1. The oil sludge drying agent is characterized by comprising the following components in percentage by mass: 75-93.3% of basic preparation, 0.5-10% of demulsifier, 0-10% of deodorant and 0.2-2% of wood fiber;

wherein the basic preparation comprises the following components in percentage by mass: 92-100% of 95% ethanol and 0-8% of deionized water;

the demulsifier is any one or more of AE-type demulsifier and AR-type demulsifier;

the smell removing agent comprises the following components in percentage by mass: 25-30% of hydrogen peroxide, 60-75% of sodium hypochlorite solution and 0-10% of alkali liquor;

the diameter of the wood fiber filament is 0.02-0.1 mm, and the length of the wood fiber filament is 0.2-2 cm.

2. The oil sludge drying agent as claimed in claim 1, wherein the alkali solution is an aqueous sodium hydroxide solution, and the sodium hydroxide in the aqueous sodium hydroxide solution accounts for 85% by mass.

3. The sludge drying agent as claimed in claim 1, wherein the sludge drying agent comprises the following components in mass ratio: 90.8% of basic preparation, 5% of demulsifier, 4% of deodorant and 0.2% of wood fiber silk.

4. The sludge drying agent as claimed in claim 1, wherein the sludge drying agent comprises the following components in mass ratio: 90.5% of basic preparation, 5% of demulsifier, 4% of deodorant and 0.5% of wood fiber silk.

5. The sludge drying agent as claimed in claim 1, wherein the sludge drying agent comprises the following components in mass ratio: 90.2% of basic preparation, 5% of demulsifier, 4% of deodorant and 0.8% of wood fiber silk.

6. The sludge drying agent as claimed in claim 1, wherein the sludge drying agent comprises the following components in mass ratio: base formulation 89.9%, demulsifier 5%, deodorant 4% and wood fibre 1.1%.

7. The sludge drying agent as claimed in claim 1, wherein the sludge drying agent comprises the following components in mass ratio: base formulation 89.6%, demulsifier 5%, deodorant 4% and wood fibre 1.4%.

8. The sludge drying agent as claimed in claim 1, wherein the sludge drying agent comprises the following components in mass ratio: base formulation 89.3%, demulsifier 5%, deodorant 4% and wood fibre 1.7%.

9. The sludge drying agent as claimed in claim 1, wherein the sludge drying agent comprises the following components in mass ratio: base formulation 89%, demulsifier 5%, deodorant 4% and wood fibre 2%.

10. The sludge drying process as claimed in any one of claims 1 to 9, comprising the steps of:

s101: preparing a drying agent, weighing the basic preparation, the demulsifier, the odor removing agent and the wood fiber according to the mass ratio, mixing the basic preparation, the demulsifier, the odor removing agent and the wood fiber to prepare the drying agent, wherein the oil sludge and the drying agent are mixed according to the ratio of 1000: 1 into a stirring device;

s102: dewatering pretreatment, namely rapidly stirring at the rotating speed of 30-60 r/min for 2-8 min, then slowly stirring at two stages of 5-20 r/min for 10-30 min, and adding a flocculating agent in the slow stirring process until the oil liquid and the water are obviously layered;

s103: dehydrating oil sludge, removing oil, settling, adding a conditioning agent for conditioning, pouring the mixture into a screw stacking machine for dehydration when the pH value is 7-7.5, and discharging a plurality of sludge lumps with equal mass by the screw stacking machine;

s104: drying the oil sludge, namely extruding the sludge mass into a flat shape with the thickness of 2-4 mm, coating a viscosity reducer on the surface of the sludge mass, and putting the sludge mass into a low-temperature dryer for steam jet drying;

s105: and (3) absorbing water by the oil sludge, drying, applying water-absorbing resin on two surfaces of the dried oil sludge, and pressurizing to obtain a mud cake with the water content of less than 8%.

Background

Sludge produced by sewage treatment systems in oil refineries is called trisludge. Mainly comes from bottom mud of an oil separation tank, floating slag of an air floatation tank and residual activated sludge. In 2017, published by national records of dangerous wastes (2017 edition), it is clear that bottom sludge, gas scum and tank bottom sludge of an oil separation tank are dangerous wastes (HW-08). According to the relative requirements of the national clean production promotion law and the solid waste environmental pollution prevention and treatment law, the oily sludge must be strictly managed and harmlessly treated according to the hazardous waste.

At present, oily sludge in oil refineries is generally delivered to a hazardous waste disposal unit for disposal, and the cost is generally 3000 yuan/ton. According to the average oil sludge production of an oil refinery being 10000-20000 tons/year, the outsourcing disposal cost of the oil sludge is about 3000-6000 RMB/year, and a large burden is caused to enterprises.

The oil-bearing sludge of oil refinery is composed of heavy oil, particles and water, and its water content is 75-95%. The method has the advantages that the water in the oil sludge is removed by adopting an appropriate method, the production amount of the oil sludge is obviously reduced, and the outsourcing treatment cost is greatly reduced, so that the oil sludge reduction technology is widely researched, different oil sludge reduction systems are developed in sequence, and a separation technical scheme taking a screw stacking machine as core equipment is adopted in the prior art for dehydration, wherein coagulation sedimentation is a key unit, and PAM is the basis of a medicament formula. In order to further improve the dehydration efficiency, various research institutions and environmental protection enterprises carry out various compound researches on medicament formulas, and some new formulas can also further improve the dehydration efficiency, but the difference is generally not more than 5%. The centrifugal separation scheme is similar to the pressure filtration scheme of the screw stacking machine, the viscosity of the material is often required to be reduced due to the obvious influence of the viscosity on the centrifugal separation effect, the viscosity reduction is realized by a further medicine adding or heating method, the process is complex, and the dehydration rate cannot be obviously improved.

Disclosure of Invention

The invention aims to provide an oil sludge drying agent and an oil sludge drying process, wherein wood fiber filaments are added on the basis of the original drying agent to form a framework for attaching floccules, so that floccules are prevented from dissociating, oil-water separation is accelerated, and water is absorbed by secondary low-temperature extrusion through water-absorbent resin, so that the oil-water separation degree is improved, and the dehydration rate is improved; to solve the problems set forth in the background art described above.

In order to achieve the purpose, the invention provides the following technical scheme: an oil sludge drying agent comprises the following components in percentage by mass: 75-93.3% of basic preparation, 0.5-10% of demulsifier, 0-10% of deodorant and 0.2-2% of wood fiber;

wherein the basic preparation comprises the following components in percentage by mass: 92-100% of 95% ethanol and 0-8% of deionized water;

the demulsifier is any one or more of AE-type demulsifier and AR-type demulsifier;

the smell removing agent comprises the following components in percentage by mass: 25-30% of hydrogen peroxide, 60-75% of sodium hypochlorite solution and 0-10% of alkali liquor;

the diameter of the wood fiber filament is 0.02-0.1 mm, and the length of the wood fiber filament is 0.2-2 cm.

Further, the alkali liquor is a sodium hydroxide aqueous solution, and the sodium hydroxide in the sodium hydroxide aqueous solution accounts for 85% of the mass percentage.

Further, the paint comprises the following components in percentage by mass: 90.8% of basic preparation, 5% of demulsifier, 4% of deodorant and 0.2% of wood fiber silk.

Further, the paint comprises the following components in percentage by mass: 90.5% of basic preparation, 5% of demulsifier, 4% of deodorant and 0.5% of wood fiber silk.

Further, the paint comprises the following components in percentage by mass: 90.2% of basic preparation, 5% of demulsifier, 4% of deodorant and 0.8% of wood fiber silk.

Further, the paint comprises the following components in percentage by mass: base formulation 89.9%, demulsifier 5%, deodorant 4% and wood fibre 1.1%.

Further, the paint comprises the following components in percentage by mass: base formulation 89.6%, demulsifier 5%, deodorant 4% and wood fibre 1.4%.

Further, the paint comprises the following components in percentage by mass: base formulation 89.3%, demulsifier 5%, deodorant 4% and wood fibre 1.7%.

Further, the paint comprises the following components in percentage by mass: base formulation 89%, demulsifier 5%, deodorant 4% and wood fibre 2%.

According to another aspect of the invention, an oil sludge drying process is disclosed, which comprises the following steps:

s101: preparing a drying agent, preparing the drying agent, weighing the basic preparation, the demulsifier, the deodorant and the wood fiber yarn according to the mass ratio, mixing the basic preparation, the demulsifier, the deodorant and the wood fiber yarn to prepare the drying agent, wherein the oil sludge and the drying agent are prepared according to the weight ratio of 1000: 1 into a stirring device;

s102: dewatering pretreatment, namely rapidly stirring at the rotating speed of 30-60 r/min for 2-8 min, then slowly stirring at two stages of 5-20 r/min for 10-30 min, and adding a flocculating agent in the slow stirring process until the oil liquid and the water are obviously layered;

s103: dehydrating oil sludge, removing oil, settling, adding a conditioning agent for conditioning, pouring the mixture into a screw stacking machine for dehydration when the pH value is 7-7.5, and discharging a plurality of sludge lumps with equal mass by the screw stacking machine;

s104: drying the oil sludge, namely extruding the sludge mass into a flat shape with the thickness of 2-4 mm, coating a viscosity reducer on the surface of the sludge mass, and putting the sludge mass into a low-temperature dryer for steam jet drying;

s105: and (3) absorbing water by the oil sludge, drying, applying water-absorbing resin on two surfaces of the dried oil sludge, and pressurizing to obtain a mud cake with the water content of less than 8%.

Compared with the prior art, the invention has the beneficial effects that: according to the oil sludge drying agent and the oil sludge drying process, the wood fiber yarns with the length of 0.2-2 cm are added on the basis of the original drying agent, the wood fiber yarns enter the stirrer together with the oil sludge, impurities which are difficult to break emulsion are adsorbed on the wood fiber yarns, and after the flocculating agent is added into the oil sludge, the wood fiber yarns form a framework for attaching floccules, so that floccules are prevented from dissociating, oil-water separation is accelerated, and the oil-water separation degree is improved; the method has the advantages that pressure is applied to the formed mud cakes again after low-temperature treatment and surface viscosity reduction treatment, water contained in the mud cakes is squeezed out and is absorbed by water-absorbent resin, the water-absorbent resin can be repeatedly used, the cost is low, the working operation is simple, and in comparison with the existing oil sludge dehydration rate, the dehydration rate after the treatment of the process is up to more than 90%.

Drawings

FIG. 1 is a flow diagram of the sludge drying process of the present invention;

fig. 2 is a schematic diagram of the sludge drying process of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example one

An oil sludge drying agent comprises the following components in percentage by mass: 90.8% of basic preparation, 5% of demulsifier, 4% of deodorant and 0.2% of wood fiber silk.

Wherein the basic preparation comprises the following components in percentage by mass: 92% of 95% ethanol and 8% of deionized water; the demulsifier is an AE type demulsifier; the smell removing agent comprises the following components in percentage by mass: 25% of hydrogen peroxide, 70% of sodium hypochlorite solution and 5% of alkali liquor, wherein the alkali liquor is sodium hydroxide aqueous solution, and sodium hydroxide in the sodium hydroxide aqueous solution accounts for 85% of the mass percentage; the diameter of wood fiber silk is 0.1mm, and its length is 1cm, adds wood fiber silk on original drier basis, and this wood fiber silk gets into the mixer along with fatlute together, and the impurity that is difficult to the breakdown of emulsion adsorbs on this wood fiber silk to after adding the flocculating agent in fatlute, this wood fiber silk forms the skeleton that supplies the flocculus to adhere to, avoid the flocculus to dissociate, accelerate oil-water separation, and improve the oil-water separation degree.

Referring to fig. 1 to fig. 2, in order to better show the sludge drying process, the present embodiment provides a sludge drying process, including the following steps:

s101: preparing a drying agent, weighing the basic preparation, the demulsifier, the odor removing agent and the wood fiber according to the mass ratio, mixing the basic preparation, the demulsifier, the odor removing agent and the wood fiber to prepare the drying agent, wherein the oil sludge and the drying agent are mixed according to the ratio of 1000: 1 into a stirring device;

s102: dewatering pretreatment, namely rapidly stirring at a rotating speed of 45r/min for 6min, then slowly stirring for 25min at two stages of 12r/min, and adding a flocculating agent in the process of slow stirring until oil and water are obviously layered, wherein the flocculating agent is a mixture formed by equivalently mixing a polysaccharide microbial flocculating agent and a protein microbial flocculating agent, and the weight ratio of oil sludge to flocculating agent is 1000: 1-10, the mass ratio data adopted in this example is oil sludge: 1000 parts of flocculant: 5;

s103: oil sludge dewatering, deoiling subsides and adds the conditioner and carries out the quenching and tempering to when pH to 7 ~ 7.5, pour it into and fold the spiral shell machine dehydration, fold the spiral shell machine and discharge a plurality of mud groups of quality such as, wherein, the conditioner is the mixture that lime, modified bentonite, zeolite and modified diatomaceous earth equivalent mixture formed, according to 1000 between oil sludge and the conditioner: 5-10, the mass ratio data adopted in this example is oil sludge: 1000 parts of conditioner: 8;

s104: drying oil sludge, namely extruding a mud mass into a flat shape with the thickness of 2mm, coating a viscosity reducer on the surface of the mud mass, putting the mud mass into a low-temperature dryer for steam jet drying, wherein the usage amount of the viscosity reducer is determined according to the surface area of the extruded mud mass, and the mass ratio data adopted in the embodiment is oil sludge: viscosity reducer 1000: 4, reducing the viscosity by using the viscosity reducer;

s105: the oil sludge absorbs water, after drying, water-absorbing resin is pasted on two sides of the oil sludge and pressurized to obtain a mud cake with the water content lower than 8%, the formed mud cake is subjected to low-temperature treatment and surface viscosity reduction treatment, pressure is applied to the formed mud cake again, water contained in the mud cake is squeezed out and is adsorbed by the water-absorbing resin, the water-absorbing resin can be recycled, the cost is low, the working operation is simple, and the dehydration rate is obviously improved.

Example two

The difference between the present embodiment and the first embodiment is only that the composition of the sludge drying agent is different, and in the present embodiment, the sludge drying agent is composed of the following components in mass ratio: 90.5% of basic preparation, 5% of demulsifier, 4% of deodorant and 0.5% of wood fiber silk.

Wherein the basic preparation comprises the following components in percentage by mass: 92% of 95% ethanol and 8% of deionized water; the demulsifier is an AE type demulsifier; the smell removing agent comprises the following components in percentage by mass: 25% of hydrogen peroxide, 70% of sodium hypochlorite solution and 5% of alkali liquor, wherein the alkali liquor is sodium hydroxide aqueous solution, and sodium hydroxide in the sodium hydroxide aqueous solution accounts for 85% of the mass percentage; the diameter of the wood fiber filament is 0.1mm, and the length thereof is 1 cm.

EXAMPLE III

The difference between the present embodiment and the first embodiment is only that the composition of the sludge drying agent is different, and in the present embodiment, the sludge drying agent is composed of the following components in mass ratio: 90.2% of basic preparation, 5% of demulsifier, 4% of deodorant and 0.8% of wood fiber silk.

Wherein the basic preparation comprises the following components in percentage by mass: 92% of 95% ethanol and 8% of deionized water; the demulsifier is an AE type demulsifier; the smell removing agent comprises the following components in percentage by mass: 25% of hydrogen peroxide, 70% of sodium hypochlorite solution and 5% of alkali liquor, wherein the alkali liquor is sodium hydroxide aqueous solution, and sodium hydroxide in the sodium hydroxide aqueous solution accounts for 85% of the mass percentage; the diameter of the wood fiber filament is 0.1mm, and the length thereof is 1 cm.

Example four

The difference between the present embodiment and the first embodiment is only that the composition of the sludge drying agent is different, and in the present embodiment, the sludge drying agent is composed of the following components in mass ratio: base formulation 89.9%, demulsifier 5%, deodorant 4% and wood fibre 1.1%.

Wherein the basic preparation comprises the following components in percentage by mass: 92% of 95% ethanol and 8% of deionized water; the demulsifier is an AE type demulsifier; the smell removing agent comprises the following components in percentage by mass: 25% of hydrogen peroxide, 70% of sodium hypochlorite solution and 5% of alkali liquor, wherein the alkali liquor is sodium hydroxide aqueous solution, and sodium hydroxide in the sodium hydroxide aqueous solution accounts for 85% of the mass percentage; the diameter of the wood fiber filament is 0.1mm, and the length thereof is 1 cm.

EXAMPLE five

The difference between the present embodiment and the first embodiment is only that the composition of the sludge drying agent is different, and in the present embodiment, the sludge drying agent is composed of the following components in mass ratio: base formulation 89.6%, demulsifier 5%, deodorant 4% and wood fibre 1.4%.

Wherein the basic preparation comprises the following components in percentage by mass: 92% of 95% ethanol and 8% of deionized water; the demulsifier is an AE type demulsifier; the smell removing agent comprises the following components in percentage by mass: 25% of hydrogen peroxide, 70% of sodium hypochlorite solution and 5% of alkali liquor, wherein the alkali liquor is sodium hydroxide aqueous solution, and sodium hydroxide in the sodium hydroxide aqueous solution accounts for 85% of the mass percentage; the diameter of the wood fiber filament is 0.1mm, and the length thereof is 1 cm.

EXAMPLE six

The difference between the present embodiment and the first embodiment is only that the composition of the sludge drying agent is different, and in the present embodiment, the sludge drying agent is composed of the following components in mass ratio: base formulation 89.3%, demulsifier 5%, deodorant 4% and wood fibre 1.7%.

Wherein the basic preparation comprises the following components in percentage by mass: 92% of 95% ethanol and 8% of deionized water; the demulsifier is an AE type demulsifier; the smell removing agent comprises the following components in percentage by mass: 25% of hydrogen peroxide, 70% of sodium hypochlorite solution and 5% of alkali liquor, wherein the alkali liquor is sodium hydroxide aqueous solution, and sodium hydroxide in the sodium hydroxide aqueous solution accounts for 85% of the mass percentage; the diameter of the wood fiber filament is 0.1mm, and the length thereof is 1 cm.

EXAMPLE seven

The difference between the present embodiment and the first embodiment is only that the composition of the sludge drying agent is different, and in the present embodiment, the sludge drying agent is composed of the following components in mass ratio: base formulation 89%, demulsifier 5%, deodorant 4% and wood fibre 2%.

Wherein the basic preparation comprises the following components in percentage by mass: 92% of 95% ethanol and 8% of deionized water; the demulsifier is an AE type demulsifier; the smell removing agent comprises the following components in percentage by mass: 25% of hydrogen peroxide, 70% of sodium hypochlorite solution and 5% of alkali liquor, wherein the alkali liquor is sodium hydroxide aqueous solution, and sodium hydroxide in the sodium hydroxide aqueous solution accounts for 85% of the mass percentage; the diameter of the wood fiber filament is 0.1mm, and the length thereof is 1 cm.

Example eight

The difference between the embodiment and the first embodiment is only that the sludge mass extrusion thickness in the sludge drying process is different, and the sludge drying process in the embodiment includes the following steps:

s101: preparing a drying agent, weighing the basic preparation, the demulsifier, the odor removing agent and the wood fiber according to the mass ratio, mixing the basic preparation, the demulsifier, the odor removing agent and the wood fiber to prepare the drying agent, wherein the oil sludge and the drying agent are mixed according to the ratio of 1000: 1 into a stirring device;

s102: dewatering pretreatment, namely rapidly stirring at a rotating speed of 45r/min for 6min, then slowly stirring for 25min at two stages of 12r/min, and adding a flocculating agent in the process of slow stirring until oil and water are obviously layered, wherein the flocculating agent is a mixture formed by equivalently mixing a polysaccharide microbial flocculating agent and a protein microbial flocculating agent, and the weight ratio of oil sludge to flocculating agent is 1000: 1-10, the mass ratio data adopted in this example is oil sludge: 1000 parts of flocculant: 5;

s103: oil sludge dewatering, deoiling subsides and adds the conditioner and carries out the quenching and tempering to when pH to 7 ~ 7.5, pour it into and fold the spiral shell machine dehydration, fold the spiral shell machine and discharge a plurality of mud groups of quality such as, wherein, the conditioner is the mixture that lime, modified bentonite, zeolite and modified diatomaceous earth equivalent mixture formed, according to 1000 between oil sludge and the conditioner: 5-10, the mass ratio data adopted in this example is oil sludge: 1000 parts of conditioner: 8;

s104: drying oil sludge, namely extruding a mud mass into a flat shape with the thickness of 3mm, coating a viscosity reducer on the surface of the mud mass, putting the mud mass into a low-temperature dryer for steam jet drying, wherein the usage amount of the viscosity reducer is determined according to the surface area of the extruded mud mass, and the mass ratio data adopted in the embodiment is oil sludge: viscosity reducer 1000: 3, reducing the viscosity by using the viscosity reducer;

s105: the oil sludge absorbs water, after drying, water-absorbing resin is pasted on two sides of the oil sludge and pressurized to obtain a mud cake with the water content lower than 8%, the formed mud cake is subjected to low-temperature treatment and surface viscosity reduction treatment, pressure is applied to the formed mud cake again, water contained in the mud cake is squeezed out and is adsorbed by the water-absorbing resin, the water-absorbing resin can be recycled, the cost is low, the working operation is simple, and the dehydration rate is obviously improved.

Example nine

The difference between the embodiment and the first embodiment is only that the sludge mass extrusion thickness in the sludge drying process is different, and the sludge drying process in the embodiment includes the following steps:

s101: preparing a drying agent, weighing the basic preparation, the demulsifier, the odor removing agent and the wood fiber according to the mass ratio, mixing the basic preparation, the demulsifier, the odor removing agent and the wood fiber to prepare the drying agent, wherein the oil sludge and the drying agent are mixed according to the ratio of 1000: 1 into a stirring device;

s102: dewatering pretreatment, namely rapidly stirring at a rotating speed of 45r/min for 6min, then slowly stirring for 25min at two stages of 12r/min, and adding a flocculating agent in the process of slow stirring until oil and water are obviously layered, wherein the flocculating agent is a mixture formed by equivalently mixing a polysaccharide microbial flocculating agent and a protein microbial flocculating agent, and the weight ratio of oil sludge to flocculating agent is 1000: 1-10, the mass ratio data adopted in this example is oil sludge: 1000 parts of flocculant: 5;

s103: oil sludge dewatering, deoiling subsides and adds the conditioner and carries out the quenching and tempering to when pH to 7 ~ 7.5, pour it into and fold the spiral shell machine dehydration, fold the spiral shell machine and discharge a plurality of mud groups of quality such as, wherein, the conditioner is the mixture that lime, modified bentonite, zeolite and modified diatomaceous earth equivalent mixture formed, according to 1000 between oil sludge and the conditioner: 5-10, the mass ratio data adopted in this example is oil sludge: 1000 parts of conditioner: 8;

s104: drying oil sludge, namely extruding a mud mass into a flat shape with the thickness of 4mm, coating a viscosity reducer on the surface of the mud mass, putting the mud mass into a low-temperature dryer for steam jet drying, wherein the usage amount of the viscosity reducer is determined according to the surface area of the extruded mud mass, and the mass ratio data adopted in the embodiment is that the oil sludge: viscosity reducer 1000: 2, reducing the viscosity by using the viscosity reducer;

s105: the oil sludge absorbs water, after drying, water-absorbing resin is pasted on two sides of the oil sludge and pressurized to obtain a mud cake with the water content lower than 8%, the formed mud cake is subjected to low-temperature treatment and surface viscosity reduction treatment, pressure is applied to the formed mud cake again, water contained in the mud cake is squeezed out and is adsorbed by the water-absorbing resin, the water-absorbing resin can be recycled, the cost is low, the working operation is simple, and the dehydration rate is obviously improved.

Comparative example 1

The difference between the present embodiment and the first embodiment is only that the composition of the sludge drying agent is different, and in the present embodiment, the sludge drying agent is composed of the following components in mass ratio: 91% of basic preparation, 5% of demulsifier, 4% of deodorant and 0% of wood fiber;

wherein the basic preparation comprises the following components in percentage by mass: 92% of 95% ethanol and 8% of deionized water; the demulsifier is an AE type demulsifier; the smell removing agent comprises the following components in percentage by mass: 25% of hydrogen peroxide, 70% of sodium hypochlorite solution and 5% of alkali liquor, wherein the alkali liquor is sodium hydroxide aqueous solution, and sodium hydroxide in the sodium hydroxide aqueous solution accounts for 85% of the mass percentage; the diameter of the wood fiber filament is 0.1mm, and the length thereof is 1 cm.

Comparative example No. two

The difference between the embodiment and the first embodiment is only that the sludge drying process is different, and the sludge drying process in the embodiment includes the following steps:

s101: preparing a drying agent, weighing the basic preparation, the demulsifier, the odor removing agent and the wood fiber according to the mass ratio, mixing the basic preparation, the demulsifier, the odor removing agent and the wood fiber to prepare the drying agent, wherein the oil sludge and the drying agent are mixed according to the ratio of 1000: 1 into a stirring device;

s102: dewatering pretreatment, namely rapidly stirring at a rotating speed of 45r/min for 6min, then slowly stirring for 25min at two stages of 12r/min, and adding a flocculating agent in the process of slow stirring until oil and water are obviously layered, wherein the flocculating agent is a mixture formed by equivalently mixing a polysaccharide microbial flocculating agent and a protein microbial flocculating agent, and the weight ratio of oil sludge to flocculating agent is 1000: 1-10, the mass ratio data adopted in this example is oil sludge: 1000 parts of flocculant: 5;

s103: oil sludge dewatering, deoiling subsides and adds the conditioner and carries out the quenching and tempering to when pH to 7 ~ 7.5, pour it into and fold the spiral shell machine dehydration, fold the spiral shell machine and discharge a plurality of mud groups of quality such as, wherein, the conditioner is the mixture that lime, modified bentonite, zeolite and modified diatomaceous earth equivalent mixture formed, according to 1000 between oil sludge and the conditioner: 5-10, the mass ratio data adopted in this example is oil sludge: 1000 parts of conditioner: 8.

taking 11 tons of oily sludge from the same oil refinery, wherein the oily sludge consists of heavy oil, particles and water, the water content of the oily sludge is between 75 and 95 percent, the components and the proportion of the components of the 11 tons of oily sludge are detected to be the same, the water content of the oily sludge is also the same, the 11 tons of oily sludge are divided into 11 groups to be supplied to 11 test groups including a first test group, a second test group and a first comparative test group, the corresponding oily sludge drying process operation is carried out, the mass data of the components added in each example and each comparative test group in the operation process are counted, and the statistical data are shown in the following table 1:

TABLE 1 statistics of additive component quality data for each test group

According to the statistics, in the first to seventh examples, only the contents of the basic preparation and the lignocellulose filaments are different, in the first to seventh examples, the addition amount of the lignocellulose filaments is respectively 0.2kg, 0.5kg, 0.8kg, 1.1kg, 1.4kg, 1.7kg and 2.0kg, in the first to eighth examples and ninth examples, only the thickness of the mud mass and the content of the viscosity reducer are different, in the first to eighth examples and ninth examples, the thickness of the mud mass is respectively 2mm, 3mm and 4mm, and under the condition that the mass of the mud mass is not changed, the thicker the mud mass is, the smaller the spread area of the mud mass is, and the less the viscosity reducer is required to be coated; the first comparative example is compared to the first example, in which no lignocellulosic fiber is added, and the second comparative example is compared to the first example, in which no further treatment of the mud cake is performed.

The dehydrated sludge treated by the above examples and comparative examples was examined to obtain the water content and oil content data in the sludge, which are shown in the following table 2:

TABLE 2 statistics of water content and oil content data after sludge dewatering for each test group

Wherein, the dehydration rate is (the weight of the oil sludge before dehydration-the weight of the oil sludge after dehydration)/the weight of the oil sludge before dehydration) X100 percent, and the oil content is (the oil content/the total amount of the mud cakes) X100 percent; the water content is (water content/total mud cake) X100%; the calculation shows that the oil sludge drying agent consists of the following components in percentage by mass: when the basic preparation is 89.6%, the demulsifier is 5%, the deodorant is 4% and the wood fiber is 1.4%, the water content of the dewatered mud cake is as low as 6.55%, and compared with the comparative example I, the embodiment added with the wood fiber is higher in dewatering rate than the comparative example I without the wood fiber, and comparing the embodiment I, the embodiment VII and the embodiment eight with the comparative example II, the dewatering rate can be obviously improved through drying of the oil sludge and water absorption of the oil sludge, the dewatering rate can reach more than 85%, and the dewatering rate can be improved to more than 94% by matching with the five drying agents in the embodiment.

In summary, the following steps: according to the oil sludge drying agent and the oil sludge drying process, the wood fiber yarns with the length of 0.2-2 cm are added on the basis of the original drying agent, the wood fiber yarns enter the stirrer together with the oil sludge, impurities which are difficult to break emulsion are adsorbed on the wood fiber yarns, and after the flocculating agent is added into the oil sludge, the wood fiber yarns form a framework for attaching floccules, so that floccules are prevented from dissociating, oil-water separation is accelerated, and the oil-water separation degree is improved; the method has the advantages that pressure is applied to the formed mud cakes again after low-temperature treatment and surface viscosity reduction treatment, water contained in the mud cakes is squeezed out and is absorbed by water-absorbent resin, the water-absorbent resin can be repeatedly used, the cost is low, the working operation is simple, and in comparison with the existing oil sludge dehydration rate, the dehydration rate after the treatment of the process is up to more than 90%.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical solutions and the inventive concepts of the present invention within the technical scope of the present invention.