1. A method for online plugging blowby of vault masonry of a primary coke dry quenching dust remover is characterized by comprising the following steps:

a. production condition adjustment of dry quenching furnace

Keeping the normal material level of the dry quenching furnace, filling nitrogen, and reducing combustible components H in a circulating gas system of the dry quenching furnace₂Adjusting the CO content and the air volume of the circulating gas to be half of the normal air volume, and carrying out heat preservation and pressure maintaining treatment on the system; monitoring H in circulating gas at the moment of dry quenching main control chamber₂The concentration of combustible CO components is ensured to be controlled within a range with minimum risk;

b. maintenance construction machine preparation

Portable O₂An alarm, a portable CO alarm, and a low-pressure blower safety device; heat preservation particles, ceramic fiber blankets and mullite fire clay are used for plugging the blowby material; a cutting machine, an electric welding machine and corresponding welding line and welding rod construction tools;

c. portable O for constructors₂An alarm and a portable CO alarm, wherein a low-pressure blower is arranged at a cutting hole at the upper part of the vault of the coke dry quenching primary dust remover for blowing air, so that H around a construction site is reduced₂The concentration of combustible CO components; cutting a vault furnace shell steel plate of the dry quenching primary dust remover by using a cutting machine, wherein the hole opening part is positioned in the middle of the vault structure;

d. cleaning the heat preservation particle filler on the top of the primary dust remover, removing the heat insulation bricks on the top of the furnace, exposing the refractory bricks on the working layer of the furnace top, filling and compacting a larger gap at the arch top by adopting a ceramic fiber blanket, and then performing grouting treatment; directly adopting grouting treatment for small gaps at the arch crown;

e. and after grouting is finished, building the heat insulation brick, fully paving 1 layer of ceramic fiber blanket with the thickness of 50mm on the surface of the heat insulation brick, filling heat insulation particles, and finally welding a steel plate.

2. The method of online plugging blowby of dry quenching primary precipitator vault masonry of claim 1 wherein said minimum hazard range is H₂The content of CO is controlled below 3%, and the content of CO is controlled below 6%.

3. The method of online plugging blowby of dry quenching primary precipitator vault masonry of claim 1 wherein the size of the openings is 800 x 1500 mm.

4. The method for online plugging blowby of vault masonry of a coke dry quenching primary dust collector of claim 1, wherein the grouting treatment is performed in two steps, the grouted refractory mortar is prepared by mullite mortar with the addition of industrial phosphoric acid with the concentration of 85% and water, the first time, the density of the grouted refractory mortar is 1.3g/cm³(ii) a The density of the slurry adopted for the second time is 1.7g/cm³。

Background

In recent years, with the development of society and higher requirements on environmental protection and energy, dry quenching devices are adopted by more and more steel mills in China. When the vault masonry of the primary coke dry quenching dust remover is newly built, the mortar joint is possibly too large and the mortar is not full; or the air flow scours excessively during the production process, so that the vault masonry has a through seam, the sealing is poor, and the local temperature of the vault shell of the dust remover is overhigh and reddish after a period of dry quenching production. Aiming at the phenomenon, a mode of covering a heat insulation castable material on a primary dust remover vault shell or a mode of bricking the primary dust remover vault masonry after a furnace is shut down and the primary dust remover vault masonry is dismantled is adopted. The first method described above causes the primary precipitator dome shell steel sheet to be burnt and deformed; the other method has the disadvantages of large dismantling workload, high maintenance cost, long construction period and serious influence on production.

The known methods of repairing the dome shell of a primary precipitator therefore suffer from the inconveniences and problems described above.

Disclosure of Invention

The invention aims to provide a safe and reliable method for online blocking blowby of vault masonry of a primary coke dry quenching dust remover.

In order to achieve the purpose, the technical solution of the invention is as follows:

a method for online plugging blowby of vault masonry of a primary coke dry quenching dust remover is characterized by comprising the following steps:

a. production condition adjustment of dry quenching furnace

Keeping the normal material level of the dry quenching furnace, filling nitrogen, and reducing combustible components H in a circulating gas system of the dry quenching furnace₂Adjusting the CO content and the air volume of the circulating gas to be half of the normal air volume, and carrying out heat preservation and pressure maintaining treatment on the system; monitoring H in circulating gas at the moment of dry quenching main control chamber₂The concentration of combustible CO components is ensured to be controlled within a range with minimum risk;

b. maintenance construction machine preparation

Portable O₂An alarm, a portable CO alarm, and a low-pressure blower safety device; heat preservation particles, ceramic fiber blankets and mullite fire clay are used for plugging the blowby material; a cutting machine, an electric welding machine and corresponding welding line and welding rod construction tools;

c. portable O for constructors₂An alarm and a portable CO alarm, wherein a low-pressure blower is arranged at a cutting hole at the upper part of the vault of the coke dry quenching primary dust remover for blowing air, so that H around a construction site is reduced₂The concentration of combustible CO components;cutting a vault furnace shell steel plate of the dry quenching primary dust remover by using a cutting machine, wherein the hole opening part is positioned in the middle of the vault structure;

d. cleaning the heat preservation particle filler on the top of the primary dust remover, removing the heat insulation bricks on the top of the furnace, exposing the refractory bricks on the working layer of the furnace top, filling and compacting a larger gap at the arch top by adopting a ceramic fiber blanket, and then performing grouting treatment; directly adopting grouting treatment for small gaps at the arch crown;

e. and after grouting is finished, building the heat insulation brick, fully paving 1 layer of ceramic fiber blanket with the thickness of 50mm on the surface of the heat insulation brick, filling heat insulation particles, and finally welding a steel plate.

The method for online plugging the blow-by of the vault masonry of the coke dry quenching primary dust remover can be further realized by adopting the following technical measures.

The method as described above, wherein the minimum risk range is H₂The content of CO is controlled below 3%, and the content of CO is controlled below 6%.

The method of the preceding, wherein the size of the opening is 800 x 1500 mm.

In the method, the grouting treatment is carried out in two times, the grouting refractory slurry is prepared by adding 10 percent of industrial phosphoric acid with the concentration of 85 percent of mullite fire clay and water, and the first time is the refractory slurry with the density of 1.3g/cm³(ii) a The density of the slurry adopted for the second time is 1.7g/cm³。

After the technical scheme is adopted, the method for online plugging the blow-by of the vault masonry of the primary coke dry quenching dust remover has the following advantages:

1. the maintenance time is shortened;

2. the engineering quality is safe and reliable, and the production efficiency of the dry quenching furnace is improved;

3. the maintenance cost is reduced, and the manufacturing resources of the social refractory materials are saved.

Drawings

FIG. 1 is a schematic structural diagram of a primary dust collector in an embodiment of the present invention.

Detailed Description

The present invention will be further described with reference to the following examples and the accompanying drawings.

Example 1

The invention discloses a method for online plugging blowby of vault masonry of a primary coke dry quenching dust remover, which comprises the following process flows:

adjusting the production condition of a dry quenching furnace → preparing a maintenance construction machine → cutting a steel plate of a vault furnace shell of a dust remover → completely cleaning filler in the vault → dismantling partial heat insulation bricks → filling large seams at the vault → grouting treatment → building heat insulation bricks → filling heat preservation particles → welding the vault steel plate furnace shell → recovering the normal production condition.

FIG. 1 is a schematic structural diagram of a primary dust collector in an embodiment of the present invention. The method for online plugging the blow-by of the vault masonry of the primary coke dry quenching dust remover comprises the following steps:

1. production condition adjustment of dry quenching furnace

The dry quenching furnace is kept at a normal material level, and a method of filling nitrogen is adopted firstly to reduce combustible components H in a circulating gas system of the dry quenching furnace₂And regulating the air quantity of the circulating gas to about half of the normal air quantity according to the CO content, and carrying out heat preservation and pressure maintaining treatment on the system. Monitoring H in circulating gas at the moment of dry quenching main control chamber₂The concentration of combustible components such as CO is surely controlled within a predetermined minimum risk range, and generally H₂The content of CO is controlled below 3%, and the content of CO is controlled below 6%.

2. Maintenance construction machine preparation

Portable O₂Safety equipment such as an alarm, a portable CO alarm, a low-pressure blower and the like; plugging blowby materials such as heat-insulating particles, ceramic fiber blankets, mullite bricks 5, fire clay and the like; a cutting machine, an electric welding machine and corresponding construction materials such as a welding line, a welding rod and the like.

3. The specific construction measures of online plugging are as follows:

1) portable O for constructors₂Alarm and be equipped with portable CO alarm. A low-pressure blower is arranged at the cutting hole for blowing air, so that H around the construction site is reduced₂And the concentration of combustible components such as CO. The furnace shell steel plate 6 is cut by a cutting machine, the position of an opening 7 is mainly in the middle of the arch structure, and the size of the opening is 800 multiplied by 1500 mm.

2) Cleaning the heat preservation particles 3 at the top of the primary dust remover, removing the heat insulation bricks 4 at the furnace top part of the leakage point 2 of the vault masonry 1, exposing the refractory bricks at the working layer of the furnace top, filling and compacting a larger gap at the vault by adopting a ceramic fiber blanket, and then performing grouting treatment; and directly adopting grouting treatment for the small gap at the arch crown.

3) The grouting treatment is carried out twice. The fire-resistant slurry for grouting is prepared by adding 10 percent of industrial phosphoric acid (with the concentration of 85 percent) and water into mullite fire-resistant slurry, and the density of the fire-resistant slurry adopted for the first time is lower and is about 1.3g/cm³(ii) a The second time using a slurry density of about 1.7g/cm³。

4) And after grouting is finished, building heat insulation bricks, paving 1 layer of ceramic fiber blanket with the thickness of 50mm on the surface of the heat insulation bricks, filling heat insulation particles, and finally welding steel plates.

The method for online plugging the blowby of the vault masonry of the primary coke dry quenching dust remover has the advantages that the basic parameters of the coke dry quenching production are properly adjusted under the condition that the coke dry quenching production is not influenced, the technical measures are adopted at the top of the primary coke dry quenching dust remover to plug the blowby point of the vault masonry, and the problems of high temperature and redness of the vault steel plate of the primary coke dry quenching dust remover are solved. The method shortens the maintenance time, improves the production efficiency of the dry quenching furnace, and has important significance in reducing the maintenance cost, saving the manufacturing resources of the social refractory materials and the like.

The method for online plugging blowby of vault masonry of the coke dry quenching primary dust remover disclosed by the invention is applied to maintenance engineering of a coke dry quenching furnace of a Pan steel coking company, has an obvious effect and is determined by relevant departments and units.

The above embodiments are provided only for illustrating the present invention and not for limiting the present invention, and those skilled in the art can make various changes or modifications without departing from the spirit and scope of the present invention. Accordingly, all equivalents are intended to fall within the scope of the invention, which is defined in the claims.