1. A steam source system based on a steam-liquid ejector supercharging flash technology comprises a steam-liquid ejector (1), a heater (2), a flash tank (3) and a water replenishing pump (4), wherein all devices are connected through pipelines; the vapor-liquid ejector is formed by sequentially connecting a scaling type working nozzle (5), a suction chamber (6), a mixing chamber (7) and a diffusion chamber (8), a high-pressure vapor inlet is connected with an inlet of the working nozzle (5), an injection fluid inlet of the suction chamber (6) is connected with the bottom of a flash tank (3), and an outlet of the diffusion chamber (8) is connected with a cold fluid inlet of a heater (2); the method is characterized in that: the steam source system is driven by high-pressure working steam, supersonic jet flow is generated at an outlet of the working nozzle (5), vacuum is formed in the suction chamber (6), low-pressure water sucked into the flash tank (3) enters the steam-liquid ejector (1), steam-liquid mixing and condensation boosting are completed in the mixing chamber (7), mixed fluid continues boosting in the diffusion chamber (8), the mixed fluid is sent into the heater (2) to be heated into saturated or nearly saturated fluid, and the mixed fluid enters the flash tank (3) to be flashed, so that low-pressure saturated steam is generated; the low-pressure saturated water which is not flashed is collected at the bottom of the flash tank (3) and is communicated with an injection inlet of the vapor-liquid ejector (1) through an outlet pipe at the bottom of the flash tank (3), so that cyclic pressurization flash evaporation is realized; and the water replenishing pump (4) is used for delivering the low-temperature water to the bottom of the flash tank (3) so as to ensure the continuous and stable operation of the steam source system.

2. The vapor source system based on the vapor-liquid ejector supercharging flash technology according to claim 1, characterized in that: the heater (2) in the steam source system adopts the waste heat of the tail flue gas of the steam boiler (9) as a heating source, and the specific form of the heater is a split type heat pipe heater, a heat conducting oil heater or a flue gas heater.

3. The vapor source system based on the vapor-liquid ejector supercharging flash technology according to the claims 1 and 2, characterized in that: when the heater (2) in the steam source system is in the form of a split type heat pipe heater, the heater (2) and the split type heat pipe evaporator (10) form a closed loop, the split type heat pipe evaporator (10) is arranged in a flue at the tail of the steam boiler (9) to absorb the waste heat of flue gas, and the heater (2) of the steam source system releases heat by condensing a heat pipe working medium.

4. The vapor source system based on the vapor-liquid ejector supercharging flash technology according to the claims 1 and 2, characterized in that: when the heater (2) in the steam source system is a heat-conducting oil heater, the heater (2) and the heat-conducting oil collector (11) form a closed loop, the heat-conducting oil collector (11) is arranged in a flue at the tail of the steam boiler (9) to absorb the waste heat of flue gas, and the heater (2) takes heat-conducting oil as a heating source.

5. The vapor source system based on the vapor-liquid ejector supercharging flash technology according to the claims 1 and 2, characterized in that: when the heater (2) in the steam source system is in the form of a flue gas heater, the heater (2) is arranged in a flue at the tail part of the steam boiler (9) to directly absorb the waste heat of the flue gas.

Background

The oil exploitation in China already enters a thick oil thermal exploitation stage, the thick oil thermal exploitation needs to consume a large amount of steam and fresh water, and a steam source system which can supply medium and low pressure steam to large and medium-sized multi-effect evaporation or multi-stage flash evaporation and other thermal seawater desalination or sewage treatment devices is important auxiliary equipment for the thick oil thermal exploitation.

The steam injection boiler for heavy oil thermal recovery generally takes crude oil, diesel oil and natural gas as fuels, generates high-temperature and high-pressure saturated steam or superheated steam of 10-21MPa, injects the high-temperature and high-pressure saturated steam or superheated steam into an oil well, heats the crude oil in an oil layer to reduce the viscosity of the heavy oil so as to greatly improve the recovery ratio of the heavy oil, and the evaporation capacity generally reaches 18t/h or more. If the high-temperature high-pressure steam generated by the steam injection boiler is directly used for seawater desalination or a sewage treatment device after temperature reduction and pressure reduction, high-quality fresh water is produced for the steam injection boiler, the energy loss is large, and the water-making economy is not high.

In addition, the exhaust gas temperature of the small-sized steam boiler is higher, generally 140-270 ℃, the waste heat recovery value is higher, but the exhaust gas quantity is smaller, the waste heat dispersion recovery cost is higher, and a universal technology with higher heat economy does not exist. If the tail flue gas waste heat of the small-sized steam boiler is used for hot method seawater desalination or a sewage treatment device to produce high-quality boiler water supplement, the water supplement quality of the boiler can be greatly improved, the scaling and blocking risks of the boiler are reduced, the heat efficiency and the service life of the boiler are obviously improved, the energy utilization efficiency of fossil fuels is improved, the water making cost of hot method seawater desalination or sewage treatment is greatly reduced, obvious economic benefits and environmental benefits are brought, and the energy development strategy of 'carbon peak reaching and carbon neutralization' is realized as early as possible in China.

To this end, the patent is provided, namely a steam source system based on a steam-liquid ejector supercharging flash technology.

Disclosure of Invention

The invention aims to provide a vapor source system based on a vapor-liquid ejector supercharging flash technology. Aiming at the problems that high-temperature high-pressure steam generated by a thick oil thermal recovery steam injection boiler is directly used for a multi-effect evaporation or multi-stage flash evaporation and other thermal seawater desalination or sewage treatment processes after temperature reduction and pressure reduction, the energy loss is large, and the water production economy is not high, the high-pressure steam is adopted to drive a steam-liquid ejector, low-pressure water in a flash evaporation tank is sucked, the pressure and the temperature are improved, then the low-pressure water is sent into a heater to be further heated to a saturated or nearly saturated state, multiple times of low-pressure steam is flashed in the flash evaporation tank, and the thermal economy of a low-pressure steam utilization process is improved. The heater of the steam source system can adopt the tail flue gas of the boiler as a heat source, and the waste heat utilization of the flue gas of the boiler is realized in the forms of a split type heat pipe heater, a heat conduction oil heater or a flue gas heater and the like, so that the energy utilization efficiency of the boiler is improved; when the low-pressure steam-using process is multi-effect evaporation or multi-stage flash evaporation and other thermal methods for seawater desalination or sewage treatment, the low-pressure water supplement of the flash tank can come from fresh water produced by a thermal method water treatment device.

The technical scheme adopted by the invention is as follows: a steam source system based on a steam-liquid ejector supercharging flash technology comprises a steam-liquid ejector, a heater, a flash tank and a water replenishing pump, wherein all devices are connected through pipelines; the vapor-liquid ejector is formed by sequentially connecting a scaling type working nozzle, a suction chamber, a mixing chamber and a diffusion chamber, a high-pressure vapor inlet is connected with an inlet of the working nozzle, an injection fluid inlet of the suction chamber is connected with the bottom of the flash tank, and an outlet of the diffusion chamber is connected with a cold fluid inlet of the heater; the steam source system is driven by high-pressure working steam, supersonic jet flow is generated at an outlet of the working nozzle, vacuum is formed in the suction chamber, low-pressure water sucked from the flash tank enters the steam-liquid ejector, steam-liquid mixing, condensation and pressure boosting are completed in the mixing chamber, the mixed fluid is continuously boosted in the diffusion chamber, and is sent to the heater to be heated to be saturated or nearly saturated fluid, and the saturated fluid enters the flash tank for flash evaporation, so that low-pressure saturated steam is generated; collecting the low-pressure saturated water which is not flashed at the bottom of the flash tank, and communicating the low-pressure saturated water with an injection inlet of a gas-liquid ejector through an outlet pipe at the bottom of the flash tank to realize circulating pressurization flash; the water replenishing pump sends low-temperature water to the bottom of the flash tank, so that the continuous and stable operation of the steam source system is ensured;

the heater of the steam source system can adopt the waste heat of the tail flue gas of the steam boiler as a heating source, the specific form of the heater can be a split type heat pipe heater, a heat conducting oil heater or a flue gas heater, and the adopted technical scheme is as follows: when the heater is a split type heat pipe heater, the heater and the split type heat pipe evaporator form a closed loop, the split type heat pipe evaporator is arranged in a tail flue of the steam boiler to absorb the waste heat of the flue gas, the heat pipe working medium enters the heater after being evaporated to release latent heat of condensation to heat the boosted water at the outlet of the vapor-liquid ejector, and the heat pipe working medium is condensed into a liquid state and then flows back to the split type heat pipe evaporator to circularly absorb the waste heat of the flue gas; when the heater is a heat-conducting oil heater, the heater and the heat-conducting oil collector form a closed loop, the heat-conducting oil collector is arranged in a tail flue of the steam boiler to absorb the waste heat of the flue gas, the heat-conducting oil enters the heater after being heated to heat the boosting water at the outlet of the steam-liquid ejector, the heat-conducting oil returns to the heat-conducting oil collector after being cooled, and the waste heat of the flue gas is circularly absorbed; when the heater is a flue gas heater, the heater is directly arranged in a tail flue of the steam boiler to absorb the waste heat of the flue gas, and the pressure boosting water at the outlet of the steam-liquid ejector is sent to the heater through the connecting pipeline to absorb the waste heat of the flue gas and then sent to the flash tank through the connecting pipeline for flash evaporation.

The steam source system can supply steam for the multi-effect evaporation or multi-stage flash evaporation and other thermal seawater desalination or sewage treatment devices, and the water supplement of the steam source system can be product water of the thermal seawater treatment devices and is pumped to the bottom of the flash tank after being pressurized by the water supplement pump, so that the continuous and stable operation of the steam source system is ensured.

The invention has the beneficial effects that: the low-pressure water in the flash tank is pumped by a small part of high-pressure steam by using a steam-liquid ejector, and the low-pressure water is heated and pressurized and then sent into the flash tank to be flashed to obtain multiple times of low-pressure saturated steam, so that the heat economy of a low-pressure steam using process is improved; meanwhile, the heater of the steam source system can utilize the waste heat of the flue gas at the tail part of the steam boiler in various ways, so that the energy utilization efficiency of the boiler is improved, and the energy conservation and emission reduction are realized; when the steam source system is used for a multi-effect evaporation or multi-stage flash evaporation equal-heat method seawater desalination or sewage treatment device, the quality of product water of the heat method water treatment device is high, the water supplementing quality of a steam boiler is greatly improved, the scaling and blocking risks of the boiler are reduced, the heat efficiency of the boiler is obviously improved, and the service life of the boiler is obviously prolonged.

Drawings

FIG. 1 is a schematic diagram of a vapor source system based on vapor-liquid ejector boost flash technology.

FIG. 2 is a schematic diagram of a steam source system based on a vapor-liquid ejector supercharging flash technology, which adopts a split type heat pipe heater to recover the waste heat of the tail flue gas of a boiler.

FIG. 3 is a schematic diagram of a steam source system based on a vapor-liquid ejector supercharging flash technology, which adopts a heat-conducting oil heater to recover the waste heat of the tail flue gas of a boiler.

FIG. 4 is a schematic diagram of a steam source system based on a vapor-liquid ejector supercharging flash technology, which adopts a flue gas heater to recover the flue gas waste heat at the tail of a boiler.

In the figure: 1. the system comprises a vapor-liquid ejector, 2, a heater, 3, a flash tank, 4, a water replenishing pump, 5, a working nozzle, 6, a suction chamber, 7, a mixing chamber, 8, a diffusion chamber, 9, a steam boiler, 10, a split type heat pipe evaporator, 11 and a heat conduction oil heat collector.

Detailed Description

The technical solution in the implementation of the present invention will be clearly and completely described below with reference to the accompanying drawings of the present invention.

Fig. 1 shows a vapor source system device diagram based on vapor-liquid ejector pressure boost flash technology.

The steam source system provided by the invention comprises a steam-liquid ejector 1, a heater 2, a flash tank 3 and a water replenishing pump 4, wherein all devices are connected by adopting pipelines; the steam-liquid ejector 1 consists of a scaling type working nozzle 5, a suction chamber 6, a mixing chamber 7 and a diffusion chamber 8, a high-pressure steam inlet is connected with an inlet of the working nozzle 5, an injection fluid inlet of the suction chamber 6 is connected with the bottom of the flash tank 3, and an outlet of the diffusion chamber 8 is connected with a cold fluid inlet of the heater 2. When the steam source system operates, high-pressure working steam drives the steam-liquid ejector 1 to generate supersonic jet flow at the outlet of the working nozzle 5, vacuum is formed in the suction chamber 6, low-pressure water in the suction flash tank 3 enters the steam-liquid ejector 1, steam-liquid mixing and condensation boosting are completed in the mixing chamber 7, mixed fluid continues boosting in the diffusion chamber 8, and after the mixed fluid is sent into the heater 2 and heated to be saturated or nearly saturated fluid, the mixed fluid enters the flash tank 3 to be flashed to generate low-pressure saturated steam for a low-pressure steam using process; the low-pressure saturated water which is not flashed is collected at the bottom of the flash tank 3 and is communicated with an injection inlet of the vapor-liquid ejector 1 through an outlet pipe at the bottom of the flash tank 3, so that cyclic pressurization flash evaporation is realized; and the water replenishing pump 4 pumps the low-temperature water to the bottom of the flash tank 3 after boosting the pressure of the low-temperature water, so that the continuous and stable operation of the steam source system is ensured.

FIG. 2 shows a device diagram of a steam source system based on a vapor-liquid ejector supercharging flash technology for recovering the waste heat of the tail flue gas of a boiler by adopting a split type heat pipe heater. When the steam source system is provided with the steam boiler 9, the heater 2 and the split type heat pipe evaporator 10 can form a closed loop, the split type heat pipe evaporator 10 is arranged in a tail flue of the steam boiler 9 to absorb the waste heat of the flue gas, the heat pipe working medium enters the heater 2 after being evaporated to release the latent heat of condensation to heat the pressure boosting water at the outlet of the steam-liquid ejector 1, the heat pipe working medium is condensed into a liquid state and then flows back to the split type heat pipe evaporator 10 to circularly absorb the waste heat of the flue gas.

FIG. 3 shows a device diagram of a steam source system based on a vapor-liquid ejector supercharging flash technology for recovering the waste heat of the tail flue gas of a boiler by adopting a heat-conducting oil heater. When the heater 2 adopts a heat conduction oil heating mode, the heater 2 and the heat conduction oil collector 11 form a closed loop, the heat conduction oil collector 11 is arranged in a tail flue of the steam boiler 9 to absorb the waste heat of the flue gas, the heat conduction oil enters the heater 2 after being heated, the boosting water at the outlet of the steam-liquid ejector 1 is heated, the heat conduction oil flows back to the heat conduction oil collector 11 after being cooled, and the waste heat of the flue gas is circularly absorbed.

FIG. 4 shows a device diagram of a steam source system based on a steam-liquid ejector supercharging flash technology, which adopts a flue gas heater to recover the flue gas waste heat at the tail of a boiler. The heater 2 is directly arranged in a tail flue of the steam boiler 9, and the pressure boosting water at the outlet of the steam-liquid ejector 1 is sent to the heater 2 through a connecting pipeline to absorb the waste heat of the flue gas and then sent to the flash tank 3 through the connecting pipeline to be flashed.