CN210267297U

CN210267297U - Flue gas treatment device

Info

Publication number: CN210267297U
Application number: CN201921183983.1U
Authority: CN
Inventors: 李爱华
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-07-25
Filing date: 2019-07-25
Publication date: 2020-04-07
Anticipated expiration: 2029-07-25

Abstract

The utility model provides a flue gas processing apparatus, it includes boiler, air heater, electrostatic precipitator, desulfurizing tower, still is equipped with overlapping formula heat-work conversion system, and the boiler is connected with air heater, and air heater is connected with the air heater, and the air heater is connected with overlapping formula heat-work conversion system, and overlapping formula heat-work conversion system is connected with the desulfurizing tower, is equipped with gas heater on the desulfurizing tower, and gas heater is connected with electrostatic precipitator, and electrostatic precipitator is connected with air heater. The method solves the technical problems of large water consumption, poor economic benefit, incomplete treatment of harmful substances in the flue gas, complicated equipment structure, higher cost and large occupied space of the existing flue gas treatment method. Can be widely applied to the treatment of the flue gas.

Description

Flue gas treatment device

Technical Field

The utility model relates to an energy environmental protection utilizes device, especially relates to a flue gas processing apparatus.

Background

The smoke generated by the coal-fired power plant is condensed by partial gaseous water and pollutants in the smoke due to temperature reduction in the process of exhausting the smoke into the atmosphere from a chimney opening, and fog water vapor is formed at the chimney opening and slightly changed in color due to sky background color, sky illumination, observation angle, photochemical reaction of SO3 aerosol and the like, SO that colored smoke plume is formed. Typically white, off-white or light blue. With the deepening of the environmental management work, the elimination of white smoke emitted from a chimney becomes a problem which is urgently needed to be solved by power generation enterprises.

At present, a wet desulphurization flue gas whitening treatment method is adopted for treating white smoke of a chimney, the plant power consumption rate of a desulphurization system and the water consumption of the whole desulphurization device have great influence on the operation economy of a power plant in the desulphurization process, and particularly for air cooling units built in water-deficient areas, the water consumption level of the desulphurization device determines the water consumption of the whole power plant. For western water-deficient areas in China, the water consumption level of the unit desulfurization device is one of the performance indexes of the operating marker of the power plant, and certain measures are taken to reduce the content of water vapor taken away by flue gas, so that the method plays an important role in saving water resources of the whole power plant.

In the wet desulphurization process, the desulphurization demister can not effectively remove fog drops smaller than 22 μm in the flue gas, and the atomized limestone slurry can generate a small amount of fog drops with the diameter of about 15 μm after collision, SO that the flue gas can inevitably carry gypsum slurry, gypsum slurry and SO₃The formed sulfuric acid aerosol can form PM2.5 in the atmosphere, so that the haze phenomenon is aggravated, and if gypsum rain is formed, the harmful effects on the life of surrounding residents and the life and production of power plants can be generated.

In addition, the existing flue gas treatment equipment mostly adopts two heat exchangers to exchange heat with flue gas, so that the structure is complicated, the cost is high, the occupied space is large, and a great deal of inconvenience is brought to flue gas treatment.

As shown in figure 1, the flue gas treatment device of the prior art comprises a heat exchanger I1, a heat exchanger II 5, a desulfurizing tower 2, a low-temperature water pipe 3 and a high-temperature water pipe 4, wherein two heat exchangers are arranged in the equipment, and the heat exchange effect can be ensured only by supplying a large amount of circulating water.

Disclosure of Invention

The utility model discloses to the harmful substance processing thoroughly in the current flue gas processing method water consumption is big, economic benefits is poor, the flue gas, equipment structure is loaded down with trivial details, the cost is higher, occupation space is big technical problem, provide one kind can only need a small amount of circulating water, equipment structure simple, with low costs, flue gas treatment effect good flue gas processing apparatus.

Therefore, the technical scheme of the utility model is that, a flue gas processing apparatus is equipped with boiler, desulfurizing tower, still is equipped with the cascade type heat-work conversion system, and the cascade type heat-work conversion system is connected with the desulfurizing tower, is equipped with gas heater on the desulfurizing tower.

Preferably, the flue gas treatment device is further provided with an air preheater, a fan heater and an electrostatic dust collector, the boiler is connected with the air preheater, the air preheater is connected with the fan heater, the fan heater is connected with the cascade heat-power conversion system, the flue gas heat exchanger is connected with the electrostatic dust collector, and the electrostatic dust collector is connected with the air preheater.

Preferably, be equipped with flue gas pipe I between boiler and the air heater, be equipped with flue gas pipe II between electrostatic precipitator and the air heater, be equipped with flue gas pipe III between flue gas heat exchanger and the electrostatic precipitator, be equipped with the draught fan on the flue gas pipe III, be equipped with flue gas pipe IV between flue gas heat exchanger and the desulfurizing tower top, flue gas heat exchanger and desulfurizing tower lower part are equipped with the flue gas return pipe, still be equipped with the flue gas delivery pipe on the flue gas heat exchanger, be equipped with air duct I on the air heater, be equipped with air duct II between air heater and the air heater, be equipped with air duct III between air heater and the boiler, be equipped with the air-blower.

Preferably, the air heater is connected with the overlapping type heat-work conversion system through a water supply pipe and a water return pipe, and the water supply pipe is provided with a water supply circulating pump.

Preferably, a slurry heat exchange tube I and a slurry heat exchange tube II are arranged between the overlapping thermal power conversion system and the desulfurizing tower, a slurry circulating pump is arranged on the slurry heat exchange tube I, and a spray pipe is arranged on the slurry heat exchange tube II.

Preferably, the air preheater adopts a honeycomb heat exchanger, and the flue gas heat exchanger adopts a honeycomb heat exchanger.

The utility model has the advantages that:

(1) the cascade heat exchange is carried out on the slurry by adopting the cascade heat-power conversion system, the temperature of the slurry is fully reduced, the slurry and the sprayed flue gas generate enough temperature difference, and the cooled slurry is adopted to spray the flue gas, so that fine particles and condensable particles in the flue gas can be efficiently removed, and the purification efficiency of the flue gas is improved;

(2) in the operation process of the whole system, the released heat is effectively utilized in the system, a large amount of circulating water is not required to be continuously introduced, water resources are saved, the operation cost is reduced, the flue gas purification effect is good, and the flue gas waste heat recovery efficiency and the whitening effect are greatly improved;

(3) the electrostatic dust collector is adopted to remove dust from the flue gas, so that the content of harmful substances in the flue gas is reduced, and the flue gas treatment efficiency is improved;

(4) the air preheater adopts a honeycomb heat exchanger, the flue gas heat exchanger adopts a honeycomb heat exchanger, the honeycomb heat exchanger has good sealing effect and high heat exchange efficiency, and the use efficiency of the system is greatly improved;

(5) the temperature of the flue gas in the flue gas discharge pipe is controlled to be 40-60 ℃, so that the equipment corrosion caused by the fact that the flue gas is bonded on the equipment due to too low temperature is avoided, the full utilization of heat is ensured, and the large loss of the heat is avoided;

(6) the temperature difference between the slurry sprayed after heat exchange and the flue gas in the desulfurizing tower is set to be 20-45 ℃, so that not only can enough temperature difference be provided to purify impurity particles in the flue gas, but also the heat exchange efficiency and the operation cost of the cascade heat-power conversion system can be ensured;

(7) the flue gas treatment device has the advantages of simple integral structure, small volume, small occupied area, low manufacturing cost and low operation cost, fully utilizes the heat in the flue gas, fully purifies the impurities in the flue gas and has great economic and social benefits.

Drawings

FIG. 1 is a background art schematic;

fig. 2 is a schematic structural diagram of an embodiment of the present invention.

The symbols in the drawings illustrate that:

heat exchanger No. I; 2. a desulfurizing tower; 3. a low-temperature water pipe; heat exchanger number II; 5. a high-temperature water pipe; 6. a boiler; 7. an air pipe III; 8. a flue gas pipe I; 9. an air pipe II; 10. a warm air blower; 11. an air pipe I; 12. a water supply pipe; 13. a water return pipe; 14. a flue gas pipe III; 15. a water supply circulation pump; 16. a slurry heat exchange pipe II; 17. a shower pipe; 18. a flue gas pipe IV; 19. a flue gas heat exchanger; 20. a flue gas discharge pipe; 21. a blower; 22. an air preheater; 23. a flue gas pipe II; 24. an electrostatic precipitator; 25. an induced draft fan; 26. a cascade thermal power conversion system; 27. a slurry circulating pump; 28. a slurry heat exchange tube I; 29. a desulfurizing tower; 30. and (4) returning the flue gas.

Detailed Description

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

As shown in fig. 2, a flue gas treatment device comprises a boiler 6, an air preheater 22, a fan heater 10, an electrostatic dust collector 24, a desulfurizing tower 29 and a cascade thermal power conversion system 26, wherein the cascade thermal power conversion system 26 comprises a waste water collecting tank, a waste water tank, a one-effect multi-medium heat exchanger, a two-effect multi-medium heat exchanger, a heat pump unit, a hot water tank, a clean water source and a cold sewage source, and the system refers to a CN108716771A (application date: 20180607) industrial waste water waste heat cascade thermal power conversion device and method.

Air heater 22 adopts honeycomb heat exchanger, is equipped with flue gas pipe I8 between boiler 1 and the air heater 22, is equipped with flue gas pipe II 23 between electrostatic precipitator 24 and the air heater 22, is equipped with flue gas heat exchanger 19 on the desulfurizing tower 29, and flue gas heat exchanger 19 adopts honeycomb heat exchanger, and honeycomb heat exchanger is sealed effectual, and heat exchange efficiency is high, very big improvement the availability factor of system.

A flue gas pipe III14 is arranged between the flue gas heat exchanger 19 and the electrostatic precipitator 24, an induced draft fan 25 is arranged on the flue gas pipe III14, a flue gas pipe IV18 is arranged between the top ends of the flue gas heat exchanger 19 and the desulfurizing tower 29, a flue gas return pipe 30 is arranged at the lower parts of the flue gas heat exchanger 19 and the desulfurizing tower 29, and a flue gas discharge pipe 20 is also arranged on the flue gas heat exchanger 19.

An air pipe I11 is arranged on the air heater 10, an air pipe II 9 is arranged between the air preheater 22 and the air heater 10, an air pipe III7 is also arranged between the air preheater 22 and the boiler 1, and an air blower 21 is arranged on the air pipe III 7.

The air heater 10 is connected with the overlapping type heat-work conversion system 26 through a water supply pipe 12 and a water return pipe 13, the water supply pipe 12 is provided with a water supply circulating pump 15, a slurry heat exchange pipe I28 and a slurry heat exchange pipe II16 are arranged between the overlapping type heat-work conversion system 26 and the desulfurizing tower 29, the slurry heat exchange pipe I28 is provided with a slurry circulating pump 27, and the slurry heat exchange pipe II16 is provided with a spray pipe 17.

A flue gas treatment method comprises the following specific steps:

(1) flue gas generated in the boiler 1 enters an air preheater 22, air in the atmosphere is heated by an air heater 10 and then enters the air preheater 22, the flue gas and the air exchange heat in the air preheater 22, the air after heat exchange enters the boiler 1 under the action of an air blower 21, the flue gas after heat exchange enters an electrostatic dust collector 24 for dust removal, the flue gas is subjected to dust removal by adopting the electrostatic dust collector, the content of harmful substances in the flue gas is reduced, the flue gas treatment efficiency is improved, and the flue gas after dust removal enters a flue gas heat exchanger 19 through a flue gas pipe III14 under the action of an induced draft fan 25;

(2) the slurry at the bottom end of the desulfurizing tower 29 enters the overlapping type thermal power conversion system 26 under the action of the slurry circulating pump 27, the water return pipe 13 and the water supply pipe 12 between the overlapping type thermal power conversion system 26 and the air heater 10 are water circulation pipelines, water in the water circulation pipelines exchanges heat with the slurry in the overlapping type thermal power conversion system 26 to enable the water temperature to rise, and the heated water exchanges heat with air in the air heater 10 to increase the temperature of the air;

the slurry carries out step heat transfer in overlapping formula thermal-power conversion system 26, and the slurry after the cooling gets into shower 17 through slurry heat exchange pipe II16 and sprays the flue gas in desulfurizing tower 29, carries out the step heat transfer to the slurry through adopting overlapping formula thermal-power conversion system 26, fully reduces the slurry temperature, makes the slurry and the flue gas that is sprayed produce sufficient difference in temperature, and the slurry after the cooling sprays the flue gas, can high-efficient desorption fine particles, the particulate matter that can condense in the flue gas, improves the purification efficiency of flue gas. The sprayed and purified flue gas enters the flue gas heat exchanger 19 through a flue gas pipe IV 18;

(3) in the flue gas heat exchanger 19, the flue gas generated in the step (1) and the flue gas generated in the step (2) exchange heat, after the heat exchange, the flue gas in the flue gas pipe III14 enters the desulfurizing tower 29 through the flue gas return pipe 30, and the flue gas in the flue gas pipe IV18 enters the chimney through the flue gas discharge pipe 20 and is discharged into the atmosphere.

The whole set of device simple structure, it is small, area occupied is little, low in manufacturing cost, the running cost is low, entire system is at the operation in-process, and the heat of release is effectively utilized in the inside of system, need not continuously introduce a large amount of circulating water, has practiced thrift the water resource, has reduced the running cost to flue gas purification effect is good, and the impurity in the flue gas obtains fully purifying, has improved flue gas waste heat recovery efficiency and the effect of disappearing white, has very big economy and social.

By applying the flue gas treatment method and the device, 146 ℃ of flue gas discharged from the boiler 1 enters the air preheater 22, the air preheater 22 adopts a honeycomb heat exchanger, meanwhile, 20 ℃ of air is heated to 50 ℃ through the air heater 10, the air enters the air preheater 22 to exchange heat with the 146 ℃ flue gas, the volume ratio of the air and the flue gas is controlled, 90 ℃ of flue gas and 90 ℃ of air can be obtained, the 90 ℃ of air enters the boiler 1 under the action of the air blower 25, the heat energy loss in the boiler 1 is avoided, the 90 ℃ of air is dedusted through the electrostatic precipitator 24, the dust in the 90 ℃ of air is primarily purified, the reduction of the temperature of the flue gas also plays a certain protection role on the induced draft fan 25, and the temperature of the flue gas passing through the induced draft fan 25 reaches 80 ℃.

The slurry of 45 ℃ in the desulfurizing tower is subjected to cascade heat exchange through the cascade thermal power conversion system 26 to finally obtain slurry of 20 ℃, the flue gas of 50 ℃ in the desulfurizing tower 29 is sprayed, the temperature difference is increased, the temperature of the slurry is low, the temperature of the flue gas is rapidly reduced to 30 ℃ by spraying, impurity particles in the flue gas are further purified, the purified flue gas of 30 ℃ and the flue gas of 80 ℃ discharged from the induced draft fan 25 exchange heat in the flue gas heat exchanger 19 according to a certain proportion, the obtained purified flue gas of 50 ℃ enters a chimney and is discharged to the atmosphere, and the obtained unpurified flue gas of 50 ℃ enters the desulfurizing tower 29 through the flue gas return pipe 30 to be sprayed and purified.

In a water circulation pipeline between the overlapping type thermal power conversion system 26 and the air heater 10, water with the temperature of 60 ℃ enters the air heater 10 through the water supply pipe 12, the temperature of the water is reduced to 50 ℃ after the water exchanges heat with air with the temperature of 20 ℃, the water enters the overlapping type thermal power conversion system 26 through the water return pipe 13, the heat exchange temperature of the water and the slurry is improved, and the water enters the water supply pipe 12 again to circulate under the action of the water supply circulating pump 15.

Through the process, after the flue gas in the boiler is treated by the system, the flue gas is sprayed with components close to steam condensate water through 20 ℃ slurry, so that the atmospheric environment is not polluted, and the flue gas is prevented from being bonded on equipment due to the low temperature because the flue gas emission temperature is 50 ℃, so that the equipment is prevented from being corroded.

However, the above description is only an embodiment of the present invention, and the scope of the present invention should not be limited thereto, so that the replacement of the equivalent components or the equivalent changes and modifications made according to the protection scope of the present invention should be covered by the claims of the present invention.

Claims

1. The flue gas treatment device is provided with a boiler and a desulfurizing tower and is characterized by further comprising a cascade thermal-power conversion system, wherein the cascade thermal-power conversion system is connected with the desulfurizing tower, and a flue gas heat exchanger is arranged on the desulfurizing tower.

2. The flue gas treatment device according to claim 1, wherein the flue gas treatment device is further provided with an air preheater, an electrostatic precipitator and a fan heater, the boiler is connected with the air preheater, the air preheater is connected with the fan heater, the fan heater is connected with the cascade heating power conversion system, the flue gas heat exchanger is connected with the electrostatic precipitator, and the electrostatic precipitator is connected with the air preheater.

3. The flue gas treatment device according to claim 2, wherein a flue gas pipe I is arranged between the boiler and the air preheater, a flue gas pipe II is arranged between the electrostatic precipitator and the air preheater, a flue gas pipe III is arranged between the flue gas heat exchanger and the electrostatic precipitator, an induced draft fan is arranged on the flue gas pipe III, a flue gas pipe IV is arranged between the flue gas heat exchanger and the top end of the desulfurization tower, flue gas return pipes are arranged at the lower parts of the flue gas heat exchanger and the desulfurization tower, and a flue gas discharge pipe is also arranged on the flue gas heat exchanger; be equipped with air hose I on the air heater, air heater with be equipped with air hose II between the air heater, air heater with be equipped with air hose III between the boiler, be equipped with the air-blower on the air hose III.

4. The flue gas treatment device according to claim 2, wherein the heater and the overlapped thermal power conversion system are connected by a water supply pipe and a water return pipe, and the water supply pipe is provided with a water supply circulating pump.

5. The flue gas treatment device according to claim 2, wherein a slurry heat exchange pipe I and a slurry heat exchange pipe II are arranged between the overlapping thermal power conversion system and the desulfurizing tower, a slurry circulating pump is arranged on the slurry heat exchange pipe I, and a spray pipe is arranged on the slurry heat exchange pipe II.