CN212805705U

CN212805705U - Desulfurization and denitrification slurry pool waste heat recovery system

Info

Publication number: CN212805705U
Application number: CN202021586281.0U
Authority: CN
Inventors: 左成; 张华鹏; 兰明磊; 姜鲁荣; 张立鹏
Original assignee: Yantai Houde Ruihua Energy Saving Technology Co ltd
Current assignee: Yantai Houde Ruihua Energy Saving Technology Co ltd
Priority date: 2020-08-03
Filing date: 2020-08-03
Publication date: 2021-03-26
Anticipated expiration: 2030-08-03

Abstract

The utility model relates to a SOx/NOx control thick liquid pond waste heat recovery system, belong to waste heat recovery system's field, it includes raw coal boiler, raw coal boiler intercommunication has intake pipe and outlet duct, the outlet duct intercommunication has the sack cleaner, the one end intercommunication that raw coal boiler was kept away from to the sack cleaner has the draught fan, draught fan other end intercommunication has the desulfurizing tower, the exhanst gas outlet has been seted up to the upper end of desulfurizing tower, desulfurizing tower one side is equipped with the SOx liquid pond, the SOx liquid pond communicates respectively has the thick liquid to advance pipe and thick liquid exit tube, the desulfurizing tower advances pipe and thick liquid exit tube with the thick liquid respectively and is linked together, be equipped with the heat exchanger in the SOx liquid pond, the heat exchanger intercommunication has cold water to advance pipe and hot water exit tube, hot water exit tube intercommunication has the water source heat pump, the one end intercommunication that the hot water exit tube was. The application has the effect of saving energy.

Description

Desulfurization and denitrification slurry pool waste heat recovery system

Technical Field

The application relates to the field of waste heat recovery systems, in particular to a waste heat recovery system of a desulfurization and denitrification slurry pool.

Background

At present, flue gas generated after combustion of a raw coal boiler contains a large amount of sulfides and nitrates, the sulfides and the nitrates are directly discharged into the air, and the air is polluted greatly, and the sulfides and the nitrates in the flue gas are usually removed by a desulfurizing tower and a desulfurizing slurry pool.

The current chinese patent with publication number CN204952657U discloses a single-tower double-slurry-tank desulfurization device, which comprises an absorption tower slurry tank, wherein a slurry pump is arranged at the bottom of the absorption tower slurry tank, the slurry pump is connected with an inlet of an outer-tower slurry oxidation tank through a communicating pipe, an outlet of the outer-tower slurry oxidation tank is provided with a gypsum discharge pump, the gypsum discharge pump is connected with a gypsum discharge pipeline, and an oxidation air pipeline is arranged on the outer-tower slurry oxidation tank. The utility model converts the integrated slurry pool in the tower in the prior art into the slurry pool in the tower and the slurry oxidation pool outside the tower, and separates the oxidation system of the slurry pool of the absorption tower from the absorption system, thereby avoiding the content of oxygen in the flue gas in the absorption tower, and keeping the concentration of nitrogen oxide in the flue gas constant before and after desulfurization under the same standard of 6% oxygen content; and the concentration of sulfur oxides in the desulfurized flue gas is relatively reduced, so that the desulfurization efficiency is improved.

In view of the above-mentioned related technologies, the inventor believes that when the device is used for desulfurizing flue gas generated by a raw coal boiler, slurry in a slurry tank can absorb heat in the flue gas, the temperature of the slurry can rise after the slurry absorbs the heat, the device cannot well utilize the heat, and the heat can be dissipated in the air, which can cause energy waste.

SUMMERY OF THE UTILITY MODEL

For the energy saving, this application provides a SOx/NOx control thick liquid pond waste heat recovery system.

The application provides a desulfurization and denitrification slurry pond waste heat recovery system adopts following technical scheme:

a desulfurization and denitrification slurry pool waste heat recovery system comprises a raw coal boiler, wherein the raw coal boiler is communicated with an air inlet pipe and an air outlet pipe, the air outlet pipe is communicated with a bag-type dust collector, one end of the bag-type dust collector, which is far away from the raw coal boiler, is communicated with an induced draft fan, the other end of the draught fan is communicated with a desulfurizing tower, the upper end of the desulfurizing tower is provided with a flue gas outlet, one side of the desulfurizing tower is provided with a desulfurizing slurry pool which is respectively communicated with a slurry inlet pipe and a slurry outlet pipe, the desulfurizing tower is respectively communicated with a slurry inlet pipe and a slurry outlet pipe, a heat exchanger is arranged in the desulfurizing slurry pool, the heat exchanger is communicated with a cold water inlet pipe and a hot water outlet pipe, the hot water outlet pipe is communicated with a water source heat pump, the water source heat pump is characterized in that one end, far away from the hot water outlet pipe, of the water source heat pump is communicated with a heating water supply pipe, and one end, far away from the hot water outlet pipe, of the heating water supply pipe is communicated with a heating pipe network.

By adopting the technical scheme, when the raw coal boiler is combusted, the generated flue gas can be discharged into the bag-type dust remover through the gas outlet pipe, the bag-type dust remover can filter dust in the flue gas, the flue gas after dust filtration is pumped to the desulfurizing tower by the draught fan, the desulfurizing tower is matched with the desulfurizing slurry pool to remove sulfides in the flue gas, the flue gas after sulfide removal is discharged out of the desulfurizing tower from the flue gas outlet, when the sulfides in the flue gas are removed by the slurry, the slurry can absorb heat in the flue gas, the temperature of the slurry entering the slurry pool through the slurry inlet pipe is higher, the heat exchanger in the desulfurizing slurry pool takes away the heat in the slurry, the hot water outlet pipe leads out the hot water absorbing the heat, the water source heat pump is started, the water source heat pump can exchange the heat in the hot water outlet pipe to the water in the heating water supply pipe, and the hot water continues to enter the heating pipe network, and further, the heat contained in the high-temperature slurry in the desulfurization slurry pool is effectively utilized, the energy waste is avoided, and the energy is saved.

Preferably, one end of the heating pipe network, which is far away from the heating water supply pipe, is communicated with a heating water outlet pipe, the heating water outlet pipe is communicated with the heating water supply pipe, and the water source heat pump is arranged between the heating water outlet pipe and the cold water inlet pipe.

Through adopting above-mentioned technical scheme, the hot water flows through after the heating pipe network temperature reduces, the water after the cooling flows from the heating installation outlet pipe, start the water source heat pump, the water heat transfer again in the heating pipe network of water source heat pump after to the cooling, by the water in the thermal cold water admission pipe of absorption, accessible cold water advances tub circulation and gets into and continue the heat transfer in the heat exchanger, after the water absorption heat of heating installation delivery pipe, for the user heating again, the cyclic utilization of cooling water has been realized, the waste of water resource has been avoided.

Preferably, the raw coal boiler is connected in series with an SCR denitration device, and the SCR denitration device is connected in series with an air compressor.

Through adopting above-mentioned technical scheme, the SCR of raw coal boiler series connection is taken off the round pin device, and the SCR takes off the round pin device and can avoid producing a large amount of nitride in the raw coal boiler, and the air compressor machine provides compressed air for the SCR takes off the round pin device.

Preferably, an air preheater is communicated between the bag-type dust collector and the raw coal boiler, the air preheater is communicated with a cold air inlet pipe, the air preheater is communicated with a hot air outlet pipe, one end, far away from the air preheater, of the hot air outlet pipe is connected with a blower, and one end, far away from the air preheater, of the blower is communicated with the raw coal boiler.

Through adopting above-mentioned technical scheme, air heater can utilize the heat in the flue gas, heats the cold air that advances the pipe from cold wind and come in, and air heater self heating is hot-air in coordination with the flue gas heating, with the cold air heating, starts the air-blower, and the air-blower is with the hot-air drum go into in the raw coal boiler, can promote the burning of coal in the raw coal boiler.

Preferably, the air preheater is connected with an economizer in parallel.

By adopting the technical scheme, the economizer can absorb the medium heat of the raw coal boiler, assist the air preheater to preheat cold air, and can absorb the heat in high-temperature flue gas.

Preferably, a flue gas outlet at the upper end of the desulfurizing tower is communicated with a chimney.

By adopting the technical scheme, the stack can discharge the desulfurized flue gas, and the pollution of the flue gas to the environment can be reduced.

Preferably, the upper end of the chimney is provided with a rain cover, the lower end of the rain cover is provided with at least three connecting columns, and the rain cover is connected with the chimney through the connecting columns.

Through adopting above-mentioned technical scheme, the chimney upper end sets up rain-proof lid, and rain-proof lid can prevent that the rainwater from pouring into the chimney backward, and the spliced pole links together rain-proof lid and chimney.

Preferably, the upper end of the chimney is provided with at least three vertical mounting columns, and the connecting columns are detachably connected with the mounting columns through bolts.

Through adopting above-mentioned technical scheme, rain-proof lid bears for a long time and blows to rain and drench and easily appear damaging, and rain-proof lid is removable, is convenient for maintain or change rain-proof lid.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the heat exchanger is arranged in the desulfurization slurry pool, so that the heat in the slurry can be recycled by the heat exchanger, and the energy waste caused by the heat in the slurry pool being dissipated to the environment is avoided;

2. through set up rain-proof lid in the upper end of desulfurizing tower, rain-proof lid can prevent that the rainwater from flowing backward into in the desulfurizing tower.

Drawings

FIG. 1 is a schematic flow diagram of a desulfurization and denitrification slurry tank waste heat recovery system;

FIG. 2 is a schematic structural view of a desulfurizing tower in the embodiment;

FIG. 3 is an enlarged schematic view of the structure A of FIG. 2;

FIG. 4 is a schematic structural diagram of a desulfurization slurry tank and a heat exchanger in the embodiment.

Description of reference numerals: 1. a raw coal boiler; 11. an air inlet pipe; 12. an air outlet pipe; 13. a bag-type dust collector; 14. an induced draft fan; 15. a desulfurizing tower; 2. a desulfurization slurry tank; 21. feeding the slurry into a pipe; 22. discharging a slurry; 23. a heat exchanger; 24. a cold water inlet pipe; 25. a hot water outlet pipe; 3. a water source heat pump; 31. a heating water supply pipe; 32. a heating pipe network; 33. a heating water outlet pipe; 4. an SCR knock-out device; 41. an air compressor; 42. an air preheater; 43. a hot air outlet pipe; 44. a blower; 5. a coal economizer; 6. a chimney; 66. a rain cover; 7. connecting columns; 8. and (6) mounting the column.

Detailed Description

The present application is described in further detail below with reference to figures 1-4.

The embodiment of the application discloses SOx/NOx control thick liquid pond waste heat recovery system.

Referring to fig. 1, a desulfurization and denitrification slurry tank waste heat recovery system includes a raw coal boiler 1, a desulfurization tower 15 and a desulfurization slurry tank 2. The raw coal boiler 1 is communicated with the desulfurizing tower 15, the desulfurizing slurry pool 2 is respectively communicated with a slurry inlet pipe 21 and a slurry outlet pipe 22, the desulfurizing slurry pool 2 is communicated with the desulfurizing tower 15 through the slurry inlet pipe 21 and the slurry outlet pipe 22, a heat exchanger 23 is arranged in the desulfurizing slurry pool 2, and the heat exchanger 23 can recycle the heat of the high-temperature slurry in the desulfurizing slurry pool 2, so that the energy is saved.

Referring to fig. 1, an SCR denitration device 4 is connected in series to a raw coal boiler 1, and the SCR denitration device 4 prevents a large amount of nitrified substances from being generated when coal in the raw coal boiler 1 is burned. An air compressor 41 is connected in series with one end of the SCR denitration device 4, and the air compressor 41 can provide compressed air for the SCR denitration device 4.

Referring to fig. 1, raw coal boiler 1 is communicated with inlet pipe 11 and outlet pipe 12, and inlet pipe 11 is communicated with air-blower 44, and air compressor 41 sets up in the air compressor computer lab, and air-blower 44 communicates with the air compressor room, can carry out recycle with the preheating that air compressor 41 during operation produced, helps the burning of raw coal in raw coal boiler 1.

Referring to fig. 1, an air preheater 42 is further communicated between the raw coal boiler 1 and the desulfurizing tower 15, the air preheater 42 is communicated with a cold air inlet pipe, external cold air can enter the air preheater 42 through the cold air inlet pipe, the air preheater 42 is communicated with a hot air outlet pipe 43, the hot air outlet pipe 43 is communicated with an air blower 44, the air preheater 42 heats smoke in a heating cooperation manner, the cold air is heated to be hot air, and energy consumption of the air preheater 42 is reduced.

Referring to fig. 1, the economizer 5 is connected in parallel to the air preheater 42, and the economizer 5 can absorb the heat in the raw coal boiler 1, assist the air preheater 42 to preheat the cold air, further recycle the energy, improve the energy utilization efficiency, and save the energy.

Referring to fig. 1, a bag-type dust collector 13 and an induced draft fan 14 are sequentially connected in series between the air preheater 42 and the desulfurizing tower 15, and the bag-type dust collector 13 can filter dust in flue gas to prevent the dust in the flue gas from polluting the environment. The induced draft fan 14 may direct the flue gas to the desulfurization tower 15. The upper end of the desulfurizing tower 15 is provided with a flue gas outlet, and the flue gas outlet can discharge flue gas after desulfurization. The flue gas outlet is communicated with a chimney 6, the chimney 6 can discharge the desulfurized flue gas, and the pollution of the flue gas to the environment can be reduced.

Referring to fig. 1, a rain cover 66 is arranged at the upper end of the chimney 6, six connecting columns 7 are arranged at the lower ends of the rain cover 66, and the rain cover 66 is connected with the chimney 6 through the connecting columns 7. The rain cover 66 can prevent rainwater from flowing backward into the chimney 6, and can play a role in rain prevention. The connecting column 7 plays a connecting role. The upper end of the chimney 6 is provided with six vertical mounting columns 8, the mounting columns 8 and the connecting columns 7 are detachably connected through bolts, the bolts are unscrewed, the rain-proof cover 66 can be detached, the bolts can be screwed up after the new rain-proof cover 66 is replaced, and the replacement of the rain-proof cover 66 can be completed.

Referring to fig. 1 and 4, the heat exchanger 23 is communicated with a cold water inlet pipe 24 and a hot water outlet pipe 25, the hot water outlet pipe 25 is communicated with the water source heat pump 3, one end of the water source heat pump 3, which is far away from the hot water outlet pipe 25, is communicated with a heating water supply pipe 31, and one end of the heating water supply pipe 31, which is far away from the hot water outlet pipe 25, is communicated with a heating pipe network 32. The cold water inlet pipe 24 can guide cold water into the heat exchanger 23, the hot water outlet pipe 25 can guide out hot water absorbing heat, the water source heat pump 3 is started, the water source heat pump 3 can exchange heat of the heat in the hot water outlet pipe 25 into water in the heating water supply pipe 31, and hot water continuously enters the heating pipe network 32 through the heating water supply pipe 31 to supply heat to a user.

Referring to fig. 1 and 4, the heat exchanger 23 is arranged at the lower end of one side of the desulfurization slurry pool 2, two ends of the heat exchanger 23 are connected with the connecting frame, two supporting frames are arranged in the middle of the heat exchanger 23, the heat exchanger 23 and the desulfurization slurry pool 2 are connected together by the connecting frame, and the supporting frames can play a main supporting role for the heat exchanger 23. The heat exchanger 23 is made of stainless steel, has good corrosion resistance, and has the effects of high heat exchange efficiency and stable heat exchange.

Referring to fig. 1, one end of the heating pipe network far away from the heating water supply pipe 31 is communicated with a heating water outlet pipe 33, the heating water outlet pipe 33 is communicated with the heating water supply pipe 31, and the heating water outlet pipe 33 is communicated with the cold water inlet pipe 24 through the water source heat pump 3. The hot water flows through heating pipe network 32 after the temperature reduces, the water after the cooling flows out from heating outlet pipe 33, start water source heat pump 3, water source heat pump 3 advances the water in pipe 24 to the water and the cold water in heating outlet pipe 33 and carries out the heat transfer, heat supply for the user again after the temperature of water in heating delivery pipe 31 rises, make the cold water advance the water cooling in pipe 24, cold water advances pipe 24 and can be with the leading-in heat exchanger 23 heat transfer of cooling water again, the cyclic utilization of cooling water in pipe 24 has been advanced to the cold water has been realized, the water resource has been practiced thrift.

The implementation principle of a desulfurization and denitrification slurry pool waste heat recovery system in the embodiment of the application is as follows: high-temperature flue gas generated by combustion in the raw coal boiler 1 firstly passes through the air preheater 42 and the economizer 5, and then passes through the bag-type dust collector 13, and then is pumped to the desulfurizing tower 15 by the draught fan 14, the flue gas is discharged from the chimney 6 at the upper end after sulfide is removed in the desulfurizing tower 15, the slurry enters the desulfurizing slurry pool 2 after the desulfurization in the desulfurizing tower 15 is finished, after the heat exchanger 23 absorbs heat in the slurry, the temperature of internal cooling water rises, and the heat can be supplied to a user through the heating pipe network 32.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The utility model provides a SOx/NOx control thick liquid pond waste heat recovery system which characterized in that: including raw coal boiler (1), raw coal boiler (1) intercommunication has intake pipe (11) and outlet duct (12), outlet duct (12) intercommunication has sack cleaner (13), the one end intercommunication that raw coal boiler (1) was kept away from in sack cleaner (13) has draught fan (14), draught fan (14) other end intercommunication has desulfurizing tower (15), the exhanst gas outlet has been seted up to the upper end of desulfurizing tower (15), desulfurizing tower (15) one side is equipped with desulfurization slurry pond (2), desulfurization slurry pond (2) communicate respectively has the thick liquid to advance pipe (21) and thick liquid exit tube (22), desulfurizing tower (15) advance pipe (21) and thick liquid exit tube (22) with the thick liquid respectively and are linked together, be equipped with heat exchanger (23) in desulfurization slurry pond (2), heat exchanger (23) intercommunication has cold water to advance pipe (24) and hot water exit tube (25), the hot water outlet pipe (25) is communicated with a water source heat pump (3), one end, far away from the hot water outlet pipe (25), of the water source heat pump (3) is communicated with a heating water supply pipe (31), and one end, far away from the hot water outlet pipe (25), of the heating water supply pipe (31) is communicated with a heating pipe network (32).

2. The desulfurization and denitrification slurry pool waste heat recovery system of claim 1, which is characterized in that: one end, far away from the heating water supply pipe (31), of the heating pipe network (32) is communicated with a heating water outlet pipe (33), the heating water outlet pipe (33) is communicated with the heating water supply pipe (31), and the water source heat pump (3) is arranged between the heating water outlet pipe (33) and the cold water inlet pipe (24).

3. The desulfurization and denitrification slurry pool waste heat recovery system of claim 1, which is characterized in that: the raw coal boiler (1) is connected in series with an SCR denitration device (4), and the SCR denitration device (4) is connected in series with an air compressor (41).

4. The desulfurization and denitrification slurry pool waste heat recovery system of claim 1, which is characterized in that: the air preheater (42) is communicated between the bag-type dust collector (13) and the raw coal boiler (1), the air preheater (42) is communicated with a cold air inlet pipe, the air preheater (42) is communicated with a hot air outlet pipe (43), one end of the hot air outlet pipe (43), which is far away from the air preheater (42), is communicated with an air blower (44), and one end, which is far away from the air preheater (42), of the air blower (44) is communicated with the raw coal boiler (1).

5. The desulfurization and denitrification slurry pool waste heat recovery system of claim 4, which is characterized in that: the air preheater (42) is connected with an economizer (5) in parallel.

6. The desulfurization and denitrification slurry pool waste heat recovery system of claim 1, which is characterized in that: and a flue gas outlet at the upper end of the desulfurizing tower (15) is communicated with a chimney (6).

7. The desulfurization and denitrification slurry pool waste heat recovery system of claim 6, which is characterized in that: the chimney cover is characterized in that a rain cover (66) is arranged at the upper end of the chimney (6), at least three connecting columns (7) are arranged at the lower end of the rain cover (66), and the rain cover (66) is connected with the chimney (6) through the connecting columns (7).

8. The desulfurization and denitrification slurry pool waste heat recovery system of claim 7, which is characterized in that: the chimney is characterized in that at least three vertical mounting columns (8) are arranged at the upper end of the chimney (6), and the connecting columns (7) are detachably connected with the mounting columns (8) through bolts.