CN210197331U - Combined system for eliminating smoke plume and utilizing low-grade flue gas waste heat - Google Patents
Combined system for eliminating smoke plume and utilizing low-grade flue gas waste heat Download PDFInfo
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- CN210197331U CN210197331U CN201920812575.1U CN201920812575U CN210197331U CN 210197331 U CN210197331 U CN 210197331U CN 201920812575 U CN201920812575 U CN 201920812575U CN 210197331 U CN210197331 U CN 210197331U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Abstract
The utility model relates to a power plant's cigarette feather is eliminated and low-grade flue gas waste heat utilization field discloses a combined system that cigarette feather was eliminated and low-grade flue gas waste heat utilization very much. This combined system, including installing the thick liquid heat exchanger in desulfurization thick liquid export, its characterized in that: the slurry heat exchanger is communicated with the absorption tower through a slurry pipeline; an air spray tower is arranged on a cold air duct at the inlet of the blower, and an air reheater is arranged on the outlet of the air spray tower; the water outlet and the water inlet of the air spray tower are respectively connected with the water inlet and the water outlet of the slurry heat exchanger; a flue gas cooler is arranged in a flue from an outlet of the air preheater to an inlet of the electric dust collector, a hydrophily air heater is arranged in an outlet cold air channel of the air feeder, and the flue gas cooler is connected with a condensed water system. The utility model relates to a rationally, use in a flexible way, adopt the circulating water to reduce the temperature of desulfurization thick liquid, the circulating water combines the air supply of heating boiler jointly with air reheater, hydrophily fan heater, and exhaust gas temperature is corresponding to be improved.
Description
(I) technical field
The utility model relates to a power plant's cigarette feather is eliminated and low-grade flue gas waste heat utilization field, in particular to combined system that cigarette feather was eliminated and low-grade flue gas waste heat utilization.
(II) background of the invention
At present, most of flue gas desulfurization processes of coal-fired power plants adopt wet desulfurization, saturated wet flue gas at the outlet of a desulfurization tower contains a large amount of water vapor, the flue gas is contacted with low-temperature air when being discharged from a chimney, and the saturated water vapor is condensed due to temperature reduction to form white smoke plume, so that visual pollution is caused.
Disclosure of the invention
The utility model provides a make up the not enough of prior art, provide a combined system that smoke plume elimination and low-grade flue gas waste heat utilization that technology reasonable in design, solution visual pollution, obtain energy-conserving benefit.
The utility model discloses a realize through following technical scheme:
a combined system for eliminating smoke plume and utilizing low-grade flue gas waste heat comprises a slurry heat exchanger arranged at a desulfurization slurry outlet, wherein the slurry heat exchanger is communicated with an absorption tower through a slurry pipeline by a slurry circulating pump, and cooled desulfurization slurry enters a spray layer of the absorption tower; an air spray tower is arranged on a cold air duct at the inlet of the air feeder, an air reheater is designed at the outlet of the air spray tower, and an original cold air inlet is reserved; the water outlet of the air spray tower is boosted by a circulating water pump through a circulating water inlet pipe and then is connected with the slurry heat exchanger, and the heated circulating water enters the air spray tower through a circulating water outlet pipe for spraying; the flue gas cooler is designed in an outlet of the air preheater to an inlet flue of the electric dust collector, the hydrophily air heater is installed in a cold air duct at an outlet of the air feeder, the flue gas cooler is connected with a condensate system through a water inlet main pipe through a booster pump, water flows out of the flue gas cooler and enters the hydrophily air heater through a water return main pipe, and the water enters the air reheater and the residual part returns to the condensate system.
The utility model discloses a more excellent technical scheme does:
the baffle door is arranged on the cold air inlet channel of the blower, the cold air inlet channel is communicated with the primary cold air channel, and the primary cold air channel is provided with the primary baffle door; realizes the reservation of the original cold air inlet
An air spray regulating valve is installed on a water inlet of the air spray tower, a water outlet of the air spray tower is communicated with a water replenishing tank through a water replenishing gate valve, and a circulating water pump is installed on a circulating water inlet pipe communicated with the water outlet of the air spray tower; the regulation of the water level in the air spray tower and the hydrodynamic flow in the circulating water pipeline are realized.
A circulating water inlet gate valve is arranged on a circulating water inlet pipe of the slurry heat exchanger, and a circulating water outlet gate valve is arranged on a circulating water outlet pipe; a circulating cooling water inlet gate valve is arranged on the circulating cooling water inlet pipe, and a circulating cooling water outlet gate valve is arranged on the circulating cooling water outlet pipe; in the season of higher temperature, realize the water supply switching of cooling water.
A booster pump is installed on a water inlet main pipe of the flue gas cooler, and the water inlet main pipe is connected with an air reheater, a water medium air heater and a condensate system in parallel, so that water in the system can be recycled.
And an inlet and an outlet of the hydrophily air heater are respectively provided with an inlet regulating valve of the air heater and an outlet gate valve of the air heater, and an inlet and an outlet of the air reheater are respectively provided with an inlet regulating valve of the reheater and an outlet gate valve of the reheater.
Condensate system includes No. 8 low pressure feed water heaters, No. 7 low pressure feed water heaters, No. 6 low pressure feed water heaters and No. 5 low pressure feed water heaters that establish ties in proper order through the condensate pipe, and wherein, No. 8 low pressure feed water heaters and No. 7 low pressure feed water heaters formula as an organic whole that makes up install condensate pump on the condensate pipe.
The water inlet main pipe is communicated with a water inlet of the No. 8 low-pressure heater and a water outlet of the No. 7 low-pressure heater in parallel, and a cooler inlet regulating valve and a cooler inlet gate valve are respectively arranged on the communicating pipeline; the outlet main pipe is connected to an outlet pipeline of the No. 6 low-pressure heater, and a return water regulating valve is installed on the outlet main pipe.
The utility model discloses in, the cooling of desulfurization thick liquid adopts different cooling methods in different seasons.
Under the working condition in winter, circulating water enters the slurry heat exchanger through the circulating water pump to reduce the temperature of the desulfurized slurry, so that the temperature of the flue gas at the outlet of the absorption tower is reduced, the moisture content of the saturated wet flue gas is reduced, and the aim of eliminating white smoke is fulfilled. The heated circulating water sprays the air, and heats and humidifies the air. The air reheater heats the air heated and humidified by the air spray tower again, so that the relative humidity of the air is reduced, and the inlet air temperature of the air preheater can be controlled by adjusting the flow of the working medium of the water medium air heater. The air supply temperature of the boiler is improved through the combined action of the air spray tower, the air reheater and the water medium air heater, and the temperature of smoke at the outlet of the air preheater is correspondingly increased. And one part of the flue gas waste heat absorbed by the flue gas cooler is used for heating cold air, and the rest is used for heating condensed water of the steam turbine, so that the coal consumption is increased, and the amount is saved.
And in summer working conditions, cooling the desulfurization slurry by using circulating cooling water, and stopping the air spray tower and the air reheater. And circulating cooling water enters the slurry heat exchanger to reduce the temperature of the desulfurized slurry, so that the temperature of the flue gas at the outlet of the absorption tower is reduced, the moisture content of the saturated wet flue gas is reduced, and the aim of eliminating white smoke is fulfilled. The water medium air heater is used for improving the air supply temperature of the boiler, one part of the flue gas waste heat absorbed by the flue gas cooler is used for heating cold air, and the rest is used for heating the condensed water of the steam turbine, so that the coal consumption is increased, and the amount is saved.
The utility model relates to a rationally, use in a flexible way, adopt the circulating water to reduce the temperature of desulfurization thick liquid, the circulating water combines the air supply of heating boiler jointly with air reheater, hydrophily fan heater, and the corresponding improvement of exhaust gas temperature designs the flue gas cooler and retrieves low-grade flue gas waste heat in the system, can obtain better economic benefits.
(IV) description of the drawings
The present invention will be further described with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of the present invention.
In the figure, 1 slurry heat exchanger, 2 slurry circulating pump, 3 circulating water outlet pipe, 4 circulating water inlet pipe, 5 circulating water outlet gate valve, 6 circulating water inlet gate valve, 7 slurry pipeline, 8 absorption tower, 9 circulating water pump, 10 air spray regulating valve, 11 water replenishing gate valve, 12 water replenishing tank, 13 air spray tower, 14 air reheater, 15 baffle door, 16 original baffle door, 17 water medium air heater, 18 air heater inlet regulating valve, 19 air heater outlet gate valve, 20 reheater inlet regulating valve, 21 reheater outlet gate valve, 22 cooler inlet regulating valve, 23 reheater inlet gate valve, 24 booster pump, 25 inlet header pipe, 26 flue gas cooler, 27 outlet header pipe, 28 return water regulating valve, 29 original cold air pipeline, 30 circulating cooling water inlet gate valve, 31 circulating cooling water outlet gate valve.
(V) detailed description of the preferred embodiments
The attached drawing is a concrete embodiment of the utility model. The device comprises an air preheater, an electric dust remover and an induced draft fan which are positioned in a boiler flue and sequentially arranged along the flowing direction of flue gas, and a slurry heat exchanger 1 arranged at a desulfurization slurry outlet, wherein an air feeder is connected to an inlet cold air duct of the air preheater, the slurry heat exchanger 1 is communicated with an absorption tower 8 through a slurry pipeline 7 and a slurry circulating pump 2, and the absorption tower 8 is connected with the induced draft fan and a chimney; an air spray tower 13 is arranged on a cold air channel at the inlet of the blower, and an air reheater 14 is arranged on the outlet of the air spray tower 13; the water outlet of the air spray tower 13 is connected with the slurry heat exchanger 1 through a circulating water inlet pipe 4, the water outlet of the slurry heat exchanger 1 is connected with the water inlet of the air spray tower 13 through a circulating water outlet pipe 3, and the water inlet and the water outlet of the slurry heat exchanger 1 are respectively communicated with a circulating cooling water inlet pipe and a circulating cooling water outlet pipe; a flue gas cooler 26 is arranged in a flue from an outlet of the air preheater to an inlet of the electric dust collector, a hydrophily air heater 17 is arranged in a cold air channel at an outlet of the air feeder, the flue gas cooler 26 is connected with a condensed water system through a water inlet main pipe 25, and the flue gas cooler 26 is connected with the hydrophily air heater 17, the air reheater 14 and the condensed water system in parallel through a water outlet main pipe 27.
Under the working condition in winter, the slurry enters the slurry heat exchanger 1 through the slurry circulating pump 2, and the cooled slurry enters the spray layer of the absorption tower 8 to spray the flue gas. Circulating water enters the slurry heat exchanger 1 through the circulating water inlet pipe 4 through the circulating water pump 9 and the circulating water inlet gate valve 6, the slurry is cooled, and the temperature of flue gas is reduced. The heated circulating water enters an air spray tower 13 through a circulating water outlet pipe 3 via a circulating water outlet gate valve 5 and an air spray regulating valve 10, and air is sprayed to complete circulation. And a water replenishing gate valve 11 and a water replenishing tank 12 are designed at the inlet of the circulating water pump 9 and used for replenishing water for the system.
No. 8 low inlet condensate that adds mixes at female pipe 25 of intaking through cooler inlet governing valve 22, No. 7 low outlet condensate that adds through cooler inlet gate valve 23, and the control water temperature is not less than 70 ℃, enters flue gas cooler 26 after stepping up by booster pump 25 and absorbs heat, and the condensate after the heat absorption divides into three routes through female pipe 27 of play water: one path enters the water medium air heater 17 through the air heater inlet adjusting valve 18 to release heat, and returns to the inlet of the booster pump 24 through the air heater outlet gate valve 19 after releasing heat; one path enters an air reheater 14 through a reheater inlet regulating valve 20 to release heat, and returns to an inlet of a booster pump 24 through a reheater outlet gate valve 21 after heat release; and the other path is returned to the condensate system through a return water regulating valve 28. The blower inlet air temperature can be adjusted by the combined action of the air reheater inlet adjusting valve 20 and the return water adjusting valve 28, and the inlet air temperature of the air preheater can be adjusted by the combined action of the air heater inlet adjusting valve 18 and the return water adjusting valve 28.
In this condition, the circulating cooling water inlet gate valve 30, the circulating cooling water outlet gate valve 31 and the original flapper door 16 are closed.
In summer, when the external environment temperature is high, the air spray tower 13 and the air reheater 14 are shut down, the circulating water inlet gate valve 6, the circulating water outlet gate valve 5, the baffle door 15, the reheater inlet regulating valve 20 and the reheater outlet gate valve 21 are all closed, and the desulfurization slurry is cooled by circulating cooling water. The circulating cooling water enters the slurry cooler 1 through the circulating cooling water inlet gate valve 30 to absorb heat, and flows out through the circulating cooling water outlet gate valve 31 after absorbing heat.
No. 8 low inlet condensate that adds mixes at female pipe 25 of intaking through cooler inlet governing valve 22, No. 7 low outlet condensate that adds through cooler inlet gate valve 23, and the control water temperature is not less than 70 ℃, enters flue gas cooler 26 after booster pump 25 steps up and absorbs heat, and the condensate after the heat absorption is divided into two through female pipe 27 of play water: one path enters the water medium air heater 17 through the air heater inlet adjusting valve 18 to release heat, and after releasing heat, the heat returns to the inlet of the booster pump 24 through the air heater outlet gate valve 19, and the other path returns to a condensed water system through the return water adjusting valve 28. The inlet air temperature of the air preheater may be adjusted by the combined action of the heater inlet adjustment valve 18 and the return water adjustment valve 28.
Claims (8)
1. The utility model provides a combined system of plume elimination and low-grade flue gas waste heat utilization, is including being located boiler flue, air heater, electrostatic precipitator and the draught fan that arranges in proper order along flue gas flow direction to and install slurry heat exchanger (1) at desulfurization slurry outlet, be connected with the forced draught blower on air heater's the import cold air duct, its characterized in that: the slurry heat exchanger (1) is communicated with an absorption tower (8) through a slurry pipeline (7) and a slurry circulating pump (2), and the absorption tower (8) is connected with an induced draft fan and a chimney; an air spray tower (13) is arranged on a cold air channel at the inlet of the blower, and an air reheater (14) is arranged on the outlet of the air spray tower (13); the water outlet of the air spray tower (13) is connected with the slurry heat exchanger (1) through a circulating water inlet pipe (4), the water outlet of the slurry heat exchanger (1) is connected with the water inlet of the air spray tower (13) through a circulating water outlet pipe (3), and the water inlet and the water outlet of the slurry heat exchanger (1) are respectively communicated with a circulating cooling water inlet pipe and a circulating cooling water outlet pipe; install flue gas cooler (26) in the flue of air heater export to electrostatic precipitator entry, install hydrophily fan heater (17) in the export cold air duct of forced draught blower, flue gas cooler (26) are connected with condensate system through female pipe (25) of intaking, flue gas cooler (26) are through going out female pipe (27) parallel connection hydrophily fan heater (17), air reheater (14) and condensate system.
2. The combined system for smoke plume elimination and low-grade flue gas waste heat utilization according to claim 1, which is characterized in that: a baffle door (15) is installed on a cold air inlet channel of the air feeder, the cold air inlet channel is communicated with a primary cold air channel (29), and a primary baffle door (16) is installed on the primary cold air channel (29).
3. The combined system for smoke plume elimination and low-grade flue gas waste heat utilization according to claim 1, which is characterized in that: install air shower governing valve (10) on the water inlet of air shower tower (13), the delivery port of air shower tower (13) is through moisturizing gate valve (11) intercommunication moisturizing case (12), installs circulating water pump (9) on circulating water inlet tube (4) of intercommunication air shower tower (13) delivery port.
4. The combined system for smoke plume elimination and low-grade flue gas waste heat utilization according to claim 1, which is characterized in that: a circulating water inlet gate valve (6) is installed on a circulating water inlet pipe (4) of the slurry heat exchanger (1), and a circulating water outlet gate valve (5) is installed on a circulating water outlet pipe (3); and a circulating cooling water inlet gate valve (30) is installed on the circulating cooling water inlet pipe, and a circulating cooling water outlet gate valve (31) is installed on the circulating cooling water outlet pipe.
5. The combined system for smoke plume elimination and low-grade flue gas waste heat utilization according to claim 1, which is characterized in that: a booster pump (24) is installed on a water inlet main pipe (25) of the flue gas cooler (26), and the water inlet main pipe (25) is communicated with the air reheater (14), the water medium air heater (17) and a condensate system in parallel.
6. The combined system for smoke plume elimination and low-grade flue gas waste heat utilization according to claim 1, which is characterized in that: condensate system includes No. 8 low pressure feed water heaters, No. 7 low pressure feed water heaters, No. 6 low pressure feed water heaters and No. 5 low pressure feed water heaters that establish ties in proper order through the condensate pipe, and wherein, No. 8 low pressure feed water heaters and No. 7 low pressure feed water heaters formula as an organic whole that makes up install condensate pump on the condensate pipe.
7. The combined system for smoke plume elimination and low-grade flue gas waste heat utilization according to claim 1, which is characterized in that: and an inlet and an outlet of the water medium air heater (17) are respectively provided with an air heater inlet regulating valve (18) and an air heater outlet gate valve (19), and an inlet and an outlet of the air reheater (14) are respectively provided with a reheater inlet regulating valve (20) and a reheater outlet gate valve (21).
8. The combined system for smoke plume elimination and low-grade flue gas waste heat utilization according to claim 6, wherein: the water inlet main pipe (25) is communicated with a water inlet of the No. 8 low-pressure heater and a water outlet of the No. 7 low-pressure heater in parallel, and a cooler inlet adjusting valve (22) and a cooler inlet gate valve (23) are respectively arranged on the communicating pipeline; the outlet main pipe (27) is connected to an outlet pipeline of the No. 6 low-pressure heater, and a return water regulating valve (28) is installed on the outlet main pipe (27).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920812575.1U CN210197331U (en) | 2019-05-31 | 2019-05-31 | Combined system for eliminating smoke plume and utilizing low-grade flue gas waste heat |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920812575.1U CN210197331U (en) | 2019-05-31 | 2019-05-31 | Combined system for eliminating smoke plume and utilizing low-grade flue gas waste heat |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111678159A (en) * | 2020-06-09 | 2020-09-18 | 国网天津市电力公司电力科学研究院 | Comprehensive smoke plume treatment system suitable for high-smoke-discharge-temperature coal-fired boiler |
| CN112856811A (en) * | 2021-01-27 | 2021-05-28 | 西安热工研究院有限公司 | Double-stage anti-freezing air heater system |
-
2019
- 2019-05-31 CN CN201920812575.1U patent/CN210197331U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111678159A (en) * | 2020-06-09 | 2020-09-18 | 国网天津市电力公司电力科学研究院 | Comprehensive smoke plume treatment system suitable for high-smoke-discharge-temperature coal-fired boiler |
| CN112856811A (en) * | 2021-01-27 | 2021-05-28 | 西安热工研究院有限公司 | Double-stage anti-freezing air heater system |
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