CN210197332U - Cascade utilization deep coupling system for smoke, wind and sewage waste heat of coal-fired boiler - Google Patents
Cascade utilization deep coupling system for smoke, wind and sewage waste heat of coal-fired boiler Download PDFInfo
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- CN210197332U CN210197332U CN201920754823.1U CN201920754823U CN210197332U CN 210197332 U CN210197332 U CN 210197332U CN 201920754823 U CN201920754823 U CN 201920754823U CN 210197332 U CN210197332 U CN 210197332U
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
A cascade utilization depth coupling system for smoke, air and waste heat of a coal-fired boiler recovers heat to a steam turbine heat recovery system according to the temperature cascade depth coupling of various waste heat of the boiler. The method has the advantages of recovering the medium waste heat in the boiler area of the power plant, reducing the heat consumption of the unit, saving energy and reducing emission, and ensuring that the power plant can run green and economically.
Description
Technical Field
The utility model belongs to the cascade utilization and the working medium recovery technique of coal fired boiler flue gas, wind and blowdown waste heat of thermal power factory are applicable to the super supercritical above-grade coal fired boiler who adopts the intermediate speed to grind combustion system among the thermal power factory.
Background
In the coal-fired thermal power factory, boiler smoke, wind and start systems such as blowdown have a large amount of recoverable waste heat, and its main manifestation is: 1) the tail part of the boiler discharges flue gas, the flue gas which passes through a dust remover and is about 130 ℃ enters a desulfurizing tower to be desulfurized and cooled to about 50 ℃ and then is discharged into the atmosphere, and a large amount of cooling water is consumed while the heat is completely lost; 2) the temperature of the hot primary air of the boiler at the outlet of the air preheater reaches about 340-390 ℃, and the hot primary air and the temperature-adjusting air are mixed and cooled to about 260-320 ℃ before entering a coal mill, so that the heat of 100 ℃ is completely lost; 3) for the flushing water in the thermal state flushing of the once-through boiler, the water temperature is about 104 ℃, and the heat of the working medium is completely lost. At present, various recovery measures are adopted in large quantity aiming at the waste heat of boiler exhaust gas, but effective recovery and utilization measures are not adopted aiming at the waste heat loss of high-temperature primary air and starting and draining of a direct current furnace.
SUMMERY OF THE UTILITY MODEL
The utility model aims to recover the regional medium waste heat of power plant boiler, reduce the unit heat consumption, energy saving and emission reduction.
In order to achieve the above object, the utility model provides a step of coal fired boiler cigarette, wind and blowdown waste heat utilizes degree of depth coupled system, its characterized in that: the system comprises an air preheater bypass primary low-temperature economizer, an air preheater bypass secondary low-temperature economizer, a boiler smoke exhaust primary low-temperature economizer, a boiler smoke exhaust secondary low-temperature economizer, a condensed water heat exchanger, a heater and a hot primary air temperature-regulating heat exchanger, wherein one output end of a flue is connected with the air preheater bypass primary low-temperature economizer, the other output end of the flue is connected with the smoke side of an air preheater, one output end of the air preheater bypass primary low-temperature economizer is connected with the air preheater bypass secondary low-temperature economizer, the other output end of the air preheater bypass secondary low-temperature economizer is connected with a high-pressure water supply pipeline, one output end of the air preheater bypass secondary low-temperature economizer is connected with a condensed water pipeline, the other output end of the air preheater bypass secondary low-temperature economizer is converged with the smoke side output end of the air preheater and then connected with the boiler smoke exhaust primary low-temperature economizer, one output, one path is connected with the input end of a fan heater, the other path is connected with the input end of a heat medium water condensate heat exchanger, one output end of the fan heater is converged with one output end of the heat medium water condensate heat exchanger and then is connected with a second-stage low-temperature economizer for smoke exhaust of the boiler through a heat medium water booster pump, the output end of the second-stage low-temperature economizer for smoke exhaust of the boiler is connected with the input end of a first-stage low-temperature economizer for smoke exhaust of the boiler, the other output end of the fan heater is connected with the air side of an air preheater, one output end of the air side of the air preheater is connected with a hot air channel, one output end of the hot air channel is connected with a primary hot air temperature regulating heat exchanger, one output end of the primary hot air temperature regulating heat exchanger is connected with a high-pressure water supply pipeline, the other output end of the heat medium water condensate heat exchanger is connected with.
The condensed water pipeline is also connected to a connecting pipeline of the air heater and the inlet of the hot medium water booster pump through the hot medium water expansion tank.
And a dust remover and an induced draft fan are connected between the boiler smoke-discharging first-stage low-temperature economizer and the boiler smoke-discharging second-stage low-temperature economizer.
And a boiler starting drainage pump is connected to a boiler starting drainage pipeline of the boiler drain tank.
Compared with the prior art, the utility model has the advantages of as follows:
1. the secondary low-temperature economizer and the air preheater bypass design can divide the flue gas waste heat into four steps, the high-grade heat of the first step is used for heating high-pressure feed water, and high-pressure steam extraction of a steam turbine is saved; the heat with lower grade of the second step is used for heating part of high-temperature condensed water, so that low-pressure steam extraction of the steam turbine is saved; the third step and the fourth step of low-grade heat are used for heating cold air at the inlet of the air preheater and part of low-temperature condensed water through the air heater and the water-water heat exchanger, supplementing the heat lost by the boiler body through the bypass of the air preheater and ensuring the average wall temperature of the cold end of the air preheater, preventing the low-temperature corrosion of the air preheater, and simultaneously recovering the heat to a turbine regenerative system to reduce the heat consumption of the turbine.
2. The system is provided with a high-efficiency hot primary air temperature-adjusting heat exchanger, the high-temperature primary air waste heat heats high-pressure feed water, and the heat consumption of a steam turbine and the power consumption of a primary fan are continuously reduced, so that the thermal efficiency of the whole plant is higher.
3. The original condensed water heat exchanger in the system is utilized, the thermal state washing water of the boiler is utilized to drain water to heat the condensed water of the deaerator for replenishing water at the initial starting stage of the boiler, the amount of auxiliary steam used for starting the boiler is reduced, and the amount of fuel oil for starting the boiler is reduced; meanwhile, the cooled starting drainage can meet the requirement of downstream water temperature receiving speciality, reduce other cooling measures and meet the emission requirement.
Drawings
Fig. 1 is a scheme system diagram of the utility model.
Detailed Description
As shown in fig. 1, a flue, 2, an air preheater bypass primary low-temperature economizer, 3, a high-pressure water supply pipeline, 4, an air preheater bypass secondary low-temperature economizer, 5, a condensed water pipeline, 6, a boiler smoke exhaust primary low-temperature economizer, 7, a dust remover, 8, an induced draft fan, 9, a boiler smoke exhaust secondary low-temperature economizer, 10, a desulfurization tower, 11, a hot water pipeline, 12, a hot water (starting drainage) -condensed water heat exchanger, 13, a hot water booster pump, 14, a heater, 15, a cold air channel, 16, an air preheater, 17, a hot air channel, 18, a hot primary air temperature regulating heat exchanger, 19, a hot water expansion tank, 20, a boiler drain tank, 21, a boiler starting drainage pump, 22 and a boiler starting drainage pipeline.
The main process of the system is as follows:
a small part of flue gas in a flue 1 enters an air preheater bypass primary low-temperature economizer 2 to heat a high-pressure water supply pipeline 3, the cooled flue gas enters an air preheater bypass secondary low-temperature economizer to heat a condensed water pipeline 5, the cooled flue gas is mixed with most of the other flue gas entering an air preheater 16 to exchange heat and then enters a boiler smoke exhaust primary low-temperature economizer 6, the flue gas enters the boiler smoke exhaust primary low-temperature economizer after the flue gas temperature meets the requirement of the inlet smoke temperature of a low-temperature dust remover 7 after the flue gas temperature exchanges heat with hot medium water, the flue gas is sent to a boiler smoke exhaust secondary low-temperature economizer 9 through an induced draft fan 8 to still exchange heat with the hot medium water, the flue gas enters the boiler smoke exhaust secondary low-temperature economizer after the.
The heat medium water after heat exchange in the boiler exhaust gas first-stage low-temperature economizer 6 exchanges heat with cold air from a cold air channel 15 through an air heater 14, in order to maintain constant boiler heat balance and constant boiler efficiency, the cold air needs to be heated to the air temperature requirement of an air preheater inlet and then enters an air preheater 16 for heat exchange, heat absorption and temperature rise are continued, high-temperature hot primary air enters a hot primary air temperature adjusting heat exchanger 18 for heat exchange and cooling with a high-pressure water supply pipeline 3 to meet the air temperature requirement of a coal mill inlet, and at the moment, an air door of a temperature adjusting air pipeline is in a closed state and serves as a standby pipeline. After high-pressure feed water is heated, heat is recycled to a turbine regenerative system.
After the heat medium water heating air heater 14 meets the requirement of the boiler, the heat medium water (starting drainage) -condensed water heat exchanger 12 is used for heating the condensed water, and the heat is recycled to the turbine heat recovery system.
At the initial stage of boiler starting, the hot-state flushing water of the boiler drains water and enters the boiler drain tank 20, and then heat medium water (starting drainage) enters the boiler starting drainage pump 21, namely the condensate water heat exchanger 12 heats condensate water of the deaerator for water supplement, and heat is recovered.
The condensed water pipe 5 or chemical water supply from the heat medium water expansion water tank 19 supplies water in a heat medium water closed circulation system to keep balance, the heat medium water booster pump 13 delivers the water to the boiler smoke discharge secondary low-temperature economizer 9 to exchange heat with the flue gas, the heat medium water after heat exchange enters the boiler smoke discharge primary low-temperature economizer 6 to exchange heat with the flue gas before the dust remover 7, the heat medium water after heat exchange enters the air heater 14 to exchange heat with cold air, and the heat medium water after temperature reduction enters the heat medium water booster pump 13 to carry out a closed circulation process.
The hot primary air and the flue gas temperature can meet the highest water supply requirement of the existing unit, so that the water supply of the two heaters can be pumped out from the outlet of the water supply pump, and the heated water is supplied to the inlet of the boiler economizer.
The air preheater bypass secondary low-temperature economizer 4 and the heat medium water (starting drainage) -condensed water required by the condensed water heat exchanger 12 can select a proper water taking point according to the parameter values of thermodynamic systems of different units, and the condensed water is heated to the requirement of the water temperature at the inlet of the deaerator.
The flue gas waste heat, hot air waste heat and sewage discharge waste heat cascade coupling utilization system avoids waste heat, and the waste heat is completely recycled to the turbine heat recovery system, so that the heat consumption value of the turbine is reduced, the thermal efficiency of the whole plant is reduced, and the best effects of energy conservation and emission reduction are achieved.
Claims (4)
1. The utility model provides a coal fired boiler cigarette, wind and blowdown waste heat's cascade utilization degree of depth coupled system which characterized in that: the system comprises an air preheater bypass primary low-temperature economizer, an air preheater bypass secondary low-temperature economizer, a boiler smoke exhaust primary low-temperature economizer, a boiler smoke exhaust secondary low-temperature economizer, a condensed water heat exchanger, a heater and a hot primary air temperature regulating heat exchanger, wherein one output end of a bypass flue at the outlet of a boiler denitration device is connected with the air preheater bypass primary low-temperature economizer, the other output end of the bypass flue of the air preheater bypass primary low-temperature economizer is connected with the smoke side of an air preheater, one output end of the air preheater bypass primary low-temperature economizer is connected with the air preheater bypass secondary low-temperature economizer, the other output end of the air preheater bypass secondary low-temperature economizer is connected with a high-pressure water supply pipeline, one output end of the air preheater bypass secondary low-temperature economizer is connected with a condensed water pipeline, the other output end of the air preheater flue side is converged with the smoke exhaust primary low-temperature economizer, one output, the other output end of the boiler smoke-discharging secondary low-temperature economizer is connected with the input end of the boiler smoke-discharging primary low-temperature economizer after being converged with the output end of the heat medium water condensate heat exchanger, the output end of the boiler smoke-discharging secondary low-temperature economizer is connected with the input end of the boiler smoke-discharging primary low-temperature economizer, the other output end of the heater is connected with the air side of the air preheater, one output end of the air side of the air preheater is connected with the hot air duct, one output end of the hot air duct is connected with the hot primary air temperature-adjusting heat exchanger, one output end of the hot primary air temperature-adjusting heat exchanger is connected with the high-pressure water supply pipeline, the other output end of the heat medium water condensate heat exchanger is connected with the condensate pipeline, the cold air duct is connected with the other input end of the heater, and the pipeline of the boiler smoke-discharging primary low-temperature economizer, which is connected with the heat medium water condensate.
2. The cascade utilization deep coupling system for smoke, wind and sewage waste heat of coal-fired boiler according to claim 1, characterized in that: the condensed water pipeline is also connected to a connecting pipeline of the air heater and the inlet of the hot medium water booster pump through the hot medium water expansion tank.
3. The cascade utilization deep coupling system for smoke, wind and sewage waste heat of coal-fired boiler according to claim 1, characterized in that: and a dust remover and an induced draft fan are connected between the boiler smoke-discharging first-stage low-temperature economizer and the boiler smoke-discharging second-stage low-temperature economizer.
4. The cascade utilization deep coupling system for smoke, wind and sewage waste heat of coal-fired boiler according to claim 1, characterized in that: and a boiler starting drainage pump is connected to a boiler starting drainage pipeline of the boiler drainage tank.
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| CN201920754823.1U CN210197332U (en) | 2019-05-23 | 2019-05-23 | Cascade utilization deep coupling system for smoke, wind and sewage waste heat of coal-fired boiler |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111442294A (en) * | 2020-04-15 | 2020-07-24 | 哈尔滨锅炉厂有限责任公司 | Boiler and steam turbine coupling thermodynamic system for improving efficiency of gas turbine unit |
| CN111678116A (en) * | 2020-05-25 | 2020-09-18 | 大唐东北电力试验研究院有限公司 | Gradient utilization method for flue gas of 1000MW double reheating power plant |
| CN111678117A (en) * | 2020-05-25 | 2020-09-18 | 大唐东北电力试验研究院有限公司 | Exhaust smoke waste heat recovery system of 1000MW secondary reheating power plant |
| CN112555801A (en) * | 2020-12-29 | 2021-03-26 | 华能太仓发电有限责任公司 | Waste heat recovery system for coupling internal combustion engine and coal-fired unit condensed water and water supply system |
| CN112879938A (en) * | 2021-01-26 | 2021-06-01 | 东方电气集团东方汽轮机有限公司 | Machine-furnace coupled waste heat deep utilization system of bituminous coal unit |
-
2019
- 2019-05-23 CN CN201920754823.1U patent/CN210197332U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111442294A (en) * | 2020-04-15 | 2020-07-24 | 哈尔滨锅炉厂有限责任公司 | Boiler and steam turbine coupling thermodynamic system for improving efficiency of gas turbine unit |
| CN111678116A (en) * | 2020-05-25 | 2020-09-18 | 大唐东北电力试验研究院有限公司 | Gradient utilization method for flue gas of 1000MW double reheating power plant |
| CN111678117A (en) * | 2020-05-25 | 2020-09-18 | 大唐东北电力试验研究院有限公司 | Exhaust smoke waste heat recovery system of 1000MW secondary reheating power plant |
| CN112555801A (en) * | 2020-12-29 | 2021-03-26 | 华能太仓发电有限责任公司 | Waste heat recovery system for coupling internal combustion engine and coal-fired unit condensed water and water supply system |
| CN112879938A (en) * | 2021-01-26 | 2021-06-01 | 东方电气集团东方汽轮机有限公司 | Machine-furnace coupled waste heat deep utilization system of bituminous coal unit |
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