CN104930496A - Combined air supply heating depth waste heat recycling system of low-low-temperature economizer of coal-fired unit - Google Patents
Combined air supply heating depth waste heat recycling system of low-low-temperature economizer of coal-fired unit Download PDFInfo
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Abstract
The invention relates to the field of smoke exhaust waste heat utilization of a boiler, and particularly discloses a combined air supply heating depth waste heat recycling system of a low-low-temperature economizer of a coal-fired unit. The waste heat recycling system is characterized in that a low-low-temperature economizer high-temperature segment is arranged in a front flue of an electrostatic precipitator, and a low-low-temperature economizer low-temperature segment is arranged at the position from an induced draft fan outlet to a desulfurizing tower inlet flue; the low-low-temperature economizer high-temperature segment is connected with a condensate pipeline of a condenser, and the low-low-temperature economizer low-temperature segment is in parallel connection with a primary air heater and a secondary air heater through low-low-temperature economizer low-temperature segment water outlet pipelines; and the water outlet pipeline of the primary air heater and the water outlet pipeline of the secondary air heater are communicated with a low-low-temperature economizer low-temperature segment water returning pipeline of the low-low-temperature economizer low-temperature segment. The temperature of the smoke of the desulfurizing tower inlet is reduced to about 50 DEG C, coal saving benefits are obtained, meanwhile, the water consumption of a desulfurizing tower is reduced, and the whole running benefits of a power plant is greatly improved.
Description
(1) technical field
The present invention relates to boiler exhaust gas field of waste heat utilization, particularly air-supply heat penetration residual neat recovering system combined by the low low-level (stack-gas) economizer of a kind of coal unit.
(2) background technology
Current domestic conventional low voltage economizer cooling extent is minimum to about 90 DEG C, and the low-temperature zone of heating surface often needs to adopt steel alloy to meet the problems such as cold end corrosion.The new 2014-2020 " coal electricity energy-saving and emission-reduction upgrading and transformation action plan " put into effect of country requires that active service unit net coal consumption rate is reached advanced world standards, and this just needs boiler exhaust gas heat recovery technology will have new breakthrough at deeply reducing exhausted smoke temperature.
In addition the optimal reaction temperature of wet desulphurization is about 50 DEG C, and the flue gas of higher cigarette temperature enters desulphurization system, and desulfurization water consumption can be caused to increase, and then makes that chimney water capacity increases, chimney reduces from pull out force.By the flue-gas temperature degree of depth is reduced to about 50 DEG C, can Mist heat recovering in a large number, reduce desulfurization water consumption, effectively improve power plant's overall operation benefit.
(3) summary of the invention
The present invention, in order to make up the deficiencies in the prior art, provides and a kind ofly reduces desulfurizing tower water consumption, improves the low low-level (stack-gas) economizer of coal unit of efficiency of dust collection and combine air-supply heat penetration residual neat recovering system.
The present invention is achieved through the following technical solutions:
Air-supply heat penetration residual neat recovering system combined by the low low-level (stack-gas) economizer of a kind of coal unit, it is characterized in that: low low-level (stack-gas) economizer high temperature section is installed in flue before electrostatic precipitator, be exported in desulfurizing tower gas approach at air-introduced machine and low low-level (stack-gas) economizer low-temperature zone is installed, in an air channel, First air steam air heater is set, Secondary Air steam air heater is set in secondary air duct, low low-level (stack-gas) economizer high temperature section is connected with condenser condensed water pipeline, low low-level (stack-gas) economizer low-temperature zone is connected in parallel with First air steam air heater and Secondary Air steam air heater respectively by low low-level (stack-gas) economizer low-temperature zone outlet conduit, First air steam air heater is communicated with the low low-level (stack-gas) economizer low-temperature zone water return pipeline of low low-level (stack-gas) economizer low-temperature zone with the outlet conduit of Secondary Air steam air heater.
Low low-level (stack-gas) economizer low-temperature zone outlet recirculated water flows into First air and Secondary Air steam air heater through circulating pump, steam air heater outlet header is flowed into through snake-like tube row, after steam air heater water return pipeline collects, flow into low low-level (stack-gas) economizer low-temperature zone water return pipeline, form a closed cycle water route.
More excellent scheme of the present invention is:
Described low low-level (stack-gas) economizer high temperature section installs booster and water inlet check-valves on low low-level (stack-gas) economizer inlet channel, low low-level (stack-gas) economizer inlet channel is communicated with the low-pressure heater of two series connection with low-pressure heater entrance inlet valve by low-pressure heater outlet inlet valve, low-pressure heater is communicated with condenser; The low low-level (stack-gas) economizer water return pipeline of low low-level (stack-gas) economizer high temperature section is communicated with oxygen-eliminating device by low low-level (stack-gas) economizer water return pipeline valve.
The high temperature section water side of low low-level (stack-gas) economizer is drawn and is added entrance from low and lowly add outlet conduit, takes to add heat regenerative system mode in parallel with low.The low-pressure heater main condensate of being drawn by condensate system, through low low-level (stack-gas) economizer inlet channel booster boosting, low low-level (stack-gas) economizer high temperature section is entered through low low-level (stack-gas) economizer high temperature section entrance header, flow into low low-level (stack-gas) economizer high temperature section outlet header through snake-like tube row, enter condensate system by low low-level (stack-gas) economizer water return pipeline.
Described low low-level (stack-gas) economizer high temperature section is provided with low low-level (stack-gas) economizer high temperature section entrance header and low low-level (stack-gas) economizer high temperature section outlet header, low low-level (stack-gas) economizer low-temperature zone is provided with low low-level (stack-gas) economizer low-temperature zone entrance header and low low-level (stack-gas) economizer low-temperature zone outlet header.
Described First air steam air heater is provided with First air steam air heater entrance header and First air steam air heater outlet header; Secondary Air steam air heater is provided with Secondary Air steam air heater entrance header and Secondary Air steam air heater outlet header.
The outlet pipe of described First air steam air heater is provided with First air steam air heater inlet regulating valve, the outlet pipe of Secondary Air steam air heater is provided with Secondary Air steam air heater inlet regulating valve.
The body of described low low-level (stack-gas) economizer high temperature section, low low-level (stack-gas) economizer low-temperature zone, First air steam air heater and Secondary Air steam air heater is snake-like tube row, selects " H " type extended surface tube.
The smoke discharging residual heat that the present invention reclaims is for two parts, a part is used for adding Hot gas turbine condensate water and realizes economizing on coal, another part is for heating primary and secondary air, improve air preheater cold section of comprehensive tube wall temperature, alleviate cold junction blocking and corrosion, winter, alternative conventional steam steam air heater, saved consumption vapour.Enter stove cold wind temperature to improve, improve boiler efficiency, low low-level (stack-gas) economizer inlet flue gas temperature and mechanical efficiency improve thereupon.
The desulfurizing tower inlet flue gas temperature degree of depth can be reduced to about 50 DEG C by the present invention, while obtaining benefit of saving coal, reduces desulfurizing tower water consumption, greatly improves power plant's overall operation benefit; In addition electrostatic precipitator inlet flue gas temperature is reduced to 90 DEG C, improves the efficiency of dust collection of electric cleaner.
(4) accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention is further illustrated.
Fig. 1 is structural representation of the present invention.
In figure, 1 low-pressure heater entrance inlet valve, 2 low-pressure heater outlet inlet valves, 3 water inlet check-valves, 4 boosters, 5 low low-level (stack-gas) economizer inlet channels, 6 low low-level (stack-gas) economizer high temperature section, 6-1 low low-level (stack-gas) economizer high temperature section entrance header, 6-2 low low-level (stack-gas) economizer high temperature section outlet header, 7 low low-level (stack-gas) economizer water return pipelines, 8 low low-level (stack-gas) economizer water return pipeline valves, 9 low low-level (stack-gas) economizer low-temperature zone, 9-1 low low-level (stack-gas) economizer low-temperature zone entrance header, 9-2 low low-level (stack-gas) economizer low-temperature zone outlet header, 10 circulating pumps, 11 low low-level (stack-gas) economizer low-temperature zone outlet conduits, 12 Secondary Air steam air heaters, 13 Secondary Air steam air heater entrance headers, 14 Secondary Air steam air heater outlet headers, 15 First air steam air heaters, 16 First air steam air heater entrance headers, 17 First air steam air heater outlet headers, 18 Secondary Air steam air heater inlet regulating valves, 19 First air steam air heater inlet regulating valves, 20 low low-level (stack-gas) economizer low-temperature zone water return pipelines.
(5) detailed description of the invention
Accompanying drawing is a kind of specific embodiment of the present invention.This embodiment installs low low-level (stack-gas) economizer high temperature section 6 before electrostatic precipitator in flue, be exported in desulfurizing tower gas approach at air-introduced machine and low low-level (stack-gas) economizer low-temperature zone 9 is installed, in an air channel, First air steam air heater 15 is set, Secondary Air steam air heater 12 is set in secondary air duct, low low-level (stack-gas) economizer high temperature section 6 is connected with condenser condensed water pipeline, low low-level (stack-gas) economizer low-temperature zone 9 is connected in parallel with First air steam air heater 15 and Secondary Air steam air heater 12 respectively by low low-level (stack-gas) economizer low-temperature zone outlet conduit 11, First air steam air heater 15 is communicated with the low low-level (stack-gas) economizer low-temperature zone water return pipeline 20 of low low-level (stack-gas) economizer low-temperature zone 9 with the outlet conduit of Secondary Air steam air heater 12, described low low-level (stack-gas) economizer high temperature section 6 installs booster 4 and water inlet check-valves 3 on low low-level (stack-gas) economizer inlet channel 5, low low-level (stack-gas) economizer inlet channel 5 is communicated with the low-pressure heater of two series connection with low-pressure heater entrance inlet valve 1 by low-pressure heater outlet inlet valve 2, low-pressure heater is communicated with condenser, the low low-level (stack-gas) economizer water return pipeline 7 of low low-level (stack-gas) economizer high temperature section 6 is communicated with oxygen-eliminating device by low low-level (stack-gas) economizer water return pipeline valve 8, described low low-level (stack-gas) economizer high temperature section 6 is provided with low low-level (stack-gas) economizer high temperature section entrance header 6-1 and low low-level (stack-gas) economizer high temperature section outlet header 6-2, low low-level (stack-gas) economizer low-temperature zone 9 is provided with low low-level (stack-gas) economizer low-temperature zone entrance header 9-1 and low low-level (stack-gas) economizer low-temperature zone outlet header 9-2, described First air steam air heater 15 is provided with First air steam air heater entrance header 16 and First air steam air heater outlet header 17, Secondary Air steam air heater 12 is provided with Secondary Air steam air heater entrance header 13 and Secondary Air steam air heater outlet header 14, the outlet pipe of described First air steam air heater 15 is provided with First air steam air heater inlet regulating valve 19, the outlet pipe of Secondary Air steam air heater 12 is provided with Secondary Air steam air heater inlet regulating valve 18, the body of described low low-level (stack-gas) economizer high temperature section 6, low low-level (stack-gas) economizer low-temperature zone 9, First air steam air heater 15 and Secondary Air steam air heater 12 is snake-like tube row, selects " H " type extended surface tube.
Between air preheater and electrostatic precipitator, in flue, cloth sets low low-level (stack-gas) economizer high temperature section 6, high temperature section water intaking is from the import and export of low-pressure heater, be connected with steam turbine condensate line by low low-level (stack-gas) economizer inlet channel 5, regulated the inflow temperature of low low-level (stack-gas) economizer high temperature section 6 by the aperture controlling low-pressure heater entrance inlet valve 1 and low-pressure heater outlet inlet valve 2.System water inlet enters high temperature section body by low low-level (stack-gas) economizer high temperature section entrance header 6-1, enters low low-level (stack-gas) economizer high temperature section outlet header 6-2, then enter oxygen-eliminating device entrance by low low-level (stack-gas) economizer water return pipeline 9 through coiled pipe.
System water route and full-flow condensate are arranged in parallel, and pipeline flow resistance is overcome by booster 4.Low low-level (stack-gas) economizer inlet channel arranges check-valves 3, prevents system water route adverse current.Low low-level (stack-gas) economizer water return pipeline 7 arranges low low-level (stack-gas) economizer water return pipeline valve 8, is convenient to system shutdown.Low low-level (stack-gas) economizer high temperature section 6 body is snake-like tube row, selects " H " type extended surface tube, absorbs fume afterheat and cigarette temperature is reduced to about 90 DEG C.
Low low-level (stack-gas) economizer low-temperature zone 9 is arranged in desulfurizing tower gas approach, forms closed circulation system with First air steam air heater 15, Secondary Air steam air heater 12.First top-off cycle water in system, circulating pump 10 provides circulation power, recirculated water absorbs fume afterheat in low-temperature zone, through low low-level (stack-gas) economizer low-temperature zone outlet header 9-2, low low-level (stack-gas) economizer low-temperature zone outlet conduit 11 enters First air steam air heater entrance header 16 and Secondary Air steam air heater entrance header 13 respectively, flow through First air steam air heater 15 and Secondary Air steam air heater 12 heat release, then First air steam air heater outlet header 17 and Secondary Air steam air heater outlet header 14 is flowed into, after converging, flow into low temperature steam air heater low-temperature zone water return pipeline 20 be back to low low-level (stack-gas) economizer low-temperature zone entrance header 9-1.
Low-level (stack-gas) economizer low-temperature zone 9 body is snake-like tube row, material selection fluorine plastic tube, absorbs fume afterheat and cigarette temperature is reduced to about 50 DEG C.Fluorine plastic tube has stronger decay resistance, can make heating surface permanently effective operation in 50 DEG C of cigarette warm water are flat.Primary and secondary air steam air heater body is snake-like tube row, selects " H " type extended surface tube, absorbs condensate water heat and wind-warm syndrome is brought up to about 60 DEG C.
By controlling the aperture of Secondary Air steam air heater inlet regulating valve 18 and First air steam air heater inlet regulating valve 19, adjustment flows into the water yield of steam air heater, and then control first and second steam air heater outlet wind-warm syndrome, utilize fume afterheat heating boiler primary and secondary air, substitute conventional steam steam air heater.First and second wind-warm syndrome improves, thus makes air preheater export the raising of cigarette temperature, brings up to about 160 DEG C, promotes low low-level (stack-gas) economizer high temperature section cigarette temperature and utilize level, increase low low-level (stack-gas) economizer high temperature section mechanical efficiency and benefit of saving coal.
Low low-level (stack-gas) economizer high temperature section, low-temperature zone and primary and secondary air steam air heater are modular arrangement, often organize module entry and exit pipeline and are equipped with valve, can close corresponding module separately, realize independent start and stop, easy access.
Claims (6)
1. air-supply heat penetration residual neat recovering system combined by the low low-level (stack-gas) economizer of coal unit, it is characterized in that: low low-level (stack-gas) economizer high temperature section (6) is installed in flue before electrostatic precipitator, be exported in desulfurizing tower gas approach at air-introduced machine and low low-level (stack-gas) economizer low-temperature zone (9) is installed, First air steam air heater (15) is set in an air channel, Secondary Air steam air heater (12) is set in secondary air duct, low low-level (stack-gas) economizer high temperature section (6) is connected with condenser condensed water pipeline, low low-level (stack-gas) economizer low-temperature zone (9) is connected in parallel with First air steam air heater (15) and Secondary Air steam air heater (12) respectively by low low-level (stack-gas) economizer low-temperature zone outlet conduit (11), First air steam air heater (15) is communicated with the low low-level (stack-gas) economizer low-temperature zone water return pipeline (20) of low low-level (stack-gas) economizer low-temperature zone (9) with the outlet conduit of Secondary Air steam air heater (12).
2. air-supply heat penetration residual neat recovering system combined by the low low-level (stack-gas) economizer of coal unit according to claim 1, it is characterized in that: described low low-level (stack-gas) economizer high temperature section (6) installs booster (4) and water inlet check-valves (3) on low low-level (stack-gas) economizer inlet channel (5), low low-level (stack-gas) economizer inlet channel (5) exports inlet valve (2) by low-pressure heater and is communicated with two low-pressure heaters of connecting with low-pressure heater entrance inlet valve (1), and low-pressure heater is communicated with condenser; The low low-level (stack-gas) economizer water return pipeline (7) of low low-level (stack-gas) economizer high temperature section (6) is communicated with oxygen-eliminating device by low low-level (stack-gas) economizer water return pipeline valve (8).
3. air-supply heat penetration residual neat recovering system combined by the low low-level (stack-gas) economizer of coal unit according to claim 1, it is characterized in that: described low low-level (stack-gas) economizer high temperature section (6) is provided with low low-level (stack-gas) economizer high temperature section entrance header (6-1) and low low-level (stack-gas) economizer high temperature section outlet header (6-2), low low-level (stack-gas) economizer low-temperature zone (9) is provided with low low-level (stack-gas) economizer low-temperature zone entrance header (9-1) and low low-level (stack-gas) economizer low-temperature zone outlet header (9-2).
4. air-supply heat penetration residual neat recovering system combined by the low low-level (stack-gas) economizer of coal unit according to claim 1, it is characterized in that: described First air steam air heater (15) is provided with First air steam air heater entrance header (16) and First air steam air heater outlet header (17); Secondary Air steam air heater (12) is provided with Secondary Air steam air heater entrance header (13) and Secondary Air steam air heater outlet header (14).
5. air-supply heat penetration residual neat recovering system combined by the low low-level (stack-gas) economizer of coal unit according to claim 1, it is characterized in that: the outlet pipe of described First air steam air heater (15) is provided with First air steam air heater inlet regulating valve (19), the outlet pipe of Secondary Air steam air heater (12) is provided with Secondary Air steam air heater inlet regulating valve (18).
6. air-supply heat penetration residual neat recovering system combined by the low low-level (stack-gas) economizer of coal unit according to claim 1, it is characterized by: the body of described low low-level (stack-gas) economizer high temperature section (6), low low-level (stack-gas) economizer low-temperature zone (9), First air steam air heater (15) and Secondary Air steam air heater (12) is snake-like tube row, selects " H " type extended surface tube.
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| CN110594774A (en) * | 2019-09-12 | 2019-12-20 | 中国电力工程顾问集团西南电力设计院有限公司 | Heating system of air heater at cold end of air preheater of thermal power plant |
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| CN113669716A (en) * | 2021-06-29 | 2021-11-19 | 华能国际电力股份有限公司大连电厂 | Low-temperature economizer and drainage recovery coupling water supply system and method |
| CN113669716B (en) * | 2021-06-29 | 2024-03-19 | 华能国际电力股份有限公司大连电厂 | Low-temperature economizer and drainage recovery coupling water supply system and method |
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