CN101362050A - Flue-gas residual heat utilization device of wet desulfurization system - Google Patents
Flue-gas residual heat utilization device of wet desulfurization system Download PDFInfo
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- CN101362050A CN101362050A CNA2007100704508A CN200710070450A CN101362050A CN 101362050 A CN101362050 A CN 101362050A CN A2007100704508 A CNA2007100704508 A CN A2007100704508A CN 200710070450 A CN200710070450 A CN 200710070450A CN 101362050 A CN101362050 A CN 101362050A
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Abstract
The invention relates to a device for utilizing flue gas waste heat in a wet desulfurization system, which realizes multilevel spraying in flues. A flue behind a booster fan and in front of a desulfurization tower is taken as a spraying and heat exchange device; circulating water goes through multilevel reverse spraying and absorbs the flue gas waste heat, which causes the temperature of the water to rise to be close to saturation temperature; then by indirect heat exchange, the heat is transmitted to condensate coming from a condenser. The cooled water is treated with circulation spraying and heat absorption again so as to continuously transmit the flue gas waste heat to the condensate to reach the purpose of energy conservation.
Description
Affiliated technical field
The present invention relates to a kind of fume afterheat use device, enter the energy saver of the boiler of power plant fume afterheat before the desulfurizing tower in particular for the recovery of wet desulfurization system.
Background technology
In the existing power plant boiler wet method desulphurization system, gas-to-gas heat exchanger is generally all adopted in the utilization of fume afterheat, place between booster fan and the desulfurizing tower, the cold flue gas of coming out with the hot flue gas heating desulfurizing tower of boiler emission, thus reduce the corrosion and the lifting flue gas diffusion height of flue gas after desulfurization.But this residual heat using device is not energy-conservation, because of flue gas resistance increases the energy consumption of booster fan is increased greatly on the contrary.Therefore, there is increasing wet desulfurization system to cancel gas-to-gas heat exchanger now.For the safety of desulfurizing tower, can only be before flue gas enters desulfurizing tower spray desuperheating, drop to below 100 ℃ from 120-140 ℃.Because the time of contact of desuperheating water and flue gas is short, and usefulness is normal-temperature water, and spray afterwards water temperature has only about 50 ℃, can't utilize.Therefore, the fume afterheat of the desulphurization system of those no gas-to-gas heat exchangers all wastes now.Conventional spray cooling UTILIZATION OF VESIDUAL HEAT IN technology adopts the water temperature after the single-stage spray improves spray, require spray column very tall and big, thereby investment is big, needs bigger place and space, and this is unconformable for large-sized station boiler, thereby is not applied.
Summary of the invention
In order to overcome the deficiency of the tower spray cooling residual heat using device of existing spray, the residual heat from boiler fume of wet desulfurization system is utilized effectively, the invention provides a kind of fume afterheat use device of chimney flue type, it serves as the spray heat exchanging segment with the flue after the booster fan, before the inlet of absorption tower, multistage reverse spray by water, water temperature is improved step by step, near saturation temperature; By heat exchanger, heating is from the condensed water of condenser simultaneously, thereby the low-pressure pumping steam of minimizing turbine system increases generated energy, reaches energy-conservation purpose.
Technical scheme of the present invention is: in the vertical gas pass and the horizontal flue before the desulfurizing tower after booster fan, arrange the shower of three groups of band nozzles, backmost the one-level spray near the desulfurizing tower inlet is the make-up water spray, the horizontal flue leading portion is the recirculated water spray, enter the third level spray of vertical gas pass after two water converge, realize multistage reverse spray.The water near saturation temperature behind the spray passes through a circulating pump, enters a corrosion resistant heat exchanger, the condensed water of heat transferred from condenser.The most of recirculation spray of recirculated water after the heat exchange, small part enters in the desulfurizing tower.
The invention has the advantages that:
1. existing flue only need just can be used as the space of residual heat collection through transforming, and has omitted spray column, saves the space, reduce investment outlay, but and extensive use.
2. by multistage reverse spray, obtain the highest water temperature, realize effective utilization of wet desulphurization fume afterheat, energy-conservation significantly.
3. match with wet desulphurization, the water treatment at rear portion and flue gas are handled and are all finished by desulphurization system, and system is simple, reduced investment.
Description of drawings
Fig. 1 is a system schematic of the present invention.
In Fig. 1,1. hot flue gas, 2. emergency spray pipe, 3. flue, 4. three grades of showers, 5. valve, 6. make-up pipe, 7. one-level shower, 8. demister, 9. secondary shower, 10. cold flue gas, 11. drainpipes, 12. upper flumes, 13. water-blaster, 14. heat exchangers, 15. condensed water booster pumps, 16. water circulating pump, 17. lower flumes, 18. flushing adjustable pipes.
The specific embodiment
As shown in Figure 1, wet desulphurization fume afterheat use device is made up of flue (3), circulation, makeup Water System, condensate system, heat exchanger (14) etc.Flue system comprises flue body (3) and demister (8), and demister (8) is collected the water droplet that carries in the flue gas with the inertial separation principle.Circulation comprises water circulating pump (16), upper flume (12), lower flume (17), secondary shower (9), three grades of showers (4), water-blaster (13), corresponding pipeline and the valve etc. of anti-cavitation.Makeup Water System comprises make-up pipe (6), make-up water shower (7), emergency spray pipe (2), corresponding pipeline and valve etc.Condensate system comprises condensed water force (forcing) pump (15), pipeline valve etc.Heat exchanger (14) is detachable corrosion resistant plate type heat exchanger.The part that all contact with flue gas and recirculated water all adopts the resistant material manufacturing or carries out preservative treatment.
The workflow of wet desulphurization fume afterheat use device is: from the hot flue gas (1) of booster fan, through the third level spray (4) of vertical gas pass, heat transferred recirculated water, it is the highest that water temperature is risen to.The flow through second level spray (9) of horizontal flue of flue gas after cooling once carries out reducing temperature twice, and the temperature of shower water is improved.Flue gas then through the first order spray (7) of make-up water, temperature is further descended, and the make-up water of normal temperature obtains preheating.Flue gas after three grades of coolings dewaters through demister (8), becomes cold flue gas (10) and enters in the desulfurizing tower.Recirculated water after make-up water after the spray preheating then sprays with secondary imports in the upper flume (12), by a water-blaster (13) injection to third level shower (4), through third level spray, water temperature is increased near saturation temperature, import lower flume (17), water circulating pump (16) through the anti-cavitation of jetting boosts, enter cooling in the plate type heat exchanger (14), cooled recirculated water small part enters desulfurizing tower through drainpipe (11), major part enters in second level spray (9) and the water-blaster (13), circulates.Then in plate type heat exchanger (14), absorb the heat of recirculated water from the condensed water of condenser, heat up, enter in the low level heater of turbine system after condensed water force (forcing) pump (15) boosts.When the circulated sprinkling system breaks down, open the valve (5) of emergency spray pipe (2), the ejection make-up water is controlled at below 100 ℃ the flue-gas temperature that enters flue, with the safety of protection residual heat using device.
Claims (2)
1. wet desulfurization system fume afterheat use device, place after the booster fan of boiler of power plant desulphurization system flue section before the desulfurizing tower inlet, be made up of spray system and heat exchanger etc., flue gas is earlier heat transferred recirculated water, recirculated water is again the heat transferred condensed water, and constantly circulation.It is characterized in that: be the spray space with the flue, recirculated water is through multistage reverse spray, and temperature improves step by step, circulation heat absorption and heat release.
2. wet desulphurization fume afterheat use device according to claim 1 is characterized in that: circulation only needs a circulating pump and a water-blaster, just can realize the multi-stage spray circulation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100704508A CN101362050A (en) | 2007-08-07 | 2007-08-07 | Flue-gas residual heat utilization device of wet desulfurization system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100704508A CN101362050A (en) | 2007-08-07 | 2007-08-07 | Flue-gas residual heat utilization device of wet desulfurization system |
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| Publication Number | Publication Date |
|---|---|
| CN101362050A true CN101362050A (en) | 2009-02-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CNA2007100704508A Pending CN101362050A (en) | 2007-08-07 | 2007-08-07 | Flue-gas residual heat utilization device of wet desulfurization system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103272471A (en) * | 2013-04-27 | 2013-09-04 | 高翀 | Desulfuration system and desulfuration technology therefor |
| CN104174274A (en) * | 2014-08-13 | 2014-12-03 | 北京源深节能技术有限责任公司 | Spray packing tower for flue gas waste heat recovery |
| CN107062193A (en) * | 2017-05-27 | 2017-08-18 | 大唐环境产业集团股份有限公司 | A kind of system economized on water for coal-burning power plant's UTILIZATION OF VESIDUAL HEAT IN and desulfurization |
| CN107166418A (en) * | 2017-07-07 | 2017-09-15 | 北京生态经济科技有限公司 | A kind of smoke processing system that drop mist is dehydrated for power plant desulfurization |
| CN107790275A (en) * | 2017-10-19 | 2018-03-13 | 常熟凯弘节能环保科技有限公司 | Flue gas recirculation pipe with cool-down dehumidification function |
-
2007
- 2007-08-07 CN CNA2007100704508A patent/CN101362050A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103272471A (en) * | 2013-04-27 | 2013-09-04 | 高翀 | Desulfuration system and desulfuration technology therefor |
| CN103272471B (en) * | 2013-04-27 | 2016-03-16 | 高翀 | Desulphurization system and sulfur removal technology thereof |
| CN104174274A (en) * | 2014-08-13 | 2014-12-03 | 北京源深节能技术有限责任公司 | Spray packing tower for flue gas waste heat recovery |
| CN104174274B (en) * | 2014-08-13 | 2016-02-10 | 北京源深节能技术有限责任公司 | For the spray packed tower of flue gas waste heat recovery |
| CN107062193A (en) * | 2017-05-27 | 2017-08-18 | 大唐环境产业集团股份有限公司 | A kind of system economized on water for coal-burning power plant's UTILIZATION OF VESIDUAL HEAT IN and desulfurization |
| CN107166418A (en) * | 2017-07-07 | 2017-09-15 | 北京生态经济科技有限公司 | A kind of smoke processing system that drop mist is dehydrated for power plant desulfurization |
| CN107790275A (en) * | 2017-10-19 | 2018-03-13 | 常熟凯弘节能环保科技有限公司 | Flue gas recirculation pipe with cool-down dehumidification function |
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Open date: 20090211 |