CN105417604A - Method and device using fume residual heat to treat desulfurization waste water - Google Patents

Method and device using fume residual heat to treat desulfurization waste water Download PDF

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Publication number
CN105417604A
CN105417604A CN201610031262.3A CN201610031262A CN105417604A CN 105417604 A CN105417604 A CN 105417604A CN 201610031262 A CN201610031262 A CN 201610031262A CN 105417604 A CN105417604 A CN 105417604A
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China
Prior art keywords
desulfurization wastewater
evaporation concentration
fume afterheat
evaporation
utilize
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Application number
CN201610031262.3A
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Chinese (zh)
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CN105417604B (en
Inventor
王旭东
李锐
张占梅
王泽馨
胡蓉
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National electric investment group Yuanda water Co., Ltd.
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CHONGQING YUANDA WATER SERVICE Co Ltd
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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/02Treatment of water, waste water, or sewage by heating
    • C02F1/04Treatment of water, waste water, or sewage by heating by distillation or evaporation
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/02Treatment of water, waste water, or sewage by heating
    • C02F1/04Treatment of water, waste water, or sewage by heating by distillation or evaporation
    • C02F1/10Treatment of water, waste water, or sewage by heating by distillation or evaporation by direct contact with a particulate solid or with a fluid, as a heat transfer medium
    • C02F1/12Spray evaporation
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/52Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F2001/5218Crystallization
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/18Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents

Abstract

The invention provides a device using fume residual heat to treat desulfurization waste water, which comprises a boiler, an air preheater, an electric deduster, a desulfurization tower and a chimney. The device is characterized in that an evaporation condensing device is arranged between the electric deduster and the desulfurization tower; a condensed desulfurization waste water collecting tank is arranged at the bottom of the evaporation condensing device; a pipeline and a water pump II are arranged at the desulfurization waste water tank and the evaporation condensing device; a nozzle is added in a smoke lane between the air preheater and the deduster; a pipeline and a water pump I are arranged between the nozzle and the condensed desulfurization waste water collecting tank. The device has the beneficial effects of saving chemical drugs adopted in a conventional waste water treatment method, overcoming the problems of large spray amount, low fume temperature at the front section of the deduster, high water vapor content, hardening of a polar plate of the deduster of the existing fume residual heat evaporation technology, and achieving real zero emission of the desulfurization waste water.

Description

Utilize method and the device of fume afterheat process desulfurization wastewater
Technical field
The present invention relates to a kind of industrially desulfurized method of wastewater treatment, particularly relate to a kind of method and the device that utilize fume afterheat process desulfurization wastewater.
Background technology
Usually, the treatment process of Coalsteam plant with FGD waste water adopts the chemical processes such as neutralization, flocculation, precipitation to carry out.But due to the special property of fuel-burning power plant desulfurization wastewater, adopt the waste water after chemical process process cannot enter system reuse, and do not reach emission standard, do not meet the actual requirement of energy-conserving and environment-protective.
The absorbing the spray evaporation treatment technology of heat with droplet evaporation there is the significant advantages such as heat exchange is abundant, the used time is short, energy-conservation of development in recent years.Adopt the fume afterheat of boiler tail to carry out spray evaporation process to desulfurization wastewater, obviously there is good prospect.Existingly utilize power-plant flue gas waste heat to carry out one of method of desulfurization wastewater spray evaporation process to be, in boiler back end ductwork, velocity of flue gas is 5 ~ 11m/s and temperature arranges atomizing nozzle in the region of 413K ~ 470K; Utilize water pump to extract desulfurization wastewater, air compressor machine pressurized air, pressurized air and the desulfurization wastewater pressure ratio entered in atomizing nozzle is 0.25 ~ 0.6; Liquid drop speed after atomizing nozzle atomization is 50 ~ 80m/s, and size droplet diameter is less than 50um; Chimney is discharged with flue gas after atomization and vaporization.This treatment process this can save the pharmaceutical chemicals that Conventional waste water treatment process adopts; Overcome the shortcoming that Waste Water Treatment configuration device in existing desulfurization wastewater treatment technology is many, investment is large, running cost is high and equipment repair and maintenance amount is large; Overcome the chlorion impact that corrodibility is large in slant acidity water surrounding; The increase of smoke moisture and the suitable reduction of flue-gas temperature, reduce the ratio resistance of ash in fly-ash separator, improves dust collector efficiency.But also there is several insoluble problem: before the atomizing nozzle 1. owing to gathering fume afterheat is placed in fly-ash separator, in flue gas, smoke content is large, the easy dust stratification in cigarette lane simultaneously; 2., before atomizing nozzle is placed in fly-ash separator, dust collector electrode plate is easily long-pending in dust removal process to be revealed, thus affects efficiency of dust collection; 3. atomizing nozzle is very responsive to system flue-gas temperature, and choose flue-gas temperature in boiler back end ductwork and can only control between 413K-479K, limitation is stronger.4. the flue gas of below acid dew point can not be utilized as evaporation thermal source, and fume afterheat utilizes insufficient.Obviously, prior art utilize fume afterheat process desulfurization wastewater method also exist the easy dust stratification in cigarette lane, limitation comparatively strong, affect efficiency of dust collection and fume afterheat utilizes the problems such as insufficient.
Summary of the invention
For solve the easy dust stratification in cigarette lane that prior art utilizes fume afterheat process desulfurization wastewater method to exist, limitation comparatively by force, affect efficiency of dust collection and fume afterheat utilizes the problems such as insufficient, the present invention proposes a kind of method and the device that utilize fume afterheat process desulfurization wastewater.
The present invention utilizes the method for fume afterheat process desulfurization wastewater, arranges an evaporation concentration device between fuel-burning power plant electric precipitator and thionizer; Utilize water pump extraction desulfurization wastewater to enter evaporation concentration device and carry out evaporation concentration process, desulfurization wastewater after concentrated is delivered to the cigarette lane between air preheater and fly-ash separator, desulfurization wastewater after atomization and flue gas directly mix and add cigarette lane, flue gas is entered after moisture evaporation wherein, being caught by fly-ash separator after salinity crystallization enters in flyash, and the evaporation realizing desulfurization wastewater is separated.
Further, the heat exchange mode of the vaporizer of described evaporation concentration equipment employing comprises direct or indirect heat exchange.
Further, the atomization technique of the desulfurization wastewater after concentrated adopts atomizing nozzle atomization, and atomizing type comprises mechanical atomizing or medium atomization.
The present invention utilizes the device of fume afterheat process desulfurization wastewater, comprises, and boiler, air preheater, electric precipitator, thionizer and chimney, is characterized in that, arranges an evaporation concentration device between electric precipitator and thionizer; In the bottom of evaporation concentration device, concentrated desulfurization wastewater collecting tank is set; In desulfurization wastewater pond and evaporation concentration device, pipeline and water pump II are set; Air preheater and and fly-ash separator between cigarette lane in increase nozzle, between nozzle and concentrated desulfurization wastewater collecting tank, pipeline and water pump I are set.
Further, the vaporizer that described evaporation concentration equipment adopts comprises direct heat exchange vaporizer or indirect heat exchange vaporizer.
Further, described nozzle is atomizing nozzle, and atomizing type comprises mechanical atomizing or medium atomization.
The present invention utilizes the method for fume afterheat process desulfurization wastewater and the Advantageous Effects of device to be the pharmaceutical chemicalss that saving Conventional waste water treatment process adopts; Overcome existing fume afterheat evaporation technique spray amount large, fly-ash separator leading portion flue-gas temperature is low, water vapour content is high, cause cigarette lane dust stratification, pole plate of dust remover harden, ash disposal difficulty, and acid dew point raises, problem such as pole plate corrosion aggravation etc., reaches desulfurization wastewater zero release truly.
Accompanying drawing explanation
Accompanying drawing 1 is the schematic diagram that invention utilizes fume afterheat process desulfurization wastewater device.
The method of fume afterheat process desulfurization wastewater and device is utilized to be further described below in conjunction with the drawings and specific embodiments to the present invention.
Embodiment
Accompanying drawing 1 is the schematic diagram that invention utilizes fume afterheat process desulfurization wastewater device, and in figure, 1 is boiler, 2 is electric precipitator, 3 is thionizer, and 4 is chimney, and 5 is water pump I, 6 is concentrated desulfurization wastewater collecting tank, 7 is water pump II, and 8 is desulfurization wastewater pond, and 9 is cigarette lane, 10 is evaporation concentration device, and 11 is air preheater.As seen from the figure, the present invention utilizes the device of fume afterheat process desulfurization wastewater, comprises, and boiler 1, air preheater 11, electric precipitator 2, thionizer 3 and chimney 4, is characterized in that, arranges an evaporation concentration device 10 between electric precipitator 2 and thionizer 3; In the bottom of evaporation concentration device 10, concentrated desulfurization wastewater collecting tank 6 is set; In desulfurization wastewater pond 8, pipeline and water pump II 7 are set with evaporation concentration device 10; Air preheater 11 and and fly-ash separator 2 between cigarette lane 9 in increase nozzle, pipeline and water pump I 5 are set between nozzle and concentrated desulfurization wastewater collecting tank 6.For ensureing heat transfer effect, the vaporizer that described evaporation concentration equipment adopts comprises direct heat exchange vaporizer or indirect heat exchange vaporizer.For ensureing atomizing effect, described nozzle is atomizing nozzle, and atomizing type comprises mechanical atomizing or medium atomization.
The present invention utilizes the method for fume afterheat process desulfurization wastewater, arranges an evaporation concentration device between fuel-burning power plant electric precipitator and thionizer; Utilize water pump extraction desulfurization wastewater to enter evaporation concentration device and carry out evaporation concentration process, desulfurization wastewater after concentrated is delivered to the cigarette lane between air preheater and fly-ash separator, desulfurization wastewater after atomization and flue gas directly mix and add cigarette lane, flue gas is entered after moisture evaporation wherein, being caught by fly-ash separator after salinity crystallization enters in flyash, and the evaporation realizing desulfurization wastewater is separated.Wherein, the heat exchange mode of the vaporizer of described evaporation concentration equipment employing comprises direct or indirect heat exchange; The atomization technique of the desulfurization wastewater after concentrated adopts atomizing nozzle atomization, and atomizing type comprises mechanical atomizing or medium atomization.
The present invention utilizes the method for fume afterheat process desulfurization wastewater and device to set up one section of device utilizing low-temperature flue gas to concentrate desulfurization wastewater, change the decoration form of fume afterheat collection point, after make use of fly-ash separator, temperature concentrates at the fume afterheat of 353K ~ 403K, improves the utilization ratio of fume afterheat.After concentrating unit is positioned at fly-ash separator, cigarette lane not easily dust stratification, thus avoid cigarette lane dust stratification, the long-pending dew of pole plate of dust remover.Before desulfurization wastewater recycling fly-ash separator after concentrated, the fume afterheat of 403K ~ 470K carries out evaporation separation, finally realizes the zero release of desulfurization wastewater.The method adopts partial concentration to the process of means of flue gas desulfurization of power plant waste water, can regulate, when fume afterheat temperature reaches desired temperature, then carry out spray evaporation process according to the change of power plant load, and can adapt to the different working condition of power plant, maneuvering ability is stronger.
Obviously, the present invention utilizes the method for fume afterheat process desulfurization wastewater and the Advantageous Effects of device to be the pharmaceutical chemicalss that saving Conventional waste water treatment process adopts; Overcome existing fume afterheat evaporation technique spray amount large, fly-ash separator leading portion flue-gas temperature is low, water vapour content is high, cause cigarette lane dust stratification, pole plate of dust remover harden, ash disposal difficulty, and acid dew point raises, problem such as pole plate corrosion aggravation etc., reaches desulfurization wastewater zero release truly.
The foregoing is only the preferred embodiments of the present invention; be not limited to the present invention, for a person skilled in the art, within the spirit and principles in the present invention all; any amendment of doing, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (6)

1. utilize a method for fume afterheat process desulfurization wastewater, it is characterized in that, an evaporation concentration device is set between fuel-burning power plant electric precipitator and thionizer; Utilize water pump extraction desulfurization wastewater to enter evaporation concentration device and carry out evaporation concentration process, desulfurization wastewater after concentrated is delivered to the cigarette lane between air preheater and fly-ash separator, desulfurization wastewater after atomization and flue gas directly mix and add cigarette lane, flue gas is entered after moisture evaporation wherein, being caught by fly-ash separator after salinity crystallization enters in flyash, and the evaporation realizing desulfurization wastewater is separated.
2. utilize the method for fume afterheat process desulfurization wastewater according to claim 1, it is characterized in that, the heat exchange mode of the vaporizer that described evaporation concentration equipment adopts comprises direct or indirect heat exchange.
3. utilize the method for fume afterheat process desulfurization wastewater according to claim 1, it is characterized in that, the atomization technique of the desulfurization wastewater after concentrated adopts atomizing nozzle atomization, and atomizing type comprises mechanical atomizing or medium atomization.
4. utilize a device for fume afterheat process desulfurization wastewater, it is characterized in that, this device comprises, and boiler, air preheater, electric precipitator, thionizer and chimney, is characterized in that, arranges an evaporation concentration device between electric precipitator and thionizer; In the bottom of evaporation concentration device, concentrated desulfurization wastewater collecting tank is set; In desulfurization wastewater pond and evaporation concentration device, pipeline and water pump II are set; Air preheater and and fly-ash separator between cigarette lane in increase nozzle, between nozzle and concentrated desulfurization wastewater collecting tank, pipeline and water pump I are set.
5. utilize the device of fume afterheat process desulfurization wastewater according to claim 4, it is characterized in that, the vaporizer that described evaporation concentration equipment adopts comprises direct heat exchange vaporizer or indirect heat exchange vaporizer.
6. utilize the device of fume afterheat process desulfurization wastewater according to claim 4, it is characterized in that, described nozzle is atomizing nozzle, and atomizing type comprises mechanical atomizing or medium atomization.
CN201610031262.3A 2016-01-18 2016-01-18 Utilize the method and device of fume afterheat processing desulfurization wastewater Active CN105417604B (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105854599A (en) * 2016-05-20 2016-08-17 福建龙净环保股份有限公司 Synergistic flue gas treatment system and method
CN105967253A (en) * 2016-05-23 2016-09-28 南京奥能科技有限公司 Evaporation process and device of desulfurized wastewater cooling tower
CN106477794A (en) * 2016-11-16 2017-03-08 重庆大学 Desulfurization wastewater concentration and the System and method for of flue gas drying integrated treatment
CN108147491A (en) * 2017-11-29 2018-06-12 金华市纳德棠生物科技有限公司 A kind of wastewater zero discharge equipment
CN109110846A (en) * 2018-08-22 2019-01-01 盛发环保科技(厦门)有限公司 A kind of desulfurization wastewater flue gas concentration decrement and cement fixed system and technique
CN110156099A (en) * 2018-03-27 2019-08-23 新疆环境工程技术有限责任公司 A kind of desulfurization wastewater fume afterheat evaporative crystallization zero-emission integrated approach
CN110433609A (en) * 2019-07-12 2019-11-12 华北电力大学(保定) A kind of Desulphurization for Coal-fired Power Plant wastewater zero discharge and flue gas disappear the method and device of white coupling processing

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JPS5474297A (en) * 1977-11-25 1979-06-14 Unitika Ltd Treatment of recovered sulfur oxide from exhaust gas
JPS5681177A (en) * 1979-12-05 1981-07-02 Kawasaki Heavy Ind Ltd Method and apparatus for treating waste liquid containing heavy metal etc.
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CN105854599A (en) * 2016-05-20 2016-08-17 福建龙净环保股份有限公司 Synergistic flue gas treatment system and method
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CN106477794B (en) * 2016-11-16 2019-04-30 重庆大学 The System and method for of desulfurization wastewater concentration and flue gas drying integrated treatment
CN108147491A (en) * 2017-11-29 2018-06-12 金华市纳德棠生物科技有限公司 A kind of wastewater zero discharge equipment
CN110156099A (en) * 2018-03-27 2019-08-23 新疆环境工程技术有限责任公司 A kind of desulfurization wastewater fume afterheat evaporative crystallization zero-emission integrated approach
CN109110846A (en) * 2018-08-22 2019-01-01 盛发环保科技(厦门)有限公司 A kind of desulfurization wastewater flue gas concentration decrement and cement fixed system and technique
CN110433609A (en) * 2019-07-12 2019-11-12 华北电力大学(保定) A kind of Desulphurization for Coal-fired Power Plant wastewater zero discharge and flue gas disappear the method and device of white coupling processing

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Patentee after: National electric investment group Yuanda water Co., Ltd.

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