CN103353120A - System for recycling afterheat and condensed water of desulfurized tail flue gas - Google Patents

System for recycling afterheat and condensed water of desulfurized tail flue gas Download PDF

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Publication number
CN103353120A
CN103353120A CN2013102294236A CN201310229423A CN103353120A CN 103353120 A CN103353120 A CN 103353120A CN 2013102294236 A CN2013102294236 A CN 2013102294236A CN 201310229423 A CN201310229423 A CN 201310229423A CN 103353120 A CN103353120 A CN 103353120A
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China
Prior art keywords
heat exchanger
condensing heat
condensed water
flue gas
condensing
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Pending
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CN2013102294236A
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Chinese (zh)
Inventor
王自宽
梁志福
谭厚章
张方炜
牛问哲
李英伟
边广平
冯润富
张利清
刘羽平
孙所清
李佩
陈海霞
王廷
王广戌
熊英莹
詹扬
彭红文
王德义
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NORTHERN UNITED POWER CO Ltd
Xian Jiaotong University
North China Electric Power Design Institute of China Power Engineering Consulting Group Corp
Inner Mongolia Shangdu Power Generation Co Ltd
Original Assignee
NORTHERN UNITED POWER CO Ltd
Xian Jiaotong University
North China Electric Power Design Institute of China Power Engineering Consulting Group Corp
Inner Mongolia Shangdu Power Generation Co Ltd
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Publication date
Application filed by NORTHERN UNITED POWER CO Ltd, Xian Jiaotong University, North China Electric Power Design Institute of China Power Engineering Consulting Group Corp, Inner Mongolia Shangdu Power Generation Co Ltd filed Critical NORTHERN UNITED POWER CO Ltd
Priority to CN2013102294236A priority Critical patent/CN103353120A/en
Publication of CN103353120A publication Critical patent/CN103353120A/en
Pending legal-status Critical Current

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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00Combustion technologies with mitigation potential
    • Y02E20/30Technologies for a more efficient combustion or heat usage

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  • Treating Waste Gases (AREA)

Abstract

The invention discloses a system for recycling afterheat and condensed water of desulfurized tail flue gas. The system for recycling the afterheat and the condensed water of the desulfurized tail flue gas comprises a first condensing heat exchanger and a second condensing heat exchanger which are arranged on a desulphurizing tower outlet flue, wherein an efficient defogger is arranged behind the second condensing heat exchanger; a circulating cooling water pump is connected onto the second condensing heat exchanger; a cooling water outlet is connected onto the first condensing heat exchanger; condensed water recyclers are connected to the bottoms of the first condensing heat exchanger, the second condensing heat exchanger and the efficient defogger respectively; cooling water conveyed by the circulating cooling water pump enters the second condensing heat exchanger from the upper part, of the second condensing heat exchanger to be in a countercurrent contact with desulfurized flue gas for heat exchange, is drained from the cooling water outlet on the first condensing heat exchanger, and is finally drained through the efficient defogger. The system can be used for recycling the afterheat and the condensed water of the desulfurized tail flue gas in a power plant, so that the system has a great significance in water conservation and energy conservation of the power plant.

Description

A kind of desulfurization tail smoke waste heat and condensed water recovering system
Technical field
The invention belongs to the energy-conserving and environment-protective field, be specifically related to a kind of desulfurization tail smoke waste heat and condensed water recovering system.
Background technology
In the sulfur method of power plant, the wet desulfurization system investment is lower, the about 1.6-1.8 hundred million of Limestone-gypsum Wet Flue Gas Desulfurization Process 2 * 600MW unit expense, and desulfuration efficiency is very high.And 2 * 600MW unit active coke dry-method desulfuration expense is roughly 7-8 hundred million, and desulfuration efficiency is on the low side.Dry area in north china is owing to the restriction of water index, and the power plant may be forced to adopt dry desulfurization.Therefore, if can decrease wet desulphurization water consumption even reach zero water consumption, also can adopt Wet Flue Gas Desulfurization Technique in the water-deficient area like this, greatly reduce the construction of fire and electricity cost, the thermoelectricity development in the rich coal of lack of water area is had important facilitation.The flue gas after desulfurization water vapor concentration reaches capacity, if at this moment do not take measures, it directly is discharged in the atmosphere, will cause a large amount of steam losses, so the recovery of steam is subject to people's attention gradually.
Summary of the invention
Defective or deficiency for above-mentioned prior art exists the object of the invention is to, and provide and take off a kind of sulphur tail flue gas waste heat and condensed water recovering system.
For achieving the above object, the present invention adopts following technical scheme:
A kind of desulfurization tail smoke waste heat and condensed water recovering system, it is characterized in that, comprise the first condensing heat exchanger and the second condensing heat exchanger arranged on the desulfurizing tower exhaust pass, be furnished with efficient demister after the second condensing heat exchanger, be connected with cooling circulating water pump at the second condensing heat exchanger, be connected with coolant outlet at the first condensing heat exchanger; The first condensing heat exchanger, the second condensing heat exchanger and efficient demister bottom are connected with respectively solidifying water recoverer; The cooling water that cooling circulating water pump is carried enters from the second condensing heat exchanger top, contact with flue gas adverse current after the desulfurization, carries out heat exchange, the coolant outlet discharge from the first condensing heat exchanger; Discharge by efficient demister at last.
Desulfurization tail smoke waste heat of the present invention and condensed water recovering system, be particularly suitable for boiler using brown coal, because the boiler using brown coal exhaust gas volumn is large, economizer and air preheater can not take full advantage of flue gas heat, exhaust gas temperature is higher, not only reduce boiler efficiency, also affected the operation of the auxiliary equipment such as deduster.This desulfurization tail smoke waste heat and condensed water recovering system are arranged in the desulfurizing tower exhaust pass, and the condensing heat exchanger of flowing through of the saturated flue gas after the desulfurization with the cooling water heat exchange, can make flue-gas temperature reduce by 10 ℃, and steam wherein condenses, and can be recycled after the recovery; The heat that flue gas discharges and the latent heat of vaporization of the water vapor condensation water that is cooled absorbs cooling water temperature rise is reached more than 20 ℃, uses as the low-temperature heat source secondary, reduces discharging significant for energy saving for power plants.
Description of drawings
Fig. 1 is desulfurization tail smoke waste heat of the present invention and condensed water recovering system structural representation.
Below in conjunction with drawings and Examples the present invention is described in further detail.
The specific embodiment
Technical thought of the present invention is, installs waste heat and condensed water recovering system additional at the desulfurizing tower exhaust pass, and steam condenses when reducing flue-gas temperature, by special device, moisture can be reclaimed.
Referring to Fig. 1, present embodiment provides the concrete structure of a kind of desulfurization tail smoke waste heat and condensed water recovering system, comprise the first condensing heat exchanger 1 and the second condensing heat exchanger 2 arranged on the desulfurizing tower exhaust pass, be furnished with efficient demister 3 after the second condensing heat exchanger 2, be connected with cooling circulating water pump 4 at the second condensing heat exchanger 2, be connected with coolant outlet at the first condensing heat exchanger 1; The first condensing heat exchanger 1, the second condensing heat exchanger 2 and efficient demister 3 bottoms are connected with respectively solidifying water recoverer 5; The cooling water that cooling circulating water pump 4 is carried enters from the second condensing heat exchanger 2 tops, contact with flue gas adverse current after the desulfurization, carries out heat exchange, the coolant outlet discharge from the first condensing heat exchanger 1; Discharge by efficient demister 3 at last.
In the present embodiment, first, second condensing heat exchanger (1,2) adopts PFA or PTFE or other modified plastics to make, and can prevent the cold end corrosion of flue gas.
Efficient demister 3 adopts the design of gravity impact formula, is made by 316L type corrosion resistant plate, can prevent the cold end corrosion of flue gas.
The first condensing heat exchanger 1, the second condensing heat exchanger 2 are connected solidifying water recoverer 5 with efficient demister 3 by bottom slot, can directly reclaim condensed water.
Cooling circulating water pump 4 is selected Double suction centrifugal water pump.
Its operation principle is:
The saturated flue gas of desulfurizing tower outlet enters desulfurization tail smoke waste heat and condensed water recovering system, successively by condensing heat exchanger (1,2) and efficient demister 3, the cooling water that coolant circulation pump 4 is carried enters from condensing heat exchanger 2 tops, contact with the flue gas adverse current after the desulfurization, carry out heat exchange, final cooling water temperature rise is discharged from the first condensing heat exchanger 1 top more than 20 ℃, reuses as low-temperature heat source.Flue gas is in the heat transfer process of first, second condensing heat exchanger simultaneously, steam in the flue gas is condensed into water droplet, change condensation heat device (2 along first, second, 3) concentrated flow of bottom enters to coagulate water recoverer 5, the water droplet that a part is blown away by flue gas enters to be removed behind the efficient demister 3 and gets off to enter solidifying water recoverer 5, and recycle-water recycles after simple process.
Pilot plant test test through the applicant shows: desulfurization tail smoke waste heat and the condensed water recovering system of present embodiment, saturated flue gas after the desulfurization condensing heat exchanger of flowing through with the cooling water heat exchange, can make flue-gas temperature reduce by 10 ℃, steam wherein condenses, and can be recycled after the recovery; The heat that flue gas discharges and the latent heat of vaporization of the water vapor condensation water that is cooled absorbs cooling water temperature rise is reached more than 20 ℃, uses as the low-temperature heat source secondary.For the 600MW unit, recyclable water 70t/h is equivalent to the wet desulphurization water consumption, if recycle-water is processed the return desulphurization system, can realize desulphurization system zero water consumption; More than recovery waste heat 60,000 kw/h, have huge water saving and energy-saving potential.

Claims (5)

1. a desulfurization tail smoke waste heat and condensed water recovering system, it is characterized in that, comprise the first condensing heat exchanger (1) and the second condensing heat exchanger (2) arranged on the desulfurizing tower exhaust pass, the second condensing heat exchanger (2) is furnished with efficient demister (3) afterwards, be connected with cooling circulating water pump (4) at the second condensing heat exchanger (2), be connected with coolant outlet at the first condensing heat exchanger (1); The first condensing heat exchanger (1), the second condensing heat exchanger (2) and efficient demister (3) bottom are connected with respectively solidifying water recoverer (5); The cooling water that cooling circulating water pump (4) is carried enters from the second condensing heat exchanger (2) top, contact with flue gas adverse current after the desulfurization, carries out heat exchange, the coolant outlet discharge from the first condensing heat exchanger (1); Discharge by efficient demister (3) at last.
2. desulfurization tail smoke waste heat as claimed in claim 1 and condensed water recovering system is characterized in that, described first, second condensing heat exchanger (1,2) adopts PFA or PTFE or other modified plastics to make.
3. desulfurization tail smoke waste heat as claimed in claim 1 and condensed water recovering system is characterized in that: the manufacturing of efficient demister (3) employing 316L type corrosion resistant plate.
4. desulfurization tail smoke waste heat as claimed in claim 1 and condensed water recovering system is characterized in that, described first, second condensing heat exchanger (1,2) is connected solidifying water recoverer (5) with efficient demister (3) by bottom slot.
5. desulfurization tail smoke waste heat as claimed in claim 1 and condensed water recovering system is characterized in that, described cooling circulating water pump (4) is selected Double suction centrifugal water pump.
CN2013102294236A 2013-06-09 2013-06-09 System for recycling afterheat and condensed water of desulfurized tail flue gas Pending CN103353120A (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103691259A (en) * 2013-12-11 2014-04-02 北京中能诺泰节能环保技术有限责任公司 Energy-saving and water-saving purification system for processing smoke by using wet process and energy-saving and water-saving purification process
CN103861420A (en) * 2014-03-14 2014-06-18 北京新世翼节能环保科技股份有限公司 Waste heat recovery condensation water-saving device
CN104832939A (en) * 2015-04-28 2015-08-12 杭州华电能源工程有限公司 System and method for recovering water of smoke based on fluorine plastic heat exchanger
CN105299676A (en) * 2015-09-16 2016-02-03 华北电力大学 Smoke moisture and waste heat recovery device based on hollow micro-nano porous ceramic membranes
CN108569676A (en) * 2018-05-10 2018-09-25 哈尔滨理工大学 Using flue gas as the chemical chain air separation oxygenerator and method of heat source
CN110743327A (en) * 2018-07-23 2020-02-04 国家电投集团远达环保工程有限公司重庆科技分公司 White smoke eliminating system and method
CN110772938A (en) * 2019-11-01 2020-02-11 中冶东方工程技术有限公司 Intensive smoke plume treatment and purification system and method
CN112675673A (en) * 2020-12-11 2021-04-20 浙江菲达环保科技股份有限公司 Wet desulphurization water-saving intelligent regulation control system and method

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1148296A1 (en) * 2000-04-17 2001-10-24 Mitsubishi Heavy Industries, Ltd. Exhaust gas cooling system
CN101140072A (en) * 2007-10-25 2008-03-12 上海外高桥第三发电有限责任公司 Desulfurize flue gas waste heat recovery system used in fire coal electric generating set
CN201293572Y (en) * 2008-11-21 2009-08-19 北京中科正石节能技术有限公司 Flue gas waste heat recovery machine
CN102512929A (en) * 2011-11-23 2012-06-27 西安交通大学 System and method for recycling water vapor and heat in desulfurization tail smoke
EP2505256A1 (en) * 2009-11-25 2012-10-03 Babcock-Hitachi Kabushiki Kaisha Exhaust gas treatment device for an oxygen combustion system
CN102759096A (en) * 2012-07-24 2012-10-31 西安交通大学 Smoke waste heat utilization system
CN102767837A (en) * 2012-07-24 2012-11-07 西安交通大学 System for recovering water contained in flue gas and synchronously removing PM2.5 (Particulate Matter)
CN203384997U (en) * 2013-06-09 2014-01-08 北方联合电力有限责任公司 Recycling system for waste heat and condensates of desulfurization tail flue gas

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1148296A1 (en) * 2000-04-17 2001-10-24 Mitsubishi Heavy Industries, Ltd. Exhaust gas cooling system
CN101140072A (en) * 2007-10-25 2008-03-12 上海外高桥第三发电有限责任公司 Desulfurize flue gas waste heat recovery system used in fire coal electric generating set
CN201293572Y (en) * 2008-11-21 2009-08-19 北京中科正石节能技术有限公司 Flue gas waste heat recovery machine
EP2505256A1 (en) * 2009-11-25 2012-10-03 Babcock-Hitachi Kabushiki Kaisha Exhaust gas treatment device for an oxygen combustion system
CN102512929A (en) * 2011-11-23 2012-06-27 西安交通大学 System and method for recycling water vapor and heat in desulfurization tail smoke
CN102759096A (en) * 2012-07-24 2012-10-31 西安交通大学 Smoke waste heat utilization system
CN102767837A (en) * 2012-07-24 2012-11-07 西安交通大学 System for recovering water contained in flue gas and synchronously removing PM2.5 (Particulate Matter)
CN203384997U (en) * 2013-06-09 2014-01-08 北方联合电力有限责任公司 Recycling system for waste heat and condensates of desulfurization tail flue gas

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103691259A (en) * 2013-12-11 2014-04-02 北京中能诺泰节能环保技术有限责任公司 Energy-saving and water-saving purification system for processing smoke by using wet process and energy-saving and water-saving purification process
CN103861420A (en) * 2014-03-14 2014-06-18 北京新世翼节能环保科技股份有限公司 Waste heat recovery condensation water-saving device
CN104832939A (en) * 2015-04-28 2015-08-12 杭州华电能源工程有限公司 System and method for recovering water of smoke based on fluorine plastic heat exchanger
CN105299676A (en) * 2015-09-16 2016-02-03 华北电力大学 Smoke moisture and waste heat recovery device based on hollow micro-nano porous ceramic membranes
CN108569676A (en) * 2018-05-10 2018-09-25 哈尔滨理工大学 Using flue gas as the chemical chain air separation oxygenerator and method of heat source
CN110743327A (en) * 2018-07-23 2020-02-04 国家电投集团远达环保工程有限公司重庆科技分公司 White smoke eliminating system and method
CN110772938A (en) * 2019-11-01 2020-02-11 中冶东方工程技术有限公司 Intensive smoke plume treatment and purification system and method
CN112675673A (en) * 2020-12-11 2021-04-20 浙江菲达环保科技股份有限公司 Wet desulphurization water-saving intelligent regulation control system and method

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Application publication date: 20131016