Device combining waste-heat recovery and white elimination with wastewater concentration

A technology for wastewater concentration and waste heat recovery, applied in heat recovery systems, heating water/sewage treatment, gaseous discharge wastewater treatment, etc., can solve problems such as reduced unit efficiency, increased dust removal equipment load, low operating costs, etc., to achieve a good society. and economic impact, reducing the dust content of the flue gas, eliminating the effect of wet plume

Pending Publication Date: 2019-11-01
CHINA HUADIAN ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of steam evaporation can produce recyclable salt and realize the reuse of water in wastewater. The disadvantage is that it is difficult to recycle low-grade salt. The evaporation process requires high-quality steam, which requires high energy consumption, large investment, and high operating requirements.
The flue gas waste heat evaporation scheme has lower investment, lower operating costs, and improved downstream dust removal efficiency. The disadvantage is that it consumes high-quality flue gas waste heat, affects the flue gas temperature of the air preheater, leads to a decrease in unit efficiency, and increases the load on dust removal equipment. , if no concentration reduction is carried out, a large amount of water will enter the desulfurization system, resulting in a decrease in the evaporation of the desulfurization tower, affecting the amount of desulfurization flushing water, and the amount of treated wastewater will also be limited by the flue gas temperature and load
[0004] Due to the above-mentioned waste of energy and water resources and high investment cost in the conventional whitening technology at present, the elimination of wet plume has the problem that only investment has no profit. The desulfurization wastewater concentration technology consumes high-quality heat energy, and has high energy consumption, high investment cost, and operational requirements. High, adverse effects on unit efficiency and other issues

Method used

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  • Device combining waste-heat recovery and white elimination with wastewater concentration
  • Device combining waste-heat recovery and white elimination with wastewater concentration
  • Device combining waste-heat recovery and white elimination with wastewater concentration

Examples

Experimental program
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Effect test

Embodiment 1

[0045] This embodiment provides a device for waste heat recovery and whitening combined with waste water concentration, such as figure 1 , 3 , 4 and 5, the absorption heat pump system includes the air preheater 0, the dust removal unit 1, the economizer 4, the desulfurization unit 3 and the chimney 5 which are connected in sequence, and also includes the first circulation loop and the first circulation loop The first heat exchanger 7 on the top, the liquid inlet end of the first circulation loop communicates with the lower part of the absorption unit 3, and the liquid outlet communicates with the upper part of the absorption unit 3; in this embodiment, the dust removal unit 1 is an electric precipitator, The economizer 4 is a low-temperature economizer, and the desulfurization unit 2 is a desulfurization tower; the absorption unit 3 can be an absorption tower, and the absorption tower can be an empty tower or a packed tower. When it is a packed tower, the packing can be single...

Embodiment 2

[0060] This embodiment provides a device for waste heat recovery and whitening combined with waste water concentration, such as figure 2 As shown, on the basis of the above-mentioned embodiment 1, as a variable embodiment, the evaporative drying system is a rotary spray evaporator 22, the upper part of which is provided with a high-temperature dry flue gas inlet, and along the flow direction of the flue gas, the high-temperature dry flue gas The inlet is connected with the upstream flue of the air preheater 0, so that the high-temperature dry flue gas in the upstream flue of the air preheater 0 enters the rotary spray evaporator to exchange heat with the concentrated desulfurization wastewater; specifically, the high-temperature dry flue gas inlet and the air The inlet flue of preheater 0 is connected;

[0061] The lower part of the rotary spray evaporator is provided with a high-temperature wet flue gas outlet, and the high-temperature wet flue gas outlet communicates with t...

Embodiment 3

[0064] This embodiment provides a device for waste heat recovery and whitening combined with waste water concentration. On the basis of the above-mentioned embodiment 1 or 2, it also includes a condenser 18, which communicates with the secondary steam outlet on the upper part of the waste water flash tank 17. The condenser 18 is also communicated with the waste water cooler 19, so that the heat exchange medium from the raised temperature in the waste water cooler 19 enters the condenser 18, and exchanges heat again with the secondary steam from the waste water flash tank 17;

[0065] Further, a fourth heat exchanger 10 is also included, which is arranged on the second circulation loop, and is used to exchange heat for the concentrated solution again.

[0066] In the heating season, the intermediate heat medium water exchanges heat with the absorption liquid from the absorber, and the heat network water that exits the first heat exchanger (primary heat exchanger) and enters the ...

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Abstract

The invention discloses a device combining waste-heat recovery and white elimination with wastewater concentration. The device is used for solving the problems of flue gas waste-heat recovery and wastewater concentration in a power plant, and is composed of an absorption heat pump system, a wastewater concentration system, an evaporation drying system and the like. According to the device providedby the invention, the flue gas waste heat in a coal-fired power plant or other industries is utilized for wastewater concentration, the concentration process has little influence on the flue gas humidity, wastewater is turned into available water, and finally recycled flue gas heat is transmitted to a low-pressure heater system to realize gradient utilization of heat energy; and the concentratedand reduced high-concentration wastewater can be conveyed to the evaporation drying system, so that heat required by the evaporation drying system is greatly reduced, the influence on a unit is reduced, and the whole system has the advantages of low energy consumption, low investment, low operating costs and the like.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and specifically relates to a device for waste heat recovery and whitening combined with waste water concentration, in particular to a device for deep recovery of waste heat from flue gas in a thermal power plant, elimination of wet smoke plume, water collection, and waste water treatment or in other fields. A method and device for deep recovery of gas waste heat, elimination of wet plume, water collection and wastewater treatment. Background technique [0002] At present, the mainstream technology for eliminating wet plume is to arrange the flue gas condenser, spray tower after the desulfurization tower, or add a slurry cooler on the slurry circulation slurry pipe to cool down the flue gas at the outlet of the desulfurization tower to precipitate moisture, and use the original flue gas Waste heat is used to heat the clean flue gas. This type of technology not only cannot deeply ...

Claims

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Application Information

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IPC IPC(8): B01D53/18B01D53/14B01D53/26C02F9/10C02F103/18
CPCB01D53/18B01D53/1425B01D53/1412B01D53/263C02F1/06C02F1/16C02F1/12C02F2303/10C02F2103/18C02F2001/007C02F2301/08B01D2259/65B01D2258/0283B01D2257/80Y02B30/52
Inventor 王争荣沈明忠汪洋苏军划胡小夫耿宣夏怀鹏沈建永李伟王桦
Owner CHINA HUADIAN ENG
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