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Heat pump evaporation process for recycling flue gas cleaning byproducts

A flue gas purification and heat pump evaporation technology, applied in the field of flue gas purification, can solve the problem that secondary steam cannot be used directly, and achieve the effects of light weight, continuous exhaust and consumption saving

Active Publication Date: 2015-04-08
CHENGDU HUAXITANG INVESTMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The secondary steam of a certain effect of the patented evaporator cannot be directly used as a heat source for this effect, but can only be used as a heat source for a secondary effect or several effects.

Method used

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  • Heat pump evaporation process for recycling flue gas cleaning byproducts
  • Heat pump evaporation process for recycling flue gas cleaning byproducts
  • Heat pump evaporation process for recycling flue gas cleaning byproducts

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] A heat pump evaporation process for recycling flue gas purification by-products. The waste liquid after wet purification of flue gas enters the reactor and reacts with ammonium bicarbonate. After the reaction is completed, the material liquid is separated from solid and liquid, and the liquid is cooled and crystallized. The clear liquid is used as the raw material liquid, pumped into the preheater, the preheated raw material liquid enters the heat exchanger, and is heated by the shell side steam in the tube side of the heat exchanger, and the temperature rises, and the raw material liquid enters under the push of the forced circulation pump Crystallization separator, flash evaporation occurs in the crystallization separator, the raw material liquid is supersaturated and crystallized, and ammonium salt crystals are obtained for recycling; the secondary steam generated by the flash evaporation is compressed by the compressor and enters the shell of the heat exchanger as a h...

Embodiment 2

[0051] This embodiment is basically the same as Embodiment 1, on this basis:

[0052] The solid obtained from the reaction of the waste liquid and ammonium bicarbonate is used as an absorbent and reused in the flue gas purification section.

Embodiment 3

[0054] This embodiment is basically the same as Embodiment 2, on this basis:

[0055] The compressor is a centrifugal compressor.

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Abstract

The invention provides a heat pump evaporation process for recycling flue gas cleaning byproducts. The process is characterized by comprising the following steps: feeding waste liquor subjected to wet cleaning into a reactor to have reaction with ammonium bicarbonate; after the reaction is finished, carrying out solid-liquid separation on feed liquid, cooling and crystallizing liquid to obtain clear liquid serving as raw material liquid, pumping the raw material liquid into a preheater, feeding the preheated raw material liquid into a heat exchanger, heating the raw material liquid by using shell pass steam in a tube pass of the heat exchanger so that the temperature of the raw material liquid is increased; pushing the raw material liquid into a crystal separator by using a forced circulation pump, performing flash evaporation in the crystal separator so that the raw material liquid is supersaturated and crystallized to obtain ammonium salt crystals which can be recycled; compressing secondary steam (generated by flash evaporation) by a compressor and feeding the compressed secondary steam serving as a heat source into the shell pass of the heat exchanger. The process is particularly suitable for processing sodion waste liquid generated after flue gas desulfurization and denitration and the aims of changing waste material into things of value is achieved and steam consumption is reduced.

Description

technical field [0001] The invention relates to the technical field of flue gas purification, in particular to a heat pump evaporation process for recycling flue gas purification by-products. Background technique [0002] In recent years, as air pollution has become more and more serious, people have put forward higher requirements for the treatment of flue gas, especially coal-fired flue gas; In accordance with the "Emission Standards for Substances" (GB13223-2011), new emission limits for soot, sulfur dioxide, and nitrogen oxides in flue gas have been put forward. At present, the effective methods of flue gas desulfurization are wet flue gas desulfurization such as ammonia method and sodium method. The above desulfurization methods all produce a certain concentration of waste liquid containing sulfate and nitrate. It has the characteristics of high salt content and partial acidity, and the effluent quality is difficult to meet the discharge standard when treated by ordin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C01C1/24
CPCY02B30/52Y02P20/129
Inventor 汪然陈洪会汤茂辉黄炳光郎治
Owner CHENGDU HUAXITANG INVESTMENT
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