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Process for preparing ammonium salt by recycling waste liquid generated by purifying flue gas

A flue gas purification and waste liquid technology, applied in the direction of ammonium nitrate, ammonium sulfate, application, etc., can solve the problem that the secondary steam cannot be used directly, achieve good dust removal effect, small equipment footprint, and reduce occupation The effect of the area

Active Publication Date: 2015-03-25
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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  • Process for preparing ammonium salt by recycling waste liquid generated by purifying flue gas
  • Process for preparing ammonium salt by recycling waste liquid generated by purifying flue gas
  • Process for preparing ammonium salt by recycling waste liquid generated by purifying flue gas

Examples

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Effect test

Embodiment 1

[0060] A process for recovering and utilizing flue gas purification waste liquid to prepare ammonium salts. After flue gas is wet-purified, waste liquid is flocculated, and the clear liquid enters the reactor to react with ammonium bicarbonate. After the reaction is completed, the feed liquid undergoes solid-liquid separation , the clear liquid obtained after liquid cooling and crystallization 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 of the raw material liquid is Driven by the forced circulation pump, it enters the crystallizer, and flashes in the crystallizer, the raw material liquid is supersaturated and crystallized, and the ammonium salt crystals are recovered; the secondary steam generated by the flash is compressed by the compressor and used as The heat source enters the shell side of the heat ...

Embodiment 2

[0062] The implementation mode of this embodiment is basically the same as embodiment 1, on this basis:

[0063] The flocculation refers to: adding the aqueous solution of the composite flocculant to the desulfurization liquid through a pipeline mixer, the desulfurization liquid is flocculated and clarified in the settling tank, the clear liquid enters the lower regeneration process, and the settled sludge is dehydrated. The filtrate is transported outside, and the filtrate is returned to the settling tank for circulation and clarification.

Embodiment 3

[0065] The implementation mode of this embodiment is basically the same as embodiment 2, on this basis:

[0066] The aqueous flocculant solution is prepared from polyacrylamide and sodium polyacrylamide with a mass ratio of 1:3 to form an aqueous solution with a mass fraction of 0.06%.

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Abstract

The invention provides a process for preparing ammonium salt by recycling waste liquid generated by purifying flue gas. The process is characterized by comprising the following steps of flocculating waste liquid generated by the wet purification of the flue gas to obtain a clear liquid, feeding the clear liquid to a reactor to react with ammonium bicarbonate, after the reaction is completed, carrying out solid-liquid separation on a material liquid, cooling and crystallizing the liquid to obtain a clear liquid as a raw material liquid, pumping the raw material liquid into a pre-heater, feeding the preheated raw material liquid into a heat exchanger, heating the preheated raw material by virtue of shell pass steam in a tube pass of the heat exchanger to raise the temperature, feeding the raw material liquid into a crystallization separator under the pushing action of a forced circulation pump, flashing in the crystallization separator, crystallizing the raw material liquid due to supersaturation to obtain ammonium salt crystals for recycling; and compressing secondary steam generated by flashing by virtue of a compressor as a heat source and feeding the compressed secondary steam into the shell pass of the heat exchanger.

Description

technical field [0001] The invention relates to the technical field of flue gas purification, in particular to a process for preparing ammonium salts by recycling flue gas purification waste liquid. 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; Emission Standards for Waste Gases (GB 13223-2011), which puts forward new emission limits for soot, sulfur dioxide, and nitrogen oxides in flue gas. 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 ordinary methods. The de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C1/24C01C1/18C05G1/00
Inventor 李东林汪然汤茂辉黄炳光陈洪会郎治曹静
Owner CHENGDU HUAXITANG INVESTMENT
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