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Process for ammonia method desulfurization of fume and by-producing ammonium sulfite

A technology for by-product ammonium sulfite and ammonia desulfurization, which is applied in ammonium sulfite, separation methods, chemical instruments and methods, etc., can solve the problems of unattainable desulfurization, low desulfurization efficiency, ammonia pollution, etc.

Active Publication Date: 2009-05-13
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Through the introduction of the above various desulfurization methods, it can be seen that ammonia desulfurization has obvious advantages, but the current ammonia desulfurization generally has the problem of conflicting desulfurization efficiency and ammonia loss
That is, when the desulfurization efficiency is high, the ammonia content in the purified tail gas is also high, which is likely to cause ammonia pollution, increase the loss of ammonia, and increase the cost of desulfurization
When the ammonia loss is small, the desulfurization efficiency is low, and the purpose of desulfurization cannot be achieved

Method used

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  • Process for ammonia method desulfurization of fume and by-producing ammonium sulfite

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Effect test

Embodiment 1

[0020] Simulated flue gas composition: 78% N 2 , 18% CO 2 , 2% O 2 , 1000ppm of SO 2 and water vapor. Simulated flue gas flow: 1m 3 / min, ammonia flow: 15ml / min, (NH 4) 2 SO 3 The circulation volume of the solution: 200ml / min, the concentration of ammonia water: 10%, the (NH 4 ) 2 SO 3 Solution concentration (the same below): 10%.

[0021] Experimental results:

[0022] Flue gas flow

Embodiment 2

[0024] Simulated flue gas composition: 78% N 2 , 18% CO 2 , 2% O 2 , 2000ppm of SO 2 and water vapor.

[0025] Simulated flue gas flow: 1m 3 / min, ammonia flow: 30ml / min, (NH 4 ) 2 SO 3 Solution circulation volume: 300ml / min, ammonia concentration: 10%, (NH 4 ) 2 SO 3 Solution concentration: 10%.

[0026] Experimental results:

[0027] Flue gas flow

Embodiment 3

[0029] Simulated flue gas composition: 78% N 2 , 18% CO 2 , 2% O 2 , 1000ppm of SO 2 and water vapor.

[0030] Simulated flue gas flow: 1m 3 / min, ammonia flow: 10ml / min, (NH 4 ) 2 SO 3 Solution circulation volume: 200ml / min, ammonia concentration: 15%, (NH 4 ) 2 SO 3 Solution concentration: 10%.

[0031] Experimental results:

[0032] Flue gas flow

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Abstract

The invention discloses a flue gas desulfurizing method through ammonia process and generating method of by-product ammonium sulfite, which comprises the following steps: making flue gas into cyclone separator and heat exchanger to dedust and cool; atomizing ammonia and (NH4)2SO3 solution in the drying tower; contacting with flue gas to desulfurize; drying; separating; contacting flue gas with (NH4)2SO3 solution in the spray tower; removing residual SO2 and NH3 to lower density; saving ammonia; obtaining by-product (NH4)2SO3.

Description

technical field [0001] The invention relates to a method for flue gas ammonia desulfurization and by-product ammonium sulfite, belonging to the technical field of flue gas desulfurization and fertilizer production. Background technique [0002] The current desulfurization methods can be divided into two types: disposal method and recovery method according to the disposal method of desulfurization by-products. Disposal methods mainly include wet method, dry method and semi-dry method. Wet desulfurization is to use limestone and lime slurry to absorb SO in the flue gas in the absorption tower 2 , The products are calcium sulfite and calcium sulfate, and its desulfurization efficiency is 75% to 95%. Since both the absorbent and the product are solid, fouling and blockage are prone to occur in the desulfurization equipment and pipelines, and the product has no use and can only be discarded, sometimes causing secondary pollution. Dry desulfurization is to spray the absorbent c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/58C01C1/22
Inventor 刘军齐国庆韩燕
Owner PETROCHINA CO LTD
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