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Desulphurization method for acid gas

An acid gas and air technology, applied in the field of acid gas desulfurization process, can solve the problems of inappropriate addition of ammonia recovery devices, increase the burden of water treatment and operating costs, and achieve the effects of saving investment and operating costs, short process flow and simple operation

Inactive Publication Date: 2009-11-11
BEIJING FUNGHAN ENG CONSULTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way, it is necessary to perform ammonia washing pretreatment on the acid gas first, and the ammonia-containing wastewater after ammonia washing is generally discharged to the water treatment center of the factory, which increases the burden of water treatment and operating costs of the factory, and the ammonia-containing wastewater is recovered separately Refining, generally due to the small amount of ammonia, it is not suitable to increase the ammonia recovery device

Method used

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  • Desulphurization method for acid gas
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  • Desulphurization method for acid gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] figure 1 It is a schematic flow chart of the acid gas desulfurization process described in the present invention. Such as figure 1 Shown, acid gas 1 and scrubbing liquid 2 from pipeline enter ammonia scrubbing device 3 and the ammonia in acid gas is washed off, and the scrubbing rate to ammonia (the weight percent of the ammonia in the washed ammonia and acid gas) can be 1-99%, if the acid gas does not contain ammonia, the ammonia washing device 3 can be canceled, and in this case the ammonia required in the inventive process can be purchased or come from other devices in the factory. The washing liquid 2 can be demineralized water. The liquid part of the ammonia washing device 3 is the waste water 4 containing ammonia and a small amount of hydrogen sulfide, which goes to the absorbing device 22 for washing sulfur dioxide for sulfur dioxide absorption and washing. The gas 5 from the ammonia washing device 3 enters the acid gas combustion device 7 . Ammonia, hydrogen...

Embodiment 2

[0075] The process is the same as in Example 1, except that the acid gas in the pipeline does not contain ammonia, and the ammonia washing device 3 is omitted.

[0076] The composition of the acid gas in the pipeline is as follows:

[0077]

[0078]

[0079] The acid gas enters the combustion device, the acid gas entering the main burner is 5%, the combustion temperature is 500°C, the acid gas entering the main combustion chamber is 95%, the combustion temperature is 950°C, and the required catalyst amount is: 3.9M 3 , the catalytic reduction temperature is 210°C, and the incineration temperature is 1200°C. After combustion and catalytic reaction, 506.4kg / h of sulfur is obtained, including 1084kg / h of SO 2 Absorbed by ammonia, the concentration of purchased ammonia water is 20%, the temperature for eluting sulfur dioxide is 50°C, the spray pressure is 0.8MPa, the vacuum degree used by the falling film evaporator is 0.06MPa, and finally ammonium sulfate is generated at 22...

Embodiment 3

[0082] The process is the same as in Example 1, except that the acid gas in the pipeline does not contain ammonia, and the ammonia washing device 3 is omitted.

[0083] The composition of the acid gas in the pipeline is as follows:

[0084]

[0085] The acid gas enters the combustion device, the acid gas entering the main burner is 90%, the combustion temperature is 980°C, the acid gas entering the main combustion chamber is 10%, the combustion temperature is 750°C, and the required catalyst amount is: 2.8M 3 , the catalytic reduction temperature is 230°C, and the incineration temperature is 800°C. After combustion and catalytic reaction, 572.6kg / h of sulfur is obtained, including 2745kg / h of SO 2 Absorbed by ammonia, the concentration of purchased ammonia water is 20%, the temperature when eluting sulfur dioxide is 10°C, the spray pressure is 1.5MPa, the vacuum degree used by the falling film evaporator is 0.01MPa, and finally produces ammonium sulfate 5661.8kg / h .

[00...

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Abstract

The invention provides a desulphurization method for acid gas, which comprises the following steps: firstly, carrying out heat combustion reaction on the acid gas and fuel in a combustion chamber; secondly, carrying out catalytic reduction reaction on the obtained combustion product; thirdly, combusting tail gas obtained by the catalytic reduction reaction; and fourthly, carrying out ammonia elution on sulfur dioxide in gas obtained after combustion to obtain ammonium sulphate. The desulphurization combined process for the acid gas has no strict requirement on the Claus combustion, does not need multistage Claus reaction, and even does not control the Claus reaction strictly; and wastewater subjected to ammonia washing in the acid gas containing ammonia is not discharged to a sewage treatment center of a factory, and a fussy device is not needed to add for ammonium refining and recovery. The method can balance the ammonia and the Clause reaction according to the yield of the ammonium sulphate, and does not have sewage discharge; heat required by the process can be balanced through by-product steam, so that the method greatly saves the investment and operation cost, and has short flow and simple operation; and the gas emission can be far lower than the national emission standard.

Description

technical field [0001] The invention relates to an acid gas desulfurization process, in particular to a process for producing ammonium sulfate from sulfur dioxide after burning acid gas, recovering sulfur elastically, and burning sulfur dioxide. Background technique [0002] The conventional acid gas desulfurization process is to control the acid gas or concentrated acid gas through strict air and acid gas ratio control (such as controlling the H at the outlet of the third-stage catalytic reactor. 2 The concentration of S is 0.6% (volume ratio)) to conduct high-temperature Claus combustion to obtain sulfur dioxide and convert the sulfur dioxide into elemental sulfur, which is finally incinerated and discharged. This process generally includes ordinary Claus, super Claus, super excellent Claus and Scote, etc., with large investment and high operating costs. The main method generally requires a multi-stage Claus reaction and can also meet the national emission standards by ad...

Claims

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Application Information

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IPC IPC(8): B01D53/48B01D53/75F23G7/06
Inventor 王威徐耀武宋夕平王伟
Owner BEIJING FUNGHAN ENG CONSULTING
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