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Treatment method and device of desulfurization tail gas

A treatment method, sulfuric acid tail gas technology, applied in the direction of fertilization equipment, separation methods, chemical instruments and methods, etc., can solve the problems of high power consumption, unstable compounds, etc., achieve energy saving, simple operation, and increase the utilization rate of sulfur Effect

Inactive Publication Date: 2019-03-22
襄阳泽东化工集团股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The solution produced by ammonia desulfurization of pyrite acid tail gas contains ammonium sulfate, ammonium sulfite, and ammonium bisulfite, and ammonium and ammonium bisulfite are unstable compounds. If it is to be completely converted into ammonium sulfate, the commonly used one is basically There are two forms of aeration and spray oxidation, the biggest defect is that the power consumption is too high

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  • Treatment method and device of desulfurization tail gas
  • Treatment method and device of desulfurization tail gas

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Embodiment 1

[0029] Such as figure 1 As shown, the embodiment of the present invention provides a treatment device for desulfurization tail gas, including a sulfuric acid tail gas absorption tower 1, a reaction kettle 2, an ammonium sulfate separation mechanism 3, and a sulfur dioxide separation mechanism 4;

[0030] Described sulfuric acid tail gas absorption tower 1 comprises sulfuric acid tail gas absorption tower main body 11, ammonia water feed pipeline 12, sulfurous flue gas feed pipeline 13 and the gas distribution pipe 14 that is positioned at the bottom of described sulfuric acid tail gas absorption tower main body, described sulfuric acid tail gas The main body 11 of the absorption tower is provided with an ammonia water feed port 111, a sulfur-containing flue gas feed port 112, a gas discharge port 113 and a discharge port 114, and the ammonia water feed port 111 is connected with the ammonia water feed pipe 12, The sulfur-containing flue gas feed port 112 is in communication wi...

Embodiment 2

[0045] Such as figure 2 As shown, the embodiment of the present invention provides a treatment device for desulfurization tail gas, which also has the following features on the basis of Embodiment 1: the sulfuric acid tail gas absorption tower is also provided with a circulation pipeline 16, and the circulation pipeline 16 includes a jet device 163, lower liquid pipe 164, circulation pump 165, circulation pipe 166, and a circulation liquid inlet 161 and a circulation liquid outlet 162 positioned on the acid tail gas absorption tower, and the circulation liquid outlet 162 is connected with the circulation pipe 166 through the The ejector 163 is connected, and the ejector 163 is connected to the lower liquid pipe 164, and the lower liquid pipe 164 extends into the middle and lower part of the sulfuric acid tail gas absorption tower 1.

[0046] In order to increase the oxidation efficiency, it is necessary to carry out cyclic oxidation. The circulation pump 165 sends the liquid ...

Embodiment 3

[0048] The embodiment of the present invention provides a treatment method for desulfurization tail gas, using the above device, including the following steps:

[0049] Step 1. Using ammonia as a desulfurizer, the sulfuric acid tail gas absorption tower 1 fully contacts with the sulfur-containing flue gas gas-liquid, and the SO in the tail gas 2 NH 3 The reaction generates a mixed solution of ammonium sulfite, ammonium bisulfite, and ammonium sulfate, and the ammonia includes liquid ammonia, ammonia water or / and ammonium bicarbonate;

[0050] Step 2, the ammonium sulfite solution generated and the concentrated sulfuric acid are oxidized in the reactor 2 to obtain the ammonium sulfate solution, and sulfur dioxide gas is released simultaneously;

[0051] The ammonium sulfate solution that step 3, step 2 generate is sent to solid-liquid separator 33 through crystallizer, and the solid ammonium sulfate of separation is dried in ammonium sulfate drier 34, promptly obtains finished...

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Abstract

The invention provides a treatment method and device of desulfurization tail gas. The method comprises the following steps of: taking ammonia as a desulfurization agent; enabling the ammonia to be ingas-liquid sufficient contact with sulfur-containing flue gas in a sulfuric acid tail gas absorption tower and reacting to generate a mixed solution of ammonium sulfite, ammonium bisulfite and ammonium sulfate; carrying out oxidization reaction on the generated ammonium sulfite solution, the ammonium bisulfite and concentrated sulfuric acid in a reaction kettle to obtain an ammonium sulfate solution; meanwhile, releasing sulfur dioxide gas; carrying out post-treatment on the ammonium sulfate solution to obtain an ammonium sulfate finished product; separating sulfur dioxide and water steam, which are released through reaction, and conveying the water steam into the sulfuric acid tail gas absorption tower through a reflux pipe and a sulfur-containing flue gas feeding opening. According to the method provided by the invention, a process of converting the ammonium sulfite into the ammonium sulfate can be finished by directly adopting a concentrated sulfuric acid one-step conversion method;the method is simple to operate and the conversion rate of the ammonium sulfite can reach 100 percent; the energy consumption of an air compressor can be saved; meanwhile, the sulfur dioxide in tailgas is recycled into an acid production system, so that the yield of the sulfuric acid and the utilization rate of sulfur are improved.

Description

technical field [0001] The invention relates to the technical field of flue gas desulfurization, in particular to a treatment method and device for desulfurization tail gas. Background technique [0002] At present, the global environment is deteriorating day by day, and my country's environmental governance has been strengthened year by year, and energy conservation and emission reduction work has been carried out nationwide. The Ministry of Environmental Protection of the People's Republic of China is reducing sulfur dioxide emissions year by year, requiring enterprises to expand their scale not to increase sulfur dioxide emissions, and must have corresponding emission reductions every year. During the production of sulfuric acid after gas purification AS desulfurization in Xuangang Coking Plant, the acid gas containing hydrogen sulfide is burned in the incinerator to produce sulfur dioxide, and the contact tower reacts with oxygen in the air under the action of a catalyst...

Claims

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Application Information

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IPC IPC(8): B01D53/50B01D53/73C05C3/00B01D53/78
CPCB01D53/502B01D53/73B01D2251/2062C05C3/00
Inventor 田贺祥冯红军宋开荣赵俊华杜峰
Owner 襄阳泽东化工集团股份有限公司
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