In-hollow column intercrystalline ammonia process of desulfurization, recovery system and method thereof

A technology of ammonia desulfurization and recovery system, which is applied in separation methods, chemical instruments and methods, and separation of dispersed particles. It can solve problems such as high concentration of circulating slurry, decrease in desulfurization rate, and blockage, and achieve shortening of concentration time and concentration times. The effect of high ratio and increased concentration efficiency

Inactive Publication Date: 2009-05-13
北京中大能环工程技术有限公司
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Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art, and propose a desulfurization and recovery system and method thereof by crystallization ammonia in an empty tower, which successfully solves the pro

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  • In-hollow column intercrystalline ammonia process of desulfurization, recovery system and method thereof

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Embodiment Construction

[0018] The crystallized ammonia method desulfurization in the empty tower proposed by the present invention, recovery system and method thereof are described in detail as follows in conjunction with accompanying drawings and embodiments:

[0019] The embodiment of the present invention deals with two coal-fired boilers with an evaporation capacity of 150t / h. Flue gas volume 300000Nm 3 / h, boiler coal consumption 19t / h, coal-fired total sulfur 2%, exhaust gas temperature 150°C

[0020] In this embodiment, the crystallized ammonia method desulfurization and recovery system and the desulfurization and recovery process in the empty column tower are shown in Figure 1.

[0021] The crystallized ammonia desulfurization and recovery system in the empty tower of this embodiment is composed of a spray desulfurization tower and an ammonium sulfate recovery device. The desulfurization tower includes a tower body and a hydraulic stirring tube 1 arranged at the bottom of the cavity in the ...

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Abstract

The invention relates to a crystallization ammonia process desulfurization and recycling system in an empty tower and a method thereof, which belong to the technical field of environment-friendly equipment. The system comprises a sprinkling desulfurizing tower, a hydrocyclone, a centrifuger, and a vibrating fluidized bed dryer. The method comprises the following steps: hot flue gas enters the middle part of the sprinkling desulfurizing tower, reaches the optimal temperature for ammonia process desulphurization after being cooled by process water sprinkling at the inlet of the tower, and then is subjected to absorption by a sprinkling layer, and finally gets rid of most of free water which is removed by a defogger; clean flue gas is directly sent out by a steel chimney on the top of the sprinkling desulfurizing tower; absorption liquid in a stock tank at the lower part of the tower reaches the state of supersaturation after being subjected to circulating absorption a plurality of times, is forced to be oxidized by oxygen in air and flue gas in the bottom of the tower, and finally produces an ammonium sulphate saturated solution containing a certain amount of solid; the ammonium sulphate saturated solution containing a certain amount of solid is further concentrated by a water cyclone; the concentrated solution forms powder through the centrifuger; and after being dried by the drier, ammonium sulphate products with water content of less than 0.3% can be obtained.

Description

technical field [0001] The invention belongs to the technical field of environmental protection equipment, and in particular relates to an empty-tower crystallization desulfurization device and process for removing and recovering sulfur dioxide in flue gas. Background technique [0002] Traditional in-tower crystallization desulfurization technology mainly adopts double-tower structure and single-tower packed tower structure. The main defect of the former is that the double-tower structure has a large equipment cost at one time, resulting in high unit desulfurization cost, because the gas entrains liquid more seriously. It is difficult to achieve the purpose of a large concentration difference between the two towers without adding a wet dust collector. It is necessary to add a wet dust collector, which not only greatly increases the equipment cost, but also increases the pressure drop of the desulfurization system, and also increases power consumption and maintenance costs....

Claims

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Application Information

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IPC IPC(8): B01D53/78B01D53/50
Inventor 鲍大磊
Owner 北京中大能环工程技术有限公司
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