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Double-tower ammonia-method desulfurization process

An ammonia-based desulfurization and tower-type technology, applied in the field of flue gas desulfurization, can solve the problems of low aerosol content, inability to remove aerosol, and low recovery rate, and achieve high recovery rate, easy operation, and less aerosol

Inactive Publication Date: 2012-01-25
JIANGSU HEYICHANG ENVIRONMENTAL PROTECTION ENG & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to invent a double-tower ammonia method with a high recovery rate and low aerosol content in the exhausted flue gas for the problems of low recovery rate and inability to remove the aerosol in the flue gas in the existing flue gas desulfurization method Desulfurization process

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0026] Such as Figure 1-4 shown.

[0027] A double-tower ammonia desulfurization process, which includes the following steps:

[0028] Firstly, let the high-temperature flue gas enter the pre-washing tower from the top of the pre-washing tower T-101; at the same time, spray the spray liquid on the entering high-temperature flue gas at the top of the pre-washing tower to reduce the temperature of the flue gas from 110-160°C to 50-75°C; the spray liquid uses an ammonium sulfate solution with a concentration (m / m) of 10-20% (m / m), and the volume ratio of the spray liquid to the high-temperature flue gas is 0.3-0.6:1 (spray liquid The unit of flow is L / h, and the flow unit of flue gas is m 3 / h), after the high-temperature flue gas reacts with the spray liquid, an ammonium sulfate absorption slurry with a concentration (mass percentage) of 30-40% (m / m) ...

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Abstract

The invention relates to a double-tower ammonia-method desulfurization process which is characterized in that the desulfurization process of flue gas is carried out in a twin tower formed by combining a pre-washing tower and a desulfurizing tower, because slurry in the pre-washing tower and the desulfurizing tower keeps a certain concentration gradient, the twin towers are stable in operation andrunning, simultaneously reduce the abrasion of the slurry for the desulfurizing tower and members in the desulfurizing tower and prolong the service life of equipment. The pre-washing tower comprisesa dust-removing section, a cooling section and a concentration section; and the lower part of the desulfurizing tower is provided with an oxidization section, the middle of the desulfurizing tower isprovided with a main absorption section, and the upper part of the desulfurizing tower is provided with a water washing section. The pre-washing tower and the desulfurizing tower are both provided with sprinklers. The process has the advantages of simple and convenient operation, less aerosol in purified flue gas and high recovery rate of ammonium sulfate products.

Description

technical field [0001] The invention relates to a flue gas desulfurization method, in particular to a method for reducing sulfur dioxide aerosol in the net flue gas of ammonia desulfurization and improving the recovery rate of ammonium sulfate, specifically a double-tower ammonia desulfurization process. Background technique [0002] At present, flue gas, especially coal-fired boiler flue gas, is one of the most important sources of air pollution and has become an important object of environmental governance. In 2005, my country's SO 2 The annual emission is 25.49 million tons, which greatly exceeds the self-purification capacity of the environment, and the total emission exceeds that of the United States and Europe, ranking first in the world. SO 2 It should be a sulfur resource with great value, but it has become a pollution source with great environmental hazards. Among the existing flue gas desulfurization and purification technologies, ammonia desulfurization can pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/78B01D53/50
Inventor 杨叔衍刘新亚
Owner JIANGSU HEYICHANG ENVIRONMENTAL PROTECTION ENG & TECH