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Moving bed coupling absorption desulfurization method based on flue gas semi-dry method

A moving bed, semi-dry technology, applied in separation methods, chemical instruments and methods, gas treatment, etc., can solve the problems of reducing flue gas temperature, shortening service life, increasing energy consumption of SCR operation, and improving removal efficiency. , Improve the utilization rate and solve the effect of solid waste separation difficulties

Active Publication Date: 2021-06-11
SHANGHAI JIAO TONG UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Conventional SCR catalytic technology is easy to receive SO 2 The impact of poisoning leads to a shortened service life, so it is a better choice to perform flue gas desulfurization before the SCR catalytic section
However, wet desulfurization will reduce the temperature of flue gas and increase the energy consumption of SCR operation; dry / semi-dry desulfurization is difficult to meet the demand for ultra-low emission of sulfur dioxide from flue gas. Therefore, it is urgent to improve the existing flue gas desulfurization technology

Method used

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  • Moving bed coupling absorption desulfurization method based on flue gas semi-dry method

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Embodiment 1

[0048] A moving bed coupled absorption method based on flue gas semi-dry desulfurization using the above system, the method comprises the following steps:

[0049] (1) Transport the granular desulfurization agent to the moving bed adsorption device 1 from top to bottom, and spray the desulfurization absorption liquid on the surface of the granular desulfurization agent at the same time; wherein, the liquid-gas ratio of the spray volume of the desulfurization absorption liquid to the flue gas volume is 1.0L / m 3 , the ratio of the delivery volume of the granular desulfurizer to the flue gas volume is 1g / m 3 ; The desulfurization absorption liquid is magnesium carbonate, the concentration is 1%; the granular desulfurization agent is activated alumina pellets, the particle diameter is about 5mm;

[0050] (2) In the moving bed adsorption device 1, the granular desulfurizer is fully contacted with the rising flue gas during the downward movement, and the SO in the flue gas 2 Absor...

Embodiment 2

[0054] A moving bed coupled absorption method based on flue gas semi-dry desulfurization using the above system, the method comprises the following steps:

[0055] (1) Transport the granular desulfurization agent to the moving bed adsorption device 1 from top to bottom, and spray the desulfurization absorption liquid on the surface of the granular desulfurization agent at the same time; wherein, the liquid-gas ratio of the spray volume of the desulfurization absorption liquid to the flue gas volume is 2.0L / m 3 , the ratio of the delivery volume of the granular desulfurizer to the flue gas volume is 1g / m 3 ; The desulfurization absorption liquid is magnesium carbonate, the concentration is 1%; the granular desulfurization agent is activated alumina pellets, the particle diameter is about 5mm;

[0056] (2) In the moving bed adsorption device 1, the granular desulfurizer is fully contacted with the rising flue gas during the downward movement, and the SO in the flue gas 2 Absor...

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Abstract

The invention relates to a moving bed coupling absorption desulfurization method based on a flue gas semi-dry method, which comprises the following steps: (1) conveying a granular desulfurizer into a moving bed adsorption device (1), and spraying a desulfurization absorption liquid on the surface of the granular desulfurizer at the same time; (2) enabling the granular adsorbent flowing out of the moving bed adsorption device (1) to pass through a vibrating screen conveying device (11), separating fine desulfurizer powder generated by abrasion, and then adding the fine desulfurizer powder into the moving bed adsorption device (1) from the upper end of the moving bed adsorption device (1) through a granular desulfurizer lifting device (12) for cyclic utilization; and (3) treating the flue gas adsorbed by the moving bed adsorption device (1) by passing through a bag-type dust collector (2) to realize flue gas desulfurization. Compared with the prior art, the method has the advantages that the wet desulfurization process and the semi-dry desulfurization process are effectively combined, the desulfurization efficiency of the flue gas is improved, the generation of desulfurization wastewater is reduced, and a basis is provided for the subsequent application of a flue gas low-temperature denitration technology.

Description

technical field [0001] The invention relates to the technical field of adsorption and removal of flue gas gaseous pollutants, in particular to a moving bed coupled absorption desulfurization method based on a flue gas semi-dry method. Background technique [0002] Flue gas desulfurization (FGD) is a major process of industrial flue gas purification. Its main principle is to use alkaline absorbent / adsorbent to capture sulfur dioxide in the flue gas, so as to achieve the purpose of flue gas purification. The flue gas desulfurization process is generally divided into three categories: wet desulfurization, dry desulfurization and semi-dry desulfurization. Among them, wet desulfurization has the best effect, so a large part of industrial flue gas desulfurization adopts wet desulfurization method. However, wet desulfurization requires a large amount of process water, and its reaction temperature is low, and the blockage and corrosion of pipelines and equipment are serious. The d...

Claims

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Application Information

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IPC IPC(8): B01D53/50B01D53/80B01D53/96
CPCB01D53/501B01D53/508B01D53/80B01D53/96B01D2258/0283
Inventor 瞿赞李咸伟晏乃强石洪志黄文君刘道清高冠群
Owner SHANGHAI JIAO TONG UNIV
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