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Method and system for selectively removing HCl in flue gas

A selective, flue gas technology, applied in the field of flue gas pollutants and wastewater treatment, which can solve the problems of increasing treatment costs, large flue gas flow, and increasing the amount of base substances, reducing investment and operating costs, and reducing dechlorination efficiency. The effect of high and low processing difficulty

Pending Publication Date: 2022-01-18
XIAN TPRI WATER & ENVIRONMENTAL PROTECTION +2
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  • Application Information

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Problems solved by technology

At this stage, there are literature and patent reports on the use of lye spray and dry powder to pre-dechlorinate in front of the desulfurization tower. 3 / h) and the composition is complex, the concentration of HCl in the flue gas is very low, only ten to tens of ppm, SO 2 The concentration is tens or even hundreds of times that of HCl, which significantly competes for the reaction with basic substances. Other acid gases are roughly in the same order of magnitude as HCl, and there is also a competitive effect. Therefore, to achieve higher dechlorination efficiency, it is necessary to increase the base The amount of substance used, which undoubtedly increases the processing cost

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  • Method and system for selectively removing HCl in flue gas
  • Method and system for selectively removing HCl in flue gas

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Embodiment Construction

[0021] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only The embodiments are a part of the present invention, not all embodiments, and are not intended to limit the scope of the present invention. Also, in the following description, descriptions of well-known structures and techniques are omitted to avoid unnecessarily obscuring the concepts disclosed in the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0022] The schematic diagrams of the structures according to the disclosed embodiments of the pr...

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Abstract

The invention discloses a method and system for selectively removing HCl in flue gas. The method comprises the step of selectively absorbing HCl in flue gas through an absorbent, wherein the absorbent comprises a NaHSO3 solution. HCl in flue gas can be selectively removed according to the method and the system.

Description

technical field [0001] The invention belongs to the field of flue gas pollutants and waste water treatment, and relates to a method and system for selectively removing HCl in flue gas. Background technique [0002] With the completion of the ultra-low emission transformation, the NOx, SOx and particulate matter pollution in the flue gas of coal-fired units has been controlled to a considerable extent, and the pollutant emission concentration has met the corresponding national environmental protection standards. However, the existing wet desulfurization system on SO 2 In the process of treatment, a new problem arises - the treatment of desulfurization wastewater. The impurities contained in desulfurization wastewater mainly include suspended solids, supersaturated sulfite, sulfate and heavy metals, many of which are the first type of pollutants that are strictly controlled in the national environmental protection standards. At this stage, the mainstream treatment technologi...

Claims

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Application Information

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IPC IPC(8): B01D53/18B01D53/14
CPCB01D53/18B01D53/1456B01D53/185B01D53/1412B01D2258/0283B01D2252/10B01D2247/10B01D2257/2045
Inventor 逯佳琪曹红梅毛进鲁先超张卫东万锐刘增瑞王璟王可冰董传亮王凯刘亚鹏
Owner XIAN TPRI WATER & ENVIRONMENTAL PROTECTION