High-temperature acid-contained smoke hydrogen chloride recovering system

Abstract

The invention discloses a high-temperature acid-contained smoke hydrogen chloride recovering system, and relates to the field of acid-contained smoke resourceful treatment. The recovering system comprises a power wave washer, a washing tower, an alkali liquor tower, reboilers and a hydrochloric acid resolution tower. The power wave washer, the washing tower and the alkali liquor tower are sequentially connected. High-temperature acid-contained smoke is sequentially processed by the power wave washer, the washing tower and the alkali liquor tower and then directly discharged. One side of the bottom of the power wave washer is sequentially connected with a filter and the first reboiler through a conveying pump. The outlet end of the first reboiler is connected with the hydrochloric acid resolution tower. The conveying pump is used for conveying high-temperature mixed wastewater containing hydrogen chloride and heavy metallic salt at the bottom of the power wave washer into the hydrochloric acid resolution tower, and flashing is conducted through the first reboiler connected to the bottom of the hydrochloric acid resolution tower, so hydrogen chloride in mixed liquid is converted intogas to be separated out. By means of a high-temperature acid-contained smoke hydrogen chloride recovering process, hydrogen chloride in the high-temperature acid-contained smoke is effectively separated and recovered, and waste recycling is achieved.

Description

technical field [0001] The invention relates to the field of resource treatment of acid-containing flue gas, in particular to a hydrogen chloride recovery system for high-temperature acid-containing flue gas. Background technique [0002] With the rapid development of social economy and rapid urbanization, the output of municipal solid waste has also increased rapidly, and the amount of fly ash after waste incineration has also increased year by year. Fly ash is not only included in the "National List of Hazardous Wastes" (2016 Edition) (hereinafter referred to as the "List"), but also included in the "List of Hazardous Waste Exemption Management" of the "Inventory". The characteristics of fly ash pollution mainly include three aspects: one is dissolved salt pollution, the mass fraction of dissolved salt in fly ash can be as high as 22.1%, mainly chlorides, such as NaCl, KCl, CaCl2, the existence of these substances has great influence on the solidification and stabilization...

AI Technical Summary

Problems solved by technology

The flue gas contains a large amount of hydrogen chloride, and the absorption with lye can only absorb hydrogen chloride into salt, and the absorption liquid will also become waste water that needs to be treated again, and the simple material transfer cannot be used for resource utilization of waste

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