System and method for flue gas desulfurization

A desulfurization system and flue gas technology, applied in separation methods, chemical instruments and methods, gas treatment, etc., to achieve the effect of low price, wide range of sources, and realization of recycling

Inactive Publication Date: 2017-01-25
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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Problems solved by technology

However, most zinc production enterprises adopt the pyrotechnic process, and the smelting process produces a large amount of SO 2 Flue gas; Even if wet smelting is used, the drying, roasting of raw materials and volatilization of leaching residue will produce a large amount of SO 2 smoke

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  • System and method for flue gas desulfurization

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Embodiment 1

[0044] see figure 1 , implement a kind of rotary kiln type treatment of village and town domestic garbage and its flue gas purification process proposed by the present invention, mainly including drying furnace, dry distillation carbonization furnace, pulping tank, circulation tank, absorption tower, demister, oxidation tank, oxidation fan , filter, purifier, flue gas booster fan, aeration pipe, circulation pump, slurry pump, zinc oxide silo, etc. The rotary kiln system first screens and crushes the garbage in the early stage, and then the garbage is heat-treated in the drying furnace and carbonization furnace. After heat treatment, the flue gas is sent to the desulfurization system. The first step in the desulfurization system is the production of zinc oxide slurry. The zinc oxide powder and process water are prepared in a stirring tank according to a certain ratio to form a slurry. The technical requirement is that the solid phase weight concentration of the zinc oxide slur...

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Abstract

The invention discloses a system and method for flue gas desulfurization. The method comprises the following steps: inputting flue gas to be treated to the bottom of a desulfurizing tower, inputting zinc oxide slurry from an upper section of the desulfurizing tower, and enabling the flue gas to be treated and the zinc oxide slurry to contact with each other and flow in opposite directions in the desulfurizing tower; introducing an oxidizing gas from the bottom of the desulfurizing tower to oxidize zinc sulfite, which is generated by the contact of the flue gas and the zinc oxide slurry, into zinc sulfate; and delivering the slurry after absorption of SO2 in the desulfurizing tower to the top of the desulfurizing tower for cyclic utilization. The principle is that SO2 in the flue gas reacts with zinc oxide to generate zinc sulfite, and then the zinc sulfite is oxidized into zinc sulfate by using air, thereby achieving the aim of desulfurization. The desulfurization efficiency of the system and method disclosed by the invention reaches 96% or above, no waste liquid is discharged, and the raw materials are low in price and can be used repeatedly, so that the system and the method meet requirements for clean production.

Description

technical field [0001] The invention relates to the technical field of waste treatment and environmental protection, and more specifically relates to a flue gas desulfurization system and method. Background technique [0002] my country is the largest zinc producer in the world, and its zinc output ranks first in the world. Zinc smelting methods can be divided into two categories: fire method and wet method. However, most zinc production enterprises adopt the pyrotechnic process, and the smelting process produces a large amount of SO 2 Flue gas; Even if wet smelting is used, the drying, roasting of raw materials and volatilization of leaching residue will produce a large amount of SO 2 smoke. These flue gas quantities are large, SO 2 Low concentration. [0003] With the increasingly stringent environmental protection requirements in our country, especially the new standards for lead and zinc industrial pollution discharges that have been implemented since October 1, 201...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/80B01D53/50
CPCB01D53/50B01D53/80B01D2258/0283
Inventor 夏训峰席北斗韦超王丽君吕慧瑜徐善宝党秋玲余红
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI
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