Coke oven flue-gas treatment system and treatment method thereof

Abstract

Provided are a coke oven flue-gas treatment system and a treatment method thereof. The coke oven flue-gas treatment system and the treatment method thereof, which can reduce effect and improve effects to the largest extent, are provided. The system comprises a coke oven flue-gas inlet, an absorption tower and a clean flue-gas discharging port. The coke oven flue-gas inlet is arranged in the middle of the absorption tower, and the clean flue-gas discharging port is arranged at the top of the absorption tower. An absorption spraying section positioned on the upper portion of the coke oven flue-gas inlet, a washing demisting section positioned on the upper portion of the absorption spraying section and located on the lower portion of the clean flue-gas discharging port and a grout tank positioned on the lower portion of the coke oven flue-gas inlet to accommodate absorption liquid are further arranged in the absorption tower. An absorption spraying loop, a ferrous solution supplementing loop and an ammonia water supplementing loop are arranged in the grout tank. The coke oven flue-gas treatment system is small in investment and low in energy consumption and running cost, a process system is mature and reliable, the desulfurization efficiency is as high as over 95%, and the environmental protection requirements are met.

Description

technical field [0001] The invention belongs to the field of environmental protection, and relates to a purification treatment system and treatment method for sulfur-containing and nitrate-containing flue gas, in particular to a desulfurization method for sulfur-containing and nitrate-containing flue gas discharged from the coke oven of a coking plant, specifically referring to ammonia low-temperature coke oven smoke Gas one-step desulfurization and denitrification system and its process. Background technique [0002] Sulfur dioxide is an important symbol to measure whether the atmosphere is polluted, and it is an important factor of air pollution, especially the "culprit" that causes acid rain pollution. The main sources of sulfur dioxide include burning sulfur-containing fuels, smelting sulfide ores, burning sulfur, manufacturing sulfuric acid and sulfurous acid, vulcanizing rubber, refrigeration, bleaching, disinfection, fumigation and insecticide, magnesium smelting, pet...

AI Technical Summary

Problems solved by technology

For the former, the main disadvantages are catalyst poisoning, ammonia leakage, and high investment and operating costs, which convert useful ammonia into useless N 2 , the process is not economical; for the latter, it is not suitable for flue gas denitrification in an atmosphere with high oxygen content

[0008] In order to solve the problem of flue gas denitrification, various solutions have been proposed at home and abroad. Among them, the patent CN101053747A proposes a scheme that uses a strong oxidant to oxidize NO first, and then uses ammonia water to absorb it. This scheme consumes a large amount of ozone, hydrogen peroxide, etc. Oxidizing agent, the process is very uneconomical

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