Waste gas purification process and purification system

Abstract

The invention discloses a waste gas purification process and purification system, which comprises a combustion furnace, a bag type dust remover, a high-temperature section of a smoke gas heat exchanger, a precooler, a washing tower, a low-temperature section of the smoke gas heat exchanger and a chimney in sequential communication through a smoke gas pipeline, wherein a power spraying mechanism isarranged between the combustion furnace and the bag type dust remover; a spray nozzle of the powder spraying mechanism is arranged in the pipeline; a filling material layer, an alkali liquid sprayer,a secondary alkali liquid sprayer, a water mist sprayer and a mist eliminator are sequentially arranged inside the washing tower from bottom to top. The smoke gas is sequentially subjected to lime hydrate and active carbon spraying, filtering, temperature reduction, alkali liquid spraying, secondary alkali liquid spraying, water mist spraying, mist elimination and temperature rise; acid gas, dioxin and heavy metal can be effectively eliminated; the operation is simple, so that the discharge index can be greatly lower than the environmental protection standard level; meanwhile, the smoke gas heat exchanger is used; the smoke gas afterheat is effectively utilized; the heat utilization efficiency is improved; the waste gas treatment cost is effectively reduced.

Description

technical field [0001] The invention relates to the technical field of waste gas treatment, in particular to a waste gas purification process and a purification system. Background technique [0002] my country's domestic waste has the characteristics of large amount, complex composition, and dirty. The organic matter in the waste storage pit is easily rotted and fermented by microorganisms, and a certain amount of ammonia, hydrogen sulfide, organic amine, methane, etc. are produced, which are both odorous and harmful. gas. Under aerobic and anaerobic conditions, the main components of the malodorous gas are ammonia and H2S, respectively. During incineration, due to the low calorific value of domestic waste in my country, it is necessary to mix pulverized coal for combustion. In addition, due to the complex composition of domestic waste, secondary pollution will inevitably be generated during the incineration process, especially dioxins, heavy metals, etc., resulting in inci...

AI Technical Summary

Problems solved by technology

To deal with the exhaust gas produced in this kind of incineration device, most of the existing technologies need to be equipped with exhaust gas purification facilities such as dust removal and desulfurization to perform dust removal and desulfurization, but the efficiency of dust removal and desulfurization in the prior art is not high, and the cost of purifying the exhaust gas at the same time also high

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