Method for denitration of coal-fired power plant boiler through synergistic recycling of sludge and coal slime

Abstract

The invention belongs to the field of municipal solid waste treatment and the technical field of coal-fired boiler flue gas denitration, and particularly relates to a method for denitration of a coal-fired power plant boiler through synergistic recycling of sludge and coal slime. The sludge or the coal slime or a sludge and coal slime mixture is subjected to preliminary dehydration through a mechanical device, the semi-dry sludge or coal slime or sludge and coal slime mixture is subjected to pyrolysis gasification by using flue gas waste heat of a power plant, gasified gas, liquid and solid products are added into the coal-fired boiler of the power plant from reasonable positions, pyrolysis gas and coke are used for strengthening denitration independently or in cooperation with SNCR reaction, liquid tar and the coke are effectively used for supporting combustion, resource clean utilization and harmless treatment of the coal slime and the sludge are achieved while the denitration efficiency of the boiler is improved, heat energy is fully coupled and utilized, and economic benefits and social benefits are remarkable.

Description

technical field [0001] The invention belongs to the field of municipal solid waste treatment and the technical field of flue gas denitrification of coal-fired boilers, and specifically relates to a method for synergistic resource utilization of sludge and coal slime for denitrification of coal-fired power plant boilers. Background technique [0002] (1) Municipal sludge treatment methods [0003] Municipal municipal sludge comes from urban sewage treatment plants, with an original moisture content of 95%-99%. With the improvement of residents' living standards, sludge production is increasing year by year. In addition to a large amount of nutrients such as nitrogen and phosphorus, sludge also contains toxic and harmful substances such as heavy metals, pathogens, parasite eggs, and toxic organic substances. If the sludge is not treated effectively, it will seriously pollute the environment and affect people's health. healthy. At present, sludge reduction and harmless treat...

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Problems solved by technology

The above three measures have been adopted and promoted in China, among which combustion utilization is the most important way of utilization, but most of the coal slime has low fixed carbon content, high sulfur and ash content, and low calorific value. If a large amount of coal slime is mixed with It will bring problems such as combustion instability, equipment wear and sulfur content increase in the furnace, which restricts large-capacity and large-volume combustion power generation

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