Sludge drying coupled coal-fired power generation system and method

Abstract

The invention provides a sludge drying coupled coal-fired power generation system. The system comprises a sludge pre-treatment dehydration unit for carrying out primary dehydration on a wet sludge rawmaterial, a sludge indirect drying unit for carrying out drying treatment on the sludge subjected to primary dehydration, and a coal powder grinding and conveying combustion for conveying the dried sludge into a fan mill system, commixing with coal and drying, grinding and sufficiently mixing the sludge and the coal, and conveying a mixture into a coal-fired boiler for combustion. The invention further provides a sludge drying coupled coal-fired power generation method; a technological process coupling sludge drying and the coal-fired boiler is adopted, and sufficient low-grade water steam residual heat of a coal-fired power station is sufficiently utilized for a sludge primary drying and dehydration technology; the amount of pumping smoke of a high-temperature furnace through a fan millis reduced; the dried sludge is doped and mixed with the crude coal and is used for generating power; recycling, harmless, reduction and stable treatment of the sludge is realized and secondary pollution is avoided.

Description

technical field [0001] The invention relates to a sludge drying coupled coal-fired power generation system and a process method thereof, belonging to the technical field of solid waste treatment. Background technique [0002] With the development of our country's social economy and the rapid development of urbanization, the number and scale of urban sewage plants continue to increase, and the output of sewage and sludge increases sharply. By 2020, the output of sludge will exceed 60 million tons. Proper handling and disposal will pose a threat to the environment and human health. Due to the large amount of toxic and harmful substances contained in the biological sludge of the sewage plant, it is easy to cause secondary pollution. Therefore, how to scientifically treat the sludge with huge output and complex components to make it stable, reduce, harmless, and resourceful has become a common concern of the environmental circles in my country and the world. Since the treatmen...

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Problems solved by technology

However, there are also many problems in sludge incineration treatment. It is very difficult to reduce the moisture content of sludge to a level that can be burned, and the drying energy consumption is high. If the sludge is not dried, coal needs to be added to the sludge, so that the sludge The cost of mud incineration has increased significantly

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