Multi-stage sludge drying system and drying method thereof

Abstract

The invention discloses a sludge multi-stage drying system and a drying method thereof, and belongs to the technical field of sludge drying, the sludge multi-stage drying system comprises a coal gasification module, a sludge multi-stage drying device module and a pulverized coal furnace module, the sludge multi-stage drying device module comprises a cyclone separator connected with two sludge drying devices and a tail gas collecting device; the coal gasification system comprises a coal mill, a coal slurry pump, a gasification furnace and a cyclone separator; the pulverized coal furnace module mainly comprises a pulverized coal furnace, a pulverized coal bunker and an air-powder mixer. The sludge is subjected to multi-stage drying, so that the sludge can be fully dried, the sludge treatment cost and the fuel consumption are reduced, and meanwhile, heat is efficiently utilized.

Description

technical field [0001] The invention relates to the technical field of sludge drying, in particular to a sludge multistage drying system and a drying method thereof. Background technique [0002] With the development of the economy and the improvement of people's living standards, environmental problems have become increasingly complex. A large amount of municipal sewage in the city brings a large amount of sludge. In recent years, sewage discharge has increased year by year. According to relevant forecasts, my country's sewage discharge will have a relatively large increase in the next 20 years. The gradual increase in sewage treatment rate is accompanied by a large amount of excess sludge. [0003] Sludge drying and incineration technology is currently an efficient technology for sludge treatment. It uses heat to further dry the mechanically dehydrated sludge (water content is generally 80%) to reduce its water content (generally to 80%). 10%-50%), in order to meet the...

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Problems solved by technology

[0005] Aiming at the problems of high single sludge treatment cost and large heat loss in the treatment process in the prior art, the purpose of the present invention is to propose a sludge multi-stage drying system, which can efficiently use heat and reduce sludge treatment. Cost, so as to achieve the effect of energy saving and emission reduction

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