Sludge dewatering, drying and incinerating system and method

Abstract

The invention relates to a sludge dewatering, drying and incinerating system and method. The system comprises a sludge conditioning device, a sludge deep dewatering device, a sludge drying device, a sludge self-maintaining incinerating device and a smoke treatment device which are sequentially connected; the sludge drying device is connected with a condensation recovery device; the condensation recovery device is connected with the sludge conditioning device and the sludge self-maintaining incinerating device; a heat recovery device is further connected between the sludge self-maintaining incinerating device and the smoke treatment device. Steam in the sludge drying device is recycled, and the heat utilization efficiency of the system is improved; sludge is conditioned through condensate of the condensation recovery device, and dewatering of the sludge is facilitated; ash slag in smoke in the sludge self-maintaining incinerating device is recycled, no auxiliary fuel is required, the utilization efficiency of resources is high, and accordingly, the sludge dewatering, drying and incinerating system and method are suitable for various kinds of resourceful sludge treatment, multistage utilization of heat, water and slag is realized, and energy reduction and resource recovery effects are remarkable.

Description

technical field [0001] The invention relates to a sludge dehydration, drying, incineration system and method, and belongs to the technical field of sludge treatment. Background technique [0002] The general urban domestic sewage plant or wastewater plant produces a large amount of domestic sludge. The usual sludge treatment method is: after the domestic sludge is subjected to pressure filtration, its moisture content is usually about 80%, and the sludge with high moisture content is mostly used. landfill, high-temperature composting, etc., which can easily cause new environmental pollution. The sludge incineration treatment is the most thorough sludge solution, but the sludge with high moisture content cannot be directly incinerated, and must be dehydrated, dried or added with combustion auxiliary materials. The latter method not only wastes fuel but also produces new pollution, so generally, sludge must be dried before incineration. [0003] The traditional sludge drying...

AI Technical Summary

Problems solved by technology

Due to the large investment in infrastructure construction and high operating costs, the sludge problem at home and abroad has not been effectively solved. The problem of sludge drying and incineration has become a bottleneck problem that needs to be solved urgently in urban sewage treatment plants.

[0004] The existing sludge incineration system has the following problems: the steam of the dryer cannot be reused, the flue gas ash of the sludge incinerator is not recycled, and a lot of energy needs to be consumed, resulting in high cost of incinerating sludge, which is not conducive to the promotion of environmental protection in the country

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