Sludge roller external heat drying and circulating fluidized bed incineration integration and tail gas cleanup device

Abstract

The invention discloses a sludge roller external heat drying and circulating fluidized bed incineration integration and tail gas cleanup device, and belongs to the technical field of sludge incineration treatment. The problem existing in an existing sludge drying and incineration technology is solved. The device comprises a circulating fluidized bed, a drying system and a tail gas cleanup system. The drying system comprises a rotary kiln roller, a fan and a condenser. The rotary kiln roller is inserted into a tail flue of the circulating fluidized bed in a penetrating mode. After water vapor and bed smell generated in the sludge drying process are condensed and water is removed, the water vapor and bed smell are supplied to a hearth of the circulating fluidized bed to be combusted for deodorization; two air preheaters are arranged inside the tail flue and connected with a primary tuyere and a secondary tuyere arranged in the hearth of the circulating fluidized bed respectively. The tail gas cleanup system comprises an activated carbon injection device, a cloth bag dust remover and a wet desulphurization system which are sequentially arranged behind the air preheaters. A gas conveying pipe is arranged between the cloth bag dust remover and the wet desulphurization system to be connected with the primary tuyere. The device is used for sludge drying and incineration.

Description

technical field [0001] The invention belongs to the technical field of sludge incineration treatment, and in particular relates to a sludge drum external heat drying and circulating fluidized bed incineration integration and tail gas purification device. Background technique [0002] With the continuous improvement of my country's economic level, the amount of sewage treatment has also increased significantly. At present, there are nearly 4,000 sewage treatment plants in my country, which produce about 55 million tons of wet sludge with 80% water content every year, and nearly 60% of the pollutants in sewage It is concentrated in the sludge, so the harmless treatment of sludge needs to be solved urgently. At present, the main method of domestic sludge disposal is direct landfill, and very few use incineration. Because landfill needs to occupy a large amount of land, and may cause pollution to groundwater, sludge incineration is a reduction, stabilization, and harmless method....

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Problems solved by technology

There are many problems in the existing domestic sludge drying and incineration technology, for example: the patent applied by Zhejiang Sanlian Environmental Protection Machinery Equipment Co., Ltd., a built-in comprehensive sludge drying and incineration system and sludge drying and incineration method, application number: 201410329596 . X, although the intermediate circulation link is omitted to avoid the leakage of odor, it needs to add pulverized coal to the sludge, and it needs to be burned twice, so the operating cost is high; the utility model patent rotary kiln sludge applied by Yu Hongtao Thermal drying device, patent number: 201020617754.9, adopts a single-stage drying method, and there are problems such as too long a rotary kiln body, too large an area, and the sludge moisture can only be reduced to about 40% in general, and these patents are very harmful to incineration. Exhaust is not treated

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