Artificial freeze-thaw sludge dewatering and coal blending incineration treatment method

Abstract

The invention discloses an artificial freeze-thaw sludge dewatering and coal blending incineration treatment method which comprises the following steps: arranging a freezing pipe, a temperature measuring pipe and a drainage structure in a sludge layer, then freezing mucky soil, then unfreezing the sludge layer, draining water in cooperation with a drainage device, and after at least one time of freeze-thaw treatment, enabling that the mucky soil and high-moisture coal are subjected to blending combustion power generation treatment in a circulating fluidized bed boiler. According to the method, firstly, the mucky soil is dewatered by adopting a freezing and thawing or repeated freezing and thawing mode in cooperation with the drainage device, so that the settling performance and the filtering performance of the mucky soil are obviously improved, the effective particle size of the mucky soil is increased, the water content tends to 60%, and in addition, odor pollution of the mucky soil can be inhibited; and then the mucky soil which is frozen and thawed or repeatedly frozen and thawed and bituminous coal are subjected to blending combustion treatment on the circulating fluidized bed boiler according to the blending combustion ratio of 4-20%, so that normal operation and power generation of a boiler unit can be ensured, and the emission amount of dioxin in flue gas is below a detection limit value.

Description

technical field [0001] The invention relates to the technical field of sludge treatment, in particular to an artificial freeze-thaw sludge dehydration mixed with coal incineration treatment method. Background technique [0002] Silt dredging is a commonly used engineering measure in channel dredging, port maintenance, and lake governance. In my country, more than hundreds of millions of cubic meters of dredged silt are produced every year. For a long time, ocean dumping and land dumping have been the routine treatment methods for dredged silt, but with the continuous improvement of environmental awareness, ocean dumping is being banned by more and more countries, and land dumping is also due to serious land occupation and Environmental issues are called into question. Therefore, how to efficiently deal with dredged silt has become an important issue. [0003] The heat energy generated when the organic matter deposited in the dredged sludge is burned can be used for power g...

AI Technical Summary

Problems solved by technology

However, the water content of dredged silt is relatively high, which will reduce the theoretical combustion temperature of the boiler during the mixed combustion process, resulting in a decrease in the combustion efficiency of the boiler, so dehydration treatment is necessary

[0004] Traditional sludge dehydration methods mainly undergo evaporation and diffusion processes, including traditional thermal drying, solar drying, microwave heating drying, ultrasonic drying and biological drying, etc. The sedimentation and filtration speeds of sludge are relatively slow, and mixing is required. coagulant, higher cost, lower efficiency

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