Method and device for mixing and burning sludge by circulating fluidized bed boiler

Abstract

The present invention relates to environment protecting technology, and is especially method of mixing sludge for burning in circular fluidized bed boiler and the special sludge conveyer. The method includes: A. feeding sludge into the upper or middle part negative pressure area in hearth of circular fluidized bed boiler via the sludge conveyer; B. controlling the sludge adding amount below 100 % of fuel weight and sludge water content of 25-90 %; and C. stoving and preheating sludge while it falls inside the hearth, burning its inflammables while decomposing and eliminating residual harmful microbes, germs and bad smell in high temperature area of 850-980 deg.c for 2-6 sec. The present invention provides one harmless way of treating sludge of sewage works.

Description

technical field [0001] The invention relates to environmental protection technology, in particular to a method for co-firing sludge in a circulating fluidized bed boiler and a unique sludge conveying device. Background technique [0002] With the continuous deepening of the country's treatment of sewage, sewage treatment plants in cities and towns have been built and put into operation. What follows is that the sludge produced by the sewage treatment plant in the process of sewage treatment has begun to become a new source of pollution. After the coagulant is added in the process of sewage treatment, the sludge will settle down to form sludge, and the moisture in it is very high. After passing through the centrifuge or bag filter, the moisture is still as high as about 80%. It is difficult to separate the sludge by conventional methods. Remove internal moisture. At present, the common treatment method in China is landfill, but because the coagulant added in the sewage trea...

AI Technical Summary

Problems solved by technology

After the coagulant is added in the process of sewage treatment, the sludge will settle down to form sludge, and the moisture in it is very high. After passing through the centrifuge or bag filter, the moisture is still as high as about 80%. It is difficult to separate the sludge by conventional methods. Internal moisture removal

At present, the common treatment method in China is landfill, but because the coagulant added in the sewage treatment process will be completely decomposed after 24 hours, and cannot continue to play a role in coagulation, resulting in the use of landfill methods to treat these sludges. Therefore, general landfills are unwilling to accept this kind of sludge, and a sewage treatment plant with a daily processing capacity of 100,000 tons will produce 100 tons of such high-moisture sludge every day

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