Sludge carbonization method

Abstract

The invention discloses a sludge carbonization method. The method comprises the following steps: 1) first dehydration: reducing the water content of sludge by 10-20% by using hot air; 2) low-temperature inactivation: carrying out second dehydration inactivation on the sludge subjected to the first dehydration at the temperature of 150-300 DEG C, so that the water content of the sludge subjected tothe second dehydration is less than 10%; 3) oxygen-controlled combustion: under an oxygen-controlled condition, combusting the sludge subjected to second dehydration at a temperature lower than 600 DEG C; and 4) oxygen deficit stabilization: sending the product obtained by combustion into an oxygen deficit link for carbonization stabilization, cooling to a temperature lower than 40 DEG C, and discharging to obtain the final product. The sludge carbonization method provided by the invention has the advantages of small investment, realization of sludge burning by sludge, reservation of part ofthe heat value, stabilization of sludge carbonization, increase of the added value, change of wastes into valuables, thorough treatment of sludge, no pollution, carrying of sludge by using a carrier loader, and improvement of the work efficiency.

Description

technical field [0001] The present application relates to the technical field of sludge treatment, in particular to a sludge carbonization method. Background technique [0002] At present, general solid waste disposal technologies for high calorific value mainly include landfill, incineration and high-temperature carbonization, etc., which are mostly used to treat the mixture of domestic waste and municipal sludge. Due to the complex composition of the disposal, the disposal process is complicated and the investment is large. , high energy consumption, and low disposal efficiency. Among them, the incineration process requires a large investment, and the components of the products obtained from disposal are complicated, and the final disposal is difficult, and the final products such as chimney ash still need to be landfilled. The high-temperature dry distillation process uses high-temperature anoxic pyrolysis method. Due to the passive pyrolysis method of indirect heat cond...

AI Technical Summary

Problems solved by technology

[0002] At present, general solid waste disposal technologies for high calorific value mainly include landfill, incineration and high-temperature carbonization, etc., which are mostly used to treat the mixture of domestic waste and municipal sludge. Due to the complex composition of the disposal, the disposal process is complicated and the investment is large. , high energy consumption, and low disposal efficiency

Among them, the incineration process requires a large investment, and the components of the products obtained from disposal are complex, and the final disposal is difficult, and the end products such as chimney ash still need to be landfilled.

The high-temperature dry distillation process uses high-temperature anoxic pyrolysis method. Due to the passive pyrolysis method of indirect heat conduction, the heat energy loss is large, resulting in high energy consumption, low heat energy utilization rate, and low production capacity.

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