Method for adjusting and controlling feeding mode of lime-dried municipal sludge cooperatively treated with cement kiln

Abstract

The invention relates to a method for adjusting and controlling a feeding mode of lime-dried municipal sludge cooperatively treated with a cement kiln. The method comprises the following steps: producing cement clinker by virtue of an existing novel dry-process cement clinker production line; recycling lime-stabilized sludge; specifically, conditioning the sludge with the water content being more than 80% by using lime, drying by virtue of residual heat of flue gas until the water content of the sludge is less than 35%, directly feeding the dried sludge to a vertical mill or a predecomposition kiln to serve as substitute raw material and fuel for cement raw materials, homogenizing, and firing in a rotary kiln to obtain the cement clinker, wherein the additive amount of the lime-dried sludge is 1wt%-21wt% of the cement raw materials; feeding from a proper feeding hole according to the components of the lime sludge, and effectively adjusting and controlling the cement raw materials to keep the cement production line stable and ensure good clinker quality. According to the method, the efficiency of cooperatively treating the lime-dried sludge with the cement kiln is improved, the sludge treatment capacity is high, the secondary pollution is alleviated, the consumption of calcium carbonate in the cement raw materials can be reduced, microelements in the sludge take the effect of a mineralizing agent, and the clinker can be conveniently fired. The method can provide a reference for study on cooperative treatment of solid wastes and the like during industrial production by the cement kiln.

Description

technical field [0001] The invention belongs to the sludge treatment technology in the field of resources and environment, and in particular relates to a method for regulating and controlling the feeding mode of lime-dried urban sludge co-processed in a cement kiln. Background technique [0002] With the increasing level of urbanization in our country, the discharge of urban sewage sludge in our country has also increased sharply, which has become an important factor restricting the economic development of our country. The high moisture content and complex composition of sludge is an important problem in sludge disposal. However, only about 20% of the sludge has been harmlessly treated and utilized as a resource, and the remaining 80% of the sludge has not been properly treated. The situation is abnormal Serious, will bring serious secondary pollution. Stabilization is the basis of sludge harmlessness and resource utilization, and is also the key to the sludge treatment pro...

AI Technical Summary

Problems solved by technology

In the process of co-processing lime-dried sludge in cement kilns, the addition of dried lime replaces the calcium raw material in cement raw meal, but the introduction of a large amount of calcium also makes the performance of cement clinker less Stablize

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