Method for drying and burning sludge via cement plant kiln tail system

Abstract

The invention discloses a method for drying and burning sludge via cement plant kiln tail system, the method comprises the steps as follows: firstly spraying the sludge, the water content of which is 70-85% into the cement plant kiln tail humidifier tower through the atomizing nozzle, the smoke of the temperature of 250-400 degrees centigrade discharged from the cement plant kiln tail gets into the humidifier tower from the top; the sludge is dried by the high temperature smoke in the kiln tail humidifier tower and transmitted to the kiln tail burning system as the fuel of the cement producing system, the burned residue is used as the cement raw material and transmitted to the rotary kiln to be burned into the cement clinker; the method for drying and burning sludge via cement plant kiln tail system can overcome the defect of the prior sludge drying and burning technology, the dust in the waste gas can effectively absorb the harmful gas generated by the sludge drying process, the high temperature environment of the cement producing system for drying and burning and the sludge is used, the cement producing energy consumption and producing cost can be effectively reduced, the method is practical and has industrial use value.

Description

technical field [0001] The invention belongs to the field of sludge treatment, and in particular relates to a method for drying and burning sludge by utilizing a kiln tail system of a cement plant. Background technique [0002] With the development of the economy and the acceleration of the urbanization process, the discharge of urban sewage has increased dramatically. In order to protect the limited water resources and ecological environment, these sewage must be treated to separate the harmful substances. Municipal sludge is a complex heterogeneous body composed of organic debris, bacterial cells and inorganic particles produced in the process of urban sewage treatment, in which a large number of pollutants and heavy metals are enriched. The amount of urban sludge produced in the process of sewage treatment in my country is as high as 30 million tons per year, and it is increasing at a rate of 10% per year. It is urgent to treat and dispose of urban sludge safely and econ...

AI Technical Summary

Problems solved by technology

[0005] At present, there are two main ways to use the sludge with a moisture content of about 80% discharged from the sewage treatment plant for cement production: one is to directly send it to the tail of the rotary kiln, and the sludge is dried under the high temperature environment in the rotary kiln And the incineration process, but it will cause large fluctuations in the temperature of the kiln tail, causing operational difficulties and equipment damage; the second is in a separate drying equipment, using the waste gas at the tail of the cement kiln to dry the sludge, and then send it to the cement firing system Incineration, this method requires tail gas treatment in the drying process, which requires a large investment

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