Method for incinerating sludge by using kiln tail system of cement plant

Abstract

The invention discloses a method for incinerating sludge by using a kiln tail system of a cement plant. A sludge atomization nozzle mounted on the kiln tail system of the cement plant is used for spraying sludge with the moisture content being 70-85 percent; the sludge can be atomized in the kiln tail system; water in the sludge can be instantly evaporated to be a part of waste gas, and a combustible substance is used as fuel for combustion; combusted residues serving as a part of a cement raw material enters a rotary kiln and is calcined into a cement clinker. According to the method, the defects of an existing sludge dry incineration technology can be overcome; a high-temperature environment of a cement production system is used for performing dry incineration, and the sludge is also used; powder contained in the kiln tail system can effectively suppress and absorb harmful gas released in a sludge incineration process, and the cement production energy consumption and the production cost are effectively reduced; therefore the method is more practicable and has industrial utilization value.

Description

technical field [0001] The invention belongs to the technical field of sludge treatment, and in particular relates to a method for burning sludge by using a kiln tail system of a cement factory. Background technique [0002] With the rapid development of my country's social economy and industrialization, the output of urban sewage has increased year by year. As a by-product of urban sewage treatment, the discharge of sludge has also increased rapidly. The harmless and resourceful treatment of sludge is imminent. However, in the process of treatment and utilization, a large number of organic pollutants and heavy metals enriched in sludge are very easy to cause secondary pollution to the environment. In addition, the water content of sludge discharged from various sewage treatment plants is as high as about 80%, which further increases the difficulty of treatment and utilization. [0003] Internationally, sludge disposal methods mainly include landfill, land use and incinerat...

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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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