Method for treating sludge by using cement kiln, and sludge gasifying cement kiln system

Abstract

The invention discloses a method for treating sludge by using a cement kiln, and a sludge gasifying cement kiln system. The method for treating sludge by using the cement kiln comprises the following steps: making wet sludge into dry sludge particles, then gasifying the dry sludge particles, sending the fuel gas obtained after gasification into a decomposing furnace, and sending ash obtained after gasification into a crude material system. The sludge gasifying cement kiln system comprises a cement kiln and a decomposing furnace, wherein an inlet of the cement kiln is communicated with an outlet of the decomposing furnace, and a gas inlet of the decomposing furnace is communicated with a gas outlet of a gasifying furnace through a fuel gas pipeline; a feed opening of the gasifying furnace is communicated with a warehouse through a conveying system, and a slag outlet of the gasifying furnace is communicated with the crude material system through a slagging system. According to the method and the sludge gasifying cement kiln system provided by the invention, the treatment scale of sludge can be greatly improved; the difference between the form of solid sludge directly sent to the kiln and the fineness of coal dust as well as a cement raw material is reduced, and the mass and heat transfer effect is increased.

Description

technical field [0001] The invention relates to a sludge disposal method and system, in particular to a method for disposing sludge with a cement kiln and a sludge gasification cement kiln system. Background technique [0002] The cement industry is one of the largest energy consumers in my country's industrial field, accounting for 6.5% of the country's total energy consumption. The fuel consumption of the cement industry accounts for 75% of the total energy consumption of the cement industry, while coal accounts for nearly 100% of the total fuel consumption. Seeking to use alternative fuels is in line with the strategy of my country's energy structure optimization and cement industry capacity replacement. [0003] With the construction of urban sewage treatment facilities, sewage sludge and sewer sludge have become a new urban environmental problem. The moisture content of the sludge after mechanical dehydration in the sewage plant is about 80%. Conventional landfill, ...

AI Technical Summary

Problems solved by technology

In the prior art, the main common point of using cement kiln to treat sludge is to transport the sludge from the sewage plant to the cement plant first, and then use the waste heat of the cement kiln to dry and deodorize the sludge and directly burn it into the decomposition furnace. Agglomeration and uneven distribution, small disposal scale, and high energy consumption

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