Device for indirectly drying and utilizing sludge by cement kiln waste gas and process method thereof

Abstract

The invention discloses a device for indirectly dying sludge by virtue of advantages of cement kiln production and then burning the dried sludge through a cement kiln. The technical route of the invention is as follows: saturated steam is generated by virtue of the heat of cement kiln waste gas; the low-pressure saturated steam flows into the jacket of a hollow paddle drying machine enclosure and the inner cavity of a paddle shaft; a machine body and the paddle shaft are indirectly heated at the same time by virtue of the latent heat of the saturated steam so as to heat and dry the sludge in a conductive heating manner; and the dried sludge is transported to a decomposing furnace or a smoke chamber for burning to substitute for part of fuel, and then the dried sludge is sent to the decomposing furnace for burning after tail gas treatment. The process method of the invention has the obvious characteristics of no secondary pollution, lower investment and low operating cost; the method utilizes the heat of the cement kiln waste gas, can substitute for part of the fuel and raw materials, and achieve the purpose of recycling, reduction and harmlessness; and the method complies with the market demands and the economical development requirements, and accords with the requirements for saved energy, low-carbon economy and environmental protection.

Description

technical field [0001] The patent of the present invention relates to the field of waste disposal and utilization, and specifically relates to the use of advantages in cement production to dispose of various wastes so as to achieve the goals of harmlessness, resource utilization and reduction. Background technique [0002] At present, there are two main technologies for sludge treatment in cement kilns that have been built or are under construction in China. One is to use the technology of directly incinerating sludge in cement kilns, and send the sludge directly to the smoke chamber or decomposition furnace for incineration. The existing problems are: due to the high water content and low calorific value of the sludge, it needs to consume a large amount of auxiliary fuel, the energy consumption is high, and the amount of sludge treated is limited; the second is to use the flue gas to directly dry the sludge and then incinerate it in a cement kiln. The existing problems of ...

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to overcome the shortcomings of using cement kiln to directly incinerate sludge and using flue gas to directly dry sludge and then burn it, to provide a new method for sludge disposal, and to reduce investment and operating costs , make full use of the latent heat of the steam generated by the waste gas of the cement kiln, the heat medium steam will not be polluted, only a small amount of gas is needed, the control, purification and odor elimination of the gas are relatively easy, and the pollution is completely eliminated

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