Method for reducing harmful components of flue gas by mechanical device

Abstract

The invention relates to a method for reducing harmful components by a mechanical device; the method is used for eliminating harmful components in kiln tail flue gas when in cement production; the kiln tail flue gas produced in a rotary kiln (1) sequentially passes through a kiln tail smoke chamber (2) and a decomposing furnace (4) and are exhausted out from downstream equipment; the method is characterized in that: the kiln tail flue gas is contacted with a mechanical device (3), the temperature on the surface of the mechanical device (3), which is beneficial to condensing the harmful components, is formed, so as to lead the harmful components to be condensed on the mechanical device (3) and lead the condensed harmful components to be discharged to outside. The mechanical device can be arranged at the downstream of the rotary kiln and can be arranged in the downstream equipment of the kiln tail smoke chamber (2), or decomposing furnace (4) or a preheater system according to the performance of the harmful components needed to be discharged. In the invention, the mechanical device and the kiln tail flue gas are contacted, the temperature on the surface of the mechanical device (3),which is beneficial to condensing the harmful components, is formed, so as to lead the harmful components to be condensed on the mechanical device, and then the condensed harmful components are discharged into the system by taking measures.

Description

technical field [0001] The invention relates to the field of cement production, in particular to a method for reducing the harmful components of flue gas by using a mechanical device. The method is used to solve the problem that the harmful components in the flue gas at the kiln tail are too high during cement production, which leads to the skinning blockage of the preheating and pre-decomposition system. problem. Background technique [0002] At present, for general cement production lines, it is required to control the alkali content, chlorine content or sulfur content contained in raw materials and fuels. These three components are collectively referred to as harmful components. Because harmful components not only affect the quality of cement, but also will be enriched in the high-temperature flue gas of the system during the cement production process, which will cause the system to be blocked and affect production; however, because the high-temperature calcination of cem...

AI Technical Summary

Problems solved by technology

In this way, not only will a lot of heat be lost, but also a bypass ventilation system will be added, which will increase a lot of investment and operating costs.

The deadliest thing is that it produces a large amount of waste materials containing harmful components that are difficult to deal with, and a large amount of nitrogen oxides are emitted in the gas, resulting in secondary pollution

Therefore, raw materials and fuels with harmful components exceeding the limit are not currently considered for use

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