A system and method for removing dioxin from fly ash based on cement kiln
A cement kiln and fly ash technology, applied in furnaces, lighting and heating equipment, waste heat treatment, etc., can solve problems such as difficulty in adapting to the high flue gas temperature of cement kilns, and increase the complexity of system control, so as to avoid pollution Effect
Active Publication Date: 2022-03-25
北京四方联新技术开发有限公司
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Problems solved by technology
However, the above scheme ignores the problem of pressure difference between the various equipment in the overall operation of the system. The pressure difference between the two points of the existing equipment of the cement kiln involved in the use is less than the additional pressure difference demand generated by the resistance of the newly added equipment, that is The hot air generated by the operation of the cement kiln cannot be directly transported as expected through the pressure difference between the equipment, and the additional air induction equipment will not only not be able to adapt to the high flue gas temperature of the cement kiln, but will also increase the overall equipment investment and design difficulty of the system. Increasing the complexity of system control makes it extremely difficult to implement these existing technologies, which is not conducive to the economy of fly ash reuse
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[0029] In order to understand the content of the present invention more clearly, detailed description will be given in conjunction with the accompanying drawings and embodiments.
[0030] like figure 1Shown is the schematic diagram of the fly ash dioxin removal system based on the cement kiln of the present invention, including the hot air intake pipe 1 of the smoke chamber, the dioxin removal pipe 2, the heat exchange desorber 3, the fly ash cooler 4, the fly ash inlet 5. A device 7 for preventing dioxin resynthesis and at least one set of out-of-stock spray guns 6 . The smoke chamber hot air intake pipe 1 is a pipe with a constriction at one end, and the constricted end of the smoke chamber hot air intake pipe 1 is connected to the bottom end of the dioxin removal pipe 2, and the other end is connected to the cement kiln. The kiln tail smoke chamber 9, the high temperature flue gas in the kiln tail smoke chamber 9 enters the dioxin removal pipe 2 in a puff shape through the...
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The invention relates to a cement kiln-based fly ash dioxin removal system and method, making full use of the kiln tail smoke chamber in the original cement kiln equipment and the bottom stage of the multi-stage preheater closest to the kiln tail smoke chamber for preheating The pressure difference between the devices enables the fly ash dioxin removal system to operate smoothly under the drive of the existing pressure difference of the equipment without the need for additional air induction equipment. The overall structure cost is low and it is easy to retrofit on the existing cement kiln. The economic benefit of fly ash reuse is high.
Description
technical field [0001] The invention relates to the technical field of environmental protection equipment, in particular to a system and method for removing dioxins from fly ash based on a cement kiln. Background technique [0002] Garbage fly ash is classified as hazardous waste due to its high content of heavy metals and dioxin toxicity. The traditional disposal method of garbage fly ash is to enter the hazardous waste safe landfill. In recent years, my country has achieved some research results on the comprehensive disposal of waste fly ash. The main components of waste fly ash produced by waste incineration are basically similar to cement clinker, which can replace some of the raw materials in cement production (such as clay, limestone, etc.). If the toxic and harmful substances such as dioxins contained in fly ash can be effectively removed, the full reuse of fly ash can be achieved, which not only reduces the pressure of waste treatment, but also reduces the cost of ra...
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IPC IPC(8): F27D17/00F27D13/00
CPCF27D17/008F27D17/004F27D17/00F27D13/002
Inventor 陈晓东高玉宗高生
Owner 北京四方联新技术开发有限公司