Method for desulfurizing kiln tail smoke gas by calcium oxide in kiln tail smoke gas and system thereof

Abstract

The invention discloses a method for desulfurizing kiln tail smoke gas by calcium oxide in kiln tail smoke gas and a system thereof. The method comprises the following steps of taking out kiln tail smoke gas from a smoke chamber; then separating smoke ash containing calcium oxide from the kiln tail smoke gas, wherein the smoke ash containing calcium oxide can be used as a desulfurizing agent; feeding the desulfurizing agent into a preheater for desulfurizing kiln tail smoke gas. The system comprises the smoke chamber used for communicating a rotary kiln with a decomposing furnace; an air outlet of a decomposing furnace is communicated with an air inlet of the preheater; an air outlet of the smoke chamber is communicated with an air inlet of an air taking and heat taking device; the air outlet of the air taking and heat taking device is communicated with an air inlet of a cyclone separator; a discharging opening of the cyclone separator is communicated with the air inlet of the preheater. The kiln tail smoke gas can be effectively subjected to desulfurization treatment; the self-sufficiency effect of calcium oxide can be achieved; the cost of outsourcing of calcium oxide can be greatly reduced, or avoided; the cement production cost is greatly reduced.

Description

technical field [0001] The invention relates to a method and a system for producing cement by using sulfur- and / or calcium-containing raw materials, in particular to a method and a system for desulfurizing kiln tail flue gas by using calcium oxide in kiln tail flue gas. Background technique [0002] Such as figure 1 As shown, the cement kiln system in the prior art includes a smoke chamber 00-1 for connecting the rotary kiln 00 and the calciner 00-2, the air outlet of the calciner 00-2 is connected to the air inlet of the preheater C, The air outlet of the preheater C is connected to the air inlet of the desulfurization device 22, the air outlet of the desulfurization device 22 is connected to the air inlet of the cyclone separator 04, and the discharge port of the cyclone separator 04 is connected to the inlet of the elevator 23. Material outlet, the material outlet of the elevator 23 and the air inlet of the preheater C. When using cement raw meal to produce cement, in o...

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Problems solved by technology

After repeated analysis and research, the applicant finally found that although the kiln tail flue gas in the flue chamber contains more calcium oxide, the concentration of calcium oxide still cannot meet the desulfurization requirements, and the temperature of the kiln tail flue gas Very high, it is easier for sulfur to react with oxygen to form sulfur dioxide gas

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