Method for increasing concentration of carbon dioxide in flue gas

Abstract

The invention discloses a method for increasing the concentration of carbon dioxide in flue gas. The method comprises the following steps: calculating the total amount of the flue gas and the contentof a CO2 component in the total amount of the flue gas; calculating the air flow which needs to be reduced to input into a kiln and the amount of pure oxygen used for replacement; calculating the amount of the flue gas needing to be doped; simultaneously inputting a part of circulating flue gas of lime kiln flue gas and the replaced pure oxygen into the kiln through an air input port meeting the calcining process requirement according to the amount of the flue gas needing to be doped; and sending the rest flue gas to the next recovery process. According to the method for increasing the concentration of the carbon dioxide in the flue gas, pure oxygen and the flue gas are used for replacing part of combustion-supporting air, the proportion of the pure oxygen to the flue gas is adjustable, the influence of fuel heat value deviation on the combustion temperature can be compensated in a large range by increasing and decreasing the amount of the backflow flue gas, without losing the heat efficiency of the kiln, and the proportion of various substances in the lime kiln flue gas is hardly influenced by increasing or decreasing the amount of the backflow flue gas.

Description

technical field [0001] The invention relates to a lime kiln flue gas treatment technology, in particular to a method for increasing the concentration of carbon dioxide in the flue gas. Background technique [0002] Limestone (mainly composed of CaCO 3 ) will release a large amount of CO during the calcination process 2 , about 400Nm3 of CO will be produced for every ton of lime produced 2 gas. plus CO from fuel combustion 2 , CO emitted to the atmosphere during lime production 2 The amount is quite considerable. On the other hand, CO 2 It has important uses in many fields such as industrial and agricultural production. But the problem is that the CO in the flue gas of most lime kilns currently 2 The concentration is only 25% to 45%. The difference depends mainly on the type of fuel used and how the kiln works. Because CO 2 The concentration is too low, so the utilization value is not high. In the field of environmental protection, the method of carbon sequestrati...

AI Technical Summary

Problems solved by technology

In the field of environmental protection, the carbon sequestration method to treat flue gas with low CO2 concentration also pays a high economic price

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