Method for removing CO2 from blast furnace clean coal gas by using ionic liquid
A technology of ionic liquid and clean gas, which is applied in the direction of liquid washing gas purification, etc., to achieve the effects of strong solubility, easy desorption and regeneration, and avoiding secondary pollution
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[0024] Example 1
[0025] Removal of CO from net blast furnace gas with ionic liquid 2 Method such as figure 1 As shown, the blast furnace net gas flow path is as follows:
[0026] After dedusting, the blast furnace gas whose temperature is between 20℃~90℃, CO 2 The gas content is 393g / m 3 , Enter the tower from the air inlet 9 below the primary absorption tower 2. There is a gas distribution device in the tower, and the pressure in the tower is 0.01MPa~0.03MPa. The net blast furnace gas passes through the packing layer and passes through the gas outlet 14 above the primary absorption tower 2. Will be absorbed CO 2 After the net blast furnace gas is fed into the tower from the gas inlet 13 below the secondary absorption tower 3, it is absorbed again in the tower. There is a gas distribution device in the secondary absorption tower 3, and the net blast furnace gas passes through the packing layer to remove CO 2 The net blast furnace gas is discharged from the gas outlet 8 of the sec...
Example Embodiment
[0029] Example 2
[0030] The ionic liquid absorbent adopts the imidazole amino acid ionic liquid N-methyl-N-n-butaneimidazole glycinate, the ratio of the amount of ionic liquid to the net gas substance of blast furnace is 18~2.6:1, primary absorption tower and secondary absorption tower All choose a packed tower with Pall rings as packing. The upper part of the two absorption towers is a liquid inlet pipe with a liquid distribution device, and the lower part is an air inlet with a gas distribution device. The desorption tower is a combined spray and plate tower. The other content of this embodiment is the same as that of embodiment 1. This embodiment CO 2 The removal rate is over 84.7%.
Example Embodiment
[0031] Example 3
[0032] The ionic liquid absorbent adopts ammonium salt amino acid ionic liquid tetramethylammonium lysine salt, and the ratio of the amount of ionic liquid to the net gas substance of the blast furnace is 20~3:1. Both the primary absorption tower and the secondary absorption tower select packed towers. , With Pall ring as packing. The upper part of the two absorption towers is a liquid inlet pipe with a liquid distribution device, and the lower part is an air inlet with a gas distribution device. The desorption tower is a spray tower. The other content of this embodiment is the same as that of embodiment 1. This embodiment CO 2 The removal rate is above 80.5%.
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