Treatment method of carbon black tail gas

Abstract

The invention discloses a treatment method of carbon black tail gas, and the method comprises the steps: (1) washing off the H2O and H2S in the tail gas, collecting a waste liquid and carrying out neutralization treatment; (2) introducing the washed tail gas in a pressure swing adsorption device, drying, and adsorbing the moisture which is not fully dried in the tail gas; (3) introducing the dried tail gas in a temperature swing adsorption device and removing the H2S and SO2 impurities in the tail gas; (4) storing the tail gas in a nitrogen storage tank for application; and (5) introducing the treated carbon black tail gas in a tail gas header pipe for combustion. The method has the following advantages: (1) the energy consumption is reduced, and the benefits of enterprises are improved; (2) the internal capacities of a tail gas combustion furnace and a tail gas boiler are reduced, related supporting facilities are reduced, and the one-time investment is lowered; (3) the pollution of the waste gas to the atmosphere is avoided after tail gas combustion; (4) the generated nitrogen can be used for multiple industries, and new benefit growth points of the carbon black enterprises are created; and (5) the method is applicable to treatment of tail gas generated by various carbon black production methods.

Description

technical field [0001] The invention relates to a treatment method for tail gas, in particular to a treatment method for carbon black tail gas. Background technique [0002] Carbon black tail gas is produced by filtering carbon black flue gas through the main bag filter during carbon black production. The main components are (volume fraction): H 2 -12%, CO 9-13%, CO 2 2-3%,N 2 36-38%, H 2 O 36-40%; H 2 S( mg / m 3 ) 250-800 etc. The calorific value of exhaust gas is as low as 900-1000 kcal / m 3 . Since the existing carbon black enterprises do not process the tail gas, 30% of it is burned by the tail gas combustion furnace to provide the energy required for carbon black drying; 70% is burned by the low calorific value tail gas boiler to generate steam for the steam turbine to generate electricity. For production and civil use, its defects are: 1. Due to the low calorific value of the exhaust gas, the thermal efficiency of the exhaust gas combustion furnace and the exha...

AI Technical Summary

Problems solved by technology

Since the existing carbon black enterprises do not process the tail gas, 30% of it is burned by the tail gas combustion furnace to provide the energy required for carbon black drying; 70% is burned by the low calorific value tail gas boiler to generate steam for the steam turbine to generate electricity. For production and civil use, its defects are: 1. Due to the low calorific value of the exhaust gas, the thermal efficiency of the exhaust gas combustion furnace and the exhaust gas boiler is low, especially the low calorific value exhaust gas boiler needs a large internal volume to meet the needs of low calorific value exhaust gas combustion, resulting in a Large investment; 2. Because the tail gas contains H 2 S, without desulfurization treatment, the SO contained in the waste gas produced from the combustion of the tail gas combustion furnace and the tail gas boiler 2 , SO 3 directly discharged into the atmosphere, pollute the atmosphere, and cause harm to the environment