Method of purifying calcium carbide furnace gas

Abstract

The invention discloses a purifying method of calcium carbide furnace gas, which comprises the following steps: (1) leading high temperature furnace gas with 150-600mg / Nm3 oil tar and 100-150g / Nm3 from calcium carbide furnace through dust pelletizing system; lowing the temperature at 225-260deg.c; (2) leading to high temperature fan; boosting pressure at 10-25KPaG; washing in water scrubber; lowing furnace temperature at 20-50 deg.c; lowing oil tar content to 1-100ppm; lowing dust content to 1-5mg / Nm3; (3)leading furnace gas from water scrubber through air collector front water-sealing, screw-type dish gas holder and air collector back water-sealing; getting the product. This can low accommodation area and investment.

Description

technical field [0001] The invention relates to a method for purifying calcium carbide furnace gas. Background technique [0002] Coke and lime, the raw materials produced by calcium carbide, produce calcium carbide under the action of resistance arc heat, and also produce a large amount of furnace gas. The furnace gas temperature from the calcium carbide furnace is about 600-800°C, and the instantaneous maximum temperature can reach 1000°C, with high calorific value. It can be used as fuel for charcoal drying hot blast stoves, gas-fired lime kilns, power plants, boilers and other equipment. It enables energy recovery and reuse, realizes circular economy, and increases product added value. [0003] Calcium carbide furnace gas contains 70-90% CO, H 2 5~7%, O 2 0.2~0.6%, CO 2 2~5%, CH 4 0~5%, N 2 1~4%, tar 150~600mg / Nm 3 , Dust 100~150g / Nm 3 . It has the characteristics of high temperature, flammability, explosion, dust stickiness and blockage. [0004] Gas-fired li...

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Problems solved by technology

[0006] 2. When the temperature of the furnace gas is ≤225°C, the tar in the furnace gas reaches the freezing point and precipitates, causing the pipe to stick to coke and the diameter of the pipe gradually becomes smaller, which affects the furnace gas transportation

[0011] The above two wet purification methods use water directly to lower the temperature of the furnace gas from 600 to 800°C to normal temperature, and perform dust removal and tar removal treatment. Although the furnace gas can be purified, the furnace gas mainly relies on turbid circulating water to cool down. , the temperature difference is relatively large, and the water consumption is relatively large

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