Device and method for recycling waste ammonia gas in arsenic coking process

Abstract

The invention discloses a device and method for recycling waste ammonia gas in an arsenic coking process, and belongs to the technical field of ammoniation desulfuration and coking. The method for recycling the waste ammonia gas in the arsenic coking process comprises the following steps that 1, the waste ammonia gas at the top of a fixed ammonia tower is guided out; 2, pressure of the top of the ammonia tower is regulated; 3, liquid and solid which are carried in the waste ammonia gas are separated; 4, the concentration of ammonium hydroxide is regulated; 5, the ammonia gas is condensed and cooled to the temperature suitable for storage and conveying, and then the ammonia gas is conveyed to a strong ammonium hydroxide storage tank; 6, diffusion ammonia gas at the top of the strong ammonium hydroxide storage tank is recycled; 7, a little of oil matter included in the ammonium hydroxide is filtered out; 8, the ammonium hydroxide with the standard quality is recycled. According to the method for recycling the waste ammonia gas in the arsenic coking process, the ammonia gas including the waste ammonia gas can be recycled, and production cost is saved.

Description

technical field [0001] The invention relates to the technical field of ammonification desulfurization and coking, in particular to a device and method for recovering waste ammonia gas in the coking arsenic process. Background technique [0002] Some domestic coking companies adopt the AS gas recovery process, and their fixed ammonia towers produce a large amount of waste gas containing 20-30% (w / w) ammonia per hour. This waste gas used to use the ammonia incineration process, that is: under the action of a catalyst, after being burned in the ammonia incinerator, the high-temperature waste gas at about 1050 °C enters the waste heat boiler to generate steam, and then the waste gas is further cooled and washed and returned to the gas In the gas pipe before the blower. This process consumes a lot of coke oven gas, and the annual replacement cost of ammonia incinerator catalyst is also very expensive. After combustion, a large amount of exhaust gas enters the coke oven gas syste...

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Problems solved by technology

This process consumes a lot of coke oven gas, and the annual replacement cost of ammonia incinerator catalyst is also very expensive. After combustion, a large amount of waste gas enters the coke oven gas system, which reduces the calorific value of coke oven gas and increases the gas blower. Load, cooling water is consumed to cool this waste gas, and the process of ammonia incineration device and subsequent waste gas cooling and washing device is complicated, and the material requirements are very high. The main pipes and equipment are mainly made of titanium.

[0003] In the prior art, the sintered ammonia flue gas desulfurization technology is widely used, but the ammonia desulfurization process must purchase liquid ammonia as a desulfurizer. Due to the high price of liquid ammonia, the operating cost of sintering desulfurization is also high

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