Method for analyzing trace hydrogen sulfide in coal gas

Abstract

The invention relates to a method for analyzing trace hydrogen sulfide in coal gas, which comprises the following steps: 1) preparing an absorption liquid: measuring the H2S concentration of the absorption liquid which is a mixed solution of NaOH and KOH, and putting the absorption liquid into a reaction tank at a position where the liquid level of the absorption liquid is not lower than half of the height of the tank body; (2) sequentially connecting a coal gas inlet, a sucking pump I, a flow meter, a gas storage bag I, a sucking pump II, an absorber, a gas storage bag II, a sucking pump III and a gas storage bag I through gas conveying pipes; the absorber, the liquid volume measuring instrument and the liquid component analysis equipment are sequentially connected through a liquid conveying pipe; 3) carrying out online absorption on hydrogen cyanide in the coal gas; 4) completely discharging the absorption liquid out of the absorber, and measuring the volume of the absorption liquid and the concentration of H2S; and 5) calculating the H2S concentration. The method has the advantages that the to-be-detected gas is circulated for multiple times, the hydrogen sulfide in the coal gas is completely absorbed, and the method is extremely high in accuracy, low in cost and high in efficiency.

Description

technical field [0001] The invention belongs to the field of gas detection, in particular to a method for analyzing trace hydrogen sulfide in gas. Background technique [0002] Iron and steel enterprises generally use self-produced blast furnace and coke oven gas as fuel gas for heating furnaces. In recent years, a large number of blockages have appeared in the gas filters in the heating furnace gas pipelines of some iron and steel enterprises, which seriously affected the smooth production. After investigation, the blockage on the filter screen of the gas pipeline is a corrosion product, and the main components are elemental sulfur and ammonium chloride. After analysis, the source of sulfur is mainly H in the gas 2 S is produced by chemical reaction during transportation. It can be seen that the H in the gas 2 The existence of S caused serious harm to production. [0003] The coke oven gas generally enters the desulfurization process for treatment before use, so the H ...

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Problems solved by technology

During the spraying process, the small spray droplets and the SO in the airflow 3 Molecular collision produces chemical reaction, which can effectively reduce SO in the exhaust gas 3 content, but the device can only partially absorb the SO in the flue gas 3 , so that the exhaust tail gas meets the environmental protection emission requirements, and it is impossible to achieve SO 3 The total absorption, and thus can not meet the detection requirements

The patent application number CN201921879172.5 discloses an asphalt fume absorption device, which is only suitable for the absorption of toxic substances in the flue gas discharge process, but not for content analysis and detection after the absorption of toxic substances in the flue gas. Because during the absorption process of the device, the amount of particulate matter in the bitumen flue gas that chemically reacts with oxygen cannot be accurately judged

Moreover, the device can only absorb the particulate matter in the asphalt flue gas, and some gas components in the flue gas, such as H 2 S, hydrogen chloride, etc., do not easily react with oxygen, so they cannot be absorbed

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