Method for analyzing trace hydrogen sulfide in coal gas

An analytical method and technology for hydrogen sulfide, which are applied in separation methods, chemical instruments and methods, analytical materials, etc., can solve the problems such as oxygen is not easy to undergo chemical reactions, the amount of particulate matter cannot be accurately judged, and the detection requirements cannot be met. High accuracy and sufficient gas absorption effect

Pending Publication Date: 2022-07-29
ANGANG STEEL CO LTD
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  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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  • Method for analyzing trace hydrogen sulfide in coal gas
  • Method for analyzing trace hydrogen sulfide in coal gas
  • Method for analyzing trace hydrogen sulfide in coal gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] See Figure 1-Figure 3 , using deionized water to prepare a mixed solution of NaOH and KOH, wherein the percentage concentration of NaOH is 2%, and the percentage concentration of KOH is 2%. Take 4L as the absorption solution, and measure the H in the absorption solution 2 S concentration, denoted as W 1 , in μg / mL. At the gas production point of a steel plant, add the configured absorption liquid into the absorber tank, so that the liquid level of the absorption liquid reaches more than 1 / 2 of the height of the tank. according to figure 1 The gas inlet, suction pump I, flow meter, gas storage bag I, suction pump II, absorber, gas storage bag II, suction pump III, and gas storage bag I are connected in sequence with gas delivery pipes, respectively. Connect the absorber, the liquid volume meter, and the liquid composition analyzer in this order. Record the initial value of the flow meter, denoted as V 1 , unit L, open the air pump I, open the valve at the gas inlet...

Embodiment 2

[0047] See Figure 1-Figure 3 , using deionized water to prepare a mixed solution of NaOH and KOH, wherein the percentage concentration of NaOH is 5%, the percentage concentration of KOH is 1%, take 4L as the absorption liquid, and measure the H in the absorption liquid 2 S concentration, denoted as W 1 , in μg / mL. At the gas production point of a steel plant, add the configured absorption liquid into the absorber tank, so that the liquid level of the absorption liquid reaches more than 1 / 2 of the height of the tank. See figure 1 , the gas inlet, the gas pump I, the flow meter, the gas storage bag I, the gas pump II, the absorber, the gas storage bag II, the gas pump III, and the gas storage bag I are connected in sequence with the gas delivery pipe, and the liquid delivery pipe is used. Connect the absorber, liquid volume measuring instrument, and liquid component analysis equipment in sequence. Record the initial value of the flow meter, denoted as V 1 , unit L, open th...

Embodiment 3

[0054] See Figure 1-Figure 3 , using deionized water to prepare a mixed solution of NaOH and KOH, wherein the percentage concentration of NaOH is 3.5%, and the percentage concentration of KOH is 1.5%. Take 4L as the absorption solution, and measure the H in the absorption solution 2 S concentration, denoted as W 1 , in μg / mL. At the gas production point of a steel plant, add the prepared absorption liquid into the absorber reaction tank, so that the liquid level of the absorption liquid reaches more than 1 / 2 of the height of the tank. A three-way pipeline is placed at the gas inlet, and the gas inlet is divided into two branches, namely branch 1 and branch 2. Branch 1 adopts gas delivery pipe according to figure 1 Connect with the air pump I, and then connect the air pump I with the flow meter, the air storage bag I, the air pump II, the absorber, the air storage bag II, the air pump III, and the air storage bag I in sequence, and use the liquid delivery pipes to respectiv...

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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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N7/04G01N33/00B01D53/52B01D53/78C10K1/12
CPCG01N7/04G01N33/0044B01D53/78B01D53/52C10K1/122
Inventor 钱峰侯洪宇徐鹏飞马光宇孙杭邓军华张杰亢德华于淑娟宋世哲
Owner ANGANG STEEL CO LTD
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