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A kind of determination method of hydrogen cyanide in coke oven gas

A coke oven gas and determination method technology, which is applied in the direction of measuring devices, preparation of test samples, chemical analysis by titration, etc., can solve the problems of complex steps, long time-consuming, toxic and harmful, etc., so as to improve the accuracy of analysis, Effect of shortened analysis cycle and high hydrogen sulfide content

Active Publication Date: 2022-07-05
SICHUAN DAXING ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is no national standard or industry standard for measuring hydrogen cyanide content. The most commonly used method is the ammonium polysulfide method. This method is the most classic method for the determination of hydrogen cyanide in gas. It has high accuracy, but this method has complicated steps and takes a long time. The production cannot be guided in time, and many reagents are used, and many reagents are poisonous and harmful, which affects the physical and mental health of the test personnel

Method used

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  • A kind of determination method of hydrogen cyanide in coke oven gas
  • A kind of determination method of hydrogen cyanide in coke oven gas
  • A kind of determination method of hydrogen cyanide in coke oven gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The assay method of hydrogen cyanide in the coke oven gas of the present embodiment comprises:

[0033] (1) Calibrate the wet gas flowmeter, connect it with the gas pipeline and disperse the gas for 5 minutes, and connect the gas pipeline, the pretreatment gas cleaning bottle with lead acetate solution, the sampling gas cleaning bottle with sodium hydroxide solution, and the wet gas flowmeter. Connected in turn through the gas pipe; the concentration of the lead acetate solution is 40g / L, and the volume is 120mL, and the concentration of the sodium hydroxide solution is 15wt%, and the volume is 120mL;

[0034] Open the valve set on the gas pipeline, pass the gas into the pretreatment gas washing bottle and the sampling gas cleaning bottle in turn for sampling, control the gas flow rate to be 1L / min, and the sampling volume to be 50L. After sampling, record the wet Gas flow meter readings and gas temperature and pressure;

[0035] (2) All the absorbing liquids in the sa...

Embodiment 2

[0047] The assay method of hydrogen cyanide in the coke oven gas of the present embodiment comprises:

[0048] (1) Calibrate the wet gas flowmeter, connect it with the gas pipeline and disperse the gas for 10 minutes, and connect the gas pipeline, the pretreatment gas cleaning bottle with lead acetate solution, the sampling gas cleaning bottle with sodium hydroxide solution, and the wet gas flowmeter. Connected in turn through the gas pipe; the concentration of the lead acetate solution is 60g / L, and the volume is 80mL, and the concentration of the sodium hydroxide solution is 25wt%, and the volume is 80mL;

[0049] Open the valve set on the gas pipeline, pass the gas into the pretreatment gas washing bottle and the sampling gas cleaning bottle in turn for sampling, control the gas flow to be 2L / min, and the sampling volume to be 60L. After sampling, record the wet type Gas flow meter readings and gas temperature and pressure;

[0050] (2) All the absorbing liquids in the sam...

Embodiment 3

[0062] The assay method of hydrogen cyanide in the coke oven gas of the present embodiment includes:

[0063] (1) Calibrate the wet gas flowmeter, connect it with the gas pipeline and disperse the gas for 8 minutes, and connect the gas pipeline, the pretreatment gas cleaning bottle containing lead acetate solution, the sampling gas cleaning bottle containing sodium hydroxide solution, and the wet gas flowmeter Connected in turn through the gas pipe; the concentration of lead acetate solution is 50g / L, and the volume is 100mL, and the concentration of sodium hydroxide solution is 20wt%, and the volume is 100mL;

[0064] Open the valve set on the gas pipeline, pass the gas into the pretreatment gas washing bottle and the sampling gas cleaning bottle in turn for sampling, control the gas flow rate to be 1.5L / min, and the sampling volume to be 55L. After sampling, record the The readings of the wet gas flow meter and the temperature and pressure of the gas;

[0065] (2) All the a...

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Abstract

The invention discloses a method for measuring hydrogen cyanide in coke oven gas, and belongs to the technical field of coke oven gas analysis and measurement. The method can simply and quickly measure the hydrogen cyanide content in the gas after the fine desulfurization tower by silver nitrate titration; the hydrogen sulfide content in the gas before the desulfurization tower is high, and the reduction of the gas absorption and the increase of the pre-lead acetate absorption liquid can also be used. Measure the hydrogen cyanide content in the gas before the desulfurization tower. Using the silver nitrate titration method to measure the hydrogen cyanide content in the gas can meet the daily analysis needs of the factory and effectively guide the production. Due to the small solubility product constant of lead acetate, it is ideal to use lead acetate to remove the interference of hydrogen sulfide.

Description

technical field [0001] The invention relates to the technical field of analysis and detection of coke oven gas, in particular to a method for determining hydrogen cyanide in coke oven gas. Background technique [0002] Although the content of hydrogen cyanide in coke oven gas is not large, it is highly toxic and generates NOX during combustion, which must be removed in the process of gas purification. As an important indicator in the process of gas purification, the determination of cyanide content in gas must be be measured and monitored. There is no national standard or industry standard for measuring the content of hydrogen cyanide. The most commonly used method is the ammonium polysulfide method, which is the most classic method for the determination of hydrogen cyanide in coal gas, with high accuracy, but this method has complicated steps and takes a long time. The production cannot be guided in time, many reagents are used, and many kinds of reagents are toxic and har...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N31/16G01N1/34G01N1/40G01N1/44
CPCG01N31/16G01N1/34G01N1/4022G01N1/405G01N1/44
Inventor 苏召飞蒋淑敏张光辉徐苇
Owner SICHUAN DAXING ENERGY CO LTD
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