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Method for testing content of hydrogen cyanide in gas

A method of determination, hydrogen cyanide technology, applied in the field of coal coking analysis and testing, can solve the problems of waste liquid pollution, toxic and harmful reagents, time-consuming, etc., and achieve the effect of accurate determination

Inactive Publication Date: 2012-08-15
云南昆钢煤焦化有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the problems in the prior art that the reagents are toxic and harmful, the analysis steps are complicated, time-consuming, and the waste liquid is seriously polluted, the present invention provides a method for determining the content of hydrogen cyanide in coke oven gas

Method used

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  • Method for testing content of hydrogen cyanide in gas
  • Method for testing content of hydrogen cyanide in gas
  • Method for testing content of hydrogen cyanide in gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) In two bottles filled with potassium hydroxide solution with a mass concentration of 30% and a volume of 50mL, feed gas in sequence up to the gas sampling volume , and combine two bottles of absorption liquid to obtain 100mL of sample absorption liquid that absorbs hydrogen cyanide; among them, the gas sampling volume Calculated by the following formula:

[0032]

[0033] gas sampling volume It is measured by a conventional wet gas flowmeter, the specific value is 110L (behind the tower), and the correction coefficient of the wet gas flowmeter 0.91, the average temperature of the gas when sampling Atmospheric pressure at 11.0°C when sampling 81.22KPa, the gas pressure at the time of sampling is 0 KPa, and the saturated water vapor pressure W at t℃ is 1.303 KPa, the calculated For 80.05L:

[0034] (2) Dilute the sample absorption solution obtained in step (1) to 250mL with water, shake well to obtain the sample dilution, take 10.00mL of the sample di...

Embodiment 2

[0045] (1) In two bottles filled with potassium hydroxide solution with a mass concentration of 35% and a volume of 60mL, feed gas in sequence up to the gas sampling volume , combine two bottles of absorption liquid to obtain the sample absorption liquid that absorbs hydrogen cyanide; among them, the gas sampling volume Calculated by the following formula:

[0046]

[0047] gas sampling volume It is measured by a conventional wet gas flowmeter, the specific value is 100L (behind the tower), and the correction coefficient of the wet gas flowmeter 0.91, the average temperature of the gas when sampling Atmospheric pressure at 6°C when sampling 81.53 KPa, the gas pressure at the time of sampling The saturated water vapor pressure W at 0 KPa and t°C is 0.935 KPa, calculated For 74.73 L:

[0048] (2) Dilute the sample absorption solution obtained in step (1) to 250mL with water, shake well to obtain the sample dilution, take 10.00mL of the sample dilution, and add cad...

Embodiment 3

[0059] (1) In two bottles filled with potassium hydroxide solution with a mass concentration of 40% and a volume of 55mL, feed gas up to the gas sampling volume , must absorb the sample absorbing liquid containing hydrogen cyanide; among them, the gas sampling volume Calculated by the following formula:

[0060]

[0061] Among them, the gas sampling volume It is measured by a conventional wet gas flowmeter, and the specific value is 60L (in front of the tower), the correction coefficient of the wet gas flowmeter 0.92, the average temperature of the gas when sampling Atmospheric pressure at 10°C when sampling The gas pressure at the time of sampling is 81.20 KPa The saturated water vapor pressure W at 0 KPa and t°C is 1.228 KPa, calculated For 44.34L:

[0062] (2) Dilute the sample absorption solution obtained in step (1) to 250mL with water, shake well to obtain the sample dilution, take 10.00mL of the sample dilution, and add cadmium acetate solution dropwise...

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Abstract

The invention provides a method for testing content of hydrogen cyanide in gas. The method comprises the following steps of: absorbing the hydrogen cyanide in the gas by adopting a potassium hydroxide solution, transferring the absorption solution to a volumetric flask with a certain volume, taking a certain amount of absorption solution, adding a cadmium acetate solution to make sulfide in the absorption solution to form indissolvable cadmium sulfide to sediment, filtering and sintering the absorption solution to eliminate the sediments, taking Dabr as an indicator of the solution, taking a standard silver nitrate solution to titrate, making cyanide ions react with silver nitrateto form soluble cyanide complex ion (Ag(CN)2), making excessive silver ions react with the Dabar indicator so as to make the color of the solution change from yellow to orange to the end, and calculating the content of the hydrogen cyanide according to the volume of the consumed standard silver nitrate solution. The method provided by the invention solves the problems that various kinds of reagents used in the prior art are poisonous and harmful, and moreover the reagents have the disadvantages of complex analysis step, long elapsed time and the like, have potential safety hazards existing in the testing process, and enhance the sewage treatment load of the back section. The method can rapidly and accurately test the content of the hydrogen cyanide in coke oven coal.

Description

[0001] technical field [0002] The invention relates to a measuring method, in particular to a measuring method for hydrogen cyanide content in coke oven gas, and belongs to the technical field of coal coking analysis and testing. Background technique [0003] Although the contents of hydrogen sulfide and hydrogen cyanide in coke oven gas are small, they are harmful components and must be removed. In the coke oven gas purification process, in order to remove hydrogen cyanide while removing hydrogen sulfide in coke oven gas, it is necessary to measure the gas before entering the desulfurization tower and the gas coming out of the desulfurization tower, so as to Determine the removal of hydrogen cyanide in the gas, therefore, the measurement data is an important indicator of gas purification. However, in the prior art, since there is no national standard or industry standard for the determination method of hydrogen cyanide content in gas, it brings a lot of inconvenience to ...

Claims

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Application Information

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IPC IPC(8): G01N31/16
Inventor 尹思聪张丕祥龙菊兴徐东升毛艾萍王自芳张少平王健
Owner 云南昆钢煤焦化有限公司
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