Mercury concentration on-line detection method in smoke gas

A detection method and technology of mercury concentration, which is applied in the direction of measuring devices, preparation of test samples, instruments, etc., can solve problems such as inability to analyze large-flow coal-fired flue gas, complicated detection process, and inability to realize online detection of mercury concentration, etc., to achieve Elimination of problems related to gold wire enrichment and cost-saving effect

Inactive Publication Date: 2010-10-20
CHONGQING UNIV
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  • Description
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Problems solved by technology

The above two methods cannot realize the online detection of mercury concentration in the flue gas, and the detection process is complicated, the error is large, and more importantly, it is impossible to analyze the large-flow coal-fired flue gas

Method used

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  • Mercury concentration on-line detection method in smoke gas
  • Mercury concentration on-line detection method in smoke gas
  • Mercury concentration on-line detection method in smoke gas

Examples

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Embodiment 1

[0028] In this embodiment, a bypass pipeline is set up in the coal-fired flue gas pipeline in the Dushi coal mining area of ​​Sichuan, and the gas flow controller is used to control the sampling gas flow rate in the bypass pipeline, and the coal-fired smoke in the Dushi coal mining area of ​​Sichuan is tested online by the method of the present invention. The mercury concentration in the air, the specific test steps are as follows:

[0029] (1) On-line sampling from the flue gas pipe through the bypass pipe, control the sampled flue gas to flow into the 20L water treatment solution in the graduated container at a flow rate of 20L / min, perform reaction and dust removal treatment, and start timing at the same time, at this time is 0; the water treatment solution in the scale container is a solution in which 1mol / L sodium acetate solution is added to deionized water to adjust the pH value to 3.8-4.2. Then, the flue gas after the water treatment solution reaction and dust removal ...

Embodiment 2

[0042] In this embodiment, a bypass pipeline is set up in the coal-fired flue gas pipeline of the Songzao Mine in Qijiang, Chongqing, and the sampling gas flow rate in the bypass pipeline is controlled by a gas flow controller, and the coal-fired smoke of the Songzao Mine in Qijiang, Chongqing is tested online by the method of the present invention. The mercury concentration in the air, the specific test steps are as follows:

[0043] (1) On-line sampling from the flue gas pipeline through the bypass pipe, control the sampled flue gas to flow into the 50L water treatment solution in the graduated container at a flow rate of 30L / min, perform reaction and dust removal treatment, and start timing at the same time, at this time is 0; the water treatment solution in the scale container is 10% by weight CaCO 3 solution. Then, the flue gas after the water treatment solution reaction and dust removal treatment is passed into the Zeeman effect mercury analyzer to detect the mercury co...

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Abstract

The invention provides a mercury concentration on-line detection method in smoke gas. The method of the invention comprises the following steps: carrying out on-line sampling in a smoke gas pipeline; firstly, using a water treatment solution for carrying out reaction and dust removal treatment on the smoke gas; then, introducing the treated smoke gas into a Zeeman effect mercury analysis instrument to be measured; and obtaining the total mercury concentration in the smoke gas through respectively measuring and calculating the water-soluble mercury concentration in the water treatment solution, the mercury concentration in the smoke gas after the reaction and dust removal treatment and the mercury concentration in insoluble smoke dust precipitates. The method adopts a method of on-line sampling and on-line test, does not influence the treatment of the actual engineering on the coal-fired smoke gas, and does not need spun gold enrichment preliminary treatment with high cost, so the relevant problems of spun gold enrichment can be eliminated, and the cost is saved. At the same time, the invention avoids the influence of the dust on the Zeeman effect mercury analysis instrument, trulyreflects the removal rate on the soluble mercury in the smoke gas in the wet method desulfurization process in coal-fired power plants, and has the directive significance to the demercuration purification of the coal-fired smoke gas in the actual engineering.

Description

technical field [0001] The invention relates to an online detection method for mercury concentration in coal-fired flue gas of a power plant, and belongs to the technical field of environmental protection. Background technique [0002] Mercury is one of the most volatile trace elements in coal, and the combustion of coal is the main source of mercury in the atmosphere. The mercury content in different regions and different coal types is different. The study found that the average mercury content of coal in my country is 0.22mg / Kg. my country's total fossil fuel resources are 4.16 trillion tons, of which coal accounts for 95.6%. For a long time, coal has been dominant in China's energy production and consumption structure, and this pattern will not change for a long period of time. Coal consumption in thermal power plants accounts for about 40% of coal consumption. Therefore, coal-fired power plants become the largest mercury pollution source, accounting for about 33% of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/00G01N1/34
Inventor 刘清才高威杨剑鹿存房保思敏董凌燕姚春玲刘浪
Owner CHONGQING UNIV
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