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Multi-pass gas-liquid phase absorption type trace element collection system and collection method

A trace element and collection system technology, applied in measurement devices, sampling devices, instruments, etc., can solve the problem of trace elements enrichment in filter membranes and filter membrane blockages, affecting test accuracy, sampling system stability, and affecting test results. Accuracy and other issues, to achieve the effect of eliminating the defects of lax sealing, full function and low cost

Pending Publication Date: 2022-02-11
北京华能长江环保科技研究院有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the concentration of trace elements such as mercury, arsenic, and lead in flue gas is detected by the method recommended by the American Society for Mechanical Materials and the US Environmental Protection Agency. This method uses a series of impact bottles (7 groups) for chemical solvent absorption, and then absorbs the solution Analyzing and testing to calculate the concentration of trace elements in the flue gas, but this method has some serious defects: 1. The liquid-gas contact reaction time in the impact bottle is short, which may easily cause trace elements to escape and bring negative deviations to the test results; 2. The group impact bottle is not tightly sealed, and it is easy to leak air, which affects the accuracy of the test results; 3. The sampling flue gas passes through the filter membrane vertically to remove the fly ash, which leads to the enrichment of trace elements on the filter membrane and the blockage of the filter membrane, affecting the accuracy of the test results. Test accuracy and sampling system stability

Method used

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  • Multi-pass gas-liquid phase absorption type trace element collection system and collection method

Examples

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Embodiment 1

[0034] A multi-pass gas-liquid phase absorption trace element collection system, which consists of: a sampling head 1, one end of a pitot tube 2 is fixed on the sampling head, and a differential pressure gauge 4 is installed at the other end of the pitot tube , the sampling head is connected to the accelerating tube 5 through a connecting pipeline, the connecting pipeline wraps the heating layer 3 outside, and the accelerating tube sticks to the wall and extends into the fly ash separator 6 along a tangent, the described A separation cylinder 8 is installed above the fly ash separator, and a filter membrane 7 is installed at the bottom of the separation cylinder. The bottom of the separation cylinder is connected to the impact tube 9 through a connecting pipe, and the impact tube is installed in the mixing reactor. In 17, the mixing reactor is sequentially installed with a primary mixing hood 10, a secondary mixing hood 11, a primary mixing pan 12, a secondary mixing pan 13, an...

Embodiment 2

[0036] According to the multi-pass gas-liquid phase absorption trace element collection system described in Example 1, the top of the mixing reactor is connected to one end of the drying box 18 through a connecting pipe, and the other end of the drying box is connected to the pressure gauge 20, Thermometer 21, flowmeter 22, vacuum pump 23, described vacuum pump is connected with evacuation pipe 24, and described dry box interior is equipped with 3 partitions 19 successively, and described partitions are arranged in parallel, and described mixing reactor A drain valve 16 is connected below, and the liquid level 15 is set on the upper part of the three-stage mixing plate.

[0037]The diameter of the accelerating tube is smaller than that of the previous pipeline, and the wall is attached to the inside of the separator along a tangent line. The lower part of the separating cylinder is covered with a detachable cylindrical filter membrane. The mixing reactor is equipped with 5% (V...

Embodiment 3

[0051] According to the collection method of the multi-pass gas-liquid phase absorption type trace element collection system described in embodiment 1-2, the method comprises the following steps:

[0052] Step 1: Add 5% HNO to the Mixed Reactor 3 and 10%H 2 o 2 Absorbing liquid, from the liquid level to the top 20mm of the third-stage mixing plate, fill the drying box with dried water-absorbing and discoloring silica gel particles;

[0053] Step 2: Block the sampling head with the rubber rod, turn on the vacuum pump to evacuate the system, turn off the vacuum pump when the vacuum degree of the pressure gauge is 50kPa, observe for 5 minutes, the pressure does not drop, the system leakage rate is not more than 3%, and the airtightness of the system is qualified; otherwise, Carry out a leak check on the sampling system, and the next step can only be carried out if the leak rate is qualified;

[0054] Step 3: Insert the sampling head into the target sampling place of the flue, ...

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Abstract

The invention discloses a multi-pass gas-liquid phase absorption type trace element collection system and a collection method. In the prior art, the liquid-gas contact reaction time in an impact bottle is short, trace elements are easy to escape, negative deviation is brought to a test result, and the accuracy of the test result is influenced. The system comprises a sampling head (1), one end of a pitot tube (2) is fixed on the sampling head, a differential pressure gauge (4) is mounted at the other end of the pitot tube, the sampling head is connected with an accelerating tube (5) through a connecting pipeline, a heat tracing layer (3) wraps outside the connecting pipeline, the accelerating tube adheres to the wall and extends into a fly ash separator (6) along a tangent line, a separation cylinder (8) is arranged on the fly ash separator, a filter membrane (7) is arranged at the bottom of the separation cylinder, the upper part of the bottom of the separation cylinder is connected with an impact pipe (9) through a connecting pipe, and the impact pipe is arranged in a mixing reactor (17). The invention is used for the multi-pass gas-liquid phase absorption type trace element collection system.

Description

technical field [0001] The invention relates to the technical field of monitoring and analyzing trace elements in flue gas, in particular to a multi-pass gas-liquid phase absorption type trace element collection system and collection method. Background technique [0002] During the coal combustion process, air pollutants such as sulfur oxides SOx, nitrogen oxides NOx, dust, and trace elements will be produced, causing serious environmental pollution problems. A large number of literature reports: traces in the form of submicron particles in flue gas pollutants Trace element emissions are more threatening. Trace elements such as mercury, arsenic, chromium and lead may cause organ and tissue lesions after enrichment in the body, causing great harm to human health and the ecological environment; [0003] Mercury (Hg) has a destructive effect on the human nervous system. Long-term exposure to mercury-containing environments is prone to symptoms such as mental muscle motor skill ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/14G01N1/22G01N21/66G01N27/62
CPCG01N1/14G01N1/2202G01N27/62G01N21/66
Inventor 韩立鹏钟犁屈志强余长开吴迅王磊李昱喆
Owner 北京华能长江环保科技研究院有限公司
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