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Method and apparatus for producing mercury vapor with standard concentration

A standard concentration and mercury gas technology, which is applied in the direction of measuring devices, test sample preparation, instruments, etc., to achieve the effect of simplifying the structure of the mercury vapor generator and the waste gas treatment system used for the calibration of environmental monitoring instruments

Inactive Publication Date: 2011-11-23
UNIV OF SHANGHAI FOR SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to overcome the shortcomings of the existing mercury generation, and provide a method that does not need to add liquid mercury to generate standard concentration mercury gas when the measuring instrument is calibrated and its devices to reduce and eliminate pollution caused by mercury vapor emissions

Method used

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  • Method and apparatus for producing mercury vapor with standard concentration
  • Method and apparatus for producing mercury vapor with standard concentration
  • Method and apparatus for producing mercury vapor with standard concentration

Examples

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Effect test

Embodiment 1

[0032] The refrigeration and heating device used in the mercury gas generator for calibration is a device heated by electric current, such as figure 2 As shown, the device is a resistance wire heating layer 10 wrapped outside the sample cell, changing the heating current, changing the temperature of the sample cell, thereby changing the saturated vapor pressure of mercury in the sample cell, and then changing the mercury gas concentration, the resistance wire The heating layer is provided with an insulation layer 11 outside, such as image 3 Shown, in order to maintain the stability of the sample cell temperature.

Embodiment 2

[0034] Depend on Figure 4 As shown, since the sample cell cannot be completely sealed, the vacuum of the sample cell will drop after long-term use, causing the measured pressure in the sample cell to be not equal to the saturation pressure of mercury vapor. Increased suction pipe 12 on the top, valve 13 is housed on the suction pipe, connects vacuum pump 14 behind. After the vacuum drops, you can open the valve, start the vacuum pump to evacuate the sample pool, then close the valve, stop the vacuum pump, and keep the vacuum in the sample pool.

Embodiment 3

[0036] When calibrating very low concentrations, because the liquefaction pressure of mercury is very low, the mercury gas concentration corresponding to the corresponding mercury saturation pressure at room temperature may be too high. figure 1 The cooling and heating device used in the mercury gas generator for intermediate calibration is a semiconductor refrigeration device. By changing the polarity of the power supply of the semiconductor refrigeration device, the polarity of the sample cell can be cooled or heated.

[0037] Attached table: Mercury gas saturation pressure and temperature comparison table

[0038] Saturation vapor pressure of mercury at different temperatures

[0039] temperature / ℃ Vapor pressure / mmHg temperature / ℃ Vapor pressure / mmHg temperature / ℃ Vapor pressure / mmHg -38.0 1.45×10 -6 122.0 0.8198 282.0 164.39 -36.0 1.97×10 -6 124.0 0.9004 284.0 172.21 -34....

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Abstract

The invention discloses a method and an apparatus for producing mercury vapor with a standard concentration. The method comprises steps that a sample cell is vacuumized, added with liquid mercury or amalgam, and sealed; the sample cell is heated or cooled; a mercury vapor pressure in the sample cell is changed with the temperature, and pressure and temperature of the mercury vapor are detected by a pressure gauge; a mercury saturated vapor pressure is obtained from a mercury vapor saturated pressure and temperature parallel table according to the detected pressure and temperature; then a mercury saturated vapor concentration is obtained by calculating according to a formula; and mercury vapor with a standard concentration is obtained. A mercury vapor generator for calibration comprises a pressure gauge, a thermometer, a sample cell, refrigeration and heating equipment, liquid mercury or amalgam, and transparent quartz window. The invention has beneficial effects that the mercury vapor concentration is controlled by adjusting temperature, and the liquid mercury and the amalgam are all sealed in the sample cell, so as to avoid discharge to generate environment pollution, and simplify a structure of a current mercury vapor generator for environment monitoring calibration and an exhaust-gas treatment system.

Description

technical field [0001] The invention relates to a method and a device for generating standard concentration mercury gas. Background technique [0002] Coal-fired power plants and other massive coal-fired emissions of heavy metals - mercury. Mercury is very harmful to the environment and human body. In order to monitor the concentration of mercury emitted in coal combustion flue gas, there are many measurement methods and standards. Many measuring instruments have been developed on this basis. These instruments need to be calibrated and calibrated in use. Mercury generators are often used to generate standard concentrations of mercury gas when calibrating and calibrating mercury gas concentration measuring instruments. The principle of the commonly used mercury generator is to heat liquid mercury to generate mercury vapor, and then dilute it with precisely controlled flow of zero gas and carry the mercury vapor to the calibration sample cell for instrument calibration and ...

Claims

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Application Information

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IPC IPC(8): G01N33/00G01N1/44G01N1/42
Inventor 蔡小舒施娟苏明旭
Owner UNIV OF SHANGHAI FOR SCI & TECH
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