Mercury standard gas generator based on saturated vapor pressure method
A generator and standard gas technology, which is applied in gas generating devices, chemical instruments and methods, gas and gas/vapor mixing, etc., can solve the problems of complex process flow, secondary pollution of waste, inaccurate concentration of mercury standard gas, etc. , to achieve the effect of high precision and easy operation
Active Publication Date: 2014-04-16
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology
The process of this method is complicated, and the generated waste is easy to cause secondary pollution, and the concentration of the solution will change during the preparation and storage process, making the concentration of the generated mercury standard gas inaccurate
In addition, there is a dynamic gas distribution method based on mercury permeation tubes to generate mercury calibration gas. Due to the change of the permeability accuracy of mercury permeation tubes, the precision of mercury calibration gas generated by this method is uncontrollable.
Method used
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[0023] The present invention will be further described in detail below in conjunction with the drawings.
[0024] Such as figure 1 As shown, a mercury standard gas generator based on the saturated vapor pressure method includes a carrier gas pipeline 1 and a dilution gas pipeline 2. Both the carrier gas pipeline 1 and the dilution gas pipeline 2 are continuously fed with high-purity nitrogen gas. A high-purity nitrogen bottle 19 is provided, and a pressure reducing valve 20 is provided after the nitrogen bottle 19. The carrier gas pipeline 1 is connected with a carrier gas mass flow controller 3, a mercury source, a constant temperature condensing device and a gas mixing chamber 12 in sequence. The mercury vapor generated by the mercury source enters the constant temperature condensation device along the carrier gas pipeline 1 and condenses into a mercury saturated vapor at a certain temperature. The mercury saturated vapor enters the mixing chamber 12, and the nitrogen in the d...
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The invention discloses a mercury standard gas generator based on a saturated vapor pressure method. The mercury standard gas generator comprises a mercury source, a constant-temperature condensing device and a gas mixing chamber which are communicated in sequence through a gas carrying pipeline, wherein the constant-temperature condensing device comprises a water groove controlled by a constant-temperature controller, a plurality of gas-washing bottles connected in series, and a gas temperature sensor; mercury vapor produced by the mercury source enters the gas-washing bottles along the gas carrying pipeline and is condensed to form mercury saturated vapor with a certain temperature, and the mercury saturated vapor enters the gas mixing chamber to be mixed with diluent gas in a certain ratio to form mercury standard gas. The mercury standard gas generator can be used for rapidly providing the mercury standard gas for a mercury analyzer, and has the characteristic of being simple to operate and the mercury standard gas concentration is accurate.
Description
Technical field [0001] The invention relates to the calibration field of analytical instruments, in particular to an elemental mercury standard gas generator used for a gaseous mercury analyzer. Background technique [0002] For a long time, the proportion of coal in the energy production and consumption structure has been maintained at about 70%. Taking my country as an example, coal used for power generation accounts for more than 50% of total coal consumption, and coal power generation accounts for 95% of thermal power generation. %. If no control measures are taken, the mercury emitted into the atmosphere by coal-fired power plants will be as high as 310-450 tons, which will inevitably bring severe challenges to the pollution control of thermal power plants. [0003] In order to strengthen the prevention and control of mercury pollution, various mercury pollution sources need to be accurately monitored. The analysis technology of mercury is very mature and can be roughly divid...
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IPC IPC(8): B01J7/00B01F3/02B01F23/10
Inventor 郑海明解东水李广杰
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)