CN111735916B - A system for generating elemental mercury and divalent mercury standard gas and a working method thereof - Google Patents
A system for generating elemental mercury and divalent mercury standard gas and a working method thereof Download PDFInfo
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- CN111735916B CN111735916B CN202010706161.8A CN202010706161A CN111735916B CN 111735916 B CN111735916 B CN 111735916B CN 202010706161 A CN202010706161 A CN 202010706161A CN 111735916 B CN111735916 B CN 111735916B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
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- G01N33/0072—Arrangements to check the analyser by generating a test gas
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Abstract
本发明公开的一种元素汞和二价汞标准气生成系统及其工作方法，属于气态汞监测分析技术领域。虹吸式三通接头的第一入口与梯度蒸发室的低温端连接，梯度蒸发室的高温端通过载气管路与三通连接，三通还分别与第二入口和预热器连接；预热器与流量阀连接，流量阀与过滤器连接，过滤器与氮气储气装置连接；出口连接有两条支路，还原反应器和元素汞标气控制阀设在一条支路上，二价汞标气控制阀设在另一条支路上；加热模块设在梯度蒸发室外部，梯度蒸发室与进液装置连接，进液装置与截止阀连接，截止阀与泵连接，泵与氯化汞标液储液装置连接。结构设计合理，实现不同价态汞标准气浓度的稳定输出，保证汞及其化合物检测设备校核以及相关科学试验的准确性。
The present invention discloses an elemental mercury and divalent mercury standard gas generation system and a working method thereof, belonging to the technical field of gaseous mercury monitoring and analysis. The first inlet of the siphon type three-way joint is connected to the low temperature end of the gradient evaporation chamber, and the high temperature end of the gradient evaporation chamber is connected to the three-way joint through the carrier gas pipeline, and the three-way joint is also connected to the second inlet and the preheater respectively; the preheater is connected to the flow valve, the flow valve is connected to the filter, and the filter is connected to the nitrogen gas storage device; the outlet is connected to two branches, the reduction reactor and the elemental mercury standard gas control valve are arranged on one branch, and the divalent mercury standard gas control valve is arranged on the other branch; the heating module is arranged outside the gradient evaporation chamber, the gradient evaporation chamber is connected to the liquid inlet device, the liquid inlet device is connected to the stop valve, the stop valve is connected to the pump, and the pump is connected to the mercuric chloride standard liquid storage device. The structural design is reasonable, and the stable output of the concentration of mercury standard gas of different valence states is realized, and the accuracy of the calibration of mercury and its compound detection equipment and related scientific experiments is guaranteed.
Description
Technical Field
The invention belongs to the technical field of gaseous mercury monitoring and analysis, and particularly relates to an elemental mercury and bivalent mercury standard gas generation system and a working method thereof.
Background
Mercury is a toxic heavy metal element, and the elemental state of the mercury can be transferred and converted in the global scope, and the mercury stays in the atmosphere for 0.5-2 years, so that serious pollution is caused to ecological environments such as water, atmosphere, soil and the like. In order to reduce mercury pollution and protect human health, a great deal of research work has been carried out on the discharge, migration, conversion, sedimentation and control of mercury and its compounds.
In laboratory studies of mercury and its compounds, elemental mercury standard gas is typically produced using mercury permeation tubes. Although constant temperature water bath heating is adopted to ensure the stability of elemental mercury release, 50% fluctuation of mercury mass concentration still exists. And the mercury permeation tube is expensive, and the risk of leakage of highly toxic substances exists. At present, no permeation tube capable of generating bivalent mercury standard gas exists at home and abroad. Some documents and patents propose methods for generating only bivalent mercury vapor by evaporating a mercuric chloride solution, but related devices have problems of deposition of vaporized bivalent mercury, resulting in great fluctuation of the concentration of the generated bivalent mercury vapor, and only one kind of bivalent mercury gas can be generated by evaporating the mercuric chloride solution.
Disclosure of Invention
In order to solve the problems, the invention aims to provide the elemental mercury and bivalent mercury standard gas generation system and the working method thereof, which have reasonable structural design and simple and convenient operation, can realize stable output of the concentration of mercury standard gas in different valence states, have simple equipment, complete functions, safety and reliability and have good application prospect.
The invention is realized by the following technical scheme:
The invention discloses an elemental mercury and bivalent mercury standard gas generation system, which comprises a nitrogen gas storage device, a filter, a flow valve, a preheater, a tee joint, a siphon tee joint, a gradient evaporation chamber, a heating module, a liquid inlet device, a mercury chloride standard liquid storage device, a pump, a stop valve, a reduction reactor, an elemental mercury standard gas control valve and a bivalent mercury standard gas control valve;
The siphon type three-way joint comprises a first inlet, a second inlet and an outlet, wherein the first inlet is connected with the low-temperature end of the gradient evaporation chamber, the high-temperature end of the gradient evaporation chamber is connected with a three-way through a carrier gas pipeline, the three-way is also connected with the second inlet and the preheater respectively;
The heating module is arranged outside the gradient evaporation chamber, the liquid inlet device is arranged at the upper part of the low-temperature end of the gradient evaporation chamber and is communicated with the interior of the gradient evaporation chamber, the liquid inlet device is connected with the stop valve, the stop valve is connected with the pump, and the pump is connected with the mercury chloride standard liquid storage device.
Preferably, a venturi structure is arranged between the second inlet and the outlet of the siphon type three-way joint.
Preferably, the filter is internally filled with modified activated carbon.
Preferably, the siphon tee is a polytetrafluoroethylene joint.
Preferably, the gradient vaporization chamber inner cavity is arc-shaped.
Preferably, the heating module comprises a plurality of groups of ceramic heating plates, and each group of ceramic heating plates is respectively connected with a temperature control device.
Preferably, the liquid inlet means is a syringe pump.
Preferably, the pump is a peristaltic pump.
Preferably, the top of the reduction reactor is arched.
The working method of the elemental mercury and bivalent mercury standard gas generation system disclosed by the invention comprises the following steps:
The method comprises the steps of adding mercury chloride standard liquid into a mercury chloride standard liquid storage device, adding stannous chloride solution into a reduction reactor, setting the temperature of a heating module to enable a temperature gradient to exist between a high-temperature end and a low-temperature end of a gradient evaporation chamber, setting the opening of a flow valve and the temperature of a preheater, and opening a nitrogen storage device to purge the whole system;
The method comprises the steps of opening a stop valve, starting a pump, setting the opening, enabling mercury chloride standard liquid to enter a gradient evaporation chamber from a liquid inlet device, and vaporizing to generate bivalent mercury vapor;
The other path of nitrogen enters the siphon type three-way joint from the second inlet, and negative pressure is formed at the first inlet, so that pressure difference gradient is generated in the gradient evaporation chamber;
and closing a bivalent mercury standard gas control valve, opening an elemental mercury standard gas control valve, and outputting the bivalent mercury standard gas after entering a reduction reactor to generate the elemental mercury standard gas.
Compared with the prior art, the invention has the following beneficial technical effects:
According to the elemental mercury and bivalent mercury standard gas generation system disclosed by the invention, the mercuric chloride standard liquid generates bivalent mercury vapor in the gradient evaporation chamber, the bivalent mercury vapor enters the siphon type three-way joint under the action of the temperature gradient in the gradient evaporation chamber, the temperature gradient in the gradient evaporation chamber can prevent the bivalent mercury vapor from accumulating and flowing back, the bivalent mercury vapor enters the siphon type three-way joint and is output under the action of the pressure difference gradient, and the pressure difference gradient can also prevent the bivalent mercury vapor from accumulating and flowing back, and continuous and stable output is realized. The nitrogen is purified by a filter to prevent the concentration of the bivalent mercury vapor from being influenced by the magazine gas, the nitrogen enters the gradient evaporation chamber after being preheated by the preheater, the temperature gradient in the gradient evaporation chamber can be prevented from being damaged by the excessively low temperature, the continuous and stable output of the bivalent mercury vapor is influenced, and the liquid inlet device is positioned at the output side of the sample gas to ensure the release rate of the gasified mercury standard gas. The system has reasonable structural design and complete functions, can switch functions according to actual needs, is safe and reliable, and ensures the accuracy of mercury and mercury compound detection equipment check and related scientific tests.
Further, a venturi tube structure is adopted between the second inlet and the second outlet of the siphon type three-way joint, the generated pressure difference gradient effect is good, the structure is simple, and the installation and the maintenance are convenient.
Further, the filter is internally filled with modified activated carbon, so that the nitrogen purification effect is good and the cost is low.
Furthermore, the siphon type three-way joint adopts a polytetrafluoroethylene joint, so that the attachment of mercury standard gas is prevented, and the accuracy of the mercury standard gas is influenced.
Further, the inner cavity of the gradient evaporation chamber is arc-shaped, so that the flow of the bivalent mercury vapor in the gradient evaporation chamber can be smooth, and the bivalent mercury vapor is prevented from being deposited at dead angles.
Furthermore, the heating module comprises a plurality of groups of ceramic heating plates, the heating effect is good, the service life is long, and each group of ceramic heating plates is respectively connected with a temperature control device, so that the temperature gradient in the heating module can be controlled independently.
Furthermore, the liquid inlet device adopts the injection pump, so that high-precision, stable and pulse-free transmission can be realized, and the generation speed of the system can be controlled conveniently.
Furthermore, the peristaltic pump is adopted, so that the peristaltic pump has the advantages of good sealing performance, safety, no pollution, good stability, high precision and simplicity in installation and maintenance.
Further, the top of the reduction reactor is arched, so that the stability and the continuity of mercury standard gas output are ensured.
The working method of the elemental mercury and bivalent mercury standard gas generation system disclosed by the invention is simple and convenient to operate, safe and reliable, low in operation and maintenance cost and good in application prospect.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the present invention;
fig. 2 is a schematic structural view of a siphon type three-way joint.
In the figure, 1 is a nitrogen gas storage device, 2 is a filter, 3 is a flow valve, 4 is a preheater, 5 is a tee joint, 6 is a siphon tee joint, 6-1 is a first inlet, 6-2 is a second inlet, 6-3 is an outlet, 7 is a carrier gas pipeline, 8 is a gradient evaporation chamber, 9 is a heating module, 10 is a liquid inlet device, 11 is a mercury chloride standard liquid storage device, 12 is a pump, 13 is a stop valve, 14 is a reduction reactor, 15 is an elemental mercury standard gas control valve, and 16 is a bivalent mercury standard gas control valve.
Detailed Description
The invention will now be described in further detail with reference to the accompanying drawings, the content of which is to be interpreted as illustrative and not limiting:
Referring to fig. 1, the system for generating standard gas of elemental mercury and bivalent mercury comprises a nitrogen storage device 1, a filter 2, a flow valve 3, a preheater 4, a tee joint 5, a siphon tee joint 6, a gradient evaporation chamber 8, a heating module 9, a liquid inlet device 10, a mercury chloride standard liquid storage device 11, a pump 12, a stop valve 13, a reduction reactor 14, an elemental mercury standard gas control valve 15 and a bivalent mercury standard gas control valve 16.
As shown in fig. 2, the siphon type three-way joint 6 is made of polytetrafluoroethylene, the siphon type three-way joint 6 comprises a first inlet 6-1, a second inlet 6-2 and an outlet 6-3, and preferably, a venturi tube structure is arranged between the second inlet 6-2 and the outlet 6-3 of the siphon type three-way joint 6.
The gradient evaporation chamber 8 adopts a cylindrical structure, two ends are spherical sealing heads, and an inner cavity is an arc without dead angle. The first inlet 6-1 is connected with the low temperature end of the gradient evaporation chamber 8, the high temperature end of the gradient evaporation chamber 8 is connected with the tee joint 5 through the carrier gas pipeline 7, the tee joint 5 is also connected with the second inlet 6-2 and the preheater 4 respectively, the preheater 4 is connected with the flow valve 3, the flow valve 3 is connected with the filter 2, the filter 2 is filled with modified activated carbon, the filter 2 is connected with the nitrogen storage device 1, the outlet 6-3 is connected with two branches, the reduction reactor 14 and the elemental mercury standard gas control valve 15 are arranged on one branch, and the bivalent mercury standard gas control valve 16 is arranged on the other branch. Preferably, the top of the reduction reactor 14 is of arcuate design.
The heating module 9 is arranged outside the gradient evaporation chamber 8, preferably, the heating module 9 comprises a plurality of groups of ceramic heating plates, and each group of ceramic heating plates is respectively connected with a temperature control device, so that temperature control can be independently performed. The gradient evaporation chamber 8 is connected with the liquid inlet device 10, the liquid inlet device 10 is preferably an injection pump, the liquid inlet device 10 is connected with a stop valve 13, the stop valve 13 is connected with a pump 12, the pump 12 is preferably a peristaltic pump, and the pump 12 is connected with a mercury chloride standard liquid storage device 11.
The working method of the elemental mercury and bivalent mercury standard gas generation system comprises the following steps:
adding mercury chloride standard liquid into a mercury chloride standard liquid storage device 11, adding stannous chloride solution into a reduction reactor 14, setting the temperature of a heating module 9 to enable a temperature gradient to exist between a high-temperature end and a low-temperature end of a gradient evaporation chamber 8, setting the opening of a flow valve 3 and the temperature of a preheater 4, and opening a nitrogen storage device 1 to purge the whole system;
the method comprises the steps of opening a stop valve 13, starting a pump 12, setting the opening, enabling a mercury chloride standard solution to enter a gradient evaporation chamber 8 from a liquid inlet device 10, and gasifying to generate bivalent mercury vapor, purifying nitrogen in a nitrogen storage device 1 through a filter 2, enabling the purified nitrogen to enter a preheater 4 through a flow valve 3, preheating the purified nitrogen, enabling the purified nitrogen to enter the gradient evaporation chamber 8 from a high-temperature end of the gradient evaporation chamber 8, and enabling the purified nitrogen to enter the gradient evaporation chamber 8 to rise temperature again, so that a temperature gradient is generated in the gradient evaporation chamber 8, and enabling the bivalent mercury vapor to enter a siphon three-way joint 6 through a first inlet 6-1;
The other path of nitrogen enters the siphon three-way joint 6 from the second inlet 6-2, negative pressure is formed at the first inlet 6-1, so that pressure difference gradient is generated in the gradient evaporation chamber 8, and the bivalent mercury vapor generated in the gradient evaporation chamber 8 outputs bivalent mercury standard gas through the outlet 6-3 under the action of the temperature gradient and the pressure difference gradient;
And closing the bivalent mercury standard gas control valve 16, opening the elemental mercury standard gas control valve 15, and outputting the bivalent mercury standard gas after entering the reduction reactor 14 to generate the elemental mercury standard gas.
The invention is further illustrated by the following examples:
Example 1
Step 1, adding deionized water diluted mercury chloride standard solution into a mercury chloride standard solution storage device 11, wherein the concentration M1 of the mercury chloride standard solution is in a closing state of a stop valve 13, and the closing state of an elemental mercury control valve 15;
setting the temperature of the left side (the carrier gas pipeline 7 side) of the heating module 9 to be 180 ℃ and the temperature of the right side of the heating module 9 to be 160 ℃;
Step 3, opening a bivalent mercury standard gas control valve 16, setting a flow valve 3 flow value V1, setting the temperature of the preheater 4 to 160 ℃, opening a nitrogen storage device 1, and purging a system for 120 seconds;
Step 4, starting a pump 12, setting flow Q1, enabling mercury chloride standard liquid to enter a gradient evaporation chamber 8 from a liquid inlet device 10, and evaporating to generate bivalent mercury vapor;
Step 5, nitrogen in the carrier gas pipeline 7 enters the gradient evaporation chamber 8 to heat up again, so that a temperature gradient is generated in the gradient evaporation chamber 8, bivalent mercury vapor is prevented from being deposited and reflowed, and the bivalent mercury vapor enters the siphon type three-way joint 6 through the first inlet 6-1;
Step 6, another path of nitrogen enters the siphon type three-way joint 6 from the second inlet 6-2, and as the channel in the siphon type three-way joint 6 becomes smaller, the flow speed of the nitrogen is increased, negative pressure is formed at the steam inlet, and the siphon effect causes the gradient evaporation chamber 8 to generate pressure difference gradient;
And 7, outputting the bivalent mercury standard gas with stable concentration from the outlet 6-3 under the action of the temperature gradient and the pressure difference gradient of mercury vapor generated by the gradient evaporation chamber 8. The concentration of the mercury standard gas is M1 x Q1/V1. The flow rates of the pump 12 and the flow valve 3 may be set in advance according to the required standard gas concentration of the bivalent mercury.
Example 2
Step 1, adding deionized water diluted mercury chloride standard solution to a mercury chloride standard solution storage device 11, adding a reducing agent 10% stannous chloride solution to a reduction reactor 14, closing a stop valve 13, and closing a bivalent mercury standard gas control valve 16;
setting the temperature of the left side (the carrier gas pipeline 7 side) of the heating module 9 to be 180 ℃ and the temperature of the right side of the heating module 9 to be 160 ℃;
step 3, opening an elemental mercury control valve 15, setting a flow valve 3 flow value V2, setting the temperature of the preheater 4 to 160 ℃, opening the nitrogen storage device 1, and purging the system for 120 seconds;
step 4, starting a pump 12, setting flow Q2, enabling mercury chloride standard liquid to enter a gradient evaporation chamber 8 from a liquid inlet device 10, and evaporating to generate bivalent mercury vapor;
step 5, nitrogen in the carrier gas pipeline 7 enters the gradient evaporation chamber 8 to heat up again, so that a temperature gradient is generated in the gradient evaporation chamber 8, bivalent mercury vapor is prevented from being deposited and reflowed, and the bivalent mercury vapor enters the siphon-type three-way joint 6 through the gradient evaporation chamber 8;
Step 6, another path of nitrogen enters the siphon type three-way joint 6 from the second inlet 6-2, and as the channel in the siphon type three-way joint 6 becomes smaller, the flow speed of the nitrogen is increased, negative pressure is formed at the steam inlet, and the siphon effect causes the gradient evaporation chamber 8 to generate pressure difference gradient;
And 7, outputting bivalent mercury standard gas with stable concentration from an outlet 6-3 under the action of temperature gradient and pressure gradient of mercury vapor generated by the gradient evaporation chamber 8, enabling the bivalent mercury standard gas to enter a reduction reactor 14, and then enabling the bivalent mercury standard gas to undergo oxidation-reduction reaction with stannous chloride solution to generate elemental mercury, wherein Hg 2++Sn2+＝Hg↑+Sn4+ is output from the top of the reduction reactor 14. The concentration of the mercury standard gas is M2 x Q2/V2. The pump 12 and the flow valve 3 may be preset according to the desired elemental mercury standard gas concentration.
The foregoing is only a part of the embodiments of the present invention, and although some terms are used in the present invention, the use of other terms is not excluded. These terms are used merely for convenience of description and to explain the nature of the invention and are to be construed as any additional limitations that are not intended to depart from the spirit of the invention. The foregoing description of the invention is provided by way of example only to facilitate easy understanding, but is not intended to limit the scope of the invention to any particular embodiment or embodiment, and is to be construed as being limited thereto.
Claims (8)
1. A standard gas generation system for elemental mercury and bivalent mercury is characterized in that,
The device comprises a nitrogen storage device (1), a filter (2), a flow valve (3), a preheater (4), a tee joint (5), a siphon tee joint (6), a gradient evaporation chamber (8), a heating module (9), a liquid inlet device (10), a mercury chloride standard liquid storage device (11), a pump (12), a stop valve (13), a reduction reactor (14), an elemental mercury standard gas control valve (15) and a bivalent mercury standard gas control valve (16);
The siphon type three-way joint (6) comprises a first inlet (6-1), a second inlet (6-2) and an outlet (6-3), a venturi tube structure is arranged between the second inlet (6-2) and the outlet (6-3) of the siphon type three-way joint (6), the first inlet (6-1) is connected with the low-temperature end of the gradient evaporation chamber (8), the high-temperature end of the gradient evaporation chamber (8) is connected with the three-way joint (5) through a carrier gas pipeline (7), the three-way joint (5) is also connected with the second inlet (6-2) and the preheater (4) respectively, the preheater (4) is connected with a flow valve (3), the flow valve (3) is connected with a filter (2), modified activated carbon is filled in the filter (2) and is connected with a nitrogen gas storage device (1), the outlet (6-3) is connected with two branches, a reduction reactor (14) and an elemental mercury standard gas control valve (15) are arranged on one branch, and a bivalent mercury standard gas control valve (16) is arranged on the other branch;
the heating module (9) is arranged outside the gradient evaporation chamber (8), the liquid inlet device (10) is arranged at the upper part of the low-temperature end of the gradient evaporation chamber (8) and is communicated with the inside of the gradient evaporation chamber (8), the liquid inlet device (10) is connected with the stop valve (13), the stop valve (13) is connected with the pump (12), and the pump (12) is connected with the mercury chloride standard liquid storage device (11).
2. The elemental mercury and divalent mercury standard gas generation system as recited in claim 1, characterized in that the siphon tee (6) is a polytetrafluoroethylene joint.
3. The elemental mercury and divalent mercury standard gas generation system as recited in claim 1, characterized in that the gradient vaporization chamber (8) has an interior cavity that is arcuate.
4. The elemental mercury and divalent mercury standard gas generation system as recited in claim 1, characterized in that the heating module (9) comprises several groups of ceramic heating plates, each group of ceramic heating plates being connected with a temperature control device, respectively.
5. The elemental mercury and divalent mercury standard gas generation system as recited in claim 1, characterized in that the liquid intake device (10) is a syringe pump.
6. The elemental mercury and divalent mercury standard gas generation system as recited in claim 1, characterized in that the pump (12) is a peristaltic pump.
7. The elemental mercury and divalent mercury standard gas generation system as recited in claim 1, characterized in that the top of the reduction reactor (14) is arched.
8. The method for operating an elemental mercury and divalent mercury standard gas generation system as recited in any one of claims 1-7, comprising:
Adding mercury chloride standard liquid into a mercury chloride standard liquid storage device (11), and adding stannous chloride solution into a reduction reactor (14);
Setting the temperature of a heating module (9) to enable a temperature gradient to exist between a high-temperature end and a low-temperature end of a gradient evaporation chamber (8), setting the opening of a flow valve (3) and the temperature of a preheater (4), and opening a nitrogen storage device (1) to purge the whole system;
The method comprises the steps of opening a stop valve (13), starting a pump (12) and setting the opening, enabling a mercury chloride standard solution to enter a gradient evaporation chamber (8) from a liquid inlet device (10), and gasifying to generate bivalent mercury vapor, purifying nitrogen in a nitrogen storage device (1) through a filter (2), enabling the purified nitrogen to enter a preheater (4) through a flow valve (3) to be preheated, enabling the nitrogen to enter the gradient evaporation chamber (8) from a high-temperature end of the gradient evaporation chamber (8) to be heated again, enabling the gradient evaporation chamber (8) to generate a temperature gradient, and enabling the bivalent mercury vapor to enter a siphon type three-way joint (6) through a first inlet (6-1);
The other path of nitrogen enters the siphon type three-way joint (6) from the second inlet (6-2), negative pressure is formed at the first inlet (6-1) to enable the gradient evaporation chamber (8) to generate pressure difference gradient, and the bivalent mercury vapor generated by the gradient evaporation chamber (8) outputs bivalent mercury standard gas from the outlet (6-3) under the action of the temperature gradient and the pressure difference gradient;
opening a bivalent mercury standard gas control valve (16), closing an elemental mercury standard gas control valve (15), and outputting a bivalent mercury standard gas;
And closing a bivalent mercury standard gas control valve (16), opening an elemental mercury standard gas control valve (15), and outputting the bivalent mercury standard gas after entering a reduction reactor (14) to generate the elemental mercury standard gas.
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| CN113984950B (en) * | 2021-11-15 | 2025-07-04 | 北京华能长江环保科技研究院有限公司 | Monitoring system and method for elemental mercury and divalent mercury based on chemical absorption |
| CN114935564A (en) * | 2022-05-20 | 2022-08-23 | 贵州师范大学 | A device and method for measuring different valence mercury in soil |
| CN115386960B (en) * | 2022-09-19 | 2023-09-05 | 中国电子科技集团公司第四十八研究所 | A mercury source furnace and method for replenishing mercury liquid |
| CN116008024A (en) * | 2022-12-09 | 2023-04-25 | 华能重庆珞璜发电有限责任公司 | Preparation device and preparation method of zero-valent mercury standard gas |
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| CN212301503U (en) * | 2020-07-21 | 2021-01-05 | 华能国际电力股份有限公司 | An elemental mercury and divalent mercury standard gas generation system |
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| CN212301503U (en) * | 2020-07-21 | 2021-01-05 | 华能国际电力股份有限公司 | An elemental mercury and divalent mercury standard gas generation system |
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