Polymorphic high-precision mercury standard gas generating device

Abstract

The utility model provides a polymorphic high-precision mercury standard gas generating device which can simultaneously generate elemental mercury standard gas and divalent mercury standard gas so as to meet monitoring requirements. Comprising a zero gas filtering unit, a standard gas switching unit, a mercury standard gas generation unit and a standard gas output unit which are sequentially connected, the mercury standard gas generation unit comprises an element mercury standard gas generation unit and a solution gasification unit, and the element mercury standard gas generation unit and the solution gasification unit are both connected to the standard gas output unit; the standard gas switching unit can switch connection and / or disconnection between the elemental mercury standard gas generation unit and the solution gasification unit, and when the elemental mercury standard gas generation unit is connected with the solution gasification unit, corresponding output gases are mixed to generate divalent mercury standard gas.

Description

TECHNICAL FIELD

[0001] The utility model relates to mercury standard gas generation technical field, concretely is a kind of multi-form high-precision mercury standard gas generation device. BACKGROUND

[0002] Coal-fired flue gas mercury emission is the main artificial emission source of mercury pollution, mercury heavy metal pollutants, its atmospheric residence time is long, and it will cause great harm to the environment and human health. China is a coal-based energy country, with the continuous growth of coal consumption, the emission of mercury in coal-fired flue gas will also become an important environmental problem we face. Generally speaking, mercury in coal-fired flue gas mainly exists in three forms, namely elemental mercury, divalent mercury and particulate mercury.

[0003] At present, the monitoring of elemental mercury and divalent mercury in coal-fired flue gas mainly uses mercury online monitoring system. In order to ensure the accuracy of the monitoring system, calibration is usually required during use. However, the existing mercury online monitoring system can only produce elemental mercury standard gas or divalent mercury standard gas, which cannot meet the monitoring requirements. Moreover, divalent mercury standard gas is easily lost during transmission, resulting in low monitoring accuracy of divalent mercury standard gas concentration and poor calibration effect. UTILITY MODEL CONTENT

[0004] In view of the above problems, the utility model provides a kind of multi-form high-precision mercury standard gas generation device, it can simultaneously produce elemental mercury standard gas and divalent mercury standard gas, to meet the monitoring requirements.

[0005] The utility model adopts the following technical scheme, a kind of multi-form high-precision mercury standard gas generation device, including zero gas filtration unit, standard gas switching unit, mercury standard gas generation unit, standard gas output unit connected in turn, the mercury standard gas generation unit includes elemental mercury standard gas generation unit, solution gasification unit, the elemental mercury standard gas generation unit, solution gasification unit are connected to the standard gas output unit;The standard gas switching unit can switch the communication and / or disconnection between the elemental mercury standard gas generation unit and the solution gasification unit, and the corresponding output gas mixture generates divalent mercury standard gas when the elemental mercury standard gas generation unit and the solution gasification unit are communicated.

[0006] Further, the zero gas filtration unit includes mercury filter, the air inlet of the mercury filter is communicated with mercury-free compressed air, and the air outlet of the mercury filter is connected to the standard gas switching unit;

[0007] Further, the standard gas switching unit comprises a first switching pipeline, a second switching pipeline and a third switching pipeline connected in parallel, the gas inlets of the first switching pipeline, the second switching pipeline and the third switching pipeline are connected with the gas outlet of the mercury filter; the solution gasification unit is located on the third switching pipeline, the elemental mercury standard gas generating unit is connected with the first switching pipeline and the second switching pipeline, and the gas outlets of the first switching pipeline and the second switching pipeline are connected with the gas outlet intersection of the third switching pipeline, and the gas outlet intersection is connected with the standard gas output unit;

[0008] Further, the elemental mercury standard gas generating unit comprises a dilution gas mass flow meter, a mercury source mass flow meter, a mercury source gas inlet valve, a constant temperature mercury vapor chamber and a mercury source gas outlet valve, the dilution gas mass flow meter is connected with the first switching pipeline, and the mercury source mass flow meter, the mercury source gas inlet valve, the constant temperature mercury vapor chamber and the mercury source gas outlet valve are sequentially connected with the second switching pipeline; the outlet of the dilution gas mass flow meter and the outlet of the mercury source gas outlet valve are connected with the standard gas output unit.

[0009] Further, the solution gasification unit comprises a gasification dilution mass flow meter, a high-temperature vaporization chamber, a metering pump and an HCl solution bottle, the gasification dilution mass flow meter and the high-temperature vaporization chamber are located on the third switching pipeline, the gasification dilution mass flow meter is connected with the high-temperature vaporization chamber through one of the inlets of a Y-shaped nozzle, the HCl solution bottle is connected with the high-temperature vaporization chamber through the other inlet of the Y-shaped nozzle via the metering pump, the spraying port of the Y-shaped nozzle extends into the high-temperature vaporization chamber, and the gas outlet of the high-temperature vaporization chamber is connected with the standard gas output unit.

[0010] Further, the mercury standard gas generating device further comprises a cleaning unit, the cleaning unit comprises a cleaning tee valve, a waste liquid recovery valve, a pure water bottle and a waste liquid bottle, the cleaning tee valve is connected between the metering pump and the HCl solution bottle, the pure water bottle is connected with the cleaning tee valve, the waste liquid recovery valve is connected between the metering pump and the high-temperature vaporization chamber, and the waste liquid bottle is connected with the waste liquid recovery valve.

[0011] Further, the standard gas output unit comprises a standard gas output pipeline, and the elemental mercury standard gas generating unit and the solution gasification unit are connected with a PLC controller.

[0012] Further, the high-temperature vaporization chamber and the standard gas output unit are located in a high-temperature constant temperature zone.

[0013] The utility model discloses a beneficial effect is, it adopts the mark gas switching mode, generates the element mercury mark gas through the element mercury mark gas generating unit, and the output gas mixing of element mercury mark gas generating unit, solution gasification unit generates divalent mercury mark gas, thereby can produce element mercury mark gas and divalent mercury mark gas, meets the monitoring demand, has better use value. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is the connection schematic diagram of the utility model. DETAILED DESCRIPTION

[0015] As Figure 1 The utility model discloses a kind of multi-form high-precision mercury mark gas generating device, including zero gas filtration unit, mark gas switching unit, mercury mark gas generating unit, mark gas output unit connected in turn, mercury mark gas generating unit includes element mercury mark gas generating unit, solution gasification unit, element mercury mark gas generating unit, solution gasification unit are connected in mark gas output unit;Mark gas switching unit can switch the communication and / or disconnect between element mercury mark gas generating unit and solution gasification unit, and when element mercury mark gas generating unit and solution gasification unit are communicated, corresponding output gas mixing generates divalent mercury mark gas.

[0016] Zero gas filtration unit includes mercury filter 1, the air inlet of mercury filter 1 is communicated with mercury-free compressed air, and the air outlet of mercury filter 1 is connected with mark gas switching unit;Mark gas switching unit includes parallelly connected first switching pipeline 18, second switching pipeline 19, third switching pipeline 20, the air inlet of first switching pipeline 18, second switching pipeline 19, third switching pipeline 20 is connected with the air outlet of mercury filter 1;Solution gasification unit is located on third switching pipeline 20, element mercury mark gas generating unit and first switching pipeline 18, second switching pipeline 19 are connected, and the air outlet of third switching pipeline 20 is connected with the air outlet cross communication point between first switching pipeline 18 and second switching pipeline 19 after being gathered.

[0017] Element mercury mark gas generating unit includes diluent gas mass flowmeter 2, mercury source mass flowmeter 3, mercury source air inlet valve 5, constant-temperature mercury vapor chamber 6, mercury source air outlet valve 7, diluent gas mass flowmeter 2 is connected on first switching pipeline 18, mercury source mass flowmeter 3, mercury source air inlet valve 5, constant-temperature mercury vapor chamber 6, mercury source air outlet valve 7 are sequentially connected on second switching pipeline 19;The outlet of diluent gas mass flowmeter 2 is connected with the outlet of mercury source air outlet valve 7 after being gathered and is connected in mark gas output unit;Element mercury mark gas generating unit when using, mercury source air inlet valve 5 is opened by PLC controller, mercury source air outlet valve 7, and simultaneously, PLC controller can adjust and control the air volume of diluent gas mass flowmeter 2 and mercury source mass flowmeter 3 according to circumstances, to reach the purpose that the element mercury mark gas of mark gas output pipe 8 output can be accurately controlled.

[0018] The solution gasification unit comprises a gasification dilution mass flow meter 4, a high-temperature vaporization chamber 10, a metering pump 12, and an HCL solution bottle 14; the gasification dilution mass flow meter 4 and the high-temperature vaporization chamber 10 are located on the third switching pipeline 20; the gasification dilution mass flow meter 4 is connected to the high-temperature vaporization chamber 10 through one of the inlet ports of the Y-shaped nozzle 17, the HCL solution bottle 14 is connected to the high-temperature vaporization chamber 10 through the other inlet port of the Y-shaped nozzle 17 after being connected to the metering pump 12, the spray port of the Y-shaped nozzle 17 extends into the high-temperature vaporization chamber 10, and the gas outlet of the high-temperature vaporization chamber 10 is connected to the standard gas output unit; when the solution gasification unit is in use, the amount of gas passing through the dilution mass flow meter and the amount of liquid passing through the metering pump 12 are adjusted by the PLC controller according to the situation, so that the concentration of chlorine gas decomposed by the high-temperature reaction in the high-temperature vaporization chamber 10 can reach the quantitative gasification control purpose.

[0019] The mercury standard gas generating device further comprises a cleaning unit, the cleaning unit comprises a cleaning tee valve 11, a waste liquid recovery valve 13, a pure water bottle 15, and a waste liquid bottle 16; the cleaning tee valve 11 is connected between the metering pump 12 and the HCL solution bottle 14; the pure water bottle 15 is connected to the cleaning tee valve 11; the waste liquid recovery valve 13 is connected between the metering pump 12 and the high-temperature vaporization chamber 10; and the waste liquid bottle 16 is connected to the waste liquid recovery valve 13.

[0020] The standard gas output unit comprises a standard gas output pipe 8; in order to ensure that the mercury standard gas generating device does not produce a reversible reaction in the process of gasification and output of divalent mercury standard gas, the high-temperature vaporization chamber 10 and the pipelines along the way thereafter are arranged in the high-temperature constant temperature zone 9, so that the constant temperature heat preservation prevents the reversible reaction of chlorine and mercuric chloride; the elemental mercury standard gas generating unit and the solution gasification unit are connected to the existing PLC controller (not shown in the figure), that is, the dilution gas mass flow meter 2, the mercury source mass flow meter 3, the mercury source gas inlet valve 5, the constant-temperature mercury vapor chamber 6, the mercury source gas outlet valve 7, the gasification dilution mass flow meter 4, the high-temperature vaporization chamber 10, the metering pump 12, the cleaning tee valve 11, the waste liquid recovery valve 13, and other electronic devices / equipment are connected to the PLC controller, and then accurate control can be realized through the PLC controller.

[0021] The working process of the utility model is: the gas inlet of the mercury filter 1 is communicated with the compressed air without mercury,

[0022] The gas inlet of the mercury filter 1 is connected with compressed air, and the compressed air passing through the mercury filter 1 does not contain mercury, which is called zero gas, and can ensure the controllability of the subsequent output of mercury standard gas;

[0023] One way of zero gas through the mercury source mass flow meter 3, the mercury source mass flow meter 3 control small flow zero gas in turn through the mercury source inlet valve 5, constant temperature mercury vapor chamber 6, mercury source outlet valve 7, ensure that the outlet gas of mercury source outlet valve 7 is saturated mercury vapor;Another way of zero gas through the dilution gas mass flow meter 2 and the outlet saturated mercury vapor of mercury source outlet valve 7, then the standard gas output pipe 8 outputs the standard gas as elemental mercury standard gas;Through the corresponding control of PLC controller dilution gas mass flow meter 2, mercury source mass flow meter 3 zero gas flow and constant temperature mercury vapor chamber 6 temperature, the concentration and volume of elemental mercury standard gas output pipe 8 can be accurately controlled;

[0024] The solution in the HCL solution bottle 14 is mixed with zero gas through the gasification dilution mass flow meter 4 in the Y type nozzle 17 after passing through the cleaning three-way valve 11, the metering pump 12 and the waste liquid recovery valve 13, and is sprayed in the atomized state in the high temperature vaporization chamber 10 through the Y type nozzle 17, at this time, chlorine gas is generated by high temperature vaporization and chemical decomposition reaction in the high temperature vaporization chamber 10, so that the solution gasification process is completed;The chlorine gas content after gasification can be accurately controlled by corresponding control of the volume of zero gas of the gasification dilution mass flow meter 4 and the volume of solution passing through the metering pump 12 through the PLC controller;

[0025] And according to the above elemental mercury standard gas and solution gasification quantitative control operation, the chemical reaction of mixing elemental mercury standard gas and chlorine gas after gasification can produce mercury chloride gas with controllable concentration, that is, the accurate quantitative control output of divalent mercury standard gas can be achieved.

[0026] In addition, in order to ensure the controllability and accuracy of the solution gasification process of the mercury standard gas generating device, the mercury standard gas generating device needs to be cleaned before and after the solution gasification process, including the metering pump 12, the Y type nozzle 17, the high temperature vaporization chamber 10 and the pipeline along the way, so as to ensure that the residual solution in the above devices and pipeline wall does not cause metering error for this or subsequent solution gasification process.

[0027] When the metering pump 12 is cleaned, the pure water in the pure water bottle 15 is collected into the waste liquid bottle 16 after passing through the cleaning three-way valve 11, the metering pump 12 and the waste liquid recovery valve 13.

[0028] When the subsequent pipeline is cleaned, the pure water in the pure water bottle 15 is discharged by the standard gas output pipe 8 after passing through the cleaning three-way valve 11, the metering pump 12, the waste liquid recovery valve 13, the Y type nozzle 17 and the high temperature vaporization chamber 10.

[0029] In summary, the mercury standard gas generating device can realize accurate measurement, can simultaneously generate elemental mercury standard gas and divalent mercury standard gas, and can generate elemental mercury standard gas and divalent mercury standard gas with different concentrations by controlling the volume of zero gas or solution.

[0030] It is apparent for a person skilled in the art that the present application is not limited to the details of the above-described exemplary embodiments, but that it can be implemented in other concrete forms without departing from the spirit or the essential characteristics of the present application. Therefore, the embodiments should be considered as exemplary and non-limiting, the scope of the present application being defined by the claims appended hereto rather than by the above description, and all the changes which fall within the meaning and the scope of the equivalent elements of the claims are intended to be embraced therein. Any reference signs in the claims should not be construed as limiting the claims to the figures in which the reference signs are used.

[0031] Furthermore, it should be understood that although the present specification describes exemplary embodiments, not every embodiment contains only one independent technical solution, and the present specification is described in this way only for the sake of clarity, and a person skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that a person skilled in the art can understand.

Claims

1. A multi-form high-precision mercury standard gas generating device, characterized in that: The mercury standard gas generating device comprises a zero gas filtering unit, a standard gas switching unit, a mercury standard gas generating unit and a standard gas output unit connected in sequence, wherein the mercury standard gas generating unit comprises an elemental mercury standard gas generating unit and a solution gasification unit, and the elemental mercury standard gas generating unit and the solution gasification unit are connected to the standard gas output unit. The standard gas switching unit can switch the communication and / or disconnection between the elemental mercury standard gas generating unit and the solution gasification unit, and generate divalent mercury standard gas by mixing corresponding output gas when the elemental mercury standard gas generating unit and the solution gasification unit are in communication.

2. A multi-form high-precision mercury standard gas generating device according to claim 1, characterized in that: The zero gas filtering unit comprises a mercury filter, the air inlet of the mercury filter is communicated with compressed air without mercury, and the air outlet of the mercury filter is connected to the standard gas switching unit.

3. A multi-form high-precision mercury standard gas generating device according to claim 2, characterized in that: The standard gas switching unit comprises a first switching pipeline, a second switching pipeline and a third switching pipeline connected in parallel, the air inlets of the first switching pipeline, the second switching pipeline and the third switching pipeline are connected to the air outlet of the mercury filter, the solution gasification unit is located on the third switching pipeline, the elemental mercury standard gas generating unit is connected to the first switching pipeline and the second switching pipeline, and the air outlets of the third switching pipeline are connected to the air outlet cross communication points between the first switching pipeline and the second switching pipeline, and then connected to the standard gas output unit.

4. The multi-form high-precision mercury standard gas generation device according to claim 3, characterized in that: The elemental mercury standard gas generating unit comprises a dilution gas mass flow meter, a mercury source mass flow meter, a mercury source air inlet valve, a constant temperature mercury vapor chamber and a mercury source air outlet valve, the dilution gas mass flow meter is connected to the first switching pipeline, and the mercury source mass flow meter, the mercury source air inlet valve, the constant temperature mercury vapor chamber and the mercury source air outlet valve are connected to the second switching pipeline in sequence; the outlet of the dilution gas mass flow meter and the outlet of the mercury source air outlet valve are connected to the standard gas output unit.

5. The multi-form high-precision mercury standard gas generating device according to claim 3, characterized in that: The solution gasification unit comprises a gasification dilution mass flow meter, a high temperature vaporization chamber, a metering pump and an HCl solution bottle, the gasification dilution mass flow meter and the high temperature vaporization chamber are located on the third switching pipeline, the gasification dilution mass flow meter is connected to the high temperature vaporization chamber through one of the inlets of a Y-shaped nozzle, the HCl solution bottle is connected to the high temperature vaporization chamber through the other inlet of the Y-shaped nozzle via the metering pump, the spray nozzle of the Y-shaped nozzle extends into the high temperature vaporization chamber, and the air outlet of the high temperature vaporization chamber is connected to the standard gas output unit.

6. A multi-form high-precision mercury standard gas generating device according to claim 5, characterized in that: The mercury standard gas generating device further comprises a cleaning unit, the cleaning unit comprises a cleaning tee valve, a waste liquid recovery valve, a pure water bottle and a waste liquid bottle, the cleaning tee valve is connected between the metering pump and the HCl solution bottle, the pure water bottle is connected to the cleaning tee valve, the waste liquid recovery valve is connected between the metering pump and the high temperature vaporization chamber, and the waste liquid bottle is connected to the waste liquid recovery valve.

7. The multi-form high-precision mercury standard gas generation device according to claim 1, characterized in that: The standard gas output unit comprises a standard gas output pipeline, and the elemental mercury standard gas generating unit and the solution gasification unit are connected to a PLC controller.

8. The multi-form high-precision mercury standard gas generating device according to claim 5, characterized in that: The high temperature vaporization chamber and the standard gas output unit are located in a high temperature constant temperature area.

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