Multi-flow-path automatic calibration system for gas analyzer

Abstract

The utility model provides a multi-flow-path automatic standard-passing calibration system of a gas analyzer, which comprises a sample gas collection module used for collecting sample gas; a plurality of standard gas cylinders, wherein each standard gas cylinder is filled with standard gas with different concentrations; the multi-channel switching valve comprises a plurality of gas inlet channels and a gas outlet channel, each gas inlet channel is provided with an on-off switch, the sample gas collection module is connected with one gas inlet channel on the multi-channel switching valve, and the plurality of standard gas cylinders are respectively connected with the plurality of gas inlet channels on the multi-channel switching valve in a one-to-one correspondence manner through standard gas pipelines; the gas outlet channel is connected with a gas inlet of the dehumidification module through a first gas outlet pipeline, and a gas outlet of the dehumidification module is connected with the gas analyzer through a second gas outlet pipeline; and the control unit is electrically connected with the multi-channel switching valve and is used for controlling on and off of each on-off switch. The problems of complicated operation, high labor cost and low calibration efficiency of a standard-passing calibration mode of the gas analyzer in the prior art are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to gas analyzer calibration technical field especially, relate to a kind of multi-flow path automatic pass standard calibration system of gas analyzer. BACKGROUND

[0002] At present, rapid economic development and energy consumption bring great pressure to China's atmospheric environment governance. China's air pollution problem is very serious, while suffering from serious particulate pollution, the concentration of ozone, sulfur dioxide, nitrogen oxides and carbon monoxide and other gases is also high, these gas pollutants will affect human health on the one hand, on the other hand, also participate in atmospheric photochemical reaction, directly or indirectly cause the increase of particulate concentration in the atmosphere and other photochemical pollution. Therefore, accurate measurement of gas pollutants is very important for understanding the characteristics and trend of air pollution.

[0003] Atmospheric composition detection is mainly through gas analyzer professional instrument to detect atmosphere for a long time, and to ensure the accuracy and stability of instrument measurement value, it is necessary to calibrate the analyzer regularly. When calibration, a variety of different concentration of standard gas is used to pass into gas analyzer for calibration, to judge whether the gas analyzer detection is accurate, if the detection is not accurate, it needs to be debugged. The traditional calibration method of gas analyzer is to cut off the sample gas pipeline of gas analyzer manually, then connect the standard gas bottle with the same concentration of standard gas to the gas analyzer for calibration, after the calibration of the standard gas with the same concentration, the standard gas bottle with other concentration needs to be switched manually. This pass standard calibration method wastes manpower and time, and the operation is complicated, and the calibration efficiency is low. SUMMARY

[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of the utility model is to provide a kind of multi-flow path automatic pass standard calibration system of gas analyzer, to solve the problems of complicated operation, high labor cost and low calibration efficiency of the pass standard calibration method of gas analyzer in the prior art.

[0005] To achieve the above object and other related objects, the utility model provides a kind of multi-flow path automatic pass standard calibration system of gas analyzer, including sample gas collection module, the sample gas collection module is used to collect sample gas;Multiple standard gas cylinders, different concentrations of standard gas are contained in each standard gas cylinder;Multi-channel switching valve, including multiple gas inlet channels and a gas outlet channel, each gas inlet channel is equipped with on-off switch, the sample gas collection module is connected with one gas inlet channel on the multi-channel switching valve, multiple standard gas cylinders are connected with multiple gas inlet channels on the multi-channel switching valve one by one by standard gas pipeline;Dehumidification module, the gas outlet channel is connected with the gas inlet of the dehumidification module by first gas outlet pipeline, and the gas outlet of the dehumidification module is connected with gas analyzer by second gas outlet pipeline;Control unit, the control unit is electrically connected with the multi-channel switching valve, for controlling the opening and closing of the on-off switch on each gas inlet channel.

[0006] Further, mass flow controller is further provided on the first gas outlet pipeline.

[0007] Further, the dehumidification module includes nanometer pipe and zero gas generation unit, the nanometer pipe includes sample gas path and purge gas path, the purge gas path is coaxially arranged with the sample gas path, and the sample gas path is sleeved in the purge gas path;The zero gas generation unit can generate pure and dry air, and the zero gas generation unit is communicated with one end of the purge gas path by zero gas pipeline.

[0008] Further, the zero gas generation unit includes air compressor, first filter, zero gas generator, pressure regulating valve and first flowmeter, wherein the air compressor is connected with the gas inlet end of the zero gas pipeline, the first filter, the zero gas generator, the pressure regulating valve and the flowmeter are all arranged on the zero gas pipeline, and the first filter is located between the air compressor and the zero gas generator, and the pressure regulating valve and the first flowmeter are located behind the zero gas generator.

[0009] Further, the sample gas collection module includes sample gas collection tube and sample gas inlet tube, the first end of the sample gas collection tube is used to collect sample gas, the second end of the sample gas collection tube is connected with the first end of the sample gas inlet tube, and the second end of the sample gas inlet tube is connected with one gas inlet channel on the multi-channel switching valve.

[0010] Further, the gas analyzer is provided with an air extraction pipeline, one end of the air extraction pipeline is connected with the gas analyzer, the other end of the air extraction pipeline is externally exhausted, and an air extraction pump is arranged on the air extraction pipeline; the second end of the sample gas collection pipe is connected with the air inlet of a three-way joint, the first end of the sample gas inlet pipe is connected with the first air outlet of the three-way joint, and the second air outlet of the three-way joint is connected with the air extraction pipeline through an air exhaust pipeline.

[0011] Further, the air exhaust pipeline is sequentially provided with a second filter and a flow limiting hole.

[0012] Further, the second air outlet pipeline is further connected with an air exhaust bypass, and the air exhaust bypass is provided with a second flow meter.

[0013] Further, the second flow meter is a float flow meter.

[0014] Further, five standard gas bottles are arranged, and eight air inlet channels are arranged on the multi-channel switching valve.

[0015] As described above, the multi-flow path automatic standard gas calibration system of the gas analyzer has the following beneficial effects: through the multi-flow path automatic standard gas calibration system of the gas analyzer, automatic switching between sample gas and multiple different standard gas concentrations can be realized, so that automatic standard calibration and sampling detection can be realized, human intervention can be greatly avoided, labor cost can be saved, and calibration efficiency is high. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 A structure schematic diagram of the multi-flow path automatic standard gas calibration system of the gas analyzer is shown.

[0017] MARKS

[0018] 11 sample gas collection pipe

[0019] 110 water blocking filter

[0020] 12 sample gas inlet pipe

[0021] 13 three-way joint

[0022] 14 air exhaust pipeline

[0023] 141 second filter

[0024] 142 flow limiting hole

[0025] 101 air extraction pipeline

[0026] 1010 air extraction pump

[0027] 20 standard gas bottle

[0028] 201 gas supply line

[0029] 30 multi-channel switching valve

[0030] 301 gas inlet channel

[0031] 301a on-off switch

[0032] 302 gas outlet channel

[0033] 3021 first gas outlet line

[0034] 40 dehumidification module

[0035] 401 second gas outlet line

[0036] 402 exhaust bypass

[0037] 4021 second flow meter

[0038] 41 nanometer filter

[0039] 420 zero gas line

[0040] 421 first filter

[0041] 422 zero gas generator

[0042] 423 pressure regulating valve

[0043] 424 first flow meter

[0044] 50 control unit

[0045] 60 mass flow controller

[0046] 100 gas analyzer DETAILED DESCRIPTION

[0047] The embodiments of the present application will be described in detail with specific examples. Other advantages and effects of the present application can be easily understood by those skilled in the art from the contents disclosed in the present specification. The present application can also be implemented or applied in other different embodiments, and the details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present application.

[0048] In the description of the utility model, it is necessary to explain that, unless otherwise provided and limited, the terms "installation", "connection", "connection" should be understood broadly, for example, it can be fixed connection, can also be detachable connection, or integrally connected, can be mechanical connection, can also be electrical connection, can be directly connected, can also be connected through the intermediate medium, can be the communication inside two elements.For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0049] In the description of the utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like in the utility model is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and is not indicative or suggestive of the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the utility model.In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicative or suggestive of relative importance.

[0050] Please refer to Figure 1 It should be noted that the diagrams provided in the embodiments only illustrate the basic concept of the utility model in a schematic manner, and only show the components related to the utility model in the drawings, not the number, shape and size of the components when actually implemented, and the shape, number and proportion of each component when actually implemented can be changed arbitrarily, and the component layout pattern can be more complex.

[0051] The utility model provides a kind of multi-flow path automatic pass standard calibration system of gas analyzer, such as Figure 1As shown, the calibration system comprises a sample gas collection module, a plurality of standard gas bottles 20, a multi-channel switching valve 30, a dehumidification module 40 and a control unit 50, wherein the sample gas collection module is used to collect sample gas, the plurality of standard gas bottles 20 are filled with standard gas of different concentrations, the switching valve 30 comprises a plurality of gas inlet channels 301 and a gas outlet channel 302, each gas inlet channel 301 is provided with a on-off switch 301a, the sample gas collection module is connected to one of the gas inlet channels 301 of the multi-channel switching valve 30, the plurality of standard gas bottles 20 are connected to the plurality of gas inlet channels of the multi-channel switching valve 30 one by one through standard gas pipelines 201, the gas outlet channel 302 of the multi-channel switching valve 30 is connected to the gas inlet of the dehumidification module 40 through a first gas outlet pipeline 3021, and the gas outlet of the dehumidification module 40 is connected to the gas analyzer 100 through a second gas outlet pipeline 401; the control unit 50 is electrically connected to the multi-channel switching valve 30, and the control unit 50 is used to control the opening and closing of the on-off switch 301a of each gas inlet channel 301 of the multi-channel switching valve 30.

[0052] The multi-flow automatic standard calibration system of the gas analyzer has the following beneficial effects: when the multi-flow automatic standard calibration system of the gas analyzer is in normal operation, the on-off switch 301a of the gas inlet channel 301 connected to the sample gas collection module is opened by the control unit 50, and the on-off switches of the other gas inlet channels are closed, so that the sample gas (ambient air) collected by the sample gas collection module enters the dehumidification module 40 through the first gas outlet pipeline 3021 and is dehumidified, and then enters the gas analyzer 100 through the second gas inlet pipeline 401 for detection of ambient air; when the gas analyzer needs to be calibrated, the gas inlet channel connected to the sample gas collection module is closed by the control unit 50, the gas inlet channel connected to the standard gas bottle containing standard gas of a to-be-detected concentration is opened, so that the standard gas of the concentration enters the dehumidification module 40 through the first gas outlet pipeline 3021 and is dehumidified, and then enters the gas analyzer 100 through the second gas outlet pipeline 401 for calibration; after the calibration of the standard gas of the concentration is completed, the gas inlet channel connected to the standard gas bottle containing the standard gas of the concentration is closed, and the gas inlet channel connected to the standard gas bottle containing standard gas of another concentration is opened, and so on, so that the gas analyzer 100 is calibrated with standard gas of different concentrations; after the calibration is completed, the gas inlet channels connected to the standard gas bottles are closed by the control unit 50, the gas inlet channel connected to the sample gas collection module is opened, and the normal detection of ambient air is continued. In summary, the multi-flow automatic standard calibration system of the gas analyzer can automatically switch between sample gas and standard gas of different concentrations, thereby realizing automatic standard calibration and sampling detection, greatly avoiding human intervention, saving labor costs, and improving calibration efficiency.

[0053] Further, the inlet Figure 1 As shown, in the present embodiment, the first outlet gas pipeline 3021 is further provided with a mass flow controller 60. When performing the standard calibration and normal sampling detection of atmospheric components, the mass flow controller 60 can accurately control the flow of standard gas and sample gas to the gas analyzer, and the mass flow controller 60 can also observe the flow size of the standard gas flow during standard calibration and the size of the sample gas flow during sampling detection in real time.

[0054] Further, in order to further control the flow of sample gas or standard gas to the gas analyzer 100, in the present embodiment, an exhaust bypass 402 is further connected to the second outlet gas pipeline 401, and the exhaust bypass 402 is provided with a second flow meter 4021. The gas analyzer quantitatively extracts gas when performing sampling detection or standard calibration, so when the flow of sample gas or standard gas to the gas analyzer 100 is too much, the excess sample gas or standard gas will be discharged from the exhaust pipeline 402. Specifically, in the present embodiment, the second flow meter 4021 is a float flow meter

[0055] Further, as Figure 1 As shown, in the present embodiment, the dehumidification module 40 includes a nanometer tube 41 and a zero gas generating unit capable of generating pure and dry air (zero gas), and the zero gas generating unit is connected to one end of the nanometer tube 41 through a zero gas pipeline 420. When dehumidifying, the moisture in the sample gas and the standard gas is removed based on the humidity difference between the inside and outside of the nanometer tube 41. Specifically, the nanometer tube includes a sample gas path and a purge gas path, and the purge gas path is coaxially arranged with the sample gas path, and the sample gas path is sleeved inside the purge gas path, wherein the sample gas path is used to pass the atmospheric sample gas or standard gas to the gas analyzer, and when the atmospheric sample gas or standard gas passes through the sample gas path of the nanometer tube, the moisture in the atmospheric sample gas or standard gas will penetrate into the purge gas path, the zero gas pipeline 420 is connected to one end of the purge gas path of the nanometer tube 41, and the pure and dry air generated by the zero gas generating unit is introduced into the purge gas path through the zero gas pipeline 420, so that the moisture penetrated into the purge gas path is blown out from the other end of the purge gas path, thereby realizing the dehumidification and drying of the atmospheric sample gas or standard gas. Preferably, in order to improve the dehumidification effect, the flow direction of the zero gas (pure and dry air) in the purge gas path is opposite to the flow direction of the sample gas in the sample gas path.

[0056] Further, as Figure 1As shown, in the embodiment, the zero air generating unit comprises an air compressor (not shown in the figure), a first filter 421, a zero air generator 422, a pressure regulating valve 423 and a first flow meter 424. Specifically, the air compressor is connected with the air inlet end of the zero air pipeline 420, the first filter 421, the zero air generator 422, the pressure regulating valve 423 and the first flow meter 424 are all arranged on the zero air pipeline 420, the first filter 421 is located between the air compressor and the zero air generator 422, and the pressure regulating valve 423 and the first flow meter 424 are located behind the zero air generator 422. During operation, as shown, Figure 1 As shown, the air compressor first passes the compressed air into the first filter 421 for preliminary dehumidification and impurity removal, and then passes the compressed air into the zero air generator 422 for professional water removal and dust removal, so as to generate pure and dry air, and then passes the air into the nanometer pipeline 41 through the pressure regulating valve 423 and the first flow meter 424. Through the arrangement of the pressure regulating valve 423 and the first flow meter 424, the pressure and flow of the zero air passing into the nanometer pipeline can be adjusted. Specifically, in the embodiment, the first flow meter 424 is a float flow meter.

[0057] Further, as shown, Figure 1 In the embodiment, the sample gas collecting module comprises a sample gas collecting pipeline 11 and a sample gas inlet pipeline 12. The first end of the sample gas collecting pipeline 11 is used for collecting sample gas, i.e. ambient air. The second end of the sample gas collecting pipeline 11 is connected with the first end of the sample gas inlet pipeline 12. The second end of the sample gas inlet pipeline 12 is connected with an air inlet channel 301 of the multi-channel switching valve 30. Specifically, in the embodiment, a water-blocking filter 110 is arranged at the first end of the sample gas collecting pipeline 11.

[0058] Further, considering that the first end of the sample gas collection pipe 11 is usually located on the sampling tower, the sample gas collected by the first end of the sample gas collection pipe 11 has a long path to the gas analyzer 100, and the gas replacement is slow, therefore, in order to accelerate the time of gas replacement and improve the detection efficiency, preferably, a gas extraction pipeline 101 is arranged on the gas analyzer 100, one end of the gas extraction pipeline 101 is connected with the gas analyzer 100, the other end of the gas extraction pipeline 101 is externally exhausted, and a gas extraction pump 1010 is arranged on the gas extraction pipeline 101; correspondingly, the second end of the sample gas collection pipe 11 is connected with the sample gas inlet pipe 12 through a three-way joint 13, that is, the second end of the sample gas collection pipe 11 is connected with the gas inlet port of the three-way joint 13, the first end of the sample gas inlet pipe 12 is connected with the first gas outlet port of the three-way joint 13, and the second gas outlet port of the three-way joint 13 is connected with the gas extraction pipeline 101 through the exhaust pipeline 14. Through this structural design, when sampling and detection are performed, the sample gas is provided with a suction force by the gas extraction pump 1010, the flow speed is accelerated, the collected sample gas quickly reaches the position of the three-way joint 13, then part of the sample gas is exhausted outward through the exhaust pipeline 14 and the gas extraction pipeline, and the other part of the sample gas flows downward through the multi-channel switching valve 30, the first gas outlet pipeline 3021, the mass flow controller 60, the nanometer pipeline 41 and the second gas outlet pipeline 401 to enter the gas analyzer 100 for detection.

[0059] Further, in order to limit the gas flow passing through the exhaust pipeline 14, prevent too much sample gas flowing to the exhaust pipeline 14 from the three-way joint 13, and cause too little sample gas flowing to the gas analyzer, preferably, as shown in Figure 1 in the embodiment, a second filter 141 and a flow limiting hole 142 are sequentially arranged on the exhaust pipeline 14, that is, the second filter 141 is located upstream of the flow limiting hole 142. Through this structural design, the flow limiting hole 142 can accurately limit the flow of gas passing through, thereby accurately controlling the flow of sample gas flowing to the exhaust pipeline 14, and preventing most of the sample gas reaching the three-way joint 13 from being exhausted from the exhaust pipeline 14. In addition, the second filter 141 is arranged upstream of the flow limiting hole 142, which can make the gas pass through the second filter 141 first to remove the water and particles in the gas, and then exhaust through the flow limiting hole 142, thereby preventing the water and particles in the gas from causing the flow limiting hole to be blocked.

[0060] Specifically, as shown in Figure 1 in the embodiment, five standard gas cylinders are arranged, the five standard gas cylinders are filled with standard gas with different concentrations, and eight gas inlet channels 301 are arranged on the multi-channel switching valve 30. Of course, it should be noted that in other optional embodiments, the number of standard gas cylinders and the number of gas inlet channels arranged on the multi-channel switching valve can also be set to any number according to requirements.

[0061] In summary, the multi-flow automatic pass-through standard calibration system of the gas analyzer can realize automatic switching between sample gas and multiple different standard gas concentrations, thereby realizing automatic pass-through standard calibration and sampling detection, being flexible in configuration, simple and easy to operate, greatly avoiding human intervention, saving labor cost, and being high in calibration efficiency.

[0062] The above embodiments only exemplarily illustrate the principles and effects of the utility model, and are not used to limit the utility model. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the utility model. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought disclosed by the utility model should be covered by the claims of the utility model.

Claims

1. A multi-stream automated pass-through calibration system for a gas analyzer, comprising: The utility model relates to a gas analysis system, including: a sample gas collecting module for collecting sample gas; a plurality of standard gas cylinders, each containing standard gas of different concentrations; a multi-channel switching valve including a plurality of gas inlet channels and a gas outlet channel, each of the gas inlet channels being provided with an on-off switch, the sample gas collecting module being connected to one of the gas inlet channels of the multi-channel switching valve, and the plurality of standard gas cylinders being connected to the plurality of gas inlet channels of the multi-channel switching valve through standard gas pipelines one by one; a dehumidification module, the gas outlet channel being connected to the gas inlet of the dehumidification module through a first gas outlet pipeline, and the gas outlet of the dehumidification module being connected to a gas analyzer through a second gas outlet pipeline; a control unit electrically connected to the multi-channel switching valve for controlling the opening and closing of the on-off switches of each of the gas inlet channels.

2. A multi-stream automated reference calibration system for a gas analyzer according to claim 1, wherein, The first gas outlet pipeline is further provided with a mass flow controller.

3. A multi-stream automated reference calibration system for a gas analyzer according to claim 1, wherein, The dehumidification module includes a nanometer tube and a zero gas generating unit, the nanometer tube including a sample gas path and a purge gas path, the purge gas path being coaxially arranged with the sample gas path, and the sample gas path being sleeved inside the purge gas path; The zero gas generating unit can generate pure and dry air, and the zero gas generating unit is connected to one end of the purge gas path through a zero gas pipeline.

4. A multi-stream automated reference calibration system for a gas analyzer according to claim 3, wherein, The zero gas generating unit includes an air compressor, a first filter, a zero gas generator, a pressure regulating valve, and a first flowmeter, wherein the air compressor is connected to the gas inlet end of the zero gas pipeline, the first filter, the zero gas generator, the pressure regulating valve, and the flowmeter are all arranged on the zero gas pipeline, the first filter is located between the air compressor and the zero gas generator, and the pressure regulating valve and the first flowmeter are located behind the zero gas generator.

5. A multi-stream automated reference calibration system for a gas analyzer according to claim 1, wherein, The sample gas collecting module includes a sample gas collecting tube and a sample gas inlet tube, the first end of the sample gas collecting tube being used for collecting sample gas, the second end of the sample gas collecting tube being connected to the first end of the sample gas inlet tube, and the second end of the sample gas inlet tube being connected to one of the gas inlet channels of the multi-channel switching valve.

6. A multi-stream automated reference calibration system for a gas analyzer according to claim 5, wherein, The gas analyzer is provided with a gas extraction pipeline, one end of the gas extraction pipeline being connected to the gas analyzer, the other end of the gas extraction pipeline being externally vented, and the gas extraction pipeline being provided with a gas extraction pump; the second end of the sample gas collecting tube is connected to the gas inlet of a three-way joint, the first end of the sample gas inlet tube is connected to the first gas outlet of the three-way joint, and the second gas outlet of the three-way joint is connected to the gas extraction pipeline through an exhaust pipeline.

7. A multi-stream automated reference calibration system for a gas analyzer according to claim 6, wherein, The exhaust pipeline is sequentially provided with a second filter and a flow limiting hole.

8. A multi-stream automated reference calibration system for a gas analyzer according to claim 1, wherein, The second gas outlet pipeline is further connected to an exhaust bypass, and the exhaust bypass is provided with a second flowmeter.

9. A multi-stream automated reference calibration system for a gas analyzer according to claim 8, wherein, The second flowmeter is a float flowmeter.

10. A multi-stream automated reference calibration system for a gas analyzer according to claim 1, wherein, There are five standard gas cylinders, and the multi-channel switching valve is provided with eight gas inlet channels.

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