CN216050993U - Automatic cleaning device for non-methane total hydrocarbon sampling air bag - Google Patents
Automatic cleaning device for non-methane total hydrocarbon sampling air bag Download PDFInfo
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- CN216050993U CN216050993U CN202122658091.6U CN202122658091U CN216050993U CN 216050993 U CN216050993 U CN 216050993U CN 202122658091 U CN202122658091 U CN 202122658091U CN 216050993 U CN216050993 U CN 216050993U
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Abstract
The utility model belongs to the technical field of analytical instruments and inspection equipment, and relates to an automatic cleaning device for a non-methane total hydrocarbon sampling air bag, which comprises an air inlet pipeline communicated with a high-pressure clean air source and an exhaust pipeline communicated with a waste gas treatment device; the air inlet pipeline comprises an air inlet electromagnetic valve, and the air inlet electromagnetic valve is communicated with a high-pressure clean air source after being sequentially connected with the gas flowmeter, the instant heating type heater and the pressure reducing valve; the exhaust pipeline comprises an exhaust electromagnetic valve which is communicated with the exhaust gas treatment device after being sequentially connected with the air pump and the combustible gas detector; the automatic cleaning device also comprises a central controller and a three-way joint, and the air inlet electromagnetic valve and the air exhaust electromagnetic valve are connected with the sampling air bag through the three-way joint. The automatic cleaning device can accurately control the cleaning times of each sampling air bag with different pollution degrees in a differentiation manner, the air bags are cleaned at one time with high efficiency, the cleaning effect is obvious, the detection qualified rate reaches 100%, and the accuracy of a quantitative result is ensured while the cleaning efficiency is improved.
Description
Technical Field
The utility model belongs to the technical field of analytical instruments and inspection equipment, relates to gas detection and gas bag cleaning, and particularly relates to an automatic cleaning device for a non-methane total hydrocarbon sampling gas bag.
Background
The standards HJ732-2014 "sampling air bag method for fixing volatile organic compounds in pollutant source exhaust gas" and HJ38-2017 "measuring gas chromatography method for fixing total hydrocarbons in pollutant source exhaust gas, methane and non-methane total hydrocarbons" issued by the ministry of environmental protection put forward the judgment requirement for reusable air bags and the requirement for storing reusable air bags. Based on the requirement, the cleaning and detection of the non-methane total hydrocarbon sampling air bag have new standards, and the traditional manual cleaning operation method adopted at present cannot meet the standards.
The traditional manual method has low operation and cleaning efficiency and long time consumption, and is difficult to effectively remove substances adsorbed on the inner wall of the sampling air bag; in addition, during the manual squeezing operation, the polluted gas in the sampling gas bag is easily inhaled by an operator to influence the physical health of the operator, or is discharged into the environment to cause secondary pollution. The utility model discloses a chinese utility model patent that publication number is CN209238628U discloses "an automatic cleaning device for non-methane total hydrocarbon sampling air pocket", and it can wash a plurality of air pockets simultaneously to accessible button operation controlling means is bled fast and is aerifyd the air pocket and wash, and efficiency improves, and has avoided the secondary harm that harmful gas caused to the human body. However, the device also has the defects that the residual quantity of the polluted gas in the sampling air bag can not be monitored in real time, the volume of the gas filled into the sampling air bag can not be controlled, so that differential cleaning can not be carried out, the problems of over-cleaning of a lightly-polluted air bag and insufficient cleaning of a heavily-polluted air bag can exist in the cleaning process, and the problems that the air bag is found to be unqualified in cleaning or a few unqualified air bags are not checked in inspection, and the background is brought in during sampling, so that the quantitative detection accuracy is influenced exist.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the problems in the prior art and provides an automatic cleaning device for a non-methane total hydrocarbon sampling air bag, which can conveniently, quickly, efficiently and pertinently clean the sampling air bag, can control the volume of clean gas filled in the air bag, and effectively and differentially clean the high-content sample air bag, so that the air bag is cleaned efficiently at one time, the cleaning effect is obvious, the residual gas of the cleaned air bag is detected, and the qualification rate reaches 100%.
The technical scheme of the utility model is as follows:
an automatic cleaning device for a non-methane total hydrocarbon sampling air bag comprises an air inlet pipeline communicated with a high-pressure clean air source and an exhaust pipeline communicated with an exhaust gas treatment device; the air inlet pipeline comprises an air inlet electromagnetic valve, and the air inlet electromagnetic valve is communicated with a high-pressure clean air source after being sequentially connected with a gas flowmeter, an instant heating type heater and a pressure reducing valve; the exhaust pipeline comprises an exhaust electromagnetic valve, and the exhaust electromagnetic valve is sequentially connected with an air pump and a combustible gas detector and then communicated with a waste gas treatment device; the automatic cleaning device also comprises a central controller and a three-way joint, and the air inlet electromagnetic valve and the air outlet electromagnetic valve are connected with the sampling air bag through the three-way joint.
Further, the central controller is connected with the touch panel, and makes an automatic cleaning program according to parameters input on the touch panel and sends an instruction; the central controller is connected with the instant heating type heater, the gas flowmeter, the air inlet electromagnetic valve, the air exhaust electromagnetic valve, the air pump and the combustible gas detector.
Furthermore, the parameters input on the touch panel comprise the volume of the sampling air bag and the number of times of post-cleaning, and the touch panel is also provided with a starting function and a stopping function.
Further, an exhaust pipeline of the air pump is connected to a combustible gas detector, and an exhaust pipeline of the combustible gas detector is connected with a filter; the filter is installed between the combustible gas detector and the waste gas treatment device in an overall external installation mode in a mode of being connected through the quick connector.
Furthermore, the sampling air bag is connected to the tee joint through a quick connector; the quick connector is made of polytetrafluoroethylene materials; the filter is an activated carbon filter.
Furthermore, the air inlet pipeline and the exhaust pipeline are formed by connecting air pipeline lines; the gas pipeline and the three-way joint are both made of stainless steel materials; the pressure reducing valve, the instant heating type heater, the gas flowmeter, the gas inlet electromagnetic valve, the gas exhaust electromagnetic valve and the air pump adopt an anti-explosion element which can not generate static electricity.
Furthermore, the system also comprises a power supply which is connected with the central controller.
When the automatic cleaning device is in a standby state, the instant heating type heater, the gas flowmeter, the gas inlet electromagnetic valve, the exhaust electromagnetic valve, the air pump and the combustible gas detector are all in a closed state;
the touch panel displays: 1) sampling the volume 'X' L of the air bag; 2) the number of post-cleaning times is Y; 3) starting; 4) and (5) stopping.
When the air inlet pipeline runs, the central controller sends an instruction, the instant heater is turned on, the gas flowmeter and the air inlet electromagnetic valve are synchronously turned on, the central controller receives the gas flowmeter to measure the air inflow, and when the air inflow reaches 90% of the volume of the sampling air bag input in the touch panel, the central controller sends an instruction, the instant heater is turned off, and the gas flowmeter and the air inlet electromagnetic valve are synchronously turned off;
when the exhaust pipeline runs, the central controller sends an instruction, opens the exhaust electromagnetic valve, synchronously opens the air extracting pump and the combustible gas detector, and sets air extracting duration according to the volume of the sampling air bag input in the touch panel and the air extracting speed divided by the volume of the sampling air bag; in the air extraction process, a combustible gas detector detects whether combustible gas remains in the waste gas flowing through the exhaust pipeline, and a central controller receives signal feedback of the combustible gas detector; after the air pumping time is finished, the central controller sends an instruction to close the exhaust electromagnetic valve and synchronously close the air pump and the combustible gas detector.
The utility model has the beneficial effects that:
(1) the automatic cleaning device for the non-methane total hydrocarbon sampling air bag provided by the utility model can control the cleaning times of each sampling air bag with different pollution degrees in a differentiated and accurate mode, avoids the condition that the sampling air bag is unqualified to be cleaned and needs to be cleaned again when being checked, avoids the condition that few unqualified sampling air bags are not checked to bring the sampling air bag into the background when being checked, improves the cleaning efficiency and ensures the accuracy of a quantitative result.
(2) The heated clean gas is used for cleaning the sampling gas bag, so that the efficiency is higher, and the cleaning effect is better; through the synergistic effect of the central controller, the gas flowmeter and the air pump, the volume of the clean gas filled into the sampling air bag can be accurately controlled, the condition that the sampling air bag is damaged due to excessive filling is avoided, meanwhile, the air pumping duration of the air pump can be accurately controlled, and the condition that the sampling air bag is damaged due to serious deformation caused by excessive air pumping is avoided; the central controller can automatically generate a complete automatic cleaning program of the sampling air bag according to the input instruction, and the whole cleaning process does not need manual intervention from the time when the sampling air bag is connected with the automatic cleaning device until the sampling air bag is completely cleaned, so that the automation degree is improved, and the labor cost is saved.
(3) The utility model uses the high-sensitivity combustible gas detector to detect the concentration of combustible gas in waste gas after the sampling air bag is cleaned, accurately controls the cleaning end point of the sampling air bag, avoids the excessive cleaning of the low-pollution sampling air bag and the insufficient cleaning of the high-pollution sampling air bag, is equivalent to the preliminary acceptance of each cleaned sampling air bag, ensures the acceptance coverage rate to reach 100 percent, and ensures the cleaning effect of the sampling air bag.
(4) This external active carbon filter of self-cleaning device can adsorb the gaseous pollutants in the waste gas, prevents that gaseous pollutants from causing harm to operator and environment.
Drawings
FIG. 1 is a schematic structural diagram of an automatic cleaning apparatus provided in the present invention;
FIG. 2 is a flow chart of the automatic cleaning apparatus provided by the present invention;
in the above figures, 1, a three-way joint; 2. an air inlet solenoid valve; 3. a gas flow meter; 4. an instantaneous heater; 5. a pressure reducing valve; 6. a high pressure purified gas source; 7. an exhaust solenoid valve; 8. an air pump; 9. a combustible gas detector; 10. a filter; 11. an exhaust gas treatment device; 12. a central controller; 13. a touch panel; 14. a power source.
Detailed Description
The utility model is further described below with reference to the figures and examples.
As shown in FIG. 1, the present invention relates to an automatic cleaning device for a non-methane total hydrocarbon sampling gas bag, which comprises an air inlet pipeline communicated with a high-pressure clean gas source 6 and an exhaust pipeline communicated with an exhaust gas treatment device 11; the air inlet pipeline comprises an air inlet electromagnetic valve 2, and the air inlet electromagnetic valve 2 is communicated with a high-pressure clean air source 6 after being sequentially connected with a gas flowmeter 3, an instant heating type heater 4 and a pressure reducing valve 5; the exhaust pipeline comprises an exhaust electromagnetic valve 7, and the exhaust electromagnetic valve 7 is communicated with an exhaust gas treatment device 11 after being sequentially connected with an air pump 8 and a combustible gas detector 9; the automatic cleaning device also comprises a central controller 12 and a three-way joint 1, wherein the air inlet electromagnetic valve 2 and the air outlet electromagnetic valve 7 are connected with a sampling air bag through the three-way joint 1.
In the automatic cleaning device for the non-methane total hydrocarbon sampling air bag, the high-pressure clean air source 6 is clean air without a measured substance, and high-purity nitrogen is selected in the specific embodiment; the automatic cleaning device adopts an instant heating type heater 4, a gas flowmeter 3, a combustible gas detector 9 and a central controller 12. The instant heating type heater 4 is used for instantly heating the clean gas decompressed by the decompression valve 5, and the intensity of the brownian motion of the heated clean gas is superior to that of the normal temperature gas, so that the cleaning effect of the heated clean gas on the polluted gas in the sampling gas bag is superior to that of the normal temperature gas; the gas flowmeter 3 accurately controls the volume of the clean gas filled into the sampling gas bag each time according to the volume of the sampling gas bag, so that the sampling gas bag is prevented from being damaged due to excessive inflation; the combustible gas detector 9 adopts a combustible gas detection element with ultrahigh sensitivity and is used for detecting the residual quantity of combustible gas in the waste gas, the combustible gas detector 9 cannot detect the residual combustible gas in the waste gas as a signal, and the cleaning times of each sampling air bag with different pollution degrees are controlled in a differentiated and accurate mode.
In the present embodiment, the central controller 12 is connected to the touch panel 13 and sends an instruction through an automatic cleaning program set on the touch panel 13; the central controller 12 is connected with the instant heating type heater 4, the gas flowmeter 3, the air inlet electromagnetic valve 2, the air outlet electromagnetic valve 7, the air extracting pump 8 and the combustible gas detector 9. The central controller 12 can receive the instruction input by the touch panel 13 and the signals fed back by the gas flowmeter 3 and the combustible gas detector 9, and controls the instant heating type heater 4, the gas flowmeter 3, the air inlet electromagnetic valve 2, the air outlet electromagnetic valve 7, the air suction pump 8 and the combustible gas detector 9 by sending the instruction.
The central controller 12 automatically generates a complete automatic cleaning program of the sampling air bag according to the parameters input on the touch panel 13 and by combining the received feedback signals, so that after the self-sampling air bag is connected with the automatic cleaning device, the whole cleaning process does not need manual intervention until the sampling air bag is completely cleaned.
The touch panel 13 can be provided with the functions of sampling the volume of the air bag, cleaning times, starting and stopping; the volume of the sampling air bag is a directly input volume parameter, the number of post-cleaning times is generally set to be 3-5, and the number of post-cleaning times is preferably 3 in the specific embodiment.
An exhaust pipeline of the air pump 8 is connected to the combustible gas detector 9, the air pump 8 is also controlled by the central controller 12, and the time length of opening of the air pump 8 each time is accurately controlled by the central controller 12 according to the volume parameter of the sampling air bag input by an operator. In the embodiment, the air pumping duration is calculated and set according to the volume of the sampling air bag divided by the air pumping speed and then 0.5 s; avoid excessively bleeding the serious deformation of the sampling air pocket that leads to the damaged condition, also prevent the sampling air pocket fold that excessive evacuation leads to, influence the life of sampling air pocket, can improve the efficiency of evacuation link simultaneously. The exhaust pipeline of the combustible gas detector 9 is connected with a filter 10; the filter 10 is connected in series in the exhaust pipeline in a mode of being integrally external and connected by a quick connector, and is installed between the combustible gas detector 9 and the exhaust gas treatment device 11.
It can be understood that the sampling air bag is connected to the three-way joint 1 through the quick-connection plug; the quick connector adapted to the sampling air bag is made of polytetrafluoroethylene materials which can not generate adsorption, and is a set of adapter which is convenient to replace, has various inner diameter sizes and is adapted to most air bag connectors on the market. Each component device in the air inlet pipeline and the air outlet pipeline is connected by an air pipeline to form a communicated pipeline system; the gas pipeline, the three-way joint 1, the air inlet electromagnetic valve 2, the exhaust electromagnetic valve 7 and the pressure reducing valve 5 are made of stainless steel materials which can not generate adsorption; for safety, the pressure reducing valve 5, the instantaneous heater 4, the gas flow meter 3, the intake solenoid valve 2, the exhaust solenoid valve 7, and the air pump 8 are explosion-proof elements that do not generate static electricity.
The automatic cleaning device is connected with a power supply 14, and the power supply 14 is connected with the central controller 12 and controls the opening and closing of the whole automatic cleaning device.
As shown in fig. 2, the method for using the automatic cleaning device for the non-methane total hydrocarbon sampling air bag comprises the following steps:
opening the valve of the sampling air bag, inserting the valve interface of the sampling air bag into the quick-connection-peg, setting the volume of the sampling air bag and the number of times of cleaning in the touch panel 13 by an operator, clicking a 'start' button in the touch panel 13, calculating the metering volume required by the feedback signal of the gas flowmeter 3 and the pumping time required by the complete pumping out of the air pump 8 by the central controller 12 according to 90% of the volume 'X' L of the sampling air bag input in the touch panel 13, generating an automatic cleaning program, and starting to operate:
(1) the exhaust flow is operated, the exhaust electromagnetic valve 7, the air pump 8 and the combustible gas detector 9 are opened, and the sampling air bag is closed after being emptied;
(2) the air inlet flow is operated, the instant heating type heater 4, the gas flowmeter 3 and the air inlet electromagnetic valve 2 are opened, and the air inlet flow is closed after clean gas is filled;
(3) the exhaust flow is operated, the sampling air bag is emptied, and the central controller 12 receives a detection signal fed back by the combustible gas detector 9;
(4) if the detection signal fed back by the combustible gas detector 9 is 'detected', repeating the operation (2) and the operation (3) until the detection signal fed back by the combustible gas detector is 'not detected';
(5) if the detection signal fed back by the combustible gas detector 9 is 'no detection', repeating the steps (2) and (3) for 3 times according to the post-cleaning times input in the touch panel 13 for 3 times;
(6) if the signal fed back by the combustible gas detector 9 is 'detected', repeating the operation (2) and the operation (3) in the post-cleaning process, and operating the post-cleaning process (5) until the detection signal fed back by the combustible gas detector is 'no detected';
(7) after the post-cleaning process (5) is finished, the air inlet process (2) is operated, and clean air is filled into the sampling air bag; the automatic cleaning device enters a standby state.
After the automatic cleaning device enters a standby state, closing a valve of the sampling air bag, and taking down the sampling air bag; clicking the "stop" button in the touch panel 13 temporarily terminates the automatic cleaning process that has started but not ended.
In the operation and use process of the automatic cleaning device, the pressure reducing valve 5 is always in an open state.
The steps (5) and (6) of the using method are that after the combustible gas detector 9 preliminarily checks and accepts the cleaning effect of the sampling air bag, a post-cleaning process (generally 3 times) is carried out, if the combustible gas detector 9 detects that the residual polluted gas still exists in the post-cleaning process, the cleaning program needs to be operated again until the post-cleaning process can be operated completely, and the cleaning effect of the sampling air bag is guaranteed.
The step (7) of the using method is filled with clean gas and kept in the sampling gas bag, so that the situation that secondary pollution is caused due to the fact that polluted gas is sucked again under the action of self-deformation force in a vacuum state after the sampling gas bag is evacuated can be avoided; in addition, the state of the sampling air bag can be judged by observing the fullness degree of the sampling air bag before sampling, and if the volume of clean gas in the sampling air bag is obviously reduced, the sampling air bag is proved to be damaged, needs to be discarded and can not be used continuously.
Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that various changes, modifications and substitutions can be made without departing from the spirit and scope of the present invention. Any modification, equivalent replacement, or modification made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The automatic cleaning device for the non-methane total hydrocarbon sampling air bag is characterized by comprising an air inlet pipeline communicated with a high-pressure clean air source and an exhaust pipeline communicated with an exhaust gas treatment device; the air inlet pipeline comprises an air inlet electromagnetic valve, and the air inlet electromagnetic valve is communicated with a high-pressure clean air source after being sequentially connected with a gas flowmeter, an instant heating type heater and a pressure reducing valve; the exhaust pipeline comprises an exhaust electromagnetic valve, and the exhaust electromagnetic valve is sequentially connected with an air pump and a combustible gas detector and then communicated with a waste gas treatment device; the automatic cleaning device also comprises a central controller and a three-way joint, and the air inlet electromagnetic valve and the air outlet electromagnetic valve are connected with the sampling air bag through the three-way joint.
2. The automatic cleaning device according to claim 1, wherein the central controller is connected to the touch panel and sends commands; the central controller is connected with the instant heating type heater, the gas flowmeter, the air inlet electromagnetic valve, the air exhaust electromagnetic valve, the air pump and the combustible gas detector.
3. The automatic cleaning device according to claim 2, wherein the touch panel is provided with a sampling air bag volume, a post-cleaning number, a start and stop function.
4. The automatic cleaning device according to claim 1, wherein an exhaust pipe of the suction pump is connected to a combustible gas detector, and an exhaust pipe of the combustible gas detector is connected to a filter; the filter is installed between the combustible gas detector and the waste gas treatment device in an overall external installation mode in a mode of being connected through the quick connector.
5. The automatic cleaning device according to claim 4, wherein the sampling air bag is connected to the tee connector by a quick connector; the quick connector is made of polytetrafluoroethylene materials; the filter is an activated carbon filter.
6. The automatic cleaning device according to claim 1, wherein the air inlet pipeline and the air exhaust pipeline are formed by connecting air pipeline lines; the gas pipeline and the three-way joint are made of stainless steel materials; the pressure reducing valve, the instant heating type heater, the gas flowmeter, the gas inlet electromagnetic valve, the gas exhaust electromagnetic valve and the air pump all adopt explosion-proof elements which can not generate static electricity.
7. The automatic cleaning device according to claim 1, further comprising a power source connected to the central controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122658091.6U CN216050993U (en) | 2021-11-02 | 2021-11-02 | Automatic cleaning device for non-methane total hydrocarbon sampling air bag |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122658091.6U CN216050993U (en) | 2021-11-02 | 2021-11-02 | Automatic cleaning device for non-methane total hydrocarbon sampling air bag |
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| Publication Number | Publication Date |
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| CN216050993U true CN216050993U (en) | 2022-03-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122658091.6U Active CN216050993U (en) | 2021-11-02 | 2021-11-02 | Automatic cleaning device for non-methane total hydrocarbon sampling air bag |
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- 2021-11-02 CN CN202122658091.6U patent/CN216050993U/en active Active
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