CN218546662U - Avoid flame-out portable FID detector - Google Patents
Avoid flame-out portable FID detector Download PDFInfo
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- CN218546662U CN218546662U CN202221620567.5U CN202221620567U CN218546662U CN 218546662 U CN218546662 U CN 218546662U CN 202221620567 U CN202221620567 U CN 202221620567U CN 218546662 U CN218546662 U CN 218546662U
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- fid detector
- control valve
- detector
- diaphragm pump
- fid
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Abstract
The utility model relates to the technical field of environment detection devices, in particular to a portable FID detector for avoiding flameout, which comprises an FID detector, wherein the FID detector is provided with a hydrogen cylinder and a sample inlet; the FID detector is connected with the sample inlet through a pipeline and is provided with a diaphragm pump; a first control valve is arranged on a pipeline connected between the sample inlet and the diaphragm pump, and a supplementary air inlet is connected with the first control valve; the supplementary air inlet is communicated with air far away from the sampling point; the FID detector is in communication connection with the first control valve through a control unit; the control unit controls the opening and closing of the first control valve according to a signal of the FID detector. The utility model discloses a control unit is to the control of first control valve, and first control valve control supplements the switch of air inlet to guarantee then the in-process have sufficient sample gas, and then guarantee that the detector is flameout not in the course of the work.
Description
Technical Field
The utility model relates to an environment measuring device technical field especially relates to an avoid flame-out portable FID detector.
Background
Volatile Organic Compounds (VOCs) are most characterized by an unorganized emission. The unorganized discharge refers to the random discharge of pollutants without passing through an exhaust funnel. In the oil refining and petrochemical industry, VOC (volatile organic compounds) emission links mainly include leakage of equipment and pipeline components, exhaust in each process of oil refining and petrochemical industry, tail gas emission of a waste gas combustion tower (torch), wastewater volatilization, oil storage and transportation processes and the like.
Portable VOCs detectors are a source of unorganized emissions from production equipment that detect possible leaks. Each flange, valve, device, etc. that may leak is tested to determine the level of leakage, and the concentration of VOCs at such leakage points is typically very high. The FID detector is commercially available in a device that burns combustion gas (hydrogen) and combustion-supporting gas (air). So as long as the gas concentration to be measured is too high, this will result in a reduction in the air content of the equipment, eventually leading to the flame being extinguished and the test being terminated. And the ignition is carried out again after the flameout, so that the operation process is complex and the detection efficiency is influenced.
Disclosure of Invention
The utility model aims at solving the problem that the portable FID detector is easy to extinguish in the prior art, and providing an avoid the portable FID detector of extinguishing.
In order to realize the purpose, the utility model adopts the following technical scheme:
a portable FID detector for avoiding flameout comprises an FID detector, wherein the FID detector is provided with a hydrogen cylinder and a sample inlet; the FID detector is connected with the sample inlet through a pipeline and is provided with a diaphragm pump;
a first control valve is arranged on a pipeline connected between the sample inlet and the diaphragm pump, and a supplementary air inlet is connected with the first control valve; the supplementary air inlet is communicated with air far away from the sampling point;
the FID detector is in communication connection with the first control valve through a control unit; the control unit controls the opening and closing of the first control valve according to a signal of the FID detector.
The portable FID detector ionizes volatile gas in the sample gas through hydrogen combustion by arranging the FID detector, so that high-precision detection is realized. And a diaphragm pump is arranged between the FID detector and the sample inlet. After starting up, the diaphragm pump pumps the sample gas from the sample inlet into the detector. The FID detector is in communication connection with the first control valve through the control unit. The FID detector detection threshold was set at 50000 PPM based on experimental test results. When the concentration detected by the FID detector is more than 50000 PPM, the control unit controls the first control valve to be opened. The first control valve is in communication with the supplemental air inlet. The air content is higher at this location due to the fact that the supplemental air inlet communicates away from the location of the test site. The first control valve is opened, so that air in the detector can be supplemented, and the detector is guaranteed not to be flameout. Meanwhile, the detector displays the full scale, thereby prompting the user that the concentration of VOCs at the position is more than 50000 PPM. If the FID detector detects a concentration of less than 50000 PPM, the first control valve will not open and the FID detector will indicate the actual concentration of VOCs.
Preferably, a second control valve is provided between the diaphragm pump and the FID detector.
A second control valve is provided between the diaphragm pump and the FID detector. Typically, the diaphragm pump pumps a relatively large flow of gas, while the FID detector measures a relatively small flow. The second control valve can be arranged to remove the pumping excess gas.
Preferably, an air resistor is arranged to connect the FID detector; the air resistance connection is provided with a differential pressure sensor.
An air resistor is arranged at the front end of the FID detector, and a differential pressure sensor is arranged on the air resistor. Pressure change in the pipeline is detected through the differential pressure sensor, and the pressure change is fed back to the air resistance control circuit, so that the pressure stability of the pipeline is ensured, and the detection pressure stability of the FID detector is ensured.
Preferably, a pressure reducing valve is provided between the hydrogen cylinder and the FID detector.
The external pressure reducing valve of the hydrogen cylinder ensures the hydrogen pressure required by the FID detector
Compared with the prior art, the utility model discloses following technological effect has:
the utility model discloses an avoid flame-out portable FID detector, through the control of the control unit to first control valve, first control valve control supplements the switch of air inlet to guarantee then the in-process has sufficient sample gas, and then guarantee that the detector is not flame-out in the course of the work.
Drawings
FIG. 1 is a block diagram of the FID detector of the present invention;
FIG. 2 is a flow chart of the present novel FID detector.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.
Example 1
Referring to fig. 1, in an embodiment of the present invention, a portable FID detector for avoiding flameout includes a FID detector, which is provided with a hydrogen cylinder and a sample inlet; the FID detector is connected with the sample inlet through a pipeline and is provided with a diaphragm pump; and a first control valve is arranged on a pipeline connected between the sample inlet and the diaphragm pump. The first control valve is a proportional valve B. The proportional valve B, the sample inlet and the diaphragm pump are connected through a three-way joint. The proportional valve B is connected with a supplementary air inlet; the supplementary air inlet is communicated with air far away from the sampling point; the FID detector is in communication connection with the proportional valve B through a control unit; the control unit controls the switch of the proportional valve B according to the signal of the FID detector. A second control valve is arranged between the diaphragm pump and the FID detector; the second control valve is a proportional valve A. The FID detector is connected with the air inlet of the air inlet pipe; the air resistance connection is provided with a differential pressure sensor. And a pressure reducing valve is arranged between the hydrogen cylinder and the FID detector.
Referring to fig. 2, the testing process of the device is described above. The hydrogen cylinder is opened to release hydrogen, and the hydrogen is decompressed through a decompression valve and enters the FID detector module. And simultaneously, the diaphragm pump is started, and the sample gas enters through the sample inlet. When the FID detector detects that the concentration of VOCs in the sample gas is larger than 50000 PPM, the control unit controls the proportional valve B to open the air entering from the compensation air inlet, and the detector displays the full scale. And when the concentration of the VOCs in the sample gas is detected to be less than 50000 PPM, displaying the real value of the gas concentration. Since the pumping flow of the diaphragm pump is 1L/min and the detection flow of the FID detector is 200mL/min, the control unit removes the redundant gas through the proportional valve A. An air lock is arranged at the front end of the FID detector to stabilize the pressure of the air entering the FID. The pressure of the air resistor is monitored by a differential pressure sensor, and the pressure of the pipeline is adjusted by a control circuit of the air resistor, so that the flow entering the FID detector is stable.
The above, only be the embodiment of the preferred of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, which are designed to be replaced or changed equally, all should be covered within the protection scope of the present invention.
Claims (4)
1. A portable FID detector for avoiding flameout is characterized by comprising an FID detector, wherein the FID detector is provided with a hydrogen cylinder and a sample inlet; the FID detector is connected with the sample inlet through a pipeline and is provided with a diaphragm pump;
a first control valve is arranged on a pipeline connected between the sample inlet and the diaphragm pump, and a supplementary air inlet is connected with the first control valve; the supplementary air inlet is communicated with air far away from the sampling point;
the FID detector is in communication connection with the first control valve through a control unit; the control unit controls the opening and closing of the first control valve according to a signal of the FID detector.
2. The portable FID detector of avoiding flameout as claimed in claim 1, wherein a second control valve is disposed between the diaphragm pump and the FID detector.
3. The portable FID detector for avoiding flameout as claimed in claim 1, wherein an air lock is provided in connection with the FID detector; the air resistance connection is provided with a differential pressure sensor.
4. The portable FID detector of avoiding flameout as claimed in claim 1, wherein a pressure relief valve is disposed between the hydrogen cylinder and the FID detector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221620567.5U CN218546662U (en) | 2022-06-27 | 2022-06-27 | Avoid flame-out portable FID detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221620567.5U CN218546662U (en) | 2022-06-27 | 2022-06-27 | Avoid flame-out portable FID detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218546662U true CN218546662U (en) | 2023-02-28 |
Family
ID=85267453
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221620567.5U Active CN218546662U (en) | 2022-06-27 | 2022-06-27 | Avoid flame-out portable FID detector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218546662U (en) |
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2022
- 2022-06-27 CN CN202221620567.5U patent/CN218546662U/en active Active
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