VOC leakage detection system

Abstract

The utility model discloses a VOC (volatile organic compound) leakage detection system, and aims to provide a VOC leakage detection system which is small in size, explosion-proof and high in detection speed. The device comprises an air source module, a hydrogen source module and a detection module, the detection module comprises a filter, a flow meter, a sampling pump, a first air resistor and an FID explosion-proof detector which are connected in sequence, the filter is arranged on a gas sampling probe, the sampling pump is connected with a PID explosion-proof detector, the PID explosion-proof detector is connected with an oxygen sensor, and the oxygen sensor is connected with the flow meter. And the air source module and the hydrogen source module are both connected with the FID explosion-proof detector. The device is applied to the technical field of gas detection.

Description

Technical Field

[0001] The utility model relates to the technical field of gas detection, in particular to a VOC leakage detection system. Background Art

[0002] VOCs are a general term for organic substances that evaporate easily at room temperature. However, in environmental terms, they refer to a class of reactive volatile organic compounds (VOCs), also known as harmful VOCs. VOCs are organic (carbon-based) gases emitted by many different products, also known as hydrocarbons. VOCs evaporate under sufficient pressure. The main components of VOCs are hydrocarbons, halogenated hydrocarbons, oxygenated hydrocarbons, and nitrogenated hydrocarbons. They include benzene series, organic chlorides, Freon series, organic ketones, amines, alcohols, ethers, esters, acids, and petroleum hydrocarbon compounds.

[0003] Traditional detection methods include combustible gas alarms based on catalytic combustion and gas chromatography-based detectors. However, catalytic combustion-based combustible gas alarms suffer from poor detection sensitivity and long response times. Gas chromatography-based detectors, when deployed in explosion-proof environments such as the petroleum and chemical industries, typically require bulky positive-pressure cabinets. Furthermore, due to high environmental requirements, they often require an instrument shed, resulting in high deployment and operating costs and inconvenient on-site installation. Therefore, there is a need for a compact, explosion-proof, and fast-detecting VOC leak detection system. Utility Model Content

[0004] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a VOC leakage detection system which is small in size, explosion-proof and has a fast detection speed.

[0005] The technical solution adopted by the utility model is: the utility model includes an air source module, a hydrogen source module and a detection module, the detection module includes a filter, a flow meter, a sampling pump, a first air resistance and an FID explosion-proof detector connected in sequence, the filter is arranged on the gas sampling probe, the sampling pump is connected to the PID explosion-proof detector, the PID explosion-proof detector is connected to the oxygen sensor, and the air source module and the hydrogen source module are both connected to the FID explosion-proof detector.

[0006] Furthermore, the hydrogen gas source module includes a hydrogen storage bottle, a pressure sensor, a pressure reducing valve and a second gas resistor connected in sequence, and the second gas resistor is connected to the FID explosion-proof detector.

[0007] Furthermore, the air source module includes a dehydrogenator, an air pump and a third air resistor connected in sequence, and the third air resistor is connected to the FID explosion-proof detector.

[0008] Furthermore, the filter includes a primary filter and a secondary filter connected to each other, and the secondary filter is connected to the flow meter.

[0009] Furthermore, the flow meter is an orifice flow meter.

[0010] Furthermore, the second air resistance is an adjustable air resistance.

[0011] Furthermore, the hydrogen storage bottle is a metal hydride gas storage tank.

[0012] Furthermore, the pressure reducing valve is a three-stage pressure reducing valve.

[0013] The beneficial effects of the utility model are:

[0014] Compared with the deficiencies of the prior art, the present invention adds an air source, which can avoid the situation where the sample gas causes the detector to extinguish when the oxygen content is low, and adding the air source to the FID explosion-proof detector can ensure the normal combustion of the hydrogen flame in the detector, and there will be no fire extinguishing. Secondly, the present invention can quickly detect the leakage point of the equipment, promptly and effectively deal with the leakage point, ensure the safety of personnel and the protection of the environment, and can realize real-time sampling, and the real-time signal value of the sample gas in the detector reflects the concentration of the leakage point. In addition, the present invention can also measure the oxygen content in the sample through the oxygen sensor, which can provide a useful reference for the control and monitoring of volatile organic compounds. Therefore, the present invention can realize real-time sampling, real-time detection in the FID explosion-proof detector, and rapid detection of the total hydrocarbon content, which greatly improves the speed of detecting whether VOC is leaked, ensures the safety of personnel and the environment, and makes the present invention have the advantages of small size, explosion-proof and fast detection speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0016] Figure 1 It is a schematic diagram of the connection relationship of the utility model.

[0017] The reference numerals are as follows:

[0018] 1. Flow meter; 2. Sampling pump; 3. First air block; 5. FID explosion-proof detector; 6. PID explosion-proof detector; 7. Hydrogen storage bottle; 8. Pressure sensor; 9. Pressure reducing valve; 10. Second air block; 11. Hydrocarbon remover; 12. Air pump; 13. Third air block; 15. Primary filter; 16. Secondary filter; 17. Oxygen sensor.

[0019] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0020] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] It should be noted that all directional indications in the embodiments of the present invention, such as up, down, left, right, front, back, clockwise, counterclockwise, etc., are only used to explain the relative position relationship and movement status of the various components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0022] In addition, the descriptions of "first," "second," etc. in this utility model are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this utility model.

[0023] like Figure 1As shown, in this embodiment, the utility model includes an air source module, a hydrogen source module, and a detection module. The detection module includes a filter, a flowmeter 1, a sampling pump 2, a first air block 3, and an FID explosion-proof detector 5, which are connected in sequence. The filter is provided on a gas sampling probe, the sampling pump 2 is connected to a PID explosion-proof detector 6, and the PID explosion-proof detector 6 is connected to an oxygen sensor 17. Both the air source module and the hydrogen source module are connected to the FID explosion-proof detector 5. The sampling probe is used to introduce sample gas and standard gas; the sampling pump 2 is connected to the first air block 3 and the PID explosion-proof detector 6 via a three-way valve; the FID explosion-proof detector 5 is suitable for a miniaturized structure with an explosion-proof design. When in use, it uses hydrogen and sample air to generate a hydrogen flame to ionize and detect organic matter; the PID explosion-proof detector 6 is the preferred detector for use in extreme environments, such as flammable and explosive environments and low-oxygen environments.

[0024] During detection, the sampling pump 2 is set to enable the sampling probe to draw in sample gas, and filter it through the filter installed on the sampling probe, and further enter the PID explosion-proof detector 6 at a flow rate of 700 ml / min, and then pass through the oxygen sensor 17 to measure the oxygen content in the sample. A small part of the sample gas and standard gas is controlled by the first air resistance 3 at a flow rate of 15-30 ml / min to enter the FID explosion-proof detector 5 for combustion; at the same time, the air source enters the FID explosion-proof detector 5 through the air source module; the hydrogen source enters the FID explosion-proof detector 5 through the hydrogen source module.

[0025] Compared with the deficiencies of the prior art, the present invention adds an air source, which can avoid the situation where the sample gas causes the detector to extinguish when the oxygen content is low, and adding the air source to the FID explosion-proof detector 5 can ensure the normal combustion of the hydrogen flame in the detector, and there will be no fire extinguishing. Secondly, the present invention can quickly detect the leakage point of the equipment, promptly and effectively deal with the leakage point, ensure the safety of personnel and the protection of the environment, and can realize real-time sampling, and the real-time signal value of the sample gas in the detector reflects the concentration of the leakage point. In addition, the present invention can also measure the oxygen content in the sample through the oxygen sensor 17, which can provide a useful reference for the control and monitoring of volatile organic compounds. Therefore, the present invention can realize real-time sampling, real-time detection in the FID explosion-proof detector 5, and rapid detection of the total hydrocarbon content, which greatly improves the speed of detecting whether VOC is leaked, ensures the safety of personnel and the environment, and makes the present invention have the advantages of small size, explosion-proof and fast detection speed.

[0026] In certain embodiments, the hydrogen gas source module includes a hydrogen storage bottle 7, a pressure sensor 8, a pressure reducing valve 9, and a second gas resistor 10 connected in sequence. The second gas resistor 10 is connected to the FID explosion-proof detector 5; the second gas resistor 10 is an adjustable gas resistor; the hydrogen storage bottle 7 is a metal hydride gas storage tank; and the pressure reducing valve 9 is a three-stage pressure reducing valve. Specifically, the hydrogen gas source is a metal hydride gas storage tank, which is characterized by low-pressure storage, providing a safe and reliable storage method. The hydrogen gas source displays the pressure of the hydrogen through the pressure sensor 8, and the hydrogen enters the FID explosion-proof detector 5 at a flow rate of approximately 15-30 ml / min through the pressure reducing valve 9 and the second gas resistor 10. In addition, the pressure reducing valve 9 is a three-stage pressure reducing valve 12 and the second gas resistor 10 is an adjustable gas resistor, which gives the pressure reducing valve 9 the advantage of mechanically stabilizing the flow rate, and the three-stage pressure reducing valve and the adjustable gas resistor have the advantages of not requiring software control and mechanically controlling the flow rate.

[0027] In certain embodiments, the air source module includes a dehydrogenator 11, an air pump 12, and a third air block 13, which are connected in sequence. The third air block 13 is connected to the FID explosion-proof detector 5. The third air block 13 functions similarly to the first air block 3 and the second air block 10: it controls the flow rate of gas entering the detector. Specifically, after being purified by the dehydrogenator 11, the air source passes through the third air block 13 to ensure the required air flow rate and enters the FID explosion-proof detector 5 at a flow rate of approximately 200 ml / min.

[0028] In certain embodiments, the filter includes a primary filter 15 and a secondary filter 16 connected to each other. The secondary filter 16 is connected to the flow meter 1; the flow meter 1 is an orifice plate flow meter. Specifically, the primary filter 15 is primarily used to separate water, and the secondary filter 16 is used to filter dust to ensure the purity of the sample gas.

[0029] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A VOC leak detection system, characterized by: The invention comprises an air source module, a hydrogen source module and a detection module, wherein the detection module comprises a filter, a flow meter (1), a sampling pump (2), a first air resistance (3) and an FID explosion-proof detector (5) which are connected in sequence, the filter being arranged on a gas sampling probe, the sampling pump (2) being connected to a PID explosion-proof detector (6), the PID explosion-proof detector (6) being connected to an oxygen sensor (17), and the air source module and the hydrogen source module being both connected to the FID explosion-proof detector (5).

2. A VOC leak detection system according to claim 1, characterized in that: The hydrogen gas source module comprises a hydrogen storage bottle (7), a pressure sensor (8), a pressure reducing valve (9) and a second gas resistor (10) which are connected in sequence, and the second gas resistor (10) is connected to the FID explosion-proof detector (5).

3. The VOC leak detection system according to claim 1, characterized in that: The air source module comprises a dehydrogenator (11), an air pump (12) and a third air resistor (13) which are connected in sequence, and the third air resistor (13) is connected to the FID explosion-proof detector (5).

4. The VOC leak detection system according to claim 1, characterized in that: The filter comprises a primary filter (15) and a secondary filter (16) connected to each other, and the secondary filter (16) is connected to the flow meter (1).

5. The VOC leak detection system according to claim 1, characterized in that: The flow meter (1) is an orifice flow meter.

6. A VOC leak detection system according to claim 2, characterized in that: The second air resistance (10) is an adjustable air resistance.

7. The VOC leak detection system according to claim 2, characterized in that: The hydrogen storage bottle (7) is a metal hydride gas storage tank.

8. The VOC leak detection system according to claim 2, characterized in that: The pressure reducing valve (9) is a three-stage pressure reducing valve.

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