CN218212811U

CN218212811U - Portable non-methane total hydrocarbon device

Info

Publication number: CN218212811U
Application number: CN202222670191.5U
Authority: CN
Inventors: 陆家波; 叶校波; 吴耀铭
Original assignee: Nanhua Instruments Co ltd
Current assignee: Nanhua Instruments Co ltd
Priority date: 2022-10-11
Filing date: 2022-10-11
Publication date: 2023-01-03
Anticipated expiration: 2032-10-11

Abstract

The utility model relates to a total hydrocarbon analysis appearance field of non-methane specifically discloses a total hydrocarbon device of portable non-methane, detect the flow path including the sample gas, hydrogen supply flow path and hot case, sample gas detects the flow path and is located the hot incasement, sample gas detects the flow path and includes the sample gas entry, still include the high temperature pump with sample gas entry intercommunication in proper order, three way solenoid valve, methane stove and detector, the high temperature pump is equipped with the evacuation mouth, hydrogen supply flow path includes the hydrogen entry, the hydrogen entry is equipped with the cross-under rather than the intercommunication, one of them export intercommunication of cross-under has miniature hydrogen cylinder, another export and the detector intercommunication of cross-under, be equipped with hydrogen storage alloy in the miniature hydrogen cylinder, the high temperature pump is equipped with the buffer tube. The utility model stabilizes the flow of sample gas through the added buffer tube, and improves the stability and accuracy of measurement; meanwhile, the hydrogen storage alloy is arranged in the miniature hydrogen cylinder, so that the space is saved, the heat of the miniature hydrogen cylinder can be preserved by utilizing the external heat of the hot box, the energy consumption is reduced, and the cruising ability is improved.

Description

Portable non-methane total hydrocarbon device

Technical Field

The utility model relates to a total hydrocarbon analysis appearance field of non-methane, in particular to portable total hydrocarbon device of non-methane.

Background

The method is characterized in that almost all volatile organic compounds are responded, the catalytic oxidation combined FID can be divided into two steps, the first step is that sample gas is firstly oxidized by high temperature and catalyst added in a catalytic furnace before entering the FID detector, the residual methane enters the FID detector for detection, and the concentration of the methane is measured; and the second step is that the sample gas directly enters an FID detector for detection without entering a catalytic furnace, the total hydrocarbon concentration of the sample gas is measured, and then the total hydrocarbon concentration is subtracted from the methane concentration to obtain a non-methane total hydrocarbon value.

However, the current measurement method has the following disadvantages: when the hydrogen is used as combustion gas, the common hydrogen cylinder is inflated by pressure difference, when the hydrogen cylinder is inflated by the hydrogen inflating cylinder, the pressure is reduced, and after the pressures of the two cylinders are equal, the hydrogen cylinder can not be inflated, so that the volume of the hydrogen gas is limited, although the volume of the hydrogen cylinder is large, the volume of the hydrogen gas is small, the space area is occupied, and a pressure reducing valve is added before the common hydrogen cylinder is connected with a lower element to protect the lower element, the space is occupied, and an insulation box is additionally arranged for storing the hydrogen gas, so that the heat energy utilization can not be realized, and the energy is wasted.

The technical problem to be solved by the application is as follows: how to improve the stability of a non-methane total hydrocarbon analyzer and the accuracy of measurement and enable resource utilization.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the prior art, the utility model aims to provide a portable non-methane total hydrocarbon device with light weight and good stability.

The utility model discloses the technical scheme who adopts does: a portable non-methane total hydrocarbon device comprises a sample gas detection flow path, a hydrogen supply flow path and a heat box, wherein the sample gas detection flow path is positioned in the heat box, the heat box is used for heating sample gas, the sample gas detection flow path comprises a sample gas inlet, the portable non-methane total hydrocarbon device further comprises a high-temperature pump, a three-way electromagnetic valve, a methane furnace and a detector, the high-temperature pump is sequentially communicated with the sample gas inlet, an evacuation port used for exhausting redundant sample gas is arranged outside the high-temperature pump, the hydrogen supply flow path comprises a hydrogen inlet, the hydrogen inlet is provided with a four-way connector communicated with the hydrogen inlet, one outlet of the four-way connector is communicated with a miniature hydrogen cylinder, the other outlet of the four-way connector is communicated with the detector, hydrogen storage alloy used for storing hydrogen is arranged in the miniature hydrogen cylinder, and the high-temperature pump is also provided with a buffer tube used for stabilizing sample gas flow entering the FID detector.

The sample gas in the sample gas detection flow path is heated by the hot box, the heating temperature is more than 120 ℃, the sample gas is ensured not to be condensed in the whole process, the high-temperature pump works in the hot box, the temperature of the hot box is constant, and the pressure of the high-temperature pump is not influenced by the temperature change, so that the pressure fluctuation change in the sample gas detection flow path is small, the measurement is accurate, the sample gas firstly enters the catalytic furnace through the three-way electromagnetic valve, volatile organic matters except methane are oxidized under the action of the high-temperature environment in the catalytic furnace and a catalyst, the residual methane enters the FID detector to be combusted, the methane concentration is obtained, then the three-way electromagnetic valve is switched, the sample gas directly enters the FID detector through another pipeline, the total hydrocarbon concentration is obtained, and the total hydrocarbon concentration minus the methane concentration is the non-methane total hydrocarbon concentration; the hydrogen storage alloy in the miniature hydrogen cylinder can repeatedly release and absorb hydrogen under certain temperature and condition, so that low-pressure safe hydrogen storage and release are realized, and the miniature hydrogen cylinder can be filled with hydrogen each time due to small volume, and a pressure reducing valve is not required to be additionally arranged at an air outlet of the miniature hydrogen cylinder, so that the space and the weight are saved to the maximum extent; the setting of buffer tube stabilizes the flow of appearance gas and air, avoids influencing measurement stability.

In some embodiments, the detector further comprises an air supply flow path, wherein the air supply flow path comprises an air inlet, and the air inlet is sequentially provided with an air pump, a pressure regulating valve and a zero-gas furnace which are communicated with the air inlet, and the zero-gas furnace is communicated with the detector.

In some embodiments, the standard air flow path further comprises a standard air inlet, the standard air inlet is provided with a needle valve communicated with the standard air inlet, the needle valve is communicated with the high-temperature pump, and a second two-way electromagnetic valve is arranged between the standard air inlet and the needle valve.

In some embodiments, the sample gas detection flow path further comprises a dust filter connected to the sample gas inlet, and a three-way joint is provided between the high-temperature pump and the dust filter, and the three-way joint is sequentially communicated with the dust filter, the high-temperature pump and the needle valve.

In some embodiments, the three-way solenoid valve includes a common port, a normally open port, and a normally closed port, the high temperature pump is in communication with the common port, the methanic furnace is in communication with the normally open port, the detector is in communication with the normally closed port, and the detector is further provided with an exhaust port in communication therewith.

In some embodiments, the hydrogen supply flow path further comprises a check valve disposed between the hydrogen inlet and the four-way connector, the four-way connector is further provided with a pressure gauge and a first two-way solenoid valve respectively communicated therewith, the first two-way solenoid valve is provided with a hydrogen mass flow meter communicated therewith, and the hydrogen mass flow meter is communicated with the detector.

In some embodiments, the air supply flow path further comprises a first air filter and a second air filter sequentially arranged between the air inlet and the air pump, the pressure regulating valve is provided with a pressure sensor communicated with the pressure regulating valve, and an air mass flow meter is arranged between the pressure regulating valve and the zero-air furnace.

The beneficial effects of the utility model reside in that:

the portable non-methane total hydrocarbon device stabilizes the flow of sample gas entering the FID detector through the added buffer tube, thereby improving the stability and accuracy of measurement; meanwhile, the hydrogen storage alloy is arranged in the miniature hydrogen cylinder, so that the space is saved, the heat of the miniature hydrogen cylinder can be preserved by utilizing the external heat of the heat box, the energy consumption is reduced, and the cruising ability is improved.

Drawings

Fig. 1 is a schematic view of the gas circuit of the present invention.

In the figure: 1. a sample gas inlet; 2. a dust filter; 3. a three-way joint; 4. a high temperature pump; 5. a three-way electromagnetic valve; 6. a methane furnace; 7. a FID detector; 8. an FID exhaust port; 9. a hydrogen mass flow meter; 10A, a first two-way electromagnetic valve; 10B, a second two-way electromagnetic valve; 11. a four-way joint; 12. a pressure gauge; 13. a miniature hydrogen cylinder; 14. a one-way valve; 15. a hydrogen inlet; 16. a standard gas inlet; 17. a needle valve; 18. an air inlet; 19. a first air filter; 20. a second air filter; 21. an air pump; 22. a pressure regulating valve; 23. a pressure sensor; 24. a buffer tube; 25. an evacuation port; 26. an air mass flow meter; 27. a zero gas furnace; 30. and (7) heating the box.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying 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. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1, the present invention provides a technical solution: a portable non-methane total hydrocarbon device includes a sample gas measurement flow path, a hydrogen gas supply flow path, an air supply flow path, a standard gas flow path, and a hot box 30.

The sample gas measuring flow path is arranged in a continuously heated hot box 30, the heating temperature of the hot box 30 is more than 120 ℃, the sample gas measuring flow path comprises a sample gas inlet 1, a dust filter 2, a three-way joint 3, a high-temperature pump 4, a three-way electromagnetic valve 5, a methane furnace 6, an FID detector 7, an FID exhaust port 8 and an exhaust port 25, wherein the sample gas enters the dust filter 2 from the sample gas inlet 1 to remove dust particles in the sample gas and then enters the high-temperature pump 4 through the three-way joint 3, because the high-temperature pump 4 has strong high temperature resistance and is suitable for working at high temperature, because the continuous high temperature and the temperature in the hot box 30 are stable, the pressure of the high-temperature pump 4 is not influenced by temperature change, the pressure fluctuation in the sample gas measuring flow path is small, the measuring result is accurate, the sample gas is divided into two paths after passing through the high-temperature pump 4, one path enters the three-way electromagnetic valve 5, the other path is discharged from an emptying port 25, the emptying port 25 discharges redundant sample gas in the high-temperature pump 4 to ensure that only a small amount of sample gas is left, the three-way electromagnetic valve 5 is divided into a public end, a normally open end and a normally closed end, the sample gas in the high-temperature pump 4 enters the methane furnace 6 from the normally open end after entering the public end, total hydrocarbons except methane, namely non-methane total hydrocarbons, are decomposed under the action of high temperature and a catalyst in the methane furnace 6, the residual methane enters the FID detector 7 to be combusted to obtain a methane value, after the three-way electromagnetic valve 5 is electrified, the public end is communicated with the normally closed end, the sample gas bypasses the methane furnace 6 to enter the FID detector 7 to be combusted, the total hydrocarbon value of the sample gas is measured, the methane value is subtracted from the total hydrocarbon value to obtain the non-methane total hydrocarbon value, and residual waste gas and water vapor after combustion are discharged from the FID exhaust port 8;

the hydrogen supply flow path comprises a hydrogen mass flow meter 9, a first two-way solenoid valve 10A, a four-way joint 11, a pressure gauge 12, a miniature hydrogen cylinder 13, a one-way valve 14 and a hydrogen inlet 15, wherein the hydrogen inlet 15 is used when the miniature hydrogen cylinder 13 is filled with hydrogen by an external hydrogen cylinder, the hydrogen flows through the one-way valve 14 and the four-way joint 11 and then is divided into three paths in the four-way joint 11, one path goes to the pressure gauge 12 and is used for reflecting the pressure of the miniature hydrogen cylinder 13, and when the pressure drops to a certain value, a user is prompted to fill the hydrogen; one path goes to a miniature hydrogen cylinder 13; one way is to go to the first and second electromagnetic valves 10A, which is in a normally closed state when not electrified, so when the outside is charged with hydrogen, the first and second electromagnetic valves 10A are in a normally closed state, the hydrogen can only be charged into the micro hydrogen cylinder 13, the normal working state is that the micro hydrogen cylinder 13 discharges the hydrogen, the hydrogen passes through the four-way joint 11, due to the existence of the one-way valve 14, the hydrogen can only pass through the first and second electromagnetic valves 10A, at the moment, the first and second electromagnetic valves 10A are switched from the electrified state to the normally open state, then the hydrogen passes through the hydrogen mass flow meter 9, the hydrogen mass flow meter 9 is an electronic flow meter, the flow can be accurately regulated and controlled through a program, and finally the hydrogen enters the FID detector 7, the micro hydrogen cylinder 13 is internally provided with hydrogen storage alloy, the hydrogen can be repeatedly absorbed and discharged under certain temperature and pressure, the low-pressure safe hydrogen storage and discharge are realized, the pressure of the hydrogen charging and discharging is not higher than 2MPA, the miniature hydrogen cylinder 13 has small volume, so that the miniature hydrogen cylinder can be filled with hydrogen each time, a pressure reducing valve is not required to be added at the air outlet, the space and the weight are saved, the miniature hydrogen cylinder has the advantages of high hydrogen storage density, low storage pressure, good safety and long service life, the endurance time of the portable equipment can be greatly prolonged, the miniature hydrogen cylinder 13 is arranged on the upper surface of the hot box 30, the miniature hydrogen cylinder 13 is heated and insulated by utilizing the heat emitted by the hot box 30, the temperature of the bottle body of the miniature hydrogen cylinder 13 is kept between 10 ℃ and 50 ℃, the miniature hydrogen cylinder 13 can be ensured to continuously release hydrogen, the measurement process is continuous and stable, the process of independently heating the miniature hydrogen cylinder 13 by additionally arranging a heating element and controlling the temperature by using a temperature switch is omitted, the cost is reduced, and the weight is lightened;

the air supply flow path comprises an air inlet 18, a first air filter 19, a second air filter 20, an air pump 21, a pressure regulating valve 22, a pressure sensor 23, a buffer tube 24, an air mass flow meter 26 and a zero-air furnace 27, wherein air enters from the air inlet 18, passes through the first air filter 19 and the second air filter 20 respectively, is primarily filtered to remove dust and hydrocarbons, and then sequentially enters into the air pump 21, the pressure regulating valve 22 and the pressure sensor 23, after the pressure value is preset by the pressure regulating valve 22, the pressure value of the pressure gauge is compared with the pressure sensor 23 to reflect whether the air pressure in the current air supply flow path is normal, after passing through the pressure regulating valve 22, the air enters the three-way joint 3 and then is divided into two paths, one path is sent to the buffer tube 24, and the buffer tube 24 is used for stabilizing redundant sample gas discharged by the high-temperature pump 4, so that the redundant sample gas is prevented from entering the air supply flow path and the stability and accuracy of measurement are influenced; the other path goes to an air mass flow meter 26, the air mass flow meter 26 is an electronic flow meter, the flow can be accurately regulated and controlled through a program, then the air enters a zero gas furnace 27, the zero gas furnace 27 is arranged in a hot box 30, total hydrocarbon is completely oxidized through high-temperature catalyst addition, the total hydrocarbon of an air supply flow path is removed, oxygen in the air is reserved, the oxygen enters an FID detector 7 to play a role in supporting combustion, and meanwhile, the total hydrocarbon of the air supply flow path is removed by the zero gas furnace 27, so that the total hydrocarbon measurement of the sample gas measurement flow path is not interfered by the total hydrocarbon in the air supply flow path, and the measurement is more accurate;

the standard gas flow path comprises a standard gas inlet 16, a second two-way electromagnetic valve 10B and a needle valve 17, wherein standard gas enters the second two-way electromagnetic valve 10B from the standard gas inlet 16, is in a normally closed state when not electrified, is switched to be in a normally open state when electrified, passes through the needle valve 17, passes through the three-way joint 3 and then is divided into two paths, one path enters the high-temperature pump 4, and measurement is carried out according to a sample gas mode to obtain a calibration value; the other path of the standard gas enters a dust filter 2 and is discharged through a sample gas inlet 1, a needle valve 17 controls the flow of the standard gas, the standard gas flow before entering the high-temperature pump 4 is prevented from exceeding the maximum flow value of the high-temperature pump 4, and meanwhile, due to the existence of the three-way joint 3, redundant standard gas can be discharged from the sample gas inlet 1, so that the high-temperature pump 4 is protected.

The utility model discloses a theory of operation and use flow: the hydrogen supply flow path provides quantitative hydrogen for the FID detector 7, the sample gas measurement flow path provides sample gas, these two flow paths get into the combustion chamber of the FID detector 7 after joining through three way connection 3, the air supply flow path provides oxygen of certain proportion for the FID detector 7 from the air, play combustion-supporting effect, hydrogen, sample gas, oxygen three gets into the combustion chamber of the FID detector 7 after the ignition burning, produce the electrical signal, convert into measuring result, the amount of oxygen in hydrogen and the air is respectively by hydrogen mass flow meter 9 and air mass flow meter 26 automatic accurate control.

Finally, it should be noted that the above mentioned embodiments are only preferred examples of the present invention, and not intended to limit the present invention, and although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that the technical solutions described in the foregoing embodiments may be modified or some technical features may be substituted equally. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. Portable non-methane total hydrocarbon device, including sample gas detection flow path, hydrogen supply flow path and hot case (30), its characterized in that, sample gas detection flow path is located hot case (30), hot case (30) are used for the sample gas heating, sample gas detection flow path includes sample gas entry (1), still includes high temperature pump (4), three solenoid valve (5), methane-generating furnace (6) and FID detector (7) with sample gas entry (1) intercommunication in proper order, high temperature pump (4) are equipped with outward and are used for the evacuation mouth (25) of unnecessary sample gas discharge, hydrogen supply flow path includes hydrogen entry (15), hydrogen entry (15) are equipped with four-way connection (11) rather than the intercommunication, one of them export intercommunication of four-way connection (11) has miniature bottle (13), another export and the FID detector (7) intercommunication of four-way connection (11), be equipped with the alloy that is used for storing hydrogen in miniature hydrogen bottle (13), high temperature pump (4) still are equipped with gas flow (24) that are used for stabilizing the sample gas flow that gets into FID detector (7).

2. The portable non-methane total hydrocarbons device according to claim 1, further comprising an air supply flow path, the air supply flow path comprising an air inlet (18), the air inlet (18) being provided with an air pump (21), a pressure regulating valve (22) and a zero gas oven (27) in sequence, the zero gas oven (27) being in communication with the FID detector (7).

3. The portable non-methane total hydrocarbon device according to claim 1, further comprising a standard gas flow path, wherein the standard gas flow path comprises a standard gas inlet (16), the standard gas inlet (16) is provided with a needle valve (17) communicated with the standard gas inlet, the needle valve (17) is communicated with the high temperature pump (4), and a second two-way electromagnetic valve (10B) is arranged between the standard gas inlet (16) and the needle valve (17).

4. The portable non-methane total hydrocarbon device according to claim 1, wherein the sample gas detection flow path further comprises a dust filter (2) connected to the sample gas inlet (1), a three-way joint (3) is arranged between the high temperature pump (4) and the dust filter (2), and the three-way joint (3) is sequentially communicated with the dust filter (2), the high temperature pump (4) and the needle valve (17).

5. The portable non-methane total hydrocarbons device according to claim 1, wherein the three-way solenoid valve (5) comprises a common end, a normally open end and a normally closed end, the high temperature pump (4) is in communication with the common end, the methane furnace (6) is in communication with the normally open end, the FID detector (7) is in communication with the normally closed end, and the FID detector (7) is further provided with a FID vent (8) in communication therewith.

6. The portable non-methane total hydrocarbon device according to claim 2, wherein the hydrogen supply flow path further comprises a check valve (14) provided between the hydrogen inlet (15) and the four-way joint (11), the four-way joint (11) is further provided with a pressure gauge (12) and a first two-way solenoid valve (10A) respectively communicating therewith, the first two-way solenoid valve (10A) is provided with a hydrogen mass flow meter (9) communicating therewith, and the hydrogen mass flow meter (9) is communicated with the FID detector (7).

7. The portable non-methane total hydrocarbons device according to claim 2, wherein the air supply flow path further comprises a first air filter (19) and a second air filter (20) sequentially disposed between the air inlet (18) and the air pump (21), the pressure regulating valve (22) is provided with a pressure sensor (23) communicated therewith, and an air mass flow meter (26) is disposed between the pressure regulating valve (22) and the zero gas furnace (27).