High-pressure hydrogen oil stain detection system

Abstract

The invention discloses a high-pressure hydrogen oil stain detection system which comprises a sampling port, a pressure reduction unit, an adsorption detection unit, a recovery filtering unit and a recovery unit, the sampling port is connected into a main pipeline for conveying high-pressure hydrogen through a sampling pipeline, the pressure reduction unit is connected with the sampling port through a pipeline, an output pipeline of the pressure reduction unit is connected with the adsorption detection unit, the adsorption detection unit comprises an adsorption part and a detection part, the adsorption part is electrically connected with the detection part, and the detection part is integrated with an ARM MCU processor. The capacitance value of the adsorption part is detected, and when the detected value exceeds a set threshold value, an alarm signal is output. According to the invention, flexible detection of the oil stain amount in the high-pressure hydrogen is realized, and pollution to the hydrogen fuel cell vehicle is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of high-pressure hydrogen oil pollution detection, and in particular to a high-pressure hydrogen oil pollution detection system. Background Art

[0002] Hydrogen is a single substance formed by hydrogen element, with chemical formula H2 and molecular weight of 2.01588. Hydrogen is a colorless, odorless, highly flammable and insoluble gas at room temperature and pressure. The density of hydrogen is 0.089g / L (101.325kpa, 0℃), which is only 1 / 14 of air, and is the smallest gas known in the world.

[0003] High-pressure hydrogen storage is a current method of storing hydrogen. Hydrogen can be transported in gas cylinders under high pressure (15.2-70.9 MPa), and can be released directly through the adjustment of a pressure reducing valve. It is convenient and reliable, and is currently the most common and direct method of storing hydrogen.

[0004] High-pressure hydrogen compressors use low-pressure gas at the large-area piston end to drive the generation of high-pressure fluid at the small-area piston end, thereby achieving high-pressure compressed transmission of hydrogen. However, in actual high-pressure hydrogen transmission, oil and dirt are often mixed in due to equipment reasons. Therefore, it is particularly important to detect oil and dirt in the hydrogen received in the hydrogen pipeline. Summary of the invention

[0005] In order to solve the above problems, the present invention provides a high-pressure hydrogen oil pollution detection system, and the specific technical solution is as follows:

[0006] It includes a sampling port, a pressure reduction unit, an adsorption detection unit, a recovery filtration unit and a recovery unit;

[0007] The sampling port is connected to the main pipeline for high-pressure hydrogen transportation through a sampling pipeline, the step-down unit is connected to the sampling port through a pipeline, the output pipeline of the step-down unit is connected to the adsorption detection unit, the adsorption detection unit includes an adsorption part and a detection part, the adsorption part is electrically connected to the detection part, the detection part is integrated with an ARM MCU processor, the capacitance value of the adsorption part is detected, and when the detection value exceeds a set threshold, an alarm signal is output.

[0008] Furthermore, a one-way valve for controlling the direction of the gas and a pneumatic valve for controlling the time interval and duration of gas extraction are provided on the pipeline at the sampling port.

[0009] Furthermore, the pipeline of the pressure reducing unit connected to the sampling port is connected after the one-way valve, and the pressure reducing unit includes a multi-stage pressure reducing device, and the last stage of the pressure reducing device reduces the pressure of the sampled gas to 5Mpa before outputting it.

[0010] Furthermore, the horizontal position of the pipeline inlet of the adsorption detection unit is at least 50 mm lower than the pipeline outlet of the pressure reduction unit.

[0011] Furthermore, the pipeline inlet of the adsorption detection unit is arranged to be inclined at 45° based on the horizontal position.

[0012] Furthermore, the adsorption part includes a spiral stainless steel tube and activated carbon filled in the spiral stainless steel tube. The spiral stainless steel tube is provided with a positive electrode connection, the activated carbon is provided with a negative electrode connection, and the two end openings of the spiral stainless steel tube are also provided with a filter net for sealing.

[0013] Furthermore, the conductivity of the activated carbon filled in the spiral stainless steel tube is 0.7-0.85.

[0014] Furthermore, the filter screen used for sealing the two end openings of the spiral stainless steel tube is 1000 mesh.

[0015] Furthermore, the threshold is set as follows:

[0016] C1=k*C0

[0017] Wherein, C1 represents the set threshold value, C0 represents the test capacitance value, and k represents the relationship coefficient;

[0018] The test capacitance value is obtained as follows:

[0019] Pure high-pressure hydrogen is introduced through the sampling port, and the capacitance value detected by the adsorption detection unit is used as the test capacitance value.

[0020] Furthermore, the acquisition of the test capacitance value further includes:

[0021] After pure high-pressure hydrogen is introduced through the sampling port and the capacitance value detected by the adsorption detection unit is obtained, the set threshold value C1 is obtained;

[0022] Connect the sampling port to the high-pressure hydrogen main pipeline, and detect the current capacitance value through the adsorption detection unit;

[0023] It is determined whether the current capacitance value is greater than the set threshold value C1. If it is, an alarm signal is output. Otherwise, the current capacitance value is used as the test capacitance value and the set threshold value is updated.

[0024] The beneficial effects of the present invention are as follows:

[0025] The present invention fills activated carbon with a certain conductivity in a stainless steel pipe, takes the steel pipe as the positive electrode and the activated carbon as the negative electrode, connects to a processor to detect the capacitance value, and realizes the detection of oil pollution in the introduced hydrogen by comparing the detected capacitance value with the set threshold value; the set threshold value is calculated and obtained according to the capacitance value obtained by testing the device using pure high-pressure hydrogen before the device leaves the factory, and at the same time, after on-site installation, ventilation can be performed for further verification to realize the update of the set threshold value, thereby improving the accuracy of high-pressure hydrogen oil pollution detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the system structure of the present invention. DETAILED DESCRIPTION

[0027] The following description clearly and completely describes the technical solutions in the embodiments of the present invention. Obviously, the described embodiments 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 creative work are within the scope of protection of the present invention.

[0028] In the description of the embodiments of the present invention, it should be noted that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the invention product is usually placed when in use, or the orientation or positional relationship commonly understood by those skilled in the art, or the orientation or positional relationship in which the invention product is usually placed when in use, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0029] In the description of the embodiments of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] Example 1

[0031] Embodiment 1 of the present invention discloses a high-pressure hydrogen oil pollution detection system, such as Figure 1 As shown, the details are as follows:

[0032] The system includes a sampling port, a pressure reduction unit, an adsorption detection unit, a recovery filtration unit and a recovery unit;

[0033] The sampling port is connected to the main pipeline for high-pressure hydrogen delivery through a sampling pipeline, the pressure reduction unit is connected to the sampling port through a pipeline, and the output pipeline of the pressure reduction unit is connected to the adsorption detection unit;

[0034] As a preferred embodiment, a one-way valve for controlling the direction of the gas and a pneumatic valve for controlling the time interval and duration of gas extraction are provided on the pipeline at the sampling port.

[0035] As a preferred embodiment, the pipeline connecting the pressure reducing unit to the sampling port is connected after the one-way valve, and the pressure reducing unit includes a multi-stage pressure reducing device, and the last stage of the pressure reducing device reduces the pressure of the sampled gas to 5Mpa before outputting it.

[0036] As a preferred embodiment, the horizontal position of the pipeline inlet of the adsorption detection unit is at least 50 mm lower than the pipeline outlet of the pressure reduction unit;

[0037] The pipeline inlet of the adsorption detection unit is arranged to be inclined at 45° based on the horizontal position, so as to facilitate the liquefied oil to flow into the adsorption detection unit.

[0038] The adsorption detection unit includes an adsorption part and a detection part, the adsorption part is electrically connected to the detection part, and the detection part is integrated with an ARM MCU processor for detecting the capacitance value of the adsorption part and controlling the detection frequency and detection duration;

[0039] Specifically, the processor is connected to the host computer via the RS485 serial port, and the detection frequency and duration are set via the serial port.

[0040] As a preferred embodiment, the adsorption part includes a spiral stainless steel tube and activated carbon filled in the spiral stainless steel tube, the spiral stainless steel tube is provided with a positive electrode connection, and the activated carbon is provided with a negative electrode connection;

[0041] The activated carbon at the port and the spiral stainless steel tube form a miniature capacitor, with the steel tube as the positive electrode and the activated carbon as the negative electrode.

[0042] Specifically, the capacitance is calculated as follows:

[0043]

[0044] Among them, C represents the capacitance value; f represents the detection signal frequency, which is generally 1Khz; Z represents the impedance of the capacitor; Indicates the phase difference between voltage and current;

[0045] When the detection value exceeds the set threshold, an alarm signal is output and the adsorption part of the adsorption detection unit is replaced.

[0046] As a preferred embodiment, the threshold is set as follows:

[0047] C1=k*C0

[0048] Wherein, C1 represents the set threshold value, C0 represents the test capacitance value, and k represents the relationship coefficient, which can be adjusted according to the actual situation. It is not specifically limited here and can generally be 1.5-2.0;

[0049] The specific relationship value can be flexibly set according to the sensitivity requirements and is not specifically limited here.

[0050] The test capacitance value is obtained as follows:

[0051] Pure high-pressure hydrogen is introduced through the sampling port, and the capacitance value detected by the adsorption detection unit is used as the test capacitance value.

[0052] The two end openings of the spiral stainless steel tube are also provided with filter screens for sealing.

[0053] Specifically, the spiral stainless steel pipe is a high-pressure resistant 304 stainless steel pipe.

[0054] As a preferred embodiment, the conductivity of the activated carbon filled in the spiral stainless steel tube is 0.7-0.85.

[0055] As a preferred embodiment, the filter screen used for sealing the two end openings of the spiral stainless steel tube is 1000 mesh.

[0056] In this embodiment, the recovery filtration unit is arranged after the adsorption detection unit and connected to the output end of the tube body of the adsorption part of the adsorption unit. The recovery filtration unit uses a 1000 mesh filter to filter small particles of activated carbon powder;

[0057] The recovery unit is arranged after the recovery filter unit and is connected to the recovery filter unit for recovering the gas after detection.

[0058] Example 2

[0059] Embodiment 2 of the present invention discloses a high-pressure hydrogen oil pollution detection system, such as Figure 1 As shown, the details are as follows:

[0060] The system includes a sampling port, a pressure reduction unit, an adsorption detection unit, a recovery filtration unit and a recovery unit;

[0061] The sampling port is connected to the main pipeline for high-pressure hydrogen delivery through a sampling pipeline, the pressure reduction unit is connected to the sampling port through a pipeline, and the output pipeline of the pressure reduction unit is connected to the adsorption detection unit;

[0062] As a preferred embodiment, a one-way valve for controlling the direction of the gas and a pneumatic valve for controlling the time interval and duration of gas extraction are provided on the pipeline at the sampling port.

[0063] As a preferred embodiment, the pipeline connecting the pressure reducing unit to the sampling port is connected after the one-way valve, and the pressure reducing unit includes a multi-stage pressure reducing device, and the last stage of the pressure reducing device reduces the pressure of the sampled gas to 5Mpa before outputting it.

[0064] As a preferred embodiment, the horizontal position of the pipeline inlet of the adsorption detection unit is at least 50 mm lower than the pipeline outlet of the pressure reduction unit;

[0065] The pipeline inlet of the adsorption detection unit is arranged to be inclined at 45° based on the horizontal position, so as to facilitate the liquefied oil to flow into the adsorption detection unit.

[0066] The adsorption detection unit includes an adsorption part and a detection part, the adsorption part is electrically connected to the detection part, and the detection part is integrated with an ARM MCU processor for detecting the capacitance value of the adsorption part and controlling the detection frequency and detection duration;

[0067] Specifically, the processor is connected to the host computer via the RS485 serial port, and the detection frequency and duration are set via the serial port.

[0068] As a preferred embodiment, the adsorption part includes a spiral stainless steel tube and activated carbon filled in the spiral stainless steel tube, the spiral stainless steel tube is provided with a positive electrode connection, and the activated carbon is provided with a negative electrode connection;

[0069] The activated carbon at the port and the spiral stainless steel tube form a miniature capacitor, with the steel tube as the positive electrode and the activated carbon as the negative electrode.

[0070] Specifically, the capacitance is calculated as follows:

[0071]

[0072] Among them, C represents the capacitance value; f represents the detection signal frequency, which is generally 1Khz; Z represents the impedance of the capacitor; Indicates the phase difference between voltage and current;

[0073] When the detection value exceeds the set threshold, an alarm signal is output and the adsorption part of the adsorption detection unit is replaced.

[0074] As a preferred embodiment, the threshold is set as follows:

[0075] C1=k*C0

[0076] Wherein, C1 represents the set threshold value, C0 represents the test capacitance value, and k represents the relationship coefficient, which can be adjusted according to the actual situation. It is not specifically limited here and can generally be 1.5-2.0;

[0077] The specific relationship value can be flexibly set according to the sensitivity requirements and is not specifically limited here.

[0078] The test capacitance value is obtained as follows:

[0079] Pure high-pressure hydrogen is introduced through the sampling port, and the capacitance value detected by the adsorption detection unit is used as the test capacitance value.

[0080] The two end openings of the spiral stainless steel tube are also provided with filter screens for sealing.

[0081] As a preferred embodiment, further, the acquisition of the test capacitance value further includes:

[0082] After pure high-pressure hydrogen is introduced through the sampling port and the capacitance value detected by the adsorption detection unit is obtained, the set threshold value C1 is obtained;

[0083] Connect the sampling port to the high-pressure hydrogen main pipeline, and detect the current capacitance value through the adsorption detection unit;

[0084] It is determined whether the current capacitance value is greater than the set threshold value C1. If so, an alarm signal is output. Otherwise, the current capacitance value is used as the test capacitance value, the set threshold value is updated, and the adsorption part of the adsorption detection unit is replaced.

[0085] Specifically, the spiral stainless steel pipe is a high-pressure resistant 304 stainless steel pipe.

[0086] As a preferred embodiment, the conductivity of the activated carbon filled in the spiral stainless steel tube is 0.7-0.85.

[0087] As a preferred embodiment, the filter screen used for sealing the two end openings of the spiral stainless steel tube is 1000 mesh.

[0088] In this embodiment, the recovery filtration unit is arranged after the adsorption detection unit and connected to the output end of the tube body of the adsorption part of the adsorption unit. The recovery filtration unit uses a 1000 mesh filter to filter small particles of activated carbon powder;

[0089] The recovery unit is arranged after the recovery filter unit and is connected to the recovery filter unit for recovering the gas after detection.

[0090] The present invention is not limited to the above-mentioned specific embodiments, but extends to any new features or any new combination disclosed in this specification, as well as any new method or process steps or any new combination disclosed.

Claims

1. A high-pressure hydrogen oil pollution detection system, characterized in that: It includes a sampling port, a pressure reduction unit, an adsorption detection unit, a recovery filtration unit and a recovery unit; The sampling port is connected to the main pipeline for high-pressure hydrogen transportation through a sampling pipeline, the step-down unit is connected to the sampling port through a pipeline, the output pipeline of the step-down unit is connected to the adsorption detection unit, the adsorption detection unit includes an adsorption part and a detection part, the adsorption part is electrically connected to the detection part, the detection part is integrated with an ARM MCU processor, the capacitance value of the adsorption part is detected, and when the detection value exceeds a set threshold, an alarm signal is output.

2. The high-pressure hydrogen oil pollution detection system according to claim 1 is characterized in that: A one-way valve for controlling the direction of the gas and a pneumatic valve for controlling the time interval and duration of gas extraction are arranged on the pipeline at the sampling port.

3. The high-pressure hydrogen oil pollution detection system according to claim 2 is characterized in that: The pipeline of the pressure reducing unit connected to the sampling port is connected after the one-way valve. The pressure reducing unit includes a multi-stage pressure reducing device, and the last stage of the pressure reducing device reduces the pressure of the sampled gas to 5Mpa before outputting it.

4. The high-pressure hydrogen oil pollution detection system according to claim 1 is characterized in that: The horizontal position of the pipeline inlet of the adsorption detection unit is at least 50 mm lower than the pipeline outlet of the pressure reduction unit.

5. The high-pressure hydrogen oil pollution detection system according to claim 4 is characterized in that: The pipeline inlet of the adsorption detection unit is arranged to be inclined at 45° based on the horizontal position.

6. The high-pressure hydrogen oil pollution detection system according to claim 1 is characterized in that: The adsorption part includes a spiral stainless steel tube and activated carbon filled in the spiral stainless steel tube. The spiral stainless steel tube is provided with a positive electrode connection, the activated carbon is provided with a negative electrode connection, and the two end openings of the spiral stainless steel tube are also provided with filter nets for sealing.

7. The high-pressure hydrogen oil pollution detection system according to claim 6, characterized in that: The conductivity of the activated carbon filled in the spiral stainless steel tube is 0.7-0.

85.

8. The high-pressure hydrogen oil pollution detection system according to claim 6, characterized in that: The filter screens used for sealing the two end openings of the spiral stainless steel tube are 1000 meshes.

9. The high-pressure hydrogen oil pollution detection system according to claim 1, characterized in that: The thresholds are set as follows: C1=k*C0 Wherein, C1 represents the set threshold value, C0 represents the test capacitance value, and k represents the relationship coefficient; The test capacitance value is obtained as follows: Pure high-pressure hydrogen is introduced through the sampling port, and the capacitance value detected by the adsorption detection unit is used as the test capacitance value.

10. The high-pressure hydrogen oil pollution detection system according to claim 9, characterized in that: The acquisition of the test capacitance value also includes: After pure high-pressure hydrogen is introduced through the sampling port and the capacitance value detected by the adsorption detection unit is obtained, the set threshold value C1 is obtained; Connect the sampling port to the high-pressure hydrogen main pipeline, and detect the current capacitance value through the adsorption detection unit; It is determined whether the current capacitance value is greater than the set threshold value C1. If it is, an alarm signal is output. Otherwise, the current capacitance value is used as the test capacitance value and the set threshold value is updated.

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