Natural gas particulate matter measuring device

Abstract

The utility model relates to the technical field of natural gas particulate matter detection, in particular to a natural gas particulate matter measuring device. The natural gas particulate matter measuring device comprises a sampling pipe, an exhaust pipe, an emptying pipeline, an optical particle measuring device and a particle capturing device, one end of the sampling pipe is connected with a matched sampling opening in a natural gas pipeline, and the other end of the sampling pipe is connected with an inlet of the optical particle measuring device. An outlet of the optical particle measuring device is connected with an inlet of the particle capturing device through a pipeline, one end of the exhaust pipe is connected with an outlet of the particle capturing device, the other end of the exhaust pipe is connected with the emptying pipeline, and a stop valve and a pressure reducing valve are arranged on the sampling pipe. The device has the advantages of simple and reasonable structural design and capability of conveniently and quickly realizing particle size distribution and mass concentration measurement of the natural gas particulate matters.

Description

Technical Field

[0001] The utility model relates to the technical field of natural gas particle detection, in particular to a natural gas particle measuring device. Background Art

[0002] As a clean energy, natural gas is increasingly being used. Fixed particulate matter is a harmful impurity in natural gas. Due to differences in gas quality and treatment in purification plants, as well as residual impurities during pipeline construction and chemical reactions during operation, natural gas will contain a certain amount of solid particles or dust. The stations of long-distance natural gas pipelines are equipped with filtering and separation equipment to filter solid particles, thereby ensuring the normal operation of important equipment such as compressors, flow meters and valves. The dust content of long-distance pipelines is related to the length of time the pipeline is put into use and the seasonal changes in gas transmission volume. The frequency of cleaning the filter separator at the initial stage of pipeline commissioning is much higher than that after stable operation. GB17820-2018 Natural Gas 5.2 stipulates that solid particles in natural gas should not affect the transportation and utilization of natural gas. In 2023, the National Standardization Administration issued GB / T 43502.1-2023 Determination of natural gas particulate matter Part 1: Determination of particle size distribution by optical method, which provides a method for detecting natural gas particulate matter, and there are also two other methods: spectroscopy and weighing. At present, devices capable of detecting particulate matter in high-pressure natural gas are mostly found in the literature, and natural gas online particulate matter detection equipment is not widely installed and used in gas transmission stations.

[0003] At present, the existing technology CN201637649U atmospheric particle measuring instrument is used for particle detection in atmospheric environment. The disadvantages of this method are as follows: test data limitation: the test data is only for low pressure conditions, and the measurement is performed under reduced pressure. The throttling operation may cause natural gas condensation, and the measurement results cannot fully represent the concentration and particle size distribution of natural gas particles.

[0004] Based on this, in order to overcome the above technical problems, a natural gas particulate matter measuring device is developed. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a natural gas particle measurement device, which effectively overcomes the defects of the prior art.

[0006] The technical solution of the utility model to solve the above technical problems is as follows:

[0007] A natural gas particulate matter measuring device comprises a sampling tube, an exhaust pipe, a venting pipeline, an optical particle measuring device and a particle capturing device, wherein one end of the sampling tube is connected to a sampling port adapted on a natural gas pipeline, the other end of the sampling tube is connected to an inlet of the optical particle measuring device, the outlet of the optical particle measuring device is connected to the inlet of the particle capturing device via a pipeline, one end of the exhaust pipe is connected to the outlet of the particle capturing device, and the other end is connected to the venting pipeline, and a stop valve and a pressure reducing valve are provided on the sampling tube.

[0008] On the basis of the above technical solution, the present invention can also be improved as follows.

[0009] Furthermore, the optical particle measuring device is an optical particle counter.

[0010] Furthermore, the particle capturing device is a particle capturing hydrazine.

[0011] Furthermore, the sampling tube is also provided with a temperature and pressure detector, and the temperature and pressure detector is arranged between the pressure reducing valve and the optical particle measuring device.

[0012] Furthermore, the pressure reducing valve is an electrically controlled valve.

[0013] Furthermore, it also includes a host, and the optical particle measuring device, particle capturing device, pressure reducing valve and temperature and pressure detector are respectively connected to the host.

[0014] Furthermore, a flow regulating valve is provided on the exhaust pipe.

[0015] Furthermore, one end of the sampling tube is connected to a sampling probe.

[0016] Furthermore, a heat preservation device is provided on the pipe section of the sampling pipe corresponding to the pipe section between the pressure reducing valve and the optical particle measuring device, and the heat preservation device is an electric heating plate wrapped on the pipe section.

[0017] Furthermore, one end of the sampling tube is connected in series with a three-way valve.

[0018] The beneficial effects of the utility model are: the structural design is simple and reasonable, and the particle size distribution and mass concentration of natural gas particles can be measured conveniently and quickly. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a natural gas particle measurement device of the utility model;

[0020] Figure 2 This is a schematic structural diagram of another embodiment of the natural gas particulate matter measuring device of the present utility model.

[0021] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0022] 1. Sampling tube; 2. Exhaust pipe; 3. Vent pipeline; 4. Optical particle measuring device; 5. Particle capture device; 6. Stop valve; 7. Pressure reducing valve; 8. Temperature and pressure detector; 9. Flow regulating valve; 10. Three-way valve; 20. Insulation device. DETAILED DESCRIPTION

[0023] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0024] Example 1

[0025] like Figure 1 As shown, the natural gas particulate matter measuring device of this embodiment includes a sampling tube 1, an exhaust pipe 2, a venting pipeline 3, an optical particle measuring device 4 and a particle capturing device 5. One end of the sampling tube 1 is connected to a sampling port adapted on a natural gas pipeline, and the other end of the sampling tube 1 is connected to an inlet of the optical particle measuring device 4. The outlet of the optical particle measuring device 4 is connected to the inlet of the particle capturing device 5 through a pipeline. One end of the exhaust pipe 2 is connected to the outlet of the particle capturing device 5, and the other end is connected to the venting pipeline 3. A stop valve 6 and a pressure reducing valve 7 are provided on the sampling tube 1.

[0026] The usage process is as follows:

[0027] First, connect all pipelines and check the air tightness. After that, open the stop valve 6 to allow the natural gas to enter the sampling tube 1 through the sampling port of the natural gas pipeline. At the same time, operate the pressure reducing valve 7 to adjust the pressure of the natural gas flowing through the sampling tube 1 and the subsequent optical particle measuring device 4, so that the natural gas passes through the optical particle measuring device 4 and the particle capture device 5 in sequence at a set low pressure and a specific flow rate, and finally enters the venting pipeline 3 through the exhaust pipe 2 for discharge. In this process, the optical particle measuring device 4 records the number of different particle sizes and the total number of particles in the natural gas, and performs data statistics and processing according to the standard method (national standard); at the same time, the particle capture device 5 collects and records the gas flow rate per unit time to obtain the cumulative sampling volume. After sampling, it is dried, and the mass difference before and after the capture of the particle capture device 5 is weighed with a high-precision electronic analytical balance to obtain the mass of the particles, and the mass difference is divided by the gas sampling volume to calculate the mass concentration of solid particles in the natural gas pipeline. The entire device has a simple and reasonable structural design, which can conveniently and quickly realize the particle size distribution and mass concentration determination of natural gas particles.

[0028] In this embodiment, the optical particle measuring device 4 adopts an optical particle counter of a suitable model on the market, and performs detection and recording according to the standard method specified by the national standard. Its specific structure and use method are not described in detail here.

[0029] In this embodiment, the particle capture device 5 adopts a particle capture hydrazine of a suitable model on the market (belonging to the prior art), and its specific structure and use method are not described in detail here.

[0030] As a preferred embodiment, the sampling tube 1 is further provided with a temperature and pressure detector 8 , and the temperature and pressure detector 8 is arranged between the pressure reducing valve 7 and the optical particle measuring device 4 .

[0031] In the above implementation scheme, the temperature and pressure detector 8 can detect the real-time temperature and pressure information of the natural gas after being reduced in pressure by the pressure reducing valve 7 before entering the optical particle measuring device 4. The staff can make timely adjustments based on the temperature and pressure information to avoid condensation caused by the natural gas pressure entering the optical particle measuring device 4 being too high and the natural gas temperature entering being too low, thereby ensuring the accuracy of the detection data.

[0032] In this embodiment, the pressure reducing valve 7 is an electrically controlled valve of a suitable model on the market, which is a product of the prior art, and its specific structure and method of use are not described in detail here.

[0033] As a preferred embodiment, a host is also included, and the optical particle measuring device 4, the particle capturing device 5, the pressure reducing valve 7 and the temperature and pressure detector 8 are respectively connected to the host.

[0034] In the above implementation scheme, since the optical particle measuring device 4, the particle capturing device 5, the pressure reducing valve 7 and the temperature and pressure detector 8 are all electronic components or electronic devices, all of the above products and devices are connected to the host, and the host realizes automatic and intelligent control, as well as the collection and arrangement of relevant detection data. Specifically, if the temperature and pressure detector 8 detects that the pressure is too high, the host promptly operates the pressure reducing valve 7 to reduce the pressure, and when the temperature is low, the staff promptly takes certain measures to increase the temperature of the natural gas.

[0035] In this embodiment, the exhaust pipe 2 is provided with a flow regulating valve 9. The flow regulating valve 9 adopts the above-mentioned adapted model product, and by adjusting the flow rate, the natural gas entering the optical particle measuring device 4 enters at a desired flow rate, ensuring accurate detection results.

[0036] In this embodiment, the temperature and pressure detector 8 is an existing integrated voltage stabilization electronic detection device (such as an integrated temperature and pressure detection probe), which is an existing product, and its specific structure and usage method are not described in detail here.

[0037] In this embodiment, a sampling probe is connected to one end of the sampling tube 1. When in use, sampling is completed in accordance with Clause 7.2.1 of GB / T4350.1-2023.

[0038] In this embodiment, the stop valve 6 is a ball valve of a suitable model on the market, and its specific structure and use method are not described in detail here.

[0039] As a preferred embodiment, a heat preservation device 20 is provided on the pipe section between the pressure reducing valve 7 and the optical particle measuring device 4 on the sampling tube 1 , and the heat preservation device 20 is an electric heating plate wrapped on the pipe section.

[0040] In the above embodiment, when the temperature of the natural gas coming out of the pressure reducing valve 7 is low and close to the dew point (condensation temperature), the natural gas in the sampling tube 1 is heated and insulated by the insulation device 20, so that the natural gas subsequently entering the optical particle measuring device 4 will not condense, thereby ensuring smooth detection and accurate results.

[0041] Example 2

[0042] On the basis of Example 1, Figure 2 As shown, one end of the sampling tube 1 is connected in series with a three-way valve 10.

[0043] In this embodiment, the three-way valve 10 is designed to purge and clean the sampling tube 1 through the remaining interface, or to take samples from the remaining interface.

[0044] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0045] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0046] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0048] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0049] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A natural gas particulate matter measuring device, characterized in that: The invention comprises a sampling tube (1), an exhaust pipe (2), a venting pipeline (3), an optical particle measuring device (4) and a particle capturing device (5); one end of the sampling tube (1) is connected to a sampling port adapted on a natural gas pipeline; the other end of the sampling tube (1) is connected to an inlet of the optical particle measuring device (4); the outlet of the optical particle measuring device (4) is connected to the inlet of the particle capturing device (5) via a pipeline; one end of the exhaust pipe (2) is connected to the outlet of the particle capturing device (5) and the other end is connected to the venting pipeline (3); a stop valve (6) and a pressure reducing valve (7) are provided on the sampling tube (1).

2. A natural gas particulate matter measuring device according to claim 1, characterized in that: The optical particle measuring device (4) is an optical particle counter.

3. A natural gas particulate matter measuring device according to claim 1, characterized in that: The particle capturing device (5) is a particle capturing hydrazine.

4. A natural gas particulate matter measuring device according to claim 1, characterized in that: The sampling tube (1) is also provided with a temperature and pressure detector (8), and the temperature and pressure detector (8) is arranged between the pressure reducing valve (7) and the optical particle measuring device (4).

5. A natural gas particulate matter measuring device according to claim 4, characterized in that: The pressure reducing valve (7) is an electrically controlled valve.

6. A natural gas particulate matter measuring device according to claim 5, characterized in that: It also includes a host computer, and the optical particle measuring device (4), the particle capturing device (5), the pressure reducing valve (7) and the temperature and pressure detector (8) are respectively connected to the host computer.

7. A natural gas particulate matter measuring device according to claim 1, characterized in that: The exhaust pipe (2) is provided with a flow regulating valve (9).

8. A natural gas particulate matter measuring device according to claim 1, characterized in that: One end of the sampling tube (1) is connected to a sampling probe.

9. A natural gas particulate matter measuring device according to claim 1, characterized in that: A heat preservation device (20) is provided on the pipe section of the sampling pipe (1) corresponding to the pressure reducing valve (7) and the optical particle measuring device (4), and the heat preservation device (20) is an electric heating plate wrapped around the pipe section.

10. A natural gas particulate matter measuring device according to any one of claims 1 to 9, characterized in that: One end of the sampling tube (1) is connected in series with a three-way valve (10).

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