On-line sampling device and detection method for solid particle content in liquid-carrying raw material gas

Abstract

The application provides an on-line sampling device for solid particle content in liquid-carrying raw gas, which has high sampling representation, low separation equipment cost and small size, and provides an on-line detection method for solid particle content in liquid-carrying raw gas, which has high detection accuracy, and relates to the technical field of natural gas solid particle content measurement. The on-line sampling device for solid particle content in liquid-carrying raw gas comprises a separator and a sampling pipeline bypassing a main pipeline, the sampling pipeline comprises a cyclone generating pipeline section, a cyclone stabilizing pipeline section and a sampling pipeline section arranged in sequence along the flow direction of the raw gas, the cyclone generating pipeline section is provided with guide vanes for generating spiral flow of the raw gas passing through the cyclone generating pipeline section, the sampling pipeline section is provided with a liquid taking pipeline closely attached to the inner wall of the sampling pipeline section, and the liquid taking pipeline is connected with the separator. The application improves the accuracy of on-line measurement of the solid particle content in the raw gas while keeping low-cost sampling.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of natural gas solid particle content measurement, in particular to an online sampling device and detection method for solid particle content in liquid-carrying raw gas. BACKGROUND

[0002] At present, in the development of natural gas, especially shale gas and tight gas reservoirs, hydraulic consolidation solid particle fracturing method has been widely used. In the production of gas wells, the raw gas stream must contain a large amount of solid particles and liquid. Usually, solid particle removal equipment is set up in natural gas well stations and platforms to remove solid particles in raw gas, so as to ensure the safe and stable operation of downstream equipment and gathering pipelines. In the gathering process of high-sulfur natural gas, with the change of pressure, temperature and other conditions, elemental sulfur dissolved in the gas may precipitate in the form of solid particles in the gathering pipeline and migrate and deposit, which may cause "sulfur plugging" of the ground gathering pipeline, cause corrosion of steel, and ultimately affect the normal transportation of gas. Therefore, accurately detecting the solid particle content in liquid-carrying raw gas is particularly important for formulating safe and effective methods to prevent solid particle erosion, timely and effective "plugging" measures, evaluating the solid particle removal capacity of various solid particle removal separation equipment in actual production environment, and optimizing the operation system of the formed reasonable and stable gathering system.

[0003] In the existing solid particle content detection sampling technology, it can be generally divided into two kinds: one is to directly connect the raw gas main pipeline to the separator for complete separation sampling, and the other is to set a sampling pipe on the raw gas main pipeline for partial sampling detection. The first method needs to be matched with high-efficiency and stable complete separation device equipment, which has the disadvantages of large equipment and high cost, and is less used. The second method is to set a sampling pipe on the main pipeline, and the sampling pipe is connected with the separator. When sampling, the sampling pipe is branched from the main pipeline to obtain a certain amount of sampling gas and send it into the separator. The separator separates the solid phase in the sampling gas, measures the solid mass, compares it with the amount of sampling gas, and then the solid content in the gas is obtained. This method has the advantages of small equipment size and low cost, and is mainly suitable for gas without liquid. Since the gas, liquid and solid three phases in the solid particle-carrying liquid raw gas are mixed unevenly in the main pipeline, there is a certain difference between the composition proportion of the branched fluid sample (sampling gas) and the composition of the fluid in the main pipeline, that is, the sampling representativeness is not strong, which leads to poor detection accuracy. SUMMARY

[0004] The first technical problem to be solved by the present application is to provide an online sampling device for solid particle content in liquid-carrying raw gas, which has strong sampling representativeness and low cost and small size of separation equipment.

[0005] The second technical problem to be solved by the present application is to provide an online detection method for detecting the content of solid particles in liquid-carrying raw gas with high accuracy.

[0006] The technical scheme adopted by the present application to solve the technical problem is: an online sampling device for the content of solid particles in liquid-carrying raw gas, comprising a separator and a sampling pipeline bypassing a main pipeline, one end of the sampling pipeline is connected with the upstream of the main pipeline through a first valve, and the other end is connected with the downstream of the main pipeline through a second valve;

[0007] A third valve is arranged on the main pipeline, and the third valve is located between the first valve and the second valve.

[0008] The sampling pipeline comprises a cyclone generating pipe section, a cyclone stabilizing pipe section and a sampling pipe section arranged in sequence along the flow direction of the raw gas, the cyclone generating pipe section is provided with guide vanes for generating a spiral flow of the raw gas passing through the cyclone generating pipe section, the sampling pipe section is provided with a liquid taking pipe closely attached to the inner wall of the sampling pipe section, and the liquid taking pipe is connected with the separator.

[0009] Further, the sampling pipeline is arranged horizontally.

[0010] Further, the inlet of the liquid taking pipe is a fan ring, and the outer diameter of the inlet of the liquid taking pipe is the same as the inner diameter of the cyclone generating pipe section.

[0011] Further, the liquid taking pipe is a plurality of pipes, and the liquid taking pipes are uniformly distributed along the circumference of the sampling pipe section.

[0012] Further, the cyclone stabilizing pipe section is provided with a filter screen, the filter screen is installed in the cyclone stabilizing pipe section through support, and a spacing is arranged between the filter screen and the pipe wall of the cyclone stabilizing pipe section to form a liquid-solid phase channel.

[0013] Further, a plurality of guide plates for weakening the tangential velocity of the spiral flow are arranged in the liquid-solid phase channel, the guide plates divide the liquid-solid phase channel into a plurality of spiral liquid-solid phase channel units, and the spiral rise angles of the liquid-solid phase channel units are consistent.

[0014] Further, the distance between the pipe opening of the liquid taking pipe and the liquid-solid phase channel is less than or equal to 30mm.

[0015] Further, the gas outlet of the separator is communicated with the sampling pipeline through a fourth valve and a check valve in sequence.

[0016] Further, a pressure regulating valve is arranged on the sampling pipeline to facilitate the backflow of the gas flow from the gas outlet of the separator into the sampling pipeline.

[0017] The online detection method of the solid particle content of the liquid-carrying raw material gas adopts the online sampling device of the solid particle content of the liquid-carrying raw material gas, and the detection method comprises the following steps:

[0018] The third valve is closed to cut off the main pipeline, the first valve and the second valve are opened, the raw material gas in the main pipeline passes through the sampling pipeline, the raw material gas generates a spiral flow by means of the guide vanes during the passing through the sampling pipeline, and a liquid-solid phase mixed layer is formed on the inner wall of the sampling pipe section;

[0019] The liquid-solid phase sample is taken out from the liquid-solid phase mixed layer by the liquid taking pipe according to the sampling proportion coefficient k and the sampling time t and is sent into the separator, and the solid particles are separated out;

[0020] The mass of the solid particles is measured;

[0021] The solid particle content of the raw material gas is calculated according to the mass of the solid particles, the sampling proportion coefficient k, the sampling time t and the flow Q of the raw material gas.

[0022] The online sampling device and the detection method of the present application can make the raw material gas generate a spiral flow by means of the guide vanes, so that a liquid-solid phase mixed layer is formed on the inner wall of the sampling pipe section, a certain liquid-solid phase sample is taken out according to the sampling proportion by the liquid taking pipe and is sent into the separator, the solid particles are separated out, and finally the solid particle content of the raw material gas can be calculated by the mass of the solid particles. The present application adopts the phase separation of the raw material gas and then sampling, the sampling is representative, and only a small amount of liquid-solid phase sample is taken out to achieve the sampling purpose, the separation processing capacity requirement of the separation equipment is low, and therefore the present application improves the accuracy of the online measurement of the solid particle content of the raw material gas while maintaining the low-cost sampling. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a structural schematic view of the online sampling device of the present application;

[0024] Figure 2 is a structural schematic view of the sampling pipeline;

[0025] Figure 3 is Figure 1 is a sectional view along A-A;

[0026] Figure 4 is Figure 1 is a sectional view along A-A;

[0027] Figure 5 is Figure 1 is a sectional view along B-B;

[0028] Figure 6 is a comparison schematic view of the square-shaped inlet and the fan ring-shaped inlet of the liquid taking pipe;

[0029] The diagram shows: main pipe 1, sampling pipe 2, separator 4, first valve 5, second valve 6, fourth valve 7, check valve 8, pressure regulating valve 9, third valve 11, cyclone generation pipe section 21, cyclone stabilization pipe section 22, sampling pipe section 23, guide vane 211, filter screen 221, support 222, guide plate 224, liquid sampling pipe 231, liquid-solid phase mixing layer 232, centerline 233, and liquid-solid phase channel unit 2231. Detailed Implementation

[0030] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0031] like Figure 1 , Figure 2 As shown, the online sampling device for the content of solid particles in liquid-carrying raw material gas of the present invention includes a separator 4 and a sampling pipe 2 bypassed on the main pipeline 1. One end of the sampling pipe 2 is connected to the upstream of the main pipeline 1 through a first valve 5, and the other end is connected to the downstream of the main pipeline 1 through a second valve 6. A third valve 11 is provided on the main pipeline 1, and the third valve 11 is located between the first valve 5 and the second valve 6. The sampling pipe 2 includes a swirl generation pipe section 21, a swirl stabilization pipe section 22, and a sampling pipe section 23 arranged sequentially along the direction of the raw material gas flow. The swirl generation pipe section 21 is provided with guide vanes 211 that generate a spiral flow in the raw material gas passing through the swirl generation pipe section 21. The guide vanes 211 cause the raw material gas to flow forward in a spiral shape. Under the centrifugal action of the spiral flow, the heavier solid particles and liquid in the raw material gas flow to the periphery, thereby forming a liquid-solid mixed layer 232 (annular flow composed of solid particles and liquid) on the inner wall of the sampling pipe 2. The sampling tube section 23 is provided with a liquid collection tube 231 that is closely attached to the inner wall of the sampling tube section 23, and the liquid collection tube 231 is connected to the separator 4.

[0032] When the device is sampling, the third valve 11 on the main pipeline is closed, and the first valve 5 and the second valve 6 are opened, so that the raw material gas passes through the sampling pipeline 2 entirely. When the raw material gas passes through the cyclone generating pipe section 21, the spiral flow is generated under the action of the guide vanes 211, and the spiral flow flows forward. Under the centrifugal action of the spiral flow, the relatively heavy solid particles and liquid in the raw material gas flow to the periphery, so that the liquid-solid phase mixed layer 232 (annular flow composed of solid particles and liquid) is formed on the inner wall of the sampling pipeline 2. When the spiral flow leaves the guide vanes 211, the spiral flow is affected by the wake of the guide vanes 211, and is in an unstable state within a certain distance, which causes the liquid-solid phase mixed layer 232 to be unstable. If the liquid-solid phase mixed layer is sampled at this time, the detection accuracy will be affected. Therefore, the cyclone stabilizing pipe section 22 with a certain length is arranged between the sampling pipe section 23 and the cyclone generating pipe section 21 to gradually stabilize the spiral flow. After the spiral flow is stabilized, the stable liquid-solid phase mixed layer 232 is formed on the inner wall of the sampling pipe section 23, and there is almost no solid particle in the middle gas phase. Therefore, it can be considered that only a stable proportion of the sample in the liquid-solid phase mixed layer 232 is sampled and taken out through the liquid taking pipe 231, and then the mass of the solid particles in the sample is measured. According to the separation proportion, the mass of the solid particles is compared with the amount of the sampled gas, so that the content of the solid particles in the gas can be obtained more accurately. That is, a certain proportion of the sample in the liquid-solid phase mixed layer 232 is taken out through the liquid taking pipe 231 and sent into the separator 4 to separate the solid particles, the mass of the solid particles is measured, and then the mass of the solid particles is compared with the amount of the sampled gas according to the separation proportion, so that the content of the solid particles in the gas can be obtained. The device adopts the method of sampling after separating the raw material gas, and the sampling representativeness is stronger. In addition, only a small amount of liquid-solid phase mixture needs to be taken out to achieve the purpose of strong sampling representativeness. The requirement for the separation and processing capacity of the separator is low, the volume of the separation equipment is small, and the cost is low. When sampling is not needed, the first valve 5 and the second valve 6 are closed, and the third valve 11 is opened. It can be understood that the direction of the pipe opening of the liquid taking pipe 231 should be opposite to the flow direction of the liquid-solid phase mixed layer 232, so as to take the solid particles.

[0033] In the formula, the specific length of the cyclone stabilizing pipe section 22 can be obtained through experiments according to actual conditions; the specific setting mode of the guide vanes 211 is the same as that of the vanes of the cyclone generator, such as the patent CN200910022760.1. Of course, the cyclone generating pipe section 21 can also be formed by directly installing the cyclone generator on the sampling pipeline 2.

[0034] The sampling pipeline 2 can be arranged horizontally, vertically upward or vertically downward. When the sampling pipeline 2 is arranged vertically upward, backflow is easy to occur in the sampling pipeline 2, which affects the stability of the liquid-solid phase mixed layer 232. When the sampling pipeline 2 is arranged vertically downward, the liquid-solid phase mixed layer 232 is greatly affected by gravity. Therefore, the sampling pipeline 2 is preferably arranged horizontally.

[0035] The radial height h of the inlet of the liquid sampling tube 231 in the sampling tube section 23 should be greater than or equal to the thickness of the liquid-solid mixture layer 232. There can be one or more liquid sampling tubes 231, preferably multiple tubes, evenly distributed circumferentially along the sampling tube section 23. This makes the sampling more representative and can further improve the accuracy of the detection. In this embodiment of the invention, there are four liquid sampling tubes 231.

[0036] The proportion of solid particles extracted from the liquid-solid mixture layer 232 by the sampling tube 231, i.e., the sampling ratio coefficient, is equal to the ratio of the effective solid particle area of ​​the sampling tube 231 opening to the cross-sectional area of ​​the liquid-solid mixture layer 232. The effective solid particle area of ​​the sampling tube 231 opening is the area of ​​the sampling tube 231 opening extending into the liquid-solid mixture layer 232. Figure 5 (The black shadow area in the image).

[0037] The inlet of the sampling tube can be of various shapes, such as circular, square, trapezoidal, or fan-shaped. Due to centrifugation, the solid particles in the liquid-solid mixture 232 are unevenly distributed in the radial direction of the sampling tube section 23, with more solid particles on the outer side and fewer on the inner side. Figure 6 As shown, comparing the inlet of the liquid sampling tube 231 being a fan-shaped annular shape with a square inlet (dashed line portion), it can be seen that the sampling area (proportion) gradually increases radially inward along the sampling tube segment 23 in the square shape. With the centerline 233 of the inlet of the liquid sampling tube 231 as the center, this effectively increases the sampling proportion inside the centerline 233 and decreases the sampling proportion outside the centerline 233. This results in the inability to proportionally sample the liquid-solid mixture layer 232 in the radial direction of the sampling tube segment, which affects the representativeness of the sampling and leads to a lower measured solid particulate matter content than the actual solid particulate matter content. The same problem exists with circular or trapezoidal structures for the liquid sampling tube. Therefore, to further improve the representativeness of the sampling, preferably, the inlet of the liquid sampling tube 231 is a fan-shaped annular shape, and the outer diameter of the inlet (fan-shaped annular shape) of the liquid sampling tube 231 is the same as the inner diameter of the swirl generation tube segment 21. This solves the problem that the liquid-solid mixture layer 232 cannot be sampled proportionally in the radial direction of the sampling tube section.

[0038] The specific calculation process for the solid particulate matter content in the raw gas: Assuming there is one sampling pipe 231, and the central angle α of the inlet (fan-shaped annular) of sampling pipe 231 is 6°, then the sampling ratio coefficient K = 1 / 60. The mass of solid particulate matter separated by the separation equipment is measured as M, the sampling time is time t, and the flow rate of the raw gas is Q (which can be measured by a flow meter on the main pipeline). Therefore, the solid particulate matter content S in the raw gas is:

[0039] A small amount of liquid droplets will be entrained in the central gas phase fluid of the spiral flow. To further ensure that the liquid phase in the raw material gas flows along the pipe wall, thereby improving the representative effect of the sampling, in the present application, a filter screen 221 is arranged in the cyclone stabilizing pipe section 22 to capture the liquid droplets in the gas phase fluid. Specifically, the filter screen 221 is installed in the cyclone stabilizing pipe section 22 through a support 222, and a space is arranged between the filter screen 221 and the pipe wall of the cyclone stabilizing pipe section 22 to form a liquid-solid phase passage 223 for the liquid-solid phase mixed layer to pass through, so as to prevent the filter screen from affecting the flow of the liquid-solid phase mixed layer 232. The height of the liquid-solid phase passage 223 should be greater than the thickness of the liquid-solid phase mixed layer.

[0040] To centrifugally separate the solid particles in the raw material gas at the pipe wall, the tangential velocity (circumferential motion velocity) of the spiral flow passing through the guide vane is large. If the tangential velocity of the fluid is not reduced, the fluid will have a large impact on the protruding part of the liquid taking pipe, which will have a large adverse effect on the stability of the pipe flow and will reduce the representativeness of the sampling. To further improve the sampling representativeness, therefore, a plurality of guide plates 224 for weakening the tangential velocity of the spiral flow are arranged in the liquid-solid phase passage 223. The guide plates 224 are arranged in a spiral shape in the liquid-solid phase passage 223, dividing the liquid-solid phase passage 223 into a plurality of spiral liquid-solid phase passage units 2231, and the spiral rise angles of the liquid-solid phase passage units 2231 are consistent. The guide plates 224 have a guide effect, and the spiral rise angle thereof can be obtained through experiments. The specific number of the guide plates 224 can be any number greater than or equal to 2. In the present application, the guide plates 224 are also used as supports 222 of the filter screen 221. After the liquid-solid phase mixed layer 232 passes through the liquid-solid phase passage 223, its stability will decrease with the increase of the distance from the liquid-solid phase passage 223. If the distance between the pipe opening of the liquid taking pipe 231 and the liquid-solid phase passage 223 is too large, it will affect the sampling representativeness. Therefore, in the present application, the distance between the pipe opening of the liquid taking pipe 231 and the guide plates 224 should be as small as possible, specifically, less than or equal to 30 mm.

[0041] The separator 4 adopts an existing separator, such as a gravity separation device, a centrifugal separator, etc. During sampling, a part of the gas will flow out of the liquid taking pipe 231 and enter the liquid taking pipe 231, which will cause environmental pollution if directly discharged. To prevent environmental pollution, in the figure, the gas outlet of the separator 4 is communicated with the sampling pipeline 2 through the fourth valve 7 and the one-way valve 8 in sequence. The one-way valve 8 prevents the gas in the sampling pipeline 2 from flowing back to the separator 4. When it is necessary to discharge the gas, the fourth valve 7 is opened, and the gas flow in the separator 4 can be returned to the sampling pipeline 2.

[0042] The sampling pipeline 2 of the present application is provided with a pressure regulating valve 9 for facilitating the backflow of the gas outlet of the separator 4 into the sampling pipeline 2. The pressure regulating valve 9 is arranged downstream of the liquid taking pipeline 231, and ensures that there is a certain pressure difference between the inlet end of the liquid taking pipeline 231 and the gas outlet end of the separator 4, thereby facilitating the backflow of the gas escaping from the liquid taking pipeline 231.

[0043] The present application also provides an online detection method for the solid particle content of the liquid-carrying raw material gas. The method uses the above-mentioned online sampling device, and the detection method comprises the following steps:

[0044] Step one: close the third valve 11 to cut off the main pipeline 1, open the first valve 5 and the second valve 6, and make the raw material gas in the main pipeline 1 pass through the sampling pipeline 2. The raw material gas generates a spiral flow by means of the guide vanes 211 during the passing process, and forms a liquid-solid phase mixed layer 232 on the inner wall of the sampling pipeline section 23;

[0045] Step two: use the liquid taking pipeline 231 to take out a liquid-solid phase sample from the liquid-solid phase mixed layer 232 according to the sampling ratio k and the sampling time t, and send the sample into the separator 4 to separate out the solid particles;

[0046] Step three: measure the mass M of the solid particles;

[0047] Step four: calculate the solid particle content S of the raw material gas according to the mass of the solid particles, the sampling ratio k, the sampling time t, and the flow rate Q of the raw material gas, wherein Q can be measured by a flow meter on the main pipeline.

[0048] The sampling ratio coefficient is equal to the ratio of the effective solid particle taking area of the nozzle of the liquid taking pipeline 231 to the cross-sectional area of the liquid-solid phase mixed layer 232. The effective solid particle taking area of the nozzle of the liquid taking pipeline 231 is the area of the nozzle of the liquid taking pipeline 231 extending into the liquid-solid phase mixed layer 232.

[0049] The method cuts off the main pipeline, makes the raw material gas pass through the sampling pipeline 2, generates a spiral flow of the raw material gas during the passing process of the guide vanes 211, forms a liquid-solid phase mixed layer 232 on the inner wall of the sampling pipeline section 23, takes out a certain liquid-solid phase sample into the separator 4 according to the sampling ratio k through the liquid taking pipeline 231, separates out the solid particles, and finally calculates the solid particle content in the raw material gas by the mass of the solid particles. The method uses sampling after phase separation of the raw material gas, has strong representativeness, and only needs to take out a small amount of liquid-solid phase sample to achieve the sampling purpose. The method has low requirement for the separation processing capacity of the separation equipment, and therefore, the method improves the accuracy of the online measurement of the solid particle content of the raw material gas while maintaining low-cost sampling.

Claims

1. An online sampling device for the content of solid particulate matter in liquid-carrying feed gas, characterized in that: It includes a separator (4) and a sampling pipe (2) that is bypassed on the main pipe (1). One end of the sampling pipe (2) is connected to the upstream of the main pipe (1) through a first valve (5), and the other end is connected to the downstream of the main pipe (1) through a second valve (6). The main pipeline (1) is provided with a third valve (11), which is located between the first valve (5) and the second valve (6); The sampling pipe (2) includes a swirl generation pipe section (21), a swirl stabilization pipe section (22), and a sampling pipe section (23) arranged sequentially along the direction of the raw material gas flow. The swirl generation pipe section (21) is provided with guide vanes (211) that generate a spiral flow in the raw material gas passing through the swirl generation pipe section (21). The sampling pipe section (23) is provided with a liquid sampling pipe (231) that is closely attached to the inner wall of the sampling pipe section (23). The liquid sampling pipe (231) is connected to the separator (4).

2. The online sampling device for the content of solid particulate matter in liquid-carrying raw gas as described in claim 1, characterized in that: The sampling pipe (2) is set horizontally.

3. The online sampling device for the content of solid particulate matter in liquid-carrying raw gas as described in claim 1, characterized in that: The inlet of the liquid collection tube (231) is a fan-shaped ring, and the outer diameter of the inlet of the liquid collection tube (231) is the same as the inner diameter of the vortex generating tube section (21).

4. The online sampling device for the content of solid particulate matter in liquid-carrying raw gas as described in claim 1, 2, or 3, characterized in that: There are multiple liquid collection tubes (231), and the liquid collection tubes (231) are evenly distributed along the circumference of the sampling tube section (23).

5. The online sampling device for the content of solid particulate matter in liquid-carrying raw gas as described in claim 1, characterized in that: The swirling stabilizer section (22) is provided with a filter screen (221), which is installed in the swirling stabilizer section (22) by a support (222). There is a gap between the filter screen (221) and the pipe wall of the swirling stabilizer section (22) to form a liquid-solid phase channel (223).

6. The online sampling device for the content of solid particulate matter in liquid-carrying raw material gas as described in claim 5, characterized in that: The liquid-solid phase channel (223) is provided with multiple guide plates (224) for reducing the tangential velocity of the spiral flow. The guide plates (224) divide the liquid-solid phase channel (223) into multiple spiral liquid-solid phase channel units (2231), and the spiral angles of the liquid-solid phase channel units (2231) are consistent.

7. The online sampling device for the content of solid particulate matter in liquid-carrying raw material gas as described in claim 6, characterized in that: The distance between the opening of the liquid collection tube (231) and the liquid-solid phase channel (223) is less than or equal to 30 mm.

8. The online sampling device for the content of solid particulate matter in liquid-carrying raw material gas as described in claim 1, characterized in that: The outlet of the separator (4) is connected to the sampling pipeline (2) after passing through the fourth valve (7) and the one-way valve (8) in sequence.

9. The online sampling device for the content of solid particulate matter in liquid-carrying raw gas as described in claim 8, characterized in that: The sampling pipe (2) is equipped with a pressure regulating valve (9) to facilitate the return flow of air from the outlet of the separator (4) into the sampling pipe (2).

10. An online detection method for the content of solid particulate matter in liquid-carrying feed gas, characterized in that: The detection method using the online sampling device for solid particulate matter content in liquid-carrying feed gas as described in any one of claims 1 to 9 includes: Close the third valve (11), cut off the main pipeline (1), open the first valve (5) and the second valve (6) so that the raw material gas in the main pipeline (1) passes through the sampling pipeline (2). During the process of the raw material gas passing through the sampling pipeline (2), a spiral flow is generated by the guide vane (211), and a liquid-solid phase mixed layer (232) is formed on the inner wall of the sampling pipe section (23). Using the sampling tube (231), a liquid-solid phase sample is taken from the liquid-solid phase mixture (232) according to the sampling ratio coefficient k and the sampling time t and sent into the separator (4) to separate solid particles; The mass of the solid particles was measured. The solid particulate matter content of the feed gas is calculated based on the mass of solid particulate matter, the sampling ratio coefficient K, the sampling time t, and the flow rate Q of the feed gas.

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