A uniformity testing system and method based on stacked bed structure

Abstract

A uniformity testing system and method based on a stacked bed structure, the system mainly consists of a porous medium stacked bed device, a water supply device, an air supply device, a smoke device, a data acquisition system and other equipment. The present invention introduces nitrogen into the porous medium stacked bed structure through the air supply system to determine the concentration difference at different locations in the same horizontal plane, thereby determining the concentration coefficient; using the water supply system to add a certain amount of water therein, determine the water flow time, and determine the time coefficient; using the smoke device, introduce two different colors of smoke into the burner, and extract red and green pixels by photographing the smoke mixing at the outlet with a camera to determine its mixing coefficient; the concentration coefficient, time coefficient, and mixing coefficient determined by the three methods are combined to calculate its non-uniformity; thereby meeting the efficient combustion of the porous medium stacked bed structure and achieving low carbon emissions. The system and method are simple, easy to operate, and have good use effects.

Description

Technical Field

[0001] The invention belongs to the field of porous medium packed beds, and in particular relates to a uniformity testing system and method based on a packed bed structure. Background Art

[0002] The porous medium burner is a new type of burner, which is now more and more widely used in the engineering field. Compared with traditional burners, the porous medium burner has the advantages of better heat storage capacity, wide combustion limit, high combustion efficiency, uniform temperature distribution, and low pollutant emission efficiency. The porous medium burner fully utilizes the heat generated by combustion through heat conduction and radiation heat exchange. It can effectively transfer the heat generated by the combustion of the premixed gas in the upstream zone from the downstream zone to the upstream zone through radiation heat exchange and convection heat conduction to heat the gas, thereby making full use of the heat generated by its combustion. In addition, the porous medium burner helps to broaden the combustion limit, stabilize flame combustion, reduce pollutant emissions, and achieve low-carbon combustion.

[0003] The combustion temperature in the integral porous media burner is low, the pollutant emissions are large, the fuel cannot be fully utilized and low-carbon combustion cannot be achieved, causing a large amount of environmental pollution and energy waste; therefore, the stacked bed structure in the porous media burner has received more and more attention. The porous media stacked bed structure can change with the shape of the porous media burner, and the stacked bed structure has good heat storage capacity and can achieve high-temperature combustion. The maximum temperature can reach 1300°C, which can make full use of the fuel, and the higher temperature can reduce pollutant emissions and achieve low-carbon combustion.

[0004] Since there are many types of porous media stacked bed carriers, including A2O3 beads, ZrO2 beads, bird's nest proppants, etc., their common characteristics are that the stacked bed particles are small, the arrangement methods are varied, and the uniformity of the arrangement is different for the column structure. Summary of the invention

[0005] In view of the problems existing in the technical background, the present invention adopts a nitrogen supply device to introduce nitrogen into two porous medium packed beds, calculates the concentration difference in the two packed beds at the same point, and determines its non-uniformity. A water supply pump is used to introduce the same amount of water flow into the two porous medium packed beds, calculates the difference in the water flow time, and determines its non-uniformity.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A uniformity testing system based on a stacked bed structure, characterized in that it comprises a porous medium stacked bed structure, and an air supply device, a water supply system, and a smoke system respectively connected to the porous medium stacked bed structure; wherein the porous medium stacked bed structure comprises an inner cylinder, and a separated uniform porous medium stacked bed and a porous medium stacked bed to be tested are arranged on the upper part of the inner cylinder, wherein the air supply device respectively introduces nitrogen into the bottom of the uniform porous medium stacked bed and the porous medium stacked bed to be tested, and a gas analysis and detection device is connected above the uniform porous medium stacked bed and the porous medium stacked bed to be tested, and the gas analysis and detection device respectively detects the nitrogen concentration difference at different positions passing through the porous medium stacked bed and the porous medium stacked bed to be tested;

[0008] The water supply system respectively introduces flowing water into the uniform porous medium packed bed and the porous medium packed bed to be tested, records the time of passing through the two porous medium packed beds, and calculates the time difference between the two;

[0009] The smoke system allows red smoke and green smoke to enter the uniform porous medium piled bed and the porous medium piled bed to be tested at the same pressure. When the mixed smoke is discharged, a camera is used to take pictures of the outlet positions corresponding to the red smoke bottle and the green smoke bottle of the uniform porous medium and the porous medium to be tested.

[0010] Furthermore, the gas analysis and detection device includes a plurality of groups of gas collection tubes arranged at the same spacing in the horizontal plane at the center position of the uniform porous medium accumulation bed and the porous medium accumulation bed to be tested, the upper pipe mouth of the gas collection tube is connected to the vacuum pump, the left end of the vacuum pump is connected to the gas collection bag, the left end of the gas collection bag is provided with a data analysis system, the data analysis system includes a gas analyzer, and the left end of the gas analyzer is connected to a computer.

[0011] Furthermore, the gas supply device includes an air inlet pipe connected to the porous medium stacked bed structure, and a gas mass flow meter. The upper and lower ports of the gas mass flow meter are connected to the air inlet pipe, and its left port is connected to the pressure reducing valve. A nitrogen bottle is provided at the left end of the pressure reducing valve, and the nitrogen bottle is connected to the nitrogen booster through the air inlet pipe.

[0012] Furthermore, the water supply system includes a water treatment device, which is connected to the water tank through a drain pipe via a water pump. A water supply pump is provided at the left end of the water tank, and the water supply pump is connected to the drain pipe via a water pressure sensor. The water supply system also includes a screw blower and a generator.

[0013] Furthermore, the smoke system includes a red smoke bottle and a green smoke bottle, the upper ports of the red smoke bottle and the green smoke bottle are respectively connected to smoke inlet pipes, and the smoke inlet pipes are respectively provided with pressure valves and pressure gauges to ensure that the red and green smoke flows are the same, and the smoke system also includes a camera.

[0014] Furthermore, the porous medium stacked bed structure is a bird's nest proppant or other columnar porous media.

[0015] Furthermore, the gas collection bags are multiple gas collection bags of the same model, which are respectively connected to multiple different gas collection pipes, and the gas concentrations thereof are detected in turn by a gas analyzer.

[0016] Furthermore, the water pressure sensor is a 0-1.5MPa water supply pressure sensor.

[0017] Furthermore, the screw blower is a single-screw blower or a twin-screw blower.

[0018] The present invention also provides a method for testing a uniformity system based on a stacked bed structure, characterized in that it comprises the following steps:

[0019] S1: Under the action of the water supply pump, the water that has been freed of impurities in the water treatment device is pumped out and transmitted to the water storage tank through the drainage pipe. Then, the water in the water storage tank is pumped out by the water pump through the water pressure sensor, and the water is sprayed into the two porous medium stacking beds respectively;

[0020] S2: Use a computer to record the time it takes for water to flow through two porous media beds, and calculate the time difference Δt between the two, which is the time coefficient;

[0021] S3: Turn off the water pump, turn on the generator and the screw blower, and introduce air into the two porous medium stacked beds to dry the stacked bed particles in preparation for the next step;

[0022] S4: Turn on the nitrogen booster, adjust the pressure reducing valve, pump nitrogen into the nitrogen bottle, and adjust the mass flow meter so that a fixed amount of nitrogen is pumped into the two porous medium stacked beds respectively;

[0023] S5: Turn on the vacuum pump to extract nitrogen from six locations in the central layer of the two porous media stacked beds respectively, and use the gas analyzer to detect the nitrogen concentration at multiple locations, and calculate the concentration difference Δc1, Δc2, Δc3, ... Δc at the same location of the two porous media stacked bed structures. n , calculate the average concentration difference Δc=(Δc1+Δc2+Δc3+……Δc n ) / n, n is the number of gas collection tubes, Δc is the concentration coefficient;

[0024] S6: Turn off the vacuum pump and the nitrogen booster, turn on the generator and the screw blower, and introduce air into the two porous medium stacked beds to prepare for the next step;

[0025] S7: Open the red smoke bottle and the green smoke bottle at the same time, adjust the pressure valve, and allow the red smoke and the green smoke to enter the two porous medium stacking beds at the same pressure. When the mixed smoke is discharged, use a camera to take pictures of the outlet positions of the red smoke bottle and the green smoke bottle corresponding to the uniform porous medium and the porous medium to be tested, respectively, and record them as photo 1, photo 2, photo 3, and photo 4;

[0026] S8: close the red smoke bottle and the green smoke bottle, turn on the generator and the screw blower, and introduce air into the two porous medium packed beds to clean the porous medium packed beds;

[0027] S9: Extract the number of green area pixels of photos 1 and 3, and calculate the ratio of their occupation to the total pigment photos of photos 1 and 3, respectively, denoted as k1 and k3. At the same time, extract the number of red area pixels of photos 2 and 4, and calculate the ratio of their occupation to the total pigment photos of photos 2 and 4, denoted as k2 and k4, k=[(k3-k1)+(k4-k2) / 2, k is the smoke mixing coefficient.

[0028] S10: According to the above steps, the experimental critical acceptable non-uniformity device is tested to determine its time coefficient Δt0, concentration coefficient Δc0, mixing coefficient k0, and the non-uniformity coefficient is calculated;

[0029] S11: Arrange the data, determine the time coefficient Δt, concentration coefficient Δc, and smoke coefficient k of the above method, substitute them into the non-uniformity coefficient formula, and compare them with the acceptable non-uniformity u0 of the experiment conducted in advance. If u>u0, the device is determined to be non-uniform.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] 1. Use gas concentration measurement system, water supply system and smoke system to determine time coefficient, concentration coefficient and mixing coefficient, quantitatively calculate the unevenness of porous medium stacking bed, standardize the arrangement of porous medium stacking bed when using it, and realize faster and more uniform gas passing through porous medium stacking bed;

[0032] 2. By determining the three coefficients, the unevenness of the porous media bed can be judged more comprehensively and accurately, which can better realize the energy recovery and utilization in the porous media combustion process, reduce the emission of pollutants, and achieve more efficient combustion; BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0034] In the figure, 1-inner cylinder, 2-uniform porous medium stacking bed, 3-porous medium stacking bed to be tested, 4-pressure valve, 5-pressure gauge, 6-smoke inlet pipe, 7-red smoke bottle, 8-green smoke bottle, 9-vacuum pump, 10-gas collection pipe, 11-nitrogen booster, 12-nitrogen bottle, 13-pressure reducing valve, 14-mass flow meter, 15-inlet pipe, 16-gas collection bag, 17-gas analyzer, 18-computer, 19-water treatment device, 20-water pump, 21-water storage tank, 22-water pressure sensor, 23-drain pipe, 24-water spray pipe, 25-generator, 26-screw blower, 27-air inlet pipe, 28-camera. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the 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, many other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] It should be noted that the experimental methods described in the following embodiments are conventional methods unless otherwise specified, and the reagents and materials are commercially available unless otherwise specified; in the description of the present invention, the terms "lateral", "longitudinal", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate directions or positional relationships, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0037] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0038] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "setting",

[0039] "Installation", "connection" 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 mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0040] The present invention will be further described below in conjunction with the accompanying drawings and embodiments. As shown in the figure, the present invention provides a uniformity testing system based on a stacked bed structure, including a porous medium stacked bed structure, and a gas supply device and a water supply system respectively connected to the porous medium stacked bed structure; wherein: the porous medium stacked bed structure includes an inner tube 1, a uniform porous medium stacked bed 2 and a porous medium stacked bed 3 to be tested are provided on the upper part of the inner tube 1, three gas collection pipes 10 with the same spacing are respectively arranged in the horizontal plane at the center position of the uniform porous medium stacked bed 2 and the porous medium stacked bed 3 to be tested, the upper pipe mouth of the gas collection pipe is connected to an air pump 9, the left end of the air pump 9 is connected to a gas collection bag 16, and a data analysis system is provided at the left end of the gas collection bag, the data analysis system mainly includes a gas analyzer 17, and the left end of the gas analyzer is connected to a computer 18. The air supply device includes an air inlet pipe 15 connected to the porous medium stacked bed structure, the upper and lower ports of the gas mass flow meter 14 are connected to the air inlet pipe 15, and the left port thereof is connected to the pressure reducing valve 13, a nitrogen bottle 12 is provided at the left end of the pressure reducing valve 13, and the nitrogen bottle 12 is connected to the nitrogen booster 11 through the air inlet pipe 15; the water supply system includes a water treatment device 19, the water treatment device 19 is connected to the water storage tank 21 through a water pump 20 through a drain pipe 23, a water supply pump is provided at the left end of the water storage tank 21, and the water supply pump is connected to the drain pipe 23 through a water pressure sensor 22, in addition, the water supply system also includes a screw blower 26 and a generator 25; the smoke system mainly includes a red smoke bottle 7 and a green smoke bottle 8, the upper ports of the red smoke bottle 7 and the green smoke bottle 8 are respectively connected to the smoke inlet pipe 6, and the smoke inlet pipe 6 is respectively provided with a pressure valve 4 and a pressure gauge 5 to ensure that the red and green smoke flows are the same.

[0041] The porous medium accumulation bed is terminated with a water supply system, wherein: under the action of the water supply pump 20, the water that has been freed of impurities in the water treatment device 19 is pumped out and transmitted to the water storage tank 13 through the drain pipe 23, and then the water in the water storage tank is pumped out by the water pump through the 0-1.5MPa water pressure sensor 22, and then the water is sprayed into the two porous medium accumulation beds 2 and 3; a computer 18 is used to record the time for the water flow to pass through the two porous medium accumulation beds respectively, and the time difference Δt between the two is calculated, which is the time coefficient.

[0042] The lower end of the porous medium stacked bed is connected to the gas supply system, wherein: the nitrogen booster 11 is turned on, the pressure reducing valve 13 is adjusted, the nitrogen is pumped into the nitrogen bottle 12, and the mass flow meter 14 is adjusted so that a fixed amount of nitrogen is pumped into the two porous medium stacked beds 2 and 3 respectively; the vacuum pump 9 is turned on, the nitrogen at six points in the central layer of the porous medium stacked bed is extracted respectively, and the nitrogen concentration at the six points is detected by the gas analyzer 17, and the concentration difference Δc1, Δc2, Δc3 at the same point of the two porous medium stacked bed structures is calculated, and the average value of the concentration difference Δc=(Δc1+Δc2+Δc3) / 3 is calculated, where Δc is the concentration coefficient;

[0043] A smoke system is provided at the lower end of the porous medium stacking bed, in which the red smoke bottle and the green smoke bottle are opened, and the pressure valve is adjusted to allow the red smoke and the green smoke to enter the two porous medium stacking beds at the same pressure. When the mixed smoke is discharged, a camera is used to take pictures of the outlet positions corresponding to the red smoke bottle and the green smoke bottle of the uniform porous medium and the porous medium to be tested, respectively, and the pictures are recorded as photo 1, photo 2, photo 3, and photo 4, respectively; by extracting the red and green pixels of the photos respectively, their proportions are calculated, and the smoke mixing coefficient k is obtained;

[0044] The porous medium packed bed structures 2 and 3 in this example are bird's nest proppants or other columnar porous media;

[0045] The porous medium packed bed 2 in this example is a porous medium packed bed structure with completely uniform arrangement, and the porous medium packed bed 3 is a porous medium packed bed structure to be tested;

[0046] The uniformity test method of the stacked bed structure of the present invention is as follows:

[0047] Step S1: Under the action of the water supply pump 20, the water that has been freed of impurities in the water treatment device 19 is pumped out and transmitted to the water storage tank 21 through the drain pipe 23. Then, the water pump pumps the water in the water storage tank through the water pressure sensor 22, and the water is sprayed into the two porous medium stacking beds 2 and 3 respectively;

[0048] Step S2 uses a computer 18 to record the time for the water flow to pass through the two porous medium packed beds 2 and 3 respectively, and calculates the time difference Δt between the two, which is the time coefficient;

[0049] Step S3: turn off the water pump 20, turn on the generator 25 and the screw blower 26, and introduce air into the porous medium stacked beds 2 and 3 to dry the stacked bed particles in preparation for the next step;

[0050] Step S4: Open the nitrogen booster 11, adjust the pressure reducing valve 13, pump nitrogen into the nitrogen bottle 12, and adjust the mass flow meter 14 so that a fixed amount of nitrogen is pumped into the two porous medium stacked beds 2 and 3 respectively;

[0051] Step S5: Turn on the vacuum pump 9, extract nitrogen from six locations in the central layer of the porous medium stacked beds 2 and 3 respectively, and detect the nitrogen concentrations at the six locations through the gas analyzer 17, calculate the concentration differences Δc1, Δc2, Δc3 at the same locations of the two porous medium stacked bed structures 2 and 3, and calculate the average value of the concentration differences Δc=(Δc1+Δc2+Δc3) / 3, where Δc is the concentration coefficient;

[0052] Step S6: turn off the vacuum pump 9 and the nitrogen booster 11, turn on the generator 25 and the screw blower 26, and introduce air into the porous medium stacked beds 2 and 3 to prepare for the next step.

[0053] Step S7: Open the red smoke bottle and the green smoke bottle, adjust the pressure valve, and allow the red smoke and the green smoke to enter the two porous medium stacking beds at the same pressure. When the mixed smoke is discharged, use a camera to take pictures of the outlet positions of the red smoke bottle and the green smoke bottle corresponding to the uniform porous medium and the porous medium to be tested, respectively, and record them as Photo 1, Photo 2, Photo 3, and Photo 4;

[0054] Step S8: close the red smoke bottle 7 and the green smoke bottle 8, turn on the generator 25 and the screw blower 26, and introduce air into the porous medium stacked beds 2 and 3 to clean the porous medium stacked beds 2 and 3;

[0055] Step S9 extracts the number of green area pixels of photos 1 and 3, and calculates the ratio of the green area pixels to the total pigment photos of photos 1 and 3, respectively, which are recorded as k1 and k3. At the same time, the number of red area pixels of photos 2 and 4 is extracted, and the ratio of the red area pixels to the total pigment photos of photos 2 and 4 is calculated, which are recorded as k2 and k4, where k = [(k3-k1)+(k4-k2) / 2, where k is the smoke mixing coefficient;

[0056] Step S10: Experiment the critical acceptable non-uniformity device according to the above steps to determine its time coefficient Δt0, concentration coefficient Δc0, mixing coefficient k0, and calculate the non-uniformity coefficient u0 = Δt0·Δc0·k0;

[0057] Step S11: sort out the data, determine the time coefficient Δt, concentration coefficient Δc, and smoke coefficient s of the above method, substitute them into the non-uniformity coefficient formula u=Δt·Δc·k, and compare them with the acceptable non-uniformity u0 of the experiment in advance. If u>u0, the device is judged to be non-uniform;

[0058] Working principle of the present invention: when the whole system starts to work, under the action of water supply pump 20, the water that removes impurities in water treatment device 19 is pumped out, and transmitted to water storage tank 21 through drainage pipe 23, and then water in water storage tank 21 is pumped out by water pump 20 through water pressure sensor 22, and water is sprayed into two porous medium stacked beds 2 and 3 respectively; computer 18 is used to record the time when water flows through two porous medium stacked beds 2 and 3 respectively, and the time difference Δt between the two is calculated to determine the time coefficient; nitrogen booster 11 is turned on, pressure reducing valve 13 is adjusted, nitrogen is pumped into nitrogen bottle 12, and mass flow meter 14 is adjusted so that a fixed amount of nitrogen is pumped into two porous medium stacked beds 2 and 3 respectively; vacuum pump 9 is turned on, nitrogen is extracted from six points in the central layer of porous medium stacked bed respectively, and nitrogen concentration at six points is detected by gas analyzer 17, and concentration difference Δc1, Δc2, Δc3 at the same points of two porous medium stacked bed structures 2 and 3 is calculated, and the average value Δc of concentration difference is calculated, where Δc is the concentration degree coefficient; open the red smoke bottle 7 and the green smoke bottle 8, adjust the pressure valve 4, and read the pressure gauge 5 to ensure that the red smoke and the green smoke enter the porous medium packed beds 2 and 3 at the same time under the same pressure, use a camera to take pictures of the outlet positions corresponding to the red smoke bottle and the green smoke bottle of the uniform porous medium and the porous medium to be tested, respectively, and record them as photos 1, 2, 3, and 4, respectively, extract the number of green area pixels of photos 1 and 3, and calculate the ratio of the total pigment photos of photos 1 and 3, respectively, and record them as k1 and k3, and extract the number of red area pixels of photos 2 and 4, and calculate the ratio of the total pigment photos of photos 2 and 4, and record them as k2 and k4, and substitute them into the formula k=[(k3-k1)+(k4-k2) / 2 to determine the mixing coefficient k; substitute the determined time coefficient Δt, concentration coefficient Δc, and mixing coefficient k into the formula u=Δt·Δc·k to calculate the unevenness, and compare it with the experimental critical acceptable unevenness u0 to determine the unevenness of the porous medium packed bed 3;

[0059] The above embodiments are only used to illustrate and explain the present invention, and are not intended to limit the present invention to the scope of the described embodiments. In addition, it can be understood by those skilled in the art that the present invention is not limited to the above embodiments, and more variations and modifications can be made according to the teachings of the present invention, and these variations and modifications all fall within the scope of the protection claimed by the present invention.

Claims

1. A uniformity testing system based on a stacked bed structure, characterized in that: It comprises a porous medium piled bed structure, and an air supply device, a water supply system, and a smoke system respectively connected to the porous medium piled bed structure; wherein: the porous medium piled bed structure comprises an inner cylinder (1), and the upper part of the inner cylinder (1) is provided with a uniform porous medium piled bed (2) and a porous medium piled bed to be tested (3) separated from each other, wherein the air supply device respectively introduces nitrogen into the bottom of the uniform porous medium piled bed (2) and the porous medium piled bed to be tested (3), and the upper parts of the uniform porous medium piled bed (2) and the porous medium piled bed to be tested (3) are connected to a gas analysis and detection device, and the gas analysis and detection device respectively detects the nitrogen concentration difference at different positions passing through the porous medium piled bed (2) and the porous medium piled bed to be tested (3); The water supply system respectively introduces flowing water into the uniform porous medium packed bed (2) and the porous medium packed bed to be tested (3), and records the time it takes for water to pass through the two porous medium packed beds, and calculates the time difference between the two. The smoke system allows red smoke and green smoke to enter the uniform porous medium accumulation bed (2) and the porous medium accumulation bed (3) to be tested at the same pressure at the same time, and when the mixed smoke is discharged, a camera is used to take pictures of the corresponding exit positions of the red smoke bottle and the green smoke bottle of the uniform porous medium and the porous medium to be tested respectively; The gas analysis and detection device comprises a plurality of groups of gas collection tubes (10) arranged at the same intervals in a horizontal plane at the center of a uniform porous medium accumulation bed (2) and a porous medium accumulation bed to be tested (3), the upper tube openings of the gas collection tubes being connected to a vacuum pump (9), the left end of the vacuum pump (9) being connected to a gas collection bag (16), the left end of the gas collection bag being provided with a data analysis system, the data analysis system comprising a gas analyzer (17), the left end of the gas analyzer being connected to a computer (18); The gas supply device comprises an air inlet pipe (15) connected to the porous medium stacked bed structure, and a gas mass flow meter (14). The upper and lower ports of the gas mass flow meter (14) are both connected to the air inlet pipe (15), and the left port thereof is connected to the pressure reducing valve (13). A nitrogen bottle (12) is provided at the left end of the pressure reducing valve (13), and the nitrogen bottle (12) is connected to the nitrogen booster (11) via the air inlet pipe (15); The water supply system comprises a water processor (19), the water processor (19) being connected to a water storage tank (21) via a water pump (20) through a drainage pipe (23), a water supply pump being provided at the left end of the water storage tank (21), the water supply pump being connected to the drainage pipe (23) via a water pressure sensor (22), and the water supply system further comprising a screw blower (26) and a generator (25).

2. The uniformity testing system based on the stacked bed structure according to claim 1, characterized in that: The smoke system comprises a red smoke bottle (7) and a green smoke bottle (8), the upper ends of the red smoke bottle (7) and the green smoke bottle (8) are respectively connected to smoke inlet pipes (6), the smoke inlet pipes (6) are respectively provided with pressure valves (4) and pressure gauges (5) to ensure that the red and green smoke flows are the same, and the smoke system also comprises a camera (28).

3. The uniformity testing system based on the stacked bed structure according to claim 1, characterized in that: The porous medium stacked bed structure is a bird's nest proppant or other columnar porous media.

4. The uniformity testing system based on the stacked bed structure according to claim 1, characterized in that: The gas collection bags are multiple gas collection bags of the same model, which are respectively connected to multiple different gas collection pipes, and the gas concentrations thereof are detected in turn by a gas analyzer.

5. The uniformity testing system based on the stacked bed structure according to claim 1, characterized in that: The water pressure sensor is a 0-1.5MPa water supply pressure sensor.

6. The uniformity testing system based on the stacked bed structure according to claim 1, characterized in that: The screw blower is a single screw blower or a twin screw blower.

7. A method for testing a uniformity system based on a stacked bed structure according to any one of claims 1 to 6, characterized in that: The steps include: S1: Under the action of the water supply pump, the water that has been freed of impurities in the water treatment device is pumped out and transmitted to the water storage tank through the drainage pipe. Then, the water in the water storage tank is pumped out by the water pump through the water pressure sensor, and the water is sprayed into the two porous medium stacking beds respectively; S2: Use a computer to record the time it takes for water to flow through two porous media beds, and calculate the time difference Δt between the two, which is the time coefficient; S3: Turn off the water pump, turn on the generator and the screw blower, and introduce air into the two porous medium stacked beds to dry the stacked bed particles in preparation for the next step; S4: Turn on the nitrogen booster, adjust the pressure reducing valve, pump nitrogen into the nitrogen bottle, and adjust the mass flow meter so that a fixed amount of nitrogen is pumped into the two porous medium stacked beds respectively; S5: Turn on the vacuum pump to extract nitrogen from six locations in the central layer of the two porous media stacked beds respectively, and use the gas analyzer to detect the nitrogen concentration at multiple locations, and calculate the concentration differences Δc1, Δc2, Δc at the same locations of the two porous media stacked bed structures. 3…… Δc n , calculate the average concentration difference Δc = (Δc1+Δc2+Δc3+……Δc n ) / n, n is the number of gas collection tubes, Δc is the concentration coefficient; S6: Turn off the vacuum pump and the nitrogen booster, turn on the generator and the screw blower, and introduce air into the two porous medium stacked beds to prepare for the next step; S7: Open the red smoke bottle and the green smoke bottle at the same time, adjust the pressure valve, and allow the red smoke and the green smoke to enter the two porous medium stacking beds at the same pressure. When the mixed smoke is discharged, use a camera to take pictures of the outlet positions of the red smoke bottle and the green smoke bottle corresponding to the uniform porous medium and the porous medium to be tested, respectively, and record them as photo 1, photo 2, photo 3, and photo 4; S8: close the red smoke bottle and the green smoke bottle, turn on the generator and the screw blower, and introduce air into the two porous medium packed beds to clean the porous medium packed beds; S9: Extract the number of green area pixels of photos 1 and 3, and calculate the ratio of their occupation to the total pigment photos of photos 1 and 3, respectively, recorded as k1 and k3. At the same time, extract the number of red area pixels of photos 2 and 4, and calculate the ratio of their occupation to the total pigment photos of photos 2 and 4, recorded as k2 and k4. , k is the smoke mixing coefficient; S10: According to the above steps, the experimental critical acceptable non-uniformity device is tested to determine its time coefficient Δt0, concentration coefficient Δc0, mixing coefficient k0, and the non-uniformity coefficient is calculated by ; S11: Arrange the data, determine the above time coefficient Δt, concentration coefficient Δc, smoke coefficient k, and substitute them into the non-uniformity coefficient formula , compared with the acceptable non-uniformity u0 obtained in advance experiments. If u>u0, the device is judged to be non-uniform.

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