Experimental device and method for stabilizing oil thickness during combustion of millimeter-level thickness oil layer

Abstract

The invention provides an experimental device and method for stabilizing the oil thickness during combustion of a millimeter-level thickness oil layer. The device mainly comprises an overflow pool, a combustion pool, a supporting assembly and an oil storage pool. The overflow pool is suitable for containing fuel oil, and an oil supplementing opening and an overflow opening are formed in the overflow pool. The combustion pool is clamped in the overflow pool through a supporting assembly, and a communicating hole is formed in the bottom of the combustion pool. The oil storage pool is constructed to supplement fuel oil to the overflow pool through the oil supplementing port, the fuel oil in the overflow pool is allowed to overflow from the overflow port and flow back to the oil storage pool, the fuel oil penetrates through the communicating hole to flow between the overflow pool and the combustion pool, and the liquid level of the overflow pool and the liquid level of the combustion pool are kept flush with the overflow port all the time. And therefore, the oil layer in the combustion cell can maintain a stable millimeter-scale thickness.

Description

Technical Field

[0001] The present disclosure relates to the field of fire safety science and technology, and more specifically, to an experimental device and method for stabilizing the thickness of a millimeter-level thick oil layer when it burns. Background Art

[0002] Liquid oil, known as the "blood" of industry, provides a strong guarantee for the economic and technological development of human society. However, liquid oil itself is flammable and explosive, and its combustion calorific value is generally large. Once liquid oil leaks during production, storage, and transportation, it may bring significant fire hazards to human society. After liquid oil leaks, it may encounter physical boundaries such as fire barriers and fences. The thickness of the oil layer may slowly increase with the increase in leakage time, and the thickness range may transition from millimeters to centimeters. In the above process, the oil layer may be ignited by an ignition source, resulting in combustion on the surface of the oil. Conducting oil layer combustion experiments with millimeter to centimeter oil layer thicknesses and having a deep understanding of their combustion characteristics are of great significance to improving the fire prevention and control capabilities of the petrochemical industry.

[0003] In the combustion behavior of oil layers under boundary constraints, the combustion rate of the oil layer is one of the most important combustion characteristic parameters. The combustion rate will directly affect the flame height, external heat radiation, etc. The combustion rate of the oil layer is mainly determined by the heat convection, heat radiation transferred from the flame to the oil layer, and the heat conduction from the side wall boundary to the oil layer. Previous researchers have found that the thickness of the oil layer will affect the combustion rate of the oil layer. For an oil layer with a certain initial oil volume, as the combustion proceeds, the thickness of the oil layer will gradually decrease, and the oil layer may not be able to absorb all the radiant heat flux from the flame. Part of the radiant heat flux will directly penetrate the oil layer to the substrate surface and be absorbed by the substrate. There may also be heat convection between the oil layer and the substrate. The above heat transfer will change with the change of the oil layer thickness, thereby changing the combustion rate. The dynamic change of the combustion rate will make it impossible for researchers to obtain enough data samples to analyze the combustion behavior of millimeter-level oil layers under certain oil thickness conditions. Therefore, a method and experimental device for maintaining stable oil thickness when a millimeter-level thick oil layer is burning is needed. There are two main types of existing oil layer level control, namely mechanical and electronic. Mechanical liquid level control devices are usually composed of components such as floats, rods and valves. They are low in cost and high in reliability, but have poor accuracy. Electronic liquid level control devices are mainly based on the principle of capacitive induction. When the height of the measured medium immersed in the measuring electrode changes, the capacitance of the capacitor will change accordingly, and then output different current signals. It has high requirements for the temperature and cleanliness of the working environment. For the combustion behavior of millimeter-level thick oil layers, the height of the components of the mechanical liquid level control device itself is often at the centimeter level, and its accuracy is difficult to meet the control of millimeter-level thick oil layers; the electronic components of the electronic liquid level control device are difficult to work normally for a long time in the high temperature environment generated by combustion, and are easily damaged. Therefore, the existing liquid level control device cannot meet the control requirements of the oil thickness when the millimeter-level thick oil layer is burning. It is now necessary to develop an experimental device that can stabilize the oil thickness when the millimeter-level thick oil layer is burning. Summary of the invention

[0004] In view of this, the present disclosure provides an experimental device and method for stabilizing the oil thickness when the millimeter-level thick oil layer is burning, which can keep the oil layer thickness stable in the millimeter-level thick oil layer combustion experiment and obtain more and more accurate data samples.

[0005] One aspect of the present disclosure provides an experimental device for stabilizing the oil thickness when a millimeter-level thick oil layer burns, comprising: an overflow tank, suitable for accommodating fuel oil, the overflow tank being provided with an oil replenishing port and an overflow port; a combustion tank, which is erected in the overflow tank through a supporting assembly, and a connecting hole is formed at the bottom of the combustion tank; an oil storage tank, which is configured to replenish fuel oil into the overflow tank through the oil replenishing port, and allow the fuel in the overflow tank to overflow from the overflow port and flow back to the oil storage tank, and the fuel oil flows between the overflow tank and the combustion tank through the connecting hole, so as to maintain the oil supply between the overflow tank and the combustion tank. The liquid surface of the combustion pool is always level with the overflow port to maintain the millimeter-level thickness of the oil layer in the combustion pool stable; wherein the support assembly includes a plurality of support members spaced apart along the periphery of the bottom of the combustion pool, and is configured to drive the combustion pool to move back and forth in a vertical direction to adjust the thickness h of the oil layer between the liquid surface of the combustion pool and the bottom of the combustion pool; the support member includes a lifter, a fixed end of the lifter is mounted on the inner bottom wall of the overflow pool, and a movable end of the lifter is mounted on the bottom of the combustion pool to lift the combustion pool to a target height.

[0006] According to an embodiment of the present disclosure, the bottom of the combustion pool is configured to be circular, and a plurality of the communicating holes are provided and distributed along multiple radial directions.

[0007] According to an embodiment of the present disclosure, it also includes a fireproof cover plate with a hollow portion, which is sealed on the opening of the overflow pool and is suitable for allowing the fuel in the combustion pool to burn while preventing the flame from spreading to the overflow pool.

[0008] According to an embodiment of the present disclosure, a peristaltic pump is also included, which is suitable for pumping the fuel in the above-mentioned oil storage tank into the above-mentioned overflow tank, and making the fuel in the above-mentioned overflow tank always in an overflow state.

[0009] According to an embodiment of the present disclosure, a balance is also included, which is suitable for measuring the mass change caused by the combustion of fuel.

[0010] According to an embodiment of the present disclosure, a test bench is also included, the test bench and the oil storage tank are placed on the balance, and the overflow tank is placed on the test bench.

[0011] Another aspect of the present disclosure provides a method for stabilizing the thickness of a millimeter-level thick oil layer when it burns, based on an experimental device for stabilizing the thickness of a millimeter-level thick oil layer when it burns in any of the above embodiments, comprising: setting the thickness of the oil layer h, measuring the distance H between the overflow port and the bottom of the overflow pool, and calculating Hh to obtain the height required by the support component; injecting the fuel required for the experiment into the oil storage pool, the amount of oil is based on the combustion rate value v in the quasi-steady-state combustion stage, combined with the experimental time t, and v*t is calculated to obtain the required amount of oil; starting the peristaltic pump, and adjusting the fuel supply rate V of the peristaltic pump to be greater than the combustion rate value v, until the fuel in the overflow pool can flow out of the overflow port; covering the fireproof cover and sealing it with sealant; calibrating the balance and recording the readings, and igniting the fuel in the combustion pool; taking multiple time nodes t1, t2, t3..., and recording the readings of the balance at the corresponding time, and calculating the combustion rate.

[0012] The present disclosure provides an experimental device for stabilizing the oil thickness when a millimeter-level thick oil layer burns. The device uses an overflow pool, a combustion pool, and a connecting hole to form a communicating vessel, and the combustion pool is arranged inside the overflow pool, so that the temperature inside the communicating vessel is highly consistent, and the liquid levels of the overflow pool and the combustion pool are highly stable, and can quickly return to a flat state after being affected. At the same time, the oil storage pool continuously replenishes fuel to the overflow pool, and the overflow pool is always in an overflow state, so that the thickness of the oil layer inside the combustion pool is highly stable, meeting the requirements of the millimeter-level thick oil layer combustion experiment. In addition, multiple lifting instruments are used to support the combustion pool and directly adjust the oil layer thickness h, which has a higher controllable accuracy, making the entire device more compact and reducing the occupied space. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The above and other objects, features and advantages of the present disclosure will become more apparent through the following description of the embodiments of the present disclosure with reference to the accompanying drawings, in which:

[0014] Figure 1 It is a schematic diagram of the principle of an experimental device provided by the present disclosure for stabilizing the oil thickness when a millimeter-level thick oil layer burns;

[0015] Figure 2 yes Figure 1 A schematic plan view of an overflow basin in the exemplary embodiment shown, showing the overflow port;

[0016] Figure 3 yes Figure 1 The local enlarged view in Figure 2 shows the thickness of the oil layer;

[0017] Figure 4 yes Figure 1 A schematic plan view of a combustion pool in the exemplary embodiment shown, showing the communication holes;

[0018] Figure 5 It is a flow chart of the oil layer combustion experimental method provided by the present disclosure.

[0019] In the drawings, the meanings of the reference numerals are as follows:

[0020] 1. Overflow pool;

[0021] 11. Oil filling port;

[0022] 12. Overflow port;

[0023] 2. Burning pool;

[0024] 21. Communication hole;

[0025] 3. Support components;

[0026] 31. Supporting parts;

[0027] 4. Oil storage tank;

[0028] 5. Fireproof cover;

[0029] 6. Peristaltic pump;

[0030] 7. Balance;

[0031] 8. Experimental bench. DETAILED DESCRIPTION

[0032] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of the present disclosure. In the following detailed description, for ease of explanation, many specific details are set forth to provide a comprehensive understanding of the embodiments of the present disclosure. However, it is apparent that one or more embodiments may also be implemented without these specific details. In addition, in the following description, descriptions of known structures and technologies are omitted to avoid unnecessary confusion of the concepts of the present disclosure.

[0033] The terms used herein are only for describing specific embodiments and are not intended to limit the present disclosure. The terms "comprise", "include", etc. used herein indicate the existence of the features, steps, operations and / or components, but do not exclude the existence or addition of one or more other features, steps, operations or components.

[0034] All terms (including technical and scientific terms) used herein have the meanings commonly understood by those skilled in the art unless otherwise defined. It should be noted that the terms used herein should be interpreted as having a meaning consistent with the context of this specification and should not be interpreted in an idealized or overly rigid manner.

[0035] When using expressions such as "at least one of A, B, and C, etc.", they should generally be interpreted according to the meaning of the expression commonly understood by those skilled in the art (for example, "a system having at least one of A, B, and C" should include but is not limited to a system having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, C, etc.).

[0036] Figure 1 This is a schematic diagram of the principle of an experimental device for stabilizing the thickness of a millimeter-level oil layer during combustion provided by the present disclosure. Figure 2 yes Figure 1 A schematic plan view of an overflow tank in the exemplary embodiment shown, showing the overflow port, Figure 3 yes Figure 1 The enlarged view of the oil layer shows the oil layer thickness. Figure 4 yes Figure 1 A schematic plan view of a combustion pool in an exemplary embodiment is shown, showing the communication holes.

[0037] The embodiment of the present disclosure provides an experimental device for stabilizing the thickness of a millimeter-level oil layer during combustion, such as Figure 1-Figure 4 As shown, it includes an overflow pool 1, a combustion pool 2, a support assembly 3 and an oil storage pool 4. The overflow pool 1 is suitable for accommodating fuel, and an oil replenishment port 11 and an overflow port 12 are provided on the overflow pool 1. The combustion pool 2 is clamped in the overflow pool 1 through the support assembly 3, and a connecting hole 21 is formed at the bottom of the combustion pool 2. The oil storage pool 4 is configured to replenish fuel to the overflow pool 1 through the oil replenishment port 11, and allow the fuel in the overflow pool 1 to overflow from the overflow port 12 and flow back to the oil storage pool 4, and the fuel flows between the overflow pool 1 and the combustion pool 2 through the connecting hole 21, so as to maintain the liquid level of the overflow pool 1 and the combustion pool 2 always level with the overflow port 12, so as to maintain the millimeter-level thickness of the oil layer in the combustion pool 2 stable. Among them, the support assembly 3 includes a plurality of support members 31 spaced apart along the periphery of the bottom of the combustion pool 2, and is configured to drive the combustion pool 2 to move back and forth in the vertical direction to adjust the thickness h of the oil layer between the liquid level of the combustion pool 2 and the bottom of the combustion pool 2. The support member 31 includes a lifter, a fixed end of which is mounted on the inner bottom wall of the overflow pool 1, and a movable end of which is mounted on the bottom of the combustion pool 2 to lift the combustion pool 2 to a target height.

[0038] In such an implementation, the overflow pool 1, the combustion pool 2 and the connecting hole 21 on the combustion pool 1 are first used to form a communicating vessel, so that the fuel liquid level in the overflow pool 1 and the fuel liquid level in the combustion pool 2 can be level. Then, the oil storage pool 4 is used to replenish fuel to the overflow pool 1 to avoid the simultaneous increase or decrease of the fuel in the overflow pool 1 and the combustion pool 2 due to fuel combustion. Further, by setting an overflow port 12 on the overflow pool 1, the oil storage pool 4 continuously replenishes fuel to the overflow pool 1 so that the fuel can flow back to the oil storage pool 4 through the overflow port 12. This can effectively ensure that the liquid level in the combustion pool 2 is always at the position of the overflow port 12, so that the oil storage pool 4 can more easily maintain a stable liquid level. It only needs to ensure that the fuel in the overflow pool 1 is always in an overflow state, which reduces the accuracy requirements for the fuel replenishment efficiency and also reduces the difficulty of monitoring the liquid level. At the same time, the combustion pool 2 is set up in the overflow pool 1 through the support assembly 3. The heat transfer efficiency between the combustion pool 2 and the overflow pool 1 is high, the connection distance is short, and the response speed is faster. It can meet experiments with higher requirements, such as millimeter-level thick oil layer combustion experiments, to avoid the inability to effectively transfer heat between the two containers of the communicating vessel when the fuel is burning. The fuel density in the two containers changes due to the temperature. In addition, the connecting pipe has a certain length, resulting in a height difference between the liquid levels of the two containers in a short time, which cannot meet the millimeter-level and other high-precision experimental requirements. In addition, the combustion pool 2 is supported by multiple support members 31, that is, the lifting instrument, and the oil layer thickness h is directly adjusted, which has a higher controllable accuracy and also saves the space occupied by the device.

[0039] In detail, the oil layer thickness h is set according to the experimental requirements. The liquid level of the combustion pool 2, the liquid level of the overflow pool 1 and the overflow port 12 are level. Therefore, the oil layer thickness h can also be understood as the height difference between the overflow port 12 and the bottom of the combustion pool 2. It is only necessary to measure the height of the overflow port 12 in advance and then determine the oil layer thickness h to obtain the required adjustment amount of the support assembly 3.

[0040] In some optional embodiments, such as Figure 1 As shown, two support members 31 are provided. In addition, more support members 31 may be provided to improve the stability of the support. Preferably, there are 2-5 support members. Too many support members should not be provided to avoid complicated steps during adjustment.

[0041] Furthermore, the lifting instrument is driven by hydraulic or pneumatic pressure, and its fixed end and movable end can be connected to the overflow pool 1 and the combustion pool 2 by using a vacuum suction cup. Optionally, the minimum scale of the lifting instrument is 0.01mm and the accuracy is 0.03mm.

[0042] In an exemplary embodiment, the bottom of the combustion pool 2 is configured to be circular, and a plurality of communicating holes 21 are provided and distributed along multiple radial directions.

[0043] Specifically, if Figure 1 and Figure 4 As shown, the combustion pool 2 is formed by a stainless steel bottom plate and an annular stainless steel side plate. The diameter of the stainless steel bottom plate is 40 cm, the height of the annular stainless steel side plate is 2 cm, the thickness is 0.2 cm, and the diameter of the annular plate is determined by experimental requirements. The connecting holes 21 are arranged on the stainless steel bottom plate, preferably distributed in multiple radial directions, and the diameter is preferably 5 mm.

[0044] In an exemplary embodiment, the experimental device for stabilizing the oil thickness when the oil layer with millimeter thickness burns also includes a fireproof cover plate 5 with a hollow portion, which seals the opening of the overflow pool 1 and is suitable for allowing the fuel in the combustion pool 2 to burn while preventing the flame from spreading to the overflow pool 1.

[0045] Exemplarily, the overflow pool 1 is made of stainless steel material in one piece, with a diameter of 50 cm and a depth of 10 cm. The diameter of the fireproof cover plate 5 is the same as that of the overflow pool 1, and after covering, the gap is filled with high temperature resistant sealant.

[0046] In some other embodiments, two overflow ports 12 are symmetrically arranged on the overflow tank 1, and the shape of the overflow port 12 includes but is not limited to a circle or a rectangle. When the overflow port 12 is configured as a rectangle, the upper end surface of the overflow port 12 is flush with the upper end surface of the side wall of the overflow tank 1, that is, the overflow port 12 is configured as a rectangular groove formed on the side wall of the overflow tank 1, and optionally, the groove has a depth of 4.0 cm and a width of 10 cm, and the surface of the groove is finely processed to be as smooth as possible to reduce the flow resistance of the fuel.

[0047] In an exemplary embodiment, the experimental device for stabilizing the oil thickness when the oil layer with millimeter thickness burns also includes a peristaltic pump 6, which is suitable for pumping the fuel in the oil storage tank 4 into the overflow tank 1, and making the fuel in the overflow tank 1 always in an overflow state.

[0048] The peristaltic pump 6 can more accurately and conveniently control the flow rate during oil replenishment. Specifically, the model of the peristaltic pump 6 is LONGER-BT600. The peristaltic pump 6 and the oil replenishment port 11, as well as the overflow port 12 and the oil reservoir 4 are connected by Saint-Gobain Tygon F-4040-A corrosion-resistant hose, wherein the hose between the peristaltic pump 6 and the oil replenishment port 11 has an inner diameter of 3.2 mm and a wall thickness of 1.6 mm. The hose between the overflow port 12 and the oil reservoir 4 has an inner diameter of 4.8 mm and a wall thickness of 1.6 mm.

[0049] According to an embodiment of the present disclosure, the experimental device for stabilizing the oil thickness when the oil layer with millimeter-level thickness burns also includes a balance 7, which is suitable for measuring the mass change caused by the combustion of fuel, and combining it with the combustion time to obtain the combustion rate.

[0050] In an exemplary embodiment, a test bench 8 is further included. The test bench 8 and the oil storage tank 4 are placed on a balance 7 , and the overflow tank 1 and the internal combustion tank 2 are placed on the test bench 8 .

[0051] In such an embodiment, the balance 7 is calibrated before the fuel is burned, and the reading at this time is recorded. After the experiment is finished, the reading of the balance 7 is recorded again to obtain the mass of the consumed fuel. Since the balance 7 weighs all components at the same time, it is beneficial to improve the accuracy of the experimental data.

[0052] An exemplary embodiment of the present disclosure further provides a method for stabilizing the thickness of an oil layer with a millimeter-level thickness when the oil layer burns, comprising steps S1-S6.

[0053] Step S1, setting the oil layer thickness h, measuring the distance H between the overflow port 12 and the bottom of the overflow pool 1, and calculating Hh to obtain the height that the support assembly 3 needs to provide.

[0054] Step S2: inject the required amount of oil for the experiment into the oil reservoir 4. The required amount of oil is calculated based on the combustion rate value v in the quasi-steady-state combustion stage in the prior art and the experimental time t to obtain the required amount of oil by calculating v*t.

[0055] Step S3, starting the peristaltic pump 4, and adjusting the fuel supply rate V of the peristaltic pump 4 to be slightly greater than v, until the fuel in the overflow tank 1 can flow out from the overflow port 12.

[0056] Step S4, cover the fireproof cover plate 5 and seal it with a high temperature resistant sealant.

[0057] Step S5, calibrate the balance 7 and record the readings, and ignite the fuel in the combustion pool 2.

[0058] Step S6, taking multiple time nodes t1, t2, t3, ..., and recording the readings of the balance 7 at the corresponding time, and calculating the combustion rate.

[0059] It will be appreciated by those skilled in the art that the features described in the various embodiments of the present disclosure may be combined and / or combined in a variety of ways, even if such combinations or combinations are not explicitly described in the present disclosure. In particular, without departing from the spirit and teachings of the present disclosure, the features described in the various embodiments of the present disclosure may be combined and / or combined in a variety of ways. All of these combinations and / or combinations fall within the scope of the present disclosure.

[0060] The embodiments of the present disclosure are described above. However, these embodiments are only for illustrative purposes and are not intended to limit the scope of the present disclosure. Although the embodiments are described above, this does not mean that the measures in the various embodiments cannot be used in combination to advantage. Without departing from the scope of the present disclosure, those skilled in the art may make a variety of substitutions and modifications, which should all fall within the scope of the present disclosure.

Claims

1. An experimental device for stabilizing the thickness of a millimeter-level oil layer during combustion, characterized in that: include: An overflow tank (1) is suitable for containing fuel oil, and the overflow tank (1) is provided with a fuel replenishment port (11) and an overflow port (12); A combustion pool (2) is erected in the overflow pool (1) via a support assembly (3), and a communicating hole (21) is formed at the bottom of the combustion pool (2); The oil storage tank (4) is configured to replenish the overflow tank (1) with fuel through the oil replenishment port (11), and allow the fuel in the overflow tank (1) to overflow from the overflow port (12) and flow back to the oil storage tank (4), and the fuel flows between the overflow tank (1) and the combustion tank (2) through the connecting hole (21), so as to maintain the liquid levels of the overflow tank (1) and the combustion tank (2) always level with the overflow port (12), so as to maintain the millimeter-level thickness of the oil layer in the combustion tank (2) stable; The support assembly (3) comprises a plurality of support members (31) spaced apart along the periphery of the bottom of the combustion pool (2), and is configured to drive the combustion pool (2) to move back and forth in a vertical direction, so as to adjust the thickness h of the oil layer between the liquid surface of the combustion pool (2) and the bottom of the combustion pool (2); The support member (31) comprises a lifter, wherein a fixed end of the lifter is mounted on the inner bottom wall of the overflow pool (1), and a movable end of the lifter is mounted on the bottom of the combustion pool (2) to lift the combustion pool (2) to a target height.

2. The experimental device for stabilizing the thickness of a millimeter-level oil layer during combustion according to claim 1 is characterized in that: The bottom of the combustion pool (2) is configured in a circular shape, and a plurality of the communication holes (21) are provided and distributed along a plurality of radial directions.

3. The experimental device for stabilizing the thickness of a millimeter-level oil layer during combustion according to claim 1 is characterized in that: It also comprises a fireproof cover plate (5) with a hollow portion, which covers the opening of the overflow pool (1) and is suitable for allowing the fuel in the combustion pool (2) to burn while preventing the flame from spreading to the overflow pool (1).

4. The experimental device for stabilizing the thickness of a millimeter-level oil layer during combustion according to claim 1 is characterized in that: It also includes a peristaltic pump (6) adapted to pump the fuel in the oil storage tank (4) into the overflow tank (1), and to ensure that the fuel in the overflow tank (1) is always in an overflowing state.

5. The experimental device for stabilizing the thickness of a millimeter-level oil layer during combustion according to claim 1 is characterized in that: Also included is a balance (7) suitable for measuring the mass change resulting from the combustion of the fuel.

6. The experimental device for stabilizing the thickness of a millimeter-level oil layer during combustion according to claim 5 is characterized in that: It also includes an experimental bench (8), wherein the experimental bench (8) and the oil storage tank (4) are placed on the balance (7), and the overflow tank (1) is placed on the experimental bench (8).

7. A method for stabilizing the thickness of a millimeter-level oil layer during combustion, characterized in that: The experimental device for stabilizing the oil thickness when the millimeter-level thick oil layer burns according to any one of claims 1 to 6 comprises: The oil layer thickness h is set, the distance H between the overflow port (12) and the bottom of the overflow tank (1) is measured, and Hh is calculated to obtain the height required by the support assembly (3); The fuel required for the experiment is injected into the oil reservoir (4). The amount of fuel is based on the combustion rate value v in the quasi-steady-state combustion stage and the experimental time t. The required amount of fuel is calculated by v*t. Starting the peristaltic pump (6), and adjusting the fuel supply rate V of the peristaltic pump (6) to be greater than the combustion rate value v, until the fuel in the overflow tank (1) can flow out from the overflow port (12); Cover the fireproof cover plate (5) and seal it with a sealant; Calibrate the balance (7) and record the reading, and ignite the fuel in the combustion pool (2); Take multiple time nodes t1, t2, t3, ..., and record the readings of the balance (7) at the corresponding time to calculate the combustion rate.

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