Coke stacking state air permeability detection device and use method

Abstract

The invention discloses a coke stacking state gas permeability detection device and a use method, and relates to the technical field of coking coal performance evaluation and coal blending coking, the coke stacking state gas permeability detection device comprises a support table, a sample bin, a gas supply system, a gas pressure test system and a pressure dredging device, a net-shaped supporting plate for supporting coke is arranged in the sample bin, a gas inlet is formed in the bottom of the sample bin, and a gas outlet is formed in the top of the sample bin; the gas supply system is communicated with a gas inlet at the bottom of the sample bin, the gas pressure testing system comprises a pressure detection unit for detecting a first pressure value at the gas inlet at the bottom of the sample bin and a second pressure value at a gas outlet at the top of the sample bin, and a recording unit for recording the difference delta P between the first pressure value and the second pressure value; the pressure dredging device is arranged at the top of the sample bin and is used for relieving pressure when the pressure in the bin exceeds a safety threshold value. The implementation method is scientific and rigorous, and the coke permeability is visually detected.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of coking coal performance evaluation and coal blending coking technology, and particularly relates to a coke accumulation state permeability detection device. BACKGROUND

[0002] Coking coal, as a raw material for metallurgical coke production, has a direct influence and constraint on the thermal performance of metallurgical coke. Metallurgical coke is a core raw material in steel production, which is irreplaceable, and is the heat source, reducing agent, column skeleton and permeation agent for blast furnace production, and is also an important adjustment parameter for the blast furnace production process.

[0003] With the development of blast furnace smelting technology, such as large-scale blast furnace, high blast temperature technology and blast oxygen enrichment coal injection technology, coke, as the column skeleton in the blast furnace, plays a more prominent role in ensuring the air and liquid permeability in the blast furnace. During the blast furnace distribution process, coke, sintered material, pellet material, limestone and the like are used together for smelting, and the air flow needs to be dredged to allow various gases to pass through smoothly.

[0004] However, there is currently a lack of an objective and effective method for evaluating the permeability of bulk metallurgical coke. This is difficult to meet the current low-carbon, green and energy-saving steel production concept, and is a key constraint on the efficient use of metallurgical coke, the reduction of blast furnace fuel ratio and the improvement of blast furnace utilization coefficient. There are also defects in the in-depth study and analysis of the smelting behavior of metallurgical coke in the blast furnace and the efficient use thereof. The test method for accurately representing the permeability of metallurgical coke and determining the permeability index has become an important characterization parameter and feature method for the green and efficient use of coke, and is also a performance and quality parameter that is focused on by coking producers and blast furnace producers in the metallurgical industry. SUMMARY

[0005] The purpose of the present application is to provide a coke accumulation state permeability detection device and a use method, to solve the problem of lacking an objective and effective method for evaluating the permeability of bulk metallurgical coke in the prior art, and to realize a scientific and rigorous method for detecting the permeability of coke.

[0006] To achieve the above-mentioned purpose, the present application provides the following solutions:

[0007] The application provides a coke accumulation state permeability detection device, which comprises a support table, a sample bin, a gas supply system, a gas pressure test system and a pressure relief device, the sample bin is fixedly installed on the support table and is used for containing a coke sample, a mesh support plate for supporting the coke is arranged in the sample bin, a gas inlet is arranged at the bottom of the sample bin, and a gas outlet is arranged at the top of the sample bin; the gas supply system is connected with the gas inlet at the bottom of the sample bin and is used for providing a stable flow of gas into the sample bin; the gas pressure test system comprises a pressure detection unit for detecting a first pressure value at the gas inlet at the bottom of the sample bin and a second pressure value at the gas outlet at the top of the sample bin, and a recording unit for recording a difference ΔP between the first pressure value and the second pressure value; the pressure relief device is arranged at the top of the sample bin and is used for pressure relief when the pressure in the bin exceeds a safety threshold.

[0008] Preferably, the upper part of the sample bin is a cylindrical structure, and the bottom part is a conical structure, and the mesh support plate is installed at the joint of the cylindrical structure and the conical structure.

[0009] Preferably, the gas pressure test system further comprises:

[0010] an inlet port differential pressure transmitter connected to the bottom of the sample bin and used for detecting the first pressure value;

[0011] an outlet port differential pressure transmitter connected to the top of the sample bin and used for detecting the second pressure value;

[0012] a long chart recorder electrically connected with the inlet port differential pressure transmitter and the outlet port differential pressure transmitter and used for recording and outputting the pressure difference ΔP.

[0013] Preferably, the gas pressure test system further comprises a U-shaped tube pressure gauge, two ends of the U-shaped tube pressure gauge are connected to the bottom and the top of the sample bin respectively, and the U-shaped tube pressure gauge is used for comparison and verification of pressure measurement of the inlet port differential pressure transmitter and the outlet port differential pressure transmitter.

[0014] Preferably, the pressure relief device comprises:

[0015] a relief pipeline connected to the gas outlet at the top of the sample bin;

[0016] a gas relief valve installed on the relief pipeline; and

[0017] a pressure gauge installed on the relief pipeline and located at the front end of the gas relief valve and used for real-time monitoring of the pressure at the top of the sample bin.

[0018] Preferably, the gas supply system comprises a gas source, a regulating valve and an electronic flowmeter, and the gas output by the gas source is connected to the gas inlet at the bottom of the sample chamber through the regulating valve and the electronic flowmeter in sequence.

[0019] Preferably, the gas source is an air compressor or a high-pressure gas cylinder.

[0020] Preferably, the sample chamber is made of transparent material.

[0021] Preferably, the transparent material is organic glass.

[0022] Preferably, the top of the sample chamber is provided with a sealable top cover, and the sealable top cover is sealed and connected to the sample chamber through a sealing bolt.

[0023] The application also provides a use method of the coke accumulation state permeability detection device.

[0024] S1: preparing a coke sample, crushing and sieving representative coke into a preset particle size range, weighing a certain amount of coke sample into the sample chamber, ensuring that the coke sample is evenly laid on the net-shaped support plate, then tightly covering the sealing top cover and sealing through the sealing bolt;

[0025] S2: starting the gas supply system, adjusting the gas output by the gas source, controlling the gas pressure through the regulating valve, setting and maintaining a stable gas flow through the electronic flowmeter, and making the gas enter the chamber through the gas inlet at the bottom of the sample chamber at a uniform speed;

[0026] S3: after the gas flow is stable, starting the gas pressure test system, detecting the first pressure value at the gas inlet at the bottom of the sample chamber through the inlet port differential pressure transmitter, detecting the second pressure value at the gas outlet at the top through the outlet port differential pressure transmitter, and recording and outputting the difference ΔP between the first pressure value and the second pressure value in real time through the long chart recorder, while comparing and verifying the pressure difference ΔP through the U-shaped tube pressure gauge to ensure the accuracy of the measurement data;

[0027] S4: during the detection process, monitoring the pressure at the top of the sample chamber in real time through the pressure gauge of the pressure unblocking device, and opening the gas vent valve for pressure relief when the pressure in the chamber exceeds the safety threshold to ensure the safety of the device operation;

[0028] S5: according to the recorded pressure difference ΔP and the set gas flow, combining the parameters such as the accumulation height and cross-sectional area of the coke sample, calculating the permeability coefficient under the coke accumulation state to complete the detection of the permeability of the coke sample.

[0029] The application has the following technical effects compared with the prior art:

[0030] The present application provides a coke accumulation state permeability detection device and a use method, a support table provides a stable support structure for the whole device, and ensures the stability of the device. A sample bin is fixed on the support table, which provides a fixed placement space for the coke sample, and the net-shaped support plate can effectively support the coke to prevent it from falling and affecting the test. The design of the gas inlet at the bottom and the gas outlet at the top ensures that the gas can flow smoothly in the sample bin, provides a basic gas flow path for subsequent detection of permeability, and enables normal detection. The gas supply system is in communication with the bottom of the sample bin and can provide stable flow of gas, ensuring that a stable and controllable gas flow passes through the coke accumulation layer during the permeability detection process, providing stable gas conditions for accurate measurement of coke permeability, which is beneficial to the accuracy and repeatability of the detection results, and avoids the problem of large detection errors caused by unstable gas flow. The gas pressure test system can accurately obtain the pressure values at the bottom and the top of the sample bin, and record the difference ΔP between the two. Through this pressure difference, the pressure loss of the gas passing through the coke accumulation layer can be directly reflected, thereby providing key data support for calculating the coke permeability index, and then scientifically judging the permeability performance of the coke accumulation state. The pressure unblocking device is at the top of the sample bin, which can timely monitor the pressure in the bin, and opens the pressure relief function when the pressure exceeds the safety threshold, ensuring the safety and reliability of the test process. Avoiding damage to the device caused by high pressure in the bin, ensuring normal operation of the equipment, and also ensuring the safety of the operator and the smooth progress of the test. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0032] Figure 1 The structure diagram of the coke accumulation state permeability detection device provided by the present application is shown in the figure.

[0033] In the figure: 1, support table; 2, sample bin; 3, net-shaped support plate; 4, air compressor; 5, regulating valve; 6, electronic flowmeter; 7, inlet end pressure gauge; 8, U-shaped tube; 9, inlet port differential pressure transmitter; 10, long chart recorder; 11, outlet differential pressure transmitter; 12, pressure gauge; 13, gas unblocking valve; 14, U-shaped tube metering scale; 15, unblocking pipeline; 16, sealing top cover; 17, sealing bolt. DETAILED DESCRIPTION

[0034] Clearly, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts, fall within the protection scope of the present application.

[0035] The purpose of the present application is to provide a coke accumulation state permeability detection device and a use method, to solve the problem of lacking objective and effective evaluation method of bulk metallurgical coke permeability in the prior art, and to realize scientific and rigorous method and intuitive representation for detecting coke permeability.

[0036] In order to make the above-mentioned purposes, characteristics and advantages of the present application more obvious and easy to understand, the present application will be further described in detail below in combination with the drawings and specific embodiments.

[0037] The present application provides a coke accumulation state permeability detection device, such as Figure 1As shown, it comprises: a support table 1, a sample bin 2, a gas supply system, a gas pressure testing system and a pressure relief device, the sample bin 2 is fixedly installed on the support table 1, used for containing the coke sample, the inside of the sample bin 2 is provided with a mesh support plate 3 for supporting the coke, the bottom of the sample bin 2 is provided with a gas inlet, and the top is provided with a gas outlet; the gas supply system is in communication with the gas inlet at the bottom of the sample bin 2, used for providing a stable flow of gas into the sample bin 2; the gas pressure testing system comprises a pressure detection unit for detecting the first pressure value at the bottom gas inlet of the sample bin 2 and the second pressure value at the top gas outlet, and a recording unit for recording the difference ΔP between the first pressure value and the second pressure value; the pressure relief device is arranged at the top of the sample bin 2, used for pressure relief when the pressure in the bin exceeds the safety threshold. The support table 1 provides a stable support structure for the entire device, ensuring the stability of the device. The sample bin 2 is fixed on the support table 1, providing a fixed placement space for the coke sample, and the mesh support plate 3 can effectively support the coke to prevent it from falling and affecting the test. The design of the gas inlet at the bottom and the gas outlet at the top ensures that the gas can flow smoothly in the sample bin 2, providing a basic gas flow path for subsequent detection of permeability, so that the detection can be carried out normally. The gas supply system is in communication with the bottom of the sample bin 2 and can provide a stable flow of gas, ensuring that there is a stable and controllable gas flow through the coke accumulation layer during the permeability detection process, providing stable gas conditions for accurate measurement of coke permeability, which is conducive to the accuracy and repeatability of the test results, avoiding the problem of large detection errors caused by unstable gas flow. The gas pressure testing system can accurately obtain the pressure values at the bottom and top of the sample bin 2 and record the difference ΔP between them. Through this pressure difference, the pressure loss of the gas passing through the coke accumulation layer can be directly reflected, thereby providing key data support for calculating the coke permeability index, and then scientifically judging the permeability performance of the coke under the accumulation state. The pressure relief device is at the top of the sample bin 2, which can timely monitor the pressure in the bin, and open the pressure relief function when the pressure exceeds the safety threshold, ensuring the safety and reliability of the test process. Avoiding damage to the device caused by high pressure in the bin, ensuring normal operation of the equipment, and also ensuring the safety of the operators and the smooth progress of the test.

[0038] In a preferred embodiment, the upper part of the sample bin 2 is a cylindrical structure, and the bottom is a conical structure, the mesh support plate 3 is installed at the junction of the cylindrical structure and the conical structure, and the design of the upper part of the sample bin 2 as a cylindrical structure and the bottom as a conical structure facilitates the installation of the pressure testing system, the fixing of the sealed top cover 16 and other operations; the conical bottom is conducive to the uniform flow of gas from the bottom to the top through the coke sample, avoiding local concentration of gas and improving the uniformity of gas flow distribution. The mesh support plate 3 is installed at the junction, which can effectively support the coke and will not hinder the smooth flow of gas, which is helpful to more accurately simulate the gas flow situation of the coke accumulation in the actual blast furnace, and improve the accuracy of the permeability detection.

[0039] In a preferred embodiment, the gas pressure test system further comprises:

[0040] An inlet port differential pressure transmitter 9 connected to the bottom of the sample chamber 2 for detecting the first pressure value;

[0041] An outlet port differential pressure transmitter 11 connected to the top of the sample chamber 2 for detecting the second pressure value;

[0042] A long chart recorder 10 electrically connected to the inlet port differential pressure transmitter 9 and the outlet port differential pressure transmitter 11 for recording and outputting the pressure difference ΔP.

[0043] The inlet port differential pressure transmitter 9 accurately detects the bottom pressure, and the outlet port differential pressure transmitter 11 accurately detects the top pressure, both of which are electrically connected to the long chart recorder 10, which can accurately record and output the pressure difference value ΔP in real time. Through these specific device settings, the accuracy and reliability of pressure detection are improved, making the obtained pressure difference value more accurate, thereby ensuring the accuracy of the gas permeability index calculation, providing strong data support for accurately evaluating the gas permeability of coke.

[0044] In a preferred embodiment, the gas pressure test system further comprises a U-tube pressure gauge, the two ends of which are respectively connected to the bottom and top of the sample chamber 2, for pressure measurement comparison and verification with the inlet port differential pressure transmitter 9 and the outlet port differential pressure transmitter 11. The U-tube pressure gauge serves as a backup pressure measurement and verification component, compares the pressure measured by the inlet port differential pressure transmitter 9 and the outlet port differential pressure transmitter 11, and can avoid false results caused by failure or error of a single pressure measurement device. When the measurement results of the two are verified with each other, the reliability and credibility of the data can be greatly improved, ensuring the accuracy of pressure measurement and the accuracy of gas permeability detection results, and reducing the influence of data error.

[0045] In a preferred embodiment, the U-tube pressure gauge comprises a U-tube 8 and a U-tube metering scale 14 on the outer side wall of the U-tube 8. The U-tube and the metering scale on the outer side wall of the U-tube form a U-tube pressure gauge, which is simple and intuitive in structure. The U-tube can intuitively reflect the pressure difference between the two ends, and by reading the metering scale value on the outer side wall, the size of the pressure difference value can be directly obtained, which is convenient for operators to observe and record at any time. In combination with other complex pressure measurement devices, the pressure data can be further verified, and the visualization and accuracy of pressure measurement can be improved.

[0046] In a preferred embodiment, an inlet end pressure gauge 7 is further included, which is arranged at the conical structure of the sample chamber 2 and can display the pressure of the gas entering the sample chamber 2 in real time. The operator can view the gas inlet pressure value in real time, judge whether the gas supply system is working stably according to the value, know in advance whether there is an abnormal situation of gas pressure, and adjust the gas supply system parameters in time to ensure that the gas inlet pressure is stable during the entire detection process, which is beneficial to improve the accuracy of test data.

[0047] In a preferred embodiment, the pressure relief device comprises:

[0048] A relief pipeline 15 connected to the gas outlet at the top of the sample chamber 2;

[0049] A gas relief valve 13 installed on the relief pipeline 15; and

[0050] A pressure gauge 12 installed on the relief pipeline 15 and located at the front end of the gas relief valve 13, for monitoring the pressure at the top of the sample chamber 2 in real time.

[0051] The relief pipeline 15 is connected to the outlet at the top of the sample chamber 2 to provide a channel for pressure relief. The gas relief valve 13 installed on the relief pipeline 15 can accurately control the pressure relief operation, which is opened when pressure relief is needed and closed when the pressure is normal. The pressure gauge 12 located at the front end of the gas relief valve 13 monitors the pressure at the top of the sample chamber 2 in real time, and the operator can judge whether the pressure exceeds the safety threshold by observing the value of the pressure gauge 12, so as to accurately control the opening and closing actions of the gas relief valve 13, ensure the safety of the equipment, and make the test in a safe and stable environment.

[0052] In a preferred embodiment, the gas supply system comprises a gas source, a regulating valve 5 and an electronic flowmeter 6. The gas output by the gas source is connected to the gas inlet at the bottom of the sample chamber 2 in sequence through the regulating valve 5 and the electronic flowmeter 6. The gas source provides the source of gas, and the regulating valve 5 can flexibly adjust the gas flow according to the test needs, so that the gas flow entering the sample chamber 2 meets the requirements of different test conditions. The electronic flowmeter 6 can accurately measure the gas flow and display the real-time flow value, and the operator can accurately control the gas flow according to the value to ensure that the gas flow entering the sample chamber 2 is stable and can be accurately adjusted, which is crucial for accurately measuring the gas permeability of coke and ensuring the comparability of different test data.

[0053] In a preferred embodiment, the gas source is an air compressor 4 or a high-pressure gas cylinder. The air compressor 4 or the high-pressure gas cylinder can meet the requirements of different scales and tests. The air compressor 4 can provide a certain pressure and flow of gas continuously and stably, which is suitable for long-term and continuous detection work. The high-pressure gas cylinder is convenient to carry and flexible to switch. In some temporary or space-limited sites, the appropriate equipment can be selected to provide stable gas according to the actual needs to ensure the smooth development of the test.

[0054] In a preferred embodiment, the sample bin 2 is made of transparent material, which allows the operator to observe the internal coke state in real time during the detection process. For example, the operator can observe whether the coke is evenly distributed or whether there is collapse, and can make timely adjustments to ensure the consistency of test conditions and the accuracy of data, and to further optimize the detection method and operation process.

[0055] In a preferred embodiment, the transparent material is organic glass, which has good transparency and can observe the internal situation. At the same time, it has a certain strength and can withstand a certain pressure to ensure the stability of the structure and the sealing performance of the sample bin 2. Moreover, it is corrosion-resistant and less likely to react with gases or coke in the test, which can ensure the stability of the performance of the sample bin 2 for a long time, prolong the service life of the equipment, and reduce maintenance costs.

[0056] In a preferred embodiment, the top of the sample bin 2 is provided with a sealable top cover 16, which is sealed and connected to the sample bin 2 by a sealing bolt 17. The sealable top cover 16 facilitates the placement and removal of the coke sample into and out of the sample bin 2, and the sealing bolt 17 ensures good sealing performance of the sample bin 2 to prevent gas leakage. This avoids the influence of gas leakage on pressure measurement and air permeability test results, and ensures that the gas flows in the sample bin 2 according to the set path during the entire detection process, thereby improving the accuracy and reliability of the detection results.

[0057] The following is the use method of the above-mentioned coke accumulation state air permeability detection device patent:

[0058] Preparation stage

[0059] Sample preparation: According to the requirements of the national standard "Coke Sample Taking and Preparation GB / T1977", a certain amount (such as 300Kg) of metallurgical coke sample is taken and subjected to a reduction operation, for example, 150Kg of sample is reduced, and then further reduced to obtain 75Kg of sample, which is divided into one test sample and one standby sample. The 75Kg sample is sieved using a 25mm round hole standard sieve, and metallurgical coke larger than 25mm is selected as the test sample. If the sample is less than 50Kg after sieving, the sample weight is increased.

[0060] Device inspection: open the air compressor 4 or high-pressure gas cylinder (according to the selected gas source) as the gas source of the gas supply system. Observe the U-tube pressure, when the U-tube pressure is close to 0, it indicates that the tightness of the whole device is good, and the subsequent test can be carried out.

[0061] Sample loading stage: the detection device that has passed the air tightness test and is in the original state is prepared, 50Kg of test sample is slowly poured from the openable and closable sealing top cover 16 at the top of the sample bin 2, and the pouring process should be kept natural falling of the coke to avoid breaking of the sample. After pouring, the coke in the bin is carefully and evenly leveled to prevent unevenness of the coke, so as to ensure the uniformity of the coke height in the bin and lay a foundation for the accuracy of the subsequent test.

[0062] Measurement and aeration stage

[0063] Height measurement: measure and record the height of the coke in the sample bin 2, denoted as H, which is an important parameter for subsequent calculation of the permeability index.

[0064] Aeration operation: open the regulating valve 5, then open the air compressor 4 or the gas cylinder switch, adjust the gas flow through the regulating valve 5, so that the gas output by the gas supply system enters the sample bin 2 from the gas inlet at the bottom of the sample bin 2 through the regulating valve 5 and the electronic flowmeter 6, and the gas flow is controlled to a reasonable value.

[0065] Data acquisition stage

[0066] Stable aeration and pressure recording: after the gas flow is stable, the long chart recorder 10 will record the first pressure value at the gas inlet at the bottom of the sample bin 2 detected by the inlet port differential pressure transmitter 9, and the second pressure value at the gas outlet at the top of the sample bin 2 detected by the outlet port differential pressure transmitter 11, and output the pressure difference between the two, denoted as ΔP. At the same time, the U-tube pressure gauge is observed at all times, and the pressure difference displayed by the U-tube pressure gauge should be basically close to the pressure difference recorded by the long chart recorder 10, so as to verify the accuracy of the pressure measurement data.

[0067] Pressure monitoring and adjustment: observe the inlet pressure gauge 7 to know the pressure of the gas entering the sample bin 2 in real time; pay attention to the pressure gauge 12 installed on the venting pipeline 15 at the top of the sample bin 2 to monitor the pressure at the top of the sample bin 2 in real time. If the top pressure exceeds the safety threshold, immediately open the gas venting valve 13 to release pressure and ensure the safe and stable operation of the test.

[0068] Calculation stage: calculate the metallurgical coke permeability index f according to the obtained data and the preset formula (such as f=K×(H / ΔP), K is a constant related to the characteristics of the instrument itself, the properties of the gas, etc.), so as to evaluate the permeability performance of the coke under the stacking state.

[0069] End of work phase: after the end of the test, the gas source of the gas supply system is closed, such as the air compressor 4 or the gas cylinder. Open the sealed top cover 16, take out the coke in the sample chamber 2, and clean the device. Regularly check and maintain each part of the device, such as checking the accuracy of the pressure measuring device, the flow regulation performance of the regulating valve 5, the accuracy of the electronic flow meter 6, etc., to ensure that the device can work normally and accurately next time.

[0070] The principles and implementation manners of the present application are described by applying specific examples in the present application. The above examples are only used to help understand the method of the present application and its core idea; meanwhile, for those skilled in the art, according to the idea of the present application, the specific implementation manners and application ranges will be changed. In summary, the content of the present application should not be understood as a limitation of the present application.

Claims

1. A device for detecting the permeability of coke in its stacked state, characterized in that: include: Support platform; The sample chamber is fixedly installed on the support platform and is used to hold coke samples. The sample chamber is equipped with a mesh support plate for supporting the coke. The bottom of the sample chamber is provided with a gas inlet and the top is provided with a gas outlet. A gas supply system, which is connected to a gas inlet at the bottom of the sample chamber, is used to provide a stable flow rate of gas into the sample chamber. A gas pressure testing system, comprising a pressure detection unit for detecting a first pressure value at the bottom gas inlet and a second pressure value at the top gas outlet of the sample chamber, and a recording unit for recording the difference ΔP between the first pressure value and the second pressure value. as well as A pressure relief device is installed at the top of the sample chamber and is used to release pressure when the pressure inside the chamber exceeds a safety threshold.

2. The coke stacking permeability testing device according to claim 1, characterized in that: The upper part of the sample chamber is a cylindrical structure, and the bottom is a conical structure. The mesh support plate is installed at the junction of the cylindrical structure and the conical structure.

3. The coke stacking permeability testing device according to claim 1, characterized in that, The gas pressure testing system also includes: An inlet differential pressure transmitter is connected to the bottom of the sample chamber and is used to detect the first pressure value. An output differential pressure transmitter is connected to the top of the sample chamber and is used to detect the second pressure value. The long-view recorder is electrically connected to the inlet differential pressure transmitter and the outlet differential pressure transmitter, and is used to record and output the pressure difference ΔP.

4. The coke stacking permeability testing device according to claim 3, characterized in that, The gas pressure testing system also includes a U-tube manometer, the two ends of which are connected to the bottom and top of the sample chamber, respectively, for comparison and verification of pressure measurement with the inlet differential pressure transmitter and the outlet differential pressure transmitter.

5. The coke stacking permeability testing device according to claim 1, characterized in that, The pressure relief device includes: Unblock the pipeline, which is connected to the gas outlet at the top of the sample chamber; A vent valve, wherein the vent valve is installed on the unblocking pipeline; and A pressure gauge is installed on the unblocking pipeline and located at the front end of the venting valve to monitor the pressure at the top of the sample chamber in real time.

6. The coke stacking permeability testing device according to claim 1, characterized in that, The gas supply system includes a gas source, a regulating valve, and an electronic flow meter. The gas output from the gas source passes through the regulating valve and the electronic flow meter in sequence before being connected to the gas inlet at the bottom of the sample chamber.

7. The coke stacking permeability testing device according to claim 6, characterized in that, The air source is an air compressor or a high-pressure gas cylinder.

8. The coke stacking permeability testing device according to claim 1, characterized in that, The sample chamber is made of a transparent material.

9. The coke stacking permeability testing device according to claim 1, characterized in that, The top of the sample chamber is equipped with an openable and closable sealed top cover, which is sealed to the sample chamber by sealing bolts.

10. A method of using the coke stacking permeability testing device as described in any one of claims 1 to 9, characterized in that, Includes the following steps: S1: Prepare a coke sample. Crush and sieve representative coke into particles within a preset particle size range. Weigh a certain mass of coke sample and load it into the sample chamber. Ensure that the coke sample is evenly spread on the mesh support plate. Then, tighten the sealing top cover and seal it with sealing bolts. S2: Start the gas supply system, adjust the gas source output gas, control the gas pressure through the regulating valve, set and maintain a stable gas flow rate through the electronic flow meter, so that the gas enters the chamber at a uniform speed through the gas inlet at the bottom of the sample chamber. S3: After the gas flow stabilizes, start the gas pressure test system. The first pressure value at the gas inlet at the bottom of the sample chamber is detected by the differential pressure transmitter at the inlet port, and the second pressure value at the gas outlet at the top is detected by the differential pressure transmitter at the outlet port. The long graph recorder records and outputs the difference ΔP between the first and second pressure values ​​in real time. At the same time, the pressure difference ΔP is compared and verified by the U-tube manometer to ensure the accuracy of the measurement data. S4: During the testing process, the pressure at the top of the sample chamber is monitored in real time by the pressure gauge of the pressure relief device. When the pressure inside the chamber exceeds the safety threshold, the vent valve is opened to release the pressure and ensure the safe operation of the device. S5: Based on the recorded pressure difference ΔP and the set gas flow rate, combined with parameters such as the stacking height and cross-sectional area of ​​the coke sample, calculate the permeability coefficient of the coke under stacking conditions to complete the test of the permeability of the coke sample.

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