A coking system for studying coking of multiple coal species under constant pressure environment

Abstract

The present application relates to the technical field of laboratory coking, and particularly relates to an experimental coking system for studying coking of multiple coal types under constant pressure environment, comprising a coking furnace, a heating mechanism arranged in the coking furnace for heating the coking furnace, a temperature control mechanism for controlling the temperature of the coking furnace, and a constant pressure mechanism for keeping the pressure in the inner cavity of the coking furnace at a set pressure, the coking furnace being a vertically arranged circular cylinder with closed two ends, the heating mechanism comprising an electric heating element arranged at the bottom of the coking furnace, the temperature control mechanism comprising a temperature controller arranged outside the coking furnace, the electric heating element being electrically connected to the temperature controller, the constant pressure mechanism being arranged outside the coking furnace and being in communication with the inner cavity of the coking furnace, and when the pressure in the coking furnace is greater than the set pressure, the constant pressure mechanism releases the pressure of the coking furnace to keep the pressure in the coking furnace constant. In the coking process, the inner cavity of the coking furnace is kept in a constant pressure state, which is conducive to studying the relationship between the quality of coke and the coking pressure under each set constant pressure.

Description

Technical Field

[0001] This invention relates to the field of laboratory coking technology, specifically to an experimental coking system for studying coking of multiple coal types under constant pressure. Background Technology

[0002] my country is a major producer, consumer, and exporter of coke. In industry, before coke production, coking experiments are conducted in small-scale experimental coke ovens to simulate the production coke oven. Correlation is established between the experimental coke oven and the production coke oven, so as to guide the coking coal blending based on the test results of the experimental coke oven and predict the results of the production coke oven.

[0003] Traditional experimental coke ovens have coal loading capacities ranging from 2 kg to 200 kg, with various specifications available, enabling both conventional and compacted coking. For example, Chinese patent CN113025347B discloses an experimental coke oven whose structure includes: a furnace body structure; a carbonization chamber disposed within the furnace body structure, the carbonization chamber having an inlet for coal input and an outlet for coke output; the upper top wall of the furnace body structure having a flue gas outlet communicating with the carbonization chamber for discharging flue gas; and a heating system disposed on the furnace body structure, the heating system including… The coke oven includes multiple heating devices surrounding the carbonization chamber. Each heating device has an independent temperature control, and its projection onto the upper top wall of the furnace structure is located at a position on the upper top wall where the flue gas outlet is not located. The flue gas outlet is located on the side of the upper top wall away from the furnace door frame. By setting multiple independently temperature-controlled heating devices around the carbonization chamber, the heating of the carbonization chamber can be adjusted, thereby achieving temperature control of various parts around the carbonization chamber. This allows the experimental coke oven to simulate the coking process of various types of coke ovens, effectively improving its versatility. However, this scheme cannot perform constant-pressure coking.

[0004] For example, the experimental coke oven disclosed in Chinese Patent No. CN 212174875U has the following structure: a furnace body; a partition wall disposed within the furnace body, which divides the space within the furnace body into multiple carbonization chambers; and heating devices for providing heat energy, which are respectively disposed within the partition wall and within the furnace wall of the furnace body. The multiple carbonization chambers are arranged in a straight line, and the furnace wall of the furnace body includes an innermost side wall, within which the heating devices are disposed, with the heating devices positioned opposite each other on both sides of the carbonization chambers. This experimental coke oven has multiple carbonization chambers, allowing for simultaneous coking tests. It enables simultaneous coking tests of multiple coal blending schemes, ensuring sufficient consistency of test conditions and improving comparability. However, this scheme also cannot perform constant-pressure coking. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide an experimental coking system for studying coking of multiple coal types under constant pressure, so as to solve the problem that existing experimental coke ovens cannot achieve constant pressure coking.

[0006] To solve the above-mentioned technical problems, the present invention adopts a basic solution as follows: an experimental coking system for studying coking of multiple coal types under constant pressure, comprising a coking oven, a heating mechanism disposed inside the coking oven for heating the coking oven, a temperature control mechanism for controlling the temperature of the coking oven, and a constant pressure mechanism for maintaining the pressure inside the coking oven at a set pressure. The coking oven is a vertically arranged, closed-end cylindrical body. The heating mechanism includes an electric heating element disposed at the bottom inside the coking oven. The temperature control mechanism includes a temperature controller disposed outside the coking oven. The electric heating element is electrically connected to the temperature controller. The constant pressure mechanism is disposed outside the coking oven and communicates with the inner cavity of the coking oven. When the pressure inside the coking oven is greater than the set pressure, the constant pressure mechanism releases pressure from the coking oven to maintain a constant pressure inside the coking oven.

[0007] Furthermore, the constant pressure mechanism includes a constant pressure tank, a first solenoid valve, a second solenoid valve, and a controller. The constant pressure tank includes a vertically arranged, closed-bottom cylinder, a sliding plate that is slidably and sealingly connected to the inner wall of the cylinder, a weight on the upper surface of the sliding plate, a first push-button switch on the inner bottom wall of the cylinder, and a second push-button switch on the upper side wall of the cylinder. The cylinder is fixedly connected above the coking oven. Pipe 1 and pipe 2 are provided on the cylinder. The upper end of pipe 1 communicates with the bottom inner cavity of the cylinder and the lower end of pipe 1 communicates with the inner cavity of the coking oven. One end of pipe 2 communicates with the bottom inner cavity of the cylinder and the other end of pipe 2 communicates with an external waste gas treatment mechanism. The first solenoid valve is provided on pipe 1 to control the opening / closing of pipe 1, and the second solenoid valve is provided on pipe 2 to control the opening / closing of pipe 2. The first push-button switch, the second push-button switch, the first solenoid valve, and the second solenoid valve are all electrically connected to the controller.

[0008] Furthermore, the constant pressure mechanism also includes a second constant pressure tank, a third solenoid valve, and a fourth solenoid valve. The second constant pressure tank includes a vertically arranged, closed-end cylindrical tank, a sliding plate that is slidably and sealingly connected to the inner wall of the second cylindrical tank, a second weight on the upper surface of the sliding plate, a third push-button switch on the inner bottom wall of the second cylindrical tank, and a fourth push-button switch on the upper side wall of the second cylindrical tank. The inner diameter of the second cylindrical tank is the same as that of the first cylindrical tank, and the weight of the second weight is the same as that of the first weight. The second cylindrical tank is positioned above the coking oven and fixedly connected to it. Pipes three and four are provided. The upper end of pipe three is connected to the bottom inner cavity of cylinder two, and the lower end of pipe three is connected to the inner cavity of the coking oven. One end of pipe four is connected to the bottom inner cavity of cylinder two, and the other end of pipe four is connected to an external waste gas treatment mechanism. A third solenoid valve is provided on pipe three to control the opening / closing of pipe three, and a fourth solenoid valve is provided on pipe four to control the opening / closing of pipe four. The third push switch, the fourth push switch, the third solenoid valve, and the fourth solenoid valve are all electrically connected to the controller.

[0009] Furthermore, the coking oven has a feeding port on its side wall for taking materials into and out of the coking oven's interior, and a door on its side wall for opening / closing the feeding port.

[0010] Furthermore, the heating element includes a silicon carbide rod and a resistance wire, the silicon carbide rod being axially arranged along the inner wall of the coking furnace, and the resistance wire being disposed at the bottom of the coking furnace.

[0011] Furthermore, both the constant pressure tank one and the constant pressure tank two are fixedly connected to the coking oven via fixed brackets.

[0012] The principles and beneficial effects of this invention are as follows:

[0013] After opening the box door and placing the prepared multi-type mixed coal into the coking oven, the box door is closed. At this time, under the gravity of weight block one and weight block two, slide plate one and slide plate two respectively contact the inner bottom wall of cylinder one and the inner bottom wall of cylinder two, and press to trigger the first and third press switches. The controller is set to control solenoid valve one to open pipe one, control solenoid valve two to close pipe two, control solenoid valve three to close pipe three, and control solenoid valve four to open pipe four when the second press switch is pressed. When pressed to trigger, the controller controls solenoid valve two to open pipe two, controls solenoid valve one to close pipe one, controls solenoid valve three to open pipe three, and controls solenoid valve four to close pipe four. When the third press switch is pressed to trigger, the controller controls solenoid valve one to close pipe one, controls solenoid valve three to open pipe three, and controls solenoid valve four to close pipe four. When the fourth press switch is pressed to trigger, the controller controls solenoid valve three to close pipe three, controls solenoid valve four to open pipe four, controls solenoid valve one to open pipe one, and controls solenoid valve two to close pipe two.

[0014] The temperature is set by a thermostat, and the silicon carbide rod and resistance wire are energized for heating. As heating progresses, the exhaust gas from the coal gradually accumulates, increasing the pressure inside the coking oven. When the pressure inside the coking oven reaches the set value, the sliding plate initially drives the first weight to slide upwards under the pressure. At this time, pipe three is blocked. Since the weight of the first weight is constant, the pressure inside the coking oven remains constant during the upward sliding of the sliding plate. When the sliding plate contacts and presses the second push switch, pipes one and four are blocked, while pipes two and three are opened. Under the gravity of the sliding plate, the exhaust gas inside cylinder one is discharged through pipe two to the exhaust gas treatment mechanism. The sliding plate gradually slides down until it contacts the bottom wall of cylinder one and triggers the first push switch. At this point, because pipe one is blocked, the inner cavity of cylinder one is isolated from the inner cavity of the coking oven. Therefore, the exhaust process of constant pressure tank one and constant pressure tank two does not affect the pressure change in the coking furnace cavity. During the downward movement of slide plate one, the pressure generated by the increased exhaust gas acts on slide plate two, causing slide plate two to slide upward. Since the inner diameter of cylinder one is equal to the inner diameter of cylinder two, and the weight of weight block one is equal to the weight of weight block two, the pressure in the coking furnace cavity does not change when the exhaust gas enters the lower cavity of cylinder two through pipe three. When slide plate one slides down and contacts the first pressing switch, pipe three is blocked, and pipe four opens to discharge the exhaust gas entering the cavity of cylinder two to the exhaust gas treatment device. At this time, the coking furnace cavity is also isolated from the cavity of cylinder two, and the exhaust of the cavity of cylinder two does not affect the pressure change in the coking furnace cavity. Similarly, when slide plate two rises and contacts the fourth pressing switch, pipe one and pipe four open, and pipe two and pipe three close, and the pressure in the coking furnace cavity is also not affected by the exhaust.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] 1) During the coking process, when the pressure tank 1 or the pressure tank 2 is depressurized, the inner cavity of the coking oven is not connected to the external waste gas treatment mechanism. This avoids pressure fluctuations in the inner cavity of the coking oven when the pressure tank 1 or the pressure tank 2 is depressurized, so that the inner cavity of the coking oven is kept at a constant pressure throughout the coking process. This is beneficial for studying the relationship between coke quality and coking pressure under various set constant pressures.

[0017] 2) The coking environment pressure inside the coking oven can be changed by changing the weight of weight one and weight two. The pressure setting is convenient and quick. Attached Figure Description

[0018] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0019] Figure 1 This is a structural schematic diagram of the present invention from the front view direction.

[0020] Figure 2 This is a top view of the present invention.

[0021] Figure 3 This is a schematic diagram of a constant pressure mechanism.

[0022] The meanings of the labels in the attached diagram are as follows:

[0023] Coke oven 10, feed inlet 101, box door 102, silicon carbide rod 103, resistance wire 104, temperature controller 105, constant pressure tank 1 20, cylinder 1 201, slide plate 1 202, weight 1 203, first press switch 204, second press switch 205, pipe 1 206, pipe 2 207, first solenoid valve 21, second solenoid valve 22, controller 23, constant pressure tank 2 30, cylinder 2 301, slide plate 2 302, weight 2 303, third press switch 304, fourth press switch 305, pipe 3 306, pipe 4 307, third solenoid valve 31, fourth solenoid valve 32, fixed bracket 40. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0026] This embodiment presents an experimental coking system for studying coking of multiple coal types under constant pressure, such as... Figures 1-3 As shown, the coking furnace includes a coking oven 10, a heating mechanism disposed within the coking oven 10 for heating the coking oven 10, a temperature control mechanism for controlling the temperature of the coking oven 10, and a constant pressure mechanism for maintaining the internal pressure of the coking oven 10 at a set pressure. The coking oven 10 is a vertically arranged, closed-end circular cylinder. The heating mechanism includes an electric heating element disposed at the bottom of the coking oven 10. The temperature control mechanism includes a temperature controller 105 disposed outside the coking oven 10. The electric heating element is electrically connected to the temperature controller 105. The constant pressure mechanism is disposed outside the coking oven 10 and communicates with the internal cavity of the coking oven 10. When the pressure inside the coking oven 10 is greater than the set pressure, the constant pressure mechanism releases pressure from the coking oven 10 to maintain a constant pressure inside the coking oven 10.

[0027] The coke oven 10 has a feeding port 101 on its side wall for loading and unloading materials into and out of its internal cavity, and a door 102 on its side wall for opening and closing the feeding port 101. It is understood that the door 102 can be fixed by screws, snap-fits, or any other means to ensure the sealing of the coke oven 10 during operation. The heating element includes a silicon carbide rod 103 and a resistance wire 104. Both the silicon carbide rod 103 and the resistance wire 104 are externally powered. The silicon carbide rod 103 is axially arranged along the inner wall of the coke oven 10, and the resistance wire 104 is located at the bottom of the coke oven 10.

[0028] The constant pressure mechanism includes a constant pressure tank 20, a first solenoid valve 21, a second solenoid valve 22, a second constant pressure tank 30, a third solenoid valve 31, a fourth solenoid valve 32, and a controller 23. The constant pressure tank 20 includes a vertically arranged, closed-bottom cylinder 201, a sliding plate 202 that is slidably and sealingly connected to the inner wall of the cylinder 201, a weight 203 disposed on the upper surface of the sliding plate 202, a first push switch 204 disposed on the inner bottom wall of the cylinder 201, and a second push switch 205 disposed on the upper side wall of the cylinder 201. The cylinder 201 is positioned above the coking furnace 10 and is fixedly connected to the coking furnace 10 via a fixed bracket 40. Pipe 206 and pipe 207 are disposed on the cylinder 201. The upper end of pipe 206 communicates with the bottom inner cavity of the cylinder 201, and the lower end of pipe 206 communicates with the inner cavity of the cylinder 201. The inner cavity of the coke oven 10 is open. Pipeline 206 is sealed and fixedly connected to the top plate of the coke oven 10. One end of pipe 207 is connected to the bottom inner cavity of cylinder 201, and the other end of pipe 207 is connected to an external waste gas treatment mechanism. Pipeline 207 is sealed and fixedly connected to the bottom plate of cylinder 201. The first solenoid valve 21 is installed on pipe 206 to control the opening / closing of pipe 206. The second solenoid valve 22 is installed on pipe 207 to control the opening / closing of pipe 207. The first push switch 204, the second push switch 205, the first solenoid valve 21, and the second solenoid valve 22 are all electrically connected to the controller 23. The first weight 203 is snapped onto the sliding plate 202 or otherwise detachably connected to facilitate the replacement of weights 203 of different weights.

[0029] The constant pressure tank 30 includes a vertically arranged cylindrical tank 301 with its lower end closed, a sliding plate 302 that is slidably and sealingly connected to the inner wall of the cylindrical tank 301, a weight 303 disposed on the upper surface of the sliding plate 302, a third push switch 304 disposed on the inner bottom wall of the cylindrical tank 301, and a fourth push switch 305 disposed on the upper side wall of the cylindrical tank 301. The inner diameter of the cylindrical tank 301 is the same as that of the cylindrical tank 201, and the weight of the weight 303 is the same as that of the weight 203. The cylindrical tank 301 is positioned above the coking furnace 10 and is fixedly connected to the coking furnace 10 by a fixed bracket 40. A pipe 306 and a... are disposed on the cylindrical tank 301. Pipeline 307 is connected to the coke oven 10. The upper end of pipe 306 is connected to the bottom inner cavity of cylinder 301, and the lower end of pipe 306 is connected to the inner cavity of cylinder 301. One end of pipe 307 is connected to the bottom inner cavity of cylinder 301, and the other end is connected to an external waste gas treatment mechanism. A third solenoid valve 31 is installed on pipe 306 to control its on / off state. A fourth solenoid valve 32 is installed on pipe 307 to control its on / off state. A third push-button switch 304, a fourth push-button switch 305, a third solenoid valve 31, and a fourth solenoid valve 32 are all electrically connected to the controller 23. Weight 203 is snapped onto sliding plate 202 or otherwise detachably connected to facilitate replacement of weights of different weights.

[0030] In operation, the multi-coal mixture prepared by the equipment is placed into the coking oven 10 after the box door 102 is opened, and then the box door 102 is closed. At this time, under the gravity of the first weight 203 and the second weight 303, the sliding plate 202 contacts the inner bottom wall of the first cylinder 201 and presses to trigger the first pressing switch 204, and the sliding plate 302 contacts the inner bottom wall of the second cylinder 301 and presses to trigger the third pressing switch 304. The system is configured such that when the first pressing switch 204 is pressed and triggered, or when both the first and third pressing switches 204 are triggered, the controller 23 controls the solenoid valve 1 to open pipe 206, controls the solenoid valve 2 to close pipe 207, controls the solenoid valve 3 to close pipe 306, and controls the solenoid valve 4 to open pipe 4 307; the system is configured such that when the second pressing switch 203 is pressed and triggered, the controller 23 controls the solenoid valve 2 to open pipe 206, controls the solenoid valve 2 to close pipe 207, controls the solenoid valve 3 to close pipe 306, and controls the solenoid valve 4 to open pipe 4 307. When switch 05 is pressed and triggered, controller 23 controls solenoid valve 2 to open pipe 2 207, controls solenoid valve 1 to close pipe 1 206, controls solenoid valve 3 to open pipe 3 306, and controls solenoid valve 4 to close pipe 4 307; when the third press switch 304 is pressed and triggered alone, controller 23 controls solenoid valve 1 to close pipe 1 206, controls solenoid valve 2 to open pipe 2 207, controls solenoid valve 3 to open pipe 3 306, and controls solenoid valve 4 to close pipe 4 307; when the fourth press switch 305 is pressed and triggered, controller 23 controls the third solenoid valve 31 to close pipe 3 306, controls solenoid valve 4 to open pipe 4 307, controls solenoid valve 1 to open pipe 1 206, and controls solenoid valve 2 to close pipe 2 207.

[0031] The temperature is set by the temperature controller 105, and the silicon carbide rod 103 and resistance wire 104 are energized for heating. As heating progresses, the exhaust gas from the coal gradually accumulates, causing the pressure inside the coke oven 10 to gradually increase. When the pressure inside the coke oven 10 reaches the set value, the pressure generated by the continued increase in exhaust gas inside the coke oven 10 causes the sliding plate 202 to start moving the weight 203 upward to increase the internal space of the coke oven 10 and reduce pressure. At this time, the pipe 306 is blocked. Since the gravity of the weight 203 is constant, the sliding plate 202 slides upward during this process. The internal pressure of the coking oven 10 remains constant. When slide plate 1 202 slides upward and contacts the second press switch 205, pipes 1 206 and 4 307 are blocked, while pipes 2 207 and 3 306 are opened. Under the gravity of slide plate 1 202, the exhaust gas inside cylinder 1 201 is discharged to the exhaust gas treatment mechanism through pipe 2 207. Slide plate 1 202 gradually slides down until it contacts the bottom wall of cylinder 1 201 and triggers the first press switch 204. At this time, because pipe 1 206 is blocked, the internal cavity of cylinder 1 201 is closed from the inside of the coking oven 10. The cavity is isolated, so the exhaust process of the constant pressure tank 20 does not affect the pressure change inside the coking furnace 10. During the downward movement of the sliding plate 202, the pressure generated by the increase in exhaust gas in the coking furnace 10 acts on the sliding plate 302, causing it to slide upward. Since the inner diameter of cylinder 201 is equal to that of cylinder 301, and the weight of weight 203 is equal to that of weight 303, the pressure inside the coking furnace 10 does not change when the exhaust gas enters the lower cavity of cylinder 301 through pipe 306. When the sliding plate 202 slides down and contacts the first push switch 204... Pipeline 306 and Pipeline 207 are blocked, while Pipeline 407 and Pipeline 106 are opened. The exhaust gas entering the inner cavity of cylinder 201 is discharged to the exhaust gas treatment device. At this time, the inner cavity of coking oven 10 is also isolated from the inner cavity of cylinder 201. The exhaust gas in the inner cavity of cylinder 201 does not affect the pressure change in the inner cavity of coking oven 10. Similarly, when slide plate 202 rises and contacts the fourth push switch 305, Pipeline 106 and Pipeline 407 are opened, while Pipeline 207 and Pipeline 306 are closed. The pressure in the inner cavity of coking oven 10 is also not affected by the exhaust gas.

[0032] Compared with the prior art, the beneficial effects of the present invention are:

[0033] 1) During the coking process, when the coking oven 10 is depressurized through constant pressure tank 20 or constant pressure tank 30, the inner cavity of the coking oven 10 is not connected to the external waste gas treatment mechanism. This avoids large fluctuations in the pressure inside the coking oven 10 when it is depressurized through constant pressure tank 20 or constant pressure tank 30, thus keeping the inner cavity of the coking oven 10 at a constant pressure. This is beneficial for studying the relationship between coke quality and coking pressure under various set constant pressures.

[0034] 2) The coking environment pressure inside the coking oven 10 can be changed by changing the weight of weight block 203 and weight block 303. The pressure setting is convenient and quick.

[0035] The above are merely embodiments of the present invention, and common knowledge regarding specific structures and characteristics in the solutions is not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. An experimental coking system for studying coking of multiple coal types under constant pressure, characterized in that: The coking furnace includes a coking oven, a heating mechanism disposed inside the coking oven for heating the coking oven, a temperature control mechanism for controlling the temperature of the coking oven, and a constant pressure mechanism for maintaining the pressure inside the coking oven at a set pressure. The coking oven is a vertically arranged, closed-end circular cylinder. The heating mechanism includes an electric heating element disposed at the bottom inside the coking oven. The temperature control mechanism includes a temperature controller disposed outside the coking oven. The electric heating element is electrically connected to the temperature controller. The constant pressure mechanism is disposed outside the coking oven and communicates with the inside of the coking oven. When the pressure inside the coking oven is greater than the set pressure, the constant pressure mechanism releases pressure from the coking oven to maintain a constant pressure inside the coking oven. The constant pressure mechanism includes a constant pressure tank, a first solenoid valve, a second solenoid valve, and a controller. The constant pressure tank includes a vertically arranged, closed-bottom cylinder, a sliding plate that is slidably and sealingly connected to the inner wall of the cylinder, a weight on the upper surface of the sliding plate, a first push-button switch on the inner bottom wall of the cylinder, and a second push-button switch on the upper side wall of the cylinder. The cylinder is fixedly connected above the coking furnace. Pipe 1 and pipe 2 are provided on the cylinder. The upper end of pipe 1 communicates with the bottom inner cavity of the cylinder and the lower end of pipe 1 communicates with the inner cavity of the coking furnace. One end of pipe 2 communicates with the bottom inner cavity of the cylinder and the other end of pipe 2 communicates with an external waste gas treatment mechanism. The first solenoid valve is provided on pipe 1 to control the opening / closing of pipe 1, and the second solenoid valve is provided on pipe 2 to control the opening / closing of pipe 2. The first push-button switch, the second push-button switch, the first solenoid valve, and the second solenoid valve are all electrically connected to the controller. The constant pressure mechanism further includes a second constant pressure tank, a third solenoid valve, and a fourth solenoid valve. The second constant pressure tank includes a vertically arranged, closed-bottom cylinder, a sliding plate that is slidably and sealingly connected to the inner wall of the second cylinder, a second weight on the upper surface of the sliding plate, a third push-button switch on the inner bottom wall of the second cylinder, and a fourth push-button switch on the upper side wall of the second cylinder. The inner diameter of the second cylinder is the same as that of the first cylinder, and the weight of the second weight is the same as that of the first weight. The second cylinder is positioned above the coking oven and fixedly connected to it. The second cylinder is equipped with... Pipes three and four are connected. The upper end of pipe three is connected to the bottom inner cavity of cylinder two, and the lower end of pipe three is connected to the inner cavity of the coking oven. One end of pipe four is connected to the bottom inner cavity of cylinder two, and the other end of pipe four is connected to an external waste gas treatment mechanism. A third solenoid valve is installed on pipe three to control the on / off state of pipe three. A fourth solenoid valve is installed on pipe four to control the on / off state of pipe four. The third push switch, the fourth push switch, the third solenoid valve, and the fourth solenoid valve are all electrically connected to the controller.

2. The experimental coking system for studying coking of multiple coal types under constant pressure environment as described in claim 1, characterized in that: The coking oven has a feeding port on its side wall for loading and unloading materials into and out of the oven's interior, and a door on its side wall for opening and closing the feeding port.

3. The experimental coking system for studying coking of multiple coal types under constant pressure environment as described in claim 2, characterized in that: The heating element includes a silicon carbide rod and a resistance wire. The silicon carbide rod is axially arranged along the inner wall of the coking furnace, and the resistance wire is disposed at the bottom of the coking furnace.

4. The experimental coking system for studying coking of multiple coal types under constant pressure environment as described in claim 3, characterized in that: Both the constant pressure tank one and the constant pressure tank two are fixedly connected to the coking oven via fixed brackets.

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