Pressure control system for gas collecting pipe of coke oven

Abstract

The invention relates to a coke oven gas collecting pipe pressure control system which comprises a first coke oven carbonization chamber and a second coke oven carbonization chamber, the second coke oven carbonization chamber and the first coke oven carbonization chamber are both communicated with one end of a gas collecting pipe through pressure control pipes, and the other end of the gas collecting pipe is communicated with one end of a gas-liquid separator; the pressure control pipe is used for controlling the amount of air entering the air collecting pipe, so that the pressure of the air collecting pipe is kept within a preset range; the other end of the gas-liquid separator is communicated with the input end of the primary cooler set, the output end of the primary cooler set is communicated with one end of the fan through a pipeline, the pipe wall of the pipeline is provided with a fan front control butterfly valve, and the other end of the fan is provided with a gas removal purification device. According to the invention, the fan front control butterfly valve is arranged at the front end of the fan, and the oven gas suction pipe butterfly valves are arranged in the gas collecting pipes of the first coke oven carbonization chamber and the second coke oven carbonization chamber, so that the gas inlet amount of the gas collecting pipes is controlled, and the pressure of the gas collecting pipes can be kept within a preset range, thereby improving the stability of the system.

Description

Technical Field

[0001] The invention relates to the technical field of coke oven gas collecting pipe pressure control, in particular to a coke oven gas collecting pipe pressure control system. Background Art

[0002] The function of the coke oven gas collector is to collect the gas from each carbonization chamber and recycle it through the fan after cooling. The gas collector pressure is an important control indicator that affects the quality of coke, gas production and the life of the coke oven. If the gas collector pressure is too low, the carbonization chamber will inhale air, causing coke combustion, affecting the life of the furnace body, reducing the quality of coke, and in serious cases endangering the safe operation of the blower; if the pressure is too high, the coke oven will leak smoke and fire, which will not only pollute the environment but also waste a lot of energy. In addition, the fire will reduce the heat intensity of the furnace column and shorten the life of the furnace.

[0003] The existing gas collecting pipe pressure control system still has the following technical problems when in use:

[0004] The current coke oven is TJL5550D tamping type, and the gas blower is 1400Nm 3 / min. According to the production situation, when the fan is running at rated frequency, the fan capacity is greatly surplus, and a large amount of capacity is wasted on the throttle valve, resulting in a waste of electricity and extremely uneconomical operation. At the same time, since the coke oven uses a high-pressure ammonia water coal loading and smoke elimination process, the original gas collecting pipe pressure control system controls the coke oven gas collecting pipe pressure through the operating power of the fan, and the adjustment ability is very poor, resulting in serious smoke in the coke oven. Summary of the invention

[0005] In order to solve the above problems, an object of the embodiments of the present invention is to provide a coke oven gas collecting pipe pressure control system.

[0006] A coke oven gas collecting pipe pressure control system, comprising:

[0007] Coke oven No. 1 carbonization chamber 1 and coke oven No. 2 carbonization chamber 2, said coke oven No. 2 carbonization chamber 2 and said coke oven No. 1 carbonization chamber 1 are both connected to one end of the gas collecting pipe 5 through a pressure control pipe, and the other end of said gas collecting pipe 5 is connected to one end of a gas-liquid separator 7; said pressure control pipe is used to control the amount of air entering the gas collecting pipe 5 so that the pressure of the gas collecting pipe is maintained within a preset range; the other end of said gas-liquid separator 7 is connected to the input end of a pre-cooler group, and the output end of said pre-cooler group is connected to one end of a fan 11 through a pipeline 9, and a fan front control butterfly valve 10 is provided on the pipe wall of said pipeline 9, and a degassing purification device 12 is provided at the other end of said fan 11.

[0008] Preferably, the pressure control pipe includes: a riser 3, one end of which is connected to the carbonization chamber 1 of the No. 1 coke oven, the other end of which is connected to one end of a bridge pipe 4, and the other end of the bridge pipe 4 is connected to the gas-liquid separator 7 through an intake pipe butterfly valve 6.

[0009] Preferably, the primary cooler group comprises four primary coolers 8 that are evenly arranged; and the fan (11) is a variable frequency fan.

[0010] Preferably, the pipe 9 is of a diameter of φ500.

[0011] Preferably, the pressure of the No. 1 coke oven carbonization chamber 1 and the No. 2 coke oven carbonization chamber 2 at the end of coking is 5Pa-20Pa.

[0012] Preferably, the height of the No. 1 coke oven carbonization chamber 1 and the No. 2 coke oven carbonization chamber 2 from the ground is controlled to be 5.5m, and the pressure of the gas collecting pipe 5 is 125Pa-145Pa.

[0013] The present invention also provides a coke oven gas collecting pipe pressure control method, comprising:

[0014] Step 1: high-temperature carbonization is performed on the coal in the No. 1 coke oven carbonization chamber 1 and the No. 2 coke oven carbonization chamber 2, and the raw coal gas generated in the high-temperature carbonization process is discharged into the bridge pipe 4 through the riser 3, and after being sprayed with ammonia water inside the bridge pipe 4 to cool down, it enters the gas collecting pipe 5;

[0015] Step 2: The treated raw gas enters the gas-liquid separator 7 through the gas collecting pipe 5 for centrifugal separation and wire mesh filtration. After the filtration is completed, the raw gas enters the interior of the primary cooler group for cooling;

[0016] Step 3: After being cooled in the primary cooler 8, the gas enters the gas removal purification device 12 through the pipeline 9 and is finally delivered to the gas user.

[0017] Preferably, in step 1, the temperature of the high-temperature carbonization is controlled at 900-1100 degrees Celsius.

[0018] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0019] The present invention relates to a coke oven gas collecting pipe pressure control system. Compared with the prior art, the present invention controls the air intake amount of the gas collecting pipe by arranging a fan front control butterfly valve at the front end of the fan, and arranging furnace air suction pipe butterfly valves inside the gas collecting pipes of the first coke oven carbonization chamber and the second coke oven carbonization chamber, so as to maintain the pressure of the gas collecting pipe within a preset range, thereby improving the stability of the system.

[0020] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 A schematic diagram of the structure of a coke oven gas collecting pipe pressure control system provided by the present invention;

[0023] Figure 2 This is the pressure curve of the gas collecting pipe before the frequency conversion is put into use;

[0024] Figure 3 This is the pressure curve of the gas collecting pipe after the frequency conversion is put into use.

[0025] In the figure: 1 No. 1 coke oven carbonization chamber, 2 No. 2 coke oven carbonization chamber, 3 riser, 4 bridge pipe, 5 gas collecting pipe, 6 suction pipe butterfly valve, 7 gas-liquid separator, 8 primary cooler, 9 pipeline, 10 fan front control butterfly valve, 11 fan, 12 degassing purification device. DETAILED DESCRIPTION

[0026] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0027] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0028] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] See also Figure 1 , a coke oven gas collecting pipe pressure control system, comprising:

[0030] The No. 1 coke oven carbonization chamber 1 and the No. 2 coke oven carbonization chamber 2, the No. 2 coke oven carbonization chamber 2 and the No. 1 coke oven carbonization chamber 1 are both connected to one end of the gas collecting pipe 5 through a pressure control pipe, and the other end of the gas collecting pipe 5 is connected to one end of a gas-liquid separator 7; the pressure control pipe is used to control the amount of air entering the gas collecting pipe 5 so that the pressure of the gas collecting pipe is maintained within a preset range; the other end of the gas-liquid separator 7 is connected to the input end of the pre-cooler group, and the output end of the pre-cooler group is connected to one end of a fan 11 through a pipeline 9, and a fan front control butterfly valve 10 is provided on the pipe wall of the pipeline 9, and a degassing purification device 12 is provided at the other end of the fan 11. The pre-cooler group includes four pre-coolers 8 evenly arranged.

[0031] Furthermore, the pressure control pipe includes: a riser 3, one end of which is connected to the carbonization chamber 1 of the No. 1 coke oven, the other end of which is connected to one end of a bridge pipe 4, and the other end of which is connected to the gas-liquid separator 7 through an air intake pipe butterfly valve 6.

[0032] It should be noted that the model of the pipeline 9 is a φ500 pipeline; the fan (11) is a variable frequency fan. The pressure of the No. 1 coke oven carbonization chamber 1 and the No. 2 coke oven carbonization chamber 2 at the end of coking is 5Pa-20Pa. The height of the No. 1 coke oven carbonization chamber 1 and the No. 2 coke oven carbonization chamber 2 from the ground is controlled to be 5.5m, and the pressure of the gas collecting pipe 5 is 125Pa-145Pa.

[0033] The present invention also provides a coke oven gas collecting pipe pressure control method, which is applied to the above coke oven gas collecting pipe pressure control system, comprising:

[0034] Step 1: First, the coal in the No. 1 coke oven carbonization chamber 1 and the No. 2 coke oven carbonization chamber 2 is subjected to high-temperature carbonization. The temperature of the high-temperature carbonization is controlled at 900-1100 degrees Celsius. The high-temperature raw coal gas generated in the high-temperature carbonization process is discharged into the bridge pipe 4 through the riser 3, and after being sprayed with ammonia water inside the bridge pipe 4 to cool down, it enters the gas collecting pipe 5;

[0035] Step 2: The gas enters the gas-liquid separator 7 from the gas collecting pipe 5, and the liquid in the gas is processed by centrifugal separation and screen filtration. After the processing is completed, the gas enters the interior of the primary cooler 8 from the gas-liquid separator 7 to cool the gas;

[0036] Step 3: After being cooled in the primary cooler 8, the gas enters the gas removal purification device 12 through the pipeline 9. A pipeline 9 is set between the primary cooler 8 and the gas removal purification device 12, and a fan 11 is set inside the pipeline 9. A fan control butterfly valve 10 is set before the fan 11 at the air inlet end, and finally it is delivered to the gas user.

[0037] Comparison of the air collecting pipe pressure control effect before and after the fan frequency conversion is put into use:

[0038] 1. Gas collecting pipe pressure before the fan frequency conversion is put into use: Before the fan frequency conversion modification, the coke oven gas collecting pipe pressure control uses a regulating butterfly valve control. The effect of controlling the gas collecting pipe pressure is as follows: Figure 2 It can be seen that the pressure of the gas collecting pipe controlled by it has frequent oscillation waves, which is neither convergent nor expanded. Whether the gas is relatively stable during the maintenance of the coke oven or the high-pressure ammonia water coal loading and smoke elimination process in production, the pressure curve of the gas collecting pipe has basically no obvious difference, that is, its control state is a balance of equal amplitude oscillation. However, in the operation of the same parameters, this balance often oscillates and expands, and the fluctuation is violent. The operation of the entire system is not very stable, resulting in serious smoke in the coke oven production.

[0039] 2. The pressure of the air collecting pipe after the fan frequency conversion is put into use: After the fan frequency conversion is put into use, the pressure fluctuation curve of the air collecting pipe becomes very regular. Figure 3 , this curve is the coal loading process of two coke ovens, followed by a period of coke oven maintenance time. In the curve, the first peak appears at the beginning of the coke oven coal loading operation. Due to environmental protection requirements, coal loading requires smoke elimination treatment. This peak is the fluctuation of the gas collecting pipe pressure caused by turning on the high-pressure ammonia smoke elimination. The pressure fluctuates slightly after the peak, which is the coal leveling operation process of coal loading. Then there is another trough. This trough is the operation of turning off the high-pressure ammonia smoke elimination after the coal loading is completed. Then there is a stable pressure curve, followed by the next coal loading process. The entire pressure fluctuation curve is repeated periodically with the coal loading and smoke elimination operation, and the system control is stable. During the coke oven maintenance, there is no high-pressure ammonia smoke elimination operation, and the gas collecting pipe pressure curve is very stable and gentle.

[0040] 3 Effect comparison and analysis:

[0041] (1) Effect comparison:

[0042] Although the gas collecting pipe pressure under frequency conversion control has an instantaneous peak and trough in a coke oven coal loading operation cycle, its amplitude is basically equivalent to the oscillation amplitude before the transformation, and because the peak time is short, the coke oven does not produce smoke. More importantly, when frequency conversion is controlled, the system is relatively stable as a whole and has a strong ability to adapt to production fluctuations. However, with the fluctuation of production, the full butterfly valve control system will often deteriorate in its adjustment effect, oscillation will expand, and smoke will occur. Analysis of peak and trough phenomena after frequency conversion control. In the bridge pipe of the coke oven riser, a large amount of smoke generated during the coal loading process is sucked into the gas collecting pipe by spraying high-pressure ammonia water, replacing the original operation of directly releasing the smoke from the riser into the atmosphere, thereby achieving the purpose of smoke elimination to reduce coke oven pollution. However, the disadvantage of high-pressure ammonia water coal loading smoke elimination is that it causes drastic fluctuations in the gas collecting pipe pressure and worsens the operation of the tar ammonia water separation tank. During the frequency conversion debugging, it was observed through the microcomputer display that when the high-pressure ammonia water smoke elimination was turned on, the pressure of the gas collecting pipe could rise from to within one second, and the change was quite drastic. During the parameter debugging process of the fan frequency conversion transformation, there was even a phenomenon of instantaneous high pressure breaking the riser cover. For energy saving considerations, during frequency conversion operation, the fan operating frequency is controlled by the gas collecting pipe pressure. During operation, the butterfly valve on the coke oven suction pipe is controlled to maintain a large opening and a small pressure drop. In this way, the total resistance of the fan is reduced and the energy saving efficiency is improved. When the high-pressure ammonia water smoke elimination is turned on, the large amount of flue gas generated needs to rapidly increase the pipeline's conveying capacity to ensure the stability of the gas collecting pipe pressure and the coke oven does not smoke or fire. There are only two ways to increase the pipeline's conveying capacity. One is to reduce the local pressure loss of the regulating valve, that is, to open the regulating valve opening, and the other is to increase the fan operation rate. Due to the large basic opening of the regulating valve during frequency conversion operation, according to the working characteristics of the butterfly valve, when the opening reaches a certain degree, its regulating ability will deteriorate, and the large-scale change of the opening will cause serious hysteresis and cannot meet the regulation function. For high voltage inverter, in order to maintain its normal operation,

[0043] The frequency converter has certain limitations on the frequency increase and decrease rate, so there is also a certain adjustment lag. In addition, there is a certain pipeline distance between the fan and the coke oven gas collecting pipe, and there is a lag in the pipeline pressure transmission and the inertia lag of the fan operation, which increases the lag of the fan frequency conversion adjustment. In this case, when the high-pressure ammonia water is turned on, the instantaneous fluctuation of the gas collecting pipe pressure is quite violent and large, which is equivalent to a violent rectangular interference wave, which cannot completely eliminate the impact on the feedback regulation system. Therefore, the peak and trough phenomenon of the gas collecting pipe pressure is unavoidable. The work of parameter debugging is how to maintain the stability of the control system and reduce the amplitude of the peak and trough. Analysis of oscillation waves when the fan is running at industrial frequency. When the fan is running at industrial frequency, use a fully regulating valve butterfly valve to control the gas collecting pipe pressure. The flow characteristics of the butterfly valve are approximately equal percentage flow characteristics when the opening is less than , and its regulation is relatively stable and gentle when the opening is small, and it is also more sensitive when the opening is large. However, due to the large fan matching capacity in design, when the power is turned on, in order to ensure a certain opening of the regulating valve, the valve in front of the fan is often opened very small to bear most of the pressure drop. As a result, when the regulating valve is fully opened, the ratio of the pressure difference on the valve to the total pressure difference of the fluid system is reduced, making the equal percentage flow characteristic of the butterfly valve become a nearly linear flow characteristic or even a fast opening flow characteristic. At a low opening,

[0044] If the regulating effect is too strong, oscillation is likely to occur. If the regulating effect is too weak at a large opening, the regulation is slow. Therefore, in order to suppress the peaks and troughs produced by high-pressure ammonia smoke elimination, it is often operated at a low opening. Since the regulating effect is too sensitive, an oscillating wave curve of the gas collecting pipe pressure appears during power frequency operation. When production is adjusted, the change in gas volume causes the basic opening of the regulating valve to change. If the valve opening in front of the fan is not adjusted accordingly to keep the regulating valve at the original basic opening, the regulating effect will often become slow or too sensitive due to the increase or decrease in the opening of the regulating valve, thereby deteriorating the regulating effect and causing the system to oscillate.

[0045] Selection of fan frequency conversion control scheme:

[0046] Since two coke ovens share one fan in the process, three regulating actuators are still required after the fan frequency conversion transformation, one is the fan frequency, and the other is the butterfly valve on the suction pipe of the two coke ovens, which is used to adjust the pressure balance of the two coke ovens. However, the relationship between the frequency conversion and the two butterfly valves and the primary and secondary functions of the adjustment should fully consider the adjustment accuracy of the adjustment device to achieve the ideal control state of the gas collecting pipe pressure. As mentioned above, it can be seen that the actuator of the butterfly valve is mechanical transmission control, and its control accuracy has a very important relationship with mechanical manufacturing. Moreover, its accuracy is inevitably affected by problems such as lubrication and wear during the operation of the machinery. In short, it can be observed during the debugging process that the action of the butterfly valve actuator has a certain step-by-step nature, and it can only act when a certain adjustment amount is reached, and the lag is quite obvious. When the adjustment amount is large, the lag of its adjustment is even greater. Compared with butterfly valves, frequency conversion regulation can be considered continuous, and it can achieve very precise regulation. Therefore, when selecting the control scheme, the control mode of using the gas collecting pipe pressure as the control parameter and the frequency conversion and butterfly valve in parallel was adopted. The scheme was mainly based on frequency conversion control and supplemented by butterfly valve control. The control butterfly valve of one of the coke ovens was even set to double. Small pipes were used to connect the machine-side gas collecting pipes of the two coke ovens to reduce the mutual coupling of the various regulating devices in the system.

[0047] Issues that should be noted when debugging fan frequency conversion:

[0048] 1. The problem of delayed pipeline pressure transmission:

[0049] From the previous process flow, we know that there is a certain pipeline distance from the fan to the gas collecting pipe of the coke oven, and it also passes through four high primary coolers. Therefore, there is a certain pressure transmission air resistance and air capacity in the entire pipeline.

[0050] When the pressure at a certain point in the system changes, before the system reaches a stable state, the pressure change at another point in the system is, where t is the time when the pressure at the other point changes to P, and T is the product of gas resistance and gas capacity.

[0051] This results in that when the fan speeds up, the suction force in front of the fan increases, and the pipe network in front of the fan is unstable in an instant. Only after a certain period of pressure transmission, the effect of the increased suction force in front of the fan can be reflected in the pressure of the gas collecting pipe, forming a stable airflow, and there is a lag in pressure transmission. Although the lag time is very short, it is unrealistic to completely suppress the impact of coal loading and smoke elimination on the gas collecting pipe pressure. Due to the existence of this lag, special attention should be paid when selecting the parameters of the frequency conversion. A slight increase in the regulation effect is likely to result in too small a system oscillation regulation effect, and the peak generated when the high-pressure ammonia water is turned on may increase, and even cause the pressure to break the riser cover.

[0052] Therefore, when selecting, the system oscillation and the peak amplitude of the gas collecting pipe pressure should be appropriately chosen. It is impossible to have the best of both worlds. In addition, when selecting the speed increase and decrease rate parameters in high-voltage frequency conversion, the faster the better. During the debugging process, if the parameter is set high, the pressure may not be significantly improved, but oscillation may occur.

[0053] Selection of PID parameters:

[0054] Due to the dramatic fluctuations in the gas collecting pipe pressure caused by high-pressure ammonia smoke elimination, various parameter combinations were tried during the parameter debugging process, but the results were not ideal. Either the peaks and troughs caused by the high-pressure ammonia were too large, or the stable pressure curve became a sawtooth shape when operating without smoke elimination.

[0055] After some observation and exploration, we abandoned one parameter adjustment method and used different parameters to adjust the gas collecting pipe pressure under different conditions through logical judgment. Since the programming function of the industrial control software used is very flexible, certain logical judgment parameters are set according to the pressure fluctuation curve, so that the microcomputer can identify the various processes of the coke oven operation through the pressure change situation and automatically use different parameters for control. In this way, the requirements for different control sensitivities of the gas collecting pipe pressure control in different operation stages of the coke oven are solved. Indeed, the high-pressure ammonia water smoke elimination has a huge impact on the gas collecting pipe pressure. When the debugging is finally completed, logical judgment parameters and different parameters are set for whether the smoke elimination operation is in progress, the upper band and lower band of the peak of the gas collecting pipe pressure curve when the high-pressure ammonia water is turned on during the smoke elimination operation, the flat coal stage, and the lower band and upper band of the trough of the gas collecting pipe pressure curve when the high-pressure ammonia water is turned off at the end of the smoke elimination. A total of more than a dozen parameters are set on the three gas collecting pipe pressure control loops, such as the fan frequency conversion and the coke oven suction pipe adjustment flap. In order to reduce the synergy among the three control loops, even one of the adjustment flaps is made to adopt double-position adjustment.

[0056] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technical solution that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A coke oven gas collecting pipe pressure control system, characterized in that: include: A No. 1 coke oven carbonization chamber (1) and a No. 2 coke oven carbonization chamber (2), wherein the No. 2 coke oven carbonization chamber (2) and the No. 1 coke oven carbonization chamber (1) are both connected to one end of a gas collecting pipe (5) through a pressure control pipe, and the other end of the gas collecting pipe (5) is connected to one end of a gas-liquid separator (7); the pressure control pipe is used to control the amount of air entering the gas collecting pipe (5) so that the pressure of the gas collecting pipe is maintained within a preset range; the other end of the gas-liquid separator (7) is connected to the input end of a pre-cooler group, and the output end of the pre-cooler group is connected to one end of a fan (11) through a pipeline (9), and a fan front control butterfly valve (10) is provided on the pipe wall of the pipeline (9), and a degassing purification device (12) is provided at the other end of the fan (11).

2. A coke oven gas collecting pipe pressure control system according to claim 1, characterized in that: The pressure control pipe comprises: a riser (3), one end of the riser (3) is connected to the carbonization chamber (1) of the first coke oven, the other end of the riser (3) is connected to one end of a bridge pipe (4), and the other end of the bridge pipe (4) is connected to the gas-liquid separator (7) via an air intake pipe butterfly valve (6).

3. A coke oven gas collecting pipe pressure control system according to claim 1, characterized in that: The primary cooler group comprises four primary coolers (8) that are evenly arranged; and the fan (11) is a variable frequency fan.

4. A coke oven gas collecting pipe pressure control system according to claim 1, characterized in that: The model selected for the pipeline (9) is a φ500 pipeline.

5. A coke oven gas collecting pipe pressure control system according to claim 1, characterized in that: The pressure of the No. 1 coke oven carbonization chamber (1) and the No. 2 coke oven carbonization chamber (2) at the end of coking is 5Pa-20Pa.

6. A coke oven gas collecting pipe pressure control system according to claim 1, characterized in that: The heights of the No. 1 coke oven carbonization chamber (1) and the No. 2 coke oven carbonization chamber (2) from the ground are controlled to be 5.5 m, and the pressure of the gas collecting pipe (5) is 125 Pa-145 Pa.

7. A coke oven gas collecting pipe pressure control method, characterized in that: include: Step 1: high-temperature carbonization is performed on the coal in the No. 1 coke oven carbonization chamber (1) and the No. 2 coke oven carbonization chamber (2), and the raw coal gas generated in the high-temperature carbonization process is discharged into the bridge pipe (4) through the riser (3), and after being sprayed with ammonia water inside the bridge pipe (4) to reduce the temperature, it enters the gas collecting pipe (5); Step 2: The treated raw gas enters the gas-liquid separator (7) from the gas collecting pipe (5) for centrifugal separation and screen filtration. After the filtration is completed, the raw gas enters the interior of the primary cooler group for cooling; Step 3: After being cooled in the primary cooler (8), the gas enters the gas removal purification device (12) through the pipeline (9) and is finally delivered to the gas user.

8. A coke oven gas collecting pipe pressure control method according to claim 7, characterized in that: In step 1, the temperature of high temperature carbonization is controlled at 900-1100 degrees Celsius.

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