Temperature adjusting method and system for coke oven gas heating single-hole combustion chamber

Abstract

The invention relates to the technical field of coke oven heating, in particular to a coke oven gas heating single-hole combustion chamber temperature adjusting method and system.The coke oven gas heating single-hole combustion chamber temperature adjusting method comprises the steps that each combustion chamber heating gas branch pipe is provided with a hole plate with the same size, and the size of each hole plate is 1 # smaller than that of a designed hole plate; parameters are manually input, and the working state of an adjusting valve of each combustion chamber heating gas branch pipe is confirmed according to an exchange cock signal; judging whether the actually measured temperature of each combustion chamber reaches the target temperature or not; judging whether the regulating valve breaks down or not; and for the regulating valve which does not reach the target temperature, if the regulating valve does not fail, the pore plate is replaced. The device has the advantages that the temperature of the combustion chamber is automatically adjusted by connecting the adjusting unit and the combustion chamber gas heating pipeline in parallel; the function of an original pore plate box is reserved, the adjusting valve is used for accurate temperature adjustment, and when the opening of the adjusting valve is too large or too small and cannot be adjusted, the opening of the adjusting valve is changed by changing a pore plate in the pore plate box; the size of the regulating valve is reduced, and the gas consumption of each regulating valve is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of coke oven heating, and in particular to a temperature regulating method and system for a single-hole combustion chamber heated by coke oven gas. Background Art

[0002] The temperature control of the coke oven combustion chamber is a key link in the coke oven heating technology. The traditional coke oven heating branch pipe adjustment design is composed of an adjustment cock, an exchange cock, an orifice box and a heating gas branch pipe. The method is that the staff controls the coke oven heating gas flow by changing the orifice size in the orifice box. Due to the limited orifice size, the adjustment accuracy is poor, and the number of coke oven combustion chambers is large, which requires experienced operators to operate frequently. The coke oven basement is also a dangerous area, and manual operation has safety hazards. Therefore, in recent years, a variety of heating gas automatic adjustment technologies have been born. There are two gas branch pipe adjustment cocks in each combustion chamber connected to an actuator through a connecting rod, and the gas flow is adjusted by adjusting the cock. The disadvantage of this method is that the flow characteristics of the adjustment cock are not good, it is difficult to adjust accurately, and the adjustment cock is not easy to move frequently and is easy to be damaged. There is also a switch valve added between the adjustment cock box and the orifice box, and the total amount of heating gas is controlled by pulse time. Since the switch valve is not easy to move frequently, the adjustment time is delayed and it is difficult to achieve accurate control. At present, the most mainstream practice is to add a regulating valve control directly between the regulating cock box and the exchange cock. However, due to the large size of the regulating valve, the orifice box must select a large-sized orifice plate, otherwise the regulating range of the regulating valve will be very small, thus losing the regulating function. This means that the orifice box cannot be used together with the regulating valve. Even if the orifice box is cancelled or a larger orifice plate is replaced, the size of the regulating valve determines that its control accuracy can only cope with large load fluctuations and cannot accurately adjust the combustion chamber temperature. In other words, the regulating valve only replaces the orifice box to achieve the function of coarse adjustment, and on-site operators are often more willing to be familiar with the use of the orifice box. After all, the setting of the orifice box is the accumulation of decades of production experience, and the regulating valve eventually becomes a "decoration". Moreover, these methods all have the disadvantages of large investment, large gas consumption, and the inability to disassemble the regulating valve when it fails. Summary of the invention

[0003] The purpose of the present invention is to provide a temperature control method and system for a single-hole combustion chamber heated by coke oven gas. While retaining the original function of the orifice box, branch pipe regulating valves are added on both sides of the orifice box to achieve accurate regulation of the combustion chamber temperature, while saving costs, reducing energy consumption, reducing maintenance difficulty, improving regulation efficiency and quality, and ensuring safe and stable operation of the regulation system.

[0004] To achieve the above object, the present invention is implemented through the following technical solutions:

[0005] A method for regulating the temperature of a single-hole combustion chamber heated by coke oven gas, comprising the following steps:

[0006] S1. Number the orifice plates in the orifice plate box in order from small to large;

[0007] S2. Each combustion chamber heating gas branch pipe is equipped with orifice plates of the same size, and the orifice plate size is one size smaller than the designed orifice plate;

[0008] S3, manually input parameters, the parameters include the orifice plate number of each combustion chamber heating gas branch pipe and the target temperature of each combustion chamber;

[0009] S4. According to the reversing signal sent by the control system (each time the reversing signal is sent, the exchange cocks A and B will be opened and closed alternately. Only when the exchange cock is opened, the regulating valve will play a regulating role. The regulating valve determines which regulating valve plays a regulating role according to the reversing signal), confirm the working status of the regulating valve of each combustion chamber heating gas branch pipe, and manage the regulating valves in working status in turn;

[0010] S5, judging whether the measured temperature of each combustion chamber reaches the target temperature. If the target temperature is reached, the regulation of the regulating valve in the working state is effective and no manual intervention is required;

[0011] S6. For the regulating valve that has not reached the target temperature, determine whether the regulating valve is faulty. If the regulating valve is faulty, purge or disassemble the regulating valve for repair. After the repair and purge, return to S5.

[0012] S7. For the regulating valve that has not reached the target temperature, if the regulating valve has not failed, determine the opening of the regulating valve. If the opening of the regulating valve is too large, replace the orifice plate with a larger size. If the opening of the regulating valve is too small, replace the orifice plate with a smaller size.

[0013] S8, manually troubleshoot the combustion chamber heating gas branch pipe that needs to replace the orifice plate, and repeat S5-S7 after the fault is eliminated;

[0014] S9. If the opening of the regulating valve is still too large or too small, replace the orifice plate with a larger size and repeat S5-S7.

[0015] In S1, the orifice box includes N kinds of orifice plates, and the diameters of the orifice plates are d0, d0+1, ..., di-1, di, ...dN-1, dN (mm) from small to large. The diameter of each orifice plate differs by 1mm. If the design orifice plate size is di, the installation orifice plate size should be di-1. If the heating gas main pressure remains unchanged, the adjustable flow range of the regulating valve of the heating gas branch pipe of each combustion chamber is: the flow difference between the design orifice plate and the installation orifice plate.

[0016] The adjustable flow range of the regulating valve of each combustion chamber heating gas branch pipe is calculated according to the design value of the heating gas main flow Q0, the diameter D of the combustion chamber heating gas branch pipe, the design orifice plate diameter d0, and the number N of combustion chambers:

[0017] Combustion chamber heating gas branch flow

[0018] Combustion chamber heating gas branch flow rate

[0019] Orifice resistance

[0020] In formula ③, K is based on It can be found from the table that ρ0 is the gas density under standard conditions, and t is the gas temperature;

[0021] Combustion chamber heating gas branch pipe pressure P0=P-ΔP ④

[0022] Assuming that the heating gas main pressure P remains unchanged, the diameter of the installation orifice is d0′

[0023] Orifice resistance

[0024] K′ according to Find it by looking up the table;

[0025] Combustion chamber heating gas branch pressure P0′=P-ΔP′ ⑥

[0026] According to the flow-pressure relationship, we can get

[0027] The relationship between the combustion chamber heating gas branch pipe flow rate q′ and the combustion chamber heating gas branch pipe flow velocity w0′ is as follows:

[0028]

[0029] The combined equations ①~⑧ can be used to obtain the corresponding flow rate q′ of the combustion chamber heating gas branch pipe when the installation orifice plate is d0′;

[0030] The differential pressure before and after the regulating valve can be estimated according to the pressure loss of the designed orifice plate. The algorithm is formula ③. At this time, the adjustable flow range of the regulating valve of the combustion chamber heating gas branch pipe is as follows:

[0031] q max =k*(q0-q′) ⑨

[0032] In Equation ⑨, k is the threshold coefficient, and its range is 1.1 to 1.3. Select a control valve based on the maximum flow rate and the differential pressure before and after the control valve.

[0033] In S6, when the signal of the currently working control valve is disconnected, the difference between the feedback signal and the output signal of the control valve > 5%, and the feedback signal does not change for a long time, it is determined that the control valve has a fault.

[0034] In S7, if the following conditions are simultaneously met: the control valve has no fault; the opening of the control valve > 90°; T1 + X < T0 (T1 is the detected temperature, T0 is the set temperature, X is the manually set value, and the range of X is 3 to 10 °C); and the conditions are met and the duration t does not disappear, it is determined that the opening of the control valve is too large, and replace the orifice plate with a size one larger (M = M' + 1);

[0035] If the following conditions are simultaneously met: the control valve has no fault; the opening of the control valve < 10°; the detected temperature T1 - X > T0; the conditions are met and the duration t does not disappear, it is determined that the opening of the control valve is too small, and replace the orifice plate with a size one smaller (M = M' - 1).

[0036] In S8, if after the fault is eliminated, the alarm signal for replacing the orifice plate disappears, then the orifice plate size is reset to the original orifice plate size, that is, M = M'; if the interlock signal still exists after the fault is eliminated, then replace the orifice plate on-site, and the actual orifice plate size M' corresponding to this control valve is updated to the recommended orifice plate size M, that is, M' = M, and at the same time, the interlock signal is automatically reset.

[0037] In S8, manual troubleshooting includes that the exchange cock is not fully opened, the orifice plate is not clean, the pipes before and after the orifice plate are blocked, and the nozzle is coated with tar and naphthalene.

[0038] The single-hole combustion chamber temperature control system for coke oven gas heating includes an adjustment unit. One end of each adjustment unit is connected to the main heating gas pipe, and the other end of each adjustment unit is connected to the corresponding combustion chamber.

[0039] The adjustment unit includes the first combustion chamber heating gas branch pipe and the second combustion chamber heating gas branch pipe. The first combustion chamber heating gas branch pipe and the second combustion chamber heating gas branch pipe are connected in parallel. Adjusting devices are provided on both the first combustion chamber heating gas branch pipe and the second combustion chamber heating gas branch pipe. Each adjusting device includes a gas adjustment branch pipe, an exchange cock, an adjusting cock, and an orifice plate box. The adjusting cock, the orifice plate box, and the exchange cock are connected in sequence from bottom to top. The gas adjustment branch pipe is connected in parallel with the orifice plate box, and a control valve is provided on the gas adjustment branch pipe.

[0040] The number of adjusting devices is 2N, where N is the number of combustion chambers.

[0041] Compared with the prior art, the beneficial effects of the present invention are:

[0042] 1. By connecting the regulating unit in parallel with the combustion chamber gas heating pipeline, while retaining the original function of the orifice box, regulating valves are added on both sides of the orifice box to improve the temperature adjustment effect;

[0043] 2. The function of the original orifice box is retained. When the regulating valve opening is too large or too small to be adjusted, the operator can change the opening of the regulating valve by changing the orifice plate in the orifice box. The operation is simple and easy to implement.

[0044] 3. Each coke oven has a large number of regulating valves in the regulating unit. The regulating valves are installed on small-sized pipelines in parallel with the gas mains, which greatly reduces the diameter of each regulating valve and significantly reduces the direct economic cost.

[0045] 4. Reduce the size of the regulating valve, so that the gas consumption of each regulating valve is reduced, and energy consumption is greatly reduced;

[0046] 5. The regulating valve is installed on a small-sized pipeline in parallel with the gas main. There is no need to directly connect the regulating valve with the regulating cock and the exchange cock, which solves the problem of limited installation space and reduces the difficulty of valve manufacturing and installation;

[0047] 6. Through comprehensive analysis of the detected temperature of each combustion chamber and the feedback opening of the regulating valve, it has the function of automatically reminding the operator to replace the orifice box or overhaul it. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 This is the overall schematic diagram of the coke oven gas branch pipe regulating device.

[0049] Figure 2 It is a flow chart of the combustion chamber temperature regulation method.

[0050] Figure 3 It is the orifice replacement warning and valve fault detection logic control diagram.

[0051] Figure 4 It is a schematic diagram of the flow range of the branch pipe regulating valve.

[0052] Figure 5 It is a schematic diagram of the combustion chamber temperature regulation management and monitoring panel.

[0053] In the figure: 1-combustion chamber heating gas branch pipe 2-exchange cock 3-regulating cock 4-orifice box 5-stop valve 6-stop valve 7-gas regulating branch pipe 8-purge valve 9-regulating valve. DETAILED DESCRIPTION

[0054] The present invention is described in detail below in conjunction with the accompanying drawings, but it should be noted that the implementation of the present invention is not limited to the following embodiments.

[0055] The following examples are implemented on the premise of the technical solution of the present invention, and provide detailed implementation methods and specific operation processes, but the protection scope of the present invention is not limited to the following examples. The methods used in the following examples are conventional methods unless otherwise specified.

[0056] Example 1

[0057] Taking a single-heat-chamber 65-hole carbonization-chamber coke oven as an example, there are 66 combustion chambers in total, and each combustion chamber corresponds to 2 sets of gas regulating branches, so the gas regulating branches are equipped with 132 sets of regulating devices in total.

[0058] A coke oven gas heating single-hole combustion chamber temperature control system, see Figure 1 , including a regulating unit, one end of each regulating unit is connected to the heating gas main pipe, and the other end of each regulating unit is connected to the corresponding combustion chamber; the regulating unit includes a combustion chamber heating gas branch pipe 1-1 and a combustion chamber heating gas branch pipe 1-2, the combustion chamber heating gas branch pipe 1-1 and the combustion chamber heating gas branch pipe 1-2 are connected in parallel, and the combustion chamber heating gas branch pipe 1-1 and the combustion chamber heating gas branch pipe 1-2 are both provided with a regulating device, each regulating device includes a gas regulating branch pipe 7, an exchange cock (2), a regulating cock (3), and an orifice box (4), the regulating cock (3), the orifice box (4), and the exchange cock (2) are connected in sequence from bottom to top, the gas regulating branch pipe 7 is connected in parallel with the orifice box 4, and a stop valve 5, a regulating valve, and a stop valve 6 are provided in sequence on the gas regulating branch pipe 7, and a purge valve 8 is provided at the pipeline connection between the stop valve 5 and the regulating valve 9.

[0059] Orifice box (4) set see Figure 4 , assuming that 8 types of orifice box boxes are designed in the orifice box (4), and the sizes are numbered from 1# to 8# in ascending order, and the commonly used orifice plate number is 6#, so the size of the inserted orifice plate should be one size smaller than the designed orifice plate, that is, orifice plate No. 5; according to the coke oven operation experience, the orifice plate with a diameter difference of 1mm affects the furnace temperature of the combustion chamber by 20~25℃, so the change of gas flow rate that affects the furnace temperature of the combustion chamber by 20~25℃ is the precise adjustment range of the regulating valve. According to formulas ①~⑧, the flow range of the regulating valve can be calculated, and the formula is as follows:

[0060] According to the design value of heating gas main flow Q0, the diameter of combustion chamber heating gas branch pipe D, the design orifice plate diameter d0, and the number of combustion chambers N, the following parameters are obtained in sequence:

[0061] Combustion chamber heating gas branch flow

[0062] Combustion chamber heating gas branch flow rate

[0063] Orifice resistance

[0064] In formula ③, K is based on It can be found from the table that ρ0 is the gas density under standard conditions, and t is the gas temperature;

[0065] Combustion chamber heating gas branch pipe pressure P0=P-ΔP ④

[0066] Assuming that the heating gas main pressure P remains unchanged, the diameter of the installation orifice is d0′

[0067] Orifice resistance

[0068] K′ according to Find it by looking up the table;

[0069] Combustion chamber heating gas branch pressure P0′=P-ΔP′ ⑥

[0070] According to the flow-pressure relationship, we can get

[0071] The relationship between the combustion chamber heating gas branch pipe flow rate q′ and the combustion chamber heating gas branch pipe flow velocity w0′ is as follows:

[0072]

[0073] The combined equations ①~⑧ can be used to obtain the corresponding flow rate q′ of the combustion chamber heating gas branch pipe when the installation orifice plate is d0′;

[0074] The differential pressure before and after the regulating valve can be estimated according to the pressure loss of the designed orifice plate. The algorithm is formula ③. At this time, the adjustable flow range of the regulating valve of the combustion chamber heating gas branch pipe is as follows:

[0075] q max =k*(q0-q′) ⑨

[0076] In formula ⑨, k is the threshold coefficient, ranging from 1.1 to 1.3; select the regulating valve based on the maximum flow rate and the differential pressure before and after the regulating valve.

[0077] If the diameter difference between adjacent orifice plates is larger, the flow rate of the regulating valve 9 will be larger, and the selected regulating valve 9 caliber will also become larger, which will increase the cost and reduce the regulating accuracy. Therefore, the adjacent orifice plates are generally only allowed to differ by 1 mm.

[0078] See Figure 5 , the combustion chamber temperature regulation management monitoring panel example explains this method in detail.

[0079] During normal production, the regulating cock 3, stop valve 5, and stop valve 6 are all in the open state, and the purge valve 8 is in the closed state. When the exchange cock 2 of the combustion chamber heating gas branch pipe 1 is opened, the exchange cock 2 of the combustion chamber heating gas branch pipe 1 is in the closed state, and the regulating valve 9 of all the combustion chamber heating gas branch pipes 1 corresponding to the 1~66# combustion chambers is in the working state, and the regulating valve 9 of the combustion chamber heating gas branch pipe 1 is in the non-working state. Figure 5 On the heating regulation monitoring panel, the working status, target temperature, measured temperature, regulating valve status, current orifice plate size, and recommended orifice plate size of the combustion chamber heating gas branch pipe 1 of 1~66#A line are displayed; while the working status, target temperature, measured temperature, and valve status of the combustion chamber heating gas branch pipe 1 of 1~66#B line are all gray and invalid, and only the current orifice plate size and recommended orifice plate size are displayed on the panel. When the exchange cock 2 of the combustion chamber heating gas branch pipe 1 is closed, the exchange cock 2 of the combustion chamber heating gas branch pipe 1 is in the open state, and the regulating valve 9 of all the combustion chamber heating gas branch pipes 1 corresponding to 1~66# combustion chambers is in the non-working state, and the regulating valve 9 of the combustion chamber heating gas branch pipe 1 is in the working state; the working state, target temperature, measured temperature, valve state, current orifice plate size, and recommended orifice plate size of the combustion chamber heating gas branch pipe 1 of 1~66#B line are displayed on the heating regulation monitoring panel; while the working state, target temperature, measured temperature, and valve state of the gas branch pipe of the combustion chamber heating gas branch pipe 1 of 1~66#A line are all in gray and invalid state, and only the current orifice plate size and recommended orifice plate size are displayed on the panel.

[0080] When the regulating valve 9 participates in automatic regulation, the target temperature should be set first. Figure 5, the target temperature of the 1# combustion chamber is set to 1200℃, and the actual temperature is 1199℃. At this time, the actual temperature is close to the target temperature and the regulating valve is displayed as normal, indicating that the automatic adjustment of the heating gas branch pipe 1 of the 1# combustion chamber is effective. The actual temperature of the 2# combustion chamber is 1185℃, which is much lower than the target temperature. Without changing the target temperature and without fault in the adjustment, if the opening of the regulating valve is always above 90% for a long time, it means that the orifice size is too small, the heating gas is insufficient, and the regulating valve is already in an unadjustable state. At this time, the valve status shows that the opening is too large, and it is recommended that the orifice size be automatically changed to No. 6. The actual temperature of the 15# combustion chamber is 1215℃, which is much higher than the target temperature. Without changing the target temperature and without fault in the regulating valve, if the opening of the regulating valve is always below 10% for a long time, it means that the orifice size is too large, the heating gas is excessive, and the regulating valve is already in an unadjustable state; at this time, the regulating valve status shows that the opening is too small, and it is recommended that the orifice size be automatically changed to No. 4. When the warning message of replacing the orifice plate is displayed, the maintenance personnel should first be arranged to check some common faults of the coke oven heating system. Common faults include the exchange plug not opening properly, the orifice plate is not clean, the pipes before and after the orifice plate are blocked, and the nozzle is hung with tar naphthalene. If the fault information is found and repaired, the measured temperature will gradually approach the target temperature, and the opening of the regulating valve 9 will return to the normal opening. At this time, the control system will automatically judge and automatically reset the recommended orifice plate size to the current orifice plate size; if no fault is found or after troubleshooting, the regulating valve opening is still too large or too small and the target temperature cannot be reached, the orifice plate in the orifice box should be manually replaced. After replacement, click Confirm on the management monitoring panel. At this time, the current orifice plate size is updated to the recommended orifice plate size, and the system logic alarm function will be automatically reset. When 2# and 15# combustion chamber heating gas branch pipe 1- shows that it is recommended to replace the orifice plate, although combustion chamber heating gas branch pipe 1-2 is not working at this time, since combustion chamber heating gas branch pipe 1- and # combustion chamber heating gas branch pipe 1-2 work alternately and have the same resistance most of the time, the monitoring panel branch 2 will also generate an early warning of recommending replacement of the orifice plate at the same time. If the orifice plate of combustion chamber heating gas branch pipe 1-2 is not actually replaced, there is no need to click the confirmation button. When combustion chamber heating gas branch pipe 1-2 is working, if the measured temperature returns to the target temperature, the size shown in the column of the recommended replacement of the orifice plate of combustion chamber heating gas branch pipe 1-2 will automatically reset to the current orifice plate size. The gas branch system of the 31# combustion chamber shows a regulating valve failure. Although the measured temperature is inconsistent with the target temperature, the system will not give a suggestion to replace the orifice plate, but needs to repair the faulty regulating valve. If the regulating valve is blocked, the purge valve (8) can be opened to introduce purge steam; if replacement or disassembly for maintenance is required, the stop valve 5 and stop valve 6 can be closed and then directly disassembled. At this time, temporary adjustment can be made through the orifice box. When the valve failure is eliminated, the system automatically enters the logic judgment.

[0081] The present invention can realize automatic regulation of the combustion chamber temperature by connecting the regulating unit in parallel with the combustion chamber gas heating pipeline; the function of the original orifice box is retained, and the regulating valve is used as a precise temperature regulator. When the regulating valve opening is too large or too small to be regulated, the opening of the regulating valve can be changed by changing the orifice plate in the orifice box; the regulating valves of the regulating unit of each coke oven are large in number, and the regulating valves are installed on a small-sized pipeline in parallel with the gas main pipe, so that the caliber of each regulating valve is greatly reduced, and the direct economic cost is greatly reduced; the size of the regulating valve is reduced, so that the gas consumption of each regulating valve is reduced, and the energy consumption is greatly reduced; the regulating valve is installed on a small-sized pipeline in parallel with the gas main pipe, and there is no need to directly connect the regulating valve with the regulating cock and the exchange cock, which solves the problem of limited installation space and reduces the difficulty of valve manufacturing and installation; through comprehensive analysis of the detected temperature of each combustion chamber and the feedback opening of the regulating valve, it has the function of automatically reminding the operating worker to replace the orifice box or overhaul.

Claims

1. A method for regulating the temperature of a single-hole combustion chamber heated by coke oven gas, characterized in that: The specific steps include: S1. Number the orifice plates in the orifice plate box in order from small to large; S2. Each combustion chamber heating gas branch pipe is equipped with orifice plates of the same size, and the orifice plate size is one size smaller than the designed orifice plate; S3, manually input parameters, the parameters include the orifice plate number of each combustion chamber heating gas branch pipe and the target temperature of each combustion chamber; S4. According to the reversing signal sent by the control system, confirm the working state of the regulating valve of each combustion chamber heating gas branch pipe, and manage the regulating valves in working state in turn; S5, judging whether the measured temperature of each combustion chamber reaches the target temperature. If the target temperature is reached, the regulation of the regulating valve in the working state is effective and no manual intervention is required; S6. For the regulating valve that has not reached the target temperature, determine whether the regulating valve is faulty. If the regulating valve is faulty, purge or disassemble the regulating valve for repair. After the repair and purge, return to S5. S7. For the regulating valve that has not reached the target temperature, if the regulating valve has not failed, determine the opening of the regulating valve. If the opening of the regulating valve is too large, replace the orifice plate with a larger size. If the opening of the regulating valve is too small, replace the orifice plate with a smaller size. S8, manually troubleshoot the combustion chamber heating gas branch pipe that needs to replace the orifice plate, and repeat S5-S7 after the fault is eliminated; S9. If the opening of the regulating valve is still too large or too small, replace the orifice plate with a larger size and repeat S5-S7.

2. A method for regulating the temperature of a single-hole combustion chamber heated by coke oven gas according to claim 1, characterized in that: In S1, the orifice box includes N kinds of orifice plates, and the diameters of the orifice plates are d0, d0+1, ..., di-1, di, ...dN-1, dN (mm) from small to large, and the diameter of each orifice plate differs by 1 mm. If the design orifice plate size is di, the installation orifice plate size should be di-1. If the heating gas main pipe pressure remains unchanged, the adjustable flow range of the regulating valve of the heating gas branch pipe of each combustion chamber is: the flow difference between the design orifice plate and the installation orifice plate.

3. The method for regulating the temperature of a single-hole combustion chamber heated by coke oven gas according to claim 2, characterized in that: The adjustable flow range of the regulating valve of each combustion chamber heating gas branch pipe is obtained in turn according to the design value Q0 of the heating gas main flow, the diameter D of the combustion chamber heating gas branch pipe, the design orifice plate diameter d0, and the number N of combustion chambers: Combustion chamber heating gas branch flow Combustion chamber heating gas branch flow rate Orifice resistance In formula ③, K is based on It can be found from the table that P0 is the gas density under standard conditions, and t is the gas temperature; Combustion chamber heating gas branch pressure P0=P-ΔP ④ Assuming that the heating gas main pressure P remains unchanged, the diameter of the installation orifice is d0′ Orifice resistance K′ according to Find it by looking up the table; Combustion chamber heating gas branch pressure P0′=P-ΔP′⑥ According to the flow-pressure relationship, we can get The relationship between the combustion chamber heating gas branch pipe flow rate q′ and the combustion chamber heating gas branch pipe flow velocity w0′ is as follows: The combined equations ①~⑧ can be used to obtain the corresponding flow rate q′ of the combustion chamber heating gas branch pipe when the installation orifice plate is d0′; The differential pressure before and after the regulating valve can be estimated according to the pressure loss of the designed orifice plate. The algorithm is formula ③. At this time, the adjustable flow range of the regulating valve of the combustion chamber heating gas branch pipe is as follows: q max =k*(q0-q′) ⑨ In formula ⑨, k is the threshold coefficient, ranging from 1.1 to 1.3; select the regulating valve based on the maximum flow rate and the differential pressure before and after the regulating valve.

4. The method for regulating the temperature of a single-hole combustion chamber heated by coke oven gas according to claim 1, characterized in that: In S6, when the signal of the currently operating regulating valve is interrupted, the difference between the feedback signal and the output signal of the regulating valve > 5%, and the feedback signal no longer changes for a long time, it is determined that the regulating valve has a fault.

5. The method for regulating the temperature of a single-hole combustion chamber heated by coke oven gas according to claim 1, characterized in that: In S7, if the following conditions are simultaneously met: the regulating valve has no fault; the opening degree of the regulating valve > 90°; T1 + X < T0 (T1 is the detected temperature, T0 is the set temperature, X is the manually set value, and the range of X is: 3 - 10 °C); and the conditions are met and the duration t does not disappear, it is determined that the opening degree of the regulating valve is too large, and the orifice plate size is changed to the next larger size (M = M'+1); If the following conditions are simultaneously met: the regulating valve has no fault; the opening degree of the regulating valve < 10°; the detected temperature T1 - X > T0; the conditions are met and the duration t does not disappear, it is determined that the opening degree of the regulating valve is too small, and the orifice plate size is changed to the next smaller size (M = M' - 1).

6. The method for regulating the temperature of a single-hole combustion chamber heated by coke oven gas according to claim 1, characterized in that: In S8, if the orifice plate replacement alarm signal disappears after the fault is eliminated, the orifice plate size is reset to the original orifice plate size, i.e., M = M'; if the interlock signal still exists after the fault is eliminated, the orifice plate is replaced on-site, and the actual orifice plate size M' corresponding to the regulating valve is updated to the recommended orifice plate size M, i.e., M' = M, and the interlock signal is automatically reset at the same time.

7. The method for regulating the temperature of a single-hole combustion chamber heated by coke oven gas according to claim 1, characterized in that: In S8, the manual troubleshooting includes that the exchange cock is not fully opened, the orifice plate is not clean, the pipes before and after the orifice plate are blocked, and the nozzle is coated with tar and naphthalene.

8. A coke oven gas heating single-hole combustion chamber temperature control system for implementing the method described in claims 1-7, characterized in that: It includes a regulating unit, one end of each regulating unit is connected to the main heating gas pipe, and the other end of each regulating unit is connected to the corresponding combustion chamber.

9. A coke oven gas heating single-hole combustion chamber temperature control system according to claim 8, characterized in that: The regulating unit includes the first combustion chamber heating gas branch pipe and the second combustion chamber heating gas branch pipe. The first combustion chamber heating gas branch pipe and the second combustion chamber heating gas branch pipe are connected in parallel. Adjusting devices are provided on both the first combustion chamber heating gas branch pipe and the second combustion chamber heating gas branch pipe. Each adjusting device includes a gas regulating branch pipe, an exchange cock, an adjusting cock, and an orifice plate box. The adjusting cock, the orifice plate box, and the exchange cock are connected in sequence from bottom to top. The gas regulating branch pipe is connected in parallel with the orifice plate box, and a regulating valve is provided on the gas regulating branch pipe.

10. A coke oven gas heating single-hole combustion chamber temperature control system according to claim 8, characterized in that: The number of the adjusting devices is 2N, where N is the number of combustion chambers.

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