Temperature control device and method for coke oven gas heating combustion chamber

Abstract

The invention relates to the technical field of coke oven heating, in particular to a coke oven gas heating combustion chamber temperature control device and method.The coke oven gas heating combustion chamber temperature control device is characterized in that a gas main pipe adjusting unit is arranged at the front end of a single-hole combustion chamber adjusting unit and connected with a coke oven gas main pipe, and each single-hole combustion chamber adjusting unit is connected with the coke oven gas main pipe; the output end of each single-hole combustion chamber adjusting unit is connected with the corresponding combustion chamber. And the gas main pipe adjusting unit comprises an adjusting valve C, a flow meter and a pressure transmitter, and the adjusting valve C, the flow meter and the pressure transmitter are sequentially arranged on the coke oven gas main pipe. The device has the advantages that the regulating valve and the bypass regulating valve are arranged, so that a pore plate box can be completely replaced, the pore plate does not need to be manually replaced, and the risk that workers operate in dangerous areas such as a gas basement is reduced; by adopting a manual remote mode and manual control, the stability of the temperature of the combustion chamber at the initial stage of production or when the production load of the coke oven suddenly changes can be ensured.

Description

Technical Field

[0001] The invention relates to the technical field of coke oven heating, and in particular to a temperature control device and method for a coke oven gas heating combustion chamber. Background Art

[0002] The control of coke oven heating gas pressure and combustion chamber temperature plays a vital role in coke oven production. The traditional method is to ensure the stability of coke oven gas pressure by setting flow regulation and pressure alarm interlocking on the coke oven gas main pipe, while the temperature control of the combustion chamber is mainly achieved by manually replacing the orifice box of the coke oven heating gas branch pipe. In recent years, some people have tried to realize automatic control of combustion chamber temperature by adding regulating valves to each combustion chamber heating branch pipe. At present, the main method is to directly add a regulating valve to the regulating plug and the orifice box, or to directly control the regulating plug with an actuator. These methods all have the following problems: if the orifice box is retained, once the orifice size of the conventionally designed orifice is used in the orifice box, the regulating valve will be almost in a fully open state and completely lose its regulating function, which is equivalent to a switch valve. Therefore, only a large-size orifice can be specially ordered or the orifice box can be cancelled so that the regulating valve can play a regulating role. However, even so, since the regulating valve is directly installed on the combustion chamber heating gas branch pipe, taking the current mainstream 7m coke oven and 6.25 ramming coke oven as an example, the regulating valve size is usually DN100~DN125, so the regulating valve has too large flow capacity, and every 1° change will cause a significant change in furnace temperature. The accuracy of the regulating valve on the market is generally 1%~2%. The accuracy of the regulating valve under this caliber cannot accurately control the combustion chamber temperature at all. On the other hand, the operation of the branch regulating valve will inevitably bring about fluctuations in the gas main pressure, especially when the regulating valve is adjusted downward, the system resistance increases, and in severe cases it will cause low heating gas pressure and cause interlock parking. Currently, no one has proposed a solution in this regard. Summary of the invention

[0003] The purpose of the present invention is to provide a coke oven gas heating combustion chamber temperature control device and method, wherein regulating valve A and regulating valve B are respectively provided on regulating branch pipe 1 and regulating branch pipe 2 of the subsystem, a bypass regulating valve is provided between branch pipe a and branch pipe b, and the flow, pressure and combustion chamber temperature of the coke oven gas main pipe are measured to combine the flow and pressure control of the coke oven gas main pipe with the temperature control of the single-hole combustion chamber. Under the premise of ensuring the stability of the pressure of the coke oven gas main pipe, more precise control of the combustion chamber temperature can be achieved, thereby improving the production efficiency of the coke oven.

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

[0005] A coke oven gas heating combustion chamber temperature control device comprises a gas main regulating unit and a single-hole combustion chamber regulating unit. The gas main regulating unit is arranged at the front end of the single-hole combustion chamber regulating unit. The gas main regulating unit is connected to the coke oven gas main. Each single-hole combustion chamber regulating unit is connected to the coke oven gas main. The output end of each single-hole combustion chamber regulating unit is respectively connected to the corresponding combustion chamber. The gas main regulating unit comprises a regulating valve C, a flow meter, and a pressure transmitter. The regulating valve C, the flow meter, and the pressure transmitter are arranged on the coke oven gas main in sequence. The pressure transmitter is used to detect the pressure of the coke oven gas main.

[0006] Each single-hole combustion chamber adjustment unit includes an adjustment branch pipe 1, an adjustment branch pipe 2, a branch pipe, and a branch pipe b. The input ends of the adjustment branch pipe 1 and the adjustment branch pipe 2 are respectively connected to the coke oven gas main, and the output ends of the adjustment branch pipe 1 and the adjustment branch pipe 2 are respectively connected to the combustion chamber; one end of branch pipe a is connected to the adjustment branch pipe 1, the other end of branch pipe a is connected to the adjustment branch pipe 2, one end of branch pipe b is connected to the adjustment branch pipe 1, and the other end of branch pipe b is connected to the adjustment branch pipe 2.

[0007] The regulating branch pipe 1 includes a regulating cock A, a regulating valve A, and an exchange cock A which are sequentially connected from bottom to top, and the regulating branch pipe 2 includes a regulating cock B, a regulating valve B, and an exchange cock B which are sequentially connected from bottom to top;

[0008] The pipe connection of the regulating valve A and the exchange cock A is connected to one end of the branch pipe a, and the pipe connection of the regulating valve B and the exchange cock B is connected to the other end of the branch pipe a;

[0009] The pipeline connection of the regulating valve A and the regulating plug A is connected to one end of the branch pipe b, and the pipeline connection of the regulating valve B and the regulating plug B is connected to the other end of the branch pipe b; the branch pipe b includes a stop valve A and a stop valve B connected in series, one end of the bypass regulating valve is connected to the branch pipe a, and the pipeline connection of the stop valve A and the stop valve B is connected to the other end of the bypass regulating valve.

[0010] It also includes a connecting rod, an actuator, a positioner, a solenoid valve, a self-locking valve, and a temperature sensor. The two ends of the connecting rod are respectively connected to ball hinges, the crank of the regulating valve B is connected to the ball hinge at one end of the connecting rod, the crank of the regulating valve A is connected to the ball hinge at the other end of the connecting rod, the actuator is connected to the regulating valve B to drive the regulating valve B to operate, the positioner is connected to the actuator, the positioner is connected to the output end of the solenoid valve, the input end of the solenoid valve is connected to the air outlet of the self-locking valve, and the air inlet of the self-locking valve is connected to the air source; each temperature sensor is used to detect the temperature of the combustion chamber.

[0011] A method for controlling the temperature of a combustion chamber heated by coke oven gas, specifically comprising:

[0012] S1, loop A and loop B are backup for each other;

[0013] S2, coke oven gas main pressure and flow control;

[0014] S3, automatic temperature control of single-hole combustion chamber;

[0015] S4, single-hole combustion chamber heating gas pipeline bypass regulating valve control;

[0016] S5, single-hole combustion chamber heating gas pipeline main regulating valve control.

[0017] In S1, circuit A includes regulating plug A, stop valve A, and regulating valve A; circuit B includes regulating plug B, stop valve B, and regulating valve B. When circuit A is working, regulating plug B and stop valve B are closed, and regulating valve B moves with the actuator but does not play a regulating role. Only when circuit A fails, circuit B is switched, at which time stop valve A and regulating plug A are closed, and regulating plug B and stop valve B are opened.

[0018] In S2, the pressure and flow control of the coke oven gas main are adjusted by regulating valve C and flow meter, as follows:

[0019] 1) When the pressure of the coke oven gas main works within the set range, the opening of the regulating valve C is compared with the opening under normal working conditions. If the opening of the regulating valve C is consistent with the opening under normal working conditions, the regulating valve A is controlled by the temperature sensor; if the opening of the regulating valve C is too large, the regulating valve A of each single-hole combustion chamber regulating unit increases the opening by one gear at the same time; if the opening of the regulating valve C is too small, the regulating valve A of each single-hole combustion chamber regulating unit decreases the opening by one gear at the same time;

[0020] 2) When the pressure of the coke oven gas main is lower than the lower limit, the opening of the regulating valve FV is judged. If the opening of the regulating valve C is consistent with the opening under normal working conditions, the method returns to 1); if the opening of the regulating valve C is smaller than the opening under normal working conditions, the method returns to 1); if the opening of the regulating valve C is larger than the opening under normal working conditions, the regulating valve A of each single-hole combustion chamber regulating unit increases its opening by one level at the same time;

[0021] 3) When the pressure of the coke oven gas main pipe is lower than the lower limit, the solenoid valve of each single-hole combustion chamber regulating unit loses power, and the regulating valve A of each single-hole combustion chamber regulating unit opens; when the pressure of the coke oven gas main pipe returns to 1.1 times the set pressure, the solenoid valve of each single-hole combustion chamber regulating unit is energized, and the regulating valve A of each single-hole combustion chamber regulating unit returns to the state before the coke oven gas main pipe pressure is lower than the lower limit interlocking;

[0022] 4) Under normal operating conditions, the regulating valve A of each single-hole combustion chamber regulating unit is in the middle gear. Every time the gear of the regulating valve A changes, the regulating valve A is locked for a period of time through the corresponding self-locking valve so that the opening of the regulating valve A remains unchanged.

[0023] In S3, the temperature of the single-hole combustion chamber is automatically controlled: when the gas main pressure works within the set range, the regulating valve A and the bypass regulating valve of each single-hole combustion chamber regulating unit are controlled by temperature sensors respectively.

[0024] In S4, the bypass regulating valve of the single-hole combustion chamber heating gas pipeline is controlled: the bypass regulating valve of the single-hole combustion chamber heating gas pipeline is controlled by a PID control method according to the temperature sensor.

[0025] In S5, the main regulating valve of the single-hole combustion chamber heating gas pipeline is controlled as follows:

[0026] 1) When using remote manual mode

[0027] The opening of the regulating valve A of each single-hole combustion chamber regulating unit is manually input into the control system. When the combustion chamber temperature is within the target temperature range, the temperature is controlled by the bypass regulating valve; when the combustion chamber temperature cannot reach the target temperature, the control system will alarm, and the opening of the regulating valve A is manually set at this time;

[0028] 2) When using automatic control

[0029] It needs to be judged based on the combustion chamber temperature and the bypass regulating valve opening:

[0030] When the combustion chamber temperature is within the target temperature range, the opening of the regulating valve A does not change, and the temperature is controlled by the bypass regulating valve;

[0031] When the combustion chamber temperature cannot reach the target temperature, determine the opening of the bypass regulating valve:

[0032] If the bypass regulating valve is too open, increase the opening of regulating valve A by X. ’ , the formula is as follows:

[0033] X ’ =X+ΔX ①

[0034] In formula ①, ΔX is the change in opening, which is set in the control system; X is the current opening of the regulating valve;

[0035] If the bypass regulating valve opening is too small, reduce the opening of regulating valve A by X. ’ , the formula is as follows:

[0036] X ’ =X-ΔX②.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] 1. By setting a regulating valve and a bypass regulating valve in each combustion chamber subsystem (i.e., each single-hole combustion chamber regulating unit), the function of the orifice box can be completely replaced, and the orifice plate does not need to be replaced manually, which reduces the labor intensity and the risk of workers working in dangerous areas such as gas basements;

[0039] 2. The subsystem includes regulating branch pipe 1 and regulating branch pipe 2. The output ends of regulating branch pipe 1 and regulating branch pipe 2 are respectively connected to the combustion chamber. Loop A of regulating branch pipe 1 and loop B of regulating branch pipe 2 are backup for each other. When one of the loops fails, it can be switched to the backup loop at any time to ensure the stable control of the heating gas flow rate;

[0040] 3. A regulating valve A and a regulating valve B are respectively provided on the regulating branch pipe 1 and the regulating branch pipe 2 of the subsystem, and a bypass regulating valve is provided between the branch pipes a and b. The heating gas regulating branch regulating valve is controlled to achieve rough adjustment of the heating gas, and the bypass regulating valve is used to adjust the bypass flow of the heating gas to achieve fine adjustment of the combustion chamber temperature;

[0041] 4. The two ends of the connecting rod are connected to the ball hinge respectively. The crank of the regulating valve B is connected to the ball hinge at one end of the connecting rod, and the crank of the regulating valve A is connected to the ball hinge at the other end of the connecting rod, ensuring that the regulating valve A and the regulating valve B move together with the actuator and maintain the same opening. The structure is simple and the cost is saved.

[0042] 5. By measuring the flow, pressure and combustion chamber temperature of the coke oven gas main, the flow and pressure control of the coke oven gas main and the temperature control of the single-hole combustion chamber are combined. Under the premise of ensuring the stability of the coke oven gas main pressure, the combustion chamber temperature can be more accurately controlled, thereby improving the production efficiency of the coke oven;

[0043] 6. In the process of adjusting the furnace temperature of the combustion chamber, the branch pipe regulating valve and the bypass regulating valve are controlled by the combustion chamber temperature to avoid a large change in the opening of the branch pipe regulating valve and reduce the frequency of the change in the opening of the branch pipe regulating valve, thereby ensuring the stability of the pressure of the coke oven gas main and the combustion chamber temperature;

[0044] 7. When the gas main pressure is low, the main regulating valve and the branch regulating valves of each subsystem can stabilize the gas main pressure more quickly, reduce the number of interlocking stops, ensure the continuity of production, and improve economic benefits;

[0045] 8. The control of subsystem regulating valve A adopts two modes: manual remote control and automatic control. In manual remote control mode, it can ensure the stability of combustion chamber temperature in the initial stage of production or when the coke oven production load changes suddenly through manual control; after the coke oven production is stable and the temperatures of each combustion chamber are not much different, it will switch to automatic mode to ensure the accuracy of automatic adjustment of combustion chamber temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 Configuration diagram of the automatic control system for the coke oven gas heating system

[0047] Figure 2 This is a schematic diagram of the structure of a pneumatic regulating butterfly valve;

[0048] Figure 3 This is the process control flow chart of the coke oven gas heating system;

[0049] Figure 4 Logic flow chart of automatic control of coke oven gas main pressure.

[0050] Figure 5 Logic flow chart of automatic temperature control of single-hole combustion chamber.

[0051] In the figure: 1- coke oven gas main 2- regulating valve C 3- flow meter 4- pressure transmitter 5- regulating plug A 6- exchange plug A 7- regulating valve A 8- regulating plug B 9- regulating valve B 10- exchange plug B 11- bypass regulating valve 12- stop valve A 13- stop valve B 14- temperature sensor 15- crank 16- ball hinge 17- connecting rod 18- actuator 19- positioner 20- solenoid valve 21- self-locking valve. DETAILED DESCRIPTION

[0052] 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.

[0053] 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.

[0054] Example 1

[0055] A coke oven gas heating combustion chamber temperature control device, see Figure 1, a gas main pressure regulating unit and a single-hole combustion chamber temperature regulating unit. The gas main pressure regulating unit includes a coke oven gas main 1, a regulating valve C2, a flow meter 3, and a pressure transmitter 4. The regulating valve C2, the flow meter 3, and the pressure transmitter 4 are sequentially arranged on the coke oven gas main 1. The pressure transmitter 4 is used to detect the pressure of the coke oven gas main 1; the gas main pressure regulating unit is arranged at the front end of the single-hole combustion chamber temperature regulating unit. The single-hole combustion chamber temperature regulating unit is composed of multiple subsystems, all of which are connected to the coke oven gas main, and the output ends of the subsystems are respectively connected to the corresponding combustion chambers. The number of subsystems is consistent with the number of combustion chambers. A single single-hole combustion chamber temperature regulating unit includes a regulating plug A5, an exchange plug A6, a regulating valve A7, a regulating plug B8, a regulating valve B9, an exchange plug B10, a bypass regulating valve 11, a stop valve A12, a stop valve B13, and a temperature sensor 14. The subsystem includes a regulating branch pipe 1, a regulating branch pipe 2, a branch pipe a, and a branch pipe b; the regulating branch pipe 1 includes a regulating plug A5, a regulating valve A7, an exchange plug A6, and a regulating branch pipe connected in sequence from bottom to top. The second includes a regulating plug B8, a regulating valve B9, and an exchange plug B10 which are connected in sequence from bottom to top; the pipeline connection of the regulating valve A7 and the exchange plug A6 is connected to one end of the branch pipe a, and the pipeline connection of the regulating valve B9 and the exchange plug B10 is connected to the other end of the branch pipe a; the pipeline connection of the regulating valve A7 and the regulating plug A5 is connected to one end of the branch pipe b, and the pipeline connection of the regulating valve B9 and the regulating plug B8 is connected to the other end of the branch pipe b; the branch pipe b includes a stop valve A12 and a stop valve B13 connected in series, one end of the bypass regulating valve is connected to the branch pipe a, and the pipeline connection of the stop valve A12 and the stop valve B13 is connected to the other end of the bypass regulating valve.

[0056] Control valve A7 and control valve B8 are used to form a pneumatic control valve, see Figure 2 , including a connecting rod 17, an actuator 18, a positioner 19, a solenoid valve 20, a self-locking valve 21, and a temperature sensor 14. The two ends of the connecting rod 17 are respectively connected to the ball hinge 16. The crank 15 of the regulating valve B9 is connected to the ball hinge 16 at one end of the connecting rod 17. The crank 15 of the regulating valve A7 is connected to the ball hinge 16 at the other end of the connecting rod 17. The actuator 18 is connected to the regulating valve B9 to drive the regulating valve B9 to operate. The actuator 18 is a single-acting cylinder. The positioner 19 is connected to the actuator 1 8 is connected, the solenoid valve 20 is installed on the gas source pipeline of the positioner 19, the positioner 19 is connected to the output end of the solenoid valve 20, the input end of the solenoid valve 20 is connected to the air outlet of the self-locking valve 21, and the air inlet of the self-locking valve 21 is connected to the air source. When the solenoid valve is energized, the air source is turned on, and the regulating valve A7 and the regulating valve B9 work normally. When the solenoid valve 20 loses power and the air source is disconnected, the regulating valve A7 and the regulating valve B9 are maintained by the self-locking valve 21; each temperature sensor 14 is used to detect the temperature of the combustion chamber.

[0057] A method for controlling the temperature of a combustion chamber heated by coke oven gas, the contents of which are as follows:

[0058] The gas main pressure regulating unit adopts flow regulation. The flowmeter 3 and pressure transmitter 4 are installed after the regulating valve C2. The flowmeter 3 and the regulating valve C2 perform flow regulation. The pressure transmitter 4 is provided with gas pressure lower limit alarm, lower-lower limit alarm, interlock, and lower-lower limit alarm interlock. Among them, the lower-lower limit alarm and interlock are process interlocks, and the lower-lower limit interlock is to interlock the action of regulating valve A7 and regulating valve B9.

[0059] The working status of the subsystem is as follows: During normal production, the regulating plug A5 and the stop valve 12 are opened, the regulating plug B8 and the stop valve B13 are closed, and the regulating plug B8, the regulating valve B9 and the stop valve B13 are in standby mode. When the hydraulic switch operates for the first time, the exchange plug A6 is automatically opened and the exchange plug B10 is closed. At this time, the regulating plug A5, the exchange plug A6 and the regulating valve A7 are connected as the main circuit, and the regulation is achieved by the regulating valve A7. The regulating plug A5, the exchange plug A6, the bypass regulating valve 11 and the stop valve A12 are connected as the secondary circuit, and the regulation is achieved by the bypass regulating valve 11. After the hydraulic switch is reversed for a period of time, the exchange cock A6 is automatically closed and the exchange cock B10 is opened. At this time, the regulating cock A5, the regulating valve A7, and the exchange cock B10 are connected as the main circuit, and the regulation is realized by the regulating valve A7. The regulating cock A5, the exchange cock B10, the bypass regulating valve 11, and the stop valve A12 are connected as the secondary circuit, and the regulation is realized by the bypass regulating valve 11. When the regulating cock A5, the exchange cock A6, and the regulating valve A7 branch fail, the regulating cock A5 and the stop valve 12 are closed, and the regulating cock B8 and the stop valve B13 are opened. At this time, if the exchange cock A6 is opened and the exchange cock B8 is closed, the main circuit exchange cock A6, the regulating cock B8, and the regulating valve B9 are connected, and the regulating valve B9 participates in the regulation. The secondary circuit exchange cock A6, the regulating cock B8, the bypass regulating valve 11, and the stop valve B13 are connected, and the bypass regulating valve 11 participates in the regulation. On the contrary, if the exchange plug A6 is closed and the exchange plug B8 is opened, the main circuit regulating plug B8, regulating valve B9 and exchange plug B10 are turned on, and the regulating valve B9 participates in the regulation, and the auxiliary circuit regulating plug B8, exchange plug B10, bypass regulating valve 11 and stop valve A12 are turned on, and the bypass regulating valve 11 participates in the regulation.

[0060] See Figures 3 to 5 , FV represents the regulating valve C2, FT represents the flow meter 3, PT represents the pressure transmitter 4, XV represents the regulating valve A7 or the regulating valve B9, TV represents the bypass regulating valve 11, TE represents the temperature sensor 14. Because a coke oven consists of N combustion chambers, a set of coke oven gas heating combustion chamber temperature control devices has N XV, TV, TE, numbered XV-1~XV-N, TV-1~TV-N, TE-1~TE-N.

[0061] See Figure 3 , describes the process control method of the coke oven gas heating system, the control valve FV is controlled by the flow meter FT. When the gas main pressure is displayed as normal, the HS-1~HS-N selection switch (HS-1~HS-N is set in the PLC / DCS control system) is turned on in the ac direction, and each subsystem main circuit control valve XV-1~XV-N and bypass control valve TV-1~TV~N are controlled by the combustion chamber temperature sensor TE-1~TE~N respectively. At this time, XV, TV, TE constitute a single-hole combustion chamber temperature automatic control system. When the gas main pressure is displayed as abnormal, the HS-1~HS-N selection switch is turned on in the ab direction. At this time, XV-1~XV~N are controlled by PT at the same time, and are no longer controlled by TE-1~TE~N, but TV-1~TV~N are always controlled by TE~1~TE~N respectively. At this time, FT, FV, PT, XV-1~XV-N together constitute the gas main pressure automatic control system.

[0062] See Figure 4 , describes the automatic control method of the coke oven gas main pressure. The coke oven gas main pressure and flow are mainly adjusted by the coke oven gas main regulating valve FV and flowmeter. When the coke oven gas main pressure is normal, it is judged whether the opening of FV is normal. If the opening is normal, the regulating valves XV-1~XV-N are controlled by the temperature sensors of each combustion chamber respectively; if the opening of the regulating valve FV is too large, the regulating valves XV-1~XV-N will increase the opening by one gear at the same time and return to the main gas pressure judgment process; if the opening of the regulating valve FV is too small, the regulating valves XV-1~XV-N will reduce the opening by one gear at the same time and return to the main gas pressure judgment process. When the coke oven gas main pressure is lower than the lower limit, the system alarms and judges the opening of the regulating valve FV. If the opening is normal or small, it returns to the main gas pressure judgment process. If the opening is too large, the regulating valves XV-1~XV-N will increase the opening by one gear at the same time and return to the main gas pressure judgment process. When the pressure of the coke oven gas main is lower than the lower limit, the interlocking regulating valves XV-1 to XV-N are all opened. When the pressure of the coke oven gas main returns to 1.1 times the normal pressure, the regulating valves XV-1 to XV-N return to the state before the interlocking. Among them, the opening of the regulating valves XV-1 to XV-N can be set in multiple gears according to the actual situation. Try to keep them in the middle gear under normal working conditions. Every time the gear of XV-1 to XV-N changes, the opening will be locked for a period of time to remain unchanged. When the pressure of the coke oven gas main is interlocked at the lower and lower limits, the solenoid valves of XV-1 to XV-N lose power and the valves are closed. When it returns to 1.1 times the normal value, the solenoid valves are energized and the valves return to the opening before the interlocking.

[0063] See Figure 5 , describes the control of the main regulating valve of the single-hole combustion chamber heating gas pipeline, as follows:

[0064] 1) When using remote manual mode

[0065] The opening of the regulating valve A of each single-hole combustion chamber regulating unit is manually input into the control system. When the combustion chamber temperature is within the target temperature range, the temperature is controlled by the bypass regulating valve; when the combustion chamber temperature cannot reach the target temperature, the control system will alarm, and the opening of the regulating valve A is manually set at this time;

[0066] 2) When using automatic control

[0067] It needs to be judged based on the combustion chamber temperature and the bypass regulating valve opening:

[0068] When the combustion chamber temperature is within the target temperature range, the opening of the regulating valve A does not change, and the temperature is controlled by the bypass regulating valve;

[0069] When the combustion chamber temperature cannot reach the target temperature, determine the opening of the bypass regulating valve:

[0070] If the bypass regulating valve is too open, increase the opening of regulating valve A by X. ’ , the formula is as follows:

[0071] X ’ =X+ΔX ①

[0072] In formula ①, ΔX is the change in opening, which is set in the control system; X is the current opening of the regulating valve;

[0073] If the bypass regulating valve opening is too small, reduce the opening of regulating valve A by X. ’ , the formula is as follows:

[0074] X ’ =X-ΔX②.

[0075] The present invention can completely replace the function of the orifice box by arranging a regulating valve and a bypass regulating valve in each combustion chamber subsystem, and no longer needs to manually replace the orifice plate, thereby reducing labor intensity and reducing the risk of workers working in dangerous areas such as gas basements; the subsystem includes a regulating branch pipe 1 and a regulating branch pipe 2, and the output ends of the regulating branch pipe 1 and the regulating branch pipe 2 are respectively connected to the combustion chamber, and the circuit A of the regulating branch pipe 1 and the circuit B of the regulating branch pipe 2 are standby for each other. When a failure occurs in one of the circuits, it can be switched to the standby circuit at any time to ensure stable control of the flow rate of the heating gas; in the regulating branch of the subsystem, The pipe 1 and the regulating branch pipe 2 are respectively provided with regulating valve A and regulating valve B. A bypass regulating valve is provided between the branch pipes a and b. The heating gas regulating branch regulating valve is controlled to achieve rough adjustment of the heating gas. The bypass regulating valve is used to adjust the bypass flow of the heating gas to achieve fine adjustment of the combustion chamber temperature. The two ends of the connecting rod are respectively connected with ball hinges. The crank of the regulating valve B is connected to the ball hinge at one end of the connecting rod, and the crank of the regulating valve A is connected to the ball hinge at the other end of the connecting rod, so as to ensure that the regulating valve A and the regulating valve B act together with the actuator and maintain the same opening. The structure is simple and the cost is saved. By measuring the flow, pressure and combustion chamber temperature of the coke oven gas main, the coke oven gas main flow and pressure control are combined with the single-hole combustion chamber temperature control. Under the premise of ensuring the stability of the coke oven gas main pressure, more precise control of the combustion chamber temperature can be achieved, thereby improving the coke oven production efficiency. In the process of adjusting the combustion chamber temperature, the branch pipe regulating valve and the bypass regulating valve are controlled separately by the combustion chamber temperature to avoid large changes in the opening of the branch pipe regulating valve and reduce the frequency of changes in the opening of the branch pipe regulating valve, thereby ensuring the stability of the pressure of the coke oven gas main and the combustion chamber temperature. When the coal When the gas main pressure is low, the main regulating valve and the branch regulating valves of each subsystem can more quickly stabilize the gas main pressure, reduce the number of interlocking stops, ensure production continuity, and improve economic benefits; the control of subsystem regulating valve A adopts manual remote control and automatic modes. The manual remote control mode can ensure the stability of the combustion chamber temperature through manual control in the early stage of production or when the coke oven production load changes suddenly; after the coke oven production is stable and the temperatures of the combustion chambers are not much different, switch to automatic mode to ensure the accuracy of automatic adjustment of the combustion chamber temperature.

Claims

1. A coke oven gas heating combustion chamber temperature control device, characterized in that: It includes a gas main regulating unit and a single-hole combustion chamber regulating unit. The gas main regulating unit is arranged at the front end of the single-hole combustion chamber regulating unit. The gas main regulating unit is connected to the coke oven gas main. Each single-hole combustion chamber regulating unit is connected to the coke oven gas main. The output end of each single-hole combustion chamber regulating unit is respectively connected to the corresponding combustion chamber. The gas main regulating unit includes a regulating valve C, a flow meter, and a pressure transmitter. The regulating valve C, the flow meter, and the pressure transmitter are arranged on the coke oven gas main in sequence. The pressure transmitter is used to detect the pressure of the coke oven gas main.

2. A coke oven gas heating combustion chamber temperature control device according to claim 1, characterized in that: Each single-hole combustion chamber adjustment unit includes an adjustment branch pipe 1, an adjustment branch pipe 2, a branch pipe a, and a branch pipe b. The input ends of the adjustment branch pipe 1 and the adjustment branch pipe 2 are respectively connected to the coke oven gas main, and the output ends of the adjustment branch pipe 1 and the adjustment branch pipe 2 are respectively connected to the combustion chamber; one end of the branch pipe a is connected to the adjustment branch pipe 1, and the other end of the branch pipe a is connected to the adjustment branch pipe 2, one end of the branch pipe b is connected to the adjustment branch pipe 1, and the other end of the branch pipe b is connected to the adjustment branch pipe 2.

3. A coke oven gas heating combustion chamber temperature control device according to claim 2, characterized in that: The regulating branch pipe 1 includes a regulating cock A, a regulating valve A, and an exchange cock A which are sequentially connected from bottom to top, and the regulating branch pipe 2 includes a regulating cock B, a regulating valve B, and an exchange cock B which are sequentially connected from bottom to top; The pipe connection of the regulating valve A and the exchange cock A is connected to one end of the branch pipe a, and the pipe connection of the regulating valve B and the exchange cock B is connected to the other end of the branch pipe a; The pipeline connection of the regulating valve A and the regulating plug A is connected to one end of the branch pipe b, and the pipeline connection of the regulating valve B and the regulating plug B is connected to the other end of the branch pipe b; the branch pipe b includes a stop valve A and a stop valve B connected in series, one end of the bypass regulating valve is connected to the branch pipe a, and the pipeline connection of the stop valve A and the stop valve B is connected to the other end of the bypass regulating valve.

4. A coke oven gas heating combustion chamber temperature control device according to claim 3, characterized in that: It also includes a connecting rod, an actuator, a positioner, a solenoid valve, a self-locking valve, and a temperature sensor. The two ends of the connecting rod are respectively connected to ball hinges, the crank of the regulating valve B is connected to the ball hinge at one end of the connecting rod, the crank of the regulating valve A is connected to the ball hinge at the other end of the connecting rod, the actuator is connected to the regulating valve B to drive the regulating valve B to operate, the positioner is connected to the actuator, the positioner is connected to the output end of the solenoid valve, the input end of the solenoid valve is connected to the air outlet of the self-locking valve, and the air inlet of the self-locking valve is connected to the air source; each temperature sensor is used to detect the temperature of the combustion chamber.

5. A method for controlling the temperature of a combustion chamber heated by coke oven gas for implementing the device described in any one of claims 1 to 4, characterized in that: Specifically include: S1, loop A and loop B are backup for each other; S2, coke oven gas main pressure and flow control; S3, automatic temperature control of single-hole combustion chamber; S4, single-hole combustion chamber heating gas pipeline bypass regulating valve control; S5, single-hole combustion chamber heating gas pipeline main regulating valve control.

6. A method for controlling the temperature of a coke oven gas heating combustion chamber according to claim 5, characterized in that: In S1, circuit A includes regulating plug A, stop valve A, and regulating valve A; circuit B includes regulating plug B, stop valve B, and regulating valve B. When circuit A is working, regulating plug B and stop valve B are closed, and regulating valve B moves with the actuator but does not play a regulating role. Only when circuit A fails, circuit B is switched, at which time stop valve A and regulating plug A are closed, and regulating plug B and stop valve B are opened.

7. A method for controlling the temperature of a coke oven gas heating combustion chamber according to claim 5, characterized in that: In S2, the coke oven gas main pressure and flow control are adjusted by regulating valve C and flow meter, as follows: 1) When the pressure of the coke oven gas main works within the set range, the opening of the regulating valve C is compared with the opening under normal working conditions. If the opening of the regulating valve C is consistent with the opening under normal working conditions, the regulating valve A is controlled by the temperature sensor; if the opening of the regulating valve C is too large, the regulating valve A of each single-hole combustion chamber regulating unit increases the opening by one gear at the same time; if the opening of the regulating valve C is too small, the regulating valve A of each single-hole combustion chamber regulating unit decreases the opening by one gear at the same time; 2) When the pressure of the coke oven gas main is lower than the lower limit, the opening of the regulating valve FV is judged. If the opening of the regulating valve C is consistent with the opening under normal working conditions, the method returns to 1); if the opening of the regulating valve C is smaller than the opening under normal working conditions, the method returns to 1); if the opening of the regulating valve C is larger than the opening under normal working conditions, the regulating valve A of each single-hole combustion chamber regulating unit increases its opening by one level at the same time; 3) When the pressure of the coke oven gas main pipe is lower than the lower limit, the solenoid valve of each single-hole combustion chamber regulating unit loses power, and the regulating valve A of each single-hole combustion chamber regulating unit opens; when the pressure of the coke oven gas main pipe returns to 1.1 times the set pressure, the solenoid valve of each single-hole combustion chamber regulating unit is energized, and the regulating valve A of each single-hole combustion chamber regulating unit returns to the state before the coke oven gas main pipe pressure is lower than the lower limit interlocking; 4) Under normal operating conditions, the regulating valve A of each single-hole combustion chamber regulating unit is in the middle gear. Every time the gear of the regulating valve A changes, the regulating valve A is locked for a period of time through the corresponding self-locking valve so that the opening of the regulating valve A remains unchanged.

8. A method for controlling the temperature of a coke oven gas heating combustion chamber according to claim 5, characterized in that: In S3, the temperature of the single-hole combustion chamber is automatically controlled: when the gas main pressure works within the set range, the regulating valve A and the bypass regulating valve of each single-hole combustion chamber regulating unit are controlled by temperature sensors respectively.

9. A method for controlling the temperature of a coke oven gas heating combustion chamber according to claim 5, characterized in that: In S4, the single-hole combustion chamber heating gas pipeline bypass regulating valve is controlled: the single-hole combustion chamber heating gas pipeline bypass regulating valve is controlled by a PID control method according to a temperature sensor.

10. A method for controlling the temperature of a coke oven gas heating combustion chamber according to claim 5, characterized in that: In S5, the single-hole combustion chamber heating gas pipeline main regulating valve control is as follows: 1) When using remote manual mode The opening of the regulating valve A of each single-hole combustion chamber regulating unit is manually input into the control system. When the combustion chamber temperature is within the target temperature range, the temperature is controlled by the bypass regulating valve; when the combustion chamber temperature cannot reach the target temperature, the control system will alarm, and the opening of the regulating valve A is manually set at this time; 2) When using automatic control It needs to be judged based on the combustion chamber temperature and the bypass regulating valve opening: When the combustion chamber temperature is within the target temperature range, the opening of the regulating valve A does not change, and the temperature is controlled by the bypass regulating valve; When the combustion chamber temperature cannot reach the target temperature, determine the opening of the bypass regulating valve: If the bypass regulating valve is too open, increase the opening of regulating valve A by X. ’ , the formula is as follows: X ’ =X+ΔX ① In formula ①, ΔX is the opening change, which is set in the control system; X is the current opening of the control valve; If the bypass regulating valve opening is too small, reduce the opening of regulating valve A by X. ’ , the formula is as follows: X ’ =X-ΔX②。

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