A blast furnace gas feedforward regulation heating system and regulation method for a large coke oven

Abstract

The present application provides a blast furnace gas feedforward regulation heating system and regulation method for a large coke oven, which comprises a gas main pipe, a combustion chamber gas main pipe system, a combustion chamber gas branch pipe system and a supplementary air system. The combustion chamber gas main pipe system comprises a gas main pipe, a plug, a first flow restrictor and a waste gas on-off device. The combustion chamber gas branch pipe system comprises a gas branch pipe, an on-off valve, a second flow restrictor, a regulating plug and a lower injection pipe. The supplementary air system comprises a compressed air pipe, a compressed air branch pipe, an on-off valve and a flow restrictor. The gas in the gas main pipe is heated by the combustion chamber gas main pipe system and the combustion chamber gas branch pipe system respectively before entering the regenerative chamber, and then is supplied to the combustion chamber to form a double-channel gas supply. The present application can improve the coking production efficiency and meet the requirements of high efficiency, energy saving and environmental protection for coking production.

Description

TECHNICAL FIELD

[0001] The present application relates to coking production technology, and in particular to a blast furnace gas feedforward regulation heating system and regulation method for a large coke oven. BACKGROUND

[0002] A large coke oven refers to a coke oven with a carbonization chamber higher than 6m and a carbonization chamber volume larger than 40m 3 A large coke oven is generally heated by blast furnace gas (hereinafter referred to as gas) and coke oven gas. A coke oven is composed of about 110-130 carbonization chambers. The carbonization chambers and combustion chambers are arranged along the longitudinal direction of the coke oven. A combustion chamber is composed of 15-20 groups of vertical flues. Each carbonization chamber and combustion chamber is below a corresponding regenerator. Each regenerator is composed of a gas regenerator and an air regenerator. The gas regenerator and the air regenerator are separated by a main partition wall, and the gas regenerator and the air regenerator are separated by a single wall. In order to ensure equal distribution of gas flow in the longitudinal direction of the regenerator, the regenerator is divided into several sub-areas by a wall arranged every two vertical flues. The main partition wall of the regenerator is provided with a coke oven gas brick passage equal to the number of vertical flues. Each gas brick passage is connected to a vertical flue of the combustion chamber. The gas regenerator and the air regenerator are divided into a regenerative area and a flue by a grate brick. The regenerative area is filled with regenerative checker bricks. The flue is connected to a waste gate outside. The gas regenerator and the air regenerator are provided with inclined passages connected to each vertical flue of the combustion chamber. The waste gate of the gas regenerator is connected to a gas pipe and a branch flue. The waste gate of the air regenerator is connected to the atmosphere and a branch flue. The gas enters the gas regenerator through the waste gate for heat exchange. The air enters the air regenerator through the waste gate for heat exchange. The exchanged gas and air enter the combustion chamber for combustion. The combustion waste gas is cooled to 260-350℃ through the regenerator for heat exchange and is discharged to the flue through the waste gate. The waste gates of the regenerators are connected by a reversing link mechanism to simultaneously reverse the flow direction of the gas, air and flue gas. The reversing period is generally set to 20-30 minutes. The temperature of the vertical flue of the combustion chamber is generally controlled at 1250-1350℃. The coal is dried, melted, and semi-solidified to form coke. When the center temperature of the coke cake reaches 950℃ or above, the coke cake is pushed out by a coke pusher and sent to the coke extinguishing system. The coking time of the carbonization chamber of a large coke oven is about 20-25 hours. At present, the coke oven gas heating system supplies gas to the combustion chamber at a constant flow rate during the production process of the coke oven.

[0003]

[0004] The thermal physical parameters of the coal charge in the carbonization chamber change in the drying, melting and semi-coke solidification stages, which causes the heat transfer from the furnace wall to the coal charge and the heat transfer between the coal charges to be unsteady in a coking cycle. The heat transfer from the furnace wall to the coal charge is unsteady and decreases in a coking cycle. The heat transfer from the furnace wall to the coal charge is greater than the heat generated by the combustion of the coal gas in the combustion chamber at the initial stage of the coking cycle, which causes the temperature of the furnace wall to decrease and the coking speed to slow down. The heat demand of the coke cake is less than the heat generated by the combustion of the coal gas in the combustion chamber at the end of the coking cycle, which causes the temperature of the outlet flue gas and the coke cake to increase and the heat generated by the combustion of the coal gas to be wasted. The coking and pushing of the coke in the carbonization chamber are carried out in a sequence according to the characteristics of the coke oven, and the coking time of the carbonization chamber on the two sides of the combustion chamber is different. The purpose is to reduce the difference between the heat demands of the carbonization chambers on the two sides of the combustion chamber and balance the heat supply in the coking process of the coke oven. For example, the standard fireway temperature of the combustion chamber of a coke oven with a 2-1 pushing sequence fluctuates periodically, and the fluctuation amplitude is about 50 DEG C and the period is 1 / 2 of the coking cycle. Obviously, reducing the temperature fluctuation is beneficial to increasing the heating speed of the coal charge and reducing the energy consumption. However, the existing coke oven heating system and the structure of the coke oven do not have the means and the possibility to adjust the coal gas flow of each combustion chamber according to the fluctuation of the standard fireway temperature. Therefore, the coal gas flow of the combustion chamber is supplied in a fixed amount at present.

[0005] The carbonization chambers on the machine side and the coke side have different widths, and the heat supply of each vertical fireway of the combustion chamber is different, and the coal gas flow of each vertical fireway of the combustion chamber increases in turn along the machine side and the coke side. The adjusting bricks of the grate bricks of the regenerator or the flue adjusting plate are usually used to adjust the coal gas flow of each regenerative zone. The adjusting means has a large adjusting workload, a poor control precision and a low sensitivity. SUMMARY

[0006] The purpose of the present application is to solve the problem that the coke oven gas heating system lacks adjusting means when the temperature of the transverse wall of the combustion chamber fluctuates periodically, and a high-precision feedforward adjusting heating system for the blast furnace gas of a large coke oven is provided. The system can simultaneously solve the problems of low adjusting precision and low sensitivity of the blast furnace gas supply of the vertical fireway of the combustion chamber, improve the coking production efficiency, and meet the requirements of high efficiency, energy saving and environmental protection of the coking production.

[0007] To achieve the above purpose, the technical scheme adopted by the present application is as follows: a high-precision feedforward adjusting heating system for the blast furnace gas of a large coke oven, which comprises a coal gas main pipe, a combustion chamber coal gas main pipe system, a combustion chamber coal gas branch pipe system and a supplementary air system.

[0008] The combustion chamber gas main pipe system comprises a gas main pipe, a plug, a first flow restrictor, and a waste gas on-off device, the combustion chamber gas branch pipe system comprises a gas branch pipe, an on-off valve, a second flow restrictor, an adjusting plug, and a lower injection pipe; the supplementary air system comprises a compressed air pipe, a compressed air branch pipe, an on-off valve, and a flow restrictor.

[0009] The gas main pipe is arranged along the longitudinal direction of the coke oven in the coke oven basement; the combustion chamber gas main pipe system is connected to the gas main pipe; the gas main pipe is connected to the flue of each gas regenerator through the gas main pipe and the waste gas on-off device; the plug and the first flow restrictor are sequentially installed on the gas main pipe along the gas flow direction; each combustion chamber gas branch pipe system is connected to the gas main pipe; the gas main pipe is connected to each gas regenerator compartment through the gas branch pipe and the lower injection pipe; the on-off valve and the second flow restrictor are sequentially installed on the gas branch pipe along the gas flow direction; the adjusting plug is installed between the gas branch pipe after the second flow restrictor and each lower injection pipe; the lower injection pipe passes through the coke oven foundation from bottom to top and is connected to the regenerator compartment; each regenerator compartment of the regenerator is provided with a lower injection pipe; the compressed air pipe is arranged along the longitudinal direction of the coke oven in the coke oven basement; the compressed air pipe is connected to the flue of the corresponding air regenerator through the compressed air branch pipe; the on-off valve is installed on the compressed air branch pipe.

[0010] Further, the high-pressure gas feedforward regulation heating system of the large coke oven further comprises a control system, which is connected to the hydraulic exchange machine of the plug 3 of the gas main pipe, the hydraulic exchange machine of the waste gas on-off device 5, the pneumatic actuator of the on-off valve 7 of the gas branch pipe, the coal charging operation mechanism of the coal charging car, and the temperature measuring sensor of the straight-line temperature, the cross-wall temperature, and the fire falling temperature of the coke oven.

[0011] Further, the plugs of each gas main pipe are connected through a connecting rod mechanism, and the waste gas on-off devices of each gas main pipe are connected through a connecting rod mechanism, which is driven by a hydraulic exchange machine.

[0012] Further, the on-off valves of each gas branch pipe are provided with a pneumatic actuator.

[0013] Further, the lower injection pipe in each combustion chamber gas branch pipe system is a reserved hole passing through the coke oven foundation and the regenerator partition wall, which is inserted into the regenerator compartment above the flue grate brick and below the checker brick, so that the lower injection gas enters the regenerator compartment without passing through the grate brick.

[0014] Another object of the present application also discloses a blast furnace gas feedforward regulation method of a large coke oven, comprising the following steps: after the gas in the gas main is heated by the combustion chamber gas main system and the combustion chamber gas branch system respectively and then enters the regenerator, the gas is supplied to the combustion chamber to form a double-channel gas supply. That is, the combustion chamber gas supply amount is supplied to the combustion chamber by the combustion chamber gas main system and the combustion chamber gas branch system through the regenerator.

[0015] Further, the combustion chamber gas supply variation in a coking cycle is achieved by the gas branch system regulation, the gas branch system regulation is sensitive and has high control precision, and each gas branch system regulation has little interference with each other.

[0016] Further, 80-90% (preferably 85%) of the total combustion chamber gas is supplied to the gas regenerator compartment by the gas main system through the exhaust air shutter and the gas regenerator flue, and the combustion chamber gas main system supplies the gas at a constant flow rate; 10-20% (preferably 15%) of the total combustion chamber gas is supplied to the gas regenerator compartment by the combustion chamber gas branch system through the lower injection pipe penetrating the coke oven foundation and the regenerator partition wall, and the gas branch is adjusted according to the feedforward system carbonization chamber coal charging sequence and the combustion chamber transverse wall temperature fluctuation prediction model, and the system has high regulation sensitivity; the supplementary air system synchronously injects air into the air regenerator through the lower injection pipe.

[0017] Further, the control system drives the connecting rod to move through the hydraulic exchanger at a set exchange time, so that the plugs of each gas main and the exhaust air shutter are synchronously opened and closed to realize the gas and flue gas regenerative switching. The control system independently opens and closes the opening and closing valves of the gas branch through the actuator to realize the gas supply and stop operation; the opening valve gas supply time of the corresponding combustion chamber gas branch opening and closing valve is adjusted according to the feedforward system carbonization chamber coal charging sequence and the combustion chamber transverse wall temperature fluctuation prediction model, and then the combustion chamber branch gas supply amount is adjusted. The total combustion chamber gas supply amount is matched with the heat required for coking of the carbonization chamber coal charge, and the combustion chamber transverse wall temperature fluctuation is reduced.

[0018] Further, the adjusting plug installed between the gas branch and each lower injection pipe can be used to adjust the gas flow of each vertical flue of the combustion chamber to ensure the consistency of the combustion chamber transverse wall temperature curve.

[0019] Further, in a gas switching cycle, the combustion chamber gas main system supplies a constant amount of gas, the combustion chamber gas main system sets a constant gas flow rate in the form of a flow limiting orifice plate, the gas branch opening and closing valve opening time in a switching cycle is changed to adjust the gas branch gas amount in a switching cycle, and then the total combustion chamber gas supply amount in a gas switching cycle is adjusted, the total gas supply amount = main pipe gas amount + branch pipe gas amount.

[0020] This invention relates to a blast furnace gas feedforward regulation heating system and regulation method for large coke ovens, which can effectively reduce coking energy consumption and improve coking production efficiency, meeting the requirements of high efficiency, energy saving, and environmental protection in coking production. Compared with existing technologies, it has the following advantages:

[0021] 1) Coke oven thermal regulation methods are flexible, simple, and highly sensitive.

[0022] 2) The gas supply is dynamically adjusted based on the temperature fluctuation of the combustion chamber transverse wall. When the initial heat requirement in the carbonization chamber is high, the gas supply from the branch gas pipe system is increased under a stable gas main supply condition, thereby increasing the coking speed of the coal and improving coke quality and production efficiency. When the heat requirement decreases at the end of the coking process in the carbonization chamber, the gas supply from the branch gas pipe system is stopped, which reduces gas consumption and saves energy.

[0023] 3) The regulation method of the dual-channel, high-precision feedforward regulation heating system for coke oven and blast furnace gas can be applied to the production of existing large coke ovens, which has good social and economic benefits. Attached Figure Description

[0024] Fig. 1 A schematic diagram of the blast furnace gas feedforward regulation and heating system for a large coke oven.

[0025] Fig. 2 A schematic diagram of the installation plan of the lower nozzle of the feedforward regulating heating system for blast furnace gas in a large coke oven.

[0026] Fig. 3 A schematic diagram of the installation section of the lower nozzle of the blast furnace gas feedforward regulation and heating system for a large coke oven.

[0027] Among them, 1. Gas main pipe, 2. Gas main pipe, 3. Cock valve, 4. First flow limiting orifice plate, 5. Waste gas switch, 6. Gas branch pipe, 7. On / off valve, 8. Second flow limiting orifice plate, 9. Adjusting cock valve, 10. Lower spray pipe, 11. Gas regenerator flue, 12. Checker brick, 13. Grate brick, 14. Air regenerator flue, 15. Regenerator main wall, 16. Regenerator partition wall, 17. Coke oven foundation. Detailed Implementation

[0028] The present invention will be further described below with reference to the embodiments:

[0029] Example 1

[0030] This embodiment discloses a large-scale coke oven gas dual-channel, high-precision, feedforward-controlled heating system, such as... Figs. 1-3 As shown, it includes a main gas pipe 1, a combustion chamber gas main pipe system, a combustion chamber gas branch pipe system, and a make-up air system;

[0031] The main gas pipe system of the combustion chamber comprises a main gas pipe 2, a plug 3, a first flow restrictor 4 and a waste gas on-off device 5, the branch gas pipe system of the combustion chamber comprises a branch gas pipe 6, an on-off valve 7, a second flow restrictor 8, an adjusting plug 9 and a lower injection pipe 10; the supplementary air system comprises a compressed air pipe, a compressed air branch pipe, an on-off valve and a flow restrictor.

[0032] The main gas pipe 1 is arranged along the longitudinal direction of the coke oven in the underground room of the coke oven.

[0033] The main gas pipe system of the combustion chamber is connected to the main gas pipe, the main gas pipe 1 is connected to each flue 11 of the gas regenerator through the main gas pipe 2 and the waste gas on-off device 5, the plug 3 and the first flow restrictor 4 are sequentially installed on the main gas pipe 2 along the direction of gas flow; the plugs 3 of each main gas pipe 2 are connected through a connecting rod mechanism, the waste gas on-off devices 5 of each main gas pipe 2 are connected through a connecting rod mechanism, and the connecting rod mechanism is driven by a hydraulic exchanger.

[0034] Each branch gas pipe system of the combustion chamber is connected to the main gas pipe 1, the main gas pipe 1 is connected to each regenerator compartment through the branch gas pipe 6 and the lower injection pipe 10; the on-off valve 7 and the second flow restrictor 8 are sequentially installed on the branch gas pipe 6 along the direction of gas flow, the adjusting plug 9 is installed between the branch gas pipe 6 after the second flow restrictor 8 and each lower injection pipe 10, the lower injection pipe 10 passes through the coke oven foundation 17 from bottom to top to communicate with the regenerator compartment, and each regenerator compartment of the regenerator is provided with one lower injection pipe 10; specifically, the lower injection pipe 10 in each branch gas pipe system of the combustion chamber is inserted into the regenerator compartment above the flue grate brick 13 and below the checker brick 12 through the reserved hole of the coke oven foundation 17 and the regenerator partition wall 16, so that the lower injection gas does not pass through the grate brick to enter the regenerator compartment. The regenerator main wall 15 is a partition wall between the gas upflow regenerator and the gas downflow regenerator, and the regenerator main wall and the regenerator partition wall are different in structure. The on-off valve 7 of each branch gas pipe 6 is matched with a pneumatic actuator.

[0035] The compressed air pipe is arranged along the longitudinal direction of the coke oven in the underground room of the coke oven, the compressed air pipe is connected to the corresponding air regenerator flue 14 through the compressed air branch pipe, and the on-off valve is installed on the compressed air branch pipe.

[0036] The blast furnace gas feedforward regulation heating system of the large coke oven further comprises a control system, the hydraulic exchanger of the plug 3 of the main gas pipe, the hydraulic exchanger of the waste gas on-off device 5, the pneumatic actuator of the on-off valve 7 of the branch gas pipe, the coal charging operation mechanism of the coal charging car, the temperature measuring sensor of the straight running temperature of the coke oven, the temperature measuring sensor of the cross wall temperature, and the temperature measuring sensor of the fire falling temperature are electrically connected.

[0037] Example 2

[0038] The embodiment discloses a blast furnace gas feedforward regulation method of a large coke oven.

[0039] The blast furnace gas feedforward regulation method of the large coke oven comprises the following steps: after gas in a gas main pipe is heated by a combustion chamber gas main pipe system and a combustion chamber gas branch pipe system and then enters an accumulator chamber, the gas is supplied to a combustion chamber to form double-channel gas supply. That is, the combustion chamber gas supply amount is supplied to the combustion chamber by the combustion chamber gas main pipe system and the combustion chamber gas branch pipe system through the accumulator chamber. The combustion chamber gas supply variation in one coking cycle is realized by adjusting the combustion chamber gas branch pipe system, the combustion chamber gas branch pipe system is sensitive to adjustment and has high control precision, and the combustion chamber gas branch pipe system has little interference with each other during adjustment.

[0040] Specifically, 85% of the total combustion chamber combustion gas is supplied to the gas accumulator chamber by the gas main pipe system through the waste gas on-off device 5, the gas flue 11 of the gas accumulator chamber and the gas accumulator chamber compartment area, and the combustion chamber gas in the gas main pipe system is supplied at a constant flow rate; 15% of the total combustion chamber combustion gas is supplied to the gas accumulator chamber compartment area by the combustion chamber gas branch pipe system through the lower injection pipe 10, the coke oven foundation 17 and the accumulator chamber partition wall 16, the combustion chamber gas branch pipe 6 is adjusted according to the coking chamber coal charging sequence and the combustion chamber transverse wall temperature fluctuation prediction model, the system has high adjustment sensitivity; the supplementary air system works synchronously with the combustion chamber gas branch pipe 6, and the supplementary air system injects air into the air accumulator chamber.

[0041] The control system drives the connecting rod to move in a timing manner through the hydraulic exchanger according to the set exchange time, so that the plugs 3 of the gas main pipes 2 are synchronously opened and closed, and the gas and flue gas are exchanged. The control system independently opens and closes the opening and closing valves 7 of the gas branch pipes 6 through the actuator, so that the gas is supplied and stopped. According to the coking chamber coal charging sequence and the combustion chamber transverse wall temperature fluctuation prediction model, the opening valve gas supply time of the corresponding combustion chamber gas branch pipe opening and closing valve 7 is adjusted, and then the combustion chamber branch pipe gas supply amount is adjusted. The total combustion chamber gas supply amount is matched with the heat required for coking of the coking chamber coal charge, and the combustion chamber transverse wall temperature fluctuation is reduced.

[0042] The adjusting plug 9 installed between the gas branch pipe 6 and each lower injection pipe 10 can be used to adjust the gas flow of each vertical flue of the combustion chamber, so as to ensure the consistency of the combustion chamber transverse wall temperature curve.

[0043] In one gas exchange cycle, the combustion chamber gas main pipe system supplies a constant amount of gas, the combustion chamber gas main pipe system sets a constant gas flow rate in a manner of a flow limiting orifice plate 4, the opening valve length of the gas branch pipe opening and closing valve 7 in one exchange cycle is changed to adjust the gas branch pipe gas amount in one exchange cycle, and then the total combustion chamber gas supply amount (main pipe gas amount + branch pipe gas amount) in one gas exchange cycle is adjusted.

[0044] When coke oven n number of carbonization chamber is loaded, the heat storage room exchange time is determined 20min / time, the average flow 85% of the gas through the heat storage room gas main pipe into n number of heat storage room gas flue 11, the gas through the grate brick into the heat storage-heat exchange area, the corresponding flow of air also enters the combustion chamber; part of the gas from the gas main pipe through the heat storage room gas branch pipe by the lower injection pipe into the gas heat storage room grid area, mixed with the gas through the gas heat storage room flue 11, grate brick 13. After heat storage-heat exchange, the gas enters n and n+1 combustion chamber respectively. The flow limiting orifice plate of the heat storage room gas branch pipe is set to 30% of the average flow of the gas flow chamber. From the beginning of the carbonization chamber loading to the end of the coking time, the time of the gas branch pipe opening and closing valve and the gas supply amount are shown in table 1.

[0045] The specific parameters of the large-scale coke oven blast furnace gas double-channel, high-precision, feedforward regulation heating system and regulation method of the embodiment are as follows:

[0046]

[0047] (One gas heat storage room needs to supply gas to two combustion chambers)

[0048]

[0049] In one coking cycle, the amount of gas supplied by the gas heat storage room to the combustion chamber is the sum of the gas supply of the combustion chamber gas main pipe system and the combustion chamber branch pipe system. The combustion chamber gas supply amount in each time period in one coking cycle is shown in the following table:

[0050] Table 1

[0051] T1 0～2 2～4 4～6 6～8 8～10 10～12 12～14 14～16 16～18 18～20 V1 5640 5640 5640 5640 5640 5640 5640 5640 5640 5640 T2 20×6 15×6 10×6 20×6 15×6 10×6 V2 1920 1440 960 1920 1440 960 Vtotal 7560 7080 6600 5640 5640 7560 7080 6600 5640 5640

[0052] V1 combustion chamber gas main pipe system 2 hours of gas supply

[0053] V2 combustion chamber branch pipe system gas 2 hours of gas supply at different times

[0054] Vtotal gas heat storage room 2 hours of gas supply

[0055] T1 different time periods between coke loading in carbonization chamber and coke pushing

[0056] T2 total time of combustion chamber branch pipe system gas opening and closing valve opening in 2 hours of time period

[0057] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application; although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions recorded in the above embodiments can be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A feedforward regulating and heating system for blast furnace gas in a large coke oven, characterized in that, This includes the main gas pipe (1), the combustion chamber gas main pipe system, the combustion chamber gas branch pipe system, and the make-up air system; The combustion chamber gas main system includes a gas main (2), a stopcock (3), a first flow restrictor (4), and an exhaust gas switch (5); the combustion chamber gas branch system includes a gas branch pipe (6), an on / off valve (7), a second flow restrictor (8), an adjusting stopcock (9), and a lower spray pipe (10); the supplementary air system includes a compressed air pipe, a compressed air branch pipe, an on / off valve, and a flow restrictor. The main gas pipe (1) is arranged longitudinally along the coke oven in the coke oven basement; the combustion chamber gas main pipe system is connected to the main gas pipe (1), and the main gas pipe (1) is connected to each gas regenerator flue (11) through the main gas pipe (2) and the exhaust gas switch (5). The main gas pipe (2) is sequentially equipped with a stopcock (3) and a first flow limiting orifice plate (4) along the gas flow direction; the combustion chamber gas branch pipe system is connected to the main gas pipe (1), and the main gas pipe (1) is connected to each gas regenerator compartment through the gas branch pipe (6) and the lower spray pipe (10); the gas branch pipe (6) An on / off valve (7) and a second flow-limiting orifice plate (8) are installed sequentially along the gas flow direction. An adjusting plug (9) is installed between the gas branch pipe (6) after the second flow-limiting orifice plate (8) and each lower spray pipe (10). The lower spray pipe (10) passes through the coke oven foundation (17) from bottom to top and connects to the heat storage chamber compartment. Each heat storage chamber compartment is provided with a lower spray pipe (10). The compressed air pipe is arranged longitudinally along the coke oven in the coke oven basement. The compressed air pipe is connected to the corresponding air heat storage chamber flue (14) through each compressed air branch pipe. An on / off valve is installed on the compressed air branch pipe. Each of the gas branch pipes (6) is equipped with an on / off valve (7) and a pneumatic actuator. The valves (3) of each gas main pipe (2) are connected by a linkage mechanism, and the exhaust gas openers (5) of each gas main pipe (2) are connected by a linkage mechanism, which is driven by a hydraulic switch.

2. The blast furnace gas feedforward regulating and heating system for a large coke oven according to claim 1, characterized in that, It also includes a control system, which is connected to the hydraulic switch of the valve (3) of the main gas pipe and the hydraulic switch of the exhaust gas switch (5), respectively, to the pneumatic actuator of the opening and closing valve (7) of the gas branch pipe, to the coal loading operation mechanism of the coal loading car, and to the temperature sensors for measuring the straight temperature, transverse wall temperature and fire drop temperature of the coke oven.

3. The blast furnace gas feedforward regulating and heating system for a large coke oven according to claim 1, characterized in that, The lower spray pipe (10) in each of the combustion chamber gas branch pipe systems is inserted through the reserved holes of the coke oven foundation (17) and the regenerator partition wall (16) into the regenerator compartment above the flue grate brick (13) and below the grid brick (12), so that the lower spray gas does not enter the regenerator compartment through the grate brick.

4. A method for feedforward regulation of blast furnace gas in a large coke oven, characterized in that, The blast furnace gas feedforward regulation and heating system of any one of claims 1-3 for large coke ovens includes the following steps: the gas in the main gas pipe enters the regenerator for heating through the combustion chamber gas main pipe system and the combustion chamber gas branch pipe system respectively, and then supplies gas to the combustion chamber to form a dual-channel gas supply.

5. The blast furnace gas feedforward regulation method for large coke ovens according to claim 4, characterized in that, During a coking cycle, the amount of gas supplied to the combustion chamber is adjusted through the gas branch pipe system.

6. The blast furnace gas feedforward regulation method for large coke ovens according to claim 4, characterized in that, 80-90% of the total combustion gas in the combustion chamber is supplied by the main gas system through the exhaust gas switch and the gas regenerator flue into the gas regenerator compartment. The main gas system supplies gas at a constant flow rate. 10-20% of the total combustion gas in the combustion chamber is supplied by the branch gas system through the lower spray pipe, passing through the coke oven foundation and the regenerator partition wall into the gas regenerator compartment. The amount of gas supplied by the branch gas system is adjusted according to the coal loading sequence in the carbonization chamber and the temperature fluctuation prediction model of the transverse wall of the combustion chamber in the feedforward system. The supplementary air system injects air into the air regenerator synchronously with the gas supplied by the branch gas system.

7. The blast furnace gas feedforward regulation method for large coke ovens according to claim 4, characterized in that, The control system drives the linkage to move in a timed manner through the hydraulic exchanger according to the set exchange time, so that the cocks and exhaust gas openers of each gas main pipe open and close synchronously, realizing the heat storage and direction switching of coal gas and flue gas; the control system independently opens and closes the valves of the gas branch pipes through the actuator, realizing the supply and stop of coal gas; and adjusts the opening time of the valves of the corresponding combustion chamber gas branch pipes according to the coal loading sequence of the carbonization chamber and the temperature fluctuation prediction model of the combustion chamber transverse wall in the feedforward system.

8. The blast furnace gas feedforward regulation method for large coke ovens according to claim 4, characterized in that, During a gas reversal cycle, the combustion chamber gas main system supplies a constant amount of gas. The combustion chamber gas main system uses a flow-limiting orifice plate to set a constant gas flow rate. By changing the opening duration of the gas branch pipe valves during a reversal cycle, the amount of gas passing through the gas branch pipes during a reversal cycle is adjusted, thereby regulating the total amount of gas supplied to the combustion chamber during a gas reversal cycle.

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