Coke oven gas single heat type coke oven body structure and coke oven heating gas regulation method

Abstract

The present invention provides a coke oven body structure using single-heat coke oven gas and a method for regulating coke oven heating gas. The coke oven body and heating gas system comprise a plurality of independent combustion chamber gas heating units, each of which comprises a combustion chamber, an air preheating chamber, a flue gas cooling chamber, an air reversing valve, a flue gas reversing valve, and a gas supply system. Each combustion chamber of the coke oven body structure using single-heat coke oven gas of the present invention is integrated into an independent combustion chamber heating system using the components "air reversing valve - air preheating chamber - combustion chamber - flue gas cooling chamber - flue gas reversing valve" and a coke oven gas branch pipe. The vertical fire channel of the combustion chamber utilizes a single-stage air supply and a multi-stage coke oven gas supply. The coke oven heating gas regulation method of the present invention can reduce coking heat consumption, improve coking production efficiency, and meet the requirements of high-efficiency, energy-saving, and environmentally friendly coking production.

Description

Technical Field

[0001] The present invention relates to a coking production technology, in particular to a coke oven gas single-heat type coke oven body structure and a coke oven heating gas regulating method. Background Art

[0002] Large coke ovens use either coke oven gas (COG) or blast furnace gas (BFG) as heating fuels. The reheating coke oven structure can accommodate both BFG and COG. Currently, all existing coke ovens utilize the reheating coke oven structure. When COG is the only heating fuel, the coke oven structure design still mirrors the reheating coke oven structure; only the equipment and piping associated with the BFG heating system are eliminated.

[0003] The coke oven body is divided into a carbonization chamber, a combustion chamber, a regenerator, a chute area, and a furnace roof area. A coke oven has 60 to 70 carbonization chambers, which are arranged alternately with the combustion chambers. The number of combustion chambers is one more (side combustion chamber) than the carbonization chambers. Coal gas burns in the combustion chambers, transferring heat to the carbonization chambers through the furnace walls. The combustion chamber is divided into several fire channels along its length by partition walls, with a center-to-center distance of approximately 480 to 520 mm. An ascending fire channel and a descending fire channel form a group. The regenerator is located below the coke oven body and is connected to the combustion chamber via a chute above. Its bottom is connected to the flue gas branch, blast furnace gas pipe, or atmosphere via an exhaust gas switch. Each combustion chamber is equipped with a gas regenerator and an air regenerator. The regenerator roof is connected to the combustion chamber vertical fire channel via a chute. The top of the ascending regenerator connects the two combustion chambers, while the top of the descending regenerator connects the two combustion chambers. That is, the rising airflow "N" heat storage chamber is connected to the rising fire channel of the "N-1, N" combustion chamber respectively, and the descending airflow "N+1" heat storage chamber is connected to the descending fire channel of "N, N+1" respectively. This cross-connection between the heat storage chamber and the combustion chamber constitutes a "multi-chamber furnace heating system" for the coke oven; the system has the following typical characteristics: 1. The reversing cycle of each heat storage chamber of the coke oven is the same, and the reversing action of the heat storage chamber exhaust gas switch is synchronized; 2. The gas and air flow rates passing through each heat storage chamber are equal, and the gas and air flow rates do not change with time; 3. When the heat storage chamber exhaust gas switch is reversed, the coke oven stops supplying gas for a short time, and the suction of the combustion system fluctuates. When using coke oven gas for heating, the lower nozzle on the coke oven gas branch pipe sends the coke oven gas to the vertical fire channel of the combustion chamber through the heat storage chamber partition wall and the brick gas channel in the inclined area; the gas heat storage chamber and the air heat storage chamber are both used as air heat storage chambers.

[0004] Reheating coke ovens utilize both blast furnace gas (BFG) and coke oven gas (COG) heating methods. When heating with BFG, BFG and air are preheated in the gas and air regenerators, respectively, before entering the combustion chamber through a chute. To ensure uniform heating across the coke oven, gas and air are supplied to the combustion chamber in multiple stages. When heating with COG, COG enters the combustion chamber through a brick gas duct at the bottom of the combustion chamber. Both the gas and air regenerators function as air regenerators. After being preheated in the regenerators, air is supplied to the combustion chamber through a chute in multiple stages. Coke oven gas contains 60% H2 and 25% CH4, with a calorific value of 17,000 kJ / m³. BFG contains 25-30% CO, with a calorific value of 4,000 kJ / m³. Due to the rapid combustion and high calorific value of the combustible components in coke oven gas, reheating coke ovens heated with coke oven gas can suffer from large temperature differences between the vertical flue, poor vertical heating uniformity, low thermal efficiency, and high NOx concentrations in the flue gas. The coking industry urgently needs to develop a single-heat coke oven structure and gas regulation method that adapts to the characteristics of coke oven gas heating. This new coke oven structure can meet the requirements of improving vertical heating uniformity in the carbonization chamber, reducing NOx levels in the flue gas, and improving thermal efficiency. Summary of the Invention

[0005] The purpose of the present invention is to address the problems of poor high-directional heating uniformity, low thermal efficiency and high NOx content when a reheating coke oven is heated by coke oven gas, and to propose a coke oven body structure with single-heat coke oven gas. The single-heat coke oven body structure has coke oven gas combustion characteristics and a simple body structure; the heating gas regulation method is flexible in operation and has high regulation accuracy, and can meet the requirements of high efficiency, energy saving and environmental protection in coking production.

[0006] To achieve the above object, the technical solution adopted by the present invention is: a coke oven body structure of a single-heat type coke oven using coke oven gas, comprising a plurality of independent combustion chamber gas heating units, wherein the combustion chamber gas heating units include: a combustion chamber, an air preheating system, a flue gas cooling system and a gas supply system;

[0007] The combustion chamber, air preheating system, flue gas cooling system and gas supply system are integrated into an independent combustion chamber gas heating unit. Each combustion chamber gas heating unit is independent of each other. Gas and air are burned in the vertical flue space of the combustion chamber and heat is supplied to the coal charge in the carbonization chamber through the furnace wall. The combustion chamber gas heating unit and the carbonization chamber are arranged alternately to form a coking unit.

[0008] The combustion chamber comprises: an ascending vertical fire channel, a descending vertical fire channel, a gas bottom outlet, a gas middle outlet, an upper gas outlet, a vertical fire channel partition wall, an inclined channel, and a brick gas channel. The combustion chamber is divided into a plurality of vertical fire channels by the vertical fire channel partition wall, with two adjacent vertical fire channels forming a group. An air inlet or a smoke outlet is provided at the bottom of each vertical fire channel. A brick gas channel is provided in the vertical fire channel partition wall. The side walls of the vertical fire channel partition wall are provided with a gas bottom outlet, a gas middle outlet, and an upper gas outlet communicating with the brick gas channel from bottom to top. The brick gas channel extends downward and is connected to a first gas branch pipe or a second gas branch pipe.

[0009] The gas supply system includes: a coke oven gas main pipe, a first gas branch pipe, a first gas on-off valve, a second gas branch pipe, and a second gas on-off valve. The coke oven gas main pipe is connected to the brick gas passages in the partition walls of odd-numbered vertical flues via the first gas branch pipe, and the coke oven gas main pipe is connected to the brick gas passages in the partition walls of even-numbered vertical flues via the second gas branch pipe. The first gas on-off valve is provided on the first gas branch pipe, and the second gas on-off valve is provided on the second gas branch pipe. The first gas on-off valve and the second gas on-off valve are each equipped with an independent reversing actuator.

[0010] The air preheating system includes: an air preheating chamber, an air reversing valve, an air inlet and a smoke duct, wherein the air reversing valve is provided with an independent reversing actuator;

[0011] The flue gas cooling system includes: a flue gas cooling chamber, a flue gas reversing valve, an air inlet and a flue gas branch, wherein the flue gas reversing valve is provided with an independent reversing actuator;

[0012] The independent reversing actuators of the first gas on-off valve and the second gas on-off valve, and the independent reversing actuators of the air reversing valve and the flue gas reversing valve perform airflow reversing operations according to operating instructions of the control system;

[0013] The air preheating chamber, flue gas cooling chamber, first gas branch pipe, and second gas branch pipe are arranged below the combustion chamber; each set of vertical flues is connected to the corresponding air preheating chamber top and flue gas cooling chamber top via two inclined channels, the air preheating chamber bottom is connected to the flue gas branch and air inlet via an air reversing valve; the flue gas cooling chamber bottom is connected to the flue gas branch and air inlet via a flue gas reversing valve; the first gas branch pipe and the second gas branch pipe pass through the coke oven foundation roof via a gas downspout, delivering gas to the rising vertical flue of the combustion chamber via a brick gas duct;

[0014] The air preheating chamber and the flue gas cooling chamber are filled with checker brick heat storage bodies; the top of the air preheating chamber is connected to the bottom of the odd-numbered vertical fire channels of the corresponding combustion chamber through a ramp; the top of the flue gas cooling chamber is connected to the bottom of the even-numbered vertical fire channels of the corresponding combustion chamber through a ramp; the air reversing valve and the flue gas reversing valve are operated synchronously to make the rising air flow and the descending flue gas flow alternate, and the checker bricks undergo a heat storage-heat release process.

[0015] Furthermore, the coke oven gas single-heat coke oven body structure also includes a control system, which is connected to the status signal communication of the first gas on-off valve, the second gas on-off valve, the air reversing valve, and the flue gas reversing valve. The control system can control the airflow reversing operation of each combustion chamber in a distributed manner, so that the airflow reversing moments of each combustion chamber are asynchronous with each other; the independent actuators of the first gas on-off valve, the second gas on-off valve, the air reversing valve, and the flue gas reversing valve in each combustion chamber perform synchronous airflow reversing operations according to the instructions of the control system. The coal distillation process in the carbonization chamber is a non-steady-state heat transfer process. The control system of the present invention can control the gas flow changes of the combustion chamber gas heating unit, optimize the furnace wall heat transfer process, and improve the thermal efficiency of the heat transfer process.

[0016] Furthermore, the brick gas duct enters the vertical fireway partition wall from the bottom of the vertical fireway partition wall upwards, and extends along the vertical fireway partition wall to a height of 2.5 to 3.5 meters from the bottom of the vertical fireway.

[0017] Furthermore, in the present invention, the coke oven gas enters the vertical flue in three sections; a gas bottom outlet is provided in the brick gas duct 0.5 to 1.0 m above the bottom of the vertical flue, a gas upper outlet is provided at the highest point of the brick gas duct, and a gas middle outlet is provided between the gas bottom outlet and the gas upper outlet.

[0018] Furthermore, the coke oven gas enters the vertical fire channel in three sections, and regulating bricks are provided at the brick gas channel outlets of the vertical fire channel (gas bottom outlet, gas middle outlet and gas upper outlet). When the coke oven is built, the cross-sectional area of ​​the brick gas channel outlet is changed by placing regulating bricks of different specifications.

[0019] Furthermore, the ramp on the top of the air preheating chamber is connected to the air outlet at the bottom of the vertical fire duct of the corresponding combustion chamber. The preheated air enters the rising vertical fire duct of the combustion chamber through the ramp and burns the gas supplied in sections by the brick gas duct. The rising flue gas enters the descending vertical fire duct of the adjacent combustion chamber through the crossing hole (the crossing hole is a connecting channel at the top of the two vertical fire ducts), and the flue gas is discharged from the flue gas outlet at the bottom of the vertical fire duct through the ramp to the flue gas cooling chamber corresponding to the combustion chamber.

[0020] Another object of the present invention is to disclose a method for regulating coke oven heating gas using a coke oven gas single-heat type coke oven body structure, comprising the following steps:

[0021] The control system controls the opening and closing of the first and second gas on-off valves in the combustion chamber according to a set switching cycle. The control system also controls the air reversing valve and the flue gas reversing valve to synchronize with the first and second gas on-off valves. The first and second gas branch pipes alternately supply gas to the combustion chambers, and the first and second gas on-off valves experience a brief gas supply interruption during these switching cycles. The control system adjusts the airflow reversal timing of each combustion chamber in the coke oven, so that while some combustion chambers experience a gas supply interruption during reversal, other combustion chambers continue to burn gas. During this time, the flue gas flow entering the branch flue flue flue flues slightly, but the internal suction of the coke oven combustion chamber remains stable. The coke oven gas system of a traditional coke oven utilizes synchronous reversal, which causes a brief gas supply interruption in each combustion chamber during reversal. This causes significant fluctuations in the internal suction of the coke oven combustion chamber due to chimney suction, leading to gas leakage from the carbonization chamber into the combustion chamber.

[0022] Furthermore, the combustion chamber heating gas regulation system feed-forwards the gas supply for each exchange cycle within a coking cycle based on the carbonization chamber's coke pushing and coal loading schedule and the heat consumption of the charged coal for coking. The control system regulates the pause time between the alternating directions of the first and second gas on-off valves within the exchange cycle, specifically the pause time between the transition from the first gas on-off valve open and the second gas on-off valve closed state to the first gas on-off valve closed and the second gas on-off valve open state. During this pause time, the gas system stops supplying gas to the combustion chamber, and the control system adjusts the pause time to regulate the gas flow. This heating gas regulation method reduces the gas supply by shortening the valve opening time of the first and second gas branch pipes.

[0023] Furthermore, each combustion chamber in the coke oven gas-only heat system integrates the components of the "air reversing valve - air preheating chamber - combustion chamber - flue gas cooling chamber - flue gas reversing valve" into an independent combustion chamber gas heating unit. The control system regulates the gas flow to each combustion chamber gas heating unit without interfering with each other. The coke oven heating control system adjusts the gas supply flow to meet the requirements of varying the heating intensity from the combustion chamber to the carbonization chamber based on actual production conditions.

[0024] Furthermore, in order to adapt to the characteristics of coke oven gas, which has a fast combustion speed and high calorific value, a multi-stage gas and single-stage air supply method is adopted to create a gas-deficient combustion environment in the vertical fire channel; the gas outlet flow of each section is controlled to reduce the temperature of the gas combustion zone, which is beneficial to the high-direction heating balance of the carbonization chamber.

[0025] Furthermore, the coke oven gas enters the vertical fire channel in three sections. The size of the regulating bricks at the gas outlet of each section is changed, the cross-sectional area of ​​each outlet is adjusted, and the gas distribution ratio of each outlet is controlled as follows: the gas distribution ratio of the lower section (gas bottom outlet) is 40-50%, the gas distribution ratio of the middle section (gas middle outlet) is 40-30%, and the gas distribution ratio of the upper section (gas upper outlet) is 10-20%.

[0026] The present invention provides a single-heat coke oven structure and heating gas regulation method, which can effectively reduce the high-level temperature difference in the carbonization chamber, reduce the temperature and area of ​​the vertical flue gas combustion zone, reduce coking gas consumption, lower the NOx concentration in the flue gas, and improve coking production efficiency, thus meeting the requirements of high-efficiency, energy-saving, and environmentally friendly coking production. Compared with existing technologies, it has the following advantages:

[0027] 1) The coke oven body of the present invention, which uses coke oven gas for single-heating, has a simple structure and adapts to the combustion characteristics of coke oven gas. The gas heating system is flexible to adjust, has high control accuracy, and is sensitive to temperature changes.

[0028] 2) The present invention's heating gas regulation method utilizes a single-stage air and multi-stage gas supply system, creating a lean combustion environment within the vertical flue. This overcomes the significant temperature difference across the carbonization chamber that occurs when reheating coke ovens use coke oven gas for heating. It also reduces the high temperatures in the gas combustion zone within the vertical flue, lowering coking gas consumption and reducing flue gas NOx concentrations.

[0029] 3) Each combustion chamber of the coke oven of this invention functions as an independent heating unit. The feedforward gas heating system dynamically controls the gas flow rate in the combustion chamber based on parameters such as the coking and coal charging schedule in the carbonization chamber and the coking heat consumption. This reduces coking heat consumption and improves coking production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the structure of a coke oven gas single-heat type coke oven body according to the present invention;

[0031] Figure 2 This is a schematic diagram of the furnace structure of the present invention;

[0032] Figure 3 for Figure 2 Schematic diagram of section 1-1

[0033] Figure 4 for Figure 2 Schematic diagram of section 2-2

[0034] Figure 5 for Figure 2 Schematic diagram of section 3-3

[0035] Among them, 1. rising vertical fire channel of combustion chamber, 2. descending vertical fire channel of combustion chamber, 3. air preheating chamber, 4. air reversing valve, 5. air inlet, 6. branch flue, 7. flue gas cooling chamber, 8. flue gas reversing valve, 9. coke oven gas main, 10. first gas branch pipe, 11. first gas on-off valve, 12. second gas branch pipe, 13. second gas on-off valve, 14. bottom gas outlet, 15. middle gas outlet, 16. upper gas outlet, 17. vertical fire channel partition wall, 18. inclined channel, 19. brick gas channel. DETAILED DESCRIPTION

[0036] The present invention is further described below with reference to the embodiments:

[0037] Example 1

[0038] This embodiment discloses a coke oven gas dual-channel, high-precision, feedforward regulation heating system, such as Figure 1-5 As shown, it includes several independent combustion chamber gas heating units, and the combustion chamber gas heating units include: a combustion chamber, an air supply system, a flue gas cooling system, and a gas system pipeline.

[0039] The combustion chamber includes an ascending vertical fire channel 1, a descending vertical fire channel 2, a gas bottom outlet 14, a gas middle outlet 15, a gas upper outlet 16, a vertical fire channel partition wall 17, a ramp 18, and a brick gas channel 19.

[0040] The gas system pipeline includes a coke oven gas main pipe 9, a first gas branch pipe 10, a first gas on-off valve 11, a second gas branch pipe 12, and a second gas on-off valve 13. The on-off valve is provided with an independent actuator.

[0041] The air supply system includes: an air preheating chamber 3, an air reversing valve 4, an air inlet 5, and a smoke duct 6. The air reversing valve is provided with an independent actuator.

[0042] The flue gas cooling system includes: an air inlet 5, a branch flue 6, a flue gas cooling chamber 7, and a flue gas reversing valve 8. The flue gas reversing valve is provided with an independent actuator.

[0043] The combustion chambers and carbonization chambers are arranged alternately, with an air preheating chamber 3 and a flue gas cooling chamber 7 correspondingly located below each combustion chamber. Each combustion chamber is also equipped with a first gas branch pipe 10, a first gas on-off valve 11, a second gas branch pipe 12, and a second gas on-off valve 13. Each combustion chamber is divided longitudinally by a vertical fire channel partition wall 17. The combustion chamber's vertical fire channel connects to the top of the corresponding air preheating chamber 3 or flue gas cooling chamber 7 via an inclined channel 18. The bottom of the air preheating chamber 3 connects to the branch flue 6 and air inlet 5 via an air reversing valve 4. The bottom of the flue gas cooling chamber 7 connects to the branch flue 6 and air inlet 5 via a flue gas reversing valve 8. The coke oven gas branch pipe passes through the coke oven foundation roof via a gas downspout, delivering gas via a brick gas channel 19 to the combustion chamber's rising vertical fire channel 1. Each combustion chamber acts as an independent combustion gas heating unit that supplies heat to the carbonization chamber walls on both sides.

[0044] The air preheating chamber 3 and flue gas cooling chamber 7 are filled with checker brick heat storage. The top of the air preheating chamber 3 is connected to the bottom of the odd-numbered vertical flues of the combustion chamber via a ramp 18, while the top of the flue gas cooling chamber 7 is connected to the bottom of the even-numbered vertical flues via a ramp 18. The air reversing valve 4 and the flue gas reversing valve 8 operate synchronously, alternating the rising air flow and the descending flue gas flow, causing the checker bricks to undergo a heat storage and heat release process.

[0045] The combustion chamber is divided into several vertical fire channels by a vertical fire channel partition wall 17. Two adjacent vertical fire channels form a group. The tops of the two vertical fire channels are provided with a crossing hole for connection. The bottom partition wall of one group of vertical fire channels is provided with a flue gas circulation hole. The bottom of the vertical fire channel is provided with an air inlet or a flue gas outlet. The vertical fire channel partition wall 17 is provided with a brick gas channel 19, a gas bottom outlet 14, a gas middle outlet 15 and a gas upper outlet 16.

[0046] The control system synchronously controls the gas switch, the air reversing valve, and the flue gas reversing valve actuator to perform combustion chamber airflow reversal.

[0047] The brick gas duct extends upward from the bottom of the partition wall, through the ramp area, into the vertical flue partition wall, and extends along the vertical flue partition wall to a height of 3.0 m from the vertical flue bottom. A gas outlet is provided in the brick gas duct 0.5 m above the vertical flue bottom and at the highest point of the brick gas duct. A second gas outlet is provided between the two outlets. Coke oven gas enters the vertical flue in three sections.

[0048] The coke oven gas enters the vertical flue in three sections. The outlet of the vertical flue brick gas channel is provided with regulating bricks. When the coke oven is built, the cross-sectional area of ​​the brick gas channel outlet is changed by placing regulating bricks of different specifications.

[0049] The inclined channel on the top of the air preheating chamber is connected to the air outlet at the bottom of the vertical fire channel. The preheated air enters the vertical fire channel and the brick gas channel through the inclined channel for combustion of gas supplied in sections. The rising flue gas enters the adjacent descending air flow vertical fire channel through the crossing hole. The flue gas is discharged from the flue gas outlet at the bottom of the vertical fire channel through the inclined channel to the flue gas cooling chamber.

[0050] Example 2

[0051] This embodiment discloses a method for regulating the heating gas of a coke oven with a single heat type of coke oven using coke oven gas, which can adopt the coke oven body structure of the single heat type of coke oven using coke oven gas described in Example 1.

[0052] Among them, there are the ascending vertical fire channel 1 of the combustion chamber, the descending vertical fire channel 2 of the combustion chamber, the air preheating chamber 3, the air reversing valve 4, the air inlet 5, the branch flue 6, the flue gas cooling chamber 7, the flue gas reversing valve 8, the coke oven gas main pipe 9, the first gas branch pipe 10, the first gas on-off valve 11, the second gas branch pipe 12, the second gas on-off valve 13, the gas bottom outlet 14, the gas middle outlet 15, the gas upper outlet 16, the vertical fire channel partition wall 17, the inclined channel 18, and the brick gas channel 19.

[0053] The method for regulating coke oven gas single-heat type coke oven heating gas comprises the following steps:

[0054] The first and second gas on-off valves 11 and 13 on the first and second gas branch pipes 10 and 12 of the combustion chambers open and close according to a set switching cycle, allowing the first and second gas branch pipes 10 and 12 to alternately supply gas to the combustion chambers. The gas on-off valve control system switches direction every 20 minutes. The air reversing valves 4 and flue gas reversing valves 8 in the air preheating chamber 3 and flue gas cooling chamber 7 switch direction synchronously with the switching cycle set by the on-off valve control system for the first and second gas branch pipes 10 and 12. The switching timing of the on-off valves of the first and second gas branch pipes 10 and 12 of the "N" combustion chamber and the reversing valves in the air preheating chamber and flue gas cooling chamber differs by 5 minutes from that of the "N+1" combustion chamber. That is, when the gas supply to the "N" combustion chamber stops, the "N+1" combustion chamber continues to supply gas. The combustion flue gas continuously enters the branch flue, reducing flue suction fluctuations. This also solves the problem of periodic suction fluctuations inside the coke oven body during reversal in traditional coke ovens. This is because the coke oven gas system needs to temporarily stop supplying gas when reversing. The chimney suction causes large fluctuations in the coke oven body's suction, which can lead to gas leakage from the carbonization chamber into the gas combustion system.

[0055] The combustion chamber heating gas regulation system feeds forward the gas supply for each exchange cycle within a coking cycle based on the coking chamber pushing and coal charging schedule and the coking heat consumption of the charged coal. It regulates the pause time between the alternating on / off valves of the first and second gas branches 10, 12 within the exchange cycle. This pause time is the time between the transition from the first gas on / off valve 11 open and the second gas on / off valve 13 closed to the first gas on / off valve 11 closed and the second gas on / off valve 13 open state. During this pause time, gas supply to the combustion chamber is stopped, thereby reducing the gas supply within a single exchange cycle. This heating gas regulation method achieves gas supply regulation by shortening the valve opening time of the first and second gas branches 10, 12. For example, if the switching cycle is set to 20 minutes, the first gas branch valve's opening time for gas supply can be set to four levels: 19.8' (maximum), 17.8', 16.8', and 14.8' (minimum). The first gas branch valve remains closed for the rest of the time. During the next switching cycle, the second gas branch valve's opening time for gas supply is similarly configured.

[0056] Each combustion chamber in a coke oven is integrated into an independent combustion chamber heating system, consisting of an air reversing valve, air preheating chamber, combustion chamber, flue gas cooling chamber, and flue gas reversing valve. Each combustion chamber independently regulates the heating gas flow without interfering with each other. The coke oven heating control system differentially controls the heat supply from each combustion chamber to the carbonization chamber based on actual production conditions. For example, during the initial coal loading phase of the carbonization chamber, the heat transfer from the furnace wall to the coal is high, so the aforementioned gas regulation method maintains maximum gas supply. The air and flue gas reversing valves synchronize with the gas on / off valves.

[0057] To accommodate the characteristics of coke oven gas combustion, gas is supplied in multiple stages, while air is supplied in a single stage, creating a gas-deficient combustion environment within the vertical flue. Controlling the gas outlet flow rate at each stage lowers the temperature of the gas combustion zone, facilitating balanced heating in all directions.

[0058] When the coke oven body is designed and built, the coke oven gas supplied by the combustion chamber enters the vertical fire channel in three sections. The size of the regulating bricks at the gas outlet of each section is changed, and the cross-sectional area of ​​each outlet is adjusted to control the distribution ratio of the outlet gas of each section as follows: 45% in the lower section, 40% in the middle section, and 15% in the upper section.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for regulating coke oven heating gas in a coke oven gas single heat type coke oven body structure, characterized in that: The following steps are involved: The coke oven gas single heat type coke oven body structure includes: a plurality of independent combustion chamber gas heating units, the combustion chamber gas heating units include: a combustion chamber, an air preheating system, a flue gas cooling system, a gas supply system and a control system; The combustion chamber comprises: an ascending vertical fire channel (1) of the combustion chamber, a descending vertical fire channel (2), a gas bottom outlet (14), a gas middle outlet (15), a gas upper outlet (16), a vertical fire channel partition wall (17), an inclined channel (18) and a brick gas channel (19); the combustion chamber is divided into a plurality of vertical fire channels by the vertical fire channel partition wall (17), two adjacent vertical fire channels forming a group, an air inlet or a smoke outlet is provided at the bottom of the vertical fire channel, a brick gas channel (19) is provided in the vertical fire channel partition wall (17), and a side wall of the vertical fire channel partition wall (17) is provided with a gas bottom outlet (14), a gas middle outlet (15) and a gas upper outlet (16) communicating with the brick gas channel (19) from bottom to top; the brick gas channel (19) extends downward and is connected to the first gas branch pipe (10) or the second gas branch pipe (12); The gas supply system comprises: a coke oven gas main pipe (9), a first gas branch pipe (10), a first gas on-off valve (11), a second gas branch pipe (12) and a second gas on-off valve (13); the coke oven gas main pipe (9) is connected to a brick gas channel (19) in an odd-numbered vertical fireway partition wall via the first gas branch pipe (10); the coke oven gas main pipe (9) is connected to a brick gas channel (19) in an even-numbered vertical fireway partition wall via the second gas branch pipe (12); the first gas on-off valve (11) is provided on the first gas branch pipe (10); the second gas on-off valve (13) is provided on the second gas branch pipe (12); the first gas on-off valve (11) and the second gas on-off valve (13) are respectively provided with independent reversing actuators; The air preheating system comprises: an air preheating chamber (3), an air reversing valve (4), an air inlet (5) and a smoke duct (6), wherein the air reversing valve (4) is provided with an independent reversing actuator; The flue gas cooling system comprises: a flue gas cooling chamber (7), a flue gas reversing valve (8), an air inlet (5) and a flue gas branch (6), wherein the flue gas reversing valve (8) is provided with an independent reversing actuator; The independent reversing actuators of the first gas on-off valve (11) and the second gas on-off valve (13), and the independent reversing actuators of the air reversing valve (4) and the flue gas reversing valve (8) perform airflow reversing operations according to operating instructions of the control system; The air preheating chamber (3), the flue gas cooling chamber (7), the first gas branch pipe (10), and the second gas branch pipe (12) are arranged below the combustion chamber; each group of vertical fire channels is connected to the corresponding top of the air preheating chamber (3) and the top of the flue gas cooling chamber (7) through two inclined channels (18), and the bottom of the air preheating chamber (3) is connected to the branch flue (6) and the air inlet (5) through the air reversing valve (4); the bottom of the flue gas cooling chamber (7) is connected to the branch flue (6) and the air inlet (5) through the flue gas reversing valve (8); the first gas branch pipe (10) and the second gas branch pipe (12) pass through the coke oven foundation top plate through the gas down nozzle, and send the gas to the rising vertical fire channel (1) of the combustion chamber through the brick gas channel (19); The air preheating chamber (3) and the flue gas cooling chamber (7) are filled with checker brick heat storage bodies; the top of the air preheating chamber (3) is connected to the bottom of the odd-numbered vertical fire channel of the corresponding combustion chamber through a ramp (18); the top of the flue gas cooling chamber (7) is connected to the bottom of the even-numbered vertical fire channel of the corresponding combustion chamber through a ramp (18); the air reversing valve (4) and the flue gas reversing valve (8) can be synchronously reversingly operated, so that the rising air flow and the descending flue gas flow are alternately reversed, and the checker bricks undergo a heat storage-heat release process; The control system is respectively connected to the state signal communication of the first gas on-off valve (11), the second gas on-off valve (13), the air reversing valve (4) and the flue gas reversing valve (8). The control system can control the airflow reversing operation of each combustion chamber in a distributed manner, so that the airflow reversing moments of each combustion chamber are asynchronous with each other; the independent actuators of the first gas on-off valve (11), the second gas on-off valve (13), the air reversing valve (4) and the flue gas reversing valve (8) of each combustion chamber perform the airflow reversing synchronous operation according to the control system instruction; The control system controls the opening and closing of the first gas on-off valve (11) and the second gas on-off valve (13) of the combustion chamber according to the set exchange cycle, and controls the air reversing valve (4) and the flue gas reversing valve (8) to synchronously switch according to the exchange cycle set by the first gas on-off valve (11) and the second gas on-off valve (13); the first gas branch pipe (10) and the second gas branch pipe (12) alternately supply gas to the combustion chamber, and the first gas on-off valve (11) and the second gas on-off valve (13) have a short gas supply stop time when they are alternately switching; the control system adjusts the airflow reversal time of each combustion chamber of the coke oven, that is, when some combustion chambers are in the process of switching and stopping gas supply, the other combustion chambers still maintain gas combustion; at this time, the flue gas flow entering the branch flue will fluctuate slightly, but the suction force inside the coke oven combustion chamber is stable.

2. The coke oven heating gas regulating method of the coke oven gas single heat type coke oven body structure according to claim 1, characterized in that: The brick gas channel (19) enters the vertical fire channel partition wall (17) from the bottom of the vertical fire channel partition wall (17) upwards and extends along the vertical fire channel partition wall (17) to a height of 2.5 to 3.5 meters from the bottom of the vertical fire channel.

3. The coke oven heating gas regulating method of the coke oven gas single heat type coke oven body structure according to claim 1, characterized in that: A gas bottom outlet (14) is provided on the brick gas duct (19) 0.5 to 1.0 m above the bottom of the vertical fire channel, a gas upper outlet (16) is provided at the highest point of the brick gas duct (19), and a gas middle outlet (15) is provided between the gas bottom outlet (14) and the gas upper outlet (16).

4. The coke oven heating gas regulating method of the coke oven gas single heat type coke oven body structure according to claim 1 or 3, characterized in that: Adjustment bricks are provided at the gas bottom outlet (14), the gas middle outlet (15), and the gas upper outlet (16) of the brick gas channel (19) of the vertical fire channel. When the coke oven is built, the outlet cross-sectional area of ​​the brick gas channel (19) is changed by placing adjustment bricks of different specifications.

5. The coke oven heating gas regulating method of the coke oven gas single heat type coke oven body structure according to claim 1, characterized in that: The ramp (18) on the top of the air preheating chamber (3) is connected to the air inlet at the bottom of the vertical flue of the corresponding combustion chamber. The preheated air enters the combustion chamber through the ramp (18) and the gas supplied in sections by the ascending vertical flue (1) and the brick gas channel (19) for combustion. The ascending flue gas enters the descending vertical flue (2) of the adjacent combustion chamber through the crossing hole. The flue gas is discharged from the flue gas outlet at the bottom of the vertical flue through the ramp (18) to the flue gas cooling chamber (7) corresponding to the combustion chamber.

6. The coke oven heating gas regulating method of the coke oven gas single heat type coke oven body structure according to claim 1 is characterized in that: The control system adjusts the pause time when the first gas on-off valve (11) and the second gas on-off valve (13) are switched in the switching cycle, that is, the pause time between the state of the first gas on-off valve (11) being open and the state of the second gas on-off valve (13) being closed and the state of the first gas on-off valve (11) being closed and the state of the second gas on-off valve (13) being open. During the pause time, the gas system stops supplying gas to the combustion chamber. The control system changes the length of the pause time to achieve the purpose of regulating the gas flow.

7. The coke oven heating gas regulating method of the coke oven gas single heat type coke oven body structure according to claim 1 is characterized in that: The gas supply method of multiple stages of gas and single stage of air is adopted to make the vertical fire channel in a combustion environment with deficient gas; the gas outlet flow of each stage is controlled to reduce the temperature of the gas combustion zone, which is beneficial to the high-direction heating balance of the carbonization chamber.

8. The method for regulating coke oven heating gas of a coke oven gas single heat type coke oven body structure according to claim 1 is characterized in that: The coke oven gas enters the vertical fire channel in three sections. By changing the size of the regulating bricks at the gas outlet of each section and adjusting the cross-sectional area of ​​each outlet, the gas distribution ratio of each outlet is controlled as follows: the gas distribution ratio of the lower section is 40-50%, the gas distribution ratio of the middle section is 40-30%, and the gas distribution ratio of the upper section is 10-20%.

Images