A coke oven heating gas switching method

Abstract

The present invention provides a coke oven heating gas switching method, which belongs to the technical field of safe switching of coke oven heating gas, and solves the problems of large gas leakage in the switching process of coke oven heating gas, high safety risk and high labor intensity in the operation process. The coke oven gas branch pipe of the present invention enters the coke oven combustion chamber through the adjustment cock control; the blast furnace gas branch pipe is controlled by the blast furnace gas branch pipe cock, and enters the coke oven combustion chamber through the waste gas disk; the switch controls the opening and closing of the coke oven gas exchange cock and the waste gas disk cover by pulling the switch gas pull rod and the switch waste gas pull rod to reciprocate, thereby controlling the entry of coke oven heating gas and the discharge of waste gas. The present invention effectively reduces the safety risk of switching operation, reduces labor intensity and safety risk, and improves operation efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of safe switching of coke oven heating gas, and in particular relates to a method for switching of coke oven heating gas. Background Art

[0002] In the coking production process, most coke ovens in coking plants of steel joint enterprises are heated by coke oven gas and blast furnace gas. In the case of changes in the company's gas balance, in order to ensure that the coke oven heating is not affected, it is usually necessary to switch the coke oven heating gas. The commonly used coke oven heating gas switching method is mainly to close the large air cover of the gas regenerator chamber of the rising exhaust gas plate, close the rising coke oven gas addition and subtraction cock, and open the blast furnace gas cyclones one by one to 1 / 2 from the regenerator side of the end of the blast furnace gas branch pipe. After all the rising blast furnace gas cyclones are opened, the blast furnace gas cyclones are opened one by one to full opening, and the other direction operation is performed according to this process after the exchange and reversing. When the first 15-20 blast furnace gas cyclones are opened, due to the high pressure of the blast furnace gas branch pipe, the exhaust gas plate will be positively pressurized and a large amount of gas will leak. During the switching process, operators need to wear air respirators to operate, and the blast furnace gas cyclone needs to be opened twice. The switching operation is high-risk, labor-intensive, and time-consuming, with each switching taking more than 2 hours. Summary of the invention

[0003] The purpose of the present invention is to provide a coke oven heating gas switching method to solve the problems of large gas leakage during the coke oven heating gas switching process, high safety risk and high labor intensity during the operation process.

[0004] The technical scheme of the present invention is: a coke oven heating gas switching method, the device structure used is as follows, including a coke oven gas pipeline, a machine-side blast furnace gas pipeline and a coke-side blast furnace gas pipeline, the coke oven gas pipeline is arranged between the machine-side blast furnace gas pipeline and the coke-side blast furnace gas pipeline, the coke oven gas pipeline is connected in parallel with a coke oven gas branch pipe, every two coke oven gas branch pipes form a group, the coke oven gas branch pipes are provided with regulating cocks and exchange cocks, the machine-side blast furnace gas pipeline and the coke-side blast furnace gas pipeline are provided with blast furnace gas branch pipes, and the blast furnace gas branch pipes are provided with blast furnace gas branch pipe cocks; It also includes a waste gas tray and a combustion chamber. The combustion chamber is provided with a ramp and a vertical fire channel. Every two ramps and one vertical fire channel form a group. The waste tray is provided with a gas side and an air side. A large gas side cover is provided on the top of the gas side. One end of the gas side is connected to the blast furnace gas branch pipe, and the other end of the gas side is connected to a ramp in one of the groups of the combustion chamber. The air side is connected to another ramp in this group. The vertical fire channel in this group is connected to one of the coke oven gas branch pipes in a group, and the vertical fire channel in another group of the combustion chamber is connected to another one of the coke oven gas branch pipes in this group. The two ramps in another group of the combustion chamber are respectively connected to the gas side and air side of the adjacent waste tray.

[0005] The method comprises the following steps: Step 1: Place insulation materials at the air inlet on the gas side of the exhaust gas tray corresponding to the downflow combustion chamber one by one, and lower the gas cover on the gas side and fix it tightly; Step 2: Starting from the end of the coke oven gas pipeline, close the regulating cocks of the descending coke oven gas branch pipes one by one; starting from the ends of the machine-side blast furnace gas pipeline and the coke-side blast furnace gas pipeline, open the cocks of the descending blast furnace gas branch pipes one by one; Step 3: At this time, the descending airflow is changed to the ascending airflow, and the ascending airflow is changed to the descending airflow. According to the methods of steps 1 and 2, the switching operation of changing to the descending airflow is repeated.

[0006] As a further improvement of the present invention, the exchange valves are connected through a switch gas pull rod; the gas side large cover is connected to the shaft through a connecting rod, the shaft is rotatably connected to the switch exhaust gas pull rod, a pin is provided at the connection between the connecting rod and the shaft, and the switch gas pull rod and the switch exhaust gas pull rod are connected to the switch.

[0007] As a further improvement of the present invention, gas drainers are respectively provided at the ends of the coke oven gas pipeline, the machine-side blast furnace gas pipeline and the coke-side blast furnace gas pipeline.

[0008] As a further improvement of the present invention, in step one, the insulation material is asbestos board.

[0009] The beneficial effects of the present invention are as follows: In order to solve the problems existing in the existing coke oven heating gas switching method, the present invention provides a switching method with higher safety, by connecting multiple coke oven gas branch pipes in parallel on the coke oven gas pipeline, and controlling the entry into the coke oven combustion chamber by adjusting the valve; the blast furnace gas branch pipe is controlled by the blast furnace gas branch pipe valve, and enters the coke oven combustion chamber through the exhaust gas disk; the switch controls the opening and closing of the coke oven gas exchange valve and the exhaust gas disk cover by pulling the switch gas pull rod and the switch exhaust gas pull rod to reciprocate, thereby controlling the entry (upward direction) of the coke oven heating gas and the discharge (descending direction) of the exhaust gas.

[0010] This method has the following effects: 1. When the blast furnace gas branch pipe cock is opened in the descending airflow, there will be no problem of positive pressure gas leakage in the local exhaust gas plate after switching, which effectively reduces the safety risk of the switching operation; 2. The blast furnace gas branch pipe cock can be fully opened at one time, and the operating personnel do not need to wear air respirators, but only need to wear gas alarms for detection, which reduces labor intensity and safety risks, shortens the switching time to less than 1 hour, and improves operating efficiency; 3. The occurrence of gas leakage is reduced during the application of this method, saving energy waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1A front view of the device used in the present invention; Figure 2 for Figure 1 AA direction schematic diagram; Figure 3 is a side view of the device used in Example 1 of the present invention; Figure 4 This is a schematic diagram of the structure of the large cover on the gas side of the device used in the present invention.

[0012] In the figure: 1-coke oven gas pipeline; 2-adjusting cock; 3-exchange cock; 4-exchange gas pull rod; 5-blast furnace gas pipeline on the machine side; 6-blast furnace gas branch pipe cock; 7-waste gas plate; 8-gas side; 9-ascending direction; 10-descending direction; 11-connecting rod; 12-pin; 13-large cover on the gas side; 14-exchange gas pull rod; 15-blast furnace gas pipeline on the coke side; 16-combustion chamber; 17-blast furnace gas branch pipe; 18-coke oven gas branch pipe; 19-inclined way; 20-vertical fireway; 21-air side; 22-axis. DETAILED DESCRIPTION

[0013] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0014] Embodiment 1, In this embodiment, six coke oven gas branches 18, four blast furnace gas branches 17, four waste trays 7 and three combustion chambers 16 are provided. Two heating methods, coke oven gas and blast furnace gas, are adopted. The coke oven gas pipeline 1 is distributed in the middle of the coke oven. The coke oven gas enters the combustion chamber 16 through the gas branch corresponding to each combustion chamber 16 via the vertical fire channel 20 for combustion. The pressure of the coke oven gas pipeline 1 is 4-8KPa, and the pressure of the blast furnace gas pipeline is 6-10KPa.

[0015] Each combustion chamber 16 is equipped with two coke oven gas branches 18, namely odd-numbered and even-numbered branches. Each coke oven gas branch pipe 18 is equipped with an adjusting cock 2 and an exchange cock 3. The adjusting cock 2 is used to manually adjust the opening and is kept open during normal use. The exchange cock 3 is connected to the exchanger gas pull rod 4, which reciprocates through the exchanger gas pull rod 4 to open or close the coke oven gas pipeline 1 to periodically control the entry or shutdown of coke oven gas. When the exchange cock 3 of the odd-numbered coke oven gas branch pipe 18 is opened to let in gas, the exchange cock 3 of the even-numbered coke oven gas branch pipe 18 is closed.

[0016] The blast furnace gas pipeline is divided into the machine-side blast furnace gas pipeline 5 and the coke-side blast furnace gas pipeline 15, which are respectively distributed on the coke oven machine side and the coke oven coke side. The blast furnace gas enters the gas side 8 of the exhaust gas plate 7 through the blast furnace gas branch pipe 17, and enters the combustion chamber 16 for combustion after heat storage in the heat storage chamber. Each combustion chamber 16 is equipped with a blast furnace gas branch pipe 17, and each blast furnace gas branch pipe 17 is equipped with a blast furnace gas branch pipe cock 6, which is used to manually control the gas flow of the blast furnace gas branch pipe 17 or open and close it. The blast furnace gas branch pipe cock 6 should be cleaned and refueled before the switching operation, and the sealing should be tight.

[0017] Each exhaust gas plate 7 is divided into two channels, the gas side 8 and the air side 21. There are large air covers on the top of both channels, which are connected to the shaft 22 through the connecting rod 11 and the pin 12. When the large cover 13 on the gas side is dropped, the pin 12 needs to be pulled out to disconnect the connecting rod 11 from the shaft 22. The gas side 8 channel of the exhaust gas plate 7 is connected to the blast furnace gas branch pipe 17 through a short section. Before opening the blast furnace gas branch pipe cock 6, the large cover 13 on the gas side must be dropped and sealed and fixed. The switch exhaust gas pull rod 14 is connected to the large cover 13 on the gas side and the large cover on the air side of the exhaust gas plate 7. The switch exhaust gas pull rod 14 reciprocates to control the opening or closing of the large cover 13 on the gas side. When the gas flow rises, the large cover 13 on the gas side and the large cover on the air side are opened, and the blast furnace gas and air enter the coke oven. When the gas flow falls, the large cover 13 on the gas side and the large cover on the air side are closed, and the exhaust gas in the coke oven is discharged. There are two control modes for the switch: manual switching and automatic switching. The switch should be switched to manual mode before switching operations. During manual switching, the operator needs to control the operation of the switch gas lever 4 and the switch exhaust lever 14 through the switch panel buttons. During automatic switching, the switch is controlled by a solenoid valve and the switching operation is performed regularly according to the set switching time and control program.

[0018] The gas drainer is mainly used for discharging condensate from the coke oven gas pipeline 1, the machine-side blast furnace gas pipeline 5 and the coke-side blast furnace gas pipeline 15. A condensate discharge valve is provided on the gas drainer. The condensate discharge valve is in an open state during normal use. The condensate discharge valve of the gas pipeline must be closed before switching operations.

[0019] The following should also be noted when switching the coke oven heating gas: 1. To avoid gas leakage due to poor sealing of the blast furnace gas branch pipe cock 17 after opening the blast furnace gas branch pipe cock 17, the blast furnace gas branch pipe cock 17 should be checked and oiled one by one before the switching operation; 2. To avoid switching and accidents when the switching operation is not completed, switch the hydraulic switch to manual mode and hang a sign before the switching operation; 3. To avoid gas leakage due to poor sealing of the gas side cover 13 after opening the blast furnace gas branch pipe cock 17, disconnect the connecting rod 11 of the gas side cover 13 of the descending gas exhaust plate 7, install insulation material under the gas side cover 13, specifically asbestos board, and tighten the top screw of the gas side cover 13 to make the gas side cover 13 tightly sealed; 4. After confirming that the gas side cover 13 of the exhaust gas plate 7 has fallen and is tightly sealed, close the regulating cocks 2 leading to the coke oven gas pipeline 1 one by one, open the descending gas flow blast furnace gas branch cock 6, and after manually operating the switch to reverse, the coke oven will enter the normal blast furnace gas heating condition; 5. After adjusting the heating gas flow, restore the condensate discharge valve of the gas drainer.

Claims

1. A method for switching coke oven heating gas, characterized in that: The device used has the following structure, comprising a coke oven gas pipeline (1), a machine-side blast furnace gas pipeline (5) and a coke-side blast furnace gas pipeline (15), wherein the coke oven gas pipeline (1) is arranged between the machine-side blast furnace gas pipeline (5) and the coke-side blast furnace gas pipeline (15), a coke oven gas branch pipe (18) is connected in parallel to the coke oven gas pipeline (1), and every two coke oven gas branch pipes (18) form a group, and the coke oven gas branch pipes (18) are provided with regulating cocks (2) and exchange cocks (3), and the machine-side blast furnace gas pipeline (5) and the coke-side blast furnace gas pipeline (15) are provided with blast furnace gas branch pipes (17), and the blast furnace gas branch pipes (17) are provided with blast furnace gas branch pipe cocks (6); The invention also comprises a waste gas tray (7) and a combustion chamber (16). The combustion chamber (16) is provided with an inclined channel (19) and a vertical fire channel (20). Every two inclined channels (19) and one vertical fire channel (20) form a group. The waste gas tray (7) is provided with a gas side (8) and an air side (21). A large gas side cover (13) is provided on the top of the gas side (8). One end of the gas side (8) is connected to a blast furnace gas branch pipe (17). The other end of the gas side (8) is connected to one inclined channel in one group of the combustion chamber (16). The vertical fire channel (20) in the combustion chamber (16) is connected to one of the coke oven gas branch pipes (18), the air side (21) is connected to another inclined channel (19) in the group, the vertical fire channel (20) in the group is connected to one of the coke oven gas branch pipes (18), the vertical fire channel (20) in another group of the combustion chamber (16) is connected to another of the coke oven gas branch pipes (18), and the two inclined channels (19) in another group of the combustion chamber (16) are respectively connected to the gas side (8) and the air side (21) of the adjacent waste tray (7); The method comprises the following steps: Step 1: Place heat-insulating materials one by one at the air inlet of the gas side (8) of the exhaust gas plate (7) corresponding to the downflow combustion chamber (16), and lower the gas side large cover (13) and fix it tightly; Step 2: Starting from the end of the coke oven gas pipeline (1), close the regulating cocks (2) of the descending coke oven gas branch pipe (18) one by one; starting from the ends of the machine-side blast furnace gas pipeline (5) and the coke-side blast furnace gas pipeline (15), open the cocks (6) of the descending blast furnace gas branch pipe one by one; Step 3: At this time, the descending airflow is changed to the ascending airflow, and the ascending airflow is changed to the descending airflow. According to the methods of steps 1 and 2, the switching operation of changing to the descending airflow after the first switching is repeated.

2. A coke oven heating gas switching method according to claim 1, characterized in that: The exchange cocks (3) are connected to each other via a switch gas pull rod (4); the gas side large cover (13) is connected to a shaft (22) via a connecting rod (11); the shaft (22) is rotatably connected to a switch exhaust gas pull rod (14); a pin (12) is provided at the connection between the connecting rod (11) and the shaft (22); the switch gas pull rod (4) and the switch exhaust gas pull rod (14) are connected to the switch.

3. A coke oven heating gas switching method according to claim 2, characterized in that: Gas drainers are provided at the ends of the coke oven gas pipeline (1), the machine-side blast furnace gas pipeline (5) and the coke-side blast furnace gas pipeline (15), respectively.

4. A coke oven heating gas switching method according to claim 1, characterized in that: In step 1, the insulation material is asbestos board.

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