An automatic ignition system and method for a coke oven

Abstract

The present invention relates to the technical field of raw coke oven gas treatment, and provides a coke oven automatic ignition system, which includes a flap valve arranged in the raw coke oven gas outlet pipe and a pipe cover device at the top, an ignition device for igniting the raw coke oven gas, a contact switch, and a control unit. The control unit is connected to the contact switch, the ignition device, and the pipe cover device. The contact switch is used to detect the opening and closing state of the flap valve, and the control unit controls the ignition device and the pipe cover device according to the state of the contact switch. Through the above technical solution, the problem in the prior art that the operation of manually removing the cover and igniting the raw coke oven gas has a large labor intensity and is not safe enough is solved.

Description

Technical Field

[0001] The invention relates to the technical field of raw gas treatment, and in particular to a coke oven automatic ignition system and method. Background Art

[0002] The coking production process requires that the riser cover be opened and the furnace be aired before pushing the coke, which usually takes 15-30 minutes. During this process, due to the presence of residual volatile matter in the coke and residual raw gas in the carbonization chamber, toxic and harmful smoke will inevitably be emitted into the atmosphere, and the diffusion point of the smoke will change with the change of the furnace number. The main components of the residual raw gas are C, H inorganic substances and a small amount of organic matter. By igniting and burning it, its pollution to the atmosphere can be greatly reduced.

[0003] In the traditional production process, two people are usually required to complete the lid opening and ignition operations. One person controls the lid opening operation of the riser, and the other climbs to the top of the riser and raises a torch to ignite the smoke emitted from the riser. The disadvantage of the above operation is that the labor intensity is high, and if the two people do not cooperate well, it will cause the residual raw gas to escape, and may also cause the "explosion" phenomenon. The "explosion" phenomenon occurs because the position of the riser is relatively high. The moment the cover of the riser is opened, air mixes with the residual raw gas in the riser and reaches the ignition point. At this time, ignition will cause deflagration. Severe "explosion" of the riser can cause damage to the coke oven such as poor sealing of the furnace body and leakage. Summary of the invention

[0004] The invention provides a coke oven automatic ignition system and method, which solves the problem of high labor intensity and insufficient safety in the prior art of raw gas treatment using manual lid-opening and ignition operation.

[0005] The technical solution of the present invention is as follows:

[0006] A coke oven automatic ignition system comprises a flap valve arranged in a raw gas outlet pipe and a pipe cover device on the top, an ignition device for igniting the raw gas, a contact switch and a control unit, wherein the control unit is connected to the contact switch, the ignition device and the pipe cover device, the contact switch is used to detect the opening and closing state of the flap valve, and the control unit controls the ignition device and the pipe cover device according to the state of the contact switch.

[0007] Furthermore, the ignition device includes a power supply and an ignition electrode, the ignition electrode generates heat when powered, and also includes a temperature sensor, the temperature sensor is used to detect the temperature of the ignition electrode, the temperature sensor is connected to the control unit, and the control unit controls the opening of the tube cover device according to the signal of the temperature sensor.

[0008] Further, it also includes a flame sensor for detecting the combustion state of the raw coke oven gas. The flame sensor is connected to the control unit, and the control unit controls the closing of the pipe cover device according to the signal of the flame sensor.

[0009] Further, there are multiple ignition electrodes, which are arranged along the circumferential direction of the raw coke oven gas outlet pipe, and each ignition electrode is along the radial direction of the raw coke oven gas outlet pipe.

[0010] Further, the ignition device also includes a mounting frame and a sliding frame. The mounting frame is arranged on the side wall of the raw coke oven gas outlet pipe. There are multiple sliding frames, which are all slidably arranged on the mounting frame along the radial direction of the raw coke oven gas outlet pipe. The multiple sliding frames are arranged in a circle, and each sliding frame is provided with an ignition electrode.

[0011] Further, there are at least three sliding frames, and it also includes a synchronization mechanism. The synchronization mechanism includes a driving first cylinder, multiple connecting rods and multiple connecting blocks with the same number as the sliding frames. The connecting blocks are slidably arranged on the mounting frame along the radial direction of the raw coke oven gas outlet pipe. The multiple connecting blocks are arranged in a circle, and the connecting blocks and the sliding frames are arranged alternately. The connecting rod is fixedly connected to the sliding frame and is slidably connected to two adjacent connecting blocks. The multiple connecting rods enclose a regular polygon with the same number as the sliding frames, and the driving first cylinder is used to drive one of the sliding frames to slide.

[0012] Further, the pipe cover device includes a cover body and a second cylinder. The cover body is arranged on the top of the raw coke oven gas outlet pipe in a flipping manner and is driven to open and close by the second cylinder.

[0013] An automatic ignition method for a coke oven includes the following steps:

[0014] S1. Close the flap valve to cut off the connection between the coke oven and the raw coke oven gas outlet pipe.

[0015] S2: Turn on the ignition device for pre-preparation before ignition to make the heating electrode reach the ignition temperature.

[0016] S3: Open the pipe cover device to release the raw coke oven gas, and the raw coke oven gas is ignited by the ignition device.

[0017] S4: After the raw coke oven gas is ignited for a period of time, turn off the ignition device.

[0018] S5: After the raw coke oven gas has finished burning, close the pipe cover device and open the flap valve.

[0019] Further, in step S2, the heating electrode is brought close to the nozzle of the raw coke oven gas outlet pipe before ignition, and in step S4, the heating electrode is moved away from the nozzle of the raw coke oven gas outlet pipe after the ignition device is turned off.

[0020] Further, the ignition temperature is 900 - 1100 °C.

[0021] The working principle and beneficial effects of the present invention are as follows:

[0022] The present invention provides a system for igniting the raw coke oven gas. A flap valve is arranged inside the raw gas outlet pipe, and a pipe cover device is arranged at the top. The flap valve is used to disconnect the connection between the raw gas outlet pipe and the coke oven. When the pipe cover device closes the top outlet, it can prevent the raw coke oven gas from being discharged into the atmosphere and avoid environmental pollution. An ignition device is arranged at the top of the raw gas outlet pipe. When the flap valve is closed and the pipe cover device is opened for uncovering and furnace drying, the ignition device can ignite the raw coke oven gas, preventing the direct discharge of the raw coke oven gas into the atmosphere and polluting the environment. In order to achieve automatic control, a contact switch and a control unit are also provided. The contact switch can detect the opening and closing state of the flap valve. When the flap valve is in the closed state, the control unit sends a signal to the ignition device, and the ignition device starts to work. Then, it sends a signal to the pipe cover device to open the top outlet. When the raw coke oven gas is discharged from the pipe, the ignition device can quickly ignite the raw coke oven gas, thus preventing the direct discharge of the raw coke oven gas into the atmosphere. Through the above scheme, full-automatic control and automatic ignition can be realized, effectively reducing the labor intensity of workers and ensuring safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described in detail below with reference to the drawings and specific embodiments.

[0024] Figure 1 Structural schematic of the present invention Figure 1 ;

[0025] Figure 2 Structural schematic of the present invention Figure 2 ;

[0026] Figure 3 Top view structural schematic of the present invention;

[0027] Figure 4 Control structural schematic of the present invention;

[0028] In the figure: 1, raw gas outlet pipe; 2, flap valve; 3, pipe cover device, 31, cover body, 32, second cylinder; 4, ignition device, 41, power supply, 42, ignition electrode, 43, mounting bracket, 44, sliding bracket; 5, contact switch; 6, control unit; 7, temperature sensor; 8, flame sensor; 9, synchronization mechanism, 91, first cylinder, 92, connecting rod, 93, connecting block. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] Next, in combination with the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be described clearly and completely. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0030] As Figures 1 to 4 shown, this embodiment provides

[0031] An automatic ignition system for a coke oven, including a flap valve 2 disposed in the raw gas outlet pipe 1 and a pipe cover device 3 at the top, an ignition device 4 for igniting the raw gas, a contact switch 5, and a control unit 6. The control unit 6 is connected to the contact switch 5, the ignition device 4, and the pipe cover device 3. The contact switch 5 is used to detect the opening and closing state of the flap valve 2, and the control unit 6 controls the ignition device 4 and the pipe cover device 3 according to the state of the contact switch 5.

[0032] This embodiment provides a system for igniting the raw gas of a coke oven. A flap valve 2 is disposed inside the raw gas outlet pipe 1, and a pipe cover device 3 is provided at the top. The flap valve 2 is used to disconnect the connection between the raw gas outlet pipe 1 and the coke oven. When the pipe cover device 3 closes the top outlet, it can prevent the raw gas from being discharged into the atmosphere and avoid environmental pollution. An ignition device 4 is provided at the top of the raw gas outlet pipe 1. When the flap valve 2 is closed and the pipe cover device 3 is opened for uncovering and furnace cooling, the ignition device 4 can ignite the raw gas to avoid the direct discharge of the raw gas into the atmosphere and environmental pollution. For automatic control, a contact switch 5 and a control unit 6 are also provided. The contact switch 5 can detect the opening and closing state of the flap valve 2. When the flap valve 2 is in the closed state, the control unit 6 sends a signal to the ignition device 4, and the ignition device 4 starts to work. Then, it sends a signal to the pipe cover device 3 to open the top outlet. When the raw gas is discharged from the pipe, the ignition device 4 can quickly ignite the raw gas to avoid the direct discharge of the raw gas into the atmosphere. Through the above solution, full-automatic control and automatic ignition can be achieved, effectively reducing the labor intensity of workers and ensuring safety.

[0033] The ignition device 4 includes a power supply 41 and an ignition electrode 42. The ignition electrode 42 generates heat when energized. It also includes a temperature sensor 7. The temperature sensor 7 is used to detect the temperature of the ignition electrode 42. The temperature sensor 7 is connected to the control unit 6, and the control unit 6 controls the opening of the pipe cover device 3 according to the signal of the temperature sensor 7.

[0034] In this embodiment, heating ignition is adopted. After the flap valve 2 is closed, the control unit 6 controls the power supply 41 to be connected to the ignition electrode 42, so that the ignition electrode 42 generates heat. The ignition electrode 42 is a nano-blackbody electrode, which can instantly generate heat and turn red after being powered on, reaching a temperature above 1000°C. The temperature sensor 7 can detect the temperature of the ignition electrode 42, avoiding the problem that the tube cover device 3 is opened when the ignition electrode 42 of the ignition device 4 fails to reach the ignition temperature. According to the detected temperature of the temperature sensor 7, the control unit 6 controls the tube cover device 3 to open, which is safer and avoids environmental pollution.

[0035] It further includes a flame sensor 8. The flame sensor 8 is used to detect the combustion state of the raw coal gas. The flame sensor 8 is connected to the control unit 6, and the control unit 6 controls the tube cover device 3 to close according to the signal of the flame sensor 8.

[0036] In this embodiment, the combustion state of the raw coal gas is detected by the flame sensor 8. After the raw coal gas is completely burned and the flame goes out, the flame sensor 8 sends a signal to control the tube cover device 3 to close, realizing the full automation control of the whole process.

[0037] Each control module of the control unit 6 of this system is interlocked with the contact switch 5. Only when the contact switch 5 indicates that the flap valve 2 is in the closed state can each control module work according to a certain process. If a fault occurs in a certain process in the middle, the subsequent process execution will be interrupted, especially the opening of the pipe wall of the flap valve 2 and the tube cover device 3. Among them, the form of the contact switch 5 is used to detect the switch state of the flap valve 2, which is more stable. For the opening of the tube cover device 3, a temperature sensor 7 is additionally set to judge whether the ignition device 4 reaches the ignition state. When controlling the tube cover device 3 to open, it is safer.

[0038] There are multiple ignition electrodes 42. The multiple ignition electrodes 42 are arranged along the circumferential direction of the raw coal gas outlet pipe 1, and each ignition electrode 42 is along the radial direction of the raw coal gas outlet pipe 1.

[0039] The ignition device 4 further includes a mounting frame 43 and a sliding frame 44. The mounting frame 43 is arranged on the side wall of the raw coal gas outlet pipe 1. There are multiple sliding frames 44, and they are all slidably arranged on the mounting frame 43 along the radial direction of the raw coal gas outlet pipe 1. The multiple sliding frames 44 are arranged in a circle, and each sliding frame 44 is provided with an ignition electrode 42.

[0040] In this embodiment, arranging a plurality of ignition electrodes 42 in the circumferential direction of the raw coal gas outlet pipe 1 can stably achieve the ignition of the raw coal gas. The number of ignition electrodes 42 required is selected according to the diameter of the raw coal gas outlet pipe 1. The larger the diameter of the raw coal gas outlet pipe 1, the more ignition electrodes 42 are used. Each ignition electrode 42 is slidably arranged on the mounting frame 43 along the radial direction of the raw coal gas outlet pipe 1 through a sliding frame 44. This is to adjust the position of the ignition electrode 42 after ignition. Since the high temperature generated by the energization of the ignition electrode 42 is used to ignite the raw coal gas in this embodiment, there is a problem that the ignition electrode 42 is too close to the combustion position after ignition. Being burned by the flame will greatly reduce the service life of the ignition electrode 42. Therefore, after the ignition electrode 42 completes ignition, the sliding frame 44 drives the ignition electrode 42 to move outward, away from the combustion position, which can effectively improve the service life of the ignition electrode 42 and the service life of the system.

[0041] There are at least three sliding frames 44, and a synchronization mechanism 9 is further included. The synchronization mechanism 9 includes a driving first cylinder 91, a plurality of connecting rods 92 and a plurality of connecting blocks 93 with the same number as the sliding frames 44. The connecting blocks 93 are slidably arranged on the mounting frame 43 along the radial direction of the raw coal gas outlet pipe 1. The plurality of connecting blocks 93 are arranged in a circle, and the connecting blocks 93 and the sliding frames 44 are arranged alternately. The connecting rods 92 are fixedly connected to the sliding frames 44 and are slidably connected to two adjacent connecting blocks 93. The plurality of connecting rods 92 enclose a regular polygon with the same number as the sliding frames 44, and the driving first cylinder 91 is used to drive one of the sliding frames 44 to slide.

[0042] In this embodiment, a synchronization mechanism 9 that can simultaneously drive several sliding frames 44 to move synchronously is proposed. By driving the synchronization mechanism 9, the control is simplified. Taking four sliding frames 44 as an example, the synchronization mechanism 9 includes four connecting rods 92 and four connecting blocks 93. The four connecting blocks 93 are evenly arranged on the circumference of the raw coal gas outlet pipe 1 and all slide along the radial direction. The sliding rod passes through two adjacent connecting blocks 93 and slides relative to two opposite connecting blocks 93. The four connecting rods 92 enclose a square. In this way, using the principle of similarity of regular polygons, by sliding any one of the connecting blocks 93, the entire structure can be enlarged or reduced. Then, the middle part of the connecting rod 92 is fixedly connected to the sliding frame 44, and a first cylinder 91 is used to connect one of the sliding frames 44, the connecting rod 92 or the connecting block 93. In this way, several sliding frames 44 can be synchronously moved closer or farther away by driving with one first cylinder 91, that is, the ignition electrodes 42 can be synchronously moved closer or farther away.

[0043] The pipe cover device 3 includes a cover body 31 and a second cylinder 32. The cover body 31 is arranged on the top of the raw coal gas outlet pipe 1 in a flipping manner and is driven to open and close by the second cylinder 32.

[0044] An automatic ignition method for a coke oven, comprising the following steps:

[0045] S1. Close the flap valve 2 to cut off the connection between the coke oven and the raw gas outlet pipe 1;

[0046] S2: Turn on the ignition device 4 to perform pre-preparation before ignition, so that the temperature of the heating electrode reaches the ignition temperature;

[0047] S3: Open the pipe cover device 3 to release the raw gas, and the raw gas is ignited by the ignition device 4;

[0048] S4: After the raw gas is ignited for a period of time, turn off the ignition device 4;

[0049] S5: After the raw gas burns out, close the pipe cover device 3 and open the flap valve 2.

[0050] In step S2, before ignition, the heating electrode is close to the nozzle of the raw gas outlet pipe 1, and in step S4, after turning off the ignition device 4, the heating electrode is far away from the nozzle of the raw gas outlet pipe. The ignition temperature is 900 - 1100 °C.

[0051] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An automatic ignition system for a coke oven, characterized in that, it includes a flap valve (2) arranged in the raw gas outlet pipe (1) and a pipe cover device (3) at the top, an ignition device (4) for igniting the raw gas, a contact switch (5) and a control unit (6). The control unit (6) is connected to the contact switch (5), the ignition device (4) and the pipe cover device (3). The contact switch (5) is used to detect the opening and closing state of the flap valve (2), and the control unit (6) controls the ignition device (4) and the pipe cover device (3) according to the state of the contact switch (5); the ignition device (4) includes a power supply (41) and an ignition electrode (42). The ignition electrode (42) is energized to generate heat. It also includes a temperature sensor (7). The temperature sensor (7) is used to detect the temperature of the ignition electrode (42). The temperature sensor (7) is connected to the control unit (6), and the control unit (6) controls the opening of the pipe cover device (3) according to the signal of the temperature sensor (7); there are multiple ignition electrodes (42). The multiple ignition electrodes (42) are arranged along the circumferential direction of the raw gas outlet pipe (1), and each ignition electrode (42) is along the radial direction of the raw gas outlet pipe (1); the ignition device (4) further includes a mounting frame (43) and a sliding frame (44). The mounting frame (43) is arranged on the side wall of the raw gas outlet pipe (1). There are multiple sliding frames (44), and they are all slidably arranged on the mounting frame (43) along the radial direction of the raw gas outlet pipe (1). The multiple sliding frames (44) are arranged in a circle, and each sliding frame (44) is provided with the ignition electrode (42); there are at least three sliding frames (44), and it further includes a synchronization mechanism (9). The synchronization mechanism (9) includes a driving first cylinder (91), multiple connecting rods (92) with the same number as the sliding frames (44), and multiple connecting blocks (93). The connecting blocks (93) are slidably arranged on the mounting frame (43) along the radial direction of the raw gas outlet pipe (1). The multiple connecting blocks (93) are arranged in a circle, and the connecting blocks (93) and the sliding frames (44) are arranged alternately. The connecting rod (92) is fixedly connected to the sliding frame (44), and the connecting rod (92) is slidably connected to two adjacent connecting blocks (93). The multiple connecting rods (92) enclose a regular polygon with the same number as the sliding frames (44), and the driving first cylinder (91) is used to drive one of the sliding frames (44) to slide.

2. The automatic ignition system for a coke oven according to claim 1, characterized in that, it further includes a flame sensor (8). The flame sensor (8) is used to detect the combustion state of the raw gas. The flame sensor (8) is connected to the control unit (6), and the control unit (6) controls the closing of the pipe cover device (3) according to the signal of the flame sensor (8).

3. The automatic ignition system for a coke oven according to claim 1, characterized in that, The pipe cover device (3) includes a cover body (31) and a second cylinder (32). The cover body (31) is arranged at the top of the raw gas outlet pipe (1) in a flipping manner and is driven to open and close by the second cylinder (32).

4. The ignition method of a coke oven automatic ignition system according to claim 1, characterized in that, it includes the following steps: S1. Close the flap valve (2) to cut off the connection between the coke oven and the raw gas outlet pipe (1); S2: Open the ignition device (4) to perform pre-preparation before ignition to make the temperature of the heating electrode reach the ignition temperature; S3: Open the pipe cover device (3) to release the raw gas, and the raw gas is ignited by the ignition device (4); S4: After the raw gas is ignited for a period of time, close the ignition device (4); S5: After the raw gas burns out, close the pipe cover device (3) and open the flap valve (2).

5. The ignition method of a coke oven automatic ignition system according to claim 4, characterized in that, in step S2, the heating electrode is close to the nozzle of the raw gas outlet pipe (1) before ignition, and in step S4, the heating electrode is far away from the nozzle of the raw gas outlet pipe after closing the ignition device (4).

6. The ignition method of a coke oven automatic ignition system according to claim 4, characterized in that, the ignition temperature is 900 - 1100 °C.

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