Combustion device, scrap steel baking apparatus, and cleaning method

Abstract

The present application relates to a kind of combustion device, scrap steel baking equipment and cleaning method, combustion device includes burner, gas pipe, cleaning unit and detection unit.The one end of gas pipe is used to be connected with coke oven, and the other end is connected with the burner;Cleaning unit includes cleaning pipe, gas holder and water reservoir, gas holder and water reservoir are all communicated with gas pipe by cleaning pipe, so that gas holder and water reservoir can respectively input compressed air and cleaning fluid in gas pipe;Detection unit is connected with cleaning unit, and detection unit is used to detect the fire size of burner.When a certain amount of impurities is accumulated in gas pipe, the gas pipe is cleaned by cleaning unit.To remove the impurities in gas pipe.Through timely cleaning, it can avoid that impurities are accumulated in pipe in large quantities and affect the flow rate of coal gas, and avoid that impurities cause the blockage of the gas hole of burner, so that burner can maintain corresponding fire, guarantee the preheating efficiency of scrap steel.

Description

Technical Field

[0001] This invention relates to the field of metallurgical technology, and in particular to a combustion device, a scrap steel baking equipment, and a cleaning method for the scrap steel baking equipment. Background Technology

[0002] In steelmaking, scrap steel is typically added to the ore to achieve its recycling. Before entering the furnace, the scrap steel needs to be preheated. One existing scrap steel baking device includes a transport vehicle, a track, a ladle, and a combustion device. The track connects the scrap steel baking device to the furnace, and the transport vehicle carries the ladle containing the scrap steel. The transport vehicle moves the ladle to the heating station, where the combustion device heats the scrap steel with a flame. The heated scrap steel is then transported along the track to the furnace via the transport vehicle. Typically, the combustion device uses coke oven gas as fuel, and the two are connected via a gas pipeline for transporting the gas.

[0003] The existing technology has the following shortcomings: the gas produced by coke ovens contains gaseous tar and coal dust impurities. During the gas transportation process, the gaseous tar condenses and adheres to the coal dust impurities, sticking to the pipe wall of the gas pipeline and clogging the burner vents in the combustion device, affecting the burner's flame intensity and thus the preheating efficiency of the scrap steel. Summary of the Invention

[0004] The purpose of this invention is to provide a combustion device, a scrap steel baking equipment, and a cleaning method, which can clean the gas supply pipe, prevent the gas supply pipe from becoming blocked, and ensure the preheating efficiency of the scrap steel.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A combustion device is provided, comprising:

[0007] Burner, used to bake scrap steel;

[0008] A gas pipeline, one end of which is connected to a coke oven to receive the gas produced by the coke oven, and the other end of which is connected to a burner to input the gas into the burner;

[0009] A cleaning unit includes a cleaning pipe, an air reservoir, and a water reservoir. The air reservoir and the water reservoir are both connected to the air supply pipe through the cleaning pipe, so that the air reservoir and the water reservoir can respectively input compressed air and cleaning fluid into the air supply pipe.

[0010] The detection unit is communicatively connected to the cleaning unit and is used to detect the flame size of the burner.

[0011] Furthermore, the gas supply pipe includes a U-shaped pipe section located at one end near the burner, with the two ports of the U-shaped pipe section located at the top of the U-shaped pipe section.

[0012] Furthermore, there are multiple U-shaped pipe segments, which are distributed at intervals along the length of the gas transmission pipe.

[0013] Furthermore, the gas transmission pipe includes a first pipe segment and a second pipe segment. There are multiple first pipe segments arranged sequentially along the length of the gas transmission pipe. The two ends of the second pipe segment are respectively connected to two adjacent first pipe segments. The inner diameter of the second pipe segment is larger than the inner diameter of the first pipe segment.

[0014] Furthermore, the second pipe section is set horizontally.

[0015] Furthermore, the detection unit includes an industrial CCD camera and a server. The industrial CCD camera is located on one side of the burner in the horizontal direction and is used to capture flame images of the burner. The server is communicatively connected to the industrial CCD camera to receive and process flame image data. The cleaning unit is communicatively connected to the server.

[0016] Furthermore, the detection unit also includes a solid color plate, which is disposed opposite to the industrial CCD camera, and the burner is located between the solid color plate and the industrial CCD camera.

[0017] A scrap steel baking device is also provided, including a transport vehicle, a molten iron ladle, a track, and a combustion device. The combustion device is located above the track. The molten iron ladle is used to hold scrap steel. The transport vehicle carries the molten iron ladle along the extension direction of the track and enables the molten iron ladle to move directly below the burner.

[0018] A cleaning method is also provided for cleaning scrap steel baking equipment, comprising the following steps:

[0019] Step S10: Periodically check the flame size of the combustion device when it is in the pilot flame state. When the flame size of the combustion device is lower than the set value, turn off the pilot flame of the combustion device.

[0020] Step S20: The transport vehicle carries the empty molten iron ladle to a position directly below the burner of the combustion device;

[0021] Step S30: Introduce cleaning fluid into the gas supply pipe of the combustion device, soaking time T1;

[0022] Step S40: Input compressed air into the air supply pipe, pressurization time T2;

[0023] Step S50: Open the valve at the outlet end of the gas pipeline to allow the cleaning fluid in the gas pipeline to be discharged into the molten iron ladle.

[0024] Furthermore, time T1 ≥ 20 minutes, and / or time T2 ≥ 5 minutes.

[0025] The advantages of this invention compared to the prior art are:

[0026] This invention discloses a combustion device, scrap steel baking equipment, and cleaning method. By incorporating a detection unit, the burner's flame intensity is periodically monitored, and data on the blockage status of the gas supply pipe is obtained promptly. When a certain amount of impurities accumulates in the gas supply pipe, the cleaning unit cleans the pipe. This involves introducing cleaning fluid and compressed air into the gas supply pipe to remove impurities. Timely cleaning prevents the excessive accumulation of impurities in the pipe, which could affect the gas flow rate, and also prevents impurities from clogging the burner's orifices, allowing the burner to maintain a suitable flame intensity and ensuring efficient preheating of the scrap steel. Attached Figure Description

[0027] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0028] Figure 1 This is a schematic diagram of a combustion device according to an embodiment of the present invention.

[0029] Figure 2 This is a partial cross-sectional view of the gas transmission pipe according to an embodiment of the present invention.

[0030] Figure 3 This is a schematic diagram of a scrap steel baking device according to an embodiment of the present invention.

[0031] In the picture:

[0032] 1. Burner; 2. Gas supply pipe; 21. First pipe section; 22. Second pipe section; 23. U-shaped pipe section; 24. First valve; 25. Second valve; 3. Cleaning unit; 31. First cleaning pipe; 32. Second cleaning pipe; 33. Water tank; 34. Gas tank; 4. Detection unit; 41. Industrial CCD camera; 42. Solid color plate; 5. Transport vehicle; 6. Ladle; 7. Track. Detailed Implementation

[0033] To make the technical problems solved by the present invention, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0034] like Figure 1 and Figure 2As shown, this invention provides a combustion device for preheating scrap steel. The fuel for the combustion device is coke oven gas. The device preheats the scrap steel by flame heating to a suitable temperature for entry into the smelting furnace. The combustion device includes a burner 1, a gas supply pipe 2, a cleaning unit 3, and a detection unit 4. The burner 1 is existing technology, generating a flame by burning coke oven gas to heat the scrap steel. The gas supply pipe 2 transports coke oven gas; one end of the pipe is connected to the coke oven to receive the gas. The other end is connected to the burner 1 to supply gas to the burner 1. The cleaning unit 3 cleans the gas supply pipe 2. When a large amount of impurities accumulate in the pipe 2, the cleaning unit 3 cleans the pipe 2 to remove these impurities. The impurities mainly include condensed tar in the coke oven gas and coal dust carried in the gas. The coal dust adheres to the condensed tar and is bonded to the wall of the gas supply pipe 2. The detection unit 4 is used to detect the flame size of the burner 1 to determine the timing of cleaning the gas supply pipe 2. The detection unit 4 is communicatively connected to the cleaning unit 3 to control the start and stop of the cleaning unit 3.

[0035] The cleaning unit 3 includes a cleaning pipe, an air reservoir 34, and a water reservoir 33. Both the air reservoir 34 and the water reservoir 33 are connected to the air supply pipe 2 via the cleaning pipe. The water reservoir 33 contains cleaning fluid, which can be water or water with added detergent. The water reservoir 33 supplies cleaning fluid to the air supply pipe 2. The air reservoir 34 contains compressed air and supplies compressed air to the air supply pipe 2. Specifically, the cleaning pipe includes a first cleaning pipe 31 and a second cleaning pipe 32. The water reservoir 33 is connected to the air supply pipe 2 via the first cleaning pipe 31, and the air reservoir 34 is connected to the air supply pipe 2 via the second cleaning pipe 32. Correspondingly, valves for controlling the on / off state of the pipes are installed on the first cleaning pipe 31 and the second cleaning pipe 32. A water pump is installed on the first cleaning pipe 31 to drive the cleaning fluid into the air supply pipe 2; the compressed air in the air reservoir 34 can enter the air supply pipe 2 under its own pressure. In practical applications, when a certain amount of impurities accumulate in the gas supply pipe 2, cleaning fluid can be introduced into the gas supply pipe 2 to soak and clean the pipe wall. Compressed air can also be used to clean the pipe wall. Cleaning the gas supply pipe 2 prevents impurities from accumulating excessively and affecting the gas flow rate, and also prevents impurities from clogging the gas vents of the burner 1, ensuring that the burner 1 can maintain a suitable flame and guarantee the preheating efficiency of the scrap steel.

[0036] Optionally, impurities tend to accumulate at the end of the gas transmission pipe 2 near the burner 1. Because the gas exiting the coke oven is at a high temperature, tar condensation is less likely to occur at the end of the gas transmission pipe 2 near the coke oven. When the gas is delivered to the area near the burner 1, as the gas temperature decreases, the tar condenses and mixes with and adheres to the coal dust. Therefore, in this embodiment, the cleaning unit 3 mainly cleans the section of the gas transmission pipe 2 where impurities are prone to deposit. Correspondingly, a first valve 24 and a second valve 25 are provided on the gas transmission pipe 2. The second valve 25 is near the burner 1, and the section where impurities are prone to deposit is located between the first valve 24 and the second valve 25. The connection points of the first cleaning pipe 31 and the second cleaning pipe 32 with the gas transmission pipe 2 are located between the first valve 24 and the second valve 25.

[0037] Optionally, the gas transmission pipe 2 includes a first pipe section 21, a second pipe section 22, and a U-shaped pipe section 23. The first pipe section 21 is the main component of the gas transmission pipe 2, and its diameter is 15-30 mm. There are multiple first pipe sections 21, which are arranged sequentially along the length of the gas transmission pipe 2 so that a second pipe section 22 or a U-shaped pipe section 23 can be installed between two adjacent first pipe sections 21. The U-shaped pipe section 23 has a "U" shape and includes two ports and a bend, which is a 180° bend. The two ports of the U-shaped pipe section 23 are respectively connected to the ends of two adjacent first pipe sections 21. The two ports of the U-shaped pipe section 23 are located at the top of the entire U-shaped pipe section 23, and the bend is located at the bottom of the entire U-shaped pipe section 23. This structure ensures that when the gas flows through the U-shaped bend, the gas path is downward to the bend and then upward to the ports. During this process, condensed tar, coal dust, and other impurities easily adhere to the U-shaped pipe section 23, thereby reducing or preventing a large amount of impurities from flowing to the burner 1. It is understandable that the pore size of the gas in the burner 1 is smaller, and the piping structure within the burner 1 is more complex than that of the gas supply pipe 2; therefore, cleaning the burner 1 when impurities accumulate is more difficult. To further retain impurities within the gas supply pipe 2 and prevent them from flowing to the burner 1, multiple U-shaped pipe sections 23 are provided, spaced apart along the length of the gas supply pipe 2. The coal gas can flow sequentially through multiple U-shaped pipe sections 23, promoting the adhesion of impurities within them.

[0038] The second pipe section 22 is horizontally arranged, with both ends connected to the ends of two adjacent first pipe sections 21. The inner diameter of the second pipe section 22 is larger than that of the first pipe section 21. Correspondingly, the first pipe section 21 has a horizontally arranged section, allowing the second pipe section 22 to be horizontally installed in the gas transmission pipe 2. It is understood that as pulverized coal in the gas moves along the gas transmission pipe 2, it gradually becomes large particles of impurities due to the binding effect of condensed tar. These impurities gradually accumulate at the bottom of the inner wall of the gas transmission pipe 2 under gravity. Simultaneously, under the scouring effect of the gas, impurities not bonded to the pipe wall move with the airflow. In this embodiment, by setting a second pipe section 22 with a larger inner diameter, a step is formed at the junction of the second pipe section 22 and the first pipe section 21 to block impurities moving along the gas flow. This makes it easier for impurities to accumulate at the bottom of the second pipe section 22 as they flow through it, preventing them from continuously moving along the gas transmission pipe 2 into the burner 1. Of course, in order to further allow impurities to accumulate in the second pipe section 22 and prevent impurities from flowing to the burner 1, multiple second pipe sections 22 are provided, and the multiple second pipe sections 22 are distributed at intervals along the length of the gas transmission pipe 2.

[0039] In this embodiment, refer to Figure 1 As shown, the gas supply pipe 2 is equipped with both a second pipe section 22 and a U-shaped pipe section 23 to prevent impurities from flowing to the burner 1. Of course, in other embodiments, only the second pipe section 22 or only the U-shaped pipe section 23 may be provided in the gas supply pipe 2. Both the second pipe section 22 and the U-shaped pipe section 23 are located between the first valve 24 and the second valve 25.

[0040] Optionally, the detection unit 4 includes an industrial CCD camera 41, a solid color plate 42, a server, and a communication module. The industrial CCD camera 41 communicates with the server via the communication module, which is used for data transmission, including wired and wireless transmission. Both the industrial CCD camera 41 and the server are existing technologies. The industrial CCD camera 41 is installed on one side of the burner 1 in the horizontal direction and is used to capture flame images of the burner 1. The flame image data from the industrial CCD camera 41 is transmitted to the server using the communication module. The server receives the flame image data and analyzes and processes it to determine the size of the flame in the burner 1. For example, in this embodiment, the logic for determining the size of the flame is to use existing image processing technology to determine whether the flame length L of the burner 1 meets the set value. When the flame length L of the burner 1 exceeds the set value, it indicates that the flame of the burner 1 is normal; when the flame length L of the burner 1 is less than the set value, it indicates that the flame of the burner 1 is too small, and the gas supply pipe 2 is blocked by impurities, affecting the gas flow rate. The cleaning unit 3 and the burner 1 are both connected to the server via the communication module. When the flame length L of burner 1 is less than the set value, the combustion device needs to be cleaned. The server sends commands to burner 1 and cleaning unit 3 to shut down burner 1 and start cleaning unit 3 for cleaning.

[0041] A solid color plate 42 is positioned opposite the industrial CCD camera 41, with the burner 1 located between them. The color of the solid color plate 42 has a significant color difference from the flame color; for example, the solid color plate 42 can be painted green or black. By setting the solid color plate 42, the color difference between the flame and the image background is improved, and the image influence of other devices in the environment is eliminated, thus facilitating image processing.

[0042] It should be noted that burner 1 has a pilot light state and a high-fire state. In the pilot light state, the gas flow rate is relatively small, only keeping burner 1 in a burning state to prevent the flame from going out. In the high-fire state, the gas flow rate is relatively large, and in this state, burner 1 heats the scrap steel.

[0043] Specifically, the combustion device also includes a supporting steel structure, on which the burner 1, gas supply pipe 2, cleaning unit 3 and detection unit 4 are all installed.

[0044] like Figure 3As shown, a scrap steel baking device is also provided, including a combustion device, a transport vehicle 5, molten iron ladles 6, and a track 7. The track 7 connects the scrap steel baking device to the smelting furnace. The transport vehicle 5 is a freight train used to transport scrap steel. The molten iron ladles 6 are used to transport molten iron, molten steel, etc. In practical applications, the molten iron ladles 6 are directly used to load scrap steel. Multiple molten iron ladles 6 are mounted on the transport vehicle 5. Burners 1 are located above the track 7, and there are multiple burners 1 arranged sequentially along the length of the track 7. The spacing between two adjacent burners 1 matches the spacing of the molten iron ladles 6 on the transport vehicle 5. The number and position of the burners 1 match the number and position of the molten iron ladles 6. In practical applications, the transport vehicle 5 carries the molten iron ladles 6 along the extension direction of the track 7. During scrap steel preheating, the molten iron ladles 6 move to directly below the burners 1. The burners 1 spray flames downwards to heat the scrap steel inside the molten iron ladles 6. After preheating, the transport vehicle 5 transports the molten iron ladles 6 to the smelting furnace.

[0045] By installing a cleaning unit 3 in the combustion device, when the gas supply pipe 2 of the combustion device is blocked, the cleaning unit 3 can be used to clean the burner 1 and the gas supply pipe 2 in a timely manner to remove impurities such as condensed tar and coal dust inside, so as to avoid affecting the flame size of the burner 1 due to the blockage of the gas supply pipe 2 and ensure the preheating efficiency of scrap steel.

[0046] like Figure 1 and Figure 3 As shown, a cleaning method is also provided for cleaning scrap steel baking equipment. Specifically, it includes the following steps:

[0047] Step S10: Periodically check the flame size of the combustion device in the pilot light state. When the flame size is lower than the set value, shut off the pilot light. Specifically, set a suitable detection cycle, such as once a day, once a week, or once a month. After the scrap steel is preheated, adjust the gas flow rate of burner 1 to switch burner 1 from the high flame state to the pilot light state, i.e., keep burner 1 from going out. At this time, use detection unit 4 to detect the flame size of burner 1, i.e., detect the length of the pilot light flame. When the flame length value L is lower than the set value, it indicates that the gas supply pipe 2 is blocked, and shut off the pilot light of burner 1 for cleaning.

[0048] Step S20: The transport vehicle moves the empty molten iron ladle 6 to directly below the burner 1 of the combustion device. The empty molten iron ladle 6 is used to receive the waste liquid after cleaning.

[0049] Step S30: Close the first valve 24 and the second valve 25 on the gas supply pipe 2, making the area between the first valve 24 and the second valve 25 on the gas supply pipe 2 closed. Open the valve of the first cleaning pipe 31 and start the water pump on the first cleaning pipe 31 to introduce cleaning solution into the gas supply pipe 2 for a soaking time T1. It is understood that soaking the pipe wall of the gas supply pipe 2 for a certain period of time helps to soften impurities for cleaning. The soaking time T1 is set to 20 minutes or more.

[0050] Step S40: Open the valve on the second cleaning pipe 32 to input compressed air into the air supply pipe 2, with a pressure holding time T2. By inputting compressed air, the pressure inside the air supply pipe 2 is increased to promote the removal of impurities. The pressure holding time T2 is set to 5 minutes or more.

[0051] Step 50: Open the second valve 25 on the gas supply pipe 2, thus opening the outlet end of the gas supply pipe 2. The cleaning fluid in the gas supply pipe 2 is discharged into the molten iron ladle 6. Understandably, the pressure of compressed air increases the flow rate of the cleaning fluid, promoting cleaning of the pipe wall of the gas supply pipe 2. During the discharge of the cleaning fluid, the cleaning fluid simultaneously cleans the gas vents of the burner 1. The discharged cleaning fluid is collected by the molten iron ladle 6 below. In practical applications, the valves on the gas supply pipe 2 and the valves in the cleaning unit 3 can be configured as solenoid valves, and all valves are connected to a server to achieve automatic cleaning control.

[0052] The beneficial effects of this embodiment are as follows: By setting up the detection unit 4, the flame intensity of the burner 1 can be detected periodically, and data on the blockage status of the gas supply pipe 2 can be obtained in a timely manner. When a certain amount of impurities accumulate in the gas supply pipe 2, the gas supply pipe 2 is cleaned by the cleaning unit 3. That is, cleaning fluid and compressed air are introduced into the gas supply pipe 2 to remove impurities. Through timely cleaning, it is possible to avoid the large accumulation of impurities in the pipe, which would affect the gas flow rate, and to avoid impurities clogging the gas holes of the burner 1, so that the burner 1 can maintain the corresponding flame intensity and ensure the preheating efficiency of the scrap steel.

[0053] The above description is only a preferred embodiment of the present invention. For those skilled in the art, there will be changes in the specific implementation and application scope based on the ideas of the present invention. The content of this specification should not be construed as a limitation of the present invention.

Claims

1. A combustion device, characterized in that, include: Burner, used to bake scrap steel; A gas transmission pipe has one end connected to a coke oven to receive the gas produced by the coke oven, and the other end connected to a burner to input the gas into the burner; the gas transmission pipe includes a U-shaped pipe section located at one end near the burner, with two ports at the top of the U-shaped pipe section; there are multiple U-shaped pipe sections, which are spaced apart along the length of the gas transmission pipe; the gas transmission pipe includes a first pipe section and a second pipe section, with multiple first pipe sections arranged sequentially along the length of the gas transmission pipe, and the two ends of the second pipe section connected to two adjacent first pipe sections respectively, with the inner diameter of the second pipe section being larger than the inner diameter of the first pipe section; The second pipe section is set horizontally; A cleaning unit includes a cleaning pipe, an air reservoir, and a water reservoir. The air reservoir and the water reservoir are both connected to the air supply pipe through the cleaning pipe, so that the air reservoir and the water reservoir can respectively input compressed air and cleaning fluid into the air supply pipe. The detection unit is communicatively connected to the cleaning unit and is used to detect the flame size of the burner.

2. The combustion device according to claim 1, characterized in that, The detection unit includes an industrial CCD camera and a server. The industrial CCD camera is located on one side of the burner in the horizontal direction and is used to capture flame images of the burner. The server is communicatively connected to the industrial CCD camera to receive and process flame image data. The cleaning unit is communicatively connected to the server.

3. The combustion device according to claim 2, characterized in that, The detection unit also includes a solid color plate, which is positioned opposite to the industrial CCD camera, and the burner is located between the solid color plate and the industrial CCD camera.

4. A scrap steel baking device, characterized in that, The device includes a transport vehicle, a ladle of molten iron, a track, and a combustion device as described in any one of claims 1 to 3, wherein the combustion device is located above the track, the ladle of molten iron is used to contain scrap steel, and the transport vehicle carries the ladle of molten iron along the extension direction of the track, enabling the ladle of molten iron to move directly below the burner.

5. A cleaning method for cleaning the scrap steel baking equipment as described in claim 4, characterized in that, Includes the following steps: Step S10: Periodically check the flame size of the combustion device when it is in the pilot flame state. When the flame size of the combustion device is lower than the set value, turn off the pilot flame of the combustion device. Step S20: The transport vehicle carries the empty molten iron ladle to a position directly below the burner of the combustion device; Step S30: Introduce cleaning fluid into the gas supply pipe of the combustion device, soaking time T1; Step S40: Input compressed air into the air supply pipe, pressurization time T2; Step S50: Open the valve at the outlet end of the gas pipeline to allow the cleaning fluid in the gas pipeline to be discharged into the molten iron ladle.

6. The cleaning method according to claim 5, characterized in that, Time T1 ≥ 20 minutes, and / or, time T2 ≥ 5 minutes.

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