Dry indirect water cooling and tar removal device

Abstract

A dry indirect water-cooled tar removal device is characterized by comprising two sets of tar removal towers and a tar tank. Each set of tar removal towers consists of multiple towers arranged sequentially. Each tower includes a cylindrical body. Within the cylindrical body, two partition plates form a dispersion chamber, a heat exchange chamber, and a separation chamber arranged vertically. An air inlet is fixedly inserted at the center of the upper end of the cylindrical body for connecting an external air inlet pipe to the furnace gas from the submerged arc furnace and dispersing it into the dispersion chamber. Several heat exchange tubes are installed within the heat exchange chamber, connecting the dispersion chamber and the separation chamber. A circulating water outlet and a circulating water supply are respectively located at the upper and lower ends of the heat exchange chamber. An exhaust port is located on one side of the cylindrical body, corresponding to the upper part of the separation chamber, and connected to an exhaust branch pipe. Each exhaust branch pipe is connected to a main exhaust pipe for discharging the furnace gas. A drain pipe is connected at the center of the lower end of the cylindrical body, and the drain pipe is connected to the tar tank via a main tar pipe. This device has a compact structure, avoids the generation of large amounts of wastewater, and provides good cooling and tar removal effects.

Description

Technical Field

[0001] This utility model relates to furnace gas treatment devices for submerged arc furnaces, and specifically to a dry indirect water cooling and tar removal device. Background Technology

[0002] Currently, domestic submerged arc furnace gas after-treatment facilities employ atomized cooling, primarily consisting of a water tank, wastewater pool, water pumps, oil-water pumps, and atomized cooling tower. The furnace gas, a byproduct of the submerged arc furnace, enters from the top of the atomized cooling tower. Water from the water tank is pressurized by the oil-water pump and fed into the atomized cooling tower from the side. The water is then atomized through nozzles, ensuring thorough contact with the furnace gas within the tower, thus cooling the gas. The cooled gas then flows downstream from the bottom side of the atomized cooling tower. Tar-containing wastewater, by gravity, enters the bottom of the atomized cooling tower and is then drawn into the wastewater pool by the oil-water pump. In the wastewater pool, tar and water are separated, and the separated water is pumped back into the wastewater cooling tower. After multiple cycles, the oily wastewater in the wastewater pool becomes unusable and must be discharged to a designated area. However, dust and tar will enter the water, resulting in a large amount of untreated, unrecyclable wastewater. The tar is also unusable, leading to poor economic and environmental performance and safety concerns. Furthermore, tar is highly viscous, easily clogging pipes and difficult to clean. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a dry indirect water-cooled cooling and tar removal device that has a compact structure, avoids generating a large amount of wastewater, and has good cooling and tar removal effects.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A dry indirect water-cooled tar removal device includes two sets of cooling and tar removal towers and a tar tank. Each set of cooling and tar removal towers consists of multiple towers arranged in sequence. Each cooling and tar removal tower includes a cylinder. Inside the cylinder, two partition plates form a dispersion chamber, a heat exchange chamber, and a separation chamber arranged vertically. An air inlet is fixedly inserted at the center of the upper end of the cylinder for connecting an external air inlet pipe to the furnace gas of the electric arc furnace and dispersing it into the dispersion chamber. Several heat exchange tubes are provided in the heat exchange chamber. The dispersion chamber and the separation chamber are connected through the heat exchange tubes. A circulating water outlet and a circulating water supply are provided at the upper and lower ends of the heat exchange chamber, respectively, to allow circulating water to enter the heat exchange chamber to cool the furnace gas entering the heat exchange tubes. An exhaust port is provided on one side of the cylinder corresponding to the upper part of the separation chamber and connected to an exhaust branch pipe. The exhaust branch pipe is connected to an exhaust main pipe to discharge the furnace gas separated in the separation chamber. A drain pipe is connected at the center of the lower end of the cylinder. The drain pipe is connected to the tar tank through the tar main pipe, so that the liquid tar separated in the separation chamber can flow by gravity to the tar tank.

[0005] As a further preferred option, each group of cooling and decoking towers consists of three arranged in sequence, and the volume of the separation chamber is much larger than the volume of the dispersion chamber.

[0006] As a further preferred option, multiple rectangular holes are evenly distributed along the circumference of the lower outer edge of the air inlet nozzle inside the cylinder, and several through holes are provided at the bottom of the air inlet nozzle to evenly disperse the furnace gas in the dispersion chamber, thereby improving the heat exchange effect.

[0007] As a further preferred option, electric valves are installed on the air inlet pipes, and a vent pipe is connected to the air inlet pipe between the electric valves and the air inlet nozzle. A vent valve is installed at the outer end of the vent pipe. A nitrogen inlet is provided on the other side of the cylinder corresponding to the lower part of the separation chamber and connected to a nitrogen inlet pipe. A nitrogen valve is provided on the nitrogen inlet pipe for introducing nitrogen before cleaning the cooling and decoking tower to purge the furnace gas inside the cylinder.

[0008] As a further preferred embodiment, an inlet is provided on one side of the cylinder corresponding to the middle of the dispersion chamber and connected to a cleaning agent branch pipe. The device is also provided with a cleaning agent tank, and the outlet of the cleaning agent tank is connected to each cleaning agent branch pipe through a circulation pump and pipeline, for pumping in cleaning agent to clean the cooling and decoking tower.

[0009] As a further preferred option, a pressure transmitter is installed on the inlet pipe near the inlet nozzle to detect the inlet pressure of the cooling and decoking tower; a pressure transmitter and a temperature transmitter are installed sequentially on the exhaust branch pipe near the exhaust port to detect the pressure and temperature at the exhaust port.

[0010] As a further preferred embodiment, the drain pipe is connected to the main tar pipe through a tar branch pipe, and an electric valve is provided on the tar branch pipe.

[0011] As a further preferred option, a return branch pipe is connected to the drain pipe, and the return branch pipe is connected to a return main pipe and connected to the cleaning agent tank through the return main pipe, so as to realize the recycling of the cleaning agent.

[0012] The beneficial effects of this utility model are as follows: The furnace gas is introduced into the electric arc furnace through an external inlet pipe and dispersed into the dispersion chamber. The furnace gas is then introduced into the separation chamber through a heat exchange pipe connecting the dispersion chamber and the separation chamber. During the flow of the furnace gas, it exchanges heat with the circulating water entering the heat exchange chamber and is cooled. The separation chamber enables gas-liquid separation of the cooled furnace gas. The separated gas is discharged through the exhaust pipe, and the liquid tar flows to the tar tank through the tar pipe, thus removing tar from the furnace gas. The structure is compact, and the furnace gas does not come into contact with the circulating water, which avoids the generation of a large amount of wastewater. It has good cooling and tar removal effects. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model.

[0014] Figure 2 yes Figure 1 A magnified view of a portion of the image.

[0015] Figure 3 This is a cross-sectional view of the cooling and decoking tower.

[0016] Figure 4 yes Figure 3 A magnified view of the middle air intake.

[0017] Figure 5 yes Figure 4 AA sectional view.

[0018] In the diagram: 1. Cooling and decoking tower; 101. Cylinder; 102. Divider plate; 103. Dispersion chamber; 104. Heat exchange chamber; 105. Separation chamber; 106. Heat exchange tube; 107. Circulating water supply port; 108. Circulating water outlet; 109. Air inlet; 110. Rectangular elongated hole; 111. Through hole; 2. Vent valve; 3. Air inlet pipe; 4. Electric valve; 5. Pressure transmitter; 6. Cleaning electric valve; 7. Cleaning agent branch pipe; 8. Pressure transmitter; 9. Temperature transmitter; 10. Exhaust branch pipe; 11. Return liquid main pipe; 12. Return liquid branch pipe; 13. Electric exhaust valve; 14. Return liquid electric valve; 15. Tar main pipe; 16. Electric valve; 17. Drain pipe; 18. Nitrogen inlet pipe; 19. Circulating pump; 20. Pressure transmitter; 21. Electric reflux valve; 22. Reflux pipe; 23. Cleaning agent tank; 24. Tar tank; 25. Exhaust main pipe; 26. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0020] like Figure 1-5 As shown, this utility model relates to a dry indirect water-cooled tar removal device, which includes two sets of cooling and tar removal towers 1 and a tar tank 25. Each set of cooling and tar removal towers 1 consists of multiple towers arranged sequentially. In this embodiment, three cooling and tar removal towers 1 are used as an example. Each cooling and tar removal tower 1 includes a cylindrical body 101. Inside the cylindrical body 101, two partition plates 102 form a dispersion chamber 103, a heat exchange chamber 104, and a separation chamber 105 that are arranged vertically and isolated from each other. The volume of the separation chamber 105 is much larger than the volume of the dispersion chamber 103.

[0021] An air inlet is provided at the center of the upper end of the cylinder 101 and an air inlet nozzle 109 is fixedly inserted therein, which is used to connect the external air inlet pipe 3 to the furnace gas of the electric arc furnace and disperse it into the dispersion chamber 103; multiple rectangular holes 110 are evenly distributed along the circumference of the lower outer edge of the air inlet nozzle 109 inside the cylinder 101, and several through holes 111 are provided at the bottom of the air inlet nozzle 109, which are used to evenly disperse the furnace gas in the dispersion chamber 103 to improve the heat exchange effect.

[0022] Several heat exchange tubes 106 are arranged vertically inside the heat exchange chamber 104. The two ends of the heat exchange tubes 106 are sealed and fixed to two partition plates 102 inside the cylinder 101. The dispersion chamber 103 and the separation chamber 105 are connected through the heat exchange tubes 106. A circulating water outlet 108 and a circulating water supply 107 are respectively provided on the upper and lower ends of the heat exchange chamber 104 on one side of the cylinder 101 for connecting external circulating water into the heat exchange chamber 104, thereby cooling the furnace gas entering the heat exchange tubes 106.

[0023] On one side of the cylinder 101, corresponding to the upper part of the separation chamber 105, there are exhaust ports and exhaust branch pipes 10 connected to them. The exhaust branch pipes 10 are respectively connected to an exhaust main pipe 26, used to discharge the furnace gas separated in the separation chamber 105 to the downstream gas holder. Electric exhaust valves 13 are respectively installed on the exhaust branch pipes 10 to control the conduction of the exhaust branch pipes 10. Pressure transmitters 8 and temperature transmitters 9 are installed in sequence on the exhaust branch pipes 10 near the exhaust ports to detect the pressure and temperature at the exhaust ports.

[0024] An L-shaped drain pipe 18 is sealed and fixedly connected at the center of the lower end of the cylinder 101. The drain pipe 18 is connected to the tar tank 25 through a tar main pipe 15, allowing the liquid tar separated in the separation chamber 105 to flow by gravity into the tar tank 25. The drain pipe 18 is connected to the tar main pipe 15 through a tar branch pipe 16, and an electric valve 17 is installed on each tar branch pipe 16 to control the discharge of liquid tar.

[0025] The upper end of the air inlet pipe 3 is connected to the main gas pipeline of the electric arc furnace. Electric valves 4 are installed on the air inlet pipe 3. A vent pipe is connected to the air inlet pipe 3 between the electric valves 4 and the air inlet nozzle 109 via a tee. A vent valve 2 is installed at the outer end of the vent pipe. A pressure transmitter 5 is installed on the air inlet pipe 3 near the air inlet nozzle 109 to detect the air inlet pressure of the cooling and decoking tower 1.

[0026] On the other side of the cylinder 101, a nitrogen inlet is provided at the lower part of the separation chamber 105 and connected to a nitrogen inlet pipe 19. A nitrogen valve is provided on the nitrogen inlet pipe 19 to introduce nitrogen before cleaning the cooling and decoking tower 1 to purge the furnace gas inside the cylinder 101.

[0027] An inlet is provided on one side of the cylinder 101 corresponding to the middle of the dispersion chamber 103, and a cleaning agent branch pipe 7 is connected to it. A cleaning electric valve 6 is installed on the cleaning agent branch pipe 7. The device also has a cleaning agent tank 24. The outlet of the cleaning agent tank 24 is connected to each cleaning agent branch pipe 7 through a circulation pump 20 and pipelines, which is used to pump in cleaning agent to clean the cooling and decoking tower 1.

[0028] A return branch pipe 12 is connected to the drain pipe 18. The return branch pipe 12 is connected to a return main pipe 11 and communicates with the inlet on the top surface of the cleaning agent tank 24 through the return main pipe 11 to realize the circulation of the cleaning agent. A return electric valve 14 is installed on the return branch pipe 12 to control the circulation of the cleaning agent.

[0029] A pressure transmitter 21 is installed on the pipeline at the outlet of the circulating pump 20. A return pipe 23 is connected to the pipeline in front of the pressure transmitter 21 via a tee. The return pipe 23 is connected to the inlet on the top surface of the cleaning agent tank 24. An electric return valve 22 is installed on the return pipe 23 to detect whether there is a blockage in the pipeline at the outlet of the circulating pump, thereby controlling whether the electric return valve 22 opens. When the pressure transmitter 21 detects a blockage in the pipeline at the outlet of the circulating pump 20, it sends a signal to the PLC controller in the submerged arc furnace control room and controls the electric return valve 22 to open, preventing pump stalling.

[0030] When in use, the working principle is as follows: 1. Open the electric valve above one set of cooling and coking tower 1, and close the electric valve above the other set of cooling and coking tower 1 as a backup. The furnace gas of the electric arc furnace enters the cooling and coking tower 1 through the air inlet pipe 3 with the electric valve opened, diffuses into the dispersion chamber 103 through the air inlet nozzle 109, and flows downward through the heat exchange tube 106; 2. Circulating water is connected to the heat exchange chamber 104 through the circulating water outlet and circulating water supply outlet, thereby cooling the furnace gas entering the heat exchange tube 106. The cooled furnace gas, carrying liquid tar, enters the lower separation chamber 105 and undergoes gas-liquid separation. The separated furnace gas is discharged to the downstream gas holder through the exhaust pipe 10 and the electric exhaust valve 13. The separated liquid tar is retained in the tar tank 25 through the drain pipe 18, tar branch pipe 16 and tar main pipe 15.

[0031] 3. When the inlet or outlet of the operating cooling and coke removal tower 1 experiences overpressure or high temperature, a signal is sent to the PLC controller in the submerged arc furnace control room via a pressure or temperature transmitter. The PLC controller then controls the electric valve on the inlet pipe 3 to perform a switching operation. At this time, the electric valve on the standby cooling and coke removal tower 1 is opened first, and then the electric valve on the operating cooling and coke removal tower 1 is closed, thus completing the switching operation of the cooling and coke removal tower 1. The switched-out cooling and coke removal tower 1 enters the waiting-for-cleaning state.

[0032] During cleaning, first open the vent valve 2 above the set of cooling and coking towers 1 to be cleaned, then open the nitrogen valve at the bottom to purge the furnace gas inside the cooling and coking towers 1 with nitrogen; then close the vent valve 2 and the nitrogen valve. Prepare the cleaning agent (an organic solvent) in the cleaning agent tank 24. Open the cleaning electric valve 6 and the return electric valve 14 of the cooling and coking tower 1 to be cleaned. The cleaning agent is pressurized by the circulating pump and sent to the top of the cooling and coking tower 1 to be cleaned. The cleaning agent cleans the inside of the cooling and coking tower 1 from top to bottom. After cleaning, the cleaning agent flows back to the cleaning agent tank 24 through the return main pipe 11 and the inlet on the top surface of the cleaning agent tank 24. This cycle continues until the circulating cleaning agent shows no obvious color change, at which point the cooling and coking tower 1 is considered clean. After cleaning, drain the cleaning agent from the tower into the cleaning agent tank 24, then close the cleaning electric valve 6 and the return liquid electric valve 14. The cleaning operation is complete, and the cooling and decoking tower 1 enters standby mode. Used cleaning agent is stored in the cleaning agent tank 24 and replaced periodically.

[0033] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A dry indirect water cooling and decoking device, characterized in that: It includes two sets of cooling and decoking towers and a tar tank. Each set of cooling and decoking towers consists of multiple towers arranged in sequence. Each cooling and decoking tower includes a cylinder. Inside the cylinder, two partition plates form a dispersion chamber, a heat exchange chamber, and a separation chamber arranged vertically. An air inlet is fixedly inserted at the center of the upper end of the cylinder for connecting an external air inlet pipe to the furnace gas of the electric arc furnace and dispersing it into the dispersion chamber. Several heat exchange tubes are provided in the heat exchange chamber. The dispersion chamber and the separation chamber are connected through the heat exchange tubes. A circulating water outlet and a circulating water supply are provided at the upper and lower ends of the heat exchange chamber, respectively, to allow circulating water to enter the heat exchange chamber to cool the furnace gas entering the heat exchange tubes. An exhaust port is provided on one side of the cylinder corresponding to the upper part of the separation chamber and connected to an exhaust branch pipe. The exhaust branch pipe is connected to an exhaust main pipe to discharge the furnace gas separated in the separation chamber. A drain pipe is connected at the center of the lower end of the cylinder. The drain pipe is connected to the tar tank through the tar main pipe, so that the liquid tar separated in the separation chamber can flow by gravity to the tar tank.

2. The dry indirect water cooled quenching and tar decoking device according to claim 1, characterized in that: Each group of cooling and decoking towers consists of three arranged in sequence, and the volume of the separation chamber is much larger than the volume of the dispersion chamber.

3. The dry indirect water cooled quenching and tar removal device of claim 1, wherein The lower outer edge of the air inlet is located inside the cylinder and has multiple rectangular holes evenly distributed along the circumference. Several through holes are provided at the bottom of the air inlet to evenly disperse the furnace gas in the dispersion chamber, thereby improving the heat exchange effect.

4. The dry indirect water cooled quenching and tar decoking device of claim 1, wherein: Electric valves are installed on the air inlet pipes. A vent pipe is connected to the air inlet pipe between the electric valves and the air inlet nozzle. A vent valve is installed at the outer end of the vent pipe. A nitrogen inlet is provided on the other side of the cylinder corresponding to the lower part of the separation chamber and connected to a nitrogen inlet pipe. A nitrogen valve is provided on the nitrogen inlet pipe for introducing nitrogen before cleaning the cooling and decoking tower to purge the furnace gas inside the cylinder.

5. The dry indirect water cooled tar decoking device of claim 1 or 4, wherein The device has an inlet on one side of the cylinder corresponding to the middle of the dispersion chamber and is connected to a cleaning agent branch pipe. The device also has a cleaning agent tank. The outlet of the cleaning agent tank is connected to each cleaning agent branch pipe through a circulation pump and pipeline, which is used to pump in cleaning agent to clean the cooling and decoking tower.

6. The dry indirect water cooled quenching and tar decoking device of claim 1, wherein: A pressure transmitter is installed on the inlet pipe near the inlet nozzle to detect the inlet pressure of the cooling and decoking tower; a pressure transmitter and a temperature transmitter are installed in sequence on the exhaust branch pipe near the exhaust port to detect the pressure and temperature at the exhaust port.

7. The dry indirect water cooled quenching and tar decoking device of claim 1, wherein: The drain pipes are connected to the main tar pipe via tar branch pipes, and electric valves are installed on the tar branch pipes.

8. The dry indirect water cooled quenching and tar removal device of claim 5, wherein Each drain pipe is connected to a return branch pipe, which is connected to a main return pipe and then connected to the cleaning agent tank to enable the recycling of the cleaning agent.

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