Toluene tower heat recovery device for crude benzene hydrogenation process

Abstract

The utility model discloses a toluene tower heat recovery device for a crude benzene hydrogenation process, which comprises a rack, a recovery box is arranged in the rack, a liquid injection port is arranged at the center of the top of the recovery box, the top end of the liquid injection port extends to the outside of the rack, and a circulation tank is arranged on the outer wall of the rack on one side of the recovery box. Air injection pipe openings are formed in the two sides of the top end of the circulation tank, valve pipes are installed at the ends, away from the circulation tank, of the air injection pipe openings, a shaft seat is arranged on the outer wall of one side of each valve pipe, a piece containing frame is arranged on the outer wall of the portion, above the shaft seat, of each valve pipe, a telescopic driving piece is rotationally installed at the top of each piece containing frame, and a driving arm is rotationally installed at the bottom end of each telescopic driving piece. A rotating shaft is rotationally installed in the valve pipe, and one end of the rotating shaft penetrates through the shaft seat and is connected with one end of the driving arm. The use convenience of the heat recovery device is improved, the recovery effect of heat energy in high-temperature flue gas exhausted by the toluene tower is guaranteed when the heat recovery device is used, and the environmental protection property of the heat recovery device is improved when the heat recovery device is used.

Description

Technical Field

[0001] The utility model relates to the technical field of heat recovery, in particular to a toluene tower heat recovery device in a crude benzene hydrogenation process. Background Art

[0002] In the crude benzene hydrogenation process, the toluene tower is a key equipment for separating and purifying toluene. However, the toluene tower generates a large amount of high-temperature steam and waste heat during operation. If this heat is directly discharged into the environment, it will not only cause energy waste but also cause thermal pollution to the environment. Therefore, the development of an efficient and reliable toluene tower heat recovery device is of great significance to improving the economy and environmental protection of the entire process.

[0003] Reference announcement number CN217887024U is a distillation tower heat recovery device, which includes a distillation tower body and a shell, the inner cavity of the shell is fixedly connected to a heat exchange pipe, the top of the distillation tower body is connected to an air inlet pipe whose bottom penetrates the inner cavity of the shell and is connected to the top of the heat exchange pipe, the air inlet pipe is fixedly connected to a pressure gauge, and the outer surface of the heat exchange pipe is provided with a mounting groove. When the distillation tower heat recovery device is in use, the gas phase of the distillation tower enters the heat exchange pipe from the air inlet pipe, and the heat is transferred to the circulation pipe through the outer wall of the heat exchange pipe, and the heat is recovered by the flow of circulating water in the circulation pipe. Heat is collected, and the setting of the installation groove makes the contact area between the heat exchange tube and the circulation tube larger, making the heat transfer efficiency higher. The pressure of the air inlet pipe is monitored by a pressure gauge. When the pressure is too high, the pressure is shared by the pressure relief component to reduce the possibility of structural damage. The overall structure realizes the purpose of the distillation tower heat recovery device with high heat exchange efficiency. According to the above, although the device can be well applied, it is usually not convenient for dual-channel injection of the injected high-temperature flue gas, and it is difficult to adjust the injection rate of the high-temperature flue gas. There are certain inconveniences in use and it needs to be improved. Summary of the Invention

[0004] The purpose of the utility model is to provide a toluene tower heat recovery device for a crude benzene hydrogenation process, so as to solve the problem that although the device proposed in the above background technology can be well applied, it is usually not convenient to perform dual-channel injection of the injected high-temperature flue gas, and it is difficult to adjust the injection rate of the high-temperature flue gas, which causes certain inconveniences during use.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a heat recovery device for a toluene tower in a crude benzene hydrogenation process, comprising a frame, a recovery box is provided inside the frame, a liquid injection port is provided at the center position of the top of the recovery box, the top of the liquid injection port extends to the outside of the frame, a circulation tank is provided on the outer wall of the frame on one side of the recovery box, gas injection pipe ports are provided on both sides of the top of the circulation tank, a valve pipe is installed at one end of the gas injection pipe port away from the circulation tank, an axle seat is provided on the outer wall of one side of the valve pipe, a component rack is provided on the outer wall of the valve pipe above the axle seat, a telescopic driving member is rotatably installed on the top of the component rack, a driving arm is rotatably installed on the bottom end of the telescopic driving member, a rotating shaft is rotatably installed inside the valve pipe, one end of the rotating shaft passes through the axle seat and is connected to one end of the driving arm.

[0006] Preferably, the outer wall of the circulation tank away from the recovery box is provided with equally spaced air intake pipes, and the ends of the air intake pipes away from the circulation tank extend to the interior of the recovery box and are provided with heat exchange pipes. The heat exchange pipes are arranged to recover the heat energy in the high-temperature flue gas through heat exchange.

[0007] Preferably, a purification box is provided on the outer wall of the recovery box away from the circulation tank, and an exhaust pipe is provided on the end of the heat exchange tube away from the air inlet pipe. The end of the exhaust pipe away from the heat exchange tube extends to the interior of the purification box. The purification box is set up to facilitate the placement and treatment of the filter.

[0008] Preferably, an upper flange is fixed on the outer wall of the upper end of the valve tube, and a lower flange is fixed on the outer wall of the lower end of the valve tube. The upper flange is provided so that the exhaust pipe of the external toluene tower can be connected to the valve tube.

[0009] Preferably, a filter is installed inside the purification box, and an exhaust port is provided on the outer wall of the purification box away from the exhaust pipe. The filter is provided to filter and purify the high-temperature flue gas.

[0010] Preferably, a connecting frame is provided on the outer wall of the rotating shaft, and a valve plate is installed on the outer wall of the connecting frame. The outer wall of the valve plate touches the inner wall of the valve pipe, and the opening and closing size of the valve pipe can be adjusted by setting the valve plate.

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows: the heat recovery device for the toluene tower in the crude benzene hydrogenation process not only improves the convenience of using the heat recovery device, but also ensures the heat recovery effect of the heat recovery device on the high-temperature flue gas discharged from the toluene tower when the heat recovery device is used, and improves the environmental friendliness of the heat recovery device when used;

[0012] The telescopic driving member drives the rotating shaft to rotate through the driving arm, so that the rotating shaft drives the valve plate to rotate through the connecting frame, so that the opening and closing size of the valve pipe can be adjusted to adjust the injection rate of the high-temperature flue gas discharged from the toluene tower as needed. Since there are two valve pipes, the high-temperature flue gas can be injected into the dual channels, thereby improving the convenience of using the heat recovery device;

[0013] High-temperature flue gas is injected into the circulation tank through the gas injection pipe port, so that this part of the high-temperature flue gas flows into multiple heat exchange tubes through multiple air inlet pipes. The high-temperature flue gas circulates inside the heat exchange tubes and is discharged through the exhaust pipe. In this process, the heat energy in the high-temperature flue gas inside the heat exchange tubes will exchange heat with the water source injected into the recovery box. Due to the arrangement of multiple heat exchange tubes and the arrangement of the heat exchange tubes in a serpentine structure, the contact heat exchange area between the high-temperature flue gas and the water source is increased, thereby ensuring the heat recovery effect of the high-temperature flue gas discharged from the toluene tower when the heat recovery device is used;

[0014] By setting up the exhaust duct, the flue gas after heat exchange recovery inside the heat exchange tube flows into the purification box. At this time, the filter screen filters and purifies the flue gas, and the purified gas is discharged from the exhaust port, which can reduce the pollution caused by direct discharge of flue gas into the air, thereby improving the environmental friendliness of the heat recovery device when in use. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the three-dimensional structure of the utility model;

[0016] Figure 2 This is a schematic diagram of the front cross-sectional structure of the utility model;

[0017] Figure 3 For this utility model Figure 1 A in the middle is an enlarged structural diagram;

[0018] Figure 4 For this utility model Figure 2 Enlarged structural diagram at point B in the middle.

[0019] In the figure: 1. Frame; 2. Recovery box; 3. Circulation tank; 4. Air inlet pipe; 5. Air injection pipe port; 6. Valve pipe; 601. Upper flange; 602. Lower flange; 7. Liquid injection port; 8. Purification box; 9. Heat exchange tube; 10. Exhaust pipe; 11. Component rack; 12. Telescopic drive component; 13. Drive arm; 14. Shaft seat; 15. Rotating shaft; 16. Connecting frame; 17. Valve plate; 18. Filter; 19. Exhaust port. DETAILED DESCRIPTION

[0020] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0021] See also Figure 1-4 The present invention provides an embodiment of a toluene tower heat recovery device for a crude benzene hydrogenation process, comprising a frame 1, a recovery box 2 being provided inside the frame 1, a liquid injection port 7 being provided at the center of the top of the recovery box 2, the top of the liquid injection port 7 extending to the outside of the frame 1, a circulation tank 3 being provided on the outer wall of the frame 1 on one side of the recovery box 2, an air intake pipe 4 being provided at equal intervals on the outer wall of the circulation tank 3 away from the recovery box 2, the end of the air intake pipe 4 away from the circulation tank 3 extending to the interior of the recovery box 2 and provided with a heat exchange pipe 9;

[0022] When in use, the heat exchange tube 9 is provided to recover the heat energy in the high-temperature flue gas;

[0023] A purification box 8 is provided on the outer wall of the recovery box 2 away from the circulation tank 3. An exhaust pipe 10 is provided on the end of the heat exchange pipe 9 away from the air inlet pipe 4. The end of the exhaust pipe 10 away from the heat exchange pipe 9 extends to the interior of the purification box 8.

[0024] When in use, the purification box 8 is provided so as to place and process the filter 18;

[0025] A filter screen 18 is installed inside the purification box 8, and an exhaust port 19 is provided on the outer wall of the purification box 8 away from the exhaust pipe 10;

[0026] When in use, the filter 18 is provided to filter and purify the high-temperature flue gas;

[0027] Gas injection nozzles 5 are provided on both sides of the top of the circulation tank 3. A valve tube 6 is installed at the end of the gas injection nozzle 5 away from the circulation tank 3. An upper flange 601 is fixed to the outer wall of the upper end of the valve tube 6, and a lower flange 602 is fixed to the outer wall of the lower end of the valve tube 6.

[0028] When in use, the upper flange 601 is provided so as to connect the exhaust pipe of the external toluene tower to the valve pipe 6;

[0029] A shaft seat 14 is provided on the outer wall of one side of the valve tube 6. A mounting bracket 11 is provided on the outer wall of the valve tube 6 above the shaft seat 14. A telescopic driving member 12 is rotatably mounted on the top of the mounting bracket 11. A driving arm 13 is rotatably mounted on the bottom end of the telescopic driving member 12. A rotating shaft 15 is rotatably mounted inside the valve tube 6. One end of the rotating shaft 15 passes through the shaft seat 14 and is connected to one end of the driving arm 13. A connecting bracket 16 is provided on the outer wall of the rotating shaft 15. A valve plate 17 is mounted on the outer wall of the connecting bracket 16. The outer wall of the valve plate 17 contacts the inner wall of the valve tube 6.

[0030] During use, the valve plate 17 is arranged to adjust the opening and closing size of the valve tube 6 .

[0031] When the embodiment of the present application is in use, first, a normal temperature water source is injected into the recovery box 2 through the liquid injection port 7, and the upper flange 601 at the top of the valve tube 6 is connected to the flue gas exhaust pipe of the toluene tower. At this time, the high temperature flue gas is injected into the circulation tank 3 through the gas injection port 5, so that this part of the high temperature flue gas flows into the multiple heat exchange tubes 9 through multiple air inlet pipes 4. The high temperature flue gas circulates inside the heat exchange tubes 9 and is discharged through the exhaust pipe 10. In this process, the heat energy in the high temperature flue gas inside the heat exchange tubes 9 will be exchanged with the water source injected into the recovery box 2. Due to the arrangement of multiple heat exchange tubes 9 and the arrangement of the heat exchange tubes 9 in a serpentine structure to increase the contact heat exchange area between the high temperature flue gas and the water source, it can be ensured that the toluene is heated. The heat energy recovery effect in the high-temperature flue gas discharged from the benzene tower is achieved. Then, through the setting of the exhaust pipe 10, the flue gas after heat exchange recovery in the heat exchange tube 9 flows into the purification box 8. At this time, the filter 18 filters and purifies the flue gas, and the purified gas is discharged from the exhaust port 19, which can reduce the phenomenon of direct discharge of flue gas into the air and causing pollution. Finally, the rotating shaft 15 is driven to rotate through the driving arm 13 by the telescopic driving member 12, so that the rotating shaft 15 drives the valve plate 17 to rotate through the connecting frame 16, and the opening and closing size of the valve pipe 6 can be adjusted to adjust the injection rate of the high-temperature flue gas as needed. Because there are two valve pipes 6, the high-temperature flue gas can be injected into the dual channel, thereby completing the use of the heat recovery device.

Claims

1. A toluene tower heat recovery device for a crude benzene hydrogenation process, characterized in that: The invention comprises a frame (1), wherein a recycling box (2) is provided inside the frame (1), a liquid injection port (7) is provided at the center position of the top of the recycling box (2), the top of the liquid injection port (7) extends to the outside of the frame (1), a circulation tank (3) is provided on the outer wall of the frame (1) on one side of the recycling box (2), and gas injection ports (5) are provided on both sides of the top of the circulation tank (3), a valve tube (6) is installed at one end of the gas injection port (5) away from the circulation tank (3), an axle seat (14) is provided on the outer wall of one side of the valve tube (6), a component rack (11) is provided on the outer wall of the valve tube (6) above the axle seat (14), a telescopic driving member (12) is rotatably installed on the top of the component rack (11), a driving arm (13) is rotatably installed on the bottom end of the telescopic driving member (12), a rotating shaft (15) is rotatably installed inside the valve tube (6), and one end of the rotating shaft (15) passes through the axle seat (14) and is connected to one end of the driving arm (13).

2. A toluene tower heat recovery device for a crude benzene hydrogenation process according to claim 1, characterized in that: An outer wall of the circulation tank (3) away from the recovery box (2) is provided with air intake pipes (4) at equal intervals. One end of the air intake pipe (4) away from the circulation tank (3) extends to the interior of the recovery box (2) and is provided with a heat exchange pipe (9).

3. A toluene tower heat recovery device for a crude benzene hydrogenation process according to claim 2, characterized in that: A purification box (8) is provided on the outer wall of the recovery box (2) away from the circulation tank (3), and an exhaust pipe (10) is provided on the end of the heat exchange tube (9) away from the air inlet pipe (4). The end of the exhaust pipe (10) away from the heat exchange tube (9) extends to the interior of the purification box (8).

4. A toluene tower heat recovery device for a crude benzene hydrogenation process according to claim 1, characterized in that: An upper flange (601) is fixed on the outer wall of the upper end of the valve tube (6), and a lower flange (602) is fixed on the outer wall of the lower end of the valve tube (6).

5. A toluene tower heat recovery device for a crude benzene hydrogenation process according to claim 3, characterized in that: A filter screen (18) is installed inside the purification box (8), and an exhaust port (19) is provided on the outer wall of the purification box (8) on the side away from the exhaust pipe (10).

6. A toluene tower heat recovery device for a crude benzene hydrogenation process according to claim 1, characterized in that: A connecting frame (16) is provided on the outer wall of the rotating shaft (15), a valve plate (17) is mounted on the outer wall of the connecting frame (16), and the outer wall of the valve plate (17) contacts the inner wall of the valve tube (6).

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