Catalytic device waste heat recovery main fan energy-saving system

Abstract

The invention belongs to the technical field of waste heat recycling and energy saving of catalytic cracking devices, particularly relates to a waste heat recycling main fan energy-saving system of a catalytic device, and aims to solve the problems that most existing devices are provided with electric heating devices to increase the temperature of an inlet of a main fan to prevent frosting, but the air volume is too large, the equipment is too small or the power is not enough, and the anti-frosting effect is poor. In order to solve the problems, the invention provides the following scheme: the device comprises a main fan; the silencer is fixedly connected with one side of the main fan, and the silencer is connected with a filter cloth outlet valve; according to the air cooling device, air heated at the air cooling outlet can be recycled, the air can be led to the inlet of the main fan, waste heat is recycled, energy is saved, emission is reduced, meanwhile, the temperature of the inlet of the main fan is increased to be higher than 0 DEG C, the problem that a filter screen and a silencer at the inlet of the main fan frost in winter is solved, and the air cooling device has the advantages of being energy-saving, environment-friendly, energy-saving and environment-friendly. And the process is simple in design, convenient to operate and flexible to control.

Description

Technical Field

[0001] The present invention relates to the technical field of waste heat recovery and energy saving of a catalytic cracking unit, and in particular to an energy-saving system for a main fan of a catalytic unit for recovering waste heat. Background Art

[0002] At present, there are about 6 groups of air cooling in the distillation station of the catalytic cracking unit. The air after heat exchange is directly discharged into the atmosphere without recovering this part of the heat. In today's era, carbon peak has become an important goal that attracts global attention. It is particularly important to abandon the traditional model of high energy consumption and high emissions, adopt energy-saving and environmentally friendly technologies, improve energy utilization efficiency, reduce carbon emissions, and develop new clean energy technologies.

[0003] The catalytic cracking unit has an annual processing capacity of 1-2 million tons, and the main fan delivers 130,000-200,000 cubic meters of air per hour. Most catalytic cracking units are located in northern China, where frost forms in winter. When fog falls or the temperature drops below 0°C, the main fan inlet filter and muffler will frost or even ice up, causing the unit to shut down.

[0004] In the existing technology, many electric heating devices are installed to increase the main fan inlet temperature to prevent frost. However, the air volume is too large, the equipment is too small or the power is insufficient, the anti-frost effect is poor, and the power consumption is also very high. For this reason, we propose a catalytic device waste heat recovery main fan energy-saving system to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to solve the problem in the prior art that many electric heating devices are installed to increase the inlet temperature of the main fan to prevent frost, but the air volume is too large, the equipment is too small or the power is insufficient, the anti-frost effect is poor, and the power consumption is also high. A catalytic device waste heat recovery main fan energy-saving system is proposed.

[0006] The present application provides a catalytic device waste heat recovery main fan energy-saving system that adopts the following technical solutions: A catalytic device waste heat recovery main fan energy-saving system, comprising: Main fan; The silencer is fixedly connected to one side of the main fan and is connected to a filter cloth outlet valve; The main air inlet filter cloth is connected to the main air inlet filter cloth, and the filter cloth inlet valve and negative pressure gauge are connected to the negative pressure gauge and the filter cloth outlet valve; A spray pump, the output port of which is connected to a flushing water pipeline, and the spray pump is connected to a water collection tank; Air cooling inlet gate valve, the air cooling inlet gate valve is connected to the air cooler, the air cooler is connected to the air cooling outlet gate valve and the air cooler outlet thermocouple, the air cooling outlet gate valve is connected to the distillation tower top rich gas cooler, the air cooler outlet thermocouple is connected to the air cooler outlet valve, the air cooler outlet valve is connected to the air cooler outlet vent valve, and the air cooler outlet vent valve is connected to the filter cloth inlet valve.

[0007] Furthermore, a connecting tube is fixedly installed on the top of the main fan, an air inlet pipe and an air delivery pipe are fixedly connected to the outside of the connecting tube, the air delivery pipe is fixedly connected to the heating chamber, and one end of the air inlet pipe is fixedly connected to an air collecting hood.

[0008] Furthermore, the connecting tube and the main fan are rotatably mounted with the same first transmission rod, and the outer side of the worm and one end of the first transmission rod are respectively fixedly mounted with a first bevel gear and a second bevel gear, and the first bevel gear and the second bevel gear are meshed with each other.

[0009] Furthermore, a third bevel gear and a fourth bevel gear are fixedly mounted on the other end of the first transmission rod and one end of the rotating shaft, respectively, and the third bevel gear and the fourth bevel gear are meshed with each other.

[0010] Furthermore, a second transmission rod is rotatably mounted on the bottom of the main fan, a worm gear is fixedly mounted on one end of the second transmission rod, and the worm gear is meshed with the worm.

[0011] Furthermore, a return spring is sleeved on the outer side of the connecting rod, and both ends of the return spring are fixedly connected to the outer side of the connecting plate and the outer side of the fixed block respectively. A cam is fixedly installed on the outer side of the second transmission rod, and the cam cooperates with the connecting rod.

[0012] Furthermore, a blocking block is slidably installed in the exhaust port, a connecting plate is fixedly connected to the outside of the blocking block, a fixed block is fixedly installed on the bottom of the protective cover, the fixed block and the main fan are slidably installed with the same connecting rod, and one end of the connecting rod is fixedly connected to the connecting plate.

[0013] Furthermore, a second support rod is fixedly installed in the connecting cylinder, a rotating shaft is rotatably installed on the second support rod, and a second impeller is fixedly installed on the outer side of the rotating shaft.

[0014] Furthermore, a first support rod is fixedly installed in the main fan, a drive motor is fixedly installed on the first support rod, a worm is rotatably installed on the first support rod, a first impeller is fixedly installed on the outside of the worm, and one end of the worm is fixedly connected to the output shaft of the drive motor.

[0015] Furthermore, an air outlet is provided on one side of the main fan, a protective cover is fixedly installed on the outside of the muffler, a heating chamber is provided in the protective cover, and an air outlet is provided on the inner wall of one side of the heating chamber.

[0016] In summary, this application includes at least one of the following beneficial technical effects: 1. This solution is set up on the air cooling of the fractionation and stabilization positions, recovering the heated air at the air cooling outlet and leading it to the main fan inlet to recover the waste heat. The main fan inlet temperature can be increased by 10-20℃. There are about 10 groups of air cooling at the fractionation and stabilization positions. According to the temperature of the main fan inlet, the appropriate number of groups can be selected and transferred to the main fan inlet, and the rest are discharged to the atmosphere, which does not affect the operation of the air cooling; 2. This solution can regularly flush the air-cooled fins to remove dust deposited on the fins and maintain the heat exchange effect. The water used to flush the air-cooled fins is softened water or low-temperature condensate to prevent scaling on the fins and affect the heat exchange effect. The water used to flush the air-cooled fins can be recycled and reused. The water temperature is naturally cooled by heat exchange with the air during the flushing process, and there is no need to use circulating water for cooling. The water is replaced according to the amount of dust in the water to maintain the cleanliness of the water.

[0017] The present invention can recycle the air heated at the air-cooling outlet and lead it to the main fan inlet to recycle waste heat, thereby saving energy and reducing emissions. At the same time, it increases the main fan inlet temperature to above 0°C, solves the problem of frost on the main fan inlet filter and muffler in winter, and has a simple process design, easy operation and flexible control. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural diagram of a main fan energy-saving system for recovering waste heat from a catalytic device proposed by the present invention; Figure 2 This is a structural schematic diagram of a main fan of a catalytic device waste heat recovery main fan energy-saving system proposed by the present invention; Figure 3 The present invention proposes a catalytic device waste heat recovery main fan energy saving system Figure 2 A schematic diagram of the structure of the enlarged part A; Figure 4 The present invention proposes a catalytic device waste heat recovery main fan energy saving system Figure 2 A schematic diagram of the structure of the enlarged portion B; Figure 5 The present invention proposes a catalytic device waste heat recovery main fan energy saving system Figure 2 Schematic diagram of the enlarged structure of part C.

[0019] Figure 1: 1. air-cooling inlet gate valve; 2. air-cooling outlet gate valve; 3. flushing water pipeline; 4. air cooler; 5. water collection tank; 6. spray pump; 7. air-cooler outlet thermocouple; 8. air-cooler outlet valve; 9. air-cooler outlet vent valve; 10. filter cloth inlet valve; 11. main air inlet filter cloth; 12. negative pressure gauge; 13. filter cloth outlet valve; 14. silencer; 15. main fan; 16. fractionation tower top rich gas cooler; 17. first support rod; 18. drive motor; 19. worm; 20. first impeller ; 21. Protective cover; 22. Heating chamber; 23. Exhaust port; 24. Air supply pipe; 25. Air inlet pipe; 26. Air collecting hood; 27. Connecting tube; 28. First bevel gear; 29. ​​Second bevel gear; 30. First transmission rod; 31. Third bevel gear; 32. Fourth bevel gear; 33. Second support rod; 34. Rotating shaft; 35. Second impeller; 36. Worm gear; 37. Second transmission rod; 38. Cam; 39. Connecting rod; 40. Fixed block; 41. Return spring; 42. Connecting plate; 43. Blocking block. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Example 1

[0021] Reference Figure 1 , a catalytic device waste heat recovery main fan energy-saving system, comprising: Main fan 15; The muffler 14 is fixedly connected to one side of the main fan 15, and the filter cloth outlet valve 13 is connected to the muffler 14; The main air inlet filter cloth 11 is connected to the main air inlet filter cloth 11, and the filter cloth inlet valve 10 and the negative pressure gauge 12 are connected to the filter cloth outlet valve 13; A spray pump 6, the output port of which is connected to a flushing water pipeline 3, and the spray pump 6 is connected to a water collecting tank 5; Air cooling inlet gate valve 1, the air cooling inlet gate valve 1 is connected to the air cooler 4, the air cooler 4 is connected to the air cooling outlet gate valve 2 and the air cooler outlet thermocouple 7, the air cooling outlet gate valve 2 is connected to the distillation tower top rich gas cooler 16, the air cooler outlet thermocouple 7 is connected to the air cooler outlet valve 8, the air cooler outlet valve 8 is connected to the air cooler outlet vent valve 9, and the air cooler outlet vent valve 9 is connected to the filter cloth inlet valve 10.

[0022] Reference Figure 2-Figure 5, a connecting cylinder 27 is fixedly installed on the top of the main fan 15, and the outside of the connecting cylinder 27 is fixedly connected with the air inlet pipe 25 and the air delivery pipe 24, the air delivery pipe 24 is fixedly connected to the heating chamber 22, and one end of the air inlet pipe 25 is fixedly connected to the air collecting cover 26, and the connecting cylinder 27 and the main fan 15 are rotatably mounted with the same first transmission rod 30, and the outside of the worm 19 and one end of the first transmission rod 30 are respectively fixedly mounted with a first bevel gear 28 and a second bevel gear 29, and the first bevel gear 28 and the second bevel gear 29 are meshed, and the first transmission The other end of the moving rod 30 and one end of the rotating shaft 34 are respectively fixedly mounted with a third bevel gear 31 and a fourth bevel gear 32, the third bevel gear 31 and the fourth bevel gear 32 are meshed, and the bottom of the main fan 15 is rotatably mounted with a second transmission rod 37, one end of the second transmission rod 37 is fixedly mounted with a worm gear 36, the worm gear 36 is meshed with the worm 19, and the outer side of the connecting rod 39 is sleeved with a return spring 41, and the two ends of the return spring 41 are respectively fixedly connected to the outer side of the connecting plate 42 and the outer side of the fixed block 40, and the second transmission rod 37 is rotatably mounted. The outside of the cam 38 is fixedly installed, the cam 38 cooperates with the connecting rod 39, a block 43 is slidably installed in the exhaust port 23, the outside of the block 43 is fixedly connected to the connecting plate 42, the bottom of the protective cover 21 is fixedly installed with a fixed block 40, the fixed block 40 and the main fan 15 are slidably installed with the same connecting rod 39, one end of the connecting rod 39 is fixedly connected to the connecting plate 42, a second support rod 33 is fixedly installed in the connecting tube 27, a rotating shaft 34 is rotatably installed on the second support rod 33, and the outside of the rotating shaft 34 is fixedly installed There is a second impeller 35, a first support rod 17 is fixedly installed in the main fan 15, a drive motor 18 is fixedly installed on the first support rod 17, a worm 19 is rotatably installed on the first support rod 17, a first impeller 20 is fixedly installed on the outside of the worm 19, one end of the worm 19 is fixedly connected to the output shaft of the drive motor 18, an air outlet is provided on one side of the main fan 15, a protective cover 21 is fixedly installed on the outside of the muffler 14, a heating chamber 22 is provided in the protective cover 21, and an exhaust port 23 is provided on the inner wall of one side of the heating chamber 22.

[0023] The working principle of this embodiment is as follows: the air heated by the air cooling system of the fractionation station after heat exchange (the air cooler system can also be installed if the stabilization station is equipped with one) passes through the air cooler outlet thermocouple 7, the air cooler outlet valve 8 is opened, the air cooler outlet vent valve 9 is closed, and the air passes through the filter cloth inlet valve 10, the main air inlet filter cloth 11 for filtration, the negative pressure gauge 12, and the baffle after the filter cloth outlet valve 13 in sequence. All the air-cooled and heated air is collected and then passes through the muffler 14 at the inlet of the main fan 15 and enters the main fan 15. According to the level of atmospheric temperature and the level of the inlet temperature of the main fan 15, by controlling the number of air cooler outlet valves 8 in use at each group of air cooling outlets, the inlet temperature of the main fan 15 can be increased by 10- 20℃, especially in winter, basically all of it is put into use, and at the same time, the circulating water consumption of the rich gas at the top of the distillation tower through the rich gas cooler 16 at the top of the distillation tower is reduced. The heat exchange effect of the air cooler 4 is judged according to the temperature of the thermocouple 7 at the outlet of each group of air coolers. If the temperature is too low, softened water or low-temperature condensate water is put into use through the flushing water pipeline 3 to flush and clean the air-cooled fins. The water for flushing the air-cooled fins passes through the air cooler 4 and is recovered to the water collection tank 5. It is then recycled to the flushing water pipeline 3 through the spray pump 6. The flushing water passes through the air cooler 4 and naturally cools down in the process of falling into the water collection tank 5. It is replaced according to the amount of dust in the water to maintain the cleanliness of the water and prevent dust from accumulating on the fins. According to the data of the negative pressure meter 12 , when the data is too large, it is necessary to replace the main air inlet filter cloth 11, open the air cooler outlet valve 8, open the air cooler outlet vent valve 9, close the filter cloth inlet valve 10, and discharge the heated air after heat exchange in the air cooling system to the atmosphere. The filter cloth outlet valve 13 is closed, and the main air inlet filter cloth 11 is cut out and replaced. When the main fan 15 is running, the drive motor 18 drives the worm 19 to rotate, the worm 19 drives the first bevel gear 28 to rotate, the first bevel gear 28 drives the second bevel gear 29 to rotate, the second bevel gear 29 drives the first transmission rod 30 to rotate, the first transmission rod 30 drives the third bevel gear 31 to rotate, and the third bevel gear 31 drives the fourth The bevel gear 32 rotates, and the fourth bevel gear 32 drives the rotating shaft 34 to rotate, and the rotating shaft 34 drives the second impeller 35 to rotate. The suction force generated by the rotation of the second impeller 35 discharges the residual heat into the heating chamber 22 through the air collecting hood 26, the air inlet pipe 25 and the air delivery pipe 24, thereby making the internal temperature of the protective cover 21 uniform, and making the muffler 14 evenly heated, thereby improving the anti-frost effect. At the same time, the worm 19 drives the worm wheel 36 to rotate, and the worm wheel 36 drives the second transmission rod 37 to rotate, and the second transmission rod 37 drives the cam 38 to rotate, and the cam 38 drives the connecting rod 39 to move horizontally, and the connecting plate 42 drives the block 43 to reciprocate and open and close the exhaust port 23, thereby allowing the preheating to fully stop for heat exchange. Example 2

[0024] The difference between this embodiment and the first embodiment is that: a plurality of electric heating wires are fixedly installed inside the gas pipe 24, a controller is fixedly installed on the connecting tube 27, a temperature sensor is installed on the muffler 14, and the temperature sensor, the controller and the electric heating wire are connected. The temperature sensor can monitor the temperature of the muffler 14. When the temperature is lower than the set threshold, the temperature sensor sends an instruction to the controller, and the controller controls the electric heating wire to start and perform temperature compensation.

[0025] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A catalytic device waste heat recovery main fan energy-saving system, characterized by: include: Main fan (15); A muffler (14), the muffler (14) is fixedly connected to one side of the main fan (15), and a filter cloth outlet valve (13) is connected to the muffler (14); A main air inlet filter cloth (11) is connected to the main air inlet filter cloth (11), a filter cloth inlet valve (10) and a negative pressure gauge (12), and the negative pressure gauge (12) is connected to the filter cloth outlet valve (13); A spray pump (6), the output port of the spray pump (6) is connected to a flushing water pipeline (3), and the spray pump (6) is connected to a water collecting tank (5); An air cooling inlet gate valve (1) is connected to an air cooler (4), an air cooling outlet gate valve (2) and an air cooler outlet thermocouple (7) are connected to the air cooler (4), the air cooling outlet gate valve (2) is connected to a fractionation tower top rich gas cooler (16), the air cooler outlet thermocouple (7) is connected to an air cooler outlet valve (8), the air cooler outlet valve (8) is connected to an air cooler outlet vent valve (9), and the air cooler outlet vent valve (9) is connected to a filter cloth inlet valve (10).

2. The energy-saving system for the main fan of a catalytic device for waste heat recovery according to claim 1 is characterized in that: An air outlet is provided on one side of the main fan (15), a protective cover (21) is fixedly mounted on the outside of the muffler (14), a heating chamber (22) is provided in the protective cover (21), and an air outlet (23) is provided on the inner wall of one side of the heating chamber (22).

3. The energy-saving system for the main fan of a catalytic device for waste heat recovery according to claim 2 is characterized in that: A connecting tube (27) is fixedly installed on the top of the main fan (15), and an air inlet pipe (25) and an air delivery pipe (24) are fixedly connected to the outside of the connecting tube (27). The air delivery pipe (24) is fixedly connected to the heating chamber (22), and one end of the air inlet pipe (25) is fixedly connected to an air collecting hood (26).

4. The energy-saving system for the main fan of a catalytic device for waste heat recovery according to claim 3 is characterized in that: A first support rod (17) is fixedly mounted in the main fan (15), a drive motor (18) is fixedly mounted on the first support rod (17), a worm (19) is rotatably mounted on the first support rod (17), a first impeller (20) is fixedly mounted on the outer side of the worm (19), and one end of the worm (19) is fixedly connected to the output shaft of the drive motor (18).

5. The energy-saving system for the main fan of a catalytic device for waste heat recovery according to claim 4 is characterized in that: The connecting tube (27) and the main fan (15) are rotatably mounted with a first transmission rod (30), and a first bevel gear (28) and a second bevel gear (29) are fixedly mounted on the outer side of the worm (19) and one end of the first transmission rod (30), respectively, and the first bevel gear (28) and the second bevel gear (29) are meshed with each other.

6. The energy-saving system for the main fan of a catalytic device for waste heat recovery according to claim 5 is characterized in that: A second support rod (33) is fixedly mounted in the connecting cylinder (27), a rotating shaft (34) is rotatably mounted on the second support rod (33), and a second impeller (35) is fixedly mounted on the outer side of the rotating shaft (34).

7. The energy-saving system for the main fan of a catalytic device for waste heat recovery according to claim 6 is characterized in that: A third bevel gear (31) and a fourth bevel gear (32) are fixedly mounted on the other end of the first transmission rod (30) and one end of the rotating shaft (34), respectively. The third bevel gear (31) and the fourth bevel gear (32) are meshed with each other.

8. The energy-saving system for the main fan of a catalytic device for waste heat recovery according to claim 7 is characterized in that: A blocking block (43) is slidably mounted in the exhaust port (23), a connecting plate (42) is fixedly connected to the outer side of the blocking block (43), a fixing block (40) is fixedly mounted on the bottom of the protective cover (21), and a connecting rod (39) is slidably mounted on the fixing block (40) and the main fan (15), and one end of the connecting rod (39) is fixedly connected to the connecting plate (42).

9. The energy-saving system for the main fan of a catalytic device for waste heat recovery according to claim 8, characterized in that: A second transmission rod (37) is rotatably mounted on the bottom of the main fan (15), and a worm gear (36) is fixedly mounted on one end of the second transmission rod (37), and the worm gear (36) is meshed with the worm (19).

10. The energy-saving system for the main fan of a catalytic device for waste heat recovery according to claim 9, characterized in that: A return spring (41) is sleeved on the outer side of the connecting rod (39), and the two ends of the return spring (41) are fixedly connected to the outer side of the connecting plate (42) and the outer side of the fixing block (40), respectively. A cam (38) is fixedly installed on the outer side of the second transmission rod (37), and the cam (38) cooperates with the connecting rod (39).

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