Energy-saving and environment-friendly pulse bag-type dust collector

Abstract

The invention belongs to the technical field of dust removal equipment, and particularly relates to an energy-saving and environment-friendly pulse bag-type dust remover which comprises a dust removal shell, the bottom end of the dust removal shell is fixedly sleeved with a star-shaped discharger, the inner wall of the dust removal shell is fixedly connected with a first sealing bearing, and the inner wall of the inner ring of the first sealing bearing is fixedly connected with a bag circular plate. A through hole is formed in the upper surface of the circle center of the cloth bag circular plate, and the hole wall of the through hole is fixedly connected with a rotating shaft. The pulse bag-type dust collector not only has the functions of adaptively adjusting the air suction amount of the suction fan according to the static pressure of the flue gas inlet, on-line continuous pulse dust removal, flue gas waste heat recovery and efficient dioxin removal, but also has the function of automatically adjusting the dust removal frequency, the structure of the dust collector is optimized, the size and the manufacturing cost of the dust collector are reduced, and the service life of the dust collector is prolonged. The use cost of the dust remover is reduced, the use intelligence, reliability, convenience and effect of the dust remover are improved, and the energy-saving and environment-friendly performance of the dust remover is further improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of dust removal equipment, and particularly relates to an energy-saving and environment-friendly pulse bag filter. Background Art

[0002] The pulse bag filter is a commonly used high-efficiency dust removal equipment in industry. It uses fiber filter bags as the core filtering components. After the dust-containing gas enters the dust collector from the inlet, the soot is blocked by the filter bags, and the purified gas is discharged through the outlet. During dust cleaning, the pulse valve is opened, and high-pressure air flows into the filter bags instantaneously, causing the filter bags to expand and contract rapidly, shaking off the attached soot, and achieving continuous and efficient dust removal. For example, the patent with the patent authorization announcement number CN117919852B discloses a pulse bag filter.

[0003] During the production process of steel mills, the flue gas discharged from boilers contains a large amount of soot. If this soot is directly discharged without treatment, it will cause serious environmental pollution. Therefore, the pulse bag filter has become a key equipment for treating such flue gas. However, there are many problems with the pulse bag filters currently used in steel mills; First, the existing pulse bag filters can only perform offline dust cleaning. When dust cleaning, the dust cleaning air chamber needs to be closed, resulting in the input flue gas needing to be directed to other filtering air chambers. This requires an increase in the number of dust removal filter bags 57, thereby increasing the volume of the equipment. In addition, multiple sealed air chambers need to be divided inside the pulse bag filter, and a gate plate and a lift valve need to be installed in each air chamber. This not only significantly increases the cost of the equipment but also increases the loss of the dust removal filter bags, resulting in a significant increase in the use cost; Second, when the existing pulse bag filters treat boiler flue gas, they lack the ability to recover the heat in the flue gas. When filtering soot in a high-temperature environment, it is difficult for dioxins in the flue gas to fully condense with the soot. A large amount of dioxins will pass through the dust removal filter bags, causing secondary pollution. Moreover, the high temperature will enhance the fluidity of micro soot, making it easier to penetrate the dust removal filter bags. This seriously affects the dust removal and purification effect and reliability of the pulse bag filter, and also reduces its energy-saving and environmental protection performance.

[0004] Therefore, we propose an energy-saving and environment-friendly pulse bag filter to solve the above problems. Summary of the Invention

[0005] The object of the present invention is to provide an energy-saving and environment-friendly pulse bag filter for the above problems.

[0006] To achieve the above object, the present invention adopts the following technical solutions: An energy-saving and environment-friendly pulse bag filter, comprising a dust removal housing, a star-shaped discharger is fixedly sleeved at the bottom end of the dust removal housing, a first sealing bearing is fixedly connected to the inner wall of the dust removal housing, a bag circular plate is fixedly connected to the inner wall of the inner ring of the first sealing bearing, a through hole is formed in the upper surface of the center of the bag circular plate, and a rotating shaft is fixedly connected to the hole wall of the through hole, and a dust removal mechanism is fixedly connected to the outer wall of the rotating shaft; A dust cleaning mechanism is fixedly connected to the inner wall of the dust removal housing; The top of the dust removal housing is hermetically connected with a shell cover by bolts, and a driving mechanism for driving the rotating shaft to rotate is fixedly connected to the top end of the shell cover; An exhaust air mechanism is fixedly communicated with the top end of the shell cover; A flue gas waste heat recovery mechanism is fixedly connected to the inner wall of the air inlet of the dust removal housing.

[0007] In the above-mentioned energy-saving and environment-friendly pulse bag filter, the dust removal mechanism includes six partitions evenly fixedly connected to the outer wall of the rotating shaft, the top ends of the partitions are fixedly connected to the lower surface of the bag circular plate, the outer wall of one side of the partition away from the rotating shaft is hermetically slidably connected to the inner wall of the dust removal housing, the six partitions together form six dust removal sectors, and a plurality of filter metal covers are arranged inside each dust removal sector. The top end of the filter metal cover is fixedly connected to the lower surface of the bag circular plate. An installation counterbore is formed in the upper surface of the bag circular plate located at the top of the filter metal cover. A rubber snap ring is movably connected to the hole wall of the installation counterbore. A limiting convex ring is fixedly sleeved on the outer wall of the rubber snap ring. A dust removal bag is fixedly embedded at the bottom end of the rubber snap ring. A metal pressing ring is movably connected to the top end of the rubber snap ring. A U-shaped support frame is fixedly connected to the inner wall of the metal pressing ring. A plurality of reinforcing rings are fixedly connected to the inner wall of the U-shaped support frame.

[0008] In the above-mentioned energy-saving and environment-friendly pulse bag filter, the dust cleaning mechanism includes a sector-shaped cover and a sector-shaped plate fixedly connected to the inner wall of the dust removal housing. The outer wall of the rotating shaft is fixedly sleeved with a second sealing bearing and a third sealing bearing. The outer wall of the outer ring of the second sealing bearing is fixedly connected to the outer side wall of the sector-shaped cover, and the outer wall of the outer ring of the third sealing bearing is fixedly connected to the outer wall of the sector-shaped plate. The top of the sector-shaped cover is fixedly communicated with a pulse valve. The air inlet end of the pulse valve is fixedly communicated with a first air pipe. The air inlet end of the first air pipe passes through the outer wall of the dust removal housing and is fixedly connected to a compressed air tank. The bottom end of the compressed air tank is fixedly connected to a support plate. The side end of the support plate is fixedly connected to the outer wall of the dust removal housing. The lower surface of the support plate is fixedly connected to an air extraction pump. The air outlet end of the air extraction pump is fixedly communicated with a three-way reversing solenoid valve. The horizontal air outlet end of the three-way reversing solenoid valve is fixedly communicated with a second air pipe. The air outlet end of the second air pipe fixedly penetrates through the inside of the compressed air tank. The vertical air outlet end of the three-way reversing solenoid valve is fixedly communicated with a waste heat recovery pipe. A through hole is opened at the bottom end of the compressed air tank, and the hole wall of the through hole is fixedly connected with an installation pipe. The bottom end of the installation pipe passes through the lower surface of the support plate and is fixedly connected to a first air pressure sensor.

[0009] In the above-mentioned energy-saving and environment-friendly pulse bag filter, the driving mechanism includes a driving motor fixedly connected to the upper surface of the housing cover. The driving shaft of the driving motor passes through the lower surface of the housing cover and is fixedly connected to a connecting square block. The outer wall of the connecting square block is movably sleeved with a connecting square tube. The bottom end of the connecting square tube is fixedly connected to the upper surface of the rotating shaft. A through hole matching the output end of the driving motor is opened on the upper surface of the housing cover, and the hole wall of the through hole is fixedly connected with a fourth sealing bearing for rotating the driving shaft of the driving motor.

[0010] In the above-mentioned energy-saving and environment-friendly pulse bag filter, the exhaust air mechanism includes a corrugated pipe fixedly communicated with the top end of the housing cover. The bottom end of the corrugated pipe is fixedly communicated with an air suction pipe. The bottom end of the air suction pipe is fixedly communicated with an air suction fan. The bottom end of the air suction fan is fixedly connected to a fixing frame. The side end of the fixing frame is fixedly connected to the outer wall of the support leg of the dust removal housing. The upper surface of the fixing frame is fixedly connected to a PLC controller. A fixing through hole is opened on the pipe wall of the air suction pipe, and the hole wall of the fixing through hole is fixedly connected to a second air pressure sensor.

[0011] In the above-mentioned energy-saving and environment-friendly pulse bag filter, the flue gas waste heat recovery mechanism includes a metal inlet air pipe fixedly connected to the inner wall of the air inlet hole of the dust removal housing. An insulating cover is fixedly sleeved on the outer wall of the metal inlet air pipe. The top end of the insulating cover is fixedly communicated with a third air pipe, and the intake end of the third air pipe is fixedly communicated with the top side wall of the dust removal housing. The bottom end of the insulating cover is fixedly communicated with a fourth air pipe, and the intake end of the fourth air pipe is fixedly connected to the intake end of an air extraction pump. A plurality of inclined holes are formed in the outer wall of the metal inlet air pipe located inside the insulating cover, and small heat pipes are fixedly connected to the hole walls of the inclined holes. A through hole is formed in the outer wall of the bottom end of the metal inlet air pipe, and a third air pressure sensor is fixedly connected to the hole wall of the through hole.

[0012] In the above-mentioned energy-saving and environment-friendly pulse bag filter, the sector-shaped cover and the sector-shaped plate are symmetrically distributed up and down. One of the dust removal sectors is located in the space opposite to the sector-shaped cover and the sector-shaped plate. The bottom end of the sector-shaped cover is hermetically and slidably connected to the upper surface of the bag circular plate. The bottom end of the partition plate is hermetically and slidably connected to the upper surface of the sector-shaped plate. A check butterfly valve is fixedly connected to the inner wall of the ash discharge hole of the sector-shaped plate.

[0013] In the above-mentioned energy-saving and environment-friendly pulse bag filter, two symmetrically distributed anti-blocking arc-shaped rods are fixedly connected to the bottom end of the rotating shaft, and the bottom ends of the anti-blocking arc-shaped rods are located inside the discharge port at the bottom end of the dust removal housing.

[0014] Compared with the existing technology, the advantages of an energy-saving and environment-friendly pulse bag filter are as follows: 1. By setting the filtering metal cover, the air suction mechanism and the dust removal mechanism, before the pulse bag filter works, first, the flue gas discharged from the steel plant boiler is transported to the metal inlet air pipe through a pipeline, and then the air suction mechanism and the dust removal mechanism are used to carry out dust removal work on the flue gas. Large particles in the flue gas directly fall to the bottom of the dust removal housing, medium particles are intercepted and filtered by the filtering metal cover, and finally small particles are intercepted by the dust removal bag. Moreover, the filtering metal cover filters medium particle soot, which can effectively protect the dust removal bag and prevent it from being quickly worn out due to the impact of high-speed moving medium particles, not only improving the service life of the dust removal bag, but also improving the reliability of the dust removal bag. During the dust removal process, the third air pressure sensor detects the inlet static pressure at the air inlet hole of the dust removal housing and adjusts the adsorption amount of the air suction fan according to the size of the inlet static pressure. The two are in a proportional relationship, thus avoiding the situation of excessive energy consumption caused by the large air volume suction of the air suction fan in this case. This mechanism enables the pulse bag filter to have the function of adaptively adjusting the air suction volume of the air suction fan according to the inlet static pressure of the flue gas, avoiding the situation of excessive air suction volume of the air suction fan and causing excessive energy consumption on the basis of meeting the flue gas dust removal, and further improving the energy-saving and environmental protection performance of the pulse bag filter.

[0015] 2. With the set waste heat recovery mechanism and air extraction pump, while the PLC controller controls the operation of the induced draft fan, the PLC controller also controls the start of the air extraction pump. The air extraction pump recovers the waste heat of the flue gas entering the metal air inlet pipe through the waste heat recovery mechanism, and the air with recovered heat is input into the waste heat recovery pipe and transported to the position where heating is required. During this process, not only can the heat be recovered and utilized, but also the temperature of the flue gas can be reduced, and the flue gas temperature is made lower than 80 °C. After the flue gas temperature is lower than 80 °C, dioxins in the flue gas will condense with the soot and be intercepted by the dust removal cloth bag along with the soot. In addition, the low-temperature flue gas can also avoid damaging the dust removal cloth bag. Moreover, the air with waste heat can also be filled into the compressed air tank for storage, providing sufficient pulse air source for the ash cleaning mechanism. This mechanism enables the pulse bag filter to have the functions of waste heat recovery of flue gas and efficient removal of dioxins, and can also improve the protection effect of the dust removal cloth bag by reducing the flue gas temperature, thereby improving the use effect and reliability of the pulse bag filter.

[0016] 3. With the set driving mechanism and ash cleaning mechanism, in addition, while the pulse bag filter is working, the PLC controller controls the driving end of the driving motor to rotate at a frequency of rotating 60° every 5 minutes, and drives the filter metal cover and the dust removal cloth bag of each dust removal sector into the ash cleaning mechanism for ash cleaning treatment. During this process, the hot air used for pulse ash cleaning has the characteristics of better fluidity and penetrability, and can more effectively blow off the soot attached to the surface of the dust removal cloth bag and the filter metal cover, so that there is no need to set multiple filter chambers, gate plates, lift valves, pulse ash cleaning component valves and a large number of cloth bags in the dust collector, reducing the usage amount of the cloth bags. This mechanism enables the pulse bag filter to have the function of continuously pulse cleaning the dust removal cloth bag and the filter metal cover online. The pulse bag filter does not need to pause work for ash cleaning, saving time and effort, improving the convenience and effect of using the dust collector, and optimizing the structure of the pulse bag filter, reducing the volume and manufacturing cost of the dust collector, as well as reducing the use cost of the pulse bag filter.

[0017] 4. With the set second air pressure sensor and third air pressure sensor, when the pulse bag filter is working, the second air pressure sensor detects the air pressure value of the air inlet pipe and converts the air pressure value into an electrical signal and transmits it to the PLC controller. If the inlet static pressure detected by the third air pressure sensor minus the air pressure value detected by the second air pressure sensor exceeds the preset dust removal resistance F1 of the PLC controller, the PLC controller controls the rotation frequency of the driving motor to increase, and the more it exceeds the dust removal resistance F1, the faster the PLC controller controls the rotation frequency of the driving motor, so that there is no situation where a large amount of soot adheres to the surface of the dust removal cloth bag to hinder soot filtration, ensuring the dust removal speed of the pulse bag filter. This mechanism enables the pulse bag filter to have the function of automatically adjusting the ash cleaning frequency, enabling the pulse bag filter to cope with the dust removal work of flue gas with different soot contents, and improving the reliability of using the pulse bag filter. Description of the Drawings

[0018] Figure 1 is a schematic structural view of an energy-saving and environment-friendly pulse bag filter provided by the present invention; Figure 2 is Figure 1 a partial sectional structural view of Figure 3 is a schematic structural view of a driving mechanism in an energy-saving and environment-friendly pulse bag filter provided by the present invention; Figure 4 is a schematic enlarged structural view of a dust removal bag part in an energy-saving and environment-friendly pulse bag filter provided by the present invention; Figure 5 is a schematic top view structural view of a bag round plate part in an energy-saving and environment-friendly pulse bag filter provided by the present invention; Figure 6 is a schematic top view structural view of a dust removal sector part in an energy-saving and environment-friendly pulse bag filter provided by the present invention; Figure 7 is a schematic structural view of a dust cleaning mechanism in an energy-saving and environment-friendly pulse bag filter provided by the present invention.

[0019] In the figure: 1 dust removal housing, 2 star-shaped discharger, 3 first sealing bearing, 4 bag round plate, 5 dust removal mechanism, 51 partition board, 52 dust removal sector, 53 filter metal cover, 54 installation counterbore, 55 rubber snap ring, 56 limit convex ring, 57 dust removal bag, 58 metal pressing ring, 59 U-shaped support frame, 510 reinforcing ring, 6 dust cleaning mechanism, 61 sector cover, 62 sector plate, 63 second sealing bearing, 64 third sealing bearing, 65 pulse valve, 66 first air pipe, 67 compressed air tank, 68 support plate, 69 air extraction pump, 610 three-way reversing solenoid valve, 611 second air pipe, 612 waste heat recovery pipe, 613 installation pipe, 614 first air pressure sensor, 7 driving mechanism, 71 driving motor, 72 connecting square block, 73 connecting square tube, 8 exhaust air mechanism, 81 corrugated pipe, 82 air suction pipe, 83 air suction fan, 84 fixing frame, 85 plc controller, 86 second air pressure sensor, 9 flue gas waste heat recovery mechanism, 91 metal air inlet pipe, 92 heat insulation cover, 93 third air pipe, 94 fourth air pipe, 95 small heat pipe, 96 third air pressure sensor, 10 rotating shaft, 11 shell cover, 12 check valve, 13 anti-blocking arc rod. Specific embodiments

[0020] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0021] As Figures 1 - 7 shown, an energy-saving and environment-friendly pulse bag filter includes a dust removal housing 1. A star-shaped discharger 2 is fixedly sleeved at the bottom end of the dust removal housing 1. A first sealing bearing 3 is fixedly connected to the inner wall of the dust removal housing 1. The inner wall of the inner ring of the first sealing bearing 3 is fixedly connected to a cloth bag circular plate 4. A through hole is opened on the upper surface at the center of the cloth bag circular plate 4, and a rotating shaft 10 is fixedly connected to the hole wall of the through hole. A dust removal mechanism 5 is fixedly connected to the outer wall of the rotating shaft 10. The dust removal mechanism 5 includes six partitions 51 evenly fixedly connected to the outer wall of the rotating shaft 10. The top ends of the partitions 51 are fixedly connected to the lower surface of the cloth bag circular plate 4. The outer wall of the side of the partition 51 away from the rotating shaft 10 is hermetically slidably connected to the inner wall of the dust removal housing 1. The six partitions 51 together form six dust removal sectors 52. A plurality of filter metal covers 53 are provided inside each dust removal sector 52. The top ends of the filter metal covers 53 are fixedly connected to the lower surface of the cloth bag circular plate 4. An installation counterbore 54 is opened on the upper surface of the cloth bag circular plate 4 at the top of the filter metal cover 53. A rubber snap ring 55 is movably connected to the hole wall of the installation counterbore 54. A limiting convex ring 56 is fixedly sleeved on the outer wall of the rubber snap ring 55. A dust removal cloth bag 57 is fixedly embedded at the bottom end of the rubber snap ring 55. A metal pressing ring 58 is movably connected to the top end of the rubber snap ring 55. A U-shaped support frame 59 is fixedly connected to the inner wall of the metal pressing ring 58. A plurality of reinforcing rings 510 are fixedly connected to the inner wall of the U-shaped support frame 59.

[0022] The inner wall of the dust removal housing 1 is fixedly connected with a dust cleaning mechanism 6. The dust cleaning mechanism 6 includes a sector-shaped cover 61 and a sector-shaped plate 62 fixedly connected to the inner wall of the dust removal housing 1. The outer wall of the rotating shaft 10 is fixedly sleeved with a second sealing bearing 63 and a third sealing bearing 64. The outer wall of the outer ring of the second sealing bearing 63 is fixedly connected to the outer side wall of the sector-shaped cover 61, and the outer wall of the outer ring of the third sealing bearing 64 is fixedly connected to the outer wall of the sector-shaped plate 62. The top of the sector-shaped cover 61 is fixedly communicated with a pulse valve 65. The air inlet end of the pulse valve 65 is fixedly communicated with a first air pipe 66. The air inlet end of the first air pipe 66 passes through the outer wall of the dust removal housing 1 and is fixedly connected with a compressed air tank 67. The bottom end of the compressed air tank 67 is fixedly connected with a support plate 68. The side end of the support plate 68 is fixedly connected with the outer wall of the dust removal housing 1. The lower surface of the support plate 68 is fixedly connected with an air extraction pump 69. The air outlet end of the air extraction pump 69 is fixedly communicated with a three-way reversing solenoid valve 610. The horizontal air outlet end of the three-way reversing solenoid valve 610 is fixedly communicated with a second air pipe 611. The air outlet end of the second air pipe 611 fixedly penetrates through the inside of the compressed air tank 67. The vertical air outlet end of the three-way reversing solenoid valve 610 is fixedly communicated with a waste heat recovery pipe 612. A through hole is opened at the bottom end of the compressed air tank 67, and the hole wall of the through hole is fixedly connected with a mounting pipe 613. The bottom end of the mounting pipe 613 passes through the lower surface of the support plate 68 and is fixedly connected with a first air pressure sensor 614. This mechanism optimizes the structure of the pulse bag filter, reduces the volume and manufacturing cost of the dust collector, and reduces the use cost of the pulse bag filter.

[0023] The sector-shaped cover 61 and the sector-shaped plate 62 are symmetrically distributed up and down. One of the dust removal sectors 52 is located in the space opposite to the sector-shaped cover 61 and the sector-shaped plate 62. The bottom end of the sector-shaped cover 61 is hermetically and slidably connected to the upper surface of the cloth bag circular plate 4. The bottom end of the partition plate 51 is hermetically and slidably connected to the upper surface of the sector-shaped plate 62. A check butterfly valve 12 is fixedly connected to the inner wall of the ash discharge hole of the sector-shaped plate 62. The check butterfly valve 12 can be opened unidirectionally to prevent the flue gas in the dust removal housing 1 from flushing back into the dust cleaning mechanism 6. The bottom end of the rotating shaft 10 is fixedly connected with two symmetrically distributed anti-blocking arc-shaped rods 13. The bottom ends of the anti-blocking arc-shaped rods 13 are located inside the discharge port at the bottom end of the dust removal housing 1. After the anti-blocking arc-shaped rods 13 rotate with the rotating shaft 10, it can prevent the dust from blocking at the bottom of the dust removal housing 1, thereby ensuring the ash discharge effect of the star-shaped discharger 2.

[0024] The top of the dust removal housing 1 is hermetically connected with a housing cover 11 by bolts. The top end of the housing cover 11 is fixedly connected with a driving mechanism 7 for driving the rotation of the rotating shaft 10. The driving mechanism 7 includes a driving motor 71 fixedly connected to the upper surface of the housing cover 11. The driving shaft of the driving motor 71 passes through the lower surface of the housing cover 11 and is fixedly connected with a connecting square block 72. The outer wall of the connecting square block 72 is movably sleeved with a connecting square tube 73. The bottom end of the connecting square tube 73 is fixedly connected with the upper surface of the rotating shaft 10. The upper surface of the housing cover 11 is provided with a through hole matching the output end of the driving motor 71, and the hole wall of the through hole is fixedly connected with a fourth sealing bearing for driving the rotation of the driving shaft of the driving motor 71. This mechanism enables the pulse bag filter to have the function of continuously and online pulse cleaning the dust removal bag 57 and the filter metal cover 53. The pulse bag filter does not need to pause the work for cleaning, which saves time and effort and improves the convenience and effect of using the dust remover.

[0025] The top end of the housing cover 11 is fixedly communicated with an exhaust air mechanism 8. The exhaust air mechanism 8 includes a corrugated pipe 81 fixedly communicated with the top end of the housing cover 11. The bottom end of the corrugated pipe 81 is fixedly communicated with an air suction pipe 82. The bottom end of the air suction pipe 82 is fixedly communicated with an air suction fan 83. The bottom end of the air suction fan 83 is fixedly connected with a fixing frame 84. The side end of the fixing frame 84 is fixedly connected with the outer wall of the support leg of the dust removal housing 1. The upper surface of the fixing frame 84 is fixedly connected with a plc controller 85. The pipe wall of the air suction pipe 82 is provided with a fixing through hole, and the hole wall of the fixing through hole is fixedly connected with a second air pressure sensor 86.

[0026] The inner wall of the air inlet of the dust removal housing 1 is fixedly connected with a flue gas waste heat recovery mechanism 9. The flue gas waste heat recovery mechanism 9 includes a metal air inlet pipe 91 fixedly connected with the inner wall of the air inlet hole of the dust removal housing 1. The outer wall of the metal air inlet pipe 91 is fixedly sleeved with a heat insulation cover 92. The top end of the heat insulation cover 92 is fixedly communicated with a third air pipe 93. The air inlet end of the third air pipe 93 is fixedly communicated with the side wall of the top end of the dust removal housing 1. The bottom end of the heat insulation cover 92 is fixedly communicated with a fourth air pipe 94. The air inlet end of the fourth air pipe 94 is fixedly connected with the air inlet end of an air extraction pump 69. The outer wall of the metal air inlet pipe 91 located inside the heat insulation cover 92 is provided with a plurality of inclined holes, and the hole wall of the inclined holes is fixedly connected with small heat pipes 95. The bottom outer wall of the metal air inlet pipe 91 is provided with a through hole, and the hole wall of the through hole is fixedly connected with a third air pressure sensor 96. This mechanism enables the pulse bag filter to have the functions of flue gas waste heat recovery and efficient removal of dioxin, and can also improve the protection effect of the dust removal bag 57 by reducing the flue gas temperature, and improve the use effect and reliability of the pulse bag filter.

[0027] The pulse valve 65, the air extraction pump 69, the three-way reversing solenoid valve 610 and the rotary valve 2 are all electrically connected to the output terminal of the plc controller 85 through wires. The first air pressure sensor 614, the second air pressure sensor 86 and the third air pressure sensor 96 are all electrically connected to the input terminal of the plc controller 85 through wires. The above-mentioned energized devices and electrical connections are all prior arts and will not be elaborated here.

[0028] The operating principle of the present invention is described as follows: Before the pulse bag filter works, first, the flue gas discharged from the steel plant boiler is transported through a pipeline to the metal air inlet pipe 91, and then transported to the dust removal housing 1 through the metal air inlet pipe 91. At the same time, the plc controller 85 controls the start of the suction fan 83. The suction fan 83 sucks the air at the top of the dust removal housing 1 through the suction pipe 82 and the corrugated pipe 81, so that a negative pressure area is formed at the top of the dust removal housing 1. Then, the large particles in the flue gas directly fall to the bottom of the dust removal housing 1, the medium particles are intercepted and filtered by the filter metal cover 53, and finally the small particles are intercepted by the dust removal bag 57. After that, the clean air passes through the dust removal bag 57 and the bag round plate 4 and is attracted by the negative pressure area at the top of the dust removal housing 1. Finally, the clean air is discharged through the corrugated pipe 81, the suction pipe 82 and the suction fan 83. Moreover, the filter metal cover 53 filters the medium particle soot, which can effectively protect the dust removal bag 57 and prevent it from being impacted by the fast-moving medium particles and quickly worn out. This not only improves the service life of the dust removal bag 57 but also improves the reliability of the dust removal bag 57 in use. During the dust removal process, the third air pressure sensor 96 detects the inlet static pressure at the air inlet hole of the dust removal housing 1. The third air pressure sensor 96 converts the detected data value into an electrical signal and transmits it to the plc controller 85. Moreover, the greater the inlet static pressure detected by the third air pressure sensor 96, the higher the flue gas volume input into the dust removal housing 1. At this time, the plc controller 85 controls the suction air volume of the suction fan 83 to increase accordingly. The two are in a proportional relationship, ensuring that the pulse bag filter has an efficient dust removal effect and avoiding the situation where the suction fan 83 has a large suction air volume to deal with the flue gas with low inlet static pressure. Furthermore, it avoids the situation where the large air volume suction of the suction fan 83 causes excessive energy consumption in this case, which affects the energy-saving performance of the pulse bag filter. This mechanism enables the pulse bag filter to have the function of adaptively adjusting the suction air volume of the suction fan 83 according to the inlet static pressure of the flue gas, improving the intelligence of the pulse bag filter in use, avoiding the situation where the suction air volume of the suction fan 83 is too large and causing excessive energy consumption on the basis of meeting the flue gas dust removal, and further improving the energy-saving and environmental protection performance of the pulse bag filter. While the PLC controller 85 controls the operation of the suction fan 83, the PLC controller 85 also controls the start of the air extraction pump 69. The air extraction pump 69 sucks a part of the dust-removed and clean air from the top of the dust removal mechanism 5 through the fourth air pipe 94, the heat insulation cover 92 and the third air pipe 93. When the dust-removed and clean air passes through the heat insulation cover 92, the heat of the flue gas inside the metal air inlet pipe 91 can be recovered by using the small heat pipe 95. The medium inside the small heat pipe 95 is heated and evaporated at the bottom end located inside the metal air inlet pipe 91 and rises along the internal channel of the small heat pipe 95 to the top end of the small heat pipe 95. At this time, the medium at the top end of the small heat pipe 95 dissipates heat under the action of the dust-removed and clean air, and the heat will be transferred to the dust-removed and clean air accordingly. The evaporated medium in the small heat pipe 95 cools down and liquefies into droplets due to the heat being exported, and then the droplet-shaped medium drips to the bottom end of the small heat pipe 95 to continue receiving heat transfer, so on and so forth, realizing the recovery of the heat of the flue gas inside the metal air inlet pipe 91. The air with the recovered heat is input into the waste heat recovery pipe 612 through the fourth air pipe 94, the air extraction pump 69 and the three-way reversing solenoid valve 610 and transported to the position where heating is required. In this process, not only can the heat be recovered and utilized, but also the temperature of the flue gas can be reduced, and the temperature of the flue gas is made lower than 80 degrees Celsius. After the temperature of the flue gas is lower than 80 degrees Celsius, dioxin in the flue gas will condense with the dust and be intercepted by the dust removal cloth bag 57 along with the dust. In addition, the low-temperature flue gas can also avoid damaging the dust removal cloth bag 57; During the process of the air with waste heat being discharged into the waste heat recovery pipe 612 through the air extraction pump 69, if the first air pressure sensor 614 detects that the air pressure in the compressed air tank 67 is lower than the air pressure value preset by the PLC controller 85, the PLC controller 85 controls the three-way reversing solenoid valve 610 to be energized to change the air guiding direction, so that the air with waste heat enters the second air pipe 611 through the energized three-way reversing solenoid valve 610 and is filled into the compressed air tank 67 for storage, providing sufficient pulse air source for the ash cleaning mechanism 6. This mechanism enables the pulse bag filter to have the functions of waste heat recovery of the flue gas and efficient removal of dioxin, and can also improve the protection effect of the dust removal cloth bag 57 by reducing the temperature of the flue gas, improving the use effect and reliability of the pulse bag filter; In addition, while the pulse bag filter is working, the PLC controller 85 controls the drive end of the drive motor 71 to rotate at a frequency of rotating 60° every 5 minutes. The drive end of the drive motor 71 drives the rotating shaft 10 to rotate through the connecting block 72 and the connecting square tube 73. After rotating 60°, the entire dust removal sector 52 can be rotated to the sector-shaped cover 61 and the sector-shaped plate 62. Then, through the dust cleaning mechanism 6, pulse dust cleaning work can be carried out on a plurality of filter metal covers 53 and dust removal bags 57 in the dust removal sector 52. Specifically, when the pulse bag filter is working, the filter metal covers 53 and dust removal bags 57 of five of the six dust removal sectors 52 are always used for flue gas dust removal work, and the filter metal covers 53 and dust removal bags 57 of the remaining one dust removal sector 52 are in the dust cleaning mechanism 6 for dust cleaning work. When the drive end of the drive motor 71 rotates 60°, the PLC controller 85 controls the pulse valve 65 to open. The opened pulse valve 65 guides the hot air with residual heat in the compressed air tank 67 into the sector-shaped cover 61 through the first air pipe 66. The hot air with residual heat in the sector-shaped cover 61 is then shunted into a plurality of mounting counterbores 54, and finally fills into the dust removal bag 57 for pulse reverse impact dust cleaning. And under the action of the pulse reverse air flow, the medium-sized particulate matter on the filter metal cover 53 will also be flushed away, achieving the purpose of dust cleaning. In this process, the fluidity and penetrability of the hot air are better, and it can more effectively blow off the soot attached to the surface of the dust removal bag 57 and the filter metal cover 53. Compared with the normal temperature air source, the hot air can reduce the viscosity of the soot and reduce the adsorption force between the soot and the dust removal bag 57 and the filter metal cover 53, making it easier for the soot to break away from the dust removal bag 57 and the filter metal cover 53 during the reverse impact dust removal, thereby improving the dust cleaning efficiency. Finally, the cleaned soot is discharged into the bottom of the dust removal housing 1 through the check valve 12 and finally discharged through the rotary valve 2. After the dust cleaning is completed, the clean filter metal cover 53 and dust removal bag 57 inside the dust removal sector 52 are prepared for reuse, so that there is no need to set multiple filter chambers, gate plates, lift valves, pulse dust cleaning component valves and a large number of bags in the dust collector, reducing the usage amount of the bags. This mechanism enables the pulse bag filter to have the function of continuously performing pulse dust cleaning on the dust removal bag 57 and the filter metal cover 53 online. The pulse bag filter does not need to pause work for dust cleaning, saving time and effort, improving the convenience and effect of using the dust collector, and optimizing the structure of the pulse bag filter, reducing the volume and manufacturing cost of the dust collector, as well as reducing the usage cost of the pulse bag filter; When the pulse bag filter works, the second air pressure sensor 86 detects the air pressure value of the air suction pipe 82, converts the air pressure value into an electrical signal and transmits it to the plc controller 85. If the inlet static pressure detected by the third air pressure sensor 96 minus the air pressure value detected by the second air pressure sensor 86 exceeds the dust removal resistance F1 preset by the plc controller 85, the plc controller 85 controls the rotation frequency of the drive motor 71 to increase. Moreover, the more the value exceeds the dust removal resistance F1, the faster the plc controller 85 controls the rotation frequency of the drive motor 71. For example, after the rotation frequency of the drive motor 71 is increased, the rotation frequency of the drive end of the drive motor 71 is increased to rotate 60° every 1 minute, thereby accelerating the frequency of dust cleaning of the dust removal bag 57 by the dust cleaning mechanism 6, so that there is no situation where a large amount of soot adheres to the surface of the dust removal bag 57 to hinder soot filtration, ensuring the dust removal speed of the pulse bag filter. This mechanism enables the pulse bag filter to have the function of automatically adjusting the dust cleaning frequency, enabling the pulse bag filter to cope with the dust removal work of flue gas with different soot contents and improving the reliability of the use of the pulse bag filter.

[0029] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An energy-saving and environment-friendly pulse bag dust collector, comprising a dust collecting housing (1), characterized in that: A star-shaped discharger (2) is fixedly sleeved on the bottom end of the dust removal housing (1); a first sealed bearing (3) is fixedly connected to the inner wall of the dust removal housing (1); a bag circular plate (4) is fixedly connected to the inner wall of the inner ring of the first sealed bearing (3); a through hole is opened on the upper surface at the center of the bag circular plate (4); a rotating shaft (10) is fixedly connected to the hole wall of the through hole; and a dust removal mechanism (5) is fixedly connected to the outer wall of the rotating shaft (10); A dust cleaning mechanism (6) is fixedly connected to the inner wall of the dust removal housing (1); The top of the dust removal housing (1) is sealedly connected to a housing cover (11) via bolts, and the top of the housing cover (11) is fixedly connected to a driving mechanism (7) for driving the rotating shaft (10) to rotate; The top end of the shell cover (11) is fixedly connected to an exhaust mechanism (8); A flue gas waste heat recovery mechanism (9) is fixedly connected to the inner wall of the air inlet of the dust removal housing (1).

2. The energy-saving and environment-friendly pulse bag dust collector according to claim 1 is characterized in that: The dust removal mechanism (5) comprises six partitions (51) uniformly fixedly connected to the outer wall of the rotating shaft (10), the top of the partition (51) being fixedly connected to the lower surface of the bag circular plate (4), the outer wall of the partition (51) away from the rotating shaft (10) being sealingly slidably connected to the inner wall of the dust removal housing (1), the six partitions (51) together forming six dust removal sectors (52), each of the dust removal sectors (52) being provided with a plurality of filter metal covers (53), the top of the filter metal covers (53) being fixedly connected to the lower surface of the bag circular plate (4), the bag circular plate (4) A mounting countersunk hole (54) is provided on the upper surface of the top of the filtering metal cover (53); a rubber clamp (55) is movably connected to the hole wall of the mounting countersunk hole (54); a limiting convex ring (56) is fixedly sleeved on the outer wall of the rubber clamp (55); a dust removal bag (57) is fixedly embedded at the bottom end of the rubber clamp (55); a metal pressure ring (58) is movably connected to the top end of the rubber clamp (55); a U-shaped support frame (59) is fixedly connected to the inner wall of the metal pressure ring (58); and a plurality of reinforcing rings (510) are fixedly connected to the inner wall of the U-shaped support frame (59).

3. The energy-saving and environment-friendly pulse bag dust collector according to claim 2 is characterized in that: The dust cleaning mechanism (6) comprises a fan-shaped cover (61) and a fan-shaped plate (62) fixedly connected to the inner wall of the dust removal shell (1); the outer wall of the rotating shaft (10) is fixedly sleeved with a second sealed bearing (63) and a third sealed bearing (64); the outer wall of the outer ring of the second sealed bearing (63) is fixedly connected to the outer wall of the fan-shaped cover (61); the outer wall of the outer ring of the third sealed bearing (64) is fixedly connected to the outer wall of the fan-shaped plate (62); the top of the fan-shaped cover (61) is fixedly connected to a pulse valve (65); the air inlet end of the pulse valve (65) is fixedly connected to a first air pipe (66); the air inlet end of the first air pipe (66) passes through the outer wall of the dust removal shell (1) and is fixedly connected to a compressed gas tank (67); the bottom end of the compressed gas tank (67) is fixedly connected to a support plate (68); The side end of the support plate (68) is fixedly connected to the outer wall of the dust removal shell (1); the lower surface of the support plate (68) is fixedly connected to an air pump (69); the air outlet end of the air pump (69) is fixedly connected to a three-way reversing solenoid valve (610); the lateral air outlet end of the three-way reversing solenoid valve (610) is fixedly connected to a second air pipe (611); the air outlet end of the second air pipe (611) is fixedly passed through the interior of the compressed air tank (67); the vertical air outlet end of the three-way reversing solenoid valve (610) is fixedly connected to a waste heat recovery pipe (612); a through hole is formed at the bottom end of the compressed air tank (67); a mounting pipe (613) is fixedly connected to the hole wall of the through hole; the bottom end of the mounting pipe (613) passes through the lower surface of the support plate (68) and is fixedly connected to a first air pressure sensor (614).

4. The energy-saving and environment-friendly pulse bag dust collector according to claim 1 is characterized in that: The driving mechanism (7) comprises a driving motor (71) fixedly connected to the upper surface of the shell cover (11); a driving shaft of the driving motor (71) passes through the lower surface of the shell cover (11) and is fixedly connected to a connecting block (72); an outer wall of the connecting block (72) is movably sleeved with a connecting square tube (73); a bottom end of the connecting square tube (73) is fixedly connected to the upper surface of the rotating shaft (10); a through hole matching the output end of the driving motor (71) is formed on the upper surface of the shell cover (11); and a fourth sealed bearing for rotating the driving shaft of the driving motor (71) is fixedly connected to the hole wall of the through hole.

5. The energy-saving and environment-friendly pulse bag dust collector according to claim 1 is characterized in that: The exhaust mechanism (8) comprises a bellows (81) fixedly connected to the top of the shell cover (11); the bottom end of the bellows (81) is fixedly connected to an air suction pipe (82); the bottom end of the air suction pipe (82) is fixedly connected to a suction fan (83); the bottom end of the suction fan (83) is fixedly connected to a fixing frame (84); the side end of the fixing frame (84) is fixedly connected to the outer wall of the supporting leg of the dust removal shell (1); the upper surface of the fixing frame (84) is fixedly connected to a PLC controller (85); a fixed through hole is opened in the wall of the air suction pipe (82); and a second air pressure sensor (86) is fixedly connected to the hole wall of the fixed through hole.

6. The energy-saving and environment-friendly pulse bag dust collector according to claim 3 is characterized in that: The flue gas waste heat recovery mechanism (9) comprises a metal air inlet pipe (91) fixedly connected to the inner wall of the air inlet hole of the dust removal shell (1); the outer wall of the metal air inlet pipe (91) is fixedly sleeved with a heat insulation cover (92); the top end of the heat insulation cover (92) is fixedly connected to a third air pipe (93); the air inlet end of the third air pipe (93) is fixedly connected to the top side wall of the dust removal shell (1); the bottom end of the heat insulation cover (92) is fixedly connected to a fourth air pipe (94); the air inlet end of the fourth air pipe (94) is fixedly connected to the air inlet end of an air pump (69); a plurality of inclined holes are formed on the outer wall of the metal air inlet pipe (91) located inside the heat insulation cover (92); and small heat pipes (95) are fixedly connected to the hole walls of the inclined holes; a through hole is formed on the outer wall of the bottom end of the metal air inlet pipe (91); and a third air pressure sensor (96) is fixedly connected to the hole wall of the through hole.

7. The energy-saving and environment-friendly pulse bag dust collector according to claim 3 is characterized in that: The fan-shaped cover (61) and the fan-shaped plate (62) are symmetrically arranged in the upper and lower parts, one of the dust removal sectors (52) is located in a space opposite to the fan-shaped cover (61) and the fan-shaped plate (62), the bottom end of the fan-shaped cover (61) is sealingly slidably connected to the upper surface of the bag circular plate (4), the bottom end of the partition plate (51) is sealingly slidably connected to the upper surface of the fan-shaped plate (62), and the inner wall of the ash discharge hole of the fan-shaped plate (62) is fixedly connected to a non-return butterfly valve (12).

8. The energy-saving and environment-friendly pulse bag dust collector according to claim 1 is characterized in that: The bottom end of the rotating shaft (10) is fixedly connected to two symmetrically distributed anti-blocking arc-shaped rods (13), and the bottom ends of the anti-blocking arc-shaped rods (13) are located inside the discharge port at the bottom end of the dust removal housing (1).

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