A device and process suitable for low-dust denitration of flue gas at medium temperature in the cement industry

Abstract

This invention discloses a medium-temperature, low-dust denitrification device and process for flue gas in the cement industry, relating to the technical field of denitrification devices. The invention includes a preheater, with a connecting pipe fixedly connected to its top. A protective shell is fixedly connected to the end of the connecting pipe away from the preheater. A placement plate is fixedly connected to the inner wall of the protective shell, and multiple denitrification filter bags are fixedly inserted through the inner wall of the placement plate. A shaking device, including a motor, is provided on the top of the placement plate. This invention, through the cooperation of the denitrification filter bags, motor, threaded rod, threaded long block, shaking plate, connecting rod, fixed plate, semi-arc block, long arc block plate, and short arc block plate, causes the denitrification filter bags to exhibit a wavy shaking state as the shaking plate moves left and right and up and down. This wavy shaking state of the denitrification filter bags reduces the problem of filter bag clogging caused by prolonged use.

Description

Technical Field

[0001] This invention relates to the field of denitrification equipment technology, specifically to a medium-temperature, low-dust denitrification equipment and process suitable for flue gas in the cement industry. Background Technology

[0002] The main flue gas denitrification technologies in the cement industry include selective catalytic reduction (SCR) and selective non-catalytic reduction (SNCR). For low-temperature flue gas, SCR technology can effectively reduce NOx emissions, but its reaction efficiency is low at low temperatures, thus requiring catalyst optimization or increased reaction temperature. SNCR technology is suitable for lower-temperature flue gas, utilizing a reducing agent (such as ammonia) to react with NOx within a specific temperature range to produce harmless substances. The combined application of these technologies helps improve the environmental protection level of the cement industry.

[0003] Chinese patent CN222752971U discloses a medium-temperature, low-dust denitrification device suitable for flue gas from cement clinker production lines. The device includes a dust removal and denitrification tower, which comprises an inlet flue, an ash hopper, a filter chamber, a clean air chamber, a gradually narrowing connecting flue, and a denitrification reactor, connected sequentially. The filter chamber is equipped with dust collection bags, the clean air chamber with a filter bag cleaning mechanism, the gradually narrowing connecting flue with a flow-rectifying grid, and the denitrification reactor with a high-temperature catalyst layer. This device provides a dust removal and denitrification tower whose gradually narrowing connecting flue between the dust collector and the denitrification reactor significantly uniforms the flue gas flow field entering the first catalyst layer of the denitrification reactor, thus significantly improving the denitrification effect. Furthermore, it significantly reduces construction costs. This patent has a simple structure, is easy to operate, and is worthy of promotion.

[0004] However, current denitrification devices have the following problems: In the cement production process, the particulate matter generated in the flue gas is generally fine, appearing as dust, and contains a large amount of incompletely burned or reacted materials (such as lime and silicates). Compared with other substances (such as coal, oil, etc.), these particles are usually more difficult to remove due to their relatively hard physical properties and tighter mixing with the airflow. When they are collected by dust collector bags, long-term use will cause the dust collector bags to become clogged, thereby reducing the gas filtration effect. Therefore, we propose a low-temperature, low-dust denitrification device and process suitable for flue gas in the cement industry. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a medium-temperature, low-dust denitrification device and process for flue gas in the cement industry, solving the problems mentioned in the background section.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A medium-temperature, low-dust denitrification device for flue gas in the cement industry, comprising a preheater, a connecting pipe fixedly connected to the top of the preheater, a protective shell fixedly connected to the end of the connecting pipe away from the preheater, a placement plate fixedly connected to the inner wall of the protective shell, multiple denitrification filter bags fixedly penetrating the inner wall of the placement plate, a shaking device provided at the top of the placement plate, the shaking device comprising a motor, the bottom of the motor fixedly connected to the top of the placement plate, a threaded rod fixedly connected to the output shaft of the motor, a thin rod fixedly connected to the bottom of the threaded rod, the bottom of the thin rod rotatably connected to the bottom of the inner wall of the protective shell, a threaded long block threadedly connected to the outer wall of the threaded rod, multiple shaking plates slidably connected to the side of the threaded long block, a connecting rod fixedly connected between each of the multiple shaking plates, a fixing plate fixedly connected to the outer wall of the connecting rod, and a half-shaking plate fixedly connected to the side of the fixing plate. The device consists of an arc block, a long arc block plate fixedly connected to the bottom of the placement plate, a short arc block plate fixedly connected to the bottom of the placement plate, and L-shaped blocks fixedly connected to both sides of the threaded long block. A spring is installed between the L-shaped blocks and the shaking plate. When the gas is filtered through the denitrification filter bag, the operator starts the motor. The motor's output shaft rotates the threaded rod, causing the threaded long block to move up and down. This movement of the threaded long block causes the shaking plate to move up and down, which in turn causes the connecting rod to move up and down, which in turn causes the fixed plate to move up and down, which in turn causes the semi-arc block to move up and down. The up-and-down movement of the semi-arc block alternately contacts the arc blocks of the long and short arc blocks, causing the semi-arc block to move left and right simultaneously. This left-and-right movement of the semi-arc block, through the fixed plate, causes the shaking plate to move left and right, resulting in a wave-like shaking motion of the denitrification filter bag.

[0007] According to the above technical solution, flexible support rings are fixedly connected to the top and bottom of the shaking plate. The flexible support rings are in contact with the denitrification filter bag. At the same time, the left and right movement and the up and down movement of the shaking plate will cause the flexible support rings to deform in the wave-like shaking of the denitrification filter bag. Therefore, the flexible support rings will provide support for the denitrification filter bag in the wave-like shaking.

[0008] According to the above technical solution, the side of the shaking plate is provided with several honeycomb openings. The shaking plate is in contact with the denitrification filter bag. At the same time, while the shaking plate makes the denitrification filter bag present a wave-shaped shaking state, the gas filtered by the denitrification filter bag will float out from the honeycomb openings.

[0009] According to the above technical solution, the arc blocks on the side of the long arc block plate and the arc blocks on the side of the short arc block plate are staggered.

[0010] According to the above technical solution, the arc block on the side of the long arc block is located on the displacement trajectory of the semi-arc block, and the arc block on the side of the short arc block is located on the displacement trajectory of the semi-arc block.

[0011] According to the above technical solution, the bottom of the inner wall of the protective shell is provided with an anti-secondary lifting device. The anti-secondary lifting device includes multiple track blocks, the bottoms of which are fixedly connected to the bottom of the inner wall of the protective shell. An electric push rod is fixedly connected to the bottom of the inner wall of each track block. A moving block is fixedly connected to the telescopic end of the electric push rod. An elastic telescopic rod is fixedly connected to the side of the moving block. A Z-shaped block is fixedly connected to the outer wall of the telescopic end of the elastic telescopic rod. A T-shaped clamping plate is fixedly connected to the side of the Z-shaped block. A hinge rod is hinged to the side of the T-shaped clamping plate. A connecting plate is hinged to the end of the hinge rod away from the T-shaped clamping plate. A vertical rod is fixedly connected to the bottom of the connecting plate. A plate arc disk is fixedly connected to the bottom of the vertical rod. A long half-length rod is fixedly connected to the outer wall of the thin rod. The rotation of the arc block and threaded rod causes the thin rod to rotate, which in turn causes the long semi-arc block to rotate. As the long semi-arc block rotates, it contacts the plate arc disk. This contact causes the plate arc disk to move the vertical rod away from the thin rod. The movement of the vertical rod then moves the connecting plate. This movement, via the hinge rod, causes the T-shaped clamping plate to clamp the bottom of the denitrification filter bag. The movement of the T-shaped clamping plate then causes the Z-shaped block to move. This movement stretches the telescopic end of the elastic telescopic rod. When the long semi-arc block rotates and no longer contacts the plate arc disk, the elastic telescopic rod uses its own elasticity to reset its telescopic end. The reset of the telescopic end of the elastic telescopic rod resets the Z-shaped block, which in turn resets the T-shaped clamping plate, and so on.

[0012] According to the above technical solution, a timer is provided on the side of the protective shell. The timer is electrically connected to the electric push rod. A pointer is fixedly connected to the outer wall of the fixed end of the elastic telescopic rod. A scale groove is opened on the side of the track block. The pointer contacts the side of the track block with the scale groove. Every 24 hours, the height of the particles falling to the bottom of the denitrification filter bag will rise by 5 centimeters. Therefore, the timer will start the electric push rod once every 24 hours. The telescopic end of the electric push rod will push the moving block to move upward. The upward movement of the moving block will drive the elastic telescopic rod to move upward. The upward movement of the elastic telescopic rod will drive the Z-shaped block to move upward. The upward movement of the Z-shaped block will drive the T-shaped clamping plate to move upward. The upward movement of the T-shaped clamping plate will drive the hinge rod to move upward. The upward movement of the hinge rod will drive the connecting plate to move upward. The upward movement of the connecting plate will drive the vertical rod to move upward.

[0013] According to the above technical solution, the denitrification filter bag is located on the displacement trajectory of the T-shaped clamping plate, and the plate arc disk is located on the displacement trajectory of the long semi-arc block.

[0014] A medium-temperature, low-dust denitrification process for flue gas in the cement industry includes the following steps; S1. The gas is heated by a preheater and then sent into the denitrification filter bag. S2. When the gas is being filtered in the denitrification filter bag, the staff starts the motor. The output shaft of the motor will cause the threaded rod to rotate. The rotation of the threaded rod will cause the threaded block to move up and down. The up and down movement of the threaded block will cause the vibrating plate to move up and down. S3. The up-and-down movement of the shaking plate will cause the connecting rod to move up and down, the up-and-down movement of the connecting rod will cause the fixed plate to move up and down, the up-and-down movement of the fixed plate will cause the semi-arc block to move up and down, and the up-and-down movement of the semi-arc block will alternately abut against the arc blocks of the long arc block plate and the short arc block plate. S4. This causes the semi-circular block to move left and right while moving up and down. The left and right movement of the semi-circular block will drive the shaking plate to move left and right through the fixed plate. The left and right movement and up and down movement of the shaking plate will cause the denitrification filter bag to present a wave-shaped shaking state. While the shaking plate makes the denitrification filter bag present a wave-shaped shaking state, the gas filtered by the denitrification filter bag will float out from the honeycomb opening. S5. At this time, the temperature range of the denitrification filter bag is 180-220°C. Then, the high-temperature fan draws the gas into the dust collector and processes it. The processed gas is discharged through the tail exhaust fan, forming flue gas.

[0015] This invention provides a medium-temperature, low-dust denitrification device and process suitable for flue gas in the cement industry. It has the following beneficial effects: (1) The present invention, through the cooperation of denitrification filter bag, motor, threaded rod, threaded long block, shaking plate, connecting rod, fixing plate, semi-arc block, long arc block plate and short arc block plate, makes the denitrification filter bag present a wave-shaped shaking state when the shaking plate moves left and right and up and down. The wave-shaped shaking state of the denitrification filter bag will reduce the problem of denitrification filter bag clogging due to long-term use; at the same time, through the cooperation of shaking plate, support ring and denitrification filter bag, the flexible support ring will deform with the wave-shaped shaking of the denitrification filter bag when the shaking plate moves left and right and up and down. Therefore, the flexible support ring will provide support for the denitrification filter bag in the wave-shaped shaking. This support can prevent the problem of space shrinkage caused by the wave-shaped shaking of the denitrification filter bag.

[0016] (2) The present invention uses the combination of the shaking plate, the denitrification filter bag and the honeycomb opening to make the denitrification filter bag shake in a wave-like state. At the same time, the gas filtered by the denitrification filter bag will float out from the honeycomb opening, thereby avoiding the shaking plate from blocking the surface of the denitrification filter bag, which would cause poor gas flow and result in uneven pressure on the denitrification filter bag, leading to the problem of denitrification filter bag damage or shortened service life.

[0017] (3) The present invention, through the cooperation of track block, electric push rod, moving block, elastic telescopic rod, Z-shaped block, T-shaped clamping plate, hinge rod, connecting plate, vertical rod, plate arc disk, and long semi-arc block, ensures that when the T-shaped clamping plate is not clamping the denitrification filter bag, the blockage inside the denitrification filter bag will fall to the lower part of the denitrification filter bag. When the T-shaped clamping plate clamps the denitrification filter bag, it can prevent the blockage that has fallen to the lower part of the denitrification filter bag from being lifted up again when the denitrification filter bag makes a wave-like movement. At the same time, through the elastic telescopic rod, Z-shaped block, T-shaped clamping plate, hinge rod, connecting plate, vertical rod, plate arc disk, and long semi-arc block, the present invention can prevent the blockage inside the denitrification filter bag from being lifted up again when the denitrification filter bag makes a wave-like movement. The timer, when used in conjunction with the vertical rod, causes the plate arc disk to move upwards, ensuring that the T-shaped clamping plate remains above the height of the particles. This prevents the particles inside the denitrification filter bag from being thrown up again. Simultaneously, the elastic telescopic rod, pointer scale groove, and denitrification filter bag work together to move the pointer on the scale groove surface with each movement of the fixed end of the elastic telescopic rod. This allows workers to adjust the duration of the next cement denitrification treatment by observing the pointer and scale groove indication each time the denitrification filter bag is disassembled and cleaned. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the entire invention; Figure 2 This is a schematic diagram of the structure at the placement plate of the present invention; Figure 3 This is a schematic diagram of the threaded rod structure of the present invention; Figure 4 This is a schematic diagram of the structure of the shaking plate in this invention; Figure 5 This is a schematic diagram of the flexible support ring structure of the present invention; Figure 6 This is a schematic diagram of the structure at the timer of the present invention; Figure 7 This is a schematic diagram of the structure of the T-shaped clamping plate of the present invention; Figure 8 This is a schematic diagram of the structure of the scale groove in this invention.

[0019] In the diagram: 1. Preheater; 2. Connecting pipe; 3. Protective shell; 4. Placement plate; 5. Denitrification filter bag; 6. Shaking device; 61. Motor; 62. Threaded rod; 63. Thin rod; 64. Threaded long block; 65. Shaking plate; 66. Connecting rod; 67. Fixing plate; 68. Semi-arc block; 69. Long arc block plate; 610. Short arc block plate; 611. L-shaped block; 612. Spring; 613. Flexible support ring; 614. Honeycomb opening; 7. Anti-secondary lifting device; 71. Track block; 72. Electric push rod; 73. Moving block; 74. Elastic telescopic rod; 75. Z-shaped block; 76. T-shaped clamping plate; 77. Hinge rod; 78. Connecting plate; 79. Vertical rod; 710. Plate arc disk; 711. Long semi-arc block; 712. Timer; 713. Pointer; 714. Scale groove. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0021] Please see Figures 1-8 One embodiment of the present invention is as follows: a medium-temperature, low-dust denitrification device for flue gas in the cement industry, comprising a preheater 1, a connecting pipe 2 fixedly connected to the top of the preheater 1, a protective shell 3 fixedly connected to the end of the connecting pipe 2 away from the preheater 1, a placement plate 4 fixedly connected to the inner wall of the protective shell 3, a plurality of denitrification filter bags 5 fixedly passing through the inner wall of the placement plate 4, a shaking device 6 provided on the top of the placement plate 4, the shaking device 6 comprising a motor 61, the bottom of the motor 61 fixedly connected to the top of the placement plate 4, a threaded rod 62 fixedly connected to the output shaft of the motor 61, a thin rod 63 fixedly connected to the bottom of the threaded rod 62, the bottom of the thin rod 63 rotatably connected to the bottom of the inner wall of the protective shell 3, a threaded long block 64 threadedly connected to the outer wall of the threaded rod 62, a plurality of shaking plates 65 slidably connected to the side of the threaded long block 64, and a connecting rod 66 fixedly connected between each of the plurality of shaking plates 65. A fixing plate 67 is fixedly connected to the outer wall of the connecting rod 66. A semi-arc block 68 is fixedly connected to the side of the fixing plate 67. A long arc block plate 69 is fixedly connected to the bottom of the placement plate 4. A short arc block plate 610 is fixedly connected to the bottom of the placement plate 4. L-shaped blocks 611 are fixedly connected to both sides of the threaded long block 64. A spring 612 is provided between the L-shaped block 611 and the shaking plate 65. The arc blocks on the side of the long arc block plate 69 and the arc blocks on the side of the short arc block plate 610 are staggered. The arc blocks on the side of the long arc block plate 69 are located on the displacement trajectory of the semi-arc block 68, and the arc blocks on the side of the short arc block plate 610 are located on the displacement trajectory of the semi-arc block 68. Through the above structure, the denitrification filter bag 5 will present a wave-shaped shaking state when the shaking plate 65 moves left and right and up and down. The wave-shaped shaking state of the denitrification filter bag 5 will reduce the problem of clogging of the denitrification filter bag 5 due to long-term use.

[0022] Flexible support rings 613 are fixedly connected to the top and bottom of the shaking plate 65. The flexible support rings 613 are in contact with the denitrification filter bag 5. With the above structure, the flexible support rings 613 will deform along with the wave-like shaking of the denitrification filter bag 5 as the shaking plate 65 moves left and right and up and down. Therefore, the flexible support rings 613 will provide support for the denitrification filter bag 5 in the wave-like shaking. This support can prevent the space from shrinking when the denitrification filter bag 5 is wave-like shaking.

[0023] The shaking plate 65 has several honeycomb openings 614 on its side. The shaking plate 65 is in contact with the denitrification filter bag 5. Through the above structure, the shaking plate 65 makes the denitrification filter bag 5 shake in a wave-like manner. At the same time, the gas filtered by the denitrification filter bag 5 will float out from the honeycomb openings 614. This avoids the shaking plate 65 blocking the surface of the denitrification filter bag 5, which would cause poor gas flow and uneven pressure on the denitrification filter bag 5, resulting in damage or shortened service life of the denitrification filter bag 5.

[0024] In operation, the gas is heated by preheater 1 and then sent into the denitrification filter bag 5. The temperature of the filter bag 5 is 180-220°C. A high-temperature fan then draws the gas into a dust collector for processing. The treated gas is discharged through a tail fan, forming flue gas. While the gas is being filtered through the denitrification filter bag 5, the operator starts motor 61. The output shaft of motor 61 rotates the threaded rod 62, causing the threaded long block 64 to move up and down. This movement of the threaded long block 64 causes the vibrating plate 65 to move up and down, which in turn causes the connecting rod 66 to move up and down. This movement of the connecting rod 65 causes the fixing plate 67 to move up and down, which in turn causes the semi-arc block 68 to move up and down. The up-and-down movement of the semi-arc block 68 alternately contacts the arc blocks of the long arc plate 69 and the short arc plate 610, causing the semi-arc block 68 to move left and right simultaneously with its up-and-down movement. The fixed plate 67 drives the shaking plate 65 to move left and right. The shaking plate 65's left-right and up-down movement causes the denitrification filter bag 5 to vibrate in a wavy pattern. This wavy vibration reduces the risk of clogging the denitrification filter bag 5 over time. Simultaneously, the flexible support ring 613 deforms along with the wavy vibration of the denitrification filter bag 5, providing support and preventing the space from shrinking due to the wavy vibration. Furthermore, while the shaking plate 65 causes the denitrification filter bag 5 to vibrate in a wavy pattern, the filtered gas escapes from the honeycomb opening 614, preventing the shaking plate 65 from obstructing the surface of the denitrification filter bag 5 and causing uneven pressure, which could lead to damage or shorten its lifespan.

[0025] Please see Figures 1-8Based on the above embodiments, in another embodiment of the present invention, a secondary lifting prevention device 7 is provided at the bottom of the inner wall of the protective shell 3. The secondary lifting prevention device 7 includes multiple track blocks 71, the bottoms of which are all fixedly connected to the bottom of the inner wall of the protective shell 3. An electric push rod 72 is fixedly connected to the bottom of the inner wall of the track block 71. A moving block 73 is fixedly connected to the telescopic end of the electric push rod 72. An elastic telescopic rod 74 is fixedly connected to the side of the moving block 73. A Z-shaped block 75 is fixedly connected to the outer wall of the telescopic end of the elastic telescopic rod 74. A T-shaped clamping plate 76 is fixedly connected to the side of the Z-shaped block 75. A hinge rod 77 is hinged to the side of the T-shaped clamping plate 76. The hinge rod 77 is away from the T-shaped clamping plate 76. One end of the 6 is hinged to a connecting plate 78, the bottom of the connecting plate 78 is fixedly connected to a vertical rod 79, the bottom of the vertical rod 79 is fixedly connected to a plate arc disk 710, the outer wall of the thin rod 63 is fixedly connected to a long semi-arc block 711, the denitrification filter bag 5 is located on the displacement trajectory of the T-shaped clamping plate 76, and the plate arc disk 710 is located on the displacement trajectory of the long semi-arc block 711. With the above structure, when the T-shaped clamping plate 76 is not clamping the denitrification filter bag 5, the blockage inside the denitrification filter bag 5 will fall to the bottom inside the denitrification filter bag 5. When the T-shaped clamping plate 76 clamps the denitrification filter bag 5, it can prevent the blockage that has fallen to the bottom inside the denitrification filter bag 5 from being lifted up again when the denitrification filter bag 5 is making a wave-like movement.

[0026] A timer 712 is provided on the side of the protective shell 3. The timer 712 is electrically connected to the electric push rod 72. A pointer 713 is fixedly connected to the outer wall of the fixed end of the elastic telescopic rod 74. A scale groove 714 is opened on the side of the track block 71. The pointer 713 is in contact with the side of the track block 71 with the scale groove 714. With the above structure, the pointer 713 will move on the surface of the scale groove 714 each time the fixed end of the elastic telescopic rod 74 moves. This allows the staff to adjust the duration of the next cement denitrification treatment by the pointer 713 and the scale groove 714 each time the denitrification filter bag 5 is disassembled and cleaned.

[0027] In use, the rotation of the threaded rod 62 drives the thin rod 63 to rotate, which in turn drives the long semi-arc block 711 to rotate. When the long semi-arc block 711 rotates, it contacts the plate arc disk 710. This contact causes the vertical rod 79 to move away from the thin rod 63. The movement of the vertical rod 79 then moves the connecting plate 78. This movement of the connecting plate 78, via the hinge rod 77, causes the T-shaped clamping plate 76 to clamp the lower part of the denitrification filter bag 5. The movement of the T-shaped clamping plate 76 then moves the Z-shaped block 75, which in turn stretches the elastic telescopic rod 74. When the long semi-arc block 711 rotates without contacting the plate arc disk 710, the elastic telescopic rod 74 will reset its telescopic end through its own elastic force. The reset of the telescopic end of the elastic telescopic rod 74 will reset the Z-shaped block 75, and the reset of the Z-shaped block 75 will reset the T-shaped clamping plate 76. This process repeats. When the T-shaped clamping plate 76 is not clamping the denitrification filter bag 5, the blockage inside the denitrification filter bag 5 will fall to the bottom inside the denitrification filter bag 5. When the T-shaped clamping plate 76 clamps the denitrification filter bag 5, it can prevent the blockage that has fallen to the bottom inside the denitrification filter bag 5 from being thrown up again when the denitrification filter bag 5 is making a wave-like movement. Every 24 hours, the height of particles falling to the bottom of the denitrification filter bag 5 increases by 5 centimeters. Therefore, timer 712 will activate electric push rod 72 every 24 hours. The telescopic end of electric push rod 72 will push moving block 73 upward. The upward movement of moving block 73 will drive elastic telescopic rod 74 upward. The upward movement of elastic telescopic rod 74 will drive Z-shaped block 75 upward. The upward movement of Z-shaped block 75 will drive T-shaped clamping plate 76 upward. The upward movement of T-shaped clamping plate 76 will drive hinge rod 77 upward. The upward movement of hinge rod 77 will drive connecting plate 78 upward. The upward movement of the connecting plate 78 will cause the vertical rod 79 to move upward, and the upward movement of the vertical rod 79 will cause the plate arc disk 710 to move upward. Therefore, the upward movement of the T-shaped clamping plate 76 will always be above the height of the particles, thus ensuring that the T-shaped clamping plate 76 can prevent the particles inside the denitrification filter bag 5 from being lifted up again. At the same time, the fixed end of the elastic telescopic rod 74 will cause the pointer 713 to move on the surface of the scale groove 714 each time it moves. This allows the staff to adjust the duration of the next cement denitrification treatment by the pointer 713 and the scale groove 714 each time the denitrification filter bag 5 is disassembled and cleaned.

[0028] It should be noted that the maximum extension length of the electric push rod 72 is equal to the height of the long semi-circular block 711.

[0029] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A medium-temperature, low-dust denitrification device for flue gas in the cement industry, comprising a preheater (1), wherein a connecting pipe (2) is fixedly connected to the top of the preheater (1), a protective shell (3) is fixedly connected to the end of the connecting pipe (2) away from the preheater (1), a placement plate (4) is fixedly connected to the inner wall of the protective shell (3), and a plurality of denitrification filter bags (5) are fixedly inserted through the inner wall of the placement plate (4), characterized in that: A shaking device (6) is provided on the top of the placement plate (4). The shaking device (6) includes a motor (61). The bottom of the motor (61) is fixedly connected to the top of the placement plate (4). The output shaft of the motor (61) is fixedly connected to a threaded rod (62). The bottom of the threaded rod (62) is fixedly connected to a thin rod (63). The bottom of the thin rod (63) is rotatably connected to the bottom of the inner wall of the protective shell (3). A threaded long block (64) is threadedly connected to the outer wall of the threaded rod (62). Multiple shaking devices are slidably connected to the side of the threaded long block (64). A connecting rod (66) is fixedly connected between the multiple shaking plates (65). A fixing plate (67) is fixedly connected to the outer wall of the connecting rod (66). A semi-arc block (68) is fixedly connected to the side of the fixing plate (67). A long arc block plate (69) is fixedly connected to the bottom of the placement plate (4). A short arc block plate (610) is fixedly connected to the bottom of the placement plate (4). L-shaped blocks (611) are fixedly connected to both sides of the threaded long block (64). A spring (612) is provided between the L-shaped block (611) and the shaking plate (65).

2. The medium-temperature, low-dust denitrification device for flue gas in the cement industry according to claim 1, characterized in that: The top and bottom of the shaking plate (65) are fixedly connected with flexible support rings (613), and the flexible support rings (613) are in contact with the denitrification filter bag (5).

3. The medium-temperature, low-dust denitrification device for flue gas in the cement industry according to claim 1, characterized in that: The side of the shaking plate (65) has several honeycomb openings (614), and the shaking plate (65) is in contact with the denitrification filter bag (5).

4. A medium-temperature, low-dust denitrification device for flue gas in the cement industry according to claim 3, characterized in that: The arc blocks on the side of the long arc block plate (69) and the arc blocks on the side of the short arc block plate (610) are staggered.

5. A medium-temperature, low-dust denitrification device for flue gas in the cement industry according to claim 4, characterized in that: The arc blocks on the side of the long arc block plate (69) are located on the displacement trajectory of the half arc block (68), and the arc blocks on the side of the short arc block plate (610) are located on the displacement trajectory of the half arc block (68).

6. A medium-temperature, low-dust denitrification device for flue gas in the cement industry according to claim 1, characterized in that: The bottom of the inner wall of the protective shell (3) is provided with an anti-secondary lifting device (7). The anti-secondary lifting device (7) includes multiple track blocks (71). The bottom of each track block (71) is fixedly connected to the bottom of the inner wall of the protective shell (3). An electric push rod (72) is fixedly connected to the bottom of the inner wall of each track block (71). A moving block (73) is fixedly connected to the telescopic end of the electric push rod (72). An elastic telescopic rod (74) is fixedly connected to the side of the moving block (73). The extension of the elastic telescopic rod (74) is... A Z-shaped block (75) is fixedly connected to the outer wall of the constricted end. A T-shaped clamping plate (76) is fixedly connected to the side of the Z-shaped block (75). A hinge rod (77) is hinged to the side of the T-shaped clamping plate (76). A connecting plate (78) is hinged to the end of the hinge rod (77) away from the T-shaped clamping plate (76). A vertical rod (79) is fixedly connected to the bottom of the connecting plate (78). A plate arc disk (710) is fixedly connected to the bottom of the vertical rod (79). A long semi-arc block (711) is fixedly connected to the outer wall of the thin rod (63).

7. A medium-temperature, low-dust denitrification device for flue gas in the cement industry according to claim 6, characterized in that: A timer (712) is provided on the side of the protective shell (3). The timer (712) is electrically connected to the electric push rod (72). A pointer (713) is fixedly connected to the outer wall of the fixed end of the elastic telescopic rod (74). A scale groove (714) is provided on the side of the track block (71). The pointer (713) is in contact with the side of the track block (71) where the scale groove (714) is provided.

8. A medium-temperature, low-dust denitrification device for flue gas in the cement industry according to claim 7, characterized in that: The denitrification filter bag (5) is located on the displacement trajectory of the T-shaped clamping plate (76), and the plate arc disk (710) is located on the displacement trajectory of the long semi-arc block (711).

9. A medium-temperature, low-dust denitrification process for flue gas in the cement industry, characterized in that, The denitrification apparatus according to any one of claims 1-8 includes the following steps; S1. Heat the gas through the preheater (1), and then send the preheated gas into the denitrification filter bag (5). S2. When the gas is filtered in the denitrification filter bag (5), the staff starts the motor (61). The output shaft of the motor (61) will cause the threaded rod (62) to rotate. The rotation of the threaded rod (62) will cause the threaded block (64) to move up and down. The up and down movement of the threaded block (64) will drive the shaking plate (65) to move up and down. S3. The up-and-down movement of the shaking plate (65) will cause the connecting rod (66) to move up and down. The up-and-down movement of the connecting rod (66) will cause the fixing plate (67) to move up and down. The up-and-down movement of the fixing plate (67) will cause the semi-arc block (68) to move up and down. The up-and-down movement of the semi-arc block (68) will alternately abut against the arc blocks of the long arc block plate (69) and the short arc block plate (610). S4, thereby causing the semi-circular block (68) to move left and right while moving up and down. The left and right movement of the semi-circular block (68) will drive the shaking plate (65) to move left and right through the fixed plate (67). The left and right movement and up and down movement of the shaking plate (65) will cause the denitrification filter bag (5) to present a wave-shaped shaking state. While the shaking plate (65) causes the denitrification filter bag (5) to present a wave-shaped shaking state, the gas filtered by the denitrification filter bag (5) will drift out from the honeycomb opening 614. S5. At this time, the temperature range of the denitrification filter bag (5) is 180-220°C. Then, the high-temperature fan draws the gas into the dust collector and processes it in the dust collector. The processed gas is discharged through the tail exhaust fan to form smoke.

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