Closed conveying device for high-temperature (900-1200 DEG C) sodium sulfide hot melt

Abstract

The invention discloses a closed conveying device for high-temperature (900-1200 DEG C) sodium sulfide hot melt. The closed conveying device comprises hot melt conveying main body equipment, a connecting hopper with an upward opening is clamped in the center of the front end of the hot melt conveying main body equipment, and the rear end of the connecting hopper is rotationally connected into the front end of the hot melt conveying main body equipment; the lower end of the connecting hopper is fixedly connected with a hopper support, the rear side of the connecting hopper is sleeved with two limiting supporting rings, a variable frequency motor is arranged on the front side of the lower end of the hot melt conveying body equipment, and a negative pressure monitoring box is arranged at the rear end of the hot melt conveying body equipment. Full-sealing design is adopted among the hot melt conveying main body equipment, the connecting hopper and the negative pressure monitoring box, sealing and position limiting are conducted through the inner sealing ring and the outer sealing ring, leakage of the high-temperature sodium sulfide hot melt in the transferring process is effectively prevented, and potential safety hazards to operators and pollution to the environment are reduced; and in addition, the full-closed environment can ensure that the high-temperature sodium sulfide hot melt material can be stably, continuously and uninterruptedly transferred.

Description

Technical Field

[0001] The invention belongs to the technical field related to chemical production, and in particular relates to a closed conveying device for high-temperature (900° C.-1200° C.) alkali sulfide hot melt material. Background Art

[0002] Sodium sulfide is hot-melting under high temperature conditions (900℃-1200℃), and needs to be transported safely and efficiently. However, when facing such high-temperature hot-melt alkali sulfide, the existing conveying devices mostly use dump trucks to transport it on tracks, which have problems such as poor sealing performance, easy leakage, poor temperature resistance, unstable transportation, high energy consumption, etc., which not only affect production efficiency, but also may cause safety hazards to the environment and operators. This not only affects production efficiency, but may also cause equipment failures such as corrosion, increase maintenance costs, and poor product quality.

[0003] Therefore, a new type of high-temperature alkali sulfide hot melt closed conveying device is urgently needed to solve the problems existing in the traditional conveying method. Summary of the invention

[0004] The purpose of the present invention is to provide a closed conveying device for high-temperature (900℃-1200℃) alkali sulfide hot melt material to solve the problems of poor sealing performance, easy leakage, poor temperature resistance and unstable conveying of traditional high-temperature alkali sulfide hot melt material conveying devices proposed in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a closed conveying device for high-temperature (900℃-1200℃) alkali sulfide hot melt material, comprising a hot melt conveying main device, a connecting hopper with an opening upward is clamped inside the center of the front end of the hot melt conveying main device, and the rear end of the connecting hopper is rotatably connected to the front end of the hot melt conveying main device, the lower end of the connecting hopper is fixedly connected to a hopper bracket, and two limit support rings are sleeved on the outer side of the rear side of the connecting hopper, a frequency conversion motor is arranged on the front side of the lower end of the hot melt conveying main device, a negative pressure monitoring box is arranged at the rear end of the hot melt conveying main device, and the hot melt conveying main device is clamped inside the center of the front end of the negative pressure monitoring box and is rotatably connected to the negative pressure monitoring box, the lower end of the negative pressure monitoring box is connected to a hot melt tank, and the two limit support rings and the lower end of the frequency conversion motor are provided with a support base, and are fixedly connected to the upper ends of the three support bases by a bolt assembly.

[0006] Preferably, the front end of the variable frequency motor is connected to a gearbox via a rotating shaft, and a gear seat is provided on the left side of the rear end of the gearbox. The gear seat is located on the front side of the lower end of the hot melt material conveying main equipment, and is fixedly connected to the upper end of the frontmost support base by a bolt assembly.

[0007] Preferably, support gears are rotatably connected inside the left and right sides of the upper end of the gear seat, a transmission gear is rotatably connected inside the center of the upper end of the gear seat, and the transmission gear is rotatably connected to the gearbox through a connecting shaft.

[0008] Preferably, the two supporting gears and the transmission gear are rollingly connected to the hot melt conveying main device through a driven gear ring, and the driven gear ring is fixedly connected to the outside of the front side of the hot melt conveying main device and meshes with the two supporting gears and the transmission gear.

[0009] Preferably, the two limit support rings are clamped with the hot melt material conveying main device through a limit clamp ring, and the two limit clamp rings are fixedly connected to the outside of the rear side of the hot melt material conveying main device, and a plurality of resistance reducing rollers are rotatably connected inside the limit support ring, and the plurality of resistance reducing rollers are rollingly connected to the outside of the limit clamp ring.

[0010] Preferably, a converter liner is provided inside the main hot melt conveying device, spiral pushing blades are fixedly connected to the inner wall of the converter liner, and both the converter liner and the pushing blades are made of nickel-based alloy.

[0011] Preferably, the hot melt material conveying main device and the connecting hopper and the negative pressure monitoring box are sealed by inner and outer sealing rings, and the position is limited by the inner and outer sealing rings. The two groups of inner and outer sealing rings are respectively fixedly connected to the outside of the rear end of the hot melt material conveying main device and the outside of the rear end of the connecting hopper.

[0012] Preferably, the two groups of inner and outer sealing rings are respectively located inside and outside the front end of the hot melt conveying main equipment and inside and outside the front end of the negative pressure monitoring box, and the connecting hopper is made of high temperature resistant and corrosion resistant materials.

[0013] Preferably, the front side of the upper end of the negative pressure monitoring box is connected to a heat exchanger through a connecting pipe, the rear side of the heat exchanger is connected to an alkali solution absorption tank through a connecting pipe, and the alkali solution absorption tank is fixedly connected to the rear side of the upper end of the negative pressure monitoring box.

[0014] Preferably, the upper rear side of the alkali solution absorption tank is connected to an induced draft fan through a connecting pipe, and a filter element is arranged inside the opening of the other end of the induced draft fan. Two monitoring sensors are plugged into the rear end of the negative pressure monitoring box, and the two monitoring sensors are connected to the variable frequency motor, gearbox and induced draft fan through a regulating mechanism.

[0015] Compared with the prior art, the present invention provides a closed conveying device for high-temperature (900°C-1200°C) alkali sulfide hot melt, which has the following beneficial effects:

[0016] 1. Good sealing performance: The hot melt conveying main equipment is fully sealed with the connecting hopper and negative pressure monitoring box. The internal and external sealing rings are used to seal and limit the position, which effectively prevents the leakage of high-temperature alkali sulfide hot melt during transportation, reduces the safety hazards to operators and the pollution to the environment, and the fully enclosed environment can ensure the stable, continuous and uninterrupted transportation of high-temperature alkali sulfide hot melt, thereby improving production efficiency.

[0017] Avoiding the hot melt from contacting with air and impurities in the air ensures the quality of the high-temperature alkali sulfide hot melt during transportation.

[0018] 2. Materials are resistant to high temperature and corrosion: The connecting hopper, converter liner and pushing blades are made of high temperature and corrosion resistant materials, which reduces the equipment failure rate, ensures stable equipment operation, reduces maintenance costs and increases equipment service life.

[0019] 3. Accurately control the transfer: The frequency conversion motor drives the transmission gear to rotate through the gearbox. The transmission gear engages with the driven gear ring to drive the hot melt conveying main equipment to rotate. The speed of the hot melt conveying main equipment can be accurately controlled by controlling the current and the speed change of the gearbox, thereby controlling the transfer speed and flow of the high-temperature alkali sulfide hot melt to meet the needs of different production processes. The two supporting gears are located on both sides of the transmission gear to support the driven gear ring, stabilize the transmission connection, prevent the hot melt conveying main equipment from skewing, and ensure stable transmission.

[0020] 4. Reduce energy consumption and wear: The limit support ring is connected to the hot melt conveying main equipment through a limit clamping ring, and multiple resistance-reducing rollers are connected internally to reduce the rotational resistance of the hot melt conveying main equipment, which can reduce energy consumption and reduce wear between components.

[0021] 5. Perfect temperature and flow monitoring and control: The monitoring sensor inside the rear end of the negative pressure monitoring box is used for temperature and flow monitoring. When the temperature is abnormal, the speed of the variable frequency motor and the induced draft fan is adjusted through the control mechanism to control the speed of the hot melt conveying main equipment and the speed of hot air taking away, thereby effectively controlling the temperature and preventing the internal temperature from being too high and affecting the product quality.

[0022] 6. More environmentally friendly: The heat exchanger, alkali solution absorption tank and induced draft fan form a recovery unit to recycle and process the flue gas inside the negative pressure monitoring box to prevent environmental pollution, while taking away part of the temperature to keep the internal temperature stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the three-dimensional structure of the closed conveying device of the present invention.

[0024] Figure 2 It is a right view structural schematic diagram of the closed conveying device of the present invention.

[0025] Figure 3 It is a schematic diagram of the connection structure of the negative pressure monitoring box of the present invention.

[0026] Figure 4 It is a schematic diagram of the three-dimensional cross-sectional structure of the closed conveying device of the present invention.

[0027] Figure 5 For the present invention Figure 4 Enlarged schematic diagram at point A in the middle.

[0028] Figure 6 It is a schematic diagram of the gear seat connection structure of the present invention.

[0029] Figure 7 For the present invention Figure 4 Enlarged schematic diagram of point B in the middle.

[0030] Figure 8 It is a schematic diagram of the drag-reducing roller connection structure of the present invention.

[0031] Fig. 9 It is the operation flow chart of the closed conveying device of the present invention.

[0032] In the figure: 1. Main equipment for hot melt conveying; 2. Connecting hopper; 3. Hopper bracket; 4. Limit support ring; 5. Frequency conversion motor; 6. Negative pressure monitoring box; 7. Hot melt tank; 8. Support base; 9. Gearbox; 10. Gear seat; 11. Support gear; 12. Transmission gear; 13. Driven gear ring; 14. Limit clamp ring; 15. Resistance reduction roller; 16. Converter liner; 17. Pushing blade; 18. Heat exchanger; 19. Alkali solution absorption tank; 20. Draft fan; 21. Monitoring sensor. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] The present invention provides Figure 1-Figure 8The device is a closed conveying device for high-temperature (900°C-1200°C) alkali sulfide hot melt material, comprising a hot melt conveying main device 1, a connecting hopper 2 with an opening facing upward is clamped inside the center of the front end of the hot melt conveying main device 1, and the rear end of the connecting hopper 2 is rotatably connected to the front end of the hot melt conveying main device 1, a hopper bracket 3 is fixedly connected to the lower end of the connecting hopper 2, and two limit support rings 4 are sleeved on the rear side of the connecting hopper 2, a frequency conversion motor 5 is arranged on the front side of the lower end of the hot melt conveying main device 1, a negative pressure monitoring box 6 is arranged at the rear end of the hot melt conveying main device 1, and the hot melt conveying main device 1 is clamped inside the center of the front end of the negative pressure monitoring box 6 and is rotatably connected to the negative pressure monitoring box 6, the lower end of the negative pressure monitoring box 6 is connected to a hot melt tank 7, and the two limit support rings 4 and the lower ends of the frequency conversion motor 5 are provided with a support base 8 , and is fixedly connected to the upper ends of the three supporting bases 8 by bolt assemblies. During the transportation of the high-temperature alkali sulfide hot melt material, the connecting hopper 2 and the hopper bracket 3 form a feeding unit, the negative pressure monitoring box 6 and the hot melt tank 7 form a discharging unit, the connecting hopper 2 is connected to the source machine of the high-temperature alkali sulfide hot melt material, and the exported high-temperature alkali sulfide hot melt material is transported to the inside of the hot melt material conveying main equipment 1. The hot melt material conveying main equipment 1 is driven by the frequency conversion motor 5 to rotate inside the two limit support rings 4, and the position between the connecting hopper 2 and the negative pressure monitoring box 6 is limited by the two limit support rings 4. The high-temperature alkali sulfide hot melt material is transported to the negative pressure monitoring box 6 and the hot melt tank 7 through the rotation of the hot melt material conveying main equipment 1, and then introduced into the next process through the export pipe connected to the lower side of the rear end of the hot melt tank 7, thereby realizing the transportation of the high-temperature alkali sulfide hot melt material.

[0035] Preferably, the hot melt conveying main device 1 is sealed with the connecting hopper 2 and the negative pressure monitoring box 6 by inner and outer sealing rings, and the position is limited by the inner and outer sealing rings. Two groups of inner and outer sealing rings are respectively fixedly connected to the outside of the rear end of the hot melt conveying main device 1 and the outside of the rear end of the connecting hopper 2. The two groups of inner and outer sealing rings are respectively located inside and outside the front end of the hot melt conveying main device 1 and inside and outside the front end of the negative pressure monitoring box 6. The connecting hopper 2 is made of high temperature resistant and corrosion resistant materials. A converter inner liner 16 is provided inside the hot melt conveying main device 1. A spiral pushing blade 17 is fixedly connected to the inner wall of the converter inner liner 16. The converter inner liner 16 and the pushing blade 17 are both made of nickel-based alloy. The hot melt conveying main device 1, the converter inner liner 16 and the pushing blade 17 form a conveying unit. The hot melt conveying main device 1 and the connecting hopper A fully sealed design is adopted between 2 and the negative pressure monitoring box 6, which can prevent the leakage of the high-temperature alkali sulfide hot melt during the transportation process, reduce the safety hazard of the high-temperature alkali sulfide hot melt to the operators and the pollution of the environment, and enable the high-temperature alkali sulfide hot melt to be transported stably, continuously and uninterruptedly, thereby improving production efficiency. At the same time, the high-temperature alkali sulfide hot melt is transported in a fully enclosed environment to avoid contact with the air and impurities in the air, thereby ensuring the quality of the high-temperature alkali sulfide hot melt during the transportation process. After the high-temperature alkali sulfide hot melt is introduced into the hot melt conveying main equipment 1, it can be pushed into the negative pressure monitoring box 6 through the pushing blades 17. The hot melt conveying main equipment 1, the connecting hopper 2, the converter liner 16 and the pushing blades 17 are all made of high temperature resistant and corrosion-resistant materials, which reduces the equipment failure rate, ensures the stable operation of the equipment, reduces the maintenance cost, and increases the service life of the equipment.

[0036] Preferably, the front end of the variable frequency motor 5 is connected to a gearbox 9 through a rotating shaft, a gear seat 10 is provided on the left side of the rear end of the gearbox 9, and the gear seat 10 is located on the front side of the lower end of the hot melt conveying main device 1, and is fixedly connected to the upper end of the frontmost support base 8 through a bolt assembly, and support gears 11 are rotatably connected to the inside of the left and right sides of the upper end of the gear seat 10, and a transmission gear 12 is rotatably connected to the inside of the center of the upper end of the gear seat 10, and the transmission gear 12 is rotatably connected to the gearbox 9 through a connecting shaft, the two support gears 11 and the transmission gear 12 are rollingly connected to the hot melt conveying main device 1 through a driven gear ring 13, and the driven gear ring 13 is fixedly connected to the outside of the front side of the hot melt conveying main device 1, and meshes with the two support gears 11 and the transmission gear 12, when the variable frequency motor 5 is connected to the hot melt conveying main device 1 During the driving process of the equipment 1, the frequency conversion motor 5, the gearbox 9 and the transmission gear 12 form a power unit. The frequency conversion motor 5 drives the transmission gear 12 to rotate through the gearbox 9. The transmission gear 12 drives the hot melt conveying main equipment 1 to rotate by meshing and rolling with the driven gear ring 13. The frequency conversion motor 5 can control the speed through the internally introduced current, and control the speed of the transmission gear 12 through the speed change of the gearbox 9, thereby controlling the speed of the hot melt conveying main equipment 1, and then controlling the transportation speed and flow rate of the high-temperature sulfide alkali hot melt. The two supporting gears 11 are located on both sides of the transmission gear 12 and supported at the lower end of the driven gear ring 13, which are used to stabilize the connection between the transmission gear 12 and the driven gear ring 13, prevent the hot melt conveying main equipment 1 and the driven gear ring 13 from being skewed, and ensure stable transmission.

[0037] Preferably, the two limit support rings 4 are clamped with the hot melt material conveying main device 1 through the limit clamping ring 14, and the two limit clamping rings 14 are fixedly connected to the outside of the rear side of the hot melt material conveying main device 1, and the limit support ring 4 is rotatably connected to a plurality of resistance reducing rollers 15, and the plurality of resistance reducing rollers 15 are rollingly connected to the outside of the limit clamping ring 14. During the rotation of the hot melt material conveying main device 1, the hot melt material conveying main device 1 can limit the rotation position through the limit support ring 4 and the limit clamping ring 14, and can reduce the rotational resistance through the plurality of resistance reducing rollers 15, which can reduce both energy consumption and wear between components.

[0038] Preferably, the front side of the upper end of the negative pressure monitoring box 6 is connected to a heat exchanger 18 through a connecting pipe, the rear side of the heat exchanger 18 is connected to an alkali liquid absorption tank 19 through a connecting pipe, and the alkali liquid absorption tank 19 is fixedly connected to the rear side of the upper end of the negative pressure monitoring box 6, and the rear side of the upper end of the alkali liquid absorption tank 19 is connected to an induced draft fan 20 through a connecting pipe, and a filter element is arranged inside the opening of the other end of the induced draft fan 20. When the high-temperature sulfide alkali hot melt is introduced into the negative pressure monitoring box 6, the heat exchanger 18, the alkali liquid absorption tank 19 and the induced draft fan 20 form a recovery unit, and the smoke inside the negative pressure monitoring box 6 is recovered by the suction of the induced draft fan 20. The smoke and part of the hot air are sucked into the heat exchanger 18, and then cooled by the heat exchanger 18. The cooled smoke is introduced into the alkali solution absorption tank 19 for solution filtration, and finally discharged into the air through the filter element inside the upper opening of the induced draft fan 20 for physical filtration, to ensure environmentally friendly emissions, while keeping the temperature inside the hot melt conveying main equipment 1, the negative pressure monitoring box 6 and the hot melt tank 7 stable.

[0039] Preferably, two monitoring sensors 21 are plugged into the rear end of the negative pressure monitoring box 6, and the two monitoring sensors 21 are connected to the frequency conversion motor 5, the gearbox 9 and the induced draft fan 20 through the regulating mechanism. The two monitoring sensors 21 located inside the rear end of the negative pressure monitoring box 6 are respectively used for temperature and flow monitoring of the high-temperature alkali sulfide hot melt. When the temperature of the high-temperature alkali sulfide hot melt is detected to be abnormal, the two monitoring sensors 21 and the air conditioning mechanism form a monitoring unit, and the speed is adjusted by adjusting the current of the frequency conversion motor 5 through the regulating mechanism, and the gearbox 9 is controlled to reduce the transmission ratio and the speed of the transmission gear 12, thereby reducing the speed of the hot melt conveying main equipment 1 and the transfer flow of the high-temperature alkali sulfide hot melt to prevent heat from accumulating too quickly. At the same time, the speed of the induced draft fan 20 is controlled by the regulating mechanism to increase the suction speed and the hot air carrying away speed, thereby controlling the temperature of the high-temperature alkali sulfide hot melt and preventing the temperature inside the hot melt conveying main equipment 1, the negative pressure monitoring box 6 and the hot melt tank 7 from being too high to affect the quality of the high-temperature alkali sulfide hot melt.

[0040] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A closed conveying device for high temperature (900℃-1200℃) alkali sulfide hot melt, characterized in that: The invention comprises a hot melt material conveying main device (1), wherein a connecting hopper (2) with an opening facing upward is clamped inside the center of the front end of the hot melt material conveying main device (1), and the rear end of the connecting hopper (2) is rotatably connected to the inside of the front end of the hot melt material conveying main device (1), the lower end of the connecting hopper (2) is fixedly connected to a hopper bracket (3), and two limit support rings (4) are sleeved on the rear side of the connecting hopper (2), a variable frequency motor (5) is arranged on the front side of the lower end of the hot melt material conveying main device (1), a negative pressure monitoring box (6) is arranged at the rear end of the hot melt material conveying main device (1), and the hot melt material conveying main device (1) is clamped inside the center of the front end of the negative pressure monitoring box (6) and is rotatably connected to the negative pressure monitoring box (6), the lower end of the negative pressure monitoring box (6) is connected to a hot melt tank (7), and the lower ends of the two limit support rings (4) and the variable frequency motor (5) are both provided with a support base (8), and are fixedly connected to the upper ends of three support bases (8) by a bolt assembly.

2. The closed conveying device for high temperature (900°C-1200°C) alkali sulfide hot melt material according to claim 1, characterized in that: The front end of the variable frequency motor (5) is connected to a gearbox (9) via a rotating shaft, and a gear seat (10) is provided on the left side of the rear end of the gearbox (9). The gear seat (10) is located at the front side of the lower end of the hot melt conveying main device (1) and is fixedly connected to the upper end of the frontmost support base (8) via a bolt assembly.

3. The closed conveying device for high temperature (900°C-1200°C) alkali sulfide hot melt material according to claim 2, characterized in that: Support gears (11) are rotatably connected to the left and right sides of the upper end of the gear seat (10), and a transmission gear (12) is rotatably connected to the center of the upper end of the gear seat (10), and the transmission gear (12) is rotatably connected to the gearbox (9) via a connecting shaft.

4. The closed conveying device for high temperature (900°C-1200°C) alkali sulfide hot melt material according to claim 3, characterized in that: The two supporting gears (11) and the transmission gear (12) are rollingly connected to the hot melt material conveying main device (1) via a driven gear ring (13), and the driven gear ring (13) is fixedly connected to the front outside of the hot melt material conveying main device (1) and meshes with the two supporting gears (11) and the transmission gear (12).

5. The closed conveying device for high temperature (900°C-1200°C) alkali sulfide hot melt material according to claim 1, characterized in that: The two limit support rings (4) are both clamped to the hot melt material conveying main device (1) through the limit clamp ring (14), and the two limit clamp rings (14) are fixedly connected to the outside of the rear side of the hot melt material conveying main device (1), and the limit support ring (4) is rotatably connected to a plurality of resistance reducing rollers (15), and the plurality of resistance reducing rollers (15) are rollingly connected to the outside of the limit clamp ring (14).

6. A closed conveying device for high temperature (900°C-1200°C) alkali sulfide hot melt according to claim 1, characterized in that: The hot melt conveying main device (1) is provided with a converter inner shell (16), and spiral pushing blades (17) are fixedly connected to the inner wall of the converter inner shell (16), and both the converter inner shell (16) and the pushing blades (17) are made of nickel-based alloy.

7. A closed conveying device for high temperature (900°C-1200°C) alkali sulfide hot melt according to claim 6, characterized in that: The hot melt material conveying main device (1) and the connecting hopper (2) and the negative pressure monitoring box (6) are sealed by inner and outer sealing rings, and the positions are limited by the inner and outer sealing rings. The two sets of inner and outer sealing rings are respectively fixedly connected to the outside of the rear end of the hot melt material conveying main device (1) and the outside of the rear end of the connecting hopper (2).

8. A closed conveying device for high temperature (900°C-1200°C) alkali sulfide hot melt according to claim 7, characterized in that: The two sets of inner and outer sealing rings are respectively located inside and outside the front end of the hot melt conveying main equipment (1) and inside and outside the front end of the negative pressure monitoring box (6), and the connecting hopper (2) is made of high temperature resistant and corrosion resistant materials.

9. The closed conveying device for high-temperature (900°C-1200°C) alkali sulfide hot melt according to claim 1, characterized in that: The front side of the upper end of the negative pressure monitoring box (6) is connected to a heat exchanger (18) via a connecting pipe, the rear side of the heat exchanger (18) is connected to an alkali solution absorption tank (19) via a connecting pipe, and the alkali solution absorption tank (19) is fixedly connected to the rear side of the upper end of the negative pressure monitoring box (6).

10. A closed conveying device for high temperature (900°C-1200°C) alkali sulfide hot melt material according to claim 9, characterized in that: The upper rear side of the alkali solution absorption tank (19) is connected to an induced draft fan (20) via a connecting pipe, and a filter element is arranged inside the opening of the other end of the induced draft fan (20). Two monitoring sensors (21) are plugged into the rear end of the negative pressure monitoring box (6), and the two monitoring sensors (21) are connected to the variable frequency motor (5), the gearbox (9) and the induced draft fan (20) via a control mechanism.

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