Coal chemical industry process waste gas desulfurization device

Abstract

The invention relates to the technical field of coal chemical industry, and discloses a coal chemical industry process waste gas desulfurization device which comprises a filter box and a gas inlet pipe, the gas inlet pipe is connected to one side of the filter box, a spraying device is arranged on one side of the filter box, and a filter device is arranged in the filter box; the filtering device comprises a treatment unit and a cleaning unit; the treatment unit comprises a track, a mounting frame, a first filter screen, a second filter screen, a connecting plate, a handle and a through groove, the track is fixedly mounted on the inner wall of the filter box, the mounting frame is arranged in the filter box, the first filter screen and the second filter screen are mounted on one side of the mounting frame, the connecting plate is fixedly mounted on one side of the mounting frame, and the handle is arranged in the through groove. And the handle is fixedly mounted on one side of the connecting plate. By arranging the cleanable two-stage filtering device before desulfurization, particulate matters in the waste gas are effectively removed and are prevented from interfering with the subsequent desulfurization reaction, so that the continuous, efficient and stable operation of the desulfurization process is ensured.

Description

Technical Field

[0001] This invention relates to the field of coal chemical technology, specifically to a desulfurization device for waste gas from coal chemical processes. Background Technology

[0002] Coal is a major raw material for many important chemical products. With the sustained and rapid development of the social economy, coal chemical industry has made breakthrough progress in the energy industry. However, the utilization of waste gas in the coal chemical industry still has significant shortcomings and deficiencies. Currently, most desulfurization gas purification equipment is not convenient for further purification during use and is generally directly discharged into the environment, resulting in poor purification effect and low utilization efficiency. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a desulfurization device for coal chemical process waste gas, which solves the problems of low desulfurization efficiency, unstable operation, and frequent maintenance caused by particulate matter in the waste gas clogging the system and insufficient gas-liquid contact in existing coal chemical waste gas desulfurization devices.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solution: a desulfurization device for waste gas from coal chemical processes, comprising a filter box and an inlet pipe, wherein the inlet pipe is connected to one side of the filter box, a spray device is provided on one side of the filter box, and a filter device is provided inside the filter box.

[0005] The filtration device includes a processing unit and a cleaning unit;

[0006] The processing unit includes a track, a mounting frame, a first filter screen, a second filter screen, a connecting plate, a handle, and a through groove. The track is fixedly installed on the inner wall of the filter box, the mounting frame is located inside the filter box, the first and second filter screens are installed on the inner side of the mounting frame, the connecting plate is fixedly installed on one side of the mounting frame, the handle is fixedly installed on one side of the connecting plate, and the through groove is opened on one side surface of the filter box.

[0007] Preferably, the cleaning unit includes a rotating hole, a rotating roller, and a cleaning brush. The rotating hole is formed on the inner wall of the filter box, the rotating roller is disposed inside the filter box, and the cleaning brush is installed on the outer wall of the rotating roller.

[0008] Preferably, the rotating roller is rotatably mounted inside the rotating hole via a bearing, the filter box is equipped with a motor, and the output end of the motor is connected to the rotating roller, and the outer end of the cleaning brush abuts against the outer wall of the first filter screen and the second filter screen.

[0009] Preferably, an air outlet is provided on the other side of the filter box, and an air pump is connected to the other side of the filter box. The air outlet and the air pump are connected by a pipe, and the air pump is connected to the spray box by a pipe.

[0010] Preferably, the spraying device includes a spray box, a blower, a connecting pipe, a connecting cover, a spray head, a connecting hose, a liquid outlet pipe, and a pipe cap. The spray box is located on the side of the filter box, the blower is installed on one side of the spray box, the connecting pipe is connected to the top of the blower, the connecting cover is installed at the other end of the connecting pipe, the spray head is installed at the top inside the spray box, the connecting hose is connected to the top of the spray head, the liquid outlet pipe is connected to the other side of the spray box, and the pipe cap is connected to the outer wall of the liquid outlet pipe.

[0011] Preferably, the connecting pipe passes through the spray box and is connected to the connecting cover, and the pipe cover is threaded to the outer wall of the liquid outlet pipe.

[0012] Preferably, the connecting end of the mounting frame is slidably connected to the outer wall of the track, and the end of the connecting plate is inserted into the inside of the through groove.

[0013] Preferably, a rotating shaft is fixedly installed on both sides of the first filter screen and the second filter screen, a sliding sleeve is fixedly installed on the inner side of the mounting frame, and one end of the rotating shaft extends into the interior of the sliding sleeve and is movably connected thereto. A torsion spring is provided inside the rotating shaft, and the two ends of the torsion spring are respectively connected to the mounting frame and the rotating shaft.

[0014] Preferably, the filter box has symmetrically installed fixing blocks inside, a stop rod is movably installed on the inner side of the fixing block, a pulley is movably installed at one end of the stop rod, a connecting rod is fixedly connected to one side of the stop rod, and a motor is also provided inside the filter box, with the output end of the motor connected to the connecting rod.

[0015] Preferably, the device further includes a PLC control system for receiving signals from the exhaust gas flow rate, SO2 concentration, and differential pressure sensor, and for controlling the start-up, shutdown, and speed of the air pump, blower, and motor.

[0016] Working principle: The sulfur-containing and particulate waste gas generated by the coal chemical process first enters the filter box through the inlet pipe. The waste gas passes through the first filter screen and the second filter screen in the filter box. The solid particles carried in the gas are effectively intercepted by the two-stage filter screen. At the same time, the motor drives the rotating roller to rotate, which drives the cleaning brush installed on it to continuously scrape the surface of the two-stage filter screen to prevent the accumulation of particles and blockage of the mesh, thereby keeping the filter channel unobstructed for a long time.

[0017] After being filtered and purified, the gas is drawn out through the outlet under the negative pressure generated by the air pump and transported to the spray box through the pipeline. Inside the spray box, the blower blows air into the box through the connecting pipe. The airflow is dispersed by the connecting cover to form turbulence, which is used to enhance the gas disturbance inside the box. At the same time, the desulfurization absorption liquid is transported to the spray head through the connecting hose and is atomized and sprayed downward.

[0018] The exhaust gas is thoroughly mixed and contacted with turbulent air and atomized absorbent liquid inside the spray box, where the sulfides it contains react chemically with the absorbent liquid and are removed. The purified gas is finally discharged from the system through the exhaust port at the top of the spray box. The waste liquid deposited at the bottom of the spray box can be discharged through the liquid outlet pipe by unscrewing the threaded pipe cap during equipment maintenance.

[0019] In addition, when the filter screen needs to be cleaned or replaced, the operator can pull the connecting plate outward by the handle outside the box, which will cause the mounting frame to slide out of the filter box along the track, thus realizing quick maintenance and reset of the filter unit;

[0020] After entering the desulfurization system, the exhaust gas first flows through a two-stage filter screen that can be deflected and adjusted. The filter screen is mounted on both sides within a slidable and fixed sleeve via a rotating shaft. A torsion spring is installed within the shaft, giving the filter screen an automatic reset function. When the system detects an increase in exhaust gas flow, a rise in particulate matter load, or an increase in filtration resistance, the control system starts the motor. The motor drives a connecting rod to rotate, which in turn pushes a retaining rod to swing. The pulley at the end of the retaining rod rolls and presses against the filter screen frame, forcing the filter screen to deflect around the rotating shaft at a certain angle. This angle adjustment changes the flow path and contact area of ​​the exhaust gas through the filter screen, thereby enhancing particulate matter interception capacity, reducing pressure drop, and adapting to different operating conditions. When the driving force is removed, the torsion spring releases its elastic energy, causing the filter screen to automatically reset to its initial vertical state.

[0021] The entire process is intelligently coordinated by an integrated PLC control system. The system collects key parameters in real time, such as exhaust gas flow rate, sulfur dioxide concentration, and pressure difference before and after the filter. Based on this data, it dynamically adjusts the induced draft of the extraction pump, the airflow disturbance intensity of the blower, and the drive motor for the filter deflection angle. Through multi-parameter closed-loop control, the system continuously optimizes the desulfurization process, ensuring desulfurization efficiency while reducing energy consumption, minimizing filter clogging, and extending maintenance cycles, ultimately achieving the goal of efficient, stable, and adaptive exhaust gas purification.

[0022] This invention provides a desulfurization device for waste gas from coal chemical processes. It has the following beneficial effects:

[0023] 1. This invention effectively removes particulate matter from the exhaust gas by setting up a cleanable two-stage filtration device before desulfurization, thus preventing it from interfering with the subsequent desulfurization reaction and ensuring the continuous, efficient and stable operation of the desulfurization process.

[0024] 2. This invention uses a rotating roller to drive a cleaning brush to rotate and clean the first and second filter screens, preventing particulate matter from clogging the mesh, extending the service life of the filter screens, reducing the frequency of downtime for cleaning or replacement, and improving the continuous operation capability of the equipment.

[0025] 3. The present invention has a blower and a connecting cover structure in the spray box, which can enhance the turbulent mixing of waste gas and spray absorption liquid, improve mass transfer efficiency, make the desulfurization reaction more complete, and further reduce the sulfide content in the waste gas.

[0026] 4. The filter screen of this invention adopts a sliding connection between the mounting frame and the track, and with the front handle and through groove, it can be quickly pulled out and replaced, simplifying maintenance operations and reducing operation and maintenance costs.

[0027] 5. The filter unit and spray unit of this invention are compactly connected, and the gas is transported in a directional manner through an air pump. The overall energy consumption is low, and the emissions of particulate matter and sulfides are effectively reduced, thus mitigating secondary pollution to the environment. Attached Figure Description

[0028] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0029] Figure 2 This is a side view of the structure of the present invention;

[0030] Figure 3 This is a schematic diagram of the internal structure of the spray box of the present invention;

[0031] Figure 4 This is a schematic diagram of the internal structure of the filter box of the present invention;

[0032] Figure 5 This is a schematic diagram of the mounting frame structure of the present invention;

[0033] Figure 6 This is a schematic diagram of the through-slot location structure of the present invention;

[0034] Figure 7 This is a schematic diagram of the shaft position structure of the present invention;

[0035] Figure 8 This is a schematic diagram of the torsion spring position structure of the present invention;

[0036] Figure 9 This is a schematic diagram of the abutment position structure of the present invention;

[0037] Figure 10 This is a schematic diagram of the control system workflow of the present invention.

[0038] The components include: 1. Filter box; 2. Air inlet pipe; 3. Air outlet; 4. Air pump; 5. Spraying device; 501. Spray box; 502. Blower; 503. Connecting pipe; 504. Connecting cover; 505. Spray head; 506. Connecting hose; 507. Liquid outlet pipe; 508. Pipe cover; 6. Filtering device; 601. Rotating hole; 602. Rotating roller; 603. Cleaning brush; 604. Track; 605. Mounting frame; 606. First filter screen; 607. Second filter screen; 608. Connecting plate; 609. Handle; 610. Through groove; 611. Rotating shaft; 612. Sliding sleeve; 613. Torsion spring; 7. Fixing block; 701. Connecting rod; 8. Support rod; 801. Pulley. Detailed Implementation

[0039] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] Please see the appendix Figure 1 -Appendix Figure 10 This invention provides a desulfurization device for coal chemical process waste gas, including a filter box 1 and an air inlet pipe 2. The air inlet pipe 2 is connected to one side of the filter box 1. A spray device 5 is provided on one side of the filter box 1, and a filter device 6 is provided inside the filter box 1.

[0041] The filter device 6 includes a processing unit and a cleaning unit;

[0042] The processing unit includes a track 604, a mounting frame 605, a first filter screen 606, a second filter screen 607, a connecting plate 608, a handle 609, and a through groove 610. The track 604 is fixedly installed on the inner wall of the filter box 1. The mounting frame 605 is located inside the filter box 1. The first filter screen 606 and the second filter screen 607 are installed on the inner side of the mounting frame 605. The connecting plate 608 is fixedly installed on the front of the mounting frame 605. The handle 609 is fixedly installed on the front of the connecting plate 608. The through groove 610 is opened on the front of the filter box 1.

[0043] Specifically, the processing unit is used to intercept and filter particulate matter in the exhaust gas. The processing unit includes a track 604, a mounting frame 605, a first filter screen 606, a second filter screen 607, a connecting plate 608, a handle 609, and a through groove 610. Two tracks 604 are fixedly installed on the upper and lower sides of the inner wall of the filter box 1, respectively. The mounting frame 605 is located inside the filter box 1, with its two sides slidably connected to the tracks 604, allowing the mounting frame 605 to be pushed into or pulled out of the filter box 1 along the tracks 604. The first filter screen 606 and the second filter screen 607 are installed side-by-side on the inner side of the mounting frame 605 for graded filtration of particulate matter in the exhaust gas. The connecting plate 608 is fixedly installed on the front of the mounting frame 605. The handle 609 is fixedly installed on the front of the connecting plate 608. The through groove 610 is opened on the front of the filter box 1, with the end of the connecting plate 608 inserted into the through groove 610 and placed inside the filter box 1, and one side of the connecting plate 608 extending out of the filter box 1. By pulling the handle 609 outward, the connecting plate 608 and the mounting frame 605 can be slid along the track 604, thereby pulling the mounting frame 605 together with the first filter screen 606 and the second filter screen 607 out of the filter box 1 for easy replacement or cleaning.

[0044] Furthermore, the cleaning unit includes a rotating hole 601, a rotating roller 602, and a cleaning brush 603. The rotating hole 601 is opened in the inner wall of the filter box 1, the rotating roller 602 is disposed inside the filter box 1, and the cleaning brush 603 is installed on the outer wall of the rotating roller 602. The rotating roller 602 is rotatably installed inside the rotating hole 601 through a bearing. A motor is provided inside the filter box 1, and the output end of the motor is connected to the rotating roller 602. The outer end of the cleaning brush 603 abuts against the outer wall of the first filter screen 606 and the second filter screen 607.

[0045] Specifically, there are two rotating holes 601, symmetrically arranged on the upper and lower inner walls of the filter box 1. The rotating roller 602 is horizontally positioned inside the filter box 1, with its two ends rotatably mounted in the two rotating holes 601 via bearings. A motor is installed inside the filter box 1, and the motor's output shaft passes through the side wall of the filter box 1 and is coaxially connected to one end of the rotating roller 602. A cleaning brush 603 is fixedly mounted on the outer wall of the rotating roller 602 along its axial direction. The outer ends of the bristles of the cleaning brush 603 maintain contact with the surfaces of the first filter screen 606 and the second filter screen 607, respectively.

[0046] When the motor drives the roller 602 to rotate around its axis, the cleaning brush 603 rotates synchronously. During rotation, the bristles of the cleaning brush 603 continuously scrape the surfaces of the first filter screen 606 and the second filter screen 607, thereby peeling off and sweeping away particles attached to them. This effectively prevents particles from clogging the mesh of the first filter screen 606 and the second filter screen 607, ensuring the continuous unobstructed flow and filtration efficiency of the filtration device 6.

[0047] Furthermore, an air outlet 3 is provided on the other side of the filter box 1, and an air pump 4 is connected to the other side of the filter box 1. The air outlet 3 and the air pump 4 are connected by a pipe, and the air pump 4 is connected to the spray box 501 by a pipe.

[0048] Specifically, an air outlet 3 is provided on the opposite side wall of the filter box 1, opposite to the air inlet pipe 2. An air pump 4 is fixedly installed on the outer wall of this side of the filter box 1, and the air outlet 3 is sealed to the air inlet of the air pump 4 through a first pipe. The air outlet of the air pump 4 is sealed to the air inlet of the spray box 501 through a second pipe.

[0049] When the vacuum pump 4 is running, a negative pressure is created inside the filter box 1, causing the exhaust gas, after being filtered by the first filter screen 606 and the second filter screen 607, to flow out through the outlet 3 and enter the vacuum pump 4 through the first pipe. Subsequently, the vacuum pump 4 pressurizes the exhaust gas and continuously delivers it to the interior of the spray box 501 through the second pipe, providing a gas source guarantee for the subsequent spray desulfurization process.

[0050] Furthermore, the spraying device 5 includes a spray box 501, a blower 502, a connecting pipe 503, a connecting cover 504, a spray head 505, a connecting hose 506, a liquid outlet pipe 507, and a pipe cover 508. The spray box 501 is located on the side of the filter box 1. The blower 502 is installed on one side of the spray box 501. The connecting pipe 503 is connected to the top of the blower 502. The connecting cover 504 is installed at the other end of the connecting pipe 503. The spray head 505 is installed at the top inside of the spray box 501. The connecting hose 506 is connected to the top of the spray head 505. The liquid outlet pipe 507 is connected to the other side of the spray box 501. The pipe cover 508 is connected to the outer wall of the liquid outlet pipe 507.

[0051] Specifically, the spray box 501 is a sealed box, fixedly installed on the side of the filter box 1. The air inlet of the spray box 501 is connected to the air outlet of the air pump 4 through a second pipe, and the blower 502 is fixedly installed on the outer wall of one side of the spray box 501. The connecting pipe 503 is a rigid pipe, one end of which is connected to the air outlet of the blower 502, and the other end passes through the side wall of the spray box 501 and extends into the interior of the spray box 501. The connecting cover 504 is fixedly installed at the end of the connecting pipe 503 located inside the spray box 501. The connecting cover 504 has airflow holes to disperse the high-speed airflow sent in by the blower 502.

[0052] Spray head 505 is fixedly installed at the top inside spray box 501. One end of connecting hose 506 is connected to the external desulfurization absorption liquid supply system, and the other end is connected to the inlet of spray head 505. Discharge pipe 507 is connected to the bottom of the other side of spray box 501. Pipe cover 508 is threadedly sealed to the outer wall of discharge pipe 507 to seal it. The top surface of spray box 501 is provided with an exhaust port for discharging purified gas, and the exhaust port has a valve inside for controlling its opening and closing.

[0053] During operation, blower 502 continuously blows air into the spray box 501 through connecting pipe 503, which is dispersed by connecting cover 504 to form a turbulent airflow. Simultaneously, desulfurization absorbent is transported to spray head 505 through connecting hose 506 and atomized and sprayed downwards from spray head 505. The exhaust gas from filter box 1 is fully mixed and contacted with the turbulent airflow and atomized absorbent in the spray box 501, completing the desulfurization reaction. The purified gas after the reaction is discharged from the exhaust port at the top of the spray box 501, while the waste liquid settles at the bottom of the spray box 501 and can be discharged through the liquid outlet pipe 507 by unscrewing the pipe cover 508 after shutdown.

[0054] Furthermore, the connecting pipe 503 passes through the spray box 501 and is connected to the connecting cover 504, and the pipe cover 508 is threadedly connected to the outer wall of the liquid outlet pipe 507.

[0055] Specifically, the connecting pipe 503 penetrates the side wall of the spray box 501, and its end inside the spray box 501 is fixedly connected to the connecting cover 504. The penetration point of the connecting pipe 503 into the side wall of the spray box 501 is sealed to prevent gas leakage.

[0056] The inner wall of the pipe cap 508 is provided with internal threads, and the outer wall of the outlet pipe 507 is provided with matching external threads. The pipe cap 508 is connected to the outer wall of the outlet pipe 507 by threaded engagement. When the pipe cap 508 is tightened, its end washer presses against the end face of the outlet pipe 507 to seal, thereby closing the passage of the outlet pipe 507. When it is necessary to discharge the waste liquid in the spray box 501, the pipe cap 508 can be rotated in the opposite direction to separate it from the outlet pipe 507 and open the drainage channel.

[0057] Furthermore, the connecting end of the mounting frame 605 is slidably connected to the outer wall of the track 604, and the end of the connecting plate 608 is inserted into the inside of the through groove 610.

[0058] Specifically, the upper and lower connecting ends of the mounting frame 605 are respectively provided with sliding grooves that are adapted to the cross-sectional shape of the track 604. The two tracks 604 are respectively fixedly installed on the upper and lower sides of the inner wall of the filter box 1. The mounting frame 605 spans and engages with the two tracks 604 through the sliding grooves on both sides, so that the mounting frame 605 can slide back and forth along the length of the track 604;

[0059] When maintenance or replacement of the first filter screen 606 and the second filter screen 607 is required, the operator can pull the connecting plate 608 outward using the handle 609, thereby causing the mounting frame 605 to slide along the track 604 outward from the filter box 1 until the mounting frame 605, along with the first filter screen 606 and the second filter screen 607 on it, is completely removed from the filter box 1. After maintenance is completed, the mounting frame 605 can be pushed back to its original working position inside the filter box 1 along the track 604.

[0060] The end of the connecting plate 608 passes through the through groove 610 and extends to the outside of the filter box 1. The width of the connecting plate 608 matches the width of the through groove 610, allowing the connecting plate 608 to slide freely along its length inside the through groove 610, while the through groove 610 limits the vertical movement of the connecting plate 608. A handle 609 is fixedly installed on the end of the connecting plate 608 located outside the filter box 1.

[0061] With this structure, the operator can directly operate the handle 609 from outside the filter box 1, thereby moving the connecting plate 608 and the mounting frame 605 fixedly connected to it along the track 604. When the mounting frame 605 is in the working position fully pushed into the filter box 1, the outer surface of the connecting plate 608 is basically flush with the outer wall of the filter box 1, resulting in a compact structure.

[0062] To further optimize the filtration effect and adapt to the exhaust gas treatment needs of different operating conditions, this embodiment expands the function of the processing unit of the filter device 6 by adding a filter screen deflection angle adjustment mechanism. This mechanism is integrated inside the mounting frame 605 and can dynamically adjust the tilt angle of the first filter screen 606 and the second filter screen 607 during operation, thereby changing the airflow distribution and contact area when exhaust gas passes through the filter screen, improving the particulate matter interception efficiency, and automatically resetting when not adjusted.

[0063] Furthermore, a rotating shaft 611 is fixedly installed on both sides of the first filter screen 606 and the second filter screen 607, and a sliding sleeve 612 is fixedly installed on the inner side of the mounting frame 605. One end of the rotating shaft 611 extends into the interior of the sliding sleeve 612 and is movably connected thereto. A torsion spring 613 is provided inside the rotating shaft 611, and both ends of the torsion spring 613 are connected to the mounting frame 605 and the rotating shaft 611, respectively.

[0064] Specifically, both the first filter screen 606 and the second filter screen 607 are rectangular frame structures, with symmetrically fixed rotating shafts 611 on the outer walls of their upper and lower side frames. Each rotating shaft 611 extends horizontally, and its axis is perpendicular to the plane of the filter screen.

[0065] On the upper and lower inner sidewalls of the mounting frame 605, a sliding sleeve 612 is fixedly installed at the position corresponding to each rotating shaft 611. The sliding sleeve 612 is a cylindrical component, with its inner diameter slightly larger than the outer diameter of the rotating shaft 611, and the two are clearance-fitted. The end of the rotating shaft 611 is inserted into the interior of the corresponding sliding sleeve 612 and can rotate around its own axis within the sliding sleeve 612, thereby realizing the deflection movement of the filter screen relative to the mounting frame 605;

[0066] To provide an automatic reset function after the filter screen deflects, an axial mounting cavity is provided inside each rotating shaft 611, and a torsion spring 613 is installed in the mounting cavity. One end of the torsion spring 613 is fixedly connected to the side wall of the mounting frame 605 via a slot or pin, and the other end is fixedly connected to the inner wall of the rotating shaft 611. When the filter screen deflects under the action of an external force, the rotating shaft 611 rotates accordingly and torsional the torsion spring 613, which accumulates elastic potential energy. When the external force is removed, the torsion spring 613 releases its potential energy, driving the rotating shaft 611 to rotate in the opposite direction, thereby causing the filter screen to automatically spring back to its initial vertical position. Preferably, the torsion spring 613 is made of high-temperature resistant and corrosion-resistant SUS316 stainless steel to adapt to the high-temperature and corrosive environment of coal chemical waste gas.

[0067] Furthermore, a fixing block 7 is symmetrically installed inside the filter box 1, and a stop rod 8 is movably installed on the inner side of the fixing block 7. A pulley 801 is movably installed on one end of the stop rod 8, and a connecting rod 701 is fixedly connected to one side of the stop rod 8. A motor is also provided inside the filter box 1, and the output end of the motor is connected to the connecting rod 701.

[0068] Specifically, a pair of fixing blocks 7 are symmetrically fixedly installed on the inner bottom wall of the filter box 1. The fixing blocks 7 are preferably made of metal, such as Q235 steel or 304 stainless steel, and are firmly installed on the inner wall of the filter box 1 by welding or bolting. Each fixing block 7 has a through hole in the center, and a bearing, such as a deep groove ball bearing, is installed in the hole to support the installation of the support rod 8;

[0069] The abutment rod 8 is a rigid rod. Its end near the fixed block 7 is movably connected to the fixed block 7 via a bearing, allowing the abutment rod 8 to swing freely in a vertical plane around this connection point. The other end of the abutment rod 8, the end furthest from the fixed block 7, has a mounting groove in which a pulley 801 is movably mounted via a pin. The pulley 801 is preferably made of a wear-resistant material, such as polytetrafluoroethylene, nylon, or a surface-hardened metal wheel, and its outer circumference is arc-shaped to reduce stress concentration when in contact with the filter screen frame. The pulley 801 can rotate freely around its pin, achieving rolling contact with the filter screen frame.

[0070] A connecting rod 701 is vertically fixed to one end of the abutment rod 8. The other end of the connecting rod 701 is fixedly connected to the output shaft of a drive motor. The motor is preferably a stepper motor or a servo motor, which is fixed to the internal support of the filter box 1 by a motor mounting bracket. The output shaft of the motor extends horizontally and passes through the sealed bearing seat on the side wall of the filter box 1 into the interior of the box. It is connected to the end of the connecting rod 701 by a coupling or keyway to ensure concentricity and sealing of power transmission.

[0071] To adapt to the corrosive gas environment that may exist inside the filter box 1, the surfaces of metal parts such as the fixing block 7, the push rod 8, the connecting rod 701, and the pin of the pulley 801 can be treated with anti-corrosion measures, such as galvanizing, coating with epoxy resin, or being made of stainless steel as a whole.

[0072] Furthermore, the device also includes a PLC control system, which receives signals from the exhaust gas flow rate, SO2 concentration, and differential pressure sensor, and controls the start-up, shutdown, and speed of the air pump 4, blower 502, and motor.

[0073] Specifically, the PLC control system includes at least a central processing unit, preferably an industrial-grade PLC; an analog input module for receiving continuous signals from various sensors; a digital output module for controlling the start, stop, and speed regulation of actuators such as motors, pumps, and fans; a human-machine interface, optionally equipped with a touch screen, for parameter setting, status display, and alarm management; and a communication module supporting Ethernet, PROFIBUS, or Modbus protocols for data interaction with a host computer or factory central control system.

[0074] A waste gas flow sensor is installed near the inlet pipe 2 of the filter box 1 to monitor the volumetric flow rate of the waste gas entering the system in real time. Differential pressure sensors are installed inside the filter box 1, on the front and rear sides of the first filter screen 606 and the second filter screen 607, respectively, to monitor the degree of filter clogging. An SO2 concentration sensor, such as an ultraviolet fluorescence sensor or an electrochemical sensor, is installed at the outlet or exhaust pipe of the spray box 501 to monitor the residual SO2 concentration in the desulfurized gas. Additionally, a pH sensor may optionally be installed inside the spray box 501 to monitor the acidity or alkalinity of the absorbent liquid.

[0075] Based on the sensor signals mentioned above, the PLC control system executes the following control strategy: When the differential pressure sensor detects that the pressure difference across the filter exceeds the first set threshold, such as 200Pa, the PLC first starts the cleaning motor in the cleaning unit, driving the cleaning brush 603 to rotate and automatically clean the filter. If the pressure difference continues to rise after cleaning and exceeds the second set threshold, such as 400Pa, the PLC determines that the filter is severely clogged. At this time, the adjustment motor is started, pushing the filter to deflect at a certain angle, such as 15°, through the connecting rod 701 and the stop rod 8, to increase the effective filtration area and reduce airflow resistance. The deflection angle can be adjusted by PID according to the rate of change of pressure difference. When the pressure difference returns to the normal range, the PLC controls the adjustment motor to reverse, causing the filter to reset under the action of the torsion spring 613, and stops the cleaning motor.

[0076] The PLC dynamically adjusts the speed of the suction pump 4 based on the signal from the exhaust gas flow sensor to match the suction capacity with the actual intake volume, thus preventing excessive or insufficient negative pressure in the filter box 1. Simultaneously, based on feedback from the SO2 concentration sensor, the PLC adjusts the speed of the blower 502: when the SO2 concentration is too high, the speed of the blower 502 is increased to enhance the gas-liquid turbulent mixing intensity in the spray box 501; when the concentration meets the standard and is stable, the speed is reduced to save energy.

[0077] The spray box 501 is equipped with a pH sensor. The PLC can control the start and stop of the absorbent supply pump according to the pH value to maintain the activity of the absorbent. The spray volume of the spray head 505 can be controlled by an electric regulating valve connected to the PLC. The spray frequency can be proportionally linked with the exhaust gas flow rate.

[0078] The PLC system also has the following safety and maintenance assistance functions: when the current of the air pump 4, blower 502, or regulating motor is abnormal, the PLC will automatically stop and alarm; the system records the filter pressure difference growth trend and cleaning frequency, and when the replacement threshold is reached, it will prompt maintenance information through the HMI screen; the PLC can store key operating data, such as daily desulfurization efficiency and energy consumption curves, and upload them to the cloud or central control room through the communication module, supporting remote monitoring and big data analysis.

[0079] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A coal chemical process waste gas desulfurization device, comprising a filter box (1) and an air inlet pipe (2), the air inlet pipe (2) is connected to one side of the filter box (1), characterized in that: One side of the filter box (1) is provided with a spraying device (5), and the inside of the filter box (1) is provided with a filtering device (6); The filtering device (6) comprises a processing unit and a cleaning unit; The processing unit comprises a track (604), a mounting frame (605), a first filter screen (606), a second filter screen (607), a connecting plate (608), a handle (609) and a through slot (610), the track (604) is fixedly installed on the inner wall of the filter box (1), the mounting frame (605) is arranged in the inside of the filter box (1), the first filter screen (606) and the second filter screen (607) are installed on the inner side of the mounting frame (605), the connecting plate (608) is fixedly installed on one side of the mounting frame (605), the handle (609) is fixedly installed on one side of the connecting plate (608), and the through slot (610) is arranged on the side surface of the filter box (1).

2. The coal chemical process off-gas desulfurization device according to claim 1, characterized in that: The cleaning unit comprises a rotating hole (601), a rotating roller (602) and a cleaning brush (603), the rotating hole (601) is arranged on the inner wall of the filter box (1), the rotating roller (602) is arranged in the inside of the filter box (1), and the cleaning brush (603) is installed on the outer wall of the rotating roller (602).

3. The coal chemical process off-gas desulfurization device according to claim 2, characterized in that: The rotating roller (602) is rotatably installed in the rotating hole (601) through a bearing, a motor is arranged in the inside of the filter box (1), an output end of the motor is connected with the rotating roller (602), and the outer end of the cleaning brush (603) abuts against the outer walls of the first filter screen (606) and the second filter screen (607).

4. The coal chemical process off-gas desulfurization device according to claim 1, characterized in that: The other side of the filter box (1) is provided with an air outlet (3), the other side of the filter box (1) is connected with a suction pump (4), the air outlet (3) and the suction pump (4) are connected through a pipeline, and the suction pump (4) is connected with the spraying box (501) through the pipeline.

5. The coal chemical process off-gas desulfurization device according to claim 1, characterized in that: The spraying device (5) comprises a spraying box (501), a blower (502), a connecting pipe (503), a connecting cover (504), a spraying head (505), a connecting hose (506), a liquid outlet pipe (507) and a pipe cover (508), the spraying box (501) is arranged on the side of the filter box (1), the blower (502) is installed on one side of the spraying box (501), the connecting pipe (503) is connected to the top end of the blower (502), the connecting cover (504) is installed on the other end of the connecting pipe (503), the spraying head (505) is installed on the inner top end of the spraying box (501), the connecting hose (506) is connected to the top end of the spraying head (505), the liquid outlet pipe (507) is connected to the other side of the spraying box (501), and the pipe cover (508) is connected to the outer wall of the liquid outlet pipe (507).

6. The coal chemical process off-gas desulfurization device according to claim 5, characterized in that: The connecting pipe (503) penetrates through the spraying box (501) and is connected with the connecting cover (504), and the pipe cover (508) is threadedly connected with the outer wall of the liquid outlet pipe (507).

7. The coal chemical process off-gas desulfurization device according to claim 1, characterized in that: The connecting end of the mounting frame (605) is slidably connected with the outer wall of the track (604), and the end portion of the connecting plate (608) is inserted into the inside of the through slot (610).

8. The coal chemical process off-gas desulfurization device according to claim 1, characterized in that: Both sides of the first filter screen (606) and the second filter screen (607) are fixedly provided with rotating shafts (611), the inner side of the mounting frame (605) is fixedly provided with a sliding sleeve (612), one end of the rotating shaft (611) extends into the sliding sleeve (612) and is movably connected with the sliding sleeve (612), the inside of the rotating shaft (611) is provided with a torsional spring (613), and both ends of the torsional spring (613) are connected with the mounting frame (605) and the rotating shaft (611) respectively.

9. The coal chemical process off-gas desulfurization device according to claim 1, characterized in that: The inside of the filter box (1) is symmetrically provided with a fixed block (7), the inner side of the fixed block (7) is movably provided with an abutting rod (8), one end of the abutting rod (8) is movably provided with a pulley (801), one side of the abutting rod (8) is fixedly connected with a connecting rod (701), and the inside of the filter box (1) is further provided with a motor, and the output end of the motor is connected with the connecting rod (701).

10. The coal chemical process waste gas desulfurization device according to claim 1, characterized in that: The device further comprises a PLC control system for receiving signals of waste gas flow, SO2 concentration, and pressure difference sensor, and controlling start-stop and rotating speed of the air pump (4), the air blower (502), and the motor.

Images