A coal-fired power plant coal sample preparation chamber trench type underground pipe dust removal system

Abstract

The application discloses a coal-fired sample preparation chamber trench type underground pipe dust removal system suitable for thermal power generation, which comprises a dust removal host, a trench type underground pipe pipeline system, a multi-point dust source control device and an automatic control system, and is provided with a cleaning device in a matching mode; the multi-point dust source control device is adapted to coal-fired sample preparation chamber stacking and mixing, equipment interior and operation table operation dust sources, and comprises a stacking and mixing dust source control device, an interior dust source control device and an operation table dust source control device; through the collaborative design of the trench type underground pipe pipeline system and the multi-point dust source control device, the PVC main pipeline is buried in a trench, the sample preparation operation space is not occupied, the pipeline sealing connection is realized through flange connection ends, the stainless steel V-shaped fence dust suction air port and the equipment butt joint type dust source control structure are matched, the precise and closed collection of the multi-point dust sources such as the coal-fired sample preparation chamber stacking and mixing, the equipment interior and the operation table is realized, and the problems of the existing technology that the dust source collection is not comprehensive and the dust is prone to leakage are solved.

Description

Technical Field

[0001] This invention relates to the field of dust removal technology, specifically to a trench-type underground pipe dust removal system suitable for coal-fired sample preparation chambers in thermal power generation. Background Technology

[0002] Currently, dust control in coal-fired power plant sample preparation rooms mainly uses mobile dust collection equipment and top-suction centralized dust collection systems, but both have significant technical drawbacks. Mobile dust collection equipment requires manual movement, has poor adaptability, cannot simultaneously collect dust at multiple points, occupies sample preparation space, affects process flow, and has low dust collection efficiency, making it difficult to meet purification requirements. Top-suction centralized dust collection systems capture dust through roof ducts, which are cluttered and space-consuming, have poor collection effect on low-level dust sources, and cannot accurately capture dust. In addition, existing dust collection systems have simple control methods and low levels of intelligence, relying mostly on manual control, and cannot dynamically adjust airflow according to dust concentration, easily leading to high energy consumption or substandard performance. They also lack fault monitoring and alarm mechanisms, failing to promptly alert to equipment failures or excessive dust levels, affecting system stability and making them unsuitable for continuous operation. Furthermore, existing dust collection systems have poor duct sealing, are prone to leakage, and exposed duct layouts are prone to dust accumulation and blockage, making later maintenance difficult. After long-term use, dust collection efficiency drops significantly, making them unsuitable for long-term high-dust, multi-point operation. Summary of the Invention

[0003] Therefore, the present invention provides a trench-type underground pipe dust removal system for coal-fired sample preparation chambers in thermal power generation, in order to overcome the problems of the prior art.

[0004] This invention is implemented by the following technical solution:

[0005] A trench-type underground pipe dust removal system suitable for coal-fired sample preparation chambers in thermal power generation includes a dust removal host, a trench-type underground pipe system, a multi-point dust source control device and an automatic control system, and is equipped with a cleaning device.

[0006] The multi-point dust source control device is adapted to dust sources in coal sample preparation room, equipment interior, and operating table, including a dust source control device for coal sample preparation, an internal dust source control device, and an operating table dust source control device.

[0007] The dust removal host is connected to each dust source control device through a trench-type underground pipe system to form a closed dust conveying channel, thereby achieving efficient dust collection and conveying at each point of coal combustion sample preparation.

[0008] The automatic control system is based on a PLC controller and is electrically connected to the dust removal host and various dust source control devices to achieve system-wide linkage control.

[0009] The dust removal host integrates a vortex fan, a filter, a back-blowing device, a dust collection device, and an air inlet. The air inlet is connected to a trench-type concealed pipe system. The vortex fan provides negative pressure power, the filter completes dust purification, the back-blowing device is set correspondingly to the filter, and the dust collection device is located below the filter.

[0010] Preferably, the trench-type concealed pipe system includes a PVC main pipe, a T-type tee joint, a flange connection end, a cleaning port, and a trench fixing seat; the PVC main pipe is buried in the trench of the coal-fired sample preparation room through the trench fixing seat, and branches to various dust source control devices through the T-type tee joint. Each connection part is sealed by the flange connection end. The cleaning port is set at intervals on the PVC main pipe. The cleaning device is used in conjunction with the cleaning port to prevent dust leakage and facilitate pipe cleaning.

[0011] Preferably, the dust source control device includes a lifting cylinder, a stainless steel V-shaped grid dust collection inlet, and a trench cover; the stainless steel V-shaped grid dust collection inlet is connected to the PVC main pipe, the lifting cylinder is driven to the stainless steel V-shaped grid dust collection inlet, adapting to the dust collection needs of coal piles at different heights, and the trench cover covers the stainless steel V-shaped grid dust collection inlet.

[0012] Preferably, the internal dust source control device includes an equipment connection flange, a frame, a dust settling filter frame, a cylinder, an exhaust port sealing plate, a pipe connection flange, and a solenoid valve; the equipment connection flange is connected to the coal-fired sample preparation equipment, the dust settling filter frame is fixed between the equipment connection flange and the pipe connection flange through the frame, the pipe connection flange is connected to the PVC main pipe, the solenoid valve is electrically connected to the cylinder, the cylinder piston rod is connected to the exhaust port sealing plate, and the control device is opened and closed to reduce the dust load entering the main pipe.

[0013] Preferably, the dust source control device for the operating table includes a dust suction vent, a protective frame, and a control button; the dust suction vent is connected to the PVC main pipe and faces the operating area of ​​the operating table, the protective frame is located outside the dust suction vent, and the control button is electrically connected to the automatic control system to realize the start and stop control nearby.

[0014] Preferably, the automatic control system further includes a remote control knob, a local control button, and a PLC expansion module; the remote control knob and the local control button are electrically connected to the input terminal of the PLC controller, and the PLC expansion module is connected to the PLC controller and expands the I / O interface to adapt to the control requirements of multiple components in coal sample preparation.

[0015] Preferably, the automatic control system further includes a power control module, a signal amplification module, and an intermediate relay; the power control module is electrically connected to the PLC controller to supply power to the system and integrates contactors, leakage protection devices, and thermal relays to achieve overload and leakage protection; the output terminal of the PLC controller is electrically connected to the dust collector control module and the air volume control execution component via the signal amplification module and the intermediate relay to drive both of them to work.

[0016] Preferably, the dust collector control module is electrically connected to the pulse controller and the dust collector execution end, respectively. The pulse controller is electrically connected to the back-blowing device and controls its cleaning frequency. The dust collector execution end is electrically connected to the vortex fan and controls its start-up, shutdown, and speed adjustment. The air volume control execution component is electrically connected to the execution end of the external dust source control device and the execution end of the internal dust source control device, respectively. The execution end of the external dust source control device is electrically connected to the dust source control device for stockpiling and the dust source control device for the operating platform. The execution end of the internal dust source control device is electrically connected to the internal dust source control device, respectively controlling the operation of each dust source device.

[0017] Preferably, the automatic control system is further provided with a status signal feedback module, which is electrically connected to the PLC controller, collects the working status signals of the dust removal host and each dust source control device, and feeds them back to the PLC controller to facilitate fault diagnosis.

[0018] Preferably, the system also includes a dust concentration intelligent monitoring and airflow adaptive adjustment module. This module comprises a dust concentration acquisition unit, an airflow adaptive execution unit, a display and setting unit, and a fault alarm unit. The dust concentration acquisition unit is installed at the dust source and inside the PVC main pipe, acquiring dust concentration signals and transmitting them to the PLC controller. The airflow adaptive execution unit, display and setting unit, and fault alarm unit are all electrically connected to the PLC controller. The display and setting unit displays concentration data and sets system parameters. The airflow adaptive execution unit adjusts the vortex fan speed and damper opening according to PLC controller instructions. The fault alarm unit receives alarm signals from the PLC controller and provides audible and visual alerts, indicating scenarios including dust concentration exceeding limits and sensor malfunction.

[0019] Advantages of this invention:

[0020] Through the coordinated design of the underground pipe system and the multi-point dust source control device, the PVC main pipe is buried in the trench, which does not occupy the sample preparation space. The flange connection ends achieve a sealed connection of each pipe. Combined with the stainless steel V-shaped grid dust collection air outlet and the equipment docking dust source control structure, the system can accurately and tightly capture dust sources from multiple points such as coal sample preparation room, equipment interior, and operating table. This solves the problems of incomplete dust source capture and easy dust leakage in the existing technology.

[0021] The automatic control system with PLC controller as the core realizes the linkage control of the whole system. With the intelligent dust concentration monitoring and air volume adaptive adjustment module, the speed of the vortex fan and the opening of the air valve can be dynamically adjusted according to the dust concentration on site to achieve adaptive air volume adjustment. Compared with the traditional manual control method, it significantly reduces energy consumption and the dust removal effect is more stable.

[0022] The system is equipped with a status signal feedback module and a fault alarm unit, which can collect the working status of each component in real time. When the dust concentration exceeds the limit, the sensor fails, or the equipment is abnormal, it will promptly alarm in the form of sound and light, which will facilitate operators to quickly troubleshoot the fault, improve the stability of continuous operation of the system, and adapt to the working conditions of continuous coal-fired sample preparation.

[0023] The underground pipe system is equipped with a cleaning port and a cleaning device that can regularly clean the pipes to prevent dust accumulation and blockage, reducing the difficulty of later maintenance. At the same time, the back-flushing device is set up in correspondence with the filter device to regularly clean the dust on the surface of the filter device and ensure the long-term efficient operation of the filter device.

[0024] The overall structure is designed to fit the site layout and operational characteristics of the coal-fired power plant sample preparation room. The modular design of each component makes installation and commissioning convenient, greatly improving the working environment of the sample preparation room, reducing the occupational health hazards of dust to operators, and avoiding problems such as equipment failure and decreased sample preparation accuracy caused by dust accumulation. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the overall composition of the dust removal system described in this invention;

[0027] Figure 2 This is a schematic diagram of the dust removal host unit described in this invention;

[0028] Figure 3 This is a schematic diagram of the pipe T-tee connection described in this invention;

[0029] Figure 4 This is a schematic diagram of the trench-stacking and dust collection device described in this invention;

[0030] Figure 5 This is a schematic diagram of the internal dust source control device described in this invention;

[0031] Figure 6 This is a schematic diagram of the dust source treatment device for the operating table described in this invention;

[0032] Figure 7 This is a schematic diagram of the system control principle described in this invention;

[0033] Figure 8 This is a connection block diagram of the intelligent dust concentration monitoring and adaptive module described in this invention.

[0034] In the diagram: 1. Dust collector main unit; 1-1. Vortex fan; 1-2. Backflushing device; 1-3. Filter device; 1-4. Dust collection device; 1-5. Power supply box; 1-6. Air inlet; 2. Underground duct system; 2. PVC main pipe; 2-1. T-type tee connector; 2-2. Flange connection end; 2-3. Cleaning port; 2-4. Underground trench fixing seat; 2-5. Dust source control device; 3. Lifting cylinder; 3-1. Stainless steel V-shaped fence dust suction outlet; 3-2. Underground trench cover; 3-3. Internal dust source control device; 4. Equipment connection flange; 4-1. Frame; 4-3. Dust settling filter frame; 4-4. Cylinder; 4-5. Exhaust port sealing plate; 4-6. Pipe connection flange; 4-7. Solenoid valve; 4-8. Control panel dust source control device; 5. Dust suction outlet. 1. Protective frame 5-2. Control button 5-3. Cleaning device 6. Automatic control system 7. Remote control knob 7-1. Local control button 7-2. PLC controller 7-3. PLC expansion module 7-4. Power control module 7-5. Signal amplification module 7-6. Intermediate relay 7-7. Dust collector main unit control module 7-8. Pulse controller 7-9. Status signal feedback module 7-10. Air volume control actuator 7-11. Dust collector main unit actuator 7-12. External dust source control device actuator 7-13. Internal dust source control device actuator 7-14. Dust concentration acquisition unit 8-1. Air volume adaptive actuator 8-2. Display and setting unit 8-3. Fault alarm unit 8-4. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below 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.

[0036] like Figure 1 - Figure 8 As shown, the present invention provides the following technical solution: a trench-type underground pipe dust removal system suitable for coal-fired power generation sample preparation chambers, mainly composed of a dust removal host 1, a trench-type underground pipe system 2, multi-point dust source control devices (3, 4, 5), and an automatic control system 7, and equipped with a cleaning device 6. All components work together to meet the high dust and multi-point operation requirements of coal-fired sample preparation chambers. The specific structure and connection relationships are as follows:

[0037] The dust collector 1, as the core power and purification component of the system, has its air inlet 1-6 sealed and connected to the PVC main pipe 2-1 of the underground pipe system 2 via flange connection 2-3, thereby enabling the intake of dust-laden airflow. The dust collector 1 integrates a vortex fan 1-1, a filter device 1-3, a back-blowing device 1-2, a dust collection device 1-4, and a power supply box 1-5. The vortex fan 1-1 provides stable negative pressure power to the system, meeting the needs of simultaneous dust collection from three or more dust sources. The filter device 1-3 efficiently intercepts coal dust. The back-blowing device 1-2 is set correspondingly to the filter device 1-3, with a cleaning cycle of 30 minutes / time, regularly cleaning the dust accumulated on the surface of the filter device 1-3. The dust collection device 1-4 is installed below the filter device 1-3 to collect the coal dust falling off during back-blowing. The power supply box 1-5 supplies power to the electrical components of the entire dust collector 1.

[0038] The underground pipe system 2 is adapted to the layout of the coal sample preparation room. It uses a DN110 PVC main pipe 2-1 as the main conveying channel, which is fixedly buried in the trench of the coal sample preparation room through the trench fixing seat 2-5, without occupying the working space. The PVC main pipe 2-1 branches through T-type tee joints 2-2, and is connected to the stainless steel V-shaped grid dust suction port 3-2 of the dust source control device 3, the pipe connection flange 4-7 of the internal dust source control device 4, and the dust suction port 5-1 of the operating table dust source control device 5. All connection parts are connected by flange connection end 2-3 with rubber seals to ensure the airtightness of the pipe and prevent coal dust leakage from polluting the working environment. The cleaning port 2-4 is set at key positions of the PVC main pipe 2-1 every 5m, and works with the cleaning device 6 to clean the dust inside the pipe regularly to avoid pipe blockage and affect the dust removal effect.

[0039] The multi-point dust source control device is adapted to the characteristics of dust sources in three core operating locations: coal sample preparation room, equipment interior, and operating platform, achieving precise dust collection.

[0040] Dust source control device 3: Installed above the trench in the coal mixing operation area, the lower end of the stainless steel V-shaped fence dust suction vent 3-2 is connected to the PVC main pipe 2-1, and the upper end is fixedly connected to the piston rod of the lifting cylinder 3-1. The lifting cylinder 3-1 is fixed on the metal bracket on the side of the trench. The stainless steel V-shaped fence dust suction vent 3-2 is driven by the telescopic movement to achieve a height adjustment of 0-50cm, which can adapt to the dust collection needs of coal mixing at different heights and improve the collection efficiency. The trench cover 3-3 covers the stainless steel V-shaped fence dust suction vent 3-2. It is closed when not in operation to prevent coal debris from entering the pipe, and automatically opens when in operation.

[0041] Internal dust source control device 4: Seamlessly connected to the dust emission port of the coal-fired sample preparation equipment via the equipment connection flange 4-1. The frame 4-3 is fixed inside the device. The dust settling filter frame 4-4 is installed on the frame 4-3, located between the equipment connection flange 4-1 and the pipeline connection flange 4-7. After the coal-fired dust-laden airflow enters, it first undergoes preliminary settling through the dust settling filter frame 4-4, which can reduce more than 60% of large dust particles entering the main pipeline and reduce the load on the filter device 1-3. The cylinder 4-5 is fixed to the outside of the device housing. The piston rod is connected to the exhaust port sealing plate 4-6. The solenoid valve 4-8 is electrically connected to the cylinder 4-5. By controlling the extension and retraction of the cylinder 4-5, the opening and closing of the exhaust port sealing plate 4-6 is realized, and the working status of the device is precisely controlled.

[0042] Dust source control device 5 for operating table: Integrated next to the coal sample preparation operating table, the dust suction vent 5-1 faces the operating area of ​​the operating table, and the lower end is connected to the PVC main pipe 2-1. The protective frame 5-2 is fixed to the outside of the dust suction vent 5-1 to prevent the operator from accidentally touching it, and at the same time plays a role in dust collection and improves dust suction efficiency. The control button 5-3 is installed on one side of the protective frame 5-2 and is electrically connected to the automatic control system 7. The operator can control the start and stop of the device nearby through the control button 5-3, which is convenient to operate.

[0043] The automatic control system 7 uses a PLC controller 7-3 (Siemens S7-200 series) as the core control unit, which is installed in the control cabinet and is adapted to the multi-point linkage control requirements of the coal-fired sample preparation room.

[0044] The remote control knob 7-1 is located on the sample preparation equipment panel, and the local control button 7-2 is located on the control cabinet panel. Both are electrically connected to the input terminal of the PLC controller 7-3, respectively realizing the input of control commands such as system start / stop and air volume adjustment in remote and local modes. The PLC expansion module 7-4 is connected to the PLC controller 7-3 to expand the I / O interface and meet the needs of simultaneous control of multiple components.

[0045] The power control module 7-5 is electrically connected to the PLC controller 7-3, providing a stable 220V AC power supply for the entire automatic control system 7. It also integrates components such as contactors, leakage protection devices, and thermal relays to cope with high-load operation scenarios in the coal-fired sample preparation room and achieve overload and leakage protection.

[0046] The output of the PLC controller 7-3 is electrically connected to the signal amplification module 7-6. The signal amplification module 7-6 amplifies the weak current control signal output by the PLC and transmits it to the intermediate relay 7-7 to achieve isolation between weak current and strong current, thereby driving the dust collector host control module 7-8 and the air volume control execution component 7-11 to work respectively.

[0047] The dust collector control module 7-8 is electrically connected to the pulse controller 7-9 and the dust collector actuator 7-12 respectively. The pulse controller 7-9 is electrically connected to the back-blowing device 1-2 to control its cleaning frequency and ensure the filtration efficiency of the filter device 1-3 in a high-dust environment of coal combustion. The dust collector actuator 7-12 is electrically connected to the vortex fan 1-1 to control the start, stop and speed adjustment of the vortex fan 1-1, so as to realize multi-level adjustment of air volume.

[0048] The air volume control actuator 7-11 is electrically connected to the external dust source control device actuator 7-13 and the internal dust source control device actuator 7-14 respectively. The external dust source control device actuator 7-13 is electrically connected to the lifting cylinder 3-1 of the dust mixing device 3 and the control circuit of the operating table dust source control device 5. The internal dust source control device actuator 7-14 is electrically connected to the solenoid valve 4-8 of the internal dust source control device 4, so as to realize the precise linkage control of each dust source device.

[0049] The status signal feedback module 7-10 is electrically connected to the PLC controller 7-3. It collects the working status signals of the dust removal host 1, the dust mixing source control device 3, the internal dust source control device 4, and the operating panel dust source control device 5, and feeds them back to the PLC controller 7-3 in real time. This facilitates logical judgment by the PLC controller 7-3 and provides accurate basis for troubleshooting equipment faults.

[0050] The intelligent dust concentration monitoring and adaptive airflow adjustment module is adapted to the large fluctuations in dust concentration in the coal-fired sample preparation chamber, enabling real-time monitoring of dust concentration and dynamic adjustment of airflow.

[0051] The dust concentration acquisition unit 8-1 uses a laser dust sensor, which is installed at each dust source point and in the PVC main pipe 2-1 to collect coal dust concentration data in real time. The acquisition frequency is 5 seconds / time, and the data is transmitted to the PLC controller 7-3.

[0052] The display and setting unit 8-3 uses a touch screen, which is installed on the control cabinet panel and electrically connected to the PLC controller 7-3. It is used to display real-time dust concentration data and system operating parameters. At the same time, parameters such as dust concentration threshold (10mg / m³ is recommended) and backflushing cleaning cycle can be manually set.

[0053] The air volume adaptive actuator 8-2 is electrically connected to the PLC controller 7-3. According to the instructions of the PLC controller 7-3, the air volume is adaptively adjusted by adjusting the speed of the vortex fan 1-1 and the opening of the air valves at each dust source point, so as to ensure that the dust concentration is controlled within the preset threshold range.

[0054] The fault alarm unit 8-4 is electrically connected to the PLC controller 7-3. When the PLC controller 7-3 receives a signal indicating that the dust concentration exceeds the limit, or when the dust concentration acquisition unit 8-1 experiences a disconnection or malfunction, it immediately outputs an alarm signal to drive the fault alarm unit 8-4 to issue an audible and visual alarm, reminding the operator to handle the situation promptly.

[0055] System Workflow

[0056] Start-up phase: The operator issues a system start command via remote control knob 7-1 or local control button 7-2. Upon receiving the command, PLC controller 7-3 first controls power control module 7-5 to supply power to the entire system. Then, it drives dust collector actuator 7-12 through dust collector host control module 7-8 to start vortex fan 1-1, and the system begins to establish negative pressure. At the same time, PLC controller 7-3 controls the stacked dust source control device 3, internal dust source control device 4, and operating table dust source control device 5 to enter working state through external dust source control device actuator 7-13 and internal dust source control device actuator 7-14. The trench cover 3-3 opens automatically, the exhaust port seal 4-6 opens, and each dust suction port operates normally.

[0057] Dust collection and purification stage: Under the negative pressure generated by the vortex fan 1-1, the dust in the coal-fired blending operation area enters the PVC main pipe 2-1 of the underground pipe system 2 through the stainless steel V-shaped grid dust suction port 3-2, the dust inside the sample preparation equipment through the internal dust source control device 4, and the dust in the operating table operation area through the dust suction port 5-1. The dust is then transported to the air inlet 1-6 of the dust removal host 1 through the sealed pipe. After the dust-laden airflow enters the dust removal host 1, it is filtered by the filter device 1-3. The coal dust is trapped on the surface of the filter device 1-3. The purified airflow is discharged from the host after meeting the standards.

[0058] Backflushing cleaning stage: PLC controller 7-3 triggers pulse controller 7-9 through dust collector host control module 7-8 according to the preset 30min / cleaning cycle or the differential pressure signal of filter device 1-3. Pulse controller 7-9 controls backflushing device 1-2 to work, blowing 0.6MPa compressed air into filter device 1-3, shaking the dust on the surface of filter device 1-3 into the dust collection device 1-4 below, completing the cleaning and ensuring the long-term efficient operation of filter device 1-3.

[0059] Intelligent monitoring and adaptive adjustment stage: Dust concentration acquisition unit 8-1 continuously collects dust concentration data at each point at a frequency of 5 seconds / time and transmits it to PLC controller 7-3 in real time; PLC controller 7-3 compares the collected concentration data with the preset threshold of 10mg / m³. If the concentration is within the normal range, the current system operation is maintained; if the concentration exceeds the preset threshold, PLC controller 7-3 immediately increases the speed of vortex fan 1-1 through airflow adaptive actuator 8-2, and simultaneously increases the opening of the corresponding air valve of airflow control actuator 7-11 to increase the dust suction airflow until the dust concentration drops to the normal range; if PLC controller 7-3 detects a malfunction in dust concentration acquisition unit 8-1, or if the dust concentration continues to exceed the limit for more than 5 minutes and cannot be reduced to the normal range, it drives fault alarm unit 8-4 to issue an audible and visual alarm to remind operators to check the equipment in time.

[0060] Shutdown and Maintenance Phase: After the operation is completed, the operator issues a shutdown command via remote control knob 7-1 or local control button 7-2. PLC controller 7-3 first controls the shutdown of each dust source control device (ditch cover 3-3 closes, exhaust port seal 4-6 closes), then controls vortex fan 1-1 to run for 5 minutes to empty the residual dust in the pipeline. After that, vortex fan 1-1 stops running, and power control module 7-5 cuts off the power supply to the entire system. During regular maintenance, the operator can clean the dust inside the PVC main pipeline 2-1 through cleaning port 2-4 in conjunction with cleaning device 6, and at the same time clean the coal dust in dust collection device 1-4, check the connection of each component and electrical wiring to ensure the system operates normally next time.

[0061] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A trench-type underground dust collection system for coal-fired sample preparation chambers in thermal power generation, characterized in that, It includes a dust removal unit, a trench-type concealed pipe system, a multi-point dust source control device and an automatic control system, and is equipped with a cleaning device. The multi-point dust source control device is adapted to dust sources in coal sample preparation room, equipment interior, and operating table, including a dust source control device for coal sample preparation, an internal dust source control device, and an operating table dust source control device. The dust removal host is connected to each dust source control device through a trench-type underground pipe system to form a closed dust conveying channel, thereby achieving efficient dust collection and conveying at each point of coal combustion sample preparation. The automatic control system is based on a PLC controller and is electrically connected to the dust removal host and various dust source control devices to achieve system-wide linkage control. The dust removal host integrates a vortex fan, a filter, a back-blowing device, a dust collection device, and an air inlet. The air inlet is connected to a trench-type concealed pipe system. The vortex fan provides negative pressure power, the filter completes dust purification, the back-blowing device is set correspondingly to the filter, and the dust collection device is located below the filter.

2. The underground pipe dust removal system for coal-fired sample preparation chambers in thermal power generation, as described in claim 1, is characterized in that... The underground pipe system includes a PVC main pipe, a T-shaped tee connector, flange connection ends, cleaning ports, and a trench fixing base. The PVC main pipe is buried in the trench of the coal-fired sample preparation room through the trench fixing base. It is branched to various dust source control devices through the T-shaped tee connectors. All connection parts are sealed by the flange connection ends. The cleaning ports are set at intervals on the PVC main pipe. The cleaning devices are used in conjunction with the cleaning ports to prevent dust leakage and facilitate pipe cleaning.

3. The underground pipe dust removal system for coal-fired sample preparation chambers in thermal power generation, as described in claim 1, is characterized in that... The dust source control device includes a lifting cylinder, a stainless steel V-shaped grid dust collection port, and a trench cover. The stainless steel V-shaped grid dust collection port is connected to the PVC main pipe, and the lifting cylinder is driven to the stainless steel V-shaped grid dust collection port. It is adapted to the dust collection needs of coal piles at different heights. The trench cover covers the stainless steel V-shaped grid dust collection port.

4. The underground pipe dust removal system for coal-fired sample preparation chambers in thermal power generation, as described in claim 1, is characterized in that... The internal dust source control device includes an equipment connection flange, a frame, a dust settling filter frame, a cylinder, an exhaust port sealing plate, a pipe connection flange, and a solenoid valve. The equipment connection flange is connected to the coal-fired sample preparation equipment. The dust settling filter frame is fixed between the equipment connection flange and the pipe connection flange through the frame. The pipe connection flange is connected to the PVC main pipe. The solenoid valve is electrically connected to the cylinder. The cylinder piston rod is connected to the exhaust port sealing plate. The control device is opened and closed to reduce the dust load entering the main pipe.

5. A trench-type underground dust collection system for coal-fired sample preparation chambers in thermal power generation, as described in claim 1, is characterized in that... The dust source control device for the operating table includes a dust suction vent, a protective frame, and a control button. The dust suction vent is connected to the PVC main pipe and faces the operating area of ​​the operating table. The protective frame is located on the outside of the dust suction vent. The control button is electrically connected to the automatic control system to achieve local start-stop control.

6. A trench-type underground dust collection system for coal-fired sample preparation chambers in thermal power generation, as described in claim 1, is characterized in that... The automatic control system also includes a remote control knob, a local control button, and a PLC expansion module; the remote control knob and the local control button are electrically connected to the input terminal of the PLC controller, and the PLC expansion module is connected to the PLC controller and expands the I / O interface to adapt to the control requirements of multiple components in coal sample preparation.

7. A trench-type underground dust collection system for coal-fired sample preparation chambers in thermal power generation, as described in claim 6, is characterized in that... The automatic control system also includes a power control module, a signal amplification module, and an intermediate relay. The power control module is electrically connected to the PLC controller to supply power to the system and integrates contactors, leakage protection devices, and thermal relays to achieve overload and leakage protection. The output terminal of the PLC controller is electrically connected to the dust collector control module and the air volume control execution component via the signal amplification module and the intermediate relay to drive both of them to work.

8. A trench-type underground pipe dust removal system for coal-fired sample preparation chambers in thermal power generation, as described in claim 7, is characterized in that... The dust collector control module is electrically connected to the pulse controller and the dust collector execution end. The pulse controller is electrically connected to the back-blowing device and controls its cleaning frequency. The dust collector execution end is electrically connected to the vortex fan and controls its start-up, shutdown, and speed adjustment. The air volume control execution component is electrically connected to the execution end of the external dust source control device and the execution end of the internal dust source control device. The execution end of the external dust source control device is electrically connected to the dust source control device for stockpiling and the dust source control device for the operating platform. The execution end of the internal dust source control device is electrically connected to the internal dust source control device, and controls the operation of each dust source device.

9. A trench-type underground pipe dust removal system for coal-fired sample preparation chambers in thermal power generation, as described in claim 7, is characterized in that... The automatic control system is also equipped with a status signal feedback module, which is electrically connected to the PLC controller. The status signal feedback module collects the working status signals of the dust removal host and each dust source control device and feeds them back to the PLC controller to facilitate fault diagnosis.

10. A trench-type underground dust collection system for coal-fired sample preparation chambers in thermal power generation, as described in any one of claims 1-9, characterized in that, It also includes a dust concentration intelligent monitoring and airflow adaptive adjustment module. The module includes a dust concentration acquisition unit, an airflow adaptive execution unit, a display and setting unit, and a fault alarm unit. The dust concentration acquisition unit is installed at the dust source and inside the PVC main pipe to collect dust concentration signals and transmit them to the PLC controller. The airflow adaptive execution unit, display and setting unit, and fault alarm unit are all electrically connected to the PLC controller. The display and setting unit is used to display concentration data and set system parameters. The airflow adaptive execution unit adjusts the speed of the vortex fan and the opening of the air valve according to the instructions of the PLC controller. The fault alarm unit receives the alarm signal from the PLC controller and provides an audible and visual prompt, with prompt scenarios including dust concentration exceeding the limit and sensor failure.

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