Underground negative pressure pipe trench system for textile mill

Abstract

The application discloses a negative pressure underground pipe trench system for a textile workshop, which comprises an underground pipe trench network, a negative pressure generating unit in communication with the underground pipe trench network, a suction point device arranged at a dust generating equipment, and a dust separation and collection system, and an external source head thermal oxidation fire prevention subsystem is arranged outside the underground pipe trench network, the source head thermal oxidation fire prevention subsystem comprises a regenerative thermal oxidizer and a pre-heat exchanger arranged in a pipeline between the underground pipe trench network and the negative pressure generating unit, and the outlet of the negative pressure generating unit is connected with the gas inlet of the regenerative thermal oxidizer, and the pre-heat exchanger is used for preheating the inhaled fiber dust-containing gas. In the application, the dust-containing gas is preheated to 300-400 DEG C through the pre-heat exchanger, so that the fiber is carbonized and is changed into inert carbon powder, and the regenerative thermal oxidizer further completely oxidizes the residual combustible material into CO2 and H2O, so that the three elements of explosion, i.e. combustible material, fire source and oxygen, are eliminated from the root.

Description

Technical Field

[0001] This invention relates to the field of rock textile technology, and more particularly to an underground negative pressure pipe trench system for textile factories. Background Technology

[0002] As the core production site of the textile industry, textile factories generate pollutants such as fiber dust, lint, exhaust gas, and heat during their processes. If these pollutants are not effectively controlled, they will not only severely pollute the workshop environment and harm workers' respiratory health, but also cause frequent mechanical failures and reduce production efficiency due to dust accumulation on equipment. Furthermore, traditional ground-level exhaust ducts, due to their space requirements and difficulty in cleaning dust, further exacerbate the difficulty of environmental management. Therefore, to address these pain points, the underground negative pressure pipe trench system has emerged. This system constructs a closed network of pipe trenches underground in the factory, using the principle of negative pressure suction to centrally transport pollutants generated from each process to the treatment terminal, achieving highly efficient pollutant capture. The system integrates source control to create a clean, safe, and efficient workshop microenvironment, ensuring worker health, improving equipment operational stability, and reducing cleaning and maintenance costs. It achieves resource recycling through the recovery and reuse of fibers and heat energy from waste gases. Simultaneously, the concealed design of underground pipe trenches avoids a cluttered layout of surface pipelines, optimizing factory space utilization. The implementation of this system not only aligns with the modern textile industry's trend towards green production, energy conservation, and emission reduction, but also overcomes the limitations of traditional environmental governance methods through technological innovation. It provides a replicable and scalable integrated solution for environmental governance in the textile industry, demonstrating significant environmental, economic, and social benefits.

[0003] Textile dust primarily originates from the processing of fibrous materials such as cotton, linen, wool, and synthetic fibers. This dust possesses the following characteristics: combustibility, fine particle size, and easy suspension. Textile dust explosions require five essential elements: combustible dust, oxygen, suspension, ignition source, and a certain concentration range. The first three elements—combustible dust, oxygen, and suspension—are readily met in textile production. Current technology employs spark detection and extinguishing systems, but these are reactive measures. There is a delay between the generation and detection of a spark, and extinguishing agents may not completely extinguish all ignition sources. The underlying principle is "extinguishing" rather than "preventing." Therefore, an underground negative pressure pipe trench system for textile factories is proposed. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing an underground negative pressure pipe trench system for textile factories.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A negative pressure pipe trench system for textile mills includes an underground pipe trench network, a negative pressure generating unit connected to the underground pipe trench network, suction devices installed at dust-generating equipment, and a dust separation and collection system. The negative pressure generating unit is an explosion-proof variable frequency centrifugal fan. A source thermal oxidation fire prevention subsystem is installed outside the underground pipe trench network. The source thermal oxidation fire prevention subsystem includes a regenerative thermal oxidizer and a preheater installed in the pipeline between the underground pipe trench network and the negative pressure generating unit. The outlet of the negative pressure generating unit is connected to the inlet of the regenerative thermal oxidizer. The preheater is used to preheat the intake gas containing fiber dust. The regenerative thermal oxidizer completely oxidizes and decomposes the preheated waste gas, ultimately emitting clean CO2 and water vapor, while recovering a large amount of heat energy.

[0007] The underground pipe network includes a double-wall corrugated main pipe, and suction devices are arranged along the double-wall corrugated main pipe. The suction devices include branch pipe interface modules, and the branch pipe interface modules include dual-stage flow guides. The dual-stage flow guides include an upper flow guide and a lower flow guide, and a transition zone is provided between the upper flow guide and the lower flow guide.

[0008] The underground pipe network is divided into multiple double-wall corrugated main pipes. Each double-wall corrugated main pipe is equipped with a vortex generator at its lower part to generate rotating airflow to remove deposits. Each double-wall corrugated main pipe is equipped with a pressure sensor inside to monitor the pressure data of the corresponding pipe section.

[0009] The above technical solution further includes:

[0010] Furthermore, a vertical gap region is provided inside the transition region. The vertical gap of the vertical gap region is .mm-.mm. The gap is composed of metal mesh lines and is constructed as a self-cleaning structure that generates -Hz vortex pulses.

[0011] Furthermore, a central controller is included, which is signal-connected to the pressure sensor and the eddy current generator. The central controller receives real-time pressure data sent by the pressure sensor, calculates the resistance trend of the corresponding double-wall corrugated main pipe based on the real-time pressure data, and controls the eddy current generator of the corresponding double-wall corrugated main pipe to work when the resistance trend exceeds a preset threshold. The central controller is also configured to control multiple eddy current generators to start in turn according to a preset time and sequence to perform pulse purging. The eddy current generator is a compressed air driven eddy current generator.

[0012] Furthermore, the dust separation and collection system includes a primary cyclone separator and a bag filter. The air inlet of the primary cyclone separator is connected to the double-walled corrugated main pipe of the underground pipe trench network. The clean air outlet of the primary cyclone separator is connected to the air inlet of the bag filter. The cone bottom dust discharge port of the primary cyclone separator is equipped with a primary dust collection device. The ash hopper of the bag filter is equipped with a secondary dust collection device. The bag filter is connected to the air inlet of the negative pressure generating unit through the preheater.

[0013] Furthermore, the branch pipe interface module is equipped with an adaptive electric air valve, which is linked to the PLC signal of the workshop equipment.

[0014] Furthermore, the inner layer of the double-wall corrugated main pipe is a conductive metal corrugated pipe, and the outer layer is an HDPE corrugated pipe. A foamed concrete buffer layer is filled between the conductive metal corrugated pipe and the HDPE corrugated pipe.

[0015] Furthermore, the bottom of the double-walled corrugated main pipe is provided with a pre-embedded H-shaped steel rail.

[0016] Furthermore, a square mesh filter plate is provided inside the upper guide port, and a hexagonal honeycomb filter plate is provided inside the lower guide port.

[0017] The present invention has the following beneficial effects:

[0018] 8. In this invention, the dust-laden gas is preheated to 300-400°C by a preheater to carbonize the fibers and transform them into inert carbon powder. The regenerative thermal oxidizer further oxidizes the remaining combustibles into CO2 and H2O, eliminating the three elements of an explosion from the source: combustibles, ignition source, and oxygen.

[0019] 9. In this invention, the branch pipe interface module has a dual-stage flow guide port, a square grid + hexagonal honeycomb filter plate to intercept large fiber particles, and a vertical gap in the transition zone to generate 200-250Hz vortex pulses. The high-frequency vibration causes the fibers to fatigue and break and detach from the grid, avoiding blockage of the suction point. A vortex generator is set at the bottom of the double-walled corrugated main pipe, which, combined with a pressure sensor, monitors the resistance trend of the pipe section in real time. When the resistance exceeds the threshold, the central controller triggers the vortex generator to generate rotating airflow to perform pulsed purging of the deposits at the bottom of the pipe, achieving "on-demand cleaning" without the need for manual cleaning during shutdown. Attached Figure Description

[0020] Figure 1 This is a system block diagram of the underground negative pressure pipe trench system for textile factories proposed in this invention;

[0021] Figure 2 This is a schematic diagram of the underground pipe trench network in this invention;

[0022] Figure 3This is a partial structural schematic diagram of the underground pipe trench network and suction device in this invention;

[0023] Figure 4 This is a schematic diagram of the suction point device in the present invention;

[0024] Figure 5 for Figure 2 Enlarged view of point A in the middle;

[0025] Figure 6 This is a system block diagram of the eddy current generator control in this invention.

[0026] In the diagram: 1. Underground pipe trench network; 11. Double-wall corrugated main pipe; 111. Conductive metal corrugated pipe; 112. HDPE corrugated pipe; 113. Foamed concrete buffer layer; 2. Negative pressure generating unit; 3. Suction point device; 31. Branch pipe interface module; 311. Upper guide port; 312. Lower guide port; 313. Transition zone; 314. Vertical gap zone; 4. Dust separation and collection system; 41. Primary cyclone separator; 42. Bag filter; 43. Primary dust collection device; 44. Secondary dust collection device; 51. Pressure sensor; 52. Vortex generator; 53. Central controller; 61. Regenerative thermal oxidizer; 62. Pre-exchange heat exchanger. Detailed Implementation

[0027] 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.

[0028] Please see Figures 1-6 As shown, this invention is an underground negative pressure pipe trench system for textile factories, including an underground pipe trench network 1, a negative pressure generating unit 2 connected to the underground pipe trench network 1, a suction point device 3 installed at the dust generating equipment, and a dust separation and collection system 4. The negative pressure generating unit 2 is an explosion-proof variable frequency centrifugal fan. An external source thermal oxidation fire prevention subsystem is installed outside the underground pipe trench network 1. The source thermal oxidation fire prevention subsystem includes a regenerative thermal oxidizer 61 and a preheater 62 installed in the pipeline between the underground pipe trench network 1 and the negative pressure generating unit 2. The outlet of the negative pressure generating unit 2 is connected to the inlet of the regenerative thermal oxidizer 61. The preheater 62 is used to preheat the gas containing fiber dust that is drawn in. The regenerative thermal oxidizer 61 completely oxidizes and decomposes the preheated waste gas, and the final emission is clean CO2 and water vapor, while recovering a large amount of heat energy.

[0029] The underground pipe network 1 includes a double-wall corrugated main pipe 11, and a suction device 3 is arranged along the double-wall corrugated main pipe 11. The suction device 3 includes a branch pipe interface module 31. The branch pipe interface module 31 includes a two-stage flow guide port. The two-stage flow guide port includes an upper flow guide port 311 and a lower flow guide port 312. A transition zone 313 is provided between the upper flow guide port 311 and the lower flow guide port 312.

[0030] The underground pipe network 1 is divided into multiple double-wall corrugated main pipes 11. Each double-wall corrugated main pipe 11 is equipped with a vortex generator 52 at its lower part to generate rotating airflow to remove deposits. Each double-wall corrugated main pipe 11 is equipped with a pressure sensor 51 to monitor the pressure data of the corresponding pipe section.

[0031] In one embodiment, a vertical gap region 314 is provided inside the transition region 313. The vertical gap of the vertical gap region 314 is 0.45mm-0.55mm. This gap is constructed as a self-cleaning structure that generates 200-250Hz vortex pulses.

[0032] In one embodiment, a central controller 53 is included. The central controller 53 is connected to a pressure sensor 51 and an eddy current generator 52. The central controller 53 receives real-time pressure data sent by the pressure sensor 51 and calculates the resistance trend of the corresponding double-wall corrugated main pipe 11 based on the real-time pressure data. When the resistance trend exceeds a preset threshold, the central controller 53 controls the eddy current generator 52 of the corresponding double-wall corrugated main pipe 11 to work. The central controller 53 is also configured to control multiple eddy current generators 52 to start in turn according to a preset time and sequence to perform pulse purging. The eddy current generator 52 is a compressed air driven eddy current generator.

[0033] In one embodiment, the dust separation and collection system 4 includes a primary cyclone separator 41 and a bag filter 42. The air inlet of the primary cyclone separator 41 is connected to the double-walled corrugated main pipe 11 of the underground pipe network 1. The clean air outlet of the primary cyclone separator 41 is connected to the air inlet of the bag filter 42. The cone bottom dust discharge port of the primary cyclone separator 41 is equipped with a primary dust collection device 43. The ash hopper of the bag filter 42 is equipped with a secondary dust collection device 44. The bag filter 42 is connected to the air inlet of the negative pressure generating unit 2 through a preheater 62.

[0034] In this embodiment:

[0035] Air rich in fibers and dust is drawn into the system from the underground pipe network and first enters the primary cyclone separator 41. In the primary cyclone separator 41, centrifugal force is used to separate most of the heavier fibers and dust, which are then sealed and discharged into the primary dust collection device 43 through the rotary discharge valve at the bottom. At this point, the gas mainly contains light and fine fibers and dust that are difficult to remove by centrifugal force. The gas, which has undergone preliminary separation but still poses a risk of combustibility, then enters the preheater 62. The preheater 62 exchanges heat with the high-temperature clean gas from the regenerative thermal oxidizer 61. The gas is heated to 300-400°C in the preheater 62. At this temperature, the organic fibers carried in the gas undergo pyrolysis and carbonization reactions, and their physical properties are fundamentally changed. They lose their stickiness and no longer easily adhere to the pipe walls, transforming from flammable organic matter into non-flammable, loose carbon powder. At the same time, any potential ignition source that might be inhaled, such as sparks, will lose its ignition ability due to rapid heating by the surrounding high-temperature environment. Thus, before the gas enters the main fan and subsequent devices, the elements of combustion and explosion have been fundamentally eliminated, achieving intrinsic safety.

[0036] After preheating and carbonization, the gas enters one of the regenerator chambers of the regenerative thermal oxidizer 61 through a switching valve. As the gas flows through the regenerator ceramic bed, it is further heated to the operating temperature of the regenerator 61. At this high temperature, the remaining carbon powder, VOCs, and other combustible components in the gas react violently with oxygen, being completely oxidized and decomposed into harmless carbon dioxide (CO2) and water vapor (H2O). The purified high-temperature gas, approximately 800°C, flows through another "cold" regenerator ceramic bed before leaving the regenerator 61. The high-temperature purified gas transfers most of its heat to the ceramic regenerator, reducing its own temperature to only a few tens of degrees higher than the inlet temperature. The heated regenerator stores energy for preheating newly entering waste gas in the next cycle. Through the periodic switching of the switching valve, multiple regenerator chambers alternately undergo heat absorption and release processes.

[0037] Clean gas, cooled to ~150°C, is drawn to the chimney by an induced draft fan and discharged into the atmosphere after meeting emission standards. Its main components are N2, CO2, and H2O. The gas flowing out from the other side of the regenerative thermal oxidizer 61 is medium-high temperature clean gas that has been cooled by the preheated waste gas. This part of the gas can be further recovered for heat energy through additional secondary heat exchange systems such as hot air circulation systems, hot water boilers, and ORC power generation systems.

[0038] In one embodiment, the branch pipe interface module 31 is equipped with an adaptive electric air valve, which is linked to the PLC signal of the workshop equipment to dynamically adjust the opening of the air valve according to the start-up and shutdown status of the equipment.

[0039] In one embodiment, the inner layer of the double-walled corrugated main pipe 11 is a conductive metal corrugated pipe 111, and the outer layer is an HDPE corrugated pipe 112. A foamed concrete buffer layer 113 is filled between the conductive metal corrugated pipe and the HDPE corrugated pipe.

[0040] In one embodiment, the bottom of the double-walled corrugated main pipe 11 is provided with a pre-embedded H-shaped steel rail 12.

[0041] In one embodiment, a square mesh filter plate is provided inside the upper guide port 311, and a hexagonal honeycomb filter plate is provided inside the lower guide port 312, with the ratio of the square to the hexagonal opening area being 1.8:1 to 2.2:1.

[0042] In this embodiment:

[0043] When the system is running normally, the dust-laden airflow passes evenly through the upper guide port 311 and the lower guide port 312. Large cotton particles and fiber clumps are physically intercepted by the square grid of the upper guide port and attached to the grid threads. As the cotton accumulation thickens, the effective ventilation area of ​​the grid gradually decreases, resulting in a significant increase in local airflow resistance ΔP. When the cotton accumulation thickness reaches 1.5-2.0mm, the measured local resistance can increase by 30-50%. The airflow follows the principle of "minimum path resistance", bypassing the blocked grid holes and flowing into the unblocked area and the lower guide port 312 in large quantities.

[0044] When the airflow passes through the 0.45mm-0.55mm vertical gap in the vertical gap region 314, the flow velocity spikes instantaneously, generating periodically alternating vortices behind it. The vortex street frequency (f) is determined by the Strouhal number (St), calculated as f = (St × V) / d, where St is a dimensionless constant of approximately 0.2 for a cylinder, V is the incoming flow velocity (taken as 28 m / s), and d is the diameter of the mesh wire. The calculated result is: f = (0.2 × 28) / 0.0001 = 56000 Hz. Due to structural damping and the complexity of the flow field, the measured effective transmission frequency is 200-250 Hz, which is still within the high-frequency vibration range. This high-frequency vibration wave is transmitted through the metal mesh wire to the entire upper guide port 311 structure, especially concentrated in the area where the cotton fibers are attached.

[0045] Under continuous high-frequency vibration, the cotton fibers undergo fatigue fracture, and the bonding force between the internal fibers is destroyed. The acceleration generated by the vibration allows the cotton particles to gain sufficient inertial force, thereby overcoming the electrostatic adsorption force and van der Waals force with the grid surface, and being thrown off the grid surface. The detached cotton clumps are carried away by the main airflow, the grid ventilation area is restored, the local resistance is reduced to the normal level, and the airflow returns to uniform distribution until the next accumulation cycle begins.

[0046] The working principle of the underground negative pressure pipe trench system for textile factories is as follows: the fiber fluff and dust generated by the dust-generating equipment are sucked into the suction point device 3 under the action of the negative pressure suction force generated by the negative pressure generating unit 2. The dust-laden airflow first enters the upper guide port 311 of the branch pipe interface module 31. The square grid filter plate inside performs preliminary rectification and diffusion on the intake airflow, capturing large cotton particles. When the airflow passes through a right angle, boundary layer separation is generated to form a low-pressure vortex zone, which causes the light cotton to be adsorbed on the edge of the mesh, avoiding blockage at the rear end. The airflow containing micro-dust in the lower layer is rectified by the hexagonal honeycomb filter plate of the lower guide port 312. After forming a stable and uniform airflow, the flow velocity in the lower layer is 2.5 to 3.0 times that in the upper layer.

[0047] The airflow passing through the upper guide port 311 and the lower guide port 312 passes through the transition zone 313. The specially designed vertical gap zone 314 in this zone generates a specific frequency vortex pulse of 200-250Hz when the airflow passes through. This pulse has two effects: firstly, it plays a self-cleaning role for the module itself, preventing fibers from adhering and accumulating here; secondly, the pulsed airflow can better "encapsulate" dust, allowing it to enter the branch pipe more smoothly and merge into the double-wall corrugated main pipe 11 of the underground pipe trench network 1.

[0048] Under the strong negative pressure provided by the fan, the dust-laden airflow is transported at high speed in the double-walled corrugated main duct. Pressure sensors 51 arranged along the duct monitor the pressure drop, i.e., resistance, of each duct section in real time and transmit the data to the central controller 53. The central controller 53 calculates the resistance trend of each duct section in real time through an algorithm. When the trend indicates that there is a risk of dust accumulation and increased resistance in a certain duct section, the system will trigger an early warning and automatically start the vortex generator 52 at the bottom of the duct section. The vortex generator 52 generates a high-speed rotating and powerful airflow to perform pulsed purging of the bottom of the duct, re-rolling up any dust that may have been deposited and sending it into the airflow, thereby achieving active and online duct self-cleaning and fundamentally preventing blockage. The controller can also arrange all vortex generators to work in sequence for preventive maintenance.

[0049] The dust-laden airflow first enters the primary cyclone separator 41 of the dust separation and collection system 4. Using centrifugal force, most of the heavier fibers and dust are separated and fall into the primary dust collection device 43. The gas after primary purification then enters the preheat exchanger 62. Here, the low-temperature exhaust gas exchanges heat with the high-temperature clean gas discharged from the regenerative thermal oxidizer 61. The exhaust gas is preheated to above 300°C. This process has the dual purpose of intrinsic safety and energy recovery. Intrinsic safety is achieved because the high temperature of preheating is sufficient to rapidly carbonize the fine, sticky fibers remaining in the exhaust gas, causing them to lose their stickiness and flammability and transform into loose, inert carbon powder. This completely eliminates the risk of combustion or explosion in subsequent pipelines, dust collectors, and fans. Energy recovery is achieved because preheating significantly reduces the energy required for the subsequent regenerative thermal oxidizer to heat the exhaust gas to the oxidation temperature, resulting in significant energy savings. The preheated gas enters the bag filter 42, where fine particulate matter, including carbonized particles, is thoroughly filtered out and collected in the secondary dust collection device 44.

[0050] Finally, the highly purified gas is drawn in by the fan of the negative pressure generating unit 2 and sent to the regenerative thermal oxidizer 61, where any trace amounts of organic pollutants that may remain are completely oxidized and decomposed into harmless CO2 and water vapor before being discharged in compliance with standards. The heat recovered during RTO operation is then used to heat the heat exchanger before heating, forming a highly efficient energy cycle.

[0051] The central controller 53 is the brain of the entire system. Based on feedback from pressure sensors in each pipe section, it intelligently determines the frequency and timing of eddy current cleaning. Simultaneously, it works in conjunction with the adaptive electric dampers installed in the branch pipe interface module 31 and the PLC system of the workshop production equipment to obtain real-time equipment start-up and shutdown status. When a piece of equipment stops, it automatically reduces or closes its corresponding damper, redistributing airflow to the running equipment, achieving "on-demand allocation" and thus significantly reducing system energy consumption.

[0052] 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 variations 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. An underground negative pressure pipe trench system for textile factories, comprising an underground pipe trench network (1), a negative pressure generating unit (2) connected to the underground pipe trench network (1), a suction point device (3) installed at the dust-generating equipment, and a dust separation and collection system (4), characterized in that, The underground pipe network (1) is equipped with a source thermal oxidation fire prevention subsystem. The source thermal oxidation fire prevention subsystem includes a regenerative thermal oxidizer (61) and a preheater (62) installed in the pipeline between the underground pipe network (1) and the negative pressure generating unit (2). The outlet of the negative pressure generating unit (2) is connected to the air inlet of the regenerative thermal oxidizer (61). The preheater (62) is used to preheat the inhaled gas containing fiber dust. The underground pipe network (1) includes a double-wall corrugated main pipe (11), and a suction device (3) is arranged along the double-wall corrugated main pipe (11). The suction device (3) includes a branch pipe interface module (31). The branch pipe interface module (31) includes a two-stage flow guide port. The two-stage flow guide port includes an upper flow guide port (311) and a lower flow guide port (312). A transition zone (313) is provided between the upper flow guide port (311) and the lower flow guide port (312). The underground pipe network (1) is divided into multiple double-wall corrugated main pipes (11). Each double-wall corrugated main pipe (11) is equipped with a vortex generator (52) at the bottom to generate rotating airflow to remove deposits. Each double-wall corrugated main pipe (11) is equipped with a pressure sensor (51) to monitor the pressure data of the corresponding pipe section.

2. The underground negative pressure pipe trench system for textile factories according to claim 1, characterized in that, The transition zone (313) is provided with a vertical gap zone (314), and the vertical gap of the vertical gap zone (314) is 0.45mm-0.55mm.

3. The underground negative pressure pipe trench system for textile factories according to claim 1, comprising a central controller (53), characterized in that, The central controller (53) is connected to the pressure sensor (51) and the eddy current generator (52) via signals. The central controller (53) receives real-time pressure data sent by the pressure sensor (51) and calculates the resistance trend of the corresponding double-wall corrugated main pipe (11) based on the real-time pressure data. When the resistance trend exceeds a preset threshold, the central controller (53) controls the eddy current generator (52) of the corresponding double-wall corrugated main pipe (11) to work. The central controller (53) is also configured to control multiple eddy current generators (52) to start in turn according to a preset time and sequence to perform pulse purging.

4. The underground negative pressure pipe trench system for textile factories according to claim 1, characterized in that, The dust separation and collection system (4) includes a primary cyclone separator (41) and a bag filter (42). The air inlet of the primary cyclone separator (41) is connected to the double-wall corrugated main pipe (11) of the underground pipe network (1). The clean air outlet of the primary cyclone separator (41) is connected to the air inlet of the bag filter (42). The dust discharge port at the cone bottom of the primary cyclone separator (41) is equipped with a primary dust collection device (43). The dust hopper of the bag filter (42) is equipped with a secondary dust collection device (44). The bag filter (42) is connected to the air inlet of the negative pressure generating unit (2) through the preheater (62).

5. The underground negative pressure pipe trench system for textile factories according to claim 1, characterized in that, The branch pipe interface module (31) is equipped with an adaptive electric air valve, which is linked with the workshop equipment PLC signal.

6. The underground negative pressure pipe trench system for textile factories according to claim 1, characterized in that, The inner layer of the double-wall corrugated main pipe (11) is a conductive metal corrugated pipe (111), and the outer layer is an HDPE corrugated pipe (112). A foamed concrete buffer layer (113) is filled between the conductive metal corrugated pipe and the HDPE corrugated pipe.

7. The underground negative pressure pipe trench system for textile factories according to claim 1, characterized in that, The bottom of the double-wall corrugated main pipe (11) is equipped with a pre-embedded H-shaped steel rail (12).

8. The underground negative pressure pipe trench system for textile factories according to claim 1, characterized in that, The upper guide port (311) is provided with a square grid filter plate, and the lower guide port (312) is provided with a hexagonal honeycomb filter plate.

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