Underground negative pressure pipe ditch system for textile workshop

Abstract

The invention discloses an underground negative pressure pipe ditch system for a textile workshop, which comprises an underground pipe ditch network, a negative pressure generation unit communicated with the underground pipe ditch network, a suction point device arranged at dust generation equipment and a dust separation and collection system, and a source thermal oxidation fire prevention subsystem is arranged outside the underground pipe ditch network. The source thermal oxidation fire prevention subsystem comprises a heat storage type thermal oxidizer and a front heat exchanger arranged in a pipeline between the underground pipe ditch network and the negative pressure generation unit, an outlet of the negative pressure generation unit is connected with a gas inlet of the heat storage type thermal oxidizer, and the front heat exchanger is used for preheating sucked gas containing fiber dust. According to the invention, dust-containing gas is preheated to 300-400 DEG C through the front heat exchanger, so that fibers are carbonized and converted into inert carbon powder, residual combustible materials are further thoroughly oxidized into COO and HO through the heat accumulating type thermal oxidizer, and three explosion elements, namely combustible materials, a fire source and oxygen, are eliminated from the source.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of rock weaving, in particular to an underground negative pressure pipe trench system for textile workshops. BACKGROUND

[0002] As the core place of textile industry production, the textile workshop produces fiber dust, flying fibers, waste gas and heat and other pollutants in the process flow. If these pollutants are not effectively controlled, they will not only seriously pollute the workshop environment and harm the respiratory health of workers, but also cause frequent mechanical failures and reduce production efficiency due to dust accumulation on equipment. At the same time, the traditional ground exhaust duct further aggravates the difficulty of environmental management due to space occupation, dust accumulation and difficult cleaning. Therefore, in order to solve the above problems, the underground negative pressure pipe trench system is born. The system builds a closed pipe trench network underground, uses negative pressure suction principle to collect pollutants generated in each process through underground pipes and transports them to the treatment terminal, realizes efficient capture and source control of pollutants, and aims to build a clean, safe and efficient workshop microenvironment, protect workers' health, improve equipment operation stability and reduce cleaning and maintenance costs. Through the recycling of fibers in waste gas and the recycling of heat energy, resource recycling is realized. At the same time, the hidden design of underground pipe trench avoids the messy layout of ground pipe, optimizes the utilization rate of workshop space, and the implementation of the system not only meets the development trend of modern textile industry green production, energy saving and emission reduction, but also solves the limitations of traditional environmental management methods through technological innovation, providing a replicable, generalizable and integrated solution for textile industry environmental management, which has significant environmental, economic and social benefits.

[0003] Textile dust mainly comes from the processing of cotton, hemp, wool and chemical fiber materials. These dusts have the following characteristics: flammability, small particle size and easy suspension. Textile dust explosion needs to meet the five elements of explosion: combustible dust, oxygen, suspension state, ignition source and certain concentration. Among them, the first three elements, combustible dust, oxygen and suspension state, are easily met in textile production. In the prior art, spark detection + fire extinguishing system is used, but the spark detection + fire extinguishing system is a post-intervention means. There is a delay from the generation of sparks to the detection, and the fire extinguishing agent injection may not completely extinguish all ignition sources. Its concept is "rescue" rather than "eliminate", therefore, the underground negative pressure pipe trench system for textile workshops is proposed. SUMMARY

[0004] The purpose of the present application is to solve the problems in the prior art and provide an underground negative pressure pipe trench system for textile workshops.

[0005] In order to achieve the above purpose, the present application adopts the following technical scheme: The underground negative pressure pipe trench system for textile factory building comprises an underground pipe trench network, a negative pressure generating unit communicated with the underground pipe trench network, a suction point device arranged at a dust generating equipment, and a dust separation and collection system, the negative pressure generating unit is an anti-explosion variable frequency centrifugal fan, an external source hot oxidation fire prevention subsystem is arranged outside the underground pipe trench network, the source hot oxidation fire prevention subsystem comprises a regenerative thermal oxidizer and a front heat exchanger arranged in a pipeline between the underground pipe trench network and the negative pressure generating unit, an outlet of the negative pressure generating unit is connected with an air inlet of the regenerative thermal oxidizer, the front heat exchanger is used for preheating the inhaled fiber dust containing gas, the regenerative thermal oxidizer completely oxidizes and decomposes the preheated waste gas, and finally clean CO2 and water vapor are discharged, and a large amount of heat energy is recovered; The underground pipe trench network comprises a double-wall corrugated main pipeline, a suction point device is arranged along the double-wall corrugated main pipeline, the suction point device comprises a branch pipe interface module, the branch pipe interface module comprises a double-stage flow guide port, the double-stage flow guide port comprises an upper flow guide port and a lower flow guide port, and a transition zone is arranged between the upper flow guide port and the lower flow guide port. The underground pipe trench network is divided into a plurality of double-wall corrugated main pipelines, a vortex generator is arranged at a lower portion of each double-wall corrugated main pipeline and used for generating a rotating airflow to remove deposits, and a pressure sensor is arranged inside each double-wall corrugated main pipeline and used for monitoring pressure data of a corresponding pipeline section.

[0006] The above technical solution further comprises: Further, a vertical gap zone is arranged inside the transition zone, a vertical gap of the vertical gap zone is.mm-.mm, the gap is composed of a metal grid line, and the gap is configured as a self-cleaning structure for generating a -Hz vortex pulse.

[0007] Further, a central controller is arranged, the central controller is signal connected with the pressure sensor and the vortex generator, the central controller receives real-time pressure data sent by the pressure sensor, calculates a resistance trend of a corresponding double-wall corrugated main pipeline according to the real-time pressure data, controls the vortex generator of the corresponding double-wall corrugated main pipeline to work when the resistance trend exceeds a preset threshold, and the central controller is further configured to control a plurality of vortex generators to be started in a preset time and sequence in turn to perform pulse blowing, and the vortex generator is a compressed air driven vortex generator.

[0008] Further, the dust separation and collection system comprises a primary cyclone separator and a bag-type dust collector, the air inlet of the primary cyclone separator is communicated with the double-wall corrugated main pipeline of the underground pipe trench network, the clean gas outlet of the primary cyclone separator is connected with the air inlet of the bag-type dust collector, the dust outlet of the conical bottom of the primary cyclone separator is provided with a primary dust collection device, the ash bucket of the bag-type dust collector is provided with a secondary dust collection device, and the bag-type dust collector is connected with the air inlet of the negative pressure generating unit through the front heat exchanger.

[0009] Further, the branch pipe interface module is installed with an adaptive electric air valve which is linked with the PLC signal of the workshop equipment.

[0010] Further, the inner layer of the double-wall corrugated main pipeline is provided with a conductive metal corrugated pipe, and the outer layer is provided with an HDPE corrugated pipe, and the conductive metal corrugated pipe and the HDPE corrugated pipe are filled with a foamed concrete buffer layer.

[0011] Further, the double-wall corrugated main pipeline is provided with a pre-embedded H-shaped steel rail at the bottom.

[0012] Further, the upper flow guide opening is internally provided with a square grid filter plate, and the lower flow guide opening is internally provided with a hexagonal honeycomb filter plate.

[0013] The present application has the following beneficial effects: 8、In the present application, the dust-containing gas is preheated to 300-400 DEG C through the front heat exchanger, so that the fiber is carbonized and converted into inert carbon powder, and the residual combustible material is completely oxidized into CO2 and H2O by the regenerative thermal oxidizer, thereby eliminating the three elements of explosion: combustible material, fire source and oxygen.

[0014] 9、In the present application, the double-stage flow guide opening of the branch pipe interface module, the square grid + hexagonal honeycomb filter plate intercepts large particle fibers, the vertical gap in the transition zone generates 200-250 Hz vortex pulse, and the fiber is fatigued and broken by high-frequency vibration and separated from the grid, so that suction point blockage is avoided, the vortex generator is arranged at the bottom of the double-wall corrugated main pipeline, and the pressure sensor is used to monitor the resistance trend of the pipeline section in real time, when the resistance exceeds the threshold value, the central controller triggers the vortex generator to generate rotating air flow, so that the sediment at the bottom is pulsedly swept, and the "cleaning on demand" is realized without stopping and manual cleaning. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 The system block diagram of the underground negative pressure pipe trench system for textile workshops is provided in the present application; Figure 2 The structural schematic diagram of the underground pipe trench network in the present application is provided; Figure 3 The partial structural schematic diagram of the underground pipe trench network and the suction point device in the present application is provided; Figure 4 Fig. 1 is a schematic diagram of the structure of the suction point device in the present application; Figure 5 Fig. 2 is a schematic diagram of the structure of the suction point device in the present application; Figure 2 Fig. 3 is an enlarged schematic diagram of A in Fig. 2; Figure 6 Fig. 4 is a system block diagram of the vortex generator control in the present application.

[0016] Fig. 1 is a schematic diagram of the structure of the suction point device in the present application; Fig. 2 is a schematic diagram of the structure of the suction point device in the present application; Fig. 3 is an enlarged schematic diagram of A in Fig. 2; Fig. 4 is a system block diagram of the vortex generator control in the present application. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present application.

[0018] Fig. 1 is a schematic diagram of the structure of the suction point device in the present application; Fig. 2 is a schematic diagram of the structure of the suction point device in the present application; Fig. 3 is an enlarged schematic diagram of A in Fig. 2; Fig. 4 is a system block diagram of the vortex generator control in the present application. Figures 1-6 Fig. 1 is a schematic diagram of the structure of the suction point device in the present application; Fig. 2 is a schematic diagram of the structure of the suction point device in the present application; Fig. 3 is an enlarged schematic diagram of A in Fig. 2; Fig. 4 is a system block diagram of the vortex generator control in the present application. The underground pipe network 1 comprises a double-wall corrugated main pipe 11, a suction point device 3 is arranged along the double-wall corrugated main pipe 11, the suction point device 3 comprises a branch pipe interface module 31, the branch pipe interface module 31 comprises a double-stage flow guide, the double-stage flow guide comprises an upper flow guide 311 and a lower flow guide 312, and a transition zone 313 is arranged between the upper flow guide 311 and the lower flow guide 312; The underground pipe network 1 is divided into a plurality of double-wall corrugated main pipes 11, a vortex generator 52 is arranged at a lower portion of each double-wall corrugated main pipe 11 to generate a rotating air flow to remove deposits, and a pressure sensor 51 is arranged inside each double-wall corrugated main pipe 11 to monitor pressure data of a corresponding pipe section.

[0019] In an embodiment, a vertical gap zone 314 is arranged inside the transition zone 313, a vertical gap of the vertical gap zone 314 is 0.45 mm-0.55 mm, and the gap is configured to generate a self-cleaning structure of a 200-250 Hz vortex pulse.

[0020] In an embodiment, a central controller 53 is included, the central controller 53 is in signal connection with the pressure sensor 51 and the vortex generator 52, the central controller 53 receives real-time pressure data sent by the pressure sensor 51, calculates a resistance trend of the corresponding double-wall corrugated main pipe 11 according to the real-time pressure data, controls the vortex generator 52 of the corresponding double-wall corrugated main pipe 11 to work when the resistance trend exceeds a preset threshold, and the central controller 53 is further configured to control the plurality of vortex generators 52 to be started in a preset time and sequence in turn to perform pulse blowing, and the vortex generator 52 is a compressed air driven vortex generator.

[0021] In an embodiment, the dust separation and collection system 4 comprises a primary cyclone separator 41 and a bag-type dust collector 42, an air inlet of the primary cyclone separator 41 is in communication with the double-wall corrugated main pipe 11 of the underground pipe network 1, a clean gas outlet of the primary cyclone separator 41 is connected to an air inlet of the bag-type dust collector 42, a conical bottom dust discharge port of the primary cyclone separator 41 is provided with a primary dust collection device 43, a dust hopper of the bag-type dust collector 42 is provided with a secondary dust collection device 44, and the bag-type dust collector 42 is connected to an air inlet of the negative pressure generating unit 2 through a front heat exchanger 62.

[0022] In the embodiment: The fiber and dust rich air is sucked from the underground duct network into the system, first into the primary cyclone separator 41, where the majority of the heavier fibers and dust are separated by centrifugal force and sealed out through the bottom rotating discharge valve into the primary dust collector 43. At this point, the main remaining components in the gas are the light, fine fibers and dust that are difficult to remove by centrifugal force, and the gas that has been preliminarily separated but still has a risk of flammability. The gas then enters the pre-heat exchanger 62, which exchanges heat with the high-temperature clean gas from the regenerative thermal oxidizer 61. The gas is heated to 300-400°C in the pre-heat exchanger 62, at which temperature the organic fibers carried in the gas undergo pyrolysis and carbonization reactions, and their physical properties change fundamentally. They lose their stickiness, no longer easily adhere to the pipe wall, and change from flammable organic matter to non-flammable, loose carbon powder. At the same time, any potential fire sources that may be sucked in, such as sparks, will also lose their ignition ability in this process due to rapid heating by the surrounding high-temperature environment. By this point, the elements of combustion and explosion have been fundamentally eliminated before the gas enters the main fan and subsequent devices, achieving intrinsic safety.

[0023] After preheating and carbonization, the gas enters one of the regenerative chambers of the regenerative thermal oxidizer 61 through the switching valve. The gas is further heated to the operating temperature of the regenerative thermal oxidizer 61 as it flows through the regenerative ceramic bed. At this high temperature, the remaining carbon powder, VOCs volatile organic compounds, and other flammable components in the gas react violently with oxygen, and are completely oxidized and decomposed into harmless carbon dioxide CO2 and water vapor H2O. The pure high-temperature gas after oxidation, at about 800°C, will flow through another "cold" regenerative ceramic bed before leaving the regenerative thermal oxidizer 61. The high-temperature clean gas transfers most of its heat to the ceramic regenerator, and its temperature drops to only a few tens of degrees higher than the inlet temperature. The heated regenerator stores energy for preheating the new incoming exhaust gas in the next cycle. Through periodic switching of the switching valve, multiple regenerative chambers alternately undergo heat absorption and heat release processes.

[0024] The clean gas with a temperature of ~150°C is pumped to the chimney by the induced draft fan and is discharged into the atmosphere in compliance with standards. Its composition is mainly N2, CO2, and H2O. From the other side of the pipe of the regenerative thermal oxidizer 61, the medium-high temperature clean gas cooled by the preheated exhaust gas flows out. This part of the gas can further recover its heat energy through additional secondary heat exchange systems such as hot air circulation systems, hot water boilers, ORC power generation systems, etc.

[0025] In one embodiment, the branch pipe interface module 31 is installed with an adaptive electric air valve that is linked to the workshop equipment PLC signal to dynamically adjust the air valve opening according to the equipment start-stop state.

[0026] In one embodiment, the inner layer of the double-wall corrugated main pipeline 11 is provided with a conductive metal corrugated pipe 111, and the outer layer is provided with an HDPE corrugated pipe 112, and the filling between the conductive metal corrugated pipe and the HDPE corrugated pipe is a foamed concrete buffer layer 113.

[0027] In one embodiment, the bottom of the double-wall corrugated main pipeline 11 is provided with a pre-embedded H-shaped steel rail 12.

[0028] In one embodiment, the inside of the upper flow guide 311 is provided with a square grid filter plate, and the inside of the lower flow guide 312 is provided with a hexagonal honeycomb filter plate, and the area ratio of the square to the hexagon is 1.8:1-2.2:1.

[0029] In this embodiment: The system is in normal operation, and the dust-containing airflow uniformly passes through the upper flow guide 311 and the lower flow guide 312. Large-particle cotton and fiber clusters are physically intercepted by the square grid of the upper flow guide and adhere to the grid wires. 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 1.5-2.0 mm, the actual measured local resistance can rise by 30-50%. The airflow follows the principle of "minimum resistance path" and bypasses the blocked grid holes, pouring into the unblocked area and the lower flow guide 312. When the airflow passes through the 0.45mm-0.55mm vertical gap of the vertical gap area 314, the flow rate instantaneously surges, generating periodic and alternating vortex shedding behind it. The vortex shedding frequency (f) is determined by the Strouhal number (St), and the calculation formula is f = (St × V) / d. St is a dimensionless constant, about 0.2 for a cylinder. V is the incoming flow velocity, taken as 28 m / s. d is the diameter of the grid wire. The calculation result is f = (0.2 × 28) / 0.0001 = 56000 Hz. Due to structural damping and flow field complexity, the actual effective transmission frequency is 200-250 Hz, still within the high-frequency vibration range. This high-frequency vibration wave is transmitted to the entire upper flow guide 311 structure through the metal grid wires, especially in the areas where the cotton adheres. Under the continuous high-frequency vibration, the cotton fibers produce fatigue fracture, and the internal fiber bonding force is destroyed. The acceleration generated by the vibration provides sufficient inertial force to the cotton particles, enabling them to overcome the electrostatic adsorption force and van der Waals force on the grid surface and be thrown off the grid surface. The detached cotton blocks are carried away by the main airflow, the grid ventilation area is restored, the local resistance decreases to normal level, the airflow is evenly distributed again, and the next accumulation cycle begins.

[0030] The working principle of the underground negative pressure pipe trench system for textile plant is as follows: the fiber fly and dust generated by the dust generating equipment are sucked into the suction point device 3 under the action of the system global negative pressure generated by the negative pressure generating unit 2, the upper dust-containing airflow first enters the upper flow guide port 311 of the branch pipe interface module 31, the square grid filter plate inside it preliminarily rectifies and diffuses the suction airflow, captures large-particle cotton, and the airflow generates a boundary layer separation to form a low-pressure vortex area when passing through a right angle, so that the light cotton is adsorbed on the edge of the mesh, avoiding the rear-end blockage, the lower layer of dust-containing airflow is rectified by the lower flow guide port 312 of the hexagonal honeycomb filter plate, and after the stable and uniform airflow is formed, the lower layer flow rate is 2.5-3.0 times of the upper layer flow rate; The airflow passing through the upper flow guide port 311 and the lower flow guide port 312 passes through the transition area 313, and the vertical gap area 314 specially arranged in the area generates a specific frequency vortex pulse of 200-250 Hz when the airflow passes through, which plays a self-cleaning role in the module itself, preventing the fiber from adhering and accumulating here; on the other hand, the pulsed airflow can better "wrap" the dust, making it more smoothly enter the branch pipe and flow into the double-wall corrugated main pipe 11 of the underground pipe trench network 1; Under the strong negative pressure provided by the fan, the dust-containing airflow is conveyed at high speed in the double-wall corrugated main pipe, the pressure sensor 51 arranged along the pipe real-time monitors the pressure drop of each pipe section, i.e. the resistance, and transmits the data to the central controller 53, the central controller 53 calculates the resistance trend of each pipe section in real time through an algorithm. When the trend indicates that there is a risk of dust deposition and resistance increase in a pipe section, the system will trigger a warning and automatically start the vortex generator 52 at the bottom of the pipe section, the vortex generator 52 generates a high-speed rotating strong airflow to pulse-blow the pipe bottom, re-rolls the possible deposited dust into the airflow, thereby realizing active and online pipe self-cleaning, fundamentally preventing blockage, and the controller can also arrange all vortex generators to work in turn for preventive maintenance;

[0031] The dust-laden gas first enters the first cyclone separator 41 of the dust separation and collection system 4, and most of the heavy fibers and dust are separated out by the action of centrifugal force and fall into the first dust collection device 43. The gas that has been preliminarily purified then enters the pre-heat exchanger 62, where the low-temperature waste gas is heat-exchanged with the high-temperature clean gas discharged from the regenerative thermal oxidizer 61, and the waste gas is preheated to above 300°C. This process has a dual purpose of intrinsic safety and energy recovery. The intrinsic safety is that the high temperature of the preheated waste gas is sufficient to rapidly carbonize the small and sticky fibers remaining in the waste gas, so that the fibers lose their stickiness and combustibility and are converted into loose and inert carbon powder, thereby completely eliminating the risk of combustion or explosion in the subsequent pipeline, dust collector and fan. The energy recovery is that the preheating greatly reduces the energy required for the subsequent regenerative thermal oxidizer to heat the waste gas to the oxidation temperature, thereby significantly saving energy. The gas after preheating enters the bag dust collector 42, where the fine particulate matter including carbonized powder particles is completely filtered out and collected in the second dust collection device 44. Finally, the gas with extremely high purification degree is extracted by the fan of the negative pressure generating unit 2 and sent to the regenerative thermal oxidizer 61, where the extremely small amount of organic pollutants that may remain in the gas are completely oxidized and decomposed into harmless CO2 and water vapor, and then discharged in compliance with the standard. The heat recovered during the operation of the RTO is used to heat the pre-heat exchanger, forming an efficient energy cycle.

[0032] The central controller 53 is the brain of the entire system, which intelligently decides the frequency and timing of the vortex cleaning according to the feedback of the pressure sensors of the pipe sections. At the same time, it is linked with the adaptive electric air valve installed in the branch pipe interface module 31 and the PLC system of the production equipment in the workshop, and obtains the real-time state of the equipment start-stop. When a piece of equipment is stopped, the corresponding air valve is automatically adjusted to be smaller or closed, and the air volume is redistributed to the equipment that is running, so as to realize "on-demand distribution" and greatly reduce the energy consumption of the system.

[0033] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and modifications can be made to the embodiments without departing from the principles and spirits of the present application, and the scope of the present application 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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