Fusible smoke outlet-water curtain partition type coal conveying trestle smoke discharging and controlling system

Abstract

The invention relates to a fusible smoke outlet-water curtain partition type coal conveying trestle smoke discharging and controlling system which comprises a coal conveying trestle, a water curtain spray head, fusible smoke outlets, a fire detection alarm, smoke outlet water spray heads, a water conveying pipeline and an FAS system. The water curtain spray heads are arranged on the ceiling of the coal conveying trestle close to the fusible smoke outlets, the smoke outlet water spray heads are arranged on the sides, opposite to the coal conveying trestle, of the fusible smoke outlets, and A is 10-20 m. The method of combining the water curtains and the smoke exhaust system is adopted, under the condition of the same smoke exhaust configuration, the smoke exhaust efficiency is improved, the size of a fireproof zone is controlled through the distance between the water curtains, high-temperature smoke in the fireproof zone is exhausted through the synergistic effect of the water curtains and the fusible heat exhaust ports, and the cooling efficiency and the heat insulation efficiency in the trestle are effectively improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of trestle smoke exhaust, in particular to a meltable smoke exhaust port-water curtain partition type coal conveying trestle smoke exhaust and control system. BACKGROUND

[0002] The coal conveying trestle is an important material conveying equipment of an enterprise, which is used for conveying combustible materials such as coal, coke, petroleum coke and biomass particles. Due to the requirements of environmental protection policies, the coal conveying trestle is usually closed or semi-closed, and coal dust is easy to accumulate inside. When the coal dust is in a specific concentration range and meets an ignition source, dust explosion may occur, which may aggravate the destructive power of fire. In addition, coal may be thermally decomposed to produce flammable gas under high temperature, which may be combusted under certain conditions. The coal conveying trestle has the characteristics of small cross-sectional area and closed or semi-closed structure due to its simple internal structure and lack of mechanical smoke exhaust facilities compared with other buildings. Compared with the tunnel and other corridor buildings, the coal conveying trestle has the characteristic of large slope (usually more than 15°, even higher, while the slope of the tunnel is usually not more than 5°). This structural characteristic leads to more significant chimney effect of the coal conveying trestle and faster fire spread when a fire occurs. The accelerated fire spread makes the fire spread on the uphill direction extremely violent, so it is of great practical significance to study the temperature field distribution and water curtain temperature control efficiency of the coal conveying trestle. If the high-temperature smoke inside the trestle cannot be discharged in time when a fire occurs, the trestle may collapse as a whole, which may affect the continuity of production and cause casualties. At present, many trestles adopt longitudinal smoke exhaust method. The existing technology studies the synergistic effect of longitudinal ventilation and water curtain system in temperature reduction. However, in actual engineering, the smoke exhaust efficiency of the smoke exhaust port is very low when the smoke spreads longitudinally in the trestle, which cannot effectively remove the smoke generated by the fire, and the temperature control in the trestle is poor. Therefore, it is of great engineering significance to study the fire prevention and control of the coal conveying trestle. SUMMARY

[0003] The technical problem to be solved by the present application is to overcome the problems of low smoke exhaust efficiency and poor temperature control efficiency.

[0004] The technical scheme for solving the above technical problem is as follows: a meltable smoke exhaust port-water curtain partition type coal conveying trestle smoke exhaust and control system, comprising a coal conveying trestle, a water curtain nozzle, a meltable smoke exhaust port, a fire detection alarm, a smoke exhaust port water nozzle, a water conveying pipeline and a FAS system. The meltable smoke exhaust ports are arranged at equal intervals along the longitudinal direction of the top ceiling of the coal conveying trestle at a distance A. The water curtain nozzles are arranged on the top ceiling of the coal conveying trestle close to the meltable smoke exhaust ports. The smoke exhaust port water nozzles are arranged on the side opposite to the coal conveying trestle of each meltable smoke exhaust port. A is 10-20 m. The water curtain nozzle and the smoke outlet nozzle are communicated with the water pipeline through a branch pipe, and a control valve is arranged on the branch pipe. The FAS system is connected with the fire detection alarm, receives the alarm signal of the fire detection alarm, determines the position of the fire source, finds out the water curtain nozzles with a distance of 20 m from the nearest fusible smoke outlet upstream and downstream of the fire source as the preferred water curtain nozzles, and sends a command to open the preferred water curtain nozzles and the smoke outlet nozzle corresponding to other fusible smoke outlets between the preferred water curtain nozzles and the nearest fusible smoke outlets upstream and downstream of the fire source.

[0005] The water curtain nozzles are arranged in the middle of the top of the coal conveying bridge between adjacent fusible smoke outlets.

[0006] Further, A is 10 m, the FAS system finds out the water curtain nozzles with a distance of 25 m from the nearest fusible smoke outlet upstream and downstream of the fire source as the preferred water curtain nozzles.

[0007] The water curtain nozzles adopt a 3-row or 2-row parallel structure.

[0008] The fusible smoke outlet is made of a material that can self-melt at 120-150 DEG C without producing molten droplets.

[0009] The size of the fusible smoke outlet is 1 m x 2 m.

[0010] The fire detection alarm adopts a cable type temperature sensing optical cable, which is wound around the position near the belt conveyor, and when the temperature of a certain place of the belt conveyor exceeds the alarm threshold of the temperature sensing optical cable, the fire detection alarm automatically sends an alarm to the FAS system.

[0011] A fusible smoke outlet-water curtain partition type coal conveying bridge smoke exhaust and control method, comprising the following steps: when the temperature of a certain place of the belt conveyor exceeds the alarm threshold of the temperature sensing optical cable, the fire detection alarm sends an alarm to the FAS system. The FAS system determines the position of the fire source, finds out the water curtain nozzles with a distance of 20-25 m from the nearest fusible smoke outlet upstream and downstream of the fire source as the preferred water curtain nozzles, and sends a command to open the preferred water curtain nozzles and the smoke outlet nozzle corresponding to other fusible smoke outlets between the preferred water curtain nozzles and the nearest fusible smoke outlets upstream and downstream of the fire source. The coal conveying trestle is divided into smoke control partitions by the water curtain formed by the water curtain nozzles, and when the temperature of the nearest fusible smoke exhaust port upstream and downstream of the fire source exceeds 120 DEG C, the fusible smoke exhaust port is melted to form a smoke exhaust port, and the fusible smoke exhaust port between the smoke exhaust port and the water curtain nozzle is cooled by the water jet of the smoke exhaust port nozzle to avoid the opening of the melting head.

[0012] The beneficial effects of the present application are: the present application adopts the method of combining water curtain and smoke exhaust system, which improves the smoke exhaust efficiency, reduces the smoke influence range, effectively controls the smoke diffusion range, and effectively improves the cooling efficiency and heat insulation efficiency in the trestle. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 The structure diagram of the present application is shown in the figure; Figure 2 The schematic top view of the arrangement of the trestle roof thermocouple and water curtain nozzle is shown in the figure; Figure 3 The side view of the temperature and heat radiation detector is shown in the figure; Figure 4 The heat insulation efficiency of different simulation conditions is shown in the figure; Figure 5 The cooling efficiency of different simulation conditions is shown in the figure; Figure 6 The temperature field distribution of the fire source on both sides of the coal conveying trestle under mode two working condition is shown in the figure. DETAILED DESCRIPTION

[0014] The principles and characteristics of the present application are described below in combination with the drawings, and the examples are only used to explain the present application and are not used to limit the scope of the present application.

[0015] Example 1 The flexible water curtain-fusible heat exhaust port parameter simulation is carried out on the slope coal conveying trestle to obtain the optimal design parameters of the flexible water curtain and fusible smoke exhaust port of the coal conveying trestle (1) Trestle model and fire source setting A full-scale simulation model was established by FDS numerical simulation software, taking a single-line coal conveying trestle in a steel plant as the research object. The trestle is 300 m long, and the whole trestle is a steel structure. The steel wall is 0.1 m thick, 2.2 m high, 4.5 m wide, and 17° slope (the actual investigation shows that the slope of the coal conveying trestle is usually not more than 17°, and when the slope is 17°, the smokestack effect of the coal conveying trestle is the most significant after the fire occurs). The conveyor belt is located at the longitudinal center line of the trestle, and the fire source is set at the longitudinal center 50 m away from the bottom end, with the size (length × width × height) of 1 m × 1.5 m × 0.5 m. The belt material is PVC, and the maximum fire source power of PVC conveyor belt fire is set according to the previous research, with the fire source power of 2 MW and the fire type of fast t 2 fire growth coefficient = 0.046 9 kJ / s 2 .

[0016] According to the size of the trestle, the calculation area (length × width × height) is determined to be 300 m × 4.5 m × 2.2 m. The grid is 1 / 4~1 / 16 of the characteristic size of the flame, which is calculated by formula (1) to be 1.27 m. The grid size δ is in the range of 0.0794~0.3175, so the size grid of 0.1 m and 0.125 m is adopted. The area sensitive to temperature of the model (i.e. within 10 m of the fire source) is encrypted, with the grid size of 0.1 m × 0.1 m, and the grid size of the remaining area is 0.125 m × 0.125 m.

[0017] (1) In the formula: is the characteristic size of the flame; is the heat release rate of the fire source, 2 MW; is the environmental density, 1.2 kg / m 3 ; is the specific heat capacity of the environment, 1000 J / (kg·K); is the environmental temperature, 293 K; is the acceleration of gravity, 9.8 m / s 2 .

[0018] The two ends of the coal conveying trestle are open, and the initial temperature is 20℃. The longitudinal smoke temperature measuring points are set at 0.1 m below the trestle roof with XY plane distribution. The environmental temperature in the trestle reaches a steady state after 300 s of fire occurrence, so the average value in the interval of 300~320 s is selected. The measuring points are symmetrically distributed every 0.1 m on the center line of the trestle and 50 m on both sides of the fire source, as shown in Figure 2 ​​As shown. In addition, longitudinal temperature measuring points distributed along the XY plane are set at intervals of 0.1 m to detect the longitudinal distribution of flue gas and temperature on the walls of the trestle roof, as shown. Figure 3 As shown.

[0019] According to the relevant provisions of the "Code for Design of Automatic Sprinkler Systems" GB 50084-2017, the rated parameters of the water curtain system are: water spray intensity of 2.0 L / (s·m); sprinkler head working pressure of 0.1 MPa. The water curtain sprinklers are installed on the top / side wall of the coal conveyor trestle, using a 2 / 3 row design, with a water curtain width of 6m. The exhaust vent at the top of the coal conveyor trestle is set as an exhaust boundary, i.e., an extraction type exhaust. The ports on both sides of the trestle are open boundaries. The exhaust vents are located on the top / side of the coal conveyor trestle and are established through holes in the FDS (Fire Discharge System). The location and size of the exhaust vents are set according to different working conditions.

[0020] (2) Simulation of water curtain parameters, distance between water curtain and smoke exhaust outlet, and smoke exhaust outlet size parameters The following operating conditions were set up: 1. Water curtain acting alone without smoke exhaust outlets (Mode 1); 2. Smoke exhaust outlet acting alone without water curtain (Mode 2); 3. Water curtain and smoke exhaust outlet acting in tandem (Mode 3). The temperature field distribution of flue gas in the roof of the coal conveyor trestle and its exceeding the fire protection boundary were investigated under these two modes. 4. Smoke exhaust outlet spacing was changed (Mode 4); 5. Smoke exhaust outlet size was changed (Mode 5). The temperature control effect of the combined action of water curtain and smoke exhaust outlets under different operating conditions was investigated. Based on the simulation scheme designed according to the steps, the influence of smoke exhaust outlet parameter settings on the fire extinguishing and cooling effect of the water curtain was investigated. Comparative operating conditions were set up, as shown in Table 1, and simulation verification was performed.

[0021] Table 1 Numerical Simulation Operating Condition Settings Table Calculate the insulation efficiency η under different simulated operating conditions T and cooling efficiency η η T =(T1-T2) / T1; T1 is the initial air temperature (°C) of a specific area before the water curtain is applied; T2 is the final air temperature (°C) of the same area after the water curtain is applied. ; The temperature in the same area decreases after the water curtain effect; The air mass flow rate at the exhaust outlet is (kg / s). The specific heat capacity of air ([J / (kg·K)]); The air temperature inside the trestle (K); The temperature (K) of the air discharged from the exhaust port; The evaporation rate of the water curtain is (kg / s). Latent heat of evaporation of water (J / kg).

[0022] Convective mass transfer coefficient (m / s); A is the surface area of the water curtain (m 2 ); Density of water vapor in saturated state (kg / m 3 ); Density of water vapor in ambient air (kg / m 3 ); The influence of changing the water curtain spacing on the heat insulation and cooling effect of the water curtain system in the coal conveying gallery is shown in Figure 4 and Figure 5 . The results show that under the condition of shortening the water curtain spacing, the temperature control effect of the system can be significantly improved. However, when the water curtain spacing is shortened to the range of 30m~40m, further shortening the spacing does not bring obvious effect improvement, indicating that there is an optimal water curtain spacing interval, which can guarantee the temperature control effect of the water curtain system.

[0023] Further analysis shows that the effect of three rows of water curtain nozzles is better than that of two rows of water curtain nozzles; compared with installing the nozzles on the side, installing the nozzles on the top is better. Therefore, two important conclusions can be drawn, first, reasonable setting of water curtain system spacing is the key to maximizing and guaranteeing the temperature control effect; second, when the water curtain spacing is reduced from 80m to 60m, the heat insulation and cooling efficiency is significantly improved, but when it is further reduced from 60m to 30m, the change range of the temperature control effect is not obvious. Therefore, the water curtain spacing of 60m is better.

[0024] It can be seen from Figure 6 that when the water curtain system spacing is shortened, the range of the ceiling flue gas temperature exceeding 120℃ in the coal conveying gallery also becomes smaller, and the length of the ceiling flue gas temperature exceeding 120℃ is 21.5m when the water curtain system is not opened, and is reduced to 4.2m after the water curtain system is opened. Therefore, appropriately shortening the water curtain system spacing can effectively reduce the temperature in the coal conveying gallery, but too small water curtain system spacing may also cause problems of water resource waste and cost increase.

[0025] Table 2 is a comparison of the heat insulation and cooling effect under 7 different working conditions. Working condition A1 is without water curtain and without exhaust port, working condition A2 is with water curtain and without exhaust port, and working conditions A3~A7 are different spacing between water curtain and exhaust port.

[0026] Table 2 numerical simulation results When the distance between the water curtain and the smoke outlet is increased from 5 m to 25 m while the size of the smoke outlet remains unchanged, the range of the ceiling smoke temperature exceeding 120℃ is reduced by 9.3 m, 9.7 m, 10.7 m, 11.1 m, 14.1 m, respectively; the maximum improvement of the heat insulation efficiency is 4.45%; the maximum improvement of the cooling efficiency is 8.61%; compared with the water curtain alone in working condition A2, the maximum improvement of the heat insulation efficiency is 11.06%; the maximum improvement of the cooling efficiency is 24.55%; compared with the water curtain alone, the maximum reduction of the range of the ceiling smoke temperature exceeding 120℃ is 6.2 m. It can be seen that the water curtain and the smoke outlet have a better temperature control effect in cooperation; the greater the distance between the water curtain and the smoke outlet, the more smoke that can be discharged from the smoke outlet, rather than more water vapor competing with the smoke to be discharged from the smoke outlet, so the temperature inside the trestle is lower. The water curtain and the smoke outlet are both key factors affecting the temperature control effect of the coal conveying trestle, and the temperature control effect is better when the water curtain and the smoke outlet cooperate than when the water curtain alone; when the distance between the water curtain and the smoke outlet is increased, the high-temperature smoke is more easily discharged in time. When the distance between the water curtain and the smoke outlet reaches an optimal distance range, further increasing the distance will not significantly improve the temperature control effect. It can be seen that the distance between the smoke outlet and the water curtain is about 25 m, and the temperature control is optimal.

[0027] Table 3 is the ceiling smoke temperature field distribution in the coal conveying trestle under different working conditions. Working condition B1 is without a water curtain and a smoke outlet, working condition B2 is with a water curtain but without a smoke outlet, and working conditions B3-B7 are different smoke outlet sizes. As can be seen from the figure, the size of the smoke outlet is also a key factor affecting the temperature control effect of the coal conveying trestle. According to the analysis of the numerical simulation results in Table 3, when the distance between the smoke outlet and the water curtain remains unchanged, the size of the smoke outlet is increased from 1×0.5 m to 1×2.5 m, the range of the ceiling smoke temperature exceeding 120℃ is reduced by 8.7 m, 11.4 m, 12.1 m, 13.3 m, 14.2 m, respectively; the maximum improvement of the heat insulation efficiency is 11.11%, and the maximum improvement of the cooling efficiency is 10.1%; compared with the water curtain alone in working condition B2, the maximum improvement of the heat insulation efficiency is 15.93%, and the maximum improvement of the cooling efficiency is 27.38%; the maximum reduction of the range of the ceiling smoke temperature exceeding 120℃ is 6.4 m. It can be seen that increasing the size of the smoke outlet is beneficial to improving the temperature control efficiency. It can be seen that when the water curtain system and the smoke outlet cooperate, the water curtain system forms a relatively cool area for absorbing heat and reducing temperature, and appropriately increasing the size of the smoke outlet can improve the rate of high-temperature smoke passing through the smoke outlet, so that the hot gas flow can be effectively discharged in time, thereby improving the cooling and heat insulation effect of the entire system. It is recommended to select a smoke outlet size of 1 m×2 m, and the temperature control effect is optimal.

[0028] Table 3 Numerical simulation results Example 2 As Figure 1As shown, a kind of coal conveying trestle smoke exhaust and smoke control system of water curtain partition type includes coal conveying trestle 4, water curtain nozzle 1, fusible smoke exhaust port 3, fire detection alarm 5, smoke exhaust port water nozzle 6, water pipeline, FAS system, fusible smoke exhaust port 3 is arranged equidistantly along the longitudinal direction of the roof of coal conveying trestle 4 by distance A, water curtain nozzle 1 is arranged in the middle between adjacent fusible smoke exhaust port 3 or on the roof of coal conveying trestle 4 close to fusible smoke exhaust port 3, smoke exhaust port water nozzle 6 is arranged on the side of each fusible smoke exhaust port 3 away from coal conveying trestle 4, and A is 10-20m.

[0029] Water curtain nozzle 1 and smoke exhaust port water nozzle 6 are communicated with water pipeline through branch pipe, control valve is arranged on the branch pipe, water curtain nozzle 1 can spray to form water curtain covering the cross section of coal conveying trestle 4, and smoke exhaust port water nozzle 6 can spray to form water film on the side of fusible smoke exhaust port 3 away from coal conveying trestle 4.

[0030] Water curtain nozzle 1 adopts multi-row design. Preferably, the effect of three rows of water curtain nozzles is better than that of two rows of water curtain nozzles; Further, the size of fusible smoke exhaust port 3 is 1m*2m. Fusible smoke exhaust port 3 can be made of material that can self-melt at 120-150 DEG C without producing molten droplets, to exhaust smoke and heat in fire scene. When fusible smoke exhaust port 3 is not melted, it makes coal conveying trestle 4 form a closed channel As a first embodiment, A is 10m, water curtain nozzle 1 and fusible smoke exhaust port 3 are staggered, and water curtain nozzle 1 is arranged in the middle of the roof of coal conveying trestle 4 between adjacent fusible smoke exhaust port 3.

[0031] FAS system is connected with fire detection alarm 5, to receive alarm signal of fire detection alarm 5, and fire detection alarm 5 used in coal conveying trestle 4 is mainly cable type linear temperature sensing optical cable, to be wound around the position near belt conveyor, when the temperature of certain place of belt machine exceeds the alarm threshold of temperature sensing optical cable, fire detection alarm 5 automatically sends alarm to FAS system.

[0032] FAS system determines the position of fire source, finds out preferred water curtain nozzle on both sides of upstream and downstream of fire source, and the preferred water curtain nozzle is water curtain nozzle 1 with the distance of 25m from fusible smoke exhaust port 3 closest to upstream and downstream of fire source, FAS system sends command to open preferred water curtain nozzle respectively, and sends command to open smoke exhaust port water nozzle 6 corresponding to other fusible smoke exhaust port 3 between preferred water curtain nozzle and fusible smoke exhaust port 3 closest to upstream and downstream of fire source; The water curtain formed by preferred water curtain nozzle covering the cross section of coal conveying trestle 4 is divided into smoke control subarea, and fusible smoke exhaust port 3 closest to upstream and downstream of fire source is melted when the temperature exceeds 120 DEG C, to form smoke exhaust port, and the fusible smoke exhaust port 3 between smoke exhaust port and preferred water curtain nozzle is cooled by smoke exhaust port water nozzle 6 to avoid melting.

[0033] In the first embodiment, the water curtain nozzle 1 can also be arranged directly on the top of the coal conveying trestle 4 near the meltable smoke outlet 3. In this case, the FAS system determines the location of the fire source, and the preferred water curtain nozzle is the water curtain nozzle 1 that is 20 m away from the meltable smoke outlet 3 upstream and downstream of the fire source.

[0034] As the second embodiment, A is 20 m, and the water curtain nozzle 1 is arranged on the top of the coal conveying trestle 4 near the meltable smoke outlet 3. In this case, the FAS system determines the location of the fire source, and the preferred water curtain nozzle is the water curtain nozzle 1 that is 20 m away from the meltable smoke outlet 3 upstream and downstream of the fire source.

[0035] The FAS system sends a command to open the preferred water curtain nozzle, and sends a command to open the smoke outlet nozzle 6 corresponding to the other meltable smoke outlets 3 between the preferred water curtain nozzle and the meltable smoke outlet 3 upstream and downstream of the fire source. The water curtain formed by the preferred water curtain nozzle on the coal conveying trestle 4 separates the coal conveying trestle 4 into a smoke control partition. When the temperature of the meltable smoke outlet 3 near the upstream and downstream of the fire source exceeds 120℃, the meltable smoke outlet 3 melts to form a smoke outlet. The meltable smoke outlet 3 between the preferred water curtain nozzle and the smoke outlet is cooled by the smoke outlet nozzle 6 to avoid melting.

[0036] Although the embodiments of the present application have been shown and described above, it should be understood that the above-described embodiments are exemplary and are not to be construed as limiting the present application, and those of ordinary skill in the art can make changes, modifications, replacements and variations to the above-described embodiments within the scope of the present application.

Claims

1. A fusible flue gas outlet-water curtain partition type coal conveying trestle flue gas control system, characterized in that, It includes a coal conveying trestle, water curtain nozzles, fusible smoke vents, fire detectors and alarms, smoke vent water nozzles, water supply pipelines, and a FAS system. The fusible smoke vents are arranged at equal intervals of distance A along the longitudinal direction of the coal conveying trestle roof. The water curtain nozzles are arranged on the coal conveying trestle roof near the fusible smoke vents. The smoke vent water nozzles are arranged on the side of each fusible smoke vent facing away from the coal conveying trestle. A is 10~20m. The water curtain nozzles and flue gas nozzles are connected to the water supply pipeline through branch pipes. The branch pipes are equipped with control valves. The water curtain nozzles can spray to form a water curtain covering the cross section of the coal conveying bridge. The flue gas nozzles can spray to form a water film on the side of the fusible flue gas outlet facing away from the coal conveying bridge. The FAS system connects to the fire detector and alarm to receive alarm signals from the fire detector and determine the location of the fire source. It then identifies water curtain nozzles located 20m away from the nearest fusible smoke exhaust outlets upstream and downstream of the fire source as preferred water curtain nozzles. The FAS system issues commands to activate the preferred water curtain nozzles and to activate the corresponding smoke exhaust nozzles at other fusible smoke exhaust outlets between the preferred water curtain nozzles and the nearest fusible smoke exhaust outlets upstream and downstream of the fire source.

2. The smoke control system for a fusible flue gas outlet-water curtain type coal conveying trestle according to claim 1, characterized in that, The water curtain nozzles are centrally located on the roof of the coal conveying trestle between adjacent fusible flue gas outlets.

3. The smoke control system for a fusible flue gas outlet-water curtain partition type coal conveying trestle according to claim 2, characterized in that, A is 10m. The FAS system finds water curtain nozzles with a distance of 25m from the nearest fusible smoke outlet on both the upstream and downstream sides of the fire source, and selects them as preferred water curtain nozzles.

4. The smoke control system for a fusible flue gas outlet-water curtain partition type coal conveying trestle according to claim 1, characterized in that, The water curtain nozzles are arranged in a 3-row or 2-row parallel structure.

5. A flexible water curtain and fusible smoke extraction device for a trestle bridge according to claim 1, characterized in that, The fusible exhaust port is made of a material that can melt on its own at 120℃~150℃ without producing molten droplets, forming a light-transmitting window.

6. A flexible water curtain and fusible smoke extraction device for a trestle bridge according to claim 1, characterized in that, The dimensions of the fusible exhaust port are 1m × 2m.

7. The smoke extraction method for a flexible water curtain and fusible smoke extraction device for a trestle bridge as described in claim 1, characterized in that, The fire detector uses a cable-type linear temperature-sensing optical cable, which is wrapped around the belt conveyor. When the temperature at a certain point on the belt conveyor exceeds the alarm threshold of the temperature-sensing optical cable, the fire detector automatically sends an alarm to the FAS system.

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