Circulating heat supply system of fire-fighting main pipeline in tunnel

Abstract

The utility model discloses a circulating heat supply system of a fire-fighting main pipeline in a tunnel, which comprises the fire-fighting main pipeline, a first water inlet and a second water inlet are arranged on the fire-fighting main pipeline, the fire-fighting main pipeline is connected with a fire hydrant through a branch pipeline, and the first water inlet and the second water inlet are arranged on the fire-fighting main pipeline. The circulating heat supply device is respectively communicated with the first water inlet and the second water inlet through a water inlet pipeline; the fire pool is connected with the water inlet pipeline. By arranging the circulating heat supply device, heat can be directly supplied to water flowing through the fire-fighting main pipeline, energy consumption is effectively reduced, on one hand, more energy is saved, on the other hand, the operation cost can be reduced, and economical efficiency is improved; through connection of the fire pools and switching of the valves, it can be guaranteed that water supply in the main fire pipeline is sufficient when a fire occurs, and then timeliness and reliability of fire extinguishing in the main fire pipeline are guaranteed.

Description

Technical Field

[0001] This utility model relates to the technical field of tunnel fire protection systems, and in particular to a circulating heating system for the main fire protection pipeline in a tunnel. Background Technology

[0002] Seasonal low temperatures in highway tunnels in cold regions cause problems such as freezing of water sources and pipe networks in tunnel fire protection systems, which greatly affects the fire safety of tunnel operations during winter and creates significant fire safety liability issues. Among related technologies, the traditional method of electric heat tracing supplemented with insulation to maintain the temperature of fire protection pipes above the freezing point is costly, places a heavy burden on maintenance departments, has unstable performance, and is difficult and ineffective for maintenance departments. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art or related technologies.

[0004] In view of this, the present invention provides a circulating heating system for the main fire-fighting pipeline in a tunnel, wherein the existing electric heat tracing of the fire-fighting main pipeline is replaced by a circulating heating device, which can solve the problem of freezing damage to the fire-fighting system in cold winters. Compared with the existing technology, it is more energy-efficient and can reduce operating costs.

[0005] Specifically, the following technical solutions are included:

[0006] This utility model provides a circulating heating system for the main fire-fighting pipeline in a tunnel.

[0007] The circulating heating system of the main fire-fighting pipeline in the tunnel includes:

[0008] The fire-fighting main pipeline is connected to fire hydrants via branch pipelines, and the fire-fighting main pipeline is equipped with a first water inlet and a second water inlet;

[0009] The circulating heating device is connected to the first water inlet and the second water inlet respectively through water inlet pipes;

[0010] A fire-fighting water tank is connected to the water inlet pipe.

[0011] Optionally, the water inlet pipe includes a first water inlet pipe, a second water inlet pipe, and a third water inlet pipe; the main fire-fighting pipeline includes a first pipe, a third pipe, a second pipe, and a fourth pipe connected in sequence; the first pipe and the second pipe are connected to fire hydrants via branch pipes; the first water inlet is connected to the second water inlet pipe; the second water inlet is connected to one end of the third water inlet pipe; the third water inlet pipe and the second water inlet pipe are connected via the first water inlet pipe; after the water from the first water inlet pipe enters the circulating heating device for heating, it enters the main fire-fighting pipeline through the third water inlet pipe; the fire-fighting water tank is connected to the second water inlet pipe.

[0012] When the tunnel is a twin-tube tunnel, the twin-tube tunnel includes a first tunnel and a second tunnel, the first pipe is located at the bottom corner of the side wall of the first tunnel, and the second pipe is located at the bottom corner of the side wall of the second tunnel; when the tunnel is a single-tube tunnel, the first pipe and the second pipe are located at the bottom corners of the side walls of the tunnel respectively.

[0013] Optionally, multiple first temperature sensors are installed inside the tunnel, a third temperature sensor is installed outside the tunnel, and multiple second temperature sensors are installed inside the main fire-fighting pipeline. One second temperature sensor is installed at each of the first and second water inlets. The temperature change along the outer edge of the main fire-fighting pipeline is predicted based on the monitoring values ​​of the first and third temperature sensors, and the opening, heating temperature, and flow rate of the circulating heating device are controlled according to the temperature change. The heating temperature and flow rate of the circulating heating device are corrected according to the monitoring values ​​of the second temperature sensors.

[0014] Optionally, a fifth solenoid valve is provided on the first pipe, and the fifth solenoid valve is located between the third water inlet pipe and the second water inlet pipe, and a fourth solenoid valve is provided between the first water inlet pipe and the third water inlet pipe.

[0015] Optionally, the first inlet pipe connects to the fifth pipe and then enters the circulating heating device. The water after passing through the circulating heating device connects to the third inlet pipe through the sixth pipe. The fourth solenoid valve is located between the fifth pipe and the sixth pipe.

[0016] Optionally, the sixth pipe is equipped with a third solenoid valve, and the fifth pipe is equipped with a first solenoid valve.

[0017] Optionally, the second water inlet pipe is connected to the fire water tank through a first connecting pipe and a third connecting pipe. A fire pump is installed on the first connecting pipe, and a pressure stabilizing pump is installed on the third connecting pipe. The power of the fire pump is greater than the power of the pressure stabilizing pump.

[0018] Optionally, the circulating heating system of the main fire-fighting pipeline in the tunnel also includes a pressure stabilizing tank, which is located at one end of the first water inlet pipeline near the fire-fighting water tank.

[0019] Optionally, when the tunnel length is greater than the first distance, multiple circulation sections are set in the tunnel, each circulation section including a fire-fighting main pipeline and a circulation heating device, and the first distance is 5km to 6km.

[0020] This utility model provides a circulating heating system for a fire-fighting main pipeline in a tunnel. The system includes a main fire-fighting pipeline installed within the tunnel, with a first inlet and a second inlet. A circulating heating device is connected to both inlets via inlet pipes. When the temperature drops, the circulating heating device is activated, and its pump circulates the water in the main fire-fighting pipeline. Water from the inlet pipe enters the circulating heating device, is heated, and then re-enters the main fire-fighting pipeline. This process creates a circulation of water within the main fire-fighting pipeline, achieving the goal of heating the water. This cycle repeats, preventing the water in the main fire-fighting pipeline from freezing. The circulating heating device directly heats the water flowing through the main fire-fighting pipeline, effectively reducing energy consumption. This not only saves energy but also lowers operating costs and improves economic efficiency. By connecting the fire water tank and switching the valves, it is possible to ensure a sufficient water supply in the main fire pipeline when a fire occurs, thereby ensuring the timeliness and reliability of fire extinguishing in the main fire pipeline.

[0021] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of a circulating heating system for a main fire-fighting pipeline in a tunnel according to an embodiment of the present invention;

[0024] Figure 2This is a schematic diagram of a conventional voltage regulation condition according to an embodiment of the present invention;

[0025] Figure 3 This is a schematic diagram of a circulating heating and pressure stabilization operation according to an embodiment of the present invention;

[0026] Figure 4 This is a schematic diagram of a fire protection operation according to an embodiment of the present invention.

[0027] in, Figures 1 to 4 The correspondence between the reference numerals and component names in the attached drawings is as follows:

[0028] 100. Circulating heating system for the main fire-fighting pipeline in the tunnel; 101. First pipeline; 102. Second pipeline; 103. Third pipeline; 104. Fourth pipeline; 105. Fifth pipeline; 106. Sixth pipeline; 107. First water inlet pipeline; 108. Second water inlet pipeline; 109. Circulating heating device; 110. Fire water tank; 111. First solenoid valve; 112. Second solenoid valve; 113. Third solenoid valve; 114. Fourth solenoid valve; 115. Fifth solenoid valve; 116. Pressure stabilizing tank; 117. First connecting pipeline; 119. Third connecting pipeline; 120. Third water inlet pipeline; 121. Fire pump; 122. Pressure stabilizing pump; 123. Pressure switch; 124. First rising stem gate valve; 125. Butterfly valve; 126. Second rising stem gate valve; 201. First tunnel; 202. Second tunnel; 203. Fire hydrant. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0030] Before providing a further detailed description of the embodiments of this utility model, the directional terms used in the embodiments of this utility model, such as "upper part", "lower part" and "side part", do not have the meaning of limiting the scope of protection of this utility model.

[0031] To make the technical solution and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0032] Figure 1 This is a schematic diagram of a circulating heating system for a main fire-fighting pipeline in a tunnel according to an embodiment of the present invention.

[0033] like Figure 1As shown, one embodiment of this utility model provides a circulating heating system 100 for a main fire-fighting pipeline in a tunnel.

[0034] The circulating heating system 100 of the main fire-fighting pipeline inside the tunnel includes:

[0035] The main fire-fighting pipeline is connected to fire hydrants 203 via branch pipelines. The main fire-fighting pipeline is equipped with a first water inlet and a second water inlet.

[0036] The circulating heating device 109 is connected to the first water inlet and the second water inlet respectively through the water inlet pipe;

[0037] Fire water tank 110 is connected to the water inlet pipe.

[0038] The circulating heating system 100 for the main fire-fighting pipeline within the tunnel includes a main fire-fighting pipeline installed inside the tunnel. The main fire-fighting pipeline has a first inlet and a second inlet. A circulating heating device 109 is connected to both inlets via inlet pipes. When the temperature drops, the circulating heating device 109 is activated. Its pump circulates the water in the main fire-fighting pipeline, drawing water from the inlet pipe into the circulating heating device 109. The heated water then re-enters the main fire-fighting pipeline, and so on, creating a circulation system that heats the water within the pipeline. This process repeats continuously, preventing the water in the main fire-fighting pipeline from freezing. The circulating heating device 109 directly heats the water flowing through the main fire-fighting pipeline, effectively reducing energy consumption. This not only saves energy but also lowers operating costs and improves economic efficiency. By connecting the fire water tank 110 and switching the valves, a sufficient water supply can be ensured in the main fire pipeline during a fire, thereby guaranteeing the timeliness and reliability of fire extinguishing within the main fire pipeline. Details are as follows.

[0039] Specifically, the fire water in the main fire pipeline formed by the circulating heating device 109 and valve control in this application is directly circulated and heated, avoiding water storage and corresponding connecting pipes. On the one hand, this eliminates the heat loss of the insulated water tank for storing hot water, and on the other hand, it reduces the length of the pipeline, which can reduce the travel path of the circulating heating device 109 in the pipeline after heating the water, thereby reducing heat loss and improving the efficiency of heat transfer. The heat loss of the circulating heating device and its connecting pipes is reduced, which reduces the energy consumption of the circulating heating system 100 of the main fire pipeline in the tunnel, which is conducive to energy conservation and emission reduction requirements.

[0040] In one feasible implementation, the water inlet pipes include a first water inlet pipe 107, a second water inlet pipe 108, and a third water inlet pipe 120; the main fire-fighting pipeline includes a first pipe 101, a third pipe 103, a second pipe 102, and a fourth pipe 104; the first pipe 101 and the second pipe 102 are connected to fire hydrants 203 via branch pipes; the first water inlet is connected to the second water inlet pipe 108; the second water inlet is connected to one end of the third water inlet pipe 120; the third water inlet pipe 120 and the second water inlet pipe 108 are connected via the first water inlet pipe 107; after the water from the first water inlet pipe 107 is heated by the circulating heating device 109, it enters the main fire-fighting pipeline via the third water inlet pipe 120; the fire-fighting water tank 110 is connected to the second water inlet pipe 108.

[0041] When the tunnel is a twin-tube tunnel, the twin-tube tunnel includes a first tunnel 201 and a second tunnel 202. The first pipe 101 is located at the bottom corner of the side wall of the first tunnel 201, and the second pipe 102 is located at the bottom corner of the side wall of the second tunnel 202. When the tunnel is a single-tube tunnel, the first pipe 101 and the second pipe 102 are located at the bottom corners of the two side walls of the tunnel, respectively.

[0042] When the tunnel is a twin-tunnel, the circulating heating system 100 of the main fire-fighting pipeline in the tunnel includes a main fire-fighting pipeline installed in both tunnels. The main fire-fighting pipeline includes a first pipeline 101, a third pipeline 103, a second pipeline 102, and a fourth pipeline 104 connected in sequence. The first pipeline 101 and the second pipeline 102 are respectively installed in both tunnels. In this embodiment, the first pipeline 101 is provided with a first water inlet and a second water inlet. The first water inlet is connected to the second water inlet pipeline 108, and the second water inlet is connected to one end of the third water inlet pipeline 120. The other end of the third water inlet pipeline 120 is connected to the first water inlet pipeline 107. The first water inlet pipeline 107 and the end of the second water inlet pipeline 108 away from the first pipeline 101 are connected. It also includes a circulating heating device 109. Water from the first inlet pipe 107 enters the circulating heating device 109 for heating, and then enters the main fire-fighting pipeline through the third inlet pipe 120. When the temperature drops, the circulating heating device 109 can be activated. The pump in the circulating heating device 109 circulates the water in the main fire-fighting pipeline, allowing water from the first inlet pipe 107 to enter the circulating heating device 109. After being heated, the water then enters the main fire-fighting pipeline through the third inlet pipe 120. The water in the main fire-fighting pipeline then flows into the second inlet pipe 108. Since the second inlet pipe 108 is connected to the first inlet pipe 107, the water in the main fire-fighting pipeline circulates, achieving the purpose of heating the water in the main fire-fighting pipeline. This process repeats, ensuring that the water in the main fire-fighting pipeline does not freeze. The circulating heating device 109 directly heats the water flowing through the main fire-fighting pipeline, effectively reducing energy consumption. This not only improves energy efficiency but also lowers operating costs and enhances economic viability.

[0043] Specifically, when the main fire-fighting pipeline is in a cold region or during a cold period, the circulating heating device 109 is activated to circulate the water in the main fire-fighting pipeline. Water from the first inlet pipe 107 enters the circulating heating device 109, and after being heated, the water flows back into the main fire-fighting pipeline through the third circulation pipe 120. The water then flows into the second inlet pipe 108. Since the second inlet pipe 108 is connected to the first inlet pipe 107, the water in the main fire-fighting pipeline circulates, achieving the purpose of heating the water in the main fire-fighting pipeline. This prevents the fire-fighting water in the main fire-fighting pipeline from freezing, ensuring the service life and timely application of the main fire-fighting pipeline. It also prevents the fire hydrants 203 in the tunnel from failing to discharge water normally during a fire, thus ensuring the safety of the tunnel. The fire water tank 110 will only operate when there is a fire-fighting situation in the tunnel or when there is a leak in the main fire-fighting pipeline, replenishing the main fire-fighting pipeline to ensure sufficient water supply and that the fire hydrants 203 can effectively extinguish fires in the event of a fire. In other words, if there is no leak in the main fire pipeline or the fire hydrant 203 is not working, the water in the fire water tank 110 will not enter the second water inlet pipe 108 and the main fire pipeline.

[0044] Understandably, according to Article 10.2.3.2 of Volume II of the "Specifications for Design of Highway Tunnels" (JTG D70 / 2-2014), the spacing between fire hydrants (203) in a single-bore highway tunnel should not exceed 50m. Although this tunnel is a twin-bore tunnel, the traffic direction of each bore is one-way. Therefore, the spacing of fire hydrants (203) should be arranged according to the single-bore standard. Thus, the spacing of fire hydrants (203) in each tunnel should be one every 48m to 50m, with a typical setup of 20 fire hydrants (203). The tunnel length is usually around 1000m.

[0045] It should be noted that when the tunnel is a single-bore tunnel with two lanes on each side, the main fire-fighting pipeline includes a first pipeline 101, a third pipeline 103, a second pipeline 102, and a fourth pipeline 104 connected in sequence. In this case, the fire hydrants 203 connected to the first pipeline 101 and the second pipeline 102 are both located inside the tunnel. Adjacent fire hydrants 203 on the first pipeline 101 can be spaced 96m to 100m apart, and similarly, adjacent fire hydrants 203 on the second pipeline 102 can be spaced 96m to 100m apart. The fire hydrants 203 on the first pipeline 101 and the fire hydrants 203 on the second pipeline 102 are spaced apart to ensure that the installation of the fire hydrants 203 complies with the requirements of the "Highway Tunnel Design Code". Furthermore, when the tunnel is a single-bore tunnel with two lanes on each side, the installation of other components is the same as that of a double-bore tunnel and will not be described again.

[0046] In other words, regardless of the type of tunnel in which the circulating heating system 100 of the main fire-fighting pipeline is installed, the main fire-fighting pipeline is always a loop pipe. After being connected to the circulating heating device 109, the pump of the circulating heating device 109 drives the water in the loop-shaped main fire-fighting pipeline to circulate and provide heat, ensuring that the water in the main fire-fighting pipeline does not freeze during cold seasons and in cold regions. It is understandable that the diameter of the main fire-fighting pipeline is larger than the diameter of the branch pipes connecting to the fire hydrants 203.

[0047] It is understood that the first and second water inlets in the accompanying drawings of this embodiment are only an example of the first water inlet and the second water inlet being set on the first pipe 101. In practice, the first and second water inlets can be set at any position on the main fire-fighting pipe, as long as they are connected to the circulating heating device 109 in a loop.

[0048] In one feasible implementation, when the tunnel is a twin-tube tunnel, the first pipe 101 is located at the bottom corner of the right wall in the direction of vehicle travel within the first tunnel 201, and the second pipe 102 is located at the bottom corner of the right wall in the direction of vehicle travel within the second tunnel 202.

[0049] Understandably, according to Article 10.2.3.1 of Volume 2 of the Highway Tunnel Design Code, Traffic Engineering and Ancillary Facilities JTG D70 / 2-2014, fire hydrants 203 should be fixedly installed in the fire-fighting chamber on the right side wall of the tunnel along the direction of traffic. Therefore, it is not necessary to install them on both sides, thereby reducing installation and maintenance costs while ensuring safety.

[0050] It should be noted that, typically when the tunnel is a single-tube tunnel, the main fire-fighting pipeline is also located at the bottom corners of both sides of the tunnel wall.

[0051] In one feasible implementation, multiple first temperature sensors are installed inside the tunnel, a third temperature sensor is installed outside the tunnel, multiple second temperature sensors are installed inside the main fire-fighting pipeline, and a second temperature sensor is installed at the first water inlet and the second water inlet, respectively. The temperature change along the outer edge of the main fire-fighting pipeline is predicted based on the monitoring values ​​of the first and third temperature sensors, and the opening, heating temperature and flow rate of the circulating heating device 109 are controlled according to the temperature change. The heating temperature and flow rate of the circulating heating device 109 are corrected according to the monitoring values ​​of the second temperature sensors.

[0052] The number of first temperature sensors and second temperature sensors are the same and they are set accordingly. That is, if a second temperature sensor is set inside the fire main pipe, a first temperature sensor is set outside the fire main pipe accordingly. This makes it easier to use multiple first temperature sensors as boundary conditions for prediction.

[0053] Specifically, a predictive model is obtained by learning from historical temperature monitoring data (temperature inside and outside the tunnel) of existing tunnels. That is, based on changes in the temperature outside the tunnel and temperature changes (temperature distribution) along the tunnel's perimeter (along the main fire hydrant), the temperature changes within the main fire hydrant are predicted, identifying the most unfavorable point. The predicted value at this point is used as the condition for opening and closing the circulating heating device 109. If this predicted value differs from the set temperature value, the circulating heating device 109 is controlled to change its flow rate and / or heating temperature. The temperature changes along the perimeter can be achieved by installing first temperature sensors at key points along the main fire hydrant's perimeter (such as the tunnel entrance, multiple points inside the tunnel, the first inlet, and the second inlet), and second temperature sensors at corresponding locations inside the main fire hydrant. By combining the monitoring values ​​from the first temperature sensor (temperature inside the tunnel) and the third temperature sensor (temperature outside the tunnel), the temperature changes within the main fire hydrant during the next hot water supply cycle are predicted, thereby controlling the flow rate and heating temperature of the circulating heating device 109. In other words, by using machine learning on historical temperature data and combining it with the actual measured temperatures from the first and third temperature sensors, it is possible to predict the temperature changes and distribution along the main fire-fighting pipeline during the next cycle period, identify the most unfavorable point, and use this to control the opening and closing of the circulating heating device 109. Furthermore, software calculations are used to determine the appropriate heating temperature and flow rate that the circulating heating device 109 should provide under this temperature distribution. The software calculations constitute programmable control and are not the subject of this application; therefore, they will not be elaborated upon. This application aims to protect a concept for controlling the circulating heating device 109.

[0054] It should be noted that the monitoring value of the second temperature sensor provides feedback on the predictive control effect of the first and third temperature sensors. The monitoring value of the second temperature sensor is used to correct the timing of the operation of the circulating heating device 109 and optimize its heating temperature and flow rate. For example, if the circulating heating device 109 operates at a certain flow rate and heating temperature based on prediction, and under these operating conditions, if the actual temperature at the most unfavorable point monitored by the second temperature sensor is still lower than the set temperature value, then the heating temperature or flow rate of the circulating heating device 109 is increased. Conversely, if the actual temperature at the most unfavorable point monitored by the second temperature sensor is higher than the set temperature value, then the heating temperature and flow rate of the circulating heating device 109 are decreased. This improves the energy-saving effect of the circulating heating device 109, enhances its economic efficiency, and simultaneously achieves intelligent control, reducing manual intervention and increasing efficiency.

[0055] Understandably, the most unfavorable location might be at the tunnel entrance or at the first water inlet (the final outlet of the water circulation). Since parts of the pipeline containing the first and second water inlets may be buried underground, under certain special circumstances, the temperature monitored by the first temperature sensor at the first water inlet might be higher than that monitored by the first sensor at the tunnel entrance. Historical temperature monitoring data can be studied using data from six months to one year.

[0056] Furthermore, based on the predicted conditions, the circulating heating device 109 can be activated in advance to ensure that the water in the main fire-fighting pipeline does not freeze. Simultaneously, if the temperature at the most unfavorable point in the main fire-fighting pipeline remains above 5°C, the heater of the circulating heating device 109 can be shut off, but the circulating pump of the circulating heating device 109 will remain running. When the temperature at the point outside the tunnel entrance of the main fire-fighting pipeline drops below -5°C to 0°C, the heater of the circulating heating device 109 will be restarted. When the temperature at the point outside the tunnel entrance is above 0°C to 2°C, the circulating heating device 109 will be shut off and no longer used, transitioning from the circulating heating and pressure stabilization mode to the normal pressure stabilization mode of the circulating heating system 100 in the main fire-fighting pipeline inside the tunnel.

[0057] Understandably, due to potential discrepancies between learning and practice, setting the temperature range to -5℃ to 0℃—meaning the temperature at the tunnel entrance outside the main fire pipeline is below -5℃ to 0℃—allows the circulating heating device 109 to be activated. This prevents the main fire pipeline from freezing due to potential errors. In other words, by allowing a margin in the set temperature value, the activation of the circulating heating device 109 is ensured ahead of time, preventing the main fire pipeline from freezing and affecting the activation of the circulating heating system 100 within the tunnel. Furthermore, if the ambient temperature remains consistently below a certain level, the circulating heating device 109 can remain operational at the lowest possible flow rate.

[0058] For example, an electric heating cable can be installed on the outer wall of the branch pipe for insulation, reducing the area of ​​the electric heating cable used and thus reducing operating costs. At the same time, because of the circulating heating device 109, the power of the electric heating cable can be appropriately reduced, which can also achieve the purpose of energy saving.

[0059] For example, typically the second temperature sensor at the second inlet monitors the highest temperature, while the second temperature sensor at the first inlet or the temperature at the opening is the lowest. As the number of water circulation cycles increases, the temperature difference between the second temperature sensors gradually decreases, and the temperature gradually increases. This causes the temperature of the first temperature sensor to change as well. By using the measured values ​​from the third and first temperature sensors, the temperature change outside the main fire-fighting pipeline in the next cycle is predicted. This process is repeated to control the flow rate and heating speed of the circulating heating device.

[0060] It is understandable that machine learning involves collecting and processing data, then incorporating conditions such as wind speed and direction to build a predictive model for the relevant data. This model's accuracy is then validated through multiple real-world measurements before being used to improve prediction accuracy. This learning method is existing technology, and since the learning process is not the focus of this application, it will not be elaborated upon. What is being protected here is the logic of learning through a set temperature sensor.

[0061] In one feasible implementation, a fifth solenoid valve 115 is provided on the first pipe 101, and the fifth solenoid valve 115 is located between the third water inlet pipe 120 and the second water inlet pipe 108. A fourth solenoid valve 114 is provided between the first water inlet pipe 107 and the third water inlet pipe 120.

[0062] The circulating heating device 109, the fourth solenoid valve 114, and the fifth solenoid valve 115 enable the switching of more than 100 operating conditions for the circulating heating system of the main fire-fighting pipeline in the tunnel. These three operating conditions include conventional pressure stabilization, circulating heating pressure stabilization, and fire-fighting.

[0063] It should be noted that when the circulating heating system 100 of the main fire-fighting pipeline in the tunnel is under normal pressure stabilization conditions, the circulating heating device 109 is not turned on, and the fourth solenoid valve 114 and the fifth solenoid valve 115 are turned on. This ensures that after the main fire-fighting pipeline is completely filled with water and the pressure is stable, the water in the main fire-fighting pipeline hardly flows. Figure 2As shown. When the circulating heating system 100 of the main fire-fighting pipeline in the tunnel is in circulating heating and pressure stabilization mode, the circulating heating device 109 is turned on, and the fourth electric valve 114 and the fifth electric valve 115 are closed. The water in the main fire-fighting pipeline begins to flow. After entering the first inlet pipe 107 through the second inlet pipe 108, it enters the circulating heating device 109. After being heated by the circulating heating device 109, the water enters the third inlet pipe 120 and then sequentially enters part of the first pipe 101, the third pipe 103, the second pipe 102, the fourth pipe 104, and another part of the first pipe 101 before entering the second inlet pipe 108. This cycle is repeated to heat the water in the main fire-fighting pipeline and prevent the water from freezing in the main fire-fighting pipeline. When the circulating heating system 100 of the main fire-fighting pipeline in the tunnel is in fire-fighting mode, the fourth solenoid valve 114 and the fifth solenoid valve 115 open within 30 seconds of a fire breaking out, while the third solenoid valve 113 and the circulating heating device 109 close within 30 seconds. After the fire ends, the fourth solenoid valve 114 and the fifth solenoid valve 115 close, and the temperature monitored by the third temperature sensor determines whether to activate the circulating heating device 109. The specific activation and deactivation of the circulating heating device 109 is as described above and will not be repeated here. In other words, if the third temperature sensor reaches the first low temperature, the circulating heating device 109 can be activated based on the learning time, entering the circulating heating and pressure stabilization mode. If the third temperature sensor does not reach the first low temperature, or the second temperature sensor is not lower than the second low temperature, the circulating heating device 109 is not activated, and the circulating heating system 100 of the main fire-fighting pipeline in the tunnel is in normal pressure stabilization mode.

[0064] Understandably, in the event of a fire, the circulating heating system 100 of the main fire-fighting pipeline in the tunnel needs to be restored to fire-fighting operation immediately. According to Article 7.1.6.1 of the "Technical Specification for Fire Water Supply and Fire Hydrant Systems" (GB 50974-2014), the opening time of solenoid valves should not exceed 30 seconds. Immediately closing the fourth solenoid valve 114 and the fifth solenoid valve 115 after the fire is extinguished is to quickly restore the system to its normal pressure-stabilizing condition and to determine whether the circulating heating device 109 should be opened based on the actual temperature.

[0065] Understandably, when in a non-low temperature environment, the circulating heating device 109 is not turned on, that is, the first solenoid valve 111, the second solenoid valve 112 and the third solenoid valve 113 are closed, while the fourth solenoid valve 114 and the fifth solenoid valve 115 are turned on, so that the fire main pipeline returns to normal pressure stabilization conditions.

[0066] It should be noted that when the tunnel is a single-bore tunnel, the installation of the main fire-fighting pipeline, the circulating heating device 109, and the water inlet pipeline is the same as that of the double-bore tunnel. The valve installation is also the same as that of the double-bore tunnel. The principle is the same and will not be repeated below.

[0067] In one feasible implementation, the first water inlet pipe 107 is connected to the fifth pipe 105 and then enters the circulating heating device 109. The water after passing through the circulating heating device 109 is connected to the third water inlet pipe 120 through the sixth pipe. The fourth solenoid valve is located between the fifth pipe and the sixth pipe.

[0068] The fourth solenoid valve 114 is located between the first water inlet pipe 107 and the third water inlet pipe 120, and between the fifth pipe 105 and the sixth pipe 106. When the circulating heating device 109 needs to be started, in order to allow the water in the fire main pipe to pass through the circulating heating device 109 before entering the fire main pipe, that is, to allow the water to circulate in the fire main pipe, the second water inlet pipe 108, the first water inlet pipe 107, the circulating heating device 109, the third water inlet pipe 120 and the fire main pipe, the fourth solenoid valve 114 and the fifth solenoid valve 115 need to be closed.

[0069] In one feasible implementation, the sixth pipe 106 is provided with a third solenoid valve 113, and the fifth pipe 105 is provided with a first solenoid valve 111.

[0070] A first solenoid valve 111 is installed before the inlet of the circulating heating device 109, and a third solenoid valve 113 is installed after the outlet of the circulating heating device 109. The first solenoid valve 111 controls the opening and closing of the circulating heating device 109, and the third solenoid valve 113 blocks the continued flow of water.

[0071] It should be noted that, based on the practical requirement of one in use and one on standby, this embodiment sets up two sets of circulating heating devices 109, namely a first circulating heating device and a second circulating heating device. A first solenoid valve 111 is installed before the inlet of the first circulating heating device, and a second solenoid valve 112 is installed before the inlet of the second circulating heating device (standby). The outlets of both circulating heating devices 109 are connected to a sixth pipe 106, therefore a third solenoid valve 113 is installed on the sixth pipe 106. It can be understood that only one of the first solenoid valve 111 and one of the second solenoid valve 112 is installed. Since the circulating heating devices 109 have adopted a one-in-one-on-standby configuration, installing only one solenoid valve can meet the needs of replacement and maintenance, while improving the economy of the circulating heating system 100 of the main fire-fighting pipeline in the tunnel. The main function of the third solenoid valve 113, the fourth solenoid valve 114, and the fifth solenoid valve 115 is to control the water flow direction in the main fire-fighting pipeline, therefore only one is required.

[0072] Among them, the first solenoid valve 111 to the fifth solenoid valve 115 are all controlled to open and close by the controller. The solenoid valves that are opened and closed are selected according to the required working conditions, which can realize the simultaneous opening and closing of multiple solenoid valves, improve the efficiency of opening and closing of solenoid valves, and improve the intelligence level of the circulating heating system 100 of the fire protection main pipeline in the tunnel.

[0073] In one feasible implementation, the second water inlet pipe 108 is connected to the fire water tank 110 through the first connecting pipe 117 and the third connecting pipe 119. A fire pump 121 is installed on the first connecting pipe 117, and a pressure stabilizing pump 122 is installed on the third connecting pipe 119. The power of the fire pump 121 is greater than the power of the pressure stabilizing pump 122.

[0074] Based on the principle of one in use and one on standby, two first connecting pipes 117 can be set up, and one fire pump 121 can be set up on each first connecting pipe 117, so that two fire pumps 121 can be set up; similarly, two third connecting pipes 119 can be set up, and one pressure stabilizing pump 122 can be set up on each third connecting pipe 119, so that two pressure stabilizing pumps 122 can be set up, which can ensure the reliability and stability of the circulating heating system 100 of the main fire pipeline in the tunnel.

[0075] It should be noted that the power of fire pump 121 is greater than that of pressure-stabilizing pump 122. When the circulating heating system 100 of the main fire pipeline in the tunnel is in fire-fighting mode, fire pump 121 starts, drawing sufficient water from fire water tank 110 into fire hydrant 203 for fire extinguishing. After the fire is extinguished and the main fire pipeline is full of water, fire pump 121 shuts off. At this time, pressure is stabilized by pressure-stabilizing pump 122 to ensure the stability of pressure in the main fire pipeline, thereby ensuring the safety and service life of the main fire pipeline.

[0076] In one feasible implementation, a pressure switch 123 and a first rising stem gate valve 124 are provided on the first connecting pipe 117, and a second rising stem gate valve 126 is provided on the third connecting pipe 119.

[0077] The pressure switch 123 is located near the second inlet pipe 108. A first rising stem gate valve 124 is installed on both sides of the fire pump 121, and a second rising stem gate valve 126 is installed at both ends of the pressure-stabilizing pump 122. It is understood that the first rising stem gate valves 124 and the second rising stem gate valves 126 are normally open valves, only closing when the fire pump 121 and / or the pressure-stabilizing pump 122 require maintenance. The rising stem gate valves are installed according to the requirements of the 19S204-1 standard drawing set "Selection and Installation of Fire-Fighting Water Pumps," which will not be elaborated further.

[0078] It should be noted that a pressure switch 123 is installed on the first connecting pipe 117 where the fire pump 121 is located. This is used to control the start of the fire pump 121 according to the system pressure. This can improve the accuracy of the fire pump 121 starting, reduce energy consumption while ensuring the timeliness of fire extinguishing, and improve the economy of the circulating heating system 100 of the main fire pipeline in the tunnel.

[0079] It is understandable that the first rising stem gate valve 124 at both ends of the fire pump 121 and the second rising stem gate valve 126 at both ends of the pressure stabilizing pump are normally open valves, which can be manually closed when maintenance is required.

[0080] For example, four butterfly valves 125 are installed on the second water inlet pipe 108. These four butterfly valves 125 are respectively located between the first connecting pipe 117 and the first pipe 101, between two first connecting pipes 117, between the first connecting pipe 117 and the third connecting pipe 119, and between two third connecting pipes 119. This arrangement of butterfly valves 125 facilitates maintenance or isolates the system in case of a malfunction in the circulating heating system 100 of the main fire-fighting pipeline within the tunnel, allowing for separate maintenance of each component. It is understood that the four butterfly valves 125 are normally open and can be manually closed during maintenance or in case of a malfunction.

[0081] In one feasible implementation, the circulating heating system 100 of the main fire-fighting pipeline in the tunnel also includes a pressure stabilizing tank 116, which is located at one end of the first water inlet pipe 107 near the fire-fighting water tank 110.

[0082] The pressure stabilizing tank 116 maintains the stability of the pressure in the circulating heating system 100 of the main fire-fighting pipeline within the tunnel. When the system pressure drops to a certain level, the pressure stabilizing tank 116 automatically starts the booster pump to increase the system pressure until it reaches the set pressure. The pressure stabilizing tank 116 also reduces the frequent starting and stopping of the pressure stabilizing pump 122, thus supplementing the pump and extending its service life while reducing energy consumption. Furthermore, the pressure stabilizing tank 116 regulates the system's working pressure to ensure that fire hydrants 203 can quickly obtain sufficient water pressure and volume during a fire, thereby guaranteeing the stability and reliability of the fire extinguishing effect. In the circulating heating system 100 of the main fire-fighting pipeline within the tunnel, sudden changes in water flow direction can easily cause water hammer, leading to damage to the main fire-fighting pipeline. The pressure stabilizing tank can absorb pressure fluctuations, reducing the impact of water hammer on the system and preserving the safety and service life of the main fire-fighting pipeline.

[0083] Specifically, four pressure control points, p1, p2, ps1, and ps2, are set within the pressure stabilizing tank 116. Each pressure control point is connected to a control relay. p1 is the minimum design operating pressure of the pressure stabilizing tank 116, p2 is the starting pressure of the fire pump 121, ps1 is the starting pressure of the pressure stabilizing pump 122, and ps2 is the stopping pressure of the pressure stabilizing pump 122. When the pressure in the pressure stabilizing tank 116 is ps2, the circulating heating system 100 of the main fire-fighting pipeline in the tunnel is under higher pressure, and both the pressure stabilizing pump 122 and the fire pump 121 are in a non-working state (not started). As the circulating heating system 100 of the main fire-fighting pipeline in the tunnel leaks due to seepage or other reasons, the pressure in the pressure stabilizing tank 116 drops from ps2 to ps1. At this point, the pressure stabilizing pump 122 starts to replenish water to the pressure stabilizing tank 116 until the pressure in the pressure stabilizing tank 116 reaches ps2, at which point the pressure stabilizing pump 122 stops working, thus ensuring the continuous storage of fire-fighting water in the pressure stabilizing tank 116. When a fire occurs in the tunnel, the water supply in the circulating heating system 100 of the main fire pipeline in the tunnel decreases as the fire hydrant 203 is activated, causing the system pressure to drop continuously from ps2 to p2. At the same time, an alarm is triggered and a signal is sent to the fire control center, automatically starting the fire pump 121 (pressure switch 123 is activated) to supply water to the main fire pipeline. After the fire pump 121 starts, the pressure stabilizing pump 122 automatically stops operating.

[0084] In one feasible implementation, when the tunnel length is greater than a first distance, multiple circulation sections are set up in the tunnel, each circulation section including a fire-fighting main pipeline and a circulating heating device 109, and the first distance is 5km to 6km.

[0085] In other words, when the tunnel is a long tunnel, meaning the tunnel length exceeds the first distance, multiple circulation sections can be set up to ensure the normal operation of the circulating heating system 100 of the main fire-fighting pipeline within the tunnel. The main fire-fighting pipeline can be divided into multiple circulation sections, each equipped with a circulating heating device 109 to maintain the liquid state of the water in the main fire-fighting pipeline, preventing the water from freezing. Freezing of the water in the main fire-fighting pipeline would affect its service life and prevent it from quickly extinguishing a fire, leading to serious consequences. Therefore, circulation sections are typically set up at intervals of 5km to 6km. Each circulation section includes the main fire-fighting pipeline and a circulating heating device 109, with the valve settings as described above. Multiple circulating heating devices 109 heat the water in their respective connected main fire-fighting pipelines, thereby increasing the heating circulation speed of the main fire-fighting pipeline within a long tunnel.

[0086] It is understandable that the above diagram is drawn based on a double-bore tunnel, and the principle and the setting of each component are the same for single-bore lanes and long tunnels.

[0087] Figure 2This is a schematic diagram of a conventional voltage regulation condition according to an embodiment of the present invention; Figure 3 This is a schematic diagram of a circulating heating and pressure stabilization operation according to an embodiment of the present invention; Figure 4 This is a schematic diagram of a fire protection operation according to an embodiment of the present invention.

[0088] like Figures 2 to 4 As shown, another embodiment of this utility model provides a method for using a circulating heating system for a main fire-fighting pipeline in a tunnel. Based on the aforementioned circulating heating system 100 for a main fire-fighting pipeline in a tunnel, the method of use is divided into three operating conditions: conventional pressure stabilization condition, circulating heating pressure stabilization condition, and fire-fighting condition. The method of use includes:

[0089] When the circulating heating system 100 of the main fire-fighting pipeline in the tunnel is in normal pressure stabilization mode: the circulating heating device 109 does not participate in the operation;

[0090] When the circulating heating system 100 of the main fire-fighting pipeline in the tunnel is in circulating heating and pressure stabilization mode, the circulating heating device 109 participates in the operation.

[0091] When the circulating heating system 100 of the fire-fighting main pipeline in the tunnel is in fire-fighting mode, the circulating heating device 109 does not participate in the work when a fire occurs. After the fire is over, the circulation heating device 109 will be determined to participate in the work based on the temperature inside the tunnel and the temperature inside the fire-fighting main pipeline.

[0092] Specifically, the aforementioned circulating heating system 100 for the main fire-fighting pipeline within the tunnel can be applied to three different working conditions. For example... Figure 2 As shown, the first operating condition is the conventional pressure stabilization condition under non-low temperature conditions: In this case, the fourth solenoid valve 114 and the fifth solenoid valve 115 need to be in the normally open state, and the first solenoid valve 111, the second solenoid valve 112, and the third solenoid valve 113 need to be in the closed state. The main fire pipeline is completely filled with water, and the pressure in the pressure stabilizing tank 116 is at ps2, that is, the circulating heating system 100 of the main fire pipeline in the tunnel is in a high pressure state. At this time, neither the pressure stabilizing pump 122 nor the fire pump 121 is turned on, the water in the main fire pipeline is basically in a static state, and the temperature is higher than 5℃. The circulating heating device 109 does not participate in the operation.

[0093] like Figure 3As shown, the second operating condition is when the temperature inside the tunnel and / or inside the main fire-fighting pipeline is low, i.e., during the cold season or in a cold region, the circulating heating system 100 of the main fire-fighting pipeline inside the tunnel enters the circulating heating and pressure stabilization mode. At this time, the fourth solenoid valve 114 and the fifth solenoid valve 115 are closed, and the first solenoid valve 111 (or the second solenoid valve 112) and the third solenoid valve 113 are opened. The power unit of the circulating heating device 109 causes the water in the main fire-fighting pipeline to flow, and it passes sequentially through the first inlet pipe 107, the fifth pipe 105, the circulating heating device 109, the sixth pipe 106, the third inlet pipe 120, the second inlet, part of the first pipe 101, the third pipe 103, the second pipe 102, the fourth pipe 104, and another part of the first pipe 101, and then enters the second inlet pipe 108 through the first inlet and then enters the first inlet pipe 107, continuously circulating to make the water in the main fire-fighting pipeline circulate. Figure 3 (The direction of the middle arrow indicates the water flow direction). At this time, since the pressure in the main fire-fighting pipeline and the circulating heating device 109 is stable, neither the pressure-stabilizing pump 122 nor the fire pump 121 needs to operate. It can be understood that the circulating heating device 109 can be a heat exchanger, enabling the water in the fifth pipeline 105 to be heated before entering the sixth pipeline 106 and then the main fire-fighting pipeline. This avoids freezing of the water in the main fire-fighting pipeline due to low temperatures, improving the safety and reliability of the circulating heating system 100 of the main fire-fighting pipeline in the tunnel under cold conditions.

[0094] Understandably, when the flow rate of the circulating heating device 109 is gradually reduced, if the temperature of the second temperature sensor is not lower than the first low temperature, the first solenoid valve 111 (or the second solenoid valve 112) and the third solenoid valve 113 can be closed again, while the fourth solenoid valve 114 and the fifth solenoid valve 115 are opened, returning to the normal pressure stabilization condition.

[0095] like Figure 4As shown, the third operating condition is when a fire occurs inside the tunnel, the circulating heating system 100 of the main fire-fighting pipeline in the tunnel enters the fire-fighting mode. At this time, the fourth solenoid valve 114 and the fifth solenoid valve 115 must open within 30 seconds of the fire starting, while the first solenoid valve 111 (or the second solenoid valve 112) and the third solenoid valve 113 must close within 30 seconds of the fire starting. After the fire ends, the fourth solenoid valve 114 and the fifth solenoid valve 115 close. Simultaneously, based on whether the third temperature sensor reaches the first low temperature and the time it takes for the water in the main fire-fighting pipeline to complete one cycle, it is determined whether to activate the circulating heating device 109, causing the circulating heating system 100 of the main fire-fighting pipeline in the tunnel to enter the circulating heating and pressure-stabilizing mode. If it is not necessary to activate the circulating heating device 109, the fourth solenoid valve 114 and the fifth solenoid valve 115 open, and the circulating heating system 100 of the main fire-fighting pipeline in the tunnel returns to the normal pressure-stabilizing mode. Because the water in the main fire pipeline is used for the outlet of fire hydrant 203, the water volume in pressure tank 116 decreases, and the pressure continuously drops, causing the pressure in the main fire pipeline to rapidly drop to p2. Simultaneously with the alarm, a signal is sent to the fire control center, pressure switch 123 opens, and fire pump 121 starts. After fire pump 121 starts, pressure pump 122 stops working. At this time, water in fire water tank 110 is rapidly transported into the main fire pipeline to complete the fire extinguishing work. After the fire is extinguished, fire hydrant 203 is closed. In cold conditions, after fire hydrant 203 is closed, the fourth solenoid valve 114 and the fifth solenoid valve 115 are immediately closed, while the first solenoid valve 111 (or the second solenoid valve 112) and the third solenoid valve 113 are opened, allowing the circulating heating device 109 to participate in heating the water in the main fire pipeline. In non-cold conditions, after fire hydrant 203 is closed, the circulating heating system 100 of the main fire pipeline in the tunnel returns to normal pressure stabilization conditions.

[0096] It is understandable that when pressure switch 123 automatically starts fire pump 121, it is related to the pressure of the circulating heating system 100 of the main fire pipeline in the tunnel. However, when fire pump 121 is shut down, it is done manually based on the actual situation on site (that is, the fire is completely extinguished), and it is unrelated to the pressure.

[0097] It should be noted that "cold conditions" refers to the situation where the monitoring value of the third temperature sensor can reach the first low temperature, while "non-cold conditions" refers to the situation where the monitoring value of the third temperature sensor is always higher than the first low temperature. Figure 4 The direction of the middle arrow indicates the direction of water flow during firefighting operations.

[0098] For example, Figure 4The illustration only depicts the water flow direction under one fire-fighting condition. In fire-fighting operations, when only one fire hydrant 203 or some fire hydrants 203 are used, the fifth solenoid valve 115 is open, causing the main fire-fighting pipeline to form a loop. At this time, the pressure change within the main fire-fighting pipeline due to water flow causes water in the first inlet pipe 107, the second inlet pipe 108, and the third inlet pipe 120 to flow towards the open fire hydrant 203, thus changing the water flow direction. Therefore, the fourth solenoid valve 114 and the fifth solenoid valve 115 open, without restricting the water flow direction, allowing fire-fighting water to flow more promptly from the open fire hydrant 203, improving the timeliness and reliability of fire suppression. Because of the changed water flow direction, the pressure stabilizing tank 116 can prevent water hammer, protecting the safety of the main fire-fighting pipeline. It should be noted that in circulating heating operations, the water flow needs to be forced to be completely... Figure 3 The flow direction is reversed, at which point the fifth solenoid valve 115 needs to be closed.

[0099] Understandably, in addition to changes in water flow during firefighting operations, when a leak occurs in the main firefighting pipeline, the water flow will also change direction due to the pressure change within the pipeline, flowing towards the leak. At this time, the pressure stabilizing tank 116 can also ensure pressure balance, prevent water hammer, and ensure the safety and reliability of the main firefighting pipeline.

[0100] In this invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The term "multiple" refers to two or more unless otherwise expressly defined.

[0101] Other embodiments of the present invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. The present invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only.

[0102] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A circulating heating system for a main fire-fighting pipeline in a tunnel, characterized in that, The circulating heating system of the main fire-fighting pipeline in the tunnel includes: The fire-fighting main pipeline is connected to fire hydrants via branch pipelines, and the fire-fighting main pipeline is equipped with a first water inlet and a second water inlet; The circulating heating device is connected to the first water inlet and the second water inlet respectively through water inlet pipes; A fire-fighting water tank is connected to the water inlet pipe.

2. The circulating heating system for the main fire-fighting pipeline in the tunnel according to claim 1, characterized in that, The water inlet pipeline includes a first water inlet pipeline, a second water inlet pipeline, and a third water inlet pipeline. The main fire-fighting pipeline includes a first pipeline, a third pipeline, a second pipeline, and a fourth pipeline connected in sequence. The first pipeline and the second pipeline are connected to the fire hydrant through the branch pipeline. The first water inlet is connected to the second water inlet pipeline, and the second water inlet is connected to the third water inlet pipeline. The third water inlet pipeline and the second water inlet pipeline are connected through the first water inlet pipeline. After the water from the first water inlet pipeline enters the circulating heating device for heating, it enters the main fire-fighting pipeline through the third water inlet pipeline. The fire-fighting water tank is connected to the second water inlet pipeline. When the tunnel is a twin-tube tunnel, the twin-tube tunnel includes a first tunnel and a second tunnel, the first pipe is located at the bottom corner of the side wall of the first tunnel, and the second pipe is located at the bottom corner of the side wall of the second tunnel; when the tunnel is a single-tube tunnel, the first pipe and the second pipe are located at the bottom corners of the side walls of the tunnel respectively.

3. The circulating heating system for the main fire-fighting pipeline in the tunnel according to claim 2, characterized in that, Multiple first temperature sensors are installed inside the tunnel, a third temperature sensor is installed outside the tunnel, and multiple second temperature sensors are installed inside the main fire-fighting pipeline. One second temperature sensor is installed at the first water inlet and the second water inlet, respectively. The temperature change along the outer edge of the main fire-fighting pipeline is predicted based on the monitoring values ​​of the first and third temperature sensors, and the opening, heating temperature, and flow rate of the circulating heating device are controlled according to the temperature change. The heating temperature and flow rate of the circulating heating device are corrected according to the monitoring values ​​of the second temperature sensors.

4. The circulating heating system for the main fire-fighting pipeline in the tunnel according to claim 2, characterized in that, A fifth solenoid valve is provided on the first pipe, and the fifth solenoid valve is located between the third water inlet pipe and the second water inlet pipe. A fourth solenoid valve is provided between the first water inlet pipe and the third water inlet pipe.

5. The circulating heating system for the main fire-fighting pipeline in the tunnel according to claim 4, characterized in that, After the first inlet pipe is connected to the fifth pipe, the water enters the circulating heating device. After passing through the circulating heating device, the water is connected to the third inlet pipe through the sixth pipe. The fourth solenoid valve is located between the fifth pipe and the sixth pipe.

6. The circulating heating system for the main fire-fighting pipeline in the tunnel according to claim 5, characterized in that, The sixth pipe is equipped with a third solenoid valve, and the fifth pipe is equipped with a first solenoid valve.

7. The circulating heating system for the main fire-fighting pipeline in the tunnel according to claim 2, characterized in that, The second water inlet pipe is connected to the fire water tank through a first connecting pipe and a third connecting pipe. A fire pump is installed on the first connecting pipe, and a pressure stabilizing pump is installed on the third connecting pipe. The power of the fire pump is greater than that of the pressure stabilizing pump.

8. The circulating heating system for the main fire-fighting pipeline in the tunnel according to claim 2, characterized in that, The circulating heating system of the main fire-fighting pipeline in the tunnel also includes a pressure stabilizing tank, which is located at one end of the first water inlet pipeline near the fire-fighting water tank.

9. The circulating heating system for the main fire-fighting pipeline in a tunnel according to any one of claims 1 to 8, characterized in that, When the tunnel length is greater than the first distance, multiple circulation sections are set in the tunnel, each circulation section including a fire-fighting main pipeline and a circulation heating device, and the first distance is 5km to 6km.

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