Fire extinguishing system based on temperature sensing grating

Abstract

The utility model discloses a fire-fighting system based on temperature-sensing gratings, which comprises a plurality of temperature-sensing gratings, and a temperature-sensing grating operation station, a fire-fighting linkage system and a fire-fighting spraying system which are connected in sequence, and the plurality of temperature-sensing gratings are connected with the temperature-sensing grating operation station; the plurality of temperature sensing gratings are used for being installed on each liquefied hydrocarbon spherical tank in a spherical tank area, the temperature sensing grating operation station receives a detection signal of each temperature sensing grating and measures the surface temperature of the spherical tank in real time, when the temperature exceeds a preset value, an abnormal signal is output to the fire-fighting linkage system, and the fire-fighting linkage system outputs a starting signal to the fire-fighting spraying system; the fire-fighting spraying system is used for spraying and extinguishing fire on the spherical tank; the temperature sensing grating captures abnormal temperature information in real time, is linked with a fire fighting system to timely start fire fighting spraying protection spherical tank equipment, and meanwhile, can warn personnel at the position of the spherical tank to carry out corresponding emergency treatment at the first time, so that property loss caused by sudden accidents can be reduced, and maximum benefits of companies are ensured.

Description

Technical Field

[0001] This utility model belongs to the field of fire protection technology for spherical tanks, specifically a fire protection system based on a temperature-sensing grating. Background Technology

[0002] The Jinling Petrochemical Company's liquefied hydrocarbon spherical tank area is a supporting project for relocation and major overhauls and newly added production units over the years. Currently, the total tank capacity of the spherical tank area is 97,400 cubic meters. Located at No. 388 Ganjia Lane, Qixia District, Nanjing, bordering the Yangtze River to the north, the liquefied hydrocarbon spherical tank area was constructed and put into operation in 1985. The liquefied hydrocarbon spherical tank area was built to support the production of liquefied hydrocarbons in various units of the company, and stores a variety of types of hydrocarbons. (Reference) Figure 1 The spherical tank stores liquefied hydrocarbons. In the process of the spherical tank area, there are situations where the same storage tank can store different media and the same hydrocarbon pump can transport different media. It can meet the storage and transportation needs of different types of liquefied hydrocarbons during start-up, shutdown and maintenance, adjustment operations, and accident conditions. The hydrocarbon receiving and discharging lines are the inlet and outlet pipeline systems for liquefied hydrocarbons. However, in actual operation, leaks can occur during the transport of liquefied hydrocarbons, which are highly flammable and prone to fire. The space inside the spherical tanks where liquefied hydrocarbons are stored is also highly susceptible to fire. Steam heating is used to control the temperature of liquefied hydrocarbons to prevent them from freezing or evaporating too quickly, but if steam leaks and mixes with liquefied hydrocarbons, a fire may occur. Pneumatic valves are used to regulate the gas flow and pressure of liquefied hydrocarbons; when these valves malfunction, gas leaks may occur, potentially causing a fire. The air venting system is used to release the pressure inside the spherical tanks into the atmosphere through combustion or venting; when this system malfunctions, uncontrolled emissions of vented gas may occur. The flare system is used to burn excess gas and prevent its accumulation from causing an explosion, but improper operation or flare malfunction may result in unburned or leaked gas around the flare, potentially causing a fire.

[0003] Liquefied hydrocarbons are primarily C3 and C4 hydrocarbons. They are liquid under certain temperature and pressure conditions, but gaseous at room temperature and pressure due to their low boiling point. In their gaseous state, they are 1.5 to 2.0 times heavier than air and tend to accumulate on the ground and in low-lying areas. The saturated vapor pressure of liquefied hydrocarbons increases sharply with increasing temperature, and their expansion coefficient is relatively large, generally 10 to 16 times that of water, resulting in a volume expansion of approximately 300 times after vaporization. Liquefied hydrocarbons are extremely flammable and explosive petrochemical products. Their flash point is very low, below 0°C. The explosive concentration limits are also relatively wide, generally ranging from 1.5% to 12% (volume percentage).

[0004] Liquefied hydrocarbons can form explosive mixtures when mixed with air. They will explode or burn when exposed to sparks or high heat. They have the following characteristics: 1. They are extremely easy to cause fires; 2. They have a very high probability of explosion; 3. They are highly destructive; 4. They pose a risk of frostbite; 5. They can cause poisoning.

[0005] Because liquefied petroleum gas (LPG) is an extremely flammable and explosive medium, and the operating pressure of LPG pipelines and equipment is too high, a problem in any link during daily production can easily cause a large amount of LPG to leak. Moreover, the LPG spherical tank area is close to the Yangtze River, which makes it extremely easy for major safety accidents to occur, resulting in serious property damage, casualties, environmental damage and other catastrophic consequences.

[0006] The spherical tank is large in volume and has an irregular surface. The temperature distribution inside the tank is uneven. Traditional temperature sensors can only measure the temperature at a single point and cannot fully reflect the temperature distribution of the entire tank, which affects the accuracy of temperature monitoring. However, when measuring the surface temperature of the spherical tank, the temperature-sensing grating can provide distributed temperature data, making the temperature measurement more accurate.

[0007] Therefore, there is an urgent need for a fire protection system that can more accurately monitor temperature changes and take timely fire-fighting measures, thereby improving the efficiency and safety of fire response. Utility Model Content

[0008] To address the aforementioned issues, this invention provides a fire alarm linkage system based on a temperature-sensing grating. When the temperature-sensing grating operator detects an abnormal temperature, it immediately sends a signal to the fire alarm linkage system, triggering the fire sprinkler system to activate corresponding emergency measures to ensure personnel safety and reduce property damage.

[0009] The technical solution adopted in this utility model is:

[0010] A fire alarm linkage system based on a temperature-sensing grating includes multiple temperature-sensing gratings and a temperature-sensing grating operator station, a fire alarm linkage system, and a fire sprinkler system connected in sequence. The multiple temperature-sensing gratings and the temperature-sensing grating operator station are connected together.

[0011] Multiple temperature-sensing gratings are installed on each liquefied hydrocarbon spherical tank in the spherical tank area. The temperature-sensing grating operation station receives the detection signal of each temperature-sensing grating and measures the surface temperature of the spherical tank in real time. When the temperature exceeds the predetermined value, it outputs an abnormal signal to the fire linkage system. The fire linkage system outputs an activation signal to the fire sprinkler system, and the fire sprinkler system sprays water to extinguish the fire on the spherical tank.

[0012] Furthermore, the fire sprinkler system includes a water supply pipe, a deluge valve chamber, a fire water pipe, and sprinkler heads connected in sequence, with a deluge valve assembly installed in the deluge valve chamber;

[0013] The deluge valve assembly is used to control the flow of water from the water supply pipeline into the fire sprinkler pipe, and to start or stop the water supply. When the fire sprinkler system receives the start signal from the fire linkage system, the deluge valve assembly starts the water supply. The water flows in the fire sprinkler pipe and flows to the sprinkler head, where it sprays water to extinguish the fire. When the fire sprinkler system receives the stop signal from the fire linkage system, the deluge valve assembly stops the water supply.

[0014] Furthermore, the deluge valve assembly includes a deluge valve, which includes a valve body, a control chamber, a lower chamber, an upper chamber, a movable seat, a diaphragm, a pressure relief port, a drive rod, a valve disc, a valve disc locking rod, and a valve seat. The upper and lower chambers are both located within the valve body, and the control chamber is located on one side of the valve body. The control chamber is connected to the water supply pipe, and the upper chamber is connected to the fire water pipe. The pressure relief port and the movable seat are located within the control chamber. There are two diaphragms, which are symmetrically arranged on the movable seat. One end of the drive rod is located on the movable seat and clamped by the two diaphragms, while the other end is pressed against the valve disc locking rod. The valve seat is located within the lower chamber, and both the valve disc and the valve disc locking rod are mounted on the valve seat. The valve disc locking rod is pressed against the drive rod.

[0015] Water in the water supply pipe pushes the diaphragm in the control chamber, which in turn pushes the drive rod to press against the valve locking rod. The valve locking rod generates torque and locks the valve disc on the valve seat, preventing water from entering the upper chamber. When the fire sprinkler system receives the start signal from the fire linkage system, the pressure relief port of the control chamber releases the pressure in the control chamber. The torque of the drive rod on the valve locking rod is lower than the torque of the water on the valve disc, and the valve disc opens.

[0016] Furthermore, the deluge valve assembly also includes an anti-reset mechanism, a drainage pipe, a reset pipe, a start pipe, and an alarm test pipe. The anti-reset mechanism is connected to the deluge valve and the reset pipe, the start pipe is connected to the deluge valve, the deluge valve includes an alarm bell, and the alarm test pipe is connected to the alarm bell.

[0017] The drainage pipeline is used to drain the fire water that accumulates after the deluge valve is activated, and to reset the fire sprinkler system. The reset pipeline uses water flow to push the anti-reset mechanism to reset the deluge valve, returning it to its initial state. The start pipeline controls the automatic or manual start of the deluge valve. The alarm bell test pipeline is used to test whether the alarm bell is working properly.

[0018] Furthermore, the deluge valve assembly also includes deluge valve accessories, which consist of a solenoid valve, a deluge alarm valve, an inlet signal valve, a test signal valve, a manual opening valve, a hydraulic alarm bell, a drain valve, and a test drain valve. The solenoid valve is connected to the test signal valve and the deluge alarm valve, and the deluge alarm valve is connected to the inlet signal valve, the drain valve, the test drain valve, and the hydraulic alarm bell.

[0019] The solenoid valve is used to manually open the deluge valve; the deluge alarm valve is used to manually open the water supply and simultaneously output an alarm water flow signal; the inlet signal valve is used for water supply control, and outputs an electrical signal to the fire alarm system when the inlet signal valve is open or closed; the test signal valve is normally open, and outputs an electrical signal to the fire alarm system when the test signal valve is closed; the manual opening valve is used to manually open the deluge valve on-site during a fire; the hydraulic alarm bell is used to emit an audible signal when the deluge valve is open; the drain valve is used to drain water during fire sprinkler system maintenance; and the test drain valve is used to open and drain water during fire sprinkler system commissioning tests.

[0020] Furthermore, the valve disc is connected to a valve disc pin, a valve disc sealing ring, and a valve disc spring. The valve disc pin is used to fix the valve seat and the valve disc pin together. The valve disc sealing ring is used to form a sealing surface when the valve disc is closed, so as to prevent water leakage. The valve disc spring is used to open and close the valve disc.

[0021] Furthermore, a flow limiter is installed inside the control chamber to restrict the flow rate of the water.

[0022] Furthermore, the fire-fighting linkage system includes a fire-fighting linkage controller, a fire control room display device, transmission equipment, a fire electrical control device, and an emergency power supply for fire-fighting equipment. The fire-fighting linkage controller is connected to the temperature-sensing grating operator station, and the fire electrical control device is connected to the fire sprinkler system. The fire-fighting linkage controller receives abnormal signals from the temperature-sensing grating operator station and transmits the abnormal signals to the fire electrical control device through the transmission equipment. The fire electrical control device transmits a start signal to the fire sprinkler system. The fire control room display device displays the alarm information transmitted by the temperature-sensing grating operator station. The alarm information includes the label and location information of the liquefied hydrocarbon spherical tank with abnormal temperature and the abnormal temperature value. The emergency power supply for fire-fighting equipment is used for power supply.

[0023] Furthermore, each liquefied hydrocarbon spherical tank in the spherical tank area is covered with multiple temperature-sensing gratings on its outer surface, with the multiple temperature-sensing gratings being spaced equidistant from each other.

[0024] The beneficial effects of this utility model are:

[0025] 1. Significant economic benefits: Previously, when leaks or fires occurred in the LPG tank area, personnel at the tank sites could not detect them immediately, leading to delays in rescue efforts, escalation of the accident, and even secondary accidents, resulting in serious property damage to the company. After the upgrade, when a leak or fire occurs in a tank, the temperature-sensing grating captures abnormal temperature information in real time, linking with the fire protection system to promptly activate fire sprinklers to protect the tank equipment. At the same time, it can immediately alert personnel at the tank sites to take appropriate emergency measures, reducing property damage caused by sudden accidents and ensuring maximum company benefits.

[0026] 2. Significant safety benefits: In the past, when liquefied hydrocarbon spherical tanks experienced leaks or fires, personnel at the tank sites could not detect them immediately, leading to delays in rescue efforts and a high risk of major safety accidents. After the upgrade, the liquefied hydrocarbon spherical tanks are equipped with temperature-sensing gratings and a fire-fighting linkage system. If a leak or fire occurs in the tank, the temperature-sensing grating captures abnormal temperature information in real time, triggering an alarm and linking with the fire-fighting linkage system to activate fire sprinklers to protect the tank equipment. This ensures timely emergency response and handling, preventing the situation from escalating. Attached Figure Description

[0027] Figure 1This is a flow chart of an existing liquefied hydrocarbon spherical tank.

[0028] Figure 2 This is a block diagram of the fire protection system based on the temperature-sensing grating of a spherical tank according to this utility model.

[0029] Figure 3 This is a schematic cross-sectional view of the first structure of the rain shower valve of this utility model.

[0030] Figure 4 This is a schematic cross-sectional view of the second structure of the deluge valve of this utility model.

[0031] In the diagram, 1 is the valve body, 2 is the control chamber, 3 is the lower chamber, 4 is the upper chamber, 5 is the movable seat, 6 is the diaphragm, 61 is the diaphragm cover bolt, 7 is the pressure relief port, 8 is the drive rod, 9 is the valve disc, 91 is the valve disc pin, 92 is the valve disc spring, 93 is the valve disc sealing ring, 10 is the valve disc locking rod, 101 is the valve disc locking rod pin, 11 is the valve seat, 12 is the nose pin, 13 is the support bushing, 14 is the flow limiter, and 15 is the O-ring lubricant.

[0032] Figure 5 This is a schematic diagram of the structure of the rain shower valve assembly of this utility model.

[0033] In the diagram, 21 is a solenoid valve, 22 is a deluge alarm valve, 23 is a water inlet signal valve, 24 is a test signal valve, 25 is a manual opening valve, 26 is a hydraulic alarm bell, 27 is a drain valve, and 28 is a test drain valve.

[0034] Figure 6 This is a top view of the rain shower valve chamber of this utility model.

[0035] Figure 7 The working process diagram of the fire protection system of this utility model. Detailed Implementation

[0036] refer to Figure 2 This utility model provides a fire protection system based on a temperature-sensing grating, including multiple temperature-sensing gratings and a temperature-sensing grating operation station, a fire linkage system and a fire sprinkler system connected in sequence, wherein the multiple temperature-sensing gratings and the temperature-sensing grating operation station are connected.

[0037] Multiple temperature-sensing gratings are installed on each liquefied hydrocarbon spherical tank in the spherical tank area. The temperature-sensing grating operation station receives the detection signal of each temperature-sensing grating and measures the surface temperature of the spherical tank in real time. When the temperature exceeds the predetermined value, it outputs an abnormal signal to the fire linkage system. The fire linkage system outputs an activation signal to the fire sprinkler system, and the fire sprinkler system sprays water to extinguish the fire on the spherical tank.

[0038] Each liquefied hydrocarbon spherical tank in the spherical tank area has multiple temperature-sensing gratings installed on its outer surface, with equal spacing between them. Specifically, three temperature-sensing gratings are installed on the outer surface of the liquefied hydrocarbon spherical tank, respectively on the upper, middle, and lower halves of the tank. The temperature-sensing grating detection signals are connected to the temperature-sensing grating operation station to monitor the surface temperature of the spherical tank in real time and to link with the fire protection system. The fire sprinkler system includes pneumatic fire sprinkler valves A and B. Once the surface temperature of a spherical tank abnormally rises to 70°C, the temperature-sensing grating operation station in the spherical tank's central control room immediately triggers an alarm and outputs an abnormal signal to the fire protection linkage system. The fire sprinkler system automatically opens the corresponding pneumatic fire sprinkler valves A and B of the spherical tank to spray and cool the tank body, dilute and protect the leaking parts, and extinguish the fire.

[0039] The fire alarm linkage system includes equipment and components such as a fire alarm linkage controller, a fire control room display device, transmission equipment, fire electrical control devices, and an emergency power supply for fire equipment. The fire alarm linkage controller is connected to the temperature-sensing light grating operator station, and the fire electrical control device is connected to the fire sprinkler system. The fire alarm linkage controller receives abnormal signals from the temperature-sensing light grating operator station and transmits the abnormal signals to the fire electrical control device through the transmission equipment. The fire electrical control device transmits an activation signal to the fire sprinkler system. The fire control room display device displays the alarm information transmitted by the temperature-sensing light grating operator station. The alarm information includes the label and location information of the liquefied hydrocarbon spherical tank with abnormal temperature and the abnormal temperature value. The emergency power supply for fire equipment is used for power supply.

[0040] The fire sprinkler system includes a water supply pipe, a deluge valve chamber, a fire water pipe, and sprinkler heads connected in sequence. The deluge valve chamber contains a deluge valve assembly. The deluge valve assembly is used to control the water supply from the water supply pipe into the fire water pipe and to start or stop the water supply. When the fire sprinkler system receives the start signal from the fire linkage system, the deluge valve assembly starts the water supply. The water flows in the fire water pipe and to the sprinkler heads, where it sprays water to extinguish the fire.

[0041] refer to Figure 3The deluge valve assembly includes a deluge valve, which comprises a valve body 1, a control chamber 2, a lower chamber 3, an upper chamber 4, a movable seat 5, a diaphragm 6, a pressure relief port 7, a drive rod 8, a valve disc 9, a valve disc locking rod 10, and a valve seat 11. The upper chamber 4 and lower chamber 3 are both located within the valve body 1. The control chamber 2 is located on one side of the valve body 1 and is connected to a dedicated line from the water supply pipeline. The upper chamber 4 is connected to a fire hydrant pipe. The pressure relief port 7 and the movable seat 5 are located within the control chamber 2. There are two diaphragms 6, which are symmetrically arranged on the movable seat. One end of the drive rod 8 is set on the movable seat and is fixedly connected to the two diaphragms 6 through a flange. The other end is close to the valve disc locking rod 10. The valve seat 11 is set in the lower cavity 3. The valve disc 9 and the valve disc locking rod 10 are both installed on the valve seat 11. The valve disc locking rod 10 and the drive rod 8 are close together. The fire protection main line is laid from underground to upward. The lower cavity 3 is the water inlet and is connected to the water supply pipe. The upper cavity 4 is the water outlet.

[0042] Water in the water supply pipe pushes the diaphragm 6 in the control chamber 2, which in turn pushes the drive rod 8 to press against the valve locking rod 10. The valve locking rod 9 generates torque and locks the valve 9 onto the valve seat 11. Water in the lower chamber 3 cannot enter the upper chamber 4. When the fire sprinkler system receives the start signal of the fire linkage system, the pressure relief port of the control chamber 2 releases the pressure in the control chamber 2. The torque of the drive rod 8 on the valve locking rod 10 is lower than the torque of the water on the valve 9. The valve 9 opens, and water enters the upper chamber 4 from the lower chamber. Then, it flows through the fire water pipe to the sprinkler head for fire extinguishing.

[0043] refer to Figure 4 The valve disc 9 is connected to a valve disc pin 91, a valve disc sealing ring 93, a valve disc spring 92, and a valve disc locking rod pin 101. The valve disc pin 91 is used to fix the valve seat 11 and the valve disc pin 91. The valve disc sealing ring 93 is used to form a sealing surface by pressing the valve disc sealing ring 93 against the valve seat 11 when the valve disc 9 is closed, thus preventing water leakage. The valve disc spring 92 is used to open and close the valve disc 9. A flow limiter 14 is installed in the control chamber to limit the water flow rate. The valve disc locking rod 101 is connected to... There is a valve disc locking rod pin 101, which is used to lock the valve disc 9. The drive rod 8 is connected to a nose pin 12, which is used to connect the valve disc locking rod 10. The pressure relief port 7 is connected to a support bushing 13, which is used to connect the pressure relief pipe. The diaphragm 6 is connected to a diaphragm cover bolt 61, which is used to fix the diaphragm cover. The lower chamber 3 is provided with O-ring lubricating oil 15, which is used to lubricate the sealing O-ring. The O-ring is used to seal the lower chamber 3 of the deluge valve.

[0044] The deluge valve assembly includes an anti-reset mechanism, a drainage pipe, a reset pipe, a start pipe, and an alarm test pipe. The anti-reset mechanism is connected to the deluge valve and the reset pipe, and the start pipe is connected to the deluge valve. The deluge valve includes an alarm bell, and the alarm test pipe is connected to the alarm bell.

[0045] The drainage pipeline is used to drain the fire water that accumulates after the deluge valve is activated, and to reset the fire sprinkler system. The reset pipeline uses water flow to push the anti-reset mechanism to reset the deluge valve, returning it to its initial state. The start pipeline controls the automatic or manual start of the deluge valve. The alarm bell test pipeline is used to test whether the alarm bell is working properly.

[0046] refer to Figure 5 The deluge valve assembly also includes a solenoid valve 21, a deluge alarm valve 22, an inlet signal valve 23, a test signal valve 24, a manual opening valve 25, a hydraulic alarm bell 26, a drain valve 27, and a test drain valve 28. The solenoid valve 21 is connected to the test signal valve 24 and the deluge alarm valve 22. The test signal valve 24 is connected to the spherical tank, which is designated as TK-5201 in the figure. The deluge alarm valve 22 is connected to the inlet signal valve 23, the drain valve 27, the test drain valve 28, and the hydraulic alarm bell 26.

[0047] Solenoid valve 21 is used to open the deluge valve; deluge alarm valve 22 is used to manually open the water supply and simultaneously output an alarm water flow signal; inlet signal valve 23 is used for water supply control and outputs an electrical signal when the inlet signal valve is open or closed; test signal valve 24 is normally open and outputs an electrical signal when closed; test signal valve 24 can be closed manually or due to a malfunction; manual opening valve 25 is used to manually open the deluge valve on-site in case of fire; hydraulic alarm bell 26 is used to emit an audible signal when the deluge valve is open; drain valve 27 is used to drain water during fire sprinkler system maintenance; and test drain valve 28 is used to open and drain water during fire sprinkler system commissioning function tests.

[0048] refer to Figure 6 5201A, 5201B, 5202A, etc. are the tag numbers of the deluge valves. Multiple deluge valves are arranged in the deluge valve chamber. One spherical tank is equipped with two deluge valves, namely valve A and valve B. 700 and 500 are the distances (in millimeters) between the two deluge valves.

[0049] refer to Figure 7 The working process of this utility model is as follows:

[0050] When a fire occurs in the spherical tank, the temperature-sensing grating installed on the tank obtains the tank's temperature. The temperature-sensing grating operator station receives the temperature and detects an anomaly, outputting an abnormal signal to the fire alarm linkage system. The fire alarm linkage system then outputs a start signal to the fire sprinkler system, which sprays water onto the spherical tank to extinguish the fire. Alternatively, on-site personnel can manually press a button to output a start signal to the fire sprinkler system, activating solenoid valve 21. Solenoid valve 21 can also be manually activated using a button in the control room, opening the deluge valve. The deluge valve then sprays water onto the sprinkler heads to extinguish the fire. Alternatively, the deluge valve can be manually activated on-site in an emergency. Simultaneously, the hydraulic alarm bell 26 sounds an alarm. The inlet signal valve 23 is connected to the fire alarm linkage system. When the inlet signal valve 23 opens or closes, it outputs an electrical signal to the fire alarm linkage system. The inlet signal valve 23 is normally open and can be manually closed or closed in case of a malfunction.

[0051] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications are also within the protection scope of the present utility model.

Claims

1. A fire protection system based on a temperature-sensing grating, characterized in that, It includes multiple temperature-sensing gratings and temperature-sensing grating operation stations, fire linkage systems and fire sprinkler systems connected in sequence; the multiple temperature-sensing gratings and temperature-sensing grating operation stations are connected. Multiple temperature-sensing gratings are installed on each liquefied hydrocarbon spherical tank in the spherical tank area. The temperature-sensing grating operation station receives the detection signal of each temperature-sensing grating and measures the surface temperature of the spherical tank in real time. When the temperature exceeds the predetermined value, it outputs an abnormal signal to the fire linkage system. The fire linkage system outputs an activation signal to the fire sprinkler system, and the fire sprinkler system sprays water to extinguish the fire on the spherical tank.

2. The fire protection system based on a temperature-sensing grating according to claim 1, characterized in that, The fire sprinkler system includes a water supply pipe, a deluge valve chamber, a fire water pipe, and sprinkler heads connected in sequence. The deluge valve chamber contains a deluge valve assembly. The deluge valve assembly is used to control the flow of water from the water supply pipeline into the fire sprinkler pipe, and to start or stop the water supply. When the fire sprinkler system receives the start signal from the fire linkage system, the deluge valve assembly starts the water supply. The water flows in the fire sprinkler pipe and flows to the sprinkler head, where it sprays water to extinguish the fire. When the fire sprinkler system receives the stop signal from the fire linkage system, the deluge valve assembly stops the water supply.

3. A fire protection system based on a temperature-sensing grating according to claim 2, characterized in that, The deluge valve assembly includes a deluge valve, which includes a valve body (1), a control chamber (2), a lower chamber (3), an upper chamber (4), a movable seat (5), a diaphragm (6), a pressure relief port (7), a drive rod (8), a valve disc (9), a valve disc locking rod (10), and a valve seat (11). The upper chamber (4) and the lower chamber (3) are both located inside the valve body (1). The control chamber (2) is located on one side of the valve body (1). The control chamber (2) is connected to the water supply pipe, and the upper chamber (4) is connected to the fire water pipe. The pressure relief port... (7) and movable seat (5) are set in control cavity (2). There are 2 diaphragms (6). The two diaphragms (6) are symmetrically arranged on movable seat (5). One end of drive rod (8) is set on movable seat (5) and fixedly connected to the two diaphragms (6). The other end is close to valve locking rod (10). Valve seat (11) is set in lower cavity (3). Valve disc (9) and valve locking rod (10) are both installed on valve seat (11). Valve locking rod (10) and drive rod (8) are close together. Water in the water supply pipe pushes the diaphragm (6) in the control chamber (2), which in turn pushes the drive rod (8) to press against the valve locking rod (10). The valve locking rod (10) generates torque and locks the valve disc (9) on the valve seat (11). Water in the lower chamber (3) cannot enter the upper chamber (4). When the fire sprinkler system receives the start signal of the fire linkage system, the pressure relief port (7) of the control chamber (2) releases the pressure in the control chamber (2). The torque of the drive rod (8) on the valve locking rod (10) is lower than the torque of the water on the valve disc (9), and the valve disc (9) opens.

4. A fire protection system based on a temperature-sensing grating according to claim 3, characterized in that, The deluge valve assembly includes an anti-reset mechanism, a drain pipe, a reset pipe, a start pipe, and an alarm test pipe. The anti-reset mechanism is connected to the deluge valve and the reset pipe. The start pipe and the drain pipe are connected to the deluge valve. The deluge valve includes an alarm bell, and the alarm test pipe is connected to the alarm bell. The drainage pipe is used to drain the fire water that accumulates after the deluge valve is activated. The reset pipe uses water flow to push the anti-reset mechanism to reset the deluge valve, returning it to its initial state. The start pipe is used to control the automatic or manual start of the deluge valve. The alarm bell test pipe is used to test whether the alarm bell is working properly.

5. A fire protection system based on a temperature-sensing grating according to claim 1, characterized in that, The deluge valve assembly also includes deluge valve accessories, which consist of a solenoid valve (21), a deluge alarm valve (22), an inlet signal valve (23), a test signal valve (24), a manual opening valve (25), a hydraulic alarm bell (26), a drain valve (27), and a test drain valve (28). The solenoid valve (21) is connected to the test signal valve (24) and the deluge alarm valve (22). The deluge alarm valve (22) is connected to the inlet signal valve (23), the drain valve (27), the test drain valve (28), and the hydraulic alarm bell (26). Solenoid valve (21) is used to open deluge valve, deluge alarm valve (22) is used to manually open water supply and output alarm water flow signal at the same time, water inlet signal valve (23) is used for water supply control, and outputs electrical signal to fire linkage system when the water inlet signal valve is opened or closed, test signal valve (24) is in normally open state, and outputs electrical signal to fire linkage system when the test signal valve (24) is closed, manual opening valve (25) is used to manually open deluge valve on site in case of fire, hydraulic alarm bell (26) is used to emit sound signal when deluge valve is opened, drain valve (27) is used to drain water when fire sprinkler system is under maintenance, and test drain valve (28) is used to open drain water when fire sprinkler system is under commissioning function test.

6. A fire protection system based on a temperature-sensing grating according to claim 3, characterized in that, The valve disc (9) is connected to a valve disc pin (91), a valve disc sealing ring (93), and a valve disc spring (92). The valve disc pin (91) is used to fix the valve seat (11) and the valve disc pin (91). The valve disc sealing ring (93) is used to form a sealing surface when the valve disc (9) is closed, so that the valve disc sealing ring (93) is pressed against the valve seat (11) to prevent water leakage. The valve disc spring (92) is used to open and close the valve disc (9).

7. A fire protection system based on a temperature-sensing grating according to claim 3, characterized in that, A flow limiter (14) is installed inside the control chamber to limit the flow rate of water.

8. A fire protection system based on a temperature-sensing grating according to claim 1, characterized in that, The fire alarm linkage system includes a fire alarm linkage controller, a fire control room display device, transmission equipment, a fire electrical control device, and an emergency power supply for fire equipment. The fire alarm linkage controller is connected to the temperature-sensing light grating operator station, and the fire electrical control device is connected to the fire sprinkler system. The fire alarm linkage controller receives abnormal signals from the temperature-sensing light grating operator station and transmits the abnormal signals to the fire electrical control device through the transmission equipment. The fire electrical control device transmits an activation signal to the fire sprinkler system. The fire control room display device displays the alarm information transmitted by the temperature-sensing light grating operator station. The alarm information includes the label and location information of the liquefied hydrocarbon spherical tank with abnormal temperature and the abnormal temperature value. The emergency power supply for fire equipment is used for power supply.

9. A fire protection system based on a temperature-sensing grating according to claim 1, characterized in that, Each liquefied hydrocarbon spherical tank in the spherical tank area has multiple temperature-sensing gratings laid on its outer surface, with the gratings spaced equidistant from each other.

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