Double-backup fire extinguishing system and control method thereof

Abstract

The invention provides a double-backup type fire fighting system which comprises a water storage device, a fire fighting pipe network, an electric fire fighting pump set, a diesel fire fighting pump set, a PLC control system and a power supply system. The water storage device is connected with the electric fire pump set and the diesel fire pump set through the fire pipe network; the fire-fighting pressure-stabilizing pump set and the pressure-stabilizing pump control cabinet are connected with the fire-fighting pipe network pipeline, and the pressure-stabilizing pump control cabinet is electrically connected with the power supply system, the PLC control system and the fire-fighting pressure-stabilizing pump set; and the fire-fighting pipe network is also provided with a fire-fighting water main pipe pressure transmitter. The double-backup type fire extinguishing system is high in response speed and reliability, and the safety production management level can be effectively improved.

Description

Technical Field

[0001] The invention relates to a security system, and in particular to a fire water control system for a chemical production area. Background Art

[0002] Safety in production is of paramount importance, especially in the downstream industry of petrochemicals, which generally adopts process-based continuous production. The plant area is densely covered with various pipelines and storage tanks, and the responsibility for security is even greater. The main safety risk in this industry is fire alarm. The existing petrochemical security system mainly uses a fire pipe network connected to the water tank through a fire pump station. When an alarm is detected, the water pump works to spray water and cool the corresponding equipment to quickly extinguish the fire. However, since the petrochemical plant area is generally large, the volume of the fire pipe network has increased accordingly. In the existing technology, the fire pump station mainly relies on manual operation of the switch. When a fire alarm occurs, the response speed is slow, the pipe network pressure is unstable, and the reliability is not high, which poses certain safety hazards. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a dual-backup fire protection system with fast response speed and high reliability, which can effectively improve the level of production safety management.

[0004] To solve the above technical problems, the dual backup fire fighting system of the present invention comprises a water storage device connected to a water supply pipeline, and also comprises a fire fighting pipe network, an electric fire fighting pump group, a diesel fire fighting pump group, a PLC control system and a power supply system; it also comprises a liquid level gauge matched with the water storage device, and the PLC control system is electrically connected to the liquid level gauge and the solenoid valve on the water supply pipe; the water storage device is connected to the electric fire fighting pump group and the diesel fire fighting pump group via the fire fighting pipe network; it also comprises a fire fighting pressure stabilizing pump group and a pressure stabilizing pump control cabinet connected to the fire fighting pipe network pipeline, and the pressure stabilizing pump control cabinet is electrically connected to the power supply system, the PLC control system and the fire fighting pressure stabilizing pump group respectively; a first pressure transmitter is arranged on the fire fighting pipe network after the water outlet of the diesel fire fighting pump group, a second pressure transmitter is arranged on the fire fighting pipe network after the water outlet of the fire fighting pressure stabilizing pump group, a third pressure transmitter is arranged on the fire fighting pipe network after the water outlet of the electric fire fighting pump group, and a fire water main pressure transmitter is also arranged on the fire fighting pipe network.

[0005] The electric fire pump set includes an electric fire pump P-4001A and an electric fire pump P-4001B.

[0006] The diesel fire pump set includes a diesel fire pump P-4001C and a diesel fire pump P-4001D.

[0007] The fire-fighting pressure-stabilizing pump group includes a pressure-stabilizing pump P-4002A and a pressure-stabilizing pump P-4002B, and the pressure-stabilizing pump P-4002A and the pressure-stabilizing pump P-4002B are both electrically connected to the pressure-stabilizing pump control cabinet; the pressure-stabilizing pump P-4002A and the pressure-stabilizing pump P-4002B serve as backup for each other.

[0008] The power supply system includes a 380V main power supply, a 380V backup power supply, a 10kV main power supply, a 10kV backup power supply and a 220V AC power supply; the 380V main power supply, the 380V backup power supply, the 10kV main power supply, the 10kV backup power supply and the 220V AC power supply are all connected to a 0.4KV fire-fighting electric control system.

[0009] The control method of the dual backup fire protection system comprises the following steps: Step A: When the liquid level measurement value in the water storage device is lower than the set value, the PLC control system sends a signal to the solenoid valve, and the water supply pipeline replenishes water to the water storage device until the liquid level measurement value reaches the set value; Step B, when the fire water main pressure transmitter measured value is lower than the set value, the PLC control system sends a signal, and the fire pressure stabilizing pump group works until the fire water main pressure transmitter measured value reaches the set value; Step C, when the fire alarm sensing device installed in the production area sends an alarm signal, the PLC control system sends a signal, the fire-fighting pressure-stabilizing pump group is shut down, and the electric fire-fighting pump group and the diesel fire-fighting pump group start to transport fire-fighting water to the production area through the fire-fighting pipe network; the fire alarm sensing device includes a temperature sensor, a smoke sensor and a flame detector.

[0010] The step C comprises the following sub-steps: Step C1, first start the electric fire pump P-4001A; after 50 seconds, if the fire water main pressure transmitter measured value is less than or equal to 0.6MPa, interlock and start the electric fire pump P-4001B; Step C2: 50 seconds later, if the fire water main pressure transmitter measures a value less than or equal to 0.6 MPa, the diesel fire pump P-4001C is started by interlock. If the diesel fire pump P-4001C fails to start, the diesel fire pump P-4001D is automatically started.

[0011] The technical advantages of the present invention are embodied in the following aspects: ① Quick response: When a fire occurs, the fire pump can be started quickly, effectively shortening the fire extinguishing response time and improving the fire extinguishing efficiency. ② Stable water supply: The setting of the pressure-stabilizing pump ensures the stability of the pipe network pressure under non-fire conditions, and can also cooperate with the fire pump to work in time during a fire. ③ High reliability: Multiple backup and automatic switching mechanisms greatly reduce the risk of normal water supply due to system failure. ④ Easy to manage: The centralized monitoring and display functions enable operators to intuitively understand the system operation status, which is convenient for management and maintenance. ⑤ Strong adaptability: The adjustable parameter design enables it to adapt to fire-fighting sites of different sizes and needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the double backup fire fighting system of the present invention. DETAILED DESCRIPTION

[0013] The specific implementation modes of the present invention are further described below in conjunction with the accompanying drawings.

[0014] like Figure 1 It can be seen that the present invention provides a dual-backup fire protection system, including a water storage device 1 connected to a water supply pipeline, a fire protection pipe network, an electric fire pump group 2, a diesel fire pump group 3, a PLC control system 4 and a power supply system 5; it also includes a liquid level meter 10 matched with the water storage device 1, and the PLC control system 4 is electrically connected to the liquid level meter 10 and the solenoid valve 12 on the water supply pipeline; the water storage device 1 is connected to the electric fire pump group 2 and the diesel fire pump group 3 via the fire protection pipe network; it also includes a power supply system 5 connected to the fire protection pipe network pipeline. A fire-fighting pressure-stabilizing pump group 7 and a pressure-stabilizing pump control cabinet 70 are connected, and the pressure-stabilizing pump control cabinet 70 is electrically connected to the power supply system 5, the PLC control system 4, and the fire-fighting pressure-stabilizing pump group 7 respectively; a first pressure transmitter 31 is arranged on the fire-fighting pipe network after the water outlet of the diesel fire-fighting pump group 3, a second pressure transmitter 71 is arranged on the fire-fighting pipe network after the water outlet of the fire-fighting pressure-stabilizing pump group 7, a third pressure transmitter 21 is arranged on the fire-fighting pipe network after the water outlet of the electric fire-fighting pump group 2, and a fire water main pressure transmitter 8 is also arranged on the fire-fighting pipe network.

[0015] The water inlets of the electric fire pump group 2, the diesel fire pump group 3, and the fire pressure-stabilizing pump group 7 are all connected to the pipe of the water storage device 1, and the water outlets are all connected to the main pipe of the fire pipe network.

[0016] The fire-fighting system self-starting device integrates a series of advanced sensors and monitoring equipment. First, the high-precision liquid level meter 10 can monitor the liquid level in the water storage device 1 in real time and accurately. Once the liquid level is lower than the preset safety value, the solenoid valve 12 linked to it will automatically open to quickly replenish water and ensure sufficient reserve of fire-fighting water.

[0017] The electric fire pump set 2 includes an electric fire pump P-4001A and an electric fire pump P-4001B.

[0018] The diesel fire pump group 3 includes a diesel fire pump P-4001C and a diesel fire pump P-4001D. The diesel fire pump group 3 is connected to a PLC control system 4 and a power supply system 5 via a diesel fire pump group control cabinet 30 .

[0019] The fire-fighting pressure-stabilizing pump group 7 includes a pressure-stabilizing pump P-4002A and a pressure-stabilizing pump P-4002B, and the pressure-stabilizing pump P-4002A and the pressure-stabilizing pump P-4002B are both electrically connected to the pressure-stabilizing pump control cabinet 70; the pressure-stabilizing pump P-4002A and the pressure-stabilizing pump P-4002B serve as backup for each other.

[0020] The fire protection system integrates a series of advanced sensors and monitoring equipment. First, the high-precision fire water tank level gauge can monitor the liquid level in the fire water tank in real time and accurately. Once the liquid level is lower than the preset safety value, the linked fire water tank water replenishment electric valve will automatically open to quickly replenish water and ensure sufficient reserves of fire water.

[0021] The PLC control system 4 is the core brain of the entire device. It uses advanced algorithms and data analysis technology to quickly process and judge the data sent by the sensor. Once a fire is confirmed, a start command will be issued immediately. The first to respond is the electric fire pump group 2. If the electric fire pump group fails or cannot meet the water supply demand, the system will automatically switch to the diesel fire pump group 3 to ensure strong pressure and sufficient flow of fire water. The fire pressure regulating pump group 7 maintains the stability of the fire pipe network pressure in normal times, and can automatically adjust the working state according to the system instructions when a fire occurs.

[0022] The electric valve at the fire pump outlet will open with a delay according to the preset program to ensure smooth and effective water output.

[0023] In order to realize centralized control and remote operation, the present invention is also equipped with a multi-line control panel in the fire control room, where operators can conduct real-time monitoring and emergency intervention of the entire fire protection system.

[0024] The power supply system 5 includes a 380V main power supply, a 380V backup power supply, a 10kV main power supply, a 10kV backup power supply and a 220V AC power supply; the 380V main power supply, the 380V backup power supply, the 10kV main power supply, the 10kV backup power supply and the 220V AC power supply are all connected to a 0.4KV fire protection electric control system.

[0025] In terms of power supply guarantee, 380V backup power supply and 10kV backup power supply are on standby at any time through the 0.4KV fire control system - dual power switch cabinet, ensuring that the fire protection system can continue to operate stably when the main power supply fails. In addition, the 10kV fire control system - fire automatic inspection cabinet will regularly conduct automatic inspections on fire protection equipment to detect and eliminate potential faults in advance and ensure that the equipment can work normally at critical moments.

[0026] The control method of the dual backup fire protection system comprises the following steps: Step A: When the value measured by the liquid level meter 10 in the water storage device 1 is lower than the set value, the PLC control system 4 sends a signal to the solenoid valve 12, and the water supply pipeline replenishes water to the water storage device 1 until the value measured by the liquid level meter reaches the set value; Step B, when the fire water main pressure transmitter 8 measures a value lower than the set value, the PLC control system 4 sends a signal, and the fire pressure regulating pump group 7 works until the fire water main pressure transmitter 8 measures a value reaching the set value; Under non-firefighting conditions, the pressure-stabilizing pumps P-4002A and P-4002B have flexible control methods. Manual operation can be performed in the pressure-stabilizing pump control cabinet, and the automatic mode is regulated by the fire water main pressure transmitter 8. Through this design, the pipe network pressure of the stable high-pressure fire water supply system can be stably maintained above 0.7Mpa. When the pressure of the fire water main pressure transmitter 8 drops to 0.7MPa, the pressure-stabilizing pump P-4002A is automatically started. If it fails, it can automatically switch to the pressure-stabilizing pump P-4002B. When the pressure rises back to 1.0MPa, the pressure-stabilizing pumps P-4002A and P-4002B are stopped. It is worth mentioning that these two pressure-stabilizing pumps are used in a standby mode, and the main pump and the standby pump can operate alternately, realizing the effective utilization of resources and balanced wear of equipment.

[0027] Step C: When the fire alarm sensing device installed in the production area sends an alarm signal, the PLC control system 4 sends a signal, the fire-fighting pressure-stabilizing pump group 7 is shut down, and the electric fire pump group 2 and the diesel fire pump group 4 work to deliver fire water to the production area through the fire pipe network; the fire alarm sensing device includes temperature sensors, smoke sensors and flame detectors, etc., which can sense the occurrence of fire in all directions and at multiple angles. These sensors transmit real-time data to the central control system, namely the PLC control system 4.

[0028] The step C comprises the following sub-steps: Step C1, first start the electric fire pump P-4001A; after 50 seconds, if the value measured by the fire water main pressure transmitter 8 is less than or equal to 0.6MPa, interlock and start the electric fire pump P-4001B; Step C2, 50 seconds later, if the fire water main pressure transmitter 8 measures a value less than or equal to 0.6 MPa, the diesel fire pump P-4001C is started by interlocking. If the diesel fire pump P-4001C fails to start, the diesel fire pump P-4001D is automatically started.

[0029] In normal times, the PLC control system 4 can ensure that the fire pumps P-4001ABCD and the pressure-stabilizing pumps P-4002AB are in an automatic start-up state, ready to respond to possible fires at any time. At the same time, the touch screen of the PLC control cabinet can not only display the liquid level of the fire water tank, but also has low and high liquid level (adjustable) alarm functions. In addition, the operating status signals of the four pumps P-4001A, P-4001B, P-4001C, and P-4001D can be clearly displayed on the touch screen, which is convenient for monitoring and management. In addition, the PLC control cabinet can also control the opening of the water outlet electric valves of the four pumps and display their opening status. In the automatic state, the fire pump is started first, and after a delay of 20S (adjustable), a signal is output to open the electric valve on the water outlet pipe to ensure the orderly and stable operation of the system.

[0030] The specific implementation methods of the present invention include but are not limited to the above-mentioned embodiments. Without departing from the spirit and essence of the present invention, technicians familiar with the field can make various corresponding changes and modifications according to the present invention, but still fall within the protection scope of the present invention.

Claims

1. A double backup fire protection system, comprising a water storage device (1) connected to a water supply pipeline, a fire protection pipe network, an electric fire protection pump set (2), a diesel fire protection pump set (3), a PLC control system (4) and a power supply system (5); characterized in that: The invention also comprises a liquid level meter (10) matched with the water storage device (1), the PLC control system (4) being electrically connected to the liquid level meter (10) and the electromagnetic valve (12) on the water supply pipeline; the water storage device (1) being connected to the electric fire pump group (2) and the diesel fire pump group (3) via the fire pipe network; and also comprising a fire stabilizing pump group (7) and a pressure stabilizing pump control cabinet (70) connected to the fire pipe network pipeline, the pressure stabilizing pump control cabinet (70) being electrically connected to the power supply system (5), the PLC control system (4), and the fire stabilizing pump group (7) respectively; a first pressure transmitter (31) is arranged on the fire pipe network after the water outlet of the diesel fire pump group (3), a second pressure transmitter (71) is arranged on the fire pipe network after the water outlet of the fire stabilizing pump group (7), a third pressure transmitter (21) is arranged on the fire pipe network after the water outlet of the electric fire pump group (2), and a fire water main pressure transmitter (8) is also arranged on the fire pipe network.

2. The double backup fire fighting system according to claim 1, characterized in that: The electric fire pump set (2) comprises an electric fire pump P-4001A and an electric fire pump P-4001B.

3. The double backup fire fighting system according to claim 1, characterized in that: The diesel fire pump set (3) comprises a diesel fire pump P-4001C and a diesel fire pump P-4001D.

4. The double backup fire fighting system according to claim 1, characterized in that: The fire-fighting pressure-stabilizing pump group (7) comprises a pressure-stabilizing pump P-4002A and a pressure-stabilizing pump P-4002B, wherein the pressure-stabilizing pump P-4002A and the pressure-stabilizing pump P-4002B are both electrically connected to a pressure-stabilizing pump control cabinet (70); the pressure-stabilizing pump P-4002A and the pressure-stabilizing pump P-4002B serve as backup for each other.

5. The dual backup fire fighting system according to claim 1, characterized in that: The power supply system (5) comprises a 380V main power supply, a 380V backup power supply, a 10kV main power supply, a 10kV backup power supply and a 220V main power supply; the 380V main power supply, the 380V backup power supply, the 10kV main power supply, the 10kV backup power supply and the 220V main power supply are all connected to a 0.4KV fire protection electric control system.

6. The control method of the dual backup fire protection system according to claim 1, comprising the following steps: Step A: When the value measured by the liquid level meter (10) in the water storage device (1) is lower than the set value, the PLC control system (4) sends a signal to the solenoid valve (12), and the water supply pipeline replenishes water to the water storage device (1) until the value measured by the liquid level meter reaches the set value; Step B, when the value measured by the fire water main pressure transmitter (8) is lower than the set value, the PLC control system (4) sends a signal, and the fire pressure stabilizing pump group (7) works until the value measured by the fire water main pressure transmitter (8) reaches the set value; Step C: When the fire alarm sensing device arranged in the production area sends out an alarm signal, the PLC control system (4) sends out a signal, the fire-fighting pressure-stabilizing pump group (7) is shut down, and the electric fire-fighting pump group (2) and the diesel fire-fighting pump group (4) start to transport fire-fighting water to the production area through the fire-fighting pipe network; the fire alarm sensing device includes a temperature sensor, a smoke sensor and a flame detector.

7. The control method of the dual backup fire fighting system according to claim 6, characterized in that: The step C comprises the following sub-steps: Step C1, first start the electric fire pump P-4001A; after 50 seconds, if the fire water main pressure transmitter (8) measures a value less than or equal to 0.6MPa, interlock and start the electric fire pump P-4001B; Step C2, 50 seconds later, if the fire water main pressure transmitter measures (8) a value less than or equal to 0.6 MPa, the diesel fire pump P-4001C is started by interlock. If the diesel fire pump P-4001C fails to start, the diesel fire pump P-4001D is automatically started.

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