A method and system for extinguishing fires in a coal conveyor trestle

Abstract

The application provides a fire extinguishing method and system for a coal conveying trestle, and the method comprises the following steps: obtaining the length and width of the coal conveying trestle; obtaining the fire-fighting water volume of a single set of fire separation water curtain system and the first protectable trestle length; obtaining the second protectable trestle length of a single set of water spray system; dividing the coal conveying trestle according to the length of the coal conveying trestle, the first protectable trestle length and the second protectable trestle length to obtain a plurality of fire compartments; when a fire is detected in the coal conveying trestle, determining the first fire compartment where the fire is located, and controlling the water spray system in the first fire compartment and the fire separation water curtain system at both ends of the first fire compartment to start; determining the second fire compartment and controlling the water spray system in the second fire compartment and the fire separation water curtain system at both ends of the second fire compartment to start; the reliability of initial fire extinguishing and the accuracy of fire prevention and control are improved, and the economic cost of the fire prevention system of the coal conveying trestle is reduced.

Description

Technical Field

[0001] This invention relates to the field of fire extinguishing technology for coal conveyor bridges, and more particularly to a fire extinguishing method and system for coal conveyor bridges. Background Technology

[0002] The coal conveying system is the lifeline of a thermal power plant. Large thermal power plants typically share a single coal conveyor bridge between two or even four generating units. A fire on the coal conveyor bridge directly impacts the normal operation of the power plant, potentially leading to a complete shutdown and causing significant economic losses and adverse social impacts. Furthermore, fires on coal conveyor bridges are difficult to extinguish, and the reconstruction of destroyed facilities is slow. Therefore, implementing effective firefighting measures to minimize fire hazards and accurately and quickly extinguish fires in their early stages to ensure the safe operation of thermal power plants is a crucial aspect of fire protection design.

[0003] Existing coal conveyor trestle structures are typically made of steel, assembled on the ground or hoisted from above. Compared to traditional concrete structures, steel coal conveyor trestle structures are faster to construct, but they have poor fire resistance and are prone to softening and deformation when exposed to fire. Some steel coal conveyor trestle structures are even 300 or 400 meters long, posing an extremely high fire risk. Traditional fire prevention measures for steel coal conveyor trestle structures involve applying fire-retardant coatings to the steel structure, but this method is costly and its fire-resistant effect is not ideal. Moreover, when a fire occurs inside the enclosed trestle, a duct effect can easily form, causing the fire to rise and significantly increasing the difficulty for external rescue forces. Therefore, applying fire-retardant coatings is ineffective in addressing the impact of the duct effect on the fire. Summary of the Invention

[0004] This invention provides a fire extinguishing method and system for coal conveying trestle bridges, which implements open-type fire extinguishing measures for long-distance enclosed coal conveying trestle bridges, improving the reliability of initial fire extinguishing and the accuracy of fire prevention and control, and reducing the economic cost of coal conveying trestle bridge fire protection systems.

[0005] To address the aforementioned technical problems, this invention provides a fire extinguishing method for coal conveyor bridges, comprising:

[0006] Obtain the length and width of the coal conveyor bridge;

[0007] Obtain the fire water volume and the length of the first protectable trestle of a single fire-resistant water curtain system;

[0008] Obtain the length of the second protectable trestle for a single water spray system;

[0009] The coal conveying trestle is divided into several fire-prevention zones based on its length, the length of the first protectable trestle, and the length of the second protectable trestle. Each fire-prevention zone is equipped with a water spray system, and a fire-prevention water curtain system is installed between each fire-prevention zone and at both ends of the coal conveying trestle.

[0010] When a fire is detected on the coal conveying trestle, the location of the fire is determined to be in the first fire compartment, and the water spray system of the first fire compartment and the fire-resistant water curtain system at both ends of the first fire compartment are activated.

[0011] A second fire compartment is identified, and the water spray system of the second fire compartment and the fire-resistant water curtain system at both ends of the second fire compartment are controlled to be activated; wherein the second fire compartment is adjacent to the first fire compartment and is located in the fire spread direction of the first fire compartment.

[0012] This invention, based on parameters such as the length of the trestle, the trestle length that a single fire-resistant water curtain system can protect, and the number of water spray systems, rationally divides the coal conveyor trestle into fire-resistant zones. Each fire-resistant zone is equipped with a water spray system to suppress the fire within that zone. A fire-resistant water curtain system is installed between each fire-resistant zone and at each end of the coal conveyor trestle to inhibit the spread of fire and isolate the fire area from non-fire areas. By implementing this invention, when a fire occurs on the coal conveyor trestle, the water spray system and fire-resistant water curtain system of the fire-affected zone and adjacent fire-resistant zones are automatically activated. This enables the fire to be contained in its early stages, improves the reliability of initial fire suppression and the accuracy of fire prevention and control, and reduces the economic cost of the coal conveyor trestle's fire protection system.

[0013] Furthermore, obtaining the fire water volume and the length of the protective trestle for a single fire-resistant water curtain system includes:

[0014] Obtain the design spray intensity and design flow rate of a single water curtain nozzle for the fire-resistant partition water curtain system;

[0015] Calculate the fire water volume of a single fire-resistant water curtain system based on the width of the coal conveyor bridge and the design spray intensity of the fire-resistant water curtain system.

[0016] Based on the fire water volume of a single fire-resistant water curtain system and the design flow rate of a single water curtain nozzle, the length of the protective trestle of a single fire-resistant water curtain system is calculated to obtain the first protective trestle length.

[0017] Furthermore, the calculation of the fire-fighting water volume for a single fire-fighting water curtain system, based on the width of the coal conveyor bridge and the design spray intensity of the fire-fighting water curtain system, includes:

[0018] Based on the width of the coal conveyor bridge and the design spray intensity of the fire-resistant water curtain system, the fire water volume for a single fire-resistant water curtain system is calculated as follows:

[0019] Qa=Sa×B

[0020] In the formula, Qa represents the fire water volume of a single fire-resistant water curtain system, Sa represents the design spray intensity of the fire-resistant water curtain system, and B represents the width of the coal conveyor bridge.

[0021] Furthermore, the step of calculating the protectable bridge length of a single fire-resistant water curtain system based on the fire water volume of a single fire-resistant water curtain system and the design flow rate of a single water curtain nozzle, to obtain the first protectable bridge length, includes:

[0022] Based on the fire water volume of a single fire-resistant water curtain system and the design flow rate of a single water curtain nozzle, the number of water curtain nozzles in a single fire-resistant water curtain system is calculated as follows:

[0023]

[0024] In the formula, ta represents the number of water curtain nozzles in a single fire-resistant water curtain system, Qa represents the fire water volume of a single fire-resistant water curtain system, and qa represents the design flow rate of a single water curtain nozzle.

[0025] Based on the number of water curtain nozzles in a single fire-resistant water curtain system, the length of the protective trestle for a single fire-resistant water curtain system is calculated to obtain the first protective trestle length, as detailed below:

[0026] La = (na - 1) × la

[0027] In the formula, La represents the length of the protective trestle of a single fire-resistant water curtain system, i.e., the length of the first protective trestle; na represents the number of water nozzle rows in a single fire-resistant water curtain system. ta represents the number of water curtain nozzles in a single fire-resistant water curtain system, la represents the spacing between the water curtain nozzles, and B represents the width of the coal conveyor bridge.

[0028] This invention designs the distribution of water curtain nozzles for each fire-resistant water curtain system based on the fire water volume of a single fire-resistant water curtain system and the design flow rate of a single water curtain nozzle. This ensures that each fire-resistant water curtain system can completely cover the width of the trestle and calculates the length of the trestle it can protect. This is used to design and divide the coal conveying trestle into fire-resistant zones, thereby enabling precise fire extinguishing and fire isolation at specific fire locations, improving the accuracy and reliability of automatic fire extinguishing on the coal conveying trestle.

[0029] Furthermore, obtaining the second protectable trestle length of a single water spray system includes:

[0030] Obtain the available fire-fighting water volume for the coal conveyor trestle;

[0031] Obtain the design spray intensity of the water spray system;

[0032] Calculate the maximum fire flow rate of a single water spray system based on the available fire water volume of the coal conveyor bridge and the fire water volume of a single fire-resistant water curtain system.

[0033] Based on the width of the coal conveying trestle and the maximum fire flow rate of a single water spray system, the length of the trestle that can be protected by a single water spray system is calculated, and the length of the second protectable trestle is obtained.

[0034] Furthermore, obtaining the available fire-fighting water volume of the coal conveyor trestle includes:

[0035] Obtain the total flow rate of the fire pumps and the design flow rate of the fire hydrants on the coal conveyor trestle. Based on these figures, calculate the available fire water volume for the coal conveyor trestle, as follows:

[0036] Q1 = Q - Q2

[0037] In the formula, Q1 represents the available fire water volume of the coal conveying trestle, Q represents the total flow rate of the fire pumps of the coal conveying trestle, and Q2 represents the design flow rate of the fire hydrants of the coal conveying trestle.

[0038] Furthermore, the calculation of the maximum fire flow rate of a single water spray system based on the available fire water volume of the coal conveyor trestle and the fire water volume of a single fire-resistant water curtain system includes:

[0039] Based on the available fire-fighting water volume of the coal conveyor trestle and the fire-fighting water volume of a single fire-resistant water curtain system, the maximum fire-fighting flow rate of a single water spray system is calculated as follows:

[0040]

[0041] In the formula, Qb represents the maximum fire flow rate of a single water spray system, Q1 represents the available fire water volume of the coal conveyor bridge, and Qa represents the fire water volume of a single fire-resistant water curtain system.

[0042] Furthermore, the step of calculating the protectable length of a single water spray system based on the width of the coal conveying trestle and the maximum fire-fighting flow rate of a single water spray system, to obtain the second protectable trestle length, includes:

[0043] Based on the width of the coal conveyor trestle and the maximum fire-fighting flow rate of a single water spray system, the length of the trestle that can be protected by a single water spray system is calculated, and the length of the second protectable trestle is obtained, as follows:

[0044]

[0045] In the formula, Lb represents the length of the trestle that can be protected by a single water spray system, i.e., the length of the second trestle that can be protected; Qb represents the maximum fire flow rate of a single water spray system; Sb represents the design water spray intensity of the water spray system; and B represents the width of the coal conveying trestle.

[0046] This invention calculates the length of the coal conveying trestle that a single water spray system can protect based on parameters such as the available fire water volume of the coal conveying trestle, the fire water volume of the fire-prevention water curtain system, and the design spray intensity of the water spray system. This is used to design and divide the coal conveying trestle into fire-prevention zones, thereby enabling effective fire suppression in specific fire areas and improving the accuracy and reliability of the automatic fire suppression system for the coal conveying trestle.

[0047] Based on the above method embodiments, the present invention provides a corresponding system embodiment, which provides a fire extinguishing system for a coal conveying trestle, including: a trestle data module, a water curtain system module, a water spray system module, a fire compartment module, a first compartment module, and a second compartment module;

[0048] The trestle data module is used to obtain the length and width of the coal conveying trestle;

[0049] The water curtain system module is used to obtain the fire water volume of a single fire-resistant water curtain system and the length of the first protectable trestle.

[0050] The water spray system module is used to obtain the length of the second protectable trestle of a single water spray system;

[0051] The fire compartment module is used to divide the coal conveying trestle into several fire compartments based on the length of the coal conveying trestle, the length of the first protectable trestle, and the length of the second protectable trestle. Each fire compartment is equipped with a water spray system, and a fire-resistant water curtain system is installed between each fire compartment and at both ends of the coal conveying trestle.

[0052] The first partition module is used to determine the location of the fire in the first fire protection partition when a fire is detected on the coal conveying trestle, and to control the activation of the water spray system of the first fire protection partition and the fire-resistant water curtain system at both ends of the first fire protection partition.

[0053] The second partition module is used to determine the second fire compartment and control the activation of the water spray system of the second fire compartment and the fire-resistant water curtain system at both ends of the second fire compartment; wherein the second fire compartment is adjacent to the first fire compartment and is located in the fire spread direction of the first fire compartment.

[0054] Furthermore, the water curtain system module includes: a water curtain system data unit, a water curtain system fire-fighting water volume unit, and a water curtain system protection length unit;

[0055] The water curtain system data unit is used to obtain the design spray intensity of the fireproof partition water curtain system and the design flow rate of a single water curtain nozzle.

[0056] The fire-fighting water volume unit of the water curtain system is used to calculate the fire-fighting water volume of a single fire-resistant water curtain system based on the width of the coal conveying trestle and the design spray intensity of the fire-resistant water curtain system.

[0057] The water curtain system protection length unit is used to calculate the protectable bridge length of a single fire-resistant water curtain system based on the fire water volume of a single fire-resistant water curtain system and the design flow rate of a single water curtain nozzle, and to obtain the first protectable bridge length.

[0058] Furthermore, the fire-fighting water volume unit of the water curtain system includes:

[0059] The fire-fighting water volume unit of the water curtain system is used to calculate the fire-fighting water volume of a single fire-resistant water curtain system based on the width of the coal conveyor bridge and the design spray intensity of the fire-resistant water curtain system, as detailed below:

[0060] Qa=Sa×B

[0061] In the formula, Qa represents the fire water volume of a single fire-resistant water curtain system, Sa represents the design spray intensity of the fire-resistant water curtain system, and B represents the width of the coal conveyor bridge.

[0062] Furthermore, the water curtain system protection length unit includes: a nozzle quantity subunit and a length calculation subunit;

[0063] The nozzle quantity subunit is used to calculate the number of water curtain nozzles in a single fire-resistant water curtain system based on the fire water volume of a single fire-resistant water curtain system and the design flow rate of a single water curtain nozzle, as detailed below:

[0064]

[0065] In the formula, ta represents the number of water curtain nozzles in a single fire-resistant water curtain system, Qa represents the fire water volume of a single fire-resistant water curtain system, and qa represents the design flow rate of a single water curtain nozzle.

[0066] The length calculation subunit is used to calculate the protectable trestle length of a single fire-resistant water curtain system based on the number of water curtain nozzles in the system, and to obtain the first protectable trestle length, as follows:

[0067] La = (na - 1) × la

[0068] In the formula, La represents the length of the protective trestle of a single fire-resistant water curtain system, i.e., the length of the first protective trestle; na represents the number of water nozzle rows in a single fire-resistant water curtain system. ta represents the number of water curtain nozzles in a single fire-resistant water curtain system, la represents the spacing between the water curtain nozzles, and B represents the width of the coal conveyor bridge.

[0069] Furthermore, the water spray system module includes: a fire water volume unit, a water spray system data unit, a water spray system fire water volume unit, and a water spray system protection length unit;

[0070] The fire water volume unit is used to obtain the available fire water volume of the coal conveying trestle;

[0071] The water spray system data unit is used to obtain the design spray intensity of the water spray system;

[0072] The fire water volume unit of the water spray system is used to calculate the maximum fire flow of a single water spray system based on the available fire water volume of the coal conveying trestle and the fire water volume of a single fire-resistant water curtain system.

[0073] The water spray system protection length unit is used to calculate the protectable bridge length of a single water spray system based on the width of the coal conveying trestle and the maximum fire flow of a single water spray system, and to obtain the second protectable bridge length.

[0074] Furthermore, including:

[0075] The fire water volume unit is used to obtain the total flow rate of the fire pumps on the coal conveying trestle and the design flow rate of the fire hydrants on the coal conveying trestle, and to calculate the available fire water volume of the coal conveying trestle based on the total flow rate of the fire pumps and the design flow rate of the fire hydrants on the coal conveying trestle, as follows:

[0076] Q1 = Q - Q2

[0077] In the formula, Q1 represents the available fire water volume of the coal conveying trestle, Q represents the total flow rate of the fire pumps of the coal conveying trestle, and Q2 represents the design flow rate of the fire hydrants of the coal conveying trestle.

[0078] Furthermore, including:

[0079] The fire-fighting water volume unit of the water spray system is used to calculate the maximum fire-fighting flow rate of a single water spray system based on the available fire-fighting water volume of the coal conveyor trestle and the fire-fighting water volume of a single fire-resistant water curtain system, as detailed below:

[0080]

[0081] In the formula, Qb represents the maximum fire flow rate of a single water spray system, Q1 represents the available fire water volume of the coal conveyor bridge, and Qa represents the fire water volume of a single fire-resistant water curtain system.

[0082] Furthermore, the water spray system protects the length unit, including:

[0083] The water spray system protection length unit is used to calculate the protectable trestle length of a single water spray system based on the width of the coal conveyor trestle and the maximum fire flow rate of a single water spray system, and to obtain the second protectable trestle length, as follows:

[0084]

[0085] In the formula, Lb represents the length of the trestle that can be protected by a single water spray system, i.e., the length of the second trestle that can be protected; Qb represents the maximum fire flow rate of a single water spray system; Sb represents the design water spray intensity of the water spray system; and B represents the width of the coal conveying trestle. Attached Figure Description

[0086] Figure 1 : A flowchart of an embodiment of the fire extinguishing method for a coal conveyor bridge provided by the present invention;

[0087] Figure 2 : A structural diagram of an embodiment of the automatic water fire extinguishing system for a coal conveying trestle provided by the present invention;

[0088] Figure 3 : A structural diagram of an embodiment of the fire extinguishing system for a coal conveyor bridge provided by the present invention;

[0089] Figure 4 : A structural diagram of an embodiment of the water curtain system module provided by the present invention;

[0090] Figure 5 : A structural diagram of an embodiment of the water curtain system protection length unit provided by the present invention;

[0091] Figure 6 : A structural diagram of an embodiment of the water spray system module provided by the present invention. Detailed Implementation

[0092] The technical solutions of this invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0093] In the description of this application, it should be understood that the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first," "second," and "third" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "several" means two or more.

[0094] This invention provides a fire extinguishing method and system for coal conveying trestle bridges, which implements open-type fire extinguishing measures for long-distance enclosed coal conveying trestle bridges, improving the reliability of initial fire extinguishing and the accuracy of fire prevention and control, while reducing the economic cost of coal conveying trestle bridge fire protection systems.

[0095] Example 1

[0096] Based on the above requirements, one embodiment of the present invention provides a fire extinguishing method for a coal conveyor trestle, the method flow is as follows: Figure 1 As shown, the method includes steps S1 to S6, and the specific details of each step are as follows:

[0097] S1. Obtain the length and width of the coal conveying trestle.

[0098] This invention proposes to use an automatic water extinguishing system that combines a water spray system and a fireproof water curtain system to provide fire protection for long-distance enclosed steel structure trestle bridges. First, it is necessary to obtain the length L and width B of the coal conveying trestle bridge.

[0099] S2. Obtain the fire water volume and the length of the first protectable trestle of a single fire-resistant water curtain system. This step includes steps S2.1 to S2.3, each of which is detailed below:

[0100] S2.1 Obtain the design spray intensity of the fire-resistant water curtain system and the design flow rate of a single water curtain nozzle.

[0101] The fire-resistant water curtain system consists of open sprinkler heads, water curtain nozzles, and deluge alarm valve assemblies. When a fire occurs on the coal conveyor bridge, the fire-resistant water curtain system controls the open sprinkler heads or water curtain nozzles to start, spraying densely to form a water wall or water curtain, thus playing the role of fire-resistant isolation.

[0102] Obtain the design spray intensity and design flow rate of a single water curtain head for the fire-resistant water curtain system. According to Article 5.0.14 of the "Code for Design of Automatic Sprinkler Systems" (GB50084-2017), the design spray intensity of the fire-resistant water curtain system is Sa = 2L / (m·s).

[0103] The design flow rate of a single water curtain nozzle is determined based on the actual situation.

[0104] S2.2 Calculate the fire water volume of a single fire-resistant water curtain system based on the width of the coal conveyor bridge and the design spray intensity of the fire-resistant water curtain system.

[0105] Based on the width of the coal conveyor bridge and the design spray intensity of the fire-resistant water curtain system, the fire water volume for a single fire-resistant water curtain system is calculated as follows:

[0106] Qa=Sa×B

[0107] In the formula, Qa represents the fire water volume of a single fire-resistant water curtain system, in meters (m³). 3 / h; Sa represents the design spray intensity of the fire-resistant water curtain system, which is taken as Sa=2L / (m·s) according to the standard; B represents the width of the coal conveying trestle.

[0108] S2.3. Based on the fire water volume of a single fire-resistant water curtain system and the design flow rate of a single water curtain nozzle, calculate the length of the protectable trestle for a single fire-resistant water curtain system to obtain the first protectable trestle length. This step includes steps S2.3.1 to S2.3.2, each step as follows:

[0109] S2.3.1 Calculate the number of water curtain nozzles in a single fire-resistant water curtain system based on the fire water volume of a single fire-resistant water curtain system and the design flow rate of a single water curtain nozzle.

[0110] From Qa = qa × ta, we get:

[0111]

[0112] In the formula, ta represents the number of water curtain nozzles in a single fire-resistant water curtain system; Qa represents the fire water volume of a single fire-resistant water curtain system; and qa represents the design flow rate of a single water curtain nozzle, in L / min.

[0113] S2.3.2. Based on the number of water curtain nozzles in a single fire-resistant water curtain system, calculate the length of the protectable trestle of a single fire-resistant water curtain system to obtain the first protectable trestle length.

[0114] First, calculate the number of sprinkler rows na in a single fire-resistant water curtain system, from... have to:

[0115]

[0116] In the formula, na represents the number of water nozzle rows in a single fire-resistant water curtain system, ta represents the number of water curtain nozzles in a single fire-resistant water curtain system, and B represents the width of the coal conveyor bridge.

[0117] Then, the protectable trestle length of a single fire-resistant water curtain system is calculated to obtain the first protectable trestle length, as follows:

[0118] La = (na - 1) × la

[0119] In the formula, La represents the length of the protective trestle of a single fire-resistant water curtain system, i.e., the length of the first protective trestle, in meters (m); na represents the number of water nozzle rows in a single fire-resistant water curtain system. ta represents the number of water curtain nozzles in a single fire-resistant water curtain system, la represents the spacing between the water curtain nozzles in meters, and B represents the width of the coal conveyor bridge.

[0120] S3. Obtain the length of the second protectable trestle for a single water spray system. This step includes steps S3.1 to S3.4, each as follows:

[0121] S3.1 Obtain the available fire-fighting water volume of the coal conveyor trestle.

[0122] Obtain the total flow rate of the fire pumps and the design flow rate of the fire hydrants on the coal conveyor trestle. Based on these figures, calculate the available fire water volume for the coal conveyor trestle, as follows:

[0123] Q1 = Q - Q2

[0124] In the formula, Q1 represents the available fire-fighting water volume of the coal conveyor trestle, in meters (m³). 3 / h; Q represents the total flow rate of the fire pumps on the coal conveyor trestle, in m³ / h. 3 / h; Q2 represents the design flow rate of the fire hydrant on the coal conveyor trestle, in cubic meters per second (m³). 3 / h.

[0125] S3.2 Obtain the design spray intensity of the water spray system.

[0126] Based on actual conditions, the design spray intensity of the water spray system should be standardized.

[0127] S3.3. Based on the available fire water volume of the coal conveying trestle and the fire water volume of a single fire-resistant water curtain system, calculate the maximum fire flow rate of a single water spray system.

[0128] This invention proposes a fire extinguishing scheme that simultaneously activates two water spray systems and three fire-resistant water curtain systems: When a fire occurs on the coal conveyor trestle, the water spray system in the section where the fire originates and the fire-resistant water curtain systems at both ends are activated first. Then, depending on the development of the fire, the water spray system and fire-resistant water curtain system in one adjacent section are activated. Therefore, the available fire-fighting water volume of the coal conveyor trestle should meet the fire-fighting water demand for the simultaneous operation of two water spray systems and 2+1 fire-resistant water curtain systems.

[0129] Calculate the maximum fire flow rate of a single water spray system based on the available fire water volume of the coal conveyor trestle and the fire water volume of a single fire-resistant water curtain system.

[0130] From Q1=(2+1)×Qa+2×Qb, we get:

[0131]

[0132] In the formula, Qb represents the maximum fire-fighting flow rate of a single water spray system, in cubic meters per second (m³). 3 / h; Q1 represents the available fire-fighting water volume of the coal conveyor trestle, in meters. 3 / h; Qa represents the fire water volume of a single fire-resistant water curtain system, in meters. 3 / h.

[0133] S3.4. Based on the width of the coal conveying trestle and the maximum fire flow of a single water spray system, calculate the length of the trestle that can be protected by a single water spray system, and obtain the length of the second protectable trestle.

[0134] Based on the width of the coal conveying trestle and the maximum fire flow rate of a single water spray system, the length of the trestle that can be protected by a single water spray system is calculated, and the length of the second protectable trestle is obtained.

[0135] From Qb = Sb × Lb × B, we get:

[0136]

[0137] In the formula, Lb represents the length of the trestle that can be protected by a single water mist system, i.e., the length of the second protectable trestle, in meters (m); Qb represents the maximum fire flow rate of a single water mist system; and Sb represents the design spray intensity of the water mist system, in L / (min·m). 2 B represents the width of the coal conveying trestle.

[0138] S4. The coal conveying trestle is divided into several fire-prevention zones according to the length of the coal conveying trestle, the length of the first protectable trestle, and the length of the second protectable trestle. Each fire-prevention zone is equipped with a water spray system, and a fire-prevention water curtain system is installed between each fire-prevention zone and at both ends of the coal conveying trestle.

[0139] First, the coal conveying trestle is divided into several fire prevention zones based on its length, the length of the first protectable trestle, and the length of the second protectable trestle.

[0140] Assuming the entire coal conveyor trestle is divided into N fire compartments, the automatic water system of the trestle consists of N water spray systems and N+1 fire-resistant water curtain systems. The number of fire compartments N that the coal conveyor trestle needs to be divided into is calculated as follows:

[0141] From L=(N+1)×La+N×Lb, we get:

[0142]

[0143] In the formula, N represents the number of fire compartments in the entire coal conveying trestle; L represents the length of the coal conveying trestle; La represents the length of the trestle that can be protected by a single fire-resistant water curtain system, i.e., the first protected trestle length; and Lb represents the length of the trestle that can be protected by a single water spray system, i.e., the second protected trestle length.

[0144] Then, based on the calculated number N of fire compartments required, the coal conveyor trestle is divided into N fire compartments. Each fire compartment is protected by a water spray system. Adjacent fire compartments are separated by a fire-resistant water curtain system. A fire-resistant water curtain system is installed at each end of the coal conveyor trestle.

[0145] S5. When a fire is detected on the coal conveying trestle, determine that the fire is in the first fire protection zone, and control the activation of the water spray system of the first fire protection zone and the fire-resistant water curtain system at both ends of the first fire protection zone.

[0146] S6. Determine the second fire compartment and control the activation of the water spray system of the second fire compartment and the fire-resistant water curtain system at both ends of the second fire compartment; wherein the second fire compartment is adjacent to the first fire compartment and is located in the fire spread direction of the first fire compartment.

[0147] This embodiment also provides a specific example of a fire extinguishing method for a coal conveyor trestle:

[0148] This embodiment uses a coal conveying trestle in a coal-fired power plant as an example.

[0149] (1) Obtain the length L and width B of the coal conveying trestle. The coal conveying trestle is a closed steel structure trestle with a length L = 300m and a width B = 7.5m.

[0150] (2) Obtain the design spray intensity and design flow rate of a single water curtain nozzle for the fire-resistant partition water curtain system. According to the design specifications, the design spray intensity of the fire-resistant partition water curtain system is Sa = 2L / (m·s), and the design flow rate of a single water curtain nozzle is qa = 80L / min.

[0151] (3) Calculate the fire water volume Qa for a single fire-resistant water curtain system. Qa=Sa×B=2×7.5×3.6=54m 3 / h.

[0152] (4) Calculate the number of water curtain nozzles ta in a single fireproof water curtain system. For ease of arrangement, the number of water curtain nozzles in a single fire-resistant water curtain system is rounded up, so ta = 12.

[0153] (5) Calculate the number of water nozzle rows na for a single fireproof water curtain system. Row.

[0154] (6) Calculate the length of the protectable trestle of a single fire-resistant water curtain system to obtain the length of the first protectable trestle, La. The length of the first protectable trestle, La = (na-1) × la = (4-1) × 2.5 = 7.5m.

[0155] (7) Calculate the available fire-fighting water volume Q1 for the coal conveyor trestle. For this coal conveyor trestle, the total flow rate of the fire pumps on the coal conveyor trestle is Q = 600 m³ / s. 3 Given that the design flow rate of the fire hydrant on the coal conveyor trestle is Q2 = 40 L / s, the available fire-fighting water volume of the coal conveyor trestle is Q1 = Q - Q2 = 600 - 40 × 3.6 = 456 m³ / s. 3 / h.

[0156] (8) Calculate the maximum fire flow rate Qb of a single water spray system.

[0157] (9) Calculate the length of the trestle that can be protected by a single water spray system to obtain the length Lb of the second protectable trestle. For this coal conveying trestle, according to the design specifications, the design spray intensity of the water spray system is Sb = 10 L / (min· m2 If the length of the second protected trestle bridge is [not specified], then [the second protected trestle bridge length is not specified].

[0158] (10) Calculate the number N of fire protection zones that need to be divided for the coal conveying trestle. Rounding up, we get N = 8 fire compartments that need to be divided for the coal conveyor trestle.

[0159] (11) The coal conveyor trestle is divided into 8 fire compartments. A water spray system is installed in each fire compartment, and a fire-resistant water curtain system is installed between each fire compartment and at both ends of the coal conveyor trestle to obtain the automatic water extinguishing system of the coal conveyor trestle. Figure 2 As shown.

[0160] (12) When a fire is detected on the coal conveying trestle, determine that the fire is in the first fire protection zone, and control the activation of the water spray system of the first fire protection zone and the fire-resistant water curtain system at both ends of the first fire protection zone.

[0161] (13) Determine a second fire compartment, wherein the second fire compartment is adjacent to the first fire compartment and is located in the fire spread direction of the first fire compartment. Control and activate the water spray system of the second fire compartment and the fire-resistant water curtain system at both ends of the second fire compartment.

[0162] The implementation of the above embodiments of the present invention has the following beneficial effects:

[0163] This invention provides a fire extinguishing method for coal conveyor trestle bridges. Based on parameters such as the trestle bridge length, the trestle bridge length protected by a single fire-resistant water curtain system, and the number of single water spray systems, the coal conveyor trestle bridge is rationally divided into fire-resistant zones. Each fire-resistant zone is equipped with a water spray system to suppress the fire within that zone. Fire-resistant water curtain systems are installed between the fire-resistant zones and at both ends of the coal conveyor trestle bridge to inhibit fire spread and isolate fire-affected areas from non-fire-affected areas. This invention improves the reliability of initial fire suppression and the accuracy of fire prevention and control, while reducing the economic cost of the coal conveyor trestle bridge fire protection system.

[0164] Example 2

[0165] Based on the above embodiments, one embodiment of the present invention provides a fire extinguishing system for a coal conveyor trestle, comprising: a trestle data module 101, a water curtain system module 102, a water spray system module 103, a fire compartment module 104, a first compartment module 105, and a second compartment module 106. The system structure is as follows: Figure 3 As shown.

[0166] The trestle data module 101 is used to obtain the length and width of the coal conveying trestle.

[0167] The water curtain system module 102 is used to obtain the fire water volume of a single fire-resistant water curtain system and the length of the first protectable trestle.

[0168] The water spray system module 103 is used to obtain the length of the second protectable trestle of a single water spray system.

[0169] The fire compartment module 104 is used to divide the coal conveying trestle into several fire compartments according to the length of the coal conveying trestle, the length of the first protectable trestle, and the length of the second protectable trestle. Each fire compartment is equipped with a water spray system, and each fire compartment is connected to the other fire compartments and at both ends of the coal conveying trestle.

[0170] The first partition module 105 is used to determine the location of the fire in the first fire protection partition when a fire is detected on the coal conveying trestle, and to control the activation of the water spray system of the first fire protection partition and the fire-resistant water curtain system at both ends of the first fire protection partition.

[0171] The second partition module 106 is used to determine the second fire compartment and control the activation of the water spray system of the second fire compartment and the fire-resistant water curtain system at both ends of the second fire compartment; wherein the second fire compartment is adjacent to the first fire compartment and is located in the fire spread direction of the first fire compartment.

[0172] In one possible implementation, the water curtain system module 102 has the following structure: Figure 4 As shown, it includes: a water curtain system data unit 201, a water curtain system fire water volume unit 202, and a water curtain system protection length unit 203;

[0173] The water curtain system data unit 201 is used to obtain the design spray intensity of the fireproof partition water curtain system and the design flow rate of a single water curtain nozzle.

[0174] The fire-fighting water volume unit 202 of the water curtain system is used to calculate the fire-fighting water volume of a single fire-resistant water curtain system based on the width of the coal conveying trestle and the design spray intensity of the fire-resistant water curtain system.

[0175] The water curtain system protection length unit 203 is used to calculate the protectable bridge length of a single fire-resistant water curtain system based on the fire water volume of a single fire-resistant water curtain system and the design flow rate of a single water curtain nozzle, and to obtain the first protectable bridge length.

[0176] In one possible implementation, the water curtain system fire-fighting water volume unit 202 includes:

[0177] The fire-fighting water volume unit 202 of the water curtain system is used to calculate the fire-fighting water volume of a single fire-resistant water curtain system based on the width of the coal conveyor bridge and the design water spray intensity of the fire-resistant water curtain system, as follows:

[0178] Qa=Sa×B

[0179] In the formula, Qa represents the fire water volume of a single fire-resistant water curtain system, Sa represents the design spray intensity of the fire-resistant water curtain system, and B represents the width of the coal conveyor bridge.

[0180] In one possible implementation, the water curtain system protects the length unit 203, the unit structure of which is as follows: Figure 5 As shown, it includes: a nozzle quantity subunit 301 and a length calculation subunit 302;

[0181] The nozzle quantity subunit 301 is used to calculate the number of water curtain nozzles in a single fire-resistant water curtain system based on the fire water volume of a single fire-resistant water curtain system and the design flow rate of a single water curtain nozzle, as follows:

[0182]

[0183] In the formula, ta represents the number of water curtain nozzles in a single fire-resistant water curtain system, Qa represents the fire water volume of a single fire-resistant water curtain system, and qa represents the design flow rate of a single water curtain nozzle.

[0184] The length calculation subunit 302 is used to calculate the protectable trestle length of a single fire-resistant water curtain system based on the number of water curtain nozzles in the single fire-resistant water curtain system, and to obtain the first protectable trestle length, as follows:

[0185] La = (na - 1) × la

[0186] In the formula, La represents the length of the protective trestle of a single fire-resistant water curtain system, i.e., the length of the first protective trestle; na represents the number of water nozzle rows in a single fire-resistant water curtain system. ta represents the number of water curtain nozzles in a single fire-resistant water curtain system, la represents the spacing between the water curtain nozzles, and B represents the width of the coal conveyor bridge.

[0187] In one possible implementation, the water spray system module 103 has the following structure: Figure 6 As shown, it includes: fire water volume unit 401, water mist system data unit 402, water mist system fire water volume unit 403, and water mist system protection length unit 404;

[0188] The fire water volume unit 401 is used to obtain the available fire water volume of the coal conveying trestle;

[0189] The water spray system data unit 402 is used to obtain the design water spray intensity of the water spray system.

[0190] The fire water volume unit 403 of the water spray system is used to calculate the maximum fire flow of a single water spray system based on the available fire water volume of the coal conveying trestle and the fire water volume of a single fire-resistant water curtain system.

[0191] The water spray system protection length unit 404 is used to calculate the protectable bridge length of a single water spray system based on the width of the coal conveying trestle and the maximum fire flow of a single water spray system, and to obtain the second protectable bridge length.

[0192] In one possible implementation, the fire-fighting water supply unit 401 includes:

[0193] The fire water volume unit 401 is used to obtain the total flow rate of the fire pumps on the coal conveying trestle and the design flow rate of the fire hydrants on the coal conveying trestle, and to calculate the available fire water volume of the coal conveying trestle based on the total flow rate of the fire pumps on the coal conveying trestle and the design flow rate of the fire hydrants on the coal conveying trestle, as follows:

[0194] Q1 = Q - Q2

[0195] In the formula, Q1 represents the available fire water volume of the coal conveying trestle, Q represents the total flow rate of the fire pumps of the coal conveying trestle, and Q2 represents the design flow rate of the fire hydrants of the coal conveying trestle.

[0196] In one possible implementation, the water spray system fire-fighting water volume unit 403 includes:

[0197] The fire-fighting water volume unit 403 of the water spray system is used to calculate the maximum fire-fighting flow rate of a single water spray system based on the available fire-fighting water volume of the coal conveyor trestle and the fire-fighting water volume of a single fire-resistant water curtain system, as follows:

[0198]

[0199] In the formula, Qb represents the maximum fire flow rate of a single water spray system, Q1 represents the available fire water volume of the coal conveyor bridge, and Qa represents the fire water volume of a single fire-resistant water curtain system.

[0200] In one possible implementation, the water spray system protects the length unit 404, comprising:

[0201] The water spray system protection length unit 404 is used to calculate the protectable bridge length of a single water spray system based on the width of the coal conveying trestle and the maximum fire flow rate of a single water spray system, and to obtain the second protectable bridge length, as follows:

[0202]

[0203] In the formula, Lb represents the length of the trestle that can be protected by a single water spray system, i.e., the length of the second trestle that can be protected; Qb represents the maximum fire flow rate of a single water spray system; Sb represents the design water spray intensity of the water spray system; and B represents the width of the coal conveying trestle.

[0204] For a more detailed explanation of the working principle and procedures of this embodiment, please refer to the relevant description in Embodiment 1.

[0205] The implementation of the above embodiments of the present invention has the following beneficial effects:

[0206] The present invention provides a fire extinguishing system for coal conveying trestle, comprising: a trestle data module, a water curtain system module, a water spray system module, a fire compartment module, a first compartment module, and a second compartment module; it implements open-type fire extinguishing measures for long-distance enclosed coal conveying trestle, improving the reliability of initial fire extinguishing and the accuracy of fire prevention and control, and reducing the economic cost of the coal conveying trestle fire protection system.

[0207] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A fire extinguishing method for a coal conveyor trestle, characterized in that, include: Obtain the length and width of the coal conveyor bridge; Obtain the fire water volume of a single fire-resistant water curtain system and the length of the first protectable trestle; specifically, obtain the design spray intensity and design flow rate of a single water curtain nozzle of the fire-resistant water curtain system; calculate the fire water volume of a single fire-resistant water curtain system based on the width of the coal conveyor trestle and the design spray intensity of the fire-resistant water curtain system; details are as follows: In the formula, This indicates the fire water volume of a single fire-resistant water curtain system. Indicates the design water spray intensity of the fire-resistant water curtain system. The width of the coal conveying trestle is indicated; based on the fire water volume of a single fire-resistant water curtain system and the design flow rate of a single water curtain nozzle, the length of the trestle that can be protected by a single fire-resistant water curtain system is calculated to obtain the first protectable trestle length. Obtain the length of the second protectable trestle for a single water spray system; The coal conveying trestle is divided into several fire-prevention zones based on its length, the length of the first protectable trestle, and the length of the second protectable trestle. Each fire-prevention zone is equipped with a water spray system, and a fire-prevention water curtain system is installed between each fire-prevention zone and at both ends of the coal conveying trestle. When a fire is detected on the coal conveying trestle, the location of the fire is determined to be in the first fire compartment, and the water spray system of the first fire compartment and the fire-resistant water curtain system at both ends of the first fire compartment are activated. A second fire compartment is identified, and the water spray system of the second fire compartment and the fire-resistant water curtain system at both ends of the second fire compartment are controlled to be activated; wherein the second fire compartment is adjacent to the first fire compartment and is located in the fire spread direction of the first fire compartment.

2. The fire extinguishing method for a coal conveyor trestle as described in claim 1, characterized in that, The calculation of the protectable bridge length of a single fire-resistant water curtain system based on the fire water volume of a single fire-resistant water curtain system and the design flow rate of a single water curtain nozzle, to obtain the first protectable bridge length, includes: Based on the fire water volume of a single fire-resistant water curtain system and the design flow rate of a single water curtain nozzle, the number of water curtain nozzles in a single fire-resistant water curtain system is calculated as follows: In the formula, This indicates the number of water curtain nozzles in a single fire-resistant water curtain system. This indicates the fire water volume of a single fire-resistant water curtain system. This indicates the design flow rate of a single water curtain nozzle; Based on the number of water curtain nozzles in a single fire-resistant water curtain system, the length of the protective trestle for a single fire-resistant water curtain system is calculated to obtain the first protective trestle length, as detailed below: In the formula, This indicates the length of the trestle that can be protected by a single fire-resistant water curtain system, i.e., the length of the first protectable trestle. This indicates the number of rows of sprinklers in a single fire-resistant water curtain system. , This indicates the number of water curtain nozzles in a single fire-resistant water curtain system. Indicates the spacing between the water curtain nozzles. This indicates the width of the coal conveyor bridge.

3. A fire extinguishing method for a coal conveyor bridge as described in claim 1, characterized in that, The process of obtaining the second protectable trestle length for a single water spray system includes: Obtain the available fire-fighting water volume for the coal conveyor trestle; Obtain the design spray intensity of the water spray system; Calculate the maximum fire flow rate of a single water spray system based on the available fire water volume of the coal conveying trestle and the fire water volume of a single fire-resistant water curtain system. Based on the width of the coal conveyor trestle and the maximum fire flow rate of a single water spray system, the length of the trestle that can be protected by a single water spray system is calculated, and the length of the second protectable trestle is obtained.

4. A fire extinguishing method for a coal conveyor trestle as described in claim 3, characterized in that, The process of obtaining the available fire-fighting water volume for the coal conveyor trestle includes: Obtain the total flow rate of the fire pumps and the design flow rate of the fire hydrants on the coal conveyor trestle. Based on these figures, calculate the available fire water volume for the coal conveyor trestle, as follows: In the formula, This indicates the available fire-fighting water volume for the coal conveyor trestle. This indicates the total flow rate of the fire pumps on the coal conveyor trestle. This indicates the design flow rate of the fire hydrant on the coal conveyor trestle.

5. A fire extinguishing method for a coal conveyor trestle as described in claim 4, characterized in that, The calculation of the maximum fire flow rate of a single water spray system, based on the available fire water volume of the coal conveyor trestle and the fire water volume of a single fire-resistant water curtain system, includes: Based on the available fire-fighting water volume of the coal conveyor trestle and the fire-fighting water volume of a single fire-resistant water curtain system, the maximum fire-fighting flow rate of a single water spray system is calculated as follows: In the formula, This indicates the maximum fire-fighting flow rate of a single water spray system. This indicates the available fire-fighting water volume for the coal conveyor trestle. This indicates the fire water volume of a single fire-resistant water curtain system.

6. A fire extinguishing method for a coal conveyor trestle as described in claim 3, characterized in that, The calculation of the protectable trestle length of a single water spray system based on the width of the coal conveyor trestle and the maximum fire flow rate of a single water spray system, to obtain the second protectable trestle length, includes: Based on the width of the coal conveyor trestle and the maximum fire-fighting flow rate of a single water spray system, the length of the trestle that can be protected by a single water spray system is calculated, and the length of the second protectable trestle is obtained, as follows: In the formula, This indicates the length of the trestle that can be protected by a single water spray system, i.e., the length of the second protectable trestle. This indicates the maximum fire-fighting flow rate of a single water spray system. This indicates the design spray intensity of the water spray system. This indicates the width of the coal conveyor bridge.

7. A fire extinguishing system for a coal conveyor trestle, characterized in that, include: The trestle data module, water curtain system module, water spray system module, fire compartment module, first compartment module, and second compartment module; The trestle data module is used to obtain the length and width of the coal conveying trestle; The water curtain system module is used to obtain the fire water volume of a single fire-resistant water curtain system and the length of the first protectable trestle. The water curtain system module includes: a water curtain system data unit, a water curtain system fire water volume unit, and a water curtain system protection length unit; Water curtain system data unit, water curtain system fire water volume unit, and water curtain system protection length unit; The water curtain system data unit is used to obtain the design spray intensity of the fireproof partition water curtain system and the design flow rate of a single water curtain nozzle. The fire-fighting water volume unit of the water curtain system is used to calculate the fire-fighting water volume of a single fire-resistant water curtain system based on the width of the coal conveyor bridge and the design spray intensity of the fire-resistant water curtain system; specifically as follows: In the formula, This indicates the fire water volume of a single fire-resistant water curtain system. Indicates the design water spray intensity of the fire-resistant water curtain system. Indicates the width of the coal conveyor bridge; The water curtain system protection length unit is used to calculate the protectable bridge length of a single fire-resistant water curtain system based on the fire water volume of a single fire-resistant water curtain system and the design flow rate of a single water curtain nozzle, and to obtain the first protectable bridge length. The water spray system module is used to obtain the length of the second protectable trestle of a single water spray system; The fire compartment module is used to divide the coal conveying trestle into several fire compartments based on the length of the coal conveying trestle, the length of the first protectable trestle, and the length of the second protectable trestle. Each fire compartment is equipped with a water spray system, and a fire-resistant water curtain system is installed between each fire compartment and at both ends of the coal conveying trestle. The first partition module is used to determine the location of the fire in the first fire protection partition when a fire is detected on the coal conveying trestle, and to control the activation of the water spray system of the first fire protection partition and the fire-resistant water curtain system at both ends of the first fire protection partition. The second partition module is used to determine the second fire compartment and control the activation of the water spray system of the second fire compartment and the fire-resistant water curtain system at both ends of the second fire compartment; wherein the second fire compartment is adjacent to the first fire compartment and is located in the fire spread direction of the first fire compartment.

8. A fire extinguishing system for a coal conveyor trestle as described in claim 7, characterized in that, The water curtain system protection length unit includes: a nozzle quantity subunit and a length calculation subunit; The nozzle quantity subunit is used to calculate the number of water curtain nozzles in a single fire-resistant water curtain system based on the fire water volume of a single fire-resistant water curtain system and the design flow rate of a single water curtain nozzle, as detailed below: In the formula, This indicates the number of water curtain nozzles in a single fire-resistant water curtain system. This indicates the fire water volume of a single fire-resistant water curtain system. This indicates the design flow rate of a single water curtain nozzle; The length calculation subunit is used to calculate the protectable trestle length of a single fire-resistant water curtain system based on the number of water curtain nozzles in the system, and to obtain the first protectable trestle length, as follows: In the formula, This indicates the length of the trestle that can be protected by a single fire-resistant water curtain system, i.e., the length of the first protectable trestle. This indicates the number of rows of sprinklers in a single fire-resistant water curtain system. , This indicates the number of water curtain nozzles in a single fire-resistant water curtain system. Indicates the spacing between the water curtain nozzles. This indicates the width of the coal conveyor bridge.

9. A fire extinguishing system for a coal conveyor trestle as described in claim 7, characterized in that, The water spray system module includes: a fire water volume unit, a water spray system data unit, a water spray system fire water volume unit, and a water spray system protection length unit; The fire water volume unit is used to obtain the available fire water volume of the coal conveying trestle; The water spray system data unit is used to obtain the design spray intensity of the water spray system; The fire water volume unit of the water spray system is used to calculate the maximum fire flow of a single water spray system based on the available fire water volume of the coal conveying trestle and the fire water volume of a single fire-resistant water curtain system. The water spray system protection length unit is used to calculate the protectable bridge length of a single water spray system based on the width of the coal conveying trestle and the maximum fire flow of a single water spray system, and to obtain the second protectable bridge length.

10. A fire extinguishing system for a coal conveyor trestle as described in claim 9, characterized in that, The fire-fighting water volume unit includes: The fire water volume unit is used to obtain the total flow rate of the fire pumps on the coal conveying trestle and the design flow rate of the fire hydrants on the coal conveying trestle, and to calculate the available fire water volume of the coal conveying trestle based on the total flow rate of the fire pumps and the design flow rate of the fire hydrants on the coal conveying trestle, as follows: In the formula, This indicates the available fire-fighting water volume for the coal conveyor trestle. This indicates the total flow rate of the fire pumps on the coal conveyor trestle. This indicates the design flow rate of the fire hydrant on the coal conveyor trestle.

11. A fire extinguishing system for a coal conveyor trestle as described in claim 10, characterized in that, The fire-fighting water volume unit of the water spray system includes: The fire-fighting water volume unit of the water spray system is used to calculate the maximum fire-fighting flow rate of a single water spray system based on the available fire-fighting water volume of the coal conveyor trestle and the fire-fighting water volume of a single fire-resistant water curtain system, as detailed below: In the formula, This indicates the maximum fire-fighting flow rate of a single water spray system. This indicates the available fire-fighting water volume for the coal conveyor trestle. This indicates the fire water volume of a single fire-resistant water curtain system.

12. A fire extinguishing system for a coal conveyor trestle as described in claim 10, characterized in that, The water spray system protects the length unit, including: The water spray system protection length unit is used to calculate the protectable trestle length of a single water spray system based on the width of the coal conveyor trestle and the maximum fire flow rate of a single water spray system, and to obtain the second protectable trestle length, as follows: In the formula, This indicates the length of the trestle that can be protected by a single water spray system, i.e., the length of the second protectable trestle. This indicates the maximum fire-fighting flow rate of a single water spray system. This indicates the design spray intensity of the water spray system. This indicates the width of the coal conveyor bridge.

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