Fixed fire extinguishing system and use method thereof

Abstract

The invention discloses a fixed fire extinguishing system and a using method thereof.The fixed fire extinguishing system comprises a foam storage tank, a water storage tank, a mixer communicating with the foam storage tank and the water storage tank, a fire extinguishing cannon connected with the mixer and a driving device, and the foam storage tank communicates with the mixer through a first pipeline; the water storage tank is communicated with the mixer through a first pipeline, the water storage tank is communicated with the mixer through a second pipeline, the driving device comprises a gear pump arranged on the first pipeline, a centrifugal pump arranged on the second pipeline and a diesel pump, and the diesel pump coaxially drives the gear pump and the centrifugal pump; the device is simple in structure, the flow and pressure of the system are stable, the foam mixing ratio can be accurately controlled, the fire extinguishing efficiency of a fixed fire extinguishing system is improved, and the device can be widely applied to various dangerous goods places such as petroleum, petrifaction, electric power, hazardous chemicals and military industry.

Description

Technical Field

[0001] The present invention relates to the field of fire fighting technology, and in particular to a fixed fire extinguishing system and a use method thereof. Background Art

[0002] The working principle of the foam type automatic fire fighting water bubble system is to mix the foam fire extinguishing agent and water in a certain proportion through a pressure type foam proportion mixing device, and produce an air foam that can float and adhere to the surface of combustible and flammable liquids or solids, or accumulate and fill the space of a certain burning material through a foam generating (injection, spraying) device, which plays the role of isolation, cooling and suffocation to extinguish the burning material.

[0003] The foam-type automatic fire-fighting water bubble fire extinguishing system can be divided into fixed, semi-fixed and mobile types according to its use mode; according to the foam spraying mode, there are liquid spraying, liquid spraying and spraying modes, and of course the automatic type is also indispensable; the foam-type automatic fire-fighting water bubble can be divided into low, medium and high times according to the foam expansion multiple. The foam-type automatic fire-fighting water bubble fire extinguishing system is currently the most effective fire extinguishing system for fighting large-area liquid fires of Class B in petroleum, chemical enterprises, oil depots and underground garages.

[0004] Existing fire pumps, such as the patented double-connected isobaric centrifugal foam fire pump, completely ignore the fact that in addition to the rotation speed, another factor that affects the outlet pressure of the centrifugal pump is the change in water flow rate. In addition, there is no public selection of related pumps, resulting in the inability to guarantee the mixing ratio of foam and water.

[0005] In order to solve the above technical problems, the present invention provides a fixed fire extinguishing system and a method of using the same to solve the problem that the previous fire extinguishing system cannot ensure the mixing ratio of foam and water, resulting in poor fire extinguishing effect. Summary of the invention

[0006] The object of the present invention is to provide a fixed fire extinguishing system and a method of using the same, so as to solve the problems existing in the above-mentioned prior art, so that the ratio of foam to water can be controlled, thereby improving the fire extinguishing effect.

[0007] To achieve the above object, the present invention provides the following solutions:

[0008] A fixed fire extinguishing system comprises a foam storage tank, a water storage tank, a mixer respectively connected to the foam storage tank and the water storage tank, a fire extinguishing gun connected to the mixer, and a driving device, wherein the foam storage tank is connected to the mixer through a first pipe, the water storage tank is connected to the mixer through a second pipe, and the driving device comprises a gear pump arranged on the first pipe, a centrifugal pump arranged on the second pipe, and a diesel pump, and the diesel pump coaxially drives the gear pump and the centrifugal pump.

[0009] Preferably, a pressure-sustained valve is provided on the second pipeline.

[0010] Preferably, a plurality of fire extinguishing guns are provided, and the fire extinguishing guns are connected to the mixers respectively.

[0011] A method for using a fixed fire extinguishing system comprises the following steps:

[0012] Start the diesel engine and run it at a constant speed n. At this time, the foam flow rate pumped by the gear pump is Q2;

[0013] By setting the pressure holding point P1 of the centrifugal pump outlet pressure holding valve, the water supply flow of the centrifugal pump is limited to Q1, and the flow rate Q1 of the centrifugal pump is made to be the design multiple of the gear pump flow rate Q2;

[0014] The foam flow and the water flow are mixed in the mixer at a flow rate of Q3, and are sprayed through a fire extinguishing cannon;

[0015] The total flow rate within the rated working range of the fire extinguishing gun shall not be less than Q3.

[0016] Preferably, the foam mixing ratio is 1% or 3% or 6%.

[0017] Preferably, the water supply flow rate is the sum of Q1 and the gear pump flow rate Q2, which is equal to Q3.

[0018] Compared with the prior art, the present invention has achieved the following technical effects:

[0019] The equipment of the present invention has a simple structure, stable system flow and pressure, and can accurately control the foam mixing ratio, thereby improving the fire extinguishing efficiency of the fixed fire extinguishing system. It can be widely used in various dangerous goods places such as petroleum, petrochemical, electric power, hazardous chemicals, and military industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 is a system diagram of the present invention;

[0022] Figure 2 It is a detailed structural diagram of the present invention;

[0023] Figure 3 This is a conventional outlet pressure / flow curve of a certain type of centrifugal pump;

[0024] Figure 4This is a conventional outlet pressure / flow curve of a certain type of gear pump;

[0025] Figure 5 This is a conventional inlet pressure / flow curve of a certain type of fire extinguishing gun;

[0026] Figure 6 This is a conventional inlet flow / range curve of a certain type of fire extinguishing gun;

[0027] Among them, 1. Foam storage tank; 2. Water storage tank; 3. Gear pump; 4. Fire extinguisher; 5. Mixer; 6. Pressure holding valve; 7. Diesel pump; 8. Centrifugal pump. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] The object of the present invention is to provide a fixed fire extinguishing system and a method of using the same, so as to solve the problems existing in the above-mentioned prior art, so that the ratio of foam to water can be controlled, thereby improving the fire extinguishing effect.

[0030] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] refer to Figure 1 to Figure 2 A fixed fire extinguishing system comprises a foam storage tank, a water storage tank, a mixer respectively connected to the foam storage tank and the water storage tank, a fire extinguishing gun connected to the mixer, and a driving device, wherein the foam storage tank is connected to the mixer through a first pipe, and the water storage tank is connected to the mixer through a second pipe, and the driving device comprises a gear pump arranged on the first pipe, a centrifugal pump arranged on the second pipe, and a diesel pump, and the diesel pump coaxially drives the gear pump and the centrifugal pump; the equipment of the present invention has a simple structure, stable flow and pressure of the system, and can accurately control the foam mixing ratio, thereby improving the fire extinguishing efficiency of the fixed fire extinguishing system, and can be effectively applied to the fire protection system of a large oil depot.

[0032] refer to Figure 1, an adjustable, standard pressure-holding valve is installed on the second pipeline; the pressure-holding valve can effectively limit the water flow of the system to ensure the pressure-holding point and thus ensure a constant water flow, but if the water consumption of the system is too small due to unreasonable system design, and the water pressure of the system is very high, the pressure-holding valve will not work. Therefore, it is necessary to first confirm the matching range of the flow / pressure / range parameters of the fire-fighting gun (for example, after holding the pressure, the flow will be reduced to a certain extent, resulting in a deviation of the water drop point, but the angle can be adjusted to compensate for the range reduction), and the total flow of multiple fire-fighting guns. Therefore, the flow / range of the fire-fighting gun design should have redundancy, that is, the total flow within the rated working range of the fire-fighting gun should not be less than Q3, and the flow point at Q3 should meet its range requirements.

[0033] Furthermore, the purpose of controlling Q3 can also be achieved by reasonably increasing / decreasing P1 and Q2 of the centrifugal pump.

[0034] refer to Figure 1 , multiple fire extinguishing guns are connected to the mixer respectively.

[0035] A method for using a fixed fire extinguishing system comprises the following steps:

[0036] Start the diesel engine and run it at a constant speed n. At this time, the foam flow rate pumped by the gear pump (also known as a positive displacement pump) is Q2;

[0037] By setting the pressure holding point P1 of the centrifugal pump outlet pressure holding valve, the water supply flow of the centrifugal pump is limited to Q1, and the flow rate Q1 of the centrifugal pump is made to be the design multiple of the gear pump flow rate Q2;

[0038] Among them, the selection of the gear pump is determined according to the Q1 and speed n of the centrifugal pump;

[0039] The flow rate of the foam flow and the water flow mixed in the mixer is Q3, and is sprayed through the fire extinguishing gun, wherein the total flow rate within the rated working range of the fire extinguishing gun should not be less than Q3.

[0040] Furthermore, the foam mixing ratio is 1% or 3% or 6%. When the system requires the foam mixing ratio to be 1%, the centrifugal pump flow rate Q1 is 99 times the gear pump flow rate Q2.

[0041] Furthermore, the water supply flow rate is the sum of Q1 and the gear pump flow rate Q2, which is equal to Q3.

[0042] refer to Figures 3 to 6This method uses a diesel engine to coaxially drive a centrifugal pump and a gear (displacement) pump, two liquid pumps with different characteristics. By adjusting the speed n of the diesel engine and running it at a constant speed, the speed n makes the flow rate Q2 of the gear pump constant; the holding pressure point P1 of the centrifugal pump outlet pressure holding valve is adjusted to limit the flow rate of the centrifugal pump to Q1, and the flow rate Q1 of the centrifugal pump is 99 times the flow rate Q2 of the gear pump (when the system requires a foam mixing ratio of 1%); the outlet pressure P2 of the gear (displacement) pump is slightly higher than the outlet pressure of the centrifugal pump due to the adaptive pipeline characteristics, and the foam is injected into the mixer, and the flow rate after mixing is Q3 (for example, the design is 400m 3 ); According to the inlet pressure of the fire extinguisher (assuming 1MPa) / flow rate (assuming 4 100m 3 =Q3 / 4 of the fire extinguishing gun) and the characteristics of the inlet pressure (1MPa) / range (80m), the elevation angle / falling point of each fire extinguishing gun is adjusted respectively to meet the coverage of the fixed fire extinguishing gun.

[0043] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A fixed fire extinguishing system, characterized in that: The invention comprises a foam storage tank, a water storage tank, a mixer respectively connected to the foam storage tank and the water storage tank, a fire extinguishing gun connected to the mixer, and a driving device, wherein the foam storage tank is connected to the mixer through a first pipe, the water storage tank is connected to the mixer through a second pipe, and the driving device comprises a gear pump arranged on the first pipe, a centrifugal pump arranged on the second pipe, and a diesel pump, and the diesel pump coaxially drives the gear pump and the centrifugal pump.

2. A fixed fire extinguishing system according to claim 1, characterized in that: The second pipeline is provided with a pressure-maintaining valve.

3. A fixed fire extinguishing system according to claim 1, characterized in that: A plurality of fire extinguishing guns are provided, and each of the fire extinguishing guns is connected to the mixer respectively.

4. A method for using a fixed fire extinguishing system, characterized in that: The fixed fire extinguishing system according to any one of claims 1 to 3 comprises the following steps: Start the diesel engine and run it at a constant speed n. At this time, the foam flow rate pumped by the gear pump is Q2; By setting the pressure holding point P1 of the centrifugal pump outlet pressure holding valve, the water supply flow of the centrifugal pump is limited to Q1, and the flow rate Q1 of the centrifugal pump is made to be the design multiple of the gear pump flow rate Q2; The foam flow and the water flow are mixed in the mixer at a flow rate of Q3, and are sprayed through a fire extinguishing cannon; The total flow rate within the rated working range of the fire extinguishing gun shall not be less than Q3.

5. The method for using a fixed fire extinguishing system according to claim 4, characterized in that: The foam mixing ratio is 1% or 3% or 6%.

6. The method for using a fixed fire extinguishing system according to claim 4, characterized in that: The water supply flow rate is the sum of Q1 and the gear pump flow rate Q2, which is equal to Q3.

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