CN114432631B - Automatic water spraying fire extinguishing system and fire extinguishing method for cooling tower - Google Patents
Automatic water spraying fire extinguishing system and fire extinguishing method for cooling tower Download PDFInfo
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- CN114432631B CN114432631B CN202210027479.2A CN202210027479A CN114432631B CN 114432631 B CN114432631 B CN 114432631B CN 202210027479 A CN202210027479 A CN 202210027479A CN 114432631 B CN114432631 B CN 114432631B
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C31/00—Delivery of fire-extinguishing material
- A62C31/02—Nozzles specially adapted for fire-extinguishing
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C31/00—Delivery of fire-extinguishing material
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C31/00—Delivery of fire-extinguishing material
- A62C31/28—Accessories for delivery devices, e.g. supports
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C37/00—Control of fire-fighting equipment
- A62C37/36—Control of fire-fighting equipment an actuating signal being generated by a sensor separate from an outlet device
- A62C37/38—Control of fire-fighting equipment an actuating signal being generated by a sensor separate from an outlet device by both sensor and actuator, e.g. valve, being in the danger zone
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28C—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA COME INTO DIRECT CONTACT WITHOUT CHEMICAL INTERACTION
- F28C1/00—Direct-contact trickle coolers, e.g. cooling towers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F25/00—Component parts of trickle coolers
- F28F25/02—Component parts of trickle coolers for distributing, circulating, and accumulating liquid
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F25/00—Component parts of trickle coolers
- F28F25/02—Component parts of trickle coolers for distributing, circulating, and accumulating liquid
- F28F25/04—Distributing or accumulator troughs
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F25/00—Component parts of trickle coolers
- F28F25/02—Component parts of trickle coolers for distributing, circulating, and accumulating liquid
- F28F25/06—Spray nozzles or spray pipes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Health & Medical Sciences (AREA)
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- Emergency Management (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Fire-Extinguishing By Fire Departments, And Fire-Extinguishing Equipment And Control Thereof (AREA)
Abstract
The invention discloses an automatic water spraying fire extinguishing system of a cooling tower and a fire extinguishing method, wherein a pressure stabilizing device is arranged on a water outlet pipeline of a water tank, a check valve, a first fire pump, a second fire pump, a first pressure switch and a rain alarm valve group are arranged on the water outlet pipeline of the cooling tower, and an open type spray head, a fire detector and a closed type spray head are arranged in the cooling tower; responding to a fire signal, sending an instruction to an electromagnetic valve by a control box, and simultaneously heating, blasting and spraying water by a closed spray head, and opening a deluge valve; in response to the first pressure switch fire signal, the control box sends instructions to the electric valve, the first and second fire pumps, and the first and second pressure stabilizing pumps to cause the open sprinkler to spray water at a predetermined pressure. The system is independently arranged, is suitable for new construction and reconstruction projects, has high construction flexibility, small fire-fighting water tank volume and can recycle fire-fighting water.
Description
Technical Field
The invention relates to the technical field of cooling tower fireproof, in particular to an automatic water spraying fire extinguishing system and an automatic water spraying fire extinguishing method for a cooling tower.
Background
The mechanical ventilation cooling tower is a heat exchange device widely applied in civil and industrial fields. The cooling tower runs for a long time, and the motor runs overheated, and a fire disaster can occur. The cooling tower side plates are made of fiber reinforced composite FRP, the internal filler and the fan deck are made of polyvinyl chloride, and the sealing materials for sealing the assembly gaps of the cooling tower are inflammable materials, so that fire can be caused during maintenance. The fire of the cooling tower spreads rapidly, is difficult to extinguish in the first time, and can cause great threat to life and production safety.
The existing building design fireproof standard in China does not require a special, rapid and effective fire-fighting facility for the cooling tower. At present, no independent special automatic water spraying fire extinguishing system for the cooling tower exists. For high-grade civil buildings and important industrial enterprises, in order to avoid fire disasters of the cooling towers, spray heads are arranged in the cooling towers during project design, and branch pipes are led out from automatic water spraying fire extinguishing systems arranged at other positions to be connected to the spray heads in the cooling towers.
The existing automatic water spraying fire extinguishing system comprises the following components and working principles: a fire-fighting water tank and a fire-fighting pump are arranged in a low-level water pump room, a high-level fire-fighting water tank and a pressure stabilizing device are arranged between roof water tanks, and a spray head is arranged in a region required by fire-fighting regulations. A spray head is arranged in the roof cooling tower and is connected with an automatic water spraying fire extinguishing system. In the case of fire, the fire pump absorbs water from the fire water tank and ejects the water from the spray head.
The prior technical proposal has the following defects:
1. for newly-built projects, a branch pipe is led out from an automatic water spraying fire extinguishing system and connected to a cooling tower nozzle, but the position of the cooling tower is usually far or high from other areas where the nozzles are arranged, so that the length of a laid pipeline can be increased, and the lift of a fire pump can be increased; on the other hand, the open type spray head of the cooling tower has larger water spraying intensity than other areas, so that the flow rate of the fire pump can be increased, the water storage capacity of the fire pool can be increased, and the investment and operation and maintenance cost can be increased.
2. For the established projects, if the civil building or the factory has no automatic water spraying fire extinguishing system, because a fire-fighting water tank is newly arranged, a fire-fighting high-level water tank, a fire-fighting pressure stabilizing device and the like are newly arranged on the roof, the system setting requirement is hardly met due to the existing conditions on site, and the automatic water spraying fire extinguishing system of the newly arranged cooling tower is hardly realized.
3. For the established project, the spray head is newly arranged in the cooling tower, and the flow, the lift, the volume of a fire-fighting water tank and the like of the fire-fighting pump in the existing fire-fighting system cannot meet the fire-fighting requirement of the spray head of the cooling tower, so that the existing automatic water-spraying fire-extinguishing system cannot be utilized.
4. The spray nozzle in the cooling tower has higher water spray intensity, larger protection area, needs to be provided with a fire-fighting water pool with thousands of tons, and has large occupied area and high investment.
The above information disclosed in the background section is only for enhancement of understanding of the background of the invention and therefore may contain information that does not form the prior art that is already known to a person of ordinary skill in the art.
Disclosure of Invention
The invention aims to provide an automatic water spraying fire extinguishing system and an automatic water spraying fire extinguishing method for a cooling tower, which are suitable for new and reconstruction projects, high in construction flexibility, small in fire water tank volume, capable of recycling fire water, low in investment transformation and operation maintenance cost and independently arranged.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention relates to an automatic water spraying fire extinguishing system of a cooling tower, which comprises:
the cooling tower comprises a water collecting disc, wherein the water collecting disc is provided with a first water outlet pipeline connected with the power station and a fire water inlet port connected with a fire water inlet pipeline,
the interception device is arranged on the side wall of the fire water inlet,
an electric valve arranged on the first water outlet pipeline for switching on and off the first water outlet pipeline,
a check valve arranged on the fire-fighting water inlet pipeline,
first and second fire pumps provided in parallel on the fire water inlet pipe,
a first pressure switch arranged on the pipeline after the first and the second fire pump outlets are connected in parallel,
the deluge alarm valve bank is arranged on a pipeline after the first fire pump outlet and the second fire pump outlet are connected in parallel and comprises a first signal valve, a deluge valve and a second signal valve which are sequentially connected on a vertical pipeline; the lower connecting branch pipe of the deluge valve body is provided with an electromagnetic valve,
the branch pipe is connected with the rain alarm valve group and is connected with the cooling tower,
an open type spray head which is arranged in the cooling tower and is connected with the branch pipe,
a transmission pipe connected with the lower part of the deluge valve body and connected with the branch pipe and the cooling tower,
a closed spray head which is arranged in the cooling tower and is connected with the transmission pipe,
a fire detector provided in the cooling tower to generate a fire signal,
the bottom of the water tank is provided with a second water outlet pipeline connected with the fire-fighting water inlet pipeline,
a connecting pipe connected with the second water outlet pipeline and connected with the pipelines after the first and the second fire pump outlets are connected in parallel,
the pressure stabilizing device is arranged on the connecting pipe and comprises a first pressure stabilizing pump, a second pressure switch, a third pressure switch and an air pressure water tank which are sequentially arranged on the connecting pipe in parallel,
the control box is connected with the electric valve, the first fire pump, the second fire pump, the first signal valve, the second signal valve, the electromagnetic valve, the fire detector, the first pressure stabilizing pump, the second pressure stabilizing pump, the first pressure switch, the second pressure switch and the third pressure switch.
In the automatic water spraying fire extinguishing system of the cooling tower, a control box sends an instruction to an electromagnetic valve in response to a fire signal of a fire detector in the cooling tower, meanwhile, a closed spray head is heated, blasted and sprayed with water, a transmission pipe is decompressed, a deluge valve is opened, and the control box sends the instruction to an electric valve, a first fire pump and a second fire pump in response to a signal of a first pressure switch, so that the open spray head sprays water at a preset pressure.
In the automatic water spraying fire extinguishing system of the cooling tower, the interception device is detachable and is connected with the side wall of the water collecting disc of the cooling tower.
In the automatic water spraying fire extinguishing system of the cooling tower, the interception device comprises covers of inner and outer layers of grids, the distance between the outer layers of grids is larger than that between the inner layers of grids, and the two covers are arranged at intervals.
In the automatic water spraying fire extinguishing system of the cooling tower, the flow of the first and the second fire pumps are related to the water spraying intensity and the acting area of the open type spray head, and the lift of the first and the second fire pumps is related to the working pressure of the open type spray head at the most unfavorable point of the fire pumps and the head loss of a pipeline.
In the automatic water spraying fire extinguishing system of the cooling tower, the working pressure of the least disadvantageous point open type spray head is 0.1-0.3MPa.
In the automatic water spraying fire extinguishing system of the cooling tower, the water spraying intensity of the open type spray head is 10-30L/min.m2.
In the automatic water spraying fire extinguishing system of the cooling towers, the action area of the independent cooling towers is calculated according to the area of 1 cooling tower, and the areas of a plurality of cooling towers assembled and combined are calculated according to the area of at least 2 cooling towers.
In the automatic water spraying fire extinguishing system of the cooling tower, the continuous water spraying time is 0.5-3h.
In the automatic water spraying fire extinguishing system of the cooling tower, the working pressure of the closed spray head at the least adverse point is 0.1MPa.
In the automatic water spraying fire extinguishing system of the cooling tower, the water level of the water tank cannot be lower than that of the water collecting disc.
In the automatic water spraying fire extinguishing system of the cooling tower, the water tank stores fire-fighting water consumption for ensuring the normal operation of the system.
The fire extinguishing method based on the automatic water spraying fire extinguishing system of the cooling tower comprises the following steps of,
step S1: the fire disaster detector in the cooling tower detects the occurrence of fire disaster, the fire disaster signal is transmitted to the control box, the electromagnetic valve is opened by the signal, meanwhile, the closed spray head is heated, blasted and sprayed with water, the transmission pipe is decompressed,
step S2: the decompression cavity in the valve body of the deluge valve is decompressed, the deluge valve is opened,
step S3: the first pressure switch sends a signal to the control box,
step S4: responding to a fire signal, sending an instruction by the control box, closing the electric valve, the first pressure stabilizing pump and the second pressure stabilizing pump, and starting the first or the second fire pump; the first or the second fire pump absorbs water from the water tank and/or the water collecting tray of the cooling tower, is sprayed out from the open type spray head through the branch pipe, falls into the water collecting tray of the cooling tower,
step S5: after the fire is extinguished, the first or second fire pump is turned off remotely or in situ.
In the method, when the pressure in the water outlet pipeline of the steady pressure pump reaches a second preset pressure value, the second pressure switch sends a signal to the control box, the steady pressure pump is started by the signal so as to increase the pressure in the pipeline behind the steady pressure pump, and when the pressure reaches a third preset pressure value, the third pressure switch sends a signal to the control box, and the steady pressure pump is closed by the signal.
In the technical scheme, the automatic water spraying fire extinguishing system for the cooling tower has the following beneficial effects: the automatic water spraying fire extinguishing system of the cooling tower is independently arranged, other fire extinguishing systems are not needed to be utilized, and the problem that the investment and operation and maintenance cost of system equipment are increased in the existing newly-built project, and the cooling tower spray heads are unconditionally arranged in the built project is solved. The automatic water spraying fire extinguishing system of the cooling tower is suitable for new construction and reconstruction projects. For new projects, the system can reduce equipment investment and operation and maintenance cost. For a cooling tower that has been put into operation, only a small number of equipment and piping need be added. The invention uses a small amount of water in the water tank as a water source, can be recycled for fire extinguishment, and does not need to arrange a fire-fighting water tank of thousands of tons and be connected with an external water source for water supply. The system is started by adopting two modes of the fire detector and the closed spray head, and the reliability is greatly improved. The system has the advantages of simple structure, reliable operation, full-automatic operation, small occupied area, small investment and low operation cost.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings may be obtained according to these drawings for a person having ordinary skill in the art.
Fig. 1 is a schematic structural diagram of an automatic water spraying fire extinguishing system of a cooling tower according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, based on the embodiments of the invention, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the invention.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, based on the embodiments of the invention, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the invention.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
In order to make the technical scheme of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings.
Referring to fig. 1, in one embodiment, a cooling tower sprinkler system of the present invention includes,
a cooling tower 1, which comprises a water collecting disc 2, wherein the water collecting disc 2 is provided with a first water outlet pipeline 3 connected with a power station and a fire water inlet 6 connected with a fire water inlet pipeline 8,
an interception device 7 which is arranged on the side wall of the fire water inlet 6,
an electric valve 4 arranged on the first water outlet pipeline 3 to switch on and off the first water outlet pipeline 3,
a check valve 9 provided in the fire water inlet pipe 8,
first and second fire pumps 10 and 11, which are provided in parallel on the fire inlet pipe 8,
a first pressure switch 12 which is arranged on a pipeline after the outlets of the first fire pump 10 and the second fire pump 11 are connected in parallel,
the deluge alarm valve group 13 is arranged on a pipeline after the outlets of the first fire pump 10 and the second fire pump 11 are connected in parallel, and comprises a first signal valve 13-1, a deluge valve 13-2 and a second signal valve 13-3 which are sequentially connected on a vertical pipeline; the connecting branch pipe 13-4 at the lower part of the valve body of the deluge valve 13-2 is provided with an electromagnetic valve 13-5,
a branch pipe 14 connected with the shower alarm valve group 13 and connected with the cooling tower 1,
an open nozzle 15 provided in the cooling tower 1 and connected to the branch pipe 14,
a transmission pipe 16 connected with the lower valve body connecting branch pipe 13-4 of the deluge valve 13-2 and connected with the cooling tower 1,
a closed nozzle 17 which is arranged in the cooling tower 1 and is connected with the transmission pipe 16,
a fire detector 18 provided in the cooling tower 1 to generate a fire signal,
a water tank 19, the bottom of which is provided with a second water outlet pipeline 20 connected with the fire-fighting water inlet pipeline 8,
a connection pipe 21 connected to the second water outlet pipe 20 and connected to the pipes connected in parallel to the outlets of the first and second fire pumps 10 and 11,
a pressure stabilizing device 22, which is arranged on the connecting pipe 21 and comprises a first pressure stabilizing pump 22-1 and a second pressure stabilizing pump 22-2, a second pressure switch 22-3, a third pressure switch 22-4 and a pneumatic water tank 22-5 which are sequentially arranged on the connecting pipe 21 in parallel,
a control box 5 connected with the electric valve 4, the first and second fire pumps 10 and 11, the first signal valve 13-1, the second signal valve 13-3, the electromagnetic valve 13-5, the fire detector 18, the first and second pressure stabilizing pumps 22-1 and 22-2, the first pressure switch 12, the second pressure switch 22-3, and the third pressure switch 22-4.
In response to a fire signal of a fire detector 18 in the cooling tower 1, the control box 5 sends a command to the electromagnetic valve 13-5, and meanwhile, the closed spray head 17 is heated, blasted and sprayed with water, and the transmission pipe 16 is decompressed; after the deluge valve 13-2 is opened (both modes can open the deluge valve 13-2), the control box 5 sends a command to the electric valve 4, the first and second fire pumps 10 and 11 in response to the signal of the first pressure switch 12, causing the open sprinkler 15 to spray water at a predetermined pressure.
In one embodiment, an electric valve 4 is arranged on the first water outlet pipeline 3 at the bottom of the water collecting disc 2 of the cooling tower 1. The control box 5 can open and close the electric valve 4. The control box 5 is connected to a fire-fighting duty room through a control line, and a fire-fighting duty person can remotely control the automatic water-spraying fire-extinguishing system of the cooling tower. The first outlet conduit 3 of the cooling tower 1 is connected to the power station. The side wall of the bottom of the water collecting disc 2 of the cooling tower 1 is provided with a fire water inlet 6, and the fire water inlet 6 is provided with an interception device 7. The interception device 7 is a cover with an inner layer of grids and an outer layer of grids, the outer layer of grids are larger in distance, larger sundries such as branches can be intercepted, the inner layer of grids are smaller in distance, smaller sundries such as leaves can be intercepted, and a certain distance is reserved between the two layers of covers. The upper end of the interception device 7 can be hung on the side wall of the water collecting disc 2, and is convenient to take down for cleaning. The fire water inlet 6 is connected with a fire water inlet pipeline 8, and a check valve 9 is arranged on the fire water inlet pipeline 8 near the cooling tower 1. First and second fire pumps 10 and 11 are provided on the connection pipe of the check valve 9. The first and second fire pumps 10 and 11 are connected in parallel, one with the other. The flow rates of the first and second fire pumps 10 and 11 are calculated from the spray intensity and the acting area of the sprinkler head, and the head is calculated from the operating pressure of the most disadvantageous point open sprinkler head 15 and the head loss of the pipe. The first and second fire pumps 10 and 11 may employ electric pumps or diesel pumps. The control box 5 and the fire-fighting attendant can control the on and off of the first and second fire pumps 10 and 11. A first pressure switch 12 is provided on the pipeline after the outlets of the first and second fire pumps 10 and 11 are connected in parallel. The first pressure switch 12 transmits a signal to the control box 5, which can turn on the first fire pump 10 and the second fire pump 11, and transmits a warning signal to the fire-fighting attendant. The vertical pipeline connected with the first pressure switch 12 is provided with a rain alarm valve group 13, which is specifically set as follows: the pipeline is sequentially provided with a first signal valve 13-1, a deluge valve 13-2 and a second signal valve 13-3. The first signal valve 13-1 and the second signal valve 13-3 are normally open. The first signal valve 13-1 and the second signal valve 13-3 are used for transmitting signals to a fire-fighting duty room, and staff in the duty room can see the opening or closing state of the signal valves to prevent the signal valves from being closed by mistake. And a branch pipe 13-4 is connected from one side of the lower part of the valve body of the deluge valve 13-2, and the branch pipe 13-4 is connected above the drain funnel. An electromagnetic valve 13-5 is provided on the branch pipe 13-4. The control box 5 can control the opening and closing of the solenoid valve 13-5. A transmission pipe 16 is arranged on a branch pipe 13-4 which is connected with the shower valve 13-2 and the electromagnetic valve 13-5, and the transmission pipe 16 enters the cooling tower 1 from a side plate at the upper part of the cooling tower. A closed sprinkler 17 is arranged on the tower inner drive pipe 16. The nominal operating temperature of the closed sprinkler 17 is 30 c higher than the maximum ambient temperature. When a fire disaster occurs, the closed spray head 17 is heated and blasts to spray water, the transmission pipe 16 is decompressed, the pressure in the branch pipe 13-4 is reduced, the decompression cavity of the deluge valve 13-2 is decompressed, and the deluge valve 13-2 is opened. Branch pipes 14 connected with the rain alarm valve group 13 enter the cooling tower from a side plate at the upper part of the cooling tower 1, and open type spray heads 15 are arranged on the branch pipes 14. The open sprinkler 15 provides spray protection for the packing, fan motor and fan deck. A fire detector 18 is arranged above the cooling tower 1 packing and the motor. The fire detector 18 is typically a linear temperature sensitive fire detector. When a fire occurs, the signal of the fire detector 18 is transmitted to the control box 5, the signal opens the electromagnetic valve 13-5, and an alarm signal is sent to the fire-fighting duty room. After the electromagnetic valve 13-5 is opened, the deluge valve 13-2 is opened.
A water tank 19 is arranged on one side of the cooling tower 1, and a bracket is arranged below the water tank 19. The water level of the water tank 19 cannot be lower than the water level of the water collecting tray 2 so as to prevent water in the water collecting tray 2 from overflowing from the water tank 19. The water tank 19 stores water in an amount that ensures proper operation of the fire protection system when no water is present in the fire water collection tray 2 and the cooling tower packing. A second water outlet pipeline 20 is arranged at the bottom of the water tank 19, and the second water outlet pipeline 20 is connected with the fire-fighting water inlet pipeline 8. And a connection pipe 21 connected to the second water outlet pipe 20 and connected to the pipes connected in parallel to the outlets of the first and second fire pumps 10 and 11. The pressure stabilizing device 22 is provided on the connection pipe 21, and is specifically provided as follows: the first and second pressure stabilizing pumps 22-1 and 22-2, the second pressure switch 22-3, the third pressure switch 22-4 and the air pressure water tank 22-5 which are connected in parallel are sequentially arranged on the connecting pipe 21,
the first and second pressure stabilizing pumps 22-1 and 22-2 are operated alternately by one and by one, and are automatically switched to operate alternately. The design flow of the stabilized pump is not smaller than the normal leakage flow of the system and the automatic starting flow of the system, and the design pressure meets the requirement of the working pressure of the closed spray head 17 at the most unfavorable point. The control box 5 can turn on and off the first and second pressure stabilizing pumps 22-1 and 22-2 according to the values set by the second pressure switch 22-3 and the third pressure switch 22-4. The pneumatic water tank 22-5 is a diaphragm type, and functions to prevent the first and second pressure stabilizing pumps 22-1 and 22-2 from being frequently started. The first and second pressure stabilizing pumps 22-1 and 22-2 can maintain a stable pressure in the branch pipe 13-4 from the water pump outlet to the lower part of the valve body of the deluge valve 13-2 and the transmission pipe 16.
The working pressure of the spray head with the least adverse point opening is 0.1-0.3MPa, and the water spray intensity is 10-30L/min.m2. The planar arrangement of the spray heads should ensure the required spray intensity per unit area in the fire extinguishing area and should ensure that fire fighting water of a certain intensity is sprayed evenly over the whole protected area. For individual cooling towers, the active area is calculated as the area of 1 cooling tower, and for a plurality of cooling towers assembled, the fire often ignites adjacent other cooling towers due to the combustion of one tower, and the active area is calculated as the area of at least 2 cooling towers. The continuous water spraying time of the automatic water spraying fire extinguishing system of the cooling tower is 0.5-3h.
The working pressure of the closed spray head at the most unfavorable point is 0.1MPa.
In one embodiment, the electrically operated valve 4 on the first outlet conduit 3 is opened when the cooling tower 1 is in operation. Hot water enters from a water inlet pipeline of the cooling tower 1, and flows out to the power station from a first water outlet pipeline 3 after heat exchange.
The air pressure water tank 22-5 is internally provided with a certain amount of water, and the operation conditions of the first pressure stabilizing pump 22-1 and the second pressure stabilizing pump 22-2 are controlled by using the operation pressure set by the air pressure water tank 22-5 so as to achieve the functions of pressure boosting and pressure stabilizing. When leakage or the like occurs in the pipeline system at ordinary times, the pressure in the pipeline is reduced, when the pressure set by the second pressure switch 22-3 is reached, the second pressure switch 22-3 sends a signal to the control box 5, the signal starts the first or second pressure stabilizing pump 22-1 or 22-2 to start water supplementing and stabilizing, and when the pressure set by the third pressure switch 22-4 is reached, the signal closes the first or second pressure stabilizing pump 22-1 or 22-2. The first or second pressure stabilizing pump 22-1 or 22-2 repeatedly starts operation.
When the cooling tower 1 is overhauled, the electric valve 4 of the water inlet pipeline valve and the first water outlet pipeline 3 of the cooling tower 1 is closed. Because of maintenance, water may not exist in the water collecting tray 2, a check valve 9 is arranged on the fire-fighting water inlet pipeline 8, and water in the water tank 19 cannot enter the water collecting tray 2.
The deluge valve 13-2 is normally closed. When the fire detector 18 detects the fire in the cooling tower 1, a signal is transmitted to the control box 5, the electromagnetic valve 13-5 is opened by the signal, water is discharged to the drainage funnel under the pressure effect, meanwhile, the closed spray head 17 is heated, blasts and sprays water, the transmission pipe 16 is decompressed, the pressure in the branch pipe 13-4 is reduced, the decompression cavity in the valve body of the deluge valve 13-2 is decompressed, and the deluge valve 13-2 is opened. The pressure in the pipeline at the outlet of the first or second fire pump 10 or 11 drops rapidly, and when the pressure drops to the value set by the first pressure switch 12, a signal is sent to the control box 5, the signal turns off the first or second pressure stabilizing pump 22-1 or 22-2, and the first or second fire pump 10 or 11 is started.
The first or the second fire pump 10 or 11 absorbs water from the water tank 19 and/or the water collecting disc 2 of the cooling tower 1, pressurized water is sprayed out from the open type spray head 15 through the rain alarm valve group 13 to extinguish fire, and the water falls into the water collecting disc 2 of the cooling tower. The fire water is recycled in the system without an external supplemental water source.
After the fire is extinguished, the fire attendant remotely or in situ shuts down the first or second fire pump 10 or 11.
The fire extinguishing method based on the automatic water spraying fire extinguishing system of the cooling tower comprises the following steps:
step S1: the fire detector 18 in the cooling tower 1 detects the occurrence of fire, the fire signal is transmitted to the control box 5, the electromagnetic valve 13-5 is opened by the signal, meanwhile, the closed spray head 17 is heated, blasted and sprayed with water, the driving tube 16 is decompressed,
step S2: the decompression cavity of the valve body of the deluge valve 13-2 is decompressed, the deluge valve 13-2 is opened,
step S3: the first pressure switch 12 sends a signal to the control box 5,
step S4: responding to a fire signal, sending an instruction by the control box, closing the electric valve, the first pressure stabilizing pump and the second pressure stabilizing pump, and starting the first or the second fire pump; the first or the second fire pump absorbs water from the water tank and/or the water collecting tray of the cooling tower, is sprayed out from the open type spray head through the branch pipe, falls into the water collecting tray of the cooling tower,
step S5: after the fire is extinguished, the first or second fire pump 10 or 11 is turned off remotely or in situ.
In one embodiment, the second pressure switch sends a signal to the control box when the pressure in the regulated pump outlet line reaches a second predetermined pressure value, the signal activates the regulated pump to increase the pressure in the conduit after the regulated pump, and the third pressure switch sends a signal to the control box when the pressure reaches a third predetermined pressure value, the signal turns off the regulated pump. The design flow of the stabilized pump is not smaller than the normal leakage flow of the system and the automatic starting flow of the system, and the design pressure meets the requirement of the working pressure of the closed spray head at the most unfavorable point.
Finally, it should be noted that: the described embodiments are intended to be illustrative of only some, but not all, of the embodiments disclosed herein and, based on the embodiments disclosed herein, all other embodiments that may be made by those skilled in the art without the benefit of the teachings herein are intended to be within the scope of this application.
While certain exemplary embodiments of the present invention have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that modifications may be made to the described embodiments in various different ways without departing from the spirit and scope of the invention. Accordingly, the drawings and description are to be regarded as illustrative in nature and not as restrictive of the scope of the invention, which is defined by the appended claims.
Claims (9)
1. An automatic sprinkler system for a cooling tower, comprising:
the cooling tower comprises a water collecting disc, wherein the water collecting disc is provided with a first water outlet pipeline connected with the power station and a fire water inlet port connected with a fire water inlet pipeline,
the interception device is arranged on the side wall of the fire water inlet,
an electric valve arranged on the first water outlet pipeline for switching on and off the first water outlet pipeline,
a check valve arranged on the fire-fighting water inlet pipeline,
first and second fire pumps provided in parallel on the fire water inlet pipe,
a first pressure switch arranged on the pipeline after the first and the second fire pump outlets are connected in parallel,
the deluge alarm valve bank is arranged on a pipeline after the first fire pump outlet and the second fire pump outlet are connected in parallel and comprises a first signal valve, a deluge valve and a second signal valve which are sequentially connected on a vertical pipeline; the connecting branch pipe at the lower part of the valve body of the deluge valve is provided with an electromagnetic valve,
the branch pipe is connected with the rain alarm valve group and is connected with the cooling tower,
an open type spray head which is arranged in the cooling tower and is connected with the branch pipe,
a transmission pipe connected with the lower part of the deluge valve body and connected with the branch pipe and the cooling tower,
a closed spray head which is arranged in the cooling tower and is connected with the transmission pipe,
a fire detector provided in the cooling tower to generate a fire signal,
the bottom of the water tank is provided with a second water outlet pipeline connected with the fire-fighting water inlet pipeline,
a connecting pipe connected with the second water outlet pipeline and connected with the pipelines after the first and the second fire pump outlets are connected in parallel,
the pressure stabilizing device is arranged on the connecting pipe and comprises a first pressure stabilizing pump, a second pressure switch, a third pressure switch and an air pressure water tank which are sequentially arranged on the connecting pipe in parallel,
the control box is connected with the electric valve, the first fire pump, the second fire pump, the first signal valve, the second signal valve, the electromagnetic valve, the fire detector, the first pressure stabilizing pump, the second pressure stabilizing pump, the first pressure switch, the second pressure switch and the third pressure switch, responds to a fire signal of the fire detector in the cooling tower, the control box sends an instruction to the electromagnetic valve, meanwhile, the closed type spray head is heated and blasted for spraying water, the transmission pipe is decompressed, the deluge valve is opened, responds to a signal of the first pressure switch, the control box sends an instruction to the electric valve, the first fire pump and the second fire pump, the open type spray head sprays water with preset pressure, the interception device comprises covers of inner and outer two layers of grids, the outer layer grid spacing is larger than the inner layer grid spacing, the two covers are arranged at intervals, the interception device is detachably connected with the side wall of the water collecting disc of the cooling tower, a bracket is arranged below the water tank, and the water level of the water tank cannot be lower than the water level of the water collecting disc.
2. A cooling tower automatic sprinkler system according to claim 1, wherein,
the flow rates of the first and the second fire pumps are related to the water spray intensity and the acting area of the open type spray head, and the lift of the first and the second fire pumps is related to the working pressure of the open type spray head at the most unfavorable point and the head loss of a pipeline.
3. A cooling tower automatic sprinkler system according to claim 2, wherein,
the working pressure of the least disadvantageous point open type spray head is 0.1-0.3MPa.
4. A cooling tower automatic sprinkler system according to claim 1, wherein,
the water spray intensity of the open type spray head is 10-30L/(min.m) 2 )。
5. A cooling tower automatic sprinkler system according to claim 1, wherein,
the working pressure of the closed spray head with the least adverse point is 0.1MPa.
6. A cooling tower automatic sprinkler system according to claim 1, wherein,
the continuous water spraying time of the fire extinguishing system is 0.5-3h.
7. A cooling tower automatic sprinkler system according to claim 1, wherein,
the water tank stores fire water consumption for ensuring the normal operation of the system.
8. A fire extinguishing method based on a cooling tower automatic sprinkler system according to any one of claims 1-7, characterized in that it comprises the steps of,
step S1: the fire disaster detector in the cooling tower detects the occurrence of fire disaster, the fire disaster signal is transmitted to the control box, the electromagnetic valve is opened by the signal, meanwhile, the closed spray head is heated, blasted and sprayed with water, the transmission pipe is decompressed,
step S2: the decompression cavity of the valve body of the deluge valve is decompressed, the deluge valve is opened,
step S3: the first pressure switch sends a signal to the control box,
step S4: responding to a fire signal, sending an instruction by the control box, closing the electric valve, the first pressure stabilizing pump and the second pressure stabilizing pump, and starting the first or the second fire pump; the first or the second fire pump absorbs water from the water tank and/or the water collecting tray of the cooling tower, is sprayed out from the open type spray head through the branch pipe, falls into the water collecting tray of the cooling tower,
step S5: after the fire is extinguished, the first or second fire pump is turned off remotely or in situ.
9. The fire suppression method of claim 8, wherein the second pressure switch sends a signal to the control box to activate the booster pump to increase the pressure in the conduit after the booster pump when the pressure in the booster pump outlet reaches a second predetermined pressure value, and wherein the third pressure switch sends a signal to the control box to deactivate the booster pump when the pressure reaches a third predetermined pressure value.
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| KR102514391B1 (en) * | 2022-06-08 | 2023-03-27 | 박창현 | Fuel cell integrated cooling tower system with firefighting function |
| CN116370873B (en) * | 2023-06-01 | 2023-09-12 | 常州华立阀门控制设备有限公司 | Intelligent electric valve actuator with controllable flow |
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| GB180846A (en) * | 1921-04-14 | 1922-06-08 | William Hughes | Improvements in fire extinguishing and fumigating plants |
| CN203315621U (en) * | 2013-05-15 | 2013-12-04 | 大唐三门峡发电有限责任公司 | Firefighting system |
| CN204034114U (en) * | 2014-06-24 | 2014-12-24 | 福建省晋江市长成发新树脂有限公司 | The pipe-line system that novel cooling fire-fighting combines |
| CN205935060U (en) * | 2016-08-15 | 2017-02-08 | 邓秋萍 | Fire control voltage regulator device |
| CN210873866U (en) * | 2019-10-09 | 2020-06-30 | 宁波正源电力有限公司 | Fire water system combined with generator set cooling tower |
| CN211974513U (en) * | 2020-01-03 | 2020-11-20 | 上海同泰火安科技有限公司 | Foam spraying container pump room |
| CN113390137A (en) * | 2020-03-11 | 2021-09-14 | 上海申能新动力储能研发有限公司 | Air-conditioning fire-fighting system |
| CN212673885U (en) * | 2020-06-18 | 2021-03-09 | 酷仑冷却技术（上海）有限公司 | Cooling tower with fire-fighting spraying equipment |
| CN214743410U (en) * | 2021-04-13 | 2021-11-16 | 狮可立消防装备技术(深圳)有限公司 | Fusing deluge valve |
| CN215309833U (en) * | 2021-06-22 | 2021-12-28 | 张祎达 | Novel pneumatic fire control in oil field drenches equipment |
| CN216925208U (en) * | 2022-01-11 | 2022-07-08 | 世源科技工程有限公司 | Automatic water spraying fire extinguishing system of cooling tower |
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