CN210057236U - Automatic nitrogen fire prevention and extinguishing system - Google Patents
Automatic nitrogen fire prevention and extinguishing system Download PDFInfo
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- CN210057236U CN210057236U CN201920501824.5U CN201920501824U CN210057236U CN 210057236 U CN210057236 U CN 210057236U CN 201920501824 U CN201920501824 U CN 201920501824U CN 210057236 U CN210057236 U CN 210057236U
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Abstract
The utility model discloses an automatic fire prevention fire extinguishing systems of nitrogen gas, include: the device comprises a nitrogen supply device, a nitrogen supply pipeline, a ventilation pipeline and a nitrogen injection nozzle, wherein one end of the nitrogen supply pipeline is connected with a nitrogen outlet of a gas separation unit of the nitrogen supply device, and the other end of the nitrogen supply pipeline is connected with the nitrogen injection nozzle arranged in a protection area; the ventilation pipeline is used for balancing air pressure of the protection area, one end of the ventilation pipeline is connected with an air inlet of the air compressor unit of the nitrogen supply device, and the other end of the ventilation pipeline is connected with one end of the ventilation pipeline. The system can prevent fire and extinguish fire, and not only solves the problems that the existing fire protection system is not approved by the existing fire protection mandatory standard and cannot be popularized and applied; meanwhile, the defects that the traditional gas fire extinguishing system has low fire extinguishing success rate and can not extinguish solid deep fire are avoided; in addition, the system can cancel a pressure relief opening which is required to be arranged in the traditional gas fire extinguishing system, thereby solving the contradiction between the enclosure opening of the protective area, the constant temperature and humidity air conditioner arranged in the protective area and the safety and the theft prevention of the protective area.
Description
Technical Field
The invention relates to the field of gas fire fighting of buildings, and has the advantages of advanced design concept, environmental protection, safety to human bodies, high fire extinguishing success rate, capability of extinguishing solid deep fire, small fire loss, space theft prevention, low air conditioning electricity charge and capability of increasing the storage time of protected objects. The device can be used for protecting places for storing valuables such as metal, paper and silk products, audio and video products, artworks, specimens, books, bills, magnetic cards, data media and the like, and can also be used for protecting special places such as dangerous goods, chemicals, military fire, nuclear bombs, electronic components and parts, exploitation and storage of fuels, power distribution rooms, cable interlayers and the like. The fireproof door is used for preventing fire in a protective area in advance, and preventing and avoiding fire and fire damage; in case can be used to the fire extinguishing of guard area to put out a fire and put out a fire after catching fire, concretely relates to automatic fire prevention fire extinguishing system of nitrogen gas.
Background
The places for storing cultural relics, files or valuables such as metal, paper silk products, audio-video products, artworks, specimens, books, bills, magnetic cards, data media and the like belong to the occasions with huge loss after ignition, and a plurality of valuables in the places need to be stored in a constant temperature-constant humidity-low oxygen environment; because the water stain loss is large after the places are put out fire by using water, the places are protected by adopting a gas fire extinguishing system according to the existing building design fire protection code.
The application of the heptafluoropropane, IG541, IG100, aerosol, trifluoromethane, carbon dioxide and other gas fire extinguishing systems is very common under the support of the existing building design fire protection code, and a plurality of manufacturers are available; the fire extinguishing mechanism is to extinguish fire by isolating oxygen and reducing temperature; the fire extinguishing agent is suitable for extinguishing surface fire, liquid fire and electric fire of solid matters and gas fire capable of cutting off a gas source before fire extinguishment; is suitable for various closed places; no person is needed to be present during gas spraying, no residual pollutants and water stains are left after the gas is sprayed, an independent exhaust system is needed, and an exhaust outlet is directly communicated with the outside; when the gas is sprayed, the door and the window and the ventilation system need to be closed in a linkage manner, and the spraying is delayed after the acousto-optic alarm is given; according to the regulations of the existing design specifications of gas fire extinguishing systems, each protection area must be forcibly provided with a pressure relief opening (which is not beneficial to the arrangement and the theft prevention of a constant-temperature constant-humidity air conditioner); fire extinguishing agentThe storage capacity is calculated according to the design usage of one protection area with the largest volume; the fire extinguishing gas is usually sprayed and used once (no standby, low safety factor is low) in a high-pressure bottle group (low-pressure gas is canned) storage mode, and the concentration of the fire extinguishing gas in a protected space cannot be maintained for a long time (fire extinguishing dipping time is short), so that the fire extinguishing gas cannot be used for reburning solid deep fire; the system can be a unit independent system or a combined distribution system, one set of bottle groups allows to protect 8 protection zones, and the volume of the maximum protection zone is not more than 3600m3(ii) a The service life of the steel cylinder is 30 years, and the cylinder group needs to occupy the room area; except for a low-pressure carbon dioxide system, a high-pressure system is mostly adopted in the gas fire extinguishing system; three starting modes of automatic, manual and mechanical emergency operation are adopted; the method is suitable for GB50370-2005 design Specification of gas fire extinguishing systems, GB50193-93 design Specification of carbon dioxide fire extinguishing systems (2010 edition), DB43/T481-2009 design Specification of nitrogen (IG100) fire extinguishing systems and the like.
In order to reduce the storage volume of the fire extinguishing agent, a high-pressure system is adopted (the air leakage link is more), the initial investment of the system is low, the subsequent cost (weighing, detecting, inflating, replacing a steel cylinder and the like) in the service life is high, and the annual average cost is about 5-10% of the initial investment.
The reliability of gas fire extinguishing is limited by whether the airtightness of a protected area is good, whether the total amount of stored fire extinguishing agent is lower than the designed amount and whether a control system fails, and the above adverse factors influencing the success rate of fire extinguishing become more prominent along with the increase of the service life of a building; according to statistics, the success rate of fire extinguishing of various domestic gas fire extinguishing systems is about 50 percent; according to the statistics of the United states, the success rate of gas fire extinguishing is only 47%.
In an IG100 fire extinguishing system in a gas fire extinguishing system, the fire extinguishing agent is a gaseous stored inert gas-nitrogen (N2), and after being sprayed, the fire extinguishing agent has no influence on human bodies and protected objects, and the influence coefficient on the ozone layer and the influence on the greenhouse effect are both 0; the spraying time is less than 60S when the system is in fire extinguishing action; extinguishing dipping time of solid surface fire is 10 min; a minimum fire design concentration of 36% for a solid surface fire (corresponding to an oxygen concentration of 12.5% to achieve a smothering fire); the pressure of the bottle group is 15-20 MPa, and the working pressure of the spray head is more than 2 MPa; the fire extinguishing agent conveying distance is 150 m; the temperature of the fire extinguishing environment is 0-50 ℃; the maximum guard zone volume is not larger than 4500m 3; maximum fire extinguishing concentration at the highest ambient temperature of the protected area: a frequently occupied place 43%, and a frequently unoccupied place 52% (corresponding oxygen concentrations capable of realizing suffocation fire extinguishing are 12% and 10.1%, respectively); the fire extinguishing agent is stored in a gaseous state; the specific gravity of the nitrogen is 0.97, which is close to that of air, after being released, the fire extinguishing agent is not easy to float and overflow, and the fire extinguishing agent can be uniformly retained for a long time to prevent reburning; the fire extinguishing system consists of a storage bottle, a starting bottle, a collecting pipe, an air supply pipe, a pneumatic pipeline, a selector valve, a pressure reducing orifice plate, a pressure switch, a starting valve, a spray head, a fire extinguishing control panel, a fire detecting system, a blow-off indicator lamp, an audible and visual alarm and the like.
As the only fire protection system which is put into use in China, the nitrogen-injection oxygen-control fire protection system has few application examples because the nitrogen-injection oxygen-control fire protection system is not approved by the building design fire protection standard. At present, only 2 manufacturers exist in China; the fire prevention mechanism is that nitrogen is injected into the protection area, and the oxygen concentration is controlled to be always maintained at the level that combustible materials cannot be combusted; oxygen concentration control range: 14-16% of short-time personnel staying places and 12.5-13.5% of unmanned staying places; the protection area is provided with an alarm for over-high and over-low oxygen concentration; the device is suitable for space closed places; the success rate of the system fire extinguishing is equivalent to 100%; personnel can stay for a short time, and no residual pollutants or water stains are left on the site; the requirement on the air tightness of a protection space is met; because the nitrogen supply pressure is low (0.4 +/-0.1 MPa), an independent exhaust system and a pressure relief opening are not needed to be arranged according to technical regulations of a nitrogen injection and oxygen control fire protection system; the nitrogen is prepared on site, and the distance between the nitrogen supply device and the protection area is not more than 50 m; the nitrogen supply device adopts an air separation technology (a membrane separation method or a molecular sieve method) to prepare nitrogen; one set of nitrogen supply device (not requiring standby) allows 8000m of maximum protection space total volume3(ii) a Determining the nitrogen gas supply amount and the specification of a nitrogen supply device according to the maximum protection volume; the service life of the host equipment is 25 years, and the equipment can not occupy the room area; the ambient temperature of an air compressor unit installation place is-15-40 ℃; applicable recommendation criteria CECS 292: 2011 "gas fire facility model selection configuration design rules" and CECS189:2005 nitrogen injection and oxygen controlTechnical code for fire protection systems "; the initial investment is low, and the subsequent cost of the service life is the electricity cost of a nitrogen supply device (which is far lower than that of a gas fire extinguishing system); the fire protection system comprises a nitrogen supply device (an air compressor unit and a gas separator), an oxygen concentration detector, a control assembly (a main controller and an emergency alarm controller), an electric valve, a nitrogen supply pipeline and the like.
From the advancement of fire protection systems: first, fire prevention and extinguishment are two completely different concepts of fire protection; the known fire extinguishing system passively extinguishes fire after the fire happens, and emphasizes the fire extinguishing concept, so that fire scene loss is necessarily caused on the premise of extinguishing the fire, and meanwhile, water stain loss and pollution loss occur; the fire protection system actively injects inert gas-nitrogen into the protection space at ordinary times, so as to inhibit oxygen concentration, prevent combustion and achieve the purpose of active fire protection, and emphasizes the concept of fire protection; in terms of time sequence, if the fire can be effectively prevented from happening and the cause of the fire is restrained, the fire is naturally not needed to be extinguished; therefore, from the advancement of the system, the fire protection system can prevent the fire from happening in advance, prevent the damage of the fire to the protected object and reduce the fire loss to zero; clearly more advanced than fire suppression systems.
From the protection of cultural relics, files and other valuables, the nitrogen-injecting oxygen-controlling fire protection system can also protect the cultural relics, the files and the like of the Tibetan products and slow down the oxidation speed of the cultural relics and the files, so that the nitrogen-injecting oxygen-controlling fire protection system is a fire protection system and an anti-oxidation protection system; meanwhile, the fire protection system does not need to be provided with a pressure relief opening, so that the potential safety hazard is eliminated. In addition, when the cultural relic storeroom, the archive office and the like have constant temperature and humidity requirements on the air-conditioning system, the electric charge of the fire-protection system without the pressure relief opening is reduced greatly compared with the air-conditioning system with the pressure relief opening.
Aiming at special application places such as cultural relics and files with huge loss after ignition, the fire extinguishing success rate is improved, the fire loss is reduced, meanwhile, the space is required to be closed and anti-theft in function, the low-oxygen environment is required to prevent fire and slow down the oxidation speed, and meanwhile, a part of rooms are also required to be constant-temperature and constant-humidity air conditioners; if the fire extinguishing system is only available at present according to the regulation of the existing main fire standard, namely the building design fire protection standard, the performance of the system can not meet the multiple design requirements; on the contrary, the fire protection system that can meet the above requirements is not approved by the mother standard; the view of some experts is: it is difficult to meet the fire extinguishing demand, how once a fire is on?
For space enclosed places for storing valuables such as a storeroom and a file room, the market is expected to have a fireproof and fire-extinguishing system with both fireproof and fire-extinguishing functions in the future. The protected space is in a fireproof state for maintaining the low-oxygen environment to operate at ordinary times; once on fire, the system can automatically and rapidly fill non-oxygen gas (such as inert gas such as nitrogen, hydrofluorocarbon gas or CO2 gas), and the system is converted into a fire extinguishing state by rapidly reducing the oxygen content of the protected space to the minimum oxygen concentration of combustible combustion; because the oxygen concentration of a protected space provided with the fire protection system is very low (14-16%) at ordinary times, and the difference between the oxygen concentration required to be achieved during fire extinguishing (the oxygen concentration corresponding to the solid fire extinguishing design concentration is 10-12.5%) is not much, the instantaneous gas increment of quick inflation during fire extinguishing is far lower than that of a traditional gas fire extinguishing system (taking an IG100 fire extinguishing system as an example, the oxygen concentration in air is required to be reduced to 10-12.5% during fire extinguishing, and more nitrogen gas is required to be sprayed out instantly); if the fire extinguishing air source adopts the low-pressure nitrogen supply device used by the fire protection system, the instantaneous air pressure increment of the protected space is obviously lower than that of the traditional gas fire extinguishing system, and the possibility is provided for eliminating a pressure relief opening, solving the problems of constant temperature and humidity air conditioning and theft prevention of a protection area.
Disclosure of Invention
The invention aims to provide a nitrogen automatic fire-preventing and fire-extinguishing system which is used for protecting and storing cultural relics, files or valuables such as metal, paper and silk products, audio and video products, artworks, specimens, books, bills, magnetic cards, data media and the like, and is provided with a relatively closed space and no place where people or personnel stay for a short time; the system takes nitrogen prepared on site as a fire-fighting medium, and on the basis of the existing nitrogen-injection oxygen-control fire-fighting system, the system has the function of fire extinguishing after a fire disaster occurs by adding control elements, changing a control system and a control principle, adding a nitrogen supply device (which is used as standby equipment for fire prevention and nitrogen supply at ordinary times and is simultaneously put into use as fire extinguishing equipment during fire extinguishing), changing a pipe network and a nozzle design flow calculation method and the like, so that the requirement of the existing fire-fighting standard on the fire extinguishing function can be met.
In order to achieve the object of the present invention, the present invention provides an automatic nitrogen fire prevention and extinguishing system, comprising: the device comprises a nitrogen supply device, a nitrogen supply pipeline, a ventilation pipeline and a nitrogen injection nozzle, wherein one end of the nitrogen supply pipeline is connected with a nitrogen outlet of a gas separation unit of the nitrogen supply device, and the other end of the nitrogen supply pipeline is connected with the nitrogen injection nozzle arranged in a protection area; the ventilation pipeline is used for balancing air pressure of the protection area, one end of the ventilation pipeline is connected with an air inlet of the air compressor unit of the nitrogen supply device, and the other end of the ventilation pipeline is connected with one end of the ventilation pipeline.
Wherein the content of the first and second substances,
the nitrogen supply device is used for preparing nitrogen from air by adopting an air separation technology; the nitrogen supply concentration is not lower than 95 percent, and the nitrogen supply pressure is 0.4 +/-0.1 MPa; an air compressor unit in the nitrogen supply device is arranged outside the protection area and is less than 50m away from the protection area; the gas separation unit is combined with the air compressor or arranged in the protection area; the oxygen discharged by the gas separation unit is directly discharged, or is introduced into a room with people nearby for supplementing oxygen or operating an oxygen bar.
Wherein, the nitrogen supply pipelines in the protection area adopt a symmetrical arrangement mode and adopt a tee pipe fitting for shunting.
Wherein, still include: the fire extinguishing control panel, and a remote monitoring alarm, an oxygen concentration detector, a smoke detector, a temperature-sensitive detector, an audible and visual alarm, an alarm bell and an electric valve which are connected with the fire extinguishing control panel.
And when the number of the protection zones is more than 1, the nitrogen supply pipeline and the ventilation pipeline in each protection zone are provided with electric valves.
The fire extinguishing control panel is arranged outside the protection area in a centralized mode or in an on-duty room or a fire control room.
The remote monitoring alarm is arranged in a fire control room and used for receiving fire information, fire prevention and extinguishing actions, manual and automatic conversion and system equipment faults of each protection area, and remote control can be carried out.
The oxygen concentration detector is used for detecting the oxygen concentration of the protection area and outputting an oxygen concentration signal to the fire-fighting control panel; every protection zone sets up 2 oxygen concentration detector, and its setting position in the flame retardant zone should be apart from annotating nitrogen shower nozzle and be not less than 2m, and the mounting height is apart from ground 1.5 ~ 1.6 m.
The method comprises the following steps that 1-2 photoelectric smoke detectors are arranged on a suspended ceiling or a ceiling in each protection area, the installation height is not more than 12m, shielding objects are not required within 0.5m of the periphery of the suspended ceiling or the ceiling, the horizontal distance from the wall side to the beam side is not less than 0.5m, and the horizontal distance from the wall side to the air supply outlet of the air conditioner is not less than 1.5 m; and 1-2 temperature-sensitive detectors are arranged on the suspended ceiling or the ceiling in each protection area, the mounting height is not more than 8m, shielding objects are not required within 0.5m around the protection area, the horizontal distance from the wall edge and the beam edge is not less than 0.5m, and the horizontal distance from the wall edge and the beam edge to an air supply outlet of an air conditioner is not less than 1.5 m.
Wherein 1 audible and visual alarm is respectively arranged in each protection area and outside the entrance and exit door, and the installation height is 2-2.5 m away from the ground; all set up 1 alarm bell in every zone, when zone oxygen concentration drops to 10%, open alarm bell and warn, remind inside personnel to leave fast, alarm bell mounting height apart from ground 2 ~ 2.5 m.
Compared with the prior art, the fire-fighting system has the beneficial effects that the system can prevent fire and extinguish fire, and not only solves the problem that the existing fire-fighting system is not approved by the existing fire-fighting mandatory standard and cannot be popularized and applied; meanwhile, the defects that the traditional gas fire extinguishing system has low fire extinguishing success rate and can not extinguish solid deep fire are avoided; in addition, the system can cancel a pressure relief opening which is required to be arranged in the traditional gas fire extinguishing system, thereby solving the contradiction between the enclosure opening of the protective area, the constant temperature and humidity air conditioner arranged in the protective area and the safety and the theft prevention of the protective area.
Drawings
Fig. 1 is a schematic structural diagram of the present application.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It should be noted that "connected" and words used in this application to express "connected," such as "connected," "connected," and the like, include both direct connection of one element to another element and connection of one element to another element through another element.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when used in this specification the singular forms "a", "an" and/or "the" include "specify the presence of stated features, steps, operations, elements, or modules, components, and/or combinations thereof, unless the context clearly indicates otherwise.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Spatially relative terms, such as "above … …", "above … …", "above … …", "above", and the like, may be used herein for ease of description to describe the spatial relationship of one component or module or feature to another component or module or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the component or module in use or operation in addition to the orientation depicted in the figures. For example, if a component or module in the figures is turned over, components or modules described as "above" or "above" other components or modules or configurations would then be oriented "below" or "beneath" the other components or modules or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The components or modules may also be oriented in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
In the context of figure 1 of the drawings,
a fire damper;
a photoelectric smoke detector;
a temperature-sensitive detector;an oxygen concentration detector;
a door magnetic alarm;
an emergency start/emergency stop button;a manual/automatic transfer switch;
an audible and visual alarm;
an alarm bell;
a door light.
As shown in fig. 1, the present invention relates to a nitrogen automatic fire-fighting system for protecting a space for storing cultural relics, files or valuables such as metal, paper and silk products, audio and video products, artworks, specimens, books, bills, magnetic cards, data media, etc., which is relatively closed and no people or persons stay in a place for a short time; the system takes nitrogen prepared on site as a fire-fighting medium, and on the basis of the existing nitrogen-injection oxygen-control fire-fighting system, the system has the function of fire extinguishing after a fire disaster occurs by adding control elements, changing a control system and a control principle, adding a nitrogen supply device (which is used as standby equipment for fire prevention and nitrogen supply at ordinary times and is simultaneously put into use as fire extinguishing equipment during fire extinguishing), changing a pipe network and a nozzle design flow calculation method and the like, so that the requirement of the existing fire-fighting standard on the fire extinguishing function can be met.
Firstly, the working principle of the system of the invention is as follows:
it is known that the combustion must take place under three conditions, ① in the presence of combustible material, ② to reach the ignition temperature of the combustible material, ③ to reach oxygen content higher than a certain concentration in the air, that is, the fire can be prevented or extinguished by interrupting any relevant condition.
The invention can actively prevent fire and passively extinguish fire, separates oxygen and nitrogen in the air through the nitrogen supply device, injects the nitrogen output by the device into the protection area through the pipeline, dilutes or replaces the oxygen in the protection area, reduces the oxygen concentration in the protection area, destroys the necessary condition for fire occurrence, and realizes the functions of preventing fire and extinguishing fire. The system adopts a space total flooding system; the system can be a unit independent system or a combined distribution system; when a combined distribution system is adopted, electric valves must be arranged on the nitrogen supply pipeline and the air exchange pipeline of each protection area as subarea control elements. (see the attached drawing)
The protection zone is in an automatic fireproof operation state at ordinary times, the nitrogen supply device (1 with more devices) and electric valves on the nitrogen supply pipeline and the ventilation pipeline are automatically started and stopped according to the oxygen concentration detection signal of the protection zone, the oxygen concentration value in the protection zone is displayed, and an audible and visual alarm is given when the oxygen concentration value is too high or too low, and an alarm signal is output to a remote monitoring alarm arranged in a fire control room. When two groups of independent fire detection signals in a certain protection area confirm that the protection area has fire, the audible and visual alarm of the protection area automatically alarms and simultaneously turns on the door lamp, the system is converted into an automatic fire extinguishing state, the electric valves on the nitrogen supply and air exchange pipelines of the non-ignition protection area are automatically closed through the fire prevention and extinguishing control panel, the ventilation system and the opening closing device of the ignition protection area are closed, the electric valves on the nitrogen supply and air exchange pipelines of the ignition protection area are opened, and all the nitrogen supply devices are simultaneously opened and connected in parallel to inject nitrogen into the protection area to extinguish fire; when fire is extinguished, the gas spraying time is 120-180 min; in order to prevent re-combustion, the fire extinguishing dipping time is controlled to be 20-30 min; if necessary, the nitrogen supply device and the corresponding electric valve can be manually started and stopped by a manual/automatic on-site change-over switch and an emergency starting/emergency stopping button.
In the fireproof state, the design value of oxygen concentration is as follows:
oxygen concentration design value in fire extinguishing state:
the fire-fighting control panel and a remote monitoring alarm arranged in a fire-fighting control room are in linkage control; the remote monitoring alarm can be used for displaying and monitoring the fire prevention and extinguishing state, the oxygen concentration signal, the alarm signal, the running state of the nitrogen supply device and the opening and closing state of the electric valve, and can also be used for remotely and manually opening and closing the nitrogen supply device and the corresponding electric valve when necessary.
When the protection zone enters a person, an automatic/manual change-over switch outside the protection zone is switched to a manual control state. If fire alarm happens, the fire-fighting control panel only sends out alarm signals and does not output action instructions, and after the person on duty confirms the fire alarm, the person on duty presses down an emergency starting button on the fire-fighting control panel or outside the protection area door to put out the fire. When the person leaves, the change-over switch is restored to the automatic control state. In the automatic control state, manual control of the system may be preferentially performed.
When the system gives out a fire alarm, the fire condition is not generated after the on-site confirmation, and the system is not required to be started for fire extinguishing, the emergency stop button in the manual control box or on the fire-proof fire-extinguishing control panel can be pressed down, and the fire extinguishing procedure can be immediately stopped; when the fire is confirmed to occur on site but is extinguished, the emergency stop button in the manual control box or on the fire-fighting control panel is pressed, and the fire-fighting procedure can be stopped after 20-30 min.
The system of the invention comprises:
the system mainly comprises a nitrogen supply device, a nitrogen supply pipeline, a ventilation pipeline, a nitrogen injection nozzle, an electric valve, a fire extinguishing control panel, a remote monitoring alarm, an oxygen concentration detector, a smoke detector, a temperature detector, an acousto-optic alarm, an alarm bell, a door lamp, a door magnetic alarm, an emergency start/emergency stop button, a manual/automatic change-over switch, an enclosure structure, a power supply and the like.
1. A nitrogen supply device:
the nitrogen supply device adopts an air separation technology (a membrane separation method or a molecular sieve method) to prepare nitrogen from air; the nitrogen supply concentration is not lower than 95 percent, and the nitrogen supply pressure is 0.4 +/-0.1 MPa; the total gas supply quantity of the nitrogen supply device can meet the requirement of the nitrogen supply quantity when the largest protection area in volume is used for extinguishing fire, and the gas supply quantity of a single nitrogen supply device can meet the requirement of CECS189:2005 technical Specification for Nitrogen injection and oxygen control fire protection System (Table 4.0.5); an air compressor unit in the nitrogen supply device is arranged outside the protection area and is less than 50m away from the protection area; the gas separation unit can be combined with the air compressor unit, and can also be arranged in the protection area (when only 1 protection area is used, the discharged oxygen-enriched air is led out of the protection area); the oxygen discharged by the gas separation unit can be directly discharged and can be introduced into a room with people nearby for supplementing oxygen or operating an oxygen bar; one set of nitrogen supply device allows 8 protection areas to be protected, and the maximum protection space total volume is 8000m3。
2. A nitrogen supply pipeline:
the nitrogen supply pipeline is connected with a nitrogen outlet of the gas separation unit of the nitrogen supply equipment; can adopt an inner and outer hot galvanized steel pipe, an inner and outer plastic-coated steel pipe, a stainless steel pipe, a copper pipe or a PVC-C pipe; wherein DN of the galvanized pipe and the plastic-coated steel pipe is less than or equal to 50, and the galvanized pipe and the plastic-coated steel pipe are connected by screw; DN >50, groove connection; wherein, the stainless steel pipe and the copper pipe are welded by socket; wherein the PVC-C pipe is bonded; the pipe diameter of the nitrogen supply pipeline is calculated according to the fire extinguishing nitrogen amount of each protection area; the nitrogen supply pipelines in the protection area are symmetrically arranged, three-way pipe fittings are adopted for flow division as much as possible, and four-way pipe fittings are not adopted.
3. A ventilation pipeline:
the ventilation pipeline is used for balancing the air pressure of the protection area and preventing the enclosing structure inside the area from bearing overhigh internal pressure; one end of the air exchange pipeline is connected with the self-protection area, and the other end of the air exchange pipeline is connected with an air inlet of a compressor of the nitrogen supply equipment; can adopt an inner and outer hot galvanized steel pipe, an inner and outer plastic-coated steel pipe, a stainless steel pipe, a copper pipe or a PVC-C pipe; wherein DN of the galvanized pipe and the plastic-coated steel pipe is less than or equal to 50, and the galvanized pipe and the plastic-coated steel pipe are connected by screw; DN >50, groove connection; wherein, the stainless steel pipe and the copper pipe are welded by socket; wherein the PVC-C pipe is bonded; the pipe diameter of the ventilation pipeline in each protection area is the same as or larger than that of the nitrogen supply pipeline.
4. Nitrogen injection nozzle:
adopting a 360-degree copper chromium plating full-submerged open type spray head, connecting the spray head with a pipeline by threads, adopting a large head and a small head, and forbidding using a compensating core; at least 2 spray heads are arranged in each protection area.
5. Electric valve:
when the number of the protection zones is more than 1, electric valves are required to be arranged on the nitrogen supply branch pipe and the air exchange branch pipe of each protection zone, and the valves adopt imported or exclusive products.
6. Fire extinguishing control panel:
the fire extinguishing control panel is arranged in a centralized manner in a place where people often exist outside a protection area, and can also be arranged in a duty room or a fire control room. The 1 set of fire extinguishing control panel is used for carrying the functions of fire prevention, fire extinguishing, monitoring, alarming and the like of less than or equal to 8 protection areas.
7. Remote monitoring alarm:
the fire-fighting control room is arranged for receiving fire information, fire-fighting actions, manual and automatic conversion, system equipment faults and the like of each protection area, and can be remotely controlled when necessary.
8. An oxygen concentration detector:
the oxygen concentration detector is used for detecting the oxygen concentration of the protection area and outputting an oxygen concentration signal to the fire-fighting control panel; every protection zone sets up 2 oxygen concentration detector, and its setting position in the flame retardant zone should be apart from annotating nitrogen shower nozzle and be not less than 2m, and the mounting height is apart from ground 1.5 ~ 1.6 m.
9. A smoke detector:
1-2 photoelectric smoke detectors are arranged on a suspended ceiling or a ceiling in each protection area, the installation height is not more than 12m, shielding objects are not required within 0.5m around the protection area, the horizontal distance from the wall side and the beam side is not less than 0.5m, and the horizontal distance from the wall side and the beam side to an air supply outlet of an air conditioner is not less than 1.5 m.
10. A temperature-sensitive detector:
and 1-2 temperature-sensitive detectors are arranged on the suspended ceiling or the ceiling in each protection area, the mounting height is not more than 8m, shielding objects are not required within 0.5m around the protection area, the horizontal distance from the wall edge and the beam edge is not less than 0.5m, and the horizontal distance from the wall edge and the beam edge to an air supply outlet of an air conditioner is not less than 1.5 m.
11. Audible and visual alarm:
and 1 audible and visual alarm is respectively arranged in each protection area and outside the entrance and exit door, and the installation height is 2-2.5 m away from the ground.
12. Alarm bell:
all set up 1 alarm bell in every zone, when zone oxygen concentration drops to 10%, open alarm bell and warn, remind inside personnel to leave fast, alarm bell mounting height apart from ground 2 ~ 2.5 m.
13. Emergency start/emergency stop button:
all set up 1 emergency start/emergency stop button outside every zone, mounting height is apart from ground 1.5 ~ 1.6 m.
14. Manual/automatic transfer switch:
and 1 manual/automatic change-over switch is arranged outside each protection area, and the installation height is 1.5-1.6 m away from the ground.
15. Door lamp:
every protective area door top establishes 1 door lamp, when certain protective area gets into the state of putting out a fire, starts the door lamp.
16. Door magnetism alarm:
when people enter the protection area, a door magnetic alarm is started; the door magnetic alarm is arranged outside the protection area, and the installation height is 1.5-1.6 m away from the ground.
17. The building envelope:
because the air intake and the air discharge of the protection area are basically the same and the air supply pressure is lower, the enclosure structure does not need to bear larger internal pressure, a common firewall can be adopted, and a pressure relief opening is not needed. The doors and windows in the protection area are self-closing fireproof doors and windows and are sealed by a special SIR silicon rubber sealing rubber strip. All pipeline through holes of the building envelope must be plugged; the wall must be laid to the top.
18. Power supply:
the system power supply adopts double power supplies or double loops to ensure fire-fighting power.
The invention is suitable for protecting places for storing valuables such as metal, paper and silk products, audio and video products, artworks, specimens, books, bills, magnetic cards, data media and the like, and can also be used for protecting special places such as dangerous goods, chemicals, military fires, nuclear bombs, electronic components and parts, exploitation and storage of fuels, power distribution rooms, cable interlayers and the like; the fire-fighting system comprises a fire-fighting system which normally uses air separation technology (membrane separation method or molecular sieve method) to prepare nitrogen on site from air as a fire-fighting air source and uses the nitrogen prepared on site as a fire-fighting air source during fire fighting; the fire-fighting system also comprises a fire-fighting system which usually uses air separation technology (membrane separation method or molecular sieve method) to prepare nitrogen on site from air as a fire-fighting gas source, and uses other inert gases, hydrofluorocarbon gases or CO2 gases which are canned and stored in a low-pressure state as a fire-fighting gas source during fire fighting. The control of the system takes an oxygen concentration detector and a fire detector in a protection area as control signal sources, and takes an electric valve or an electromagnetic valve on a nitrogen supply pipeline and a ventilation pipeline of the protection area as a subarea control element. The fire prevention and extinguishing function can be realized by 1 fire prevention and extinguishing control panel/box, and can also be divided into 1 fire prevention and extinguishing control panel/box and 1 fire extinguishing control panel/box; the fire-fighting control panel/box and the remote monitoring alarm can be arranged separately or combined. Protection is sought for the following claims.
The invention prepares nitrogen through 1 nitrogen supply device at ordinary times and injects nitrogen into the protective area through the pipeline, and controls the oxygen concentration of the protective area to be always maintained at the level that the combustible materials can not be burnt; when the protection area catches fire, the electric valve on the nitrogen pipeline of the non-firing protection area is closed in a linkage mode through the fire detection signal, the electric valve on the nitrogen pipeline of the firing protection area is opened at the same time, and 2-3 nitrogen supply devices are opened to spray nitrogen to the firing protection area at the same time to extinguish fire. The normal low-oxygen environment of the protection zone can also protect cultural relics, files, valuables and the like to slow down the oxidation speed and prolong the storage time, so the system is not only a fire protection system but also an anti-oxidation protection system. The system can prevent fire and extinguish fire, and not only solves the problems that the existing fire protection system is not approved by the existing fire protection mandatory standard and cannot be popularized and applied; meanwhile, the defects that the traditional gas fire extinguishing system has low fire extinguishing success rate and can not extinguish solid deep fire are avoided; in addition, the system can cancel a pressure relief opening which is required to be arranged in the traditional gas fire extinguishing system, thereby solving the contradiction between the enclosure opening of the protective area, the constant temperature and humidity air conditioner arranged in the protective area and the safety and the theft prevention of the protective area.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A nitrogen automatic fire prevention and extinguishing system is characterized by comprising: the device comprises a nitrogen supply device, a nitrogen supply pipeline, a ventilation pipeline and a nitrogen injection nozzle, wherein one end of the nitrogen supply pipeline is connected with a nitrogen outlet of a gas separation unit of the nitrogen supply device, and the other end of the nitrogen supply pipeline is connected with the nitrogen injection nozzle arranged in a protection area; the ventilation pipeline is used for balancing air pressure of the protection area, one end of the ventilation pipeline is connected with an air inlet of the air compressor unit of the nitrogen supply device, and the other end of the ventilation pipeline is connected with one end of the ventilation pipeline.
2. The automatic fire prevention and extinguishing system using nitrogen according to claim 1,
the nitrogen supply device is used for preparing nitrogen from air by adopting an air separation technology; the nitrogen supply concentration is not lower than 95 percent, and the nitrogen supply pressure is 0.4 +/-0.1 MPa; an air compressor unit in the nitrogen supply device is arranged outside the protection area and is less than 50m away from the protection area; the gas separation unit is combined with the air compressor or arranged in the protection area; the oxygen discharged by the gas separation unit is directly discharged, or is introduced into a room with people nearby for supplementing oxygen or operating an oxygen bar.
3. An automatic fire prevention and extinguishing system using nitrogen as claimed in claim 1, wherein the nitrogen supply pipes in the protected area are symmetrically arranged and divided by tee pipe.
4. An automatic fire prevention and extinguishing system using nitrogen as claimed in claim 1, further comprising: the fire extinguishing control panel, and a remote monitoring alarm, an oxygen concentration detector, a smoke detector, a temperature-sensitive detector, an audible and visual alarm, an alarm bell and an electric valve which are connected with the fire extinguishing control panel.
5. An automatic fire prevention and extinguishing system using nitrogen as claimed in claim 4, wherein when the number of the protection areas is more than 1, electric valves are provided on the nitrogen supply pipeline and the air exchange pipeline in each protection area.
6. An automatic fire prevention and extinguishing system using nitrogen as claimed in claim 4, wherein the fire extinguishing control panel is installed either outside the protected area or in the duty room or fire control room.
7. The automatic nitrogen fire prevention and extinguishing system according to claim 4, wherein the remote monitoring alarm is arranged in a fire control room and used for receiving fire information, fire prevention and extinguishing actions, manual and automatic conversion and system equipment faults of each protection area, and remote control can be performed.
8. The automatic fire prevention and extinguishing system using nitrogen as claimed in claim 4, wherein the oxygen concentration detector is used for detecting the oxygen concentration in the protected area and outputting an oxygen concentration signal to the fire prevention and extinguishing control panel; every protection zone sets up 2 oxygen concentration detector, and its setting position in the flame retardant zone should be apart from annotating nitrogen shower nozzle and be not less than 2m, and the mounting height is apart from ground 1.5 ~ 1.6 m.
9. An automatic nitrogen fire prevention and extinguishing system according to claim 4, wherein 1-2 photoelectric smoke detectors are arranged on a suspended ceiling or a ceiling in each protection area, the installation height is not more than 12m, no shielding object is arranged in 0.5m around the ceiling, the horizontal distance from the wall edge and the beam edge is not less than 0.5m, and the horizontal distance from the air conditioner air supply outlet is not less than 1.5 m; and 1-2 temperature-sensitive detectors are arranged on the suspended ceiling or the ceiling in each protection area, the mounting height is not more than 8m, shielding objects are not required within 0.5m around the protection area, the horizontal distance from the wall edge and the beam edge is not less than 0.5m, and the horizontal distance from the wall edge and the beam edge to an air supply outlet of an air conditioner is not less than 1.5 m.
10. An automatic nitrogen fire prevention and extinguishing system according to claim 4, wherein 1 audible and visual alarm is respectively arranged in each protection area and outside the entrance and exit door, and the installation height is 2-2.5 m from the ground; all set up 1 alarm bell in every zone, when zone oxygen concentration drops to 10%, open alarm bell and warn, remind inside personnel to leave fast, alarm bell mounting height apart from ground 2 ~ 2.5 m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920501824.5U CN210057236U (en) | 2019-04-12 | 2019-04-12 | Automatic nitrogen fire prevention and extinguishing system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920501824.5U CN210057236U (en) | 2019-04-12 | 2019-04-12 | Automatic nitrogen fire prevention and extinguishing system |
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| CN210057236U true CN210057236U (en) | 2020-02-14 |
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| CN201920501824.5U Active CN210057236U (en) | 2019-04-12 | 2019-04-12 | Automatic nitrogen fire prevention and extinguishing system |
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| CN (1) | CN210057236U (en) |
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