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News Detail
  • Hexafluoropropane fire extinguishing system
    categories of news:Company news   作者:handler    发布于:2016-11-254    文字:【】【】【

    introduction

    5.1 Overview of the fire extinguishing agent

    Hexafluoropropane HFC-227ea (also known as FM200, chemical formula: CF3CHFCF3) fire extinguishing agent is a colorless, tasteless, non-corrosive, low toxicity, non-conductive, high efficiency of fire gas, clean and pollution-free, no damage to the atmospheric ozone layer (Ozone depletion potential ODP is zero). Heptafluoropropane as a fire extinguishing agent of the gas fire extinguishing system is currently considered an alternative to halide 1211,1301 fire extinguishing system of the ideal product, has been widely used at home and abroad.

    5.1.1 Fire extinguishing mechanism

    1) Chemical Suppression: Heptafluoropropane fire extinguishing agent can inactivate the active free radicals in the flame, blocking the chain reaction during combustion.

    2) Cooling: Heptafluoropropane fire extinguishing agent in the nozzle, the liquid fire extinguishing agent quickly into a gas need to absorb a lot of heat, reducing the protection zone around the flame temperature.

    3) Asphyxiation: The discharge of the extinguishing agent in the reserve reduces the concentration of oxygen and reduces the rate of combustion.

    5.1.2 Scope of application

    Heptafluoropropane extinguishing agent can extinguish the following fires Heptafluoropropane fire extinguishing agent can not extinguish the following substances

    a) electrical fires

    b) Solid surface fire

    c) liquid fire

    d) gas fires that can be cut off before extinguishing a) nitric acid, oxidizing agents such as sodium nitrate and chemical containing oxidants

    Product fire

    b) Potassium, magnesium, sodium, titanium, pick, uranium and other active metal fires

    c) metal hydride fire such as potassium hydride, sodium hydride and the like

    d) Hydrogen peroxide, hydrazine and other self-decomposition of chemical substances fire

    e) Deep fire in combustible solid matter

    5.2 system works, start mode

    5.2.1 working principle and work flow

    When the fire detector (temperature detector, smoke detector) to detect the fire, the fire signal feedback to the fire alarm controller, fire alarm controller control sound and light alarm, issued a withdrawal alarm signal. At the same time, the fire alarm controller will signal to the gas fire control panel, controlled by the gas fire control panel linkage device, 30 seconds delay, the electromagnetic drive to start the signal (DC24V, 1.5A), the electromagnetic drive to drive the gas container valve , The drive gas sequence to open the selection valve, fire extinguisher bottle container valve, the release of fire extinguishing agent, fire extinguishing agent spray through the nozzle to the protected area, to achieve the purpose of fire. When the fire extinguishing agent flows through the pipeline, the signal feedback device action, the electrical signal back to the gas fire control panel, indicating that the fire extinguishing agent has been sprayed.

    Figure 1 system work flow chart

    5.2.2 System startup mode

    The system has automatic start, manual start and mechanical emergency start three start mode.

    1) Automatic start

    When the control mode of the fire alarm control device is placed in the "automatic" position, the whole fire extinguishing system is in the automatic start state. When the fire in the protection zone occurs, the alarm control device sends out the signal, controls the sound and light alarm, sends out the evacuation alarm signal, And control linkage equipment (fans, air conditioning, etc.). The delay of 30s issued a fire extinguishing order to open the drive gas bottle group, the release of the drive gas, open the corresponding protection zone selection valve and fire extinguisher bottle group, the release of fire extinguishing agent, the implementation of fire.

    2) Manual start

    When the fire in the protected area occurs, press the manual button (or the start button on the "Emergency start / stop" button of the fire alarm control unit), open the drive gas bottle set, release the drive gas, and turn on the corresponding Protection zone selection valve and fire extinguisher bottle group, the release of fire extinguishing agent, the implementation of fire.

    Note: The emergency stop operation is when the system issued a fire alarm or manually start the system, the system delay time found abnormal (false alarm, the staff did not evacuate, etc.), without the need to start the system release fire extinguishing agent Press the stop button on the front of the protective area to prevent the extinguishing of the extinguishing agent.

    3) mechanical emergency start

    In the case of automatic and manual start failure, the operator first close the linkage device, windows and other unnecessary openings, manually open the drive gas bottle group on the electromagnetic drive, open the drive gas bottle group, release the drive gas, open the corresponding selector valve, Fire extinguisher bottle group, the release of fire extinguishing agent, the implementation of fire. Such as the case of electromagnetic drive, driving gas bottle group for unknown reasons can not open the corresponding selection valve, fire extinguisher bottle group, then manually open the corresponding protection zone selection valve, and then manually open the fire extinguisher bottle group, the release of fire extinguishing agent, Extinguishing.

    WARNING: Must be operated by a specially trained person who has been trained and skilled in the operation of the system. Mechanical emergency start-up is not part of the system's normal start-up and can only be used as a final measure in an emergency.

    5.3 System classification composition

    Heptafluoropropane gas fire extinguishing system for the whole submerged fire extinguishing system, mainly by the fire detection system (fire detectors, alarm controller), fire control system (gas fire control panel, sound and light alarm, emergency start / stop button, etc.) and gas fire extinguishing system Three major components. Gas fire extinguishing system is divided into unit independent system, combined distribution system.

    Unit independent system: a supply of heptafluoropropane, through a fixed pipe network and nozzle, the protection of a single protected area or protection object. The system can be operated without a selector valve, using a single drive gas bottle set to start all the 7-fluoropropane fire extinguisher bottle set.

    Combined distribution system: a supply of heptafluoropropane, through the regional selection valve, fixed pipe network and nozzle, two or more protected areas or protection objects to protect.

    5.4 System model

    Hexafluoropropane fire extinguishing equipment Model Description:

    QMQ 4.2 / * N

    Compression mode: N on behalf of the storage pressure

    Fire extinguisher bottle volume: 70,90,120,150,180, unit: L

    Fire extinguishing agent storage pressure, unit: MPa

    Hexafluoropropane fire extinguishing equipment

    5.5 The main parameters

    Design working pressure (20 ℃) (MPa) 4.2

    Fire extinguishing agent injection time (s) ≤10

    System operating temperature (℃) 0 ~ 50

    System operating voltage (V) DC24

    System operating current (A) 1.5

    Driving gas bottle filling pressure (20 ℃) (MPa) 6.0

    The main components of the system

    6.1 fire extinguisher bottle group

    Figure 3 Group of extinguishants and container valves

    6.1.1 Structure: Mainly by the container, container valve, manual device, siphon, safety relief device, fire extinguisher sampling port, pressure gauge and mist spray protection device and so on.

    6.1.2 Instructions for use

    According to the design requirements of filling fire extinguishing agent and pressurized nitrogen, heptafluoropropane fire extinguishing agent in liquid form stored in the bottle group.

    1) Automatic, manual start, from the control of the gas bottle into the control unit into the manual device, driving the needle to open the container valve, the release of fire extinguishing agent.

    2) Mechanical emergency start: When the pneumatic way can not open the container valve, pull out the manual insurance pin (with nameplate logo), press the manual device manually press the cap to open the container valve. But in the combined distribution system, you should first open the corresponding protection zone selector valve, and then press the manual pressure cap.

    3) When the pressure in the bottle group exceeds the pressure of the safety diaphragm, the safety diaphragm blows itself and the fire extinguishing agent is released through the safety hole.

    4) The valve is equipped with a pressure gauge switch, under normal circumstances can lock the pressure gauge switch to ensure that the pressure gauge at the seal. On a regular basis, loosen the nuts in one step of the nuts.

    5) The pressure gauge is equipped with a pressure gauge valve so that the pressure gauge can be removed and the pressure gauge can be replaced in the field.

    caveat:

    (1) When the container valve is disconnected from the system piping, the mist spray guard (commonly known as "protective cap") must be installed on the container valve outlet. Failure to install the protective cap will cause the cylinder to move vigorously when it is inadvertently started. Violation of this warning may result in death, personal injury or property damage.

    (2) When disassembling / replacing the pressure gauge, make sure that the fastening nut is in the locked condition and be careful not to rotate with the pressure gauge. So as to avoid gas leakage and joint loose fly out, hurt the staff. Violation of this warning may result in death, personal injury or property damage.

    (3) non-emergency operation, it is strictly forbidden to pull out the manual insurance pin, press the manual button. When delivered, the auxiliary insurance pin must be pulled out, otherwise the bottle group can not start.

    6.1.3 fire extinguishing agent filling method

    When filling, tighten the pressure gauge of the bottle, loosen the nut 2 times, use the special filling equipment connector connected with the pressure gauge mount, filling from the pressure gauge interface. The superfluoropropane fire extinguishing agent is pressurized by means of a special filling device to be introduced into the group of extinguishants. And then use the same method slowly to the bottle pressurization, pressurized medium for the nitrogen (nitrogen purity in line with the requirements of GB / T 8979), when the bottle pressure to GB25972-2010 the pressure required to stop pressurization, unloading Filling equipment, installing pressure gauges, and then tighten the nuts.

    Note: In view of the high degree of automation of the system, the system links, sealing performance requirements. The filling of the fire extinguishing agent shall be completed by the qualified enterprise or the company, and it is strictly forbidden to fill the self-qualified unit.

    6.1.4 basic parameters

    Specification Model Volume

    (L) container valve nominal diameter (mm) bottle height

    H (mm) bottle outer diameter D (mm)

    QMP70 / 4.270DN321280Φ325

    QMP90 / 4.290DN321515Φ325

    QMP120 / 4.2120DN401345 Φ415

    QMP150 / 4.2150DN401390Φ465

    QMP180 / 4.2180DN501380Φ520

    Maximum working pressure (50 ℃): 5.3MPa; filling pressure (20 ℃): 4.2MPa; maximum filling density ≤ 950Kg / mm³

    6.2 Drive gas bottle set

    Figure 4 Drive gas bottle set

    6.2.1 Structure: mainly by the container, drive gas container valve, electromagnetic drive (with indicator) and pressure gauge composition, and filled with nitrogen.

    6.2.2 Instructions for use

    1) Automatic, manual start, when the fire occurs, the fire alarm controller output start signal (DC24V, 1.5A), the corresponding drive gas bottle container valve on the electromagnetic actuator within the solenoid pull, puncture piercing the diaphragm, Open the drive gas container valve, release the high pressure nitrogen gas in the driving gas bottle group, turn on the corresponding selection valve, the fire extinguisher bottle container valve and release the heptafluoropropane fire extinguishing agent through the gas control pipeline control.

    2) mechanical emergency start, first pull out the electromagnetic drive on the limit device, manually tapping (press) manual button, open the drive gas bottle group. If there is no pressure in the case of pressurized gas or because of troubleshooting, the selector valve, fire extinguisher bottle group and fire extinguishing agent should be opened manually in sequence.

    3) The valve is equipped with a pressure gauge switch, under normal circumstances can lock the pressure gauge switch to ensure that the pressure gauge at the seal. On a regular basis, loosen the nuts in one step of the nuts. After checking, the pressure gauge switch should be locked.

    4) The pressure gauge is equipped with a pressure gauge switch so that the pressure gauge can be removed and the pressure gauge can be replaced in the field.

    5) Check the electromagnetic drive, you need to insert the insurance pin, to prevent misuse, check the end, pull out the insurance pin.

    caveat:

    (1) When disassembling / replacing the pressure gauge, make sure that the fastening nut is in the locked state and be careful not to rotate with the pressure gauge. So as to avoid gas leakage and joint loose fly out, hurt the staff. Violation of this warning may result in death, personal injury or property damage.

    (2) in the case of non-emergency, it is strictly prohibited to pull out the limit device, press the manual button, otherwise, will cause the system to start.

    6.2.3 basic parameters

    specification

    Model Loading pressure (MPa) Working pressure (MPa) Volume (L) Total height H (mm) Operating voltage V) Operating current (A)

         QQP8 / 6.0 6.0 8 720 DC 24 ≤1.5

    6.3 Liquid check valve

    Figure 5 Liquid check valve

    6.3.1 structure: mainly by the valve body, spool composition.

    6.3.2 Instructions for use

    1) The liquid check valve is used to prevent the extinguishant from flowing back from the manifold to the bottle. The upper end is connected to the one-way valve seat of the manifold and the lower end is connected to the connecting pipe and should be mounted vertically (note that the arrow is facing up).

    2) When the fire extinguishing agent is released, the fire extinguishing agent flows through the connecting pipe and lifts the liquid check valve spool, which is collected in the manifold.

    6.3.3 basic parameters

    Specifications Model Diameter φ (mm) Outside diameter D (mm) Connection thread M1 Connection thread M2 Length L (mm)

    QYD32 / 5.33266 M48 × 2 M48 × 2 108

    QYD40 / 5.34080 M60 × 2 M60 × 2 123

    QYD50 / 5.35094 M68 × 2 M72 × 2 132

    6.4 Gas check valve

    Figure 6 Gas check valve

    6.4.1 structure: mainly by the valve body, spool and other components.

    6.4.2 Instructions for use: for the distribution of the distribution system, installed in the gas control pipeline, used to control the drive gas one-way flow, control the number of open bottle.

    Note: The gas check valve has the installation direction, must be consistent with the engineering design, otherwise the system will fail.

    6.4.3 basic parameters

    Specifications Model Working pressure (MPa) Opening pressure (MPa) Nominal diameter (mm) Both ends of the connection thread

    QD6 / 17.217.2≤0.16M10x1.5

    φ8 flare

    6.5 connecting pipe

    Figure 7 Connecting tube

    6.5.1 Structure: mainly composed of stainless steel bellows and stainless steel wire sets, both ends of the connection nut.

    6.5.2 Instructions for use: Connect between the fire extinguisher bottle container (outlet) and the liquid check valve (inlet). Both ends are sealed with an O-ring. Because it is a flexible component, easy to install, and play a role in the role of pressure buffer.

    6.5.3 basic parameters

    Specifications Model Nominal diameter (mm) Working pressure (MPa) Connection thread M Total length L (mm)

    QRG32 / 5.3325.3M45 x 2400

    QRG40 / 5.3405.3M45 × 2500

    QRG50 / 5.3505.3M64 × 2600

    6.6 safety valve

    Figure 8 safety valve

    6.6.1 Structure: mainly by the valve body, safety blasting diaphragm assembly and safety bonnet composition.

    6.6.2 Instructions: The safety valve is usually installed on the side of the collector, when the pressure in the manifold is greater than the allowable value, the safety of the burst blasting, discharge pressure, play a protective system.

    Note: The relief valve should not face the operating surface, channel and so on.

    6.6.3 Basic parameters

    Specifications Model Diaphragm Blasting pressure (MPa) Connection thread

    QAX7.57.2 ± 0.375R 1/2

    6.7 Select the valve

      

    Figure 9 Select the valve

    6.7.1 Structure: mainly by the valve body, spool, pressure arm, arm, handle and drive cylinder and other components.

    6.7.2 Instructions for use

    1) The selector valve is used in a combined distribution system to control the flow of fire extinguishing media. Installed on the selector valve seat, one for each guard. Serving

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Contact: Mr. Chen  Tel:13928768802  Mr. Huang  Phone:13711155165  Landline:020-31143089   fax:020-31143992   mailbox:1851885478@qq.com   Address: No. 15, Yongfeng Road, Shawan Town, Panyu District, Guangzhou City, Guangdong Province, China   Record license number:粤ICP备16114979

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