| 详细介绍： 进口阻火阀
德国阻火器又名防火器、管道防火器，是防止外部火焰窜入存有易燃易爆气体的设备、管道内或阻止火焰在设备、管道间蔓延。它是用来阻止介质（如氢气，氧气等）火焰向外蔓延的安全装置，由一种能够通过气体的、具有许多细小通道或缝隙的固体材料（阻火元件）所组成。管道防爆阻火器是用来阻止易燃气体、液体的火焰蔓延和防止回火而引起爆炸的安全装置。通常装在输送或排放易燃易爆气体的管线上。如火炬、加热燃烧系统、石油气体回收系统或其他易燃气体系统。在早期阻火器就已被应用在石油工业中，以后又广泛用用于矿山、煤矿、水运及化学工业中。在石油工业中，阻火器被广泛应用在石油及石油产品的储罐上。当储存轻质石油产品的油罐遇到明火或雷击时，就可能引起火灾。为了防止这种危险的产生而使用阻火器。
进口阻火器 - 工作原理 （传热作用、器壁效应）
传热作用：
燃烧所需要的必要条件之一就是要达到一定的温度,即着火点。低于着火点,燃烧就会停止。依照这一原理,只要将燃烧物质的温度降到其着火点以下,就可以阻止火焰的蔓延。当火焰通过阻火元件的许多细小通道之后将变成若干细小的火焰。设计阻火器内部的阻火元件时,则尽可能扩大细小火焰和通道壁的接触面积,强化传热,使火焰温度降到着火点以下,从而阻止火焰蔓延。
器壁效应：
燃烧与爆炸并不是分子间直接反应,而是受外来能量的激发,分子键遭到破坏,产生活化分子,活化分子又分裂为寿命短但却很活泼的自由基,自由基与其它分子相撞,生成新的产物,同时也产生新的自由基再继续与其它分子发生反应。当燃烧的可燃气通过阻火元件的狭窄通道时,自由基与通道壁的碰撞几率增大,参加反应的自由基减少。当阻火器的通道窄到一定程度时,自由基与通道壁的碰撞占主导地位,由于自由基数量急剧减少,反应不能继续进行,也即燃烧反应不能通过阻火器继续传播。
随着阻火器通道尺寸的减小, 自由基与反应分子之间碰撞几率随之减少, 而自由基与通道壁的碰撞几率反而增加, 这样就促使自由基反应减低。当通道尺寸减少到某一数值时, 这种器壁效应就造成了火焰不能继续传播的条件, 火焰即被阻止。因此器壁效应是防止火焰的主要机理。
进口阻火器 - 测度标准
对阻火器进行测试鉴定的要求，世界各国不尽相同，现将几个国家对阻火器测试要求的情况简介如下：
（1）英国消防研究部门要求阻火器应具备阻爆和耐烧两种性能。测试阻火器的介质不能使用氢气和乙炔气体，规定使用丙烷。阻火器耐烧时间要求2小时。
（2）德国标准规定，对于容量大于1000升的储罐上用的阻火器必须具备阻爆和耐烧两种性能。试验介质不能用氢气和乙炔气体，要求阻火器耐烧时间为2小时。
（3）苏联对阻火器要求具备阻爆和耐烧两种性能。试验用的介质即为阻火器使用时的介质。阻火器耐烧时间要求为2小时。
（4）日本对阻火器要求进行阻爆和耐烧性能的试验，试验介质可用已烷气体。
（5）美国 于1936年制定石油及汽油储罐阻火器测试国家标准，后又经过几次修订。标准要求石油储罐上的阻火器应具备阻爆和耐烧两种性能
进口阻火器主体材质
A3（WCB） L2 304（CF3） 316（CF8M） 316（CF3M） 衬里
公称通径/压力：DN15-400mm(1/2-16”) PN0.6-5.0MPa(150-600Lb)
阻火层材质：304 304L 316 316L 哈氏合金 蒙乃尔合金
防爆等级 BS 5501：IIA IIB IIC
螺帽螺栓：20# 304 304L 316 316L
密封垫片：丁晴橡胶垫片 聚四氟乙烯垫片 石墨垫片
密封面：突面（RF） 平面（FF） 凹凸面（MFM） 榫槽面（TG）
法兰标准：HG GB HGJ JB ANST JIS DIN SB NF
连接形式：法兰连接（II） 内螺纹连接（III） 外螺纹连接（IV） 对焊连接（I）
工作温度：碳钢：-30℃~+350℃ 不锈钢：-80℃~+480℃
产地品牌：德国ORSEN奥尔申
北京华泰辉阀门有限公司（http://www.bj-valve.net)是德国ORSEN奥尔申阀门集团在中国的唯一代理，其业务为负责德国ORSEN奥尔申阀门集团在中国的唯一渠道运作，是中国大陆唯一有权授权一级代理单位，我处迄今只针对项目授权，并未授权区域代理商。 公司以一流的研发和生产中心，覆盖全球的销售（010-57165677、13718983583)和服务网络，卓越的品质和资源优势，得到国际上许多石化、电力、冶金用户的认同。
Imported Fire valve
Germany, also known as fire flame arresters, pipe flame arrestor is to prevent external flame fleeing there are flammable or explosive gas equipment, pipeline or prevent flame spread between devices, pipes. It is used to prevent the media (such as hydrogen, oxygen, etc.) safety means flame spread outwardly by a through gas passage having a plurality of small slits or solid material (fire retardant element) formed. Pipeline explosion flame arrester is used to prevent flammable gas, liquid flame spread and cause a safety device to prevent tempering explosion. Usually mounted on a pipeline to transport flammable gases or emissions. Such as a torch, burning heating systems, oil vapor recovery system or other flammable gas systems. In the early arrester had been used in the oil industry, and later widely used for mining, coal, water and chemical industries. In the oil industry, the flame arrester is widely used in the petroleum and petroleum products storage tanks. When light petroleum product storage tanks encountered fire or lightning, it may cause a fire. In order to prevent this danger generated using flame arrester.
Import flame arrester - works (heat effect, the wall effect)
Heat effect:
One of the necessary conditions required for combustion is to reach a certain temperature, the ignition point. Below the ignition point, the burning stops. According to this principle, as long as the combustion temperature of the substance dropped below its ignition point, can prevent the spread of flame. After many of the small passage through the flame arrester element will become some tiny flame. When designing the interior of the arrester arrester elements to maximize the contact area is small and the channel wall of flame, heat transfer enhancement, the flame temperature drops below the ignition point, thereby preventing the spread of flame.
Wall effect:
Combustion and explosion is not directly between molecular reaction, but by external excitation energy of molecular bond destruction, resulting in the activation of molecules, activation of molecular life again split into short but very active free radicals collide with other molecules to generate a new product, but also produce new radicals then reacted continued with other molecules. When the combustion gas through the narrow channel can fire retardant elements, free radicals and the channel wall collision probability increases, reducing free radicals participate in the reaction. When the flame arrester narrow channel to a certain extent, impact of free radicals and the channel wall dominates due to the sharp reduction in the number of free radicals, the reaction does not proceed, that the combustion reaction can not continue to spread through the flame arrester.
With the passage between the decreasing size of the flame arrester, free radicals and reactive molecules collision probability be reduced, while the Radicals and the channel wall but increased probability of collision, thus reducing the urge radical reactions. When the channel size reduction to a certain value, which is causing the condition of the wall effect can not continue to flame propagation, flame Jibei blocked. Thus the wall effect is the main mechanism to prevent the flame.
Import flame arrester - Measure Standards
Identification of the flame arrester test requirements vary around the world, now several national test requirements for flame arrestor as outlined below:
(1) British fire research department for the arrester should have burst resistance and resistance to fire two properties. Arrester test media can not use hydrogen and acetylene gas, require the use of propane. Fire-resistant burn time requirement is two hours.
(2) German standards, the capacity for more than 1000 liters of storage tanks must have a flame arrester explosion resistance and resistance to fire two properties. Test medium can not be used hydrogen and acetylene gas, burn resistance requirements Zuhuo time is 2 hours.
(3) requires the Soviet arrester explosion resistance and resistance to fire two properties. Test medium is the medium flame arrester use. Zuhuo resistant burn time requirements for two hours.
(4) Japan arrester test requirements, test media explosion resistance and resistance to fire performance available hexane gas.
(5) the United States to develop oil and gasoline tanks arrester test national standard in 1936, and then after a few revisions. Standard oil tank on the flame arrester should have burst resistance and resistance to fire two properties
Import flame arrester main material
?A3 (WCB) L2 304 (CF3) 316 (CF8M) 316 (CF3M) lining
Nominal diameter / pressure: DN15-400mm (1 / 2-16 ") PN0.6-5.0MPa (150-600Lb)
Fire Layer Material: 304 304L 316 316L Hastelloy Monel
Explosion levels BS 5501: IIA IIB IIC
Nuts Bolts: 20 # 304 304L 316 316L
Gasket: NBR Gasket PTFE gasket graphite gasket
Sealing surface: raised face (RF) plane (FF) convex surface (MFM) tongue and groove (TG)
Flange Standard: HG GB HGJ JB ANST JIS DIN SB NF
Connection: Flanged (II) threaded connection (III) external thread connection (IV) welded connections (I)
Working temperature: carbon steel: -30 ℃ ~ + 350 ℃ stainless steel: -80 ℃ ~ + 480 ℃
Brand Origin: Germany ORSEN Orr Shen
Beijing Huatai Hui Valve Co., Ltd. (http://www.bj-valve.net) is the only agent in Germany ORSEN Orr Shen Valve Group in China, and its business is in charge of the German ORSEN Orr Shen Valve Group only channel operations in China , mainland China is the sole right to authorize an agent, I place so far only for projects authorized, not authorized regional agent. Company-class R & D and production center, global sales (010-57165677,13718983583) and service network, superior quality and resources, many international petrochemical, power, metallurgy user's identity.
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