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如何防止彩涂板固化炉发生着火爆炸的危险

返回列表 来源: 发布日期: 2019.09.27

如何防止彩涂板固化炉发生着火爆炸的危险

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钢带涂膜后在固化炉中干燥固化,涂膜中大部分有机溶剂会逐渐蒸发。当涂料中的溶剂挥发分与空气在150-450(?)的炉温下混合时。c、可能发生火灾和爆炸,极其危险。

安徽太和彩板厂家_彩涂板固化炉_天物彩板
溶剂挥发分与空气混合时,斜区为爆炸区。根据爆炸情况,防火防爆措施主要有两种:
(1)控制彩涂板固化炉大气中有机溶剂20的含量,使其低于爆炸下限的1/4、1/6甚至1/8,一般采用爆炸下限的1/4(即25%IEL)。报警浓度一般设置三个报警级别,采取不同的防爆措施:当有机溶剂浓度达到25%LEL时,系统报警并自动启动事故送风机;当有机溶剂浓度达到35%LEL时,当有机溶剂浓度达到50%时,滚筒涂布机自动停止涂布操作。在L,整条线路应该紧急停止。这种控制方法一般用于热风循环固化炉和远红外加热固化炉。固化炉的操作要求负压操作。
(2)为控制彩涂板固化炉内氧含量,采用所谓的惰性气体法对固化炉各区域燃烧产生的情绪性废气进行循环加热,使炉内空气中的氧含量低于爆炸极限。一般来说,氧含量的控制水平也分为3个水平(3%、4.5%和6%)。防爆控制装置工作时,抽取(取样)少量炉气进行氧含量分析。当氧含量达到3%时,控制装置将发送信号到情绪气体开关,立即喷射人体惰性气体并报警直到氧含量正常。.当氧气含量达到4.5%时,喷惰性气体时,自动打开辊涂机机头,停止喷涂。当含氧量达到6%时,全线紧急停车,并向炉内注入大量惰性气体对炉内进行清洗。这种控制方法一般用于感应加热固化炉,要求正压操作。
此外,在采取上述防爆措施的基础上。同时要求在彩涂板固化炉上安装必要的防爆泄压装置,作为发生爆炸时的安全措施,将危害降到最低。

When the steel strip is dried and cured in the curing furnace after coating, most of the organic solvents in the coating film will evaporate gradually. When the solvent volatiles in the coatings are mixed with air at the furnace temperature of 150-450 (?) C, fire and explosion may occur, which is extremely dangerous.

When the solvent volatile mixes with air, the oblique zone is the explosion zone. According to the conditions of explosion, there are two main measures to prevent fire and explosion:
(1) Controlling the content of organic solvent 20 in the atmosphere of the curing furnace of color coated sheet to make it below 1/4, 1/6 or even 1/8 of the lower explosion limit, generally using 1/4 of the lower explosion limit (i.e. 25% IEL). Alarm concentration generally sets three alarm levels and takes different measures to prevent explosion: when the concentration of organic solvents reaches 25% LEL, the system will alarm and automatically start the accident air supply fan; when the concentration of organic solvents reaches 35% LEL, the roller coating machine will automatically stop coating operation; when the concentration of organic solvents reaches 50% LE. At L, the whole line should be stopped urgently. This control method is generally used in hot air circulating curing furnace and far infrared heating curing furnace. The operation of curing furnace requires negative pressure operation.
(2) To control the oxygen content in the curing furnace of color coated sheet, the so-called inert gas method is adopted to circulate and heat the emotional exhaust gas generated by combustion in all areas of the curing furnace, so that the oxygen content in the atmosphere of the furnace is below the explosion limit. Generally, the control level of oxygen content is also divided into three levels (3%, 4.5% and 6%). When the explosion-proof control device works, a small amount of furnace gas is extracted (sampled) for oxygen content analysis. When the oxygen content reaches 3%, the control device will send a signal to the emotional gas switch, immediately spray human inert gas and alarm until the oxygen content is normal. 。 When the oxygen content reaches 4.5%, when spraying inert gas, the head of the roller coating machine is opened automatically and the coating is stopped. When the oxygen content reaches 6%, the whole line stops urgently and a large number of inert gases are injected into the furnace to wash the furnace. This control method is generally used in induction heating curing furnace, which requires positive pressure operation.
In addition, on the basis of adopting the above explosion-proof measures. It is also required to install necessary explosion-proof and pressure relief devices on the curing furnace of color coated sheet as a safety measure when explosion occurs, so as to minimize the hazards.
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