IH20 Art.Nr. 240-00017
IH20 Art.Nr. 240-00017
IH20 Art.Nr. 240-00017
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净化水场破坏器部分是所有配套系统的龙头部分，它的作用是利用少量的电功率将给定流量的含载臭氧的空气从0℃加热到350℃，以便在该空气排放到大气层之前破坏其臭氧层。从蓄水池引入的含臭氧的空气引入换热器A点的端部加热，所引入的空气跨过换热器的初级电路并通过次级电路进行加热。当该空气离开B时，其温度大约可达到300℃。进入加热器的C，并保持在D点处于预设定的温度，最后通过次级电路E和F之间，并通过初级电路对其进行冷却。空气在温度40~50℃之间离开热破坏器，通过风扇吸收，然后排放到大气。此系统是由温度控制器来进行温度控制，温度控制器一旦损坏，加热器将不再加热，整个破坏系统将停止。它会使臭氧发生器联锁动作停止工作。
原理图如下所示：
图1 原 理 图
2 温度控制系统
在加热出口管内的温度探头（Pt100）产生一个信号，由P、I、D温度控制器来接收，并将该输出信号施加给一个三相分级器。即425S固态继电器，P、I、D温度显示表输出的信号，将分级器（425S固态继电器）的硅管释放到较大或较小范围，从而将较大或较小电压施加到热电阻接线柱上，由此按着探头测量的温度来调节电功率。
3改造方法
选定PNA3B14—1ROA型多功能调节器进行代替，按原有的工作原理条件进行编程，其原理如下：
当温度从0℃开始加温时，仪表控制输出最大值（即温度与控制输出成反比关系），温度逐渐升高，当温度升到300℃时图2中的J1继电器的常开触点闭合，其触点替代原始图即图3中的 31、33 触点，使KA1继电器得点吸合，其触点控制风机的高速和低速运转的切换。替代原理图（即图2）中的J2继电器，仪表加电就得电吸合，其闭合触点替代原始图（即图3 ）中的 34、36的闭合点，其作用当温度超过设定温度时，如：370℃闭合点断开，切断加热源，起到保护作用。解决了原始图中（即图3）的两对触点。关键的问题是，替代的PNA3B14-1R0A型多功能调节器的输出是4-20mA电流信号，而三相分级器即425S 固态继电器其接收的是10V DC电压信号，这是难点之一。在替代表输出上并联一个电阻，可转换成电压信号，但需并联多大的电阻才能达到原有的工作要求，经试验，在替代表输出上并联500Ω的电阻，可使输出20mA时，电压达到接近9V。难点之二，替代的 PNA3B14-1R0A，调
节器温度输入的是电压信号，而原表直接输入电阻信号，经实验在温度变送器输出端并接一250Ω的电阻即可解决。完全满足原有的工作条件，反复调试替代仪表，完全稳定的按原设计的要求进行工作。
图2 破坏器温度控制器替代仪表原理
图3 原始图
4 改造效果
通过对破坏器温度控制的改造，可使编程和操作简单化，更直观，更可靠，寿命比原装表更长，从而使温度控制系统具有高安全，更可靠的满足系统自动化的运行要求，保证人们喝上放心的、达到国际标准的水。
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