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IH20 Art.Nr. 240-00017

IH20 Art.Nr. 240-00017

IH20 Art.Nr. 240-00017

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福建光沃自動(dòng)化設(shè)備有限公司       
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信用=財(cái)富  誠信=財(cái)富  共贏=財(cái)富

 凈化水場(chǎng)破壞器部分是所有配套系統(tǒng)的龍頭部分，它的作用是利用少量的電功率將給定流量的含載臭氧的空氣從0℃加熱到350℃，以便在該空氣排放到大氣層之前破壞其臭氧層。從蓄水池引入的含臭氧的空氣引入換熱器A點(diǎn)的端部加熱，所引入的空氣跨過換熱器的初級(jí)電路并通過次級(jí)電路進(jìn)行加熱。當(dāng)該空氣離開B時(shí)，其溫度大約可達(dá)到300℃。進(jìn)入加熱器的C，并保持在D點(diǎn)處于預(yù)設(shè)定的溫度，最后通過次級(jí)電路E和F之間，并通過初級(jí)電路對(duì)其進(jìn)行冷卻�？諝庠跍囟�40~50℃之間離開熱破壞器，通過風(fēng)扇吸收，然后排放到大氣。此系統(tǒng)是由溫度控制器來進(jìn)行溫度控制，溫度控制器一旦損壞，加熱器將不再加熱，整個(gè)破壞系統(tǒng)將停止。它會(huì)使臭氧發(fā)生器聯(lián)鎖動(dòng)作停止工作。

  原理圖如下所示：

  圖1 原 理 圖

  2 溫度控制系統(tǒng)

  在加熱出口管內(nèi)的溫度探頭（Pt100）產(chǎn)生一個(gè)信號(hào)，由P、I、D溫度控制器來接收，并將該輸出信號(hào)施加給一個(gè)三相分級(jí)器。即425S固態(tài)繼電器，P、I、D溫度顯示表輸出的信號(hào)，將分級(jí)器（425S固態(tài)繼電器）的硅管釋放到較大或較小范圍，從而將較大或較小電壓施加到熱電阻接線柱上，由此按著探頭測(cè)量的溫度來調(diào)節(jié)電功率。

  3改造方法

  選定PNA3B14—1ROA型多功能調(diào)節(jié)器進(jìn)行代替，按原有的工作原理?xiàng)l件進(jìn)行編程，其原理如下：

  當(dāng)溫度從0℃開始加溫時(shí)，儀表控制輸出最大值（即溫度與控制輸出成反比關(guān)系），溫度逐漸升高，當(dāng)溫度升到300℃時(shí)圖2中的J1繼電器的常開觸點(diǎn)閉合，其觸點(diǎn)替代原始圖即圖3中的 31、33 觸點(diǎn)，使KA1繼電器得點(diǎn)吸合，其觸點(diǎn)控制風(fēng)機(jī)的高速和低速運(yùn)轉(zhuǎn)的切換。替代原理圖（即圖2）中的J2繼電器，儀表加電就得電吸合，其閉合觸點(diǎn)替代原始圖（即圖3 ）中的  34、36的閉合點(diǎn)，其作用當(dāng)溫度超過設(shè)定溫度時(shí)，如：370℃閉合點(diǎn)斷開，切斷加熱源，起到保護(hù)作用。解決了原始圖中（即圖3）的兩對(duì)觸點(diǎn)。關(guān)鍵的問題是，替代的PNA3B14-1R0A型多功能調(diào)節(jié)器的輸出是4-20mA電流信號(hào)，而三相分級(jí)器即425S 固態(tài)繼電器其接收的是10V DC電壓信號(hào)，這是難點(diǎn)之一。在替代表輸出上并聯(lián)一個(gè)電阻，可轉(zhuǎn)換成電壓信號(hào)，但需并聯(lián)多大的電阻才能達(dá)到原有的工作要求，經(jīng)試驗(yàn)，在替代表輸出上并聯(lián)500Ω的電阻，可使輸出20mA時(shí)，電壓達(dá)到接近9V。難點(diǎn)之二，替代的 PNA3B14-1R0A，調(diào)

  節(jié)器溫度輸入的是電壓信號(hào)，而原表直接輸入電阻信號(hào)，經(jīng)實(shí)驗(yàn)在溫度變送器輸出端并接一250Ω的電阻即可解決。完全滿足原有的工作條件，反復(fù)調(diào)試替代儀表，完全穩(wěn)定的按原設(shè)計(jì)的要求進(jìn)行工作。

  圖2 破壞器溫度控制器替代儀表原理

  圖3 原始圖

  4 改造效果

  通過對(duì)破壞器溫度控制的改造，可使編程和操作簡單化，更直觀，更可靠，壽命比原裝表更長，從而使溫度控制系統(tǒng)具有高安全，更可靠的滿足系統(tǒng)自動(dòng)化的運(yùn)行要求，保證人們喝上放心的、達(dá)到國際標(biāo)準(zhǔn)的水。

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