最近幾(ji)年，由(you)于社會經濟不斷發展，各種各樣的(de)(de)新事物(wu)開始出現在我(wo)們的(de)(de)身邊(bian)。說起換(huan)熱(re)器，我(wo)們大(da)家(jia)應(ying)該都不陌生。實際上，換(huan)熱(re)器是一種實現物(wu)料(liao)之間熱(re)量交換(huan)的(de)(de)節能設備(bei)，它廣泛(fan)應(ying)用于國民經濟的(de)(de)各個(ge)領域。在生產中為了(le)防止腐蝕和(he)污染，以及滿足工藝流程(cheng)、勞動保(bao)護、安全生產等方面(mian)的(de)(de)要求，通常采用雙(shuang)管板換(huan)熱(re)器來解決(jue)。下面(mian)就一起來看(kan)看(kan)雙(shuang)管板換(huan)熱(re)器有哪(na)些結構(gou)。
雙(shuang)管(guan)(guan)板(ban)(ban)(ban)換(huan)熱器采(cai)用(yong)固(gu)定管(guan)(guan)板(ban)(ban)(ban)結構，管(guan)(guan)束不能抽出清(qing)洗，這是與單管(guan)(guan)板(ban)(ban)(ban)換(huan)熱器可(ke)采(cai)用(yong)多種(zhong)結構型式(shi)、管(guan)(guan)束可(ke)以抽出清(qing)洗不同(tong)的地方(fang)。對于溫差較大的雙(shuang)管(guan)(guan)板(ban)(ban)(ban)換(huan)熱器，筒體(ti)上(shang)可(ke)加裝波紋膨脹節(jie)(jie);而單管(guan)(guan)板(ban)(ban)(ban)換(huan)熱器除可(ke)考慮筒體(ti)上(shang)加裝波紋膨脹節(jie)(jie)外，常采(cai)用(yong)浮頭(tou)或(huo)U型管(guan)(guan)型式(shi)來(lai)補(bu)償(chang)。
對于(yu)雙管(guan)(guan)(guan)板(ban)(ban)(ban)換熱器，存在兩種設計理念的(de)認識：一(yi)種認為雙管(guan)(guan)(guan)板(ban)(ban)(ban)換熱器用(yong)于(yu)絕對防止管(guan)(guan)(guan)殼程間(jian)介(jie)質(zhi)混串的(de)場合，設計在內外(wai)管(guan)(guan)(guan)板(ban)(ban)(ban)之間(jian)空腔上加(jia)裝(zhuang)排液倒淋閥，供日常觀察和內管(guan)(guan)(guan)板(ban)(ban)(ban)發生泄漏時(shi)排放，使得管(guan)(guan)(guan)殼程介(jie)質(zhi)切(qie)實被內外(wai)二層管(guan)(guan)(guan)板(ban)(ban)(ban)隔離。這是采用(yong)雙管(guan)(guan)(guan)板(ban)(ban)(ban)結(jie)構(gou)型式的(de)主要目的(de)。
另一種認為雙(shuang)管(guan)(guan)板(ban)(ban)(ban)換(huan)熱器可用于(yu)管(guan)(guan)殼程(cheng)間(jian)介(jie)質(zhi)壓(ya)(ya)差(cha)很大的場合，設計在內外管(guan)(guan)板(ban)(ban)(ban)之間(jian)的空腔中(zhong)加入一種介(jie)質(zhi)，來減小管(guan)(guan)殼程(cheng)間(jian)介(jie)質(zhi)的壓(ya)(ya)差(cha)。這和一般單(dan)管(guan)(guan)板(ban)(ban)(ban)換(huan)熱器一樣，不(bu)能絕對保證外管(guan)(guan)板(ban)(ban)(ban)上管(guan)(guan)口(kou)不(bu)發生泄漏。雙(shuang)管(guan)(guan)板(ban)(ban)(ban)之間(jian)的隔離(li)腔是(shi)與(yu)單(dan)管(guan)(guan)板(ban)(ban)(ban)換(huan)熱器結構主要(yao)區別(bie)之處(見圖1)，該隔離(li)腔不(bu)與(yu)管(guan)(guan)程(cheng)、殼程(cheng)相連通，不(bu)承受介(jie)質(zhi)壓(ya)(ya)力，但承受設備(bei)的機械載(zai)荷(he)與(yu)熱載(zai)荷(he)。隔離(li)腔的承載(zai)能力主要(yao)取決于(yu)雙(shuang)管(guan)(guan)板(ban)(ban)(ban)間(jian)距(ju)。對固定(ding)式雙(shuang)管(guan)(guan)板(ban)(ban)(ban)進行(xing)殼程(cheng)水壓(ya)(ya)試驗時，內側管(guan)(guan)板(ban)(ban)(ban)與(yu)換(huan)熱管(guan)(guan)連接處可能存(cun)在泄漏，故在確定(ding)雙(shuang)管(guan)(guan)板(ban)(ban)(ban)間(jian)距(ju)時必須考慮(lv)觀(guan)察(cha)、檢漏所需要(yao)的最小空間(jian)。
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