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首頁 > 回收方式優缺點對比

到底用什么方式對冷凝水進行回收利用是一個大家一直爭論的問題,問題的焦點主要集中在兩個方面:
1.用何種形式的回收泵,電泵還是機械泵?
2.用何種回收系統,開式回收系統還是閉式回收系統?
■機械泵在泵送高溫流體時沒有氣蝕現象。
■機械泵可以在任何工況下,包括設備內產生真空時,都能從設備中排除和回收冷凝水。
■機械泵無需電力,使用蒸汽或壓縮空氣作為能源,能耗少,適用于危險、潮濕的環境。
■電泵揚程較機械泵高,罐體較機械泵大,熱量損失也較大。

  很多人認為,冷凝水回收系統采用閉式回收會更加節能,因為它沒有二次蒸汽損失,表面上看上去更加美觀合理,我們不否認這一點,但我們認為在對冷凝水回收過程中必須兼顧前端換熱設備的有效排水問題。因為對于閉式系統,一個無法解決的問題就是疏水閥的背壓問題,如果整個回收系統的壓力定位為1bar,那么即使冷凝水管道沒有任何提升,所有的蒸汽疏水閥后都會至少有1bar的背壓,對于前端給定的蒸汽壓力,相比同樣布置的開式回收系統,疏水閥的有效工作壓差至少要減少1bar,設備上所有選型時必須考慮壓差的減小,甚至部分疏水閥必須選擇更大的口徑,增加設備的初投資。更重要的是,一旦閉式系統中某個疏水閥或旁通閥發生泄漏故障,閉式系統的背壓會更加提高,從而影響其它疏水閥,使其無法正常工作,系統的可靠性很差。

  實際應用中,疏水閥后背壓越高,疏水閥的工作可靠性就越差,特別是對于換熱器負荷時常變化的場合,這種現象尤為明顯(詳見換熱器失流技術文獻),有時會出現啟動速度慢,加熱效率低,無法達到加熱問題,系統振蕩,水錘腐蝕冰凍現象。

  因此,閉式系統的可靠性相比開式系統而言較差,換熱設備和疏水閥的工作更容易受到影響。因此從兼顧系統可靠性和能源節約的角度而言,開式冷凝水回收系統更加適合大部分的蒸汽系統,蒸汽系統更加可靠,而且前端一旦發生泄漏問題就會被發現,閉式系統很難滿足這樣的要求。

  在蒸汽系統中,冷凝水所具有的巨大潛能是顯而易見的。通過采用合適的方式對冷凝水進行有效回收利用,不僅可以節約能源,而且不會影響蒸汽系統其它設備的工作

目前市場上應用的三種回收裝置優缺點對比:


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