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板式換熱器使用注意事項

發布者:xinadmin2  發布時間:2013-12-30  點擊:3141

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    板片型式或波紋式應根據換熱場合的實際需要而定。對流量大允許壓降小的情況,應選用阻力小的板型,反之選用阻力大的板型。根據流體壓力和溫度的情況,確定選擇可拆卸式,還是釬焊式。確定板型時不宜選擇單板面積太小的板片,以免板片數量過多,板間流速偏小,傳熱系數過低,對較大的換熱器更應注意這個問題。
    流程指板式換熱器內一種介質同一流動方向的一組并聯流道,而流道指板式換熱器內,相鄰兩板片組成的介質流動通道。一般情況下,將若干個流道按并聯或串聯的方式連接起來,以形成冷、熱介質通道的不同組合。
    流程組合形式應根據換熱和流體阻力計算,在滿足工藝條件要求下確定。盡量使冷、熱水流道內的對流換熱系數相等或接近,從而得到最佳的傳熱效果。因為在傳熱表面兩側對流換熱系數相等或接近時傳熱系數獲得較大值。雖然板式換熱器各板間流速不等,但在換熱和流體阻力計算時,仍以平均流速進行計算。由于“U”形單流程的接管都固定在壓緊板上,拆裝方便。
    在板式換熱器的設計選型使,一般對壓降有一定的要求,所以應對其進行校核。如果校核壓降超過允許壓降,需重新進行設計選型計算,直到滿足工藝要求為止。

板式換熱器

Plate type or corrugated type should be based on the actual needs of the heat exchange places.For large flow pressure drop allows small, should choose small resistance of the plate type, vice choose resistance of plate type.According to the fluid pressure and temperature, determine the removable type choice, or brazing type.Plate type is unfavorable choose veneer board piece area is too small, in order to avoid board piece of too many, small flow rate between plate, heat transfer coefficient is too low, for larger heat exchanger more attention should be paid to the problem.Process refers to a medium plate heat exchanger in a set of parallel flow, flow direction and flow within the dow plate heat exchanger, consisting of two adjacent plate medium flow channel.In general, several port connected in parallel or serial way, in order to form the different combination of cold and hot media channels.Process combination shall be computed according to the change of heat and fluid resistance, in satisfies the requirement of process conditions under the determined.Try to make the cold, hot water flow passage of convection heat transfer coefficient is equal or close to, to get the best heat transfer effect.Because the heat transfer surface on both sides of the convective heat transfer coefficient is equal or close to the heat transfer coefficient for larger values.Although velocity varies among different plate, plate heat exchanger in the change of heat and fluid resistance calculation, is still at an average velocity to calculate.Due to the "U" shape of the single process over all fixed on the pressure plate, tear open outfit is convenient.In design, selection of plate heat exchanger and generally have a request for the pressure drop, so deal with it to check.If check pressure drop exceeds allowed pressure drop, redesign to type selection calculation, until meet the technological requirements.

    
 
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