convection tubes 中文意思是什麼
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Abstract : the in servie tubular heaters built early in refineries and chemical plans have low thermal load and low heat efficiency, therefore measures for technical reform are offered, including ( 1 ) enlarging the surface area of convection tubes to increase the thermal load of rhe convection section ; ( 2 ) increasign the heat interchanging area of radiant tubes ; ( 3 ) changing the height of the chimney ; ( 4 ) using new burner with forced air supply to increase calorific capacityu ; ( 5 ) adding air preheater between the convection section and chimney to enhence the temperature of the air entering the furnace ; ( 6 ) adopting high temperature radiant coating to improve the effect of radiant heat interchanging
文摘:針對早期建造的煉油廠和化工廠在役管式加熱爐熱負荷和熱效率低的狀況，提出了若干技術改造措施包括，增大對流管表面積以增大對流段的熱負荷；增加輻射管的換熱面積；修正煙囪高度；換用新型燃燒器，變自然通風為強制供風，以增大燃燒器的發熱量，減小過剩空氣系數，節省燃料2 % 3 % ；在對流段和煙囪之間增設空氣預熱器以提高空氣入爐溫度；採用高溫輻射塗料增強輻射換熱效果，從而增加熱源對爐壁的輻射傳熱量和爐管的傳熱量等。 -
The in servie tubular heaters built early in refineries and chemical plans have low thermal load and low heat efficiency, therefore measures for technical reform are offered, including ( 1 ) enlarging the surface area of convection tubes to increase the thermal load of rhe convection section ; ( 2 ) increasign the heat interchanging area of radiant tubes ; ( 3 ) changing the height of the chimney ; ( 4 ) using new burner with forced air supply to increase calorific capacityu ; ( 5 ) adding air preheater between the convection section and chimney to enhence the temperature of the air entering the furnace ; ( 6 ) adopting high temperature radiant coating to improve the effect of radiant heat interchanging
針對早期建造的煉油廠和化工廠在役管式加熱爐熱負荷和熱效率低的狀況，提出了若干技術改造措施包括，增大對流管表面積以增大對流段的熱負荷；增加輻射管的換熱面積；修正煙囪高度；換用新型燃燒器，變自然通風為強制供風，以增大燃燒器的發熱量，減小過剩空氣系數，節省燃料2 % 3 % ；在對流段和煙囪之間增設空氣預熱器以提高空氣入爐溫度；採用高溫輻射塗料增強輻射換熱效果，從而增加熱源對爐壁的輻射傳熱量和爐管的傳熱量等。 -
Natural convection boiling heat transfer in enhanced heat transfer tubes
強化傳熱管內的自然對流沸騰換熱 -
Secondly, the temperature distribution in rib - tube heat exchanger in the course of heat transfer is programed and simulated using apdl language of fem software ansys, and the average convection coefficient of both sides is obtained. the rib - tubes with different structure are also simulated and optimized on the base of the calculated results, the relationship between structure and the average convection coefficient of both sides is summrized. the rib - tube structure is optimized using apdl. finally, combines numerical simulation with experimental research, and results of numerical simulation are found to be close to the experimental data
利用ansys有限元程序對翅片管換熱器的換熱過程進行數值模擬，確定了換熱過程中翅片管的溫度場和熱流量梯度分佈狀況，對翅片管換熱器的多組分流場進行計算，給出了逆流和順流兩種情形下翅片管結構參數對換熱效果的影響規律，並利用ansys提供的優化技術編寫程序對翅片管進行結構優化設計，為其今後在工業中的設計及使用提供了重要依據。
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