论文部分内容阅读
强化氨卧式壳管式冷凝器中氨的冷凝换热,可以降低冷凝器的金属耗量或提高其传热量,因此可取得很大的经济效果。强化氨在水平管簇上冷凝时换热的方法之一是管外绕线进行肋化。氨在这管子上冷凝时,冷凝液被拉向金属线,此时在大部份管子表面上的液膜变薄,因而使平均放热系数增加。为了对氨在水平管簇上的冷凝进行试验研究,安装了一个试验台。试验台的系统图见图1。氨蒸气由电锅炉1进入试验冷凝器6,监在水平管簇外表面冷凝。冷凝液在容器3中测量容积后靠自重流回电锅炉1。为了对电锅炉充液,试验台装有氨瓶2。从热网来的热水与冷的自来水在水槽7内混合,使冷却水达到要求的温度。水槽7的水位用溢流管保持一定。连通管8用橡皮管与传热管相连,使冷却水流入传热管。管簇中
Reinforced ammonia shell and tube condenser ammonia condensation heat transfer, condenser can reduce the metal consumption or increase its heat transfer, it can achieve great economic results. One of the ways to enhance heat transfer when ammonia is condensed on a horizontal tube cluster is to pipe the outer winding for ribification. When ammonia condenses on this tube, the condensate is drawn towards the wire, whereupon the liquid film on most of the tube surface becomes thinner, thereby increasing the average exothermic coefficient. To test the condensation of ammonia on horizontal tubes, a test bench was installed. The system test chart is shown in Figure 1. Ammonia vapor enters the test condenser 6 from the electric boiler 1 and is monitored for condensation on the outer surface of the horizontal tube cluster. The condensate flows back to the electric boiler 1 by gravity after measuring the volume in the container 3. In order to charge the electric boiler, the test bed is equipped with ammonia bottle 2. The hot water from the heat net is mixed with cold tap water in the water tank 7 to bring the cooling water to the desired temperature. The water level of the tank 7 is kept constant by the overflow pipe. The communicating pipe 8 is connected with the heat transfer pipe by a rubber tube so that the cooling water flows into the heat transfer pipe. Tube cluster