Reconstruction Design Of Synthesizing Ammonia Second Stage Heat-recovering Heat Exchanger And Heat Transfer Enhancement Study

The process gas of the Synthesizing Ammonia Technology has extremely high energy, which will result in enormous waste of energy. Aiming at the reconstruction design of the synthesizing ammonia technology second stage heat-recovering heat exchanger, the heat transfer enhancement of the heat exchanger was deeply researched, which can be listed as follows:(1) The research status of heat recover and heat transfer enhancement was introduced and the merits and demerits of different heat transfer enhancement technology was discussed exhaustively.(2) The thermodynamic model and technological calculation method of both the plain tube and the GEWA-T tube heat exchanger were proposed. The heat transfer calculation results show that the tube inside heat transfer coefficient of the GEWA-T tube is 1.22 times bigger than it of the plain tube. The tube outside boiling heat transfer coefficient and the overall heat transfer coefficient are respectively 1.24 and 1.6 times bigger than the plain tube. The heat transfer area of the reconstruction heat exchanger is smaller than before.(3) The vibration analysis of the heat exchanger was completed using the appendix E of the GB151. The results show that the heat exchanger will not vibrate during the working process. The modified heat exchanger has a better anti-vibration property than the original equipment.(4) The FLUENT software was induced to simulate the boiling heat transfer performance of the GEWA-T tube and the plain tube. The boiling heat transfer enhancement mechanism of the GEWA-T tube was illustrated in detail. The heat transfer coefficient of the GEWA-T tube is about 23.2% bigger than the plain tube. The comprehensive performance factor of the GEWA-T tube is bigger than 1, which means that the GEWA-T tube has a better tube outside boiling heat transfer performance than the plain tube.