Tube-wound heat exchanger is one of the key equipment in continuous reformer, and the effect of gas-liquid mixing between naphtha and hydrogen will affect the degree of crystallization and blockage in the tube. At present, the in-service reforming tube-wound heat exchanger is unevenly mixed with gas and liquid, and the crystallization and blockage in the tubes cause problems such as increased pressure drop in the tubes and poor heat transfer efficiency. In this paper, on the basis of the original structure of the heat exchanger gas-liquid mixing hole injection method, the nozzle structure atomization method is introduced for gas-liquid material mixing, and the gas-liquid mixing effect of the two structures are compared. By means of CFD numerical analysis, the influence of different structures on the gas-liquid mixing effect was comparatively studied. The results show that the gas-liquid mixing effect of the horizontal nozzle is better than that of the round hole structure, and the larger the nozzle facing angle, the worse the gas-liquid homogeneity is, and the relevant results can provide certain guidance for the overall optimization of the continuous reforming device.
The ultra-high pressure polyethylene tubular reactor requires an casing heat exchanger because of the high temperature in the working process. Instead of using welding to connect the inner and outer tubes, ultra-high pressure tubular reactors are usually connected by means of the shrinking fit. The shrinking fit is essentially an interference fit connection, and the theoretical calculation uses the method of calculating the amount of interference. However, due to the high and temperature that the shrinking fit is subjected to, the theoretical calculation results have a large differences with the actual. This paper identifies the problems existing in the theoretical calculations by numerical simulations and finds out the specific differences between the actual situation and the theoretical calculations. This lays the theoretical foundation for the optimization of the shrinking fit of the ultra-high pressure tubular reactor.
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