Study On Parallel Connection Device In Large-scale Vertical Radial Flow Adsorber

With the rapid development of world economy, the demand for industrial gas in steel, chemical and many other industries is rising sharply. Larger-scale and higher-performance are significant for a future air separation unit. The adsorption progress is very important for the safety of whole system in a cryogenic air separation unit. It is one of the biggest problems to block the large-scale and low energy consumption evolution that how to improve the treatment capacity and coefficient of adsorbents utilization of an adesorber. However, the vertical radial flow adsorber has lower bed pressure drop, needs less floor area and thus widely used in the large-scale even super large-scale cryogenic air separation industry in recent years. Therefore one of the available methods for the above problem is to ameliorate the structure of the existing vertical radial flow adsorber and optimize the internal flow distribution. And the following several works of this paper have done based on this thought:(1) In order to reduce the non-uniformity of the flow distribution caused by the excessive high bed, a new kind of parallel connection device was presented. We designed and made the experimental apparatus of parallel connection device, and measured the static pressure distribution of the internal flow.(2) A mathematical model of the parallel connection vertical radial flow adsorber is established to simulate the flow field in the adsorption bed, and the characteristics of the pressure drop and the radial velocity profiles are obtained. In addition, this flow distribution of the vertical radial flow adsorber is compared with the one using normal type structure under the same bed height. It is shown that the non-uniformity of radial static pressure drop and the energy of passing through the bed are reduced significantly by using the parallel connection device. The revamped adsorber can maintain a high level of uniformity in the adsorption bed and avoid the influence of excessive height.(3) Then we optimized several structure parameters of the parallel connection device to make it work better. And how to associate this new device with other traditional uniformity distribution methods was also discussed in the end of the paper.