STUDY OF BLENDING PROCESS AND HYDROGEN RATIO FOR THE HYDROGEN BLENDING DEVICE IN THE TANK ON THE PIPELINE OPERATION PARAMETERS BY FLUENT SIMULATIONS

Due to the physical property differences between the hydrogen and natural gas, the gas conditions in the pipelines will be changed when the hydrogen is blended into the natural gas pipeline networks. The degree of blending uniformity and the hydrogen ratio will have different effects on the performance of pipelines and equipment. The storage tank is the most common component in the gas pipeline. Based on the storage tank, this paper proposes two hydrogen blending schemes: the single-pipe staged hydrogen blending scheme and multi-pipe multi-manifold single-time hydrogen blending scheme. The FLUENT software are used for dynamic simulation of blending process. The results show that the single-pipe staged hydrogen blending scheme can achieve better blending effect than multi-pipe multi-manifold single-time hydrogen blending scheme. In order to study the influence of different hydrogen blending ratio through single-tube single-manifold storage tank and the above two hydrogen blending schemes on pipeline operation, this paper uses HYSYS software to establish corresponding models for process simulation. The results show that the tank pressure of the three schemes is sorted as follows: multi-pipe multi-manifold single-time hydrogen blending>single-pipe single-manifold hydrogen blending>single-pipe staged hydrogen blending; in addition, with the increase of hydrogen ratio, the pipeline pressure and temperature increase, while the pressure drop and temperature drop. In general, the hydrogen blending scheme based on storage tank proposed in this paper has the advantages of simple structure, convenient processing, low cost, relatively good blending effect and hydrogen blending ratio adaptability. In addition, the results of HYSYS process simulation under different hydrogen ratios are also useful for the operation analysis of hydrogen blending pipelines.