关键词: 连续重整, 芳烃抽提, 脱庚烷塔, Aspen HYSYS, 热载体炉, 操作条件, 物料平衡效益核算

Abstract:

After the expansion, upgrading and renovation of a certain company, in order to ensure the hydrogen supply of a hydrogen system with a maximum capacity of 1.8 MPa, it is required that the reforming unit must operate at full load, highlighting the load mismatch problem between the existing process reforming unit and the aromatics extraction unit. To completely solve the mismatch problem between extraction and reforming units, a plan is proposed after analysis to add a new deheptane tower before increasing xylene unit after the de-heavy oil tower. Using Aspen HYSYS simulation software, the load, feedstock properties, material parameters, and product situation of the heat carrier system after the operation of the deheptane tower are simulated. The benefits are compared with the full load operation plan of the reforming unit without a deheptane tower. It is found that the addition of a deheptane tower resulted in better benefits, with a total benefit increase of 3 414 yuan per hour and an annual benefit of 28 million yuan. Based on this as a theoretical basis, a comparison is made between the actual situation before and after adding the deheptane tower, and it is found that although the optimized unit does not achieve the theoretical optimal operating conditions, the economic benefits and operational flexibility are improved. This method has certain guiding significance for the evaluation of the benefits of new units.

Key words: continuous reforming, aromatic extraction, deheptane tower, Aspen HYSYS, heat carrier furnace, operation condition, material balance, benefit accounting