Utilizing The Low-temperature Used Heat Of The Second Set Of Atmospheric And Vacuum Distillation, Lanzhou Petrochemical Company

Since the reconstruction of energy expansion in the second set of atmospheric and vacuum distillation, petroleum refinery, Lanzhou Petrochemical Company in 1997, due to the host equipments haven't been replaced and crude oil turns light steadily and so on, the expenditure of energy always maintains between 12.0kgEo/t and 12.5kgEo/t, and is difficult to improve. Such makes the set of equipment great amounts of energy expenditure and hard to gain up to par. Furthermore, it has threatened the safety production of equipments that a little higher overhead pressure of primary tower and atmospheric column. In order to solve the production bottleneck, aiming at the second set of atmospheric and vacuum distillation unit, this article introduces pinch technology and analyses multifold projects about utilizing the low-temperature used heat of equipments, and bring forward partial reconstruction project of heat exchanger network and carry through flexibility analysis and benefit estimate, such turns out to be feasible and necessary for the equipments to utilize low-temperature used heat, and significant instruction for practical process production and running. The main points are as follows:Firstly, using pinch technology, aiming at the practical conditions of the equipment, the resolvents of goods flow phase shift are put forward, and the matching system range of goods flow is choosed. The pinch analysis is applied to current heat exchange network using the recent system rating data of the equipment. We find out the best part of equipment energy consumption is low-temperature used heat system. By checking and calculation, we advance several suggestions for reasonable heat exchange between the goods flow in the system and some feasible reconstruction schemes of heat exchange network. Such shows we can reduce the quantity of cool-heat utilities greatly and make the energy expenditure drop to 1.89kgEo/t, and at the same time resolve the production bottleneck.Secondly, the economic effectiveness analysis is used to the reconstruction projects of heat exchange network. The results are based on fully utilizing current equipments,personnel and soil, saving energy sources, recycling used heat, and improving the integral economic effectiveness. The conclusion indicates the projects can greatly reduce equipment energy expenditure and save operating cost, the capital pay-off time is also short.