جستجوی مقالات مرتبط با کلیدواژه « فن آوری پینچ » در نشریات گروه « برق »

Retrofit design of heat exchanger networks using Pinch technology is mainly applied for two reasons; improvement of a network for energy saving as well as improvement of a network with new flow rate in its process streams. The latter is called Retrofit for Debottlenecking of the Heat exchanger Network. All networks about which retrofit design have been studied so far follow methods rather than those in pinch technology. Regarding changes in process industries to respond to market design, factories have to expand their throughput, so pinch technology as a strong tool can be used in such situations, as there would be new changes in process structure along with undesired restrictions. It, also, can be true for networks the grassroots design of which was based on pinch technology for a premier throughput. In this research, we considered a heat exchanger network designed using Pinch Technology Method whose throughput is going to increase. After investigating the conditions of the network and predicting what changes would happen, the optimum method was introduced to target the final results of the design step in a way that not only network restrictions will be overcome, but also will network be able to work with the economical conditions. Finally, a case study of an Aromatic plant was applied to illustrate targeting and design step results. These results verify the proposed method of Pinch Technology in the retrofit design for debottlenecking of heat exchanger networks designed by PDM.

Process integration technology is now widely used in both energy saving retrofits and plant debottlenecks (due to increase throughput or modifications of process). It has been used in a variety of industries and approved to be reliable and application in engineering design. The main objective of this research is to find a methodology for retrofitting of an existing network for debottlenecking, using pinch technology. Debottlenecking may apply to a specific part of the unit or the entire unit. The most advanced method for debottlenecking, which is currently used, is based upon fixed-allowable pressure drops, in which a retrofit can be achieved without a need for pump and/ or compressor replacement. However, the existing algorithms do not consider optimum-pressure drops for the process streams; hence it may cause the following problems. 1. Capital investment for new exchangers would not be optimum. 2. Operating cost of the network tends to be sub-optimum. 3. Wrong targeting results causes wrong design initialization and hence wrong network topology. This work is going to resolve the above problems, by suggesting a new procedure for pressure drop optimization in debottlenecking. Application of the new procedure has made it possible to study pump and/ or compressor replacement towards optimum values for additional area, as well as operating cost of the network. This means a three-way trade-off among cost of additional area, pumps and compressors investment, and reduction or increase of electricity cost. The new algorithm has been effectively applied to a Crude Oil Pre-heat Train, subject to some 20% increase in throughput, and the corresponding results proved to be accurate enough. Namely, the results of targeting stage showed a very good agreement with final detailed design.