Study And Design Of Heat Exchanger And The Develop Of Its Design Software In IGCC Demonstration Project

IGCC is considered as one of the promising clean coal power generation technology and win great attention since the seventies of the last century. IGCC technology is used in power generation and poly-generation with the advantage of high efficiency and environmentally friendly. In the IGCC system, there is a lot of heat in the syngas at the outlet of coal gasifier and the extract air of gas compressor, which is of high temperature.The syngas in the heat regenerator system is composed of CH₄, CO₂, N₂, H₂, H₂O, CO, H₂S, COS, Ar and NH₃. The system work under the pressure of 1.14-10 MPa and the temperature of 35-355℃, which demand high standard design. With the support of state 863 project which focuses on study and design of heat regenerator in IGCC, This thesis studied the following aspects: 1. The relation between syngas cooler, clean syngas superheater and air cooler is studied. And the overall design of the system is accomplished.2. The basic design philosophy and method for multicomponent, high pressure heat exchanger is studied and proposed. And, the design of syngas cooler, clean syngas superheater and air cooler in the heat regenerator system is finished on the ASPEN HTFS+ platform.3. Baseing on the design philosophy and method for multicomponent, high pressure heat exchanger, check computation is done on syngas cooler, clean syngas superheater and air cooler in the heat regenerator system, which is designed by China Tianchen Engineering Corporation. The Check result indicate that the design of syngas cooler and air cooler meet the demand, while heat exchange area of the clean syngas superheater is overlarge althought it still can finish the productive task. Decreasing 25% to 30% of heat exchange area of the clean syngas superheater is suggested.4. Basing on the study results on design philosophy and method for multicomponent, high pressure heat exchanger, design software is developed for the heat exchanger in the IGCC regenerator system. The software is a convenient tool for the further study and design of multicomponent, high pressure heat regenerator.