A novel solution of three-stage waste heat recovery from a gas turbine (11.35 MW) is proposed and its dynamic response characteristics with a series of load and environment change in the process of gas turbine operation is studied according to actual process requirements on an offshore platform. Integrating three processes under different temperature ranges is performed by using the flue gas to heat oil, generate steam and heat rejection water in turn with three heat exchangers (HE I, HE II and HE III), respectively. The dynamic simulation results show that the steam flow rate in HE II has obvious fluctuations as gas turbine load drops. Within the 10%, 20%, and 30% load decrease of gas turbine, the stabilized values of steam mass flow rate decrease by 7.6%, 16.3%, and 26.5%, respectively. The greater varying rate of the gas turbine load can accelerate the response speed but deteriorates system stability. The environment temperature change from 5 °C to 25 °C essentially affects the flue gas temperature from 473.18 °C to 496.70 °C, and it influences the system response linearly to a certain extent for the non-linear system expect for HE II. Since the phase transition process exists in HE II and the gas residence time is much shorter than liquid, the response speed and trend is different from the process in HE I and HE III.

提出了一种新型燃气轮机（11.35 MW）余热回收方案，并根据海上实际工艺要求，研究其在燃气轮机运行过程中随一系列负载和环境变化的动态响应特性。平台。将不同温度范围下的三个过程集成在一起，分别通过三个换热器（HE I，HE II和HE III）利用烟气加热油，产生蒸汽和排热水。动态模拟结果表明，随着燃气轮机负荷的下降，HE II中的蒸汽流量有明显的波动。在燃气轮机负荷下降10%、20%和30%范围内，蒸汽质量流量稳定值分别下降7.6%、16.3%和26.5%。较大的燃气轮机负载变化率可以加快响应速度，但会降低系统稳定性。环境温度从 5 °C 到 25 °C 的变化本质上影响了烟气温度从 473.18 °C 到 496.70 °C，并且对于除 HE II 以外的非线性系统，它在一定程度上线性地影响了系统响应。由于HE II中存在相变过程，气体停留时间比液体短得多，因此响应速度和趋势与HE I和HE III中的过程不同。