Techno-economic Analyses of Steam Differential Pressure Power Generation in Integrated Energy System

The cascade utilization of energy is an important subject of energy conservation research. This paper takes the gas-steam combined cycle as an object, A high-speed radial turbine steam differential pressure power generation system is proposed to replace the temperature and pressure reduction devices. Ebsilon is used to simulate and analyze the effect of temperature and pressure reduction scheme, steam differential pressure generation scheme and the influence of differential pressure generation on combined cycle unit performance. The steam differential pressure power generation system generate 382.81kW, the combined cycle unit load increased by 0.82%, resulting in an additional generation of 388.03 kW. Considering the power generation benefits of back pressure unit of the combined cycle, the cost will be recovered in 3.06 years; considering the benefits of differential pressure power generation only, the payback period is 3.75 years. The payback period can be reduced to 2.4 years for the user side steam pressure differential generation system, The work of this paper provides a theoretical reference for the application and promotion of steam pressure difference power generation technology in integrated energy system.

I. Introduction

With the increasing pressure of energy conservation and environmental protection, small-scale decentralized industrial boilers with low efficiency and high pollution are gradually replaced by centralized integrated energy systems. However, the mismatch of steam supply and demand causes a huge waste of energy. In order to create an energy-saving and environment-friendly society, it has become a difficult and hot point to recycle the huge differential pressure of steam and natural gas pipelines.