Supercritical rankine cycle power generation system with two transverse stages and one longitudinal stage

Abstract

The invention relates to a supercritical rankine cycle power generation system with two transverse stages and one longitudinal stage. The supercritical rankine cycle power generation system with two transverse stages and one longitudinal stage comprises an LNG circulation pump, a seawater pump, a first-stage power generation unit, a second-stage power generation unit and a third-stage power generation unit; the first-stage power generation unit and the second-stage power generation unit are transversely distributed in parallel; the first-stage power generation unit comprises a first-stage evaporator, a first-stage steam turbine, a first-stage condenser and a first-stage working medium pump which are sequentially connected with one another through a pipeline to form a closed loop; the second-stage power generation unit comprises a second-stage evaporator, a second-stage steam turbine, a second-stage condenser and a second-stage working medium pump which are sequentially connected with one another through a pipeline to form a closed loop; and the third-stage power generation unit is longitudinally distributed above the first-stage power generation unit and the second-stage power generation unit and comprises a third-stage evaporator, a third-stage steam turbine, a third-stage shunt, a third-stage mixer and a third-stage working medium pump. The supercritical rankine cycle power generation system has the advantages that by adopting an LNG cold energy to perform power generation, an LNG high-grade cold energy is effectively utilized, and energy consumption and water source consumption of an enterprise in the LNG gasification process are reduced.

Description

technical field [0001] The invention relates to the technical field of LNG cold energy power generation, in particular to a supercritical horizontal two-pole vertical one-stage Rankine cycle power generation system. Background technique [0002] LNG carries a large amount of low-temperature cold energy, which will cause a lot of waste if not utilized. As my country imports a large amount of natural gas, and most of the natural gas is transported to my country in the form of LNG, the economic value of LNG cold energy has become non-negligible. Therefore, rational and effective use of this part of cold energy can bring huge economic benefits. Using power cycle to convert cold energy into work is one of the forms of utilization of LNG cold energy. At the same time, among the many methods of recovering LNG cold energy at present, using LNG cold energy to generate electricity is the most widely used method. At present, the main schemes for utilizing LNG cold energy to generate ...

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Problems solved by technology

However, these two power generation schemes have a common disadvantage: the heat exchange between the working fluid and the cold source LNG also exchanges heat with the heat source seawater, which will cause a large temperature difference between the cold and hot streams in the working fluid evaporator, resulting in the The low exergy efficiency of the evaporator affects the net output power of the whole system

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