Overlapped organic rankine cycle efficient heat machine

Abstract

The invention discloses an overlapped organic rankine cycle efficient heat machine which solves the problem that a single-stage organic rankine cycle expansion machine component is oversize in expansion ratio and achieves purposes of reducing expansion ratio through two-stage expansion, improving safety and durability of operation of an expansion machine and simultaneously improving efficiency of the heat machine. The organic rankine cycle efficient heat machine is mainly composed of a residue temperature heat source system (comprising renewable energy sources such as solar thermal power, various industrial waste heat, terrestrial heat, biomass energy, ocean thermal gradient and the like), a working medium pump, a cooling water system, a heat exchanger (respectively serving as an evaporator and a condenser on an evaporation side and a condensation side) and the expansion machine. The overlapped organic rankine cycle efficient heat machine is based on organic rankine cycle, uses the high-low-two-stage expansion machine, and uses superheated steam coming from the evaporator to drive the expansion machine to have expansion work to push a generator to generate electricity. Reclamation of energy is achieved on one hand, environmental protection can be favorably achieved on the other hand, and the overlapped organic rankine cycle efficient heat machine has good practical applicability and economical efficiency.

Description

technical field [0001] The present invention relates to a cascade organic rankine cycle high-efficiency heat engine, in particular to a power cycle that utilizes medium and low grade heat energy to drive an expander to generate electricity through a cascade organic rankine cycle, and is applied to utilize abundant medium and low grade heat energy (including Solar thermal energy, various industrial waste heat, geothermal energy, biomass energy, ocean temperature difference and other renewable energy) are used to generate power, achieving the purpose of making full use of waste heat and energy saving and emission reduction. Background technique [0002] With the rapid development of our country's economy and the continuous growth of population, the consumption of fossil energy such as coal and oil continues to rise, and the contradiction of relative energy shortage has become increasingly prominent. At the same time, environmental burdens (such as carbon dioxide emissions, etc....

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Problems solved by technology

[0008] At the same time, the present invention can transfer the heat to the organic Rankine cycle working fluid very well by using the heat transfer oil medium with a large specific heat capacity as the heat transfer carrier of the middle and low grade heat source, with less heat transfer loss and good Solve the practical problems that heat such as solar energy, industrial waste heat, and biomass energy cannot be directly utilized

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