Organic motive fluid based waste heat recovery system

摘要

A waste heat recovery system includes a closed fluid circuit through which an organic motive fluid flows, and a heat exchanger for transferring heat from waste heat gases to the motive fluid. A first flashing unit flashes the motive fluid which exits the heat exchanger into a high pressure flashed vapor portion. Another flashing unit flashes liquid non-flashed motive fluid, producing a low pressure flashed vapor portion. A high pressure turbine module receives the high pressure flashed vapor portion to produce power, and a low pressure turbine module receives a combined flow of motive fluid vapor comprising the low pressure flashed vapor portion and discharge vapor from the high pressure turbine module whereby additional power is produced.

主权项

1. A waste heat recovery system, comprising:
a closed fluid circuit through which an organic motive fluid flows, a heat exchanger connected to receive waste heat combustion gases and communicating with said closed fluid circuit for transferring heat from the waste heat combustion gases to an organic motive fluid liquid flowing in said heat exchanger in the closed fluid circuit, first organic motive fluid flashing means connected to said closed fluid circuit at a position of the closed fluid circuit for flashing the organic motive fluid liquid which exits said heat exchanger into a high pressure flashed organic motive fluid vapor portion, second organic motive fluid flashing means connected to said closed fluid circuit at a position of the closed fluid circuit for flashing liquid remaining non-flashed organic motive fluid, producing a low pressure flashed organic motive fluid vapor portion, a high pressure organic vapor turbine module connected to said closed fluid circuit at a position of the closed fluid circuit to receive said high pressure flashed organic motive fluid vapor portion directly from the first organic motive fluid flashing means to produce power, a low pressure organic vapor turbine module connected to said closed fluid circuit at a position of the closed fluid circuit to directly receive a combined flow of organic motive fluid vapor comprising said low pressure flashed organic motive fluid vapor portion from the second organic motive fluid flashing means and discharge organic motive fluid vapor from said high pressure organic vapor turbine module, whereby additional power is produced, an organic motive fluid recuperator for receiving high pressure organic vapor discharged from said high pressure organic vapor turbine module, a further organic motive fluid recuperator for receiving low pressure organic vapor discharged from said low pressure organic vapor turbine module, an organic vapor condenser for condensing discharge organic vapor from the low pressure organic vapor turbine module, the organic vapor condenser producing organic motive fluid condensate for supply to said heat exchanger, and a cycle pump for delivering a portion of the organic motive fluid condensate to said organic motive fluid recuperator and for delivering a further portion of the organic motive fluid condensate to said further organic motive fluid recuperator.