US 2016/0108763 A1Published application

Rankine cycle power generation system with sc-co2 working fluid and integrated absorption refrigeratino chiller

AssigneeUmm Al-Qura University

InventorsAbdullah Ali R. AlZahrani, Ibrahim Dincer

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Abstract

A power generation system in which a Rankine condensation power cycle using supercritical CO2 as the working fluid is integrated with an absorption refrigeration chiller wherein the refrigerant is a mixture of ammonia and water, and the refrigerant is circulated in heat exchange relationship with the working fluid in a refrigerant evaporator that is a condenser for the working fluid. Thermal energy for the power cycle is supplied by a concentrating solar power plant.

Claims17

Dependent claims

A power generation system comprising:

a Rankine condensation power cycle using supercritical CO2 as a working fluid, wherein thermal energy for the power cycle is provided by an externally supplied heat transfer fluid, said power cycle having a working fluid circulation loop comprising:
a heater through which the heat transfer fluid and CO2 are circulated in heat exchange relationship to heat the CO2 to a supercritical temperature and pressure first state;
a high pressure turbine connected to receive the supercritical CO2 which expands in the high pressure turbine to a lower temperature and pressure second state;
a reheater connected to receive the second state CO2 and heat it to a third state;
a low pressure turbine connected to receive the CO2 from the reheater and expand the CO2 to a fourth state;
an internal heat exchanger connected to receive the fourth state CO2 from the low pressure turbine and through which the fourth state CO2 passes and gives up some of its heat to leave the internal heat exchanger at a fifth state;
a working fluid condenser connected to receive the CO2 from the internal heat exchanger and through which the fifth state CO2 passes and is condensed to a liquid sixth state;
and
a working fluid pump for pumping the liquid CO2 back through the internal heat exchanger and to the heater to repeat the cycle;
and
a heat driven absorption refrigeration cycle integrated with the power cycle at the condenser of the working fluid circulation loop to provide cooling duties required by the power cycle to condense the CO2, wherein the refrigeration cycle has a refrigerant circulation loop comprising:
a desorber through which the refrigerant is circulated in heat exchange relationship with the heat transfer fluid from the heater and reheater in the working fluid circulation loop to use the relatively low-grade thermal energy in the heat exchange fluid to vaporize the refrigerant;
a refrigerant condenser connected to receive and condense the vaporized refrigerant;
and
an evaporator connected to receive the condensed refrigerant and through which the refrigerant is circulated in heat exchange relationship with the working fluid to evaporate the refrigerant and take up heat from the working fluid and condense the working fluid, said evaporator comprising the condenser in the working fluid circulation loop.

12 more elements

A power generation system comprising:

a Rankine condensation power cycle using supercritical CO2 as a working fluid, wherein thermal energy for the power cycle is supplied by a concentrating solar power plant, said power cycle having a working fluid circulation loop comprising:
a heater through which the heat transfer fluid is circulated in heat exchange relationship with CO2 to heat the CO2 to SC-CO2;
work producing means through which the SC-CO2 expands to produce a work output;
a working fluid condenser for receiving the expanded SC-CO2 from the work producing means and condensing the SC-CO2 to a liquid state;
and
a pump for pumping the condensed SC-CO2 back to the heater to repeat the cycle;
and
an absorption refrigeration system integrated with the power cycle to chill the working fluid in the condenser, said absorption refrigeration system having a refrigerant circulation loop comprising:
a desorber through which the refrigerant is circulated in heat exchange relationship with the heat transfer fluid to vaporize the refrigerant;
and
a refrigerant condenser for condensing the vaporized refrigerant, said condenser in the working fluid circulation loop connected to receive the condensed refrigerant, where the refrigerant expands and takes up heat in the working fluid to condense the working fluid to a liquid state.

8 more elements

Dependencies are inferred from the claim text.

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Abstract

A power generation system comprising:

a Rankine condensation power cycle using supercritical CO2 as a working fluid, wherein thermal energy for the power cycle is provided by an externally supplied heat transfer fluid, said power cycle having a working fluid circulation loop comprising:
a heater through which the heat transfer fluid and CO2 are circulated in heat exchange relationship to heat the CO2 to a supercritical temperature and pressure first state;
a high pressure turbine connected to receive the supercritical CO2 which expands in the high pressure turbine to a lower temperature and pressure second state;
a reheater connected to receive the second state CO2 and heat it to a third state;
a low pressure turbine connected to receive the CO2 from the reheater and expand the CO2 to a fourth state;
an internal heat exchanger connected to receive the fourth state CO2 from the low pressure turbine and through which the fourth state CO2 passes and gives up some of its heat to leave the internal heat exchanger at a fifth state;
a working fluid condenser connected to receive the CO2 from the internal heat exchanger and through which the fifth state CO2 passes and is condensed to a liquid sixth state;
and
a working fluid pump for pumping the liquid CO2 back through the internal heat exchanger and to the heater to repeat the cycle;
and
a heat driven absorption refrigeration cycle integrated with the power cycle at the condenser of the working fluid circulation loop to provide cooling duties required by the power cycle to condense the CO2, wherein the refrigeration cycle has a refrigerant circulation loop comprising:
a desorber through which the refrigerant is circulated in heat exchange relationship with the heat transfer fluid from the heater and reheater in the working fluid circulation loop to use the relatively low-grade thermal energy in the heat exchange fluid to vaporize the refrigerant;
a refrigerant condenser connected to receive and condense the vaporized refrigerant;
and
an evaporator connected to receive the condensed refrigerant and through which the refrigerant is circulated in heat exchange relationship with the working fluid to evaporate the refrigerant and take up heat from the working fluid and condense the working fluid, said evaporator comprising the condenser in the working fluid circulation loop.

12 more elements