Power generation system employing power amplifying thermo-mechanical inverter technology
Modern thermal power plants based on classical thermodynamic power cycles suffer from an upper bound efficiency restriction imposed by the Carnot principle. This disclosure teaches how to break away from the classical thermodynamics paradigm in configuring a thermal power plant so that its efficiency will not be restricted by the Carnot principle. The power generation system described herein makes a path for the next generation of low-to-moderate temperature thermal power plants to run at significantly higher efficiencies powered by renewable energy. This disclosure also reveals novel high-performance power schemes with integrated fuel cell technology, driven by a variety of fuels such as hydrogen, ammonia, syngas, methane and natural gas, leading toward low-to-zero emission power generation for the future.
1 . A power generation system, comprising:
a first subsystem, the first subsystem including one or more mechanical work-consuming components, and the one or more mechanical work-consuming components including at least one compressor or one pump;
a second subsystem, the second subsystem including one or more components that output mechanical work, and the one or more components that output mechanical work including at least one expander;
a third subsystem, the third subsystem including one or more heat-consuming components, and the one or more heat-consuming components including at least one heat exchanger with an external thermal feed to the power generation system; and
a fourth subsystem, the fourth subsystem including one or more heat sinks in the power generation system which dissipate heat to the surroundings, the one or more heat sinks including a single heat sink or flue gas outlet;
wherein the first, second, third, and fourth subsystems are configured to interact with each other by exchanging matter from one or more working fluids and by exchanging heat, such that the first, second, third, and fourth subsystems cooperate to maximize energy conversion efficiency; and
wherein, when the power generation system is in operation for a particular finite time period, the first subsystem consumes W in quantity of mechanical work from one or more external sources, the third subsystem consumes Q quantity of heat from one or more external sources, while the second subsystem outputs W out quantity of mechanical work, such that the energy conversion efficiency η of the power generation system is a function of W out , W in , and Q.
2 . The power generation system according to claim 1 , wherein the consumed mechanical work (W in ) by the first subsystem is supplied by a renewable energy field comprising wind electric generators, solar photovoltaic electricity generators, hydrogen gas generators, and/or fuel cell electric generators; and the output mechanical work (W out ) of the second subsystem is utilized to generate electric power to an electric network which in turn drives electric loads.
3 . The power generation system according to claim 2 , wherein a portion of the consumed heat (Q) by the third subsystem is supplied by external heat sources, the external heat sources including solar thermal collectors, geo-thermal sources, and/or any other renewable energy driven process in which heat is liberated as a byproduct.
4 . The power generation system according to claim 3 , wherein the power generation system exchanges the one or more working fluids with exterior surroundings, and the fourth subsystem dissipates heat to the exterior surroundings by releasing the one or more working fluids to the exterior surroundings, thus operating in an open cycle.
5 . The power generation system according to claim 3 , wherein the power generation system is sealed and enclosed from exterior surroundings so that the one or more working fluids are not exchanged between the power generation system and the exterior surroundings; the at least one heat exchanger of the third subsystem being externally heated so as to heat the enclosed one or more working fluids, thus providing a means of supplying heat to the power generation system; and the fourth subsystem comprising at least one externally cooled heat exchanger so as to cool the one or more working fluids and provide a means of dissipation of heat from the power generation system, thus the power generation system operates in a closed cycle.
6 . The power generation system according to claim 4 , wherein the first subsystem comprises one or more compressors which extract atmospheric air, and the one or more compressors compress the atmospheric air to pressures higher than atmospheric pressure; and the at least one expander of the second subsystem comprises one or more rotary or reciprocating expanders configured to expand heated compressed air delivered by the third subsystem.
7 . The power generation system according to claim 6 , wherein a portion of the consumed heat (Q) in the third subsystem is supplied internally by combusting environmentally-friendly fuels in suitably designed combustion chambers.
8 . The power generation system according to claim 7 , wherein the power generation system comprises a first set of one or more compressors that form part of the first subsystem, a first set of one or more expanders that form part of the second subsystem, cold-flow passages of a first set of one or more heat regenerators that form part of the third subsystem where the working fluid gains heat, and hot-flow passages of the first set of the one or more heat regenerators that form part of the fourth subsystem where the working fluid rejects heat; and
the power generation system further comprises one or more fuel cells which operate at a fuel cell operating pressure, the one or more fuel cells generate direct current (DC) electricity to power electrical motors to drive all the mechanical work-consuming components;
wherein the first set of one or more compressors extract atmospheric air, compress the atmospheric air to produce a compressed air stream, and the one or more compressors deliver the compressed air stream at a pressure just above the fuel operating pressure of the one or more fuel cells.
9 . The power generation system according to claim 8 , wherein the first set of the one or more compressors delivers compressed air to the cold-flow passages of the first set of one or more heat regenerators so that heated compressed air is fed to cathode flow passages of the one or more fuel cells, while a compressed and heated gaseous fuel is fed to anode flow passages of the one or more fuel cells, the one or more fuel cells generating electricity by electrolytic oxidation reaction that takes place in a fuel cell electrolyte layer at a high temperature, between a portion of the fuel fed to the anode flow passages and a portion of the oxygen in the compressed air stream fed to the cathode flow passages;
wherein the hot gas streams expelled by the anode and cathode flow passages are fed to a post-combustor where the unreacted fuel is allowed to complete its oxidation reaction by combining with the oxygen in the hot compressed air stream, the post-combustor thus expelling a hot flue gas stream comprising the combustion products;
wherein the flue gas stream expelled by the post-combustor is fed to the first set of one or more expanders, the first set of one or more expanders producing mechanical power to drive one or more alternating current (AC) electricity generators, the flue gas expands in the first set of one or more expanders to near-atmospheric pressure;
wherein the expanded flue gases expelled by the first set of one or more expanders pass through the hot-flow passages of the first set of one or more heat regenerators in a series arrangement from the highest temperature regenerator to the lowest temperature regenerator; and
wherein the flue gas stream has rejected heat now at approximately atmospheric pressure that escapes to the atmosphere, thus forming a low-pressure power cycle.
10 . The power generation system according to claim 9 , wherein the first set of one or more heat regenerators comprises two or more heat regenerators placed in series, so that the compressed air supplied by the first set of one or more compressors flows through the lowest temperature heat regenerator to the highest temperature heat regenerator in the sequence of progressively increasing temperature;
wherein a portion of the compressed air is extracted through a bypass flowline from a port placed in between the first set of heat regenerators so that the bypassed air stream is not fully heated as the non-bypassed stream that flows into the cathode flow passages of the one or more fuel cells;
wherein the first set of one or more compressors and the first set of one or more expanders are mounted on respective shafts which are coupled through an electric clutch, so that mechanical power can be transferred in both directions;
wherein the partially heated bypassed compressed air stream is mixed with the hot flue gas stream expelled by the post-combustor in a mixing chamber so as to form a mixed stream that is fed to the first set of one or more expanders, the first set of one or more expanders generating mechanical power to drive the one or more alternating current (AC) electricity generators;
wherein the one or more fuel cells generate direct current (DC) electricity to drive the first set of one or more compressors; and
wherein the direct current (DC) electricity generated by the one or more fuel cells in excess of the power consumed by the first set of one or more compressors in the low-pressure power cycle is transferred to one of the shafts of the first set of one or more expanders to drive the one or more alternating current (AC) electricity generators.
11 . The power generation system according to claim 6 , wherein the power generation system further comprises one or more glass canopies mounted at different elevations, one or more rigid structures to hold the glass canopies, one or more chimneys, one or more external heat exchangers to heat one or more air streams by concentrated solar rays, one or more regenerative heat exchangers comprising cold air passages and hot air passages wherein the hot air passages transfer heat to the cold air passages, one or more solar photovoltaic (PV) arrays, and one or more battery banks;
wherein the one or more solar PV arrays generate electricity and store the electricity in the one or more battery banks, and the stored electricity in the one or more battery banks drives the one or more compressors of the first subsystem;
wherein the one or more compressors of the first subsystem extract atmospheric air, compress the air to a higher pressure, deliver the air to the cold passages of the one or more regenerative heat exchangers to be heated by air flowing in the hot passages;
wherein the one or more regenerative heat exchangers deliver the regeneratively heated air to the one or more external heat exchangers which are mounted under the glass canopies and are externally heated by the concentrated solar rays;
wherein the heated air passes through the one or more expanders of the second subsystem delivering the mechanical power to drive one or more electricity generators mounted on the shafts of the one or more expanders of the second subsystem;
wherein the expanded air exits the one or more expanders of the second subsystem and passes through the hot passages of the one or more regenerative heat exchangers;
wherein the one or more hot air passages of the regenerative heat exchangers deliver the hot air to a bottom of the one or more chimneys, and the one or more chimneys drive the hot air draft upwards creating a sub-atmospheric pressure at the bottom of the one or more chimneys.
12 . The power generation system according to claim 11 , further comprising one or more fuel combustors incorporated at inlets of the one or more expanders of the second subsystem to supplement heat supplied to the one or more air streams so that the one or more air streams that enter the one or more expanders of the second subsystem are at a certain predetermined temperature.