WO2019210309A1 - Système et procédé de production d'électricité par réduction de pression de gaz naturel - Google Patents

Système et procédé de production d'électricité par réduction de pression de gaz naturel Download PDF

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Publication number
WO2019210309A1
WO2019210309A1 PCT/US2019/029677 US2019029677W WO2019210309A1 WO 2019210309 A1 WO2019210309 A1 WO 2019210309A1 US 2019029677 W US2019029677 W US 2019029677W WO 2019210309 A1 WO2019210309 A1 WO 2019210309A1
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WO
WIPO (PCT)
Prior art keywords
turboexpander
enclosure
process gas
electrical
pressure
Prior art date
Application number
PCT/US2019/029677
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English (en)
Inventor
Andrew Brash PEARSON
Original Assignee
Anax Holdings, Llc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Anax Holdings, Llc filed Critical Anax Holdings, Llc
Priority to US16/663,151 priority Critical patent/US20200059179A1/en
Publication of WO2019210309A1 publication Critical patent/WO2019210309A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
    • F02C1/00—Gas-turbine plants characterised by the use of hot gases or unheated pressurised gases, as the working fluid
    • F02C1/02—Gas-turbine plants characterised by the use of hot gases or unheated pressurised gases, as the working fluid the working fluid being an unheated pressurised gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K25/00—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
    • F01K25/02—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for the fluid remaining in the liquid phase
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
    • F02C6/00—Plural gas-turbine plants; Combinations of gas-turbine plants with other apparatus; Adaptations of gas-turbine plants for special use
    • F02C6/18—Plural gas-turbine plants; Combinations of gas-turbine plants with other apparatus; Adaptations of gas-turbine plants for special use using the waste heat of gas-turbine plants outside the plants themselves, e.g. gas-turbine power heat plants
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
    • F01D15/10—Adaptations for driving, or combinations with, electric generators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2220/00—Application
    • F05D2220/60—Application making use of surplus or waste energy
    • F05D2220/64—Application making use of surplus or waste energy for domestic central heating or production of electricity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2220/00—Application
    • F05D2220/70—Application in combination with
    • F05D2220/76—Application in combination with an electrical generator
    • F05D2220/768—Application in combination with an electrical generator equipped with permanent magnets

Definitions

  • the present disclosure relates to the electrical power conversion and transmission for turboexpander generator systems. More specifically, the present disclosure relates to the deli very of AC power at standard domestic power supply frequencies from turboexpander generators operating at high rotational speeds.
  • Natural gas is obtained from wells drilled into in rock formations deep underground, where natural gas is found alone and in association with other hydrocarbon fuels such as petroleum and coal deposits.
  • natural gas from such wells is cleaned, typically compressed, and is then distributed by a system of natural gas pipelines to the industrial and residential sites of use of the natural gas as a fuel. Since the natural gas in the distribution pipeline is typically at a higher pressure than the pressure needed at the site of use, a pressure let down station is usually situated between the sites of use and the high pressure pipeline distribution system as a facility where the pressure of the natural gas can be reduced before the natural gas is delivered to where it will be used.
  • the process of reducing the pressure of the natural gas at a pressure let down station provides an opportunity to recover use fill energy without the combustion of the natural gas. It is desirable have an alternative to combustion, since complete combustion produces carbon dioxide a greenhouse gas and incomplete combustion can release methane, also a greenhouse gas, that is a major component of natural gas. From one perspective, the recover) ' of energy from the pressure differential between the natural gas in die distribution pipeline system and the natural gas downstream of the site of a pressure let down station can be regarded as the recovery of“waste heat/’ energy that would otherwise be unavailable for use.
  • g (gamma) is the index of compression (or expansion) and k is a constant value.
  • Enthalpy is a useful concept because the form of the energy is not specified, so heat energy, potential energy and work energy are all subject to the same rules and can be treated die same way. For a consistent set of calculations, the enthalpy is given relative to a datum point so care must be taken in comparing different calculations done at different times by different people to ensure that they used the same datum. It is usual to consider the enthalpy per mass of the gas, sometimes called the specific enthalpy, which is measured in BTU per poimd, or in the metric system, in ki per kg.
  • the Joule-Thompson effect causes the outlet gas to cool, typically by about 5 °F per 100 psi pressure drop.
  • the pressure of natural gas is reduced from 930 psig to 120 psig, a 810 psi (55.8 Bar) pressure drop, the gas might drop from an inlet temperature of 60 °F (15.6 °C) to about 9.4 °F (-12.6 °C).
  • Natural gas at a temperature of 9.4 °F (-12.6 °C) is too cold for onward transmission, so pressure let down stations typically incorporate some form of heating, often just taking a small portion of the natural gas and burning it to heat a water bath which is used to warm up the gas flow either before or after expansion.
  • the invention is directed to these and other important needs. Solutions are needed that recover the energy available due to the pressure differential between the inlet and the outlet of the pressure let down station, and without causing a reduction in temperature that would make the natural gas too cold for onward transmission to the site of its use.
  • a traditional turboexpander generator the rotation of a shaft assembly driven by torque imparted by expanding gas in a turboexpander unit produces an electrical current via the interaction of permanent magnets in the rotor shaft and the surrounding stator.
  • the rotor shafts can rotate at speeds of over 20,000 rpm, leading to the generation of AC electricity with high frequencies, such as over about 650 Hz or over about 750 Hz.
  • the produced electrical current is transferred through a power feed-through to make electrical connections with a terminal box that contains systems, in some instances an inverter where the electrical current is first rectified to DC then converted to AC, to convert the high-frequency AC power into an electrical powvr output consistent with tire voltage and frequency characteristics of the local electricity grid, which typically operates at 50-60 Hz.
  • An improved traditional turboexpander generator is provided in the present disclosure.
  • the high-frequency AC current created by the permanent magnet generator is converted to DC current within the turboexpander enclosure.
  • the DC current is transferred via a DC-DC bus bar to a second enclosure, which may be a controller enclosure or terminal box. Skin effect makes the use of a bus bar for AC current transfer impractical at the frequency ranges in high-performance turboexpander generators.
  • the present disclosure provides for turboexpander generator systems comprising a permanent magnet generator and an electrical conversion system.
  • the electrical conversion system can comprise an AC/DC converter.
  • the AC/DC converter can be mounted on the permanent magnet generator within a common enclosure with the permanent magnet generator.
  • the AC/DC converter can be a dual rectifier stack.
  • One or more DC bus bars can be provided to transmit DC current generated by the AC/DC converter to a second enclosure .
  • the second enclosure can be a controller enclosure or a terminal box.
  • a DC/AC inverter can be provided within the second enclosure.
  • the DC/AC inverter can be configured to generate AC current appropriate for transmission to a utility grid.
  • the AC current can he three-phase 60 Hz AC.
  • the electrical conversion system can be configured for 275 kVA power from the permanent magnet generator.
  • the generated current from the second enclosure can be 480 Vrms L-L.
  • Hie present disclosure provides methods of generating electrical power.
  • Hie methods can comprise generating a first AC electrical current from a permanent magnet generator, transmitting the first AC electrical current to an AC/DC converter contained within a common enclosure with the permanent magnet generator, converting the first AC electrical current to a DC electrical current with the AC/DC converter, transmitting tire DC electrical current via one or more DC bus bars to a second enclosure, inverting the DC electrical current with an inverter located within the second enclosure to generate a second AC electrical current.
  • the methods can further comprise transmitting the second AC electrical current from the second enclosure to a utility grid.
  • the first AC electrical current can have about 275 kVA apparent power.
  • the second AC electrical current can be generated as 480 Vrms L-L 60 Hz current.
  • FIG. 1.4 is a schematic diagram of an implementation of the disclosed system 10, showing the path of a process gas from a process gas inlet 50 passing through a first heat exchanger 410, a first stage turboexpander 110, a second heat exchanger 420, a second stage turboexpander 210, to a process gas outlet 60, where the first stage turboexpander 110 and the second stage turboexpander 210 are operatively coupled to a generator 310 by a shaft assembly 340, wherein, in use, the flow of the process gas through the system 10 from the process gas inlet 50 to the process gas outlet 60 produces an electrical output 80.
  • FIG. IB is a block diagram of an implementation of a system controller 500, showing the system controller 500 operatively connected to a first stage turboexpander 110, a second stage turboexpander 210, a generator 310, an electrical conversion system 380, a first heat exchanger 410, a second heat exchanger 420, a valve system 600 and a sensor system 700.
  • FIG. 2 is a schematic diagram showing aspects of an implementation of the disclosed systems and methods.
  • FIG. 3 is a schematic diagram showing aspects of an implementation of the disclosed systems and methods.
  • FIG. 4 is a schematic diagram showing aspects of an implementation of the disclosed systems and methods.
  • a“turboexpander” is a radial or axial flow turbine through which a relatively high pressure gas is expanded to produce work.
  • working fluid As used herein,“working fluid,”“process gas,” or“pipeline natural gas” refers to natural gas that has been processed and transported in a natural gas distribution pipeline system and which is available for use by the disclosed system and apparatus. Typically, certain components of the gas that is obtained from the wellhead are removed before the natural gas is introduced into a pipeline system. Examples of the typical chemical composition of pipeline natural gas are provided in Table 1. below.
  • “secondary fluid,”’ or“heat-transfer fluid” refers to a fluid that is used to heat or cool the process gas or the control electronics.
  • the secondary fluid is supplied to a heat exchanger to heat the process gas.
  • the secondary fluid is water or an aqueous solution.
  • the secondary fluid can be an aqueous solution of an antifreeze additive, such as propylene glycol, ethylene glycol, glycerol, or combinations thereof.
  • an antifreeze additive such as propylene glycol, ethylene glycol, glycerol, or combinations thereof.
  • a heat-transfer fluid can be provided for use in heat exchangers as part of a heating circuit and can be any fluid suitable for transferring heat to a process gas, including but not limited to oils and aqueous solutions.
  • the heat-transfer fluid can be a dielectric fluid, including but not limited to one or more perfluorinated carbons, including but not limited to FLUORINERTTM (3M Company, St. Paul, MN), synthetic hydrocarbons, including but not limited to polyalphaolefms (PAO), or combinations thereof.
  • two distinct heat-transfer fluid circuits are provided, with a first heat-transfer fluid circuit provided for cooling the control electronics and a second heat- transfer fluid circuit provided for heating the process gas.
  • heat that is removed from the control electronics can be used m the heating of the process gas by transferring heat between the first and second heat-transfer circuits.
  • An apparatus comprising a process gas system inlet, a process gas system outlet, at least two turboexpanders (a centrifugal or axial flow turbine through which a high pressure process gas is expanded to produce work), and at least one electrical generator operatively coupled to the at least two turboexpanders wherein electrical energy is produced by using the pressure difference between the process gas system inlet and the process gas system outlet.
  • the process gas is natural gas in a natural gas distribution pipeline system.
  • an implementation of the disclosed system is placed at a site between a high pressure location in a natural gas distribution pipeline and a lower pressure location, such as a pressure let down station (also termed a “city gate” station), in order to recover energy from the reduction in pressure required to provide die natural gas at a pressure suitable for consumers.
  • a pressure let down station also termed a “city gate” station
  • FIG. 1A is a schematic diagram of an implementation of the disclosed system 10, showing the path of a process gas from a process gas inlet 50 passing through a first heat exchanger 410, a first stage turboexpander 1 10, a second heat exchanger 420; a second stage turboexpander 210, to a process gas outlet 60, where the first stage turboexpander 110 and the second stage turboexpander 210 are operatively coupled to a generator 310 by a shaft assembly 340, wherein, in use, the flow of the process gas through the system 10 from the process gas inlet 50 to the process gas outlet 60 produces an electrical output 80, which is routed to an electrical conversion system 380 (not shown in FIG. 1A) described more fully elsewhere herein.
  • an electrical conversion system 380 not shown in FIG. 1A
  • the process gas enters the process gas inlet 401C of the first heat exchanger 410 acting as a preheater to warm the process gas using heat provided by a secondary fluid flowing from the secondary fluid inlet 202B to the secondary fluid outlet 202A of the first heat exchanger 410.
  • a suitable secondary fluid is an aqueous solution.
  • the secondary fluid comprises propylene glycol.
  • the secondary fluid is a 30% aqueous solution of propylene glycol.
  • the process gas flows from the process gas outlet 40 ID of the first heat exchanger 410 to the process gas inlet 101 C of the first stage turboexpander 1 10.
  • the flow rate and pressure of the process gas are controlled the disclosed system by valves and regulators in the system upstream of the process gas inlet 401C by stractures and methods known to one of skill in the art.
  • Tire temperature, flow rate and pressure of the process gas are further adjusted by the first heat exchanger 410.
  • the process gas leaves the first stage turboexpander 110 though tire process gas outlet 10 ID and flows to the process gas inlet 402B of the second heat exchanger 420 that act as an interheater to warm the process gas between the first stage turboexpander 110 and the second stage turboexpander 210 in order to adjust the temperature, flow rate and pressure of the process gas.
  • the process gas entering the process gas inlet 402B of the second heat exchanger 420 is warmed by heat provided by a secondary fluid flowing from the secondary fluid inlet 202D to the secondary fluid outlet 202C of the second heat exchanger 420.
  • a suitable secondary thud is an aqueous solution.
  • the secondary fluid comprises propylene glycol.
  • tire secondary fluid is a 30% aqueous solution of propylene glycol.
  • the process gas flows from the process gas outlet 402A of the second heat exchanger 420 to the process gas inlet 101B of the second stage turboexpander 210. Upon exiting the process gas outlet 101 A of the second stage turboexpander 210, the process gas flows to the system process gas outlet 60.
  • the generator 310 can coupled to a first stage turbine shaft of the first stage turboexpander 110 and a second stage turbine shaft of the second stage turboexpander 210 by a shaft assembly. In use, the rotation of the shaft assembly and the interaction of permanent magnets and a stator produces an electrical current that flows through the electrical power output 80.
  • a torque can be imparted on the shaft assembly by the expanding gas in the one or more turboexpanders and the torque can be converted to electricity by the electrical generator.
  • the electrical power output 80 from the turboexpander and the electrical generator can pass to an inverter where it is first rectified to DC then converted to AC at a voltage and frequency to be consistent with the characteristics of the local electricity grid.
  • the electrical generator can be a permanent magnet generator.
  • the methods can further comprise sensing an operational characteristic using at least one sensor selected from the group consisting of a sensor that is configured to detect a flow' rate of the process gas, a sensor that is configured to detect a pressure of the process gas, and a sensor that is configured to detect a temperature of the process gas.
  • the methods can further comprise sensing an operational characteristic using at least one sensor selected from the group consisting of a sensor that is configured to detect a flow rate of the heat-transfer fluid, a sensor that is configured to detect the pressure of the heat-transfer fluid, and a sensor that is configured to detect the temperature of the heat- transfer fluid.
  • the electrical output 80 can converted to local electricity grid AC voltage, as shown schematically in FIGs. 2-4 and described elsewhere herein.
  • the approach shown schematically in FIGs. 3-5 can be applied to the systems shown in FIGs. 1A- IB and described herein.
  • a turboexpander and generator unit has a two stage process gas expander, each stage including a turboexpander and a heat exchanger.
  • High pressure (HP) process gas is first heated to increase the process gas volume and maintain the temperature inside the expander.
  • the heated HP process gas then passes to the first stage turboexpander where it imparts a torque on the common shaft as it expands through the turbine.
  • the process gas then leaves the first stage turboexpander at an inter-stage pressure lower than the pressure at the entry to the first stage turboexpander and is heated again. This second heating further increases the process gas volume, maintains the temperature inside the turboexpander and generator unit and ensures the process gas leaving the second stage turboexpander is not too cold.
  • the process gas flows through the second stage turboexpander and imparts a torque on the common shaft as the process gas expands through the turbine.
  • the torque imparted on the common shaft by the expanding gas is converted to electricity by the permanent magnet generator.
  • the electrical power output from the turboexpander and generator unit passes to the inverter where it is first rectified to DC then converted to AC at a voltage and frequency to be consistent with the characteristics of tire local electricity grid.
  • tire turboexpander turbines are configured to operate at a speed of about 20,000 to about 25,000 rpm. In certain implementations, the turboexpander turbines are configured to operate at a speed of about 21 ,500 to about 24,000 rpm. In some implementations, the turboexpander turbines are designed for a speed of about 22,500 rpm, and an inlet gas temperature of about 328 °K (54.85 °C, 130 °F). In exemplary
  • the temperature of the process gas at the inlet of the first stage turboexpander and the temperature of the process gas at the inlet of the second stage turboexpander is maintained by using a first heat exchanger and a second heat exchanger, respectively, wherein the first heat exchanger and the second heat exchanger transfer heat from a secondary fluid, such as a 30% aqueous solution of propylene glycol, to tire primary fluid or process gas, the natural gas.
  • a secondary fluid such as a 30% aqueous solution of propylene glycol
  • the pressure of the process gas at the system inlet is about 754 psi (52 Bar)
  • the pressure of the process gas at the system outlet is about 465.6 psi (32.1 Bar)
  • the system pressure ratio is 1.62.
  • the pressure of the process gas at the first stage inlet is about 750 psi (51.7 Bar)
  • the pressure of the process gas at the first stage outlet is about 594.7 psi (41 Bar)
  • the first stage pressure ratio is 1.27.
  • the pressure of the process gas at the second stage inlet i.e., the inlet of the second stage turboexpander
  • the pressure of the process gas at the second stage outlet i.e., the outlet of the second stage turboexpander
  • the second stage pressure ratio is 1.27.
  • implementations of the disclosed turboexpander and generator unit and associated system operate with a flow rate of process gas of about 4 kg/sec (12,036 scfm, 528 lb/min) to about 7.5 kg/sec (22,568 scfm, 990 Ib/min).
  • the disclosed turboexpander and generator unit and associated system operate with a flow rate of process gas of about 4.5 kg/sec (13,541 scfm, 594 lb/min) to about 6.5 kg/sec (19,559 scfm, 858 lb/min).
  • tire disclosed turboexpander and generator unit and associated system configured to the range of conditions exemplified by the values summarized in Table 2, above, operates with a flow rate of process gas of about 5 kg/sec (15,045 scfrn, 660 ib/min) to about 6 kg/sec (18,054 scfm, 792 Ib/rnin).
  • the disclosed turboexpander and generator unit and associated system configured to the range of conditions operating in a range of conditions exemplified by the values summarized in Table 2, above, can produce an electrical power output of about 225 to about 275 kw, more preferably about 238 to about 263 kW, and typically about 250 kW.
  • the disclosed turboexpander and generator unit and associated system configured to the range of conditi ons operating in a range of conditions exemplified by the values summarized in Table 2, above, can produce an electrical power output of about 250 kW.
  • An exemplar ⁇ implementation of a turboexpander and generator unit shown schematically in FIG. IB, can be configured with related components in a readily transportable turn-key system having components including a controller system 500 operatively connected to a first stage turboexpander 110, a second stage turboexpander 210, a generator 310, an electrical conversion system 380, a first heat exchanger 410, a second heat exchanger 420, a valve system 600 and a sensor system 700 mounted in a frame comprising steel or a material having similar characteristics.
  • the system is pre -configured with piping and wiring, and requires only connection to sources of natural gas, instrament grade compressed air, warm w ater and electricity.
  • the required electrical supply to the assembly is three phase 480 volts, 60 Hz.
  • the frame is configured for commercial containerized transportation.
  • the control electronics are contained in a purged cabinet and at least one panel that houses the control electronics is cooled by a heat exchanger system.
  • the control electronics are mounted in a control panel that is cooled by water or an aqueous solution.
  • the control panel is cooled by the secondary fluid, and waste heat extracted by cooling the control electronics can be supplied to the first heat exchanger 410 and the second heat exchanger 420 as a contribution to hearing the process gas.
  • the electrical supply to the control panel is Single phase 120 volts, 60 Hz.
  • control electronics include a programmable logic controller.
  • control electronics include a computer comprising a microprocessor, a visual display, nonvolatile memor ', RAM memory, and at least one user input device selected from a touch screen, a keypad, a keyboard, a mouse, a touch pad, track pad and a track ball.
  • the computer is connected to a local network by ethemet or a wireless connection, and to the Internet.
  • the electrical conversion system 380 can be implemented as shown in FIGs 2-4.
  • Hie generator 310 (labeled“PM Generator’ or“PMG” in FIGs. 2-3) can provide electrical output that connects to an AC/DC converter that is part of the electrical conversion system 380.
  • Tire AC/DC converter can be a dual rectifier stack that is mounted on the generator 310, as shown in FIG. 3 (dashed box on left-hand side of FIG. 3).
  • DC current generated by the AC/DC converter is transmitted via DC bus bars to a second enclosure (dashed box on right-hand side of FIG. 3), which may be a controller enclosure or terminal box.
  • a DC/AC inverter can be provided within the second enclosure, which generates AC current appropriate for transmission to a utility grid.
  • the AC current can be three-phase 60 Hz AC.
  • the electrical conversion system can be configured for 275 kVA power from the PMG.
  • the generated current from the second enclosure can be 480 Vnrns L-L.
  • FIG. 4 shows aspects of an implementation of the AC/DC converter of FIGs. 2-3.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Control Of Eletrric Generators (AREA)

Abstract

L'invention concerne un système de production d'énergie ayant un générateur à aimant permanent et un système de conversion électrique. Le système de conversion électrique peut avoir un convertisseur CA/CC et un onduleur CC/CA. Le convertisseur CA/CC peut être monté sur le générateur à aimant permanent à l'intérieur d'une enceinte commune avec le générateur à aimant permanent. Une ou plusieurs barres omnibus CC peuvent transmettre un courant CC généré par le convertisseur CA/CC à une seconde enceinte, qui peut avoir un onduleur CC/CA pour générer une énergie CA.
PCT/US2019/029677 2017-04-27 2019-04-29 Système et procédé de production d'électricité par réduction de pression de gaz naturel WO2019210309A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US16/663,151 US20200059179A1 (en) 2017-04-27 2019-10-24 System and method for electricity production from pressure reduction of natural gas

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US201862664009P 2018-04-27 2018-04-27
US201862664021P 2018-04-27 2018-04-27
US62/664,021 2018-04-27
US62/664,009 2018-04-27

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