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Hydraulically powered exhaust gas recirculation system

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TLDR
A hydraulically powered exhaust gas recirculation system for an internal combustion engine as discussed by the authors includes a turbine that powers a compressor and a mixer that combines the air and the recirculated exhaust gas and delivers the mixture to the intake manifold.
Abstract
A hydraulically powered exhaust gas recirculation system for an internal combustion engine includes a hydraulically driven turbine ( 71 ) that powers a compressor ( 72 ). The compressor ( 72 ) pressurizes a portion of the exhaust gas from an internal combustion engine ( 10 ) and supplies it to a mixer ( 40 ). Another portion of the exhaust gas drives the turbine ( 21 ) of a turbocharger ( 20 ), which in turn powers a compressor ( 23 ) that delivers intake air to the mixer ( 40 ). The mixer ( 40 ) combines the air and the recirculated exhaust gas and delivers the mixture to the intake manifold ( 11 ) of the engine ( 10 ). The hydraulically powered turbine ( 71 ) may be driven by any of a number of systems, such as the power steering system of an automobile, high pressure oil from a diesel fuel injection system or an auxiliary hydraulic system. The flow of recirculated exhaust gas may be regulated in any number of manners, such as by controlling the pressure and displacement of the hydraulic pump ( 82 ) or by a valve ( 50 ).

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Citations
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Low emission power generation and hydrocarbon recovery systems and methods

TL;DR: In this paper, a low emission power generation in hydrocarbon recovery processes is described, which uses a hot gas expander and external combustor to compress air in the inlet compressor and generate power using hot carbon dioxide laden gas in the expander.
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TL;DR: In this article, a gas turbine system is configured to stoichiometrically combust a compressed oxidant derived from enriched air and a fuel in the presence of a compressed recycle exhaust gas and expand the discharge in an expander.
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TL;DR: In this paper, a gas turbine system is used to stoichiometrically combust a compressed oxidant and fuel in the presence of a compressed recycle exhaust gas and expand the discharge in an expander to generate a gaseous exhaust stream and drive a main compressor.
References
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Patent

Turbocharging systems for internal combustion engines

TL;DR: In this paper, a two-stage charge air compression system with a turbocharger and a motor-driven compressor was proposed to improve the performance of an internal combustion engine. But the performance was not evaluated.
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Very high speed radial inflow hydraulic turbine

TL;DR: In this paper, a very high speed radial inflow hydraulic turbine drive is presented for supercharging internal combustion engines such as bus and truck turbodiesel engines using a plastic-metal turbine wheel in which the plastic portion of the wheel other than the blades is solidly anchored within a metal containing wheel.
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TL;DR: In this paper, a multistage supercharging system for a reciprocating engine, which is suitable for use in an aircraft capable of flying at high altitude, includes plural stage turbochargers connected in series to each other.
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TL;DR: In this paper, a Coanda effect pump (CEP) was used to provide efficient exhaust gas recirculation (EGR) for internal combustion engines with a primary air inlet (36) receiving pressurized air from a source such as the pressure tank of a truck air brake system.
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TL;DR: A turbocharger system for supplying charge air to a combustion engine includes a non-ventilated hydraulic turbine mounted directly on the turbo-charger shaft, and an auxiliary combustor mounted in-line between the engine and the turbo charger as mentioned in this paper.