Power plants – Combustion products used as motive fluid – Combustion products generator
Patent
1988-03-04
1989-10-17
Koczo, Michael
Power plants
Combustion products used as motive fluid
Combustion products generator
60595, 60726, 60729, 123 46R, F02C 300
Patent
active
048738220
DESCRIPTION:
BRIEF SUMMARY
The invention relates to energy producing installations including an internal combustion engine using the diesel cycle, generally two stroke, and a gas turbine, and in particular installations outputting mechanical power between a few MW and a few tens of MW.
At the present time, installations of this type are already in use, in which the gas turbine belongs to a turbocompressor for supercharging the Diesel engine, this latter delivering the output power. Installations have also already been proposed whose Diesel engine is of the crank-connecting rod or free piston type, associated with reciprocating or rotary compressors in which a combustion chamber receives a mixture of exhaust gas from the diesel and air coming from the compressors for feeding a power turbine which delivers all or part of the output power.
The invention aims at providing an installation of the above type answering better than those known heretofor the requirements of practice, particularly in that it allows a high efficiency, a reduced cost per unit of power and great modularity in the range of powers to be obtained at the same time.
To this end, the invention proposes an energy producing installation comprising:
a compression unit formed of at least one Diesel engine supercharged by a turbocompressor which delivers a primary airflow thereto, the excess energy which may be available at the shaft of the turbocompressor being used for increasing the energy produced at the shaft of the Diesel engine which drives reciprocating and/or rotary compressors delivering a secondary airflow, said compression unit being however advantageously formed in a privileged variant by at least one free piston module having two mobile assemblies formed of two opposed drive pistons each connected to a compressor piston, each compressor piston defining two compression units in a compressor cylinder, the drive pistons defining a two stroke Diesel engine chamber, which receives the air called primary airflow delivered by a primary compressor compartment at least, and whose exhaust gases feed the expansion turbine of a turbocompressor having advantageously a primary rotary compressor body supercharging the so called primary compressor compartment or compartments and at least a secondary rotary compression body supercharging that one (or those) of the so called "secondary" compression compartments which do not supercharge the two stroke Diesel engine chamber;
and a power unit including a gas turbine which delivers the whole of the output power at its shaft, itself fed by a combustion chamber which receives all or the major part of the air coming from the secondary compressor compartments or secondary flow.
The module--or each module--of the installation must be provided with a regulating system providing:
control of the amplitude of the stroke of the mobile assembly towards the outside, i.e. of the outward dead center or PME;
control of the amplitude towards the inside, i.e. of the inward dead center or PMI;
control as a function of the power demanded.
The regulation will comply with the above hierarchy; when the installation includes several modules, the system should in addition maintain the phase of all the modules except one (slave modules) with respect to another module taken as reference.
With this arrangement, a great constructional flexibility due to the modular construction is obtained, as well as high efficiency of the compression unit, due more particularly to the direct mechanical connection between drive pistons and compressor pistons, and a reduced specific cost per KW, due particularly to the suppression of the conventional connecting rod assembly of a Diesel engine and of the compressor driven by the turbine (and which entails the power of this latter being multiplied by 2.5) in the case of a conventional gas turbine installation. To sum up, the invention makes it possible to associate the low specific price per kw of the gas turbine with the high thermal efficiency of the diesel, while eliminating to a large extent the drawbacks which the two appr
REFERENCES:
patent: 2653443 (1953-09-01), Mercier et al.
patent: 2711719 (1955-06-01), Huber
patent: 3118434 (1964-01-01), Kosoff
patent: 4481772 (1984-11-01), Benaroya
"Supercharging the Internal Combustion Engine", E. T. Vincent, McGraw-Hill Book Co., Inc., 1948, pp. 287-297.
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