Power plants – Combustion products used as motive fluid – Multiple fluid-operated motors
Patent
1994-01-19
1995-06-20
Casaregola, Louis J.
Power plants
Combustion products used as motive fluid
Multiple fluid-operated motors
60 39465, F02C 322, F02C 600
Patent
active
054252300
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to gas main equipment, more specifically to a gas distribution station with a power plant using the gas energy of the gas main.
PRIOR ART
Known in the art is a gas distribution station comprising a turbo-expander for actuating an electric generator connected at the input to a gas main before a reducer and at the output-behind the latter (Journal "Gazovaya promyshlennost" N II,1988, Moscow, cover page 4).
The conventional installation cannot be used in practice, with a pressure differential>1,5-2 on the reducer (turbo-expander) because of a considerable drop of temperature thereat of natural gas behind the reducer (turbo-expander), and under the strength conditions of gas lines, gas cannot be fed thereinto after reducing at a temperature below 10.degree. C.
And the pre-heating of gas to an initial temperature in a heat-exchanger utilizing the heat of burnt gas reduces utilization to zero, which is why such installations find no application in the given field.
Also known is a gas distribution station comprising a turbo expander for actuating an electric generator, a gas-turbine engine with the electric generator, the heat of whose burnt gases is used for pre-heating the natural gas removed from a gas main before a reducer and fed to the turbo-expander.
Owing to the pre-heating of gas at the input to a turbo-expander of the conventional station, there is increased power generated by the latter as is the gas temperature behind a reducer, which permits expanding the range of its use, including the above-identified pressure differential>1,2-2(EP,A2 No. 0004398).
The conventional station is not efficient enough due to the incomplete utilization of burnt gases because the insulation used on gas pipe lines does not enable one to considerably increase the temperature of said burnt gases behind an expansion valve (over 70.degree. C.) according to strength conditions thereof and also brings about a limitation of the transmissive capacity of the gas pipe line and an increased resistance in the latter due to an increase in the gas volume with its invariable mass flow rate.
SUMMARY OF THE INVENTION
It is the principal object of the present invention to eliminate restrictions of the temperature conditions of a gas pipe line, to enhance efficiency of the power plant of a station and to improve the latter's reliability.
Said object is accomplished owing to the fact that in a gas distribution station with a power plant comprising a gas main with a reducer, a gas--turbine engine with a heat exchanger-utilizer at the output for heating the gas removed from the gas main before the reducer, and a turbo-expander with an electric generator, and along with this, the input of the turbo-expander is connected to the output of the heat exchanger-utilizer, the provision is made of a heat exchanger-regenerator for pre-heating said gas taken away. Moreover, the heat-exchanger-regenerator is mounted before the heat-exchanger-utilizer and connected, as to a heating medium, with its input and output to respectively the output of the turbo-expander and the gas pipe line after the reducer, and as to a heated medium, respectively with the input--to the gas main before the reducer and with the output--to the input of the heat exchanger-utilizer.
In the gas distribution station, a gas turbine engine can be connected kinematically with the electric generator of the turbo-expander.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention is described by a specific embodiment which is diagrammatically illustrated in the sole FIGURE of the drawing by a gas distribution station having a power plant:
DETAILED DESCRIPTION OF A EMBODIMENT OF THE INVENTION
A gas distribution station is shown in the drawing and comprises a gas main 6 with a reducer 7, and a pipe line 8 for the gas to be withdrawn into a power plant, comprising a turbo-expander 1, an electric generator 2, a gas turbine engine 3, a heat exchanger-utilizer 4, and a heat exchanger-regenerator 5.
Natural gas is taken away from the gas main
REFERENCES:
patent: 3107482 (1963-10-01), Fono
patent: 3525218 (1970-08-01), Buss
patent: 4273508 (1981-06-01), Fomichev
patent: 4418530 (1983-12-01), Bodrov et al.
Aktsionernoe Obschestvo "Kriokor"
Casaregola Louis J.
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