LIQUEFIED NATURAL GAS COMBINED CYCLE PLANT Russian patent published in 2021 - IPC F01K23/10 

FIELD: gas industry.

SUBSTANCE: combined cycle plant running on liquefied natural gas is designed to generate electricity by burning pre-gasified liquefied natural gas (LNG). The installation includes a compressor for compressing atmospheric air; a combustion chamber in which the pre-gasified LNG is burned in compressed air from the compressor; a gas turbine in which the hot gases coming from the combustion chamber expand, generating mechanical power, which is spent on compressing the air in the compressor and driving the gas turbine generator's electric generator, which generates electricity for consumers; a waste heat exchanger for heating the working medium of the organic Rankine cycle due to the heat of the gases leaving the gas turbine; the main exhaust pipe through which the gases cooled in the heat recovery unit are released into the atmosphere; a backup exhaust pipe for exhausting gases from the gas turbine into the atmosphere into the bypass of the heat exchanger; gas valves regulating the direction of gases into the heat exchanger and the back-up exhaust pipe; condensate feed pump of the working medium of the organic Rankine cycle, pumping the liquid working medium from the condenser-gasifier through the heat exchanger-recuperator to the utilizer; a turbine of the working medium of the organic Rankine cycle, which drives the electric generator of the installation of the organic Rankine cycle due to the mechanical power generated during the expansion of the working medium heated in the heat exchanger; a bypass line with an upstream pressure regulator installed on it, through which the working fluid is bypassed into the turbine bypass of the working fluid when the rotational speed of the generator of the Rankine installation is regulated; a heat exchanger-recuperator, in which the liquid working fluid pumped by the condensate feed pump is heated by the steam of the working fluid from the exhaust of the turbine of the working fluid and the steam of the working fluid entering the bypass line; condenser-gasifier, in which the steam of the working fluid after the heat exchanger-recuperator is cooled and condensed, sequentially passing through the tube bundles: non-condensable gas heaters, gasified LNG heaters, the main condenser, LNG evaporators, while the cooling agents of these tube bundles are: non-condensable gases released from steam of the working fluid with deep cooling on beams of LNG evaporators, gasified LNG coming from LNG evaporators, liquid coolant coming from the external environment, boiling LNG; a candle for discharge into the atmosphere of non-condensable gases heated in a non-condensable gas heater; LNG storage tank; a pump for supplying LNG to LNG evaporators installed in the condenser-gasifier; line for supplying gasified LNG to the combustion chamber; an equalizing line with a pressure regulator “after itself”, connecting the line for supplying gasified LNG to the combustion chamber with the LNG storage tank and connected to the upper part of the said tank.

EFFECT: reduced size and cost of heat exchange equipment, increased efficiency as well as increased reliability of the combined cycle plant.

1 cl, 2 dwg