METHOD FOR OPERATION OF A COMBINED GAS AND STEAM UNIT OF A POWER PLANT Russian patent published in 2023 - IPC F01K23/10 

FIELD: power engineering.

SUBSTANCE: invention relates to power engineering and can be used in thermal power plants. Proposed is a method for operation of a combined gas and steam unit of a power plant, wherein atmospheric air is supplied to the turbocharger of the gas turbine unit and compressed therein to the required pressure; the air compressed in the turbocharger is divided into primary and secondary air; organic fuel, primary air, and desalinated water are supplied into the combustion chamber of the gas turbine unit; the process of burning of the organic fuel is conducted in the combustion chamber, forming the products of combustion and evaporation of the desalinated water heated to a high temperature; the products of combustion of organic fuel and the water vapour are mixed with the secondary air; the resulting gas and vapour mixture is directed to the gas turbine; in the gas turbine, the process of expansion of the gas and vapour mixture is conducted, and the operation of the gas turbine cycle required to drive the turbocharger and the electric generator is completed; the gas and vapour mixture spent in the gas turbine is directed to a waste heat boiler, wherein water vapour is generated in the process of cooling the gas and vapour mixture; the water vapour is fed into the steam turbine, and the exhaust gases are redirected into a waste heat exchanger; in the steam turbine, the process of expansion of the water vapour is conducted, and the effective work of the steam power cycle required to drive the electric generator is performed; the water vapour spent in the steam turbine is redirected to a condenser, wherein the water vapor is condensed in the process of heat exchange with the circulating water; in the waste heat exchanger, in the process of heat exchange with the circulating water, the exhaust gases are cooled below the dew point with condensation of part of the contained water vapour; the desalinated water extracted through the condensation of water vapour from the exhaust gases is directed to the container tank through the condensate collector with a hydraulic seal and therefrom supplied by a pump via a stainless steel pressure main into the combustion chamber of the gas turbine unit; the circulating water heated in the condenser and the waste heat exchanger is supplied to the exhaust tower of the cooling tower by a circulation pump via the discharge pressure main, wherein the circulating water is cooled by atmospheric air in the process of heat and mass transfer in direct contact therewith, and discharged into the water collector; the exhaust gases after the waste heat exchanger are discharged into the atmosphere, and natural gas is used as organic fuel. The monitoring herein is continuous, and the flow rate of desalinated water is maintained at the set level in accordance with the operating mode of the gas and steam unit of the power plant, in the amount of 0.8 to 1.2 kg per 1.0 kg of the organic fuel burned, supplied from the tank container by a pump via a stainless steel pressure main to the combustion chamber of the gas turbine unit, by means of a desalinated water flow rate controller linked with the sensor for the organic fuel flow rate into the combustion chamber of the gas turbine unit and the regulating body installed on the stainless steel pressure main before the pump for the desalinated water supply into the combustion chamber of the gas turbine unit.

EFFECT: increase in the efficiency of operation of the combined gas and steam unit of a power plant.

1 cl, 1 dwg