METHOD FOR AUTOMATIC SUPPORT OF THE TEMPERATURE MODE OF TECHNOLOGICAL PROCESSES WITH THE USE OF TURBOEXPANDER AGGREGATE ON THE INSTALLATION OF LOW-TEMPERATURE GAS SEPARATION UNDER THE FAR NORTH CONDITIONS Russian patent published in 2019 - IPC F17D5/00 

FIELD: gas industry.

SUBSTANCE: invention relates to the field of production and preparation of gas and gas condensate for long-distance transport. Method involves the separation of gas-liquid mixture coming from the outlet of the separator of the first stage of reduction, into two streams and their supply for pre-cooling through the pipeline to the inlet of the first section of the recuperative gas-to-gas heat exchanger and to the input of the first section of the gas-condensate heat recovery exchanger through the gas flow control valve installed at the inlet of the gas-condensate heat exchanger. This valve-regulator regulates the flow of gas-liquid mixture through the gas-condensate heat exchanger, ensuring the maintenance of the set NGK temperature at the outlet of the second section of the gas-condensate recuperative heat exchanger. After passing through the first sections of the recuperative heat exchangers, both streams of the gas-liquid mixture are combined and fed to the inlet of the TDA turbine. Rotational speed of the turbine is monitored by a TDA rotor speed sensor. Cooled gas-liquid mixture, coming out of the TDA, enters a low-temperature gas separator, equipped with a temperature sensor, in which it is divided into dry cold gas and NGK. Cold NGK is fed to the input of the second section of the recuperative gas-condensate heat exchanger and then through the liquid separator using a pump unit in the MCP. Cold gas released from the low-temperature separator is divided into two streams, one of which is fed to the inlet of the second section of the gas-to-gas recuperative heat exchanger, and the second to the bypass of this section, equipped with a gas flow control valve. This control valve changes the ratio of the gas flow through the recuperative heat exchanger and the bypass, providing real-time correction of the temperature of the gas entering the TDA compressor. In a TDA compressor, the gas is pressurized to the working pressure and set temperature required for supplying it to the IHP.

EFFECT: inventive method allows to maintain a given temperature mode of the technological processes of the installation, ensuring its effective operation; to control and maintain the required temperature of dry gas and NGK, supplied respectively to IHL and MCP, in order to protect permafrost soils from defrosting during the underground laying of gas pipelines in the Far North.

7 cl, 2 dwg