STEAM TURBINES HIGH-TEMPERATURE STUD PINS REFRIGERATION METHOD AND DEVICE FOR ITS ACTUALIZATION Russian patent published in 2018 - IPC F01D5/08 

FIELD: electricity-producing industry.

SUBSTANCE: invention relates to the method and device for the case high-temperature stud pins refrigeration and the flanged joints of the steam turbines of the thermal power stations (TPS, CHP), more specifically for the high-temperature stud pin of the flange connectors of the high-pressure cylinder (HPC) seal, and can be used in the stud pins refrigerating systems of the turbines of a ST-type. The assigned technical problem in the steam turbines high-temperature stud pins refrigeration method, which includes the cooling steam supply along the cooling line from the flowing channel on one side and the cooling steam removal along the outlet line on the other side is achieved by means of the fact that the steam extraction is carried out from the medium or low-pressure stage of the steam turbine with subsequent direction of the extracted steam for the steam turbines high-temperature stud pins refrigeration. Upon that, the extracted steam flow velocity control is effected on account of the isolation valve adjustment on the extraction steam line from the low or medium pressure stage of the steam turbine, and the extracted steam temperature control is effected on account of the steam extraction from the low or medium pressure stage of the steam turbine. Further, the extracted steam is transferred through the cylindrical connecting leg into the cylindrical metal tube of a minor diameter and then after the distribution in a volume the extracted steam runs into the cooling cylindrical conduit, where the extracted steam is supplied through the perforation hole in the cylindrical metal tube of a minor diameter into the cooling cylindrical conduit, where it removes a part of the heat from the internal surface of the external cylindrical tube of a greater diameter and the steam heats up as consequence of the heat loss. At this time, the extracted steam cools down the external cylindrical metal tube walls of a greater diameter, and further, the steam is forced out into the outlet cylindrical connecting leg and further either goes back into the steam turbine plant cycle or to the atmosphere. The cooling cylindrical conduit is formed by two cylindrical metal tubes with bases that have the common normal axis. Along with this, the cylindrical metal tube of a minor diameter has the perforation hole and is linked to the cylindrical connecting leg, and the external cylindrical metal tube of a greater diameter is linked to the outlet cylindrical connecting leg.

EFFECT: reduction in expenditure, thermal efficiency increase.

4 cl, 3 dwg