SU184070A1 - HIGH-TEMPERATURE STEAM-TWO-HEAT TURBINE - Google Patents

Description

Known high-temperature combined-cycle twin-flow turbine with a centripetal wheel having a hollow cooled blades, in which the movement of the flows of wet (superheated) steam and gas separately. However, the high thermal resistance of the metal separating the surfaces washed by the high-temperature gas flow from the surfaces washed by the moistened steam significantly limits the cooling capacity of the working blades even at very high heat transfer rates. The presence of an intermediate working fluid in a dual-circuit cooling system complicates the design and reduces its reliability.

To eliminate the above disadvantages for turbines with simultaneous expansion of the products of combustion and steam in a single flow passage, it is necessary that gas and steam wash the walls forming the working channels on both sides.

In the turbine of the invention, the blades are made up of two halves, which, when coupled, form the entrance slits for directing the flow of cooling steam at different peripheral speeds to the output section of the internal cavity of the blades.

high temperature differential and simplify the co-adjustment of the turbine.

FIG. 1 shows schematically the described gas-vapor turbine; FIG. 2 shows a structural diagram of a turbine blade.

Combustion products having a high temperature enter through the nozzles / into the radially working channels 2. Moving from the periphery to the center, the gases through exit sections 3 fall into a centripetal stage.

Steam (to intensify the cooling process, it is better humidified) is introduced through

nozzles 4 into special radial working channels 5 along which it also moves from the periphery to the center. Next, the steam through the channels 5 in the hollow blade to the window 7 passes into the channel 8 and through the section 9 leaves the radial

stage. When moving from the periphery to the center, the vapor expands and does useful work. From the radial stage, steam and gas can either be directed to the corresponding axial stages, or diverted to other turbines.

providing different velocity circles in the inlet sections.

The radial step is formed by separate blades connected to the disk by a special tail section.

For the passage of steam inside the blade, it is made from two halves that are boiled at the joints. With the help of shelves 10, the gas path is separated from the steam, and the rotor and the turbine housing are completely isolated by the steam flow from the high-temperature gas flow.

To reduce steam leaks into the gas stream, it is necessary that the initial vapor and gas pressures are close enough.

The proposed turbine design eliminates the possibility of large intermediate thermal resistances between gas and vapor streams.

Thin-walled working blades of the gas path throughout the entire internal cavity are washed by a stream of humidified steam, ensuring reliable cooling.

Subject invention

A high-temperature vapor-gas dual-flow turbine contains a body with centripetal wheels located in it, having hollow cooled blades with separate movement of wet (superheated) steam and gas flows, in order to ensure that the maximum thermal difference in the region high temperatures and simplified construction; the blades are made of two halves, which, when coupled, form the entrance slits for directing the flow of cooling steam at different peripheral speeds to Khodnev section of the inner cavity of the scapula.