Abstract
Helium Turbine is used in High Temperature Reactor Helium Gas Turbine (HTR-GT) system, by which the direct helium circulation between the reactor and turbine generator system will come true. Between helium turbine and generator, there is gearbox device which reduces the turbine rotation speed to normal speed required by the generator. Three optional gearbox schemes are discussed. The first is single reduction cylindrical gearbox, which consists of one high speed gear and one low speed gear. Its advantage is simple structure, easy to manufacture, and high reliability, while its disadvantage is large volume and misalignment of input and output axle. The second is planetary gear mechanism with static planet carrier. The third is planetary gear mechanism with static internal gear. The latter two gearbox devices have similar structure. Their advantage is small volume and high reduction gear ratio, while disadvantage are complicated structure, many gears, low reliability and low mechanical efficiency.
Highlights
The 10 MW High Temperature Gas-cooled Test Reactor (HTR-10) has been built and come critical in 2000
Helium Turbine is used in High Temperature Reactor Helium Gas Turbine (HTR-GT) system, by which the direct helium circulation between the reactor and turbine generator system will come true
The coolant helium in primary circuit flows to evaporator, in which water vapor is produced and decay energy is transferred from helium to water vapor
Summary
The 10 MW High Temperature Gas-cooled Test Reactor (HTR-10) has been built and come critical in 2000. Helium with high pressure, heated in the nuclear reactor core, flows from the reactor to the turbine and drives it. The off-gas from the turbine is still hot and will flow through recuperator, where heat is transferred to helium at high pressure side. The preheated high pressure helium flows to the reactor core and is heated again. The function of gear box is transferring the rotation energy of helium turbine to rotor of generator, reducing rotation speed to normal electric network frequency, and supporting the rotor of generator. The pressure in gearbox is 0.7 MPa, while temperature is 65 ̊C The differences between this gearbox and other normal industrial gear box are high rotation speed, high power transfer, and vertical layout. The gearbox in HTR-GT is installed vertically, that is the axle of gear box is perpendicular to ground
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