Hitachi, Ltd.

Hiroshi Haruyama

Yoshitaka Kojima

Shinya Imano

Hideyuki Arikawa

Kunihiro Ichikawa

Akira Mebata

Hideki Tamaki

Hironori Kamoshida

Terufumi Iwata

An operation control method for a gas turbine includes making a molten salt map of molten salt for causing high-temperature corrosion on high-temperature components of the turbine due to impurities using a thermodynamic equilibrium calculation on the basis of the impurities contained in low-quality fuel and operation data of the gas turbine, indicating a surface temperature and a pressure of the high-temperature components of the turbine on the molten salt map , predicting a lifetime of the high-temperature components of the gas turbine by estimating a corrosion rate thereof, and controlling the flow rate of the low-quality fuel supplied to a combustor so that an area of surface temperature and pressure regions of the high-temperature components superposing on the region of molten salt in the liquid phase on the molten salt map is reduced.

Operation control method for gas turbine and operation controller for gas turbine

A &#x3b3;' phase strengthened Fe&#x2014;Ni base superalloy comprising 1.0 to 3.0 wt % of Nb, 10 to 20 wt % of Cr, 30 to 50 wt % of Fe, 1.0 to 2.0 wt % of Ti, 1.0 to 2.0 wt % of Al, 0.02 wt % or less of C, the balance being Ni and inevitable impurities wherein an area of NbC in a cross sectional structure thereof is 0.4% or less. A hydrogen flow meter for high pressure hydrogen that uses the Fe&#x2014;Ni base superalloy material mentioned above.

&#x3b3; phase strengthened Fe&#x2014;Ni base superalloy

A high-temperature resistant component for, e.g., a gas turbine hot part, includes an alloy substrate containing Ni, Co, or Fe as the principal component, and a thermal barrier coating formed over the surface of the substrate via a bond coat. The thermal barrier coating includes a porous thermal-barrier layer made of ceramic and an environmental barrier layer with corrosion resistance. An impregnated layer is provided between the environmental barrier layer and the thermal barrier layer. In the impregnated layer, the thermal barrier layer is impregnated with a part of the environmental barrier layer. The thermal barrier layer is made of a porous zirconia layer, and the environmental barrier layer includes silica as the principal component. The porous zirconia layer has pores impregnated with the part of the environmental barrier layer. As a result, the high-temperature resistant component has excellent corrosion resistance and excellent heat resistance.

High-temperature resistant component and gas turbine hot part

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Hitachi, Japan

Hiroshi Haruyama