Hitachi, Ltd.

Hitachi Kizai Kogyo Co. Ltd.

Satoshi Ninomiya

Nobuyuki Iizuka

Katsukuni Hisano

Yasuhiko Otawara

Michio Kuroda

Kiyoshi Namura

Fumio Kato

Yoshiaki Yamazaki

Yasuaki Akatsu

Hidesumi Kuwashima

Katsuto Kashiwahara

Akihiro Yasumoto

Ryosuke Arie

Hiroo Iwase

Daizo Morimoto

Yasuhiro Yamachi

A cross compound turbine apparatus and method of operating the same wherein the apparatus includes a first turbine generator having a high pressure turbine and a first low pressure turbine connected to a first generator driving shaft, with the second turbine generator having an intermediate pressure turbine connected to a second generator driving shaft. Driving steam is supplied to the high pressure turbine and a primary steam line communicates exhaust steam from the high pressure turbine to drive the intermediate pressure turbine during a steady state operation of the first and second turbine generator sections. A bypass steam line communicates steam from the system supplying driving steam to the high pressure turbine to the intermediate pressure turbine in a bypassing relationship to the high pressure turbine. A control arrangement controls the flow of steam in the primary and bypass steam lines during a starting operating of the turbine generator sections, with the control arrangement being adapted to maintain the relative speeds of the first and second generator driving shafts in a predetermined synchronsis ratio. A controllable vent arrangement is provided for venting a portion of the steam flow in the primary steam line during starting operations. By virtue of these features, a speed synchronization of multiturbine sections can be obtained in an efficient and inexpensive manner without causing excessive heat rise in the turbine blades.

Method and apparatus for operating a cross-compound turbine generator

A turbomachine rotor arrangement is provided having a rotor wheel and blades thereon with a tie pin for interconnecting adjacent blades. A plurality of blades respectively define tie holes wherein the tie holes of adjacent blades are disposed with the radial heights of said holes being different and with the tie pin disposed in the tie holes so as to be acted upon by respective different amplitudes of vibration than said adjacent blades during rotation.

Turbine rotor construction

A rotor fixing device for turbines comprising rotor support means independent of the bearing and including an inner ring member split into at least two sections and formed on its inner peripheral surface with grooves complementary with packing teeth formed on an outer peripheral surface of the turbine rotor, and an outer ring member split into at least two sections and secured to a turbine casin for supporting the inner ring member, and means secured to stationary members of the turbine and adapted to be inserted into a space defined between a rotor wheel and a packing case head for constraining axial movement of the turbine rotor. The rotor support means is disposed adjacent each end portions of the turbine rotor. The turbine rotor can be fixedly supported in place in an assembled condition during transportation of the turbine. The rotor fixing device is removed from the turbine after completion of transportation thereof.

Turbine rotor holding device

Improvements in or relating to a reheating steam plant comprising a main steam line connecting a heater to a higher pressure turbine through regulating valves, and a reheated steam line connecting the higher pressure turbine to an intermediate pressure turbine through a reheater, a reheating stop valve and an intermediate stop valve. The improvements consist in the provision of a branch line branching off from the main steam line at a point disposed on the up-stream side of the regulating valves and connected to the reheated steam line at a point interposed between the intermediate stop valve and the intermediate pressure turbine, an adjusting valve mounted in the branching line, and a control for the adjusting valve. The adjusting valve is adapted to be opened when the turbine is under an overload so as to introduce to the intermediate pressure turbine a portion of the steam supplied from the heater.

Method of and device for controlling a reheating steam turbine plant

A seal device for use in the flange mating surfaces of a vacuum container of the type, in which there are provided a first member and a second member, both of which are formed with flanges, respectively, and in which the aforesaid flanges are bolted together so as to maintain the interior of the container to a lower pressure, as compared with the atmospheric pressure. With this type container, the aforesaid bolts are located outwardly on the flange mating surfaces, and a first space is provided on the innermost side of the flange mating surfaces but inwardly of the aforesaid bolts, while a second space is provided thereon between the bolts and the first space. The first space is communicated with steam guide holes provided in either of the aforesaid flanges, while steam guide holes are in communication with a steam generating source so that steam having a pressure higher than the atmospheric pressure outside the container is introduced into the first space. On the other hand, the second space is in communication with steam discharge holes provided in either of the flanges, while the aforesaid steam discharge holes are in communication with a pressure maintaining means adapted to maintain the second space to a pressure lower than the atmospheric pressure outside the container.

Seal device for use in flange mating surfaces of vacuum container

Low pressure turbine installation comprising a casing, at least two groups of turbine stages mounted in said casing, each turbine stage having blades so arranged that a flow of steam passes through the respective turbine stages in contraflow manner, partition means in said casing for separating the opposed final stages of said turbine stages from each other, and steam exhausting means opened in the side walls of said casing in a direction substantially perpendicular to the axis of said turbine, said steam exhausting means being connected to condensers.

Low pressure turbine installation

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Hitachi, Japan

Satoshi Ninomiya