Mitsubishi Heavy Industries Limited

Mitsubishi Hitachi Power Systems, Ltd.

Tatsuaki Fujikawa

Shin Nishimoto

Yoshinori Tanaka

Ryuichi Yamamoto

Takashi Nakano

Yasuoki Tomita

Kenji Kawasaki

Masamitsu Kuwabara

Shunsuke Torii

Ryotaro Magoshi

Yoshikuni Kadoya

Naoto Tochitani

Yuichi Hirakawa

Takashi Shige

Shinichi Inoue

Junichi Ishiguro

Shigehiro Shiozaki

Yoshiyuki Morii

Kotaro Ohshima

A steam turbine of an opposed-current single-casing type has a high pressure turbine part and an intermediate-pressure turbine part housed in a single casing. A dummy ring partitions the high-pressure turbine part and the intermediate-pressure part, and a cooling steam supply path and a cooling steam discharge path are formed in the dummy ring in the radial direction. Extraction steam or discharge steam of the high-pressure turbine part, whose temperature is not less than that of the steam having passed through a first-stage stator blade, is supplied to the cooling steam supply path. The cooling steam is fed throughout the clearance to improve the cooling effect of the dummy ring and a turbine rotor. The cooling steam is then discharged through a cooling steam discharge path to a discharge steam pipe which supplies the steam to a subsequent steam turbine.

Method and device for cooling steam turbine generating facility

It is intended to effectively cool a dummy ring and a rotor disposed on the inner side of the dummy ring of a single-flow turbine and to suppress a decrease in thermal efficiency by preventing main steam from leaking to the dummy ring side. A cooling steam supply pipeis provided in the dummy ringof the single-flow turbineA and extraction steam of a boiler at 570&#xb0; C. or below is supplied to a clearance c between the dummy ringand the turbine rotoras cooling steam S. The cooling steam Shas lower temperature and higher pressure than leak steam Swhich is a portion of the main steam Sleaking to the dummy ringside. By supplying the cooling steam S, the leak steam Sis prevented from entering the dummy ringside and the dummy ring, a welding part w and a second rotor partwith low heat resistance that are disposed on the inner side of the dummy ringcan be cooled.

Cooling method and cooling device for a single-flow turbine

A turbine rotor which is composed by connecting Ni-based alloy and heat resisting steel such as 12-Cr steel by welding to be able to ensure strength of welded parts and can be used under steam conditions of 700&#xb0; C. class and method of manufacturing the rotor are also provided. The rotor of the rotating machine into which working fluid of 650&#xb0; C. or higher is introduced, the rotor being composed of a plurality of members connected by welding such that material of each member is different in accordance with temperature of working fluid which flows contacting the members, wherein the first member(s) is formed from Ni-based alloy having mean linear expansion coefficient of 12.4&#xd7;10/&#xb0; C.&#x2dc;14.5&#xd7;10/&#xb0; C., preferably 14.0&#xd7;10/&#xb0; C. or smaller within a temperature range from a room temperature to 700&#xb0; C. and second member(s) is formed from high-chrome steels, and the rotor is composed such that the first member(s) formed from Ni-base alloy is located in a portion which contact to the working fluid of 650&#xb0; C. or higher.

Rotor of rotating machine and method of manufacturing the rotor

A steam turbine facility suppresses the possibility of vibration from occurring and prevents a drastic increase in facility cost, thereby realizing an increase in size of the facility, even if steam conditions of 650&#xb0; C. or higher are adopted. In the steam turbine facility including a high-pressure turbine, an intermediate-pressure turbine, and a low-pressure turbine, the intermediate-pressure turbine is separated into a first intermediate-pressure turbine on a high-temperature and high-pressure side and a second intermediate-pressure turbine on a low-temperature and low-temperature side. At least any one of the rotors and casings of the steam-introduction-side turbines into which steam with a temperature of 650&#xb0; C. or higher is introduced is formed from Ni-based alloy, and at least any one of the overall rotors and the overall casings of the turbines are constructed by joining together a plurality of rotor members or casing members by welding.

Steam turbine facility

There are provided an Ni-based alloy high-chrome steel structure and its manufacturing method capable of joining Ni-based alloys and high-chrome steels by welding, and performing suitable heat treatment, thereby maintaining the strength in the joints. In a manufacturing method of a structure formed by joining together at least two first members formed from Ni-based alloys by welding, and joining a second member formed from high-chrome steels to a member where the first members have been joined together, the manufacturing method includes the steps: joining together the at least two first members formed from Ni-based alloys by welding; performing first-stage aging treatment on a welded joint between the first members, and then, joining the second member formed from high-chrome steels to the member where the first members have been joined together by welding; and then, performing second-stage aging treatment on the welded joint between the first members, and performing heat treatment after welding on a welded portion between the first members and the second member.

Ni-based alloy high-chrome steel structure and manufacturing method of the same

The division wall is made up of a plurality of division wall sections forming a passage wall of high temperature gas which are connected in the direction of arrangement of blades to form a wall surface having a roughly circular cross section as a whole, a gas flow restricting structure for preventing high temperature gas from passing through a gap formed at a connecting portion between the division wall sections in the flow direction of the high temperature gas from the opening on the upstream side of the high temperature gas in the gap, or a gas flow restricting structure for preventing the high temperature gas from being embraced in the gap, for example, a sealing member formed into a prism having a T-shape cross section as a whole composed of a plane portion as a sealing portion and a projected portion for filling the gap is provided.

Division wall and shroud of gas turbine

In the gas turbine split ring, on an outer peripheral surface between two cabin attachment flanges, a circumferential rib which extends in the circumferential direction and an axial rib which extends in the axial direction and has a height taller than that of the circumferential rib are, respectively, formed in plural lines, so that it is possible to suppress heat deformation in the axial direction which largely contributes to reduction of the tip clearance compared to head deformation in the circumferential direction more efficiently.

Gas turbine split ring

Growing community of inventors

Tokyo, Japan

Tatsuaki Fujikawa