Hitachi, Ltd.

Hitachi Engineering Services Co., Ltd.

Hitachi Engineering Service Co., Ltd.

Akira Okabe

Hiraku Ikeda

Zenji Yamaguchi

Akiyo Ichihashi

Haruo Urushidani

Katsuto Kashiwahara

Tooru Horie

Kinichi Suzuki

An answer system for technical support comprises an web server for receiving information of an inquiry sent from a user via an internet; an inquiry-information data base for storing the inquiry information which has been received by the web server; a fire wall for preventing the information of the inquiry, which is stored in the inquiry-information data base, from being accessed by outsiders via the telecommunication network; an intranet for communicating the information of the inquiry, which is stored by the web server, to an information service furnisher; an input unit for inputting an answer to the information of the inquiry, which has been communicated via the intranet; and a mail server for sending the answer to the information of the inquiry, which has been input by the input unit.

Answer system for technical support, and technical support method

The remote monitoring diagnostic system and method includes a data storage file used to collect the plant data representing the operation status of a plant and to store the plant data, a monitoring system to monitor the field plant according to the collected plant data, a database storing the past plant data associated with errors having occurred to the plant and actions taken to cope with the errors, a diagnostic system to analyze the plant data sent according to the database, and a reporting system to send a report to the user of the plant regarding the causes for the error and/or actions taken to cope with the error based on the result of the analysis. An error is judged in a combustor, when a difference in temperature of two exhaust gas temperature datum detected from adjacent combustors is larger than a predetermined value.

Remote monitoring diagnostic system and method thereof

The present invention comprises a data storage file used to collect the plant data representing the operation status of a plant and to store the plant data, a monitoring system to monitor the field plant according to the collected plant data, a database storing the past plant data associated with errors having occurred to the plant and actions taken to cope with the errors, a diagnostic system to analyze the plant data sent according to the database, and a reporting system to send a report to the user of the plant regarding the causes for the error and/or actions taken to cope with the error based on the result of the analysis.

A combined plant comprising a gas turbine, a waste heat recovery boiler using exhaust gases of the gas turbine as a heat source and including low pressure and high pressure steam generators and a steam turbine arranged to be driven by the steam supplied from the boiler, the gas turbine and the steam turbine being connected by a single shaft. At the time of plant startup, low pressure steam from the low pressure steam generator is introduced into the steam turbine prior to the generation of high pressure steam, thereby preventing the steam turbine from being overheated due to a windage loss.

Apparatus for cooling steam turbine for use in single-shaft combined

A combined plant including a gas turbine, a steam turbine and a waste heat recovery boiler using exhaust gases of the gas turbine as a heat source for producing steam serving as a drive source of the steam turbine further includes an ancillary steam source separate from and independent of the waste heat recovery boiler. At the time of startup of the plant, steam from the ancillary steam source is introduced into the steam turbine until the conditions for feeding air to the waste heat recovery boiler are set, to thereby avoid overheating of the steam turbine due to a windage loss.

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Hitachi, Japan

Akira Okabe