Fuji Electric Co., Ltd.

Geothermal Engineering Co., Ltd.

Nikkiso Company Limited

Fuji Electric Systems Co. Ltd.

Ichiro Myougan

Yasuyuki Hishi

Toshiaki Aoki

Daisuke Fukuda

Toshikazu Kato

Yoshitaka Kawahara

Shinya Ui

Kohei Inoue

Isamu Osawa

Yasuto Futagoishi

Provided is a steam characteristics automatic measuring device capable of automatically, ideally also continuously measuring the characteristics of steam taken from a production well, without being affected by interfering components, such as hydrogen sulfide gas and carbon dioxide gas contained in large quantities in steam taken from under the ground, which enables the operator to continuously understand the characteristics of steam and support a smooth operation of a geothermal power plant. The device has a silica monitor for measuring a concentration of silica included in a condensate obtained by cooling steam taken from under the ground; an electrical conductivity meter for automatically measuring the electrical conductivity thereof; a pH meter for automatically measuring the pH value thereof; and a data processing transmitter for automatically transmitting data measured by each of the monitor and meters. A geothermal power-generating device equipped with the steam characteristics automatic measuring device is also provided.

Steam characteristics automatic measuring device and geothermal power-generating device

A scale inhibition method for injecting an alkaline agent and a chelating agent into a fluid containing at least silica and calcium ions, and inhibiting generation of scale, includes feeding the chelating agent and the alkaline agent into piping channeling the fluid, mixing the fluid while causing the fluid to flow in a chemical-mixing part provided in the piping, and when either a pressure difference between the pressures or a flow rate difference between the rates of fluid flow at an inlet and an outlet of the chemical-mixing part exceeds a preset upper threshold, increasing the amount of the chelating agent fed, and feeding the chelating agent at an increased feed amount until the pressure difference or flow rate difference falls below a preset lower threshold.

Method for inhibiting scale and geothermal power generating device

An online diagnostic system for a geothermal generation facility is discloses that includes an automatic steam measurement device for measuring a characteristic of steam to be supplied to a steam turbine from a steam-water separator at the geothermal generation facility that outputs analysis data. A monitor-control device controls an operation of the geothermal generation facility while monitoring the geothermal generation facility. A diagnostic device performs at least one of an evaluation of a steam characteristic at the geothermal generation facility, an evaluation of the steam-water separator, and an evaluation of pulsation and confluence of a production well based on the analysis data from the automatic steam measurement device and performance data of the geothermal generation facility from the monitor-control device. An operating status of the geothermal generation facility is diagnosed.

Online diagnostic method and online diagnostic system for geothermal generation facility

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Yokohama, Japan

Ichiro Myougan