Jgc Corporation

Tokyo Institute of Technology

Kyushu Institute of Technology

Sasakura Engineering Co., Ltd.

Iks Co., Ltd.

Kazutaka Hiraoka

Hiroaki Hasegawa

Nobuo Kakizaki

Shinji Takahashi

Yutaka Tamaura

Takashi Imai

Koji Miyazaki

Atsushi Okita

Kazunori Honda

Nobuyasu Chikamatsu

Masayoshi Ishida

Koji Oyama

Toru Kannari

Yoshiharu Horita

Hirofumi Ito

Tomonori Nakayama

Toshiyuki Nagai

An electric power converter includes a first capacitor being located between an input terminal and an output terminal, and that connects a first terminal being located between the input terminal and a ground, a reactor that connects through electric contact between the first terminal and the output terminal, a switching element that connects through electric contact between the input terminal and the output terminal, and a control unit that executes a first PWM control process controlling a pulse width of the PWM waveform by on and off of the switching device according to the fluctuation of the output voltage, and that executes a second PWM control process widening a pulse width of the PWM and a duty cycle of a PWM than those of the previous cycle when a pulse width becomes a lower limit.

Electric power converter and power amplifier

The present invention provides a steam generator capable of greatly improving energy efficiency, and an energy supply system that uses the steam generator. The steam generator of the present invention includes a high-temperature chamber to which heat of 250&#xb0; C. to 800&#xb0; C. is supplied; a low-temperature chamber arranged adjacent to the high-temperature chamber and configured to produce low-temperature steam of 50&#xb0; C. to 185&#xb0; C. from water using the heat of the high-temperature chamber; and at least one thermoelectric element arranged between the high-temperature chamber and the low-temperature chamber.

Steam generator and energy supply system using the same

A power supply apparatus that receives electric power from a power generation apparatus having a varying output and supplies electric power to an outside, the apparatus comprising: a power storage device that has a larger amount by which electric power is stored and/or a lower self-discharge rate than a capacitor device used as a passive device and also has higher charge and discharge efficiency and/or higher responsiveness than a secondary battery, the power storage device receiving electric power from the power generation apparatus and discharging electric power to the outside; a current control unit that controls a current supplied from the power storage device to the outside; and a control unit that controls a current and a voltage of the power generation apparatus by charging and discharging the power storage device so as to maximize an amount of power generation by the power generation apparatus.

Power supply apparatus, battery apparatus, and battery system

Disclosed is a method for production of lower olefins from a raw material containing dimethyl ether (DME), which can produce lower olefins (e.g. propylene) with good yield and in an economically advantageous manner by prolonging the time until the reversible deactivation of a zeolite catalyst and preventing the irreversible deactivation of the catalyst, can reduce the amount of water to be recycled to increase the thermal efficiency of the process, and can simplify the facilities and operations. Also disclosed is a method for improving the yield of propylene with good efficiency under practical operating conditions. A feed gas which comprises a DME-containing feedstock gas and an additive gas and further contains steam at a specific proportion is introduced into an olefin synthesis reactor to contact the feed gas with a zeolite catalyst, thereby producing a hydrocarbon product containing C2-C5 olefins. Propylene or the like is separated/collected from the hydrocarbon product, and at least a part of the remainder is used as at least a part of the additive gas.

Method for production of lower olefin

Growing community of inventors

Kanagawa, Japan

Kazutaka Hiraoka