Kabushiki Kaisha Topcon

Mitsubishi Jukogyo Kabushiki Kaisha

Mitsubishi Heavy Industries Limited

Tokyo Kogaku Kikai Kabushiki Kaisha

Tokyo Kogaku Kikai K. K.

Tokyo Shibaura Denki Kabushiki Kaisha

Tokyo Kagaku Kikai K.k.

Kazuaki Kimura

Fumio Ohtomo

Susumu Okino

Toru Takashina

Atsushi Tatani

Naohiko Ukawa

Taku Shimizu

Kiyoshi Okazoe

Eiji Ochi

Masao Hino

Takashi Haruki

Koichiro Iwashita

Satoshi Hirano

Kenji Inoue

Makoto Susaki

Hiroshi Tamaki

Toshikuni Sera

Yasutaka Katayama

Jun Sasagawa

Masana Minami

Shinichiro Kotake

Toyoshi Nakagawa

Tsuneo Sasaki

Makoto Omori

Vernon J Brabec

Kazushige Koshikawa

Kaoru Kumagai

Masaki Iijima

Masaaki Yabe

Masahiro Ohishi

Masakazu Onizuka

Nobuo Hori

Shigeo Hasegawa

Yohei Ogawa

Yoshio Nakayama

Richard W Davidson

Masayuki Kondo

Hiroo Sugai

Ritsuo Sakimura

Shuichi Sasaki

Hiroshi Inaba

Atsushi Yoshioka

Yoshio Horikawa

Satoshi Yajima

Shoichi Onishi

Yoshimitsu Kawanishi

Heiji Tanaka

Kouji Ikeda

Takeshige Saito

Yukio Kitamura

Kazumitsu Suzuki

Yoshiyuki Usami

A gas refining method for adsorbing a reducing gas obtained by pressure gasification of coal or oil comprises introducing a reducing gas stream into an adsorbing and removing zone where it contacts an adsorbent. Sulfur-containing compounds are adsorbed onto the adsorbent and a first oxygen-containing gas stream is introduced into the adsorbing and removing zone in order to form a regeneration gas containing sulfur dioxide. The regeneration gas is contacted with a second oxygen-containing stream and a calcium-containing liquid slurry to effect absorption of sulfur dioxide by the slurry and precipitation of a gypsum compound. The temperature of the slurry is varied to cause selective precipitation of 60 -gypsum hemihydrate or gypsum dihydrate.

Gas refining system

In a flue gas treating system, an absorption tower (), a reheating section () and a fan () are arranged in line on a vertical axis so as to function as at least a part of a stack for emitting the treated flue gas into the atmosphere. Moreover, in a flue gas treating process, the amount of ammonia injected in the denitration step (a denitrator ()) and/or the amount of ammonia at a point downstream of the denitration step are determined so as to be on such an excessive level that ammonia or ammonium salt will remain in the flue gas introduced into the desulfurization step (absorption tower ()). Thus, the size and cost of the equipment can be reduced.

Flue gas treating system and process

Five combustion exhaust gas treatment systems capable of removing dust and selenium (Se) in combustion exhaust gas and making harmless are proposed: (1) combustion exhaust gas is cooled to 350&deg; C. or less, dust is separated, Se is transformed into insoluble compound, and Se is separated; (2) combustion exhaust gas is cooled to 350&deg; C. or less, dust is separated, Se elution preventive agent is added, and dust is formed into scale; (3) dust in combustion exhaust gas is collected by dust collector, dust is formed into slurry by making use of part of circulation liquid in desulfurization apparatus, and tetravalent Se in dust slurry is transformed into insoluble compound, which is separated into solid and liquid; (4) dust is separated from combustion exhaust gas by dust collector, and it is heated to gasify Se, and is led into desulfurization apparatus, etc., and formed into slurry, and Se is made into insoluble compound; and (5) a treating agent for making tetravalent Se insoluble is added to part of circulation liquid in desulfurization apparatus, and it is sprayed into combustion exhaust gas to make Se insoluble.

Combustion exhaust gas treatment system

A laser beam detecting device is disclosed for detecting a laser beam which is emitted from a laser beam generator and which forms a reference plane. A power supply for a laser beam sensor used in the laser beam detecting device is turned OFF automatically when a construction machine with the laser beam detecting device attached thereto is not in operation, while upon operation of the construction machine, the resulting vibration is detected by means of a vibration sensor and the power supply for the beam sensor is turned ON. By so doing, there is attained a superior power saving characteristic and it is possible to effect operation over a long time even with use of cells or a battery.

Laser beam detecting device

The present invention relates to a construction equipment control system, which comprises a plurality of rotary laser irradiating systems for forming laser reference planes by irradiating laser beams by rotary irradiation, a surveying system for measuring positions of the rotary laser irradiating systems, and a construction operation system for controlling and operating construction work of a construction equipment based on the laser reference planes, wherein the construction operation system comprises a photodetection sensor for receiving light beams from the rotary laser irradiating systems as reference positions for the construction operation, a global positioning system (GPS) for detecting a position of the construction equipment, and transmitting structure for transmitting detection results of said GPS to the surveying system, the surveying system comprises transmitting structure for transmitting data relating to the reference planes to be formed based on the results of measurement and results of detection of the GPS to the rotary laser irradiating systems, the rotary laser irradiating systems comprise receiving structure, the receiving structure receives data from the transmitting structrue, the rotary laser irradiating systems form the laser reference planes based on the data, and the construction equipment performs construction work using the laser reference planes as reference.

Construction equipment control system

A displacement measuring appparatus is small in size and hence capable of avoiding interference with other units and further has its measurement accuracy hardly deteriorated. There are disposed pulleys for movement with respect to the body of the appartus and there is disposed an energizing means such that the pulleys are subjected to the energizing force. A wire is passed around the pulleys. When the wire is subjected to a pulling force, the pulleys are moved against the energizing force of the energizing means.

Displacement measuring apparatus

A communication system for a surveying instrument according to the present invention comprises: a tracking target for reflecting tracking light therefrom; a survey unit for emitting the tracking light toward the tracking target and receiving a tracking light reflected from the tracking target using a light receiving device to thereby automatically track the tracking target; a modulator for modulating the tracking light in order to transmit information concerning a surveying work toward the tracking target; a light receiving element provided on the tracking target to receive the tracking light; and a demodulator for demodulating the tracking light received by the light receiving element. The transmission of information concerning the surveying work is carried out through optical communication using the tracking light, and the influence caused by electric wave noises, radio interference and the like can be avoided.

Communication system for surveying instrument

This invention relates to a flue gas treating process including a heat recovery step for recovering heat from flue gas by means of a heat exchanger (,) and thereby cooling the flue gas, and a subsequent absorption step for bringing the flue gas into gas-liquid contact with an absorbing fluid (D) in absorption towers (,) so as to remove at least SO,present in the flue gas by absorption into the absorbing fluid (D), which is characterized, for example, in that a powder addition step for spraying a powder collectable in the absorption step into the flue gas is provided prior to the heat recovery step. This invention makes it possible to provide a flue gas treating process in which a countermeasure against SO,present in flue gas can be easily achieved without resorting to ammonia injection and the flue gas can further be purified without the disadvantage of causing the injected substance to remain in the treated flue gas.

Flue gas treating process and system

An automatic control system for a construction machine includes the construction machine provided with a ground leveling implement, a target, and a laser sensor; a survey unit that has a coordinate position measuring element and projects a beam of tracking light indicating a finished-plane height toward the target; a storage unit for storing finished-plane height data in correspondence with a horizontal coordinate position in the coordinate position; and a computation unit for computing the finished-plane height data. The survey unit is equipped with a rotation unit for rotating the laser beam in a vertical direction so that a height of the laser beam at the horizontal coordinate position becomes a height from a determined finished plane. The construction machine is provided with a control unit for controlling the ground leveling implement so that it reaches the finished-plane height, based on a position at which the laser beam is received on the laser sensor. The computation unit computes a vertical deviation between a predetermined vertical position of the target and an actually measured value thereof.

Automatic control system for construction machinery

Five combustion exhaust gas treatment systems capable of removing dust and selenium (Se) in combustion exhaust gas and making harmless are proposed: (1) combustion exhaust gas is cooled to 350.degree. C. or less, dust is separated, Se is transformed into insoluble compound, and Se is separated; (2) combustion exhaust gas is cooled to 350.degree. C. or less, dust is separated, Se elution preventive agent is added, and dust is formed into scale; (3) dust in combustion exhaust gas is collected by dust collector, dust is formed into slurry by making use of part of circulation liquid in desulfurization apparatus, and tetravalent Se in dust slurry is transformed into insoluble compound, which is separated into solid and liquid; (4) dust is separated from combustion exhaust gas by dust collector, and it is heated to gasify Se, and is led into desulfurization apparatus, etc., and formed into slurry, and Se is made into insoluble compound; and (5) a treating agent for making tetravalent Se insoluble is added to part of circulation liquid in desulfurization apparatus, and it is sprayed into combustion exhaust gas to make Se insoluble.

Flue gas is treated for the presence of SO.sub.3, without resorting to ammonia injection, by adding a powder into the flue gas and subsequently bringing the flue gas into gas-liquid contact with an absorbing fluid, whereby the SO.sub.2 present in the flue gas is removed by absorption into the absorbing fluid. The treatment process may also include introducing the flue gas into a dust collector, whereby dust, including the powder present in the flue gas, is collected, and/or recovering heat from the flue gas by means of a heat exchanger, whereby the flue gas is cooled. A system for treating flue gas is also provided.

Exhaust gas desulfurization system

Growing community of inventors

Tokyo, Japan

Kazuaki Kimura