Ohkawara Kakohki Co., Ltd.

Shizuo Aishima

Masaaki Ohkawara

Toshiyuki Tanaka

Takashi Itoh

Takashi Ito

Akira Kodera

Gentaro Nemoto

Masashi Fujii

Masaki Kosemura

Munetoshi Maesaka

Takahito Goshi

Kazukuni Furukawa

Yoshito Takahashi

A method and apparatus of cooling incinerator exhaust gas for a cleaning treatment of high temperature exhaust gas discharged from an incinerator of refuse and/or waste in a post-step are provided. A spray cooling chamber includes a chamber having a lower end portion formed into a nearly cylindrical shape of an inverted conical shape, a gas distribution chamber equipped with a revolving blade, arranged at an upstream side of the chamber, a sprayer of a cooling liquid arranged at central upper portion of the chamber, a dust exhaust port arranged at the lower end portion of the chamber, and an exhaust pipe arranged on the chamber. Waste heat recovery from exhaust gas is limited to a temperature range capable of suppressing generation of dioxins, and high temperature exhaust gas is rapidly cooled, particularly at a temperature drop rate such that the vicinity of 300.degree. C. is dropped in a short time within 1 second, so that exhaust concentration of dioxins from an incinerator plant can be decreased to 0.1 ng-TEQ/Nm.sup.3 or less.

Method and apparatus of treating incinerator exhaust gas

A nozzle unit having a pressure nozzle for spraying feed liquid and a cylindrical outer tube disposed around the pressure nozzle for high-speed gas blowing. The tip of the nozzle unit is of converging construction. When water is sprayed at low pressure in the nozzle unit, water is atomized to fine droplets.

Spray nozzle unit

The present invention provides a spray-drying granulation apparatus having a chamber comprising (a) an upper section which is a spray-drying section for spraying a feed solution from a nozzle and drying the formed droplets with hot air and (b) a lower section which is a fluidized granulation section, in which apparatus there is used, as the nozzle for spraying a feed solution, a two-fluid pressure nozzle comprising a centrifugal pressure nozzle for spraying a feed solution and a cylindrical pipe for blowing out a high-speed gas, provided around the centrifugal pressure nozzle. This spray-drying granulation apparatus enables spraying of even a feed solution of large volume with only one nozzle. Further with the two-fluid pressure nozzle of the apparatus, there is no need of replacement of nozzle parts when the feed rate, concentration, viscosity, kind, etc. of the feed solution are changed greatly, because the diameters of droplets formed by spraying can be controlled by controlling the speed of the high-speed gas, while in the conventional nozzles the replacement of nozzle parts such as orifice, core and the like has been necessary when the above change is made.

Spray-drying granulation apparatus

The injection type nozzle of the present injection is a two-fluid pressure nozzle comprising a centrifugal pressure nozzle for spraying a feed liquid and a cylindrical pipe for blowing out a high-speed gas, provided around the centrifugal pressure nozzle, said two-fluid pressure nozzle having a tapered structure at the front end portion and said cylindrical pipe for blowing out a high-speed gas, having air-purging through-holes at the front end portion. The spray dryer of the present invention comprises a drying chamber, the above two-fluid pressure nozzle provided at the bottom of the drying chamber with the nozzle tip directed upward, an inlet for feeding a hot gas into the drying chamber, and an outlet for driving an exhaust gas out of the drying chamber. The spray dryer employing a closed system according to the present invention comprises a drying chamber, the above two-fluid pressure nozzle provided at the bottom or top of the drying chamber with the nozzle tip directed upward or downward, an inlet for feeding a hot gas into the drying chamber, and an outlet for driving an exhaust gas out of the drying chamber, in which spray dryer the hot gas for drying fed into the drying chamber and/or the high-speed gas for atomization is fed by circulating the whole or part of the exhaust gas after spray drying. In the two-fluid pressure nozzle of the present invention, diameters of droplets formed can be controlled by controlling the flow speed of the high-speed gas for atomization.

Two-fluid pressure nozzle of upward injection type, spray dryer using

Process for producing microcapsules. Wax or a mixture of wax and protein is dissolved in a mixed solvent consisting of an organic solvent and water, the surfaces of particles of a core substance are wetted with the resulting solution at temperatures of 45 deg.C or below to selectively deposit the wax or the mixture of wax and protein on the particle surfaces and allow them to coat the particle surfaces. And then a slurry containing the particles is subjected to a solvent removal treatment.

Growing community of inventors

Yokohama, Japan

Shizuo Aishima