Nippon Sanso Corporation

Nkk Corporation

Toshio Suwa

Nobuaki Kobayashi

Yoshiteru Kikuchi

Yoshiaki Konagaya

Atsushi Inoue

Hiroshi Ishii

Hideyuki Honda

Yasuyuki Yamamoto

Shinichi Miyake

Fumitaka Endoh

Maya Yamada

Shuichi Koseki

Hiroshi Igarashi

Kimio Iino

Akihiko Nitta

Naoji Konno

An apparatus for melting a metal provided with a metal melting furnace ( ) for melting a metallic raw material with a flame of an oxygen fuel burner ( ) to which oxygen is supplied as a combustion assisting gas; and an oxygen supply source for supplying oxygen as a combustion assisting gas to the oxygen fuel burner ( ). The metal melting furnace ( ) has a preheating section ( ) for preheating the metallic raw material above a melting section ( ) to which the oxygen fuel burner ( ) is attached and a reduced section ( ) located between the melting section ( ) and the preheating section ( ), the reduced section having an inside diameter smaller than those of the melting section and preheating section. The oxygen supply source is a pressure swing adsorption separator ( ) employing an adsorbent which adsorbs preferentially atmospheric nitrogen and supplying a low-purity oxygen having an oxygen content of 65 to 94% to the oxygen fuel burner ( ).

Method for melting metals

Combustion type harmful substance removing apparatus

Melting furnace of metals and melting method thereof

Disclosed is a method of melting a metal. In a melting furnace, a metallic material is melted by heating it directly with the flame from a fuel burner using an oxygen gas having a purity of 60 to 100% as a combustion assisting gas. Meanwhile, the combustion assisting gas is heated before it is fed to the burner.

Method of melting metals

Disclosed is a method of melting a metal, which can demonstrate improved heat efficiency, increased yield and minimized pollutive gas generation. In this method, a metallic material stacked in a melting furnace is melted by heating it directly with the flame from a fuel burner using an oxygen gas having a purity of 60 to 100% as a combustion assisting gas. The oxygen gas is burned at an oxygen-to-fuel ratio of 0.55 to 0.99, while the unburned portion of the combustion gas is allowed to burn by O.sub.2 supplied separately through oxygen lances. Meanwhile, the metallic material is preheated by burning the unburned portion of the combustion gas, whereas the combustion assisting gas is heated before it is fed to the burner.

A burner for flame-spray coating, being capable of sufficiently high flame temperature and being capable to flame-spray powder material of high melting point by using such fuel gas as C.sub.3 H.sub.8 or C.sub.4 H.sub.10 with high efficiency of deposition, having a gas-powder stream supplying conduit connectedly arranged at the rear portion of a pre-mix combustion chamber, from where gas-powder stream being jetted into the chamber, characterized that at least a series of auxiliary combustion gas (oxygen, oxygen enriched air) supplying passages are annularly provided on the conical wall face of said chamber with the direction of converging toward an opening for flame jet and the axis of the pre-mix combustion chamber.

Burner for powder spray coating

A method for supplying raw powder material such as metal, intermetallic compound or ceramics to a spray coating burner wherein fuel gas or auxiliary combustion gas or their mixed gas is used as jet gas, any one of these gases is introduced under control of the flow rate thereof into a suction chamber of an ejector to serve as suction gas whereby the supply amount of said raw powder material to be fed to said spray coating burner can be controlled.

Method for supplying powder to be used in home spray coating operation

Growing community of inventors

Yamanashi, Japan

Toshio Suwa