Kureha Kagaku Kogyo Kabushiki Kaisha

Ngk Insulators, Inc.

Chiyoda Chemical Engineering Construction Co., Ltd.

Naoshi Kawabe

Naotaka Miwa

Takeshi Nomura

Hiroshi Hozuma

Hisao Takahashi

Hajime Nakanishi

Masatomo Shigeta

Tomizo Endo

Seiichi Suzuki

Kiyoji Ozaki

Hiroshi Shinoda

Hisatsugu Kaji

Yoshitomo Ohara

Toshikatu Haga

Minoru Akimoto

Takeshi Takahashi

Tatsuya Inoue

Shuji Hayakawa

Fumiaki Tanaka

Taiitu Nakajima

Haruo Izumida

A decoking apparatus suitable for use on a reaction vessel for the thermal cracking of heavy petroleum oils the apparatus essentially including a rotatable main injection pipe to be disposed in the reaction vessel and having a multitude of jet nozzles along its length, and a second or auxiliary injection pipe positioned in the proximity of the main injection pipe to inject a scrubbing liquid over the outer peripheral walls of the main injection pipe to prevent deposition of coke. The main and auxiliary injection pipes are both supplied with heavy petroleum oil to remove the coke deposition from the reactor wall by the heavy petroleum oil jets from the main injection pipe while wetting the exterior of the main pipe with the heavy petroleum oil injected by the auxiliary injection pipe.

Decoking apparatus

A decoking device suitable for use on a reaction vessel for the thermal cracking of heavy petroleum oils, including an assembly mounted on top of the reaction vessel and having a cylinder and a piston slidably and rotatably received in the cylinder, the cylinder and piston defining a scrubbing liquid chamber which is sealed from the outside. A scrubbing liquid is fed through the scrubbing liquid chamber to a main injection pipe to inject the liquid through a multitude of jet nozzles in the main injection pipe against the inner wall surfaces of the reaction vessel, the main injection pipe being connected to the piston for movement therewith.

Disclosed is a method of transporting liquid pitch containing lumpy coke wherein the lumpy coke contained in the liquid pitch is pulverized by a specific procedure and the pitch containing the thus pulverized coke is then transported. Disclosure is also made for a specific apparatus used for the method.

Method of transporting liquid pitch containing lumpy cokes and apparatus

A method of repairing an injured portion of a refractory furnace-lining characterized by cutting off the injured portion of said lining through the furnace shell using a specific supersonic flame jet cutter; inserting a rigid refractory lining block having a shape which is similar to that of the through-cut hole of the furnace body; and welding the surrounding periphery of the inserted block to the contact surface of said through-cut hole using the above-mentioned supersonic flame jet cutter as a welder, followed by repairing the outside cut-off shell portion of the furnace body.

Method of repairing injured portion of refractory furnace-lining

Growing community of inventors

Ichihara, Japan

Naoshi Kawabe