Babcock-hitachi Kabushiki Kaisha

Mitsubishi Hitachi Power Systems, Ltd.

Babcock-hitachi K.k.

Hiroaki Kanemoto

Yutaka Takeno

Hidehisa Yoshizako

Hideo Mitsui

Teruaki Tatsuma

Takashi Harada

Masayuki Taniguchi

Hirofumi Okazaki

Hironobu Kobayashi

Akira Baba

Yoshitaka Takahashi

Toshikazu Tsumura

Akihito Orii

Kouji Kuramashi

Takanori Yano

Hisayuki Orita

Toshihiko Mine

Shinichiro Nomura

Satoshi Tadakuma

Yoshinori Ohtani

Yuki Kamikawa

Takashi Aizawa

Shinji Tsuda

Yoshio Shimogori

Taketoshi Tanabe

Noriyuki Ooyatsu

Shinichirou Nomura

Yoshinori Otani

Katsumi Shimohira

Provided is a vertical pulverizing apparatus capable of suppressing abrasion of throat vanes () and elongating their abrasion resistant lives to thereby increase working efficiency. The vertical pulverizing apparatus is characterized in that: a throat () is provided between a housing () and a pulverizing table () and has an annular flow channel which is surrounded by a throat inner peripheral wall () and a throat outer peripheral wall () and which is partitioned by a large number of throat vanes (); and a slope part () extending diagonally downward from an inner peripheral wall surface of the housing () toward a top end of the throat outer peripheral wall () and a horizontal part () extending from a bottom end of the slope part () continuously to the top end of the throat outer peripheral wall () are provided so that top end surfaces () of the throat vanes () and a top surface of the horizontal part () can be set at the same height.

Vertical pulverizing apparatus

To provide a classification device in which product fine powder little in mixture ratio of coarse particles can be obtained. A classification device characterized in that a setting pitch P between stationary finsand a width L of each stationary finare combined so that a value of P/L is in a range between 0.042&#xd7;(&#x3b8;&#x2212;50)+0.64 and 0.019&#xd7;(&#x3b8;&#x2212;50)+0.22 in 50&#xb0;&#x2266;&#x3b8;&#x2266;70&#xb0; when &#x3b8; is an inclination angle of each stationary fin, P is the setting pitch, and L is the width in a direction of circulation of particles.

Classification device, vertical pulverizing apparatus using the same, and coal fired boiler apparatus

A pulverized coal-fired boiler efficiently supplies air to a central part of a furnace and the neighborhood of a furnace wall, thereby promoting mixture with combustion gas, and reducing both NOx and CO. The main after air ports are structured so as to jet air having a large momentum for enabling arrival at the central part of the furnace, and the sub-after air ports are structured so as to jet air having a small momentum to the neighborhood of the wall face of the furnace, and a sectional center of each of the sub-after air ports is within a range from 1 to 5 times of a caliber of the main after air ports from a sectional center of each of the main after air ports.

Pulverized coal-fired boiler and pulverized coal burning method

A classifier capable of stably providing particles by further reducing the mixing ratio of coarse particles including a rotating fin () classifying solid particles by a centrifugal force, a cylindrical downward flow forming member () installed on the outer peripheral side of the rotating fin (), a recovery cone () disposed under the rotating fin () and the downward flow forming member (), and a housing (). A contraction flow area () is formed between the housing () and the recovery cone (), and a two-phase flow () formed of the mixture of the solid particles and gases blown up through the contraction flow area () is collided with the downward flow forming member () on the upper side of the housing () to form it in a downward flow. Then, that flow is led to the rotating fin side, classified into the fine particles and the coarse particles, and the fine particles are carried together with an airstream, passed through the rotating fin (), and removed. A circulating swirl flow development suppressing part () is installed at the upper part of the contraction flow area () and on the outer periphery of the downward flow forming member ().

Classifier, vertical crusher having the classifier, and coal fired boiler apparatus having the vertical crusher

A fuel supply duct, which supplies a mixed fluid of a solid fuel and carrier gas to one or more burners provided on the walls of a furnace, is provided with a branching part, and each of a plurality of branch ducts, which branch out from the branching part, is connected to a corresponding burner. Also a damper, with which the tilt angle with respect to the direction of flow of the mixed fluid can be changed, is positioned in the fuel supply duct at the upstream side of the branching part so that a mutual difference will arise in the solid fuel concentrations of the mixed fluid supplied to the respective branch ducts. A fuel distributor for fuel supply duct is thus arranged. The tilt angle of the above-mentioned damper is adjusted to increase the concentration of solid fuel in the mixed fluid supplied to a specific burner. At a burner to which the high solid fuel concentration is supplied, stability of ignition and stable combustion of the ignited flame can be obtained during low load operation.

Fuel distribution device for fuel feed ducts and method of operating distribution device

Growing community of inventors

Kure, Japan

Hiroaki Kanemoto