Babcock-Hitachi K.k.

Hitachi, Ltd.

Babcock-Hitachi Kabushiki Kaisha

Other

Mitsubishi Hitachi Power Systems, Ltd.

Mitsubishi Power, Ltd.

Hirofumi Okazaki

Kouji Kuramashi

Toshikazu Tsumura

Masayuki Taniguchi

Yoshitaka Takahashi

Kenji Kiyama

Hironobu Kobayashi

Shigeki Morita

Kenji Yamamoto

Akira Baba

Tadashi Jimbo

Takanori Yano

Miki Shimogori

Akihito Orii

Hisayuki Orita

Yusuke Ochi

Shigeto Nakashita

Kunio Hodozuka

Yuki Kamikawa

Keiji Ishii

Osamu Okada

Kenichi Ochi

Toshihiko Mine

Shinichiro Nomura

Satoshi Tadakuma

Hiroaki Kanemoto

Hidehisa Yoshizako

Kazumi Yasuda

Noriyuki Ohyatsu

Hitoshi Kikuchi

Shin-ichiro Nomura

Katsumi Shimohira

Shinji Tsuda

Noriyuki Ooyatsu

Shinichirou Nomura

Kazuhito Sakai

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 overfiring air port of the present invention is to supply an incomplete combustion region with air making up for combustion-shortage, in a furnace in which the incomplete combustion region less than stoichiometric ratio is formed by a burner. Furthermore, the airport is characterized by comprising: a nozzle mechanism for injecting air including an axial velocity component of an air flow and a radial velocity component directed to a center line of the airport; and a control mechanism for controlling a ratio of these velocity components.

Overfiring air port, method for manufacturing air port, boiler, boiler facility, method for operating boiler facility and method for improving boiler facility

A solid fuel burner and its combustion method suited for encouraging fuel ignition and avoiding slugging caused by combustion ash, wherein a gas of low oxygen concentration (exhaust combustion gas) is used as a carrier gas of such a low grade solid fuel as brown coal. An additional air nozzle for jetting additional air having a velocity component in the circumferential direction of a fuel nozzle is provided in the fuel nozzle, thereby encouraging mixing between the fuel and air in the fuel nozzle. Further, the amount of air supplied from the additional air nozzle is adjusted in response to the difference in combustion loads. Under light load, the amount of air supplied from the additional air nozzle is increased so as to increase the oxygen concentration of the circulating flow formed downstream of the outside of the outlet of the fuel nozzle, whereby stable combustion is ensured. Under heavy load, by contrast, the amount of air supplied from the additional air nozzle is decreased, and a flame is formed away from the fuel nozzle in such a way that burner structures and furnace wall will be less subjected to radiant heat.

Solid fuel burner, solid fuel burner combustion method, combustion apparatus and combustion apparatus operation method

A solid fuel burner using a low oxygen concentration gas as a transporting gas of a low grade solid fuel such as brown coal or the like and a combustion method using the solid fuel burner are provided. The solid fuel burner comprises a means for accelerating ignition of the fuel and a means for preventing slugging caused by combustion ash from occurring. Mixing of fuel and air inside a fuel nozzleis accelerated by that an additional air nozzleand a separatorfor separating a flow passage are arranged in the fuel nozzle, and the exit of the additional air nozzleis set at a position so as to overlap with the separatorwhen seeing from a direction perpendicular to a burner axis, and additional air is ejected in a direction nearly perpendicular to a flow direction of a fuel jet flowing through the fuel nozzle. An amount of air from the additional air nozzleis varied corresponding to a combustion load. By increasing the amount of air from the additional air nozzleat a low load operation, an oxygen concentration of a circulation flowformed in a downstream portion outside the exit of the fuel nozzleis increased to stably burn the fuel. By decreasing the amount of air from the additional air nozzleat a high load operation, a flame is formed at a position distant from the fuel nozzleto suppress radiant heat received by structures of the solid fuel burner and walls of the furnace.

Solid fuel burner, burning method using the same, combustion apparatus and method of operating the combustion apparatus

A solid-fuel burner comprising a fuel nozzle for injecting a mixed fluid with a mixture of solid fuel and air as a carrier gas thereof, a plurality of air nozzles provided on the outside of the fuel nozzle for surrounding the fuel nozzle; an end portion of an inner circumferential wall of the air nozzle located at least at the outermost circumference is outwardly expanded, and an inductive member provided at outlet of the air nozzle located at least on the outermost circumference so as to direct flow of air in the direction of outer circumference.

Burner and combustion method for solid fuels

A solid fuel burner and its combustion method suited for encouraging fuel ignition and avoiding slugging caused by combustion ash, wherein a gas of low oxygen concentration (exhaust combustion gas) is used as a carrier gas of such a low grade solid fuel as brown coal. Means for Solving the Subject An additional air nozzlefor jetting additional air having a velocity component in the circumferential direction of a fuel nozzleis provided in the fuel nozzle, thereby encouraging mixing between the fuel and air in the fuel nozzle. Further, the amount of air supplied from the additional air nozzleis adjusted in response to the difference in combustion loads. Under light load, the amount of air supplied from the additional air nozzleis increased so as to increase the oxygen concentration of the circulating flowformed downstream of the outside of the outlet of the fuel nozzle, whereby stable combustion is ensured. Under heavy load, by contrast, the amount of air supplied from the additional air nozzleis decreased, and a flame is formed away from the fuel nozzlein such a way that burner structures and furnace wall will be less subjected to radiant heat.

A solid fuel burner and method uses a low oxygen concentration gas as a transporting gas for a low grade solid fuel such as brown coal or the like, provides for accelerating ignition of the fuel and for preventing slugging caused by combustion ash. Mixing of fuel and air inside a fuel nozzleis accelerated by an additional air nozzleand a separatorfor separating a flow passage, arranged in the fuel nozzle, and an exit of the additional air nozzleis set at a position that overlaps with the separator. Additional air is ejected in a direction nearly perpendicular to a flow direction of a fuel jet flowing through the fuel nozzle. The amount of air from the additional air nozzleis varied corresponding to a combustion load, in order to assure stable burning of the fuel, and, to suppress radiant heat received by structures of the solid fuel burner and walls of the furnace.

Solid fuel burner and method of combustion using solid fuel burner

A combustion method utilizing a pulverized coal combustion burner which is provided with a pulverized coal nozzle for jetting a fluid mixture of pulverized coal and air and an air nozzle for jetting air. In the method, a combustion flame formed by the pulverized coal combustion burner forms a first zone of a gas phase air ratio of one or less at a radially central portion of the flame and a second zone of a gas phase air ratio of more than one outside of the first zone adjacent the coal nozzle, and a third zone of a gas phase air ratio of one or less at a downstream side from said first and second zones.

Pulverized coal combustion burner and combustion method thereby

A pulverized coal burner includes a pulverized coal nozzle for jetting a mixture of pulverized coal and primary air, a secondary air nozzle and a tertiary air nozzle, concentrically arranged around the outer periphery of the pulverized coal nozzle, and a tube expanded portion at the end of a partition wall separating two adjacent air nozzles. A flow shift means such as a guide plate for shifting the secondary air in the secondary air nozzle so as to flow along the tube expanded portion is provided. The secondary air is jetted outwardly by the guide plate, and mixing of the secondary air and the tertiary air with pulverized coals is delayed, whereby an amount of NOx is decreased.

Pulverized coal burner

A combustion apparatus including a mixture feeding pipe for injecting a mixture of pulverized coal for combustion air into a furnace, with the mixture being then ignited. A first gas feeding passage is disposed outwardly of the mixture feeding pipe for feeding oxygen-containing gas into the furnace, with a second gas feeding passage being disposed between the gas feeding passage and the mixture feeding pipe, in a radial direction, for feeding the oxygen-containing gas into the furnace. A projection is disposed between the gas feeding passage and the mixture feeding pipe and extends at an exposed end surface thereof into the furnace beyond an exposed end of the mixture feeding pipe, with the projection being hollow for allowing the oxygen-containing gas to flow within the projection.

Combustion apparatus

Growing community of inventors

Kure, Japan

Kouji Kuramashi