Babcock-hitachi K.k.

Yuki Kamikawa

Masayuki Taniguchi

Hirofumi Okazaki

Akihito Orii

Hisayuki Orita

Akira Baba

Kouji Kuramashi

Takanori Yano

Hironobu Kobayashi

Kenji Yamamoto

Kenji Kiyama

Toshihiko Mine

Kenichi Ochi

Satoshi Tadakuma

Hiroaki Kanemoto

Hidehisa Yoshizako

Kazumi Yasuda

Shinji Tsuda

Katsumi Shimohira

Shinichirou Nomura

Noriyuki Ooyatsu

A pulverized coal thermal power generation system that significantly reduces the amount of NOx emissions from a boiler and does not require a denitration unit is provided. When a denitration unit is not used, performance to remove mercury from a boiler waste gas is reduced. A waste gas purification system for a pulverized coal boiler, that compensates for this is provided. A pulverized coal boiler having a furnace for burning pulverized coal, burners for supplying pulverized coal and air used for combustion into the furnace so as to burn the pulverized coal in an insufficient air state and after-air ports provided on the downstream side of the burners for supplying air used for perfect combustion characterized in that, an air ratio in the furnace is 1.05 to 1.14, and the residence time of a combustion gas from the burner disposed on the uppermost stage to a main after-air port is 1.1 to 3.3 seconds. Preferably, water is mixed in advance with the air supplied from the after-air port so as to increase the specific heat. Furthermore, pulverized coal carrying air in the burner and a part of air used for combustion are mixed together in advance before they are jetted into the furnace. A waste gas purification system having a pulverized coal boiler, an air heater disposed downstream of the pulverized coal boiler for exchanging heat with a boiler waste gas to heat air used for combustion in the pulverized coal boiler, a dust removing unit, and a desulfurizing unit characterized in that, at least one of a halogen gas supply unit, a catalyst unit for oxidizing a mercury gas, and a mercury adsorbent blowing device is provided so as to oxidize mercury included in the waste gas.

Dust coal boiler, dust coal combustion method, dust coal fuel thermal power generation system, and waste gas purification system for dust coal boiler

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

Growing community of inventors

Hitachinaka, Japan

Yuki Kamikawa