Hirakawa Guidom Corporation

Hirakawa Iron Works, Ltd.

Yoshiharu Ueda

Hiroshi Kobayashi

Masamichi Yamamoto

Keiryo Tou

Seikan Ishigai

Sentaro Miura

Kiyoshi Furushima

Atsumi Kaminashi

Masanari Kinoshita

In a combustion device, a boiler is provided with a water tube nest in which combustion, flame holding, fuel-air mixing, and heat absorption are carried out by each water tube in a tube nest. The arrangement of this combustion device enables elimination of the conventional burner and furnace. Fuel supply devices are provided upstream of the water tube nest to supply fuel or a fuel-air mixture. One or several combustion catalysts are provided across the gas flow direction in the boiler to promote combustion. In one arrangement, the fuel supply devices are fuel supply tubes, and fuel or fuel and air are supplied to the fuel supply tubes and spouted from fuel injection nozzles thereof. The fuel supply tubes and water tubes are arranged such that the row of fuel supply tubes is spaced upstream from the first water tube row, such that L.gtoreq.3D where L is the pitch between the fuel supply tube row and the first water tube row, and D is the diameter of the water tubes. Also, P.gtoreq.2D where P is a longitudinal pitch between the water tube rows. A suitable number of fins having a suitable angle and height can be provided on the water tubes and/or the fuel supply tubes. U-shaped or other openings can be made in the fins.

Combustion device in tube nested boiler and its method of combustion

In a combustion device, a boiler is provided with a water tube nest in which combustion, flame holding, fuel-air mixing, and heat absorption are carried out by each water tube in a tube nest. The arrangement of this combustion device enables elimination of the conventional burner and furnace. Fuel supply devices are provided upstream of the water tube nest to supply fuel or a fuel-air mixture. One or several combustion catalysts are provided across the gas flow direction in the boiler to promote combustion. In one arrangement, the fuel supply devices are fuel supply tubes, and fuel or fuel and air are supplied to the fuel supply tubes and spouted from fuel injection nozzles thereof. The fuel supply tubes and water tubes are arranged such that the row of fuel supply tubes is spaced upstream from the first water tube row, such that L.gtoreq.3D where L is the pitch between the fuel supply tube row and the first water tube row, and D is the diameter of the water tubes. Also, P .gtoreq.2D where P is a longitudinal pitch between the water tube rows. A suitable number of fins having a suitable angle and height can be provided on the water tubes and/or the fuel supply tubes. U-shaped or other openings can be made in the fins.

A waste heat recovery method can provide heat recovery from exhaust gases, full firing of exhaust gases, and auxiliary burning, either simultaneously or independently. Such method is carried out by installing a tube-nested (or heat-absorbing water tube furnace-inserted type) combustion chamber in a boiler of a cogeneration system or combined cycle system or the like which generates both heat and power. The boiler is provided with a combined full firing burner and auxiliary burner confronted by the exhaust gas entrance. This structure allows for elimination of a separate auxiliary chamber and thus has made it possible to provide a waste heat boiler of a simplified structure which is smaller in size and thus occupies less space, at a reduced price and with a greatly expanded heat-to-electricity ratio. Accordingly, the boiler of the invention has a greatly extended range of applications.

Exhaust-gas fully fired type boiler and method of waste heat recovery

With a view toward solving various problems of prior-art gas turbine plants by applying a tube-nested combustion chamber type combustor in place of the combustor of the prior-art gas turbine, a combustor of a gas turbine used in a gas turbine power plant is equipped with a heat-absorber-water-tube-inserted combustion chamber in which fuel is burnt with combustion air only. Consequently, the NO.sub.x generated from the gas turbine power plant is notably reduced, no CO and unburnt hydrocarbons (UHC) are produced and, moreover, the amount of power generated and the utilizable calories of the steam are increased for the benefit of an enhanced overall heat efficiency. This enables the combustion space of the gas turbine power plant to be greatly diminished, with a resultant widened utilization range of gas turbines.

Gas turbine system with a tube-nested combustion chamber type combustor

In flue and water tube boilers provided with water tubes arranged in a combustion reaction zone or a convective heating zone, the values of L/D or H/D satisfy the following relationships:

Growing community of inventors

Osaka, Japan

Yoshiharu Ueda