Abstract:
This solid fuel burner (1) is provided with: a nozzle (9) that is provided around the central axis of the burner, that includes a straight tube section (2) having an opening opposed to a furnace (13), and a curved tube section (5) continuous with the straight tube section (2), and that sprays out, from the opening to the furnace (13), a fluid mixture which is of a solid fuel and carrier gas of the solid fuel and which is flowing in the curved tube section (5); a first swirler (6) that gives the fluid mixture a swirl at the burner central axis side of the straight tube section (2); and a second swirler (7) that gives, at the burner central axis side downstream of the first swirler (6), the fluid mixture a swirl opposite to that given by the first swirler (6). The fluid mixture flowing from the curved tube section (5) is moved radially from the central axis by the first swirler (6), and is given a counter-swirl by the second swirler (7) to reduce swirl intensity.
Abstract:
The present invention relates to a cylindrical non-melt and partial melt type entrained flow bed gasifier with one or more burners mounted on the top thereof for supplying pulverized raw coal and oxidizer thereto, wherein each of the burners comprises three or four pipes so as to form a central supplying line for injecting the pulverized coal with a carrier gas into the gasifier, a primary oxidizer annular region around the central supplying line having a plurality of primary oxidizer supplying bores for injecting primary oxidizer vertically or at an angle to the injection region of the pulverized coal supplied through the central supplying line so as to direct the pulverized coal to the central region, and an outer cooling annular region around the primary oxidizer annular region for flowing cooling water, which is operated preferably at a temperature range of 1,250ˆ¼1,450°C, or of 1,150ˆ¼1,500°C according to the properties of the coal. According to the present invention, the pulverized coal and oxidizer are properly mixed, and the pulverized coal is directed towards the middle of the gasifier, so that the reaction is completed with the ash being wholly non-melted or partially melted.
Abstract:
The present invention relates to a cylindrical non-melt and partial melt type entrained flow bed gasifier with one or more burners mounted on the top thereof for supplying pulverized raw coal and oxidizer thereto, wherein each of the burners comprises three or four pipes so as to form a central supplying line for injecting the pulverized coal with a carrier gas into the gasifier, a primary oxidizer annular region around the central supplying line having a plurality of primary oxidizer supplying bores for injecting primary oxidizer vertically or at an angle to the injection region of the pulverized coal supplied through the central supplying line so as to direct the pulverized coal to the central region, and an outer cooling annular region around the primary oxidizer annular region for flowing cooling water, which is operated preferably at a temperature range of 1,250∼1,450°C, or of 1,150∼1,500°C according to the properties of the coal. According to the present invention, the pulverized coal and oxidizer are properly mixed, and the pulverized coal is directed towards the middle of the gasifier, so that the reaction is completed with the ash being wholly non-melted or partially melted.
Abstract:
A combustion burner, wherein there are provided a fuel nozzle (51) through which can be blown a fuel gas that is a mixture of pulverized coal and primary air, and a secondary air nozzle (52) through which can be blown secondary air from the exterior of the fuel nozzle (51). A flame stabilizer (54) is provided toward the axial center at a distal end of the fuel nozzle (51), and a rectification member (55) is provided between an inner wall surface of the fuel nozzle (51) and the flame stabilizer (54), thereby making it possible to achieve an optimal flow of fuel gas that is a mixture of solid fuel and air.
Abstract:
For a device for conveying pneumatically conveyed fuels, in particular solid secondary fuels for burners for rotary kilns, comprising a central conveying pipe (1), which has an open end having an outlet opening (2) for the pneumatically conveyed fuels and an opposite end region, in which the fuels are transferred to the conveying pipe (1), at least one line (6, 7, 9) connected to an air supply opens into the interior of the conveying pipe (1) adjacently to the outlet opening of the conveying pipe (1) such that said line is directed forward at an angle.
Abstract:
In order to provide a pulverized coal burner for an oxyfuel combustion boiler which attains uniform combustion from a pulverized coal burner and which constrains a temperature rise of an oxygen injection nozzle, burner inner and outer cylinders are arranged to penetrate a wind box 2 and come close to a throat portion 3. A pulverized coal feed passage 9 is provided between the burner inner and outer cylinders 4 and 5. A plurality of oxygen injection means 11 are arranged outwardly of the burner outer cylinder 4 so as to directly feed oxygen ahead of the burner outer cylinder 4.
Abstract:
This invention relates to a plasma ignition burner. Said plasma ignition burner comprises at least two stages of burner barrels and a plasma generator for igniting the pulverized coal in a first stage burner barrel of said at least two stages of burner barrels, wherein the burning flame of the former stage burner barrel ignites the pulverized coal in the next stage burner barrel, or further bums with the supplemented air in the next stage burner barrel, characterized in that the axial direction of said plasma generator is parallel to the direction along which the pulverized-coal-contained air flow enters into the first stage burner barrel and at the same time, parallel to the axis of the burner barrels.
Abstract:
A fuel injector (10) for use in a furnace is provided. The fuel injector (10) is used to deliver pulverized fuel to a combustion chamber of a furnace. The structure of the fuel injector (10) facilitates efficient combustion while stabilizing the combustion flame. As a result, a minimal amount of NOX and other undesirable byproducts are released into the atmosphere.
Abstract:
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 nozzle (11) is accelerated by that an additional air nozzle (12) and a separator (35) for separating a flow passage are arranged in the fuel nozzle (11), and the exit of the additional air nozzle (12) is set at a position so as to overlap with the separator (35) when 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 11. An amount of air from the additional air nozzle (12) is varied corresponding to a combustion load. By increasing the amount of air from the additional air nozzle (12) at a low load operation, an oxygen concentration of a circulation flow (19) formed in a downstream portion outside the exit of the fuel nozzle (11) is increased to stably burn the fuel. By decreasing the amount of air from the additional air nozzle (12) at a high load operation, a flame is formed at a position distant from the fuel nozzle (11) to suppress radiant heat received by structures of the solid fuel burner and walls of the furnace.