A bale boiler incinerates bales of material, and particularly bales made from waste, garbage and other refuse, in order to provide heat for a steam turbine generator, and includes a conveyor for transporting bales of waste material through a three-stage boiler. The boiler is preferably divided into three stages: 1) the warming stage, 2) the main incineration stage, and 3) the supplemental incineration stage. In the warming stage, the bale is warmed and dried. In the main incineration stage, the bale is burned to create heat that is then used to power a steam turbine electrical generator or the like. In the third, supplemental incineration stage, the remnants of the bale burn down to ash, and the remaining ash and non-combustible waste are then transported out of the boiler by the conveyor and dumped into a receptacle or container for transport and disposal.

A cooking apparatus, having a body defining an interior cooking chamber for cooking food, a pellet supply portion coupled to the body and including a hopper for storing fuel, a combustion chamber for burning the fuel and heating the cooking chamber, a feeding mechanism for supplying fuel from the hopper to the combustion chamber, and a removable collection receptacle located below the combustion chamber. The apparatus also includes an ash-shaker located between the collection receptacle and the combustion chamber, the ash-shaker including an external actuator that controls one or more moving elements located in the combustion chamber, wherein movement of the moving elements encourages unburned debris in the combustion chamber to fall into the receptacle, after which the collection receptacle can be removed and the unburned debris discarded.

The invention relates to a method for operating a fluidized bed boiler (6), comprising the steps of: a) providing fresh ilmenite particles having a shape factor of 0.8 or lower as bed material to the fluidized bed boiler (6); b) carrying out a fluidized bed combustion process; c) removing at least one ash stream comprising ilmenite particles from the fluidized bed boiler; d) separating ilmenite particles from the at least one ash stream, wherein the separation includes a step of using a magnetic separator (12) comprising a field strength of 2,000 Gauss or more; e) recirculating separated ilmenite particles into the bed of the fluidized bed boiler; wherein the average residence time of ilmenite particles in the fluidized bed is 100 h or more.

A rotary air preheater is provided, including: a rotor and a steam soot-blowing device arranged in a cold secondary air inlet channel of secondary air section. The steam soot-blowing device includes a steam sootblower, a first pipe communicating with the steam sootblower and extending in a radial direction of the rotor, and nozzle assemblies communicating with the first pipe. The nozzle assembly includes a first nozzle assembly and a second nozzle assembly, and the first nozzle assembly is located upstream of the second nozzle assembly in a rotational direction of the rotor. The first nozzle assembly includes a sprayer, and diameter of an inlet of the sprayer is smaller than diameter of an outlet thereof. The second nozzle assembly includes at least one nozzle, and steam jet velocity at the outlet of the sprayer is greatly smaller than steam jet velocity at an outlet of the nozzle.

A process for reforming the fly ash, including the heating step that heats a raw fly ash powder containing the unburned carbon at a temperature of 780 to 1000° C. to decrease the amount of the unburned carbon contained in the raw fly ash powder; the classifying step that introduces the heat-treated fly ash containing the unburned carbon in decreased amounts obtained through the heating step into a classifying apparatus in the state of being heated at a high temperature so as to separate the fly ash into a coarse powder and a fine powder; the fine powder recovering step that recovers the fine powder of the heat-treated fly ash obtained through the classifying step by using a dust-collecting apparatus; and the milling step that mills the coarse powder of the heat-treated fly ash obtained through the classifying step until a 45 μm sieve residue becomes not more than 34% by mass, and then recovers the milled powder.

A rotary air preheater is provided, including: a rotor and a steam soot-blowing device arranged in a cold secondary air inlet channel of secondary air section. The steam soot-blowing device includes a steam sootblower, a first pipe communicating with the steam sootblower and extending in a radial direction of the rotor, and nozzle assemblies communicating with the first pipe. The nozzle assembly includes a first nozzle assembly and a second nozzle assembly, and the first nozzle assembly is located upstream of the second nozzle assembly in a rotational direction of the rotor. The first nozzle assembly includes a sprayer, and diameter of an inlet of the sprayer is smaller than diameter of an outlet thereof. The second nozzle assembly includes at least one nozzle, and steam jet velocity at the outlet of the sprayer is greatly smaller than steam jet velocity at an outlet of the nozzle.

A mixer for recirculating ash from solid fuel combustion with hydrated lime and water and to feed the mixture into a desulfurization reactor. The mixer includes a housing having a front wall, two outer vertical sidewalls, a rear wall, a top, and a bottom, the top includes a feed chute configured for the entry and addition of product to the mixer, and the front wall includes an opening for the mixture of product to exit. The mixer also includes a rotatable vertical shaft having an impeller, the impeller having a plurality of blades disposed on the vertical shaft in the same horizontal plane and distributed equidistantly about the circumference of the vertical shaft. The mixer also includes a vertical wall disposed within the housing forming a mixing region and a feeding region that is operably connected to the opening of the front wall.

A fly ash treatment method includes: a setting step: finding out an initial viscosity value of initial fly ash; a pickling operation step: adding the initial fly ash, water and an acid to a pickling tank, uniformly stirring the mixture, and detecting and adjusting a ratio of components of slurry in the pickling tank to conform to a variation of the curve in the heavy metal leaching test curve graph; a first quantitative output step: inputting the slurry into a first buffer tank and quantitatively output the slurry; a first filtration step: filtering fine particles in the slurry output by from the first buffer tank; a drying and pulverizing step: removing water from the slurry passing through the first filter, and performing pulverizing to form powder; and a rotary kiln cracking step: cracking organic matters in the powder by a rotary kiln, and collecting fly ash cinder.

A method facilitates operation of an incinerator for solid fuel. The incinerator includes a device for separating ash from flue gas. The method includes collecting ash deposits originating from the flue gas, resulting in collected ash. To improve the flowability of the ash collected, the method further includes introducing a powdery additive material including i) clay and ii) calcium carbonate into the flue gas. At the location where the additive material is introduced, the flue gas has a temperature of at least 700° C. The additive is introduced with a rate R of at least 0.1 times the mass of ash in the stream of flue gas.

A mixer for recirculating ash from solid fuel combustion with hydrated lime and water and to feed the mixture into a desulfurization reactor. The mixer includes a housing having a front wall, two outer vertical sidewalls, a rear wall, a top, and a bottom, the top includes a feed chute configured for the entry and addition of product to the mixer, and the front wall includes an opening for the mixture of product to exit. The mixer also includes a rotatable vertical shaft having an impeller, the impeller having a plurality of blades disposed on the vertical shaft in the same horizontal plane and distributed equidistantly about the circumference of the vertical shaft. The mixer also includes a vertical wall disposed within the housing forming a mixing region and a feeding region that is operably connected to the opening of the front wall.