The present invention relates to an airflow delivery device. The device is designed to allow users to stoke a fire from a safe distance without having to add wood, cardboard, or other flammable materials. Specifically, the airflow delivery device is designed to extend into the base of a fire and provide airflow. The device comprises an outlet-operated fan to create airflow, and a copper tube having an opening on its top surface for allowing the fan to blow air into the bottom of the fire. Users can insert the tube into the base of the fire pit and activate the device when desired. Air is forced from the device, through the tube, and into the fire at a safe distance.

A floor and an upright sidewall formed from two vertically coaxial components, each component having a floor baffle with a plurality of floor openings defined therein, each floor retained within a respective upright sidewall with a plurality of sidewall openings defined therein. The floor openings and the sidewall openings cooperate between the two coaxial components such that flow of gases through the floor and upright sidewall of the baffle structure is controlled by rotation of the two vertically coaxial components relative to one another.

Disclosed is a secondary combustion structure of a smokeless stove. The secondary combustion structure includes: a stove body, a combustion disc and an inner wall arranged in the stove body, several separated first ventilation holes are provided in the combustion disc, a heating chamber is defined by the inner wall and the stove body, several second ventilation holes are provided in the inner wall, and an air inlet hole is further provided in the stove body. With the design, heated air flows out of the second ventilation holes to support combustion of combustible gas, further secondary combustion is achieved, a combustible is combusted more sufficiently, and smoke is reduced; and moreover, a top of the stove body is inclined towards the inner wall, so as to increase a flow speed of the heated gas, and increase a fire behavior of the combustible.

A furnace burner for combusting solid particulate fuel comprises a drum configured for containing the solid particulate fuel for combustion. The drum is supported in a burn chamber of a furnace for rotation about a substantially horizontal axis. The drum comprises a combustion portion inside the burn chamber and configured to support combustion of the fuel therein and a drive portion connected to the combustion portion and extending therefrom to an external end disposed outside the burn chamber for operative coupling to a drive system to rotate the drum. The combustion portion is perforated to permit passage of air but not fuel through a peripheral wall of the combustion portion, and comprises one or more interior flights extending axially and angularly of the drum in a manner conducive of movement of the particulate fuel, upon rotation of the drum, towards a downstream end to release fuel consumed during combustion.

A biomass heating system for burning fuel in the form of pellets and/or wood chips is disclosed, the system comprising the following: a boiler with a combustion device, a heat exchanger with a plurality of boiler tubes, wherein the combustion device comprises: a combustion chamber with a rotating grate, with a primary combustion zone and with a secondary combustion zone; wherein the primary combustion zone is enclosed by a plurality of combustion chamber bricks laterally and by the rotating grate from below; wherein a plurality of secondary air nozzles is provided in the combustion chamber bricks; wherein the primary combustion zone and the secondary combustion zone are separated at the level of the secondary air nozzles; wherein the secondary combustion zone of the combustion chamber is fluidically connected to an inlet of the heat exchanger.

A biomass heating system for firing fuel in the form of pellets and/or wood chips is disclosed, comprising: a boiler with a combustion device; a heat exchanger with an inlet and an outlet; wherein the combustion device comprises a combustion chamber with a primary combustion zone and with a secondary combustion zone provided downstream thereof; the combustion device having a rotating grate on which the fuel can be burned; the secondary combustion zone of the combustion chamber being fluidically connected to the inlet of the heat exchanger the primary combustion zone being laterally enclosed by a plurality of combustion chamber bricks.

A floor and an upright sidewall formed from two vertically coaxial components, each component having a floor baffle with a plurality of floor openings defined therein, each floor retained within a respective upright sidewall with a plurality of sidewall openings defined therein. The floor openings and the sidewall openings cooperate between the two coaxial components such that flow of gases through the floor and upright sidewall of the baffle structure is controlled by rotation of the two vertically coaxial components relative to one another.

The present disclosure provides a system and a method for calcining coal gangue, which belongs to the technical field of coal gangue treatment and resource utilization. The system for calcining coal gangue provided by the present disclosure includes a pretreatment system (1), a crusher (4), a screening system (5), an elevator (6-1), a screw feeder (6-2 ), a rotary kiln (7), and an exhaust gas treatment system (8). The crusher 4 includes a hammer crusher or an impact crusher. The screening system 5 includes a flip-flow screen or a vibrating screen. Both the flip-flow screen and the vibrating screen are of double-layer screen mesh structures. The mesh size of an upper-layer screen f a double-layer screen mesh structure is 25 mm, and the mesh size of a lower-layer screen of the double-layer screen mesh structure is 0.5 mm.

A non-bypassable catalyst assisted appliance includes, for example, a housing having a combustion chamber, a loading door, an air inlet opening, and an exit opening connectable to a flue. A platform defines a non-movable separation in the housing between the combustion chamber and the exit opening. An insulated catalyst combustor is disposed between a top wall of the housing and the platform. When the door of the appliance is closed, gas from the combustion chamber is exhausted and directed along a single flow path horizontally through the insulated catalytic combustor and into the flue. When the door of the appliance is open, gas from the combustion chamber is inhibited from passing through the loading door opening, and ambient air entering the loading door opening and combustion gas from the combustion chamber are exhausted and directed along a single flow path horizontally through the insulated catalytic combustor and into the flue.

A system for combusting fuel comprising an apparatus that receives fuel that is characterized as comprising interstitial spacing and wherein oxidants pass through the interstitial spacing of the fuel to sustain a combustion reaction at the interface of a reaction chamber while the byproducts of combustion pass into the reaction chamber.