An apparatus for drying material for an asphalt mixing facility includes a rotary kiln rotatably drivable about an axis of rotation, in which the material is dried, wherein the rotary kiln has a material inlet and a material outlet, a heating unit coupled to the rotary kiln for feeding heat to the rotary kiln, wherein the heating unit is designed with a burner which has a burner housing having a longitudinal axis, an air duct arranged at the burner housing for feeding air, a swirling element for swirling the air in the burner housing relative to the longitudinal axis, a hydrogen gas line connected to the burner for feeding hydrogen gas into the burner, wherein a hydrogen gas nozzle is connected to the hydrogen gas line for discharging the hydrogen gas, a burner head arranged at the burner housing for generating a burner flame.

A fluid heating system is disclosed. The fluid heating system may include a first valve and a second valve configured to selectively control a supply of a first fuel source and second fuel source respectively. The fluid heating system may further include an air inlet configured to receive ambient air in the fluid heating system. The fluid heating system may further include a controller configured to determine whether the fluid heating system is using the first fuel source and/or the second fuel source. The controller may be further configured to determine an optimal opening area of an air inlet of the fluid heating system based on the determination of whether the fluid heating system is using the first fuel source and/or the second fuel source, and cause to adjust an opening area of the air inlet based on the optimal opening area.

Disclosed in the present disclosure is a gas system, including a valve switch member, provided with a mild-flame port and a functional port; an electromagnetic valve, connected to the functional port of the valve switch member; and a burner component, wherein the mild-flame port of the valve switch member is in communication with the burner component in a mild-flame state, and the electromagnetic valve is opened so that both the mild-flame port and the functional port of the valve switch member are in communication with the burner component in a high-flame state. Also, disclosed is a heating device based on the gas system, and a temperature regulating control method applying the gas system, addressing the problem that the existing gas water heater has a large number of components leading to a messy connection during assembly, higher cost and being not conducive to subsequent troubleshooting and maintenance.

A combustion system includes: a combustor including a first combustion region and a second combustion region continuous with the first combustion region on a downstream side thereof; a first burner including an injection portion of ammonia as first fuel, the injection portion facing the first combustion region, and a first injection portion of second fuel not containing nitrogen atoms, the first injection portion facing the first combustion region; a second burner including a second injection portion of the second fuel, the second injection portion facing the second combustion region; and a control device that adjusts a second fuel flow rate ratio between a flow rate of the second fuel injected from the first injection portion and a flow rate of the second fuel injected from the second injection portion.