A cooking or baking oven can include a hood having a vent outlet and a cooking chamber having a rack positioned therein. The cooking or baking oven can also include a heating chamber separated from the cooking chamber, a fuel burner, a fuel burner blower operably coupled to the fuel burner, a burner tube having an inlet end and an outlet end, the inlet end coupled to the fuel burner, and a flue having an inlet end coupled to the outlet end of the burner tube and an outlet end coupled to the hood, the flue having an opening. The cooking or baking oven can also include a damping system having a damper lid coupled to the flue, the damper lid moveable between an open position and a closed position, the damper lid in the closed position covering the opening; a damper motor; and a damper arm coupled to the damper lid and the damper motor, the damper motor rotatably moving the damper arm to move the damper lid between the open and closed positions. Related systems and methods are also provided.

A cooking or baking oven can include a hood having a vent outlet and a cooking chamber having a rack positioned therein. The cooking or baking oven can also include a heating chamber separated from the cooking chamber, a fuel burner, a fuel burner blower operably coupled to the fuel burner, a burner tube having an inlet end and an outlet end, the inlet end coupled to the fuel burner, and a flue having an inlet end coupled to the outlet end of the burner tube and an outlet end coupled to the hood, the flue having an opening. The cooking or baking oven can also include a damping system having a damper lid coupled to the flue, the damper lid moveable between an open position and a closed position, the damper lid in the closed position covering the opening; a damper motor; and a damper arm coupled to the damper lid and the damper motor, the damper motor rotatably moving the damper arm to move the damper lid between the open and closed positions. Related systems and methods are also provided.

A gas heater includes a premix burner, a supply channel for supplying a mixture of a gaseous fuel and air to the burner, and a check valve placed in the supply channel upstream of the burner. The check valve includes a moveable valve body having a first end position in which the check valve is opened and a second end position in which the check valve is closed. In a first pressure condition in which a pressure upstream is higher than a pressure downstream, the valve body is urged to the first end position. In a second pressure condition in which the pressure upstream is lower than the pressure downstream the valve body is urged to the second end position. After closure of the check valve the check valve remains closed for a delay time.

A gas heater includes a premix burner, a supply channel for supplying a mixture of a gaseous fuel and air to the burner, and a check valve placed in the supply channel upstream of the burner. The check valve includes a moveable valve body having a first end position in which the check valve is opened and a second end position in which the check valve is closed. In a first pressure condition in which a pressure upstream is higher than a pressure downstream, the valve body is urged to the first end position. In a second pressure condition in which the pressure upstream is lower than the pressure downstream the valve body is urged to the second end position. After closure of the check valve the check valve remains closed for a delay time.

A method is provided for controlling airflow into a furnace that employs a velocity type damper. In one embodiment, the method for controlling airflow may include engaging a velocity type damper to an air port opening of a furnace. The velocity type damper includes at least one air controlling surface that is positioned proximate to a wall of the furnace at the air port opening so that air velocity exiting the at least one air controlling surface is substantially equal to the air velocity entering the air port opening to the furnace. The method may further include adjusting a cross sectional area through the velocity type damper to control air velocity into the furnace through the air port opening.

A combustion system is capable of using a petroleum pitch fuel, and is provided with a burner having a fuel supply pipe where a flame stabilizing plate is formed in a tip end of the same, and a high temperature maintaining unit for maintaining an atmosphere temperature at a vicinity of the flame stabilizing plate during operation higher than a softening point of the petroleum pitch fuel. Thus, even when the petroleum pitch is used as fuel, the burner does not become unusable due to adhesion/solidification of the petroleum pitch inside the burner and combustion operation can be continued for a long time.

A combustion system is capable of using a petroleum pitch fuel, and is provided with a burner having a fuel supply pipe where a flame stabilizing plate is formed in a tip end of the same, and a high temperature maintaining unit for maintaining an atmosphere temperature at a vicinity of the flame stabilizing plate during operation higher than a softening point of the petroleum pitch fuel. Thus, even when the petroleum pitch is used as fuel, the burner does not become unusable due to adhesion/solidification of the petroleum pitch inside the burner and combustion operation can be continued for a long time.

A gas burner includes a burner body that defines a plurality of forced induction flame ports. An air outlet orifice is mounted to an injet body at an outlet of an air passage such that the air outlet orifice is oriented for directing a flow of air towards the plurality of forced induction flame ports. A gas outlet orifice is mounted to the injet body at an outlet of a gas passage such that the gas outlet orifice is oriented for directing a flow of gaseous fuel towards the plurality of forced induction flame ports. A pneumatically actuated gas valve is positioned within the injet body. The pneumatically actuated gas valve is configured to adjust from a closed configuration to an open configuration in response to the flow of air through the air passage.

A process and apparatus for reducing pressure of a flue gas stream comprising passing a pressurized flue gas stream to a vessel and through a bed of particulates in the vessel to reduce the pressure of the flue gas stream. The flue gas passes from the vessel at a lower pressure than at which it entered. The bed of particulates is disposed in the vessel between the outlet end of the inlet conduit and the inlet end of the outlet conduit. If deposits develop in the bed of particulates, the particulates can be replaced with fresh particulates to avoid excessive pressure drop. Data may be received from a stream in fluid communication with the foregoing process and apparatus.

A process and apparatus for reducing pressure of a flue gas stream comprising passing a pressurized flue gas stream to a vessel and through a bed of particulates in the vessel to reduce the pressure of the flue gas stream. The flue gas passes from the vessel at a lower pressure than at which it entered. The bed of particulates is disposed in the vessel between the outlet end of the inlet conduit and the inlet end of the outlet conduit. If deposits develop in the bed of particulates, the particulates can be replaced with fresh particulates to avoid excessive pressure drop. Data may be received from a stream in fluid communication with the foregoing process and apparatus.