A burner for combusting low pressure gas includes: an outer wall configured as a venturi including a lower end, a mid throat section, and an upper end, the lower end being bell shaped and the upper end further including an upper end inner diameter; and a nozzle configured to receive and deliver a low-pressure gas stream, the nozzle having an opening into the lower end.

A high efficiency heating apparatus for heating fluids and cooking mediums, such as oil or shortening within a fryer, includes a natural draft (non powered) combustion chamber that is affixed to an exterior surface of a fry tank.

A high efficiency heating apparatus for heating fluids and cooking mediums, such as oil or shortening within a fryer, includes a natural draft (non powered) combustion chamber that is affixed to an exterior surface of a fry tank.

Example furnaces and methods related thereto include a burner box including at least one burner configured to combust a fuel/air mixture. In addition, the furnace includes a first blower including an inlet nozzle having an air inlet and fuel inlet. The inlet nozzle is configured such that operation of the first blower is to pull air and fuel into the inlet nozzle to produce the fuel/air mixture at a fuel/air ratio that is configured to produce flue products having less than 14 Nano-grams per Joule of nitrogen oxides when combusted. Operation of the first blower is configured to push the fuel/air mixture into the burner box. Further, the furnace includes a heat exchanger assembly fluidly coupled to the burner box through a vestibule, and a second blower configured to pull the flue products through the heat exchanger assembly.

A plaque for a radiant heating system can include a main body defining an outer surface and a plurality of pores defined within the main body, wherein at least some of the plurality of pores are disposed in a non-parallel relationship with at least some others of the plurality of pores, or wherein at least some of the pores are parallel with each other. A burner assembly including a plurality of adjacently arranged plaques reduces the ignition time and delay for adjacent plaques after the central plaque has been ignited.

A plaque for a radiant heating system can include a main body defining an outer surface and a plurality of pores defined within the main body, wherein at least some of the plurality of pores are disposed in a non-parallel relationship with at least some others of the plurality of pores, or wherein at least some of the pores are parallel with each other. A burner assembly including a plurality of adjacently arranged plaques reduces the ignition time and delay for adjacent plaques after the central plaque has been ignited.

A combination gas burner assembly includes a first burner forming a first profile shape and a second burner positioned above the first burner. The second burner forms a second profile shape different from the first profile shape. The first burner and the second burner form a perimeter of the gas burner assembly. The first profile shape overlaps with the second profile shape forming an overlapping portion of the perimeter.

A combination gas burner assembly includes a first burner forming a first profile shape and a second burner positioned above the first burner. The second burner forms a second profile shape different from the first profile shape. The first burner and the second burner form a perimeter of the gas burner assembly. The first profile shape overlaps with the second profile shape forming an overlapping portion of the perimeter.

A wall-arranged giant ring-shaped direct-current pulverized coal burner includes burner nozzles arranged on four side furnace walls of a boiler. The burner nozzles on the four side furnace walls form a wall-tangential combustion mode in the furnace, and the burner nozzles on each side furnace wall are arranged in a ring by a plurality of small nozzles to form a giant ring-shaped combined nozzle. There is a plurality of small nozzles arranged in a ring on each side furnace wall to form a giant ring-shaped combined nozzle. The giant ring-shaped combined nozzles on the four side furnace walls may form a wall- tangential combustion mode in the furnace. Through the mutual entrainments of the multiple airflows in the giant ring-shaped combined nozzle and the mutual support of the fireside and back-fire-side airflows, the stiffness of each airflow may be effectively enhanced.

A wall-arranged giant ring-shaped direct-current pulverized coal burner includes burner nozzles arranged on four side furnace walls of a boiler. The burner nozzles on the four side furnace walls form a wall-tangential combustion mode in the furnace, and the burner nozzles on each side furnace wall are arranged in a ring by a plurality of small nozzles to form a giant ring-shaped combined nozzle. There is a plurality of small nozzles arranged in a ring on each side furnace wall to form a giant ring-shaped combined nozzle. The giant ring-shaped combined nozzles on the four side furnace walls may form a wall- tangential combustion mode in the furnace. Through the mutual entrainments of the multiple airflows in the giant ring-shaped combined nozzle and the mutual support of the fireside and back-fire-side airflows, the stiffness of each airflow may be effectively enhanced.