The present invention relates to a process for producing a boron containing glass, comprising melting raw materials including boron compounds in a submerged combustion melter (11), withdrawing flue gases from said melter and recovering heat from said flue gases in appropriate heat recovery equipment prior to release into the environment.

A body to be installed into a radiant tube for reduction of pollutants, the body including a body having a tube shape including a length, an outer diameter and an inner diameter, the body further comprises a proximal surface, a terminal surface, and a circumferential surface extending between the proximal surface and terminal surface, and the body is configured to be disposed at an axial distance from a terminal end of a burner, wherein the axial distance (AD) is at least a 0.1% of the length of the body.

A burner for a facility for melting vitrifiable materials, includes an injector block including a combustion gas distribution network and at least one injector, and a plate in glass and/or flame contact which overlaps the injector block and includes at least one injection hole in fluid communication with the injector, wherein the plate is removably attached to the injector block.

A radiant tube includes a conduit; and one or more heat transfer promoters disposed in the conduit, wherein the heat transfer promoter includes a body part on a center side of the conduit, and protruding parts protruding from the body part toward an inner wall surface of the conduit, the protruding parts are on an outer periphery of the body part to be arranged in a circumferential direction of the conduit, the protruding parts includes first protruding parts having a distal end portion facing the inner wall surface across a gap ΔL, and a second protruding part, the number of first protruding parts is greater than the number of second protruding parts, and a ratio (ΔL/Dt) of the gap ΔL to an equivalent diameter Dt of a conduit portion is x %, where the heat transfer promoter is disposed, and formula (1) is satisfied: 0.3%<x<7%.

A radiant tube includes a conduit; and one or more heat transfer promoters disposed in the conduit, wherein the heat transfer promoter includes a body part on a center side of the conduit, and protruding parts protruding from the body part toward an inner wall surface of the conduit, the protruding parts are on an outer periphery of the body part to be arranged in a circumferential direction of the conduit, the protruding parts includes first protruding parts having a distal end portion facing the inner wall surface across a gap ΔL, and a second protruding part, the number of first protruding parts is greater than the number of second protruding parts, and a ratio (ΔL/Dt) of the gap ΔL to an equivalent diameter Dt of a conduit portion is x %, where the heat transfer promoter is disposed, and formula (1) is satisfied: 0.3%<x<7%.

An oxy-pyrohydrolysis article including a pyrotube and a sample insert are described. The sample insert includes a sample insert tube and a corrosion-resistant protective tube. Methods of conducting oxy-pyrohydrolysis using such articles, including their use for measuring total halogen (e.g., total fluorine) content are also described.

A submerged combustion melter is arranged with a melting chamber, which may be cylindrical, and at least five submerged combustion burners.

A submerged combustion melter includes first, second, third, and fourth side walls extending upwardly from a bottom wall, a crown extending inwardly with respect to the side walls and over the bottom wall to establish a melting chamber, an exhaust port configured to exhaust gas from the melting chamber, a baffle coupled to and extending inwardly from the third side wall to divide the melting chamber into melting sub-chambers that share the exhaust port and having an end spaced away from the fourth side wall, an inlet configured for introducing a glass batch into the melter, and an outlet configured to remove molten glass from the melting sub-chambers, which direct product flow in a laterally undulating flow path from the inlet to the outlet.

A supercritical CO.sub.2 boiler capable of realizing uniform combustion, corrosion resistance and coking resistance, and a boiler system are provided. The supercritical CO.sub.2 boiler includes a main combustion chamber, an upper furnace, a furnace arch and a flue, wherein a cross section of the main combustion chamber is circular or oval, or is of an N-sided shape, where N>4; at least four burner groups are disposed on the main combustion chamber, each group of burner nozzles corresponding to each burner group includes a recirculating air nozzle, a primary air nozzle and a secondary air nozzle; lateral recirculating air nozzles symmetrically distributed are respectively disposed at two sides of the primary air nozzle, the recirculating air nozzle and the lateral recirculating air nozzle are configured to feed recirculating flue gas or a mixed gas of the recirculating flue gas and secondary air into the main combustion chamber.

A supercritical CO.sub.2 boiler capable of realizing uniform combustion, corrosion resistance and coking resistance, and a boiler system are provided. The supercritical CO.sub.2 boiler includes a main combustion chamber, an upper furnace, a furnace arch and a flue, wherein a cross section of the main combustion chamber is circular or oval, or is of an N-sided shape, where N>4; at least four burner groups are disposed on the main combustion chamber, each group of burner nozzles corresponding to each burner group includes a recirculating air nozzle, a primary air nozzle and a secondary air nozzle; lateral recirculating air nozzles symmetrically distributed are respectively disposed at two sides of the primary air nozzle, the recirculating air nozzle and the lateral recirculating air nozzle are configured to feed recirculating flue gas or a mixed gas of the recirculating flue gas and secondary air into the main combustion chamber.