Patent DE-102010021071-A1 (DE)
Title: Melting glass, comprises supplying melting furnace, fuel gas and gaseous oxidizer via burner assembly to burn inside oven, collecting exhaust gas stream existing from oven, and introducing partial flow of exhaust stream back into oven
Inventor: HEYMANN CLAAS
IPC: C03B5/16
Filed: 2010-05-19
Abstract: The method comprises supplying a melting furnace, a fuel gas and a gaseous oxidizer such as air through a burner assembly to burn inside a oven, collecting an exhaust gas stream existing from the oven, and introducing a partial flow of the exhaust stream back into the oven. The amount of air fed to the oven to a partial air flow is reduced compared to a total amount of air that is required without the return of the partial exhaust gas flow to achieve a desired combustion condition. An amount of oxygen is balanced by adding pure oxygen by reducing the lack of air flow. The method comprises supplying a melting furnace, a fuel gas and a gaseous oxidizer such as air through a burner assembly to burn inside an oven, collecting an exhaust gas stream existing from the oven, and introducing a partial flow of the exhaust stream back into the oven. The amount of air fed to the oven to a partial air flow is reduced compared to a total amount of air that is required without the return of the partial exhaust gas flow to achieve a desired combustion condition. An amount of oxygen is balanced by adding pure oxygen by reducing the lack of air flow, where the oxygen content of corrective exhaust gas is considered. The supplemental oxygen is supplied to a stream of fresh air, and to the exhaust partial stream, where the oxygen is fed to the oven through a furnace wall and a vaulted ceiling. The exhaust partial stream flows downstream a heat exchanger that serves for preheating the oxidizer stream that is removed from the exhaust gas stream, and is mixed with the combustion gas stream or a fuel gas partial stream just before entering the furnace. The two heat exchangers are provided, where each heat exchanger is assigned to a burner assembly or group of burner arrangements. The heat exchangers are arranged in a respective oxidizer path of the burner assembly or group of burner arrangements, where if one of the burner assemblies or groups of fuel gas burner arrangements and oxidizer is fed, the exhaust gases are removed from the furnace through the oxidizer path of the burner assemblies or from the other groups of the burner assemblies. The operating direction of the burner assemblies at a predetermined time is conversely 20 minutes, where each of the heat exchanger has a number of heat storage elements, which depend upon the operating direction of the oxidizer or the exhaust gas to and/or flows through. The exhaust stream of the combustion gas stream or the fuel gas partial stream flows around a jacket and is carried out from the jacket. The fuel gas stream or the fuel gas partial stream has an overpressure of 0.5 bar and flows into the mixing position at a flow rate of 200 m/second. The exhaust gas partial flow is interrupted when the oxygen concentration in the exhaust gas exceeds a predetermined value. The exhaust gas partial stream is mixed with the oxidizer stream before entering the furnace, and is supplied to the oxidizer stream by a blower. The supplemental oxygen stream of the exhaust partial gas stream flows around the jacket and is carried away by the jacket, where the new combined mixed flow of a fresh air stream is supplied. The supplemental oxygen stream flows around the jacket. The back flow of the oxygen in the exhaust stream is prevented by a locking device. The exhaust stream of an auxiliary oxygen stream flows around a jacket and is carried away by the jacket, and the resulting mixed stream is supplied to the stream of fresh air.