Mixing apparatus and method for molten glass
A technology for melting glass and facilities, which can be used in glass furnace equipment, glass manufacturing equipment, combustion methods, etc., and can solve the problems of expensive and complicated layout of mixing furnaces.
Active Publication Date: 2016-12-21
LAIR LIQUIDE SA POUR LETUDE & LEXPLOITATION DES PROCEDES GEORGES CLAUDE
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[0071] According to the invention, by indirect heat exchange with the hot flue gases exiting the combustion chamber in the manner already described in US-A-6071116 (i.e. by heating an intermediate oxidant in a first heat exchanger, this heated intermediate oxidant is then used in the Preheating the rich oxidant in the second heat exchanger) preheats the rich oxidant. This known technique achieves a 1'10% gain in oxygen and combustibles consumption at preheated temperatures of the rich oxidant (and possibly combustibles) and reactants of 400°C to 650°C compared to using a non-preheated rich oxidant . The exact gain depends essentially on the temperature level reached by the preheated reactants, as well as the furnace design and the type of burner used.
[0072] The volume of intermediate oxidant required to preheat the rich oxidizer (and possibly combustibles) depends primarily on the nature of the intermediate oxidant and its mass heat capacity. Thus, if the enriched oxidant...
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The process comprises introducing a raw material to be melted in a melting chamber of a furnace, burning fuel through burners so as to generate thermal energy for melting the raw material and to obtain molten glass and a hot stream of fumes having a temperature of 1000-1600[deg] C at an outlet of the melting chamber, introducing the hot stream of fumes from the melting chamber in a preheating installation of the furnace, and heating, in a first thermal exchanger of the preheating installation, a first oxidizing stream using an oxidizing agent having an oxygen content of 21 vol.%. The process comprises introducing a raw material to be melted in a melting chamber of a furnace, burning fuel through burners so as to generate thermal energy for melting the raw material and to obtain molten glass and a hot stream of fumes having a temperature of 1000-1600[deg] C at an outlet of the melting chamber, introducing the hot stream of fumes from the melting chamber in a preheating installation of the furnace, heating, in a first thermal exchanger of the preheating installation, a first oxidizing stream using an oxidizing agent having an oxygen content of 21 vol.% and containing air by heat exchange with the hot stream of fumes so as to generate cold stream of fumes and a heated stream of oxidant with a temperature of 600-900[deg] C, heating, in a second thermal exchanger of the preheating installation, a second oxidizing stream having an oxygen content of 80-100 vol.% by heat exchange with the heated stream of oxidant so as to generate preheated stream of rich oxidant with an temperature of 400-650[deg] C and a tempered stream of oxidant with an temperature of 350-650[deg] C, and providing the preheated stream and tempered stream of oxidant in the burners. The tempered stream of oxidant has an oxygen content of 40-90 vol.%. An independent claim is included for an installation for melting glass.
Description
technical field [0001] The present invention relates to glass melting processes and furnaces with heat recovery. Background technique [0002] Traditionally, glass melting furnaces use as combustion agent air that has been preheated by heat exchange with the flue gases coming from the furnace, for example by means of a heat exchanger. [0003] The use of a number of additional oxy-fuel burners is known to boost the draw rate in such furnaces, which are usually heated by air combustion. Such furnaces that use air and oxygen as combustion oxidants are also referred to as "hybrid furnaces". [0004] Finally, it is also known, especially in the field of glass melting furnaces, to heat glass melting furnaces mainly or exclusively with oxy-fuel combustion, which makes it possible to significantly reduce the pollution emissions (NOx, dust) and energy consumption of the furnace. [0005] According to a particularly efficient embodiment of the furnace described in US-A-6071116 usin...
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IPC IPC(8): C03B5/04C03B5/235C03B5/237
CPCC03B5/2353C03B5/237F23L7/007F23L15/04F28D21/0001F28D21/001Y02E20/34Y02P40/50
Inventor L·雅里R·齐阿瓦
Owner LAIR LIQUIDE SA POUR LETUDE & LEXPLOITATION DES PROCEDES GEORGES CLAUDE