Industrial premixed gas combustor using internal exhaust gas recirculation and operating method thereof

An operating method of an industrial premixed gas combustor using internal exhaust gas recirculation, the operating method comprising:

• supplying oxidizers to an inside of an oxidizer supply chamber, and fuel to a fuel chamber that is provided in a central part of an interior of an injection block surrounded with an output end of the oxidizer supply chamber;
• introducing the oxidizers of the oxidizer supply chamber to a plurality of inlet ends of injection channels, in a throttling portion where a diameter between an oxidizer chamber supplied with the oxidizers inside and an output end is gradually reduced;
• injecting the fuel inside the fuel chamber to respective injection channels through a plurality of orifices for fuel injection provided in-between the fuel chamber of the injection block and each of the injection channels and mixing the fuel and the oxidizers;
• mixing and injecting the fuel and the oxidizers through a discharge end of each of the injection channels;
• and
• recirculating exhaust gas due to combustion through an internal recirculation tube that is formed to be spaced apart from an outer surface of the output end of the oxidizer supply chamber at a predetermined interval and to extend toward an outlet, wherein
• the internal recirculation tube includes a body portion that is spaced apart from the outer surface of the output end at a predetermined interval and extends with a constant inner diameter, and an outlet throttling portion that is connected with a front end of the body portion with an inner diameter gradually reduced toward a front side, and the exhaust gas is recirculated and output to an interior of the internal recirculation tube by a differential pressure in a radiant tube.

An industrial premixed gas combustor using internal exhaust gas recirculation, the industrial premixed gas combustor comprising:

• an oxidizer supply chamber provided with an oxidizer chamber where oxidizers are supplied, an output end that is open at one end and has a smaller inner diameter than an inner diameter of the oxidizer chamber, and a throttling portion with a gradually decreasing inner diameter in-between the oxidizer chamber and the output end;
• an injection block configured to be surrounded with the output end of the oxidizer supply chamber, and having a fuel chamber that is provided in a central part of an interior of the fuel chamber and is supplied with fuel and a plurality of injection channels where the oxidizers are introduced from the oxidizer supply chamber and the fuel and the oxidizers are mixed and injected;
• an orifice for fuel injection provided in-between the fuel chamber of the injection block and each of the injection channels, and injecting the fuel inside the fuel chamber to the injection block;
• and
• an internal recirculation tube formed to be spaced apart from an outer surface of the output end of the oxidizer supply chamber at a predetermined interval and to extend toward an outlet, and recirculating exhaust gas due to combustion,
• wherein the internal recirculation tube has a body portion that is spaced apart from the outer surface of the output end at a predetermined interval and extends with a constant inner diameter, and an outlet throttling portion that is connected with a front end of the body portion with an inner diameter of the outlet throttling portion gradually reduced toward a front side.