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 comprising steps of:

• supplying oxidizers to the inside of an oxidizer supply chamber, and fuel to a fuel chamber that is provided in the central part of the interior of an injection block surrounded with an output end of the oxidizer supply chamber;
• introducing oxidizers of the oxidizer supply chamber to a plurality of inlet ends of injection channels, in a throttling portion where a diameter between oxidizer chamber supplied with oxidizer inside and an output end is gradually reduced;
• injecting 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 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 the 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 the front end of the body portion with an inner diameter gradually reduced toward the front side, and the exhaust gas is recirculated and output to the interior of the internal recirculation tube by a differential pressure in the radiant tube.