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A combustion air supply apparatus 9 of alternating heat exchange type supplies combustion air and discharges combustion exhaust gas at a flow velocity of 80 to 200 m/sec. A burner assembly 4 is configured in such a manner that low-caloric fuel gas is pre-heated with heat of pre-combusting high-calor

A combustion air supply apparatus 9 of alternating heat exchange type supplies combustion air and discharges combustion exhaust gas at a flow velocity of 80 to 200 m/sec. A burner assembly 4 is configured in such a manner that low-caloric fuel gas is pre-heated with heat of pre-combusting high-caloric fuel gas before the low-caloric fuel gas reaches a mixing starting space CA in the combustion chamber where the pre-combusting high-caloric fuel gas and the low-caloric fuel gas come to burn together in a full scale in the mixing starting space CA. When an air amount of the combustion air supplied through the high-temperature air supply ports of the plurality of fuel gas combustion apparatuses is defined as Q1 and an air amount of the pre-combustion air to be mixed with the high-caloric fuel gas, supplied from the fuel gas combustion apparatuses, is defined as Q2, a total air amount (Q1+Q2) is 1.02 to 1.10 times more than a theoretical air amount QS required for combustion, and a ratio of Q2/(Q1+Q2) is 0.011 to 0.047.

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1. A reactor employing high-temperature air combustion technology, including a combustion chamber and a plurality of fuel gas combustion apparatuses disposed at a predetermined interval, the plurality of fuel gas combustion apparatuses each comprising: a burner assembly for continuously injecting fu

1. A reactor employing high-temperature air combustion technology, including a combustion chamber and a plurality of fuel gas combustion apparatuses disposed at a predetermined interval, the plurality of fuel gas combustion apparatuses each comprising: a burner assembly for continuously injecting fuel gas into the combustion chamber, anda combustion air supply apparatus of alternating heat exchange type,the combustion air supply apparatus having two vent openings and including a regenerating means having air permeability, the combustion air supply apparatus using one of the two vent openings as a combustion exhaust gas discharge port to discharge combustion exhaust gas out of the combustion chamber via the regenerating means and using the other vent opening as a high-temperature air supply port to supply combustion air, which has been elevated to a high temperature with sensible heat of the regenerating means, to the combustion chamber, the two vent openings alternately switching to work as the combustion exhaust gas discharge port or the high-temperature air supply port,the burner assembly having an injection port for pre-combusting high-caloric fuel gas and a plurality of injection ports for low-caloric fuel gas that are disposed apart from each other in an area surrounding the injection port for pre-combusting high-caloric fuel gas, whereinhigh-caloric fuel gas and pre-combustion air are mixed to form high-temperature pre-combusting high-caloric fuel gas in which the high-caloric fuel gas is partially combusting, the pre-combusting high-caloric fuel gas is continuously injected into the combustion chamber through the injection port for pre-combusting high-caloric fuel gas, and the low-caloric fuel gas is continuously injected into the combustion chamber through the plurality of injection ports for low-caloric fuel gas;the low-caloric fuel gas is pre-heated with heat of the pre-combusting high-caloric fuel gas before the low-caloric fuel gas reaches a mixing starting space in the combustion chamber where the pre-combusting high-caloric fuel gas and the combustion air begin to mix with each other, and then the pre-combusting high-caloric fuel gas and the low-caloric fuel gas come to combust together in a full scale in the mixing starting space;the combustion air supply apparatus of alternating heat exchange type supplies the combustion air and discharges the combustion exhaust gas at a flow velocity of 80 to 200 m/sec; andwhen an air amount of the combustion air supplied through the high-temperature air supply ports of the plurality of fuel gas combustion apparatuses is defined as Q1 and an air amount of the pre-combustion air to be mixed with the high-caloric fuel gas, supplied from the fuel gas combustion apparatuses, is defined as Q2, a total air amount (Q1+Q2) is 1.02 to 1.10 times more than a theoretical air amount QS required for combustion, and a ratio of Q2/(Q1+Q2) is 0.011 to 0.047. 2. The reactor employing high-temperature air combustion technology according to claim 1, wherein in the fuel gas combustion apparatus, a distance L1 between the centerline of the injection port for pre-combusting high-caloric fuel gas and the centerline of each of the two vent openings and a height L2 from the two vent openings to the injection port for pre-combusting high-caloric fuel gas and the injection ports for low-caloric fuel gas are determined so that a part of the pre-combusting high-caloric fuel gas injected from the injection port for pre-combusting high-caloric fuel gas and/or a part of the low-caloric fuel gas injected from the injection ports for low-caloric fuel gas may be suppressed from being discharged through the vent opening working as the combustion exhaust gas discharge port before the pre-combusting high-caloric fuel gas and the low-caloric fuel gas reach the mixing starting space, and that the combustion exhaust gas may partially be prevented from being drawn into the combustion exhaust gas discharge port due to the existence of the pre-combusting high-caloric fuel gas injected from the inject ion port for pre-combusting high-caloric fuel gas and the low-caloric fuel gas injected from the injection ports for low-caloric fuel gas. 3. The reactor employing high-temperature air combustion technology according to claim 2, wherein the burner assembly of the fuel gas combustion apparatus includes a fireproof cylindrical portion having in a central location thereof the injection port for pre-combusting high-caloric fuel and a pre-combustion chamber communicating with the injection port for pre-combusting high-caloric fuel gas;the fireproof cylindrical portion has the plurality of injection ports for low-caloric fuel gas disposed at a predetermined interval in a circumferential direction thereof to surround the injection port for pre-combusting high-caloric fuel gas, and low-caloric fuel gas passages disposed to surround the pre-combustion chamber and communicating with the injection ports for low-caloric fuel gas; andthe fireproof cylindrical portion also has an injection port for high-caloric fuel gas and an injection port for pre-combustion air on a bottom portion of the pre-combustion chamber. 4. The reactor employing high-temperature air combustion technology according to claim 2, wherein the height L2 is 50 to 600 mm. 5. The reactor employing high-temperature air combustion technology according to claim 4, wherein the two vent openings and the injection port for pre-combusting high-caloric fuel gas are arranged in a line with the injection port for pre-combusting high-caloric fuel gas disposed in the center of the line;the combustion air is supplied and the combustion exhaust gas is discharged at the flow velocity of 80 to 200 m/sec;the distance L1 is 350 to 500 mm;a distance PCD between the centers of the two vent openings, which is two times longer than the distance L1, and a diameter Da of each of the two vent openings are determined so that a ratio of PCD/Da may be 3 to 6.5; andon an assumption that a relationship of a possible setting for the ratio of PCD/Da and the flow velocity is defined as a lower-limit relationship when the distance PCD is 700 mm and the flow velocity is varied within a range of 80 to 200 m/sec and that a relationship of a possible setting for the ratio of PCD/Da and the flow velocity is defined as an upper-limit relationship when the distance PCD is 1000 mm and the flow velocity is varied within a range of 80 to 200 m/sec, the ratio of PCD/Da and the diameter Da are determined so that a relationship between the ratio of PCD/Da and the flow velocity may fall within a range defined by the lower-limit relationship and the upper-limit relationship. 6. A fuel gas combustion apparatus comprising: a burner assembly for continuously injecting fuel gas into the combustion chamber, anda combustion air supply apparatus of alternating heat exchange type,the combustion air supply apparatus having two vent openings and including a regenerating means having air permeability, the combustion air supply apparatus using one of the two vent openings as a combustion exhaust gas discharge port to discharge combustion exhaust gas out of the combustion chamber via the regenerating means and using the other vent opening as a high-temperature air supply port to supply combustion air, which has been elevated to a high temperature with sensible heat of the regenerating means, to the combustion chamber, the two vent openings alternately switching to work as the combustion exhaust gas discharge port or the high-temperature air supply port,the burner assembly having an injection port for pre-combusting high-caloric fuel gas and a plurality of injection ports for low-caloric fuel gas that are disposed apart from each other in an area surrounding the injection port for pre-combusting high-caloric fuel gas, whereinhigh-caloric fuel gas and pre-combustion air are mixed to form high-temperature pre-combusting high-caloric fuel gas in which the high-caloric fuel gas is partially combusting, the pre-combusting high-caloric fuel gas is continuously injected into the combustion chamber through the injection port for pre-combusting high-caloric fuel gas, and the low-caloric fuel gas is continuously injected into the combustion chamber through the plurality of injection ports for low-caloric fuel gas;the low-caloric fuel gas is pre-heated with heat of the pre-combusting high-caloric fuel gas before the low-caloric fuel gas reaches a mixing starting space in the combustion chamber where the pre-combusting high-caloric fuel gas and the combustion air begin to mix with each other, and then the pre-combusting high-caloric fuel gas and the low-caloric fuel gas come to combust together in a full scale in the mixing starting space. 7. The fuel gas combustion apparatus according to claim 6, wherein the plurality of injection ports for low-caloric fuel gas are disposed at an equidistant interval in a circumferential direction of an imaginary circle defined with respect of the center of the injection port for pre-combusting high-caloric fuel gas. 8. The fuel gas combustion apparatus according to claim 6, wherein the injection port for pre-combusting high-caloric fuel gas and the injection ports for low-caloric fuel gas are projecting more inwardly than the two vent openings in the combustion chamber. 9. The fuel gas combustion apparatus according to claim 8, wherein a distance L1 between the centerline of the injection port for pre-combusting high-caloric fuel gas and the centerline of each of the two vent openings and a height L2 from the two vent openings to the injection port for pre-combusting high-caloric fuel gas and the injection ports for low-caloric fuel gas are defined so that a part of the pre-combusting high-caloric fuel gas injected from the injection port for pre-combusting high-caloric fuel gas and/or a part of the low-caloric fuel gas injected from the injection ports for low-caloric fuel gas may be suppressed from being discharged through the vent opening working as the combustion exhaust gas discharge port before the pre-combusting high-caloric fuel gas and the low-caloric fuel gas reach the mixing starting space, and that the combustion exhaust gas may partially be prevented from being drawn into the combustion exhaust gas discharge port due to the existence of the pre-combusting high-caloric fuel gas injected from the injection port for pre-combusting high-caloric fuel gas and the low-caloric fuel gas injected from the injection ports for low-caloric fuel gas. 10. The fuel gas combustion apparatus according to claim 7, wherein the burner assembly includes a fireproof cylindrical portion having in a central location thereof the injection port for pre-combusting high-caloric fuel and a pre-combustion chamber communicating with the injection port for pre-combusting high-caloric fuel gas,the fireproof cylindrical portion has the plurality of injection ports for low-caloric fuel gas disposed at a predetermined interval in a circumferential direction thereof to surround the injection port for pre-combusting high-caloric fuel gas, and low-caloric fuel gas passages disposed to surround the pre-combustion chamber and communicating with the injection ports for low-caloric fuel gas; andthe fireproof cylindrical portion also has an injection port for high-caloric fuel gas and an injection port for pre-combustion air on a bottom portion of the pre-combustion chamber. 11. The fuel gas combustion apparatus according to claim 9, wherein the height L2 is 50 to 600 mm. 12. The fuel gas combustion apparatus according to claim 6, wherein the two vent openings and the injection port for pre-combusting high-caloric fuel gas are arranged in a line with the injection port for pre-combusting high-caloric fuel gas disposed in the center of the line;the combustion air is supplied and the combustion exhaust gas is discharged at the flow velocity of 80 to 200 m/sec;the distance L1 is 350 to 500 mm;a distance PCD between the centers of the two vent openings, which is two times longer than the distance L1, and a diameter Da of each of the two vent openings are determined so that a ratio of PCD/Da may be 3 to 6.5; andon an assumption that a relationship of a possible setting for the ratio of PCD/Da and the flow velocity is defined as a lower-limit relationship when the distance PCD is 700 mm and the flow velocity is varied within a range of 80 to 200 m/sec and that a relationship of a possible setting for the ratio of PCD/Da and the flow velocity is defined as an upper-limit relationship when the distance PCD is 1000 mm and the flow velocity is varied within a range of 80 to 200 m/sec, the ratio of PCD/Da and the diameter Da are determined so that a relationship between the ratio of PCD/Da and the flow velocity may fall within a range defined by the lower-limit relationship and the upper-limit relationship. 13. The fuel gas combustion apparatus according to claim 6, wherein the pre-combustion air is heated with heat of the combustion exhaust gas discharged from the combustion air supply apparatus of alternating heat exchange type. 14. The fuel gas combustion apparatus according to claim 13, wherein the combustion air supply apparatus of alternating heat exchange type includes a pre-combustion air passage through which the pre-combustion air passes, the pre-combustion air passage being disposed between two flow passages arranged between the two vent openings and two of the regenerating means so as to be capable of thermal transfer between the pre-combustion air passage and the two flow passages.