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Show ,-e... 300 ~ 0 200 ~ .". I II V V i I I .. --- , .. ~ - I -- ..... ~ 100 .---- • OltygeniCOG 13= 0% • OltygenJCOG 13 = 75% I< 0 Z 0 I • o~ygen/COG B= 150% I - I ...... II A air/COG 13= 0% 800 900 1000 .. 1100 1200 1300 I mean temperature CC) ~ Figure 7 NOx concentration standarized at 11 % en condition in the furnace DIVIDED SUPPLY OF COG OR OXYGEN It may be said, from what has been said above, that the new oxygen/COO burner with steam olowing is applicable for a reheating furnace. However, neither thennal unifonnity nor NOx reduction effect is enough for a large continuous reheating furnace because temperature distribution strongly depends on location of the burner. In order to improve the thermal unifonnity and NOx reduction performance, the authors have developed the divided supply of fuel or oxygen in a furnace. In the technology, the divided fuel supply, a part of COG is supplied at some distance from a burner, a fuel dispersed supply system, while the main oxygen/COG burner is burning in the excess oxygen condition. In another way, the divided oxygen supply, a part of oxygen in stead of COG is supplied, an oxygen dispersed supply system, the main oxygen/COG burner is, on the other hand, burning in the excess fuel condition. This technology requires only simple equipments to supply gas, for instance pipelines covered with slightly with insulators, and does not require roof burners. Since such a combustion system may cause imperfect combustion using conventional air/fuel burners, to the authors' knowledge, no reheating furnace has applied it The authors, however, came to the conclusion that the divided supply of fuel or oxygen is an successful technology in the appropriate high enthalpy field produced by oxygen/fuel burners. ,/. ..-A-u-x-i1-ia-r-y-C-O-G-o-r-O-2-r-e-e-di n-g-'I burner cd L ... 4) the divided supply ~ - - - =-;o...a..----====--- --=--__ -./ ~ ~, 0.. E ~ distance from burner Figure 8 Image of the divided gas supply system Figure 8 shows an image of the divided COO (or oxygen) supply system. All experiments have been carried out using the oxygen/COO burner introduced above, without steam blowing. Here, the auxiliary COG or oxygen is supplied on the burner axis. The experimental results of the divided COO |
