| 摘要 |
A steam generating furnace with multiple coal-air burners has a corresponding number of supplemental oxygen-fuel burners, each mounted centrally of a coal-air burner respectively, for directing an oxy-fuel flame into a combustible mixture of powdered coal and air; the oxy-fuel burners are controlled to operate at a standby low-head setting during normal coal-air combustion, and are automatically controlled by flame sensing means during transitory coal-air flame deficiency and instability to operate at maximum heat for maintaining continuous furnace combustion. A manual over-ride switch operates the oxy-fuel burners at maximum heat such as for furnace starting, etc.
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