| 摘要 |
1,115,889. Controlling burners. ESSO RESEARCH & ENGINEERING CO. 18 July, 1966 [2 Aug., 1965], No. 32194/66. Addition to 1,080,069. Heading F4T. A process for the control of low excess air combustion in a multiple-burner furnace comprises (a) adjusting the air-fuel feed to a first burner while analyzing the concentration of a flue gas component whose concentration is proportional to the level of excess air operation of this burner, thereby establishing the stoichiometric point of the burner; (b) adjusting the first burner to the desired low excess air level and (c) sequentially repeating (a) and (b) for each of the other burners. Any further adjustment to the fuel-air feed indicated by analyzing the flue gases is made to all the burners simultaneously. The analysis is carried out on either the carbon monoxide or carbon dioxide component of the flue gases. Step (b) is carried out either by a trial-and-error technique or by determining the burner flame temperature and adjusting the air level until the temperature has altered by 25‹ F. which will provide for the required 3% excess air level. |
