| 摘要 |
A method 10 for optimizing a steam boiler 600 or oil heater for maximum fuel efficiency by systematically finding the most fuel-efficient combination of input control values 26, 42, 48, 89, 96, 112, 114, 116, 166, 170, 204, 218. A characteristic multi-dimensional look-up table is created by temporarily operating the process at all the possible functional combined settings of a plurality of input operators and recording for each combination of settings the resulting output values 602, 604 of a plurality of process parameters, for example, steam flow, 242, steam pressure 248, and exhaust composition 144, 148, 152. Input combinations resulting in either non-functional process or unacceptable output values are eliminated. Steam flow rate 242 is the primary output control parameter. A selected value of steam flow rate 242 is the primary control setpoint for the process 10. If several combinations of input values 502, 504 can cause the process to meet the primary control setpoint, the combination using the minimum fuel flow 26, 48 is selected as optimal. If the desired setpoint does not correspond exactly to discrete input values in the table, the correct input settings may be inferred by interpolation. Valves 28, 50, 64, 66, 70, 80 and dampers 106, 108, 110 are dynamically controlled by output drive signals in an improved closed-loop control, using a function of the process output value and time to recalculate and adjust the drive signals. |
