| 摘要 |
A burner installation comprises a stack 16, a burner 1, a fuel valve 4, an air valve 9 and a control device 20. The control device has a store 30 arranged to store pairs of values of air and fuel valve settings at various firing rates of the burner, and in use controls the air and fuel valve settings. The installation further comprises a stack flow regulator 15 for adjusting the flow of combustion products through the stack and a pressure sensing arrangement 26 for monitoring the pressure of combustion products downstream of the burner. Respective pairs of values of the setting of the stack flow regulator and a measured value from the pressure sensing arrangement are stored for pairs of values of air and fuel valve settings. The control device is arranged to receive a feedback signal from the pressure sensing arrangement for comparing an actual pressure value with a stored pressure value and to trim the setting of the stack flow regulator to cause the actual pressure value from the pressure sensing arrangement to move closer to the stored pressure value. |
