| 摘要 |
PURPOSE:To constantly keep the temperature of the exhaust gas at an appropriate value so that no adverse effect is applied to devices such as bag filters and the like by circulating and fluidizing a part of the exhaust gas through a recirculation passage when the temperature of the exhaust gas is lowered. CONSTITUTION:When the temperature of the exhaust gas reaches a temperature below a preset value by a signal from a signal generator 14, a temperature adjusting meter 15 opens a damper 6 and recirculate to heat a part of the exhaust gas within an exhaust gas passage 3 to a hollow tower portion 2 so as to increase the temperature of the exhaust gas at the inlets of the bag filters 8. In this case, an air flow quantity signal from a flow quantity meter 13 is supplied to the temperature adjusting meter 15. If a cascade control is carried out by using this flow quantity signal as an instruction signal of the damper 6 in precedence to an exhaust gas temperature signal, no delay is introduced in the exhaust gas temperature control.
|
