| 摘要 |
In the present invention there is disclosed a method for automatic controlling combustion process in a furnace with a simultaneous measurement of free oxygen (Oi2) content and carbon monoxide (CO) content in waste gases, with defined concentration (Oi2z) of free oxygen (Oi2) determined on the base of measured and defined concentration (COiz) of carbon monoxide (CO), said method being characterized by automatic reduction of the defined concentration value (Oi2z) until equality of the carbon monoxide measured and defined concentration value (COiz) is reached. So obtained reduced defined concentration value (Oi2z) changes spontaneously by a dynamic and static concentration value ({DELTA} Oi2zd + {DELTA} Oi2zs) of free oxygen (Oi2), and this changed value is the reduced in a first defined time interval (T) by a dynamic value of concentration ({DELTA} Oi2zd) while maintain said reduced defined concentration value (Oi2z) until the end of the first time interval (T), beginning at the moment when equality of the measured and defined (COiz) concentration is reached. If, after a second time interval (T), the measured (COiz) concentration value is less than the defined one, said reduced changed defined (Oi2z) concentration value is automatically reduced unit the defined (COiz) concentration value is reached. If, after the first time interval (T), the measured (COiz) concentration value is greater that that defined, than the reduced changed defined (Oi2z)concentration value is increased by the static concentration value ({DELTA} Oi2zs) and so increased value thereof is then maintained for the second time interval (T). After lapse thereof said increased defined concentration value (Oi2z) is automatically reduced provided, the measured concentration value (COiz) does not exceed the defined one, whereby any subsequent defined time interval (T) is equal as the first time interval (T). A system for automatic control of combustion process within a furnace comprises a signal counter (3, 19) of coal conveyor belt speed, sensors (2) of measured concentration value (COiz), and path (Di22) of a defined concentration value (Oi2z) signal is connected with the path (Di222) of the (Oi2z) defined concentration variable signal via a switching system (6), whereby said path (Di222) comprises a programming device (4) having two inputs and one output connected to the input of the switching system (6), wherein said device first input (4) is connected to the sensor (2) of the measured (COiz) concentration value while the other input thereof is connected to a defined (COiz) defined concentration value post (8). |
