SU983388A1 - Apparatus for automatic control air feed into boiler unit fire box - Google Patents

Description

one

The invention relates to a power system, in particular to the automation of the processes of supplying air to the furnace of a boiler unit.

A device for automatically regulating the supply of air to a furnace of a boiler unit with two blower fans having guide devices containing a load unit of the boiler unit and a common air regulator with an air flow sensor connected to it, a sensor of fuel consumption through the differentiator and directly and sensor of the chemical composition of flue gases through the correction device 1.

A disadvantage of the known device is the impossibility of maintaining optimal excess air at the occurrence of large disturbances in the event of a load change, for example, in emergency power control of power units, as well as during switch speeds of blower fans, which often occurs when the power unit operates in an air control signal. parameters.

The aim of the invention is to improve the accuracy of regulation.

The goal is achieved by the fact that the device consists of two control loops, in one of which the output of the air regulator is connected by one of the guides of the blower fan, and the other control loop additionally contains a control device connected at the outlet to the other guiding apparatus, equipped with a position sensor, and an adjustment correction unit with a speed sensor of both fans connected to the input of the regulating device.

In addition, the input of the regulating device is connected directly to the load unit of the boiler unit, and directly to the position sensor through a setting correction block or to a position sensor directly, and to the load unit of the boiler unit through a setting correction block.

Claims (3)

FIG. 1 shows a diagram of one of the embodiments of the device, in which the setting correction unit is turned on between the interval 39 by the regulating device and the load sensor of the boiler unit; in fig. 2 is a diagram of a variant of the device with the adjustment correction block turned on between the regulating device and the sensor positioning device guide / device of another blower fan. In the diagram (Fig. 1) the device contains guide devices 1 and 2 of two two-speed blower fans, regulator 3 common air with sensors 4 and 5 of fuel consumption and air acting on the directing device I of the blower fan, the sensor 4 being connected to the controller 3 directly and through the differentiator 6, the sensor 7 of the chemical composition of flue gases, Connected to the controller 3 via the correction device 8, regulates to the device 9 acting on the guide device 2, the sensor 10 of which is connected to the regulating device 9, the set And the load of the boiler unit connected to the input of the regulating device 9 through the block 12 of the offset { and settings whose inputs are connected to the sensors 13 and 14 of the position of the speed of the blower fans. In the circuit (Fig. 2), the sensor 10 of the position of the guide vane 2 is connected to the regulating unit 9 through the adjustment correction unit 12, and the output of the unit 11 of the load of the boiler unit is connected to the input of the regulating device 9 directly. The device (Fig. 1) works as follows. When the load of the boiler unit changes, the regulating device 9, receiving signals from the load unit 11 of the boiler unit and the sensor 10 position of the guide apparatus 2, acts on the guide apparatus 2, maintaining its position in accordance with the task received from the unit 11 load of the boiler unit, The quality of which can also be used to set the load of the boiler unit or fuel consumption sensor. The control device 9, regardless of the operation of the common air regulator 3, with a maximum speed, works out the load disturbance share assigned to the guide unit 2. At the same time, the common air regulator 3 receives the signal from the fuel consumption sensor 4 and the feedback signal from the sensor 5, the air flow, and the correction signal from the sensor 7 of the chemical composition of flue gases through the correction device 8 acting on the guide device 1, maintains the required fuel-air ratio. The signals from the sensor 13 and 14 of the position of the speed of the blower fans affect the adjustment correction block 12, which changes the signal input from the boiler load generator 11 to the controller 9 (thereby changing the statistical ratio of the signals from the boiler load generator 11 and the sensor 10 of the position of the guiding device 2) so that in a static state the required distribution of the load of the blower fans is maintained at any position of their speed. Thus, when switching the speed of the blower fans, the regulating device 9, receiving the corrected preset correspondence of signals from the setpoint 11 of the load of the boiler unit and the position sensor 10; of the guide vehicle 2, at the time preceding the change in the fuel-air ratio, transfers the guide apparatus 2 to the position corresponding to the new static state, and the regulator 3 of total air, fully influences the guide device 1 to restore the required fuel-air ratio. The device (Fig. 2) works similarly to the device (FNG. 1) except that the adjustment correction block 12, receiving a signal oG of changing the speed of the blower fans, corrects the statistical ratio of signals from the setpoint 11 of the load of the boiler unit and the sensor 10 of the guide vanes 2, changing the degree of input of the signal from the sensor 10 to the position of the guide device 2 on the regulating device 9. Thus, the proposed device ensures the quality control of the fuel-to-air ratio. Embodiments of the device (Fig. 1 and 2) to the technical essence and efficiency are equivalent. As a signal from the unit 11 of the load of the boiler unit, the signal from the unit setter of the load of the boiler unit or from the fuel consumption sensor can also be used, which is of no fundamental importance. The authors of the invention prefer the variant using the signal from the load master of the boiler to the unit because its changes are preceded by a change in fuel consumption and the load of the boiler unit. Claim 1; An automatic control unit for supplying air to the furnace of a boiler unit with two blower fans with guide vanes containing a load sensor of the boiler unit and a common air regulator with an air flow sensor connected to it, an air flow sensor through the differentiator and directly and a sensor The chemical composition of the flue gases through a correction device, characterized in that, in order to adjust the accuracy, it consists of two control loops, the bottom of the KOTopbix, the common air regulator output is connected to one of the guiding devices of the blower fan, and the other control loop further comprises a regulating device connected downstream to the other guiding device equipped with a position sensor, and a setting correction unit with speed sensors of both valves tori connected to the input of the regulating device. 2. The device according to p, 1, and then, is that the input of the regulating device is connected to the load unit of the boiler unit directly, and to the position sensor through a setting correction block. 3. The device according to claim 1, of which, the input of the regulating device is connected directly to the position sensor, and to the load unit of the boiler unit through a setting correction block. Sources of information taken into account in the examination 1. USSR author's certificate N 732627 cells, F 23 N 3/00, 1980. YU ff f f / 1Z -H I - n Phi1.1 ff 12 / L 2