SU1117082A1 - System for automatic regulation of mill charging - Google Patents

Abstract

AUTOMATIC CONTROL SYSTEM FOR DOWNLOADING A MILL WITH A FUEL, including a fuel consumption regulator in a mill with an actuator drive actuator and setting device, an active motor power sensor with a filter. associated with the first input of the adder, and the flow sensor of the drying and ventilating agent into the mill, connected through a differentiator to the first input of the flow regulator, characterized in that, in order to improve the accuracy of the regulation, it is equipped with a motor - mill mill and an integro-differentiating converter, and a rotation speed sensor is connected to the second input of the adder with sign inverting, the output of the adder is connected to the second input through an integrating differential converter flow controller, and the output of the flow sensor (L of the drying and ventilating agent is connected to the third input of the flow controller.

Description

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The invention relates to regulating the loading of mills with raw fuel, and more specifically to devices for automatically controlling the loading of fuel to installations for the preparation of an air-fuel mixture 5 mainly for boilers with furnaces according to the direct injection scheme.

A device for regulating the loading of a mill is known, including 10 a loading controller with an actuator of the fuel supply, an active motor power sensor and a filtering unit C13.

The disadvantage of this tS device is the low accuracy of the adjustment, since it uses the uninformative parameter, because with the help of the fctr only a part of the useful signal contained in the signal of active power is used.

engine mills about loading mills.

The closest to the invention to the technical essence is the system of automatic control of the mill fuel loading, including a fuel flow regulator in the mill with an actuator drive actuator and setting unit, an active motor power sensor with a filter connected to the first input of the adder , and the flow sensor of the suspending agent into the mill, connected via a differentiator to the first input of the flow regulator C2. -zg

A disadvantage of the known system is also the low accuracy of the regulation, since the regulation of the fuel flow is conducted on the basis of incomplete information on the loading of the mill. In addition, for deep changes in the boiler load, the extremum of the economical operation of the installation is shifted and the need to correct the installation load with fuel is required. In the known device such static correction is absent. This also reduces the accuracy of the adjustment.

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

The goal is achieved by the fact that the system 50 for automatically controlling the charging of the mill with fuel, including a fuel consumption regulator in the mill with an actuator drive actuator and setting device, a sensor of the active mill motor with a filter connected to the first input of the adder, and flow sensor

drying-venting agent in the mill, connected through the differentiator to the first input of the flow controller, equipped with a speed sensor of the shaft of the system motor and an integrating-differentiating converter, and the second speed sensor is connected to the second input of the adder with the sign inverting the input of the flow controller, and the output of the flow sensor of the drying and ventilating agent is connected to the third input of the flow controller.

The drawing shows the proposed system.

The system contains a fuel consumption regulator 1 with an actuator of a coal powering actuator 2 and a setting device 3, a sensor 4 of the active power of the mill motor with filter 5, a differentiator 6 with a sensor 7 of the actual ventilating agent connected in series to the sensor 8 of the rotation speed of the mill shaft adder 9 and converter 10 At the same time, the output of sensor 4 with filter 5 is connected to the second input of adder 9 with sign inversion, the output of converter 10 is connected to the first input of regulator 1, the output of differentiator 6 is the second, and the output of the sensor 7 to the third input of the regulator 1.

The system works on the principle of complexing signals of different physical nature, which indirectly characterize the loading of the mill. The signal from the active power sensor 4, after appropriate filtering by the filter 5, is summed with the signal from the sensor 8 and is converted using an integro-differentiating converter 10.

As a result, a useful signal is formed at the output of the adder 9, which is proportional to the change in the mill load of the fuel, and the converter 10 of this signal provides an increase in the dynamic measurement accuracy. This is due to the fact that the measurement of loading is carried out on two channels, which increases the information content of the control device.

Inverting the sign from sensor 4 before summing is explained by that.

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that when the mill load changes, the signals from sensors 4 and 8 have different signs. For example, as the mill load increases, the speed of the machine shaft decreases, and the power consumption of the active increases.

This provides an increase in the accuracy of regulating the fuel supply by the regulator 1 by means of a feeder of cfy fuel. In transient conditions, which are characterized by changes in the flow rate of the drying and ventilating agent, the regulator 1 receives a signal from differentiator 6 on the rate of change in the flow rate of the drying venting agent. This eliminates the change in the amount of fuel in the mill with changes in its performance (transients).

At the same time, with deep changes in the performance of the dust system (determined by the change in the load of the boiler), in many cases a change in the concentration of fuel in the air mixture is required. Last dependent

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on the amount of fuel in the system mill - separatrr, i.e. when the productivity of the mill changes, it is necessary to change its load accordingly (for example, when grinding coal). To do this, a static connection is introduced from sensor 7 to a separate input of controller 1. It is advisable that the system be equipped with

additional dynamic correction of the flow rate signal of the dry ventilating agent.

As a result, the accuracy of adjusting the loading of the mill to

wide range of loads.

The economic effect of the implementation of the invention is achieved by improving the accuracy of load control.

mills, respectively, the accuracy of stabilizing the concentration of fuel in the primary fuel-air mixture, reducing fluctuations in excess air and reducing heat loss from

exhaust gases.

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Claims (1)

AUTOMATIC CONTROL SYSTEM FOR LOADING THE MILL with fuel, which includes a fuel consumption regulator in the mill with an actuator for the fuel feeder and a setter, an active engine power sensor with a filter connected to the first input of the adder, and a flow sensor for the drying-ventilating agent in the mill, connected via a differentiator to the first input of the flow regulator, characterized in that, in order to improve the accuracy of regulation, it is equipped with a sensor for the speed of rotation of the shaft of the engine - chalk system maths and integrodifferentsiruyuschim converter, wherein the second input of the adder is connected with the inverted sign of the rotation speed sensor, the output of the adder via integrodifferentsiruyuschy converter is connected to the second input 59 pa flow regulators, and the output of said venting and drying agent flow sensor is connected to a third input of the flow regulator.