SU948011A1 - Device for controlling mill loading - Google Patents

Abstract

DEVICE ROORING DOWNLOAD MELSHR., Containing a regulator with an actuator. load sensor mill 1 and a differentiator with air flow sensor, and the differentiator is connected to one of the controller inputs, that is, so that, in order to improve the control accuracy, it is equipped with a load sensor of the boiler, a process control sensor combustion, two converters and a correction unit, the boiler load sensor through the first converter connected to one input of the correction block, the code of which is connected to the other controller input, the process control sensor g rhenium through vto3 swarm converter is connected to the other input of the correction unit (A. and mill load sensor is connected to a corresponding input of the regulator.

Description

This invention relates to the field of regulating the loading of raw fuel mills, which work mainly on a coal mill pulp mill. .

An automatic control system is known in which a device for increasing the curvature of a signal as the boiler load decreases is applied. A control system is also known in which the oxygen content sensor is connected to the combustion controller.

However, such systems are tested. when regulating mainly boiler units with industrial dust binders. In the regulation of the supply of Toshva

CD

Directly blown boilers, in particular, with dust mills based on hammer mills, are well-known control systems that are inoperative.

The closest device is to set up the milling of the mill load .1, which contains a regulator with an actuator, a loading sensor, a mill and a differentiator with air flow, and the differentiator is connected to one of the regulator inputs. This device ensures that the mill is loaded (a sort of light generating the fuel layer and the concentration of the air mixture), regardless of the load of the boiler unit and the quality of the fuel (combustion quality) using the coaxial signal BMO With deep changes in loading, the increase in the mixture of known mixtures occurs account accumulated in the mill

Pieces of ready-made drink and deepening of grinding fineness (RaQ Var). When the quality of the fuel changes, besides this, the loading of the mill, which is carried out by the operator, is required.

This leads to a decrease in the quality of the combustion process and at the same time to a decrease in the economics of the grinding plant.

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

The goal is achieved by the fact that the mill load control device containing a regulator with an actuator, a mill load sensor and a differentiator from an air flow sensor, the differentiator connected to one of the regulator inputs, is equipped with a boiler load sensor, a combustion process control sensor, two converters and a corrective unit, the boiler load sensor being connected via the first converter to one input of the corrective unit whose output is connected to another input egul torus sensor monitoring the combustion process through the second converter is connected to. the other input of the correction unit, and the mill load sensor is connected to the corresponding input of the regulator,

The device is represented in the drawing and contains a regulator 1, Ds tchik 2 mill loads, a sensor for the flow rate 3, a differentiator 4, a sensor 5

load of the boiler unit (e.g. feedwater flow rate), combustion quality sensor 6 (e.g. oxygen content in flue gases), converters 7, 8, correction device 9 and actuator 1

The device works as follows.

The useful signal from sensor 2 is transferred to regulator 1, which, by means of actuator 10, stabilizes the loading of the mill at a predetermined value (Gc const). With deep changes in the load of the steam generator or the qualitative composition of the fuel, the required loading variation of the mill (according to the layer's generating capacity) is provided by the arrival of a correction signal from device 9 using signals from sensors 5 and 6. Converters 7 and 8 provide the necessary conversion of static characteristics of sensors 5 and 6 , combining them (static characteristics), the presence of a disappearing signal from sensor 3 will increase the system speed in transient conditions,

As a result, the mill load (respectively, the generation capacity of the fuel layer in the mill) becomes functionally dependent on the load of the steam generator and the combustion quality of the Гс f (W |, Og). This ensures the stabilization of the fineness of grinding in the conditions of varying fuel quality and variable loads and leads to an improvement in the quality of the combustion process, the economics of the grinding plant, and an increase in the range of control.

This device will increase the accuracy of the adjustment.

Claims (2)

REGULATORY DEVICE 'LOADING MILLS' containing a regulator with an actuator. 2 a mill loading sensor and a differentiator with an air flow sensor; the differentiator is connected to one of the regulator inputs, which is different in that, in order to improve the control accuracy, it is equipped with a boiler load sensor, a combustion process control sensor, two converters and a corrective unit, the boiler load sensor through the first converter is connected to one input of the correction unit, the output of which is connected to another regulator input, the combustion process control sensor through Torah converter is connected to the other input of the correction unit, and the mill load sensor is connected to a corresponding input controller.