Unit plant control system and method based on real-time online analysis of coal quality

Abstract

The invention discloses a unit plant control system and method based on real-time online analysis of the coal quality. The system comprises a raw coal hopper, a raw coal hopper outlet pipeline, a coalfeeder belt, a weighing instrument, a coal feeder speed change motor, a coal feeder outlet pipeline, a coal mill, a coal mill inlet primary air pipeline, a primary air volume measuring element, a boiler hearth, a coal quality online monitoring module, a coal feeding controller, an air feeder, an air feeder variable-output element, an air supply pipeline, a secondary air volume measuring element and a secondary air controller. By means of the method, on the basis of acquirable coal-as-fired online data meeting the real-time operation control requirement, the precise fuel and air distribution of a thermal power generating unit is realized, and the practical value is remarkable.

Description

technical field [0001] The invention belongs to the technical field of automatic control of thermal power plants, and in particular relates to a unit unit control system and method based on real-time online analysis of coal quality. Background technique [0002] At present, coal quality and even coal types are common in my country's thermal power units. The coal quality measurement lags behind, which seriously affects the process control of thermal power units, especially the setting of key parameters of fuel and air distribution systems. [0003] In the existing coordinated control of thermal power units, a simple closed-loop control is generally adopted for the calorific value correction of the fuel system, and the corrected coal quantity is obtained by multiplying the actual total coal quantity by the calorific value correction coefficient as the adjusted quantity, corresponding to the unit load The amount of standard coal coal is used as the set value, and the two are se...

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Problems solved by technology

[0007] 2. Poor calibration matching

[0010] To sum up, under the actual situation of coal quality fluctuations and lagging coal quality measurement of thermal power units in my country, the control logic of the traditional coordination system and combustion system cannot fundamentally realize the real-time optimal correction of fuel and air distribution, and thus cannot obtain more Precise coordination and combustion control effect, which has become a key problem to be solved urgently

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