Thermal power unit coal-burning thermal value real time monitoring method and thermal value observer

Abstract

The invention relates to a thermal power unit coal heat value real-time monitoring method and a heat value observer thereof. The invention comprises the following steps: 1) based on the dynamic characteristics of the thermal power unit, the heat value observer is established by the energy conservation law; 2) during the stable operation of an actual operating unit under the conditions of the designed coal rank and various loads, the corresponding relation among all the operation parameters of the actual operating unit can be searched in a DCS control system; 3) according to the probability statistics on the operation parameters of the actual operating unit, the static configuration and the dynamic configuration of the parameters of the unit model are carried out, and thus the unit model can be perfectly matched with the actual operating unit; 4) according to the coal consumption signal which is measured in site and the current operation parameters of the unit, the heat value observer can get a heat-value modified parameter through calculation, and the modified parameter can modifies the coal consumption signal in site to obtain the standard coal consumption signal. The application in site shows that the monitoring method and the observer can perfectly make the online real-time monitoring of the changes of the coal heat value, and thus the control system can perfectly overcome the interference on the boiler combustion due to the coal quality variation.

Description

technical field [0001] The invention relates to a method and device for monitoring the calorific value of coal combustion, in particular to a method for real-time monitoring of the calorific value of coal combustion of a thermal power unit and a calorific value observer applied in the field of automatic control. Background technique [0002] With the continuous development of my country's electric power industry, the power generation capacity of the unit thermal power generation unit has also been greatly improved, from the original 300MW subcritical unit to 600MW supercritical and 1000MW ultra-supercritical. With the improvement of unit parameters, higher requirements are put forward for the automatic control of power plants. In power plant automation control, fuel control is the most basic control part, and the effect of fuel control directly affects the control level of the whole unit. The high energy consumption of power generating units and coal mining have formed a cu...

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Problems solved by technology

The disadvantage of this method is: coal enters the furnace and burns is a high-order inertial link with pure delay, and its delay time and inertia time vary with the combustion conditions of the boiler. Using the third-order inertial link It is difficult to express the dynamic characteristics of boiler...

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