Coordinative control method for supercritical unit boilers quickly adaptive to change of heat value of fire coal
A supercritical unit, coal-fired calorific value technology, applied in control systems, lighting and heating equipment, steam generation, etc., can solve the problems of unstable operation of the fuel control system, fuel changes, etc., and achieve fast and real-time coal-fired calorific value. Effect
Active Publication Date: 2012-07-11
云南电力试验研究院(集团)有限公司
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Problems solved by technology
If the fuel quantity is corrected by the steam flow rate, when the turbine valve is disturbed (such as a frequency adjustment), the steam flow rate will change, which will inevitably lead to a change in the fuel, making the fuel control system unable to operate stably
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[0042] See figure 1 , figure 2 , a method for coordinating control of supercritical unit machine furnaces for fast adaptive coal calorific value changes, the method includes the following steps:
[0043] The parameters representing the change of the calorific value of coal combustion are comprehensively and quickly calculated from the steam turbine regulating stage pressure, steam-water separator pressure, coal feed rate, and unit load parameters;
[0044] By calculating the ratio of the boiler heat signal to the inertia link of the coal quantity and the time delay, after filtering, it can quickly represent the coal combustion calorific value parameter:
[0045] ) (1)
[0046] HR—heat signal (MW);
[0047] M—coal supply, t / h;
[0048] - filter module;
[0049] LEADLAG—inertial link module;
[0050] τ—lag time, s;
[0051] R—coal calorific value parameter;
[0052] The heat signal uses a conventional algorithm:
[0053] ...
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A coordinative control method for supercritical unit boilers quickly adaptive to change of the heat value of fire coal includes quickly calculating the heat value of the fire coal in real time by the aid of parameters including regulating-stage pressure of a steam turbine, pressure of a steam and water separator, coal feeding quantity, load of units and the like by means of combining characteristics of coordinative control objects of the supercritical fossil power units; then adaptively controlling the heat value of the fire coal by the aid of main control systems for fuel, coordination and the like according to the calculated heat value of the fire coal; and finally calculating load instructions of the boilers by the aid of an improved energy balancing method, forming a core control strategy, combining quick adaptive control for the heat value of the fire coal, and forming the coordinative control method for the unit boilers quickly adaptive to the change of the heat value of the fire coal. The calculated heat value of the fire coal can respond to the change of the heat value of the fire coal within thirty seconds, and coordinative control of the unit boilers can be automatically adjusted and a subsystem is automatically adjusted into a corresponding state within two minutes; even if the heat value of the fire coal is in large step disturbance, coordination of the units and control of the subsystem do not need manual intervention under various working conditions such as a stable state, variable load, variable pressure and the like of the units of coordinative control of the unit boilers and the subsystem and various disturbances on boiler and steam turbine sides, and main parameters of the load, pressure and the like of the units can be controlled within specified ranges; and precisions of main controlled parameters of the units can be greatly improved as compared with original convention control, and simultaneously, a safe and economical running level of the units can be improved.
Description
technical field [0001] The invention belongs to the field of thermal automatic control of thermal power plants, and relates to a coordinative control method for a supercritical unit furnace that can quickly adapt to changes in the calorific value of coal-burning. Background technique [0002] At present, my country's electric power is still dominated by thermal power generation, and this status quo will continue for decades. Supercritical units have the advantages of large size and high thermal efficiency. At present, my country's newly built and rebuilt thermal power units are mainly supercritical units. With the gradual elimination of small-capacity thermal power units, supercritical units will become the main generating units. With the development of the electricity market, the coal combustion of many domestic thermal power units often deviates from the design value. Coal quality deteriorates and changes greatly, and the controlled object of coordinated control becomes a...
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IPC IPC(8): F22B35/00
Inventor 刘友宽卢勇苏适翟伟翔李萍赵明杜景琦李长更唐立军赵永辉潘巾杰
Owner 云南电力试验研究院(集团)有限公司
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