A system and method for predicting the output power of a supercritical circulating fluidized bed unit
A circulating fluidized bed and unit power technology, applied in general control systems, control/regulation systems, instruments, etc., can solve problems such as large differences in the dynamic characteristics of machine-furnace
Active Publication Date: 2021-02-02
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology
The multi-variable strong coupling characteristics of the supercritical CFB unit are concentrated in the mutual influence of the control and adjustment on both sides of the machine furnace, and the dynamic characteristics of the machine furnace are quite different
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Embodiment 1
[0137] a. Taking a 600MW supercritical CFB unit as the research object, the power plant boiler is a supercritical once-through furnace developed by Dongfang Boiler Factory. Fluidized bed combustion method. The boiler design coal is high ash, high sulfur, low calorific value lean coal, as shown in Table 1.
[0138] Table 1. Design coal quality of Baima 600MW supercritical circulating fluidized bed boiler
[0139]
[0140] Utilize method of the present invention to obtain following supercritical CFB boiler unit nonlinear control model:
[0141]
[0142] b. Identification of fuel side parameters and steam water side static parameters
[0143] According to the mechanism process from the amount of coal fed to the calorific value of the furnace in step 1, the operation data is substituted to get K=0.00018.
[0144] When the unit is running stably, the parameters are approximately stable. for l,k 0 , k 1 , selected four groups of representative steady-state values from ...
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The present invention relates to the technical field of power station boiler unit control, and provides a supercritical circulating fluidized bed unit output power prediction system and method. Work model, and determine the parameters in each model; identify the functional relationship between the key parameters of the unit; and then establish the output power prediction model of the circulating fluidized bed unit, and predict the dynamic unit power according to the input data and coal quality data of the unit’s real-time operation. The invention solves the technical problem that the control and adjustment on both sides of the machine furnace influence each other caused by the multivariable strong coupling characteristics of the supercritical CFB unit, and the dynamic characteristics of the machine furnace are greatly different; the system control model is established to clarify the input and output relationship, The output power is predicted on the basis of knowing the input quantity at present and several times in the future, and the change trend of the output quantity is predicted in advance; the method of the invention has high prediction accuracy and is suitable for popularization and application.
Description
technical field [0001] The invention relates to the technical field of power station boiler unit control, in particular to a supercritical circulating fluidized bed unit output power prediction system and method. Background technique [0002] Driven by the energy conservation and emission reduction of energy companies around the world, China is under increasingly severe pressure to eliminate outdated production capacity and promote comprehensive energy conservation planning and transformation of coal power units. Compared with pulverized coal boilers, Circulating Fluidized Bed (CFB) boiler technology has a wider range of fuel adaptability and lower air pollution control costs, and has developed into the most successful practical clean coal combustion technology one. At present, the vast majority of CFB units in my country are subcritical parameters with the rated gauge pressure of the superheater outlet steam at 14-22.2Mpa, which does not have obvious advantages in achievin...
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IPC IPC(8): G05B13/04
CPCG05B13/042
Inventor 高明明洪烽刘吉臻严国栋陈峰伯运鹤李玉红
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)