Fluidized Bed Boiler Control and Combustion Optimization System

A fluidized bed boiler, combustion optimization technology, applied in the direction of fluidized bed combustion equipment, fuel burned in the molten state, combustion type, etc., can solve the problem of difficult control of the boiler system, and achieve the effect of improving control performance

CN107023825BActive Publication Date: 2019-01-22XIAN IBL TECH DEV +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2019-01-22

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Abstract

The invention discloses a fluidized bed boiler control and combustion optimization system. The problem that a fluidized bed boiler system is not easy to control for a long time is solved. According to a method, a control strategy of combining an advanced control algorithm and a conventional control algorithm is adopted, and continuous, economical and stable operating of the boiler system is guaranteed; multivariable model-free adaptive control is adopted, and decoupling control of the fuel quantity and the air supply quantity over the bed temperature under the variable load work condition is achieved; and a nerual network technique is adopted for building a boiler combustion prediction model, online calculation of the boiler efficiency and NOX and SOX emissions is achieved, a multi-objective optimization function is constructed according to the prediction result, a combustion self-optimization algorithm is adopted, the flue gas oxygen content and the bed temperature are optimized constantly so as to adapt to work condition changes, and a fluidized bed boiler can operate in an optimal combustion area.
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Description

technical field

[0001] The invention relates to the technical field of industrial automatic control, in particular to a control and combustion optimization system of a fluidized bed boiler system. Background technique

[0002] As a clean coal combustion technology, fluidized bed boilers have been widely used in the world. According to the process flow, fluidized bed boilers are mainly divided into steam-water system and combustion system. The combustion system has multi-variable, strong coupling and parameter time The variable and complex system characteristics make its control work more difficult, mainly in the control of bed temperature and main steam pressure, as well as the control between the air supply volume and the induced air volume.

[0003] At present, the domestic circulating fluidized bed boiler control system mainly adopts a single-loop control system, which controls the material bed temperature by controlling the ratio of primary air and secondary air. When ad...

Examples

Embodiment 1

[0144] The #3 boiler of a power plant, the existing equipment status: the boiler model is DG483 / 13.7-II1, which is a 483t / h circulating fluidized bed boiler designed and manufactured by Dongfang Boiler Factory. The boiler is mainly composed of a membrane water-cooled hearth, two steam-cooled cyclone separators and a rear shaft (HRA) covered by a steam-cooled wall.

[0145] The model of the high-pressure vulcanization fan is L925WDB, the quantity is 2 sets, and the medium flow rate is 282m 3 / min, the maximum pressure difference of the working medium is 58.8kPa, the spindle speed is 780r / min, the motor model is YKK-5001-8, the motor voltage is 6000V, the motor current is 51.3A, the motor power is 400kW, and the motor speed is 745r / min; The model is VZ41-2950F / S1, the quantity is 2 sets, and the medium flow rate is 488604Nm 3 / h, full pressure 11252Pa, speed 985r / min, equipped motor model is YSPKK710-6, motor voltage 6000V, motor current 237A, motor power 2000kW, motor speed 99...