Automatic regulation method for comprehensive combustion in circular fluidized bed boiler

A circulating fluidized bed and automatic adjustment technology, which is applied to fluidized bed combustion equipment, combustion methods, fuels burned in a molten state, etc., can solve the problems of automatic adjustment that cannot be long-term, stable input, adjustment out of tolerance, etc., and achieve high inertia , Eliminate disturbances, and improve economic benefits

Inactive Publication Date: 2003-09-10
BEIJING HOLLYSYS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this way, the automatic adjustment can only be operated in a local range and in a stable environment. If the load or coal type changes greatly, the adjustment will be out of tolerance, resulting in the automatic adjustment not being able to be used stably for a long time.

Method used

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  • Automatic regulation method for comprehensive combustion in circular fluidized bed boiler
  • Automatic regulation method for comprehensive combustion in circular fluidized bed boiler
  • Automatic regulation method for comprehensive combustion in circular fluidized bed boiler

Examples

Experimental program
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Embodiment Construction

[0020] Referring to Fig. 1, in the step (1) of technical case:

[0021] The furnace negative pressure adjustment adopts the mode of single-loop adjustment, that is, the furnace negative pressure given value and the furnace negative pressure process measurement value enter the furnace negative pressure PID control module, and the PID control module outputs to the soft hand operator module, and the soft hand operator The module outputs to the external actuator - the outlet baffle of the induced draft fan or the frequency converter, and the air supply volume is used as feedforward;

[0022] The parameters of the furnace negative pressure PID control module are set as: proportional band P=120%~180%, integration time Ti=40~80s, output change rate=0.3%~1%; air supply volume feedforward is set as: Differential coefficient Kd2 = 1 ~ 2, differential time Td2 = 10 ~ 20s.

[0023] In the furnace negative pressure single-loop adjustment, when there are two actuators, a balance module of ...

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Abstract

The present invention relates to automatic control and regulation in the industrial combustion reaction process between solid fuel and air. The automatic regulation process for comprehensive combustion in circular fluidized bed reactor features fast load regulation with blowing rate, load stabilization and bed temperature regulation with coal feeding amount, fast air/coal ratio regulation, oxygen regulation to ensure the economical efficiency and negative regulation with induced draft. The regulation mode includes single loop for regulating negative pressure in hearth, composite cascade loop for regulating boiler load and bed temperature, and cascade loop for regulating oxygen content in fume. Compared with traditional techonlogy, the present invention has greatly improved stability, fast disturbance elimination and high economical utility.

Description

technical field [0001] The invention belongs to a method for automatically controlling and adjusting the industrial process of using solid fuel and air to react and burn. Background technique [0002] The combustion system of a circulating fluidized bed boiler is a nonlinear system with large lag, strong coupling, and time-varying. An adjusted parameter is affected by several adjustment parameters at the same time. Control multiple parameters such as primary air volume, material return volume, and slag discharge volume; at the same time, one adjustment parameter affects multiple adjusted parameters. For example, the coal feed volume not only affects the main steam pressure, but also affects the bed temperature, furnace temperature, excess air system and SO 2 content and other parameters. For load adjustment, when the circulating fluidized bed boiler burns different coal types and different loads, the combustion and heat exchange processes in the furnace are different, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23C10/00F23C10/28
Inventor 张小辉郭敏
Owner BEIJING HOLLYSYS
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