Method for controlling optimized burning in circulating fluid bed boiler

A circulating fluidized bed and boiler combustion technology, which is applied to fluidized bed combustion equipment, combustion methods, and fuels burned in a molten state, can solve the problems of affecting the fluidization state of the bed material, overshoot, and narrow adjustment range. The effect of solving the difficulty of coordinated control, obvious control effect and wide application prospect

Active Publication Date: 2007-02-21
南京科远智慧能源投资有限公司
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  • Abstract
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Problems solved by technology

[0007] 3. Big lag and uncertainty
[0010] 1. Use the coal feed to directly control the main steam pressure (boiler load). Since it takes about 9 to 11 minutes from the change of the coal feed to the change of the main steam pressure of the boiler, there is a very large lag, which often easily leads to overshooting. The main steam pressure fluctuates greatly, and the adjustment period is too long
[0011] 2. Use the primary air to control the bed temperature, and the main task of the prima

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  • Method for controlling optimized burning in circulating fluid bed boiler
  • Method for controlling optimized burning in circulating fluid bed boiler
  • Method for controlling optimized burning in circulating fluid bed boiler

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Embodiment Construction

[0051] The present invention will be further described below by taking a 440t / h circulating fluidized bed (CFB) boiler as an example. This example is developed on the platform of distributed control system (DCS), including the following steps:

[0052] A) Coordinated control of machine and furnace:

[0053] The design of the coordinated control system considers the adjustment, interlocking, protection, alarm and monitoring management, and controls the boiler and steam turbine as a whole.

[0054] In the coordinated control system mode, it can accept the 4-20mA ADS signal transferred from the power grid, and participate in the AGC operation of the power grid at a certain rate (3% rated load / min) within the range of the boiler's stable combustion load.

[0055] As a whole, the boiler steam turbine is coordinated and controlled, and the principle of direct energy (DEB) balance control is adopted to ensure the stable operation of the pressure before the machine. According to the...

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Abstract

A method for controlling combustion of circulation fluidized bed boiler includes using turbine to regulate load and using boiler to regulate pressure as well as using control system to receive load command when machine set is under coordination control system; carrying out uncoupling operation on load, main steam pressure, bed temperature and bed pressure of fluidized bed boiler when turbine load is changed greatly; and controlling carbon residual content in firepot for realizing energy balance control of machine set.

Description

1. Technical field [0001] The invention relates to an operation control method of a circulating fluidized bed (CFB) boiler, in particular to a control method for better controlling the combustion of a circulating fluidized bed boiler. 2. Background technology [0002] Circulating fluidized bed (CFB) boilers have developed rapidly in recent years due to their high efficiency, low pollution, and wide fuel adaptability, gradually replacing other boiler types. However, due to the special combustion process of CFB boilers, the problem of automatic combustion control has not been well resolved, which limits the large-scale popularization and application of CFB boilers. For a long time, CFB units have not been able to be put into the control of AGC, and cannot realize the function of participating in power grid peak regulation. [0003] The goal of circulating fluidized bed (CFB) boiler control is to ensure safe, stable and high-efficiency combustion of the boiler on the one hand,...

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Application Information

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IPC IPC(8): F23C10/28
Inventor 刘国耀胡歙眉梅建华仲丛庆
Owner 南京科远智慧能源投资有限公司
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