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Furnace desulphurization optimization control method for circulating fluidized bed

A circulating fluidized bed, optimized control technology, applied in the direction of program control, comprehensive factory control, comprehensive factory control, etc., can solve the problems of increasing costs, affecting boiler load, increasing operating costs, etc.

Inactive Publication Date: 2015-05-13
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Claims
  • Application Information

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Problems solved by technology

Obviously, this concentration adjustment method has serious hysteresis and cannot fundamentally play the role of adjustment and control; secondly, due to the increasingly stringent requirements of the country on flue gas emission indicators, the desulfurization efficiency of most CFB boilers in China is still only At about 80%, if you want to achieve a higher desulfurization efficiency, you need to add a large amount of desulfurizer, a large amount of limestone will decompose in the material layer, causing the bed temperature to drop, affecting the load of the boiler, and the large consumption of limestone will make Ca The / S molar ratio increases, and the operating cost increases
Moreover, excessive desulfurizer will bring a large amount of additional ash and physical heat loss, and at the same time increase the wear of the furnace, affect the combustion conditions and the efficiency of the boiler, thereby increasing the cost and affecting the economy of the boiler; thirdly, the coal quality Poor adaptability to changes, resulting in high limestone consumption and high operating costs
After the change of coal quality, the fixed Ca / S ratio is still used to adjust the feeding amount of limestone, resulting in a serious waste of limestone raw materials and a substantial increase in cost

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  • Furnace desulphurization optimization control method for circulating fluidized bed
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  • Furnace desulphurization optimization control method for circulating fluidized bed

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Embodiment Construction

[0077] The present invention proposes a furnace desulfurization optimization control method for a circulating fluidized bed. The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0078] figure 1 Shown is a schematic diagram of a circulating fluidized bed furnace desulfurization optimization control system, including the data communication subsystem, the sulfur online correction subsystem, the sulfur dioxide prediction subsystem, and the limestone control subsystem; among them, the data communication subsystem and the DCS system The OPC server communication software interacts with data data, the sulfur content online correction subsystem is connected to the data communication subsystem, the sulfur dioxide prediction subsystem is connected to the sulfur content online correction subsystem and the data communication subsystem, and the limestone control subsystem is connected to the sulfur dioxide predictio...

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Abstract

The invention belongs to the technical field of circulating fluidized bed boilers and discloses a furnace desulphurization optimization control method for a circulating fluidized bed. An optimization control system of the furnace desulphurization optimization control method comprises a data communication subsystem, a sulfur content online correction subsystem, a sulfur dioxide prediction subsystem and a limestone control subsystem; data interaction is performed on the data communication subsystem and OPC server communication software of a DCS system; the sulfur content online correction subsystem is connected with the data communication subsystem; the sulfur dioxide prediction subsystem is connected with the sulfur content online correction subsystem and the data communication subsystem; the limestone control subsystem is connected with the sulfur dioxide prediction subsystem and the data communication subsystem. According to the furnace desulphurization optimization control method for the circulating fluidized bed, a sulfur dioxide prediction model and a coal sulfur content self-adaptive correction method are established and accordingly the feeding amount of the limestone can be timely and dynamically adjusted, the excess emissions of the sulfur dioxide and the excessive use of the limestone and other resources are avoided, and the practical value in engineering is high.

Description

technical field [0001] The invention belongs to the technical field of circulating fluidized bed boilers, and in particular relates to an optimal control method for desulfurization in a circulating fluidized bed furnace. Background technique [0002] Circulating fluidized bed combustion technology is one of the clean coal combustion technologies. This technology adds coal and desulfurizer to the bed of the combustion chamber, and blasts air from the bottom of the furnace to suspend the bed for fluidized combustion. Today, when environmental protection is attracting attention, fluidized bed combustion has low NO due to low-cost desulfurization technology in the furnace and low-temperature combustion x The inherent characteristics of emissions make circulating fluidized bed boilers the preferred thermal equipment in high-sulfur coal areas. As the largest developing country in the world, my country currently ranks third in energy production and second in basic energy consumpti...

Claims

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Application Information

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IPC IPC(8): G05B19/418
CPCY02P90/02G05B19/41865
Inventor 刘吉臻张文广孙亚洲高明明杨婷婷房方曾德良邱天
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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