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A temperature-resistance double-adjustable fluidizing air system for a circulating fluidized bed boiler

A circulating fluidized bed and air system technology, which is applied to fluidized bed combustion equipment, fuel burning in a molten state, lighting and heating equipment, etc. problems such as large impact, to achieve the effect of shortening start-up time, saving fuel, and ensuring stable operation

Active Publication Date: 2016-01-13
HUANENG CLEAN ENERGY RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the actual operation process, the resistance of the air distribution plate and the air cap of some power plants can even reach 7kPa under high load, and the current of the primary fan remains high, which seriously affects the operating economy of the unit
[0006] The traditional operation method can only adjust the resistance of the air distribution plate and the hood by changing the primary air volume, the adjustment range is small, the method is single, and it is greatly affected by the operation of the unit

Method used

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  • A temperature-resistance double-adjustable fluidizing air system for a circulating fluidized bed boiler
  • A temperature-resistance double-adjustable fluidizing air system for a circulating fluidized bed boiler
  • A temperature-resistance double-adjustable fluidizing air system for a circulating fluidized bed boiler

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] figure 1 Shown is a 300MW CFB boiler. When the load is above 75%, the primary air rate is 60%, the corresponding bed temperature is 960°C, the primary hot air temperature is 230°C, and the resistance of the air distribution plate is 6.8kPa. for SO 2 The emission concentration is less than 200mg / m 3 , the calcium-sulfur molar ratio during operation was as high as 4.5. Through the primary hot air heat exchanger C, the primary hot air temperature is reduced to 170°C, the corresponding air distribution plate resistance is lowered to 5.2kPa, the temperature of the dense phase zone is lowered to 920°C, and the primary fan current is lowered by 45A. Under the same operating conditions, calcium sulfur SO can be achieved with a molar ratio as high as 2.8 2 The emission concentration is less than 200mg / m 3 , the effect of energy saving and emission reduction is remarkable.

[0048] In this application example, the air is pressurized and transported by the primary fan 13 to ...

Embodiment 2

[0052] figure 1 Shown is a 200MW CFB boiler. The boiler is equipped with a start-up burner. When running at 50% load in winter, the primary hot air temperature is 150°C, the resistance of the air distribution plate is only 1.6kPa, the air cap has serious slag leakage, the front and rear wall areas of the air distribution plate are poorly fluidized, and the bed surface appears many times. coke. The temperature of the primary hot air is raised to 200°C through the primary hot air heat exchanger C, and the heat exchange medium in the primary hot air heat exchanger C is the steam from the auxiliary steam header. After the temperature of the primary hot air increases, the resistance of the corresponding air distribution plate rises to 2kPa, the poor fluidization and the slag leakage of the air cap disappear, and the operation safety of the unit is improved.

Embodiment 3

[0054] figure 2 Shown is a 150MW CFB boiler. The boiler does not have a start-up burner, and can only be started through the bed oil gun, and the fuel consumption during the start-up process is high. During startup, the temperature of the fluidized air is increased from 50°C to 150°C by starting the primary hot air heat exchanger C. The heat exchange medium in the primary hot air heat exchanger C is the steam from the auxiliary steam header, and the startup time is shortened by about 2 hours. Significant savings in starting oil.

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Abstract

The invention relates to a temperature-adjustable and resistance-adjustable fluidized wind system of a circulating fluidized bed boiler. The system comprises a primary cold wind volume adjusting device, a primary hot wind heat exchanger, a primary hot wind volume adjusting device and a wind chamber; the fluidized wind temperature required by the combustion can be adjusted according to the operation needs, when the bed temperature is high, the bed temperature can be reduced by reducing the primary hot wind temperature, and thus the increase of the discharge amount of SO2 and NOx can be avoided; when the bed temperature is low, the bed temperature can be increased by increasing the primary hot wind temperature; when the system is under a high work load or operates in summer, the electricity consumption of the draught fan and the wear of the cap can be reduced by reducing the primary hot wind temperature; when the system is under a medium or low work load or operates in winter, the resistance of the air distributor can be increased by increasing the primary hot wind temperature so as to avoid the problems of bad fluidization and slag leakage. The system overcomes the shortages that in the conventional methods bed temperature is adjusted through modulating the ratio of a primary wind volume to a secondary wind volume, achieves the dynamic wind distributor resistance adjustment, and is widely used as an assisting device for newly-built boilers or is applied to the old boiler reconstruction.

Description

technical field [0001] The invention relates to the technical field of circulating fluidized bed boilers, in particular to a fluidized air system with double adjustable temperature resistance for circulating fluidized bed boilers. Background technique [0002] Circulating fluidized bed (circulating fluidized bed, CFB) boilers have the advantages of low pollutants and wide fuel adaptability, and have been rapidly developed around the world in the past three decades. The main units of circulating fluidized bed boilers in my country are 135MW and 300MW grades, and the number and total installed capacity of circulating fluidized bed boilers in operation rank first in the world. Due to the particularity of the coal used in China's CFB boilers and the harsh operating conditions, a considerable number of CFB boilers have problems such as low combustion efficiency, excessive pollutant emission concentrations, and high power consumption. [0003] The circulating fluidized bed boiler...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23C10/20F23C10/18F23C10/28
Inventor 黄中江建忠徐正泉肖平孙献斌
Owner HUANENG CLEAN ENERGY RES INST
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