Temperature-adjustable and resistance-adjustable fluidized wind system of circulating fluidized bed boiler

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

Active Publication Date: 2014-03-19
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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  • Temperature-adjustable and resistance-adjustable fluidized wind system of circulating fluidized bed boiler
  • Temperature-adjustable and resistance-adjustable fluidized wind system of circulating fluidized bed boiler
  • Temperature-adjustable and resistance-adjustable fluidized wind system of circulating fluidized bed boiler

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Experimental program
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Effect test

Embodiment 1

[0047] figure 1 Shown is a 300MW circulating fluidized bed 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. To implement SO 2 The emission concentration is lower than 200mg / m 3 , the calcium-sulfur molar ratio was as high as 4.5 during operation. The temperature of the primary hot air is reduced to 170°C through the primary hot air heat exchanger C, the resistance of the corresponding air distribution plate is reduced to 5.2kPa, the temperature of the dense phase area is reduced to 920°C, and the current of the primary fan is reduced to 45A. Under the same operating conditions, calcium sulfur SO can be realized under the condition of molar ratio as high as 2.8 2 The emission concentration is lower than 200mg / m 3 , the effect of energy saving and emission reduction is remarkable.

[0048] In this application exam...

Embodiment 2

[0052] figure 1 Shown is a 200MW circulating fluidized bed boiler. The boiler is equipped with a start-up burner. When operating at 50% load in winter, the primary hot air temperature is 150°C, the resistance of the air distribution plate is only 1.6kPa, and the slag leakage of the air cap is serious. coking. 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 steam from the auxiliary steam header. After the primary hot air temperature increases, the resistance of the corresponding air distribution plate rises to 2kPa, the phenomenon of poor fluidization and slag leakage from the air cap disappears, and the operating safety of the unit is improved.

Embodiment 3

[0054] figure 2 Shown is a 150MW circulating fluidized bed boiler. The boiler does not have a start-up burner, and can only be started by the oil gun on the bed, and the fuel consumption is high during the start-up process. During start-up, the temperature of the fluidizing 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 steam from the auxiliary steam header, and the start-up 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 temperature resistance dual adjustable fluidizing air system for circulating fluidized bed boilers. Background technique [0002] Circulating fluidized bed (CFB) boilers have the advantages of low pollutants and wide fuel adaptability, and have been rapidly developed in the world in the past 30 years. The main units of circulating fluidized bed boilers in my country are 135MW and 300MW, and the number and total installed capacity of circulating fluidized bed boilers put into operation rank first in the world. Due to the particularity of the coal used by China's circulating fluidized bed boilers and the harsh operating conditions, a considerable number of circulating fluidized bed boilers have problems such as low combustion efficiency, excessive pollutant emission concentrations, and high power consumption. [0003] Both the circulating fluidized bed ...

Claims

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Application Information

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Patent Type & Authority Applications(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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