Control method of primary air fan of circulating fluidized bed boiler

A technology of circulating fluidized bed and control method, applied in the field of linkage control of primary fan frequency converter + outlet baffle

Inactive Publication Date: 2012-09-19
TAIYUAN UNIV OF TECH
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

And the primary fan is not suitable to only adopt the variable speed adjustment method, because as the speed decreases, the primary air volume decreases with the power of the speed, and the total pressure decreases with the quadratic power of the speed. The total pressure of the primary fan drops sharply, which cannot be guaranteed. Therefore, it is not feasible to only use the variable speed adjustment method for the primary fan of the circulating fluidized bed boiler, and it is not economical to only use the inlet baffle adjustment

Method used

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  • Control method of primary air fan of circulating fluidized bed boiler
  • Control method of primary air fan of circulating fluidized bed boiler
  • Control method of primary air fan of circulating fluidized bed boiler

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Experimental program
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Embodiment

[0029] (1) According to figure 2 , image 3 The indicated bed pressure drop △p l and primary air volume Q 1 The operating characteristics of the bed pressure drop determined by the boiler load rate R and primary air volume .

[0030] (2) Bed pressure drop and primary fan outlet baffle opening and primary air volume Related, can be described as: (1)

[0031] In formula (1), is the bed pressure drop resistance characteristic coefficient, which is determined by the design flow point; It is the resistance coefficient related to the opening of the primary fan outlet baffle, which is a correlation and determined by the resistance characteristic test of the baffle opening. bed pressure drop , primary air volume and coefficient is known, the corresponding baffle opening can be determined by formula (1) .

[0032] (3) Total pressure of primary fan It can be obtained by calculating the resistance of the flue gas system:

[0033] ...

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Abstract

The invention relates to a control method of a primary air fan of a circulating fluidized bed boiler, which is a linked control method with adoption of a frequency converter and an outlet baffle. The method comprises the steps of: arranging the openness of an outlet baffle of the primary air fan and a rotary speed online calculation module according to pressure drop of the bed of the circulating fluidized bed boiler and operational characteristics of primary air quantity; providing the openness of the outlet baffle of the primary air fan and a rotary speed given value of the air fan under different furnace loads in real time; and adjusting the outlet baffle and the frequency converter respectively by a PI (proportional plus integral) controller to realize linked control of the frequency converter and the outlet baffle of the primary air fan so as to meet the operational requirement of the circulating fluidized bed boiler, thereby further reducing the energy consumption.

Description

Technical field [0001] The present invention involves a circulating fluidized bed boiler a fan inverter+export baffle linkage control method.In particular, it is a linked control method based on a fan -based fan -based fan -based fan+export baffle with a air volume operation characteristics. Background technique [0002] Circular fluidization bed combustion technology is one of the clean coal combustion technology. It is to add coal and desulfurization to the bed layer of the combustion chamber, and make the bed layer suspended from the bottom of the furnace.Sulfur, low volatile scores (such as coal vermiculite) such as inferior fuels that are difficult to adapt to conventional coal flove furnaces such as low -cost desulfurization and low NO in the furnace X The advantages of emissions.The circulating fluidization bed boiler has developed rapidly and the capacity is becoming increasingly large. It plays an extremely important role in changing China's power structure and the use ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23C10/18
Inventor 马素霞李红格宋建成崔志刚
Owner TAIYUAN UNIV OF TECH
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