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Method for controlling load of biomass vibration grate boiler

A technology of boiler load and vibrating grate, which is applied in the control of combustion, lighting and heating equipment, etc., can solve the problems of unstable boiler fuel properties, difficulty in maintaining stable boiler load, and difficulty in automatic control of unit stable operation load.

Inactive Publication Date: 2010-06-09
CHINA ELECTRIC POWER RES INST +1
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Problems solved by technology

[0005] At present, most power plants are generally not equipped with biomass fuel pretreatment equipment, so if the weather is bad or the moisture content of the fuel itself is relatively high, the nature of the fuel put into the boiler is very unstable, and the load of the boiler is difficult to maintain stable
Moreover, power plants are generally not equipped with equipment for online measurement of fuel moisture content or calorific value. The load fluctuation caused by the change of fuel calorific value cannot be predicted and has strong randomness. control poses great difficulties

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  • Method for controlling load of biomass vibration grate boiler
  • Method for controlling load of biomass vibration grate boiler
  • Method for controlling load of biomass vibration grate boiler

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Embodiment Construction

[0045] Based on the above model analysis of boiler load and furnace temperature, we found that due to the strong randomness of changes in the moisture and calorific value of biomass fuel, the fluctuation of boiler load is unpredictable and difficult to control accurately. Therefore, consider Introduce fuzzy control scheme to solve it.

[0046] It can be seen from the model analysis that to overcome the fluctuation of boiler load, it is mainly to effectively control the heat input into the boiler. When the load and furnace temperature drop, on the one hand, it is necessary to increase the temperature of each air as much as possible, and on the other hand, it is necessary to increase the amount of boiler fuel B r , keep the grate real-time fuel volume B g , to increase the fuel reaction rate coefficient k B . The way to maintain the real-time fuel volume is to maintain the dynamic balance between the feed volume and the slag discharge volume, which can be accomplished through...

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Abstract

The invention carries out intensive model analytical research on influence of biomass fuel characteristic changes on boiler load, analyzes the principle that the load fluctuates along with changes of moisture and calorific values of the fuel, provides a measure for stabilizing the boiler load to ensure stable fuel supply quantity, properly increases total air quantity and grate air quantity, increases grate vibration frequency, air temperature and the like, and carries out fuzzy control on the total air quantity and the grate air quantity by using a fuzzy control principle so as to achieve the aim of quickly regulating the temperature of the hearth and stabilizing the boiler load.

Description

technical field [0001] The invention belongs to the field of thermal control, and in particular relates to a load control method of a biomass vibrating grate boiler. Background technique [0002] In recent years, my country's biomass direct combustion power generation technology has developed rapidly, mainly introducing water-cooled vibrating grate technology and equipment, and more than a dozen power plants have been put into operation for power generation. However, the properties of biomass fuels such as straws change greatly with changes in weather and environmental temperature and humidity, and the most important change is the change in the calorific value of the fuel. During the actual operation of the power plant, the moisture content of the purchased fuel also changes within a wide range. Table 1 is the statistics of fuel moisture and calorific value of a straw power generation project. From the table, it can be seen that the calorific value of fuel basically decreas...

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Application Information

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IPC IPC(8): F23N5/00
Inventor 王乐王志凯
Owner CHINA ELECTRIC POWER RES INST
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