Layered calorific value correction mode based different-coal quantity control method

Abstract

The invention relates to a layered calorific value correction mode based different-coal quantity control method. The method includes the steps of 1), establishing a layered calorific value correction mode through a coal calorific value of each coal bed; 2), through setting of the layered calorific values, a control system acquiring calorific value data information of the different coal beds, accurately controlling secondary wind under different coals, optimizing combustion favorably and improving safe and economical operation of a machine set; 3), through setting of the layered calorific values, the control system acquiring the calorific data information of the different coal beds to realize that different coal quantity changes among the different coal beds in varying load, adding more coals to coal mill groups with combustion of high-calorific value coals when adding the load, and reducing the coals from the coal mill groups with combustion of the high-calorific value coals to reduce fluctuation of low-calorific value coals when reducing the load. Compared with the prior art, the different-coal quantity control method has the advantage of stability in boiler combustion.

Description

technical field [0001] The invention relates to the operation and control technology of a coal-fired unit, in particular to a method for controlling the amount of coal burned by different types of coal based on a layered calorific value correction mode. Background technique [0002] For coal-fired boilers, it is usually designed according to a specific coal type and equipped with a certain type of check coal. However, due to the changeable coal price, power plants often mix other coals with different calorific values ​​in consideration of the cost of unit operation. This phenomenon is particularly prominent in recent years, and the proportion of mixed combustion is getting higher and higher. [0003] The calorific value correction originally designed by the unit is suitable for the working conditions of a single coal type or a small amount of blended combustion. When the unit is blended with different coal types and the calorific value difference between different coal types...

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Problems solved by technology

[0003] The calorific value correction originally designed by the unit is suitable for the working condition of a single coal type or a small amount of blended combustion. When the unit is blended with different coal types and the calorific value difference between different coal types is large, the original calorific value automatic correction circuit cannot be well To realize the correction of calorific value deviation from the design value, the operator modifies a total calorific value correction coefficient, the meaning is not clear, and some functions that are beneficial to the economical operation of the unit under the mixed firing condition cannot be realized

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