Balanced coal supply control device of large circulating fluidized bed boiler

Abstract

The invention discloses a balanced coal supply control device of a large circulating fluidized bed boiler. The balanced coal supply control device comprises a main coal supply regulation loop and a coal supplier multi-execution mechanism coordination loop, wherein the coal supplier multi-execution mechanism coordination loop comprises balanced coal supply regulation loops at the side A and the side B of the circulating fluidized bed boiler, and coal supply signals output by the main coal supply regulation loop are respectively sent to the balanced coal supply regulation loops at the side A and the side B. A total coal supply quantity setting control command of the main coal supply loop consists of the output of a boiler master, and a controlled quantity is the actual total coal supply quantity of all coal suppliers; after the total coal supply quantity setting control command and the controlled quantity are subjected to deviation calculation, the control quantity is worked out throughPI or PID regulation operation; and the output is respectively sent to the balanced coal supply regulation loops comprising multiple coal suppliers at the side A and the side B to balancedly control the coal supply of the side A and the side B of the large circulating fluidized bed so as to guarantee that the bed temperature of the left side and the right side of a hearth uniformly changes. The invention meets the combustion control requirement on a hearth with a large width / depth ratio.

Description

technical field [0001] The invention relates to a balanced coal feeding control device suitable for independent development of a large circulating fluidized bed boiler (CFB), so as to meet the combustion control requirements of a furnace with a large width-to-depth ratio. Background technique [0002] Circulating fluidized bed boiler (CFB) has developed rapidly in recent years due to its cleaner combustion mode, wide fuel adaptability, and wide load regulation ratio. The self-developed subcritical large-scale (evaporation capacity 1025t / h) CFB has been put into For commercial operation, my country's CFB has entered the development stage of subcritical parameters, and the self-developed large-scale CFB has become one of the preferred technologies for thermal power plants. [0003] The self-developed large-scale circulating fluidized bed boiler adopts a single furnace structure with a large width-to-depth ratio and multi-point coal supply. In this way, balanced coal supply is v...

AI Technical Summary

Problems solved by technology

The self-developed large-scale circulating fluidized bed boiler adopts a single furnace structure with a large width-to-depth ratio and multi-point coal supply. It is quite different from the imported CFB in terms of boiler process structure and control methods. The imported CFB industry The effective coal feeding control scheme cannot meet the control requirements of self-developed CFB

Therefore, for a long time, domestically produced CFB units have not been able to achieve a balanced control of coal feeding on both sides.

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