Self-adaptive coal quality adjustment system and method in RUNBACK (RB) process

Abstract

The invention discloses a self-adaptive coal quality adjustment system and method in the RB process. A first switching device receives logical signals output by an RB generation module and correction coefficients output by a heat value correction module, and outputs the logical signals and the correction coefficients to a first multiplier; the first multiplier multiplies values output by the first switching device by output of a practical coal amount module to obtain a corrected coal amount; a divider divides output of a set load module by the corrected coal amount to obtain a dynamic value, and transmits the dynamic value to a second switching device; the second switching device receives the logical signals output by the RB generation module and values output by the divider, and transmits the logical signals and the values to a second multiplier; the second multiplier multiplies output of the second switching device by output of a target load module when RB occurs and transmits the product to a third switching device; and the third switching device receives logical signals output by the RB generation module and output of a coal amount instruction module, and transmits the logical signals and the output to a fuel controller. Thus, self-adaptive coal quality adjustment can be realized.

Description

technical field [0001] The invention relates to a system and method for self-adaptive adjustment of coal quality in the process of auxiliary machine failure and load reduction. Background technique [0002] When the unit’s main auxiliary machine fault trips and the unit’s actual power is limited (the coordination control system is in the automatic state), in order to adapt to the output of the equipment, the coordination control system will forcefully reduce the load of the unit to the load target value that the auxiliary machines that are still in operation can bear . This function of the coordinated control system is called auxiliary machine failure load reduction (RUNBACK), referred to as RB. The purpose of RB function design is to automatically deal with faults and automatically reduce the load of the unit to the target corresponding to the allowable output of the current operating equipment, maintaining the unit’s The main parameters are within the allowable range, avo...

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Problems solved by technology

When RB occurs, the coal quality does not change, but due to the drastic load change and the complex change of unit working conditions, the calculation of the calorific value correction circuit is deviated, which is easy to change the calorific value correction value during the RB action process. At the same time, when RB occurs , the unit cuts and injects fuel, and quickly throws off part of the fuel volume, resulting in large fluctuations in the fuel volume, changes in the calorific value correction value and rapid changes in the fuel volume will cause the fuel sent to the fuel master control to not match the actual load. Occurs, resulting in unstable combustion conditions and lower quality of the combustion control system, leading to furnace fire extinguishing during the RB process and unit tripping

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