Circle-contacted coal fired boiler tube wall temperature global optimizing and debugging method

Abstract

The invention relates to a circle-contacted coal fired boiler tube wall temperature global optimizing and debugging method. The method comprises the following steps: (S1) the burnout air vertical swing angle distinguishing testing is performed under high, medium and low loads of an unit to obtain optimal burnout air vertical swing angle positions of the unit under different loads; (S2) based on the step (S1), the operation oxygen quantity testing is performed on common coal types to obtain optimal operation oxygen quantity control values of the unit under different loads; and (S3) the coal mill combination testing is performed on the common coal types to obtain a coal mill combined operation mode with optimal tube wall temperature control. The method solves the problems of high CO contentin smoke of the unit under high load and insufficient reheated steam temperature caused by reheated steam tube wall overheating under each load, can effectively control the superheating pipe blastingproblem, and provides references to optimal adjustment of the tube wall temperature of the unit with the same type.

Description

technical field [0001] The invention relates to the field of boiler debugging, in particular to an overall optimization debugging method for the tube wall temperature of a tangential coal-fired boiler. Background technique [0002] With the gradual increase of the parameters of the unit, the overheating of the tube wall and the high temperature corrosion in the furnace of the unit under medium and high loads are particularly prominent, which has also attracted widespread attention. The research on the material analysis of the tube explosion on the heating surface shows that in addition to the properties of the tube itself and the welding process, the overheating of the tube wall is also an important cause of the tube explosion. Therefore, it is particularly important to strengthen the monitoring of tube wall temperature. Several major boiler factories have adopted the method of adding online temperature measuring points to fully grasp the wall temperature distribution and ov...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for overall optimization and debugging of the tube wall temperature of a tangential coal-fired boiler, to solve the problem of high CO content in the flue gas under high load in the prior art and easy occurrence of reheated steam tube wall overheating under various loads to cause reheating. The problem of insufficient hot steam temperature fills the gap in the current optimal adjustment method for the tube wall temperature of this type of unit

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