Power station boiler abnormal working condition detection method and system

Abstract

The invention relates to a power station boiler abnormal working condition detection method and system, and relates to the technical field of boiler detection, and the method comprises the steps: obtaining the flue gas flow velocity at different positions on the same cross section; the cross section is the cross section of a target flue to be detected; the flue gas flow velocity is determined by a flow velocity detection component arranged on the target flue; calculating flue gas data of the calibrated flue through-flow area according to the calibrated flue gas flow velocity; the flue gas data comprises flue gas flow, an ash deposition risk value, a wind speed deviation value and a wear value; the cross section comprises a plurality of flue through-flow areas; judging whether the flue gas data of the calibrated flue through-flow area meet preset conditions or not; and if the flue gas data of the calibrated flue through-flow area does not meet the preset condition, it is determined that the working condition of the boiler where the target flue is located is abnormal. The detection precision of the abnormal working condition of the power station boiler is improved.

Description

technical field [0001] The invention relates to the technical field of boiler detection, in particular to a method and system for detecting abnormal working conditions of power plant boilers. Background technique [0002] At present, the rapid development of my country's new energy power generation industry has brought about the phenomenon of coal power overcapacity and promoted the flexibility transformation of coal power. It has become the norm for thermal power units, especially large coal-fired power units, to continue to operate at low load or deep peak regulation. Among them, the peak shaving process is the process of changing the thermal physical characteristics and thermal stress distribution inside the boiler. [0003] When designing power plant boilers, the flue flow area is designed based on a fixed amount of flue gas volume, but during the peak shaving period, the flue gas volume in the flue gas volume of the boiler unit deviates seriously from the design value....

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Problems solved by technology

[0003] When designing power plant boilers, the flue flow area is designed based on a fixed amount of flue gas volume, but during peak shaving, the flue gas volume in the flue gas duct of the boiler unit deviates seriously from the design value

And under the influence of flue dust accumulation, the flue gas flows unevenly on the upper and lower sides of the flue cross section; There is uneven distribution of flow velocity in both directions, which will also affect the unevenness of ash accumulation in the flue

Although there is a soot blower in the flue that can regularly purge the soot deposits, it is impossible for the soot blower to purge in real time, and the soot blower cannot eliminate the flue gas flow rate in the flue caused by the change of the flue gas volume under the variable operating conditions of the unit peak regulation. Inhomogeneous distribution over the flow cross-section

[0004] With the increasing capacity of coal-fired power units, the uneven distribution of the medium flow velocity in the boiler flue in the cross-section during the peak regulation process is becoming more and more serious, which may cause overheating of the boiler tube, excessive wear and tear, and even lead to Unplanned outages seriously threaten the safe operation of power plants

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