Method for monitoring and protecting combustion of gas turbine by adopting air exhaust temperature dispersity

Abstract

The invention discloses a method for monitoring and protecting the combustion of gas turbine by adopting gas exhaust temperature dispersity, and relates to a protecting method for preventing a gas turbine from being damaged for combustion instability during the running process after being in an active service. The method comprises the following steps of: installing a plurality of temperature measuring thermocouples at the turbine air exhaust end of the gas turbine, and acquiring a gas exhaust temperature dispersity through temperature measuring thermocouple collecting signals by adopting a multi-dimensional space cosine law, thereby predicting the combustion stability of a combustion chamber indirectly; establishing the alarm logic and alarm exit logic of combustion monitoring and protection of the gas turbine according to the gas exhaust temperature dispersity; and establishing the dangerous tripping logic of combustion monitoring and protection of the gas turbine. Compared with the traditional method, the method for monitoring and protecting the combustion of gas turbine by adopting gas exhaust temperature dispersity provided by the invention is simple in design, is easy to expand, cannot increase the work load additionally because of the variation of the number of temperature measurement thermocouples, is also simple and convenient in calculation, and is high in real-time performance; and meanwhile the algorithm is high in anti-interference capability, and can effectively lower the influences to monitoring and protection effectiveness by working condition variation of noises and the gas turbine effectively.

Description

technical field [0001] The invention relates to a protection method for preventing combustion instability during operation of a gas turbine after service, in particular to the design of turbine exhaust dispersion and a signal processing method for preventing combustion instability, belonging to the technical field of real-time monitoring of gas turbine combustion stability . Background technique [0002] With the development of modern gas turbine technology and the demand for efficiency improvement, the temperature before the turbine of heavy-duty gas turbines is getting higher and higher. Taking GE's heavy-duty gas turbines as an example, the current temperature before the turbine of E / F heavy-duty gas turbines is as high as 1300° C, the temperature before the turbine of the next generation G / H heavy-duty gas turbine is as high as 1450°C. At such a high temperature, some failures such as rupture and damage will inevitably occur in the long-term operation of the hot-end com...

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the traditional gas turbine combustion monitoring and protection method is too complicated. By using the data-driven method based on the cosine theorem, a method of characterizing the degree of dispersion by using the deviation angle is realized, thereby improving the real-time performance of the gas turbine combustion monitoring and protection system. sex and accuracy

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