Evaluation method of boiler efficiency of thermal generator set under different loads

Abstract

The invention provides an evaluation method of a boiler efficiency of a thermal generator set under different loads. A source of a changing value of a mean efficiency value is identified by using a statistical test method and thus an objective of accurate evaluation of an implementation effect of an optimized program of boiler combustion is achieved. The method comprises the steps: step one, obtaining set performance data before implementation n1 groups of combustion optimization program and set performance data before implementation n2 groups of combustion optimization program; step two, obtaining a load (main steam flow)-boiler efficiency reference curve; step three, carrying out converting on the efficiency values obtained by the step one based on the reference curve obtained in the step two; step four, determining whether the boiler efficiency is changed obviously before and after the combustion optimization program implementation by using a t test method; and step five, comparing the two groups of converted mean efficiency values before and after the combustion optimization program implementation on the premise of obvious changes, determined by the step four, of the boiler efficiency before and after the combustion optimization program implementation.

Description

technical field [0001] The invention belongs to the technical field of thermal power generation, and in particular relates to a method for evaluating boiler efficiency under different loads of a thermal power generating set. Background technique [0002] Boiler combustion optimization project is a common means of improving economy in thermal power plants, and its project accounting method is mainly to measure the improvement of boiler efficiency. However, the boiler efficiency value is greatly affected by the load of the unit, and the boiler efficiency under different loads is not comparable. Usually, the comparative calculation of boiler efficiency is mainly based on the performance test under multiple fixed loads. However, since the load of the unit often fluctuates approximately randomly with factors such as the combustion state and production power demand, the complete fixed load state can It is impossible to exist without affecting production. In addition, traditional...

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Problems solved by technology

However, the boiler efficiency value is greatly affected by the load of the unit, and the boiler efficiency under different loads is not comparable

Usually, the comparative calculation of boiler efficiency is mainly based on the performance test under multiple fixed loads. However, since the load of the unit often fluctuates approximately randomly with factors such as the combustion state and production power demand, the complete fixed load state can It is impossible to exist without affecting the production

In addition, the traditional performance test comparison method often uses the method of comparing the average value within a period, which belongs to the category of sampling statistics. When the sample size is too small, it is difficult for the sample to accurately reflect the overall characteristics.

Although the traditional forced fixed load performance test has high accuracy, it consumes a lot of manpower and material resources, which affects the normal production of the unit, which makes it impossible to guarantee the appropriate sampling sample size for the number of forced fixed load tests

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