JP2006274837A - Method of correcting efficiency of coal-fired power generation plant and its system - Google Patents
Method of correcting efficiency of coal-fired power generation plant and its system Download PDFInfo
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本発明は、石炭火力発電プラントの発電効率を補正するプラント効率補正方法及びそのシステムに関する。 The present invention relates to a plant efficiency correction method and system for correcting power generation efficiency of a coal-fired power plant.
火力発電所において効率良く火力発電プラントを運転させるためには、火力発電プラントの発電効率を正確に把握しておくことが必要である。この発電効率は、石炭・重油・軽油等の燃料の供給量と、燃料毎の単位発熱量から１日当たりの火力発電プラントへの供給熱量を算出し、１日当たりの供給熱量と発電電力量との比から求めることができる。
石炭火力発電プラントにおいては、石炭の単位発熱量が炭種によって異なると共に、日々変動する石炭に含まれる水分割合によっても異なるから、石炭粉末の水分吸着率と石炭の灰分率をそれぞれ測定して石炭の単位発熱量を求めている（例えば、特許文献１参照）。
In order to operate a thermal power plant efficiently in a thermal power plant, it is necessary to accurately grasp the power generation efficiency of the thermal power plant. The power generation efficiency is calculated by calculating the amount of heat supplied to the thermal power plant per day from the amount of fuel supplied, such as coal, heavy oil, and light oil, and the unit calorific value of each fuel, and the amount of heat supplied per day and the amount of power generated It can be obtained from the ratio.
In coal-fired power plants, the unit calorific value of coal varies depending on the type of coal, and also varies depending on the moisture content contained in the coal, which varies from day to day. Therefore, the moisture adsorption rate of coal powder and the ash content rate of coal are measured respectively. Is calculated (for example, refer to Patent Document 1).
従来、石炭火力発電プラントの発電効率の計算には、炭種毎に既定の単位発熱量を使用していた。しかし、石炭火力発電プラントでは、数種類の石炭を混ぜ合わせて使用しているために、石炭火力発電プラントに供給する石炭の成分にばらつきがあり、計算で求めた供給熱量と実際の供給熱量との間に誤差が生じて正確な発電効率を得ることができないという課題があった。
そこで、本発明は、石炭火力発電プラントの正確な発電効率を計算することができ、石炭火力発電プラントの最適な運用管理を行うことができる石炭火力発電プラント効率補正方法及びそのシステムを提供するものである。
Conventionally, in calculating the power generation efficiency of a coal-fired power plant, a predetermined unit calorific value was used for each coal type. However, since coal-fired power plants use a mixture of several types of coal, the components of coal supplied to the coal-fired power plant vary, and the calculated heat supply and actual heat supply There was a problem that an error occurred between them and accurate power generation efficiency could not be obtained.
Accordingly, the present invention provides a coal-fired power plant efficiency correction method and system capable of calculating the exact power-generation efficiency of the coal-fired power plant and performing optimum operation management of the coal-fired power plant. It is.
本発明は、上記課題を解決するために、石炭の供給量と既定の単位発熱量から石炭火力発電プラントへの供給熱量を算出すると共に、前記石炭火力発電プラントの発電電力量を計測し、前記供給熱量と前記発電電力量の比から石炭火力発電プラントの発電効率を計算する石炭火力発電プラント効率計算方法において、前記石炭火力発電プラントに供給する一定期間の石炭の平均成分を分析する石炭成分分析手段と、この分析した平均成分から前記石炭の単位発熱量を補正する単位発熱量補正手段を有する石炭火力発電プラント効率補正方法を提供するものである。 In order to solve the above problem, the present invention calculates the amount of heat supplied to a coal-fired power plant from the amount of coal supplied and a predetermined unit calorific value, and measures the amount of power generated by the coal-fired power plant, In the coal thermal power plant efficiency calculation method for calculating the power generation efficiency of the coal thermal power plant from the ratio of the supplied heat amount and the generated power amount, a coal component analysis for analyzing an average component of coal supplied to the coal thermal power plant for a certain period And a method for correcting the efficiency of a coal-fired power plant having unit calorific value correction means for correcting the unit calorific value of the coal from the analyzed average component.
また、本発明は、前記石炭火力発電プラントに供給する石炭に含まれる水分割合を測定する水分割合測定手段と、この水分割合に基づいて前記石炭火力発電プラントへの供給熱量を補正する供給熱量補正手段を有する請求項１に記載の石炭火力発電プラント効率補正方法を提供するものである。
The present invention also provides a moisture ratio measuring means for measuring a moisture ratio contained in the coal supplied to the coal-fired power plant, and a supply heat amount correction for correcting the supply heat amount to the coal-fired power plant based on the moisture ratio. The coal-fired power plant efficiency correction method according to
また、本発明は、前記石炭火力発電プラントを一定の条件で運転して発電効率を測定し、この発電効率に基づいて石炭火力発電プラントの性能診断を行う性能診断手段を備えた請求項１又は２に記載の石炭火力発電プラント効率補正方法を提供するものである。 The present invention further comprises performance diagnosis means for operating the coal-fired power plant under a certain condition to measure power generation efficiency and performing performance diagnosis of the coal-fired power plant based on the power generation efficiency. A method for correcting the efficiency of a coal-fired power plant as described in 2 is provided.
また、本発明は、石炭の供給量と既定の単位発熱量から石炭火力発電プラントへの供給熱量を算出する供給熱量算出手段と、前記石炭火力発電プラントの発電電力量を計測する発電電力量計測手段と、前記供給熱量と前記発電電力量の比から石炭火力発電プラントの発電効率を計算する石炭火力発電プラント効率計算手段と、前記石炭火力発電プラントに供給する一定期間の石炭の平均成分を分析する石炭成分分析手段と、この分析した平均成分から前記石炭の単位発熱量を補正して前記石炭火力発電プラントの発電効率を補正する単位発熱量補正手段とからなる石炭火力発電プラント効率補正システムを提供するものである。 The present invention also provides a supply heat amount calculation means for calculating a supply heat amount to a coal thermal power plant from a coal supply amount and a predetermined unit calorific value, and a generated power amount measurement for measuring the generated power amount of the coal thermal power plant. Means, a coal-fired power plant efficiency calculating means for calculating the power generation efficiency of the coal-fired power plant from the ratio of the supplied heat amount and the generated power amount, and analyzing an average component of the coal supplied to the coal-fired power plant for a certain period A coal-fired power plant efficiency correction system comprising: a coal component analysis unit that corrects the power generation efficiency of the coal-fired power plant by correcting the unit calorific value of the coal from the analyzed average component It is to provide.
また、本発明は、前記石炭火力発電プラントに供給する石炭に含まれる水分割合を測定する水分割合測定手段と、この水分割合に基づいて前記石炭火力発電プラントへの供給熱量を補正する供給熱量補正手段を有する請求項４に記載の石炭火力発電プラント効率補正システムを提供するものである。 The present invention also provides a moisture ratio measuring means for measuring a moisture ratio contained in the coal supplied to the coal-fired power plant, and a supply heat amount correction for correcting the supply heat amount to the coal-fired power plant based on the moisture ratio. The coal-fired power plant efficiency correction system according to claim 4 having means.
また、本発明は、前記石炭火力発電プラントを一定の条件で運転して発電効率を測定し、この発電効率に基づいて石炭火力発電プラントの性能診断を行う性能診断手段を備えた請求項４又は５に記載の石炭火力発電プラント効率補正システムを提供するものである。 The present invention further comprises performance diagnosis means for operating the coal-fired power plant under a certain condition to measure power generation efficiency and performing performance diagnosis of the coal-fired power plant based on the power generation efficiency. The coal-fired power plant efficiency correction system according to 5, is provided.
また、本発明は、計算した発電効率を自動的に記憶する記憶手段を備えた請求項４乃至６の何れかに記載の石炭火力発電プラント効率補正システムを提供するものである。 Moreover, this invention provides the coal-fired power plant efficiency correction system in any one of Claims 4 thru | or 6 provided with the memory | storage means which memorize | stores automatically calculated power generation efficiency.
また、本発明は、前記記憶手段に記憶された発電効率の推移傾向から前記石炭火力発電プラントの不具合を予測する不具合予測手段を備えた請求項７に記載の石炭火力発電プラント効率補正システムを提供するものである。
The present invention also provides a coal-fired power plant efficiency correction system according to
本発明に係る石炭火力発電プラント効率補正方法によれば、石炭の供給量と既定の単位発熱量から石炭火力発電プラントへの供給熱量を算出すると共に、前記石炭火力発電プラントの発電電力量を計測し、前記供給熱量と前記発電電力量の比から石炭火力発電プラントの発電効率を計算する石炭火力発電プラント効率計算方法において、前記石炭火力発電プラントに供給する一定期間の石炭の平均成分を分析する石炭成分分析手段と、この分析した平均成分から前記石炭の単位発熱量を補正する単位発熱量補正手段を有する構成により、一定期間に石炭火力発電プラントに供給した石炭の平均成分から、その一定期間内の石炭の単位発熱量を補正して石炭火力発電プラントへの正確な供給熱量を算出することができ、石炭火力発電プラントの正確な発電効率を計算することができる。また、石炭火力発電プラントの発電効率に基づいて石炭火力発電プラントの最適な運用管理を行うことができる効果がある。 According to the coal thermal power plant efficiency correction method according to the present invention, the supply heat amount to the coal thermal power plant is calculated from the coal supply amount and the predetermined unit calorific value, and the generated power amount of the coal thermal power plant is measured. Then, in the coal thermal power plant efficiency calculation method for calculating the power generation efficiency of the coal thermal power plant from the ratio of the supplied heat amount and the generated power amount, an average component of coal supplied to the coal thermal power plant is analyzed. From the average component of the coal supplied to the coal-fired power plant in a certain period of time, the composition comprising the coal component analysis means and the unit calorific value correction means for correcting the unit calorific value of the coal from the analyzed average component By correcting the unit calorific value of coal in the coal, it is possible to calculate the exact amount of heat supplied to the coal-fired power plant. It can be calculated precise power generation efficiency. Moreover, there exists an effect which can perform optimal operation management of a coal thermal power plant based on the power generation efficiency of a coal thermal power plant.
また、本発明は、前記石炭火力発電プラントに供給する石炭に含まれる水分割合を測定する水分割合測定手段と、この水分割合に基づいて前記石炭火力発電プラントへの供給熱量を補正する供給熱量補正手段を有する請求項１に記載の構成により、石炭に含まれる水分割合よって変化する石炭火力発電プラントへの供給熱量を補正して、石炭火力発電プラントの発電効率から水分割合の変化による誤差を取り除くことができる効果がある。 The present invention also provides a moisture ratio measuring means for measuring a moisture ratio contained in the coal supplied to the coal-fired power plant, and a supply heat amount correction for correcting the supply heat amount to the coal-fired power plant based on the moisture ratio. According to the first aspect of the present invention, the amount of heat supplied to the coal-fired power plant that varies depending on the moisture ratio contained in the coal is corrected, and the error due to the change in the moisture ratio is removed from the power generation efficiency of the coal-fired power plant. There is an effect that can.
また、本発明は、前記石炭火力発電プラントを一定の条件で運転して発電効率を測定し、この発電効率に基づいて石炭火力発電プラントの性能診断を行う性能診断手段を備えた請求項１又は２に記載の構成により、石炭火力発電プラントの運転条件や誤差による発電効率の変動を抑制することができ、石炭火力発電プラントの不具合の兆候である発電効率の小さな変動を捉えて石炭火力発電プラントの性能診断を行うことができる効果がある。 The present invention further comprises performance diagnosis means for operating the coal-fired power plant under a certain condition to measure power generation efficiency and performing performance diagnosis of the coal-fired power plant based on the power generation efficiency. With the configuration described in 2, it is possible to suppress fluctuations in power generation efficiency due to operating conditions and errors of the coal-fired power plant, and capture small fluctuations in power generation efficiency that are signs of malfunctions in the coal-fired power plant. There is an effect that the performance diagnosis can be performed.
また、本発明に係る石炭火力発電プラント効率補正システムによれば、石炭の供給量と既定の単位発熱量から石炭火力発電プラントへの供給熱量を算出する供給熱量算出手段と、前記石炭火力発電プラントの発電電力量を計測する発電電力量計測手段と、前記供給熱量と前記発電電力量の比から石炭火力発電プラントの発電効率を計算する石炭火力発電プラント効率計算手段と、前記石炭火力発電プラントに供給する一定期間の石炭の平均成分を分析する石炭成分分析手段と、この分析した平均成分から前記石炭の単位発熱量を補正して前記石炭火力発電プラントの発電効率を補正する単位発熱量補正手段とからなる構成を有することにより、一定期間に石炭火力発電プラントに供給した石炭の平均成分から、その一定期間内の石炭の単位発熱量を補正して石炭火力発電プラントへの正確な供給熱量を算出することができ、石炭火力発電プラントの正確な発電効率を計算することができる。また、石炭火力発電プラントの発電効率に基づいて石炭火力発電プラントの最適な運用管理を行うことができる効果がある。 In addition, according to the coal-fired power plant efficiency correction system according to the present invention, the supply heat amount calculation means for calculating the supply heat amount to the coal-fired power plant from the supply amount of coal and a predetermined unit calorific value, and the coal-fired power plant Power generation power measuring means for measuring the amount of generated power of coal, coal-fired power plant efficiency calculation means for calculating the power generation efficiency of the coal-fired power plant from the ratio of the supplied heat amount and the power generation power, and the coal-fired power plant Coal component analysis means for analyzing the average component of coal supplied for a certain period, and unit heat value correction means for correcting the power generation efficiency of the coal-fired power plant by correcting the unit heat value of the coal from the analyzed average component From the average component of the coal supplied to the coal-fired power plant during a certain period, the unit emission of coal within the certain period is The amount was able to calculate the exact amount of heat supplied to the coal-fired power plant correction, it is possible to calculate the exact power generation efficiency of coal-fired power plants. Moreover, there exists an effect which can perform optimal operation management of a coal thermal power plant based on the power generation efficiency of a coal thermal power plant.
また、本発明は、前記石炭火力発電プラントに供給する石炭に含まれる水分割合を測定する水分割合測定手段と、この水分割合に基づいて前記石炭火力発電プラントへの供給熱量を補正する供給熱量補正手段を有する請求項４に記載の構成により、石炭に含まれる水分割合よって変化する石炭火力発電プラントへの供給熱量を補正して、石炭火力発電プラントの発電効率から水分割合の変化による誤差を取り除くことができる効果がある。 The present invention also provides a moisture ratio measuring means for measuring a moisture ratio contained in the coal supplied to the coal-fired power plant, and a supply heat amount correction for correcting the supply heat amount to the coal-fired power plant based on the moisture ratio. The structure according to claim 4, comprising means, corrects the amount of heat supplied to the coal-fired power plant that varies depending on the moisture ratio contained in the coal, and removes the error due to the change in the moisture ratio from the power generation efficiency of the coal-fired power plant. There is an effect that can.
また、本発明は、前記石炭火力発電プラントを一定の条件で運転して発電効率を測定し、この発電効率に基づいて石炭火力発電プラントの性能診断を行う性能診断手段を備えた請求項４又は５に記載の構成により、石炭火力発電プラントの運転条件や誤差による発電効率の変動を抑制することができ、石炭火力発電プラントの不具合の兆候である発電効率の小さな変動を捉えて石炭火力発電プラントの性能診断を行うことができる効果がある。 The present invention further comprises performance diagnosis means for operating the coal-fired power plant under a certain condition to measure power generation efficiency and performing performance diagnosis of the coal-fired power plant based on the power generation efficiency. With the configuration described in 5, it is possible to suppress fluctuations in power generation efficiency due to operating conditions and errors of the coal-fired power plant, and capture small fluctuations in power generation efficiency that are signs of malfunctions in the coal-fired power plant. There is an effect that the performance diagnosis can be performed.
また、本発明は、計算した発電効率を自動的に記憶する記憶手段を備えた請求項４乃至６の何れかに記載の構成により、計算した発電効率を記憶手段に蓄積することができ、蓄積された発電効率を統計管理することができる効果がある。 According to the present invention, the calculated power generation efficiency can be stored in the storage means by the configuration according to any one of claims 4 to 6 provided with a storage means for automatically storing the calculated power generation efficiency. It is possible to statistically manage the generated power generation efficiency.
また、本発明は、前記記憶手段に記憶された発電効率の推移傾向から前記石炭火力発電プラントの不具合を予測する不具合予測手段を備えた請求項７に記載の構成により、記憶された発電効率の推移傾向から将来の発電効率の変動を予測し、石炭火力発電プラントの不具合を予測することができる効果がある。 In addition, the present invention includes a failure prediction unit that predicts a failure of the coal-fired power plant from the trend of the generation efficiency stored in the storage unit. It has the effect of predicting future fluctuations in power generation efficiency from the trend, and predicting malfunctions in coal-fired power plants.
本発明の実施の形態を図示する実施例に基づいて説明する。
本発明に係る石炭火力発電プラント効率補正システムは、石炭の供給量と既定の単位発熱量から石炭火力発電プラントへの供給熱量を算出する供給熱量算出手段１と、前記石炭火力発電プラントの発電電力量を計測する発電電力量計測手段９と、前記供給熱量と前記発電電力量の比から石炭火力発電プラントの発電効率を計算する石炭火力発電プラント効率計算手段４と、前記石炭火力発電プラントに供給する一定期間の石炭の平均成分を分析する石炭成分分析手段７と、この分析した平均成分から前記石炭の単位発熱量を補正して前記石炭火力発電プラントの発電効率を補正する単位発熱量補正手段２とから構成してある。
Embodiments of the present invention will be described based on examples shown in the drawings.
The efficiency correction system for a coal-fired power plant according to the present invention includes a supply heat amount calculation means 1 for calculating the amount of heat supplied to the coal-fired power plant from the supplied amount of coal and a predetermined unit calorific value, and the generated power of the coal-fired power plant. The power generation amount measuring means 9 for measuring the amount, the coal-fired power plant efficiency calculation means 4 for calculating the power generation efficiency of the coal-fired power plant from the ratio of the supplied heat amount and the power generation amount, and the supply to the coal-fired power plant Coal component analysis means 7 for analyzing the average component of coal for a certain period of time, and unit calorific value correction means for correcting the power generation efficiency of the coal-fired power plant by correcting the unit calorific value of the coal from the analyzed
図１に示す実施例において、本発明に係る石炭火力発電プラント効率補正システムは、供給熱量算出手段１と単位発熱量補正手段２と供給熱量補正手段３と石炭火力発電プラント効率計算手段４と性能診断手段５を備えた計算機１０と、この計算機１０に接続して設けた記憶手段６と石炭成分分析手段７と水分割合測定手段８と発電電力量計測手段９とからなる。
In the embodiment shown in FIG. 1, the coal thermal power plant efficiency correction system according to the present invention includes a supply heat amount calculation means 1, a unit heat generation correction means 2, a supply heat amount correction means 3, a coal thermal power plant efficiency calculation means 4, and performance. It comprises a
供給熱量算出手段１は、石炭火力発電プラントに１日に供給する石炭の供給量と、この石炭の単位質量当たりの発熱量である単位発熱量から石炭火力発電プラントへの１日当たり供給熱量を算出することができるように構成してある。単位発熱量は、炭種別に水分を除いた乾炭の単位質量当たり発熱量を測定し、既定の単位発熱量として記憶手段６に記憶してある。
また、石炭の他に、重油や軽油等の燃料を石炭火力発電プラントに供給した場合には、これらの燃料の供給量と既定の単位発熱量から算出した供給熱量を、上記石炭による供給熱量に加えるようにしてある。
The supplied heat amount calculation means 1 calculates the daily supply heat amount to the coal-fired power plant from the supply amount of coal supplied to the coal-fired power plant and the calorific value per unit mass of the coal. It is configured to be able to. The unit calorific value is measured by measuring the calorific value per unit mass of dry coal excluding moisture for each charcoal type, and is stored in the storage means 6 as a predetermined unit calorific value.
In addition to coal, when fuel such as heavy oil or light oil is supplied to a coal-fired power plant, the supply heat amount calculated from the supply amount of these fuels and the predetermined unit calorific value is used as the supply heat amount by the coal. I am trying to add it.
図示の実施例において、石炭成分分析手段７は、石炭火力発電プラントに供給する石炭から毎日一定量ずつ採取し、採取した１０日分の石炭を混合して成分分析して一定期間の石炭の平均成分を分析することができるように構成してある。石炭を採取する回数や期間は実施例に限定されるものではなく、１日に複数回採取したり、１週間の平均成分を分析したりすることも勿論可能である。また、石炭を採取する毎に成分分析して１０日間の平均値を求めることも可能であるが、成分分析に手間とコストが掛かることから実施例のように１０日分の石炭を混合して成分分析することが好ましい。 In the illustrated embodiment, the coal component analysis means 7 collects a certain amount from the coal supplied to the coal-fired power plant every day, mixes the collected coal for 10 days, analyzes the components, and averages the coal over a certain period. It is configured so that the components can be analyzed. The number of times and the period for collecting coal are not limited to the examples, and it is of course possible to sample a plurality of times a day or to analyze the average component for one week. It is also possible to obtain an average value for 10 days by analyzing the components every time coal is collected. However, since it takes time and cost for the component analysis, the coal for 10 days is mixed as in the embodiment. It is preferable to analyze the components.
単位発熱量補正手段２は、石炭成分分析手段７において分析した平均成分から石炭の単位発熱量を計算し、記憶手段６に記憶した既定の単位発熱量を補正することができるように構成してある。この補正後の単位発熱量により石炭火力発電プラントへの供給熱量を再計算し、石炭火力発電プラントの発電効率を補正するようにしてある。一定期間の石炭の平均成分から単位発熱量を補正することにより、石炭のサンプリングのバラツキによる単位発熱量の誤差を抑制して正確な発電効率を求めることができる。 The unit calorific value correction means 2 is configured to calculate the unit calorific value of coal from the average component analyzed by the coal component analysis means 7 and to correct the predetermined unit calorific value stored in the storage means 6. is there. The amount of heat supplied to the coal-fired power plant is recalculated based on the corrected unit calorific value, and the power generation efficiency of the coal-fired power plant is corrected. By correcting the unit calorific value from the average component of coal for a certain period, it is possible to obtain an accurate power generation efficiency while suppressing an error in the unit calorific value due to variations in sampling of coal.
図示の実施例において、水分割合測定手段８は、石炭火力発電プラントに石炭を供給するベルトコンベヤに設置した石炭水分計からなり、石炭火力発電プラントに供給する石炭に含まれる水分割合を毎日測定することができるように構成してある。
また、供給熱量補正手段３は、水分割合測定手段８において測定した水分割合に基づいて、石炭の供給量から水分を除いた乾炭量を求め、この１日分の乾炭量と単位発熱量の積により補正した供給熱量を算出することができるようにしてある。
In the illustrated embodiment, the moisture percentage measuring means 8 comprises a coal moisture meter installed on a belt conveyor for supplying coal to the coal-fired power plant, and measures the moisture percentage contained in the coal supplied to the coal-fired power plant every day. It is configured to be able to.
Further, the supplied heat
図示の実施例において、発電電力量計測手段９は、石炭火力発電プラントに設けた電力計により発電電力量を計測して、１日当たりの発電電力量を記録するようにしてある。
石炭火力発電プラント効率計算手段４は、供給熱量算出手段１又は供給熱量補正手段３で算出した１日当たり供給熱量と、発電電力量計測手段９で計測した１日当たり発電電力量の比から石炭火力発電プラントの発電効率を計算することができるように構成してある。
In the illustrated embodiment, the generated power amount measuring means 9 measures the generated power amount with a wattmeter provided in the coal-fired power plant, and records the generated power amount per day.
The coal-fired power plant efficiency calculation means 4 calculates the coal-fired power generation from the ratio of the daily heat supply calculated by the supply heat quantity calculation means 1 or the supply heat quantity correction means 3 and the daily power generation amount measured by the power generation power measurement means 9. The power generation efficiency of the plant can be calculated.
図１に示す実施例において、記憶手段６は、石炭火力発電プラント効率計算手段４が計算した発電効率を自動的に記憶することができるようにしてある。
また、性能診断手段５は、石炭火力発電プラントの定期検査時や煤煙測定時等に、石炭火力発電プラントを一定の条件で運転して発電効率を測定し、この発電効率が所定の値を下回ったときに警告を発することにより、石炭火力発電プラントの性能診断を行うことができるように構成してある。また、性能診断手段５は、一定の条件で測定した発電効率を記憶手段６に蓄積しておき、蓄積された発電効率の推移傾向を分析して発電効率の低下傾向が続くときに石炭火力発電プラントの不具合を予測する不具合予測手段を備えた構成にすることも可能である。
In the embodiment shown in FIG. 1, the storage means 6 can automatically store the power generation efficiency calculated by the coal-fired power plant efficiency calculation means 4.
The performance diagnostic means 5 measures the power generation efficiency by operating the coal-fired power plant under a certain condition at the time of periodic inspection of the coal-fired power plant or measuring smoke, and the power generation efficiency falls below a predetermined value. When a warning is issued, the performance diagnosis of the coal-fired power plant can be performed. Further, the performance diagnosis means 5 stores the power generation efficiency measured under a certain condition in the storage means 6, analyzes the transition tendency of the stored power generation efficiency, and when the power generation efficiency continues to decrease, the coal-fired power generation It is also possible to adopt a configuration provided with a failure prediction means for predicting a failure of the plant.
次に、本発明に係る石炭火力発電プラント効率補正方法を図２に基づいて説明する。
先ず、日々の通常の運転時には、供給熱量算出手段１において、既定の単位発熱量と石炭火力発電プラントに１日に供給する石炭の供給量とから１日当たり供給熱量を算出する。また、供給熱量補正手段３において、水分割合測定手段８で測定した水分割合に基づいて、石炭の供給量から水分を除いた乾炭量を求め、この乾炭量と単位発熱量とから補正した供給熱量を算出する。
石炭火力発電プラント効率計算手段４においては、供給熱量補正手段３で算出した１日当たり供給熱量と、発電電力量計測手段９で計測した１日当たり発電電力量の比から、その日の石炭火力発電プラントの発電効率を計算する。
Next, a coal-fired power plant efficiency correction method according to the present invention will be described with reference to FIG.
First, during normal daily operation, the supplied heat amount calculation means 1 calculates a supplied heat amount per day from a predetermined unit calorific value and a supplied amount of coal supplied to the coal-fired power plant every day. Further, in the supplied heat
In the coal-fired power plant efficiency calculation means 4, the ratio of the daily supply heat amount calculated by the supply heat amount correction means 3 and the daily power generation amount measured by the generated power amount measurement means 9 is used to calculate the Calculate power generation efficiency.
次に、単位発熱量補正手段２において、石炭成分分析手段７において分析した１０日間の平均成分から石炭の単位発熱量を計算し、既定の単位発熱量を補正する。また、供給熱量算出手段１において、この補正後の単位発熱量により日々の石炭火力発電プラントへの供給熱量を再計算し、石炭火力発電プラント効率計算手段４によりこの１０日間の石炭火力発電プラントの発電効率を補正する。
また、性能診断手段５において、補正された発電効率に基づいて石炭火力発電プラントの性能診断を行うことができるように構成してある。
Next, the unit calorific value correction means 2 calculates the unit calorific value of coal from the average component of the 10 days analyzed by the coal component analysis means 7, and corrects the predetermined unit calorific value. In addition, the supply heat amount calculation means 1 recalculates the daily heat supply amount to the coal-fired power plant using the corrected unit calorific value, and the coal-fired power plant efficiency calculation means 4 recalculates the 10-day coal-fired power plant. Correct the power generation efficiency.
Further, the performance diagnosis means 5 is configured so that the performance diagnosis of the coal-fired power plant can be performed based on the corrected power generation efficiency.
１ 供給熱量算出手段
２ 単位発熱量補正手段
３ 供給熱量補正手段
４ 石炭火力発電プラント効率計算手段
５ 性能診断手段
６ 記憶手段
７ 石炭成分分析手段
８ 水分割合測定手段
９ 発電電力量計測手段
１０ 計算機
DESCRIPTION OF
Claims (8)
The coal-fired power plant efficiency correction system according to claim 7, further comprising a failure prediction unit that predicts a failure of the coal-fired power plant from the trend of the power generation efficiency stored in the storage unit.
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