JP4993560B2 - Coal type switching method and system for coal fired boiler - Google Patents
Coal type switching method and system for coal fired boiler Download PDFInfo
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本発明は、性状の異なる炭種を切り替えて使用する石炭火力ボイラにおいて、炭種の切替わりに合わせて石炭性状データを変更する石炭火力ボイラの炭種切替方法及びそのシステムを提供するものである。 The present invention provides a coal-fired boiler coal type switching method and system for changing coal property data in accordance with the switching of coal types in a coal-fired boiler that uses different types of coal.
従来、性状の異なる炭種を切り替えて使用する石炭火力ボイラにおいて、炭種を切り替える場合には、送炭する炭種変更の連絡を受けた時のバンカレベルから換算表により残炭量を算出し、１時間当たりの給炭量から概ねの炭種切替わり時刻を予測していた。オペレータは、該当バンカが予測した炭種切替わり時刻付近に到達したときに、石炭ミルの運転状況やボイラ効率等から炭種の切替わりを判断し、石炭ミルやボイラの運転制御に使用する石炭性状データの設定を変更していた。 Conventionally, when switching coal types in coal-fired boilers that switch coal types with different properties, the remaining coal amount is calculated from the bunker level when receiving notification of changes in the coal type to be sent. The estimated time of switching the type of coal was estimated from the amount of coal supplied per hour. When the operator arrives near the coal type switching time predicted by the relevant bunker, the operator determines the coal type switching from the operating status of the coal mill, boiler efficiency, etc., and uses the coal used for the operation control of the coal mill and boiler. The property data setting was changed.
従来の石炭火力ボイラの炭種切替方法では、切り替える炭種によって石炭ミルの運転状況に顕著な変化が現れない場合があり、炭種切替わりの判断が困難であるという課題があった。また、石炭性状データの変更のタイミングが、オペレータ個々の判断に委ねられていたために、オペレータの経験等により切替時刻にバラツキを生じ、石炭ミルやボイラの運転制御に影響を及ぼす恐れがあった。 In the conventional coal-type boiler coal type switching method, there is a case where a remarkable change does not appear in the operation status of the coal mill depending on the type of coal to be switched, and there is a problem that it is difficult to determine whether to switch the coal type. In addition, since the timing of changing the coal property data is left to the judgment of each operator, the switching time varies depending on the experience of the operator and the like, and there is a possibility of affecting the operation control of the coal mill and the boiler.
そこで、本発明は、オペレータの経験等による切替時刻判断のバラツキを無くし、的確なタイミングで石炭性状データを変更することができる石炭火力ボイラの炭種切替方法及びそのシステムを提供するものである。 Therefore, the present invention provides a coal type boiler coal type switching method and system capable of changing the coal property data at an appropriate timing, eliminating variations in switching time judgment due to the experience of the operator.
本発明は、上記課題を解決するために、性状の異なる炭種を切り替えて使用する石炭火力ボイラにおいて、切替前炭種の石炭バンカ内の残炭量と給炭量を計測して残炭の消費時間を推定する残炭消費時間推定工程と、石炭ミルの運転データの変化を検出して該石炭ミルに対応する石炭バンカの炭種切替わりを判断する炭種切替判断工程と、炭種切替わりを判断した石炭バンカの石炭性状データを変更する性状データ変更工程と、半数以上の石炭バンカの石炭性状データを変更したときにボイラ制御機構の設定を切替後炭種の設定に切り替えるボイラ制御機構切替工程とからなる石炭火力ボイラの炭種切替方法を提供するものである。 In order to solve the above problems, the present invention, in a coal-fired boiler that uses different coal types with different properties, measures the amount of remaining coal and the amount of coal supplied in the coal bunker of the coal type before switching, A remaining coal consumption time estimation step for estimating the consumption time, a coal type switching determination step for detecting a change in the operation data of the coal mill and determining the coal type switching of the coal bunker corresponding to the coal mill, The property data change process that changes the coal property data of the coal bunker that has been determined to be replaced, and the boiler control mechanism that switches the setting of the boiler control mechanism to the setting of the coal type after changing the coal property data of more than half of the coal bunker The present invention provides a coal type switching method for a coal-fired boiler comprising a switching step.
また、本発明は、前記炭種切替判断工程が、前記石炭ミルのミル差圧、ミル電流、ミル給炭量、ミル空気流量の何れか一つの運転データの変化を検出して炭種切替わりを判断するようにした請求項１に記載の石炭火力ボイラの炭種切替方法を提供するものである。 Further, according to the present invention, the coal type switching judgment step detects a change in operation data of any one of the mill differential pressure, the mill current, the mill coal supply amount, and the mill air flow rate of the coal mill to switch the coal type. The method for switching the coal type of the coal-fired boiler according to claim 1 is provided.
また、本発明は、前記炭種切替判断工程が、ボイラ燃焼データの変化を検出したときに、石炭性状データを未変更の石炭バンカの内、推定した残炭消費時間が最短の石炭バンカの炭種切替わりを判断する第二判断工程を備えた請求項１又は２に記載の石炭火力ボイラの炭種切替方法を提供するものである。 Further, according to the present invention, when the coal type switching determination step detects a change in boiler combustion data, the coal property data of coal bunker whose estimated remaining coal consumption time is the shortest among coal bunkers that have not been changed. The method for switching the coal type of a coal-fired boiler according to claim 1 or 2, further comprising a second determination step for determining whether or not the species is switched.
また、本発明は、前記第二判断工程が、ボイラ内熱量、ボイラ排気中の硫黄分濃度、ボイラ内温度分布、ボイラ効率の何れか一つの燃焼データの変化を検出して炭種切替わりを判断するようにした請求項３に記載の石炭火力ボイラの炭種切替方法を提供するものである。 Further, according to the present invention, the second determination step detects a change in combustion data of any one of the amount of heat in the boiler, the concentration of sulfur in the boiler exhaust, the temperature distribution in the boiler, and the boiler efficiency to change the coal type. The present invention provides a method for switching the coal type of a coal fired boiler according to claim 3.
また、本発明は、前記性状データ変更工程が、石炭性状データを未変更の石炭バンカの内、推定した残炭消費時間に予め設定した時間を加算したリミット時間を経過した石炭バンカの石炭性状データを変更するようにした請求項１乃至４の何れかに記載の石炭火力ボイラの炭種切替方法を提供するものである。 Further, the present invention provides the coal property data of the coal bunker in which the property data changing step has passed a limit time obtained by adding a preset time to the estimated remaining coal consumption time among the coal bunkers whose coal property data has not been changed. The coal type switching method for a coal-fired boiler according to any one of claims 1 to 4 is provided.
また、本発明は、性状の異なる炭種を切り替えて使用する石炭火力ボイラにおいて、切替前炭種の石炭バンカ内の残炭量と給炭量を計測して残炭の消費時間を推定する残炭消費時間推定手段と、石炭ミルの運転データの変化を検出して該石炭ミルに対応する石炭バンカの炭種切替わりを判断する炭種切替判断手段と、炭種切替わりを判断した石炭バンカの石炭性状データを変更する性状データ変更手段と、半数以上の石炭バンカの石炭性状データを変更したときにボイラ制御機構の設定を切替後炭種の設定に切り替えるボイラ制御機構切替手段とからなる石炭火力ボイラの炭種切替システムを提供するものである。 Further, the present invention is a coal-fired boiler that uses coal types having different properties by switching, and measures the remaining coal consumption and coal supply amount in the coal bunker of the coal type before switching to estimate the remaining coal consumption time. Coal consumption time estimation means, coal type switching judgment means for detecting change in coal mill operation data and judging the coal type switching of the coal bunker corresponding to the coal mill, and coal bunker judging the coal type switching Coal comprising property data changing means for changing the coal property data and boiler control mechanism switching means for switching the setting of the boiler control mechanism to the setting of the coal type after switching the coal property data of more than half of the coal bunker It provides a coal type switching system for a thermal power boiler.
また、本発明は、前記炭種切替判断手段が、前記石炭ミルのミル差圧、ミル電流、ミル給炭量、ミル空気流量等の運転データを計測する手段を有し、何れか一つの運転データの変化を検出して炭種切替わりを判断するようにした請求項６に記載の石炭火力ボイラの炭種切替システムを提供するものである。 In the present invention, the coal type switching determination unit includes a unit that measures operation data such as a mill differential pressure, a mill current, a mill coal supply amount, and a mill air flow rate of the coal mill. The coal type switching system for a coal-fired boiler according to claim 6, wherein the change of the data is detected to determine whether the coal type is switched.
また、本発明は、前記炭種切替判断手段が、ボイラ燃焼データの変化を検出したときに、石炭性状データを未変更の石炭バンカの内、推定した残炭消費時間が最短の石炭バンカの炭種切替わりを判断する第二判断手段を備えた請求項６又は７に記載の石炭火力ボイラの炭種切替システムを提供するものである。 Further, according to the present invention, when the coal type switching determination unit detects a change in boiler combustion data, the coal property data of the coal bunker having the shortest estimated remaining coal consumption time among the coal bunkers whose coal property data has not been changed. A coal type switching system for a coal-fired boiler according to claim 6 or 7, further comprising second judging means for judging the type switching.
また、本発明は、前記第二判断手段が、ボイラ内熱量、ボイラ排気中の硫黄分濃度、ボイラ内温度分布、ボイラ効率等の燃焼データを計測する手段を有し、何れか一つの燃焼データの変化を検出して炭種切替わりを判断するようにした請求項８に記載の石炭火力ボイラの炭種切替システムを提供するものである。 In the present invention, the second determination means includes means for measuring combustion data such as the amount of heat in the boiler, the concentration of sulfur in the boiler exhaust, the temperature distribution in the boiler, the boiler efficiency, and the like. The coal type switching system for a coal-fired boiler according to claim 8 is provided, wherein the change of the type is detected to determine whether the coal type is switched.
また、本発明は、前記性状データ変更手段が、石炭性状データを未変更の石炭バンカの内、推定した残炭消費時間に予め設定した時間を加算したリミット時間を経過した石炭バンカの石炭性状データを変更するようにした請求項６乃至９の何れかに記載の石炭火力ボイラの炭種切替システムを提供するものである。 Further, the present invention provides the coal property data of the coal bunker that has passed a limit time obtained by adding a preset time to the estimated remaining coal consumption time among the coal bunker that has not changed the coal property data. A coal type switching system for a coal fired boiler according to any one of claims 6 to 9 is provided.
本発明に係る石炭火力ボイラの炭種切替方法によれば、性状の異なる炭種を切り替えて使用する石炭火力ボイラにおいて、切替前炭種の石炭バンカ内の残炭量と給炭量を計測して残炭の消費時間を推定する残炭消費時間推定工程と、石炭ミルの運転データの変化を検出して該石炭ミルに対応する石炭バンカの炭種切替わりを判断する炭種切替判断工程と、炭種切替わりを判断した石炭バンカの石炭性状データを変更する性状データ変更工程と、半数以上の石炭バンカの石炭性状データを変更したときにボイラ制御機構の設定を切替後炭種の設定に切り替えるボイラ制御機構切替工程とからなる構成を有することにより、推定した残炭消費時間付近における石炭ミルの運転データの変化から石炭バンカの炭種切替わりを判断して該石炭バンカの石炭性状データを変更することができると共に、半数以上の石炭バンカの炭種が切替わったときに、ボイラ制御機構の設定も切替後炭種の設定に切り替えることができるから、的確なタイミングで石炭性状データを変更して効率の良い運転を継続することができる効果がある。 According to the coal-type boiler coal type switching method according to the present invention, in a coal-fired boiler that uses coal types with different properties, the remaining coal amount and coal supply amount in the coal bunker of the coal type before switching are measured. A remaining coal consumption time estimating step for estimating the consumption time of the remaining coal, and a coal type switching determining step for detecting a change in the operation data of the coal mill and determining the coal type switching of the coal bunker corresponding to the coal mill; The property data change process for changing the coal property data of the coal bunker that has been determined to switch the coal type, and the boiler control mechanism setting when the coal property data of more than half of the coal bunker has been changed to the setting of the coal type after switching And a boiler control mechanism switching step to switch the coal bunker's coal type change from the change in the operation data of the coal mill in the vicinity of the estimated remaining coal consumption time. The coal property data can be changed, and when more than half of the coal bunker coal types are switched, the boiler control mechanism settings can be switched to the coal type settings after switching. There is an effect that it is possible to continue the efficient operation by changing the property data.
また、本発明は、前記炭種切替判断工程が、前記石炭ミルのミル差圧、ミル電流、ミル給炭量、ミル空気流量の何れか一つの運転データの変化を検出して炭種切替わりを判断するようにした請求項１に記載の構成を有することにより、確実に石炭ミルの運転データの変化を検出して炭種切替わりを判断することができる効果がある。 Further, according to the present invention, the coal type switching judgment step detects a change in operation data of any one of the mill differential pressure, the mill current, the mill coal supply amount, and the mill air flow rate of the coal mill to switch the coal type. By having the configuration according to claim 1, it is possible to reliably detect a change in coal mill operation data and determine the change of coal type.
また、本発明は、前記炭種切替判断工程が、ボイラ燃焼データの変化を検出したときに、石炭性状データを未変更の石炭バンカの内、推定した残炭消費時間が最短の石炭バンカの炭種切替わりを判断する第二判断工程を備えた請求項１又は２に記載の構成により、炭種の切替わりによって石炭ミルの運転状況に変化が現れ難いときでも、ボイラ燃焼データの変化を検出して残炭消費時間が最短の石炭バンカの炭種切替わりを確実に判断することができる効果がある。 Further, according to the present invention, when the coal type switching determination step detects a change in boiler combustion data, the coal property data of coal bunker whose estimated remaining coal consumption time is the shortest among coal bunkers that have not been changed. The configuration according to claim 1 or 2 comprising a second determination step for determining whether or not the type is switched. Even when it is difficult for changes in the operation status of the coal mill to occur due to switching of the coal type, changes in boiler combustion data are detected. Thus, there is an effect that it is possible to reliably determine the coal type switching of the coal bunker having the shortest remaining coal consumption time.
また、本発明は、前記第二判断工程が、ボイラ内熱量、ボイラ排気中の硫黄分濃度、ボイラ内温度分布、ボイラ効率の何れか一つの燃焼データの変化を検出して炭種切替わりを判断するようにした請求項３に記載の構成を有することにより、確実にボイラの燃焼データの変化を検出して炭種切替わりを判断することができる効果がある。 Further, according to the present invention, the second determination step detects a change in combustion data of any one of the amount of heat in the boiler, the concentration of sulfur in the boiler exhaust, the temperature distribution in the boiler, and the boiler efficiency to change the coal type. By having the structure of Claim 3 made to judge, there exists an effect which can detect the change of the combustion data of a boiler and can judge the change of coal types reliably.
また、本発明は、前記性状データ変更工程が、石炭性状データを未変更の石炭バンカの内、推定した残炭消費時間に予め設定した時間を加算したリミット時間を経過した石炭バンカの石炭性状データを変更するようにした請求項１乃至４の何れかに記載の構成を有することにより、石炭ミルの運転データ及びボイラの燃焼データから炭種切替わりを検出できないときでも、リミット時間の経過によって炭種切替わりを判断して石炭バンカの石炭性状データを変更することができるから、石炭性状データの変更漏れを無くすることができる効果がある。 Further, the present invention provides the coal property data of the coal bunker in which the property data changing step has passed a limit time obtained by adding a preset time to the estimated remaining coal consumption time among the coal bunkers whose coal property data has not been changed. By the configuration according to any one of claims 1 to 4, the change in the coal type cannot be detected from the operation data of the coal mill and the combustion data of the boiler. Since it is possible to change the coal property data of the coal bunker by judging the species switching, there is an effect that it is possible to eliminate the change omission of the coal property data.
また、本発明に係る石炭火力ボイラの炭種切替システムによれば、性状の異なる炭種を切り替えて使用する石炭火力ボイラにおいて、切替前炭種の石炭バンカ内の残炭量と給炭量を計測して残炭の消費時間を推定する残炭消費時間推定手段と、石炭ミルの運転データの変化を検出して該石炭ミルに対応する石炭バンカの炭種切替わりを判断する炭種切替判断手段と、炭種切替わりを判断した石炭バンカの石炭性状データを変更する性状データ変更手段と、半数以上の石炭バンカの石炭性状データを変更したときにボイラ制御機構の設定を切替後炭種の設定に切り替えるボイラ制御機構切替手段とからなる構成を有することにより、推定した残炭消費時間付近における石炭ミルの運転データの変化から石炭バンカの炭種切替わりを判断して該石炭バンカの石炭性状データを変更することができると共に、半数以上の石炭バンカの炭種が切替わったときに、ボイラ制御機構の設定も切替後炭種の設定に切り替えることができるから、オペレータの経験等による切替時刻判断のバラツキを無くし、的確なタイミングで石炭性状データを変更して効率の良い運転を継続することができる効果がある。 In addition, according to the coal type boiler coal type switching system according to the present invention, in the coal fired boiler using different coal types having different properties, the remaining coal amount and the coal supply amount in the coal bunker of the coal type before switching are changed. The remaining coal consumption time estimation means for measuring and estimating the consumption time of the remaining coal, and the coal type switching judgment for detecting the change of the operation data of the coal mill and determining the coal type switching of the coal bunker corresponding to the coal mill And the property data changing means for changing the coal property data of the coal bunker that has been determined to switch the coal type, and when the coal property data of more than half of the coal bunker is changed, the setting of the boiler control mechanism is changed. By having a configuration comprising a boiler control mechanism switching means for switching to a setting, it is possible to determine the coal bunker coal type switching based on changes in the operation data of the coal mill near the estimated remaining coal consumption time. It is possible to change the coal property data of the bunker, and when the coal type of more than half of the coal bunker is switched, the setting of the boiler control mechanism can be switched to the setting of the coal type after switching. As a result, there is an effect that the variation in the switching time judgment due to, for example, can be eliminated, and the coal property data can be changed at an appropriate timing to continue the efficient operation.
また、本発明は、前記炭種切替判断手段が、前記石炭ミルのミル差圧、ミル電流、ミル給炭量、ミル空気流量等の運転データを計測する手段を有し、何れか一つの運転データの変化を検出して炭種切替わりを判断するようにした請求項６に記載の構成を有することにより、確実に石炭ミルの運転データの変化を検出して炭種切替わりを判断することができる効果がある。 In the present invention, the coal type switching determination unit includes a unit that measures operation data such as a mill differential pressure, a mill current, a mill coal supply amount, and a mill air flow rate of the coal mill. By detecting the change of data and judging the change of the coal type, the change of the operation data of the coal mill is surely detected to judge the change of the coal type. There is an effect that can.
また、本発明は、前記炭種切替判断手段が、ボイラ燃焼データの変化を検出したときに、石炭性状データを未変更の石炭バンカの内、推定した残炭消費時間が最短の石炭バンカの炭種切替わりを判断する第二判断手段を備えた請求項６又は７に記載の構成により、炭種の切替わりによって石炭ミルの運転状況に変化が現れ難いときでも、ボイラ燃焼データの変化を検出して残炭消費時間が最短の石炭バンカの炭種切替わりを確実に判断することができる効果がある。 Further, according to the present invention, when the coal type switching determination unit detects a change in boiler combustion data, the coal property data of the coal bunker having the shortest estimated remaining coal consumption time among the coal bunkers whose coal property data has not been changed. The configuration according to claim 6 or 7 further comprising second determination means for determining the type switching, even when it is difficult for changes in the operating status of the coal mill due to the switching of the coal type to detect changes in boiler combustion data. Thus, there is an effect that it is possible to reliably determine the coal type switching of the coal bunker having the shortest remaining coal consumption time.
また、本発明は、前記第二判断手段が、ボイラ内熱量、ボイラ排気中の硫黄分濃度、ボイラ内温度分布、ボイラ効率等の燃焼データを計測する手段を有し、何れか一つの燃焼データの変化を検出して炭種切替わりを判断するようにした請求項８に記載の構成を有することにより、確実にボイラの燃焼データの変化を検出して炭種切替わりを判断することができる効果がある。 In the present invention, the second determination means includes means for measuring combustion data such as the amount of heat in the boiler, the concentration of sulfur in the boiler exhaust, the temperature distribution in the boiler, the boiler efficiency, and the like. With the configuration according to claim 8, wherein the change of the coal type is detected and the change of the coal type is determined, it is possible to reliably detect the change of the combustion data of the boiler and determine the change of the coal type. effective.
また、本発明は、前記性状データ変更手段が、石炭性状データを未変更の石炭バンカの内、推定した残炭消費時間に予め設定した時間を加算したリミット時間を経過した石炭バンカの石炭性状データを変更するようにした請求項６乃至９の何れかに記載の構成を有することにより、石炭ミルの運転データ及びボイラの燃焼データから炭種切替わりを検出できないときでも、リミット時間の経過によって炭種切替わりを判断して石炭バンカの石炭性状データを変更することができるから、石炭性状データの変更漏れを無くすることができる効果がある。 Further, the present invention provides the coal property data of the coal bunker that has passed a limit time obtained by adding a preset time to the estimated remaining coal consumption time among the coal bunker that has not changed the coal property data. By changing the coal type change from the operation data of the coal mill and the combustion data of the boiler, it is possible to detect the charcoal as the limit time elapses. Since it is possible to change the coal property data of the coal bunker by judging the species switching, there is an effect that it is possible to eliminate the change omission of the coal property data.
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。
図１に示すように、本発明に係る石炭火力ボイラの炭種切替システムは、性状の異なる炭種を切り替えて使用する石炭火力ボイラにおいて、切替前炭種の石炭バンカ内の残炭量と給炭量を計測して残炭の消費時間を推定する残炭消費時間推定手段１０と、石炭ミルの運転データの変化を検出して該石炭ミルに対応する石炭バンカの炭種切替わりを判断する炭種切替判断手段２０と、炭種切替わりを判断した石炭バンカの石炭性状データを変更する性状データ変更手段３０と、半数以上の石炭バンカの石炭性状データを変更したときにボイラ制御機構の設定を切替後炭種の設定に切り替えるボイラ制御機構切替手段４０とから構成してある。
Embodiments of the present invention will be described based on examples shown in the drawings.
As shown in FIG. 1, the coal type boiler coal type switching system according to the present invention is a coal-fired boiler that uses a type of coal with different properties and uses the remaining coal amount and supply in the coal bunker of the type before switching. The remaining coal consumption time estimation means 10 for measuring the amount of coal and estimating the consumption time of the remaining coal, and detecting a change in the operation data of the coal mill to determine the change of the coal bunker type corresponding to the coal mill. Setting of the boiler control mechanism when changing the coal property data of the coal type switching judgment means 20, the property data changing means 30 for changing the coal property data of the coal bunker for which the coal type switching has been changed, and more than half of the coal bunker Is configured with a boiler control mechanism switching means 40 for switching to the setting of the coal type after switching.
図示の実施例において、消費時間推定手段１０は、図２に示すように、第一推定手段１１と第二推定手段１２とからなり、切替前炭種の石炭バンカ内の残炭量と給炭量を計測して残炭の消費時間を推定することができるように構成してある。
第一推定手段１１は、切替後炭種の送炭を開始したときに、各石炭バンカ内の残炭量と単位時間当たりの給炭量を計測し、この残炭量を単位時間当たりの給炭量で除算して、各石炭バンカの残炭消費時間を推定するようにしてある。また、第一推定手段１１は、図６に示すように、推定残炭時間から予め定めた時間を減算して、各石炭バンカの炭種切替わり判断を開始させる判断開始時刻を設定することができるようにしてある。
In the illustrated embodiment, the consumption time estimation means 10 comprises a first estimation means 11 and a second estimation means 12 as shown in FIG. 2, and the remaining coal amount and coal supply in the coal bunker of the coal type before switching. It is configured so that the consumption time of the remaining coal can be estimated by measuring the amount.
The first estimating means 11 measures the amount of remaining coal in each coal bunker and the amount of coal supplied per unit time when starting the coal transfer after switching, and this amount of remaining coal is supplied per unit time. By dividing by the amount of coal, the remaining coal consumption time of each coal bunker is estimated. In addition, as shown in FIG. 6, the first estimating means 11 can set a determination start time for starting the determination of changing the coal type of each coal bunker by subtracting a predetermined time from the estimated remaining coal time. I can do it.
第二推定手段１２は、切替後炭種の送炭を開始したときから各石炭バンカの積算消費量を計測する積算消費量計測手段を備え、この積算消費量と残炭量を比較して各石炭バンカの残炭消費時間を推定するようにしてある。また、第二推定手段１２は、残炭量と積算消費量の差が予め定めた設定量になったときに、各石炭バンカの炭種切替わり判断を開始させるように構成してある。 The second estimating means 12 includes an integrated consumption measuring means for measuring the integrated consumption of each coal bunker from the start of coal transfer after switching, and compares the integrated consumption with the remaining coal amount to compare each The remaining coal consumption time of the coal bunker is estimated. Moreover, the 2nd estimation means 12 is comprised so that the coal type switching judgment of each coal bunker may be started when the difference between the amount of remaining coal and the accumulated consumption becomes a predetermined set amount.
図示の実施例において、消費時間推定手段１０は、石炭火力ボイラの負荷が一定の場合には、各石炭バンカにおいて、第一推定手段１１により設定した判断開始時刻に到達したとき、又は第二推定手段１２が判断開始時刻であると判断したときの何れか早いときに、該当石炭バンカの炭種切替わり判断を開始させるようにしてある。
また、消費時間推定手段１０は、石炭火力ボイラの負荷が変動する場合には、第一推定手段１１によらず、第二推定手段１２が判断開始時刻であると判断したときに、該当石炭バンカの炭種切替わり判断を開始させるようにしてある。
In the embodiment shown in the figure, the consumption time estimation means 10, when the load of the coal-fired boiler is constant, reaches the judgment start time set by the first estimation means 11 in each coal bunker, or the second estimation When the means 12 determines that it is the determination start time, whichever is earlier, the determination of switching the coal type of the corresponding coal bunker is started.
Further, when the load of the coal fired boiler fluctuates, the consumption time estimation means 10 does not depend on the first estimation means 11 but when the second estimation means 12 determines that the determination start time is reached, the corresponding coal bunker Judgment of switching between coal types is started.
図示の実施例において、炭種切替判断手段２０は、図３に示すように、石炭ミルの運転データの変化を検出して該石炭ミルに対応する石炭バンカの炭種切替わりを判断する第一判断手段２１と、ボイラ燃焼データの変化を検出し、石炭性状データを未変更の石炭バンカの内、推定した残炭消費時間が最短の石炭バンカの炭種切替わりを判断する第二判断手段２２とから構成してある。
In the illustrated embodiment, as shown in FIG. 3, the coal type switching determining
第一判断手段２１は、図４に示すように、石炭ミルのミル差圧、ミル電流、ミル給炭量、ミル空気流量の何れか一つの運転データの変化を検出して、該石炭ミルに対応する石炭バンカの炭種切替わりを判断することができるように構成してある。第一判断手段２１は、ミル差圧、ミル電流、ミル給炭量、ミル空気流量の運転データ毎に変化を検出する閾値を設定することができるようにしてある。 As shown in FIG. 4, the first determination means 21 detects a change in one of the operation data of the mill differential pressure, the mill current, the mill feed amount, and the mill air flow rate of the coal mill. It is configured so that it is possible to determine whether the corresponding coal bunker changes the coal type. The first determination means 21 can set a threshold value for detecting a change for each operation data of a mill differential pressure, a mill current, a mill coal supply amount, and a mill air flow rate.
第二判断手段２２は、図５に示すように、ボイラ内熱量、ボイラ排気中の硫黄分濃度、ボイラ内温度分布、ボイラ効率の何れか一つの燃焼データの変化を検出して、その時点で石炭性状データを未変更の石炭バンカの内、推定した残炭消費時間が最短の石炭バンカの炭種切替わりを判断することができるように構成してある。第二判断手段２２は、ボイラ内熱量、ボイラ排気中の硫黄分濃度、ボイラ内温度分布、ボイラ効率の燃焼データ毎に変化を検出する閾値を設定することができるようにしてある。 As shown in FIG. 5, the second determination means 22 detects a change in combustion data of any one of the amount of heat in the boiler, the sulfur concentration in the boiler exhaust, the temperature distribution in the boiler, and the boiler efficiency. Among the coal bunker whose coal property data is not changed, it is configured to be able to judge the coal type switching of the coal bunker having the shortest estimated remaining coal consumption time. The second determination means 22 can set a threshold value for detecting a change for each combustion data of the amount of heat in the boiler, the concentration of sulfur in the boiler exhaust, the temperature distribution in the boiler, and the boiler efficiency.
図示の実施例において、性状データ変更手段３０は、図３に示すように、第一判断手段２１又は第二判断手段２２において炭種切替わりを判断した石炭バンカに設定された石炭性状データを切替後炭種の石炭性状データに変更することができるように構成してある。
また、性状データ変更手段３０は、石炭性状データを未変更の石炭バンカの内、残炭消費時間推定手段１０で推定した残炭消費時間に予め設定した時間を加算したリミット時間を経過した石炭バンカの石炭性状データを切替後炭種の石炭性状データに変更することができるようにしてある。このとき、推定残炭消費時間には、負荷一定の場合に第一推定手段１１が推定した時間を、負荷変動の場合に第二推定手段１２が推定した時間を使用することができる。
In the illustrated embodiment, the property data changing means 30 switches the coal property data set in the coal bunker for which the first judgment means 21 or the second judgment means 22 has determined that the coal type has been switched, as shown in FIG. It is configured so that it can be changed to coal property data of the post coal type.
Further, the property
図示の実施例において、ボイラ制御機構切替手段４０は、図１に示すように、性状データ変更手段３０が半数以上の石炭バンカの石炭性状データを変更したときに、ボイラ制御機構の設定を切替後炭種の設定に切り替えることができるように構成してある。
また、本発明に係る炭種切替システムは、炭種別の発熱量・湿分等の性状データを記憶した記憶手段を備え、切替後の炭種番号及び比率を入力することにより、性状データ変更手段３０及びボイラ制御機構切替手段４０が自動的に石炭性状データを変更することができるようにしてある。
In the illustrated embodiment, as shown in FIG. 1, the boiler control mechanism switching means 40 switches the setting of the boiler control mechanism when the property data changing means 30 changes the coal property data of more than half of the coal bunker. It is comprised so that it can switch to the setting of a charcoal type.
In addition, the coal type switching system according to the present invention includes a storage unit that stores property data such as calorific value and moisture of each type of coal, and inputs a coal type number and a ratio after switching, thereby changing the property data change unit. 30 and the boiler control mechanism switching means 40 can automatically change the coal property data.
次に、本発明に係る石炭火力ボイラの炭種切替システムの作用を、図６に示す実施例に基づいて説明する。
石炭火力ボイラの負荷が定格出力の一定の場合に、第一推定手段１１は、切替後炭種の送炭開始時刻を入力すると、送炭開始時刻に各石炭バンカ内の残炭量と単位時間当たりの給炭量を計測し、各石炭バンカの残炭消費時間を推定する。
Next, the effect | action of the coal type switching system of the coal-fired boiler which concerns on this invention is demonstrated based on the Example shown in FIG.
When the load of the coal-fired boiler is constant at the rated output, the first estimating means 11 inputs the coal transfer start time of the coal type after switching, and the remaining coal amount and unit time in each coal bunker at the coal transfer start time. The amount of coal supply per unit is measured and the remaining coal consumption time of each coal bunker is estimated.
炭種切替判断手段２０は、推定残炭時間から予め定めた時間を減算した判断開始時刻になると、該当石炭バンカの炭種切替わり判断を開始する。第一判断手段２１は、石炭ミルの運転データの変化を検出して、該運転データの変化を検出したときに（図中の三角印）石炭バンカの炭種切替わりを判断し、性状データ変更手段３０が石炭性状データを切替後炭種の石炭性状データに変更する。 The coal type switching judgment means 20 starts the judgment of switching the coal type of the corresponding coal bunker when the judgment start time is obtained by subtracting a predetermined time from the estimated remaining coal time. The first judging means 21 detects a change in the operation data of the coal mill, and when the change in the operation data is detected (triangle mark in the figure), determines the change of the coal bunker's coal type and changes the property data. The means 30 changes the coal property data to the coal property data of the coal type after switching.
また、第二判断手段２２は、ボイラの燃焼データの変化を検出して、その時点（図中の四角印）で石炭性状データを未変更の石炭バンカの内、推定した残炭消費時間が最短の石炭バンカの炭種切替わりを判断する。図６において、ボイラの燃焼データの変化を検出したときに石炭性状データを未変更の石炭バンカはＢ，Ｄ，Ｅであり、第二判断手段２２は、この内推定した残炭消費時間が最短の石炭バンカＥが炭種切替わりと判断し、性状データ変更手段３０が石炭性状データを切替後炭種の石炭性状データに変更する。 The second judging means 22 detects the change in the combustion data of the boiler, and the estimated remaining coal consumption time is the shortest among the coal bunkers whose coal property data has not been changed at that time (square mark in the figure). Judge the change of coal type of coal bunker. In FIG. 6, the coal bunker whose coal property data is not changed when the change in the combustion data of the boiler is detected is B, D, E, and the second judgment means 22 uses the shortest remaining coal consumption time estimated. The coal bunker E determines that the coal type is switched, and the property data changing means 30 changes the coal property data to the coal property data of the coal type after switching.
さらに、性状データ変更手段３０は、第一判断手段２１及び第二判断手段２２の何れもが炭種切替わりを判断しないときに、推定残炭消費時間に予め設定した時間を加算したリミット時間を経過した石炭バンカＤの石炭性状データを切替後炭種の石炭性状データに変更する。
Further, the property
ボイラ制御機構切替手段４０は、図６において６台の石炭バンカＡ〜Ｅの内、半数以上となる３台目の石炭バンカＡの石炭性状データを変更したときに、ボイラ制御機構の設定を切替後炭種の設定に切り替える。また、図示の実施例の場合、ボイラ制御機構切替手段４０は、上記条件に加えて石炭火力ボイラの負荷が定格出力の一定になったときにボイラ制御機構の設定を切替後炭種の設定に切り替えるようにしてある。 The boiler control mechanism switching means 40 switches the setting of the boiler control mechanism when the coal property data of the third coal bunker A, which is more than half of the six coal bunkers A to E in FIG. Switch to the setting of the rear coal type. In addition, in the illustrated embodiment, the boiler control mechanism switching means 40 changes the setting of the boiler control mechanism to the setting of the coal type after switching when the load of the coal-fired boiler reaches a constant rated output in addition to the above conditions. I'm trying to switch.
１０ 残炭消費時間推定手段
１１ 第一推定手段
１２ 第二推定手段
２０ 炭種切替判断手段
２１ 第一判断手段
２２ 第二判断手段
３０ 性状データ変更手段
４０ ボイラ制御機構切替手段
DESCRIPTION OF
Claims (6)
切替前炭種の石炭バンカ内の残炭量と給炭量を計測して残炭の消費時間を推定する残炭消費時間推定工程と、
石炭ミルの運転データの変化を検出して該石炭ミルに対応する石炭バンカの炭種切替わりを判断する炭種切替判断工程と、
炭種切替わりを判断した石炭バンカの石炭性状データを変更する性状データ変更工程と、
半数以上の石炭バンカの石炭性状データを変更したときにボイラ制御機構の設定を切替後炭種の設定に切り替えるボイラ制御機構切替工程と、を有し、
前記炭種切替判断工程が、ボイラ燃焼データの変化を検出したときに、石炭性状データを未変更の石炭バンカの内、推定した残炭消費時間が最短の石炭バンカの炭種切替わりを判断する第二判断工程を備え、
前記性状データ変更工程が、石炭性状データを未変更の石炭バンカの内、推定した残炭消費時間に予め設定した時間を加算したリミット時間を経過した石炭バンカの石炭性状データを変更するようにした石炭火力ボイラの炭種切替方法。 In coal-fired boilers that use different coal types with different properties,
A residual coal consumption time estimation step for estimating the consumption time of the residual coal by measuring the residual coal amount and the coal supply amount in the coal bunker of the coal type before switching,
A coal type switching determination step of detecting a change in the operation data of the coal mill and determining whether or not the coal bunker corresponding to the coal mill is switched;
A property data changing process for changing the coal property data of the coal bunker that has determined whether or not to switch the coal type,
A boiler control mechanism switching step of switching the setting of the boiler control mechanism to the setting of the coal type after switching the coal property data of more than half of the coal bunker ,
When the coal type switching determination step detects a change in boiler combustion data, it determines the coal type switching of the coal bunker with the shortest estimated coal consumption time among coal bunkers whose coal property data has not been changed. A second determination step,
The property data changing step changes the coal property data of the coal bunker that has passed the limit time obtained by adding a preset time to the estimated remaining coal consumption time among the coal bunkers whose coal property data has not been changed. Coal type switching method for coal fired boilers.
切替前炭種の石炭バンカ内の残炭量と給炭量を計測して残炭の消費時間を推定する残炭消費時間推定手段と、
石炭ミルの運転データの変化を検出して該石炭ミルに対応する石炭バンカの炭種切替わりを判断する炭種切替判断手段と、
炭種切替わりを判断した石炭バンカの石炭性状データを変更する性状データ変更手段と、
半数以上の石炭バンカの石炭性状データを変更したときにボイラ制御機構の設定を切替後炭種の設定に切り替えるボイラ制御機構切替手段と、を有し、
前記炭種切替判断手段が、ボイラ燃焼データの変化を検出したときに、石炭性状データを未変更の石炭バンカの内、推定した残炭消費時間が最短の石炭バンカの炭種切替わりを判断する第二判断手段を備え、
前記性状データ変更手段が、石炭性状データを未変更の石炭バンカの内、推定した残炭消費時間に予め設定した時間を加算したリミット時間を経過した石炭バンカの石炭性状データを変更するようにした石炭火力ボイラの炭種切替システム。 In coal-fired boilers that use different coal types with different properties,
A residual coal consumption time estimation means for estimating the consumption time of the remaining coal by measuring the amount of remaining coal and the amount of coal supply in the coal bunker of the coal type before switching
Coal type switching judgment means for detecting a change in the operation data of the coal mill and judging the coal type switching of the coal bunker corresponding to the coal mill;
Property data changing means for changing the coal property data of the coal bunker that has determined whether to switch the coal type,
Boiler control mechanism switching means for switching the setting of the boiler control mechanism to the setting of the coal type after switching the coal property data of more than half of the coal bunker ,
When the coal type switching determining means detects a change in boiler combustion data, it determines the coal type switching of the coal bunker with the shortest estimated remaining coal consumption time among coal bunkers whose coal property data is not changed. Having a second judging means,
The property data changing means is configured to change the coal property data of the coal bunker that has passed a limit time obtained by adding a preset time to the estimated remaining coal consumption time among the coal bunkers that have not changed the coal property data. Coal type switching system for coal fired boilers.
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