WO2018225481A1 - Système, procédé et programme de sortie de taux de réduction de combustible - Google Patents

Système, procédé et programme de sortie de taux de réduction de combustible Download PDF

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Publication number
WO2018225481A1
WO2018225481A1 PCT/JP2018/019302 JP2018019302W WO2018225481A1 WO 2018225481 A1 WO2018225481 A1 WO 2018225481A1 JP 2018019302 W JP2018019302 W JP 2018019302W WO 2018225481 A1 WO2018225481 A1 WO 2018225481A1
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WO
WIPO (PCT)
Prior art keywords
reduction rate
fuel reduction
main steam
steam pressure
fuel
Prior art date
Application number
PCT/JP2018/019302
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English (en)
Japanese (ja)
Inventor
大助 神柱
谷口　一徳
山下　亨
雄治 岡村
伸浩 鹿島
健一郎 首藤
Original Assignee
出光興産株式会社
郵船商事株式会社
日本郵船株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 出光興産株式会社, 郵船商事株式会社, 日本郵船株式会社 filed Critical 出光興産株式会社
Priority to AU2018280740A priority Critical patent/AU2018280740B2/en
Priority to CN201880037976.2A priority patent/CN110832251B/zh
Priority to KR1020197036400A priority patent/KR102469420B1/ko
Publication of WO2018225481A1 publication Critical patent/WO2018225481A1/fr

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B35/00—Control systems for steam boilers
    • F22B35/18—Applications of computers to steam boiler control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B35/00—Control systems for steam boilers

Definitions

  • the present invention relates to a technology for controlling combustion of a boiler, and in particular, is applied to a fuel reduction rate output system, a fuel reduction rate output method, and a fuel reduction rate output program for calculating a fuel reduction rate obtained by improving boiler efficiency. It is related to effective technology.
  • fuel solid fuel such as coal, liquid fuel, or gaseous fuel
  • the boiler furnace
  • the heat is absorbed by the heat exchanger.
  • the generated steam is converted from thermal energy into rotational motion by being supplied to a steam turbine, for example, and used for power generation by a generator.
  • the amount of fuel input to the boiler is a load requirement amount (for example, a power generation requirement amount MWD (Mega Watt Demand), and may be referred to as a load requirement amount MWD in the following), and a fuel injection amount (hereinafter referred to as a fuel requirement amount MWD).
  • the fuel function FX which is a relational expression between the boiler input command value BID (may be described as Boiler Input Demand).
  • Patent Document 1 As a technique related to this, for example, in Japanese Patent No. 4522326 (Patent Document 1), a plurality of ratios or differences between values before and after feedback correction are sequentially updated and stored, and the stored multiple values are used. It is described that a fuel correction coefficient is obtained and a value after feedback correction is corrected by this correction coefficient. Thus, it is possible to correct the fuel injection amount in consideration of changes in the thermal efficiency of the boiler due to the influence of various factors.
  • Patent Document 2 a fuel correction coefficient for correcting a value after feedback correction is subdivided into three elements in a multiple-type fuel mixed combustion boiler. It is described that the amount of fuel input to the boiler is corrected in accordance with the difference in unit calorific value and the difference in boiler thermal efficiency due to the change in the mixed combustion rate.
  • the value of the load request amount MWD before and after the feedback correction is compared as needed for changes in the thermal efficiency of the boiler due to the influence of various factors. It is possible to determine this by measuring, and acquire the value of the correction coefficient for further correcting and optimizing the value after feedback correction based on the determination result by self-learning.
  • the efficiency of the boiler can be improved.
  • a performance test is performed and actually measured. There was a need. Specifically, for example, the operation / non-operation of the control function related to energy saving is switched, the fuel consumption amount and the steam generation amount are respectively compared between the operation period and the non-operation period, and the fuel reduction rate is calculated.
  • the method that requires such a performance test is a roundabout, and it is impossible to estimate the fuel reduction rate in real time during operation.
  • an object of the present invention is to provide a fuel reduction rate output system, a fuel reduction rate output method, and a fuel reduction rate that can output the fuel reduction rate obtained by improving the controllability of the boiler, that is, the energy saving rate in real time. To provide an output program.
  • a boiler combustion control system is a fuel reduction applied to a boiler combustion control system that supplies fuel related to the amount of fuel input to the boiler calculated with respect to the required load amount to the boiler.
  • a fuel reduction rate output system for calculating a fuel reduction rate related to a response, wherein a history of measured main steam pressure that is a measured main steam pressure of the boiler is recorded as a main steam pressure history, and the main steam pressure history and A deviation determining unit that calculates a deviation from the measured main steam pressure, and outputs a history of main steam pressure whose deviation is within a predetermined range as a history of control main steam pressure, and the control output by the deviation determining unit
  • a standard deviation calculation unit that calculates a standard deviation based on a history of main steam pressure, a standard deviation improvement rate is calculated based on the standard deviation calculated by the standard deviation calculation unit, and the standard deviation improvement rate and the And fuel reduction rate output unit calculates and outputs said fuel reduction rate based on the reference equation showing the relationship between the cost reduction rate, and has
  • the present invention can also be applied to a fuel reduction rate output method in the fuel reduction rate output system as described above, and a fuel reduction rate output program that causes a computer to operate as the fuel reduction rate output system as described above.
  • the fuel reduction rate obtained by improving the controllability of the boiler that is, the energy saving rate can be output in real time.
  • FIG. 1 is a diagram showing an outline of a configuration example of a fuel reduction rate output system according to an embodiment of the present invention.
  • the control for the boiler 2 is performed by an existing boiler combustion control system 4.
  • the boiler combustion control system 4 receives the load request amount MWD and determines a boiler input command value BID that is a fuel input amount to the boiler by a fuel function (not shown). For example, when this boiler combustion control system 4 is newly updated or additionally installed, or when measures are taken to improve controllability as shown in Patent Documents 1 and 2, etc., fuel reduction can be expected.
  • the fuel reduction rate output system 1 reduces the fuel based on the standard deviation of the main vapor pressure of the boiler 2 as described later.
  • the rate 15 is calculated and output in real time.
  • the fuel reduction rate output system 1 is configured to be added to the boiler combustion control system 4 as an individual system, but is configured to be incorporated as a part of the boiler combustion control system 4. May be. Further, in the example of FIG. 1, the fuel reduction rate output system 1 is configured to output the calculated fuel reduction rate 15 as data, but this is displayed on a display (not shown) or printed on a printer in a predetermined format or layout. It is good also as a structure which has a display part which carries out and outputs. By having such a display part, the fuel reduction rate 15 (or fuel reduction amount) can be grasped instantaneously.
  • the fuel reduction rate output system 1 may be configured as, for example, a device that is implemented by hardware including a semiconductor circuit (not shown), a microcomputer, or the like that executes processing related to each function described below. Alternatively, it is composed of general-purpose server devices, virtual servers built on cloud computing services, etc., and expanded on memory from a recording device such as HDD (Hard Disk Drive) by a CPU (Central Processing Unit) (not shown) By executing middleware such as an OS (Operating System) or software operating on the middleware, processing related to each function described later may be executed.
  • middleware such as an OS (Operating System) or software operating on the middleware
  • the configuration is not limited to a configuration in which the entirety is mounted in one casing, and a configuration in which some functions are mounted in another casing and the casings are mutually connected by a communication cable or the like may be used. That is, the mounting form of the fuel reduction rate output system 1 is not particularly limited, and can be configured flexibly as appropriate according to the plant environment and the like.
  • the fuel reduction rate output system 1 includes various units such as a deviation determination unit 11, a standard deviation calculation unit 12, and a fuel reduction rate output unit 13 implemented by hardware or software.
  • a main vapor pressure history 14 implemented as a file, table, or database recorded in a memory, HDD, or the like.
  • the fuel reduction rate output system 1 has some kind of fuel reduction contribution to the boiler combustion control system 4 (or other system added to the boiler combustion control system 4). It is assumed that When energy saving is performed in response to such a fuel reduction contribution, in particular, when controllability is improved by conventional techniques as described in Patent Documents 1 and 2, the pressure of the main steam generated by the boiler 2 The fluctuation of becomes smaller. Thereby, the fluctuation
  • the estimated value of the fuel reduction rate is calculated by the following method.
  • the current measured main steam pressure PV is input from the main steam pressure transmitter PX to the deviation determination unit 11 of the fuel reduction rate output system 1.
  • the deviation determination unit 11 for example, within a predetermined time period (for example, within the past 60 minutes) recorded in the measured main vapor pressure PV and the main vapor pressure history 14 at regular intervals such as once per minute. Compare with the history of main vapor pressure.
  • the main vapor pressure history 14 records at least the measurement value of the main vapor pressure over the past predetermined time (for example, 60 minutes) at a frequency equal to or higher than the predetermined interval (for example, 1 minute interval). It is assumed that
  • the deviation determining unit 11 extracts a history of main steam pressure within a range of, for example, about ⁇ 5% with respect to the current measured main steam pressure PV from the main steam pressure history 14, and counts the number thereof. If this number is equal to or greater than a predetermined number (for example, more than half of all historical data in the extracted population (in other words, more than half of the above-mentioned fixed period)), It is judged that it is controlled in a stable state at a value similar to the measured main steam pressure PV of the above, and the history information of the extracted main steam pressure (hereinafter sometimes referred to as “control main steam pressure”) Is output to the standard deviation calculator 12.
  • a predetermined number for example, more than half of all historical data in the extracted population (in other words, more than half of the above-mentioned fixed period)
  • the standard deviation calculation unit 12 obtains the standard deviation based on the input history of the control main vapor pressure and outputs it to the fuel reduction rate output unit 13.
  • the standard deviation improvement rate (%) is calculated by the following formula.
  • the control standard deviation is the standard deviation of the history of the input control main steam pressure
  • the standard deviation before correspondence is the standard deviation of the history of main steam pressure in the state before the fuel reduction contribution correspondence is made. It is.
  • the standard deviation before response (that is, the control main vapor pressure in the state before the target fuel reduction contribution response is made), which is the basis for calculating the improvement rate, is, for example, before the target fuel reduction contribution response is made Obtain and record in advance. Alternatively, it may be set as a predetermined variable function so that the coefficient can be appropriately changed.
  • the fuel reduction rate output unit 13 calculates an estimated value of the fuel reduction rate from the input standard deviation improvement rate based on a predetermined mathematical formula and outputs the estimated value.
  • FIG. 2 is a diagram showing an example of the relationship between the improvement rate of the standard deviation of the main vapor pressure and the fuel reduction rate in the present embodiment.
  • the horizontal axis (x axis) is the standard deviation improvement rate (%) of the main steam pressure
  • the vertical axis (y axis) is the fuel reduction rate (%).
  • a plot of actual results when various types of fuel reduction contribution responses are made is shown.
  • the fuel reduction rate output unit 13 calculates the estimated value of the fuel reduction rate by applying the standard deviation improvement rate input to the linearly approximated reference equation.
  • the fuel reduction rate output unit 13 is configured to have one fuel reduction rate output unit 13. However, the fuel reduction rate output unit 13 is provided for each measured main vapor pressure PV (load band). It is good also as a structure which provides and uses multiple. Alternatively, a single fuel reduction rate output unit 13 may be configured to use a plurality of reference expressions indicating the relationship between the standard deviation improvement rate and the fuel reduction rate for each load band. Further, the above-described reference expression may be set as a predetermined variable function so that the coefficient can be changed as appropriate. In the present embodiment, an estimated value of the fuel reduction rate (%) is calculated and output. However, this is multiplied by the boiler input command value BID (the amount of fuel input to the boiler 2) to reduce the fuel. It may be output as a quantity.
  • BID the amount of fuel input to the boiler 2
  • the present invention made by the present inventor has been specifically described based on the embodiments.
  • the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention. Needless to say.
  • the above-described embodiment has been described in detail for easy understanding of the present invention, and is not necessarily limited to the one having all the configurations described.
  • each of the above-described configurations, functions, processing units, processing means, and the like may be realized by hardware by designing a part or all of them with, for example, an integrated circuit.
  • Each of the above-described configurations, functions, and the like may be realized by software by interpreting and executing a program that realizes each function by the processor.
  • Information such as programs, tables, and files for realizing each function can be stored in a recording device such as a memory, a hard disk, or an SSD (Solid State Drive), or a recording medium such as an IC card, an SD card, or a DVD.
  • control lines and information lines indicate what is considered necessary for explanation, and not all control lines and information lines on mounting are necessarily shown. Actually, it may be considered that almost all the components are connected to each other.
  • the present invention is applicable to a fuel reduction rate output system, a fuel reduction rate output method, and a fuel reduction rate output program for calculating a fuel reduction rate obtained by improving boiler efficiency.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Steam Boilers And Waste-Gas Boilers (AREA)
  • Regulation And Control Of Combustion (AREA)

Abstract

L'invention concerne un système de sortie d'un taux de réduction de combustible destiné à calculer un taux de réduction d'un combustible affectant une mesure de réduction du combustible appliquée à un système de commande de la combustion d'une chaudière, le système de sortie du taux de réduction de combustible comprenant : une unité de détermination d'écart destinée à enregistrer l'historique des pressions de vapeur principales mesurées en tant qu'historique des pressions de vapeur principales, à calculer l'écart entre l'historique des pressions de vapeur principales et les pressions de vapeur principales mesurées, et à délivrer l'historique de la pression de vapeur principale pour laquelle l'écart est compris dans une plage prescrite en tant qu'historique de la pression de vapeur principale de commande ; une unité de calcul d'écart type destinée à calculer un écart type en fonction de l'historique de la pression de vapeur principale de commande délivré par l'unité de détermination d'écart ; et une unité de sortie de taux de réduction de combustible destinée à calculer un taux d'amélioration de l'écart type en fonction de l'écart type calculé par l'unité de calcul d'écart type et destinée à calculer et à délivrer le taux de réduction de combustible en fonction d'une équation de référence indiquant la relation entre le taux d'amélioration de l'écart type et le taux de réduction de combustible.
PCT/JP2018/019302 2017-06-09 2018-05-18 Système, procédé et programme de sortie de taux de réduction de combustible WO2018225481A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AU2018280740A AU2018280740B2 (en) 2017-06-09 2018-05-18 Fuel reduction rate output system, fuel reduction rate output method, and fuel reduction rate output program
CN201880037976.2A CN110832251B (zh) 2017-06-09 2018-05-18 燃料削减率输出系统、燃料削减率输出方法以及存储介质
KR1020197036400A KR102469420B1 (ko) 2017-06-09 2018-05-18 연료 삭감율 출력 시스템, 연료 삭감율 출력 방법 및 연료 삭감율 출력 프로그램

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JP2017-114679 2017-06-09
JP2017114679A JP6715800B2 (ja) 2017-06-09 2017-06-09 燃料削減率出力システム、燃料削減率出力方法、および燃料削減率出力プログラム

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KR (1) KR102469420B1 (fr)
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AU (1) AU2018280740B2 (fr)
TW (1) TWI682126B (fr)
WO (1) WO2018225481A1 (fr)

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CN110925741A (zh) * 2019-12-13 2020-03-27 吉林大学 一种基于减温水量的主蒸汽各过热器进出口温度获取方法

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WO2022054193A1 (fr) * 2020-09-10 2022-03-17 郵船商事株式会社 Système et procédé de commande de combustion de chaudière
CN113915601A (zh) * 2021-09-09 2022-01-11 中国五环工程有限公司 燃油燃气锅炉空燃比自动控制系统及控制方法

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CN110925741A (zh) * 2019-12-13 2020-03-27 吉林大学 一种基于减温水量的主蒸汽各过热器进出口温度获取方法
CN110925741B (zh) * 2019-12-13 2021-03-26 吉林大学 一种基于减温水量的主蒸汽各过热器进出口温度获取方法

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KR102469420B1 (ko) 2022-11-22
JP6715800B2 (ja) 2020-07-01
CN110832251A (zh) 2020-02-21
TWI682126B (zh) 2020-01-11
KR20200030504A (ko) 2020-03-20
CN110832251B (zh) 2021-08-31
TW201903548A (zh) 2019-01-16
AU2018280740B2 (en) 2023-05-25
AU2018280740A1 (en) 2020-01-16
JP2019002574A (ja) 2019-01-10

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