JPH01277111A - Combustion control method of coal burning boiler - Google Patents
Combustion control method of coal burning boilerInfo
- Publication number
- JPH01277111A JPH01277111A JP63107281A JP10728188A JPH01277111A JP H01277111 A JPH01277111 A JP H01277111A JP 63107281 A JP63107281 A JP 63107281A JP 10728188 A JP10728188 A JP 10728188A JP H01277111 A JPH01277111 A JP H01277111A
- Authority
- JP
- Japan
- Prior art keywords
- coal
- mill
- signal
- fuel
- temperature
- Prior art date
- Legal status (The legal status 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 status listed.)
- Granted
Links
- 239000003245 coal Substances 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims description 7
- 238000002485 combustion reaction Methods 0.000 title description 2
- 239000000446 fuel Substances 0.000 claims abstract description 25
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N1/00—Regulating fuel supply
- F23N1/002—Regulating fuel supply using electronic means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2221/00—Pretreatment or prehandling
- F23N2221/10—Analysing fuel properties, e.g. density, calorific
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2225/00—Measuring
- F23N2225/04—Measuring pressure
- F23N2225/06—Measuring pressure for determining flow
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Regulation And Control Of Combustion (AREA)
- Feeding And Controlling Fuel (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は石炭性状の変化に対応し得る石炭焚ボイラの燃
料制御方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a fuel control method for a coal-fired boiler that can respond to changes in coal properties.
［従来の技術］
第３図は従来の石炭焚ボイラの燃料制御方式を示すもの
で、燃料流量は負荷のみに対するプログラムによって制
御している。即ち、負荷指令（発電機出力指令）■を関
数発生器２を介して引算器３に人力して、給炭機の給炭
量１２等からの燃＄４！ｉ（給炭ｉｔ）信号４と引算し
、その差が零になるようにＰＩコントローラ５を介して
ボイラに微粉炭燃料を供給する微粉炭ミルの人ロダンバ
等の制御を行うようにしている。[Prior Art] Fig. 3 shows a conventional fuel control system for a coal-fired boiler, in which the fuel flow rate is controlled by a program for only the load. That is, by manually inputting the load command (generator output command) ■ to the subtracter 3 via the function generator 2, the amount of fuel from the coal feed amount 12 etc. of the coal feeder is $4! i (coal feeding it) signal 4 is subtracted, and the pulverized coal mill's human loader, etc., which supplies pulverized coal fuel to the boiler via the PI controller 5 is controlled so that the difference becomes zero. .
［発明が解決しようとする課題］
しかし、石炭焚ボイラへ供給する石炭は、同一産地の石
炭でも性状が変化し、又同一種の石炭でも雨水の影響な
どによって経時的に大きくその燃焼特性に差異を生じる
。[Problem to be solved by the invention] However, the properties of the coal supplied to a coal-fired boiler change even if the coal is from the same production area, and even the same type of coal can have significant differences in its combustion characteristics over time due to the influence of rainwater, etc. occurs.
これに対して、従来、石炭性状に基づいた補正を行って
おらず、このためにボイラ出口圧力や温度が不安定に変
動し、制御性が悪化する問題を有していた。On the other hand, in the past, no correction was made based on coal properties, which caused the boiler outlet pressure and temperature to fluctuate unstably, resulting in poor controllability.
本発明は、石炭性状の変化をミル廻りの状態の変化によ
って推定して燃料流量の補正を行うことにより、ボイラ
の制御性の向上を図ることを目的としている。An object of the present invention is to improve the controllability of a boiler by estimating changes in coal properties based on changes in conditions around the mill and correcting the fuel flow rate.
［課題を解決するための手段］
本発明は、上記技術的課題を解決しようとしたもので、
微粉炭ミルの出口温度を一定に保持する如くミルに供給
する空気の温度を制御している該ミル入口空気の温度を
検出し、該ミル入゛口空気温度と、ミル入口空気流量及
び給炭量から石炭性状（湿分、発熱量等）を推定し、該
推定した石炭性状に基づいて燃料流量を補正することを
特徴とする石炭焚ボイラの燃料制御方法、に係るもので
ある。[Means for Solving the Problems] The present invention attempts to solve the above technical problems, and
The temperature of the air supplied to the mill is controlled so as to maintain the outlet temperature of the pulverized coal mill constant.The temperature of the mill inlet air is detected, and the mill inlet air temperature, mill inlet air flow rate, and coal supply are controlled. The present invention relates to a fuel control method for a coal-fired boiler, characterized in that coal properties (moisture, calorific value, etc.) are estimated from the amount of coal, and the fuel flow rate is corrected based on the estimated coal properties.
［作 用］
従って、本発明では、ミル入口空気流量及び給炭量並び
にミル入口空気温度が変動することにより石炭性状（湿
分、発熱量等）の変化を推定して、燃料流量を補正する
。[Function] Therefore, in the present invention, the fuel flow rate is corrected by estimating changes in coal properties (moisture, calorific value, etc.) due to changes in the mill inlet air flow rate, coal feeding amount, and mill inlet air temperature. .
［実 施 例〕 以下本発明の実施例を図面を参照しつつ説明する。[Example〕 Embodiments of the present invention will be described below with reference to the drawings.
第１図は本発明の方法を実施する制御系統、第２図は微
粉炭ミルの一例を示し、第１図中前記第３図と同一符号
を付したものは同一物を表わしている。FIG. 1 shows a control system for implementing the method of the present invention, and FIG. 2 shows an example of a pulverized coal mill. In FIG. 1, the same reference numerals as in FIG. 3 represent the same parts.
第２図は微粉炭ミル８の一例を示すもので、給炭機７か
らの原炭をミル６に投入して粉砕し、空気供給管８を介
して供給される一次空気（熱空気）により前記粉砕され
た微粉炭を微粉炭管９を介してボイラのバーナに供給す
るようにしている。FIG. 2 shows an example of a pulverized coal mill 8. Raw coal from a coal feeder 7 is fed into the mill 6 and pulverized, and primary air (hot air) supplied through an air supply pipe 8 is used to The pulverized pulverized coal is supplied to a burner of a boiler via a pulverized coal pipe 9.
又、前記空気供給管８及び微粉炭管９に温度計１０．１
１を設けてミル６出側の微粉出口温度が一定（例えば６
５℃）に保持されるようにミル６に供給する熱空気の温
度を自動調整し、又熱空気流量がボイラの負荷（給炭量
１２からの給炭量）に対応して制御されているかどうか
、空気供給管８に設けた流量計１３の検出値によって調
整されるようになっている。Further, a thermometer 10.1 is installed in the air supply pipe 8 and the pulverized coal pipe 9.
1 to keep the fine powder outlet temperature on the mill 6 outlet constant (for example, 6
Is the temperature of the hot air supplied to the mill 6 automatically adjusted so that the temperature is maintained at 5℃), and is the hot air flow rate controlled in accordance with the boiler load (coal feed amount from coal feed amount 12)? The flow rate is adjusted based on the detected value of a flow meter 13 installed in the air supply pipe 8.
上記したように、ミル６出口の微粉の温度が一定になる
ようにミル６人口の空気温度を制御しているので、定常
状態においてミル入口空気温度が変化すれば石炭の性状
に変化があったことを推定できる。As mentioned above, the air temperature in Mill 6 is controlled so that the temperature of the fine powder at the outlet of Mill 6 is constant, so if the air temperature at the mill inlet changes in a steady state, the properties of the coal will change. It can be estimated that
このため、第１図に示すように、前記温度計ｌＯによる
ミル入口の空気温度信号１４と、流量計１３によるミル
入口の空気流量信号１５及び給炭量１２からの燃料量信
号４とを人力して石炭性状を推定し、燃料の補正量を演
算する回路１Ｂを設け、該演算回路１Ｂの補正信号１７
を前記引算器３に入力する燃料量信号４に加算器１８を
介して加算する。As shown in FIG. A circuit 1B for estimating coal properties and calculating a fuel correction amount is provided, and a correction signal 17 of the calculation circuit 1B is provided.
is added to the fuel amount signal 4 input to the subtracter 3 via an adder 18.
上記により、燃料量信号４が石炭性状に応じ １て補正
されるので、石炭性状が加味された燃料量信号４と、負
荷指令ｌを関数変換した信号とが引算器３で比較され、
その差が零になるようにＰＩコントローラ５を介してミ
ル６の制御が行われることになるので、石炭性状の変化
によるボイラ出口蒸気圧力や温度の変動を低減すること
ができる。As described above, the fuel quantity signal 4 is corrected by 1 according to the coal properties, so the fuel quantity signal 4 in which the coal properties are taken into account is compared with the signal obtained by functionally converting the load command l,
Since the mill 6 is controlled via the PI controller 5 so that the difference becomes zero, fluctuations in steam pressure and temperature at the boiler outlet due to changes in coal properties can be reduced.
尚、本発明は上記実施例にのみ限定されるものではなく
、本発明の要旨を逸脱しない範囲内において種々変更を
加え得る。Note that the present invention is not limited to the above embodiments, and various changes may be made without departing from the gist of the present invention.
［発明の効果］
上記したように、本発明の石炭焚ボイラの燃料制御方法
によれば、石炭焚ボイラに供給する微粉炭燃料を、石炭
の性状に対応して補正するようにしているので、石炭性
状が変化した場合にも適正な燃料流量をボイラに供給す
ることができ、よってボイラ出口蒸気圧力、温度の変動
を減少して、制御性の向上を図ることができる優れた効
果を奏し得る。[Effects of the Invention] As described above, according to the fuel control method for a coal-fired boiler of the present invention, the pulverized coal fuel supplied to the coal-fired boiler is corrected in accordance with the properties of the coal. Even when the coal properties change, an appropriate fuel flow rate can be supplied to the boiler, which has the excellent effect of reducing fluctuations in steam pressure and temperature at the boiler outlet and improving controllability. .
第１図は本発明の方法を実施す唇制御系統の説明図、第
２図は微粉炭ミルの説明図、第３図は従来方式の制御系
統の説明図である。
ｌは負荷指令、３は引算器、４は燃料量信号、５はＰＩ
コントローラ、６は微粉炭ミル、７は給炭機、ｔｏ、ｔ
ｔは温度計、１２は給炭量、１３は流量計、１６は演算
回路、１８は加算器を示す。FIG. 1 is an explanatory diagram of a lip control system that implements the method of the present invention, FIG. 2 is an explanatory diagram of a pulverized coal mill, and FIG. 3 is an explanatory diagram of a conventional control system. l is load command, 3 is subtractor, 4 is fuel amount signal, 5 is PI
Controller, 6 is pulverized coal mill, 7 is coal feeder, to, t
t is a thermometer, 12 is a coal supply amount, 13 is a flow meter, 16 is an arithmetic circuit, and 18 is an adder.
Claims (1)
供給する空気の温度を制御している該ミル入口空気の温
度を検出し、該ミル入口空気温度と、ミル入口空気流量
及び給炭量から石炭性状（湿分、発熱量等）を推定し、
該推定した石炭性状に基づいて燃料流量を補正すること
を特徴とする石炭焚ボイラの燃料制御方法。1) Detect the temperature of the mill inlet air that controls the temperature of the air supplied to the mill so as to keep the outlet temperature of the pulverized coal mill constant, and measure the mill inlet air temperature, mill inlet air flow rate, and coal supply. Estimate coal properties (moisture, calorific value, etc.) from the amount,
A fuel control method for a coal-fired boiler, comprising correcting a fuel flow rate based on the estimated coal properties.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63107281A JP2749588B2 (en) | 1988-04-28 | 1988-04-28 | Fuel control method for coal-fired boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63107281A JP2749588B2 (en) | 1988-04-28 | 1988-04-28 | Fuel control method for coal-fired boiler |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01277111A true JPH01277111A (en) | 1989-11-07 |
| JP2749588B2 JP2749588B2 (en) | 1998-05-13 |
Family
ID=14455097
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63107281A Expired - Lifetime JP2749588B2 (en) | 1988-04-28 | 1988-04-28 | Fuel control method for coal-fired boiler |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2749588B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109539300A (en) * | 2018-09-28 | 2019-03-29 | 国网新疆电力有限公司电力科学研究院 | A kind of the primary air velocity adjusting method and dedicated coal pulverizer of boiler peak regulation |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5131973A (en) * | 1974-09-12 | 1976-03-18 | Aida Eng Ltd | Nc nyoru katasentakusochi |
| JPS5376432A (en) * | 1976-12-17 | 1978-07-06 | Hitachi Ltd | Coal combustion apparatus |
| JPS60196135U (en) * | 1984-06-01 | 1985-12-27 | バブコツク日立株式会社 | Primary air temperature control device for mills |
-
1988
- 1988-04-28 JP JP63107281A patent/JP2749588B2/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5131973A (en) * | 1974-09-12 | 1976-03-18 | Aida Eng Ltd | Nc nyoru katasentakusochi |
| JPS5376432A (en) * | 1976-12-17 | 1978-07-06 | Hitachi Ltd | Coal combustion apparatus |
| JPS60196135U (en) * | 1984-06-01 | 1985-12-27 | バブコツク日立株式会社 | Primary air temperature control device for mills |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109539300A (en) * | 2018-09-28 | 2019-03-29 | 国网新疆电力有限公司电力科学研究院 | A kind of the primary air velocity adjusting method and dedicated coal pulverizer of boiler peak regulation |
| CN109539300B (en) * | 2018-09-28 | 2023-09-01 | 国网新疆电力有限公司电力科学研究院 | Primary air speed adjusting method for boiler peak regulation and special coal mill |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2749588B2 (en) | 1998-05-13 |
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