JPS6146730B2 - - Google Patents
Info
- Publication number
- JPS6146730B2 JPS6146730B2 JP58204686A JP20468683A JPS6146730B2 JP S6146730 B2 JPS6146730 B2 JP S6146730B2 JP 58204686 A JP58204686 A JP 58204686A JP 20468683 A JP20468683 A JP 20468683A JP S6146730 B2 JPS6146730 B2 JP S6146730B2
- Authority
- JP
- Japan
- Prior art keywords
- air
- exhaust gas
- boiler
- oxygen concentration
- air preheater
- 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.)
- Expired
Links
- 229910052760 oxygen Inorganic materials 0.000 claims description 27
- 239000001301 oxygen Substances 0.000 claims description 26
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 25
- 239000007789 gas Substances 0.000 claims description 24
- 238000002485 combustion reaction Methods 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 8
- 238000001514 detection method Methods 0.000 claims description 4
- 238000012544 monitoring process Methods 0.000 claims description 4
- 238000011109 contamination Methods 0.000 claims description 3
- 238000011084 recovery Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 7
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 238000012937 correction Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 150000002926 oxygen Chemical class 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/003—Systems for controlling combustion using detectors sensitive to combustion gas properties
- F23N5/006—Systems for controlling combustion using detectors sensitive to combustion gas properties the detector being sensitive to oxygen
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2221/00—Pretreatment or prehandling
- F23N2221/08—Preheating the air
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/18—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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)
- Air Supply (AREA)
Description
【発明の詳細な説明】
〔発明の背景〕
従来、空気予熱器からの燃焼用空気の漏洩量を
検出する手段が無く、ボイラや空気予熱器の性能
管理に支障をきたしていた。また、空気予熱器の
汚れは空気予熱器の前後差圧を検出して汚れを判
断する方法もとられているが、微差圧である上に
安定性が悪かつた。DETAILED DESCRIPTION OF THE INVENTION [Background of the Invention] Conventionally, there has been no means for detecting the amount of combustion air leaking from an air preheater, which has caused problems in managing the performance of boilers and air preheaters. In addition, a method has been used to detect contamination of the air preheater by detecting the pressure difference across the air preheater, but the pressure difference is small and the stability is poor.
本発明の目的は空気予熱器からの空気量を精度
よく安定に検出することによりボイラや空気予熱
器の性能管理用のデータを提供し、空気予熱器の
汚れを検知するためのデータとして有効な方法を
提供するにある。
The purpose of the present invention is to provide data for performance management of boilers and air preheaters by accurately and stably detecting the amount of air from the air preheater, and to provide data that is effective as data for detecting dirt in the air preheater. We are here to provide you with a method.
第１図に本発明のボイラまわりの燃焼用空気と
ボイラ排ガスの概略系統図を示す。押込フアン３
で昇圧された空気は、空気予熱器６でボイラ排ガ
スと熱交換してボイラ入口風道ダクト７を経てボ
イラ８へ送られる。ボイラで燃焼に使われた空気
はボイラ排ガスとして、ボイラ出口煙道ダクト９
を通り、空気予熱器６を通つて空気予熱器煙道ダ
クト１０から煙突へ排出される。ここで、空気予
熱器６において空気予熱器６入口風道ダクトから
の空気が煙道ダクト１０側へ10パーセント前後の
漏洩があり、ボイラ効率低下の原因になつてい
る。また、ボイラの排ガスにより空気予熱器６が
汚れるため、空気予熱器の熱交換効率が低下し、
汚れ除去装置を作動させるが、この汚れに応じて
空気の漏洩量が変化することを検出して、汚れ除
去装置の作動を制御することは有効な手段と考え
られる。
FIG. 1 shows a schematic system diagram of combustion air and boiler exhaust gas around the boiler of the present invention. Push fan 3
The pressurized air exchanges heat with the boiler exhaust gas in the air preheater 6 and is sent to the boiler 8 via the boiler inlet air duct 7. The air used for combustion in the boiler is passed through the boiler outlet flue duct 9 as boiler exhaust gas.
through the air preheater 6 and is discharged from the air preheater flue duct 10 to the chimney. Here, in the air preheater 6, about 10% of the air from the air duct at the inlet of the air preheater 6 leaks to the flue duct 10 side, causing a decrease in boiler efficiency. In addition, the air preheater 6 becomes dirty due to boiler exhaust gas, which reduces the heat exchange efficiency of the air preheater.
Although the dirt removal device is operated, it is considered an effective means to control the operation of the dirt removal device by detecting that the amount of air leakage changes depending on the dirt.
本発明はこの空気の漏洩量を検出する方式を提
供し、ボイラと空気予熱器の性能の管理データを
得ることを１つの目的としている。この漏洩量を
検出するために、ボイラ出口の排ガス酸素濃度検
出器１、空気予熱器の出口酸素濃度検出器２、お
よび、空気流量検出器４を設置してこれらの量を
演算して容易に漏洩量を求める手段を以下に説明
する。空気流量検出器４は押込フアン３の入口や
空気予熱器５の入口風道ダクトに設置されること
もあるが、補正を加えることで容易に本発明の原
理を適用することができるので、ここでは簡単の
ため、第１図の位置のもので説明する。 One object of the present invention is to provide a method for detecting the amount of air leakage, and to obtain management data on the performance of the boiler and air preheater. In order to detect this leakage amount, an exhaust gas oxygen concentration detector 1 at the boiler outlet, an air preheater outlet oxygen concentration detector 2, and an air flow rate detector 4 are installed, and these quantities can be easily calculated. The means for determining the amount of leakage will be explained below. Although the air flow rate detector 4 may be installed at the inlet of the forced fan 3 or the inlet air duct of the air preheater 5, the principle of the present invention can be easily applied by making corrections, so it will not be described here. For the sake of simplicity, the explanation will be based on the position shown in FIG.
第２図は本発明の原理を説明するための系統図
を示す。空気予熱器入口風道ダクト５における空
気流量をＦA、酸素濃度をＯAとする。９ボイラ出
口煙道ダクトにおけるガス流量、酸素濃度を各各
ＦG、ＯG、空気予熱器６における空気漏洩量をＦ
Lとすると空気予熱器出口煙道ダクト１０におけ
るガス流量はＦG＋ＦLとなり、この酸素濃度をＯ
Hとする。 FIG. 2 shows a system diagram for explaining the principle of the present invention. Let F A be the air flow rate in the air preheater inlet air duct 5, and O A be the oxygen concentration. 9 The gas flow rate and oxygen concentration in the boiler outlet flue duct are each F G and O G , and the air leakage amount in the air preheater 6 is F
L , the gas flow rate in the air preheater outlet flue duct 10 is F G +F L , and this oxygen concentration is O
Let it be H.
この様にすると、空気予熱器出口ダクト１０に
おける酸素量はＦL×ＯA＋ＦG×ＯGとなる。ガス
量はＦG＋ＦLであるのでこの比がこの煙道ダクト
における酸素濃度ＯHとなる。 In this way, the amount of oxygen in the air preheater outlet duct 10 becomes F L ×O A +F G ×O G. Since the gas amount is F G +F L , this ratio becomes the oxygen concentration O H in this flue duct.
すなわち、
ＦＬＯＡ＋ＦＧＯＧ／ＦＧ＋ＦＬ＝ＯH……………(
1)
(1)式を空気漏洩量ＦLについて解けば、
ＦL＝ＯＨ−ＯＧ／ＯＡ−ＯＨＦG ……………(2)
ＯAは空気中の酸素濃度で一定（21％）である
ので、ＯH、ＯGおよびＦGが判れば空気漏洩量ＦL
が求まる。排ガス流量ＦG測定装置を設置しても
良いが、一般には、空気流量測定装置が設置され
ているのでこれを使用しても精度上問題となるこ
とは無い。一般に、ボイラでの燃焼により定常状
態では
ＦG＝αＦA（αは一定） ……………(3)
の関係が成り立つので、これを(2)式に代入すると
ＦL＝ＯＨ−ＯＧ／ＯＡ−ＯＨαＦA ……………(4)
で空気漏洩量を検出することができる。 That is, F L O A + F G O G / F G + F L = O H ……………(
1) If equation (1) is solved for the air leakage amount F L , F L = O H − O G / O A − O H F G ……………(2) O A is constant depending on the oxygen concentration in the air. (21%), so if O H , O G and F G are known, the air leakage amount F L
is found. Although an exhaust gas flow rate measuring device may be installed, since an air flow rate measuring device is generally installed, there is no problem in terms of accuracy even if this is used. Generally, in steady state due to combustion in a boiler, the following relationship holds true: F G = αF A (α is constant) ……………(3), so by substituting this into equation (2), we get F L = O H −O The amount of air leakage can be detected by G /O A -O H αF A (4).
この空気漏洩量をボイラおよび空気予熱器の性
能管理データとして指示計あるいは計算機等によ
る監視に使用することができる。 This amount of air leakage can be used as performance management data for the boiler and air preheater for monitoring using an indicator, a computer, or the like.
第３図に上記で得られた空気漏洩量を使つた、
空気予熱器６の汚れ除去装置の制御方式の一例を
示す。空気漏洩量演算器１１で求めた漏洩量と、
負荷検出器１２で検出した負荷、あるいは、空気
量、燃料量その他の信号により、関数発生器１３
で空気漏洩量の規定値を定め、この値を超えたと
き空気予熱器が汚れたというとを判定して、空気
予熱器汚れ除去装置１５の起動、停止その他の制
御を効率良く行なうことができる。なお、図中１
４は信号検出器である。 Figure 3 shows the air leakage amount obtained above.
An example of a control system for the dirt removal device of the air preheater 6 is shown. The leakage amount calculated by the air leakage amount calculator 11,
The function generator 13 is activated by the load detected by the load detector 12, or by signals such as air amount, fuel amount, etc.
A predetermined value for the amount of air leakage is determined, and when this value is exceeded, it is determined that the air preheater is contaminated, and the start, stop, and other controls of the air preheater dirt removal device 15 can be performed efficiently. . In addition, 1 in the figure
4 is a signal detector.
第４図はそれぞれの酸素濃度を精度良く検出す
るための一実施例を示す。(4)式において、ＯHお
よびＯGは、一般に、数パーセントの濃度で低い
値になるので、この差を精度良く検出する必要が
ある。 FIG. 4 shows an embodiment for detecting each oxygen concentration with high accuracy. In equation (4), O H and O G generally have low values at a concentration of several percent, so it is necessary to detect this difference with high accuracy.
一般に、酸素濃度分析計はジルコニア等の材料
を高温に保つとその両側の酸素濃度の差に応じ
て、起電力が発生するという原理を利用して、一
方に規定濃度のガスを通して、他方を流れるガス
中の酸素濃度を検出するという方法がとられてい
る。 In general, oxygen concentration analyzers utilize the principle that when a material such as zirconia is kept at high temperature, an electromotive force is generated depending on the difference in oxygen concentration between the two sides. One method is to detect the oxygen concentration in the gas.
本図はこの原理を利用して、一方にボイラ出口
煙道ダクト９、他方に、空気予熱器煙道ダクト１
０のガスを誘引してこの濃度差を直接検出する原
理を示したものである。それぞれのダクトからガ
スサンプリング装置１６によりガスをサンプリン
グしこれを酸素濃度検出エレメント１８を収納し
た酸素濃度差検出装置１７に導く、このエレメン
トを一定に加熱すれば両側の酸素濃度差に応じて
起電力が発生するので、増幅器１９で増幅して、
酸素濃度演算装置２０で線形化して、酸素濃度差
を求める。この濃度差は(4)式の分子ＯH−ＯGに相
当し、この量を精度良く検出することができる。 This diagram utilizes this principle to show the boiler outlet flue duct 9 on one side and the air preheater flue duct 1 on the other.
This shows the principle of attracting zero gas and directly detecting this concentration difference. Gas is sampled from each duct by a gas sampling device 16 and guided to an oxygen concentration difference detection device 17 that houses an oxygen concentration detection element 18.If this element is heated at a constant rate, an electromotive force is generated according to the oxygen concentration difference on both sides. is generated, so it is amplified by the amplifier 19,
The oxygen concentration calculation device 20 performs linearization to determine the oxygen concentration difference. This concentration difference corresponds to the molecule O H - O G in equation (4), and this amount can be detected with high accuracy.
本発明によれば空気予熱器における燃焼用空気
の漏洩量を求めることができ、ボイラおよび空気
予熱器の性能管理が容易になり、かつ、空気予熱
器の汚れ除去装置を制御することにより空気予熱
器を高効率に保つことができる。
According to the present invention, the amount of leakage of combustion air in the air preheater can be determined, making it easier to manage the performance of the boiler and the air preheater, and by controlling the dirt removal device of the air preheater. The equipment can be kept highly efficient.
第１図は本発明の内容を説明するためのボイラ
まわりの燃焼用空気とボイラ排ガスの概略系統
図、第２図は本発明の原理を説明するための系統
図、第３図は空気予熱器汚れ除去装置の制御方式
の一実施例図、第４図は酸素濃度差を精度良く検
出するための一実施例図である。
１……ボイラ出口排ガス酸素濃度検出器、６…
…空気予熱器、９……ボイラ出口煙道ダクト、１
０……空気予熱器出口煙道ダクト、１６……ガス
サンプリング装置、１７……酸素濃度差検出装
置、１９……増幅器、２０……酸素濃度差演算装
置。
Fig. 1 is a schematic system diagram of combustion air around the boiler and boiler exhaust gas to explain the content of the present invention, Fig. 2 is a system diagram to explain the principle of the invention, and Fig. 3 is an air preheater. FIG. 4 is a diagram showing an example of a control system for a dirt removal device, and FIG. 4 is a diagram showing an example for accurately detecting a difference in oxygen concentration. 1... Boiler outlet exhaust gas oxygen concentration detector, 6...
...Air preheater, 9...Boiler outlet flue duct, 1
0...Air preheater outlet flue duct, 16...Gas sampling device, 17...Oxygen concentration difference detection device, 19...Amplifier, 20...Oxygen concentration difference calculation device.
Claims (1)
イラの通風方法において、 前記空気予熱器における燃焼用空気の排ガス側
への漏洩量を検出するために、前記ボイラの出口
排ガスの酸素濃度と前記空気予熱器の出口排ガス
中の酸素濃度および前記燃焼用空気の流量または
排ガス流量を検出することを特徴とするボイラ燃
焼空気漏洩監視方法。 ２ 特許請求の範囲第１項において、 前記燃焼用空気の漏洩量が規定値以上になつた
ことを検出して、前記空気予熱器の汚れを検出
し、汚れ除去装置を制御することを特徴とするボ
イラ燃焼空気漏洩監視方法。 ３ 特許請求の範囲第１項において、 前記ボイラの出口排ガスの酸素濃度と前記空気
予熱器の出口排ガスの酸素濃度の濃度差を検出す
るため、酸素濃度検知エレメントの両側にそれぞ
れの排ガスを通して濃度差に応じた出力信号を得
ることを特徴とするボイラ燃焼空気漏洩監視方
法。[Claims] 1. In a method for ventilating a boiler equipped with an air preheater for exhaust gas heat recovery, in order to detect the amount of combustion air leaking to the exhaust gas side in the air preheater, the outlet of the boiler A boiler combustion air leakage monitoring method comprising detecting the oxygen concentration of exhaust gas, the oxygen concentration in the exhaust gas at the outlet of the air preheater, and the flow rate of the combustion air or the exhaust gas flow rate. 2. Claim 1 is characterized in that by detecting that the amount of leakage of the combustion air has exceeded a specified value, contamination of the air preheater is detected and a contamination removal device is controlled. Method for monitoring boiler combustion air leakage. 3. In claim 1, in order to detect the concentration difference between the oxygen concentration of the outlet exhaust gas of the boiler and the oxygen concentration of the outlet exhaust gas of the air preheater, each exhaust gas is passed on both sides of an oxygen concentration detection element to detect the concentration difference. A boiler combustion air leak monitoring method characterized by obtaining an output signal according to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58204686A JPS6099929A (en) | 1983-11-02 | 1983-11-02 | Boiler combustion air leakage monitoring method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58204686A JPS6099929A (en) | 1983-11-02 | 1983-11-02 | Boiler combustion air leakage monitoring method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6099929A JPS6099929A (en) | 1985-06-03 |
| JPS6146730B2 true JPS6146730B2 (en) | 1986-10-15 |
Family
ID=16494624
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58204686A Granted JPS6099929A (en) | 1983-11-02 | 1983-11-02 | Boiler combustion air leakage monitoring method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6099929A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1995543A1 (en) * | 2007-05-10 | 2008-11-26 | AGC Flat Glass Europe SA | Heat exchanger for oxygen |
-
1983
- 1983-11-02 JP JP58204686A patent/JPS6099929A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6099929A (en) | 1985-06-03 |
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