JP2002235921A - Boiler - Google Patents
BoilerInfo
- Publication number
- JP2002235921A JP2002235921A JP2001031188A JP2001031188A JP2002235921A JP 2002235921 A JP2002235921 A JP 2002235921A JP 2001031188 A JP2001031188 A JP 2001031188A JP 2001031188 A JP2001031188 A JP 2001031188A JP 2002235921 A JP2002235921 A JP 2002235921A
- Authority
- JP
- Japan
- Prior art keywords
- air
- boiler
- inlet
- air flow
- flow rate
- 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.)
- Pending
Links
Classifications
-
- 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
- Air Supply (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、複数の空気予熱器
(以下、AH(Air Heater)と称す)を有し
且つ押込通風機(以下、FDFと称す)を1基で構成す
るボイラ装置の煙風道系統に係わり、特に複数のAHの
うち、どのAHが最も灰などの付着による詰まりが多い
かを特定する方法に好適に利用できるものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a boiler apparatus having a plurality of air preheaters (hereinafter, referred to as AHs (Air Heaters)) and one push-in ventilator (hereinafter, referred to as FDF). The present invention relates to a flue duct system, and can be suitably used particularly for a method of specifying which AH among a plurality of AHs is most frequently clogged due to adhesion of ash or the like.
【0002】本発明で取り扱うAHは、再生式熱交換型
AH(回転式空気予熱型AH)であって、予熱空気と排
ガスとが完全分離している型式のAHを対象とするもの
ではない。The AH handled in the present invention is a regenerative heat exchange type AH (rotary air preheating type AH), and is not intended for an AH in which preheated air and exhaust gas are completely separated.
【0003】[0003]
【従来の技術】AHの内部構造物であるエレメントは燃
焼灰などの付着によリガス(燃焼排ガス)及び空気流通
部(予熱空気の加熱部)に詰まりを発生し、AHの入口
ダクトと出口ダクトの圧力差を増加させ、FDF吐出庄
の上昇、誘引送風機(lDF)を有する場合はlDF運
転差庄を増加させる。2. Description of the Related Art An element which is an internal structure of an AH is clogged in a regas (combustion exhaust gas) and an air circulation portion (a heating portion of preheated air) due to adhesion of combustion ash and the like, and an inlet duct and an outlet duct of the AH are generated. The pressure difference is increased, and the FDF discharge pressure rises. If the air blower (IDF) is provided, the IDF operation pressure is increased.
【0004】ボイラ運転継続のためには、これら空気及
びガスの系統の圧力損失の増加を、FDFやIDFの吐
出能力以内に留める必要があるため、AHのガス入口ダ
クトとガス出口ダクトの圧力差がある値以上になるとA
Hエレメントの洗浄を行い、圧力差の低減を行う必要が
ある。In order to continue the operation of the boiler, it is necessary to keep the increase in the pressure loss of the air and gas systems within the discharge capacity of the FDF or IDF. Therefore, the pressure difference between the gas inlet duct and the gas outlet duct of the AH is required. When a certain value is exceeded, A
It is necessary to clean the H element and reduce the pressure difference.
【0005】従来のAHエレメント部の詰まりを検出す
る方法としては、例えば図2に示されるようなものがあ
る。即ち従来は、AH3のガス入口ダクトとガス出口ダ
クトの差庄の上昇分をAHガス側差圧検出器10で検出
することによってAHエレメント部の詰まりを検出する
方法をとっている。[0005] As a conventional method for detecting clogging of the AH element portion, for example, there is a method shown in FIG. That is, in the related art, the clogging of the AH element portion is detected by detecting the rise of the difference between the gas inlet duct and the gas outlet duct of the AH 3 by the AH gas side differential pressure detector 10.
【0006】また、従来技術では、ボイラでの燃焼や性
能管理に必要な火炉入口燃焼空気のみを把握し、AH二
次入口空気流量検出は設置していない。これは、AHが
複数設置となるような場合はFDFも同数設置し、各系
列の空気流量およびガス流量は均等になるように、ある
いはそれぞれの流量を把握して運転するのが一般的であ
った。即ち、従来技術では、図2に示すように予熱空気
の1系列毎に押込通風機1を設け、予熱空気の火炉入口
に二次空気流量検出器12を設けて前記検出器からの検
出流量でボイラの燃焼管理を実施していた。二次空気流
量検出器12はボイラ燃焼管理に用いられていた。In the prior art, only the furnace inlet combustion air required for combustion and performance management in the boiler is grasped, and no AH secondary inlet air flow rate detection is provided. In general, when a plurality of AHs are installed, the same number of FDFs are installed, and the air flow and the gas flow of each system are generally equalized, or the operation is performed by grasping each flow. Was. That is, in the prior art, as shown in FIG. 2, a forced air ventilator 1 is provided for each line of preheated air, and a secondary air flow rate detector 12 is provided at a furnace inlet of the preheated air, and the detected flow rate from the detector is determined. Boiler combustion management was implemented. The secondary air flow detector 12 was used for boiler combustion management.
【0007】また、電力規制緩和によリIPP(Ind
ependent Power Producer)プ
ラントとしてのボイラ装置が求められ、電力の卸、ある
いは製鉄業などへの供給など、小規模ながら定格電気出
力の安定供給が要求されるボイラ装置の系統構成が必要
となり、運転継続中に清掃が必要なAHのみを複数設置
するようになった(1つのFDFに対して1つのAHで
はなくて複数のAH設置)。即ち、電力の安定供給のた
めに、AHエレメントに詰まりが発生した場合に当該系
統を完全に停止してエレメントを洗浄するのではなく
て、片肺運転してでも常時電力の安定供給できるように
AHを2つ以上設置している。ここで、洗浄が必要なA
Hを停止しても詰まりの未だ発生していない他のAHで
片肺運転を行えるのである。[0007] In addition, IPP (Ind
Boiler equipment as an independent Power Producer (plant) plant is required, and the system configuration of a boiler equipment that requires a stable supply of rated electrical output in a small scale, such as wholesale power supply or supply to the steel industry, is required. Only a plurality of AHs that need to be cleaned are now installed (a plurality of AHs instead of one AH for one FDF). That is, in order to stably supply electric power, instead of completely stopping the AH element and cleaning the element when the AH element becomes clogged, the power can always be stably supplied even in one-lung operation. Two or more AHs are installed. Here, A which needs cleaning
Even if H is stopped, one-lung operation can be performed with another AH in which clogging has not yet occurred.
【0008】[0008]
【発明が解決しようとする課題】従来技術における、1
系列毎にFDF、AHを備えたボイラ装置の場合、各A
Hの通過空気流量は、それぞれのFDFから供給される
空気流量として把握できており、また、各AHの通過空
気流量が等しい場合、個々のAHエレメントヘの灰付着
による詰まり度合いが違えば各AHの空気あるいはガス
入口出口の圧力差が異なるため、これを図2のようにA
Hガス側差圧検出器10で検出すれば、その差圧の最も
高いAHが、最も灰付着による詰まりが多いと特定でき
る。SUMMARY OF THE INVENTION In the prior art, 1
In the case of a boiler device equipped with FDF and AH for each
The passing air flow rate of H can be grasped as the flow rate of air supplied from each FDF, and when the passing air flow rate of each AH is equal, if the degree of clogging due to ash adhesion to each AH element is different, each AH Since the pressure difference between the air and gas inlet / outlet ports differs from that in FIG.
If detected by the H gas side differential pressure detector 10, it can be specified that AH having the highest differential pressure has the largest amount of clogging due to ash adhesion.
【0009】一方、2つのAHを有し且つFDFを一基
で構成するボイラ装置の場合、AH空気入口ダクトは当
然のことながら1系列から分岐し2系列となり、各AH
に接続する。またAH空気出口ダクトは、各AHを出た
後合流する。このため、AHの詰まり度合いが異なって
いても、各AHを通過する空気流量の比率が変わってバ
ランスした状態となり、各AHの入口出口圧力差は同一
の値となってしまって、前記圧力差では詰まりの検出が
できない。On the other hand, in the case of a boiler apparatus having two AHs and one FDF, the AH air inlet duct naturally branches from one line to form two lines,
Connect to The AH air outlet ducts merge after leaving each AH. For this reason, even if the degree of clogging of the AHs is different, the ratio of the air flow passing through each AH is changed to be in a balanced state, and the inlet / outlet pressure difference of each AH becomes the same value, and the pressure difference Cannot detect clogging.
【0010】また、IDFが1基である、またはlDF
を持たず1系列となり集合し煙突に接続するような場
合、ガス側についても空気側と同様にガス流量比率が変
わってバランスして、上述と同様にAHでのガス圧力差
では詰まりの検出ができない。In addition, the number of IDFs is one, or
In the case where the gas flow rate ratio changes on the gas side as in the case of the air side and balances, the clogging is detected by the gas pressure difference in the AH as described above. Can not.
【0011】また、AHエレメントの詰まり度合いが多
いと空気流量とガス流量が同様に少なくが、AHでの熱
交換量は低下しているので、AHの入口や出口の空気又
はガス温度は詰まりの程度によって見かけ上ほとんど変
わらない。従って温度特性からはAH詰まり度合いは把
握しにくい。When the degree of clogging of the AH element is high, the air flow rate and the gas flow rate are similarly low, but the heat exchange amount at the AH is low. There is almost no apparent change depending on the degree. Therefore, it is difficult to grasp the degree of AH clogging from the temperature characteristics.
【0012】そこで、本発明は、各AHのガス入口ダク
ト、ガス出口ダクトのそれぞれが集合し1系列となる場
合においても、複数のAHのうち、いずれのAHが、詰
まり度合いが最大となっているかをAH圧力差測定器を
用いずに特定することを目的としている。また、AHが
2機の場合に詰まり検出器の員数を少なくすることを目
的としている。In view of the above, according to the present invention, even when the gas inlet duct and the gas outlet duct of each AH are gathered to form a single system, any one of the plurality of AHs has the highest degree of clogging. It is intended to specify whether or not the AH pressure difference measuring device is used. Another object is to reduce the number of clogging detectors when the number of AHs is two.
【0013】[0013]
【課題を解決するための手段】前記課題を解決するため
に、本発明は次のような構成を採用する。押込通風機を
1基有し且つボイラ入口で1系列の風道を有するボイラ
装置であって、前記押込通風機と前記ボイラ入口との間
に空気予熱器のそれぞれ設置された複数系列を設け、各
空気予熱器の空気入口側又は空気出口側に空気流量検出
器を設け、前記各空気流量検出器で検出される空気流量
の差に基づいて各空気予熱器の詰まりの程度を判断する
ボイラ装置。In order to solve the above problems, the present invention employs the following configuration. A boiler apparatus having one forced draft fan and having one series of air passages at a boiler inlet, wherein a plurality of series of air preheaters are provided between the forced draft fan and the boiler inlet, respectively. A boiler device provided with an air flow detector on the air inlet side or the air outlet side of each air preheater, and judging the degree of clogging of each air preheater based on the difference in air flow detected by each air flow detector .
【0014】また、押込通風機を1基有し且つボイラ入
口で1系列の風道を有するボイラ装置であって、前記押
込通風機と前記ボイラ入口との間に空気予熱器のそれぞ
れ設置された2系列を設け、前記2系列の一方の空気予
熱器の空気入口側又は空気出口側に唯一の空気流量検出
器を設け、前記唯一の空気流量検出器で検出される空気
流量と2つの空気予熱器の合計空気流量とに基づいて2
つの空気予熱器の詰まりの程度を判断するボイラ装置。A boiler apparatus having one forced draft fan and one series of air passages at the boiler inlet, wherein air preheaters are respectively installed between the forced draft fan and the boiler inlet. Two lines are provided, and only one air flow detector is provided on the air inlet side or the air outlet side of one air preheater of the two lines, and the air flow detected by the only air flow detector and two air preheats are provided. 2 based on the total air flow of the vessel
Boiler device that determines the degree of clogging of two air preheaters.
【0015】[0015]
【発明の実施の形態】本発明の実施形態に係るボイラ装
置について図1を用いて以下説明する。図1は本発明の
実施形態に係るボイラ装置の具体的構成を示す図であ
り、1は押込通風機、2はAH二次空気入口タンパ、3
は空気予熱器(AH)、4はAH二次空気出口タンパ、
5は炉、6はAHガス入口タンパ、7はAHガス出口ダ
ンパ、8はAHバイパスダンパ、9は誘引通風機(ID
F)、AHガス側差庄検出器10、AH入口二次空気流
量検出器、12は火炉入口二次空気流量検出器、をそれ
ぞれ表す。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A boiler device according to an embodiment of the present invention will be described below with reference to FIG. FIG. 1 is a diagram showing a specific configuration of a boiler device according to an embodiment of the present invention, where 1 is a forced draft fan, 2 is an AH secondary air inlet tamper,
Is an air preheater (AH), 4 is an AH secondary air outlet tamper,
5 is a furnace, 6 is an AH gas inlet tamper, 7 is an AH gas outlet damper, 8 is an AH bypass damper, and 9 is an induction ventilator (ID
F), AH gas side differential detector 10, AH inlet secondary air flow detector, 12 represents furnace inlet secondary air flow detector.
【0016】本発明の実施形態の特徴は、各AH3それ
ぞれの二次空気入口側に二次空気流量検出器11を設置
し、各AH3に流入する二次空気流量を検出できるよう
にする。そして、それぞれの検出された流量の差によ
り、2つの系列の詰まり具合の差異を判断することがで
きる。本実施形態を示す図1では、1つのFDFで1つ
の火炉入口における2つのAHを設置したボイラ構成を
例示しているが、2つのAHに限らずに複数のAHを設
置してそれぞれのAH入口二次空気流量を順次比較する
ことで、それぞれのAHでの詰まりの程度を検出するこ
とができる。A feature of the embodiment of the present invention is that a secondary air flow detector 11 is installed at the secondary air inlet side of each AH 3 so that the secondary air flow flowing into each AH 3 can be detected. Then, the difference in the degree of clogging between the two series can be determined based on the difference between the detected flow rates. FIG. 1 showing the present embodiment exemplifies a boiler configuration in which one FDF installs two AHs at one furnace entrance, but is not limited to two AHs, and a plurality of AHs are installed and each AH is installed. By sequentially comparing the inlet secondary air flow rates, it is possible to detect the degree of clogging at each AH.
【0017】次に、本発明の他の実施形態の特徴は、図
1に示す構成例において、2つのAH系列にそれぞれ二
次空気流量検出器11を設置することに代えて、一方の
AH系列にのみ二次空気流量検出器11を設置する構成
である。ここで、通常のボイラ装置の燃焼管理のために
測定されている火炉入口の二次空気流量(図1の火炉入
口二次空気流量検出器12による検出流量)又はFDF
特性から間接的に求めたボイラ全体の空気流量、すなわ
ち2系列のAHの合計の空気流量と、前記一方のAH系
列のみの二次空気流量検出器11からの検出流量と、か
ら、他方のAHの空気流量を算出することができる。従
って、一方のAHの検出流量と他方の算出流量とを比較
してAH詰まり度を検出することができる。Next, another embodiment of the present invention is characterized in that, in the configuration example shown in FIG. 1, instead of installing the secondary air flow rate detectors 11 in two AH systems, one AH system is used. The configuration is such that the secondary air flow detector 11 is installed only on Here, the secondary air flow rate at the furnace inlet (the flow rate detected by the furnace inlet secondary air flow rate detector 12 in FIG. 1) or the FDF measured for the combustion management of the normal boiler device is used.
From the air flow rate of the entire boiler indirectly obtained from the characteristics, that is, the total air flow rate of the two series of AHs, and the flow rate detected from the secondary air flow rate detector 11 of the one AH series only, Can be calculated. Therefore, the degree of AH clogging can be detected by comparing the detected flow rate of one AH with the calculated flow rate of the other.
【0018】本発明の他の実施形態ではAH入口二次空
気流量検出器の員数を少なくすることができる。In another embodiment of the present invention, the number of AH inlet secondary air flow detectors can be reduced.
【0019】以上の説明において、AHを通過する二次
空気流量検出器をAHの入口側に設置した構成例を図示
したが、AHの出口側に設置する構成も本実施形態とな
り得る(入口側と出口側での二次空気流量に殆ど差はな
いから)。In the above description, the configuration example in which the secondary air flow rate detector passing through the AH is installed on the inlet side of the AH is illustrated, but the configuration in which the secondary air flow rate detector is installed on the outlet side of the AH can also be the present embodiment (the inlet side). And there is almost no difference in the secondary air flow rate at the outlet side).
【0020】[0020]
【発明の効果】本発明のボイラ装置によれば、次のよう
な効果を奏することができる。FDFを1基とし且つボ
イラ入口で1系列の風道であっても、複数のAHのうち
いずれのAHが最も詰まりを生じているかを特定するこ
とができる(従来でのAH圧力差測定器では、いずれの
AHが最も詰まっているかが特定できないにも関わら
ず)。According to the boiler apparatus of the present invention, the following effects can be obtained. It is possible to specify which one of a plurality of AHs is the most clogged even with a single wind path at the boiler entrance using one FDF (a conventional AH pressure difference measurement device) , Although it is not possible to identify which AH is the most clogged).
【0021】また、AH入口二次空気流量検出器を2基
のAHにそれぞれ設置せずに、1基のAHに設置するの
みで、2基のうちいずれがより詰まりを生じているかを
特定できる。Further, it is possible to specify which of the two AH inlets is more clogged simply by installing the AH inlet secondary air flow detector in one AH instead of in the two AHs. .
【図1】本発明の実施形態に係るボイラ装置の煙風道を
示す図である。FIG. 1 is a diagram showing a flue duct of a boiler device according to an embodiment of the present invention.
【図2】従来技術のボイラ煙風道を示す図である。FIG. 2 is a view showing a conventional boiler flue duct.
1 押込通風機(FDF) 2 AH二次空気入口ダンパ 3 空気予熱器(AH) 4 AH二次空気出口ダンパ 5 火炉 6 AHガス入口ダンパ 7 AHガス出口ダンパ 8 AHバイパスダンパ 9 誘引通風機(IDF) 10 AHガス側差圧検出器 11 AH入口二次空気流量検出器 12 火炉入口二次空気流量検出器 REFERENCE SIGNS LIST 1 push-in ventilator (FDF) 2 AH secondary air inlet damper 3 air preheater (AH) 4 AH secondary air outlet damper 5 furnace 6 AH gas inlet damper 7 AH gas outlet damper 8 AH bypass damper 9 induction fan (IDF) ) 10 AH gas side differential pressure detector 11 AH inlet secondary air flow detector 12 Furnace inlet secondary air flow detector
───────────────────────────────────────────────────── フロントページの続き (72)発明者 山本 恭功 広島県呉市宝町6番9号 バブコック日立 株式会社呉事業所内 Fターム(参考) 3K023 QA01 QB02 QC04 TA01 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Yasuyuki Yamamoto 6-9 Takara-cho, Kure-shi, Hiroshima Babcock Hitachi Kure Works F-term (reference) 3K023 QA01 QB02 QC04 TA01
Claims (2)
1系列の風道を有するボイラ装置であって、 前記押込通風機と前記ボイラ入口との間に空気予熱器の
それぞれ設置された複数系列を設け、 各空気予熱器の空気入口側又は空気出口側に空気流量検
出器を設け、 前記各空気流量検出器で検出される空気流量の差に基づ
いて各空気予熱器の詰まりの程度を判断することを特徴
とするボイラ装置。1. A boiler device having one forced draft fan and a series of air passages at a boiler inlet, wherein air preheaters are respectively installed between the forced draft fan and the boiler inlet. A plurality of systems are provided, an air flow detector is provided on the air inlet side or the air outlet side of each air preheater, and the degree of clogging of each air preheater is determined based on a difference in air flow detected by each air flow detector. Boiler device characterized by determining.
1系列の風道を有するボイラ装置であって、 前記押込通風機と前記ボイラ入口との間に空気予熱器の
それぞれ設置された2系列を設け、 前記2系列の一方の空気予熱器の空気入口側又は空気出
口側に唯一の空気流量検出器を設け、 前記唯一の空気流量検出器で検出される空気流量と2つ
の空気予熱器の合計空気流量とに基づいて2つの空気予
熱器の詰まりの程度を判断することを特徴とするボイラ
装置。2. A boiler apparatus having one forced draft fan and having a series of air passages at a boiler inlet, wherein air preheaters are respectively installed between the forced draft fan and the boiler inlet. Two lines are provided, and only one air flow detector is provided on the air inlet side or the air outlet side of one of the two air preheaters. The air flow detected by the only air flow detector and two air preheats are provided. A boiler device for determining a degree of clogging of two air preheaters based on a total air flow rate of the boiler.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2001031188A JP2002235921A (en) | 2001-02-07 | 2001-02-07 | Boiler |
Applications Claiming Priority (1)
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JP2001031188A JP2002235921A (en) | 2001-02-07 | 2001-02-07 | Boiler |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009002578A (en) * | 2007-06-21 | 2009-01-08 | Chugoku Electric Power Co Inc:The | Maintenance-inspection status indication device of central control panel |
CN103513291A (en) * | 2013-08-21 | 2014-01-15 | 国家电网公司 | Analysis early warning system based on air pre-heater bypass sealing air speed for air pre-heater blocking detection |
JP2015535920A (en) * | 2012-09-26 | 2015-12-17 | レール・リキード−ソシエテ・アノニム・プール・レテュード・エ・レクスプロワタシオン・デ・プロセデ・ジョルジュ・クロード | Method and system for heat recovery from products of combustion, loaded fuel heating equipment comprising the method and system |
-
2001
- 2001-02-07 JP JP2001031188A patent/JP2002235921A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009002578A (en) * | 2007-06-21 | 2009-01-08 | Chugoku Electric Power Co Inc:The | Maintenance-inspection status indication device of central control panel |
JP2015535920A (en) * | 2012-09-26 | 2015-12-17 | レール・リキード−ソシエテ・アノニム・プール・レテュード・エ・レクスプロワタシオン・デ・プロセデ・ジョルジュ・クロード | Method and system for heat recovery from products of combustion, loaded fuel heating equipment comprising the method and system |
CN103513291A (en) * | 2013-08-21 | 2014-01-15 | 国家电网公司 | Analysis early warning system based on air pre-heater bypass sealing air speed for air pre-heater blocking detection |
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