JPS6354505A - Pulverized coal firing equipment and method of operating the same - Google Patents
Pulverized coal firing equipment and method of operating the sameInfo
- Publication number
- JPS6354505A JPS6354505A JP19823286A JP19823286A JPS6354505A JP S6354505 A JPS6354505 A JP S6354505A JP 19823286 A JP19823286 A JP 19823286A JP 19823286 A JP19823286 A JP 19823286A JP S6354505 A JPS6354505 A JP S6354505A
- Authority
- JP
- Japan
- Prior art keywords
- pulverized coal
- burner
- load
- ignition
- 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.)
- Pending
Links
- 239000003245 coal Substances 0.000 title claims abstract description 92
- 238000000034 method Methods 0.000 title claims abstract description 10
- 238000010304 firing Methods 0.000 title abstract 5
- 238000002485 combustion reaction Methods 0.000 claims abstract description 58
- 238000010438 heat treatment Methods 0.000 claims abstract description 13
- 239000002245 particle Substances 0.000 claims abstract description 4
- 239000011819 refractory material Substances 0.000 claims description 3
- 238000011017 operating method Methods 0.000 claims description 2
- 238000001514 detection method Methods 0.000 claims 1
- 239000000295 fuel oil Substances 0.000 abstract description 11
- 239000000446 fuel Substances 0.000 abstract description 9
- 239000007789 gas Substances 0.000 abstract description 6
- 239000011449 brick Substances 0.000 abstract 1
- 239000003350 kerosene Substances 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 13
- 229910052799 carbon Inorganic materials 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000010419 fine particle Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- NJYFRQQXXXRJHK-UHFFFAOYSA-N (4-aminophenyl) thiocyanate Chemical compound NC1=CC=C(SC#N)C=C1 NJYFRQQXXXRJHK-UHFFFAOYSA-N 0.000 description 1
- 241000220317 Rosa Species 0.000 description 1
- 241000221988 Russula cyanoxantha Species 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000003610 charcoal Substances 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
従来の微粉炭焚ボイラの構成を第６図に基づいて簡単に
説明する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The configuration of a conventional pulverized coal-fired boiler will be briefly described with reference to FIG.
図において、石炭バンカ１からフィダー２を介して供給
された石炭はミル３にて粉砕され、火炉４内に設置され
た微粉炭バーナ２０に導かれる。In the figure, coal supplied from a coal bunker 1 via a feeder 2 is pulverized in a mill 3 and guided to a pulverized coal burner 20 installed in a furnace 4.
Ａ／Ｈ５にはＦＤＦ６より直接あるいはＰＡＦ７を介し
て空気が供給されており、Ａ／Ｈ５Ｋよって加熱された
空気はコックを介して前記ミル３に導かれ、前記粉砕さ
れた微粉炭のキャリアとして用いられる。また火炉４か
ら排出される燃焼ガスはＡ／Ｈ５を介してＦＤＦ８へ排
出される。Air is supplied to A/H5 directly from FDF6 or via PAF7, and the air heated by A/H5K is led to the mill 3 via a cock and used as a carrier for the crushed pulverized coal. It will be done. Further, combustion gas discharged from the furnace 4 is discharged to the FDF 8 via the A/H 5.
一方重油タンク９から重油ポンプ１０．オイルヒータ１
１、重油流量調整弁１２、重油遮断弁１３を介して重油
が火炉４内に設置された重油バーナ１９に導かれる。ま
た軽油タンク１４からは軽油ポンプ１５、軽油流′ｊｉ
、調整弁１６、軽油連断弁１７を介して火炉４内の軽油
バーナ１８に導かれる。On the other hand, from the heavy oil tank 9 to the heavy oil pump 10. oil heater 1
1. Heavy oil is guided to a heavy oil burner 19 installed in the furnace 4 via a heavy oil flow rate adjustment valve 12 and a heavy oil cutoff valve 13. Also, from the light oil tank 14, a light oil pump 15, a light oil flow 'ji
, a regulating valve 16, and a light oil connection valve 17, which lead to a light oil burner 18 in the furnace 4.
このような微粉炭焚ボイラでは、直接主燃焼バーナであ
る微粉炭バーナに点火するのが困難であるため、まず軽
油バーナ１８に点火し、さらに重油バーナ１９に点火し
て、その後微粉炭バーナ２０に点火するのが一般的であ
る。また上記軽油バーナに代えてガスバーナを使用する
こともある。しかし乍らいずれの場合も油を使用するた
め、燃料費、設備費がかさむ問題がある。因みに、１０
００〔日〕当りの燃費は、例えば軽油で７．２円、重油
で５．３円、微粉炭で３．０円である。また上記ボイラ
では、ボイラ低負荷運転時に微粉炭バーナ２０の燃焼が
不安定になるため、未燃分が発生しないように１点火起
動時ではなくとも５０チ負荷以下においては、重油を助
燃する方法がとられている。In such a pulverized coal-fired boiler, it is difficult to directly ignite the pulverized coal burner, which is the main combustion burner, so the light oil burner 18 is first ignited, then the heavy oil burner 19 is ignited, and then the pulverized coal burner 20 is ignited. It is common to ignite the Moreover, a gas burner may be used instead of the above-mentioned light oil burner. However, since oil is used in either case, there is a problem in that fuel costs and equipment costs increase. By the way, 10
The fuel efficiency per 00 [days] is, for example, 7.2 yen for light oil, 5.3 yen for heavy oil, and 3.0 yen for pulverized coal. In addition, in the above boiler, the combustion of the pulverized coal burner 20 becomes unstable when the boiler is operated at low load, so in order to prevent the generation of unburned substances, there is a method of auxiliary combustion of heavy oil at a load of 50 inches or less, even if it is not at the time of 1 ignition startup. is taken.
この糧の装置として、例えば、実開昭５８−９３６２３
号公報、特開昭５６−２７８０６号公報等に記載された
技術が挙げられるが、これらはいずれも、単に助燃バー
ナの燃料を削減して、省エネルギーを図り、ボイラの低
負荷時でも微粉炭バーナの燃焼を安定に保持することを
目的としているものである。従って上記したような従来
装置に比較して多少は低負荷運転が可能になることがあ
っても、起動時の未燃分の発生に関する問題について解
決できるものに至っていない。As a device for this food, for example, Utility Model Application No. 58-93623
The techniques described in Japanese Patent Application Laid-Open No. 56-27806, etc. are examples, but all of these techniques simply reduce the amount of fuel in the auxiliary burner to save energy, and the pulverized coal burner can be used even when the boiler is under low load. The purpose is to maintain stable combustion. Therefore, although it may be possible to operate at a somewhat lower load than the conventional device as described above, it has not yet solved the problem regarding the generation of unburned substances during startup.
このように上記従来技術は、起動時及び低負荷時の未燃
分の発生の点について配慮されておらず、従来のバーナ
構造の延長線上にある。As described above, the above-mentioned conventional technology does not take into account the generation of unburned matter at startup and under low load, and is an extension of the conventional burner structure.
本発明は上記の点に鑑みてなされたものであり、その目
的は、未燃分の発生を最小限にするうえに好適な微粉炭
燃焼装置及びその運転方法を提供することにある。The present invention has been made in view of the above points, and an object of the present invention is to provide a pulverized coal combustion device and a method of operating the same that are suitable for minimizing the generation of unburned coal.
上記目的を達成するため、本発明は以下のような特徴を
備えている。即ち、耐火物を内張りした予燃焼室に、微
粉炭に直接点火する点火バーナと、低負荷用微粉炭バー
ナを共存させた構成を特徴としている。これによりボイ
ラ起動時及び低負荷時の未燃分の発生を最小限にするこ
とができる。In order to achieve the above object, the present invention has the following features. That is, it is characterized by a configuration in which an ignition burner that directly ignites pulverized coal and a low-load pulverized coal burner coexist in a pre-combustion chamber lined with refractory material. This makes it possible to minimize the generation of unburned matter during boiler startup and low load.
また、微粉炭直接点火に１０００℃以上に昇温できる発
熱体を用い、給単ｔ／燃焼空気比（Ｃ／Ａ ）を０，５
以上、バーナノズル出口の空気流速を１０ｍ／ｓ以下、
好ましくは、Ｃ／Ａを１．０以−ヒ、空気流速５ ”／
ｓ以下とする。In addition, a heating element that can raise the temperature to over 1000°C is used for direct ignition of pulverized coal, and the unit ton of supply/combustion air ratio (C/A) is set to 0.5.
Above, the air flow velocity at the burner nozzle outlet is 10 m/s or less,
Preferably, the C/A is 1.0 or more and the air flow rate is 5"/
s or less.
この場合、直接点火に用いる微粉炭は、２００メッシュ
アンダ８０％以上のこまかい粒度のものを用いる。In this case, the pulverized coal used for direct ignition has a fine particle size of 80% or more under 200 mesh.
ボイラ低負荷用微粉炭バーナは、予燃焼室に内張りした
耐火物の表面温度が１０００℃以トになっていることを
確認後起動する。The boiler low-load pulverized coal burner is activated after confirming that the surface temperature of the refractory lining the pre-combustion chamber is 1000°C or higher.
また、予燃焼室出口に燃焼負荷をあげ、保炎性を向上す
るため、多孔体例えばアラミックスハニカム担体を設置
する。Furthermore, in order to increase the combustion load and improve flame stability at the outlet of the pre-combustion chamber, a porous material such as an aramix honeycomb carrier is installed.
第３〜５図に実検例を示すように、比較的こまかい粒度
の微粉炭を用い、給炭ｔ／燃焼空気比（Ｃ／Ａ ）を０
．５以上、空気流速を１．０ ｍ／ｓ以下、好ましくは
、Ｃ／Ａを１，０以上、空気流速を５ｍ／ｓ以下に設定
することにより、常温の燃焼空気を用いて微粉炭に直接
点火することが可能である。As shown in Figures 3 to 5, pulverized coal with a relatively fine particle size is used, and the coal feeding t/combustion air ratio (C/A) is set to 0.
．． 5 or more, the air flow velocity is 1.0 m/s or less, preferably C/A is 1.0 or more, and the air flow velocity is 5 m/s or less. It is possible to ignite it.
しかし、現状技術における微粉炭用ミルの性能は、２０
０メツシュアンダ８０％程度が、限度であり、ヒユーエ
ルパイプ中の搬送を考慮しＣＣ／Ａを０．４〜０．５程
度とし、搬送速度を１５〜２０ ｍ／８に設定し運転さ
れているため、この系統とは別に比較的にこまかい粒度
の微粉炭を用い、上記点火条件を満足させることのでき
るビン方式の微粉炭直接点火バーナと、通常の粒度の微
粉炭を用いる低負荷運転用微粉炭バーナを１つの予燃焼
室に組込む。まず、ビン方式点火システムにより、比較
的にこまかい粒度の微粉炭に電気式抵抗発熱体を１、
ＯＯＯ℃〜１．１００℃に発熱させて点火する。However, the performance of the pulverized coal mill under the current technology is 20
0 mesh under 80% is the limit, and considering the conveyance in the fuel pipe, the CC/A is set to about 0.4 to 0.5, and the conveyance speed is set to 15 to 20 m/8. Therefore, in addition to this system, we have developed a bottle-type pulverized coal direct ignition burner that uses pulverized coal with a relatively fine grain size and can satisfy the above ignition conditions, and a pulverized coal burner for low-load operation that uses pulverized coal with a normal grain size. A charcoal burner is incorporated into one pre-combustion chamber. First, by using a bottle-type ignition system, one electric resistance heating element was applied to pulverized coal of relatively fine grain size.
Generate heat to OOO℃~1.100℃ and ignite.
そして、予燃焼室の耐火壁を十分加熱した後、通常の微
粉炭を用いる低負荷運転用微粉炭バーナを起動する。After the fireproof wall of the pre-combustion chamber is sufficiently heated, a pulverized coal burner for low-load operation using normal pulverized coal is started.
それによって、予燃焼室の耐火壁からのふく射熱により
、微粉炭中の揮発成分の蒸発が促進され、高負荷燃焼域
が予燃焼室に形成されるため、固形炭素成分の燃焼が可
能となり、未燃分の発生が防止できる。As a result, the evaporation of volatile components in the pulverized coal is promoted by the radiated heat from the fireproof wall of the pre-combustion chamber, and a high-load combustion zone is formed in the pre-combustion chamber, making it possible to burn solid carbon components and The generation of fuel can be prevented.
前記、微粉炭直接点火バーナの起動に常温の燃焼空気を
用いた場合には、予燃焼室内の耐火壁が初期の段階にお
いては、十分加熱されていないため、一部未燃分が予燃
焼室の下部にたまるが、時間の経過と共に耐火壁の温度
の上昇に伴い固形炭素成分が分解され燃焼させることが
可能である。As mentioned above, when room temperature combustion air is used to start the pulverized coal direct ignition burner, the fireproof wall in the pre-combustion chamber is not sufficiently heated at the initial stage, so some unburned matter flows into the pre-combustion chamber. However, over time, as the temperature of the fireproof wall increases, the solid carbon components are decomposed and can be burned.
しかし、初期の段階の未燃分を屯極力少なくしたい場合
には、微燃炭直接点火バーナの出口ノズル部に電気式モ
ータ等を設け、予熱空気温度をあけることにより、未燃
分の発生を防止できる。However, if you want to minimize the amount of unburned matter in the initial stage, you can prevent the generation of unburned matter by installing an electric motor, etc. at the outlet nozzle of the direct ignition burner of slightly combustible coal, and increasing the preheating air temperature. can.
〔実施例１〕
第１図に本発明による微粉炭燃焼装置の構造を示す。ボ
イラの火炉２１の水冷壁２２に予燃焼室２３を設ける。[Example 1] Fig. 1 shows the structure of a pulverized coal combustion apparatus according to the present invention. A pre-combustion chamber 23 is provided in a water-cooled wall 22 of a furnace 21 of a boiler.
予燃焼室２３の上部に微粉炭点火バーナノズル２５を設
ける。このバーナノズル２５に、電気式ヒータ２６を設
け、その上部には、逆火防止用オリフィス２７を設け、
この部分の空気流速は２０ ｍ／ｓ程度に設定する。A pulverized coal ignition burner nozzle 25 is provided above the pre-combustion chamber 23. This burner nozzle 25 is provided with an electric heater 26, and an orifice 27 for preventing backfire is provided on the top thereof.
The air flow velocity in this part is set to about 20 m/s.
点火時には、バーナノズル２５を電気式ヒータ２６にて
加熱して、燃焼空気温度を３００℃〜３５０℃に昇温し
、バーナノズル２５の先端に設けた発熱体３０に通電ず
１． ｏ ｏ ｏ℃〜１．１００℃とし、さらに、太平
洋炭４００メツシュアンダ９５１以上の微粉炭をためた
超微粉炭バンカ２９からフイダ２８により、給炭量／燃
焼空気量比（Ｃ／Ａ）が１．０以上か、バーナノズル２
５の出口空気流速が１０ ｍ７ｇ以下になるように給炭
すると、微粉炭に着火しバーナノズル２５の先端に火炎
が形成される。At the time of ignition, the burner nozzle 25 is heated by the electric heater 26 to raise the combustion air temperature to 300°C to 350°C, and the heating element 30 provided at the tip of the burner nozzle 25 is not energized. o o o°C to 1.100°C, and the feeder 28 from the ultra-pulverized coal bunker 29, which stores pulverized coal of Taiheiyo Coal 400 mesh under 951 or more, increases the coal supply amount/combustion air amount ratio (C/A) to 1. .0 or more or burner nozzle 2
When coal is fed so that the air flow rate at the outlet of No. 5 is 10 m7g or less, the pulverized coal is ignited and a flame is formed at the tip of the burner nozzle 25.
予燃焼室２３の火炉側へのガス出口孔には、予燃焼室２
３の熱負荷をあげるために、リブ厚Ｚ ０１１１゜セル
巾１Ｏ１ｌｌ、奥行１００１ｍのハニカム状アルミナセ
ラミックス多孔体３２が設けてあり、予燃焼室２３の耐
火壁の表面近傍の温度な熱電対３１で検出し、１． Ｑ
Ｏ０℃に達したところで、低負荷用微粉炭バーナ２４
より２００メッシュアンダ８０％の微粉炭をＣ／Ａ０．
４で投入すると、微粉炭に着火した。火炎は、予燃焼室
２３内と、多孔体３２の後流側に形成され、多孔体３２
は、予燃焼室２３の熱負荷をあげる効果ばかりでなく、
火炉２１からの冷空気の流入防止や、保炎効果を有する
ことが分った。The gas outlet hole of the pre-combustion chamber 23 toward the furnace side has the pre-combustion chamber 2
In order to increase the heat load of 3, a honeycomb-shaped alumina ceramic porous body 32 with a rib thickness of Z 0111°, a cell width of 1011, and a depth of 1001 m is provided. Detect, 1. Q
When the temperature reaches O0℃, the low load pulverized coal burner 24
200 mesh under 80% pulverized coal with C/A0.
When the coal was added at step 4, the pulverized coal ignited. The flame is formed in the pre-combustion chamber 23 and on the downstream side of the porous body 32.
Not only has the effect of increasing the heat load on the pre-combustion chamber 23, but also
It was found that it prevents the inflow of cold air from the furnace 21 and has a flame-holding effect.
〔実施例２〕
前記実施例１と同様に１ワ一クワース炭２００メツシユ
アンダ８０％を用いて、Ｃ／Ａが２０゜点火バーナノズ
ル２５の出口流速を５ｍ／８に設定し点火した。この場
合、予燃焼室２３の耐火壁の温度が十分上昇するまでに
、予燃焼室２３の底部に未燃分のチャーが形成されたの
で、燃焼空気を５００℃〜６００℃にあげた。これによ
り、未燃分の発生が低減できた。[Example 2] In the same manner as in Example 1, ignition was carried out using 80% charcoal 200 mesh under 80% C/A and an ignition burner nozzle 25 of 20 degrees C/A and setting the exit flow velocity of the burner nozzle 25 to 5 m/8. In this case, since unburned char was formed at the bottom of the pre-combustion chamber 23 by the time the temperature of the fireproof wall of the pre-combustion chamber 23 rose sufficiently, the combustion air was raised to 500° C. to 600° C. This made it possible to reduce the generation of unburned matter.
〔実施例３〕
実施例１と同様に１太平洋炭２００メッシュアンダ８０
％を用いて、Ｃ／Ａを０．４〜０．５とし、電気式ヒー
タ２６の加熱管をアルミナセラミックスに変えて耐熱性
をあげ、加熱管の内表面温度を、１０００℃〜１１００
℃にあげた。この場合、電気式発熱体３０を用いなくて
も、加熱管の出口に火炎が形成された。しかし乍ら、電
気式ヒータの電気消費量が大巾に増加し、点火に軽油を
用いても同程度コストになり、ランニングコストの点で
はさほどメリットがないことが分かった。[Example 3] Same as Example 1, 1 Pacific coal 200 mesh under 80
%, C/A is set to 0.4 to 0.5, the heating tube of the electric heater 26 is changed to alumina ceramics to improve heat resistance, and the inner surface temperature of the heating tube is set to 1000℃ to 1100℃.
I raised it to ℃. In this case, a flame was formed at the outlet of the heating tube even without using the electric heating element 30. However, it has been found that the electricity consumption of the electric heater has increased significantly, and even if light oil is used for ignition, the cost is about the same, so there is no significant advantage in terms of running costs.
〔実施例４〕
更に、微粉炭の供給系統に改良を加えた本発明の実施例
を第２図に示す。直接点火に用いる微粉炭は、粒度のこ
まかい方が望ましい。しかし、通常ミルで粉砕される粒
度は、２００メツシュアンダ８０チ程度であり、これを
さらに微粒化するために、別工程で衝突粉砕方式を用い
たジェットミル等で粉砕し、点火用微粉炭とすることＫ
は不便がある。[Embodiment 4] FIG. 2 shows an embodiment of the present invention in which the pulverized coal supply system was further improved. It is desirable that the pulverized coal used for direct ignition be fine in particle size. However, the particle size normally crushed by a mill is about 200 mesh and 80 inches, and in order to make it even more fine, it is crushed in a separate process using a jet mill using an impact crushing method to produce pulverized coal for ignition. KotoK
is inconvenient.
そこで、本実施例は前記第１〜第３実施例における微粉
炭の供給系統を更に改良している。実施例において、石
炭バンカ４２からフイダ４３によりミル４４に供給され
、粉砕された微粉炭を分級器４７に送り、点火バーナ用
給炭ライン４８を通して、超微粉炭バンカ４９に供給す
る。超微粉炭バンカ４９の微粉炭量が点火に必要な量以
上になると、微粉炭焚イラ５０により微粉炭直接点火バ
ーナ５１に給炭し、点火する。さらに、予燃焼室５２に
内張りした耐火物の表面温度が１０００℃に達したこと
を検出し、分級善人ロダンバ５３を閉、低負荷バーナ用
給炭ライン４６のダンパ５４を開とし、低負荷バーナ５
５を起動する。Therefore, in this embodiment, the pulverized coal supply system in the first to third embodiments is further improved. In the embodiment, pulverized coal is supplied from a coal bunker 42 to a mill 44 through a feeder 43, sent to a classifier 47, and supplied to an ultra-fine coal bunker 49 through an ignition burner coal feed line 48. When the amount of pulverized coal in the ultra-pulverized coal bunker 49 exceeds the amount required for ignition, the pulverized coal burner 50 feeds the pulverized coal directly to the pulverized coal direct ignition burner 51 and ignites it. Furthermore, it is detected that the surface temperature of the refractory lined in the pre-combustion chamber 52 has reached 1000°C, the classification good man rodan bar 53 is closed, the damper 54 of the coal feed line 46 for the low-load burner is opened, and the low-load burner 5
Start 5.
さらに、火炉４１出ロガス温度を検出し、この温度がＳ
ＯＯ℃前後に達したところで、高負荷バーナ用給炭ライ
ン４５のダンパ５６を開とし、高負荷バーナ５７を起動
するのである。Furthermore, the log gas temperature from the furnace 41 is detected, and this temperature is S
When the temperature reaches around OO°C, the damper 56 of the high-load burner coal supply line 45 is opened and the high-load burner 57 is started.
以上説明したように、本発明によれば、微粉炭直接点火
及び低負荷時において、微粉炭専焼が可能となり、従来
の如く、軽油、ガス、重油等の助燃な必要としない。従
って油及びガス系統の省略による設備費の低減ならびに
燃料費の大巾な低減ができる。As explained above, according to the present invention, pulverized coal can be directly ignited and pulverized coal can be exclusively burned under low load, and there is no need for auxiliary combustion such as light oil, gas, heavy oil, etc. as in the past. Therefore, equipment costs can be reduced by omitting oil and gas systems, and fuel costs can be significantly reduced.
また、予燃焼室内には点火用微粉炭バーナと低負荷用微
粉炭バーナとを別途膜げているので、起動時に未燃燃料
が残る可能性も少なく、かつ低負荷時においても安定し
た火炎を保持できるものである。In addition, the pulverized coal burner for ignition and the pulverized coal burner for low load are installed separately in the pre-combustion chamber, so there is less chance of unburned fuel remaining at startup, and a stable flame is maintained even under low load. It is something that can be maintained.
第１図は、本発明になる微粉炭燃焼装置の一実施例な示
す側面図、第２図は、本発明になる微粉炭燃焼装置を用
いたボイラの運転方法に関する一実施例を示す説明図、
第３図は、電気式抵抗発熱体を用いて直接点火する場合
の、点火バーナノズル出口の空気流速と安定着火に必要
な発熱体の発熱温度の関係を示す実験データ、第４図は
同じく給炭量／燃焼空気量比（Ｃ／Ａ）との関係を示す
実験データ、第５図は、微粉炭の粒度及び炭種の影響に
関する実験データである。
第６図は、従来の微粉炭焚ボイラの燃料系統説明図であ
る。
２３．５２・・・・・・予燃焼室、２４．５５・・・・
・・低負荷用微粉炭バーナ、２５．５１・・・・・・微
粉炭点火バーナ、３０・・・・・・発熱体、３２・・・
・・・多孔体、４７・・・・・・分級器、５７・・・・
・・高負荷バーナ。FIG. 1 is a side view showing an embodiment of the pulverized coal combustion apparatus according to the present invention, and FIG. 2 is an explanatory diagram showing an embodiment of a boiler operating method using the pulverized coal combustion apparatus according to the present invention. ,
Figure 3 shows experimental data showing the relationship between the air flow velocity at the outlet of the ignition burner nozzle and the heat generation temperature of the heating element required for stable ignition when direct ignition is performed using an electric resistance heating element. Figure 5 shows experimental data showing the relationship between the amount of combustion air and the combustion air amount ratio (C/A). FIG. 6 is an explanatory diagram of a fuel system of a conventional pulverized coal-fired boiler. 23.52... Pre-combustion chamber, 24.55...
...Low load pulverized coal burner, 25.51...Pulverized coal ignition burner, 30...Heating element, 32...
... Porous body, 47 ... Classifier, 57 ...
...High load burner.
Claims (8)
火する点火バーナと低負荷用微粉炭バーナとを設けたこ
とを特徴とする微粉炭燃焼装置。(1) A pulverized coal combustion device characterized in that a pre-combustion chamber lined with refractory material is provided with an ignition burner that directly ignites pulverized coal and a low-load pulverized coal burner.
０００℃以上に昇温できる電気式抵抗発熱体を用いるこ
とを特徴とする特許請求の範囲第（１）項記載の微粉炭
燃焼装置。(2) As the ignition burner that directly ignites pulverized coal, 1
The pulverized coal combustion apparatus according to claim (1), characterized in that an electric resistance heating element capable of raising the temperature to 000°C or higher is used.
て、給炭量／燃焼空気比（Ｃ／Ａ）を０．５以上、バー
ナノズル出口の空気流速を１０ｍ／ｓ以下、微粉炭粒度
を、２００メツシユ以下としたことを特徴とする特許請
求の範囲第（１）項記載の微粉炭燃焼装置。(3) The ignition conditions for the ignition burner that directly ignites pulverized coal are: coal feed amount/combustion air ratio (C/A) of 0.5 or more, air flow velocity at the burner nozzle outlet of 10 m/s or less, pulverized coal particle size: The pulverized coal combustion apparatus according to claim (1), characterized in that the pulverized coal combustion apparatus has a mesh size of 200 meshes or less.
性向上をはかる多孔体を設置したことを特徴とする特許
請求の範囲第（１）項記載の微粉炭燃焼装置。(4) The pulverized coal combustion apparatus according to claim 1, wherein a porous body is installed at the outlet of the pre-combustion chamber to improve the heat load and flame stability within the pre-combustion chamber.
と低負荷バーナ用微粉炭とは、ミル出口給炭管から分岐
し、分級器により分級されたものであることを特徴とす
る特許請求の範囲第（１）項記載の微粉炭燃焼装置。(5) A patent characterized in that the pulverized coal for the ignition burner and the pulverized coal for the low-load burner supplied into the pre-combustion chamber are branched from the mill outlet coal feed pipe and classified by a classifier. A pulverized coal combustion device according to claim (1).
する点火バーナと低負荷用微粉炭バーナを設け、前記点
火バーナによって予燃焼室に内張りした耐火物の表面温
度が１０００℃以上になっていることを検出し、これに
基づき前記低負荷用微粉炭用バーナを起動することを特
徴とする微粉炭燃焼装置の運転方法。(6) An ignition burner that directly ignites pulverized coal and a low-load pulverized coal burner are installed in the pre-combustion chamber lined with refractory material, and the ignition burner raises the surface temperature of the refractory lining the pre-combustion chamber to 1000°C or higher. 1. A method for operating a pulverized coal combustion apparatus, characterized in that the low-load pulverized coal burner is activated based on this detection.
より、火炉出口のガス温度が所定の温度になったことを
検出して火炉内に設けられた高負荷用微粉炭バーナを起
動することを特徴とした特許請求の範囲第（６）項記載
の微粉炭燃焼装置の運転方法。(7) The combustion device of the ignition burner and low-load burner detects that the gas temperature at the furnace outlet reaches a predetermined temperature, and starts the high-load pulverized coal burner provided in the furnace. A method for operating a pulverized coal combustion apparatus according to claim (6), characterized in that:
において使用することを特徴とする特許請求の範囲第（
７）項記載の微粉炭燃焼装置の運転方法。(8) The low-load pulverized coal burner is used at a boiler load of 50% or less.
7) Operating method of the pulverized coal combustion device described in section 7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19823286A JPS6354505A (en) | 1986-08-26 | 1986-08-26 | Pulverized coal firing equipment and method of operating the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19823286A JPS6354505A (en) | 1986-08-26 | 1986-08-26 | Pulverized coal firing equipment and method of operating the same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6354505A true JPS6354505A (en) | 1988-03-08 |
Family
ID=16387702
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19823286A Pending JPS6354505A (en) | 1986-08-26 | 1986-08-26 | Pulverized coal firing equipment and method of operating the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6354505A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002338972A (en) * | 2001-05-15 | 2002-11-27 | Babcock Hitachi Kk | Apparatus for supplying pulverized coal in coal gasification plant |
| KR100765689B1 (en) | 2007-05-14 | 2007-10-12 | 채혁 | Safety burner using wood chip or pellet as fuel |
| JP2016533467A (en) * | 2013-10-18 | 2016-10-27 | ミツビシ ヒタチ パワー システムズ ヨーロッパ ゲーエムベーハー | Method for ignition of a power plant burner and pulverized coal burner suitable for the method |
-
1986
- 1986-08-26 JP JP19823286A patent/JPS6354505A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002338972A (en) * | 2001-05-15 | 2002-11-27 | Babcock Hitachi Kk | Apparatus for supplying pulverized coal in coal gasification plant |
| KR100765689B1 (en) | 2007-05-14 | 2007-10-12 | 채혁 | Safety burner using wood chip or pellet as fuel |
| JP2016533467A (en) * | 2013-10-18 | 2016-10-27 | ミツビシ ヒタチ パワー システムズ ヨーロッパ ゲーエムベーハー | Method for ignition of a power plant burner and pulverized coal burner suitable for the method |
| US10309644B2 (en) | 2013-10-18 | 2019-06-04 | Mitsubishi Hitachi Power Systems Europe Gmbh | Method for the ignition of a power plant burner, and coal dust burner suitable for the method |
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