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JP2012132602A - Biomass and coal mixed-firing system - Google Patents

Biomass and coal mixed-firing system
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JP2012132602A
JP2012132602AJP2010283812AJP2010283812AJP2012132602AJP 2012132602 AJP2012132602 AJP 2012132602AJP 2010283812 AJP2010283812 AJP 2010283812AJP 2010283812 AJP2010283812 AJP 2010283812AJP 2012132602 AJP2012132602 AJP 2012132602A
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biomass
coal
powder
ash
additive
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JP5627441B2 (en
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Yoshihiko Tsuchiyama
佳彦 土山
Tomoaki Sugiyama
友章 杉山
Shigenori Suemori
重徳 末森
Sadahisa Yamamoto
禎久 山本
Makoto Sudo
誠 須藤
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Mitsubishi Heavy Industries Ltd
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Abstract

Translated fromJapanese

【課題】バイオマスを燃焼させる際においても、灰付着の少ないバイオマス・石炭混焼システムを提供する。
【解決手段】本発明に係るバイオマス・石炭混焼システム10Aは、石炭11を粉砕し、石炭粉体12を得る石炭粉砕装置13と、バイオマス14を粉砕し、バイオマス粉体15を得るバイオマス粉砕装置16と、前記石炭粉体12とバイオマス粉体15とが各々供給されるボイラ火炉17とを有し、前記バイオマス粉砕装置16での粉砕の際に、前記バイオマス14に添加物18を添加しつつ混合粉砕する。
【選択図】図1
Provided is a biomass-coal co-firing system with less ash adhesion even when burning biomass.
A biomass-coal mixed combustion system 10A according to the present invention includes a coal pulverizer 13 for pulverizing coal 11 to obtain coal powder 12, and a biomass pulverizer 16 for pulverizing biomass 14 to obtain biomass powder 15. And a boiler furnace 17 to which the coal powder 12 and the biomass powder 15 are supplied, respectively, and mixing while adding the additive 18 to the biomass 14 at the time of pulverization by the biomass pulverizer 16 Smash.
[Selection] Figure 1

Description

Translated fromJapanese

本発明は、木屑などのバイオマスを粉砕したバイオマス粉体を燃料とする混焼ボイラを備えたバイオマス・石炭混焼システムに関する。  The present invention relates to a biomass / coal co-firing system including a co-fired boiler that uses biomass powder obtained by pulverizing biomass such as wood chips as fuel.

近年、地球温暖化の観点からCO2排出の削減が推進されている。特に、発電用ボイラなどの燃焼設備においては、燃料として石炭や重油などの化石燃料が用いられることが多いが、この化石燃料は、CO2排出の問題から地球温暖化の原因となり、地球環境保全の見地からその使用が規制されつつある。また化石燃料の枯渇化の観点からもこれに代替するエネルギ資源の開発、実用化が求められている。そこで、化石燃料の代替として、バイオマスを用いた燃料の利用促進が図られている。バイオマスとは、光合成に起因する有機物であって、木質類、草木類、農作物類、厨芥類などのバイオマスがある。このバイオマスを燃料化処理することにより、バイオマスをエネルギ源又は工業原料として有効に利用することができる。In recent years, CO2 emission reduction has been promoted from the viewpoint of global warming. In particular, fossil fuels such as coal and heavy oil are often used as fuel in combustion facilities such as power generation boilers, but this fossil fuel causes global warming due to the problem of CO2 emissions, thus preserving the global environment. Its use is being regulated from the viewpoint of In addition, from the viewpoint of depletion of fossil fuels, the development and commercialization of alternative energy resources are required. Therefore, as an alternative to fossil fuels, the use of fuel using biomass has been promoted. Biomass is an organic substance resulting from photosynthesis, and includes biomass such as wood, vegetation, crops, and moss. By converting this biomass into a fuel, the biomass can be effectively used as an energy source or an industrial raw material.

再生可能エネルギであるバイオマスの高効率利用の観点から、バイオマスを燃料として用いることが行われている。燃料として用いる方法の一つに、バイオマス固形物を粉砕して微粉化し、微粉炭焚きボイラに供給して燃料として用いるものがある。これは、石炭とバイオマスとをそれぞれを単独で粉砕する単独粉砕方式と、石炭とバイオマスとを混合してから粉砕する混合粉砕方式とが知られている。  From the viewpoint of highly efficient use of biomass, which is renewable energy, biomass is used as a fuel. One of the methods used as fuel is a method in which biomass solids are pulverized and pulverized and supplied to a pulverized coal-fired boiler for use as fuel. This is known as a single pulverization method in which coal and biomass are separately pulverized, and a mixed pulverization method in which coal and biomass are mixed and then pulverized.

従来のバイオマスを石炭焚きボイラ用の粒径に粉砕し、燃料として用いる石炭・バイオマス混焼システムの一例として、バイオマスの単独粉砕を行う第1の粉砕機と、石炭の単独粉砕若しくは石炭とバイオマスの混合粉砕を行う第2の粉砕機とを設け、バイオマス性状の変動にかかわらず安定した運転を行うようにしつつ、粉砕機動力を抑えて微粉化を可能としている(例えば、特許文献1参照)。  As an example of a coal-biomass mixed combustion system that pulverizes conventional biomass into a particle size for a coal-fired boiler and uses it as a fuel, a first pulverizer that performs single pulverization of biomass and single pulverization of coal or mixing of coal and biomass A second pulverizer that performs pulverization is provided, and pulverization is enabled while suppressing the pulverizer power while performing stable operation regardless of changes in biomass properties (see, for example, Patent Document 1).

特開2008−82651号公報JP 2008-82651 A

しかしながら、バイオマスの燃焼灰は低融点であり、混焼率の増大により灰付着(スラッギング、ファウリング)及び腐食等の発生が問題となる。
特に、バイオマス燃料中のカリウム(K)、ナトリウム(Na)等のアルカリ元素は、灰中成分と反応し、低融点化合物を生成するので問題となる。さらに、この低融点化合物はバインダー作用を呈するため、灰付着を誘発し、伝熱阻害等に発展する可能性がある。
However, the combustion ash of biomass has a low melting point, and the occurrence of ash adhesion (slagging, fouling), corrosion, etc. becomes a problem due to an increase in the mixed firing rate.
In particular, alkaline elements such as potassium (K) and sodium (Na) in the biomass fuel are problematic because they react with the components in the ash to produce low melting point compounds. Furthermore, since this low melting point compound exhibits a binder action, it may induce ash adhesion and develop heat transfer inhibition.

本発明は、上記に鑑みてなされたものであって、バイオマスを燃焼させる際においても、灰付着の少ないバイオマス・石炭混焼システムを提供することを目的とする。  The present invention has been made in view of the above, and an object of the present invention is to provide a biomass-coal mixed combustion system with less ash adhesion even when biomass is burned.

上述した課題を解決するための本発明の第1の発明は、石炭を粉砕し、石炭粉体を得る石炭粉砕装置と、バイオマスを粉砕し、バイオマス粉体を得るバイオマス粉砕装置と、前記石炭粉体とバイオマス粉体とが供給されるボイラ火炉とを有し、前記バイオマス粉砕装置での粉砕の際に、前記バイオマスに添加物を添加しつつ混合粉砕することを特徴とするバイオマス・石炭混焼システムにある。  The first invention of the present invention for solving the above-described problems includes a coal pulverizing apparatus for pulverizing coal to obtain coal powder, a biomass pulverizing apparatus for pulverizing biomass to obtain biomass powder, and the coal powder. A biomass-coal co-firing system comprising a boiler furnace to which a body and biomass powder are supplied, and mixing and pulverizing while adding an additive to the biomass at the time of pulverization by the biomass pulverizer It is in.

第2の発明は、前記バイオマス粉砕装置が、石炭を供給してバイオマスと混合粉砕することを特徴とするバイオマス・石炭混焼システムにある。  2nd invention exists in the biomass-coal co-firing system characterized by the said biomass crushing apparatus supplying coal and carrying out mixing crushing with biomass.

第3の発明は、第1又は2の発明において、前記添加物が、石炭灰であることを特徴とするバイオマス・石炭混焼システムにある。  A third invention is the biomass-coal mixed combustion system according to the first or second invention, wherein the additive is coal ash.

第4の発明は、第1乃至3の何れか一つの発明において、前記添加物の粒径が、ボイラ火炉の煙道のガス流速に応じて変更することを特徴とするバイオマス・石炭混焼システムにある。  A fourth invention is the biomass-coal mixed combustion system according to any one of the first to third inventions, wherein the particle size of the additive is changed according to the gas flow rate of the flue of the boiler furnace. is there.

第5の発明は、第1乃至4の何れか一つの発明において、前記バイオマス粉体がボイラ火炉の最上段バーナより供給することを特徴とするバイオマス・石炭混焼システムにある。  A fifth invention is the biomass-coal mixed combustion system according to any one of the first to fourth inventions, wherein the biomass powder is supplied from an uppermost burner of a boiler furnace.

本発明によれば、バイオマスを燃焼する際に、ボイラ火炉の壁面への灰の付着を防止することができる。  ADVANTAGE OF THE INVENTION According to this invention, when burning biomass, adhesion of ash to the wall surface of a boiler furnace can be prevented.

図1は、本発明による実施例1に係るバイオマス・石炭混焼システムの構成を簡略に示す図である。FIG. 1 is a diagram simply showing the configuration of a biomass-coal mixed combustion system according to a first embodiment of the present invention.図2は、本発明による実施例2に係るバイオマス・石炭混焼システムの構成を簡略に示す図である。FIG. 2 is a diagram simply showing the configuration of the biomass-coal mixed combustion system according to the second embodiment of the present invention.図3は、添加物の粒径と燃焼ガスのガス流速との関係図である。FIG. 3 is a relationship diagram between the particle size of the additive and the gas flow rate of the combustion gas.図4は、煙道内での灰と添加物との挙動を示す模式図である。FIG. 4 is a schematic diagram showing the behavior of ash and additives in the flue.図5は、煙道内での灰と添加物との挙動を示す他の模式図である。FIG. 5 is another schematic diagram showing the behavior of ash and additives in the flue.

以下、本発明の好適な実施例につき、図面を参照しつつ詳細に説明する。本発明は以下の実施例に記載した内容により限定されるものではない。また、以下に記載した実施例における構成要素には、当業者が容易に想定できるもの、実質的に同一のもの、いわゆる均等の範囲のものが含まれる。さらに、以下に記載した構成要素は適宜組み合わせることが可能である。  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. The present invention is not limited by the contents described in the following examples. In addition, constituent elements in the embodiments described below include those that can be easily assumed by those skilled in the art, those that are substantially the same, and those in the so-called equivalent range. Furthermore, the constituent elements described below can be appropriately combined.

本発明による実施例1に係るバイオマス・石炭混焼システムについて、図面を参照して説明する。図1は、本発明による実施例1に係るバイオマス・石炭混焼システムの構成を簡略に示す図である。図1に示すように、バイオマス・石炭混焼システム10Aは、石炭11を粉砕し、石炭粉体12を得る石炭粉砕装置13と、バイオマス14を粉砕し、バイオマス粉体15を得るバイオマス粉砕装置16と、前記石炭粉体12とバイオマス粉体15とが各々供給されるボイラ火炉17とを有し、前記バイオマス粉砕装置16での粉砕の際に、前記バイオマス14に添加物18を添加しつつ混合粉砕するものである。  A biomass-coal mixed combustion system according to a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a diagram simply showing the configuration of a biomass-coal mixed combustion system according to a first embodiment of the present invention. As shown in FIG. 1, the biomass-coal mixedcombustion system 10 </ b> A includes acoal crusher 13 that crushescoal 11 to obtain coal powder 12, and abiomass crusher 16 that crushesbiomass 14 and obtainsbiomass powder 15. And aboiler furnace 17 to which the coal powder 12 and thebiomass powder 15 are respectively supplied, and mixed and pulverized while adding theadditive 18 to thebiomass 14 during the pulverization by thebiomass pulverizer 16. To do.

バイオマス14とは、再生可能な生物由来の有機性資源であって、化石資源を除いたものである。バイオマスとしては、例えば、間伐材、廃材木、流木、草類、廃棄物、汚泥、タイヤ及びこれらを原料としたリサイクル燃料(ペレットやチップ)などが挙げられるが、これらに限定されるものではない。  Biomass 14 is an organic resource derived from renewable organisms, excluding fossil resources. Examples of biomass include, but are not limited to, thinned wood, waste wood, driftwood, grass, waste, sludge, tires, and recycled fuel (pellets and chips) using these as raw materials. .

石炭11は、石炭貯蔵設備21から石炭ホッパ22を介して供給されている。  Coal 11 is supplied from acoal storage facility 21 via acoal hopper 22.

石炭粉砕装置13は、ホッパ22から供給された石炭11を粉砕するものであって、例えば、数μmから数百μm程度の所望の粒径に粉砕し、石炭粉体(微粉炭)とするものである。石炭粉砕装置13は、ハウジング13aと、粉砕テーブル13bと、粉砕ローラ13cと、を備える。  Thecoal crusher 13 crushes thecoal 11 supplied from thehopper 22 and crushes it to a desired particle size of, for example, about several μm to several hundred μm to obtain coal powder (pulverized coal). It is. Thecoal crusher 13 includes ahousing 13a, a crushing table 13b, and a crushingroller 13c.

本実施例では、石炭粉砕装置13として、竪型粉砕機を用いた場合について説明しているが、本実施例は、特にこれに限定されるものではなく、例えば、チューブミル、ボールミル、ローラミルなど圧砕する形式のものなど石炭11を粉砕することができるものであれば用いることができる。  In the present embodiment, a case where a vertical pulverizer is used as thecoal pulverizer 13 is described. However, the present embodiment is not particularly limited to this, for example, a tube mill, a ball mill, a roller mill, and the like. Any material that can grind thecoal 11 such as a crushing type can be used.

バイオマス14は、バイオマス貯蔵設備31からバイオマスホッパ32を介して供給されている。  Thebiomass 14 is supplied from thebiomass storage facility 31 via thebiomass hopper 32.

バイオマス粉砕装置16は、ホッパ32から供給されたバイオマス14を粉砕するものであって、例えば、平均粒径を0.5mm〜1mmの所望の粒径に粉砕し、バイオマス粉体とするものである。バイオマス粉砕装置16は、ハウジング16aと、粉砕テーブル16bと、粉砕ローラ16cと、を備える。  Thebiomass pulverizer 16 pulverizes thebiomass 14 supplied from thehopper 32. For example, thebiomass pulverizer 16 pulverizes the average particle diameter to a desired particle diameter of 0.5 mm to 1 mm to obtain biomass powder. . Thebiomass crusher 16 includes ahousing 16a, a crushing table 16b, and a crushingroller 16c.

本実施例では、バイオマス粉砕機16にはバイオマス14が供給され、粉砕するようにしているが、この粉砕において、クリンカ灰、シンダアッシュ、フライアッシュなどの石炭灰を添加物18として供給し、石炭灰を混合するようにしている。  In the present embodiment, thebiomass pulverizer 16 is supplied with thebiomass 14 and pulverized. In this pulverization, coal ash such as clinker ash, cinder ash, fly ash, etc. is supplied as anadditive 18, Ashes are mixed.

図3は、添加物の粒径と燃焼ガスのガス流速との関係図である。
添加物18を添加することにより、バイオマス燃焼灰の付着を防止することができるからである。特に、一般的な後部煙道ではガス流速は約10m/s程度であり、その場合、図3に示す添加物の粒径と燃焼ガスのガス流速との関係図より、約20μm以上の粒径を投入するのが好ましい。
FIG. 3 is a relationship diagram between the particle size of the additive and the gas flow rate of the combustion gas.
It is because adhesion of biomass combustion ash can be prevented by adding theadditive 18. In particular, in a general rear flue, the gas flow rate is about 10 m / s. In this case, the particle size of about 20 μm or more is shown from the relationship between the particle size of the additive and the gas flow rate of the combustion gas shown in FIG. Is preferably introduced.

これは、粒径が小さい粒子であると、煙道の壁面に衝突する慣性反発力よりも液架橋による付着力が相対的に大きくなり付着しやすいからである。これらの粒子の付着を抑制するためには、ガス流速を増大させる必要がある。一方、粒径が大きくなると慣性反発力の方が大きくなり、付着しにくくなる。  This is because if the particle size is small, the adhesion force due to liquid bridge is relatively larger than the inertial repulsive force that collides with the wall surface of the flue, and the particles are likely to adhere. In order to suppress the adhesion of these particles, it is necessary to increase the gas flow rate. On the other hand, when the particle size is increased, the inertial repulsion force is increased and the adhesion becomes difficult.

図4は、煙道内での灰と添加物との挙動を示す模式図である。図5は、煙道内での灰と添加物との挙動を示す他の模式図である。
図4に示すように、燃焼ガスGが流れる煙道の壁面100に付着したバイオマス灰101は、添加物18が壁面に衝突する際に、その反発の際に、灰と共に煙道内に剥離することとなる。これにより、煙道壁面へのバイオマス灰101の付着の低減となる。
FIG. 4 is a schematic diagram showing the behavior of ash and additives in the flue. FIG. 5 is another schematic diagram showing the behavior of ash and additives in the flue.
As shown in FIG. 4, when theadditive 18 collides with the wall surface, thebiomass ash 101 adhering to thewall 100 of the flue through which the combustion gas G flows is peeled into the flue together with the ash. It becomes. Thereby, adhesion ofbiomass ash 101 to the flue wall surface is reduced.

また、図5に示すように、添加剤18と灰101とが煙道内で結合すると、その灰結合物102の粒子径が大きくなり、壁面に衝突した際においても、慣性反発力で煙道に付着せずに、再度ガス中に浮遊することとなり、煙道壁面へのバイオマス灰の付着の低減となる。  Further, as shown in FIG. 5, when the additive 18 and theash 101 are combined in the flue, the particle diameter of theash combination 102 becomes large, and even when it collides with the wall surface, the inertia repulsive force causes the flue to enter the flue. Without adhering, it floats in the gas again, which reduces the adhesion of biomass ash to the flue wall.

特に、バイオマス14の混焼率が大きくなると、単独粉砕されたバイオマス粉体15の燃焼の際に、そのバーナー周りがバイオマス燃料100%の環境となってしまい、灰付着が発生するおそれが大きくなる。
このために、バイオマス粉体燃焼用の燃料バーナ17bを最上段に設置するのが好ましい。このように、最上段にバイオマス粉体用のバーナ17bを設置することで、下段の微粉炭燃料の灰に希釈され、灰付着が低減されることとなる。
In particular, when the co-firing rate of thebiomass 14 is increased, when the pulverizedbiomass powder 15 is burned, the area around the burner becomes an environment of 100% biomass fuel, and the risk of ash adhesion increases.
For this reason, it is preferable to install thefuel burner 17b for biomass powder combustion in the uppermost stage. Thus, by installing theburner 17b for biomass powder in the uppermost stage, it is diluted with the ash of the lower pulverized coal fuel, and ash adhesion is reduced.

バイオマス燃料中の灰分は1%程度であり、そのうちの10%程度が低融点化を誘発し、悪影響をおよぼす。
そこで、本発明のように、添加物18として石炭灰を灰量換算で2倍以上投入し、希釈作用により灰付着を防止するようにしている。
Ash content in biomass fuel is about 1%, of which about 10% induces a low melting point and has an adverse effect.
Therefore, as in the present invention, coal ash is added as the additive 18 more than twice in terms of ash amount, and ash adhesion is prevented by a dilution action.

一般にバーナ部の吹き出し流速は20m/s以上であり、その場合には数μm程度の添加物粒子用いることが好ましい。
バイオマス燃料中に含有される低融点灰の作用を粒子径をコントロールした手法で添加灰量を最小限にして抑制することができる。
In general, the blowing flow rate of the burner part is 20 m / s or more, and in that case, it is preferable to use additive particles of about several μm.
The action of the low melting point ash contained in the biomass fuel can be suppressed by minimizing the amount of added ash by a method in which the particle diameter is controlled.

本実施例では、石炭粉体12、バイオマス粉体15は、ボイラ火炉17から排出される燃焼排ガス(図示せず)により石炭粉砕装置13、バイオマス粉砕装置16から各々搬送するようにしているが、本実施例は、これに限定されるものではなく、燃焼排ガスの一部を1次空気に代えて搬送されるようにしてもよい。  In this embodiment, the coal powder 12 and thebiomass powder 15 are respectively conveyed from thecoal pulverizer 13 and thebiomass pulverizer 16 by combustion exhaust gas (not shown) discharged from theboiler furnace 17. The present embodiment is not limited to this, and part of the combustion exhaust gas may be transported instead of the primary air.

ボイラ火炉17は、炉本体17aと、燃焼バーナ17b、17cと、煙道17dと、伝熱管群17eとを、備える。燃焼バーナ17b、17cは、燃料供給ノズルの数に応じて炉本体17aの高さ方向に複数設けられている。  Theboiler furnace 17 includes afurnace body 17a,combustion burners 17b and 17c, aflue 17d, and a heattransfer tube group 17e. A plurality ofcombustion burners 17b and 17c are provided in the height direction of thefurnace body 17a according to the number of fuel supply nozzles.

バイオマス粉体15及び微粉炭13は、各々、燃焼バーナ17bから別々に1次空気と共に、ボイラ火炉17内に供給され、ボイラ火炉17内で混合して燃焼される。ボイラ火炉17内に供給された微粉炭13及びバイオマス粉体15は燃焼することにより燃焼排ガスGを発生する。  Thebiomass powder 15 and the pulverizedcoal 13 are separately supplied from thecombustion burner 17 b together with the primary air into theboiler furnace 17, and mixed and burned in theboiler furnace 17. The pulverizedcoal 13 and thebiomass powder 15 supplied into theboiler furnace 17 are combusted to generate combustion exhaust gas G.

炉本体17aの上部には、煙道17cが連結されている。ボイラ火炉17内で燃焼により発生した燃焼排ガスGは、煙道17dへ送給される。煙道17dには、伝熱管群17eが設けられている。伝熱管群17eは、燃焼排ガスGから熱を回収するための対流伝熱部である。  Aflue 17c is connected to the upper portion of thefurnace body 17a. The combustion exhaust gas G generated by combustion in theboiler furnace 17 is sent to theflue 17d. A heattransfer tube group 17e is provided in theflue 17d. The heattransfer tube group 17e is a convection heat transfer unit for recovering heat from the combustion exhaust gas G.

煙道17dは、熱交換を行った燃焼排ガスGが排出される排ガス配管17fと連結されている。排ガス配管17fには、脱硝装置51、空気加熱器52、排ガス処理設備53が設けられている。伝熱管群17eで熱交換された燃焼排ガスGは、脱硝装置51へ送給され、ここでNOxなど有害物質が除去された後、空気加熱器52に送給される。空気加熱器52において、燃焼排ガスGは外気54と熱交換され、排ガス処理設備である電気集塵器53に送給される。外気54は、石炭粉砕装置13に送給される空気や燃焼バーナ17b、17cに供給する燃焼用空気として200℃から300℃の範囲に昇温することが望ましい。  Theflue 17d is connected to anexhaust gas pipe 17f from which the combustion exhaust gas G subjected to heat exchange is discharged. Theexhaust gas pipe 17f is provided with adenitration device 51, anair heater 52, and an exhaustgas treatment facility 53. The combustion exhaust gas G heat-exchanged in the heattransfer tube group 17e is fed to thedenitration device 51, where harmful substances such as NOx are removed and then fed to theair heater 52. In theair heater 52, the combustion exhaust gas G is heat-exchanged with theoutside air 54, and is supplied to anelectric dust collector 53 that is an exhaust gas treatment facility. Theoutside air 54 is desirably heated to a temperature in the range of 200 ° C. to 300 ° C. as air supplied to thecoal pulverizer 13 or combustion air supplied to thecombustion burners 17b and 17c.

排ガス処理設備の電気集塵機53は、燃焼排ガスG中に含まれる粒子状物質を除去するものである。燃焼排ガスGは、電気集塵機において、燃焼排ガスG中に含まれる粒子状物質が除去された後、図示しない脱硫装置に送られ、脱硫処理された後、浄化された燃焼排ガスは、煙突から放出される。
電気集塵器53で集塵された石炭灰を、粒径選別機42で所定粒径に選別された後、添加物18として添加するために、添加物貯蔵設備41に搬送されている。
Theelectric dust collector 53 of the exhaust gas treatment facility removes particulate matter contained in the combustion exhaust gas G. After the particulate matter contained in the combustion exhaust gas G is removed in the electric dust collector, the combustion exhaust gas G is sent to a desulfurization device (not shown), and after desulfurization treatment, the purified combustion exhaust gas is discharged from the chimney. The
After the coal ash collected by theelectric dust collector 53 is sorted to a predetermined particle size by theparticle size sorter 42, the coal ash is conveyed to theadditive storage facility 41 to be added as the additive 18.

このように、本実施例に係るバイオマス・石炭混焼システム10Aによれば、バイオマス粉砕装置での粉砕の際に、前記バイオマスに添加物を添加しつつ混合粉砕するので、バイオマスを燃焼する際における、ボイラ火炉及び煙道の壁面への灰の付着を防止することができる。その結果、バイオマス・石炭混焼システムにおける運転の信頼性の向上を図ることができる。  Thus, according to the biomass-coalmixed combustion system 10A according to the present embodiment, when pulverizing with a biomass pulverizer, mixed pulverization is performed while adding additives to the biomass. It is possible to prevent ash from adhering to the boiler furnace and the wall of the flue. As a result, it is possible to improve operation reliability in the biomass-coal mixed combustion system.

本発明による実施例2に係るバイオマス・石炭混焼システムについて、図面を参照して説明する。図2は、本発明による実施例2に係るバイオマス・石炭混焼システムの構成を簡略に示す図である。なお、実施例1に係るバイオマス粉砕装置の構成と同一部材には同一符号を付してその説明は省略する。図2に示すように、本実施例に係るバイオマス・石炭混焼システム10Bは、実施例1に係るバイオマス・石炭混焼システム10Aにおいて、前記バイオマス粉砕装置16が、バイオマス14と共に、石炭11を供給してバイオマス14と混合粉砕するものである。  A biomass / coal mixed combustion system according to a second embodiment of the present invention will be described with reference to the drawings. FIG. 2 is a diagram simply showing the configuration of the biomass-coal mixed combustion system according to the second embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the same member as the structure of the biomass grinding | pulverization apparatus which concerns on Example 1, and the description is abbreviate | omitted. As shown in FIG. 2, the biomass / coal mixedcombustion system 10 </ b> B according to the present embodiment is the biomass / coal mixedcombustion system 10 </ b> A according to the first embodiment, in which thebiomass crusher 16supplies coal 11 together with thebiomass 14. It is mixed and pulverized with thebiomass 14.

実施例1では、バイオマス14単独の粉砕であったが、実施例2では、バイオマス14と石炭11との混合粉砕を行うようにしている。
この際、添加物18と同時に添加して、バイオマス・石炭混合粉砕物15Aに添加物が混合されることとなる。この結果、バイオマス・石炭混合粉砕物15Aを燃焼する際に、ボイラ火炉17の壁面への灰の付着を防止することができる。
In Example 1, thebiomass 14 was pulverized alone, but in Example 2, thebiomass 14 andcoal 11 were mixed and pulverized.
At this time, the additive is added simultaneously with the additive 18, and the additive is mixed with the biomass-coal mixed pulverized product 15A. As a result, when burning the biomass-coal mixed pulverizedproduct 15 </ b> A, ash adhesion to the wall surface of theboiler furnace 17 can be prevented.

上記各実施例では、バイオマス14と石炭11とを混焼するシステムについて説明したが、本発明はこれに限定されるものではなく、バイオマス14と石炭11以外の液体燃料(例えば重油)等とを混焼するシステムについても同様に適用可能である。  In each of the above embodiments, a system forco-firing biomass 14 andcoal 11 has been described. However, the present invention is not limited to this, andco-firing biomass 14 and liquid fuel (for example, heavy oil) other thancoal 11 or the like. The same applies to a system that performs the same.

以上のように、本発明に係るバイオマス・石炭混焼システムは、バイオマス燃焼灰の付着を軽減したバイオマス・石炭混焼システムに適している。  As described above, the biomass / coal mixed combustion system according to the present invention is suitable for a biomass / coal mixed combustion system in which adhesion of biomass combustion ash is reduced.

10A、10B バイオマス・石炭混焼システム
11 石炭
12 石炭粉体
13 石炭粉砕装置
14 バイオマス
15 バイオマス粉体
16 バイオマス粉砕装置
17 ボイラ火炉
10A, 10B Biomass-coalmixed combustion system 11 Coal 12Coal powder 13Coal crusher 14Biomass 15Biomass powder 16Biomass crusher 17 Boiler furnace

Claims (5)

Translated fromJapanese
石炭を粉砕し、石炭粉体を得る石炭粉砕装置と、
バイオマスを粉砕し、バイオマス粉体を得るバイオマス粉砕装置と、
前記石炭粉体とバイオマス粉体とが供給されるボイラ火炉とを有し、
前記バイオマス粉砕装置での粉砕の際に、前記バイオマスに添加物を添加しつつ混合粉砕することを特徴とするバイオマス・石炭混焼システム。
A coal crusher for crushing coal to obtain coal powder;
A biomass crusher for crushing biomass and obtaining biomass powder;
A boiler furnace to which the coal powder and the biomass powder are supplied;
A biomass-coal mixed combustion system characterized by mixing and pulverizing while adding an additive to the biomass during pulverization by the biomass pulverizer.
前記バイオマス粉砕装置が、石炭を供給してバイオマスと混合粉砕することを特徴とするバイオマス・石炭混焼システム。  The biomass pulverizing apparatus is characterized in that the biomass pulverizing apparatus supplies coal and mixes and pulverizes with biomass. 請求項1又は2において、
前記添加物が、石炭灰であることを特徴とするバイオマス・石炭混焼システム。
In claim 1 or 2,
The biomass / coal co-firing system, wherein the additive is coal ash.
請求項1乃至3の何れか一つにおいて、
前記添加物の粒径が、ボイラ火炉の煙道のガス流速に応じて変更することを特徴とするバイオマス・石炭混焼システム。
In any one of Claims 1 thru | or 3,
The biomass / coal co-firing system, wherein a particle size of the additive is changed according to a gas flow rate of a flue of a boiler furnace.
請求項1乃至4の何れか一つにおいて、
前記バイオマス粉体がボイラ火炉の最上段バーナより供給することを特徴とするバイオマス・石炭混焼システム。
In any one of Claims 1 thru | or 4,
A biomass-coal co-firing system, wherein the biomass powder is supplied from an uppermost burner of a boiler furnace.
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