JPH0920905A - Improvement of transportability of pulverized coal - Google Patents

Improvement of transportability of pulverized coal

Info

Publication number
JPH0920905A
JPH0920905A JP7169821A JP16982195A JPH0920905A JP H0920905 A JPH0920905 A JP H0920905A JP 7169821 A JP7169821 A JP 7169821A JP 16982195 A JP16982195 A JP 16982195A JP H0920905 A JPH0920905 A JP H0920905A
Authority
JP
Japan
Prior art keywords
pulverized coal
coal
transportability
solid compound
volume
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
Application number
JP7169821A
Other languages
Japanese (ja)
Other versions
JP2986717B2 (en
Inventor
Reiji Ono
玲児 小野
Yoshio Kimura
吉雄 木村
Takashi Nakaya
尚 中矢
Kenichi Miyamoto
健一 宮本
Takashi Matoba
隆志 的場
Takehiko Ichimoto
武彦 市本
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kao Corp
Kobe Steel Ltd
Original Assignee
Kao Corp
Kobe Steel Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Kao Corp, Kobe Steel Ltd filed Critical Kao Corp
Priority to JP7169821A priority Critical patent/JP2986717B2/en
Priority to PCT/JP1996/001875 priority patent/WO1997002363A1/en
Priority to KR1019970709915A priority patent/KR19990028593A/en
Priority to EP96922245A priority patent/EP0837143A1/en
Priority to CN96196493A priority patent/CN1194010A/en
Publication of JPH0920905A publication Critical patent/JPH0920905A/en
Application granted granted Critical
Publication of JP2986717B2 publication Critical patent/JP2986717B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21BMANUFACTURE OF IRON OR STEEL
    • C21B5/00Making pig-iron in the blast furnace
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10LFUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • C10L9/00Treating solid fuels to improve their combustion
    • C10L9/10Treating solid fuels to improve their combustion by using additives
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21BMANUFACTURE OF IRON OR STEEL
    • C21B5/00Making pig-iron in the blast furnace
    • C21B5/001Injecting additional fuel or reducing agents
    • C21B5/003Injection of pulverulent coal
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23KFEEDING FUEL TO COMBUSTION APPARATUS
    • F23K1/00Preparation of lump or pulverulent fuel in readiness for delivery to combustion apparatus
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23KFEEDING FUEL TO COMBUSTION APPARATUS
    • F23K3/00Feeding or distributing of lump or pulverulent fuel to combustion apparatus

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Solid Fuels And Fuel-Associated Substances (AREA)
  • Manufacture Of Iron (AREA)

Abstract

PROBLEM TO BE SOLVED: To improve the transportability of dried pulverized coal as well and to stably execute blowing of the pulverized coal by mixing solid compd. powder of a specific grain size at a specific ratio with the pulverized coal at the time of using the pulverized coal in a metallurgical furnace and combustion furnace. SOLUTION: The flow property of the pulverized coal varies with the kinds, particle sizes and difference in moisture of the pulverized coal to be used at the time of using the inexpensive pulverized coal in the metallurgical furnace, such as blast furnace, and the combustion furnace, such as boiler, and the discharging and transporting conditions of the pulverized coal from a hopper vary largely thereby, making the smooth transportation infeasible. The dust consisting of the solid compds., such as SiO2 , and other metal oxide, etc., having a volumetric average grain size of <=5μm is also added thereto by as much as the amt. of α(vol.%) expressed by formula I in order to improve the transportability, by which this dust is stuck to the surfaces of the pulverized coal and the flow property thereof is improved in the case of the dried positive powder coal having the average HGI of >=30 of the pulverized coal to be used for the purpose of ameliorating the shortbacks described above. The defects, such as piping closure during the transportation by the gas, the scaffolding of the pulverized coal in the hopper and blow-by, are eliminated and the stable blowing of the pulverized coal to the metallurgical furnace, etc., is assured.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、冶金炉又は燃焼炉の吹
き込み口から吹き込む微粉炭の搬送性を改良し、安定な
微粉炭の多量吹き込みを可能にした微粉炭の搬送性向上
剤及びこれを用いた冶金炉又は燃焼炉の操業方法に関す
るものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention improves the transportability of pulverized coal blown from the inlet of a metallurgical furnace or a combustion furnace, and makes it possible to stably blow a large amount of pulverized coal. The present invention relates to a method of operating a metallurgical furnace or a combustion furnace using the.

【0002】[0002]

【従来の技術】冶金炉、例えば高炉の操業においては、
コークスと鉄鉱石を炉頂から交互に装入する方法が一般
的に行われてきたが、近年、炉頂から装入するコークス
の一部を安価で燃焼性が良く発熱量の高い微粉炭を熱風
とともに高炉の吹き込み口より吹き込むことで代替する
方法が盛んに行われている。このような微粉炭吹き込み
操業法は、オールコークス操業に比べて燃料費を低減で
きる等の点で優れている。
In the operation of metallurgical furnaces such as blast furnaces,
The method of alternately charging coke and iron ore from the top of the furnace has been generally used, but in recent years, a part of the coke charged from the top of the furnace was replaced with pulverized coal that is inexpensive, highly combustible, and has a high calorific value. The method of substituting by blowing from the blowing port of the blast furnace together with hot air is actively used. Such a pulverized coal blowing operation method is superior in that the fuel cost can be reduced as compared with the all coke operation.

【0003】また、ボイラー等の燃焼炉の燃料としても
重油に代わるものとして石炭が見直されている。燃焼炉
における石炭の使用形態としてはCWM(石炭−水スラ
リー)、COM(石炭重油混合燃料)、微粉炭等がある
が、この中でも特に微粉炭燃焼炉は水や油等の他の媒体
を必要としないため、注目されている。しかし、この微
粉炭燃焼炉においても高炉操業における微粉炭の使用と
同様の問題を抱えている。
Further, coal has been reviewed as an alternative to heavy oil as a fuel for combustion furnaces such as boilers. CWM (coal-water slurry), COM (coal heavy oil mixed fuel), pulverized coal, and the like are used as coal in the combustion furnace. Among them, the pulverized coal combustion furnace particularly requires other media such as water and oil. And because it doesn't, it is getting attention. However, this pulverized coal combustion furnace also has the same problem as the use of pulverized coal in blast furnace operation.

【0004】微粉炭吹き込みにおいては、原炭の乾式粉
砕による微粉炭製造、分級、ホッパーでの貯蔵・排出、
配管での気体輸送、吹き込み口からの冶金炉又は燃焼炉
への吹き込み、冶金炉又は燃焼炉内での燃焼という工程
をたどるが、微粉炭のホッパーからの排出・配管での気
体輸送について以下の問題点がある。
In blowing pulverized coal, pulverized coal is produced by dry pulverization of raw coal, classification, storage / discharge in a hopper,
Follow the steps of gas transportation through piping, blowing into the metallurgical furnace or combustion furnace from the blowing port, and combustion within the metallurgical furnace or combustion furnace.The discharge of pulverized coal from the hopper and gas transportation through piping are as follows. There is a problem.

【0005】すなわち、排出・輸送せんとする微粉炭の
炭種、粒子径、水分の違いによって微粉炭の流動性等の
粉体の基礎物性が変化することにより、排出・輸送状況
が大きく変化する。このため、微粉炭の基礎物性が最適
範囲を外れた場合には、ホッパーでの棚吊り・吹き抜
け、気体輸送中の配管閉塞などを引き起こすことにな
り、安定な微粉炭吹き込みを長期間継続することは困難
である。
That is, the basic physical properties of the powder such as the fluidity of the pulverized coal change depending on the type of coal, particle size, and water content of the pulverized coal to be discharged / transported, so that the discharge / transport situation greatly changes. . Therefore, if the basic physical properties of pulverized coal deviate from the optimum range, it will cause hanging or blow-by of shelves in the hopper, blockage of pipes during gas transportation, etc. It is difficult.

【0006】このような問題点を解決するために、微粉
炭の搬送性を改善することが考えられ、従来種々の方法
が提案されている。例えば、チャーを微粉炭中に5〜20
%混合する(特開平4−268004号公報)、石炭中のイナ
ート(JIS M8816-1979に規定されているミクリニット、
1/3セミフジニット、フジニットおよび鉱物質を合計
したもの)成分量を調節した後微粉砕する(特開平5−
9518号公報、特開平5−25516 号公報、特開平5−2224
15号公報)、吹き込む微粉炭の石炭種を限定することに
より流動性指数を用いる高炉の基準値以上とする(特開
平4−224610号公報)、微粉炭と配管との摩擦係数を調
整する(特開平5−214417号公報)、微粉炭中の水分を
適正値になるように制御する(特開平5−78675 号公
報)等が挙げられる。また、微粉炭の粉砕効率を向上さ
せる方法として分散剤を吸着させる方法(特開昭63−22
4744号公報)があるが、この方法では微粉炭の搬送性に
ついては言及されていない。
In order to solve such a problem, it is considered to improve the transportability of pulverized coal, and various methods have been proposed in the past. For example, char in pulverized coal 5-20
% Mixing (Japanese Patent Laid-Open No. 4-268004), inert in coal (MICLINIT prescribed by JIS M8816-1979,
Finely pulverized after adjusting the amount of components (total of 1/3 semi-fujinit, fujinit and minerals)
9518, JP-A-5-25516, JP-A-5-2224
No. 15), the coal type of the pulverized coal to be blown is limited so that it is equal to or higher than the reference value of the blast furnace using the fluidity index (JP-A-4-224610), and the friction coefficient between the pulverized coal and the pipe is adjusted ( JP-A-5-214417) and controlling the water content in the pulverized coal to an appropriate value (JP-A-5-78675). Further, as a method for improving the pulverization efficiency of pulverized coal, a method of adsorbing a dispersant (JP-A-63-22).
No. 4744), but this method does not mention the transportability of pulverized coal.

【0007】[0007]

【発明が解決しようとする課題】しかしながら、上記の
ような方法では微粉炭吹き込みに使用できる石炭種が限
定されたり、ホッパーでの棚吊り・吹き抜け、配管の閉
塞が充分に解消されなかったり、制御の装置や設備など
にコストがかかるなどの問題点があり、実用上満足のい
く方法は提供されていない。
However, in the above-mentioned method, the kinds of coal that can be used for blowing pulverized coal are limited, the hanging and blowing through of the hopper in the hopper, and the clogging of the pipe are not sufficiently solved, and the control is not possible. However, there is a problem in that the equipment and facilities are expensive, and a method that is practically satisfactory is not provided.

【0008】更に、例えば現在の高炉の操業方法では、
吹き込み口から吹き込む微粉炭の量は50〜250kg /銑鉄
1t程度であるが、コストの面からは更に微粉炭の吹き
込み量を増やすことが望ましい。しかしながら、前記の
方法では微粉炭の搬送性が必ずしも充分でないため、微
粉炭の吹き込み量の大幅な向上は達成できない。
Further, for example, in the current method of operating a blast furnace,
The amount of pulverized coal blown from the blowing port is about 50 to 250 kg / pig of pig iron, but it is desirable to further increase the amount of pulverized coal blown from the viewpoint of cost. However, since the pulverized coal is not always sufficiently conveyed by the above method, it is not possible to significantly improve the blowing amount of the pulverized coal.

【0009】従って、本発明の目的は、上記した従来方
法にあった問題点を解決し、微粉炭の搬送性を改良し、
石炭種の限定を取り除き、配管閉塞・ホッパーでの棚吊
りを防止し、安定した微粉炭多量吹き込みを可能とする
ことである。
Therefore, the object of the present invention is to solve the above-mentioned problems in the conventional method and to improve the transportability of pulverized coal.
The purpose is to remove restrictions on coal types, prevent pipe blockages and hanging in hoppers, and enable stable large-scale injection of pulverized coal.

【0010】[0010]

【課題を解決するための手段】本発明者らは上記の目的
を達成すべく鋭意研究した結果、体積平均粒子径と添加
量が特定の関係を満たす体積平均粒子径が5μm 以下の
固体化合物を、原炭の平均HGIが30以上の微粉炭に付
着させることにより、かかる微粉炭の搬送性が飛躍的に
向上することを見出し、本発明を完成するに至った。
Means for Solving the Problems As a result of intensive studies aimed at achieving the above object, the present inventors have found that a solid compound having a volume average particle diameter of 5 μm or less satisfying a specific relationship between the volume average particle diameter and the amount added. The inventors have found that by adhering the raw coal to the pulverized coal having an average HGI of 30 or more, the transportability of the pulverized coal is dramatically improved, and the present invention has been completed.

【0011】すなわち本発明は、原炭の平均HGIが30
以上の乾燥した微粉炭の搬送性を向上させる方法であっ
て、体積平均粒子径が5μm 以下の固体化合物を、下式
のα(体積%)で示される量、前記微粉炭に添加し当該
微粉炭の表面に付着させることを特徴とする微粉炭の搬
送性向上方法、及びかかる方法に用いられる微粉炭の搬
送性向上剤と微細な微粉炭とからなる微粉炭を提供する
ものである。また、本発明はかかる搬送性向上剤と微細
な微粉炭を使用した冶金炉又は燃焼炉の操業方法を提供
するものである。 k1・r0.59≦α≦10(体積%) 〔ここで、k1=10-1.42、rは添加する固体化合物の体
積平均粒子径 (μm)である。〕本発明の搬送性向上剤を
用いた冶金炉或いは燃焼炉の操業方法は、冶金炉或いは
燃焼炉の吹き込み口から吹き込む微粉炭に対し、上式の
範囲で搬送性向上剤を微粉炭に添加し、当該微粉炭を冶
金炉或いは燃焼炉の吹き込み口から吹き込むことを特徴
とする。この微粉炭に対する添加量は、k1・r0.59
積%以上である方が搬送性向上効果から好ましく、また
10重量%を超えて添加しても添加量に見合う効果の向上
は認められず経済的には不利となる。なお、本発明にお
ける個体化合物の体積平均粒子径(r)と添加量(α)
の関係を図1に示す。
That is, according to the present invention, the average HGI of raw coal is 30.
A method for improving the transportability of dried pulverized coal as described above, comprising adding a solid compound having a volume average particle size of 5 μm or less to the pulverized coal in an amount represented by α (volume%) in the following formula. The present invention provides a method for improving the transportability of pulverized coal, which is characterized in that the pulverized coal is adhered to the surface of the coal, and a pulverized coal comprising a pulverized coal transportability improving agent and fine pulverized coal used in the method. The present invention also provides a method for operating a metallurgical furnace or a combustion furnace using such a transportability improver and fine pulverized coal. k 1 · r 0.59 ≦ α ≦ 10 (volume%) [where k 1 = 10 −1.42 and r is the volume average particle diameter (μm) of the solid compound to be added. ] A method of operating a metallurgical furnace or a combustion furnace using the transportability improver of the present invention is, for a pulverized coal blown from a blowing port of a metallurgical furnace or a combustion furnace, a transportability improver added to the pulverized coal within the range of the above formula. However, the pulverized coal is blown from a blowing port of a metallurgical furnace or a combustion furnace. It is preferable that the addition amount to the pulverized coal is k 1 · r 0.59 % by volume or more from the effect of improving the transportability.
Even if it is added in excess of 10% by weight, the improvement of the effect commensurate with the added amount is not recognized and it is economically disadvantageous. The volume average particle size (r) and the addition amount (α) of the solid compound in the present invention
The relationship is shown in FIG.

【0012】また本発明の対象とする微粉炭は、原炭の
平均HGIが30以上の乾燥した微粉炭である。ここで、
「乾燥した」とはJIS M 8812-1984 で定義される空気中
乾燥減量測定法による水分量が10重量%以下であること
を意味する。水分量の多い微粉炭は冶金炉吹き込み用或
いは燃焼炉用の燃料として不適当である。
The pulverized coal to which the present invention is applied is dry pulverized coal having an average HGI of raw coal of 30 or more. here,
The term "dried" means that the amount of water is 10% by weight or less according to the dry weight loss measurement method defined in JIS M 8812-1984. Pulverized coal with a high water content is not suitable as a fuel for blowing in a metallurgical furnace or a combustion furnace.

【0013】このような原炭の平均HGIが30以上の微
粉炭は搬送性が悪いが、本発明の搬送性向上剤を使用す
ることにより、かかる微粉炭のスムースな輸送が可能と
なった。さらに本発明は、現在の技術では気体輸送が非
常に困難とされている原炭の平均HGI50以上の微粉炭
に対しても効果がある。
Although pulverized coal having an average HGI of 30 or more of such raw coal has poor transportability, the transportability improver of the present invention enables smooth transport of such pulverized coal. Furthermore, the present invention is also effective for pulverized coal having an average HGI50 of 50 or higher for raw coal, which is considered to be extremely difficult to transport by gas using the present technology.

【0014】ここで、「HGI」とは「Hardgro
ve Grinding Index」(粉砕能指数)
の略であり、これはASTM D409で定義される石
炭の粉砕抵抗をあらわす指数である。
Here, "HGI" means "Hardgro"
ve Grinding Index ”(grinding power index)
Which is an index of coal crushing resistance defined in ASTM D409.

【0015】また、体積平均粒子径は、エルゾーン・パ
ーチクルカウンター 180 XY 〔パーチクルデータ社(米
国)製,測定範囲 0.2〜1200μm 〕又はサブミクロンサ
イザー(ブルックヘブン社(米国)製,測定範囲 0.005
〜5μm 〕をそれぞれ適用できる範囲において測定す
る。
The volume average particle diameter is LZONE Particle Counter 180 XY (manufactured by Particle Data Corporation (USA), measuring range 0.2 to 1200 μm) or Submicron Sizer (manufactured by Brookhaven Corporation (USA), measuring range 0.005).
.About.5 .mu.m] in each applicable range.

【0016】また、本発明の搬送性向上剤の添加時期は
原炭の粉砕前でも粉砕後でも同様に効果を発揮する。
Further, the addition of the transportability improver of the present invention exerts the same effect before or after crushing raw coal.

【0017】以下に、本発明の搬送性向上剤となる固体
化合物を例示する。
The solid compounds that serve as the transportability improver of the present invention are exemplified below.

【0018】(1) 金属酸化物 例えば、酸化鉄、酸化チタン、酸化アルミニウム、酸化
銅、酸化亜鉛、酸化カリウム、酸化カルシウム、酸化ス
ズ、酸化ナトリウム、酸化ニッケル、酸化マグネシウ
ム、酸化ジルコニウム、酸化珪素及びこれらの複合酸化
物等が挙げられる。酸化珪素としては、特に二酸化珪素
が良い。二酸化珪素は微粉末として用いることも、また
コロイダルシリカのようなコロイド溶液として用いるこ
ともでき、いずれの場合も本発明の効果が得られる。 (2) 燐酸塩 例えば、燐酸カリウム、燐酸カルシウム、燐酸水素二ナ
トリウム、燐酸鉄、燐酸亜鉛、燐酸マグネシウム、燐酸
二水素カリウム、燐酸二水素ナトリウム及びこれらの複
塩等が挙げられる。 (3) 炭酸塩 例えば、炭酸カリウム、炭酸カリウム、炭酸水素カリウ
ム、炭酸水素ナトリウム、炭酸鉄、炭酸銅、炭酸ナトリ
ウム、炭酸鉛、炭酸ニッケル、炭酸マグネシウム、炭酸
マンガン及びこれらの複塩等が挙げられる。 (4) 珪酸塩 例えば、珪酸アルミニウム、珪酸鉄、珪酸カルシウム、
珪酸マグネシウム、珪酸カリウム、珪酸ナトリウム及び
これらの複塩等が挙げられる。 (5) 窒化物 例えば、窒化アルミニウム、窒化珪素、窒化ホウ素、窒
化マグネシウム等が挙げられる。 (6) 珪化物 例えば、珪化マグネシウム、珪化カルシウム、珪化鉄、
珪化カリウム等が挙げられる。 (7) 炭化物 例えば、炭化アルミニウム、炭化カルシウム、炭化シリ
カ、炭化鉄、炭化ナトリウム等が挙げられる。 (8) 粘土鉱物 粘土鉱物は粘土を構成する主成分鉱物であり、例えばセ
リサイト、タルク、マイカ、ベントナイト、カオリナイ
ト、ハロイサイト、モンモリロナイト、イライト、マー
ミキュライト、緑泥石及びこれらの熱処理物等が挙げら
れる。また、石炭中の粘土鉱物に由来するヒューム等も
好ましい。
(1) Metal oxides For example, iron oxide, titanium oxide, aluminum oxide, copper oxide, zinc oxide, potassium oxide, calcium oxide, tin oxide, sodium oxide, nickel oxide, magnesium oxide, zirconium oxide, silicon oxide and These complex oxides etc. are mentioned. Silicon dioxide is particularly preferable as silicon oxide. Silicon dioxide can be used as a fine powder or as a colloidal solution such as colloidal silica, and in any case, the effect of the present invention can be obtained. (2) Phosphate salts For example, potassium phosphate, calcium phosphate, disodium hydrogen phosphate, iron phosphate, zinc phosphate, magnesium phosphate, potassium dihydrogen phosphate, sodium dihydrogen phosphate and double salts thereof and the like can be mentioned. (3) Carbonates For example, potassium carbonate, potassium carbonate, potassium hydrogen carbonate, sodium hydrogen carbonate, iron carbonate, copper carbonate, sodium carbonate, lead carbonate, nickel carbonate, magnesium carbonate, manganese carbonate, and double salts thereof can be mentioned. . (4) Silicates For example, aluminum silicate, iron silicate, calcium silicate,
Examples thereof include magnesium silicate, potassium silicate, sodium silicate, and double salts thereof. (5) Nitride Examples include aluminum nitride, silicon nitride, boron nitride, and magnesium nitride. (6) Silicide For example, magnesium silicide, calcium silicide, iron silicide,
Examples thereof include potassium silicide. (7) Carbide Examples include aluminum carbide, calcium carbide, silica carbide, iron carbide, and sodium carbide. (8) Clay Minerals Clay minerals are the main constituent minerals that make up clay, such as sericite, talc, mica, bentonite, kaolinite, halloysite, montmorillonite, illite, marmiculite, chlorite and heat-treated products thereof. Can be mentioned. Further, fumes derived from clay minerals in coal are also preferable.

【0019】(9) ダスト ここで、ダストとは、大気汚染防止法に規定されるばい
煙から電気集塵機等により捕集された固体化合物をい
う。具体的には、微粉炭燃焼ボイラー、重油燃焼ボイラ
ー、転炉等から排出されるばい煙から捕集されたダスト
が挙げられる。
(9) Dust Here, the dust means a solid compound collected from soot and smoke specified by the Air Pollution Control Act by an electric dust collector or the like. Specific examples include dust collected from pulverized coal combustion boilers, heavy oil combustion boilers, soot and smoke discharged from converters and the like.

【0020】また、(1) 〜(9) で示された無機固体化合
物を各種のイオン性界面活性剤或いは脂肪酸塩等で示さ
れる水溶性極性有機化合物と併用しても好ましい結果を
得ることができる。
Also, the inorganic solid compounds represented by (1) to (9) may be used in combination with a water-soluble polar organic compound represented by various ionic surfactants or fatty acid salts to obtain preferable results. it can.

【0021】微粉炭の搬送性の指標としては、後述の実
施例で詳細に記載した流動性指数と配管輸送テストの圧
力損失を用いた。流動性指数はホッパー等での排出特性
を、また圧力損失は気体輸送中の配管内での流動特性を
それぞれシミュレートすることができる。搬送性向上の
目安は流動性指数は3ポイント以上の向上、圧力損失は
3mmH2O /m 以上減少することが必要である。また非常
に搬送性の悪い微粉炭に対しては、流動性指数は40以
上、圧力損失は16mmH2O /m 以下にする必要がある。
As indexes of the transportability of the pulverized coal, the fluidity index and the pressure loss in the pipe transportation test described in detail in Examples described later were used. The fluidity index can simulate discharge characteristics in a hopper and the like, and the pressure loss can simulate flow characteristics in a pipe during gas transportation. To improve transportability, it is necessary to improve the fluidity index by 3 points or more and reduce the pressure loss by 3 mmH 2 O / m or more. For pulverized coal, which has extremely poor transportability, the fluidity index must be 40 or more and the pressure loss must be 16 mmH 2 O / m or less.

【0022】本発明の対象となる冶金炉、燃焼炉として
は、微粉炭を燃料及び/又は還元剤として使用する炉
(高炉、キュポラ、ロータリーキルン、溶融還元炉、冷
鉄源溶解炉、ボイラー等)や、微粉炭を使用する乾留装
置(例えば流動層乾留炉、ガス改質炉等)等である。
As a metallurgical furnace and a combustion furnace to which the present invention is applied, a furnace using pulverized coal as a fuel and / or a reducing agent (blast furnace, cupola, rotary kiln, smelting reduction furnace, cold iron source melting furnace, boiler, etc.) And a carbonization device using pulverized coal (for example, fluidized bed carbonization furnace, gas reforming furnace, etc.).

【0023】[0023]

【発明の効果】本発明によれば、原炭の平均HGIが30
以上の微粉炭の搬送性が改良され、かかる微粉炭の多量
輸送が達成できる。また、搬送性の良くない石炭に本発
明の搬送性向上剤を添加することにより、搬送性を改良
でき、多量輸送できるため、微粉炭吹き込みに使用する
ことができる石炭種が拡大できる。
According to the present invention, the average HGI of raw coal is 30.
The transportability of the above pulverized coal is improved, and a large amount of transportation of such pulverized coal can be achieved. Further, by adding the transportability improver of the present invention to coal having poor transportability, the transportability can be improved and a large amount can be transported, so that the types of coal that can be used for blowing pulverized coal can be expanded.

【0024】同時に、本発明の搬送性向上剤により処理
された吹き込み口から吹き込むべき微粉炭は流動性の良
い状態が実現されているので、ホッパー内での棚吊りも
防止でき、更に、ホッパーからの切り出し量の時間的変
化や分配量の偏差も大きく緩和できる。
At the same time, since the pulverized coal to be blown from the blowing port treated with the transportability improving agent of the present invention has a good fluidity, it is possible to prevent hanging in the hopper, and further, from the hopper. It is possible to greatly reduce the temporal change in the cutout amount and the deviation of the distribution amount.

【0025】[0025]

【実施例】以下実施例にて本発明を説明するが、本発明
はこれらの実施例に限定されるものではない。
EXAMPLES The present invention will be described below with reference to examples, but the present invention is not limited to these examples.

【0026】実施例1〜45及び比較例1〜17 〔1〕原炭の粉砕及び評価用微粉炭の調整 原炭の粉砕及び流動性向上剤の添加は以下の手順で行っ
た。 表1〜5に示す原炭と流動性向上剤を粉砕機〔小型粉
砕機SCM-40A (石崎電気製作所製)〕に入れ、粉砕・混
合し、必要粒子径となるような粉砕時間で調整する。そ
の際、流動性向上剤は、微粉炭に対する添加量が表中に
示す量となるように原炭を粉砕しながら添加する。 105℃で1時間乾燥し、微粉炭中の水分が 0.5〜1.0
%となるように調整する。 106μm のふるいにかけ、粒子径106 μm 以下の微粉
炭を得た。微粉炭中の水分量(0.5〜1.0 %) 、体積平均
粒子径(75μm )は全て同一に調整した。 ここで体積平均粒子径は次式で定義されるものであ
る。
Examples 1 to 45 and Comparative Examples 1 to 17 [1] Crushing of Raw Coal and Adjustment of Pulverized Coal for Evaluation Crushing of raw coal and addition of a fluidity improver were carried out by the following procedure. The raw coal and the fluidity improver shown in Tables 1 to 5 are put into a crusher [Small crusher SCM-40A (manufactured by Ishizaki Denki Seisakusho)], crushed and mixed, and adjusted with a crushing time to obtain a required particle size. . At that time, the fluidity improver is added while crushing the raw coal so that the amount added to the pulverized coal is the amount shown in the table. It is dried at 105 ℃ for 1 hour, and the water content in the pulverized coal is 0.5 to 1.0.
Adjust to be%. After sieving through a 106 μm sieve, pulverized coal having a particle size of 106 μm or less was obtained. The water content (0.5 to 1.0%) and volume average particle diameter (75 μm) in the pulverized coal were all adjusted to be the same. Here, the volume average particle diameter is defined by the following equation.

【0027】[0027]

【数1】 [Equation 1]

【0028】〔2〕微粉炭搬送性向上剤 本例で使用した搬送性向上剤を以下に示す。 ・二酸化珪素:試薬特級 ・コロイダルシリカ:水澤化学工業 (株) 製 RM-5 ・酸化アルミニウム:試薬特級 ・酸化チタン:試薬特級 ・酸化ジルコニウム:試薬特級 ・燐酸カルシウム:試薬特級 ・炭酸カルシウム:試薬特級 ・炭酸マグネシウム:試薬特級 ・珪酸アルミニウム:試薬特級 ・炭化珪素:試薬特級 ・窒化珪素:試薬特級 ・セリサイト ・タルク ・マイカ ・ベントナイト ・微粉炭燃焼ボイラーダスト(シリカヒューム): 微粉炭燃焼ボイラーから排出されるばい煙からマルチサ
イクロンを前段に配置した電気集塵装置で捕集したダス
ト。体積平均粒子径1.0 μm ・重油燃焼ボイラーダスト: 重油燃焼ボイラーから排出されるばい煙からマルチサイ
クロンを前段に配置した電気集塵装置で捕集したダス
ト。体積平均粒子径0.12μm ・転炉ダスト: 転炉から排出されるばい煙からマルチサイクロンを前段
に配置した電気集塵装置で捕集したダスト。体積平均粒
子径0.21μm 上記化合物中、コロイダルシリカ以外は重力、慣性力、
遠心力、濾過、電気集塵機により、粒子径を所定の値に
揃えた。
[2] Pulverized coal transportability improving agent The transportability improving agent used in this example is shown below.・ Silicon dioxide: Reagent special grade ・ Colloidal silica: Mizusawa Chemical Co., Ltd. RM-5 ・ Aluminum oxide: Reagent special grade ・ Titanium oxide: Reagent special grade ・ Zirconium oxide: Reagent special grade ・ Calcium phosphate: Reagent special grade ・ Calcium carbonate: Reagent special grade・ Magnesium carbonate: Special grade of reagent ・ Aluminum silicate: Special grade of reagent ・ Silicon carbide: Special grade of reagent ・ Silicon nitride: Special grade of reagent ・ Serisite ・ Talc ・ Mica ・ Bentonite ・ Pulverized coal combustion boiler dust (Silica fume): Emission from pulverized coal combustion boiler Dust collected from the soot and smoke that is collected by an electric precipitator equipped with a multi-cyclone in the preceding stage. Volume average particle size 1.0 μm ・ Heavy oil combustion boiler dust: Dust collected from the soot and smoke emitted from the heavy oil combustion boiler by an electrostatic precipitator equipped with a multi-cyclone in the preceding stage. Volume average particle size 0.12 μm ・ Converter dust: Dust collected from the soot and smoke emitted from the converter by an electric dust collector with a multi-cyclone in the previous stage. Volume average particle diameter 0.21 μm In the above compounds, except for colloidal silica, gravity, inertial force,
The particle size was adjusted to a predetermined value by centrifugal force, filtration, and an electrostatic precipitator.

【0029】〔3〕微粉炭の評価 このようにして得た微粉炭の流動性指数、配管輸送特性
に対する添加剤の効果を以下の方法で調べた。
[3] Evaluation of Pulverized Coal The effects of the additives on the fluidity index and pipe transportation characteristics of the pulverized coal thus obtained were examined by the following method.

【0030】<流動性指数測定方法>流動性指数とは粉
体の流動性を評価するための指数であり、粉体の4つの
因子(安息角、圧縮度、スパチュラ角、凝集度)を指数
化し、その各指数の総和から求めるものである。各因子
の測定方法および指数については、その詳細が「粉体工
学便覧」(粉体工学会編、1987年日刊工業発行)の 151
〜152 頁に記載されている。なお、各因子の測定方法を
以下に記載する。 1.安息角:粉体を標準ふるい(25mesh)に通し、さら
に漏斗を介して直径8mmの円板上に注入し、形成された
堆積層の傾斜角を測定する。 2.圧縮度:粉体を充填するための円筒容器(容積100c
m3)を用いて、疎充填の状態のかさ密度ρs (g/c
m3 )とタッピングを一定回数(180 回)行った後の密
充填密度ρc(g/cm3)とから圧縮度ψ(%)を次式に
より求める。 ψ=(ρc−ρs)×100/ρc (%) 3.スパチュラ角:堆積した粉体中に一定幅(22mm)の
スパチュラ(へら)を差し込み、これを持ち上げて上に
載った粉体の傾斜角を測定する。次にスパチュラに軽い
衝撃を与え、再びこの角度を測定し、この二つの平均値
をスパチュラ角とする。 4.凝集度:3種類の目開きの異なるふるい(各ふるい
は上段より60, 100, 200mesh)を重ね、最上段に粉体を
2g載せ、次にこれらを同時に振動させ、振動停止後に
各ふるいに残った量を秤量して、 (上段ふるいの粉体の量/2g)×100 、 (中段ふるいの粉体の量/2g)×100 ×3/5、及び (下段ふるいの粉体の量/2g)×100 ×1/5 の三つの計算値を合計することにより求める。なお、本
発明で用いるような微粉炭の場合は、各ふるいに残る微
粉炭の量に差がなく、凝集度比較の意味がないため、本
発明においては、安息角、圧縮度、スパチュラ角の3つ
の合計点から流動性指数の評価を行なった。
<Flowability Index Measuring Method> The fluidity index is an index for evaluating the fluidity of the powder, and the four factors of the powder (repose angle, compressibility, spatula angle, cohesion degree) are indexes. It is obtained from the sum of each index. For details on the measurement method and index of each factor, refer to 151 of “Powder Engineering Handbook” (edited by Japan Society of Powder Engineering, published by Nikkan Kogyo in 1987).
~ Page 152. In addition, the measuring method of each factor is described below. 1. Angle of repose: The powder is passed through a standard sieve (25 mesh) and further injected through a funnel onto a disk having a diameter of 8 mm, and the inclination angle of the formed sedimentary layer is measured. 2. Compressibility: Cylindrical container for filling powder (volume 100c
m 3 ), the bulk density ρ s (g / c
m 3 ) and the dense packing density ρ c (g / cm 3 ) after tapping is performed a certain number of times (180 times), the compression degree ψ (%) is calculated by the following formula. ψ = (ρ c −ρ s ) × 100 / ρ c (%) 3. Spatula angle: A spatula (spatula) with a constant width (22 mm) is inserted into the accumulated powder, and the spatula is lifted and the inclination angle of the powder placed on the spatula is measured. Next, a slight impact is applied to the spatula, this angle is measured again, and the average value of these two is taken as the spatula angle. 4. Cohesion degree: Three kinds of sieves with different openings (60, 100, 200 mesh from each upper sieve) are piled up, 2 g of powder is placed on the uppermost row, and then these are vibrated at the same time, and left on each sieve after vibration is stopped. Weighing the amount of powder, (amount of powder in the upper sieve / 2g) × 100, (amount of powder in the intermediate sieve / 2g) × 100 × 3/5, and (amount of powder in the lower sieve / 2g) ) × 100 × 1/5 is calculated by summing the three calculated values. Incidentally, in the case of pulverized coal as used in the present invention, there is no difference in the amount of pulverized coal remaining in each sieve, there is no meaning of the degree of aggregation comparison, in the present invention, the angle of repose, the degree of compression, the spatula angle of The liquidity index was evaluated from the three total points.

【0031】<配管輸送特性測定方法>「CAMP−I
SIJ Vol.6」(1993)の91頁で詳細に説明され
ている方法に準じ、図2の装置で圧力損失を測定するこ
とにより配管輸送特性を評価した。図2中、1は微粉
炭、2はテーブルフィーダー、3は流量計、4は管径1
2.7mmの水平管、5はサイクロンを意味する。本装置
は、粉体フィーダ8より排出される微粉炭7を、搬送ガ
スにより気体輸送し圧力測定孔(P1 ,P2 )間での圧
力損失を測定するものである。実験条件は以下の条件で
行った。 微粉炭供給量 0.8 kg/min 搬送ガス 窒素(N2) 搬送ガス量 4Nm3 /h(67リットル/min ) 輸送時間 6分間 評価は次の項目である。 1.圧力損失 圧力計P1 ,P2 では500Hz でデータのサンプリングを
行っている。圧力損失は、輸送時間中(6分間)のP1
−P2の全平均で与えられる。
<Piping Transport Characteristic Measuring Method>"CAMP-I
SIJ Vol. 6 ”(1993), page 91, in accordance with the method described in detail, the pipe transportation characteristics were evaluated by measuring the pressure loss with the apparatus of FIG. 2, 1 is pulverized coal, 2 is a table feeder, 3 is a flow meter, 4 is a pipe diameter 1
2.7mm horizontal tube, 5 means cyclone. This device measures the pressure loss between the pressure measurement holes (P 1 , P 2 ) by transporting the pulverized coal 7 discharged from the powder feeder 8 by a carrier gas. The experimental conditions were as follows. Pulverized coal supply rate 0.8 kg / min Carrier gas Nitrogen (N 2 ) Carrier gas amount 4 Nm 3 / h (67 liters / min) Transport time 6 minutes Evaluation is as follows. 1. Pressure Loss The pressure gauges P 1 and P 2 sample data at 500 Hz. The pressure loss is P 1 during the transportation time (6 minutes).
Given by the overall average of P 2 .

【0032】[0032]

【数2】 [Equation 2]

【0033】これらの結果を表1〜5に示す。なお、流
動性指数及び圧力損失は、搬送性向上剤を添加しない比
較例4に対してどの程度増加或いは減少したかも併せて
示した。
The results are shown in Tables 1-5. In addition, it is also shown how much the fluidity index and the pressure loss increased or decreased as compared with Comparative Example 4 in which the transportability improver was not added.

【0034】[0034]

【表1】 [Table 1]

【0035】[0035]

【表2】 [Table 2]

【0036】[0036]

【表3】 [Table 3]

【0037】[0037]

【表4】 [Table 4]

【0038】[0038]

【表5】 [Table 5]

【0039】実施例46 高炉微粉炭吹込装置への適用例を以下に示す。 条 件 微粉炭吹込量: 40 t/Hr 搬送性向上剤:二酸化珪素(体積平均粒子径5μm 以下
の粒子が80%を占めるもの) 添加量:0又は1.0体積% 微粉炭:体積平均粒子径…74μm 水 分…1.5 % 原炭の平均HGI…45,55,70 本実施例で用いた高炉微粉炭吹込装置の概略図を図3に
示す。図3において、6は高炉、7は吹込口、8は吹込
配管、9は分配タンク、10はバルブ、11は均圧タンク、
12はバルブ、13は微粉炭貯蔵タンク、14は石炭粉砕機、
15は添加剤噴霧ノズル、16は石炭搬送ベルトコンベア、
17は石炭受入ホッパ、18は空気・窒素圧縮機を意味す
る。
Example 46 An example of application to a blast furnace pulverized coal blowing device is shown below. Condition Pulverized coal injection: 40 t / Hr Transportability improver: Silicon dioxide (80% of particles with a volume average particle diameter of 5 μm or less) Addition amount: 0 or 1.0 volume% Pulverized coal: Volume average particle diameter ... 74 μm water content ... 1.5% of raw coal average HGI ... 45, 55, 70 A schematic view of the blast furnace pulverized coal blowing device used in this example is shown in FIG. In FIG. 3, 6 is a blast furnace, 7 is a blowing port, 8 is a blowing pipe, 9 is a distribution tank, 10 is a valve, 11 is a pressure equalizing tank,
12 is a valve, 13 is a pulverized coal storage tank, 14 is a coal crusher,
15 is an additive spray nozzle, 16 is a coal conveyor belt conveyor,
17 is a coal receiving hopper and 18 is an air / nitrogen compressor.

【0040】石炭は、受け入れホッパ17に投入されコン
ベア16により粉砕機14へ供給される。その途中において
ノズル15より搬送性向上剤を噴霧添加する。粉砕機14で
石炭は上記の粒子径の微粉炭に粉砕され、貯蔵タンク13
へ送られる。まず、均圧タンク11の内圧が大気圧と等し
い状態でバルブ12が開き、貯蔵タンク13より規定量の微
粉炭が均圧タンク11へ供給される。次に均圧タンク11の
内圧を分配タンク9と同じ内圧になるまで加圧する。タ
ンク9と11の内圧が等しい状態で、バルブ10が開き微粉
炭が重力落下する。微粉炭は分配タンク9から吹込口7
へ吹込配管8を介し、圧縮機18より供給される吹込空気
によって気体輸送され、吹込口7より高炉6内へ吹き込
まれる。
The coal is put into the receiving hopper 17 and supplied to the crusher 14 by the conveyor 16. In the middle of the process, the transportability improver is spray-added from the nozzle 15. Coal is crushed by the crusher 14 into pulverized coal having the above-mentioned particle size, and stored in the storage tank 13
Sent to First, the valve 12 is opened in a state where the internal pressure of the pressure equalizing tank 11 is equal to the atmospheric pressure, and a specified amount of pulverized coal is supplied from the storage tank 13 to the pressure equalizing tank 11. Next, the internal pressure of the pressure equalizing tank 11 is increased to the same internal pressure as the distribution tank 9. With the internal pressures of the tanks 9 and 11 equal, the valve 10 opens and the pulverized coal falls by gravity. Pulverized coal from the distribution tank 9 to the injection port 7
The gas is transported by blowing air supplied from the compressor 18 through the blowing pipe 8 and blown into the blast furnace 6 through the blowing port 7.

【0041】<搬送性向上剤添加の効果>上記の条件で
微粉炭の搬送を行ったときの、搬送性向上剤添加の有無
によるタンク移送時間(タンク11からタンク9へ微粉炭
を移送するのに要する時間)と配管圧損(吹込配管14で
の圧力損失、即ちタンク9と高炉6との差圧)の変化を
評価した。その結果を図4,5及び6に示す。図4,5
中、(イ)は搬送性向上剤無添加の場合、(ロ)は搬送
性向上剤を添加した場合を意味し、また図6中、Aは設
備上限の値を意味する。
<Effect of Addition of Transportability Improving Agent> When the pulverized coal is conveyed under the above conditions, the tank transfer time (whether the pulverized coal is transferred from the tank 11 to the tank 9 depending on the presence or absence of the addition of the transportability improving agent Time) and the pipe pressure loss (pressure loss in the blow pipe 14, that is, the differential pressure between the tank 9 and the blast furnace 6) were evaluated. The results are shown in FIGS. 4, 5 and 6. Figures 4 and 5
In the figure, (a) means the case where the transportability improver is not added, (b) means the case where the transportability improver is added, and in FIG. 6, A means the upper limit value of the equipment.

【0042】平均HGIが45の原炭使用時は、図4,図
5にみられるように配管圧損およびタンク移送時間が低
減され、同一装置での微粉炭吹込量の増加が可能になっ
た。また、同一吹込能力を得るためにより簡便な装置で
済むようになった。なお、図4,5はいずれも搬送性向
上剤を添加しない場合を1とする相対評価である。
When raw coal having an average HGI of 45 was used, as shown in FIGS. 4 and 5, pipe pressure loss and tank transfer time were reduced, and the amount of pulverized coal injected in the same apparatus could be increased. Also, a simpler device is required to obtain the same blowing ability. Note that FIGS. 4 and 5 are relative evaluations in which the case where the transportability improver is not added is set to 1.

【0043】また、原炭の平均HGIを45,55,70と変
更した場合の配管圧損の変化を図6に示す。搬送性向上
剤添加により高HGI石炭使用でも配管圧損が設備上限
以下となり、使用石炭の炭種拡大が可能になり安価な石
炭を使用出来る。なお、図6は平均HGIが45の微粉炭
に搬送性向上剤を添加しない場合を1とする相対評価で
ある。
FIG. 6 shows the change in pipe pressure loss when the average HGI of raw coal was changed to 45, 55 and 70. Even if high HGI coal is used, the pipe pressure loss becomes less than the facility upper limit by the addition of the transportability improver, the coal types of the coal used can be expanded, and inexpensive coal can be used. In addition, FIG. 6 is a relative evaluation with 1 when the transportability improver is not added to pulverized coal having an average HGI of 45.

【0044】実施例47 微粉炭焚きボイラーへの適用例を以下に示す。 搬送性向上剤:二酸化珪素(体積平均粒子径5μm 以下
の粒子が80%を占めるもの) 添加量:0又は1.0体積% 微粉炭:体積平均粒子径…74μm 水 分…1.5 % 原炭の平均HGI…45,55,65,75 本実施例で用いた微粉炭焚きボイラーの概略図を図7に
示す。図7において、19はボイラ燃焼室、20はバーナ
ー、21は吹き込み配管、22は微粉炭貯蔵タンク、23は石
炭粉砕機、24は添加剤噴霧ノズル、25は石炭搬送ベルト
コンベア、26は石炭受入ホッパ、27は空気・窒素圧縮機
を意味する。
Example 47 An example of application to a pulverized coal burning boiler is shown below. Transportability improver: Silicon dioxide (80% of particles with a volume average particle size of 5 μm or less) Addition amount: 0 or 1.0% by volume Pulverized coal: Volume average particle size… 74 μm Water content… 1.5% Average HGI of raw coal … 45, 55, 65, 75 A schematic view of the pulverized coal burning boiler used in this example is shown in FIG. 7. In FIG. 7, 19 is a boiler combustion chamber, 20 is a burner, 21 is a blowing pipe, 22 is a pulverized coal storage tank, 23 is a coal crusher, 24 is an additive spray nozzle, 25 is a coal conveying belt conveyor, and 26 is coal receiving. Hopper, 27 means an air / nitrogen compressor.

【0045】石炭は、受け入れホッパ26に投入されコン
ベア25により粉砕機23へ供給される。その途中において
ノズル24より搬送性向上剤を噴霧添加する。粉砕機23で
石炭は上記の粒子径の微粉炭に粉砕され、貯蔵タンク22
へ送られる。次いで圧縮機27より供給される吹込空気に
よって気流搬送され、バーナー20に供給され燃焼され
る。
The coal is put into the receiving hopper 26 and supplied to the crusher 23 by the conveyor 25. On the way, a transportability improver is spray-added from the nozzle 24. The pulverizer 23 pulverizes the coal into pulverized coal having the above particle size, and the storage tank 22
Sent to Next, the air is conveyed by the blown air supplied from the compressor 27, and is supplied to the burner 20 and burned.

【0046】<搬送性向上剤添加の効果>上記の条件で
微粉炭の搬送を行ったときの、搬送性向上剤添加の有無
による配管圧損(吹込配管27での圧力損失、即ちタンク
22とバーナー20との差圧)の変化を評価した。その結果
を図8に示すが、図8中、Aは設備上限の値を意味し、
×は配管閉塞が起こったことを意味する。なお、図8は
原炭の平均HGIが45の微粉炭に搬送性向上剤を添加し
ない場合を1とする相対評価である。
<Effect of Addition of Transportability Improver> When pulverized coal is transported under the above conditions, pipe pressure loss (pressure loss in the blowing pipe 27, that is, tank
The change in differential pressure between 22 and burner 20) was evaluated. The result is shown in FIG. 8, where A means the value of the equipment upper limit,
× means that the pipe was blocked. In addition, FIG. 8 is a relative evaluation with 1 being the case where the transportability improver is not added to pulverized coal having an average HGI of 45 of raw coal.

【0047】原炭の平均HGIを45,55,65,75と変更
した場合、搬送性向上剤添加により高HGI石炭使用で
も配管圧損が設備上限以下となり、使用石炭の炭種拡大
ができた。
When the average HGI of raw coal was changed to 45, 55, 65, and 75, the pipe pressure loss was less than the upper limit of the equipment even when high HGI coal was used due to the addition of the transportability improver, and the coal types used could be expanded.

【図面の簡単な説明】[Brief description of drawings]

【図1】固体化合物の体積平均粒子径と添加量の関係を
示す図
FIG. 1 is a diagram showing the relationship between the volume average particle diameter of a solid compound and the amount added.

【図2】配管輸送特性の測定に用いる装置の概略図FIG. 2 is a schematic diagram of an apparatus used for measuring pipe transportation characteristics.

【図3】実施例46で用いた実機高炉微粉炭吹込装置の概
略図
FIG. 3 is a schematic view of an actual blast furnace pulverized coal blowing device used in Example 46.

【図4】実施例46における移送時間の結果を示すチャー
FIG. 4 is a chart showing the results of transfer time in Example 46.

【図5】実施例46における配管圧損の結果を示すチャー
FIG. 5 is a chart showing the results of pipe pressure loss in Example 46.

【図6】実施例46における配管圧損の結果を示すチャー
FIG. 6 is a chart showing the results of pipe pressure loss in Example 46.

【図7】実施例47で用いた微粉炭焚きボイラーの概略図FIG. 7 is a schematic view of a pulverized coal burning boiler used in Example 47.

【図8】実施例47における配管圧損の結果を示すチャー
FIG. 8 is a chart showing the results of pipe pressure loss in Example 47.

【符号の説明】[Explanation of symbols]

1:微粉炭 2:テーブルフィーダー 3:流量計 4:水平管 5:サイクロン 6:高炉 19:ボイラ燃焼室 20:バーナー 1: Pulverized coal 2: Table feeder 3: Flow meter 4: Horizontal pipe 5: Cyclone 6: Blast furnace 19: Boiler combustion chamber 20: Burner

───────────────────────────────────────────────────── フロントページの続き (72)発明者 宮本 健一 和歌山県和歌山市湊1334 花王株式会社研 究所内 (72)発明者 的場 隆志 和歌山県和歌山市湊1334 花王株式会社研 究所内 (72)発明者 市本 武彦 和歌山県和歌山市湊1334 花王株式会社研 究所内 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Kenichi Miyamoto, 1334 Minato Minato, Wakayama City, Wakayama Prefecture, Research Laboratory (72) Inventor Takashi Matoba, 1334, Minato, Wakayama City, Wakayama Prefecture (72) Invention, Kao Corporation Takehiko Ichimoto 1334 Minato Minato, Wakayama City, Wakayama Prefecture Kao Corporation Research Laboratory

Claims (15)

【特許請求の範囲】[Claims] 【請求項1】 原炭の平均HGIが30以上の乾燥した微
粉炭の搬送性を向上させる方法であって、体積平均粒子
径が5μm 以下の固体化合物を、下式のα(体積%)で
示される量、前記微粉炭に添加し当該微粉炭の表面に付
着させることを特徴とする微粉炭の搬送性向上方法。 k1・r0.59≦α≦10(体積%) 〔ここで、k1=10-1.42、rは添加する固体化合物の体
積平均粒子径 (μm)である。〕
1. A method for improving the transportability of dried pulverized coal having an average HGI of raw coal of 30 or more, wherein a solid compound having a volume average particle size of 5 μm or less is expressed by α (volume%) of the following formula. A method for improving the transportability of pulverized coal, which comprises adding the indicated amount to the pulverized coal and attaching it to the surface of the pulverized coal. k 1 · r 0.59 ≦ α ≦ 10 (volume%) [where k 1 = 10 −1.42 and r is the volume average particle diameter (μm) of the solid compound to be added. ]
【請求項2】 前記微粉炭の原炭の平均HGIが50以上
である請求項2記載の微粉炭の搬送性向上方法。
2. The method for improving the transportability of pulverized coal according to claim 2, wherein the raw coal of the pulverized coal has an average HGI of 50 or more.
【請求項3】 前記固体化合物が、金属酸化物、燐酸
塩、炭酸塩、珪酸塩、窒化物、珪化物、炭化物及び粘土
鉱物から選ばれる1種または2種以上である請求項1又
は2記載の微粉炭の搬送性向上方法。
3. The solid compound is one or more selected from metal oxides, phosphates, carbonates, silicates, nitrides, silicides, carbides and clay minerals. Method for improving pulverized coal transportability.
【請求項4】 前記固体化合物が、二酸化珪素微粉末で
ある請求項1〜3の何れか1項記載の微粉炭の搬送性向
上方法。
4. The method for improving the transportability of pulverized coal according to claim 1, wherein the solid compound is silicon dioxide fine powder.
【請求項5】 請求項1〜4の何れか1項記載の微粉炭
の搬送性向上方法に使用される微粉炭搬送性向上剤であ
って、金属酸化物、燐酸塩、炭酸塩、珪酸塩、窒化物、
珪化物、炭化物及び粘土鉱物から選ばれる体積平均粒子
径が5μm 以下の固体化合物の1種または2種以上から
なる微粉炭搬送性向上剤。
5. A pulverized coal transportability improver used in the method for improving the transportability of pulverized coal according to claim 1, which is a metal oxide, a phosphate, a carbonate or a silicate. , Nitride,
A pulverized coal transportability improver comprising one or more solid compounds having a volume average particle size of 5 μm or less selected from silicides, carbides and clay minerals.
【請求項6】 前記固体化合物が二酸化珪素微粉末であ
る請求項5記載の微粉炭搬送性向上剤。
6. The pulverized coal transportability improving agent according to claim 5, wherein the solid compound is silicon dioxide fine powder.
【請求項7】 体積平均粒子径が5μm 以下の固体化合
物を、下式のα(体積%)で示される量、原炭の平均H
GIが30以上の乾燥した微粉炭の表面に付着させてなる
微粉炭。 k1・r0.59≦α≦10(体積%) 〔ここで、k1=10-1.42、rは添加する固体化合物の体
積平均粒子径 (μm)である。〕
7. A solid compound having a volume average particle size of 5 μm or less, in an amount represented by α (volume%) in the following formula, and an average H of raw coal.
Pulverized coal formed by adhering to the surface of dry pulverized coal with GI of 30 or more. k 1 · r 0.59 ≦ α ≦ 10 (volume%) [where k 1 = 10 −1.42 and r is the volume average particle diameter (μm) of the solid compound to be added. ]
【請求項8】 原炭の平均HGIが50以上である請求項
7記載の微粉炭。
8. The pulverized coal according to claim 7, wherein the average HGI of the raw coal is 50 or more.
【請求項9】 前記固体化合物が、金属酸化物、燐酸
塩、炭酸塩、珪酸塩、窒化物、珪化物、炭化物及び粘土
鉱物から選ばれる1種または2種以上である請求項7又
は8記載の微粉炭。
9. The solid compound is one or more selected from metal oxides, phosphates, carbonates, silicates, nitrides, silicides, carbides and clay minerals. Pulverized coal.
【請求項10】 前記固体化合物が二酸化珪素微粉末で
ある請求項7〜9の何れか1項記載の微粉炭。
10. The pulverized coal according to claim 7, wherein the solid compound is silicon dioxide fine powder.
【請求項11】 体積平均粒子径が5μm 以下の固体化
合物を、下式のα(体積%)で示される量、原炭の平均
HGIが30以上の乾燥した微粉炭の表面に付着させてな
る微粉炭を、吹き込み口から吹き込むことを特徴とする
治金炉又は燃焼炉の操業方法。 k1・r0.59≦α≦10(体積%) 〔ここで、k1=10-1.42、rは添加する固体化合物の体
積平均粒子径 (μm)である。〕
11. A solid compound having a volume average particle diameter of 5 μm or less is adhered to the surface of dry pulverized coal having an average HGI of raw coal of 30 or more in an amount represented by α (volume%) in the following formula. A method for operating a metallurgical furnace or a combustion furnace, characterized in that pulverized coal is blown from a blowing port. k 1 · r 0.59 ≦ α ≦ 10 (volume%) [where k 1 = 10 −1.42 and r is the volume average particle diameter (μm) of the solid compound to be added. ]
【請求項12】 前記微粉炭の原炭の平均HGIが50以
上である請求項11記載の治金炉又は燃焼炉の操業方法。
12. The method of operating a metallurgical furnace or a combustion furnace according to claim 11, wherein the average HGI of the raw coal of the pulverized coal is 50 or more.
【請求項13】 前記固体化合物が、金属酸化物、燐酸
塩、炭酸塩、珪酸塩、窒化物、珪化物、炭化物及び粘土
鉱物から選ばれる1種または2種以上である請求項11又
は12記載の治金炉または燃焼炉の操業方法。
13. The solid compound is one or more selected from metal oxides, phosphates, carbonates, silicates, nitrides, silicides, carbides and clay minerals. How to operate a metallurgical furnace or combustion furnace.
【請求項14】 前記固体化合物が二酸化珪素微粉末で
ある請求項11〜13の何れか1項記載の治金炉または燃焼
炉の操業方法。
14. The method for operating a metallurgical furnace or a combustion furnace according to claim 11, wherein the solid compound is silicon dioxide fine powder.
【請求項15】 前記固体化合物がダストである請求項
11又は12記載の治金炉または燃焼炉の操業方法。
15. The solid compound is dust.
The method of operating a metallurgical furnace or a combustion furnace described in 11 or 12.
JP7169821A 1995-07-05 1995-07-05 How to improve the transportability of pulverized coal Expired - Fee Related JP2986717B2 (en)

Priority Applications (5)

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JP7169821A JP2986717B2 (en) 1995-07-05 1995-07-05 How to improve the transportability of pulverized coal
PCT/JP1996/001875 WO1997002363A1 (en) 1995-07-05 1996-07-05 Method for improving conveyability of pulverized coal
KR1019970709915A KR19990028593A (en) 1995-07-05 1996-07-05 How to improve the conveyability of pulverized coal
EP96922245A EP0837143A1 (en) 1995-07-05 1996-07-05 Method for improving conveyability of pulverized coal
CN96196493A CN1194010A (en) 1995-07-05 1996-07-05 Method for improving conveyability of pulverized coal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7169821A JP2986717B2 (en) 1995-07-05 1995-07-05 How to improve the transportability of pulverized coal

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JP5644365B2 (en) * 2009-10-29 2014-12-24 Jfeスチール株式会社 Blast furnace operation method
EP2659213A4 (en) 2010-09-30 2014-10-15 Richard W Bland Coal fine drying method and system
CN106635096A (en) * 2016-12-06 2017-05-10 神雾环保技术股份有限公司 System and method for treating pulverized coal and calcium-based raw material
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WO1997002363A1 (en) 1997-01-23

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