JP2622302B2 - Coal / water slurry production method - Google Patents
Coal / water slurry production methodInfo
- Publication number
- JP2622302B2 JP2622302B2 JP15401390A JP15401390A JP2622302B2 JP 2622302 B2 JP2622302 B2 JP 2622302B2 JP 15401390 A JP15401390 A JP 15401390A JP 15401390 A JP15401390 A JP 15401390A JP 2622302 B2 JP2622302 B2 JP 2622302B2
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- JP
- Japan
- Prior art keywords
- coal
- weight
- slurry
- fine
- water
- 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.)
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Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、特に加圧流動床ボイラ燃焼炉に用いるのに
適した石炭・水スラリの製造方法に関する。Description: TECHNICAL FIELD The present invention relates to a method for producing a coal / water slurry particularly suitable for use in a pressurized fluidized bed boiler combustion furnace.
〔従来の技術〕 加圧流動床ボイラ燃焼炉への石炭および石灰石（脱硫
剤）の供給には、ロックホッパタイプの乾式供給方法を
用いるのが一般的である。[Prior Art] For supplying coal and limestone (desulfurizing agent) to a pressurized fluidized bed boiler combustion furnace, a rock hopper type dry supply method is generally used.
第５図に従来の石炭、石灰石供給装置を示す。この装
置では、石炭供給管１から石炭供給装置２へ供給された
石炭は、ロックホッパ３を経て供給ホッパ４へ供給さ
れ、同供給ホッパ４のフィーダ５によって分配混合器９
へ送られる。一方、石灰石は石灰石供給管６から供給ホ
ッパ７へ供給され、同供給ホッパ７のフィーダ８によっ
て前記分配混合器９へ送られる。分配混合器９内で混合
された石炭と石灰石は、加圧流動床燃焼炉11内へ送ら
れ、同燃焼炉11の流動層において石炭が燃焼し、また、
石灰石は石炭燃焼の結果発生する硫黄酸化物の除去に寄
与し、石炭の燃焼により生じた灰は同燃焼炉11の下部よ
り灰貯蔵タンク12へ排出される。灰の１部を同伴する燃
焼ガスは燃焼炉11よりサイクロン13へ入り、ここでガス
と灰とが分離され、分離された灰は灰貯蔵タンク14へ排
出される。サイクロン13を出る微粒灰を含むガスは、更
に高温脱じん装置15へ導入され、ここでガスと微粒灰が
分離され、分離された微粒灰は灰貯蔵タンク16へ排出さ
れる。17は灰貯蔵タンク16内の灰の排出管である。FIG. 5 shows a conventional coal and limestone supply device. In this apparatus, coal supplied from a coal supply pipe 1 to a coal supply apparatus 2 is supplied to a supply hopper 4 via a lock hopper 3, and is distributed by a feed mixer 5 of the supply hopper 4.
Sent to On the other hand, limestone is supplied from a limestone supply pipe 6 to a supply hopper 7, and is sent to the distribution mixer 9 by a feeder 8 of the supply hopper 7. The coal and limestone mixed in the distribution mixer 9 are sent into a pressurized fluidized bed combustion furnace 11, where the coal is burned in a fluidized bed of the combustion furnace 11, and
Limestone contributes to the removal of sulfur oxides generated as a result of coal combustion, and the ash generated by coal combustion is discharged from the lower part of the combustion furnace 11 to an ash storage tank 12. The combustion gas accompanied by a part of the ash enters the cyclone 13 from the combustion furnace 11, where the gas and the ash are separated, and the separated ash is discharged to the ash storage tank 14. The gas containing fine ash exiting the cyclone 13 is further introduced into a high-temperature dust removing device 15, where the gas and the fine ash are separated, and the separated fine ash is discharged to an ash storage tank 16. Reference numeral 17 denotes an ash discharge pipe in the ash storage tank 16.
第５図に示す従来のロックホッパタイプの乾式供給に
おいては、ホッパの加圧動力が大きく、かつ、弁の切換
操作での摩耗の問題などがあり、コスト高となる欠点が
あった。The conventional dry feed of the lock hopper type shown in FIG. 5 has a drawback that the pressurizing power of the hopper is large, and there is a problem such as abrasion in the switching operation of the valve, resulting in an increase in cost.
本発明は、従来の乾式供給方法に代えて石炭をスラリ
化して供給することにより、前記の従来方法の欠点をな
くすことができる加圧流動床ボイラ燃焼炉等に好適な石
炭・水スラリを製造する方法を提供することを目的とす
るものである。The present invention provides a coal / water slurry suitable for a pressurized fluidized-bed boiler combustion furnace or the like, which can eliminate the drawbacks of the conventional method by converting coal into a slurry instead of the conventional dry supply method. It is intended to provide a method for performing the above.
本発明は次の手段を講じた。 The present invention takes the following measures.
（１）石灰石を含む平均粒径0.3〜3mmの粗粒炭80〜90重
量％と、加圧流動床ボイラ燃焼炉の脱じん装置から排出
される微粒灰20〜10重量％とを、水を添加して撹拌混合
して石炭・水スラリを製造する。(1) 80 to 90% by weight of coarse coal having an average particle size of 0.3 to 3 mm containing limestone and 20 to 10% by weight of fine ash discharged from a dust removal device of a pressurized fluidized bed boiler combustion furnace are mixed with water. Add, stir and mix to produce coal / water slurry.
（２）石灰石を含む平均粒径0.3〜3mmの粗粒炭80〜90重
量％と200メッシュアンダー80〜90％の微粒炭20〜10重
量％とを、水を添加して撹拌混合して石炭・水スラリの
製造をする。(2) 80-90% by weight of coarse coal having an average particle diameter of 0.3-3mm containing limestone and 20-10% by weight of fine coal having a 200 mesh under 80-90% are added with water, and mixed by stirring.・ Production of water slurry.
加圧流動床ボイラ燃焼炉等への石炭供給に当って要求
される石炭・水スラリの性状は、より高濃度の石炭を含
有し、かつ沈降することなく安定なスラリであることで
ある。石炭の高濃度化をはかり、かつ安定なスラリをつ
くるには、粗い粒子と細かい粒子を適当に混合すること
が必要である。The properties of coal / water slurry required for supplying coal to a pressurized fluidized-bed boiler combustion furnace and the like are that the slurry contains a higher concentration of coal and is stable without settling. In order to achieve a high concentration of coal and to produce a stable slurry, it is necessary to appropriately mix coarse and fine particles.
本発明（１）では、石灰石を含む平均粒径0.3〜3mmの
粗粒炭80〜90重量％と、加圧流動床ボイラ燃焼炉の脱じ
ん装置から排出される微粒灰20〜10重量％とを水を添加
して撹拌混合することによって、粗粒炭粒子相互の間隙
に微粒灰が充填されるために空隙率が小さくなり、石炭
濃度が高いスラリが得られる。In the present invention (1), 80 to 90% by weight of coarse coal containing limestone having an average particle diameter of 0.3 to 3 mm, and 20 to 10% by weight of fine ash discharged from a dust removal device of a combustion furnace of a pressurized fluidized bed boiler. Is added to water and agitated and mixed, the gap between the coarse coal particles is filled with fine ash, so that the porosity is reduced and a slurry having a high coal concentration is obtained.
その反面微粒灰の添加率が増加するとスラリの粘度が
上昇し、ポンプ輸送に支障を来たすなどの欠点が生ずる
が、本発明（１）では、前記の粗粒炭と微粒灰との混合
比率を、前記のように、それぞれ80〜90％重量比と20〜
10％重量比とすることによって、高濃度でしかも輸送が
容易なスラリが製造される。On the other hand, when the addition rate of the fine ash increases, the viscosity of the slurry increases, which causes a drawback such as hindering pumping. However, in the present invention (1), the mixing ratio between the coarse coal and the fine ash is reduced. , As mentioned above, 80-90% weight ratio and 20-
By setting the weight ratio to 10%, a slurry having a high concentration and easy transport can be produced.
また、以上のように、粘度の観点からは微粒灰の添加
率が低いことが望ましいが、微粒灰の添加率が10重量％
を下廻ると、スラリ中の粗粒炭が沈降してスラリの安定
性を損うので、本発明（１）における微粒灰の重量％の
下限は10％とした。As described above, from the viewpoint of viscosity, it is desirable that the addition rate of fine ash is low, but the addition rate of fine ash is 10% by weight.
If it is less than, the coarse coal in the slurry sediments and impairs the stability of the slurry, so the lower limit of the weight% of the fine ash in the present invention (1) was set to 10%.
また更に、石炭・水スラリに含まれる石灰石は、石炭
の燃焼によって生ずる硫黄酸化物の除去に寄与する。Furthermore, the limestone contained in the coal / water slurry contributes to the removal of sulfur oxides generated by burning the coal.
本発明（２）では、石灰石を含む平均粒径0.3〜3mmの
粗粒炭80〜90重量％と200メッシュアンダー80〜90％の
微粒炭20〜10重量％とを、水を添加して撹拌混合するこ
とによって粗粒炭粒子間の空隙に微粒炭が充填されるた
め、空隙率が小さくなり、したがって石炭濃度が高いス
ラリが得られる。In the present invention (2), 80 to 90% by weight of coarse coal having an average particle diameter of 0.3 to 3 mm containing limestone and 20 to 10% by weight of fine coal having a 200 mesh under 80 to 90% are added with water and stirred. Since the fine coal is filled in the voids between the coarse coal particles by mixing, the porosity is reduced, and thus a slurry having a high coal concentration is obtained.
その反面微粒炭の添加率を上げると粘度が上昇しポン
プ輸送に支障を来すなどの問題点があるが、本発明
（２）では、前記の粗粒炭と微粒炭の粒径を、前記のよ
うに、それぞれ0.3〜3mmと200メッシュアンダー80〜90
％とし、またそれらの混合率を、それぞれ86〜90重量％
と20〜10重量％に調整することにより、上記のような欠
点をなくし、高濃度でかつポンプ輸送可能なスラリが製
造される。On the other hand, when the addition rate of the fine coal is increased, there is a problem that the viscosity is increased and the pump transportation is hindered. However, in the present invention (2), the particle size of the coarse coal and the fine coal is set to Like 0.3 ~ 3mm and 200 mesh under 80 ~ 90 respectively
%, And their mixing ratios are 86 to 90% by weight, respectively.
By adjusting the amount to 20 to 10% by weight, the above-mentioned disadvantages are eliminated, and a slurry having a high concentration and which can be pumped is produced.
また、以上のように、粘度の観点からは微粒炭の添加
率が低いことが望ましいが、微粒炭の添加率が10重量％
を下廻ると、スラリ中の粗粒炭が沈降してスラリの安定
性を損うので、本発明（２）における微粒炭の重量％の
下限は10％とした。As described above, from the viewpoint of viscosity, it is desirable that the addition rate of the fine coal is low, but the addition rate of the fine coal is 10% by weight.
If it is less than, the coarse coal in the slurry sediments and impairs the stability of the slurry. Therefore, the lower limit of the weight% of the fine coal in the present invention (2) is set to 10%.
また更に、石炭・水スラリに含まれる石灰石は、石炭
の燃焼によって生ずる硫黄酸化物の除去に寄与する。Furthermore, the limestone contained in the coal / water slurry contributes to the removal of sulfur oxides generated by burning the coal.
本発明の第１の実施例を、第１図によって説明する。 A first embodiment of the present invention will be described with reference to FIG.
石炭として海外炭のＮ炭を用い、ハンマークラッシャ
ー18で粉砕して得た平均粒径2.2mmの粗粒炭19の85重量
％、平均粒径0.5mmの石灰石20の５重量％、及び第５図
に示す従来の脱じん装置15から排出された平均粒径27μ
の微粒灰17の10重量％に水21を加え、スラリ調整槽22で
撹拌器23により撹拌混合して石炭・水スラリを製造す
る。85% by weight of coarse coal 19 having an average particle diameter of 2.2 mm obtained by pulverizing with a hammer crusher 18 using N coal as an overseas coal, 5% by weight of limestone 20 having an average particle diameter of 0.5 mm, and No. 5 coal Average particle size 27μ discharged from the conventional dust removal device 15 shown in the figure
Water 21 is added to 10% by weight of the fine ash 17 of the above, and the mixture is stirred and mixed by a stirrer 23 in a slurry adjusting tank 22 to produce a coal / water slurry.
製造された石炭・水スラリは、例えば、ポンプ24によ
り第５図に示す石炭・石灰石供給管10を介して加圧流動
床燃焼炉11に供給される。The produced coal / water slurry is supplied to the pressurized fluidized bed combustion furnace 11 through a coal / limestone supply pipe 10 shown in FIG.
第２図は、本第１の実施例におけるような粒径をもつ
粗粒炭、石灰石及び微粒灰よりなる石炭・水スラリの石
炭濃度と粘度の関係を示す。FIG. 2 shows the relationship between the coal concentration and the viscosity of a coal / water slurry composed of coarse coal, limestone and fine ash having a particle size as in the first embodiment.
第２図から、粗粒炭：石灰石：微粒灰の混合比が85:
5:10と微粒灰の添加率が低い本第１の実施例の場合が、
同一粘度での石炭濃度が最も高いことが分る。従って、
本第１の実施例によって製造された石炭・水スラリは、
ポンプ輸送の点からも、燃焼効率の点からでも優れてい
ることを第２図が示している。From Fig. 2, the mixture ratio of coarse coal: limestone: fine ash is 85:
In the case of the first embodiment in which the addition ratio of fine ash is low at 5:10,
It can be seen that the coal concentration at the same viscosity is the highest. Therefore,
The coal / water slurry manufactured according to the first embodiment is:
FIG. 2 shows that it is excellent both in terms of pumping and combustion efficiency.
また、以上のように、微粒灰の添加率を低くすること
が石炭・水スラリのポンプ輸送及び燃焼効率上は望まし
いが、その添加率が10重量％を下廻ると、スラリ中の粗
粒炭が沈降するため、スラリの安定性上、微粒炭の添加
率の下限を10重量％とする必要がある。As described above, it is desirable to reduce the addition rate of fine ash in terms of pumping and combustion efficiency of coal and water slurry, but if the addition rate is less than 10% by weight, coarse coal in the slurry is Therefore, it is necessary to set the lower limit of the addition rate of the fine coal to 10% by weight from the viewpoint of the stability of the slurry.
本発明の第２の実施例を第３図によって説明する。 A second embodiment of the present invention will be described with reference to FIG.
石炭として海外炭のＮ炭31を用い、ハンマーフラッシ
ャー32で粉砕して得た平均粒径2.2mmの粗粒炭33の85重
量％、次に粗粒炭33を湿式チューブミル34でさらに粉砕
して製造した石炭濃度55％、200メッシュアンダー85％
の微粒炭35の10重量％、平均粒径0.3mmの石灰石36の５
重量％および水37を加え、スラリ調整槽38で撹拌機39に
より撹拌混合して石炭・水スラリを製造する。製造され
た石炭・水スラリは、例えば、ポンプ40によって第５図
に示す石炭供給管10を介して加圧流動床ボイラ燃焼炉11
に供給される。85% by weight of coarse coal 33 having an average particle size of 2.2 mm obtained by crushing with a hammer flasher 32 using N coal 31 of overseas coal as the coal, and then further crushing the coarse coal 33 with a wet tube mill 34 Manufactured coal concentration 55%, 200 mesh under 85%
10% by weight of fine-grained coal 35, limestone 36-5 with an average particle size of 0.3 mm
The weight% and water 37 are added, and the mixture is stirred and mixed by a stirrer 39 in a slurry adjusting tank 38 to produce a coal / water slurry. The produced coal / water slurry is, for example, pumped through a coal supply pipe 10 shown in FIG.
Supplied to
第４図は、本第２の実施例におけるような粒径をもつ
粗粒炭と微粒炭よりなる石炭・水スラリの石炭濃度と粘
度の関係を示す。FIG. 4 shows the relationship between the coal concentration and the viscosity of a coal / water slurry composed of coarse coal and fine coal having a particle size as in the second embodiment.
第４図から、粗粒炭の微粒炭に対する重量比が大きく
なる程、同一粘度での石炭濃度は高く、石炭・水スラリ
のポンプ輸送の点からも、燃焼効率の点からも、本第２
の実施例における粗粒炭：石灰石：微粒炭の混合率が8
5:5:10の場合が最も優れていることが分る。From FIG. 4, it can be seen that the larger the weight ratio of coarse coal to fine coal, the higher the coal concentration at the same viscosity, and the better the coal and water slurry pumping and combustion efficiency.
The mixture ratio of coarse coal: limestone: fine coal in the example of Example 8 is 8
It turns out that the case of 5: 5: 10 is the best.
また、以上のように、粗粒炭の添加率を低くする程石
炭・水スラリのポンプ輸送及び燃焼効率上は望ましい
が、その添加率が10重量％を下廻ると粗粒炭が沈降する
ため、スラリの安定性上、微粒炭の添加率の下限を10重
量％とする必要がある。As described above, the lower the addition rate of coarse coal, the better the pumping efficiency and combustion efficiency of coal / water slurry. However, if the addition rate is less than 10% by weight, coarse coal sediments. In view of the stability of the slurry, the lower limit of the fine coal content needs to be 10% by weight.
〔発明の効果〕 本発明に係る石炭・水スラリの製造方法は、特許請求
の範囲に記載された構成を具えることによって、簡単な
工程によって、粘度が低くて輸送が容易であり、かつ、
石炭濃度が高くて燃焼効率の高く、しかも安定性のある
石炭・水スラリを低コストで製造することができ、産業
上極めて有益な方法である。[Effect of the Invention] The method for producing a coal / water slurry according to the present invention, by including the configuration described in the claims, by a simple process, low viscosity, easy transport, and,
This is a very useful industrial method because it can produce low-cost coal and water slurry with high coal concentration, high combustion efficiency, and stability.
第１図は本発明の第１の実施例の系統図、第２図は同第
１の実施例等による石炭・水スラリの石炭濃度とスラリ
粘度の関係を示すグラフ、第３図は本発明の第２の実施
例の系統図、第４図は同第２の実施例等による石炭・水
スラリの石炭濃度とスラリ粘度の関係を示すグラフ、第
５図は従来の加圧流動床ボイラの石炭・石灰石供給装置
の側面図である。 17……微粒灰、18……ハンマークラッシャー、 19……粗粒炭、20……石灰石、 21……水、22……スラリ調整槽、 23……撹拌器、24……ポンプ、 31……石炭、32……ハンマークラッシャー、 33……粗粒炭、34……チューブミル、 35……微粒炭、36……石灰石、 37……水、38……スラリ調整槽、 39……撹拌機、40……ポンプ。FIG. 1 is a system diagram of a first embodiment of the present invention, FIG. 2 is a graph showing a relationship between a coal concentration and a slurry viscosity of a coal / water slurry according to the first embodiment and the like, and FIG. Fig. 4 is a system diagram of the second embodiment, Fig. 4 is a graph showing the relationship between the coal concentration and the slurry viscosity of the coal / water slurry according to the second embodiment, etc., and Fig. 5 is a conventional pressurized fluidized-bed boiler. It is a side view of a coal and limestone supply device. 17 fine ash, 18 hammer crusher, 19 coarse coal, 20 limestone, 21 water, 22 slurry control tank, 23 stirrer, 24 pump, 31 Coal, 32: hammer crusher, 33: coarse coal, 34: tube mill, 35: fine coal, 36: limestone, 37: water, 38: slurry adjusting tank, 39: stirrer, 40 ... Pump.
Claims (2)
〜90重量％と、加圧流動床ボイラ燃焼炉の脱じん装置か
ら排出される微粒灰20〜10重量％とを、水を添加して撹
拌混合することを特徴とする石炭・水スラリの製造方
法。A coarse coal 80 containing limestone and having an average particle size of 0.3 to 3 mm.
Coal / water slurry production characterized by adding water and stirring and mixing 90 to 90% by weight and 20 to 10% by weight of fine ash discharged from a dust removal device of a pressurized fluidized bed boiler combustion furnace. Method.
〜90重量％と、200メッシュアンダー80〜90％の微粒炭2
0〜10重量％とを、水を添加して撹拌混合することを特
徴とする石炭・水スラリの製造方法。2. Coarse-grained coal 80 containing limestone and having an average particle size of 0.3 to 3 mm.
~ 90% by weight and 200 mesh under 80 ~ 90% fine coal 2
A method for producing a coal / water slurry, wherein water is added to water and mixed with stirring by stirring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15401390A JP2622302B2 (en) | 1990-06-14 | 1990-06-14 | Coal / water slurry production method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15401390A JP2622302B2 (en) | 1990-06-14 | 1990-06-14 | Coal / water slurry production method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0446995A JPH0446995A (en) | 1992-02-17 |
| JP2622302B2 true JP2622302B2 (en) | 1997-06-18 |
Family
ID=15575002
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15401390A Expired - Fee Related JP2622302B2 (en) | 1990-06-14 | 1990-06-14 | Coal / water slurry production method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2622302B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2611921B2 (en) * | 1993-06-30 | 1997-05-21 | 川崎重工業株式会社 | Method and apparatus for producing high-concentration coal / water paste |
| CN104315506A (en) * | 2014-10-16 | 2015-01-28 | 张家港市大新热电有限公司 | Limestone conveying device of circulating fluidized bed boiler |
-
1990
- 1990-06-14 JP JP15401390A patent/JP2622302B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0446995A (en) | 1992-02-17 |
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