JPH06264075A - Stabilizer for highly concentrated coal/water slurry - Google Patents
Stabilizer for highly concentrated coal/water slurryInfo
- Publication number
- JPH06264075A JPH06264075A JP5224193A JP5224193A JPH06264075A JP H06264075 A JPH06264075 A JP H06264075A JP 5224193 A JP5224193 A JP 5224193A JP 5224193 A JP5224193 A JP 5224193A JP H06264075 A JPH06264075 A JP H06264075A
- Authority
- JP
- Japan
- Prior art keywords
- coal
- water slurry
- stabilizer
- viscosity
- salt
- 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
Links
- 239000003245 coal Substances 0.000 title claims abstract description 79
- 239000002002 slurry Substances 0.000 title claims abstract description 53
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 51
- 239000003381 stabilizer Substances 0.000 title claims abstract description 27
- 239000001768 carboxy methyl cellulose Substances 0.000 claims abstract description 13
- 229920002134 Carboxymethyl cellulose Polymers 0.000 claims abstract description 12
- 235000010948 carboxy methyl cellulose Nutrition 0.000 claims abstract description 12
- 239000008112 carboxymethyl-cellulose Substances 0.000 claims abstract description 12
- 150000003839 salts Chemical class 0.000 claims abstract description 12
- 239000007864 aqueous solution Substances 0.000 claims abstract description 6
- 239000002270 dispersing agent Substances 0.000 claims description 8
- 238000003860 storage Methods 0.000 abstract description 12
- 230000007774 longterm Effects 0.000 abstract description 2
- RPACBEVZENYWOL-XFULWGLBSA-M sodium;(2r)-2-[6-(4-chlorophenoxy)hexyl]oxirane-2-carboxylate Chemical compound [Na+].C=1C=C(Cl)C=CC=1OCCCCCC[C@]1(C(=O)[O-])CO1 RPACBEVZENYWOL-XFULWGLBSA-M 0.000 abstract 1
- 238000000034 method Methods 0.000 description 14
- 230000000052 comparative effect Effects 0.000 description 9
- 239000002245 particle Substances 0.000 description 7
- 238000004062 sedimentation Methods 0.000 description 6
- 238000013112 stability test Methods 0.000 description 5
- -1 alkali metal salt Chemical class 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 229920002125 Sokalan® Polymers 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 239000010419 fine particle Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000004584 polyacrylic acid Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000010298 pulverizing process Methods 0.000 description 2
- 239000004449 solid propellant Substances 0.000 description 2
- 239000004094 surface-active agent Substances 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 1
- 229920002845 Poly(methacrylic acid) Chemical class 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 1
- 150000001342 alkaline earth metals Chemical class 0.000 description 1
- 150000005215 alkyl ethers Chemical class 0.000 description 1
- 239000003945 anionic surfactant Substances 0.000 description 1
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 description 1
- 239000003830 anthracite Substances 0.000 description 1
- 239000002802 bituminous coal Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000006266 etherification reaction Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000003077 lignite Substances 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- PSZYNBSKGUBXEH-UHFFFAOYSA-N naphthalene-1-sulfonic acid Chemical class C1=CC=C2C(S(=O)(=O)O)=CC=CC2=C1 PSZYNBSKGUBXEH-UHFFFAOYSA-N 0.000 description 1
- 239000002736 nonionic surfactant Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920000570 polyether Polymers 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 description 1
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 description 1
- 159000000000 sodium salts Chemical class 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000003476 subbituminous coal Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229920003169 water-soluble polymer Polymers 0.000 description 1
Landscapes
- Liquid Carbonaceous Fuels (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、石炭・水スラリー用安
定剤に関する。更に詳しくは、微粉炭を水に分散させ高
濃度且つ低粘度であって、輸送、貯蔵、取扱いなどが容
易であり貯蔵中、輸送中に石炭粒子の沈降が非常に遅
く、圧密化することのない安定性に優れた石炭・水スラ
リーに関する。TECHNICAL FIELD The present invention relates to a stabilizer for coal / water slurry. More specifically, pulverized coal is dispersed in water and has a high concentration and low viscosity, which facilitates transportation, storage, handling, etc., and during storage, coal particles are very slowly sedimented during the transportation, and thus it is possible to consolidate the coal. It relates to a coal / water slurry with excellent stability.
【０００２】[0002]
【従来の技術及び発明が解決しようとする課題】近年、
石油資源の枯渇により石炭の利用が再確認されその利用
方法が種々検討されている。しかしながら、石炭は石油
と異なり固体であるためにポンプ輸送ができない等の理
由で、輸送や貯蔵を効率よく行うことができないという
欠点がある。2. Description of the Related Art In recent years,
Utilization of coal has been reconfirmed due to exhaustion of petroleum resources, and various utilization methods have been studied. However, unlike oil, coal is a solid and cannot be pumped, so that it cannot be efficiently transported or stored.
【０００３】これらの欠点を改善するために、石炭を粉
体化して水中に分散し、水スラリーにする方法が種々検
討されている。しかしながら、この方法は石炭濃度を上
げていくと著しく増粘し、流動性がなくなるためポンプ
輸送が困難になってくる。一方、石炭濃度を下げると、
輸送効率が低下し、更に燃焼前に脱水工程が必要となっ
てきて費用がかかるために実用的ではない。これらの問
題点を解決するために種々の添加剤の検討や石炭の粒度
分布の検討などが行われている。In order to improve these drawbacks, various methods of pulverizing coal and dispersing it in water to prepare an aqueous slurry have been studied. However, in this method, as the coal concentration is increased, the viscosity is remarkably increased and the fluidity is lost, which makes pumping difficult. On the other hand, if the coal concentration is lowered,
It is not practical because the transportation efficiency is lowered and a dehydration step is required before combustion, which is expensive. In order to solve these problems, various additives have been studied and the particle size distribution of coal has been studied.
【０００４】しかしながら、これらの方法により、高濃
度で石炭を含む石炭・水スラリーの粘度を低下させたと
しても、高濃度石炭・水スラリーは、輸送中のタンカー
やタンクローリー、貯蔵中のタンクの中で石炭の沈降が
起こり、圧密化された沈降層を形成する場合が多い。こ
の様な場合には、石炭・水スラリーの性状変化が生じる
と共に沈降層を再び分散させて使用することは極めて困
難であり、作業効率の大きな低下につながる。従って、
高濃度かつ低粘度の石炭・水スラリーの安定性を向上さ
せることは、石炭・水スラリーの実用上極めて重要であ
る。However, even if the viscosity of the coal / water slurry containing coal at a high concentration is reduced by these methods, the high-concentration coal / water slurry is still contained in a tanker during transportation, a tank truck, or a tank during storage. In many cases, coal sedimentation occurs and a consolidated sedimentation layer is formed. In such a case, the property of the coal / water slurry will change, and it will be extremely difficult to disperse and use the sedimentation layer again, leading to a large decrease in work efficiency. Therefore,
Improving the stability of high-concentration and low-viscosity coal / water slurry is extremely important for practical use of the coal / water slurry.
【０００５】従来においても石炭・水スラリーの安定剤
については、種々の検討がなされているが十分なもので
はない。例えば、特開昭63-165489 号には、石炭・水ス
ラリーに水溶性高分子と微粒子状無機物質とから成る安
定剤を添加することが記載されているが、無機物質を添
加することによりスラリー中の灰分を増大させることに
つながり適当ではない。また、カルボキシメチルセルロ
ースの記載もあるが、その物性値についての規定は全く
なされておらず、これらと安定性を関連づける記載も見
当たらない。Conventionally, various studies have been made on stabilizers for coal / water slurries, but they are not sufficient. For example, Japanese Patent Laid-Open No. 63-165489 describes adding a stabilizer composed of a water-soluble polymer and a particulate inorganic substance to a coal / water slurry. It is not suitable because it increases the ash content. In addition, although there is a description of carboxymethyl cellulose, no definition is given regarding the physical property values thereof, and no description relating these to stability is found.
【０００６】[0006]
【課題を解決するための手段】本発明者等は、微粒子石
炭を高濃度で含有しているにも関わらず低粘度であり、
しかも長期間の保存中石炭の沈降が極めて遅く、圧密化
された沈降層が形成されない安定性の極めて優れた石炭
・水スラリーを提供すべく、石炭・水スラリーに添加す
る安定剤とその安定性について種々検討していたとこ
ろ、１重量％水溶液の粘度が25℃において 2,000〜10,0
00センチポイズ(cp)のカルボキシメチルセルロースまた
はその塩を少量添加することにより、石炭・水スラリー
全体の粘度を極端に挙げることなく微粉石炭の沈降が極
めて抑制され安定な高濃度石炭・水スラリーを得られる
ことを見出し、本発明を完成するに至った。[Means for Solving the Problems] The inventors of the present invention have a low viscosity in spite of containing a high concentration of fine particle coal,
Moreover, in order to provide a coal / water slurry with extremely excellent stability in which coal does not settle down during storage for a long period of time and a compacted settling layer is not formed, a stabilizer added to the coal / water slurry and its stability As a result of various investigations regarding the viscosity of a 1 wt% aqueous solution at 25 ° C,
By adding a small amount of 00 centipoise (cp) carboxymethyl cellulose or its salt, sedimentation of pulverized coal is extremely suppressed and stable high concentration coal / water slurry can be obtained without extremely raising the viscosity of the entire coal / water slurry. This has led to the completion of the present invention.
【０００７】即ち本発明は、１重量％水溶液の粘度が25
℃において 2,000〜10,000センチポイズ(cp)であるカル
ボキシメチルセルロースまたはその塩を必須成分として
なることを特徴とする高濃度石炭・水スラリー用安定剤
に関する。That is, according to the present invention, the viscosity of a 1% by weight aqueous solution is 25
The present invention relates to a stabilizer for high-concentration coal / water slurry, which comprises carboxymethylcellulose or its salt that is 2,000 to 10,000 centipoise (cp) at ° C as an essential component.
【０００８】本発明における石炭・水スラリー中の固体
燃料は石炭であり、その石炭は特に限定されず通常の燃
料として一般に使用されている無煙炭、れき青炭、亜れ
き青炭、褐炭、またはそれらをクリーン化したものを使
用することができる。また、石炭・水スラリー中の石炭
粒子の粒度も粉末であればどのような粒度であってもよ
いが、最大粒径が 500μm 以下が望ましい。しかし、本
発明の安定剤はどの様な粒径の石炭粉末に対しても優れ
た効果を発揮する。更に本発明の石炭・水スラリー中の
石炭の含有量は60〜80重量％であり、望ましくは65〜75
重量％である。本発明にて用いる安定剤は、１重量％水
溶液における粘度が25℃において 2,000〜10,000センチ
ポイズ(cp)であるカルボキシメチルセルロースまたはそ
の塩を必須成分として含有するものである。The solid fuel in the coal / water slurry in the present invention is coal, and the coal is not particularly limited, and anthracite, bituminous coal, subbituminous coal, brown coal, or those commonly used as ordinary fuels are used. It is possible to use the cleaned one. The particle size of the coal particles in the coal / water slurry may be any particle size as long as it is a powder, but the maximum particle size is preferably 500 μm or less. However, the stabilizer of the present invention exerts an excellent effect on coal powder of any particle size. Further, the content of coal in the coal-water slurry of the present invention is 60 to 80 wt%, preferably 65 to 75
% By weight. The stabilizer used in the present invention contains, as an essential component, carboxymethyl cellulose or a salt thereof having a viscosity of 2,000 to 10,000 centipoise (cp) at 25 ° C. in a 1% by weight aqueous solution.
【０００９】本発明に用いるカルボキシメチルセルロー
スまたはその塩のエーテル化度は、0.3〜2.7 の範囲で
水溶性であればよい。塩としては、ナトリウム、カリウ
ム、リチウムなどのアルカリ金属塩、アミン塩、及びこ
れらの塩の一部がカルシウムなどのアルカリ土類金属で
置換されたものなどが使用できる。The degree of etherification of carboxymethyl cellulose or a salt thereof used in the present invention may be within the range of 0.3 to 2.7 as long as it is water-soluble. As the salt, an alkali metal salt such as sodium, potassium and lithium, an amine salt, and a salt in which a part of these salts is replaced with an alkaline earth metal such as calcium can be used.
【００１０】上記安定剤の添加量は、石炭・水スラリー
100重量部に対して 0.001〜0.5 重量部、好ましくは、
0.005〜0.05重量部の範囲内の量である。安定剤の量が
上記範囲よりも少ないと石炭・水スラリーの安定化が不
十分であり、上記範囲よりも多いと石炭・水スラリーの
粘度が高くなり、スラリーの流動性が低下するため石炭
の濃度を低減する必要が生じ好ましくない。The amount of the above-mentioned stabilizer added is the amount of coal / water slurry.
0.001-0.5 parts by weight per 100 parts by weight, preferably,
The amount is in the range of 0.005 to 0.05 parts by weight. When the amount of the stabilizer is less than the above range, the stabilization of the coal / water slurry is insufficient, and when it is more than the above range, the viscosity of the coal / water slurry becomes high and the fluidity of the slurry decreases, so It is not preferable because it is necessary to reduce the concentration.
【００１１】本発明の石炭・水スラリーにおいては、高
濃度化にともなう粘度上昇を抑制するために、適当な分
散剤を含有させることが望ましい。分散剤としては、そ
れ自体公知のノニオン性あるいはアニオン性界面活性剤
を使用することができ、例えばポリアクリル酸塩、ポリ
メタクリル酸塩、ナフタレンスルホン酸塩、ポリエーテ
ル類、ポリオキシエチレンアルキルエーテル硫酸エステ
ル塩等が挙げられる。In the coal / water slurry of the present invention, it is desirable to contain an appropriate dispersant in order to suppress an increase in viscosity with increasing concentration. As the dispersant, known nonionic or anionic surfactants can be used, and examples thereof include polyacrylic acid salts, polymethacrylic acid salts, naphthalenesulfonic acid salts, polyethers, polyoxyethylene alkyl ether sulfuric acid. Examples thereof include ester salts.
【００１２】本発明の石炭・水スラリーを製造する方法
としては、石炭を予め乾式で粉砕した後、分散剤、安定
剤の混合溶液中に微粉石炭を混合する方法や、適当な分
散剤を用いて石炭・水スラリーを調製した後、安定剤を
添加する方法や、ミル中へ石炭、水、分散剤、安定剤を
加え、石炭を粉砕しながら混合する方法などがある。As a method for producing the coal / water slurry of the present invention, a method of pulverizing coal in advance by a dry method and then mixing pulverized coal in a mixed solution of a dispersant and a stabilizer, or a suitable dispersant is used. There is a method of adding a stabilizer after preparing a coal / water slurry by using the method, a method of adding coal, water, a dispersant, and a stabilizer into a mill and mixing while crushing the coal.
【００１３】本発明の安定剤は、それ自身の水溶液の粘
度は、１重量％の水溶液で25℃において 2,000〜10,000
センチポイズ(cp)と非常に高いものであるが、石炭・水
スラリーに添加した場合、系全体の粘度は、低粘度のカ
ルボキシメチルセルロースを添加した場合とほとんど変
わらない。それにもかかわらず、降伏値が大きくなり微
粉石炭の沈降は極めて抑制される。The stabilizer of the present invention has a viscosity of 2,000 to 10,000 at 25 ° C. in a 1% by weight aqueous solution.
Although it is very high as centipoise (cp), when it is added to a coal / water slurry, the viscosity of the entire system is almost the same as when low-viscosity carboxymethyl cellulose is added. Nevertheless, the yield value increases and the sedimentation of pulverized coal is extremely suppressed.
【００１４】[0014]
【発明の効果】本発明の石炭・水スラリーは、固体燃料
である石炭を高濃度で含有しているにも関わらず、その
粘度は低くポンプによる圧送が可能であり、しかも安定
性に優れているので、長期の保存、長距離の輸送が可能
である。INDUSTRIAL APPLICABILITY The coal-water slurry of the present invention has a low viscosity, can be pumped by a pump, and is excellent in stability, even though it contains a high concentration of coal which is a solid fuel. Therefore, long-term storage and long-distance transportation are possible.
【００１５】[0015]
【実施例】以下に本発明の実施例及び比較例を示すが、
本発明はこれらの実施例によって限定されるものではな
い。EXAMPLES Examples and comparative examples of the present invention will be shown below.
The invention is not limited by these examples.
【００１６】(石炭微粒子の調製)ボールミル中で乾燥さ
せた石炭を乾式で粉砕を行い幾何平均径約 100μm に粉
砕した微粒子状石炭と、同微粒子状石炭を更にボールミ
ルで幾何平均径約10μmに乾式粉砕した超微粒子状石炭
とそれぞれ絶乾状態で60対40の重量割合で配合した。(Preparation of Coal Fine Particles) Coal dried in a ball mill is pulverized by a dry method and pulverized to a geometric mean diameter of about 100 μm, and fine coal is further pulverized to a geometric mean diameter of about 10 μm by a ball mill. It was blended with crushed ultrafine particulate coal in a dry ratio of 60:40.
【００１７】(石炭・水スラリーの調製)石炭・水スラリ
ーの調製は、水の中に予め分散剤である一般に知られて
いる界面活性剤と安定剤であるカルボキシメチルセルロ
ースを溶解させておき、モーターによって攪拌しながら
所定量の微粉砕石炭を投入した。投入後 3000rpmで15分
間攪拌を行った。実施例及び比較例における石炭・水ス
ラリーの性状、石炭・水スラリーの粘度測定方法、貯蔵
安定性試験法を次に示す。(Preparation of Coal / Water Slurry) Coal / water slurry is prepared by dissolving a generally known surfactant, which is a dispersant, and carboxymethylcellulose, which is a stabilizer, in water, and a motor is used. While stirring, a predetermined amount of finely pulverized coal was charged. After the addition, the mixture was stirred at 3000 rpm for 15 minutes. The properties of the coal / water slurry, the viscosity measuring method of the coal / water slurry, and the storage stability test method in Examples and Comparative Examples are shown below.
【００１８】(石炭・水スラリーの性状)実施例及び比較
例における石炭・水スラリーの構成成分、石炭濃度、粘
度を表１に示した。(Properties of Coal / Water Slurry) Table 1 shows the constituent components, coal concentration and viscosity of the coal / water slurry in Examples and Comparative Examples.
【００１９】(粘度測定方法)石炭・水スラリーの粘度測
定は、二重円筒型粘度計 (ハーケ社製、RV-2型) で25℃
において行った。剪断速度を図１のように時間に対して
変化させ、剪断速度が 100 1/sの時の粘度を見かけ粘度
とした。(Viscosity measuring method) The viscosity of the coal / water slurry is measured at 25 ° C. with a double cylinder type viscometer (RV-2 type manufactured by Haake).
I went to. The shear rate was changed with time as shown in FIG. 1, and the viscosity when the shear rate was 100 1 / s was taken as the apparent viscosity.
【００２０】(石炭・水スラリーの貯蔵安定性試験方法)
石炭・水スラリーを調製した後それをいくつかの容積 3
00mlの容器に 200mlずつ分割しそれらを一定期間静置後
上部60mlの粘度を測定することにより石炭・水スラリー
の貯蔵安定性を評価した。スラリーの安定性が悪いとそ
の上部の粘度は、経時的に大きく変化し、安定性が優れ
ているとその粘度変化は少ない。図２には実施例及び比
較例のそれぞれの場合においてある一定期間静置したと
きの石炭・水スラリーの上部の粘度をそれぞれの製造時
の粘度で規格化した値を縦軸に、また経過日数を横軸に
とったものを示した。(Coal / water slurry storage stability test method)
After preparing the coal-water slurry, put it into several volumes 3
The storage stability of the coal / water slurry was evaluated by dividing each 200 ml into a 00 ml container, allowing them to stand for a certain period of time, and measuring the viscosity of the upper 60 ml. If the stability of the slurry is poor, the viscosity of the upper portion of the slurry changes significantly with time, and if the stability is excellent, the viscosity changes little. In FIG. 2, the vertical axis indicates the value obtained by normalizing the viscosity of the upper portion of the coal / water slurry when left standing for a certain period of time in each of the Examples and Comparative Examples, and the number of days elapsed. Is shown on the horizontal axis.
【００２１】実施例１、２ 上記の石炭を使用し、分散剤としてポリアクリル酸ナト
リウム塩をスラリー全体に対して約 0.5重量％、また表
１に示した本発明の安定剤を表１に示した量を使用し石
炭濃度を表１に示した濃度に調製した。その貯蔵安定性
試験の結果を図２に示した。また表２には、20日後の石
炭・水スラリーの上部の粘度を初日の粘度で規格化した
値を示した。Examples 1 and 2 Using the above coals, polyacrylic acid sodium salt as a dispersant was used in an amount of about 0.5% by weight based on the whole slurry, and the stabilizer of the present invention shown in Table 1 is shown in Table 1. The amount of coal used was adjusted to the concentration shown in Table 1. The result of the storage stability test is shown in FIG. Table 2 shows the viscosity of the upper part of the coal / water slurry after 20 days, normalized by the viscosity of the first day.
【００２２】実施例３、４ 実施例１で用いた安定剤を使用し、表１に示した量を添
加することにより石炭・水スラリーを表１に示したよう
な構成成分で調製した。その貯蔵安定性試験の結果を実
施例１、２と同様に表２に示した。Examples 3 and 4 Coal / water slurries were prepared with the components shown in Table 1 by using the stabilizers used in Example 1 and adding the amounts shown in Table 1. The results of the storage stability test are shown in Table 2 as in Examples 1 and 2.
【００２３】比較例１〜３ 安定剤として表１に示す本発明の範囲外のものを用いる
か (比較例１、２) 、あるいは安定剤を用いない (比較
例３) 石炭・水スラリーを実施例と同様に表１に示した
ような構成成分で調製した。その貯蔵安定性試験の結果
を図２に示した。Comparative Examples 1 to 3 Either a stabilizer outside the scope of the present invention shown in Table 1 is used as a stabilizer (Comparative Examples 1 and 2) or no stabilizer is used (Comparative Example 3). Coal / water slurry is carried out. Prepared with the components as shown in Table 1 as in the examples. The result of the storage stability test is shown in FIG.
【００２４】[0024]
【表１】 [Table 1]
【００２５】[0025]
【表２】 [Table 2]
【００２６】(評価結果)表１に示したようにそれ自体高
粘度のカルボキシメチルセルロースを添加した場合にお
いても、それ自体低粘度のカルボキシメチルセルロース
を添加した場合に比べて極端に粘度の上昇は起こらない
ことがわかる。また、図２に示したように本発明の安定
剤を用いることにより、一般の界面活性剤だけを添加し
た場合、あるいは本発明の安定剤よりも低粘度のカルボ
キシメチルセルロースナトリウムを添加した場合に比べ
て、微粉石炭の沈降による上部粘度低下は極端に少なく
なりスラリーの安定性が飛躍的に向上していることがわ
かる。(Evaluation Results) As shown in Table 1, even when carboxymethyl cellulose having a high viscosity is added, the viscosity does not extremely increase as compared with the case where carboxymethyl cellulose having a low viscosity is added. I understand. Further, as shown in FIG. 2, by using the stabilizer of the present invention, compared to the case of adding only a general surfactant, or the case of adding sodium carboxymethylcellulose having a lower viscosity than the stabilizer of the present invention. It can be seen that the decrease in the upper viscosity due to the sedimentation of the pulverized coal is extremely small, and the stability of the slurry is dramatically improved.
【図１】実施例及び比較例における石炭・水スラリーの
粘度測定時の時間と剪断速度の関係を表すグラフであ
る。FIG. 1 is a graph showing the relationship between shear rate and time when measuring the viscosity of coal / water slurries in Examples and Comparative Examples.
【図２】実施例及び比較例における粘度の経時的変化を
規格化した値で示したグラフである。FIG. 2 is a graph showing normalized changes in viscosity over time in Examples and Comparative Examples.
Claims (3)
2,000〜10,000センチポイズ(cp)であるカルボキシメチ
ルセルロースまたはその塩を必須成分としてなることを
特徴とする高濃度石炭・水スラリー用安定剤。1. The viscosity of a 1% by weight aqueous solution at 25 ° C.
A stabilizer for high-concentration coal / water slurries, which comprises 2,000-10,000 centipoise (cp) carboxymethyl cellulose or a salt thereof as an essential component.
量％である請求項１記載の高濃度石炭・水スラリー用安
定剤。2. The stabilizer for highly concentrated coal / water slurry according to claim 1, wherein the coal concentration of the coal / water slurry is 60 to 80% by weight.
散剤を添加することを特徴とする高濃度石炭・水スラリ
ー。3. A high-concentration coal / water slurry containing the stabilizer and the dispersant according to claim 1 or 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5224193A JP3577326B2 (en) | 1993-03-12 | 1993-03-12 | Stabilizer for high concentration coal / water slurry |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5224193A JP3577326B2 (en) | 1993-03-12 | 1993-03-12 | Stabilizer for high concentration coal / water slurry |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06264075A true JPH06264075A (en) | 1994-09-20 |
| JP3577326B2 JP3577326B2 (en) | 2004-10-13 |
Family
ID=12909231
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5224193A Expired - Fee Related JP3577326B2 (en) | 1993-03-12 | 1993-03-12 | Stabilizer for high concentration coal / water slurry |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3577326B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1997009399A1 (en) * | 1995-09-08 | 1997-03-13 | Central Research Institute Of Electric Power Industry | High-concentration coal/water mixture fuel and process for production thereof |
-
1993
- 1993-03-12 JP JP5224193A patent/JP3577326B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1997009399A1 (en) * | 1995-09-08 | 1997-03-13 | Central Research Institute Of Electric Power Industry | High-concentration coal/water mixture fuel and process for production thereof |
| AU713626B2 (en) * | 1995-09-08 | 1999-12-09 | Central Research Institute Of Electric Power Industry | High-density coal-water mixed fuel and producing method thereof |
| US6083286A (en) * | 1995-09-08 | 2000-07-04 | Central Research Institute Of Electric Power Industry | High-concentration coal/water mixture fuel and process for production thereof |
| CN1087769C (en) * | 1995-09-08 | 2002-07-17 | 财团法人电力中央研究所 | High-concentration coal/water mixture fuel and process for production thereof |
| US6488722B1 (en) * | 1995-09-08 | 2002-12-03 | Central Research Institute Of Electric Power Industry | Method and apparatus for spheroidizing particles |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3577326B2 (en) | 2004-10-13 |
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