JPH01192774A - Coating material for preventing adhesion of calcination raw material and use thereof - Google Patents
Coating material for preventing adhesion of calcination raw material and use thereofInfo
- Publication number
- JPH01192774A JPH01192774A JP63015872A JP1587288A JPH01192774A JP H01192774 A JPH01192774 A JP H01192774A JP 63015872 A JP63015872 A JP 63015872A JP 1587288 A JP1587288 A JP 1587288A JP H01192774 A JPH01192774 A JP H01192774A
- Authority
- JP
- Japan
- Prior art keywords
- adhesion
- raw materials
- coating
- coating material
- preventing
- 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
- 239000011248 coating agent Substances 0.000 title claims abstract description 75
- 238000000576 coating method Methods 0.000 title claims abstract description 75
- 239000002994 raw material Substances 0.000 title claims abstract description 63
- 239000000463 material Substances 0.000 title claims abstract description 44
- 238000001354 calcination Methods 0.000 title abstract description 6
- 239000011230 binding agent Substances 0.000 claims abstract description 28
- 239000004568 cement Substances 0.000 claims abstract description 24
- 239000003513 alkali Substances 0.000 claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000010410 layer Substances 0.000 claims abstract description 11
- 239000000843 powder Substances 0.000 claims abstract description 10
- 239000011819 refractory material Substances 0.000 claims abstract description 10
- 229920002472 Starch Polymers 0.000 claims abstract description 9
- 235000019698 starch Nutrition 0.000 claims abstract description 9
- 239000008107 starch Substances 0.000 claims abstract description 9
- 239000002612 dispersion medium Substances 0.000 claims abstract description 7
- 239000003921 oil Substances 0.000 claims abstract description 4
- 239000002480 mineral oil Substances 0.000 claims abstract description 3
- 235000010446 mineral oil Nutrition 0.000 claims abstract description 3
- 238000010304 firing Methods 0.000 claims description 45
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 24
- 239000002245 particle Substances 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 11
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 8
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 6
- 239000002345 surface coating layer Substances 0.000 claims description 6
- 239000002585 base Substances 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 239000000377 silicon dioxide Substances 0.000 claims description 4
- 239000004115 Sodium Silicate Substances 0.000 claims description 2
- YKTSYUJCYHOUJP-UHFFFAOYSA-N [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] Chemical compound [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] YKTSYUJCYHOUJP-UHFFFAOYSA-N 0.000 claims description 2
- 239000002270 dispersing agent Substances 0.000 claims description 2
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 2
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 2
- 238000010030 laminating Methods 0.000 claims 1
- 239000011247 coating layer Substances 0.000 abstract description 17
- 238000006243 chemical reaction Methods 0.000 abstract description 12
- 239000000126 substance Substances 0.000 abstract description 2
- 239000000853 adhesive Substances 0.000 abstract 1
- 230000001070 adhesive effect Effects 0.000 abstract 1
- 235000011837 pasties Nutrition 0.000 abstract 1
- 239000011449 brick Substances 0.000 description 10
- 229910010271 silicon carbide Inorganic materials 0.000 description 9
- 238000007689 inspection Methods 0.000 description 8
- 230000002265 prevention Effects 0.000 description 7
- 239000000725 suspension Substances 0.000 description 7
- 239000007789 gas Substances 0.000 description 5
- 230000007423 decrease Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000007921 spray Substances 0.000 description 4
- 235000019738 Limestone Nutrition 0.000 description 3
- 239000006028 limestone Substances 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000012790 confirmation Methods 0.000 description 2
- 230000009970 fire resistant effect Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000012768 molten material Substances 0.000 description 2
- JTJMJGYZQZDUJJ-UHFFFAOYSA-N phencyclidine Chemical class C1CCCCN1C1(C=2C=CC=CC=2)CCCCC1 JTJMJGYZQZDUJJ-UHFFFAOYSA-N 0.000 description 2
- -1 DNC Ion Chemical class 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 239000008280 blood Substances 0.000 description 1
- 210000004369 blood Anatomy 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Landscapes
- Ceramic Products (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Paints Or Removers (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分針〕
この発明は・セメントや耐火材料などのクリンカー焼成
設備における耐火材壁面への焼成原料付着防止用塗材お
よびそれを用いた焼成原料付着防止方法に関するもので
ある。[Detailed Description of the Invention] [Industrial Application Minute Hand] This invention provides a coating material for preventing the adhesion of firing raw materials to the wall surface of refractory materials in clinker firing equipment such as cement and refractory materials, and a method for preventing the adhesion of firing raw materials using the same. It is related to.
セメントや耐火材料などのクリンカーの焼成は、複数の
サイクロン型熱交換器をダクトで縦に連結したサスペン
ションブレヒーター付きのロータリーキルン（ＳＰキル
ン）を用いて行われることが多い。例えばセメントクリ
ンカーの焼成では、石灰石（Ｃ，ＣＯ，）、粘土（Ｓｉ
Ｏ，、ＡＩ、Ｏ，、Ｆｅ、０．）などを混合してなるセ
メン１−Ｊｊｌ［をサスベンジジンプレヒーターの上方
から複数段のサイクロンに順次導いて降下させつつ、下
方からキルン排熱を導入してサイクロン内の気流中で高
効率で予熱し、原料中の石灰石を実質的に部分焼成した
後、ロータリーキルン内に導いている。Clinker, such as cement or refractory materials, is often fired using a rotary kiln (SP kiln) equipped with a suspension brake heater, in which multiple cyclone heat exchangers are connected vertically through ducts. For example, in the firing of cement clinker, limestone (C, CO,), clay (Si
O,,AI,O,,Fe,0. ), etc., is sequentially guided from above the suspension gin preheater to multiple stages of cyclones and lowered, while kiln waste heat is introduced from below to achieve high efficiency in the airflow inside the cyclone. After preheating and substantially partially calcining the limestone in the raw material, it is introduced into a rotary kiln.
この場合、プレヒーターの上方サイクロンに投入された
セメント原料粉は、複数段のサイクロンを通過中に加熱
されて下方にくるに従い高温となり、およそ１１００〜
１２００℃に達すると原料中の石灰石の成分Ｃ，ＣＯ，
がＣ，０とＣＯ，とに分離し、脱酸される。その後、Ｃ
１０と他の原料成分はロータリーキルン内に入って更に
加熱され、約１８００℃で溶融する。この溶融物はクー
ラーに送られ、冷却により固体反応を起こしてセメント
クリンカ−となる。In this case, the cement raw material powder fed into the upper cyclone of the preheater is heated while passing through multiple stages of cyclones, and becomes hotter as it goes lower, approximately 1100~
When the temperature reaches 1200℃, the components of limestone in the raw material C, CO,
is separated into C,0 and CO, and deoxidized. After that, C
10 and other raw material components enter a rotary kiln where they are further heated and melted at about 1800°C. This molten material is sent to a cooler, where cooling causes a solid reaction to become cement clinker.
ところで・セメント原料はできるだけアルカリ分の少な
い原料を用いるのが良いとされてはいるものの、実際の
セメント原料中には前記成分以外にに、０．Ｈａ、０な
どのアルカリ分が含まれており、通常用いられているも
のでもアルカリ分は０．５ｘ以下で含有され、なかには
それよりも多量にアルカリ分を含むものもある。またキ
ルンの燃料が石油から石炭に再転換されるに伴って、燃
焼排ガス中のアルカリ分の濃度も上昇している状況にあ
る。By the way, although it is said that it is best to use raw materials for cement that have as little alkali content as possible, in actual cement raw materials, in addition to the above-mentioned components, 0. It contains alkaline content such as Ha, 0, etc., and even those commonly used contain an alkali content of 0.5x or less, and some contain a larger amount of alkali content than that. Additionally, as the fuel for kilns is being reconverted from oil to coal, the concentration of alkaline content in combustion exhaust gas is also increasing.
このように現実には原料および燃焼排ガス中おけるアル
カリ分の存在は不可避であり、原料中のアルカリ分は前
述のように約１８００℃で原料が溶融化する際に気化し
て、キルン内から排ガスと共にキルン原料投入口を介し
てプレヒーター内に還流して（る。In this way, in reality, the presence of alkaline content in the raw materials and combustion exhaust gas is unavoidable, and as mentioned above, the alkaline content in the raw materials vaporizes when the raw materials are melted at approximately 1800°C, and is released from the exhaust gas from inside the kiln. At the same time, it is refluxed into the preheater through the kiln raw material inlet.
この還流ガス中のアルカリ分は、プレヒーター内を上方
へと還流するにつれて温度低下と共に凝結して固体化し
、上方からのセメント原料粉と一緒になって再びキルン
内へと運ばれる。このようにしてアルカリ分の循環が起
こり、これが繰り返されて行くうちにプレヒーター内の
セメント原料中のアルカリ濃度が次第に濃くなってくる
。このアルカリ濃度が３〜５％程度になると・セメント
原料の溶融化温度が低下し、１１００−１２００℃程度
で早くも七メント原料の溶融が始まるようになり、アル
カリ濃度の上昇と共にこの溶融化域が原料流れの上流側
へと移動してくるようになる。この溶融物は粘着性のも
のであり、キルン原料投入口隔壁などの耐火レンガ表面
に付着してレンガとアルカリ反応を起こし、レンガ表面
を浸食してレンガと一体化した固いコーティング層にな
ってしまうのが避けられない。この焼成原料のコーティ
ング層は繰り返しの堆積で次第に成長し、その結果、当
該部分での流路断面積が狭くなり、原料および排ガスの
通過が阻害され、プレヒーター内の各セクションでの内
圧や温度コントロールにも異常が生じるようになる。As the alkali content in this refluxed gas flows upward through the preheater, it condenses and solidifies as the temperature decreases, and is transported back into the kiln together with the cement raw material powder from above. In this way, circulation of alkaline content occurs, and as this cycle is repeated, the alkali concentration in the cement raw material in the preheater gradually increases. When this alkali concentration becomes about 3 to 5%, the melting temperature of the cement raw material decreases, and the melting of the cement raw material begins as early as about 1100 to 1200 °C, and as the alkali concentration increases, the melting temperature of the cement raw material decreases. begins to move upstream in the raw material flow. This molten material is sticky and adheres to the surface of the refractory bricks such as the bulkheads of the kiln raw material inlet and causes an alkaline reaction with the bricks, eroding the brick surface and forming a hard coating layer that is integrated with the bricks. is unavoidable. This coating layer of firing raw materials gradually grows through repeated deposition, and as a result, the cross-sectional area of the flow path at the relevant portion becomes narrower, impeding the passage of raw materials and exhaust gas, and increasing the internal pressure and temperature of each section within the preheater. Abnormalities also occur in the control.
通常、アルカリ分が多くなって原料溶融が始まる温度範
囲は１０５０−１２００℃であり、従ってこの温度範囲
の部分が、前述コーティング層の生じる危険性のある箇
所とされている。一般にはこのような温度範囲の部分は
ロータリーキルン内の原料投入口付近にあるが、前述の
流路断面積の減少などで温度コントロールがうまく行か
なくなると、この温度範囲の部分が動き、ときにはプレ
ヒーター内に移動する。その結果、プレヒーター内での
反応が起きてプレヒーターでの前述コーティング層が生
じることになる。Normally, the temperature range where the alkali content increases and the raw material starts to melt is 1050-1200°C, and therefore, this temperature range is considered to be the area where the above-mentioned coating layer is likely to form. Generally, the area within this temperature range is located near the raw material inlet in the rotary kiln, but if temperature control fails due to a decrease in the cross-sectional area of the flow path, etc., the area within this temperature range moves, and sometimes the preheater move inside. As a result, a reaction occurs within the preheater resulting in the aforementioned coating layer on the preheater.
従来、このプレヒーター内でアルカリ反応による焼成原
料コーティング層が生じると、高圧水の噴射などにより
コーティング層を切断または削り飛ばす作業を行ってお
り、この作業は毎日のように頻繁に行われていた。Conventionally, when a coating layer of firing raw materials was formed due to an alkaline reaction in this preheater, the coating layer was cut or scraped off using high-pressure water jets, etc., and this work was performed frequently on a daily basis. .
セメントや耐火材料などのクリンカー焼成設備における
耐火材壁面への焼成原料コーティング層の付着は不可避
的な現象であり、従来は成長し過ぎないうちにコーティ
ング層を人手で頻繁に剥離していた。この剥離作業は多
いときには１日に数回行っており、その都度キルンを止
めるわけにはいかないので、サスペンションプレヒータ
ーの必要箇所に設けられた作業窓から高圧水を噴射し、
加水反応で膨張したコーティング層を水圧で吹飛ばして
除去していた。これには１日当たり約１トン以上の水を
使い、またこの水分はプレヒーター内部で蒸発するので
莫大な熱量の浪費となり、作業中のプレヒーターの加熱
効率が大幅に低下するため・セメントクリンカ−の焼き
出し量も通常時の一１ＩＭ程度を覚悟しなければならず
、更にはプレヒーター内の水蒸気の大量発生によって原
料粉の凝集付着などの思わぬトラブルが発生することさ
えあった。In clinker firing equipment for cement and refractory materials, the adhesion of the firing raw material coating layer to the refractory wall surface is an inevitable phenomenon, and in the past, the coating layer was frequently peeled off manually before it grew too much. This stripping work is often done several times a day, and since it is not possible to stop the kiln each time, high-pressure water is injected through work windows installed at the necessary points on the suspension preheater.
The coating layer that expanded due to the hydration reaction was removed by blowing it away using water pressure. This uses approximately 1 ton or more of water per day, and as this water evaporates inside the preheater, a huge amount of heat is wasted, which greatly reduces the heating efficiency of the preheater during work.・Cement clinker One had to be prepared for the amount of baked-out to be about 11 IM compared to normal times, and furthermore, unexpected troubles such as agglomeration and adhesion of raw material powder could occur due to the generation of a large amount of water vapor in the preheater.
この発明は・セメントや耐火材料などのクリンカー焼成
設備における耐火材壁面への焼成原料ツーティ５ング層
の付着を阻害して、コーティング層が大きく成長するま
えに自分で落下してしまうような付着防止用塗材を提供
することを目的とするものであり、更にはその塗材を用
いた付着防止方法を提供することを目的とするものであ
る。This invention prevents the coating layer from falling by itself by inhibiting the adhesion of the firing raw material coating layer to the wall surface of the refractory material in clinker firing equipment such as cement and refractory materials. The object of the present invention is to provide a coating material for use in coating materials, and further to provide a method for preventing adhesion using the coating material.
前述の目的を達成するために、この発明の焼成原料付着
防止用塗材では、主成分としての高純度炭化珪素粉末を
、少皿の非アルカリ反応性バインダーと共に水または鉱
物油もしくは合成油のうちから選ばれた分散媒に均一に
分散させて糊状を呈するようにしてなるものである。In order to achieve the above-mentioned object, the coating material for preventing adhesion of fired raw materials of the present invention uses high-purity silicon carbide powder as the main component, along with a small plate of a non-alkali reactive binder, in water or mineral oil or synthetic oil. It is made by uniformly dispersing it in a dispersion medium selected from the following to form a paste-like appearance.
この発明の焼成原料付着防止用塗材では、好ましいひと
つの組成として、高純度炭化珪素粉末を２０〜７０重量
％と、非アルカリ反応性バインダーを３〜２０重量％と
、残部分散媒とからなる組成を有している。この場合、
炭化珪素粉末は２０重量％未満ではアルカリ反応防止効
果が不十分となり、７０重量％を超えると塗装作業性が
悪くなる。また前記バインダーは３重量％未満では糊状
を呈するに不足であり、２０重量％を超えると糊の流動
性が不足となって塗装性に欠けるようになる。この非ア
ルカリ反応性バインダーとしては澱粉を用いることがで
き、この場合、分散媒とじては水を用いると好適である
。A preferable composition of the coating material for preventing adhesion of fired raw materials of the present invention includes 20 to 70% by weight of high-purity silicon carbide powder, 3 to 20% by weight of a non-alkali reactive binder, and the remainder a dispersant. It has a composition. in this case,
If the silicon carbide powder is less than 20% by weight, the alkaline reaction prevention effect will be insufficient, and if it exceeds 70% by weight, the coating workability will be poor. Further, if the binder is less than 3% by weight, it is insufficient to form a paste-like appearance, and if it exceeds 20% by weight, the fluidity of the paste becomes insufficient, resulting in a lack of paintability. Starch can be used as the non-alkali reactive binder, and in this case, it is preferable to use water as the dispersion medium.
この発明の焼成原料付着防止用塗材の特に好ましい態様
では、主成分の高純度炭化珪素粉末を２０〜４０重量％
、バインダーとして澱粉を５〜１０重量％含み、これら
を水に均一に分散させて糊状にして塗材としてなるもの
である。In a particularly preferred embodiment of the coating material for preventing adhesion of fired raw materials of the present invention, the main component, high purity silicon carbide powder, is 20 to 40% by weight.
It contains 5 to 10% by weight of starch as a binder, and is made into a paste by uniformly dispersing it in water to form a coating material.
また、この発明に用いる高純度炭化珪素粉末としては、
純度９０％以上のものを用いるのが望ましい。さらにこ
の高純度炭化珪素粉末の粒径は５〜３００μｍの範囲内
とするのがよく、好ましくは平均粒径が４０μｍで、し
かもこの平均粒径以上のものが３５％、平均粒径未満の
ものが６５％の粒度分布をもつものとする。In addition, the high purity silicon carbide powder used in this invention includes:
It is desirable to use one with a purity of 90% or more. Furthermore, the particle size of this high-purity silicon carbide powder is preferably within the range of 5 to 300 μm, preferably the average particle size is 40 μm, and 35% of the particles are larger than this average particle size, and 35% are smaller than the average particle size. has a particle size distribution of 65%.
尚、この発明の塗材において、例えば炭化珪素の粉体が
バインダーと均一に分散した状態に保たれるようにその
比重差による沈殴を防止するためなど、本発明の目的を
妨げない範囲の微量の添加剤の添加は一員に差支えない
。In addition, in the coating material of the present invention, for example, in order to prevent sinking due to the difference in specific gravity so that the silicon carbide powder is maintained in a uniformly dispersed state with the binder, the purpose of the present invention is not hindered. Adding a small amount of additives does not cause any problem.
またこの発明の焼成原料付着防止方法では、七メント等
のクリンカー焼成設備における耐火材壁面へ焼成原料付
着防止用塗装を施すに際し、前記壁面に前記本発明に係
る焼成原料付着防止用塗材の表面塗膜層を形成するもの
である。Furthermore, in the method for preventing the adhesion of firing raw materials of the present invention, when applying a coating for preventing the adhesion of firing raw materials according to the present invention to the wall surface of a refractory material in clinker firing equipment such as Shichiment, the coating material for preventing the adhesion of firing raw materials according to the present invention is applied to the wall surface. It forms a coating layer.
また好ましくは前記壁面上に前記本発明に係る焼成原料
付着防止用塗材で下地塗装膜を塗布形成し、次いで結合
材層を塗装した上に前記表面塗膜層を形成する。この場
合、前記下地塗装膜と結合材層とを複数層に重ねたのち
に前記表面塗膜層を形成するようにしてもよい。Preferably, a base coating film is formed on the wall surface using the coating material for preventing adhesion of firing raw materials according to the present invention, and then a binder layer is applied, and then the surface coating layer is formed. In this case, the surface coating layer may be formed after the base coating film and the binder layer are stacked in multiple layers.
前記結合材層は、アルミナ、シリカ等の耐熱結合材粉の
一種以上と、澱粉、珪酸アルミ、珪酸ソーダ等の展着物
質粉の一種以上とを水に分散させて糊状にした結合材塗
材により形成する。The binder layer is a binder coating made by dispersing in water one or more heat-resistant binder powders such as alumina and silica and one or more spreader powders such as starch, aluminum silicate, and sodium silicate. Formed by material.
この場合、前記結合材層が最終的に一部でも表面に現れ
ないように、前記表面塗膜層によって前記結合材層の極
力全面を覆うことが望ましい。In this case, it is desirable to cover the entire surface of the binder layer as much as possible with the surface coating layer so that even a part of the binder layer does not appear on the surface.
炭化珪素（ＳｉＣ）は、よ（知られているようにアルカ
リ反応を起こしにくい成分であり、耐火度も高（、化学
的に安定で、還元性雰囲気にも強く、耐食性にも優れた
性質をもっている。反面、硬い物質であるためにその加
工性が悪く、熱伝導率が高いため断熱降下に乏しく、従
って炭化珪素単体のレンガとしては高価となってしまい
、問題の箇所での使用は現実的でない。Silicon carbide (SiC) is known to be a component that does not easily cause alkaline reactions, has high fire resistance, is chemically stable, is resistant to reducing atmospheres, and has excellent corrosion resistance. On the other hand, since it is a hard material, its workability is poor, and its high thermal conductivity results in poor adiabatic drop, making it expensive as a single silicon carbide brick, making it unrealistic to use it in problem areas. Not.
この発明の焼成原料付着防止用塗材では、アルミナ、シ
リカ系などの耐火レンガないしキャスタブルの壁表面に
高純度の炭化珪素皮膜を塗装で形成するのに適したもの
となっている。すなわち、高純度炭化珪素粉末とそれを
保持させるためのバインダーおよびキャリアーとしての
分散媒の総てがアルカリ反応を起こさない物質であり、
炭化珪素が均一に分散した糊状の塗材であるので、ノズ
ル等による吹付は塗装で耐火壁表面に塗膜を形成すれば
、焼成設備の稼働開始による加熱で温度上昇するに従っ
て乾燥されて、殆ど単体の炭化珪素皮膜が高い熱同保持
力で耐火壁表面を覆う結果とな゛す、耐火壁表面がアル
カリ反応しにくい皮膜で覆われるようになる。The coating material for preventing adhesion of firing raw materials of the present invention is suitable for forming a high-purity silicon carbide film on the wall surface of refractory bricks or castables made of alumina, silica, etc., by painting. That is, the high-purity silicon carbide powder, the binder for holding it, and the dispersion medium as a carrier are all substances that do not cause an alkaline reaction.
Since it is a paste-like coating material in which silicon carbide is uniformly dispersed, once it is sprayed using a nozzle, etc., and a coating film is formed on the surface of the fireproof wall, it dries as the temperature rises due to heating when the firing equipment starts operating. As a result, the almost single silicon carbide film covers the fireproof wall surface with high thermal retention, and the fireproof wall surface becomes covered with a film that is resistant to alkali reactions.
この発明によって形成される焼成原料付着防止塗膜を厚
く形成させる場合、間に前記結合材層を介在させながら
炭化珪素の糊の塗装を繰り返し、最外表面に炭化珪素皮
膜を形成することで、強固な厚塗り塗膜が形成される。When forming the firing material adhesion prevention coating formed by this invention thickly, by repeatedly applying silicon carbide glue while interposing the binder layer in between, and forming a silicon carbide film on the outermost surface, A strong thick coating is formed.
乙の見切の実施例として準備された付着防止用塗材と結
合材塗材の組成は次の通りである。The compositions of the anti-adhesion coating material and the binding material coating material prepared as Example B of Partition are as follows.
（ｆｉｉ度９０％、平均粒径４Ｑμｍ）澱 粉
５ｗｔＸ ８ｗｔＸ １０ｗ
ｔＸ水 ７５ｗｔ％Ｆ ８２
ｗｔ％ −アルミナ ２１ｗｔ％
ン リ カ １２ｗｔｘ
澱 粉 ８ｗｔＸ水
５９＋ｗｔＸ上記各塗材を用いて実際に行っ
た効果確認試験の実施例を以下に述べる。(fii degree 90%, average particle size 4Qμm) Starch
5wtX 8wtX 10w
tX water 75wt%F 82
wt% - Alumina 21wt% Nlika 12wtx
Starch 8wtX water
59+wtX An example of an effect confirmation test actually conducted using each of the above coating materials will be described below.
＝実施例１＝
Ａ社セメント焼成工場において第１図に示すＰＳキルン
のプレヒーターに本発明に係る前記付着防止用塗材（以
下ＤＮＣという）＆２と前記結合材塗材（以下ＤＳＷと
いう）＆１とによる部分的な焼成原料付着防止塗装の試
験を行った。=Example 1= The adhesion prevention coating material (hereinafter referred to as DNC) &2 and the binder coating material (hereinafter referred to as DSW) &1 according to the present invention were applied to the preheater of the PS kiln shown in Fig. 1 at a cement firing factory of Company A. A test was conducted on partial coating to prevent the adhesion of firing raw materials.
尚、第１図において、１１はロータリーキルン、１２は
前記キルンの原料投入口ハウジング、１３はプレヒータ
ーの第１サイクロン熱交換器で、ノＡッチングを付した
箇所がＤＮＣ塗布部を表す。In FIG. 1, 11 is a rotary kiln, 12 is a raw material inlet housing of the kiln, 13 is a first cyclone heat exchanger of a preheater, and the part marked with an A represents the DNC coating part.
塗布口：昭和６２年８月１２日
塗布箇所：（イ）サイクロン１３の内筒内壁面の２箇所
に約２０−ずつの正方形
（ロ）ハウジング１２の投入口周辺に
約１６ｍ”の円形
何れも壁面の耐火レンガは三方耐火
■製５Ｋ−３２（シャモット系）
塗布方法： ＰＧＬスプレーガンで吹付は塗布１回目（
下塗）＝ＤＮＣ歯２
２回目（中塗）：ＤＳＷＮＩＬ１
３回目（上塗）？ ＤＮＣＮ１２
塗布ｍ：２００ｋｇ （３，３ｋｇ／ゴ）運転開始：昭
和６２年８月１７日（火入れ日）点 検：サイクロン
については運転中は内部点検不可能のため内圧を監視し
、運
転休止中（゛こ限り内部を目視点検した。Application port: August 12, 1988 Application location: (a) Approximately 20 squares each at two locations on the inner wall of the inner cylinder of the cyclone 13. (b) A circular area of approximately 16 m'' around the input port of the housing 12. The firebrick on the wall is made of three-sided fireproof ■ 5K-32 (chamotte type). Application method: Spray with PGL spray gun for the first time (
Undercoat) = DNC tooth 2 2nd coat (intermediate coat): DSWNIL1 3rd coat (top coat)? DNCN12 Coating m: 200 kg (3.3 kg/go) Start of operation: August 17, 1988 (fire-in date) Inspection: As the cyclone cannot be inspected internally during operation, the internal pressure was monitored and the゛I visually inspected the interior.
ハウジング原料投入口周辺について は点検窓より内部を目視により点検 した。結果は以下の通り。About the area around the housing raw material input port Visually inspect the inside through the inspection window. did. The results are as follows.
１回目：昭和６２年８月２４日運転中
サイクロン：内圧変化なし
投入口周辺：コーティング付着なし
２回目：昭和６２年９月２日運転中
サイクロン：内圧変化なし
投入口周辺：コーティング付着なし
３回目：昭和６２年９月７日運転中
サイクロン：内圧変化なし
投入口周辺：コーティング付着なし
４回目：昭和６３年１月６日休転点検
サイクロン：内筒内コーティング付
着なし
尚、昭和６２年９月２０日、数時間の運転臨時休止の際
にサイクロン内筒内部を目視点検したが、ＤＮＣ塗布部
分にはコーティングは付着しておらず、それに対してＤ
ＮＣＮＣ塗布部分には約３０ｃｍ厚さのコーティングが
付着していたのが確認された。1st time: August 24, 1988, during operation Cyclone: No change in internal pressure Around the inlet: No coating adhered 2nd time: September 2, 1988 Cyclone in operation: No change in internal pressure: Around the inlet: No coating adhered 3rd time :September 7, 1988 Cyclone in operation: No change in internal pressure Around the inlet: No coating adhered 4th time: January 6, 1988 Inspection Cyclone stopped: No coating adhered inside the inner cylinder Further, September 1988 On the 20th, during a temporary suspension of operation for several hours, we visually inspected the inside of the cyclone inner cylinder, but found that no coating had adhered to the DNC application area.
It was confirmed that a coating approximately 30 cm thick had adhered to the NCNC applied area.
＝実施例２＝
Ｂ社セメント焼成工場において第２図に示すＰＳキルン
のプレヒーター用サイクロンに本発明に係る前記付着防
止用塗材ＤＮＣと前記結合材塗材ＤＳＷとによる部分的
な焼成原料付着防＋１：塗装の試験を行った。=Example 2= Partial adhesion of the firing raw material by the adhesion prevention coating material DNC and the binder coating material DSW according to the present invention to the preheater cyclone of the PS kiln shown in FIG. 2 at the cement firing factory of Company B. Prevention +1: A coating test was conducted.
尚、第２図において２１はロータリーキルン、２２は前
記キルンの原料投入口ハウジング、２３および２４はサ
イクロン熱交換器で、斜線部分はＤＮＣ塗布部を表す。In FIG. 2, 21 is a rotary kiln, 22 is a raw material inlet housing of the kiln, 23 and 24 are cyclone heat exchangers, and the shaded area represents a DNC coating section.
塗布口：昭和６２年９月３０日
塗布箇所：サイクロン２３．２４の西側内筒と内壁に２
０ｍ′ずつの正方形２箇所、天井部に８−及び西側柱立
上り部に６ｄ
壁面の耐火レンガは第１剛火■製
５Ｋ−３４（シャモット系）
塗布方法：ＰＧＬスプレーガンで吹付は塗布１回目（下
塗）ｊ ＤＮＣ＆１
２回目（中塗）：ＤＳＷＳｉ
Ｂ６目（上塗）： ＤＮＣ＆２
塗布量： １８０ｋｇ （３、４ｋｇ／ ｍ）運転開始
：昭和６２年１０月２日（火入れ日）点 検：運転中
は点検口より側面部および上部をパールで触ってコーテ
ィング層
の有無を確認した。Application port: September 30, 1988 Application location: 2 on the west inner cylinder and inner wall of Cyclone 23 and 24
2 square locations of 0m' each, 8-meter on the ceiling and 6-meter on the rising part of the west pillar.The fireproof brick on the wall is 5K-34 (chamotte type) made by Daiichi Goka. Application method: Spraying with a PGL spray gun is the first application. (Undercoat) j DNC & 1 2nd coat (intermediate coat): DSWSi B6 (top coat): DNC & 2 Coating amount: 180 kg (3,4 kg/m) Start of operation: October 2, 1986 (fire-in date) Inspection: During operation The presence or absence of the coating layer was checked by touching the side and top parts with a pearl through the inspection port.
運転休止中は内部を目視により点検 した。結果は以下の通り。Visually inspect the interior during suspension of operation did. The results are as follows.
１回目：昭和６２年１０月１３日運転中塗布部：コーテ
ィング付着なし
未塗布部：コーティング付着７〜８■
２回目：昭和６２年１２月９日休転点検塗布部：コーテ
ィング付着なし
未塗布部：多い所で厚さ４０〜５０ｃｍのコーティング
付着有り
＝実施例３＝
Ｃ社セメント焼成工場において第３図に示すロータリー
キルンのプレヒーター用サイクロンに本発明に係る前記
付着防止用塗材ＤＮＣと前記結合材塗材ＤＳＷとによる
部分的な焼成原料付着防止塗装の試験を行った。1st time: October 13, 1985 Application area during operation: No coating adhered Unapplied area: Coating adhesion 7 to 8■ 2nd time: December 9, 1988 Stop inspection Applicable area: No coating adhesion Unapplied area : Coating with a thickness of 40 to 50 cm was adhered in many places = Example 3 = The adhesion prevention coating material DNC according to the present invention and the above combination were applied to a cyclone for a preheater of a rotary kiln shown in FIG. 3 at a cement firing factory of Company C. A test was conducted to partially prevent the adhesion of firing raw materials using the wood coating material DSW.
尚、第２図において３１はロータリーキルン、３２は前
記キルンの原料投入口ハウジング、３３および３４はサ
イクロン熱交換器、３５はクーラーで、ｆ４ｍ部分はＤ
ＮＣ塗布部を表す。In Fig. 2, 31 is a rotary kiln, 32 is a raw material input port housing of the kiln, 33 and 34 are cyclone heat exchangers, 35 is a cooler, and f4m part is D.
It represents the NC coating part.
塗布臼：昭和６２年１０月２１日
塗布箇所：サイクロン３３の内筒内壁面に２０ｒｎ’の
正方形１箇所、およびサイクロン
３４の下部内壁面に１０ｒｎ’の正方形耐火レンガは５
Ｋ−３４（シャモット系）塗布方法： ＰＧＬスプレー
ガンで吹付は塗布１回目（下塗）ｎＤＮＣ勲１
２回目（中塗）：ＤｓＷ血１
３回目（上塗）： ＤＮＣ＆３
塗布量：９０ｋｇ（３ｋｇ／ゴ）
運転開始：昭和６２年１０月２２日（火入れ口）点
検：運転中はサイクロン内圧を圧力計で監視ルな。Application mortar: October 21, 1988 Application location: 1 square of 20rn' on the inner wall of the inner cylinder of Cyclone 33, and 5 square refractory bricks of 10rn' on the inner wall of the lower part of Cyclone 34.
K-34 (chamotte type) application method: Sprayed with PGL spray gun 1st coat (undercoat) n DNC Ion 1 2nd coat (intermediate coat): DsW Blood 1 3rd coat (top coat): DNC & 3 Coating amount: 90 kg (3 kg/go) Start of operation: October 22, 1986 (fire opening)
Inspection: During operation, monitor the cyclone internal pressure with a pressure gauge.
運転休止中は内部を目視により点検 した。結果は以下の通り。Visually inspect the interior during suspension of operation did. The results are as follows.
１回目：昭和６２年１２月２８日
火入れ後、この日までコーティング
付着による内圧変化なし
２回目：昭和６３年１月１３日休転点検塗布部：コーテ
ィング付着なし
未塗布部：多い所で厚さ５０ｃｍを超えるコーティング
付着有り
〔発明の効果〕
通常のこの種の焼成設備においては、耐火壁はシャモッ
ト系またはへイアルミナ系の耐火レンガ或いは耐火キャ
スタブルが多用されており、アルミナやシリカ等の成分
がアルカリ反応を起こして前述コーティング層の強固な
付着を生じる。また炭化珪素を熱硬化セメントに混合し
たキャスタブルも試みられているが・セメントに含有さ
れている炭化珪素以外の成分がやはりアルカリ反応を起
こすので、コーティング層の付着は不可避であり、その
除去作業が多少楽になるにしても依然として数日置きに
は必要であった。1st time: December 28, 1985 After firing, there was no change in internal pressure due to coating adhesion until this day. 2nd time: January 13, 1988 Shutdown Inspection Applied area: No coating adhesion Unapplied area: Thickness in many places More than 50 cm of coating adhered [Effect of the invention] In ordinary firing equipment of this type, chamotte-based or heir alumina-based fire bricks or fire-resistant castables are often used for fireproof walls, and components such as alumina and silica are alkali-based. A reaction occurs resulting in a strong adhesion of the coating layer. Castables made by mixing silicon carbide with thermosetting cement have also been attempted, but since components other than silicon carbide contained in the cement still cause an alkaline reaction, adhesion of the coating layer is inevitable, and its removal is difficult. Even though it felt a little better, I still needed it every few days.
この発明によれば、単純な糊状塗材を塗装するだけで耐
火壁表面を高純度の炭化珪素のほぼ単体の皮膜で被覆で
きることになり、従って耐火壁がアルカリ反応から保護
されるので、付着コーティング層は単にその粘着性のみ
によって付着するだけとなり、原料粉体の気流ながれや
衝撃により外から手を加えなくても自然に剥離してしま
う程度となる。その結果、従来頻繁に行っていたコーテ
ィング除去作業は、前述効果確認試験例にも明らかなよ
うに、塗膜形成後の火入れ開始から数ケ月を経過するも
未だに不要であり、耐火壁のレンガ寿命がくるまで行わ
ずともよくなることが期待され、除去作業に伴っていた
熱損失の発生や稼働効率低下が避けられるようになるも
のである。According to this invention, the surface of a fireproof wall can be coated with a nearly single layer of high-purity silicon carbide by simply applying a paste-like coating material, and the fireproof wall is therefore protected from alkaline reactions, resulting in less adhesion. The coating layer simply adheres due to its tackiness, and it will peel off naturally due to the air flow or impact of the raw material powder without any external intervention. As a result, the coating removal work, which was frequently performed in the past, is still unnecessary even after several months have passed since the start of firing after the coating film was formed, as is clear from the above-mentioned effectiveness confirmation test example, and the lifespan of the bricks in the fire-resistant wall has increased. It is expected that it will no longer be necessary to perform the removal process until the end of the removal process, and the heat loss and reduction in operating efficiency that were associated with removal work will be avoided.
第１図はこの発明の一実施例に係る焼成原料付着防止塗
装の適用箇所を示すＰＳキルンのサスベンジジンプレヒ
ーターの要部構成説明図、第２図は同じく別の実施例の
適用箇所を示すキルン原料投入口付近の要部斜視図、第
３図は同じく更に別の実施例の適用箇所を示すＰＳキル
ンの要部構成説明図である。
１１．２１，３１： ｏ−タリーキルン、１２゜２２．
３２．：キルンの原料投入口ハウジング、１３．２３，
２４，３３，３４： プレヒーターのサイクロン熱交換
器、３５：クーラー。Fig. 1 is an explanatory diagram of the main part of a suspension gin preheater for a PS kiln, showing the application points of the baking material adhesion prevention coating according to one embodiment of the present invention, and Fig. 2 shows the application locations of another embodiment. FIG. 3 is a perspective view of the main parts near the kiln raw material input port, and is also an explanatory view of the main part configuration of the PS kiln showing the application area of still another embodiment. 11.21,31: o-tally kiln, 12°22.
32. :Kiln raw material inlet housing, 13.23,
24, 33, 34: Preheater cyclone heat exchanger, 35: Cooler.
Claims (1)
面への焼成原料付着防止用塗材であって、主成分として
の高純度炭化珪素粉末を、少量の非アルカリ反応性バイ
ンダーと共に水または鉱物油もしくは合成油のうちから
選ばれた分散媒に均一に分散させて糊状を呈するように
してなることを特徴とする焼成原料付着防止用塗材。 ２．高純度炭化珪素粉末を２０〜７０重量％と、非アル
カリ反応性バインダーを３〜２０重量％と、残部分散媒
とからなる組成を有する請求項１に記載の焼成原料付着
防止用塗材。 ３．非アルカリ反応性バインダーとして澱粉を用い、分
散媒として水を用いた請求項１〜２のいずれかに記載の
焼成原料付着防止用塗材。 ４．セメント等のクリンカー焼成設備における耐火材壁
面への焼成原料付着防止用塗材であって、主成分として
高純度炭化珪素粉末を２０〜４０重量％、バインダーと
して澱粉を５〜１０重量％含み、これらを水に均一に分
散させて糊状にしてなることを特徴とする焼成原料付着
防止用塗材。 ５．高純度炭化珪素粉末が、純度９０％以上のものであ
る請求項１〜４のいずれかに記載の焼成原料付着防止用
塗材。 ６．高純度炭化珪素粉末が、粒径５〜３００μｍのもの
である請求項１〜５のいずれかに記載の焼成原料付着防
止用塗材。 ７．高純度炭化珪素粉末が、平均粒径４０μｍで、且つ
粒径４０μ以上のものが３５％、粒径４０μ未満のもの
が６５％の粒度分布をもつものである請求項１〜６のい
ずれかに記載の焼成原料付着防止用塗材。 ８．セメント等のクリンカー焼成設備における耐火材壁
面へ焼成原料付着防止用塗装を施すに際し、前記壁面に
請求項１〜７のいずれかに記載の焼成原料付着防止用塗
材の表面塗膜層を形成することを特徴とする焼成原料付
着防止方法。 ９．前記壁面上に請求項１〜７のいずれかに記載の塗材
で下地塗装膜を塗布形成し次いで結合材層を塗装した上
に前記表面塗膜層を形成する請求項８に記載の焼成原料
付着防止方法。 １０．下地塗装膜と結合材層とを複数層に重ねたのちに
前記表面塗膜層を形成する請求項９に記載の焼成原料付
着防止方法。 １１．結合材層を、アルミナ，シリカ等の耐熱結合材粉
の一種以上と、澱粉，珪酸アルミ，珪酸ソーダ等の展着
物質粉の一種以上とを水に分散させて糊状にした結合材
塗材により形成する請求項８〜１０に記載の焼成原料付
着防止方法。[Claims] 1. A coating material for preventing the adhesion of firing raw materials to the wall surface of refractory materials in clinker firing equipment such as cement, which comprises high purity silicon carbide powder as the main component, together with a small amount of non-alkali reactive binder. A coating material for preventing the adhesion of firing raw materials, characterized in that it is uniformly dispersed in a dispersion medium selected from water, mineral oil, or synthetic oil to form a paste-like appearance. 2. The coating material for preventing adhesion of firing raw materials according to claim 1, having a composition comprising 20 to 70% by weight of high-purity silicon carbide powder, 3 to 20% by weight of a non-alkali reactive binder, and the remainder a dispersant. 3. The coating material for preventing adhesion of firing raw materials according to any one of claims 1 to 2, wherein starch is used as the non-alkali reactive binder and water is used as the dispersion medium. 4. A coating material for preventing the adhesion of firing raw materials to refractory walls in clinker firing equipment such as cement, containing 20 to 40% by weight of high-purity silicon carbide powder as the main component and 5 to 10% by weight of starch as a binder. A coating material for preventing the adhesion of firing raw materials, characterized by being made into a paste by uniformly dispersing it in water. 5. The coating material for preventing adhesion of firing raw materials according to any one of claims 1 to 4, wherein the high-purity silicon carbide powder has a purity of 90% or more. 6. The coating material for preventing adhesion of firing raw materials according to any one of claims 1 to 5, wherein the high-purity silicon carbide powder has a particle size of 5 to 300 μm. 7. 7. The high-purity silicon carbide powder has an average particle size of 40 μm and a particle size distribution of 35% of the particles having a particle size of 40 μm or more and 65% of the particles having a particle size of less than 40 μm. Coating material for preventing adhesion of firing raw materials as described. 8. When applying a coating for preventing the adhesion of firing raw materials to a wall surface of a refractory material in clinker firing equipment such as cement, a surface coating layer of the coating material for preventing adhesion of firing raw materials according to any one of claims 1 to 7 is formed on the wall surface. A method for preventing adhesion of firing raw materials. 9. The firing raw material according to claim 8, wherein a base coating film is formed by applying the coating material according to any one of claims 1 to 7 on the wall surface, and then a binder layer is applied, and then the surface coating layer is formed. How to prevent adhesion. 10. 10. The method for preventing adhesion of firing raw materials according to claim 9, wherein the surface coating layer is formed after laminating a plurality of base coating films and binder layers. 11. A binder coating material in which the binder layer is made into a paste by dispersing in water one or more heat-resistant binder powders such as alumina and silica, and one or more spreader powders such as starch, aluminum silicate, and sodium silicate. The method for preventing adhesion of firing raw materials according to claims 8 to 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63015872A JPH01192774A (en) | 1988-01-28 | 1988-01-28 | Coating material for preventing adhesion of calcination raw material and use thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63015872A JPH01192774A (en) | 1988-01-28 | 1988-01-28 | Coating material for preventing adhesion of calcination raw material and use thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01192774A true JPH01192774A (en) | 1989-08-02 |
| JPH0477700B2 JPH0477700B2 (en) | 1992-12-09 |
Family
ID=11900891
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63015872A Granted JPH01192774A (en) | 1988-01-28 | 1988-01-28 | Coating material for preventing adhesion of calcination raw material and use thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01192774A (en) |
-
1988
- 1988-01-28 JP JP63015872A patent/JPH01192774A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0477700B2 (en) | 1992-12-09 |
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