JP2003238251A - Refractory with metal chromium carbide as aggregate and plasma ash fusion furnace using the same - Google Patents
Refractory with metal chromium carbide as aggregate and plasma ash fusion furnace using the sameInfo
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- JP2003238251A JP2003238251A JP2002039222A JP2002039222A JP2003238251A JP 2003238251 A JP2003238251 A JP 2003238251A JP 2002039222 A JP2002039222 A JP 2002039222A JP 2002039222 A JP2002039222 A JP 2002039222A JP 2003238251 A JP2003238251 A JP 2003238251A
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明はプラズマ灰溶融炉本
体の出滓口を構成する耐火物およびそれを使用したプラ
ズマ灰溶融炉に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refractory material forming a slag opening of a plasma ash melting furnace body and a plasma ash melting furnace using the refractory material.
【０００２】[0002]
【従来の技術】従来より、都市ごみ及び産業廃棄物の焼
却により生じる焼却灰は、最終処分場の延命化及び二次
公害防止対策として溶融固化されてスラグとして回収さ
れている。スラグとして回収された焼却灰は、有害物質
が溶出する恐れが無く、土木、建築材料として再利用が
出来るために、かかる方法は広く普及している。焼却灰
をスラグ化する溶融炉のうち、プラズマ灰溶融炉は、円
筒形状を有する鉄製炉本体と、該炉本体の内壁を被覆す
る耐火物と、炉蓋から挿入されて垂れ下がる主電極と、
これに対向して炉下部から挿入される電極とを備えてい
る。2. Description of the Related Art Conventionally, incinerated ash generated by incineration of municipal waste and industrial waste is melted and solidified and collected as slag as a measure to prolong the life of a final disposal site and prevent secondary pollution. Since the incineration ash collected as slag has no fear of eluting harmful substances and can be reused as civil engineering and building materials, such a method is widely used. Among the melting furnaces to slag the incinerated ash, the plasma ash melting furnace is an iron furnace body having a cylindrical shape, a refractory material that covers the inner wall of the furnace body, and a main electrode that is inserted from the furnace lid and hangs down.
And an electrode inserted from the lower part of the furnace so as to be opposed thereto.
【０００３】かかるプラズマ灰溶融炉は、灰ホッパから
投入される焼却灰が定量供給機により該溶融炉に移送さ
れ、前記焼却灰は、直流電源に接続された主電極と対電
極の間に発生したアークによりプラズマ状態となった炉
内に導入される。このとき、炉頂部から供給されるＮ2
ガス等の不活性ガスにより炉内は還元性雰囲気に保たれ
ている。プラズマ高温ガス流により１５００℃以上の温
度で溶融された溶融スラグは溶融メタルから分離して出
滓口より排出されてスラグが生成され、様々な用途で再
利用される。In such a plasma ash melting furnace, incineration ash fed from an ash hopper is transferred to the melting furnace by a constant quantity feeder, and the incineration ash is generated between a main electrode and a counter electrode connected to a DC power source. It is introduced into the furnace which is made into a plasma state by the arc. At this time, N 2 supplied from the furnace top
The furnace is kept in a reducing atmosphere by an inert gas such as gas. The molten slag melted at a temperature of 1500 ° C. or higher by the plasma high-temperature gas flow is separated from the molten metal and discharged from the outlet to generate slag, which is reused for various purposes.
【０００４】しかしながら、溶融処理される焼却灰は腐
食性が高く、とくに出滓口周りの耐火物については腐食
速度が著しいために、短期間での交換を余儀なくされて
いる。出滓口周りの耐火物としては、ＳｉＣ系等の非酸
化物系耐火物とＡｌ2Ｏ3系等の酸化物系耐火物の２種類
が用いられている。ＳｉＣ系耐火物は熱伝導率が高く、
冷却によって耐火物表面の温度を低減して耐食性を向上
するものであり、Ａｌ 2Ｏ3系耐火物は、溶融酸化物に対
する溶解度が低く、本質的に耐食性が高い耐火物であ
る。However, the incinerated ash to be melt-processed is spoiled.
Highly corrosive, especially the refractory around the outlet is corroded
The speed is so fast that we have to replace it in a short time.
There is. Refractory around the outlet is non-acid such as SiC
Compound refractories and Al2O3Two types of oxide-based refractory materials
Is used. SiC refractories have high thermal conductivity,
Cooling reduces the refractory surface temperature and improves corrosion resistance
That is, Al 2O3Refractory-based materials are
It is a refractory with low solubility and essentially high corrosion resistance.
It
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、ＳｉＣ
系耐火物は酸化損耗により侵食を受け、このために、腐
食速度を耐火物耐食性の目安となる０．０５ｍｍ／ｈ程
度まで低減するためには耐火物表面温度を１１００℃程
度まで低減する必要があるが、出滓性や炉径を考慮する
と１２００℃以下への耐火物温度低減は難しい。また、
Ａｌ2Ｏ3系耐火物は、材質に頼るものであり、冷却なし
で腐食速度を０．０５ｍｍ／ｈ以下まで低減することは
難しい。本発明はかかる従来技術の問題に鑑み、酸化特
性高く、冷却構造が取れる非酸化物系耐火物で、酸化し
ても溶解度が低い酸化物系耐火物と同じ組成となる高耐
食性の金属クロム炭化物を骨材とする耐火物の提供を目
的とする。さらに、この耐火物を炉本体の出滓口に使用
したプラズマ灰溶融炉の提供を目的とする。[Problems to be Solved by the Invention] However, SiC
The refractory system is corroded by oxidative wear. Therefore, in order to reduce the corrosion rate to about 0.05 mm / h, which is a measure of refractory corrosion resistance, it is necessary to reduce the refractory surface temperature to about 1100 ° C. However, it is difficult to reduce the refractory temperature to 1200 ° C or lower considering the slagging property and furnace diameter. Also,
Al 2 O 3 -based refractories depend on the material, and it is difficult to reduce the corrosion rate to 0.05 mm / h or less without cooling. In view of the problems of the prior art, the present invention is a non-oxide refractory having a high oxidation property and a cooling structure, and a high corrosion resistance metal chromium carbide having the same composition as the oxide refractory having a low solubility even when oxidized. The purpose is to provide a refractory material containing Ag. Furthermore, another object of the present invention is to provide a plasma ash melting furnace in which this refractory material is used for the outlet of the furnace body.
【０００６】[0006]
【課題を解決するための手段】そこで、本発明はかかる
課題を解決するために、熱伝導率がＳｉＣ並に高く酸化
しても溶解度が低い酸化物系耐火物と同じ組成となる、
Ｃｒ3Ｃ2の金属クロム炭化物を耐火物の骨材とする適用
を検討した。Ｃｒ3Ｃ2は酸化によりＣｒ2Ｏ3となるが、
何れも２０７５℃という高融点で、溶融酸化物に対する
溶解度が小さい酸化物として知られている。また、耐火
物全体の耐食性を大きく左右する耐火物マトリックスと
して、Ｃｒ3Ｃ2単体より耐食性のより高いＣｒ2Ｏ3―Ａ
ｌ2Ｏ3―ＴｉＯ2系酸化物で形成し、材質としての耐食
性を向上させることを検討した。In order to solve such a problem, the present invention has the same composition as an oxide refractory having a high thermal conductivity as high as that of SiC and a low solubility even when oxidized.
The application of Cr 3 C 2 metal chromium carbide as the refractory aggregate was investigated. Cr 3 C 2 becomes Cr 2 O 3 by oxidation,
Both are known as oxides having a high melting point of 2075 ° C. and low solubility in molten oxide. Further, as a refractory matrix that greatly affects the corrosion resistance of the entire refractory, Cr 2 O 3 -A having higher corrosion resistance than Cr 3 C 2 alone is used.
It was studied to improve the corrosion resistance as a material by forming it with an l 2 O 3 —TiO 2 type oxide.
【０００７】本発明はかかる知見に基づいてなされたも
のであって、Ｃｒ3Ｃ2の金属クロム炭化物を骨材とし、
Ｃｒ2Ｏ3―Ａｌ2Ｏ3―ＴｉＯ2系酸化物をマトリックス
とするＣｒ3Ｃ2―Ｃｒ2Ｏ3―Ａｌ2Ｏ3―ＴｉＯ2系組成
物であることを特徴とする金属クロム炭化物を骨材とす
る耐火物である。また、Ｃｒ3Ｃ2の金属クロム炭化物の
量が全体の組成物重量に対し重量％で６０ｗｔ％を超え
ると、熱伝導率が高くなり冷却構造がとれるので好まし
い。さらに、耐食性の高い耐火物マトリックスとしては
Ｃｒ2Ｏ3―Ａｌ2Ｏ3―ＴｉＯ2系酸化物が重量％でＣｒ2
Ｏ3とＡｌ2Ｏ3の合計に対してＣｒ2Ｏ3の割合が３９〜
１００ｗｔ％、同じくＡｌ2Ｏ3の割合が０〜６１ｗｔ
％、粉末全体に対するＴｉＯ2の割合が０．２６〜４．
４ｗｔ％であることが好ましい。The present invention has been made on the basis of the above findings, in which Cr 3 C 2 metal chromium carbide is used as an aggregate,
A metal chromium carbide characterized by being a Cr 3 C 2 —Cr 2 O 3 —Al 2 O 3 —TiO 2 -based composition having a Cr 2 O 3 —Al 2 O 3 —TiO 2 based oxide as a matrix. It is a refractory used as an aggregate. Further, it is preferable that the amount of the chromium metal carbide of Cr 3 C 2 exceeds 60 wt% in weight% with respect to the total weight of the composition, because the thermal conductivity becomes high and a cooling structure can be obtained. Further, as a refractory matrix having high corrosion resistance, Cr 2 O 3 —Al 2 O 3 —TiO 2 type oxide is contained in a weight percentage of Cr 2
The ratio of Cr 2 O 3 to the total of O 3 and Al 2 O 3 is 39 to
100 wt%, the proportion of Al 2 O 3 is 0 to 61 wt%
%, The ratio of TiO 2 to the entire powder is 0.26 to 4.
It is preferably 4 wt%.
【０００８】また、Ｃｒ3Ｃ2の金属クロム炭化物を骨材
とし、Ｃｒ2Ｏ3―Ａｌ2Ｏ3―ＴｉＯ 2系酸化物をマトリ
ックスとするＣｒ3Ｃ2―Ｃｒ2Ｏ3―Ａｌ2Ｏ3―ＴｉＯ2
系組成物の耐火物を炉本体の出滓口の耐火物として使用
したことを特徴とするプラズマ灰溶融炉である。さら
に、耐火物の骨材としてＣｒ3Ｃ2の金属クロム炭化物の
量が全体の組成物重量に対し重量％で６０ｗｔ％を超
え、耐火物マトリックスとしてＣｒ2Ｏ3―Ａｌ2Ｏ3―Ｔ
ｉＯ2系酸化物が重量％でＣｒ2Ｏ3とＡｌ2Ｏ3の合計に
対してＣｒ2Ｏ3の割合が３９〜１００ｗｔ％、同じくＡ
ｌ2Ｏ3の割合が０〜６１ｗｔ％、粉末全体に対するＴｉ
Ｏ2の割合が０．２６〜４．４ｗｔ％である高い耐食性
と熱伝導率を兼備した耐火物を炉本体の出滓口の耐火物
として使用したことを特徴とするプラズマ灰溶融炉が好
ましい。Also, Cr3C2Aggregate of metal chromium carbide
And Cr2O3-Al2O3-TiO 2System oxides
Cr with x3C2-Cr2O3-Al2O3-TiO2
Use refractory of system composition as refractory at outlet of furnace body
It is a plasma ash melting furnace characterized by the above. Furthermore
And Cr as the refractory aggregate3C2Of metal chrome carbide
The amount exceeds 60 wt% in weight% with respect to the total composition weight.
E, Cr as a refractory matrix2O3-Al2O3-T
iO2Cr based on wt%2O3And Al2O3To the sum of
To Cr2O3The proportion of 39 to 100 wt%, also A
l2O3Of 0 to 61 wt%, Ti to the entire powder
O2Corrosion resistance with the proportion of 0.26 to 4.4 wt%
And the thermal conductivity of the refractory at the outlet of the furnace body
The plasma ash melting furnace, which is characterized by being used as
Good
【０００９】[0009]
【発明の実施の形態】次に、本発明の金属クロム耐火物
を骨材とする耐火物の組成の限定理由について説明す
る。BEST MODE FOR CARRYING OUT THE INVENTION Next, the reasons for limiting the composition of a refractory material having the metal chromium refractory material of the present invention as an aggregate will be described.
【００１０】耐火物の骨材：耐食性に優れ、かつ熱伝導
率の高い骨材としてＣｒ3Ｃ2を選択した。特に８ｋｃａ
ｌ／ｍ・ｈ・℃以上の高い熱伝導率の耐火物を得るため
にはＣｒ3Ｃ2の量を耐火物全体の組成物重量に対し重量
％で６０ｗｔ％を超えるのが好ましい。ただし、あまり
多くなりすぎると、耐火物マトリックスの量が少なくな
り、耐食性の観点から望ましくない。したがって、９５
ｗｔ％以下とすることが望ましい。耐火物マトリック
ス：耐火物全体の耐食性を左右するのが耐火物マトリッ
クスであり、骨材のＣｒ3Ｃ2より耐食性が高いＣｒ2Ｏ3
に着目し、安定した複合酸化物としてＣｒ2Ｏ3―Ａｌ2
Ｏ3―ＴｉＯ2系酸化物を選択した。耐食性が高い耐火物
マトリックスとしては、重量％でＣｒ2Ｏ3とＡｌ2Ｏ3の
合計に対してＣｒ2Ｏ3の割合が３９〜１００ｗｔ％、同
じくＡｌ2Ｏ3の割合が０〜６１ｗｔ％、粉末全体に対す
るＴｉＯ2の割合が０．２６〜４．４ｗｔ％とすること
が好ましい。Refractory Aggregate: Cr 3 C 2 was selected as an aggregate having excellent corrosion resistance and high thermal conductivity. Especially 8 kca
In order to obtain a refractory material having a high thermal conductivity of 1 / m · h · ° C. or higher, the amount of Cr 3 C 2 is preferably more than 60 wt% in weight% with respect to the composition weight of the entire refractory material. However, if the amount is too large, the amount of the refractory matrix becomes small, which is not desirable from the viewpoint of corrosion resistance. Therefore, 95
It is desirable to set it to be wt% or less. Refractory matrix: The refractory matrix determines the corrosion resistance of the entire refractory, and Cr 2 O 3 has higher corrosion resistance than the aggregate Cr 3 C 2.
Paying attention to the above, Cr 2 O 3 --Al 2 as a stable composite oxide
An O 3 —TiO 2 type oxide was selected. As a refractory matrix having high corrosion resistance, the proportion of Cr 2 O 3 is 39 to 100 wt% and the proportion of Al 2 O 3 is 0 to 61 wt% with respect to the total of Cr 2 O 3 and Al 2 O 3 in % by weight. It is preferable that the ratio of TiO 2 to the whole powder is 0.26 to 4.4 wt%.
【００１１】[0011]
【実施例】本発明の好適な実施例を図面に基づいて説明
する。図１は本発明の耐火物マトリックスを構成する構
成するＣｒ2Ｏ3―Ａｌ2Ｏ3―ＴｉＯ2系酸化物の組成範
囲を示す図である。図１より耐食性が高い好ましい組成
範囲は、重量％でＣｒ2Ｏ3とＡｌ2Ｏ3の合計に対してＣ
ｒ2Ｏ3の割合が３９〜１００ｗｔ％、同じくＡｌ2Ｏ3の
割合が０〜６１ｗｔ％、粉末全体に対するＴｉＯ2の割
合が０．２６〜４．４ｗｔ％である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing a composition range of Cr 2 O 3 --Al 2 O 3 --TiO 2 based oxide constituting the refractory matrix of the present invention. A preferable composition range having higher corrosion resistance than that in FIG. 1 is C with respect to the total of Cr 2 O 3 and Al 2 O 3 in % by weight.
The ratio of r 2 O 3 is 39 to 100 wt%, the ratio of Al 2 O 3 is 0 to 61 wt%, and the ratio of TiO 2 to the whole powder is 0.26 to 4.4 wt%.
【００１２】図２は１３００℃における本発明の耐火物
を構成する組成物におけるＣｒ3Ｃ2配合量と耐火物の腐
食速度との関係を示す図である。耐火物を構成する耐火
物マトリックスのＣｒ2Ｏ3―Ａｌ2Ｏ3―ＴｉＯ2系酸化
物は、何れも平均粒径が０．２μｍのＣｒ2Ｏ3粉末、Ａ
ｌ2Ｏ3粉末、ＴｉＯ2粉末をそれぞれ８７．３ｗｔ％、
１０．４ｗｔ％、２．３ｗｔ％の配合量として、水を溶
媒としたボールミルで１００時間混合し、乾燥したもの
を大気中１６００℃で仮焼してＣｒ2Ｏ3―Ａｌ 2Ｏ3―Ｔ
ｉＯ2固溶体を作製した。FIG. 2 shows the refractory material of the present invention at 1300 ° C.
In the composition constituting3C2Mixing amount and refractory rot
It is a figure which shows the relationship with an eating speed. Fire resistance that constitutes refractory
Material matrix Cr2O3-Al2O3-TiO2System oxidation
All of the products are Cr with an average particle size of 0.2 μm.2O3Powder, A
l2O3Powder, TiO287.3 wt% of each powder,
Dissolve water with a compounding amount of 10.4 wt% and 2.3 wt%
Mixed in a ball mill for 100 hours and dried
Is calcined at 1600 ° C in the atmosphere and Cr2O3-Al 2O3-T
iO2A solid solution was prepared.
【００１３】次に得られた固溶体を粉砕し、５ｍｍ−３
ｍｍ、３ｍｍ−１ｍｍ、１ｍｍ以下の大きさとなるよう
に整粒した。耐火物を構成する骨材のＣｒ3Ｃ2について
は、平均粒径３μｍの粉末をＡｒ雰囲気中で１５００℃
で焼結し、５ｍｍ−３ｍｍ、３ｍｍ−１ｍｍ、１ｍｍ以
下の大きさとなるように整粒した。耐火物は粒径５ｍｍ
−３ｍｍ、３ｍｍ−１ｍｍ、１ｍｍ以下のものを各々４
０、３０及び３０ｖｏｌ％となるように配合し、Ａｒ雰
囲気中で１５００℃で焼結して作製した。また、Ｃｒ2
Ｏ3―Ａｌ2Ｏ3―ＴｉＯ2固溶体の作製では、１ｍｍ以下
のものから配合してゆき、配合量が大きくなるのにした
がって３ｍｍ−１ｍｍ、５ｍｍ−３ｍｍのものを配合す
るようにした。Next, the obtained solid solution was crushed to obtain 5 mm-3.
mm, 3 mm-1 mm, 1 mm or less. Regarding Cr 3 C 2 which is an aggregate that constitutes a refractory, a powder having an average particle diameter of 3 μm is 1500 ° C. in an Ar atmosphere.
And was sized to have a size of 5 mm-3 mm, 3 mm-1 mm, 1 mm or less. Refractory has a particle size of 5 mm
-3 mm, 3 mm-1 mm, 1 mm or less 4 each
It was prepared by blending so as to be 0, 30 and 30 vol% and sintering at 1500 ° C. in an Ar atmosphere. Also, Cr 2
In the preparation of the solid solution of O 3 —Al 2 O 3 —TiO 2 , 1 mm or less was compounded, and 3 mm-1 mm and 5 mm-3 mm were compounded as the compounding amount increased.
【００１４】腐食試験は、大気中で耐火物を１３００℃
の３８ｗｔ％ＣａＯ−３８ｗｔ％ＳｉＯ2―２４ｗｔ％
Ａｌ2Ｏ3スラグ中に浸漬して実施した。図２より、Ｃｒ
3Ｃ2は非酸化物であるために配合量が大きくなるにした
がって腐食速度は大きくなるが、腐食量の絶対値自体は
Ｃｒ3Ｃ2配合量には大きく依存せず、熱伝導率を高める
ために耐火物全体の組成物重量に対して６０ｗｔ％を超
える量にしても、腐食速度は耐火物耐食性の目安となる
０．０５ｍｍ／ｈより大幅に小さく良好である。Corrosion tests are conducted by refractory materials at 1300 ° C in the atmosphere.
38 wt% CaO-38 wt% SiO 2 -24 wt%
It was carried out by immersing it in Al 2 O 3 slag. From Figure 2, Cr
Since 3 C 2 is a non-oxide, the corrosion rate increases as the blending amount increases, but the absolute value of the corrosion amount itself does not largely depend on the Cr 3 C 2 blending amount and enhances the thermal conductivity. Therefore, even if the amount exceeds 60 wt% with respect to the total weight of the composition of the refractory, the corrosion rate is significantly smaller than 0.05 mm / h, which is a standard of the refractory corrosion resistance, and it is good.
【００１５】図３は耐火物の腐食速度と腐食試験温度と
の関係を示す図である。腐食試験は、図２の場合と同様
に大気中で耐火物を１３００℃の３８ｗｔ％ＣａＯ−３
８ｗｔ％ＳｉＯ2―２４ｗｔ％Ａｌ2Ｏ3スラグ中に浸漬
して実施した。図３より、単体で耐火物として用いた場
合、８７．３ｗｔ％Ｃｒ2Ｏ3―１０．４ｗｔ％Ａｌ2Ｏ3
―２．３ｗｔ％ＴｉＯ2，Ｃｒ3Ｃ2、ＳｉＣの順で耐食
性が良好となることがわかり、耐火物全体の耐食性を大
きく左右する耐火物マトリックスとしてはＣｒ 2Ｏ3―Ａ
ｌ2Ｏ3―ＴｉＯ2系酸化物が適している。FIG. 3 shows the corrosion rate of the refractory and the corrosion test temperature.
It is a figure which shows the relationship of. Corrosion test is the same as in Fig. 2
Refractory in the air at 1300 ℃ 38wt% CaO-3
8 wt% SiO2-24wt% Al2O3Dipping in slag
It was carried out. From Fig. 3, when used alone as a refractory
87.3 wt% Cr2O3― 10.4wt% Al2O3
-2.3 wt% TiO2, Cr3C2, SiC in order of corrosion resistance
It was found that the corrosion resistance of the entire refractory was increased.
Cr as a refractory matrix that influences 2O3-A
l2O3-TiO2System oxides are suitable.
【００１６】Ｃｒ3Ｃ2耐火物の腐食速度を０．０５ｍｍ
／ｈ以下まで低減し、耐食性を向上させるためには、耐
火物表面温度を１３５０℃程度まで低減する必要がある
が、８７．３ｗｔ％Ｃｒ2Ｏ3―１０．４ｗｔ％Ａｌ2Ｏ3
―２．３ｗｔ％ＴｉＯ2耐火物では、１５００℃まで耐
火物表面温度を高めても耐火物の腐食速度は０．０５ｍ
ｍ／ｈ以下であり、プラズマ灰溶融炉の耐火物として必
要とされている耐食性を十分満足する。The corrosion rate of the Cr 3 C 2 refractory is 0.05 mm.
/ H or less and to improve the corrosion resistance, it is necessary to reduce the refractory surface temperature to about 1350 ° C., but 87.3 wt% Cr 2 O 3 -10.4 wt% Al 2 O 3
-With 2.3wt% TiO 2 refractory, the corrosion rate of refractory is 0.05m even if the refractory surface temperature is raised up to 1500 ℃.
It is m / h or less and sufficiently satisfies the corrosion resistance required as a refractory material for the plasma ash melting furnace.
【００１７】図４は耐火物の表面温度及び熱伝導率とＣ
ｒ3Ｃ2配合量との関係を示す図である。図４より、耐火
物表面温度を１３５０℃以下にするためには、Ｃｒ3Ｃ2
配合量を６０ｗｔ％を超える値にし、耐火物の熱伝導率
を８ｋｃａｌ／ｍ・ｈ・℃以上としておく必要がある。
次に、耐火物の組成として骨材である金属クロム炭化物
のＣｒ3Ｃ2配合量を重量％で７５ｗｔ％、耐火物マトリ
ックスである８７．３ｗｔ％Ｃｒ2Ｏ3―１０．４ｗｔ％
Ａｌ2Ｏ3―２．３ｗｔ％ＴｉＯ2酸化物の配合量が２５
ｗｔ％の耐火物をプラズマ灰溶融炉の出滓口に使用し、
１５００℃の溶融スラグを利用して出滓口よりスラグが
排出されたが、耐食性の問題を生じずに稼動できた。FIG. 4 shows the surface temperature and thermal conductivity of refractory and C
It is a diagram showing a relationship between r 3 C 2 amount. From FIG. 4, in order to keep the refractory surface temperature below 1350 ° C., Cr 3 C 2
It is necessary to set the compounding amount to a value exceeding 60 wt% and to set the thermal conductivity of the refractory material to 8 kcal / m · h · ° C or more.
Next, as the composition of the refractory, the content of Cr 3 C 2 of the metal chromium carbide as the aggregate is 75 wt% by weight, and the refractory matrix is 87.3 wt% Cr 2 O 3 -10.4 wt%.
Al 2 O 3 -2.3 wt% TiO 2 oxide content is 25
Using wt% refractory for the outlet of the plasma ash melting furnace,
The molten slag at 1500 ° C. was used to discharge the slag from the outlet, but it could operate without causing a problem of corrosion resistance.
【００１８】[0018]
【発明の効果】以上説明したように、本発明によれば、
酸化特性が高く、冷却構造がとれ、腐食速度が０．０５
ｍｍ／ｈ以下の耐食性を有する耐火物である。また、プ
ラズマ灰溶融炉の耐火物として必要とされている耐食性
を十分満足するこの耐火物を炉本体の出滓口に使用する
ことにより、プラズマ灰溶融炉の良好な稼動が発揮でき
る。As described above, according to the present invention,
High oxidation property, good cooling structure, corrosion rate of 0.05
It is a refractory having a corrosion resistance of mm / h or less. Further, by using this refractory material that sufficiently satisfies the corrosion resistance required as the refractory material of the plasma ash melting furnace at the outlet of the furnace body, good operation of the plasma ash melting furnace can be exhibited.
【図１】 本発明の耐火物マトリックスを構成するＣｒ
2Ｏ3―Ａｌ2Ｏ3―ＴｉＯ2系酸化物の組成範囲を示す図
である。FIG. 1 Cr constituting the refractory matrix of the present invention
It is a diagram showing the composition range of 2 O 3 -Al 2 O 3 -TiO 2 based oxide.
【図２】 本発明の耐火物のＣｒ3Ｃ2配合量と腐食速度
との関係を示す図である。FIG. 2 is a graph showing the relationship between the Cr 3 C 2 content and the corrosion rate of the refractory material of the present invention.
【図３】 耐火物の腐食速度と腐食試験温度との関係を
示す図である。FIG. 3 is a diagram showing a relationship between a corrosion rate of a refractory and a corrosion test temperature.
【図４】 耐火物の表面温度及び熱伝導率とＣｒ3Ｃ2配
合量との関係を示す図である。FIG. 4 is a diagram showing the relationship between the surface temperature and thermal conductivity of a refractory material and the amount of Cr 3 C 2 compounded.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 野間 彰 神奈川県横浜市金沢区幸浦一丁目８番地１ 三菱重工業株式会社横浜研究所内 (72)発明者 井上 敬太 神奈川県横浜市中区錦町12番地 三菱重工 業株式会社横浜製作所内 Ｆターム(参考） 4G001 BA03 BA12 BA13 BA24 BB03 BB12 BB13 BB24 BC03 BC13 BC46 BC52 BC56 BD07 BD37 4K051 AA00 AB03 BE03 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Akira Noma 1-8 Koura, Kanazawa-ku, Yokohama-shi, Kanagawa Mitsubishi Heavy Industries Yokohama Research Center (72) Inventor Keita Inoue 12 Nishiki-cho, Naka-ku, Yokohama-shi, Kanagawa Mitsubishi Heavy Industries Yokohama Co., Ltd. F-term (reference) 4G001 BA03 BA12 BA13 BA24 BB03 BB12 BB13 BB24 BC03 BC13 BC46 BC52 BC56 BD07 BD37 4K051 AA00 AB03 BE03
Claims (5)
し、Ｃｒ2Ｏ3―Ａｌ2Ｏ3―ＴｉＯ2系酸化物をマトリッ
クスとするＣｒ3Ｃ2―Ｃｒ2Ｏ3―Ａｌ2Ｏ3―ＴｉＯ2系
組成物であることを特徴とする金属クロム炭化物を骨材
とする耐火物。The method according to claim 1] Cr 3 C 2 of metallic chromium carbide and aggregate, Cr 2 O 3 -Al 2 O 3 the -TiO 2 based oxide and the matrix Cr 3 C 2 -Cr 2 O 3 -Al 2 O A refractory material containing a metal chromium carbide as an aggregate, which is a 3- TiO 2 composition.
全体の組成物重量に対し重量％で６０ｗｔ％を超え、９
５ｗｔ％以下であることを特徴とする請求項１に記載の
金属クロム炭化物を骨材とする耐火物。2. The amount of the chromium metal carbide of Cr 3 C 2 exceeds 60 wt% in weight% with respect to the total weight of the composition, and 9
The refractory material containing the metallic chromium carbide as an aggregate according to claim 1, which is 5 wt% or less.
化物が重量％でＣｒ2Ｏ3とＡｌ2Ｏ3の合計に対してＣｒ
2Ｏ3の割合が３９〜１００ｗｔ％、同じくＡｌ2Ｏ3の割
合が０〜６１ｗｔ％、粉末全体に対するＴｉＯ2の割合
が０．２６〜４．４ｗｔ％であることを特徴とする請求
項１または請求項２に記載の金属クロム炭化物を骨材と
する耐火物。3. The Cr 2 O 3 --Al 2 O 3 --TiO 2 type oxide is in a weight% and is Cr based on the total amount of Cr 2 O 3 and Al 2 O 3.
The ratio of 2 O 3 is 39 to 100 wt%, the ratio of Al 2 O 3 is 0 to 61 wt%, and the ratio of TiO 2 to the whole powder is 0.26 to 4.4 wt%. Alternatively, a refractory material containing the metal chromium carbide according to claim 2 as an aggregate.
し、Ｃｒ2Ｏ3―Ａｌ2Ｏ3―ＴｉＯ2系酸化物をマトリッ
クスとするＣｒ3Ｃ2―Ｃｒ2Ｏ3―Ａｌ2Ｏ3―ＴｉＯ2系
組成物の耐火物を炉本体の出滓口の耐火物として使用し
たことを特徴とするプラズマ灰溶融炉。The wherein Cr 3 C 2 of metallic chromium carbide and aggregate, Cr 2 O 3 -Al 2 O 3 the -TiO 2 based oxide and the matrix Cr 3 C 2 -Cr 2 O 3 -Al 2 O A plasma ash melting furnace, wherein a refractory material of a 3- TiO 2 composition is used as a refractory material at the outlet of the furnace body.
全体の組成物重量に対し重量％で６０ｗｔ％を超え、前
記Ｃｒ2Ｏ3―Ａｌ2Ｏ3―ＴｉＯ2系酸化物が重量％でＣ
ｒ2Ｏ3とＡｌ2Ｏ3の合計に対してＣｒ2Ｏ3の割合が３９
〜１００ｗｔ％、同じくＡｌ2Ｏ3の割合が０〜６１ｗｔ
％、粉末全体に対するＴｉＯ2の割合が０．２６〜４．
４ｗｔ％であることを特徴とする請求項４に記載のプラ
ズマ灰溶融炉。5. The amount of the chromium chromium carbide of Cr 3 C 2 is more than 60 wt% based on the total weight of the composition, and the Cr 2 O 3 --Al 2 O 3 --TiO 2 based oxide is present in a weight ratio. % In C
The ratio of Cr 2 O 3 to the total of r 2 O 3 and Al 2 O 3 is 39.
〜100wt%, the proportion of Al 2 O 3 is 0〜61wt%
%, The ratio of TiO 2 to the entire powder is 0.26 to 4.
It is 4 wt%, The plasma ash melting furnace of Claim 4 characterized by the above-mentioned.
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|---|---|---|---|
| JP2002039222A JP2003238251A (en) | 2002-02-15 | 2002-02-15 | Refractory with metal chromium carbide as aggregate and plasma ash fusion furnace using the same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002039222A JP2003238251A (en) | 2002-02-15 | 2002-02-15 | Refractory with metal chromium carbide as aggregate and plasma ash fusion furnace using the same |
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| Publication Number | Publication Date |
|---|---|
| JP2003238251A true JP2003238251A (en) | 2003-08-27 |
Family
ID=27780323
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017136496A1 (en) * | 2016-02-05 | 2017-08-10 | Saint-Gobain Ceramics & Plastics, Inc. | Chromium oxide refractory object and methods of forming thereof |
| CN112341163A (en) * | 2020-11-17 | 2021-02-09 | 武汉科技大学 | Addition of C @ Cr3C2Low-carbon magnesia-carbon refractory material of composite powder and preparation method thereof |
| CN115286401A (en) * | 2022-06-29 | 2022-11-04 | 武汉科技大学 | Cr (chromium) 2 AlC combined silicon carbide refractory material and preparation method thereof |
-
2002
- 2002-02-15 JP JP2002039222A patent/JP2003238251A/en not_active Withdrawn
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017136496A1 (en) * | 2016-02-05 | 2017-08-10 | Saint-Gobain Ceramics & Plastics, Inc. | Chromium oxide refractory object and methods of forming thereof |
| US10336653B2 (en) | 2016-02-05 | 2019-07-02 | Saint-Gobain Ceramics & Plastics, Inc. | Chromium oxide refractory object and methods of forming thereof |
| CN112341163A (en) * | 2020-11-17 | 2021-02-09 | 武汉科技大学 | Addition of C @ Cr3C2Low-carbon magnesia-carbon refractory material of composite powder and preparation method thereof |
| CN115286401A (en) * | 2022-06-29 | 2022-11-04 | 武汉科技大学 | Cr (chromium) 2 AlC combined silicon carbide refractory material and preparation method thereof |
| CN115286401B (en) * | 2022-06-29 | 2023-03-31 | 武汉科技大学 | Cr (chromium) 2 AlC combined silicon carbide refractory material and preparation method thereof |
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