JPH01111437A - Coal ash-treating oven and operation thereof - Google Patents
Coal ash-treating oven and operation thereofInfo
- Publication number
- JPH01111437A JPH01111437A JP26661087A JP26661087A JPH01111437A JP H01111437 A JPH01111437 A JP H01111437A JP 26661087 A JP26661087 A JP 26661087A JP 26661087 A JP26661087 A JP 26661087A JP H01111437 A JPH01111437 A JP H01111437A
- Authority
- JP
- Japan
- Prior art keywords
- furnace
- coal ash
- coal
- tuyere
- oven
- 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 description 11
- 239000010883 coal ash Substances 0.000 claims abstract description 46
- 239000002893 slag Substances 0.000 claims abstract description 18
- 238000007664 blowing Methods 0.000 claims abstract description 13
- 239000000843 powder Substances 0.000 claims abstract description 5
- 239000003575 carbonaceous material Substances 0.000 claims description 14
- 238000002485 combustion reaction Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 3
- 239000007789 gas Substances 0.000 abstract description 24
- 239000000571 coke Substances 0.000 abstract description 5
- 239000011819 refractory material Substances 0.000 abstract description 2
- 239000000203 mixture Substances 0.000 description 6
- 238000002347 injection Methods 0.000 description 5
- 239000007924 injection Substances 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 235000019738 Limestone Nutrition 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000002956 ash Substances 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000006028 limestone Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 229910000805 Pig iron Inorganic materials 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000011400 blast furnace cement Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000010459 dolomite Substances 0.000 description 1
- 229910000514 dolomite Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 238000011017 operating method Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L10/00—Use of additives to fuels or fires for particular purposes
- C10L10/04—Use of additives to fuels or fires for particular purposes for minimising corrosion or incrustation
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
この発明は、石炭灰の処理炉および処理炉の操業方法に
関し、とくに電力業で多量に発生する石炭灰の有利な資
源化を鉄鋼業で実現しようとするものである。[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a coal ash processing furnace and a method of operating the processing furnace, and in particular, the present invention relates to an advantageous resource utilization of coal ash, which is generated in large quantities in the electric power industry, in the steel industry. This is what we are trying to achieve.
（従来の技術）
石炭火力は原子力についで主要な電力源として考えられ
ている。石炭火力では石炭使用量の１５〜２５％が石炭
灰となる。現在では、石炭火力での石炭使用量は年間２
０００万りを越えており、石炭灰は年間約４００万ｔも
発生している。(Conventional Technology) Coal-fired power is considered as the main source of electricity next to nuclear power. In coal-fired power plants, 15-25% of the coal used becomes coal ash. Currently, the amount of coal used in coal-fired power generation is 2.
About 4 million tons of coal ash is produced every year.
（発明が解決しようとする問題点）
石炭火力は今後も増加する見込で、西暦２０００年には
石炭灰は年間１０００万ｔにも達すると予測されるが、
この膨大な灰の処理・処分が重要な課題となっている。(Problem to be solved by the invention) Coal-fired power generation is expected to continue to increase in the future, and coal ash is predicted to reach 10 million tons per year by the year 2000.
Processing and disposal of this huge amount of ash has become an important issue.
というのは現状では、発生する石炭灰のうち、セメント
原料などに積極的に利用されているのは約３０％程度で
あって、残りの約７０％は埋立てなどで処理されている
にすぎないからである。Currently, only about 30% of the coal ash generated is actively used as raw material for cement, and the remaining 70% is disposed of in landfills. That's because there isn't.
この発明は、上記の問題を有利に解決するもので、石炭
灰の用途を拡大して、その効果的な有効利用を図ること
ができる石炭灰の処理炉およびその操業方法を提案する
ことを目的とする。The purpose of the present invention is to propose a coal ash processing furnace and its operating method that can advantageously solve the above problems and can expand the uses of coal ash and make effective use of it. shall be.
（問題点を解決するための手段）
さて、石炭灰の有効利用の拡大のためには、設備費や操
業費が安いこと、石炭灰が多量に利用できることが重要
である。(Means for solving the problem) In order to expand the effective use of coal ash, it is important that equipment costs and operating costs are low and that coal ash can be used in large quantities.
そこで発明者らは、石炭灰の有効利用について種々検討
の結果、該石炭灰を塊成化などの事前処理を行うことな
しに粉状のままで溶融処理してスラグ化し、後述する高
炉スラグと同等の性質を持たせることが所期した目的の
達成に極めて有効であることの知見を得た。Therefore, as a result of various studies on the effective use of coal ash, the inventors melted the coal ash in its powder form and turned it into slag without performing any prior treatment such as agglomeration. We have obtained the knowledge that providing equivalent properties is extremely effective in achieving the intended purpose.
二の発明は、上記の知見に立脚するものである。The second invention is based on the above knowledge.
すなわちこの発明は、炭材の充てん層および／又は流動
層を形成する竪形炉からなり、該竪形炉本体の胴部の下
方には、支燃性ガスを供給する１段又は２段以上の吹込
み羽口とスラグ化した石炭灰を排出する排出口とを形成
し、一方竪形炉本体の上部には、炭材を投入する投入口
、主に炉頂ガスの２次燃焼を司る炉頂羽口および炉内に
て発生したガスを排出する排出口を形成してなる石炭灰
処理炉であり、またこの発明は炭材の充てん層および／
又は流動層を形成する竪形炉からなり、該竪形炉本体の
胴部の下方には、支燃性ガスを供給する１段又は２段以
上の吹込み羽口とスラグ化した石炭灰の排出口を備える
一方、竪形炉本体の上部には、炭材の投入口、炉頂羽口
および炉内発生ガスの排出口を備える石炭灰処理炉にて
、石炭灰を溶融処理してスラグ化するに際し、石炭灰を
上記吹込み羽口および炉頂羽口のうち少なくとも何れか
の羽口から、そのスラグ化に役立つ粉体とともに炉内に
吹込むことを特徴とする石炭灰処理炉の操業方法である
。That is, this invention comprises a vertical furnace forming a packed bed and/or a fluidized bed of carbonaceous material, and below the body of the vertical furnace body there are one or more stages for supplying combustion-supporting gas. It forms an injection tuyere and an outlet for discharging the slagged coal ash, while the upper part of the vertical furnace body has an inlet for introducing carbonaceous materials, and a tuyere for mainly controlling the secondary combustion of the top gas. A coal ash processing furnace is provided with a furnace top tuyere and an exhaust port for discharging gas generated in the furnace.
Or, it consists of a vertical furnace that forms a fluidized bed, and the lower part of the body of the vertical furnace main body has one or more stages of blowing tuyeres that supply combustion-supporting gas and slagified coal ash. A coal ash processing furnace is equipped with a discharge port, and an inlet for carbonaceous materials, a top tuyere, and a discharge port for gas generated in the furnace. A coal ash processing furnace characterized in that the coal ash is blown into the furnace through at least one of the above-mentioned blowing tuyeres and the furnace top tuyeres together with powder that helps in converting the coal ash into slag. This is the method of operation.
ここに石炭灰をスラグ化するに役立つ粉体とは、微粉炭
や粉状のＣａＯ含有物質を意味する。Here, the powder useful for turning coal ash into slag means pulverized coal and powdered CaO-containing substances.
以下にこの発明を具体的に説明する。This invention will be specifically explained below.
高炉スラグは、高炉で溶融された鉄鉱石の鉄以外の成分
が副原料の石炭石やコークス中の灰分と一緒になったも
ので、銑鉄トンあたり約０．３トン生成する。高炉スラ
グには、徐冷スラグと水砕スラグの二種類があり、徐冷
スラグは道路用の路盤材、コンクリート用粗骨材、セメ
ントクリンカ−原料などに使われ、一方水砕スラグは高
炉セメント原料、ポルトランドセメント混合材、コンク
リート混合剤などに利用されている。Blast furnace slag is a mixture of non-iron components of iron ore melted in a blast furnace, together with the auxiliary raw materials coal stone and ash in coke, and is produced about 0.3 tons per ton of pig iron. There are two types of blast furnace slag: air-cooled slag and granulated slag. Air-cooled slag is used as road base material, coarse aggregate for concrete, raw material for cement clinker, etc., while granulated slag is used for blast furnace cement. It is used as a raw material, portland cement mixture, concrete mixture, etc.
そしてかかる高炉スラグの需要は今後ますます増加する
と予想されるので、シリカやアルミナを豊富に含有して
いる石炭灰をスラグ化すれば、石炭灰の資源化と大量処
理が期待できる。Since the demand for such blast furnace slag is expected to increase further in the future, if coal ash containing abundant silica and alumina is turned into slag, it is expected that coal ash will be turned into a resource and processed in large quantities.
さて第１図に、この発明に従う石炭灰処理炉の構成を模
式的に示す。Now, FIG. 1 schematically shows the configuration of a coal ash processing furnace according to the present invention.
同図における番号１は石炭やコークスなどの炭材の充て
ん層および／又は流動層を形成する竪形炉、２及び３は
竪形炉１の胴部の下方に設けた吹込み羽口で、この例で
は炉内を高温状態に維持し短時間で石炭灰を処理できる
ように上下２段設けである。４はスラグ化した石炭灰を
排出する排出口、５は炭材を投入する投入口、６は主に
炉頂ガスの２次燃焼を司る炉頂羽口であり、そして７は
炉内にて発生したガスを排出するガス排出口である。In the figure, number 1 is a vertical furnace that forms a packed bed and/or fluidized bed of carbonaceous materials such as coal or coke, and 2 and 3 are blowing tuyeres provided below the body of the vertical furnace 1. In this example, there are two stages, upper and lower, so that the inside of the furnace can be maintained at a high temperature and the coal ash can be processed in a short time. 4 is a discharge port for discharging slagged coal ash, 5 is an input port for charging carbonaceous material, 6 is a furnace top tuyere that mainly controls the secondary combustion of the furnace top gas, and 7 is a furnace inside the furnace. This is a gas exhaust port that exhausts generated gas.
（作 用）
竪形炉１では、その投入口５から塊状の石炭および／又
はコークスが装入される。一方、排出ロアからは炉内で
生成したガスが連続的に排出される。また吹込み羽口２
および３の何れか一方又は両方からは高温の支燃性ガス
、主に空気が石炭灰、粉状の石炭および粉状ＣａＯ含有
物質（石灰石、ドロマイト、流動層燃焼ボイラーにおけ
る使用済石灰など）とともに吹込まれる。ここでこれら
の吹込み量は、石炭灰の性状とくに化学組成によって調
整される。竪形炉１内で溶融処理されスラグ化した石炭
灰は炉床部に溜り排出口４から連続的又は継続的に排出
される。(Function) In the vertical furnace 1, lumped coal and/or coke is charged through the input port 5. On the other hand, the gas generated in the furnace is continuously discharged from the discharge lower. Also, the blowing tuyere 2
and either or both of 3. hot combustion-supporting gases, mainly air, together with coal ash, powdered coal and powdered CaO-containing materials (limestone, dolomite, spent lime in fluidized bed combustion boilers, etc.) Infused. Here, the amount of these injections is adjusted depending on the properties of the coal ash, especially the chemical composition. Coal ash, which has been melted and turned into slag in the vertical furnace 1, is collected in the hearth and is continuously or continuously discharged from the discharge port 4.
石炭灰の溶融処理に当って竪形炉１内に装入された炭材
が加熱され熱分解（乾留）、ガス化する際、炉の上部に
おけるガス温度が低いととくに石炭から発生するタール
分が未分解のまま排ガス中に含有されガス排出ロアの配
管内に付着し配管が閉塞して操業不能となるトラブルが
起こったり、また、炉内には炭材の流動層および／又は
充てん層が形成されるので、炉頂における排ガス中のＣ
ｏ／Ｃｏ□の値が大きくなり（００％が高＜ＣＯ□％が
低い）、炉内で熱を有効に利用できる比率が低（なって
炭材の原単位が上昇する不利がある。During melting of coal ash, when the carbon material charged in the vertical furnace 1 is heated, thermally decomposed (carbonized), and gasified, if the gas temperature in the upper part of the furnace is low, the tar generated from the coal will be removed. may be contained in the exhaust gas undecomposed and adhere to the piping of the gas exhaust lower, causing problems such as clogging of the piping and rendering it impossible to operate.Furthermore, there may be a fluidized bed and/or a packed bed of carbonaceous material in the furnace. C in the flue gas at the top of the furnace
The value of o/Co□ becomes large (00% is high<CO□% is low), and the ratio of heat that can be used effectively in the furnace is low (this results in a disadvantage that the basic unit of carbon material increases).
これらの問題を避けるためには炉頂ガス温度を所定の温
度（約８００°Ｃ）以上に維持することが有効であり、
そこでこの発明においては、炉頂羽口６から支燃性ガス
を炉内に吹込み炉頂ガスの一部を燃焼させる。なお、炉
頂ガス温度が上がりすぎる場合には、水蒸気又は水を炉
頂に添加することにより対処する。炉頂羽口６はこのよ
うに炉頂ガスの温度、ガス組成（主としてＣｏ／ＣＯ□
）を調整できるのでこれによって排ガス用の配管の閉塞
とか炭材原単位の上昇を回避できる利点がある他、比較
的粒径が大きい場合には、酸素含有気体とともに石炭灰
も吹込むことができる。In order to avoid these problems, it is effective to maintain the furnace top gas temperature above a predetermined temperature (approximately 800°C).
Therefore, in the present invention, combustion-supporting gas is blown into the furnace from the furnace top tuyere 6 and a part of the furnace top gas is combusted. Note that if the furnace top gas temperature rises too much, this can be dealt with by adding steam or water to the furnace top. In this way, the furnace top tuyeres 6 control the temperature and gas composition (mainly Co/CO□) of the furnace top gas.
) can be adjusted, which has the advantage of avoiding clogging of exhaust gas pipes and increasing the carbon material consumption rate.In addition, if the particle size is relatively large, coal ash can be injected together with oxygen-containing gas. .
なお、この発明の処理炉では、炉１内に形成された炭材
の流動層においては良好な燃焼、熱交換が実現され、石
炭灰の溶融処理の際にスラグフォーミングとか耐火物の
損傷などを効果的に防止できる利点がある。In addition, in the processing furnace of the present invention, good combustion and heat exchange are achieved in the fluidized bed of carbonaceous material formed in the furnace 1, and slag forming and damage to refractories are avoided during melting of coal ash. It has the advantage of being able to be effectively prevented.
（実施例）
上掲第１図に示した処理炉（炉内径０．４ｍ 、炉高３
ｍ）を適用して石炭灰の溶融処理を行ったところ次の結
果が得られた。(Example) The processing furnace shown in Fig. 1 above (furnace inner diameter 0.4 m, furnace height 3
When coal ash was melted using method m), the following results were obtained.
なお、操業条件は、
■）送風量：上段羽口２（３本） １１０ Ｎｍ３／ｈ
ｒ。The operating conditions are as follows: ■) Air flow rate: Upper tuyere 2 (3 pieces) 110 Nm3/h
r.
下段羽口３（３本） １１０ Ｎｍ３／ｈｒ。Lower tuyere 3 (3 pieces) 110 Nm3/hr.
炉頂羽口６（２本） ６０ Ｎｍ３／ｈｒ。Furnace top tuyeres 6 (2 pieces) 60 Nm3/hr.
２）石炭灰吹込量： ３１０ ｋｇ／ｈｒ上段羽口 ２
７０ ｋｇ／ｈｒ 下段羽口４０ ｋｇ／ｈｒ３）微
粉炭吹込量： ７０ ｋｇ／ｈｒ上段羽口 ４００ ｋ
ｇ／ｈｒ 下段羽口３０ ｋｇ／ｈｒ４）石灰石吹込
量： ２８０ ｋｇ／ｈｒ上段羽口 ２２０ ｋｇ／ｈ
ｒ 下段羽口６０ ｋｇ／ｈｒ５） コークスの装入
量： ２５ ｋｇ／ｈｒとした。2) Coal ash injection amount: 310 kg/hr Upper tuyere 2
70 kg/hr Lower tuyere 40 kg/hr3) Pulverized coal injection amount: 70 kg/hr Upper tuyere 400 k
g/hr Lower tuyere 30 kg/hr4) Limestone injection amount: 280 kg/hr Upper tuyere 220 kg/hr
r lower tuyere 60 kg/hr5) Coke charge: 25 kg/hr.
スラグの生成量は４１０ｋｇ／ｈｒであり、その組成は ＳｉＯ□ ： ３８．８％ Ａｌ ２０３ ： １５．５％ ＣａＯ：３９．１％ ＭｇＯ： ３．２％ であった。The amount of slag produced is 410 kg/hr, and its composition is SiO□: 38.8% Al 203: 15.5% CaO: 39.1% MgO: 3.2% Met.
（発明の効果）
かくしてこの発明によれば、石炭灰を操業コストの上昇
を伴なうことなしに多量に処理することが可能になり、
石炭灰を資源化して有効に利用することができる。(Effects of the invention) Thus, according to the invention, it is possible to process coal ash in large quantities without increasing operating costs.
Coal ash can be turned into a resource and used effectively.
第１図は、この発明に従う処理炉の構成説明図である。
１・・・竪形炉 ２・・・吹込み羽口３・・
・吹込み羽口 ４・・・排出口５・・・投入口
６・・・炉頂羽ロア・・・ガス排出口
特許出願人 川崎製鉄株式会社
第１図
４ズウワ羽トムロ
手続補正書
昭和６２年１２月１７日FIG. 1 is an explanatory diagram of the configuration of a processing furnace according to the present invention. 1...Vertical furnace 2...Blowing tuyere 3...
・Blowing tuyere 4...Discharge port 5...Inlet port
6...Furnace top vane lower...Gas discharge port Patent applicant Kawasaki Steel Corporation Figure 1 4 Zuwa van Tomuro procedural amendment December 17, 1988
Claims (1)
炉からなり、該竪形炉本体の胴部の下方には、支燃性ガ
スを供給する１段又は２段以上の吹込み羽口とスラグ化
した石炭灰を排出する排出口とを形成し、一方竪形炉本
体の上部には、炭材を投入する投入口、主に炉頂ガスの
２次燃焼を司る炉頂羽口および炉内にて発生したガスを
排出する排出口を形成してなる石炭灰処理炉。 ２、炭材の充てん層および／又は流動層を形成する竪形
炉からなり、該竪形炉本体の胴部の下方には、支燃性ガ
スを供給する１段又は２段以上の吹込み羽口とスラグ化
した石炭灰の排出口を備える一方、竪形炉本体の上部に
は、炭材の投入口、炉頂羽口および炉内発生ガスの排出
口を備える石炭灰処理炉にて、石炭灰を溶融処理してス
ラグ化するに際し、石炭灰を上記吹込み羽口および炉頂
羽口のうち少なくとも何れかの羽口から、そのスラグ化
に役立つ粉体とともに炉内に吹込むことを特徴とする石
炭灰処理炉の操業方法。[Claims] 1. It consists of a vertical furnace forming a packed bed and/or a fluidized bed of carbonaceous material, and below the body of the vertical furnace body there is a stage or Two or more stages of blowing tuyeres and an outlet for discharging slagged coal ash are formed, while an inlet for introducing carbonaceous material is provided at the top of the vertical furnace body, and an inlet for introducing carbonaceous material, mainly a secondary tuyere for the top gas. A coal ash processing furnace that has a top tuyere that controls combustion and an exhaust port that discharges gas generated within the furnace. 2. It consists of a vertical furnace that forms a packed bed and/or a fluidized bed of carbonaceous material, and below the body of the vertical furnace body there is one or more stages of blowing for supplying combustion-supporting gas. A coal ash processing furnace is equipped with a tuyere and an outlet for slagged coal ash, while the upper part of the vertical furnace body is equipped with a coal material inlet, a top tuyere, and an outlet for gas generated in the furnace. , when coal ash is melted and turned into slag, the coal ash is blown into the furnace through at least one of the above-mentioned blowing tuyeres and the furnace top tuyeres together with powder that helps in turning it into slag; A method of operating a coal ash processing furnace characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26661087A JPH01111437A (en) | 1987-10-23 | 1987-10-23 | Coal ash-treating oven and operation thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26661087A JPH01111437A (en) | 1987-10-23 | 1987-10-23 | Coal ash-treating oven and operation thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01111437A true JPH01111437A (en) | 1989-04-28 |
| JPH0422614B2 JPH0422614B2 (en) | 1992-04-20 |
Family
ID=17433208
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26661087A Granted JPH01111437A (en) | 1987-10-23 | 1987-10-23 | Coal ash-treating oven and operation thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01111437A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100434151B1 (en) * | 2002-03-21 | 2004-06-04 | 엘지산전 주식회사 | Apparatus for connecting plug in cradle type circuit breaker |
| KR100563370B1 (en) * | 2000-11-02 | 2006-03-22 | 현대중공업 주식회사 | Screw driver apparatus of MCC unit |
-
1987
- 1987-10-23 JP JP26661087A patent/JPH01111437A/en active Granted
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100563370B1 (en) * | 2000-11-02 | 2006-03-22 | 현대중공업 주식회사 | Screw driver apparatus of MCC unit |
| KR100434151B1 (en) * | 2002-03-21 | 2004-06-04 | 엘지산전 주식회사 | Apparatus for connecting plug in cradle type circuit breaker |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0422614B2 (en) | 1992-04-20 |
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