JPS63129216A - Incinerator - Google Patents
IncineratorInfo
- Publication number
- JPS63129216A JPS63129216A JP27479786A JP27479786A JPS63129216A JP S63129216 A JPS63129216 A JP S63129216A JP 27479786 A JP27479786 A JP 27479786A JP 27479786 A JP27479786 A JP 27479786A JP S63129216 A JPS63129216 A JP S63129216A
- Authority
- JP
- Japan
- Prior art keywords
- heat
- heat receiving
- receiving section
- heat exchanger
- air
- 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.)
- Pending
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 33
- 239000012153 distilled water Substances 0.000 claims abstract description 14
- 239000007788 liquid Substances 0.000 claims description 20
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 238000000926 separation method Methods 0.000 claims description 5
- 230000015572 biosynthetic process Effects 0.000 claims description 4
- 238000010992 reflux Methods 0.000 claims description 4
- 238000012546 transfer Methods 0.000 abstract description 4
- 238000010521 absorption reaction Methods 0.000 abstract description 3
- 238000001704 evaporation Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 abstract description 3
- 238000005260 corrosion Methods 0.000 abstract description 2
- 230000007797 corrosion Effects 0.000 abstract description 2
- 239000000463 material Substances 0.000 abstract description 2
- 229910001220 stainless steel Inorganic materials 0.000 abstract description 2
- 239000010935 stainless steel Substances 0.000 abstract description 2
- 238000009423 ventilation Methods 0.000 abstract description 2
- 238000002347 injection Methods 0.000 abstract 3
- 239000007924 injection Substances 0.000 abstract 3
- 239000002699 waste material Substances 0.000 description 7
- 238000004821 distillation Methods 0.000 description 6
- 239000007789 gas Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 239000000567 combustion gas Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000002440 industrial waste Substances 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 239000010813 municipal solid waste Substances 0.000 description 2
- 229920006328 Styrofoam Polymers 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000011491 glass wool Substances 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 239000013212 metal-organic material Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 150000004760 silicates Chemical class 0.000 description 1
- 239000008261 styrofoam Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
Landscapes
- Incineration Of Waste (AREA)
Abstract
Description
【発明の詳細な説明】
〈産業上の利用分野〉
本発明は、都市ゴミや産業廃棄物などの焼却炉に関し、
特に、焼却時における火炎からの熱の直接的な回収を可
能とする焼却炉に関する。[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to an incinerator for municipal waste, industrial waste, etc.
In particular, the present invention relates to an incinerator that allows direct recovery of heat from flame during incineration.
〈従来の技術〉
従来の焼却炉における余熱利用は、焼却炉から高温排ガ
スを廃熱ボイラで回収したり（特公昭６０−３７３６３
号、特開昭６０−１６２１１５号公報等参照）、または
、焼却炉の周壁に水流路等を配して温水の形態で回収し
たりしていた（特開昭６０−１０５８１６号公報等参照
）。<Conventional technology> Conventional methods for utilizing residual heat in incinerators include recovering high-temperature exhaust gas from the incinerator using a waste heat boiler (Japanese Patent Publication No. 60-37363).
(Refer to Japanese Patent Application Laid-open No. 162115/1986, etc.), or by disposing water channels on the peripheral wall of the incinerator and recovering the water in the form of hot water (Refer to Japanese Patent Application Laid-open No. 105816/1981, etc.) .
〈発明が解決しようとする問題点〉
ところが、焼却炉の炉内の火炎からの直接的に熱ｉ回収
する方法は、本発明者の調査した範囲内ではない。<Problems to be Solved by the Invention> However, a method for directly recovering heat i from the flame within the incinerator is not within the scope of research conducted by the present inventors.
その理由は、上記産業廃棄物（廃油を含む）や都市ゴミ
を燃焼させるとＨＣｆ、ＳＯｘ 、ＮＯｘなどの腐食性
ガスが発生するため、炉内の火炎から直接的に熱を回収
しようとして、ステンレス管などからなる熱交換器の受
熱部を炉内に露出させて配した場合、受熱部が鮒わめて
短期間で腐食してしまい実用に耐えないことによる。The reason for this is that corrosive gases such as HCf, SOx, and NOx are generated when the industrial waste (including waste oil) and municipal garbage mentioned above are burned. This is because if the heat receiving part of a heat exchanger made of tubes or the like is placed exposed inside the furnace, the heat receiving part will corrode in a very short period of time, making it impractical.
く問題点を解決するための手段〉
本発明者は、上記にかんがみて、焼却時の火炎から熱を
直接回収できないか、鋭意開発に努力をした結果、下記
構成の焼却炉に想到し得た６熱交換器及びエア供給部材
が具備された焼却炉に島いて、熱交換器の受熱部が炉内
に露出して配されるとともに、エア供給部材のエア噴出
口が受熱部を覆うエアカーテンを形成可能な形状とされ
、かつそれが可能な位置に配されていることを特徴とす
る。Means for Solving the Problems> In view of the above, the present inventor made extensive efforts to develop the possibility of directly recovering heat from the flame during incineration, and as a result, was able to come up with an incinerator with the following configuration. 6. An air curtain installed in an incinerator equipped with a heat exchanger and an air supply member, in which the heat receiving part of the heat exchanger is exposed in the furnace, and the air outlet of the air supply member covers the heat receiving part. It is characterized in that it has a shape that allows it to be formed and is placed in a position that allows it.
〈実施例〉
以下、本発明をよりよく理解するために、実施例を図例
に基づいて説明する。<Example> Hereinafter, in order to better understand the present invention, an example will be described based on illustrated examples.
ここでは、焼却炉として廃油用のものを例に′採ったが
、都市ゴミ用など、火炎を発生させて焼却を行なうタイ
プなら本発明は適用可能である。Here, an incinerator for waste oil was used as an example, but the present invention is applicable to any type of incinerator that generates flame to incinerate, such as for municipal garbage.
第１図に示すように、焼却炉１は廃油を露化させて噴出
させるロータリバーナ３が周壁１ａに、エア供給部材（
二次空気供給部材）５及び熱交換器７が天井壁１ｂにそ
れぞれ装着されている。As shown in FIG. 1, the incinerator 1 has a rotary burner 3 that exposes waste oil and spouts it out, and an air supply member (
A secondary air supply member) 5 and a heat exchanger 7 are respectively attached to the ceiling wall 1b.
熱交換器７は、管状体で受熱部７ａがコイル状とされか
つ炉内に露出して配されている。ここで管状体の材料は
、耐食性、耐熱性を有しかつ熱伝達係数の大ぎなものな
ら、金属材料、無機材料特に限定されないが、通常、バ
ランスのとれた性能を示し、コスト的にも余り高くない
ステンレスが望ましい。ざらに受熱部７ａには黒体化処
理をして、輻射熱の吸収性を向上させておくことが望ま
しい。The heat exchanger 7 is a tubular body with a coil-shaped heat receiving portion 7a, and is disposed so as to be exposed in the furnace. Here, the material for the tubular body is not particularly limited to metal or inorganic materials as long as they have corrosion resistance, heat resistance, and a large heat transfer coefficient, but they usually exhibit well-balanced performance and are inexpensive. Stainless steel is preferable because it is not expensive. It is preferable that the heat receiving portion 7a be subjected to a black body treatment to improve the absorption of radiant heat.
エア供給部材５は、強制通風可能にニアコンプレッサ９
と連結されている。そして、エア供給部材のエア噴出口
６の形状は噴出側大径の円錐台筒状とされ、熱交換器の
受熱部７ａを覆うエアカーテン１１を形成可能となって
いる。このとぎ、エア噴出口５ａの形状及びその配設位
置は、熱交換器の受熱部を覆うエアカーテンを形成可能
ならば、特に限定されず、例えば、受熱部７ａを第１図
の二点鎖線で示す如く、バーナ３と対向する炉側壁に配
した場合、エア噴出口５ａは二点鎖線で示す位置にスリ
ット状の形状とされる。The air supply member 5 is connected to a near compressor 9 for forced ventilation.
is connected to. The shape of the air outlet 6 of the air supply member is a truncated conical tube with a large diameter on the outlet side, so that an air curtain 11 can be formed to cover the heat receiving portion 7a of the heat exchanger. At this point, the shape and position of the air outlet 5a are not particularly limited as long as they can form an air curtain that covers the heat receiving part of the heat exchanger. As shown in , when placed on the furnace side wall facing the burner 3, the air outlet 5a has a slit-like shape at the position indicated by the two-dot chain line.
そして、熱交換器の使用態様は特に限定されないがこの
実施例では熱交換器の受熱部７ａが蒸溜水製造装置の蒸
発部として使用される。即ち、管状体である熱交換器７
の一端が水蒸気管１２を介し気液分離器（断熱材で保温
されている）１３の気液分離部１３ａに、他端が還流管
１４を介して同じく還流部１３ｂに接続され、受熱部７
ａが蒸発部となるように構成されている。さらに、気液
分離器１３の還流部１３ｂには、原料水供給タンク１５
中間に水〜供給弁１６を備えた連通管１７を介して接続
されるとともに、先端に排水弁１８を備えた排水管１９
が接続されている。上記原料水供給タンク１５は、ボー
ルタップ（図示せず）などにより、液面高さが一定にな
るようになっている。また、気液分離部１３ａの留出側
には、中間に凝縮器２２を備えた溜出管２３が接続され
ている。モして溜出管２３の先端は、蒸溜水タンク２５
に接続されている。また、留出管２３は凝縮器２２も含
めて傾斜して（傾斜角度１５°〜４５’）形成されてい
る。Although the manner in which the heat exchanger is used is not particularly limited, in this embodiment, the heat receiving section 7a of the heat exchanger is used as the evaporating section of the distilled water production apparatus. That is, the heat exchanger 7 which is a tubular body
One end is connected to the gas-liquid separator 13a of the gas-liquid separator (heated with a heat insulating material) 13 via the steam pipe 12, and the other end is connected to the reflux section 13b via the reflux pipe 14.
The structure is such that a is an evaporation section. Furthermore, a raw water supply tank 15 is provided in the reflux section 13b of the gas-liquid separator 13.
A drain pipe 19 is connected via a communication pipe 17 with a water supply valve 16 in the middle and has a drain valve 18 at its tip.
is connected. The raw water supply tank 15 is configured to have a constant liquid level using a ball tap (not shown) or the like. Further, a distillation pipe 23 having a condenser 22 in the middle is connected to the distillation side of the gas-liquid separation section 13a. The tip of the distillation pipe 23 is connected to the distilled water tank 25.
It is connected to the. Further, the distillation pipe 23 including the condenser 22 is formed to be inclined (inclination angle of 15° to 45').
上記気液分離器の形状は、特に限定されないが、本発明
者が検討した結果、第２図に示すような下方小径のラン
プ形状のものが、良好な気液分離効果を示すことがわか
った。また、この気液分離器の保温は、発泡スチロール
、グラスウールなどの保温材又はデユワ−びん構造を用
いて行なう。The shape of the gas-liquid separator is not particularly limited, but as a result of study by the present inventor, it was found that a lamp-shaped device with a small downward diameter as shown in FIG. 2 exhibits a good gas-liquid separation effect. . The gas-liquid separator is kept warm using a heat insulating material such as styrofoam or glass wool, or a dewar bottle structure.
次に、上記実施例の蒸溜装置が接続された焼却炉を用い
て蒸溜水を製造する方法を説明をする。Next, a method for producing distilled water using an incinerator connected to the distillation apparatus of the above embodiment will be explained.
原料水は、水道水をそのまま用いていもよいが、通常Ｃ
ｊ！−，Ｆ−が多量に含まれているため、活性炭である
程度除去しておくことが望ましい。Tap water may be used as raw material water, but usually C.
j! Since it contains a large amount of -, F-, it is desirable to remove it to some extent with activated carbon.
水供給弁１６を開とし、気液分離器１３内に所定量の原
料水が供給されるとともに、熱交換器７の受熱部７ａに
も流入する。この状態で、ロータリバーナ３に、廃油タ
ンク２７からポンプ２８を介して廃油を供給し、着火さ
せて燃焼させる。このとき、コンプレッサ９が稼動して
おり、受熱部７ａはエアカーテン１１−により覆われて
いる。このため、燃焼ガス中に既述の如く腐食性ガスが
含まれていても、腐食性ガスはエアカーテン１１により
さえぎられて、受熱部７ａを攻撃しない。しかし、エア
カーテン１１は、主として、伝導・対流による熱移動を
さえぎるのみで、輻射による熱移動をさえぎらない。従
って、受熱部７ａは火炎からの輻射熱を十分に受け、水
が気化されて水蒸気となる。またこのエアカーテン１１
の存在により、受熱部７ａの雰囲気温度が略３００℃以
下に押えることかでき、水蒸気管１２内における激しい
空沸（気液分離効果を低減させる）を抑えることができ
る。The water supply valve 16 is opened, and a predetermined amount of raw water is supplied into the gas-liquid separator 13 and also flows into the heat receiving section 7a of the heat exchanger 7. In this state, waste oil is supplied to the rotary burner 3 from the waste oil tank 27 via the pump 28, and is ignited and burned. At this time, the compressor 9 is operating, and the heat receiving section 7a is covered by the air curtain 11-. Therefore, even if the combustion gas contains corrosive gas as described above, the corrosive gas is blocked by the air curtain 11 and does not attack the heat receiving portion 7a. However, the air curtain 11 mainly only blocks heat transfer due to conduction and convection, but does not block heat transfer due to radiation. Therefore, the heat receiving portion 7a receives sufficient radiant heat from the flame, and the water is vaporized and becomes water vapor. Also, this air curtain 11
Due to the presence of the heat receiving part 7a, the atmospheric temperature of the heat receiving part 7a can be suppressed to approximately 300° C. or less, and severe air boiling (reducing the gas-liquid separation effect) in the steam pipe 12 can be suppressed.
水蒸気は対流現象により水蒸気管１２内を上昇して気液
分離器の気液分離部１３ａに流入する。The water vapor rises in the water vapor pipe 12 due to a convection phenomenon and flows into the gas-liquid separator 13a of the gas-liquid separator.
水蒸気中には空沸現象による飛沫（水滴）を含むととも
に、気液分離部１３ａにおける温度低下に伴ない液滴が
発生するが、飛沫及び液滴は、気液分離部１３ａで分離
され還流部１３ｂに自重により落下する。そして、水蒸
気のみが留出側から、凝縮器２２を備えた漏出管２３に
流入し、凝縮器２２により液化され、蒸溜水タンク２５
に貯えられる。このとき、凝縮器２２を含めて漏出管２
３は傾斜しているため、凝縮により発生した蒸溜水は自
重により蒸溜水タンク２５内に落下する。The water vapor contains droplets (water droplets) due to the air boiling phenomenon, and droplets are generated as the temperature decreases in the gas-liquid separation section 13a. 13b due to its own weight. Then, only water vapor flows from the distillation side into a leakage pipe 23 equipped with a condenser 22, is liquefied by the condenser 22, and is stored in a distilled water tank 25.
can be stored in At this time, the leakage pipe 2 including the condenser 22
3 is inclined, so that the distilled water generated by condensation falls into the distilled water tank 25 due to its own weight.
なお、焼却炉１の運転が終了したら、その度に、水供給
弁１６を閉とした後、排水弁１８を開とし、気液分離器
１３内の原料水を４１１出しておくことが、蒸溜器内に
おける無機物（ケイ酸塩等）の沈着の発生を防止でき望
ましい。Note that each time the operation of the incinerator 1 is finished, the water supply valve 16 is closed, and then the drain valve 18 is opened to drain out the raw water in the gas-liquid separator 13. This is desirable because it can prevent the deposition of inorganic substances (silicates, etc.) inside the vessel.
〈発明の作用・効果〉
本発明の焼却炉は、上記の如く、熱交換器の受熱部が炉
内に露出して配されているとともに、エア供給部材のエ
ア噴出ノズルが受熱部を覆うエアカーテンを形成可能な
形状とされ、かつそれが可能な位置に配されている構成
により下記のような作用・効果を奏する。<Operations and Effects of the Invention> As described above, in the incinerator of the present invention, the heat receiving part of the heat exchanger is arranged to be exposed in the furnace, and the air jetting nozzle of the air supply member is arranged to expose the heat receiving part to the incinerator. The following functions and effects can be achieved by having a shape that allows the formation of a curtain and arranging it in a position that allows the formation of a curtain.
熱交換器の受熱部は、エアカーテンに覆われているので
、焼却炉を運転したとき発生する燃焼ガス中に、腐食性
ガスが含まれていても、腐食性ガスの攻撃をほとんど受
けない。従って、熱交換器の受熱部が短期間に腐食する
ことなく、焼却炉の火炎から直接的に熱を回収すること
が可能となる（ｂ）熱交換器の受熱部を蒸溜水製造装置
の蒸発部として利用した場合、エアカーテンの存在によ
り、受熱部の熱吸収の態様がマイルドとなり、激しい突
沸の発生を抑えることができ、蒸溜水製造装置の好適な
熱源とすることができる。Since the heat receiving part of the heat exchanger is covered with an air curtain, even if corrosive gas is contained in the combustion gas generated when the incinerator is operated, it is hardly attacked by the corrosive gas. Therefore, it is possible to directly recover heat from the flame of the incinerator without the heat receiving part of the heat exchanger corroding in a short period of time. When used as a heat receiving section, the presence of the air curtain makes the heat absorption mode of the heat receiving section mild, suppressing the occurrence of severe bumping, and making it a suitable heat source for distilled water production equipment.
ちなみに、上記実施例の蒸溜水製造装置において、下記
仕様で蒸溜水を製造し、各イオン濃度の分析を行なった
ところ、第１表に示す結果となった。その結果は第１表
に、対比のために行なった市販の高純１蒸溜水について
の分析結果を凌駕している。Incidentally, in the distilled water production apparatus of the above example, distilled water was produced according to the following specifications and the concentration of each ion was analyzed, resulting in the results shown in Table 1. The results are shown in Table 1, and are superior to the analysis results for commercially available high purity 1 distilled water, which was conducted for comparison.
（仕様）
廃油供給速度・・・２０ ｊ２／ｈ
炉内残存酸素量・・・８％
熱交換器使用バイブ・・・１０ｍｍφ、１ａ＋ｍｔ、受
熱部・・・４＠１巻径１０（ｌｓｍ、気液分離器・・・
容積１０１（水相４ＩＬ）受熱部からの気液分離器水頭
・・・６０ｃｍ第 １ 表(Specifications) Waste oil supply rate...20 j2/h Amount of oxygen remaining in the furnace...8% Vibrator used in heat exchanger...10mmφ, 1a+mt, heat receiving part...4@1 roll diameter 10 (lsm, air Liquid separator...
Volume 101 (water phase 4IL) Gas-liquid separator water head from heat receiving section...60cm Table 1
第１図は本発明の焼却炉を蒸溜水製造装置を結合させた
概略システム図、第２図は蒸溜水製造装置の気液分離器
の一態様図である。
１・・・焼却炉、
５・・・エア供給部材、
５ａ・・・エア噴出口、
７・・・熱交換器、
７ａ・・・受熱部、
１１・・・エアカーテン、
１３・・・気液分離器、
２２・・・凝縮器。
特 許 出 願 人
浅 井 勝 −
代 理 人FIG. 1 is a schematic system diagram in which the incinerator of the present invention is combined with a distilled water production device, and FIG. 2 is a diagram of one embodiment of a gas-liquid separator of the distilled water production device. DESCRIPTION OF SYMBOLS 1... Incinerator, 5... Air supply member, 5a... Air outlet, 7... Heat exchanger, 7a... Heat receiving part, 11... Air curtain, 13... Air Liquid separator, 22... condenser. Patent applicant Masaru Asai - Agent
Claims (2)
おいて、 前記熱交換器の受熱部が炉内に露出して配されていると
ともに、前記エア供給部材のエア噴出ノズルが前記受熱
部を覆うエアカーテンを形成可能な形状とされ、かつそ
れが可能な位置に配されている ことを特徴とする焼却炉。(1) In an incinerator equipped with a heat exchanger and an air supply member, the heat receiving part of the heat exchanger is exposed in the furnace, and the air jet nozzle of the air supply member is arranged in the heat receiving part. An incinerator characterized by having a shape that allows the formation of an air curtain that covers the incinerator, and being arranged at a position that allows the formation of an air curtain.
端、及び他端が蒸溜水製造装置における気液分離器の気
液分離部及び還流部とそれぞれ接続されていることを特
徴とする特許請求の範囲第１項記載の焼却炉。(2) One end and the other end of a tubular body continuous with the heat receiving part of the heat exchanger are connected to a gas-liquid separation part and a reflux part of a gas-liquid separator in a distilled water production apparatus, respectively. An incinerator according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27479786A JPS63129216A (en) | 1986-11-18 | 1986-11-18 | Incinerator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27479786A JPS63129216A (en) | 1986-11-18 | 1986-11-18 | Incinerator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63129216A true JPS63129216A (en) | 1988-06-01 |
Family
ID=17546699
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27479786A Pending JPS63129216A (en) | 1986-11-18 | 1986-11-18 | Incinerator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63129216A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4941240U (en) * | 1972-07-17 | 1974-04-11 | ||
| JPS6131893A (en) * | 1984-07-25 | 1986-02-14 | Ebara Corp | Heat retrieving device in fluidized bed incinerating furnace |
| JPS6126743U (en) * | 1984-07-21 | 1986-02-18 | アサヒ住宅株式会社 | Formwork for forming columns in column-based building foundations |
-
1986
- 1986-11-18 JP JP27479786A patent/JPS63129216A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4941240U (en) * | 1972-07-17 | 1974-04-11 | ||
| JPS6126743U (en) * | 1984-07-21 | 1986-02-18 | アサヒ住宅株式会社 | Formwork for forming columns in column-based building foundations |
| JPS6131893A (en) * | 1984-07-25 | 1986-02-14 | Ebara Corp | Heat retrieving device in fluidized bed incinerating furnace |
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