JPH08219437A - Exhaust gas duct and treating method of high-temperature exhaust gas - Google Patents
Exhaust gas duct and treating method of high-temperature exhaust gasInfo
- Publication number
- JPH08219437A JPH08219437A JP7026495A JP2649595A JPH08219437A JP H08219437 A JPH08219437 A JP H08219437A JP 7026495 A JP7026495 A JP 7026495A JP 2649595 A JP2649595 A JP 2649595A JP H08219437 A JPH08219437 A JP H08219437A
- Authority
- JP
- Japan
- Prior art keywords
- exhaust gas
- duct
- gas
- air
- temperature
- 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.)
- Withdrawn
Links
- 238000000034 method Methods 0.000 title claims abstract description 13
- 239000007789 gas Substances 0.000 claims abstract description 138
- 239000011261 inert gas Substances 0.000 claims abstract description 22
- 239000000428 dust Substances 0.000 claims abstract description 16
- 239000000919 ceramic Substances 0.000 claims description 7
- 238000002485 combustion reaction Methods 0.000 abstract description 5
- 239000007791 liquid phase Substances 0.000 abstract description 4
- 238000003466 welding Methods 0.000 abstract description 2
- 238000005192 partition Methods 0.000 abstract 6
- 238000004519 manufacturing process Methods 0.000 abstract 2
- 230000004927 fusion Effects 0.000 abstract 1
- 238000001816 cooling Methods 0.000 description 8
- 238000002844 melting Methods 0.000 description 8
- 230000008018 melting Effects 0.000 description 8
- 239000000126 substance Substances 0.000 description 4
- 101100259716 Arabidopsis thaliana TAA1 gene Proteins 0.000 description 3
- 101100206899 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) TIR2 gene Proteins 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 239000000112 cooling gas Substances 0.000 description 2
- 229910052878 cordierite Inorganic materials 0.000 description 2
- JSKIRARMQDRGJZ-UHFFFAOYSA-N dimagnesium dioxido-bis[(1-oxido-3-oxo-2,4,6,8,9-pentaoxa-1,3-disila-5,7-dialuminabicyclo[3.3.1]nonan-7-yl)oxy]silane Chemical compound [Mg++].[Mg++].[O-][Si]([O-])(O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2)O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2 JSKIRARMQDRGJZ-UHFFFAOYSA-N 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000010926 purge Methods 0.000 description 2
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000001784 detoxification Methods 0.000 description 1
- 238000011038 discontinuous diafiltration by volume reduction Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Landscapes
- Chimneys And Flues (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は焼却灰の資源化処理など
に適用されるプラズマ加熱炉などから出るＣＯやダスト
を含有する高温の排ガスの処理に適した排ガスダクト及
びそれを用いた高温の排ガス処理方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust gas duct suitable for treating high temperature exhaust gas containing CO and dust emitted from a plasma heating furnace applied to the treatment of incinerated ash as a resource, and a high temperature exhaust gas duct using the same. Exhaust gas treatment method
【０００２】[0002]
【従来の技術】最近、焼却灰の減容・無害化処理法とし
て高温処理による溶融固化法が採用されつつあるが、焼
却灰中に含まれる低融点物質がガス状で揮散し、冷却さ
れて炉出口ダクトへ固着したり、飛散ダクトが炉出口ダ
クトへ付着堆積したりするなどによる炉出口ダクト閉塞
トラブルが発生し、連続運転が不能となったり、ＣＯが
排出されるなど、高温の排ガスの処理方法がこの種の高
温プラントのネックとなっている。2. Description of the Related Art Recently, a melting and solidification method by high temperature treatment is being adopted as a volume reduction / detoxification treatment method for incinerated ash, but low melting point substances contained in the incinerated ash are vaporized in a gaseous state and cooled. The trouble of closing the furnace outlet duct due to the sticking to the furnace outlet duct or the adhesion and deposition of the scattering duct on the furnace outlet duct will cause continuous operation to become impossible and CO will be discharged. The treatment method is the bottleneck in this type of high temperature plant.
【０００３】このような問題点を解決した高温排ガスの
処理技術として図５に示す排ガスダクトが提案されてい
る（特開平３−２８８５８４号公報）。図５は排ガスダ
クトの縦断面図、図６（ａ）は図５のＡ−Ａ矢視図、図
６（ｂ）は図５のＢ−Ｂ矢視図である。図５、図６にお
いて、１はダクト（ケーシング）、２は発泡セラミック
などの通気可能な耐熱性多孔体、３は風室、４は空気な
どの気体供給ノズル、５は多孔体押えフランジ、６は多
孔体固定用金具、７は入口排ガス、８は出口排ガス、９
は空気などの気体である。この排ガスダクトにおいて気
体９は気体供給ノズル４から風室３に送り込まれ、多孔
体２からダクト１の内部に噴射されることによって、低
沸点物質や飛散ダストをパージするので、ダクトの閉塞
が防止できる。冷却・パージ用として空気を供給するこ
とにより、未燃ガス（ＣＯなど）の燃焼促進も可能とな
る。しかしながら、高温の排ガスに空気を供給した場
合、今度はいわゆるサーマルＮＯｘの発生という問題生
じる。この問題はとくにＮ2プラズマ溶融炉などから出
るＮ2 高温排ガスの場合に顕著である。An exhaust gas duct shown in FIG. 5 has been proposed as a technique for treating high temperature exhaust gas which solves such problems (Japanese Patent Laid-Open No. 3-288584). 5 is a vertical sectional view of the exhaust gas duct, FIG. 6A is a view taken along the line AA of FIG. 5, and FIG. 6B is a view taken along the line BB of FIG. In FIGS. 5 and 6, 1 is a duct (casing), 2 is a heat-resistant porous body such as foamed ceramic that can be ventilated, 3 is a wind chamber, 4 is a gas supply nozzle such as air, 5 is a porous body holding flange, 6 Is a metal fitting for fixing the porous body, 7 is an inlet exhaust gas, 8 is an outlet exhaust gas, 9
Is a gas such as air. In this exhaust gas duct, the gas 9 is sent from the gas supply nozzle 4 into the wind chamber 3 and is injected from the porous body 2 into the duct 1 to purge low-boiling substances and scattered dust, thus preventing clogging of the duct. it can. By supplying air for cooling / purging, combustion of unburned gas (CO or the like) can be promoted. However, when air is supplied to the high-temperature exhaust gas, a problem of so-called thermal NOx is generated. This problem is particularly remarkable in the case of N 2 high temperature exhaust gas emitted from an N 2 plasma melting furnace or the like.
【０００４】[0004]
【発明が解決しようとする課題】本発明は上記技術水準
に鑑み、ＣＯ及びダストを含有する高温（通常１０００
℃以上）の排ガスに適用でき、従来どうりＣＯガスを完
全に燃焼させることができ、しかもサーマルＮＯｘの生
成が抑制され、かつ、一部溶融しているダスト類が煙道
（ダクト）内に溶着、固着することがなく、安定した連
続運転が可能な排ガスダクト及びそれを用いた高温排ガ
スの処理方法を提供しようとするものである。In view of the above-mentioned state of the art, the present invention has a high temperature (usually 1000) containing CO and dust.
It can be applied to exhaust gas at temperatures above ℃), can completely burn CO gas as in the past, and suppresses the generation of thermal NOx, and dusts that have partially melted can enter the flue (duct). It is an object of the present invention to provide an exhaust gas duct capable of stable and continuous operation without welding or sticking, and a method for treating high temperature exhaust gas using the same.
【０００５】[0005]
【課題を解決するための手段】本発明は（１）排ガスダ
クト内周に通気可能なセラミック多孔体の内筒を設け、
該内筒と前記ダクトとの間に長さ方向に区画された風室
を形成し、前記ダクトにそれぞれ風室の各区画に連通す
る気体供給ノズルを設け、排ガス流入側の区画内には不
活性ガスを、排ガス出口側の区画内には空気を供給でき
るように構成してなることを特徴とする排ガスダクト、
（２）前記風室の各区画に対応する排ガス流通部に排ガ
ス温度計測手段を設け、排ガス温度が設定値以上の区画
内には不活性ガスを、排ガス温度が設定値未満の区画内
には空気を供給するように構成してなることを特徴とす
る前記（１）の排ガスダクト、（３）前記各気体供給ノ
ズルの先端出口に気体分配手段を設けてなることを特徴
とする前記（１）又は（２）の排ガスダクト及び（４）
排ガスダクト内周に通気可能なセラミック多孔体の内筒
を設け、該内筒と前記ダクトとの間に長さ方向に区画さ
れた風室を形成し、前記ダクトにそれぞれ風室の各区画
に連通する気体供給ノズルを設け、前記風室の各区画に
対応する排ガス流通部に排ガス温度計測手段を設けた排
ガスダクトに、ＣＯ及びダストを含有する高温の排ガス
を通し、排ガス温度が設定値を超える領域の区画には不
活性ガスを供給し、排ガス温度が設定値以下の領域では
空気を供給して冷却することを特徴とする高温排ガスの
処理方法、である。According to the present invention, (1) an inner cylinder of a porous ceramic body is provided on the inner circumference of an exhaust gas duct,
A wind chamber partitioned in the lengthwise direction is formed between the inner cylinder and the duct, and gas supply nozzles that communicate with the respective compartments of the wind chamber are provided in the duct, respectively. Active gas, exhaust gas duct characterized in that it is configured to be able to supply air in the compartment on the exhaust gas outlet side,
(2) Exhaust gas temperature measuring means is provided in the exhaust gas circulation portion corresponding to each section of the wind chamber, and an inert gas is provided in the section where the exhaust gas temperature is equal to or higher than a set value, and an inert gas is provided in the section where the exhaust gas temperature is lower than the set value The exhaust gas duct of the above (1), which is configured to supply air, and (3) the gas distributing means is provided at a tip outlet of each of the gas supply nozzles. ) Or (2) exhaust gas duct and (4)
An inner cylinder of a porous ceramic body is provided on the inner circumference of the exhaust gas duct, and a wind chamber partitioned in the lengthwise direction is formed between the inner cylinder and the duct. A high temperature exhaust gas containing CO and dust is passed through an exhaust gas duct provided with a communicating gas supply nozzle, and an exhaust gas temperature measuring means is provided in an exhaust gas circulation portion corresponding to each section of the wind chamber, and the exhaust gas temperature reaches a set value. A method for treating a high-temperature exhaust gas, which comprises supplying an inert gas to a section in a region exceeding the temperature and supplying air to cool the exhaust gas in a region where a temperature is equal to or lower than a set value.
【０００６】本発明の排ガスダクトは、高温排ガス煙道
（ダクト）の内側に、発泡セラミックス等の通気性のあ
る耐熱性多孔体からなる内筒を配し、その内筒と排ガス
ダクトとの間に風室を設けると共に、排ガスの流れ方向
に多区画に分割された構造とし、各区画にはそれぞれ気
体吹き込みノズルが設けられている。風室の各区画内に
供給された気体は、多孔体である内筒を通過し、排ガス
流通部を流れる排ガス中に噴射され、排ガスを冷却す
る。In the exhaust gas duct of the present invention, an inner cylinder made of a heat-resistant porous body having air permeability such as foam ceramics is arranged inside the high temperature exhaust gas flue (duct), and between the inner cylinder and the exhaust gas duct. In addition to the air chamber, the structure is divided into multiple sections in the exhaust gas flow direction, and each section is provided with a gas blowing nozzle. The gas supplied into each compartment of the wind chamber passes through the inner cylinder, which is a porous body, and is injected into the exhaust gas flowing through the exhaust gas circulation portion to cool the exhaust gas.
【０００７】本発明の好ましい態様として、前記風室の
各区画に対応する排ガス流通部に排ガス温度計測手段を
設け、排ガス温度が設定値（例えば９００℃）を超える
区画内にはＮ2 などの不活性ガスを、排ガス温度が設定
値以下の区画内には空気を供給するように構成する。な
お、通常の場合、排ガス温度が各区画毎に明確に異なる
ことはないので、境界付近の上流側の区画での不活性ガ
スの供給量を調整し、区画付近での温度が設定値に近く
なるよう制御するのが好ましい。As a preferred embodiment of the present invention, an exhaust gas temperature measuring means is provided in an exhaust gas circulation portion corresponding to each compartment of the wind chamber, and N 2 or the like is provided in the compartment where the exhaust gas temperature exceeds a set value (for example, 900 ° C.). The inert gas is configured to supply air into the compartment where the exhaust gas temperature is below the set value. In the normal case, the exhaust gas temperature does not clearly differ for each section, so adjust the amount of inert gas supplied in the upstream section near the boundary so that the temperature near the section is close to the set value. It is preferable to control so that
【０００８】[0008]
【作用】高温（例えば１０００℃以上）のＣＯ及びダス
トを含有する排ガスを処理する場合、そのまま空気と接
触させて冷却すると、ＣＯの完全燃焼は可能であるが、
サーマルＮＯｘの生成割合が多くなる。また、高温領域
ではダスト中の低融点物質は液体で存在し、冷却により
固体へと相変化するが、これらの液相を介するダスト類
がダクト内壁に固着したりなどして閉塞トラブルの原因
となる。When treating an exhaust gas containing high temperature CO (for example, 1000 ° C. or higher) and dust, complete combustion of CO is possible by directly contacting with air and cooling.
The generation rate of thermal NOx increases. Further, in the high temperature region, the low melting point substance in the dust exists as a liquid and undergoes a phase change to a solid due to cooling, but dusts through these liquid phases may cause clogging trouble such as sticking to the inner wall of the duct. Become.
【０００９】本発明の排ガスダクトでは、高温のＣＯ及
びダストを含有する排ガスの冷却操作において、サーマ
ルＮＯｘの生成反応が進行し易い高温領域（通常、約９
００℃以上）での冷却にはＮ2 などの不活性ガスを使用
し、また、ＣＯを完全燃焼させ、かつダスト中の低融点
物質を固体状とするための中温領域（通常約９００℃〜
７５０℃）では冷却媒体として空気を使用することによ
り燃焼の促進をはかっている。In the exhaust gas duct of the present invention, in the cooling operation of the exhaust gas containing high-temperature CO and dust, the high temperature region (generally, about 9) where the reaction of producing thermal NOx easily proceeds.
An inert gas such as N 2 is used for cooling at 00 ° C. or higher), and a medium temperature range (usually about 900 ° C.
At 750 ° C., combustion is promoted by using air as a cooling medium.
【００１０】さらに、溶融による液相を介するダストの
ダクト内壁への溶着、固着防止については、二重構造と
した耐熱性多孔体内筒内面の全面から、均等に冷却用ガ
スを噴射することにより、ダクト内堆積、固着を防止し
ている。Further, in order to prevent the adhesion and adhesion of dust to the inner wall of the duct through the liquid phase due to melting, by uniformly injecting the cooling gas from the entire inner surface of the cylinder of the heat resistant porous body having the double structure, Prevents accumulation and sticking in the duct.
【００１１】[0011]
【実施例】以下実施例により本発明をさらに具体的に説
明する。本発明の排ガスダクトを高温排ガス処理に適用
した例を図１に示す。また、図２は排ガスダクトの縦断
面図、図３（ａ）及び（ｂ）はそれぞれ図２のＡ−Ａ矢
視図及びＢ−Ｂ矢視図である。The present invention will be described in more detail with reference to the following examples. An example in which the exhaust gas duct of the present invention is applied to high temperature exhaust gas treatment is shown in FIG. 2 is a vertical cross-sectional view of the exhaust gas duct, and FIGS. 3 (a) and 3 (b) are views taken along arrows AA and BB of FIG. 2, respectively.
【００１２】図１〜図３において、１はダクト（ケーシ
ング）、２は発泡セラミックなどの通気可能な耐熱性多
孔体（以下、多孔体という）、３は風室、４はＮ2 ガス
などの不活性ガスや空気などの気体供給ノズル、５は多
孔体押えフランジ、６は多孔体固定用金具、７は入口排
ガス、８は出口排ガス、９は不活性ガスや空気などの気
体である。1 to 3, 1 is a duct (casing), 2 is a heat-resistant porous body such as foam ceramic (hereinafter referred to as porous body) that can be aerated, 3 is a wind chamber, 4 is N 2 gas, etc. A gas supply nozzle for inert gas, air or the like, 5 a porous body pressing flange, 6 a metal fitting for fixing a porous body, 7 an inlet exhaust gas, 8 an outlet exhaust gas, 9 a gas such as an inert gas or air.
【００１３】気体９としては高温領域では不活性ガス、
中温領域では空気を使用し、気体供給ノズル４から風室
３に送り込まれ、多孔体２からダクト１の内部に噴射す
ることによって、サーマルＮＯｘの生成を抑制し、ＣＯ
ガスの完全燃焼をはかるとともに、液相が介在するダス
トの内壁への固着によるダクトの閉塞トラブルを防止す
ることができる。不活性ガスとしては例えばＮ2 、Ａｒ
などが用いられる。The gas 9 is an inert gas in the high temperature range,
In the medium temperature range, air is used and is sent from the gas supply nozzle 4 to the wind chamber 3 and is injected from the porous body 2 into the duct 1 to suppress the generation of thermal NOx and to reduce CO
It is possible to prevent the gas from being completely burned and prevent the duct from being clogged due to the adhesion of the dust containing the liquid phase to the inner wall. Examples of the inert gas include N 2 and Ar
Are used.
【００１４】この実施例では、溶融炉出口部に図１、２
に示した構成の排ガスダクトを設けて１３００〜１７０
０℃の排ガスを処理した。排ガス流通部１４内に設置し
た熱電対等の温度計１３により各風室区画出口部の排ガ
ス温度を測定し、温度が９００℃までの区画には不活性
ガスであるＮ2 を供給して冷却し、その後流側（排ガス
温度が９００℃以下）の区画には空気を供給して冷却し
た。その境界部での制御は次のようにして行った。すな
わち、図１において温度計ＴＩＲ２が９００℃となるよ
うに設定し、温度計ＴＩＲ２が９００℃以上のときは流
量調整弁を開、流量調整弁を閉として流量を調整し
ながらＮ2 を供給する。また、温度計ＴＩＲ２が９００
℃未満のときは流量調整弁を閉、流量調整弁を開と
して流量を調整しながら空気を供給してＣＯを燃焼させ
るようにする。In this embodiment, the melting furnace outlet is shown in FIGS.
The exhaust gas duct having the structure shown in FIG.
The exhaust gas at 0 ° C. was treated. The exhaust gas temperature at each outlet of each wind chamber is measured by a thermometer 13 such as a thermocouple installed in the exhaust gas circulation unit 14, and N 2 which is an inert gas is supplied to the space up to 900 ° C to cool it. Then, air was supplied to the section on the downstream side (exhaust gas temperature of 900 ° C. or lower) to cool. The control at the boundary was performed as follows. That is, in FIG. 1, the thermometer TIR2 is set to 900 ° C. When the thermometer TIR2 is 900 ° C. or higher, the flow rate adjusting valve is opened and the flow rate adjusting valve is closed to supply N 2 while adjusting the flow rate. . Also, the thermometer TIR2 is 900
When the temperature is lower than 0 ° C, the flow rate adjusting valve is closed and the flow rate adjusting valve is opened to adjust the flow rate and supply air to burn CO.
【００１５】この実施例では、図２中、Ｌ／Ｄ＝０．５
〜１０とし、多孔体２を通して供給される気体の流速
は、冷却される高温排ガスの流速に対して、０．０５〜
２．０の範囲で運転操作し、かつ、各風室区画出口部の
排ガス温度を測定し、不活性ガスでの冷却を９００℃程
度までとし、その後流側では空気冷却することにより、
ＮＯｘの生成を抑制し、ＣＯの完全燃焼、排ガスダクト
内壁へのダスト付着・固着・堆積などのトラブルを防止
でき、安定な連続運転が可能であった。なお、該噴射気
体の速度比の範囲は対象ガス、低沸点物質や飛散ダスト
の種類や濃度等によって多少異なり、被処理ガスによっ
ては極少量を送気すれば前記トラブルを防止できるもの
もあった。In this embodiment, L / D = 0.5 in FIG.
The flow rate of the gas supplied through the porous body 2 is 0.05 to 10 with respect to the flow rate of the high temperature exhaust gas to be cooled.
By operating in the range of 2.0 and measuring the exhaust gas temperature at each outlet of the wind chambers, cooling with an inert gas up to about 900 ° C., and then air cooling on the flow side,
By suppressing the generation of NOx, it was possible to prevent troubles such as complete combustion of CO and dust adhesion / sticking / accumulation on the inner wall of the exhaust gas duct, and stable continuous operation was possible. The range of the velocity ratio of the jet gas is slightly different depending on the target gas, the type and concentration of the low boiling point substance and the scattered dust, and depending on the gas to be treated, it is possible to prevent the trouble by sending a very small amount. .
【００１６】また、気体供給ノズル４としては種々の形
式のものが適用できるが、他の実施例として、気体供給
ノズル４に各区画毎の多孔体２全表面での噴出速度を均
一化するための機能を付加すべく改良した実施例を図４
（ａ）〜（ｃ）に示す。これらの図は図２のＣ−Ｃ矢視
図に相当するものである。Although various types of gas supply nozzles 4 can be applied, as another embodiment, in order to make the ejection speed of the gas supply nozzle 4 uniform on the entire surface of the porous body 2 in each section. 4 is an embodiment improved to add the function of FIG.
It shows in (a)-(c). These drawings correspond to the view taken along the line CC of FIG.
【００１７】図４（ａ）は気体供給ノズル４をダクト１
の接線方向に取付け、風室３内に旋回流で均一送気し得
るようにしたものであり、図４（ｂ）は気体供給ノズル
４先端部に空気分配管１０を設けたものであり、また、
図４（ｃ）は気体供給ノズル４先端部に多孔体分配体１
１を取り付けたもので、これらにより、各区画毎の多孔
体２から噴出される気体流速を一様に均一化が可能であ
り、図１〜図３によって説明した態様のものと同様に、
安定な連続運転が可能であった。なお、図４中の１２は
気体供給ノズル４の案内管である。FIG. 4A shows the gas supply nozzle 4 and the duct 1
Is attached in a tangential direction to enable uniform air supply in the wind chamber 3 by a swirling flow. FIG. 4B shows an air distribution pipe 10 provided at the tip of the gas supply nozzle 4. Also,
FIG. 4C shows the porous body distributor 1 at the tip of the gas supply nozzle 4.
1, the flow velocity of the gas ejected from the porous body 2 in each compartment can be made uniform by these, and like the embodiment described with reference to FIGS. 1 to 3,
Stable continuous operation was possible. In addition, 12 in FIG. 4 is a guide tube of the gas supply nozzle 4.
【００１８】耐熱性多孔体２の材質としてはコージェラ
イト、アルミナ含有コージェライト、アルミナ、炭化ケ
イ素、窒化ケイ素、その他金属（ＳＵＳなど）の多孔性
焼結体などが使用可能である。As the material of the heat-resistant porous body 2, cordierite, alumina-containing cordierite, alumina, silicon carbide, silicon nitride, or a porous sintered body of other metal (such as SUS) can be used.
【００１９】ちなみに不活性ガス、空気等の供給ガスは
常温のものを用いたが、耐熱性多孔体の両面における温
度差が著しいため、用いる多孔体の材質によっては加温
したガスを供給するのが好ましい場合もある。By the way, as the supply gas such as the inert gas and the air, those which are at normal temperature were used. However, since the temperature difference between both surfaces of the heat resistant porous body is remarkable, heated gas may be supplied depending on the material of the porous body used. May be preferable.
【００２０】[0020]
【発明の効果】ダスト及びＣＯを含有する高温の排ガス
を冷却処理するに当たり、本発明の排ガスダクトを採用
し、排ガスの温度領域により冷却ガスの種類を変えるこ
とにより、サーマルＮＯｘが生成せず、ＣＯの完全燃焼
がはかれ、かつ、一部溶融したダストがダクト内へ固着
・堆積し閉塞するトラブルを防止できるので、安定した
連続運転が可能で低公害な高温排ガス処理法を提供で
き、その工業的効果は顕著である。また、排ガス温度を
検知しながら不活性ガスの供給を行うことにより、高価
な不活性ガスの消費量を抑制し、より安価な処理を行う
ことができる。In cooling the high temperature exhaust gas containing dust and CO, by adopting the exhaust gas duct of the present invention and changing the type of the cooling gas depending on the temperature range of the exhaust gas, thermal NOx is not generated, Since CO can be completely burned and dust that is partly melted can be prevented from sticking and accumulating in the duct to be clogged, it is possible to provide a high-temperature exhaust gas treatment method capable of stable continuous operation and low pollution. The industrial effect is remarkable. Further, by supplying the inert gas while detecting the temperature of the exhaust gas, it is possible to suppress the consumption of the expensive inert gas and perform a cheaper treatment.
【００２１】本発明の排ガスダクト及びそれを使用した
高温の排ガス処理方法は、特にＮ2プラズマ加熱炉排ガ
スなどダスト及びＣＯを含有するＮ2 主体の高温排ガス
の処理に好適であるあが、他形式の溶融炉などの高温排
ガス処理操作にも適用可能である。The exhaust gas duct of the present invention and the method for treating high temperature exhaust gas using the same are particularly suitable for treating high temperature exhaust gas mainly containing N 2 containing dust and CO such as exhaust gas from N 2 plasma heating furnace. It is also applicable to high temperature exhaust gas treatment operations such as type of melting furnace.
【図１】本発明の排ガスダクトを高温排ガス処理に適用
した例を示す説明図。FIG. 1 is an explanatory view showing an example in which an exhaust gas duct of the present invention is applied to high temperature exhaust gas treatment.
【図２】図１の排ガスダクトの縦断面図。FIG. 2 is a vertical cross-sectional view of the exhaust gas duct of FIG.
【図３】図２のＡ−Ａ及びＢ−Ｂ矢視図。FIG. 3 is a view taken along arrows AA and BB of FIG.
【図４】図２の気体供給ノズルの他の形式をしめすＣ−
Ｃ矢視図。FIG. 4 shows another type of the gas supply nozzle of FIG.
C arrow view.
【図５】従来の溶融炉の排ガスダクトの一態様の説明
図。FIG. 5 is an explanatory view of one mode of an exhaust gas duct of a conventional melting furnace.
【図６】図５のＡ−Ａ及びＢ−Ｂ矢視図。6 is a view taken along arrows AA and BB of FIG.
Claims (4)
ク多孔体の内筒を設け、該内筒と前記ダクトとの間に長
さ方向に区画された風室を形成し、前記ダクトにそれぞ
れ風室の各区画に連通する気体供給ノズルを設け、排ガ
ス流入側の区画内には不活性ガスを、排ガス出口側の区
画内には空気を供給するように構成してなることを特徴
とする排ガスダクト。1. An inner cylinder of a porous ceramic body that can be ventilated is provided on the inner circumference of an exhaust gas duct, and a wind chamber partitioned in the lengthwise direction is formed between the inner cylinder and the duct, and air is blown into each of the ducts. Exhaust gas characterized by being provided with a gas supply nozzle communicating with each compartment of the chamber, and supplying inert gas in the compartment on the exhaust gas inflow side and air in the compartment on the exhaust gas outlet side duct.
部に排ガス温度計測手段を設け、排ガス温度が設定値以
上の区画内には不活性ガスを、排ガス温度が設定値未満
の区画内には空気を供給するように構成してなることを
特徴とする請求項１記載の排ガスダクト。2. An exhaust gas temperature measuring means is provided in an exhaust gas circulation portion corresponding to each compartment of the wind chamber, and an inert gas is contained in the compartment where the exhaust gas temperature is equal to or higher than a preset value, and an exhaust gas temperature is within the compartment where the exhaust gas temperature is lower than the preset value. The exhaust gas duct according to claim 1, wherein air is supplied to the exhaust gas duct.
分配手段を設けてなることを特徴とする請求項１又は２
に記載の排ガスダクト。3. The gas distributing means is provided at the tip outlet of each of the gas supply nozzles.
Exhaust gas duct described in.
ク多孔体の内筒を設け、該内筒と前記ダクトとの間に長
さ方向に区画された風室を形成し、前記ダクトにそれぞ
れ風室の各区画に連通する気体供給ノズルを設け、前記
風室の各区画に対応する排ガス流通部に排ガス温度計測
手段を設けた排ガスダクトに、ＣＯ及びダストを含有す
る高温の排ガスを通し、排ガス温度が設定値を超える領
域の区画には不活性ガスを供給し、排ガス温度が設定値
以下の領域では空気を供給して冷却することを特徴とす
る高温排ガスの処理方法。4. An inner cylinder of a porous ceramic body which can be ventilated is provided on the inner circumference of the exhaust gas duct, and a wind chamber partitioned in the lengthwise direction is formed between the inner cylinder and the duct, and air is blown into each of the ducts. A high-temperature exhaust gas containing CO and dust is passed through an exhaust gas duct provided with a gas supply nozzle communicating with each compartment of the chamber and an exhaust gas temperature measuring means provided in an exhaust gas circulation portion corresponding to each compartment of the air chamber, A method for treating high-temperature exhaust gas, which comprises supplying an inert gas to a section in a region where the temperature exceeds a set value and supplying air to cool the exhaust gas in a region where the temperature is below the set value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7026495A JPH08219437A (en) | 1995-02-15 | 1995-02-15 | Exhaust gas duct and treating method of high-temperature exhaust gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7026495A JPH08219437A (en) | 1995-02-15 | 1995-02-15 | Exhaust gas duct and treating method of high-temperature exhaust gas |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08219437A true JPH08219437A (en) | 1996-08-30 |
Family
ID=12195080
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7026495A Withdrawn JPH08219437A (en) | 1995-02-15 | 1995-02-15 | Exhaust gas duct and treating method of high-temperature exhaust gas |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08219437A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11304137A (en) * | 1998-04-24 | 1999-11-05 | Mitsubishi Heavy Ind Ltd | Treatment of exhaust gas of ash melting furnace and ash melting furnace |
| JP2007071423A (en) * | 2005-09-05 | 2007-03-22 | Takuma Co Ltd | Secondary combustion device |
| CN107327860A (en) * | 2017-08-22 | 2017-11-07 | 厦门理工学院 | A kind of flue dustproof device and its method of work |
| WO2024255900A1 (en) * | 2023-06-16 | 2024-12-19 | 拉普拉斯新能源科技股份有限公司 | Gas cooling apparatus and heat furnace |
-
1995
- 1995-02-15 JP JP7026495A patent/JPH08219437A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11304137A (en) * | 1998-04-24 | 1999-11-05 | Mitsubishi Heavy Ind Ltd | Treatment of exhaust gas of ash melting furnace and ash melting furnace |
| JP2007071423A (en) * | 2005-09-05 | 2007-03-22 | Takuma Co Ltd | Secondary combustion device |
| CN107327860A (en) * | 2017-08-22 | 2017-11-07 | 厦门理工学院 | A kind of flue dustproof device and its method of work |
| WO2024255900A1 (en) * | 2023-06-16 | 2024-12-19 | 拉普拉斯新能源科技股份有限公司 | Gas cooling apparatus and heat furnace |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20020507 |