JPH03170614A - Combustion method in heating furnace - Google Patents
Combustion method in heating furnaceInfo
- Publication number
- JPH03170614A JPH03170614A JP30715889A JP30715889A JPH03170614A JP H03170614 A JPH03170614 A JP H03170614A JP 30715889 A JP30715889 A JP 30715889A JP 30715889 A JP30715889 A JP 30715889A JP H03170614 A JPH03170614 A JP H03170614A
- Authority
- JP
- Japan
- Prior art keywords
- combustion
- heating furnace
- atmosphere
- skelp
- heated
- 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
- 238000010438 heat treatment Methods 0.000 title claims abstract description 38
- 238000009841 combustion method Methods 0.000 title claims description 20
- 238000002485 combustion reaction Methods 0.000 claims abstract description 49
- 239000000463 material Substances 0.000 claims abstract description 12
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 9
- 239000000446 fuel Substances 0.000 abstract description 10
- 238000000034 method Methods 0.000 abstract description 6
- 235000010627 Phaseolus vulgaris Nutrition 0.000 abstract 1
- 244000046052 Phaseolus vulgaris Species 0.000 abstract 1
- 230000001590 oxidative effect Effects 0.000 description 18
- 239000007789 gas Substances 0.000 description 11
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000000571 coke Substances 0.000 description 2
- 238000002309 gasification Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 241000555745 Sciuridae Species 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
この発明は、二層雰囲気燃焼バーナーを備えた加熱炉の
燃焼方法に関する．
［従来技術］
一般の加熱炉におけるバーナーの燃焼は、空気比１．Ｌ
〜１．２で燃焼させいる．そのため、燃焼ガスの雰囲気
は過剰酸素を含む酸化性雰囲気となっている．その結果
被加熱材は酸化性雰囲気にさらされながら加熱されるこ
とになり、スクールの発生量が多くなり、これによる歩
留低下が多きかった．
また、一般的な直火式無酸化燃焼方式は、水性ガス化反
応理論に基づく無酸化雰囲気が得られる空気比で燃焼さ
せ，ている．水性ガス化反応理論に基づく無酸化雰囲気
は、燃料を空気比１．０以下の不完全燃焼により得られ
る燃焼ガス中のＣｏ／Ｃ０２およびＨ．／Ｈ２０の値で
決定され、これらの値は第４図に示すように加熱温度に
よって異なる．すなわち、第４図から分かるように加熱
温度が高くなればなるほど、無酸化雰囲気を得るために
は、Ｃ Ｏ ／ Ｃ Ｏ ＊の値を大きくする必要があ
り、一般の加熱炉（加熱温度ｌ２００〜１３００℃）で
はＣｏ／ＣＯ２ ＝３．１〜３．３を確保する必要があ
る．この無酸化雰囲気を得るための設定空気比は燃料組
成により若干異なり、コークス炉ガスの場合は第５図に
示すように０．５である．
このように従来行なわれている直火式の無酸化加熱方式
では、燃料を極端に不完全燃焼させるので、火炎温度が
低下し、その結果加熱能率が低下する．また、多Ｉの未
燃分が発生するので、燃料原単位が非常に低下するとい
う欠点があった．このような従来の直火式無酸化燃焼方
式の欠点を改善してスケールの発生を抑制し、しかも加
熱能率が低下せず燃料原単位が悪化しない直火式無酸化
燃焼方式として特開昭６０−２ １ ５７ １ ６号公
報に開示された技術がある．この技術においては第６図
のように加熱する被加熱材２１を囲む領域２２を空気比
１．０未満で燃焼させ、この領域２２の燃焼で発生、４
シた未燃分を領域２２の外側の領域２３で燃焼させるよ
うにしている．この加熱炉の燃焼方法により，スケール
発生率が低下し、しかも加熱に要する時間および燃料原
単位も従来とほとんど変わらないという効果が得られて
いる．
［発明が解決しようとする課題］
しかしながら、従来の二層雰囲気による加熱炉の燃焼方
法においては、次のような問題点があった．すなわち、
例えば鍛接管スケルプ加熱炉の例で説明すると、スケル
プの進行方向に添って加熱炉の両側壁からバーナーが２
００〜３ ０ ０ ａｍ間隔で配置されているが、炉壁
にはスケルブを受けるためのスキッドが固定されている
箇所があるので、そのような場所ではバーナーの間隔は
広がらざるをえない．そして、炉内のスキッド後方のス
ケルプを囲む領域の雰囲気は燃料の供給が途切れるので
、無酸化雰囲気を維持できず、この区間ではスケルプが
酸化されスケールが発生するという問題点があった．
この発明は、上記したような従来技術の問題点を解消し
、加熱炉のどの部分においてもスケールの発生を低く抑
えることができる加熱炉の燃焼方法を提供することを目
的としている．
［課題を解決するための手段］
この発明に係る加熱炉の燃焼方法は、被加熱材を囲む領
域を空気比１．０未満で燃焼させ、この領域の燃焼で発
生した未燃分を該領域の外側で燃焼させる加熱炉の燃焼
方法において、炉のバーナー間隔の広がる部分の燃焼排
ガス上流側の１本以上のバーナーは前記未燃分を燃焼さ
せるための２次空気の供給量を絞り、バーナー間隔の広
がる部分の被加熱材を囲む領域の雰囲気が不完全燃焼雰
囲気となるように燃焼させる加熱炉の燃焼方法である．
［作用］
この発明に係る加熱炉の燃焼方法は、被加熱材を囲む領
域を空気比１．０未満で燃焼させ、この領域の燃焼で発
生した未燃分を該領域の外側で燃焼させる加熱炉の燃焼
方法において、炉のバーナー間隔の広がる部分の燃焼排
ガス上流側の１本以上のバーナーは前記未燃分を燃焼さ
せるための２次空気の供給量を絞るようにして燃焼させ
ている．この理由は、バーナー間隔の広がっている部分
の燃焼排ガス上流側で、バーナー間隔の狭まっている部
分と同じ量の２次空気を供給すると、バーナー間隔の広
がっている部分では燃料の噴射が行なわれていないため
、必然的に被加熱材を囲む領域の雰囲気が、排ガス上流
側から流れてくる２次燃焼後の排ガスにより、無酸化雰
囲気から酸化雰囲気へと移行し、被加熱材が酸化されて
スケールが発生するからである．したがって、バーナー
間隔の広がっている部分の燃焼排ガス上流側では、２次
空気の供給量を絞り、バーナー間隔の広がっている部分
の被加熱材を囲む領域の雰囲気が無酸化雰囲気を保つよ
うにしている．［実施例］
本発明の１実施例の加熱炉の燃焼方法を鍛接管スケルプ
加熱炉の場合において説明する．第１図は鍛接管スケル
プ加熱炉の断面図であり、第２図は第１図のＡ−Ａ矢視
である．この鍛接管スケルプ加熱炉１は、両側の炉壁２
に１次燃焼ボート３と、１次燃焼ポート３の近傍上下に
スリット状２次燃焼ボート４を設けている．そして、１
次燃焼ボート３には燃焼バーナーを配置して、燃料を空
気比０．４５で燃焼させてスケルブ５を囲む領域６に無
酸化雰囲気を形戒させてスケルブ５を加熱するとともに
、２次燃焼ボート４からは２次燃焼用空気を炉内の領ｊ
！ｌｉ６の外側の領域７に吹き込んで、１次燃焼で生じ
た未燃分を完全燃焼させるようにしている．
第２図で分かるように、１次燃焼ボート３および２次燃
焼ボート４は、鍛接管スケルプ加熱炉１の炉壁２に添っ
て２００〜３ ０ ０ ａｍ間隔で、しかも両炉壁２間
では千鳥状になるように配置されているが、ところどこ
ろにスゲルプ５を支えるスキッド８があり、その部分で
は１次ｍ焼ボート３および２次燃焼ボート４の間隔は広
くなっている．
このような、１次燃焼ボート３および２次燃焼ボート４
の間隔が広くなっている燃焼排ガスの流れの上流側（第
２図の■〜■〉の２次燃焼ボート４から、２次燃焼用空
気を間隔が狭い部分と同じ量吹き込むとスキッド部分で
は燃料が燃焼されない結果として、スケルプ５を囲む領
域に排ガス上流側から流れてくる２次燃焼後の排ガス（
酸化性雰囲気ガス）が侵入し、スケルプ５を囲む領域の
雰囲気が無酸化雰囲気から酸化雰囲気へと移行する．そ
の結果スケルプ５が酸化されスケールが発生する．
そこで、本発明の１実施例の加熱炉の燃焼方法において
は、１次燃焼ボート３および２次燃焼ボート４の間隔が
広くなっている燃焼排ガスの流れの上流側（第２図の■
〜■〉の２次燃焼ボート４から供給する２次燃焼空気の
供給量を、第３図の２次空気弁９を絞って間隔が狭いと
ころよりも少なくするようにしている．なお第３図の１
０は１次空気弁である．
第１表は第２図の■〜■の位置の２次空気弁の開度を全
開の１／４に絞り、他の位置では全開にした場合のスキ
ッド直後の位置のＣＯ濃度（％〉を、■〜■の位置の２
次空気弁の開度を全開とした場合と比較して示したもの
である．第１表から明らかなように、■〜■の位置の２
次空気弁の開度を全開の１／４に絞った場合には、全開
の場合よりも大幅にＣＯ濃度（％〉の向上が認められ、
理想的な無酸化雰囲気となっているが分かる．第 １
表 （％〉備考：２ＯＡ．３２Ａ
は鍛接管の呼称径本発明の１実施例の加熱炉の燃焼方法
においては、従来技術と比較して少なくとも０．３％の
スケールロスの低減が確認されており、月間数万トンを
生産する鍛接管工場の場合にはその経済的な効果は大き
い．
［発明の効果］
この発明により，加熱炉のどの位Ｉにおいても被加熱材
に生成されるスケールの発生を最小限に抑えることがで
きる．[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a combustion method in a heating furnace equipped with a two-layer atmosphere combustion burner. [Prior Art] Burner combustion in a general heating furnace is performed at an air ratio of 1. L
Burn it at ~1.2. Therefore, the combustion gas atmosphere is an oxidizing atmosphere containing excess oxygen. As a result, the material to be heated was heated while being exposed to an oxidizing atmosphere, resulting in a large amount of schooling, which led to a significant drop in yield. In addition, the general direct-fire non-oxidizing combustion method uses combustion at an air-to-air ratio that provides a non-oxidizing atmosphere based on the theory of water gasification reactions. The non-oxidizing atmosphere based on the water gasification reaction theory is based on Co/C02 and H. /H20, and these values vary depending on the heating temperature, as shown in Figure 4. That is, as can be seen from Fig. 4, the higher the heating temperature, the larger the value of C O / C O * needs to be in order to obtain a non-oxidizing atmosphere. 1300℃), it is necessary to ensure Co/CO2 = 3.1 to 3.3. The air ratio set to obtain this non-oxidizing atmosphere varies slightly depending on the fuel composition, and in the case of coke oven gas, it is 0.5 as shown in Figure 5. In the conventional direct-fire non-oxidation heating method, the fuel is burned extremely incompletely, resulting in a decrease in flame temperature and, as a result, a decrease in heating efficiency. In addition, since unburned matter containing a large amount of I is generated, there is a drawback that the fuel consumption rate is greatly reduced. Unexamined Japanese Patent Application Publication No. 1988 (1982) was developed as a direct-fired non-oxidative combustion method which improves the drawbacks of the conventional direct-fired non-oxidative combustion method and suppresses the formation of scale, and which does not reduce the heating efficiency or worsen the fuel consumption rate. There is a technique disclosed in Publication No.-215716. In this technique, as shown in FIG. 6, a region 22 surrounding a material to be heated 21 to be heated is combusted at an air ratio of less than 1.0, and the combustion of this region 22 generates 4
The unburned content is burned in a region 23 outside the region 22. This heating furnace combustion method has the effect of reducing the scale generation rate, and also keeping the time and fuel consumption required for heating almost the same as before. [Problems to be Solved by the Invention] However, the conventional combustion method in a heating furnace using a two-layer atmosphere has the following problems. That is,
For example, in the case of a forged-welded pipe skelp heating furnace, two burners are installed from both side walls of the heating furnace along the direction of progress of the skelp.
The burners are spaced at intervals of 0.00 to 3.00 am, but there are places on the furnace wall where skids are fixed to receive the squirrels, so the spacing between the burners has to be widened in such places. In addition, the atmosphere in the area surrounding the skelp at the rear of the skid in the furnace was not able to maintain a non-oxidizing atmosphere because the fuel supply was interrupted, and there was a problem in that the skelp was oxidized and scale formed in this area. The present invention aims to solve the problems of the prior art as described above and to provide a combustion method for a heating furnace that can suppress the generation of scale in any part of the heating furnace. [Means for Solving the Problems] A heating furnace combustion method according to the present invention involves burning an area surrounding a material to be heated at an air ratio of less than 1.0, and discharging unburned matter generated by combustion in this area. In a heating furnace combustion method in which combustion is performed outside of the furnace, one or more burners on the upstream side of the combustion exhaust gas in the part where the burner spacing is widened restricts the supply amount of secondary air for burning the unburned matter, and This is a heating furnace combustion method in which combustion is performed so that the atmosphere in the region surrounding the material to be heated at the widening interval becomes an incomplete combustion atmosphere. [Operation] The heating furnace combustion method according to the present invention is a heating method in which a region surrounding a material to be heated is combusted at an air ratio of less than 1.0, and unburned matter generated by combustion in this region is combusted outside the region. In the furnace combustion method, one or more burners on the upstream side of the combustion exhaust gas in the part of the furnace where the burner spacing is widened are used to perform combustion by restricting the amount of secondary air supplied to burn the unburned components. The reason for this is that if the same amount of secondary air is supplied upstream of the combustion exhaust gas in the area where the burner spacing is wide as in the area where the burner spacing is narrow, fuel injection will not occur in the area where the burner spacing is wide. Therefore, the atmosphere in the area surrounding the heated material inevitably shifts from a non-oxidizing atmosphere to an oxidizing atmosphere due to the exhaust gas flowing from the upstream side of the exhaust gas after secondary combustion, and the heated material is oxidized. This is because scale occurs. Therefore, on the upstream side of the combustion exhaust gas where the burner spacing is wide, the amount of secondary air supplied is restricted to maintain a non-oxidizing atmosphere in the area surrounding the heated material where the burner spacing is wide. There is. [Example] A combustion method of a heating furnace according to an embodiment of the present invention will be explained in the case of a forge-welded pipe squelp heating furnace. Fig. 1 is a sectional view of a forge-welded pipe skelp heating furnace, and Fig. 2 is a view taken along the line A-A in Fig. 1. This forged welded pipe squelp heating furnace 1 has furnace walls 2 on both sides.
A primary combustion boat 3 and a slit-shaped secondary combustion boat 4 are provided above and below the primary combustion port 3. And 1
A combustion burner is arranged in the secondary combustion boat 3 to burn fuel at an air ratio of 0.45 to create a non-oxidizing atmosphere in the area 6 surrounding the squelve 5 to heat the squelve 5. From 4 onwards, the air for secondary combustion is transferred to the area inside the furnace.
! It is blown into the outer region 7 of the li 6 to completely burn the unburned matter produced in the primary combustion. As can be seen in FIG. 2, the primary combustion boats 3 and the secondary combustion boats 4 are spaced along the furnace wall 2 of the forged-welded tube skelp heating furnace 1 at intervals of 200 to 300 am, and between both furnace walls 2. Although they are arranged in a staggered manner, there are skids 8 that support the Sgelp 5 in some places, and the distance between the primary combustion boats 3 and the secondary combustion boats 4 is wide in these areas. Such a primary combustion boat 3 and a secondary combustion boat 4
If the same amount of secondary combustion air is blown from the secondary combustion boat 4 on the upstream side of the flue gas flow where the gaps are wide (■ to ■ in Figure 2) as in the areas where the gaps are narrow, the fuel will be absorbed in the skid area. As a result, the exhaust gas after secondary combustion (
(oxidizing atmospheric gas) enters, and the atmosphere in the area surrounding the squelp 5 changes from a non-oxidizing atmosphere to an oxidizing atmosphere. As a result, Skelp 5 is oxidized and scale is generated. Therefore, in the heating furnace combustion method according to one embodiment of the present invention, the interval between the primary combustion boat 3 and the secondary combustion boat 4 is widened on the upstream side of the flow of combustion exhaust gas (
The amount of secondary combustion air supplied from the secondary combustion boat 4 in ~■> is made smaller than that in the case where the interval is narrow by throttling the secondary air valve 9 in Fig. 3. Note that 1 in Figure 3
0 is the primary air valve. Table 1 shows the CO concentration (%) at the position immediately after the skid when the opening degree of the secondary air valve at positions ■ to ■ in Figure 2 is reduced to 1/4 of the fully open position, and the other positions are fully open. , ■～■ position 2
The figure below shows a comparison with the case where the air valve opening is fully open. As is clear from Table 1, 2 in positions ■～■
Next, when the opening degree of the air valve was reduced to 1/4 of the fully open position, the CO concentration (%) was significantly improved compared to when it was fully open.
It can be seen that the atmosphere is an ideal non-oxidizing atmosphere. 1st
Table (%) Notes: 2OA.32A
is the nominal diameter of the forge-welded pipe.In the heating furnace combustion method of one embodiment of the present invention, it has been confirmed that scale loss is reduced by at least 0.3% compared to the conventional technology, and tens of thousands of tons can be produced per month. In the case of forge-welded pipe factories, the economic effects are significant. [Effects of the Invention] According to the present invention, it is possible to minimize the scale generated on the heated material at any point I in the heating furnace.
第１図は本発明の１実施例の加熱炉の燃焼方法を実施し
た鍛接管スケルブ加熱炉の横断面図、第２図は第１図の
Ａ−Ａ矢視図、第３図は１，２次燃焼空気用配管を示す
説明図、第４図は鉄の酸化・還元平衡図、第５図はコー
クスガスの空気比とＣｏ／Ｃｏ２，Ｈ２ ／｝Ｉａ Ｏ
ｆ）関係を示すグラフ図、第６図は加熱炉の二層雰囲気
燃焼法を示す説明図である．Fig. 1 is a cross-sectional view of a forged pipe squelve heating furnace in which the heating furnace combustion method of one embodiment of the present invention is implemented, Fig. 2 is a view taken along the line A-A in Fig. 1, and Fig. 3 is a 1, An explanatory diagram showing the secondary combustion air piping, Figure 4 is an oxidation/reduction equilibrium diagram of iron, and Figure 5 is the coke gas air ratio and Co/Co2, H2 /}Ia O
f) Graph diagram showing the relationship, Figure 6 is an explanatory diagram showing the two-layer atmosphere combustion method in the heating furnace.
Claims (1)
この領域の燃焼で発生した未燃分を該領域の外側で燃焼
させる加熱炉の燃焼方法において、炉のバーナー間隔の
広がる部分の燃焼排ガス上流側の１本以上のバーナーは
前記未燃分を燃焼させるための２次空気の供給量を絞り
、バーナー間隔の広がる部分の被加熱材を囲む領域の雰
囲気が不完全燃焼雰囲気となるように燃焼させることを
特徴とする加熱炉の燃焼方法。Burning the area surrounding the material to be heated at an air ratio of less than 1.0,
In a heating furnace combustion method in which unburned matter generated by combustion in this region is combusted outside this region, one or more burners on the upstream side of the combustion exhaust gas in the part where the burner interval of the furnace is widened burns the unburned matter. A combustion method for a heating furnace, characterized in that the amount of secondary air supplied for heating is reduced, and combustion is performed so that the atmosphere in the area surrounding the heated material in the part where the burner interval is widened becomes an incomplete combustion atmosphere.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1307158A JP2669082B2 (en) | 1989-11-27 | 1989-11-27 | Combustion method of heating furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1307158A JP2669082B2 (en) | 1989-11-27 | 1989-11-27 | Combustion method of heating furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03170614A true JPH03170614A (en) | 1991-07-24 |
| JP2669082B2 JP2669082B2 (en) | 1997-10-27 |
Family
ID=17965726
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1307158A Expired - Fee Related JP2669082B2 (en) | 1989-11-27 | 1989-11-27 | Combustion method of heating furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2669082B2 (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59133317A (en) * | 1983-01-19 | 1984-07-31 | Sumitomo Metal Ind Ltd | Operating method of direct firing type clean heating furnace |
| JPS62228430A (en) * | 1986-03-31 | 1987-10-07 | Nippon Kokan Kk <Nkk> | Method for heating steel material |
-
1989
- 1989-11-27 JP JP1307158A patent/JP2669082B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59133317A (en) * | 1983-01-19 | 1984-07-31 | Sumitomo Metal Ind Ltd | Operating method of direct firing type clean heating furnace |
| JPS62228430A (en) * | 1986-03-31 | 1987-10-07 | Nippon Kokan Kk <Nkk> | Method for heating steel material |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2669082B2 (en) | 1997-10-27 |
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| LAPS | Cancellation because of no payment of annual fees |