JPS60232487A - Recovery device for exhaust heat in heating furnace - Google Patents
Recovery device for exhaust heat in heating furnaceInfo
- Publication number
- JPS60232487A JPS60232487A JP8903584A JP8903584A JPS60232487A JP S60232487 A JPS60232487 A JP S60232487A JP 8903584 A JP8903584 A JP 8903584A JP 8903584 A JP8903584 A JP 8903584A JP S60232487 A JPS60232487 A JP S60232487A
- Authority
- JP
- Japan
- Prior art keywords
- heat
- heating furnace
- temperature
- exhaust gas
- heat exchanger
- 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
Landscapes
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、鉄鋼プラントにおける連続式加熱炉並びにバ
ッチ式加熱炉等の排熱回収装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an exhaust heat recovery device for continuous heating furnaces, batch heating furnaces, etc. in steel plants.
従来、加熱炉の燃焼系は、第１図に示すように加熱炉（
１）に連通ずる煙道（２）内に、燃焼用空気を排熱回収
により予熱するための熱交換器（３）を備え、燃焼用空
気供給用の送風機（４）からの空気供給管（５）をこの
熱交換器（３）に接続してバーナ（６）へ予熱された空
気を供給する構成が一般的であった。Conventionally, the combustion system of a heating furnace is a heating furnace (
A heat exchanger (3) for preheating the combustion air by exhaust heat recovery is provided in the flue (2) communicating with the combustion air duct (2), and an air supply pipe ( 5) is connected to this heat exchanger (3) to supply preheated air to the burner (6).
これに対し、近来では排熱回収効率を向上させるために
、第２図に示すように燃料を予熱するための熱交換器（
７）を煙道（２）に設は燃料供給管（８）をこれに接続
したり、第３図に示すように排ガスボイラ（９）を設置
するシステムとしたものが稼動している。In contrast, in recent years, in order to improve waste heat recovery efficiency, heat exchangers (
7) is installed in the flue (2) and a fuel supply pipe (8) is connected thereto, or a system in which an exhaust gas boiler (9) is installed as shown in FIG. 3 is in operation.
一方、近年の鉄鋼プロセスでは、連続鋳造設備が設置さ
れる例がほとんどで加熱炉に装入される被熱材温度も高
温となり、煙道に入る排ガス温度が１０００℃〜１１０
０℃にも達する。しかし、鋼種や生産スケジュール絡み
で、常温から装入することを必要とする被熱材もあり、
この場合煙道に入る排ガス温度は６００℃〜７００℃程
度である。On the other hand, in recent steel processes, in most cases continuous casting equipment is installed, the temperature of the heated material charged into the heating furnace is also high, and the temperature of the exhaust gas entering the flue is 1000°C to 110°C.
It reaches 0℃. However, depending on the steel type and production schedule, there are some heated materials that require charging from room temperature.
In this case, the temperature of the exhaust gas entering the flue is about 600°C to 700°C.
このように排ガス温度が異なる操業条件であっても有効
な排熱回収を可能としたものに特公昭５６−１ｓｓｏ号
公報や特公昭５６−７１５３号公報に記載されたような
排熱利用装置がある。これは、常温装入時には、煙道に
設置した熱交換器で燃焼用空気を予熱し、高温装入時に
は、熱交換器と排ガスボイラの組合せで熱回収を図り、
有効熱エネルギ量に合わせて排熱回収を行なうものであ
る。ところが、この装置では、排ガスボイラによって得
られた蒸気又は電力を有効に利用してはじめて効果を発
揮するもので、蒸気又は電力を必要としない加熱炉並び
に工場としては、設備自体が無駄であり、排熱回収量も
有効エネルギとして再利用できない。Exhaust heat utilization devices such as those described in Japanese Patent Publication No. 56-1sso and Japanese Patent Publication No. 7153-1987 have made it possible to effectively recover waste heat even under operating conditions where the exhaust gas temperature differs. be. When charging at room temperature, the combustion air is preheated by a heat exchanger installed in the flue, and when charging at high temperature, a combination of heat exchanger and exhaust gas boiler is used to recover heat.
Exhaust heat is recovered according to the amount of effective thermal energy. However, this device is only effective if it effectively uses the steam or electricity obtained from the exhaust gas boiler, and the equipment itself is useless as a heating furnace or factory that does not require steam or electricity. The amount of waste heat recovered cannot be reused as effective energy.
本発明の目的は、加熱炉からの排ガス熱量を、その熱量
の大小にかかわらず燃焼用空気または燃料ガス予熱用と
して有効に熱回収できるようにすることである。An object of the present invention is to enable effective heat recovery of exhaust gas heat from a heating furnace for use in preheating combustion air or fuel gas, regardless of the magnitude of the heat.
本発明の構成は、加熱炉に連通ずる煙道に、燃焼空気ま
たは燃料ガス予熱用の熱交換器を設け、同熱交換器の上
流又は下流側にＮ熱装置を配置し、高温排ガス流動時に
同蓄熱装置に蓄えられた熱エネルギを、排ガス温度が低
下した時に燃焼用空気または燃料ガスの予熱源として機
能させるようにしたものである。The structure of the present invention is that a heat exchanger for preheating combustion air or fuel gas is provided in the flue communicating with the heating furnace, and an N heat device is placed upstream or downstream of the heat exchanger, and when high-temperature exhaust gas flows, The thermal energy stored in the heat storage device is used as a preheat source for combustion air or fuel gas when the exhaust gas temperature drops.
〔発明の１乍用〕
本発明は、上記構成により高温装入時に蓄熱した熱エネ
ルギを、常温装入時の排ガス温度が低い場合に燃焼用空
気または燃料ガスのための予熱源とすることができ、排
ガス温度の高低によらず排熱を有効に回収することがで
きる。[Aspect 1 of the Invention] The present invention has the above-described structure, so that the thermal energy stored during high-temperature charging can be used as a preheating source for combustion air or fuel gas when the exhaust gas temperature is low during normal-temperature charging. This makes it possible to effectively recover exhaust heat regardless of whether the exhaust gas temperature is high or low.
以下、第４図に示す実施例に基いて本発明を説明する。 The present invention will be explained below based on the embodiment shown in FIG.
加熱炉（１１と煙突−間を連絡する煙道（２）の中途に
は従来と同様に送風機（４）からの燃焼用空気を予熱す
るための熱交換器（３）が配置され、空気供給管（５）
からバーナ（６）への空気が予熱される。（１１）は熱
交換器（３）の上流側に配置される蓄熱装置で、煙道（
２）内に受熱部（１２）を有するとともに空気供給管（
５）の中途から分岐するバイパス管（５ａ）内に放熱部
（１３）を備えている。蓄熱装置（１１）は排ガス顕熱
を蓄熱材料の潜熱を利用して熱回収して蓄熱するもので
、蓄熱材料としてはＬｉＦ等を用いる。A heat exchanger (3) for preheating the combustion air from the blower (4) is placed in the middle of the flue (2) connecting the heating furnace (11) and the chimney, as in the past, and the air supply pipe (5)
The air from the burner (6) is preheated. (11) is a heat storage device placed upstream of the heat exchanger (3), and the flue (
2) has a heat receiving part (12) inside and an air supply pipe (
5) A heat dissipation section (13) is provided in the bypass pipe (5a) that branches from the middle. The heat storage device (11) recovers and stores sensible heat from exhaust gas using latent heat of a heat storage material, and uses LiF or the like as the heat storage material.
上記システムにおいて、煙道（２）を通過する排ガスが
高温の場合には、排熱の一部は蓄熱装置（１１）の受熱
部（１２）により同装置内に蓄熱され、他しま熱交換器
（３）内で熱回収されて燃焼用空気を予熱した後、煙突
００）から排出される。従って、排力゛スが高温である
場合には蓄熱装置（１１）に熱エネルギが貯蔵されると
ともに、熱交換器（３）により燃焼用−空気が予熱され
る。In the above system, when the exhaust gas passing through the flue (2) is high temperature, a part of the exhaust heat is stored in the heat receiving part (12) of the heat storage device (11), and the other heat exchanger After the heat is recovered in (3) and preheats the combustion air, it is discharged from the chimney 00). Therefore, when the exhaust gas is at a high temperature, thermal energy is stored in the heat storage device (11) and the combustion air is preheated by the heat exchanger (3).
また、排ガス温度が低下した時には、上記によって蓄え
られた熱エネルギが放熱部（１３）を介してバイパス管
（５ａ）内の空気予熱に利用され、かつ熱交換器（３）
内でも予熱されてノ＼−す（６）へ供給される。Furthermore, when the exhaust gas temperature decreases, the thermal energy stored as described above is used to preheat the air in the bypass pipe (5a) via the heat radiating section (13), and the heat exchanger (3)
It is also preheated inside and supplied to the nozzle (6).
以上のように、加熱炉（１１内の燃焼効率を高めるバー
ナー燃焼用空気の予熱に排ガス回収熱を利用でき、しか
も従来では放出せざるを得なかった高温装入時の熱を蓄
熱装置（１１）に蓄熱することにより常温装入時に有効
に利用できる。従って、従来では常温装入時の熱交換器
の温度効率ア・ノブを図るために大型熱交換器を設置し
ていたが、燃焼用空気は熱交換器（３）及び蓄熱装置（
１１）の放熱により二段予熱されるので、小型の熱交換
器で十分であり、装置容量及び設備費を低減できる。As described above, exhaust gas recovery heat can be used to preheat the burner combustion air that increases the combustion efficiency in the heating furnace (11), and the heat storage device (11 ), it can be used effectively when charging at room temperature.Therefore, conventionally, large heat exchangers were installed to increase the temperature efficiency of the heat exchanger during charging at room temperature. The air is passed through a heat exchanger (3) and a heat storage device (
Since two-stage preheating is performed by the heat dissipation in step 11), a small heat exchanger is sufficient, and the device capacity and equipment cost can be reduced.
第５図は蓄熱装置（１１）を熱交換器（３）下流側へ設
置した例で、このレイアウトの場合蓄熱材料としてＬｉ
Ｃ１−Ｋ Ｃ１，ＮａＮＯ３−ＮａＯＨ等が効果的であ
る。Figure 5 shows an example where the heat storage device (11) is installed downstream of the heat exchanger (3). In this layout, Li is used as the heat storage material.
C1-K C1, NaNO3-NaOH, etc. are effective.
本例においても、高温排ガスの時に蓄熱した熱エネルギ
を常温装入時における空気予熱に利用することにより排
熱を有効に回収して利用できる。In this example as well, exhaust heat can be effectively recovered and used by utilizing the thermal energy stored during high-temperature exhaust gas for air preheating during charging at room temperature.
第６図は、蓄熱装置α０）の放熱部（１３）を燃料供給
管ｆ８）のバイパス管（８ａ）内に設けて、燃料力スを
予熱するようにしたものである。本例では、高温排ガス
通過時に蓄えられた蓄熱装置（１１）内の熱エネルギを
排ガス温度低下時に放熱して燃料力スを予熱するもので
、熱交換器（３）で予熱された燃焼用空気とともに加熱
炉（１）内の燃焼温度を降下させることなく燃焼効率の
低下を防止できる。In FIG. 6, the heat radiating part (13) of the heat storage device α0) is provided in the bypass pipe (8a) of the fuel supply pipe f8) to preheat the fuel power. In this example, the heat energy stored in the heat storage device (11) when high-temperature exhaust gas passes through is radiated when the exhaust gas temperature drops to preheat the fuel. Combustion air preheated by the heat exchanger (3) At the same time, a reduction in combustion efficiency can be prevented without lowering the combustion temperature in the heating furnace (1).
本発明によれば、加熱炉からの排ガス温度が変動しても
、高温時に蓄熱装置内に蓄えられた熱工ネルギを燃焼用
空気または燃料ガスの予熱に利用できるので、加熱炉内
の燃焼温度を降下させることなく高効率の燃焼が可能で
あり、排熱を全て有効エネルギとして回収することが・
できる。According to the present invention, even if the exhaust gas temperature from the heating furnace fluctuates, the thermal energy stored in the heat storage device at high temperatures can be used to preheat the combustion air or fuel gas, so that the combustion temperature in the heating furnace Highly efficient combustion is possible without reducing heat, and all waste heat can be recovered as effective energy.
can.
第１図は従来の加熱炉の燃焼系を示す概略構成図、第２
図は燃料ガス予熱用熱交換器を設置した燃焼系の概略構
成図、第３図は排ガスボイラを設置した場合の概略構成
図、第４図は本発明に係る加熱炉燃焼系の概略構成図、
第５図、第６図は他の実施例を示す概略構成図である。
（１）：加熱炉 （２）：煙道
（３）：熱交換器 （４）：送風機
（５）：空気供給管 （５ａ＞ ：バイパス管（６）：
バーナ （７）：熱交換器
（８）：燃料供給管 （８ａ） ：バイパス管（９）：
排ガスボイラ ａＯ）：煙突
（１１）二Ｎ熱装置 （１２） ：受熱部（１３） ：
放熱部
第１図
■
第３図
第４図Figure 1 is a schematic configuration diagram showing the combustion system of a conventional heating furnace.
The figure is a schematic diagram of a combustion system in which a heat exchanger for preheating fuel gas is installed, Figure 3 is a schematic diagram of a combustion system in which an exhaust gas boiler is installed, and Figure 4 is a schematic diagram of a combustion system in a heating furnace according to the present invention. ,
FIGS. 5 and 6 are schematic configuration diagrams showing other embodiments. (1): Heating furnace (2): Flue (3): Heat exchanger (4): Blower (5): Air supply pipe (5a>: Bypass pipe (6):
Burner (7): Heat exchanger (8): Fuel supply pipe (8a): Bypass pipe (9):
Exhaust gas boiler aO): Chimney (11) 2N heat device (12): Heat receiving part (13):
Heat dissipation part Fig. 1 ■ Fig. 3 Fig. 4
Claims (1)
上流又は下流側の煙道に廃ガス熱量を回収する蓄熱装置
を設けてなり、高温廃ガス流通時に前記蓄熱装置により
廃ガス熱量を蓄熱し、該廃ガス熱量を低温廃ガス流通時
において燃焼用空気文は一燃料ガスの予熱源にさせるよ
うに構成してなる加熱炉における排熱回収装置。1. A heat exchanger is installed in the flue connected to the heating furnace, and a heat storage device for recovering waste gas heat is installed in the flue upstream or downstream of the heat exchanger, and the heat storage device is installed when high-temperature waste gas is distributed. 1. An exhaust heat recovery device for a heating furnace configured to store waste gas calorific value by heating the waste gas, and use the combustion air as a preheating source for fuel gas when low-temperature waste gas is flowing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8903584A JPS60232487A (en) | 1984-05-02 | 1984-05-02 | Recovery device for exhaust heat in heating furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8903584A JPS60232487A (en) | 1984-05-02 | 1984-05-02 | Recovery device for exhaust heat in heating furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60232487A true JPS60232487A (en) | 1985-11-19 |
Family
ID=13959636
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8903584A Pending JPS60232487A (en) | 1984-05-02 | 1984-05-02 | Recovery device for exhaust heat in heating furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60232487A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5533200U (en) * | 1975-06-11 | 1980-03-03 |
-
1984
- 1984-05-02 JP JP8903584A patent/JPS60232487A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5533200U (en) * | 1975-06-11 | 1980-03-03 |
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