JPH0478883B2 - - Google Patents
Info
- Publication number
- JPH0478883B2 JPH0478883B2 JP59064362A JP6436284A JPH0478883B2 JP H0478883 B2 JPH0478883 B2 JP H0478883B2 JP 59064362 A JP59064362 A JP 59064362A JP 6436284 A JP6436284 A JP 6436284A JP H0478883 B2 JPH0478883 B2 JP H0478883B2
- Authority
- JP
- Japan
- Prior art keywords
- sulfuric acid
- waste heat
- temperature
- boiler
- deaerator
- 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.)
- Expired - Lifetime
Links
Landscapes
- Degasification And Air Bubble Elimination (AREA)
Description
産業上の利用分野
この発明は、硫酸製造プラントにおいて製造直
後の高温硫酸の廃熱を回収して脱気器供給水また
はボイラー供給水を加熱する硫酸廃熱回収装置に
関する。
従来技術
通常、製造直後の高温硫酸の冷却は硫酸温度
100〜110℃で行なわれ、生じた冷却廃熱は温度40
℃前後の低レベルであるので、単にこれを二次流
体と熱交換しても利用価値はほとんどなく、使用
済み冷却水とともに廃棄されている。そこでこの
利用不可能な硫酸廃熱を脱気器供給水またはボイ
ラー供給水の加熱用熱源として利用することが考
えられる。
ところで通常の硫酸冷却は冷却器の腐蝕を抑え
るために100℃以下で行なわれており、冷却媒体
として温度20〜30℃の冷水が使用され、冷却器の
伝熱面の温度が60〜70℃以下に抑えられている。
しかしこの従来タイプの冷却器を硫酸廃熱回収用
熱交換器としてそのまま適用して、脱気器供給水
またはボイラー供給水を加熱しようとすると、作
動媒体温度が高いため伝熱面の温度が硫酸温度付
近にまで上昇するので、このような適用は熱交換
器の耐食性の点で全く不可能である。さらに熱回
収効率の向上を目的としてより高温すなわち110
℃以上の硫酸を取扱う場合にも、従来の熱交換器
はやはり耐食性の点で全く使用不可能である。
発明の目的
この発明は上記の点に鑑みなされたものであつ
て、硫酸製造プラントにおける製造直後の高温硫
酸廃熱を回収して脱気器供給水およびボイラー供
給水を加熱するために使用しても腐蝕のおそれの
ない硫酸廃熱回収装置を提供することを目的とす
る。
発明の構成
この発明による硫酸廃熱回収装置は、硫酸製造
プラントにおける製造直後の高温硫酸の廃熱を回
収するために冷却用媒体として脱気器供給水およ
びボイラー供給水を用いる廃熱回収において、廃
熱回収用熱交換器として、陽極防食法を施した熱
交換器１，９が脱気器２の上流およびボイラー４
の上流に設けられているものである。
陽極防食法（Anodic Protecion）は、防食電
流により陽極部表面に酸化被膜を形成させて、そ
の被膜を保持することにより腐蝕を防止するもの
であり、これ自身は公知技術である。
実施例と作用
以下、図面に示す実施例によりこの発明を具体
的に説明する。
実施例 １（参考例）
第１図において、硫酸製造プラントで得られた
製造直後の高温硫酸は、廃熱回収用の熱交換器１
に通され、低温のボイラー水（脱気器供給水）と
熱交換し、冷却される。この熱交換器１は陽極防
食法を施した熱交換器である。
熱交換器１で硫酸廃熱を回収したボイラー水
は、脱気器２に入り、減圧器３で発生する低圧ス
チームＡと、ボイラー４のブローダウン装置５か
ら回収した低圧の回収スチームＢとによつて加熱
されて、脱気される。脱気れたボイラー水は、ポ
ンプ６によりエコノマイザー７を介してボイラー
４へ導かれ、ここで高温高圧のスチームＣを発生
させる。スチームＣは加熱器８で過熱され、その
一部は減圧器３へ導かれ、低圧スチームＡとなつ
て、脱気器２に入る。
実施例 ２
陽極防食法を施した熱交換器は、通常の運転温
度ではもちろんのこと、材料の選定によりさらに
高温（120〜180℃）の硫酸に対しても適用でき
る。第２図は高温操作によつて廃熱回収効率を向
上させる場合の実施例を示すものであり、熱交換
器１と同じく陽極防食法を施した熱交換器９をエ
コノマイザー７の上流に設け、高温硫酸との熱交
換により脱気器２からのボイラー供給水を加熱す
る。
発明の効果
この発明の硫酸廃熱回収装置によれば、廃熱回
収用熱交換器として、陽極防食法を施した熱交換
器１，９が脱気器２の上流およびボイラー４の上
流に配されているので、硫酸廃熱を効率よく回収
して、この熱を脱気器供給水およびボイラー供給
水の加熱に有効に利用することができる。さら
に、この発明の硫酸廃熱回収装置は、高温（120
〜180℃）の硫酸に対しても適用でき、高温操作
によつて廃熱回収効率を向上させることができ
る。その結果下記表１に示すように、加熱用低圧
スチームの消費を節減して、ボイラーで発生する
スチームのうち高圧スチームとして利用できる割
合を増大させることができる。
なお、表１は、この発明による硫酸廃熱回収装
置を2000トン／日の硫酸製造装置に適用して高圧
スチームを発生させる場合の効果を示したもので
ある。
INDUSTRIAL APPLICATION FIELD This invention relates to a sulfuric acid waste heat recovery device for recovering the waste heat of high-temperature sulfuric acid immediately after production in a sulfuric acid production plant to heat deaerator feed water or boiler feed water. Conventional technology Normally, high-temperature sulfuric acid is cooled to the sulfuric acid temperature immediately after production.
It is carried out at 100-110℃, and the resulting cooling waste heat has a temperature of 40℃.
Since it is at a low level of around °C, simply exchanging heat with a secondary fluid has little utility value, and is discarded together with used cooling water. Therefore, it is conceivable to use this unusable sulfuric acid waste heat as a heat source for heating the deaerator feed water or boiler feed water. By the way, normal sulfuric acid cooling is performed at a temperature below 100℃ to prevent corrosion of the cooler, and cold water at a temperature of 20 to 30℃ is used as the cooling medium, and the temperature of the heat transfer surface of the cooler is 60 to 70℃. It is kept below.
However, when this conventional type of cooler is used as a heat exchanger for sulfuric acid waste heat recovery to heat deaerator feed water or boiler feed water, the temperature of the heat transfer surface is high due to the high working medium temperature. Such an application is simply not possible due to the corrosion resistance of the heat exchanger, since the temperature rises to near the vicinity of that temperature. Furthermore, to improve heat recovery efficiency, higher temperatures, i.e. 110
Even when dealing with sulfuric acid at temperatures above 0.degree. C., conventional heat exchangers are still completely unusable due to corrosion resistance. Purpose of the Invention The present invention has been made in view of the above points, and is a method of recovering high-temperature sulfuric acid waste heat immediately after production in a sulfuric acid production plant and using it to heat deaerator feed water and boiler feed water. Another object of the present invention is to provide a sulfuric acid waste heat recovery device that is free from corrosion. Composition of the Invention The sulfuric acid waste heat recovery device according to the present invention is a waste heat recovery device that uses deaerator feed water and boiler feed water as cooling media to recover the waste heat of high-temperature sulfuric acid immediately after production in a sulfuric acid production plant. As heat exchangers for waste heat recovery, heat exchangers 1 and 9 subjected to anodic corrosion protection are installed upstream of the deaerator 2 and the boiler 4.
It is installed upstream of the The anodic protection method is a method in which corrosion is prevented by forming an oxide film on the surface of the anode part using an anticorrosion current and maintaining the film, and this method itself is a known technique. Embodiments and Effects The present invention will be specifically explained below with reference to embodiments shown in the drawings. Example 1 (Reference example) In Fig. 1, high-temperature sulfuric acid obtained in a sulfuric acid production plant immediately after production is transferred to heat exchanger 1 for waste heat recovery.
The water is passed through the water, exchanges heat with low-temperature boiler water (deaerator supply water), and is cooled. This heat exchanger 1 is a heat exchanger subjected to an anodic corrosion protection method. The boiler water from which sulfuric acid waste heat has been recovered in the heat exchanger 1 enters the deaerator 2 and is converted into low pressure steam A generated in the pressure reducer 3 and low pressure recovered steam B recovered from the blowdown device 5 of the boiler 4. It is then heated and degassed. The deaerated boiler water is guided by the pump 6 through the economizer 7 to the boiler 4, where high-temperature, high-pressure steam C is generated. The steam C is superheated by the heater 8, and a part of it is guided to the pressure reducer 3, becomes low pressure steam A, and enters the deaerator 2. Example 2 A heat exchanger subjected to an anodic corrosion protection method can be used not only at normal operating temperatures, but also at higher temperatures (120 to 180° C.) of sulfuric acid depending on the selection of materials. Figure 2 shows an example in which waste heat recovery efficiency is improved by high-temperature operation, in which a heat exchanger 9, which has been subjected to an anodic corrosion protection method like the heat exchanger 1, is installed upstream of the economizer 7. , heats the boiler feed water from the deaerator 2 by heat exchange with hot sulfuric acid. Effects of the Invention According to the sulfuric acid waste heat recovery apparatus of the present invention, heat exchangers 1 and 9 subjected to anodic corrosion protection are arranged upstream of the deaerator 2 and upstream of the boiler 4 as heat exchangers for waste heat recovery. Therefore, the sulfuric acid waste heat can be efficiently recovered and this heat can be effectively used for heating the deaerator feed water and the boiler feed water. Furthermore, the sulfuric acid waste heat recovery device of this invention has a high temperature (120
It can also be applied to sulfuric acid (up to 180°C), and waste heat recovery efficiency can be improved by high-temperature operation. As a result, as shown in Table 1 below, the consumption of low-pressure steam for heating can be reduced, and the proportion of steam generated in the boiler that can be used as high-pressure steam can be increased. Table 1 shows the effects when the sulfuric acid waste heat recovery apparatus according to the present invention is applied to a 2000 ton/day sulfuric acid production apparatus to generate high-pressure steam.
【表】【table】
第１図および第２図はスチーム発生装置におけ
る硫酸廃熱回収装置のフロー図である。
１……熱交換器、２……脱気器、３……減圧
器、４……ボイラー、５……ブローダウン装置、
６……ポンプ、７……エコノマイザー、８……過
熱器、９……熱交換器、Ａ……低圧スチーム、Ｂ
……回収スチーム、Ｃ……高圧スチーム。
1 and 2 are flow diagrams of a sulfuric acid waste heat recovery device in a steam generator. 1... heat exchanger, 2... deaerator, 3... pressure reducer, 4... boiler, 5... blowdown device,
6... Pump, 7... Economizer, 8... Superheater, 9... Heat exchanger, A... Low pressure steam, B
...Recovery steam, C...High pressure steam.
Claims (1)
酸の廃熱を回収するために、冷却用媒体として脱
気器供給水およびボイラー供給水を用いる廃熱回
収装置において、廃熱回収用熱交換器として、陽
極防食法を施した熱交換器１，９が脱気器２の上
流およびボイラー４の上流に設けられていること
を特徴とする、硫酸廃熱回収装置。1 In order to recover the waste heat of high-temperature sulfuric acid immediately after production in a sulfuric acid production plant, an anode is used as a heat exchanger for waste heat recovery in a waste heat recovery device that uses deaerator feed water and boiler feed water as cooling media. A sulfuric acid waste heat recovery device characterized in that heat exchangers 1 and 9 subjected to corrosion protection are provided upstream of a deaerator 2 and upstream of a boiler 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6436284A JPS60207805A (en) | 1984-03-30 | 1984-03-30 | Sulfuric acid waste heat recovery equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6436284A JPS60207805A (en) | 1984-03-30 | 1984-03-30 | Sulfuric acid waste heat recovery equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60207805A JPS60207805A (en) | 1985-10-19 |
| JPH0478883B2 true JPH0478883B2 (en) | 1992-12-14 |
Family
ID=13256074
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6436284A Granted JPS60207805A (en) | 1984-03-30 | 1984-03-30 | Sulfuric acid waste heat recovery equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60207805A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5984506B2 (en) * | 2012-05-23 | 2016-09-06 | パンパシフィック・カッパー株式会社 | Utilization method and system of waste heat in sulfuric acid production facility |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5479305A (en) * | 1977-12-07 | 1979-06-25 | Hitachi Ltd | Method of deairing boiler feed-water and its system |
| JPS5824363B2 (en) * | 1978-03-09 | 1983-05-20 | 日立造船株式会社 | Preheating and waste heat recovery method for sulfuric acid production equipment |
| JPS5940908B2 (en) * | 1981-04-13 | 1984-10-03 | 日立造船株式会社 | Acid cooler using anodic corrosion protection method |
| JPS5819620A (en) * | 1981-07-28 | 1983-02-04 | Kenichi Nakagawa | Collecting method for heat from waste gas |
-
1984
- 1984-03-30 JP JP6436284A patent/JPS60207805A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60207805A (en) | 1985-10-19 |
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