JP2856651B2 - Exhaust heat recovery type scrubber and exhaust heat recovery method - Google Patents
Exhaust heat recovery type scrubber and exhaust heat recovery methodInfo
- Publication number
- JP2856651B2 JP2856651B2 JP5275324A JP27532493A JP2856651B2 JP 2856651 B2 JP2856651 B2 JP 2856651B2 JP 5275324 A JP5275324 A JP 5275324A JP 27532493 A JP27532493 A JP 27532493A JP 2856651 B2 JP2856651 B2 JP 2856651B2
- Authority
- JP
- Japan
- Prior art keywords
- heat recovery
- scrubber
- temperature
- exhaust gas
- exhaust heat
- 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
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
- Y02P80/15—On-site combined power, heat or cool generation or distribution, e.g. combined heat and power [CHP] supply
Landscapes
- Chimneys And Flues (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Description
【0001】[0001]
【産業上の利用分野】本発明は、焼却炉等から排出され
る高温の排ガスを洗浄処理するために使用される排熱回
収型スクラバ及びこれを用いた排熱回収方法に関するも
のである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust heat recovery type scrubber used for cleaning high-temperature exhaust gas discharged from an incinerator or the like, and an exhaust heat recovery method using the same.
【0002】[0002]
【従来の技術】焼却炉や各種の工業炉から排出されるダ
スト、SOX 、HCl 等を含んだ高温の排ガスを洗浄処理す
るための手段として、従来からスクラバが使用されてい
る。このスクラバは周知のように、排ガスに対して大量
の洗浄水またはカセイソーダの水溶液を噴射し、排ガス
中のダストを水側に移行させると同時に、SOX 等を除去
するものである。2. Description of the Related Art Scrubbers have conventionally been used as a means for cleaning high-temperature exhaust gas containing dust, SO X , HCl and the like discharged from incinerators and various industrial furnaces. The scrubber as is known, by injecting an aqueous solution of a large amount of washing water or sodium hydroxide with respect to the exhaust gas, at the same time shifts the dust in the exhaust gas to the water side, and removing the SO X or the like.
【0003】[0003]
【発明が解決しようとする課題】このためにスクラバか
らは大量の排水が排出されることとなるが、その排水温
度は40〜50℃であるのが普通であり、無駄に放出されて
いるのが普通であった。また最近ではこの排水から熱回
収することも検討されているが、排水温度が低いために
30〜40℃程度の低温の温水供給か、暖房用熱源程度の利
用法しかなく、有効な排熱の利用が行えなかった。A large amount of wastewater is discharged from the scrubber, and the temperature of the wastewater is usually 40 to 50 ° C., and the wastewater is discharged wastefully. Was normal. In recent years, heat recovery from this wastewater has been considered, but due to the low temperature of the wastewater,
There is only a method of using hot water at a low temperature of about 30 to 40 ° C or a heat source for heating, and effective use of waste heat was not possible.
【0004】本発明はこのような従来の問題点を解決し
て、スクラバの機能を低下させることなくその排水から
有効に熱回収を図ることができる排熱回収型スクラバ及
び排熱回収方法を提供するためになされたものである。The present invention solves such a conventional problem, and provides an exhaust heat recovery type scrubber and an exhaust heat recovery method capable of effectively recovering heat from the wastewater without deteriorating the function of the scrubber. It was done to do so.
【0005】[0005]
【課題を解決するための手段】上記の課題を解決するた
めになされた本発明の排熱回収型スクラバは、高温の排
ガスを洗浄処理するスラクバを前後2段に分離して直列
に接続するとともに、前段のスラクバの排水温度を60℃
以上に保持し、その排水流出部に熱回収手段を設けたこ
とを特徴とするものである。また本発明の排熱回収方法
は、高温の排ガスを排水温度が60℃以上に保持された前
段のスラクバと、これに直列に接続された後段のスラク
バに順次通して洗浄処理するとともに、高温の排ガスの
持つ熱を前段のスラクバの排水流出部に設けられた熱回
収手段により熱回収することを特徴とするものである。
なお本発明において前段のスラクバの排水温度を60℃以
上に限定したのは、これよりも低温では温水等として熱
回収される温度が低く、スクラバを前後に分離すること
による設備面の負担と引き合わないためである。SUMMARY OF THE INVENTION An exhaust heat recovery type scrubber according to the present invention, which has been made to solve the above-mentioned problems, separates a scrubber for cleaning a high-temperature exhaust gas into two stages before and after, and connects them in series. 60 ℃
It is characterized in that it is held as described above and a heat recovery means is provided in the drainage outflow portion. In the exhaust heat recovery method of the present invention, the high-temperature exhaust gas is sequentially passed through a pre-stage slab bar in which the waste water temperature is maintained at 60 ° C. or higher and a post-stage slab bar connected in series to the high-temperature exhaust gas to perform the cleaning process. It is characterized in that the heat of the exhaust gas is recovered by a heat recovery means provided at the drainage outflow portion of the preceding slab.
In the present invention, the drainage temperature of the former stage scrubber is limited to 60 ° C. or higher because at a lower temperature, the temperature of heat recovery as hot water or the like is low, and the burden on facilities due to separating the scrubber back and forth is taken into account. Because there is no.
【0006】[0006]
【作用】本発明の排熱回収型スクラバは、焼却炉等から
の高温の排ガスを前後2段のスクラバに順次通して排ガ
ス中のダスト、SOX 、HCl 等を除去するものであるが、
前段のスクラバに供給される洗浄水の量を減少させる
か、スクラバを通過することにより加熱された洗浄水を
再利用することにより、前段のスクラバの排水温度を60
℃以上に保持する。そして前段のスラクバの排水流出部
に設けられた熱回収手段によりこの60℃以上の高温の排
水から熱回収を行う。このために従来よりも効果的な熱
回収を図ることができる。しかも前段のスクラバを通過
した排ガスは後段のスクラバによって再度洗浄されるの
で、前段のスクラバに供給される洗浄水の量を減少させ
たような場合にも、排ガス処理性能が低下するおそれは
ない。The exhaust heat recovery type scrubber of the present invention removes dust, SO X , HCl and the like in the exhaust gas by sequentially passing high temperature exhaust gas from an incinerator and the like through two stages of scrubbers before and after.
By reducing the amount of washing water supplied to the preceding scrubber, or by reusing the washing water heated by passing through the scrubber, the drainage temperature of the preceding scrubber can be reduced by 60%.
Keep above ℃. Then, heat is recovered from the high-temperature wastewater having a temperature of 60 ° C. or higher by the heat recovery means provided at the wastewater outflow part of the preceding slab. For this reason, heat recovery more effective than before can be achieved. Moreover, the exhaust gas that has passed through the former scrubber is washed again by the latter scrubber, so that even when the amount of washing water supplied to the former scrubber is reduced, there is no possibility that the exhaust gas treatment performance will be reduced.
【0007】[0007]
【実施例】以下に本発明を図示の実施例によって更に詳
細に説明する。図1において、1は前段のスクラバ、2
は後段のスクラバであり、焼却炉等からの高温の排ガス
は図示のように前段のスクラバ1を通過する間に洗浄さ
れ、更に後段のスクラバ2を通過する間に完全に洗浄さ
れるようになっている。BRIEF DESCRIPTION OF THE DRAWINGS FIG. In FIG. 1, reference numeral 1 denotes a scrubber in a preceding stage;
Is a downstream scrubber, and high-temperature exhaust gas from an incinerator or the like is washed while passing through the upstream scrubber 1 as shown in the figure, and is completely washed while passing through the downstream scrubber 2. ing.
【0008】各スクラバ1、2にはそれぞれ洗浄水噴射
ノズル3、4が設けられている。洗浄水はまず後段のス
クラバ2の洗浄水噴射ノズル4に対して新水が供給さ
れ、後段のスクラバ2からの排水の一部は弁5から系外
に放出されるが、残部は弁6を介して前段のスクラバ1
側に供給されている。前段のスクラバ1からの排水もそ
の一部は弁7から系外に放出されているが、残部は弁8
を介してリターンされ、後段のスクラバ2からの排水と
ともに洗浄水噴射ノズル3に供給されるようになってい
る。The scrubbers 1 and 2 are provided with washing water injection nozzles 3 and 4 respectively. First, fresh water is supplied to the washing water injection nozzle 4 of the scrubber 2 at the subsequent stage, and a part of the drainage from the scrubber 2 at the subsequent stage is discharged from the valve 5 to the outside of the system. Scrubber 1 in the first stage through
Has been supplied to the side. Part of the waste water from the scrubber 1 at the preceding stage is also discharged out of the system from the valve 7, while the rest is discharged from the valve 8.
And is supplied to the washing water injection nozzle 3 together with the drainage from the scrubber 2 at the subsequent stage.
【0009】このように、実施例では前段のスクラバ1
の洗浄水噴射ノズル3に供給される洗浄水は前段または
後段のスクラバ1、2を通過することによって加熱され
た洗浄水であり、新水に比較してかなりの高温となって
いる。このために前段のスクラバ1の排水温度も常に60
℃以上に保持されており、前段のスラクバ1の排水流出
部に設けられた熱回収手段9がこの高温の排水から効率
よく熱回収を行うことができる。実施例では熱回収手段
9は温水として熱を回収する形式のものであるが、必ず
しもこれに限定されるものではない。As described above, in the embodiment, the former scrubber 1
The cleaning water supplied to the cleaning water injection nozzle 3 is cleaning water heated by passing through the scrubbers 1 and 2 in the preceding or subsequent stage, and has a considerably higher temperature than fresh water. For this reason, the drain temperature of the scrubber 1 in the former stage is always 60
C. or more, and the heat recovery means 9 provided at the drainage outflow part of the preceding slab bar 1 can efficiently recover heat from the high-temperature wastewater. In the embodiment, the heat recovery means 9 is of a type that recovers heat as hot water, but is not necessarily limited to this.
【0010】実施例では、前段のスラクバ1の排水流出
部に温度センサ10が設置されており、弁6と弁8の開度
を調節することにより、常に前段のスクラバ1の排水温
度が60℃以上に保持されるように制御を行っている。In the embodiment, a temperature sensor 10 is provided at the drainage outflow portion of the preceding stage scrubber 1. By controlling the opening of the valves 6 and 8, the drainage temperature of the preceding stage scrubber 1 is always 60 ° C. The control is performed so as to be held as described above.
【0011】各部分を流れる流体の温度、流量等の具体
例は図1に記入した通りであり、まず前段のスラクバ1
に導かれる焼却炉の排ガスは270 ℃、500Nm3/hrであ
り、その絶対湿度は0.46kg−H2O/kg−ドライガスであ
る。この排ガスは前段のスラクバ1から70℃の飽和湿度
のガスとなって後段のスクラバ2に入り、40℃の飽和湿
度のガスとなって大気中に放出される。Specific examples of the temperature, flow rate, etc. of the fluid flowing through each part are as shown in FIG.
The exhaust gas from the incinerator led to 270 ° C. and 500 Nm 3 / hr, and its absolute humidity was 0.46 kg-H 2 O / kg-dry gas. This exhaust gas is converted into a gas having a saturation humidity of 70 ° C. from the first stage scrubber 1 and enters the second stage scrubber 2 to be released into the atmosphere as a gas having a saturation humidity of 40 ° C.
【0012】後段のスクラバ2の洗浄水噴射ノズル4に
対して供給される新水は20℃で3.2m3/hrであり、後段の
スクラバ2を通過する間に上記した70℃の排ガスとの接
触により35℃まで加熱されて排水となる。そのうちの1.
7m3/hrは35℃の排水として弁5から放出される。しかし
残部の1.6m3/hrの部分は弁6を介して前段のスラクバ1
に入り、弁8を介してリターンされてきた65℃、1.7m3/
hrの前段のスラクバ1の排水とともに洗浄水噴射ノズル
3に供給される。その結果、洗浄水噴射ノズル3には50
℃、3.3m3/hrの洗浄水が供給されることとなる。The fresh water supplied to the washing water injection nozzle 4 of the downstream scrubber 2 is 3.2 m 3 / hr at 20 ° C., and the fresh water with the above 70 ° C. exhaust gas passes through the downstream scrubber 2. It is heated to 35 ° C by contact and becomes waste water. One of them.
7 m 3 / hr is discharged from the valve 5 as 35 ° C. wastewater. However, the remaining 1.6 m 3 / hr part was passed through valve 6 to
65 ° C, 1.7m 3 /
The water is supplied to the washing water injection nozzle 3 together with the drainage of the slab bar 1 at the preceding stage of the hr. As a result, 50
C., 3.3 m 3 / hr of washing water will be supplied.
【0013】この洗浄水は、270 ℃、500Nm3/hr の高温
の排ガスとの接触により加熱され、70℃、3.4m3/hrの高
温の排水となって前段のスラクバ1から排出される。そ
して熱回収手段9に供給される55℃、1.6m3/hrの水を65
℃まで加熱することができる。熱回収手段9を通過した
排水は65℃となり、弁7から1.7m3/hrが放出され、残部
の1.7m3/hrの部分が弁8を介してリターンされている。
この実施例では、前段のスラクバ1の排水温度を70℃に
維持することにより、熱回収手段9が65℃の高温水とし
て熱回収を行っており、従来の低温の排水からの熱回収
よりも利用価値の高い高温水を得ることができる。The washing water is heated by contact with exhaust gas having a high temperature of 270 ° C. and 500 Nm 3 / hr, and is discharged as a high-temperature wastewater of 70 ° C. and 3.4 m 3 / hr from the preceding slab bar 1. Then, the water supplied to the heat recovery means 9 at 55 ° C. and 1.6 m 3 / hr
Can be heated to ° C. The waste water that has passed through the heat recovery means 9 has a temperature of 65 ° C., and 1.7 m 3 / hr is discharged from the valve 7. The remaining 1.7 m 3 / hr is returned via the valve 8.
In this embodiment, the heat recovery means 9 recovers heat as high-temperature water at 65 ° C. by maintaining the wastewater temperature of the former slab bar 1 at 70 ° C., which is lower than the conventional heat recovery from low-temperature wastewater. High-value high-temperature water can be obtained.
【0014】[0014]
【発明の効果】以上に説明したように、本発明の排熱回
収型スクラバ及びこれによる排熱回収方法によれば、ス
ラクバを前後2段に分離し、前段のスラクバの排水温度
を60℃以上に保持して高温の排ガスの持つ熱を熱回収手
段により熱回収するようにしたので、スクラバ本来の機
能を低下させることなくその排水から有効に熱回収を図
ることができる利点がある。このようにして回収された
高温水等は、温度が60℃前後と高いために従来のような
暖房用熱源以外にも、多くの用途に利用することができ
る。As described above, according to the exhaust heat recovery type scrubber and the exhaust heat recovery method using the same according to the present invention ,
The scrubber is separated into two stages , the drainage temperature of the preceding stage is maintained at 60 ° C or higher, and the heat of the high-temperature exhaust gas is recovered by the heat recovery means. There is an advantage that heat can be effectively recovered from the wastewater. The high-temperature water and the like thus recovered can be used for many uses other than the conventional heating heat source because the temperature is as high as about 60 ° C.
【図1】本発明の実施例を示す系統図である。FIG. 1 is a system diagram showing an embodiment of the present invention.
1 前段のスクラバ、2 後段のスクラバ、9 熱回収
手段1 scrubber at the first stage, 2 scrubbers at the second stage, 9 heat recovery means
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.6,DB名) F27D 17/00 101 F27D 17/00 104 F23G 5/44 F23J 15/04──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. 6 , DB name) F27D 17/00 101 F27D 17/00 104 F23G 5/44 F23J 15/04
Claims (2)
前後2段に分離して直列に接続するとともに、前段のス
ラクバの排水温度を60℃以上に保持し、その排水流出部
に熱回収手段を設けたことを特徴とする排熱回収型スク
ラバ。1. A scrubber for cleaning high-temperature exhaust gas
An exhaust heat recovery type scrubber characterized in that it is separated in two stages and connected in series, the drainage temperature of the preceding stage is maintained at 60 ° C. or higher, and a heat recovery means is provided at the drainage outlet.
持された前段のスラクバと、これに直列に接続された後
段のスラクバに順次通して洗浄処理するとともに、高温
の排ガスの持つ熱を前段のスラクバの排水流出部に設け
られた熱回収手段により熱回収することを特徴とする排
熱回収方法。2. A high-temperature exhaust gas is successively passed through a former-stage slab bar whose drainage temperature is maintained at 60 ° C. or higher and a subsequent-stage slab bar connected in series with the former to perform a cleaning treatment, and the heat of the high-temperature exhaust gas is removed. An exhaust heat recovery method, wherein heat is recovered by a heat recovery means provided at a drainage outflow portion of the preceding slab.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5275324A JP2856651B2 (en) | 1993-11-04 | 1993-11-04 | Exhaust heat recovery type scrubber and exhaust heat recovery method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5275324A JP2856651B2 (en) | 1993-11-04 | 1993-11-04 | Exhaust heat recovery type scrubber and exhaust heat recovery method |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH07127979A JPH07127979A (en) | 1995-05-19 |
JP2856651B2 true JP2856651B2 (en) | 1999-02-10 |
Family
ID=17553873
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP5275324A Expired - Lifetime JP2856651B2 (en) | 1993-11-04 | 1993-11-04 | Exhaust heat recovery type scrubber and exhaust heat recovery method |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2856651B2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP6214885B2 (en) * | 2012-03-09 | 2017-10-18 | メタウォーター株式会社 | Waste heat recovery system and waste heat recovery method |
-
1993
- 1993-11-04 JP JP5275324A patent/JP2856651B2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPH07127979A (en) | 1995-05-19 |
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