JPH09236206A - Device for recovering waste heat - Google Patents
Device for recovering waste heatInfo
- Publication number
- JPH09236206A JPH09236206A JP8041839A JP4183996A JPH09236206A JP H09236206 A JPH09236206 A JP H09236206A JP 8041839 A JP8041839 A JP 8041839A JP 4183996 A JP4183996 A JP 4183996A JP H09236206 A JPH09236206 A JP H09236206A
- Authority
- JP
- Japan
- Prior art keywords
- water
- gas
- waste
- type
- waste 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.)
- Granted
Links
Landscapes
- Chimneys And Flues (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、燃焼排ガス冷却設
備における廃熱ボイラー設備後の腐食性ガスを含む低温
排ガスの熱回収装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat recovery system for low-temperature exhaust gas containing corrosive gas after waste heat boiler equipment in a combustion exhaust gas cooling equipment.
【０００２】[0002]
【従来の技術】ごみ処理施設の燃焼排ガス冷却設備にお
ける排熱回収装置は、高温の燃焼排ガスを冷却し蒸気を
発生させるための廃熱ボイラー、さらにその排ガスを冷
却し廃熱ボイラーへの給水を予熱するための節炭器より
なる。図２を用いて従来の実施例を説明すると、燃焼排
ガスは廃熱ボイラー（１）の入口で約８５０℃であり、
これが廃熱ボイラー（１）の仕切壁（１−１）上下部で
ガス流れが３回反転しながら冷却され約３００℃となり
排ガスは節炭器（２）へ上から流入し約２００℃に冷却
された後、節炭器下部に設置された、ろ過式集塵器
（５）の入口温度を調整する水噴射式ガス冷却塔（４）
へ導かれる。2. Description of the Related Art An exhaust heat recovery system in a flue gas cooling facility of a waste treatment facility is a waste heat boiler for cooling high temperature flue gas to generate steam, and further cooling the flue gas to supply water to the waste heat boiler. It consists of a economizer for preheating. Explaining the conventional example with reference to FIG. 2, the combustion exhaust gas is about 850 ° C. at the inlet of the waste heat boiler (1),
This is cooled to about 300 ° C by reversing the gas flow three times at the upper and lower parts of the partition wall (1-1) of the waste heat boiler (1), and the exhaust gas flows into the economizer (2) from above and is cooled to about 200 ° C. After that, the water injection type gas cooling tower (4) installed in the lower part of the economizer and adjusting the inlet temperature of the filtration type dust collector (5)
Be led to.
【０００３】一方、ボイラー用水は脱気器給水ポンプ
（６）により脱気器（７）に供給される。ここで蒸気だ
め（１０）からの蒸気を吹き込んで約１４０℃まで加熱
し、ボイラー用水中の溶存酸素を放出し、加熱脱気され
たボイラー用水はボイラー給水ポンプ（８）で昇圧され
節炭器（２）へ給水される。節炭器ではガス流れに対
し、図３に示す（１２）の向流式で熱交換を行い、給水
を予熱し廃熱ボイラー（１）へ給水される。廃熱ボイラ
ーで発生した蒸気は大半がタービンへ送気され、一部が
脱気器（７）の加熱蒸気として使用される。On the other hand, the boiler water is supplied to the deaerator (7) by the deaerator water supply pump (6). Here, the steam from the steam sump (10) is blown into the boiler to heat it up to about 140 ° C, releasing the dissolved oxygen in the boiler water, and the heated and degassed boiler water is boosted by the boiler feed pump (8) to save the coal. Water is supplied to (2). In the economizer, heat is exchanged with the gas flow by the countercurrent method of (12) shown in FIG. 3 to preheat the feed water and feed it to the waste heat boiler (1). Most of the steam generated in the waste heat boiler is sent to the turbine, and part of it is used as heating steam for the deaerator (7).
【０００４】[0004]
【発明が解決しようとする課題】従来のような方式では
次のような課題を抱えている。第一に、通常、節炭器
（２）への通水は器内で温水になるため下から上へと自
然な方向に流し、排ガスは上から下へと流す図３に示す
（１２）の向流型熱交換としているが、設置空間等の制
約から廃熱ボイラー（１）内でのガス流れの反転数が偶
数となり、節炭器への排ガスを下から流さざるを得ない
場合も出てくる。このような場合、節炭器での熱交換が
図３に示す（１３）の並流型熱交換となり節炭器内の水
は熱交換した分のΔｔ1 昇温するため、出口ガス温度と
接近し所定のガス温度まで下げられず、その結果、必要
な熱回収ができなくなることである。The conventional method has the following problems. First, normally, water flowing to the economizer (2) flows in a natural direction from the bottom to the top because it becomes warm water inside the container, and the exhaust gas flows from the top to the bottom (12). Although it is a counter-current type heat exchange, the number of gas flow reversals in the waste heat boiler (1) becomes an even number due to restrictions such as installation space, and in some cases the exhaust gas to the economizer must be forced to flow from below. Come out. In such a case, the heat exchange in the economizer becomes the parallel flow type heat exchange of (13) shown in FIG. 3, and the water in the economizer rises in temperature by Δt 1 corresponding to the heat exchange. It is approached and cannot be lowered to a predetermined gas temperature, and as a result, necessary heat recovery cannot be performed.
【０００５】第二に、上向きガス流れ式の水噴射式ガス
冷却塔（４）の下部がダクト（１１）のみで構成されて
いる場合、負荷によってはドレンが滴下しダストがダク
ト壁面に付着する心配がある。第三に、立ち上げ初期に
は節炭器内の水は常温であり、廃熱ボイラーから蒸気が
発生するまでの相当な時間は節炭器出口ガス温度が低
く、低温腐食防止上、後流のろ過式集塵機（５）への通
ガスは待機せざるを得ないことである。Secondly, when the lower part of the upward gas flow type water injection type gas cooling tower (4) is composed only of the duct (11), the drain drops depending on the load and the dust adheres to the wall surface of the duct. I'm worried. Third, the water in the economizer is at room temperature in the initial stage of startup, and the gas temperature at the exit of the economizer is low for a considerable time until steam is generated from the waste heat boiler. It is inevitable to wait for the gas to flow to the filtration type dust collector (5).
【０００６】[0006]
【課題を解決するための手段】燃焼排ガスを冷却し蒸気
を発生させる廃熱ボイラー設備と、その後流にろ過式集
塵機の入口温度を調整する上向きガス流れ式の水噴射式
ガス冷却塔を備えた燃焼排ガス冷却設備において、水噴
射式ガス冷却塔の下部に低圧蒸発冷却器を設け、これに
廃熱ボイラー給水用の脱気器器内水を循環させる水路を
形成したことを特徴とする排熱回収装置を提供するもの
である。[Means for Solving the Problems] A waste heat boiler facility for cooling combustion exhaust gas to generate steam, and an upward gas flow type water injection type gas cooling tower for adjusting the inlet temperature of a filtration type dust collector are provided in the subsequent stream. In the flue gas cooling equipment, a low-pressure evaporative cooler is provided below the water injection type gas cooling tower, and a water passage for circulating the water inside the deaerator for supplying the waste heat boiler is formed. A recovery device is provided.
【０００７】図１を用いて説明すると、節炭器（２）出
口で約２６０℃の排ガスは、低圧蒸発冷却器（３）での
熱交換によって約２００℃まで低下し、一方、脱気器
（７）からの循環水は約１４０℃の飽和水のものが一部
飽和蒸気となり脱気器へ導かれ、脱気器ではさらに従来
より少な目の蒸気を蒸気だめ（１０）から追加的に供給
して約１４０℃まで昇温する。Explaining with reference to FIG. 1, the exhaust gas of about 260 ° C. at the outlet of the economizer (2) is lowered to about 200 ° C. by heat exchange in the low pressure evaporative cooler (3), while the deaerator is The circulating water from (7) is part of saturated water of about 140 ° C that becomes saturated steam and is led to the deaerator. In the deaerator, a smaller amount of steam than before is additionally supplied from the steam sump (10). Then, the temperature is raised to about 140 ° C.
【０００８】すなわち、本発明の特色は図３の並流型熱
交換（１３）に示すように低圧蒸発冷却器出入口の水の
温度差がほとんどないことを利用して排ガスとの温度差
Δｔ 2 を高め、また、いずれの排ガス流れにも適用で
き、必要な低温の熱回収ができるという点である。ま
た、設備的にみても、小容量の循環水ポンプ（９）を設
けることにより脱気器器内水を循環させるだけで、制御
装置も必要なく容易に設備に適用でき運転取扱も簡単で
ある。That is, the feature of the present invention is that the parallel flow type heat of FIG.
As shown in the exchange (13), the water at the inlet and outlet of the low pressure evaporative cooler
Utilizing the fact that there is almost no temperature difference, the temperature difference with the exhaust gas
Δt TwoAnd can be applied to any exhaust gas flow.
It is possible to recover the required low temperature heat. Ma
In terms of equipment, a small capacity circulating water pump (9) was installed.
Control by simply circulating the water inside the deaerator by spilling
No equipment is required, it can be easily applied to equipment, and operation and handling is simple.
is there.
【０００９】[0009]
【発明の実施の形態】図１を基にして、本発明の実施例
について説明する。図にあって、（１）は廃熱ボイラー
で内部には仕切り壁（１−１）が設けられ、排ガスはボ
イラー内の下部及び上部で反転しながら熱交換部（ボイ
ラー）で熱交換し、その後段に設けられている節炭器
（２）にて排ガスは冷却、即ち、給水を予熱する如くな
している。次に、上記廃熱ボイラーはダクト（１１）を
介し、水噴射式ガス冷却塔（４）に接続され、ろ過式集
塵機（５）に導入される排ガス温度を調整する如くなし
ている。BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described with reference to FIG. In the figure, (1) is a waste heat boiler, inside of which a partition wall (1-1) is provided, and exhaust gas exchanges heat in a heat exchange section (boiler) while reversing in the lower and upper parts of the boiler, The exhaust gas is cooled by the economizer (2) provided in the subsequent stage, that is, the feed water is preheated. Next, the waste heat boiler is connected to the water injection type gas cooling tower (4) through the duct (11) so as to adjust the temperature of the exhaust gas introduced into the filtration type dust collector (5).
【００１０】今、本発明にあっては、前記水噴射式ガス
冷却塔（４）の下部のダクト（１１）内に低圧蒸発冷却
器（３）が設けられており、該低圧蒸発冷却器への給水
は、廃熱ボイラーへの給水とは独立させて、脱気器器内
水を脱気器循環水ポンプ（９）で循環供給し、ここで燃
焼排ガスの持つ廃熱を回収し、一部飽和蒸気の水として
脱気器（７）に戻すようになしている。In the present invention, a low pressure evaporative cooler (3) is provided in the lower duct (11) of the water injection type gas cooling tower (4). Independently from the water supply to the waste heat boiler, the water inside the deaerator is circulated and supplied by the deaerator circulating water pump (9), where the waste heat of the combustion exhaust gas is recovered and It is designed to be returned to the deaerator (7) as partially saturated steam water.
【００１１】このような構成になる本発明の排ガス及び
冷却水の流れを説明すると、燃焼排ガスは廃熱ボイラー
（１）の入口で約８５０℃であり、これが廃熱ボイラー
の仕切壁（１−１）上下部でガス流れが２回反転しなが
ら冷却され約３００℃となり、排ガスは後段の節炭器
（２）で約２６０℃に冷却された後上側に反転し、ろ過
式集塵機５の入口温度を調整する上向きガス流れ式の水
噴射式ガス冷却塔（４）の下部に設置された低圧蒸発冷
却器（３）へ導かれ、約２００℃に冷却される。Explaining the flow of the exhaust gas and the cooling water of the present invention having such a structure, the combustion exhaust gas is about 850 ° C. at the inlet of the waste heat boiler (1), which is the partition wall (1- 1) The upper and lower parts are cooled twice while reversing the gas flow to about 300 ° C, and the exhaust gas is cooled to about 260 ° C by the economizer (2) in the latter stage and then reversed to the upper side, and the inlet of the filtration dust collector 5 It is guided to a low pressure evaporative cooler (3) installed at the lower part of an upward gas flow type water injection type gas cooling tower (4) for adjusting the temperature and cooled to about 200 ° C.
【００１２】一方、ボイラー用水は脱気器給水ポンプ
（６）により脱気器（７）に供給される。ここで蒸気だ
め（１０）からの蒸気を吹き込んで約１４０℃まで加熱
し、ボイラー用水中の溶存酸素を放出し、加熱脱気され
たボイラー用水はボイラー給水ポンプ（８）で昇圧され
節炭器（２）へ給水される。節炭器で向流式の熱交換を
行い、給水を予熱し廃熱ボイラー（１）へ給水される。
廃熱ボイラーで発生した蒸気は大半がタービンヘ送気さ
れ、一部が脱気器の加熱蒸気として使用される。On the other hand, the boiler water is supplied to the deaerator (7) by the deaerator water supply pump (6). Here, the steam from the steam sump (10) is blown into the boiler to heat it up to about 140 ° C, releasing the dissolved oxygen in the boiler water, and the heated and degassed boiler water is boosted by the boiler feed pump (8) to save the coal. Water is supplied to (2). Countercurrent heat exchange is performed in the economizer to preheat the water supply and supply it to the waste heat boiler (1).
Most of the steam generated in the waste heat boiler is sent to the turbine, and part of it is used as heating steam for the deaerator.
【００１３】[0013]
【発明の効果】以上説明したように、本発明によれば次
の如き優れた効果を発揮する。 （１）ダクトでガス流れを反転させることなく、上向き
ガス流れに対する並流型熱交換で、必要な熱回収ができ
る。 （２）節炭器方式と比較して、ガスとの温度差が大きく
とれ伝熱面積が低減できる。 （３）上向流式の水噴射式ガス冷却塔の下部に低圧蒸発
冷却器を設けることによって、滴下ドレンを蒸発させる
ことができる。 （４）常時約１４０℃の脱気器器内水を循環できるた
め、立ち上げ時、後流のろ過式集塵機への通ガスを早め
ることができる。As described above, according to the present invention, the following excellent effects are exhibited. (1) Necessary heat recovery can be performed by parallel flow heat exchange with respect to the upward gas flow without inverting the gas flow in the duct. (2) Compared with the economizer system, the temperature difference with the gas is large and the heat transfer area can be reduced. (3) The dropping drain can be evaporated by providing a low pressure evaporative cooler in the lower part of the upward flow type water injection type gas cooling tower. (4) Since the water inside the deaerator at about 140 ° C can be circulated at all times, it is possible to speed up the flow of gas to the downstream filter dust collector at startup.
【図１】本発明装置を組み込んだ排熱回収装置の例を示
す図、FIG. 1 is a diagram showing an example of an exhaust heat recovery device incorporating the device of the present invention,
【図２】従来の排熱回収装置の例を示す図、FIG. 2 is a diagram showing an example of a conventional exhaust heat recovery device,
【図３】一般の熱交換型式を示す図である。FIG. 3 is a diagram showing a general heat exchange type.
1 廃熱ボイラー 2 節炭器 3 低圧蒸発冷却器 4 水噴射式ガス冷却塔 5 ろ過式集塵機 6 脱気器給水ポンプ 7 脱気器 8 ボイラー給水ポンプ 9 脱気器循環水ポンプ 1 0 蒸気だめ 1 1 ダクト 1 2 向流型熱交換 1 3 並流型熱交換 1 Waste heat boiler 2 Coal saver 3 Low pressure evaporative cooler 4 Water injection type gas cooling tower 5 Filtration type dust collector 6 Deaerator water supply pump 7 Deaerator 8 Boiler water supply pump 9 Deaerator circulating water pump 1 0 Steam reservoir 1 1 Duct 1 2 Countercurrent heat exchange 1 3 Cocurrent heat exchange
Claims (1)
熱ボイラー設備と、その後流にろ過式集塵機の入口温度
を調整する上向きガス流れ式の水噴射式ガス冷却塔を備
えた燃焼排ガス冷却設備において、水噴射式ガス冷却塔
の下部に低圧蒸発冷却器を設け、これに廃熱ボイラー給
水用の脱気器器内水を循環させる水路を形成したことを
特徴とする排熱回収装置。1. A flue gas cooling facility equipped with a waste heat boiler facility for cooling flue gas to generate steam and an upward gas flow type water injection type gas cooling tower for adjusting an inlet temperature of a filtration type dust collector in a downstream thereof. In the above, the exhaust heat recovery device is characterized in that a low-pressure evaporative cooler is provided in the lower part of the water injection type gas cooling tower, and a water channel for circulating the water inside the deaerator for supplying the waste heat boiler is formed therein.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04183996A JP3699520B2 (en) | 1996-02-28 | 1996-02-28 | Waste heat recovery device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04183996A JP3699520B2 (en) | 1996-02-28 | 1996-02-28 | Waste heat recovery device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09236206A true JPH09236206A (en) | 1997-09-09 |
| JP3699520B2 JP3699520B2 (en) | 2005-09-28 |
Family
ID=12619436
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP04183996A Expired - Fee Related JP3699520B2 (en) | 1996-02-28 | 1996-02-28 | Waste heat recovery device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3699520B2 (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57122923A (en) * | 1981-01-21 | 1982-07-31 | Miura Co Ltd | Waste heat recovery and desulfurization apparatus |
| JPS6073202A (en) * | 1983-09-30 | 1985-04-25 | 株式会社笹倉機械製作所 | Energy conserving deaerator |
| JPS6391407A (en) * | 1986-10-03 | 1988-04-22 | 三菱重工業株式会社 | Corrosion protection method of exhaust-gas boiler deaerator generating tube |
| JPH0933024A (en) * | 1995-07-14 | 1997-02-07 | Kubota Corp | Heat recovering method in exhaust gas treatment |
-
1996
- 1996-02-28 JP JP04183996A patent/JP3699520B2/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57122923A (en) * | 1981-01-21 | 1982-07-31 | Miura Co Ltd | Waste heat recovery and desulfurization apparatus |
| JPS6073202A (en) * | 1983-09-30 | 1985-04-25 | 株式会社笹倉機械製作所 | Energy conserving deaerator |
| JPS6391407A (en) * | 1986-10-03 | 1988-04-22 | 三菱重工業株式会社 | Corrosion protection method of exhaust-gas boiler deaerator generating tube |
| JPH0933024A (en) * | 1995-07-14 | 1997-02-07 | Kubota Corp | Heat recovering method in exhaust gas treatment |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3699520B2 (en) | 2005-09-28 |
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