JPH10160143A - Method and apparatus for cooling wall surface of waste gas flow passage in refuse processing installation - Google Patents
Method and apparatus for cooling wall surface of waste gas flow passage in refuse processing installationInfo
- Publication number
- JPH10160143A JPH10160143A JP8312497A JP31249796A JPH10160143A JP H10160143 A JPH10160143 A JP H10160143A JP 8312497 A JP8312497 A JP 8312497A JP 31249796 A JP31249796 A JP 31249796A JP H10160143 A JPH10160143 A JP H10160143A
- Authority
- JP
- Japan
- Prior art keywords
- cooling water
- temperature
- exhaust gas
- cooling
- wall surface
- 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.)
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、プラズマ溶融炉，
バーナ溶融炉，アーク溶融炉などのごみ焼却灰の溶融炉
の排ガスダクトやごみ焼却炉の排ガス冷却器などにおけ
る排ガス流路の壁面の冷却方法と冷却装置とに関する。[0001] The present invention relates to a plasma melting furnace,
The present invention relates to a cooling method and a cooling device for a wall surface of an exhaust gas passage in an exhaust gas duct of an incineration ash melting furnace such as a burner melting furnace and an arc melting furnace and an exhaust gas cooler of a refuse incinerator.
【０００２】[0002]
【従来の技術】従来、例えば、ごみ焼却灰の溶融炉の排
ガスダクトやごみ焼却炉の排ガス冷却器などを流れる排
ガスは高濃度（数千ｐｐｍ）の塩酸（ＨＣｌ）や低融点
のダストなどを含んでおり、排ガスの温度は３００℃〜
１１００℃である。このような排ガスが上記排ガスダク
トや排ガス冷却器などの排ガス流路を流れると、これら
排ガス流路の壁面が高濃度の塩酸により腐食するため、
防食対策として、壁面を耐火材で覆っている。2. Description of the Related Art Conventionally, for example, exhaust gas flowing through an exhaust gas duct of a refuse incineration ash melting furnace or an exhaust gas cooler of a refuse incinerator contains high concentration (thousands of ppm) of hydrochloric acid (HCl) or low melting point dust. And the temperature of exhaust gas is 300 ℃ ~
1100 ° C. When such exhaust gas flows through exhaust gas channels such as the exhaust gas duct and exhaust gas cooler, the walls of these exhaust gas channels are corroded by high-concentration hydrochloric acid,
As a measure against corrosion, the walls are covered with fireproof material.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、上記の
ような防食対策では、防食効果はあるものの、耐火材の
表面が排ガスの温度近くまで昇温し、その結果、排ガス
に含まれる低融点ダストが融けて耐火材の表面に固着し
て成長し、排ガス流路が狭くなって閉塞してしまうとい
った問題があった。However, in the above-described anti-corrosion measures, although the anti-corrosion effect is obtained, the surface of the refractory material rises to near the temperature of the exhaust gas, and as a result, the low melting point dust contained in the exhaust gas is reduced. There has been a problem that it melts and adheres to the surface of the refractory material and grows, and the exhaust gas flow path becomes narrow and closed.
【０００４】上記のような低融点ダストの固着を防止す
るため、耐火材を用いる代わりに、排ガス流路の壁面の
裏側に冷却用通路を形成し、この冷却用通路に冷却水を
流して壁面を冷却することが行われた。しかしながら、
上記冷却水の温度が排ガスの酸露点温度よりも低い場合
には、排ガスに含まれる酸が結露して液滴になって壁面
に付着し、その結果、壁面の表面が塩酸を含んだ液滴に
より腐食されるといった別の問題が生じた。In order to prevent the low-melting-point dust from sticking as described above, instead of using a refractory material, a cooling passage is formed behind the wall surface of the exhaust gas passage, and cooling water is caused to flow through the cooling passage to cause the wall surface to cool. Cooling was done. However,
When the temperature of the cooling water is lower than the acid dew point temperature of the exhaust gas, the acid contained in the exhaust gas is condensed to form droplets and adhere to the wall surface. As a result, the surface of the wall surface contains a droplet containing hydrochloric acid. Another problem arises, such as corrosion.
【０００５】また、上記冷却水の温度がこの冷却水の沸
騰温度よりも高い場合、冷却用通路内で冷却水の一部が
水蒸気に変化し、これによって冷却水中の不純物が冷却
用通路内で濃縮されて堆積し、その結果、壁面が裏側
（すなわち冷却用通路側）から腐食されるといった問題
が生じた。When the temperature of the cooling water is higher than the boiling temperature of the cooling water, a part of the cooling water changes into steam in the cooling passage, whereby impurities in the cooling water are removed in the cooling passage. As a result, there is a problem that the wall surface is corroded from the back side (that is, the side of the cooling passage).
【０００６】そこで本発明は、排ガス中の低融点ダスト
が排ガス流路の壁面に固着するのを防止するとともに、
上記壁面の腐食を防止することを目的としたものであ
る。Accordingly, the present invention prevents the low melting point dust in the exhaust gas from sticking to the wall surface of the exhaust gas channel,
The purpose is to prevent corrosion of the wall surface.
【０００７】[0007]
【課題を解決するための手段】前述した目的を達成する
ために、本発明のうちで請求項１記載の発明は、ごみ処
理施設において、高濃度の塩酸と低融点のダストとを含
んだ３００℃〜１１００℃の排ガスが流れる排ガス流路
の壁面の冷却方法であって、上記排ガス流路の壁面を冷
却水で冷却し、この冷却水の温度を上記排ガスの酸露点
温度よりも高くかつ冷却水の沸騰温度よりも低い範囲に
設定したことを特徴としたものである。In order to achieve the above-mentioned object, the invention according to claim 1 of the present invention provides a waste disposal facility which contains a high concentration of hydrochloric acid and a low melting point dust in a waste treatment facility. A method of cooling a wall surface of an exhaust gas passage through which exhaust gas at a temperature of from 1 ° C. to 1100 ° C., wherein the wall surface of the exhaust gas passage is cooled with cooling water, and the temperature of the cooling water is higher than the acid dew point of the exhaust gas and the cooling is performed. It is characterized in that it is set in a range lower than the boiling temperature of water.
【０００８】これによると、排ガス流路の壁面が冷却水
により冷却されるため、排ガスに含まれる低融点ダスト
が壁面の表面に融けて固着するのを防止することができ
る。さらに、冷却水の温度を上記排ガスの酸露点温度よ
りも高くかつ冷却水の沸騰温度よりも低い範囲に設定し
たので、排ガスに含まれる酸は結露せず、このため、塩
酸を含んだ液滴が壁面の表面に付着するのを防止するこ
とができる。さらに、冷却水の一部が沸騰して水蒸気に
なるのを防止することができるため、冷却水中の不純物
が濃縮されて堆積するのを防止することができる。これ
により、排ガス流路の壁面の腐食も防止することができ
る。According to this, since the wall surface of the exhaust gas passage is cooled by the cooling water, it is possible to prevent the low melting point dust contained in the exhaust gas from melting and sticking to the surface of the wall surface. Further, since the temperature of the cooling water is set to a range higher than the acid dew point of the exhaust gas and lower than the boiling temperature of the cooling water, the acid contained in the exhaust gas does not condense, and therefore, the droplets containing hydrochloric acid. Can be prevented from adhering to the surface of the wall surface. Further, since it is possible to prevent a part of the cooling water from boiling and becoming steam, it is possible to prevent impurities in the cooling water from being concentrated and deposited. Thereby, corrosion of the wall surface of the exhaust gas passage can also be prevented.
【０００９】請求項２記載の発明は、冷却水の温度を５
０℃〜９０℃の範囲に設定したことを特徴としたもので
ある。請求項３記載の発明は、ごみ処理施設において、
高濃度の塩酸と低融点のダストとを含んだ３００℃〜１
１００℃の排ガスが流れる排ガス流路の壁面の冷却装置
であって、排ガス流路を形成する壁面の裏側に、冷却水
が流れる冷却用通路が形成され、冷却水タンク内の冷却
水を上記冷却用通路に供給する供給ラインと、冷却用通
路内の冷却水を冷却水タンク内へ回収する回収ライン
と、上記冷却水の温度を上記排ガスの酸露点温度よりも
高くかつ冷却水の沸騰温度よりも低い範囲に調節する温
度調節手段とが設けられていることを特徴としたもので
ある。According to a second aspect of the present invention, the temperature of the cooling water is set to 5
It is characterized in that it is set in the range of 0 ° C to 90 ° C. The invention according to claim 3 is a waste disposal facility,
300 ° C ~ 1 containing high concentration hydrochloric acid and low melting point dust
A cooling device for a wall surface of an exhaust gas passage through which exhaust gas of 100 ° C. flows, wherein a cooling passage through which cooling water flows is formed on the back side of the wall surface forming the exhaust gas passage, and the cooling water in the cooling water tank is cooled. A supply line for supplying the cooling water to the cooling water tank, and a recovery line for recovering the cooling water in the cooling passage into the cooling water tank, wherein the temperature of the cooling water is higher than the acid dew point temperature of the exhaust gas and the boiling temperature of the cooling water. And temperature control means for adjusting the temperature to a lower range.
【００１０】これによると、冷却水は、冷却水タンクか
ら供給ラインを通って冷却用通路に供給され、冷却用通
路を流れた後、回収ラインを通って冷却水タンクへ回収
される。これにより、排ガス流路の壁面が冷却水により
冷却されるため、排ガスに含まれる低融点ダストが壁面
の表面に融けて固着するのを防止することができる。According to this, the cooling water is supplied from the cooling water tank to the cooling passage through the supply line, flows through the cooling passage, and is recovered to the cooling water tank through the recovery line. Thereby, since the wall surface of the exhaust gas passage is cooled by the cooling water, it is possible to prevent the low melting point dust contained in the exhaust gas from melting and sticking to the surface of the wall surface.
【００１１】さらに、冷却水の温度は、温度調節手段に
よって、排ガスの酸露点温度よりも高くかつ冷却水の沸
騰温度よりも低い範囲に調節されているので、排ガスに
含まれる酸は結露せず、このため、塩酸を含んだ液滴が
壁面の表面に付着するのを防止することができる。さら
に、冷却用通路内で冷却水の一部が沸騰して水蒸気にな
るのを防止することができるため、冷却水中の不純物が
冷却用通路内で濃縮されて堆積するのを防止することが
できる。これにより、排ガス流路の壁面の表面からの腐
食と裏側（すなわち冷却用通路側）からの腐食を防止す
ることができる。Further, since the temperature of the cooling water is adjusted by the temperature adjusting means to a range higher than the acid dew point of the exhaust gas and lower than the boiling temperature of the cooling water, the acid contained in the exhaust gas does not condense. Therefore, it is possible to prevent the droplet containing hydrochloric acid from adhering to the surface of the wall surface. Further, since it is possible to prevent a part of the cooling water from boiling in the cooling passage to form steam, it is possible to prevent impurities in the cooling water from being concentrated and deposited in the cooling passage. . Thereby, corrosion from the surface of the wall surface of the exhaust gas passage and corrosion from the back side (that is, the cooling passage side) can be prevented.
【００１２】請求項４記載の発明は、温度調節手段は、
冷却水の温度を５０℃〜９０℃の範囲に調節することを
特徴としたものである。According to a fourth aspect of the present invention, the temperature control means includes:
It is characterized in that the temperature of the cooling water is adjusted in the range of 50C to 90C.
【００１３】[0013]
【発明の実施の形態】以下、本発明の実施の形態を図面
に基づいて説明する。図１に示すように、１はごみ焼却
炉やごみ焼却灰の溶融炉などのごみ処理施設に設けられ
る排ガスダクトであり、その内部には排ガス流路２が形
成されている。この排ガス流路２には、高濃度（数千ｐ
ｐｍ）の塩酸（ＨＣｌ）や低融点のダストなどを含んだ
３００℃〜１１００℃の排ガス３が流れている。Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, reference numeral 1 denotes an exhaust gas duct provided in a waste treatment facility such as a waste incinerator or a waste incineration ash melting furnace, in which an exhaust gas channel 2 is formed. The exhaust gas passage 2 has a high concentration (thousands of p).
pm) of hydrochloric acid (HCl), low melting point dust and the like.
【００１４】上記排ガスダクト１の壁体４の内側の壁面
４ａの裏側には、冷却水５が流れる冷却用通路６が形成
されている。また、上記排ガスダクト１の上流部には、
冷却水タンク７内の冷却水５を第１ポンプ８によって上
記冷却用通路６に供給する供給ライン９が接続されてい
る。さらに、上記排ガスダクト１の下流部には、冷却用
通路６内の冷却水５を冷却水タンク７内へ回収する回収
ライン１０が接続されている。A cooling passage 6 through which cooling water 5 flows is formed behind the wall surface 4a inside the wall body 4 of the exhaust gas duct 1. In the upstream part of the exhaust gas duct 1,
A supply line 9 for supplying the cooling water 5 in the cooling water tank 7 to the cooling passage 6 by a first pump 8 is connected. Further, a recovery line 10 for collecting the cooling water 5 in the cooling passage 6 into the cooling water tank 7 is connected to a downstream portion of the exhaust gas duct 1.
【００１５】上記冷却水５の温度は、温度調節手段１１
によって、排ガス３の酸露点温度よりも高くかつ冷却水
５の沸騰温度よりも低い範囲、すなわち５０℃〜９０℃
の範囲に調節されている。The temperature of the cooling water 5 is controlled by a temperature control means 11.
Range higher than the acid dew point temperature of the exhaust gas 3 and lower than the boiling temperature of the cooling water 5, that is, 50 ° C. to 90 ° C.
Has been adjusted to the range.
【００１６】上記温度調節手段１１は、上記冷却水タン
ク７からオーバーフローした冷却水５を貯める水槽１２
と、この水槽１２内の冷却水５を冷却塔１３へ送流する
第２ポンプ１４と、上記冷却塔１３で排ガス３の酸露点
温度よりも低温に冷却された冷却水５を上記供給ライン
９へ戻す戻しライン１５と、この戻しライン１５を流れ
る冷却水５の流量を調節する第１流量調節弁１６と、上
記供給ライン９を流れる冷却水５の流量を調節する第２
流量調節弁１７と、上記供給ライン９を流れる冷却水５
の温度に応じて第１流量調節弁１６を制御するとともに
上記回収ライン１０を流れる冷却水５の温度に応じて第
２流量調節弁１７を制御する制御装置１８とで構成され
ている。The temperature control means 11 comprises a water tank 12 for storing the cooling water 5 overflowing from the cooling water tank 7.
A second pump 14 for sending the cooling water 5 in the water tank 12 to the cooling tower 13, and a cooling water 5 cooled to a temperature lower than the acid dew point of the exhaust gas 3 in the cooling tower 13 to the supply line 9. Return line 15, a first flow control valve 16 for adjusting the flow rate of the cooling water 5 flowing through the return line 15, and a second flow rate adjusting valve 16 for adjusting the flow rate of the cooling water 5 flowing through the supply line 9.
The flow control valve 17 and the cooling water 5 flowing through the supply line 9
The controller 18 controls the first flow control valve 16 according to the temperature of the cooling water 5 and controls the second flow control valve 17 according to the temperature of the cooling water 5 flowing through the recovery line 10.
【００１７】上記第１流量調節弁１６と第２流量調節弁
１７とはそれぞれ電磁弁である。また、上記供給ライン
９を流れる冷却水５の温度は第１温度計１９で検出さ
れ、上記回収ライン１０を流れる冷却水５の温度は第２
温度計２０で検出され、制御装置１８はこれら第１温度
計１９と第２温度計２０との各温度検出値に基づいて第
１流量調節弁１６と第２流量調節弁１７とをそれぞれ開
閉する。The first flow control valve 16 and the second flow control valve 17 are solenoid valves. The temperature of the cooling water 5 flowing through the supply line 9 is detected by a first thermometer 19, and the temperature of the cooling water 5 flowing through the recovery line 10 is detected by a second thermometer 19.
The controller 18 opens and closes the first flow control valve 16 and the second flow control valve 17 based on the temperature detected by the first thermometer 19 and the second thermometer 20, respectively. .
【００１８】以下、上記構成における作用を説明する。
図２に示す排ガス３中の塩酸ガス濃度と酸露点温度との
グラフにおいて、例えば、排ガス３中の塩酸ガス濃度が
３０００ｐｐｍで排ガス３中の水分が１０ｖｏｌ％の場
合、酸露点温度は約５５℃である。これに対して、温度
調節手段１１によって、冷却水タンク７内の冷却水５と
回収ライン１０を流れる冷却水５との温度が８０℃に調
節され、戻しライン１５を流れる冷却水５の温度が冷却
塔１３で２０℃まで冷却され、供給ライン９を流れる冷
却水５の温度が６０℃に調節される。 冷却水５の流れ
は、第１ポンプ８が駆動することにより、冷却水５が、
冷却水タンク７から供給ライン９を通って冷却用通路６
に供給され、冷却用通路６を流れた後、回収ライン１０
を通って冷却水タンク７へ回収される。また、冷却水タ
ンク７からオーバーフローした冷却水５は、水槽１２か
ら第２ポンプ１４により冷却塔１３へ送流され、冷却塔
１３で冷却された後、戻しライン１５を通って上記供給
ライン９に戻される。The operation of the above configuration will be described below.
In the graph of the hydrochloric acid gas concentration in the exhaust gas 3 and the acid dew point temperature shown in FIG. 2, for example, when the hydrochloric acid gas concentration in the exhaust gas 3 is 3000 ppm and the moisture in the exhaust gas 3 is 10 vol%, the acid dew point temperature is about 55 ° C. It is. On the other hand, the temperature of the cooling water 5 in the cooling water tank 7 and the temperature of the cooling water 5 flowing through the recovery line 10 are adjusted to 80 ° C. by the temperature adjusting means 11, and the temperature of the cooling water 5 flowing through the return line 15 is adjusted. The cooling water is cooled to 20 ° C. in the cooling tower 13, and the temperature of the cooling water 5 flowing through the supply line 9 is adjusted to 60 ° C. When the first pump 8 is driven, the flow of the cooling water 5
Cooling passage 6 from cooling water tank 7 through supply line 9
After flowing through the cooling passage 6, the recovery line 10
Through the cooling water tank 7. The cooling water 5 overflowing from the cooling water tank 7 is sent from the water tank 12 to the cooling tower 13 by the second pump 14, is cooled by the cooling tower 13, passes through the return line 15, and returns to the supply line 9. Will be returned.
【００１９】これにより、壁面４ａが冷却水５により冷
却されるため、排ガス３に含まれる低融点ダストが壁面
４ａの表面に融けて固着するのを防止することができ
る。尚、この理由は、上記低融点ダストの融点が３００
℃以上であるのに対して、壁面４ａの表面温度が３００
℃に達しないため、低融点ダストは融けずに固体のまま
の状態であり、したがって、壁面４ａに固着することは
ない。As a result, since the wall surface 4a is cooled by the cooling water 5, it is possible to prevent the low melting point dust contained in the exhaust gas 3 from melting and sticking to the surface of the wall surface 4a. The reason is that the melting point of the low melting point dust is 300
° C or higher, whereas the surface temperature of the wall surface 4a is 300
Since the temperature does not reach ° C, the low melting point dust remains in a solid state without melting, and therefore does not adhere to the wall surface 4a.
【００２０】さらに、冷却用通路６内の冷却水５の温度
は、６０℃〜８０℃に調節され、上記排ガス３の酸露点
温度（約５５℃）よりも高くかつ冷却水５の沸騰温度
（１００℃）よりも低い範囲であるため、排ガス３に含
まれる酸は結露せず、したがって、塩酸を含んだ液滴が
壁面４ａの表面に付着するのを防止することができる。
さらに、冷却用通路６内で冷却水５の一部が沸騰して水
蒸気になるのを防止することができるため、冷却水５中
の不純物が冷却用通路６内で濃縮されて堆積するのを防
止することができる。これにより、排ガス流路２の壁面
４ａの表面からの腐食と裏側（すなわち冷却用通路６
側）からの腐食を防止することができる。尚、上記供給
ライン９を流れる冷却水５の温度が６０℃よりも低下し
た場合、この低下した冷却水５の温度は第１温度計１９
で検出され、これに基づいて、制御装置１８が第１流量
調節弁１６を絞って戻しライン１５から供給ライン９へ
戻される温度２０℃の冷却水５の量を減少させる。これ
により、供給ライン９を流れる冷却水５の温度が上昇し
て６０℃に保たれる。これとは逆に、供給ライン９を流
れる冷却水５の温度が６０℃よりも上昇した場合は、制
御装置１８が第１流量調節弁１６をさらに開いて戻しラ
イン１５から供給ライン９へ戻される温度２０℃の冷却
水５の量を増加させることにより、供給ライン９を流れ
る冷却水５の温度が低下して６０℃に保たれる。Further, the temperature of the cooling water 5 in the cooling passage 6 is adjusted to 60 ° C. to 80 ° C., which is higher than the acid dew point temperature of the exhaust gas 3 (about 55 ° C.) and the boiling temperature of the cooling water 5 (about 55 ° C.). (100 ° C.), the acid contained in the exhaust gas 3 is not condensed, so that the droplet containing hydrochloric acid can be prevented from adhering to the surface of the wall surface 4a.
Further, since it is possible to prevent a part of the cooling water 5 from boiling in the cooling passage 6 to form steam, it is possible to prevent impurities in the cooling water 5 from being concentrated and deposited in the cooling passage 6. Can be prevented. Thereby, corrosion from the surface of the wall surface 4a of the exhaust gas passage 2 and the back side (that is, the cooling passage 6)
Side) can be prevented. When the temperature of the cooling water 5 flowing through the supply line 9 is lower than 60 ° C., the temperature of the lowered cooling water 5 is measured by the first thermometer 19.
The controller 18 reduces the amount of the cooling water 5 having the temperature of 20 ° C. which is returned from the return line 15 to the supply line 9 by squeezing the first flow control valve 16. As a result, the temperature of the cooling water 5 flowing through the supply line 9 rises and is maintained at 60 ° C. Conversely, when the temperature of the cooling water 5 flowing through the supply line 9 rises above 60 ° C., the control device 18 further opens the first flow control valve 16 and returns from the return line 15 to the supply line 9. By increasing the amount of the cooling water 5 at a temperature of 20 ° C., the temperature of the cooling water 5 flowing through the supply line 9 is reduced and maintained at 60 ° C.
【００２１】また、回収ライン１０を流れる冷却水５の
温度が８０℃よりも上昇した場合、この上昇した冷却水
５の温度は第２温度計２０で検出され、これに基づい
て、制御装置１８が第２流量調節弁１７をさらに開いて
供給ライン９から冷却用通路６へ供給される温度６０℃
の冷却水５の量を増加させる。これにより、冷却用通路
６から回収ライン１０へ流れ込む冷却水５の温度が低下
して８０℃に保たれる。これとは逆に、回収ライン１０
を流れる冷却水５の温度が８０℃よりも低下した場合
は、制御装置１８が第２流量調節弁１７を絞って供給ラ
イン９から冷却用通路６へ供給される温度６０℃の冷却
水５の量を減少させることにより、冷却用通路６から回
収ライン１０へ流れ込む冷却水５の温度が上昇して８０
℃に保たれる。When the temperature of the cooling water 5 flowing through the recovery line 10 rises above 80 ° C., the temperature of the rising cooling water 5 is detected by the second thermometer 20 and, based on this, the controller 18 Opens the second flow control valve 17 further, and the temperature supplied from the supply line 9 to the cooling passage 6 is 60 ° C.
The amount of cooling water 5 is increased. As a result, the temperature of the cooling water 5 flowing from the cooling passage 6 to the recovery line 10 is reduced and maintained at 80 ° C. Conversely, the collection line 10
When the temperature of the cooling water 5 flowing through the cooling water falls below 80 ° C., the control device 18 throttles the second flow control valve 17 to supply the cooling water 5 having a temperature of 60 ° C. supplied from the supply line 9 to the cooling passage 6. By reducing the amount, the temperature of the cooling water 5 flowing from the cooling passage 6 to the recovery line 10 increases,
Kept at ° C.
【００２２】尚、上記実施の形態では一例として酸露点
温度が約５５℃の排ガス３を対象にしたため、冷却用通
路６に供給される冷却水５が６０℃になるように設定す
るとともに冷却用通路６から排出される冷却水５が８０
℃になるように設定しているが、ごみ焼却炉や灰溶融炉
で実際に発生する排ガス３の酸露点温度は４０℃〜８０
℃の範囲内であるため、この範囲の酸露点温度に応じ
て、上記冷却水５の温度範囲を５０℃〜９０℃とし、こ
の温度範囲から排ガス３の酸露点温度よりも高い最適な
冷却水５の温度を設定すればよい。In the above embodiment, since the exhaust gas 3 having an acid dew point of about 55 ° C. is used as an example, the cooling water 5 supplied to the cooling passage 6 is set to 60 ° C. The cooling water 5 discharged from the passage 6 is 80
° C, but the acid dew point temperature of the exhaust gas 3 actually generated in a refuse incinerator or ash melting furnace is 40 ° C to 80 ° C.
° C, the temperature range of the cooling water 5 is set to 50 ° C to 90 ° C according to the acid dew point temperature in this range, and the optimum cooling water higher than the acid dew point temperature of the exhaust gas 3 from this temperature range. 5 may be set.
【００２３】上記実施の形態では、排ガスダクト１内に
形成された排ガス流路２の壁面４ａを冷却水５で冷却し
ているが、排ガスダクト１に限らず、排ガス冷却器内に
形成された排ガス流路の壁面や空気予熱器内に形成され
た排ガス流路の壁面、あるいはその他の機器に形成され
た排ガス流路の壁面に対しても同様の効果が発揮され
る。In the above-described embodiment, the wall surface 4a of the exhaust gas passage 2 formed in the exhaust gas duct 1 is cooled by the cooling water 5. However, the present invention is not limited to the exhaust gas duct 1 and is formed in the exhaust gas cooler. The same effect is exerted on the wall surface of the exhaust gas channel, the wall surface of the exhaust gas channel formed in the air preheater, or the wall surface of the exhaust gas channel formed in other devices.
【００２４】上記実施の形態では、水槽１２から戻しラ
イン１５へ流れる冷却水５を冷却塔１３で冷却温度２０
℃まで冷却しているが、２０℃に限らず、供給ライン９
を流れる冷却水５の温度より低い冷却温度に冷却すれば
よい。In the above embodiment, the cooling water 5 flowing from the water tank 12 to the return line 15 is cooled by the cooling tower 13 at the cooling temperature 20.
℃, but not limited to 20 ℃, supply line 9
What is necessary is just to cool to the cooling temperature lower than the temperature of the cooling water 5 which flows through.
【００２５】[0025]
【発明の効果】以上説明したように、本発明によると、
排ガスに含まれる低融点ダストが排ガス流路の壁面の表
面に固着するのを防止することができるとともに、排ガ
ス流路の壁面の腐食も防止することができる。As described above, according to the present invention,
It is possible to prevent the low-melting-point dust contained in the exhaust gas from sticking to the surface of the wall surface of the exhaust gas channel, and to prevent corrosion of the wall surface of the exhaust gas channel.
【図１】本発明の実施の形態における冷却装置の構成図
である。FIG. 1 is a configuration diagram of a cooling device according to an embodiment of the present invention.
【図２】排ガスに含まれる塩酸ガスの濃度と酸露点温度
との関係を示すグラフである。FIG. 2 is a graph showing the relationship between the concentration of hydrochloric acid gas contained in exhaust gas and the acid dew point temperature.
２ 排ガス流路 ３ 排ガス ４ａ 壁面 ５ 冷却水 ６ 冷却用通路 ７ 冷却水タンク ９ 供給ライン １０ 回収ライン １１ 温度調節手段 2 Exhaust gas passage 3 Exhaust gas 4a Wall surface 5 Cooling water 6 Cooling passage 7 Cooling water tank 9 Supply line 10 Recovery line 11 Temperature control means
───────────────────────────────────────────────────── フロントページの続き (72)発明者 河野 正 大阪府大阪市此花区西九条５丁目３番28号 日立造船株式会社内 (72)発明者 乗冨 克哉 大阪府大阪市此花区西九条５丁目３番28号 日立造船株式会社内 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tadashi Kono 5-3-28 Nishikujo, Konohana-ku, Osaka-shi, Osaka Inside Hitachi Zosen Corporation (72) Inventor Katsuya Noritomi 5 Nishikujo, Konohana-ku, Osaka-shi, Osaka Chome 3-28 Hitachi Zosen Corporation
Claims (4)
低融点のダストとを含んだ３００℃〜１１００℃の排ガ
スが流れる排ガス流路の壁面の冷却方法であって、上記
排ガス流路の壁面を冷却水で冷却し、この冷却水の温度
を上記排ガスの酸露点温度よりも高くかつ冷却水の沸騰
温度よりも低い範囲に設定したことを特徴とするごみ処
理施設における排ガス流路の壁面の冷却方法。1. A method for cooling a wall surface of an exhaust gas passage in a refuse treatment facility through which exhaust gas at 300 ° C. to 1100 ° C. containing high concentration hydrochloric acid and low melting point dust flows, wherein the wall surface of the exhaust gas passage is Cooled with cooling water, the temperature of the cooling water is set to a range higher than the acid dew point temperature of the exhaust gas and lower than the boiling temperature of the cooling water, Cooling method.
設定したことを特徴とする請求項１記載のごみ処理施設
における排ガス流路の壁面の冷却方法。2. The method according to claim 1, wherein a temperature of the cooling water is set in a range of 50 ° C. to 90 ° C.
低融点のダストとを含んだ３００℃〜１１００℃の排ガ
スが流れる排ガス流路の壁面の冷却装置であって、排ガ
ス流路の壁面の裏側に、冷却水が流れる冷却用通路が形
成され、冷却水タンク内の冷却水を上記冷却用通路に供
給する供給ラインと、冷却用通路内の冷却水を冷却水タ
ンク内へ回収する回収ラインと、上記冷却水の温度を上
記排ガスの酸露点温度よりも高くかつ冷却水の沸騰温度
よりも低い範囲に調節する温度調節手段とが設けられて
いることを特徴とするごみ処理施設における排ガス流路
の壁面の冷却装置。3. A cooling device for a wall surface of an exhaust gas passage in which a waste gas of 300 ° C. to 1100 ° C. containing high concentration hydrochloric acid and low melting point dust flows in a waste treatment facility, On the back side, a cooling passage through which cooling water flows is formed, a supply line for supplying cooling water in the cooling water tank to the cooling passage, and a recovery line for collecting cooling water in the cooling passage into the cooling water tank. And a temperature adjusting means for adjusting the temperature of the cooling water to a range higher than the acid dew point of the exhaust gas and lower than the boiling temperature of the cooling water. Road wall cooling device.
〜９０℃の範囲に調節することを特徴とする請求項３記
載のごみ処理施設における排ガス流路の壁面の冷却装
置。4. The temperature control means sets the temperature of the cooling water to 50 ° C.
The cooling device for a wall surface of an exhaust gas passage in a refuse treatment facility according to claim 3, wherein the temperature is adjusted within a range of -90C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31249796A JP3380127B2 (en) | 1996-11-25 | 1996-11-25 | Cooling method and cooling device for wall of exhaust gas channel in waste treatment facility |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31249796A JP3380127B2 (en) | 1996-11-25 | 1996-11-25 | Cooling method and cooling device for wall of exhaust gas channel in waste treatment facility |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10160143A true JPH10160143A (en) | 1998-06-19 |
| JP3380127B2 JP3380127B2 (en) | 2003-02-24 |
Family
ID=18029936
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31249796A Expired - Lifetime JP3380127B2 (en) | 1996-11-25 | 1996-11-25 | Cooling method and cooling device for wall of exhaust gas channel in waste treatment facility |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3380127B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002531813A (en) * | 1998-12-01 | 2002-09-24 | ソシエテ ジェネラル プール レ テクニーク ヌーヴェル − エスジェエヌ | Method and apparatus for incinerating and vitrifying waste, especially radioactive waste |
| JP2010203647A (en) * | 2009-03-02 | 2010-09-16 | Nippon Steel Engineering Co Ltd | Exhaust heat recovery method and exhaust heat recovery system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5288262A (en) * | 1976-01-16 | 1977-07-23 | Takuma Kk | Method of oxidizing exhaust water from wet type exhaust smoke desulfurization apparatus under cooling |
| JPS6249116A (en) * | 1985-08-29 | 1987-03-03 | Idemitsu Petrochem Co Ltd | Controlling method for discharged gas of boiler |
| JPH058231U (en) * | 1991-07-12 | 1993-02-05 | 宇部興産株式会社 | Quencher for high temperature acid gas |
| JPH06265134A (en) * | 1993-03-11 | 1994-09-20 | Kansai Electric Power Co Inc:The | Apparatus and method for recovering value in plasma melting furnace |
-
1996
- 1996-11-25 JP JP31249796A patent/JP3380127B2/en not_active Expired - Lifetime
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5288262A (en) * | 1976-01-16 | 1977-07-23 | Takuma Kk | Method of oxidizing exhaust water from wet type exhaust smoke desulfurization apparatus under cooling |
| JPS6249116A (en) * | 1985-08-29 | 1987-03-03 | Idemitsu Petrochem Co Ltd | Controlling method for discharged gas of boiler |
| JPH058231U (en) * | 1991-07-12 | 1993-02-05 | 宇部興産株式会社 | Quencher for high temperature acid gas |
| JPH06265134A (en) * | 1993-03-11 | 1994-09-20 | Kansai Electric Power Co Inc:The | Apparatus and method for recovering value in plasma melting furnace |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002531813A (en) * | 1998-12-01 | 2002-09-24 | ソシエテ ジェネラル プール レ テクニーク ヌーヴェル − エスジェエヌ | Method and apparatus for incinerating and vitrifying waste, especially radioactive waste |
| JP2010203647A (en) * | 2009-03-02 | 2010-09-16 | Nippon Steel Engineering Co Ltd | Exhaust heat recovery method and exhaust heat recovery system |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3380127B2 (en) | 2003-02-24 |
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