JPS5918639B2 - How to clean a regenerative heat exchanger - Google Patents
How to clean a regenerative heat exchangerInfo
- Publication number
- JPS5918639B2 JPS5918639B2 JP51128028A JP12802876A JPS5918639B2 JP S5918639 B2 JPS5918639 B2 JP S5918639B2 JP 51128028 A JP51128028 A JP 51128028A JP 12802876 A JP12802876 A JP 12802876A JP S5918639 B2 JPS5918639 B2 JP S5918639B2
- Authority
- JP
- Japan
- Prior art keywords
- heat exchanger
- temperature
- low
- temperature layer
- layer element
- 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
Links
Landscapes
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
- Air Supply (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Description
【発明の詳細な説明】
本発明は排ガス中の窒素酸化物をアンモニアを用いて還
元する窒素酸化物除去方法にどいてフード回転型再生式
熱交換器で廃熱を回収する場合、該熱交換器の伝熱エレ
メント特に低温層伝熱エレメントに生成付着する硫安等
の灰塵を高温ガス（脱硝済み排ガス）入口温度を下げる
ことな（洗滌する方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention provides a nitrogen oxide removal method in which nitrogen oxides in exhaust gas are reduced using ammonia, and when waste heat is recovered using a hood rotation type regenerative heat exchanger, the heat exchanger The present invention relates to a method for cleaning ash dust such as ammonium sulfate that forms and adheres to the heat transfer element of a vessel, especially the low-temperature layer heat transfer element, without lowering the inlet temperature of the high-temperature gas (denitrated exhaust gas).
再生式熱交換器で廃熱を回収する場合に排ガス中に硫黄
酸比物（特に５０３）が存在するとこれが過剰のアンモ
ニア（ＮＨ３）と反応して硫酸アンモニウム（硫安）及
び／或は酸性硫酸アンモニウムが生成し熱交換器の低温
部に付着する。When waste heat is recovered using a regenerative heat exchanger, if sulfur acid compounds (especially 503) are present in the exhaust gas, this reacts with excess ammonia (NH3) to produce ammonium sulfate (ammonium sulfate) and/or acidic ammonium sulfate. and adheres to the low-temperature parts of the heat exchanger.
脱硝反応は２５０〜４００℃で行なわれるものであって
、反応器を出た排ガスの熱は運転費を安くするために回
収しなければならない。The denitrification reaction is carried out at 250 to 400°C, and the heat of the exhaust gas leaving the reactor must be recovered to reduce operating costs.
しかし排ガス中にＳＯ３とＮＨ３を含有すると温度降下
に伴いこれらの含有濃度に応じて硫安や酸性硫安が析出
し、これが蓄熱再生式熱交換器の伝熱エレメントに付着
してスケーリングをおこし、熱回収を困難にすると同時
にガスの圧力損失をも増大することになる。However, if SO3 and NH3 are contained in the exhaust gas, ammonium sulfate and acidic ammonium sulfate will precipitate depending on their concentration as the temperature drops, and this will adhere to the heat transfer element of the heat storage and regeneration type heat exchanger, causing scaling and causing heat recovery. At the same time, this increases the pressure loss of the gas.
例えば排ガス中に含まれるＳ０３が１０ ｐｐｍ 、Ｎ
Ｈ３が２０ｐｐｍ とすると約２３０℃で硫安が析出し
、この析出は避けることができない。For example, S03 contained in exhaust gas is 10 ppm, N
When H3 is 20 ppm, ammonium sulfate precipitates at about 230°C, and this precipitation cannot be avoided.
ところで竪型回転再生式熱交換器の場合高温の脱硝済み
排ガスはその上部から下部へ通され、又低温の未脱硝ガ
スは下部から上部へ通されるもので、伝熱エレメントの
低温端は熱交換器の下部にくる。By the way, in the case of a vertical rotary regenerative heat exchanger, high-temperature denitrified exhaust gas is passed from the upper part to the lower part, and low-temperature undenitrified gas is passed from the lower part to the upper part, and the low-temperature end of the heat transfer element is heated. It comes to the bottom of the exchanger.
したがって伝熱エレメント内での詰りは主として下部エ
レメント内に変生することになる。Therefore, clogging within the heat transfer element will mainly occur within the lower element.
又横型回転式の再生式熱交換器にあっては、高温ガスは
右側（又は左側）から左側（又は右側）へ、低温ガスは
左側（又は右側）から右側（又は左側）へ通されるもの
で、この場合伝熱エレメントの低温端は右、左側いずれ
か一方になり、伝熱エレメント内での詰りは低温層エレ
メント内に発生する。In addition, in horizontal rotary regenerative heat exchangers, high-temperature gas is passed from the right side (or left side) to the left side (or right side), and low-temperature gas is passed from the left side (or right side) to the right side (or left side). In this case, the low temperature end of the heat transfer element is either on the right or left side, and clogging in the heat transfer element occurs in the low temperature layer element.
このような熱交換器における洗滌方法として従来竪型Ｑ
場合は、熱交換器の上部に設けられた水洗用、スプレー
ノズルから洗滌水を降らせており、又横型の場合には水
洗用スプレーノズルを高温および低温端エレメント面の
近傍に設けて洗滌水を吹き付けるという手段が採られて
いた。The conventional cleaning method for such heat exchangers is the vertical type Q.
In the case of a horizontal type, the washing water is rained down from the washing and spray nozzles installed at the top of the heat exchanger, and in the case of a horizontal type, the washing water is sprayed by installing the washing spray nozzles near the high temperature and low temperature end element surfaces. The method used was spraying.
しかしこのような手段であれば、特に熱交換器の運転中
においてはその高温部が洗滌水によって急激に冷却され
るために機械的損傷を起すことば必至であり、したがっ
て運転中に水洗を行なう場合には高温ガス入口温度を水
洗可能温度まで降下させる必要があった。However, with this method, it is inevitable that mechanical damage will occur because the high-temperature parts of the heat exchanger are rapidly cooled down by the washing water, especially when the heat exchanger is in operation. It was necessary to lower the high temperature gas inlet temperature to a temperature that could be washed with water.
又装置の種類によっては運転中にロード変動を行ない高
温ガス入口温度を下げることのできないこともある。Also, depending on the type of equipment, the load may vary during operation, making it impossible to lower the high temperature gas inlet temperature.
本発明は上記のような不都合を排除することを目的とし
てなされたものである。The present invention has been made for the purpose of eliminating the above-mentioned disadvantages.
すなわち図面は本発明の一実施例を示したもので、図中
１は熱交換器本体、２，３は回転フードであり、この対
向する回転フード２，３間には高温層エレメント４、中
温層エレメント５、低温層エレメント６が設置されしか
も中温層エレメント５と低温層エレメント６間には所要
の間隔ａを設け、この間に洗滌水噴射ノズル７を低温層
エレメント６に向って配設している。That is, the drawing shows one embodiment of the present invention. In the drawing, 1 is a heat exchanger main body, 2 and 3 are rotating hoods, and between these opposing rotating hoods 2 and 3, there is a high temperature layer element 4 and a medium temperature layer element 4. A layer element 5 and a low temperature layer element 6 are installed, and a required interval a is provided between the medium temperature layer element 5 and the low temperature layer element 6, and a cleaning water injection nozzle 7 is disposed facing the low temperature layer element 6 between them. There is.
なお該ノズル７は第２図に示す如（低温層エレメント６
の各セクター毎に設け、洗浄水の噴射領域を前記回転フ
ード３内の高温ガス通路に正対する際の噴射ノズル毎に
順次行なわせる如く選択し得るように配慮されている。The nozzle 7 is arranged as shown in FIG.
The spray nozzle is provided for each sector of the rotary hood 3 so that the injection area of the cleaning water can be selected sequentially for each injection nozzle directly facing the high-temperature gas passage in the rotary hood 3.
なお第３図は回転フードの開口端の形状を示すものであ
る。Note that FIG. 3 shows the shape of the open end of the rotary hood.
以上の如く本発明にあっては、低温層エレメントに対し
て直接洗滌作用を及ぼすもので、この場合この低温層エ
レメントは水洗による急冷可能温度であることから従来
のような不都合は全（な（自由な水洗が可能であり、高
温ガス入口温度を下げることなく運転を続行し得るもの
であり、しかも低温ガス通路に対しては灰塵を流入させ
ることがないので、常に清浄な加熱ガスをボイラ等に供
給させることができるなど有効な熱回収が達成される。As described above, the present invention exerts a direct cleaning action on the low-temperature layer element, and in this case, the low-temperature layer element is at a temperature that can be rapidly cooled by washing with water, so the inconveniences of the conventional method are completely eliminated ( Free washing with water is possible, and operation can be continued without lowering the high-temperature gas inlet temperature.Furthermore, since no dust is allowed to flow into the low-temperature gas passage, clean heated gas can always be supplied to boilers, etc. Effective heat recovery is achieved.
第１図は本発明の一実施例を示す縦断正面図、第２図は
第１図におけるＡ−Ａ親図、第３図は回転フードの開口
端面図である。
１は熱交換器本体、２，３は回転フード、４は高温層エ
レメント、５は中温層エレメント、６は低温層エレメン
ト、７は洗滌水噴射ノズル。FIG. 1 is a longitudinal sectional front view showing one embodiment of the present invention, FIG. 2 is a parent view taken along the line A-A in FIG. 1, and FIG. 3 is an open end view of the rotary hood. 1 is a heat exchanger main body, 2 and 3 are rotary hoods, 4 is a high temperature layer element, 5 is a medium temperature layer element, 6 is a low temperature layer element, and 7 is a cleaning water injection nozzle.
Claims (1)
る窒素酸化物除去方法において、フード回転型再生式熱
交換器で廃熱を回収する場合、上下両回転フード間に介
装された中温層エレメントと低温層エレメントの間に、
該低温層エレメントの各セクターに対してそれぞれ外方
から中心に向って臨ませた複数本の噴射ノズルを各セク
ター毎に選択的に噴射させることにより、前記熱交換器
の運転を続けながらしかも高温ガス入口温度を下げるこ
となく低温層エレメントを洗滌することを特徴とする再
生式熱交換器の洗滌方法。1 In a nitrogen oxide removal method in which nitrogen oxides in exhaust gas are reduced using ammonia, when waste heat is recovered using a rotating hood type regenerative heat exchanger, a medium-temperature layer interposed between upper and lower rotating hoods is used. Between the element and the low temperature layer element,
By selectively injecting a plurality of injection nozzles facing each sector of the low-temperature layer element from the outside toward the center of each sector, the heat exchanger can continue to operate while still achieving a high temperature. A method for cleaning a regenerative heat exchanger characterized by cleaning a low temperature layer element without lowering the gas inlet temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP51128028A JPS5918639B2 (en) | 1976-10-25 | 1976-10-25 | How to clean a regenerative heat exchanger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP51128028A JPS5918639B2 (en) | 1976-10-25 | 1976-10-25 | How to clean a regenerative heat exchanger |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5353049A JPS5353049A (en) | 1978-05-15 |
| JPS5918639B2 true JPS5918639B2 (en) | 1984-04-28 |
Family
ID=14974701
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP51128028A Expired JPS5918639B2 (en) | 1976-10-25 | 1976-10-25 | How to clean a regenerative heat exchanger |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5918639B2 (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2766969A (en) * | 1952-04-05 | 1956-10-16 | Air Preheater | Inter-deck soot blower |
| JPS5314445A (en) * | 1976-07-26 | 1978-02-09 | Mitsubishi Chem Ind Ltd | Heat exchanger |
-
1976
- 1976-10-25 JP JP51128028A patent/JPS5918639B2/en not_active Expired
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2766969A (en) * | 1952-04-05 | 1956-10-16 | Air Preheater | Inter-deck soot blower |
| JPS5314445A (en) * | 1976-07-26 | 1978-02-09 | Mitsubishi Chem Ind Ltd | Heat exchanger |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5353049A (en) | 1978-05-15 |
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