JP2636947B2 - Corrosion prevention method in combustion exhaust gas treatment equipment of melting furnace - Google Patents
Corrosion prevention method in combustion exhaust gas treatment equipment of melting furnaceInfo
- Publication number
- JP2636947B2 JP2636947B2 JP2107993A JP10799390A JP2636947B2 JP 2636947 B2 JP2636947 B2 JP 2636947B2 JP 2107993 A JP2107993 A JP 2107993A JP 10799390 A JP10799390 A JP 10799390A JP 2636947 B2 JP2636947 B2 JP 2636947B2
- Authority
- JP
- Japan
- Prior art keywords
- exhaust gas
- combustion exhaust
- melting furnace
- gas treatment
- flue
- 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
- Chimneys And Flues (AREA)
- Treating Waste Gases (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 本発明は浄化槽汚泥などを溶融する溶融炉において燃
焼排ガス中に飛散した燐や硫黄などの酸性物質を中和す
る溶融炉の燃焼排ガス処理装置における腐食防止方法に
関する。Description: TECHNICAL FIELD The present invention relates to corrosion in a flue gas treatment apparatus of a melting furnace for neutralizing acidic substances such as phosphorus and sulfur scattered in the flue gas in a melting furnace for melting septic tank sludge and the like. Prevention methods.
従来の技術 従来、下水処理施設から排出される浄化槽汚泥などの
汚泥は乾燥機において乾燥された後に、溶融炉において
溶融処理されてスラグとして取り出しされていた。そし
て溶融炉において生じる燃焼排ガスは排ガス処理装置で
ある廃熱回収装置や廃ガス処理塔において処理されてい
た。2. Description of the Related Art Conventionally, sludge such as septic tank sludge discharged from a sewage treatment plant has been dried in a dryer and then melted in a melting furnace and taken out as slag. The combustion exhaust gas generated in the melting furnace has been treated in a waste heat recovery device or a waste gas treatment tower which is an exhaust gas treatment device.
発明が解決しようとする課題 しかし、下水処理施設に流入する流入下水中にはドラ
イバベースで約１〜３％の燐（Ｐ）が含まれており、乾
燥汚泥中に含まれたＰおよびP2O5は炉内温度が1000度を
越えると燃焼排ガス中に飛散し、燃焼排ガスを湿式処理
する排ガス処理塔の排水中に溶解する。そして、排ガス
処理塔の排水は下水処理施設の水処理系に戻されるの
で、水処理系内でＰが濃縮されて汚泥中のＰ濃度が年々
増加する問題があった。また、燃焼排ガス中のＰは温度
が下がるとヒューム状態からソリッド状態へ移行して廃
熱回収装置や排ガス処理塔の管壁面に付着し、燐酸によ
る腐食（コロージョン）を起こす問題があり、燃焼排ガ
スの温度600℃以下となると特に激しくなる。また、Ｐ
の化合物は吸湿性の高い化合物が多く、（例えばK3PO4,
K2HPO4,Zn（PO4）ｎ・H2Oなど）燃焼排ガス中の湿分を
含んで表面が湿潤な状態となり、燃焼排ガス中のSO2,SO
3,HClを吸収してアルカリ塩付着物など共に、ホットコ
ロージョンを発生する問題があった。However, the influent sewage flowing into the sewage treatment plant contains about 1 to 3% of phosphorus (P) on a driver base, and P and P 2 contained in dry sludge are contained. When the temperature inside the furnace exceeds 1000 ° C., O 5 scatters in the flue gas and dissolves in the waste water of the flue gas treatment tower for wet-treating the flue gas. Then, since the wastewater from the exhaust gas treatment tower is returned to the water treatment system of the sewage treatment facility, there is a problem that P is concentrated in the water treatment system and the P concentration in the sludge increases year by year. Further, P in the combustion exhaust gas has a problem that when the temperature decreases, the P transitions from the fume state to the solid state and adheres to the pipe wall surface of the waste heat recovery device or the exhaust gas treatment tower, causing corrosion by phosphoric acid (corrosion). When the temperature is below 600 ° C., it becomes particularly severe. Also, P
Many compounds have high hygroscopicity, such as K 3 PO 4 ,
K 2 HPO 4 , Zn (PO 4 ) n ・ H 2 O, etc.) The surface becomes moist due to the moisture contained in the flue gas, and the SO 2 , SO
3. There is a problem that hot corrosion is caused by the absorption of HCl and the attachment of alkali salts.
本発明は、廃熱回収装置および排ガス処理塔における
腐食を防止するこができる溶融炉の燃焼排ガス処理装置
の腐食防止方法を提供することを目的とする。An object of the present invention is to provide a method for preventing corrosion of a combustion exhaust gas treatment device of a melting furnace, which can prevent corrosion in a waste heat recovery device and an exhaust gas treatment tower.
課題を解決するための手段 上記課題を解決するために本発明は、溶融炉から排出
された燐成分を含む燃焼排ガスを煙道を通して燃焼排ガ
ス処理装置に導くとともに、煙道の途中において水分を
供給せずに、燃焼排ガス中に固相粉末状の石灰剤を間欠
に乾式で噴霧する構成としたものである。Means for Solving the Problems In order to solve the above problems, the present invention introduces a flue gas containing a phosphorus component discharged from a melting furnace to a flue gas treatment device through a flue and supplies moisture in the middle of the flue. Instead of this, the solid-phase powdered lime agent is intermittently sprayed into the combustion exhaust gas in a dry manner.
作用 上記した構成により、溶融炉から排出される燃焼排ガ
ス中には乾燥汚泥中に含まれたＰおよびP2O5が飛散して
おり、燃焼排ガスとともに煙道を通って燃焼排ガス処理
装置に送られたＰおよびP2O5は温度が下がるとヒューム
状態からソリッド状態へ移行して燃焼排ガス処理装置の
壁面に付着する。また、Ｐの化合物、例えばK3PO4,K2HP
O4,Zn（PO4）ｎ・H2Oなどは吸湿性が高いので燃焼排ガ
ス中の湿分を含んで表面が湿潤な状態となる。Operation With the above-described configuration, the P and P 2 O 5 contained in the dried sludge are scattered in the flue gas discharged from the melting furnace and sent to the flue gas treatment device through the flue together with the flue gas. When the temperature decreases, the obtained P and P 2 O 5 shift from the fume state to the solid state and adhere to the wall surface of the flue gas treatment device. Compounds of P, for example, K 3 PO 4 , K 2 HP
O 4 , Zn (PO 4 ) n · H 2 O, and the like have high hygroscopicity, so that the surface becomes wet with the moisture contained in the combustion exhaust gas.
そして、湿潤な状態の付着物の表面には、煙道の途中
において噴霧された石灰剤（消石灰もしくは生石灰）が
燃焼排ガス中のP,P2O5とともに吸着され、ＰおよびP2P5
と消石灰もしくは生石灰が反応して燐酸三石灰等の種々
の燐酸カルシュウムを生成する。また、燃焼排ガス中の
SO2と消石灰もしくは生石灰の反応によって硫酸カルシ
ュウムが生成され、さらに燃焼排ガス中のHClと消石灰
および生石灰の反応によって塩化カルシュウムが生成さ
れる。したがって、燃焼排ガス中のP,P2O5,SO2,HClなど
を消石灰もしくは生石灰との反応により燐酸カルシュウ
ム、硫酸カルシュウムおよび塩化カルシュウムとして付
着物中に吸着することができ、燃焼排ガス処理装置の壁
面における付着物のpHを高めて腐食を防止することがで
きる。Then, on the surface of the deposits in a wet state, a lime agent (slaked lime or quick lime) sprayed in the middle of the flue is adsorbed together with P and P 2 O 5 in the combustion exhaust gas, and P and P 2 P 5
Reacts with slaked lime or quick lime to produce various calcium phosphates such as trilime phosphate. Also, in the combustion exhaust gas
Calcium sulfate is generated by the reaction between SO 2 and slaked lime or quick lime, and calcium chloride is generated by the reaction between HCl in the combustion exhaust gas and slaked lime or quick lime. Therefore, P, P 2 O 5 , SO 2 , HCl and the like in the combustion exhaust gas can be adsorbed in the deposit as calcium phosphate, calcium sulfate and calcium chloride by reaction with slaked lime or quick lime, and the flue gas treatment device Corrosion can be prevented by increasing the pH of the deposit on the wall surface.
実施例 以下本発明の一実施例を図面に基づいて説明する。第
１図において、乾燥汚泥１を溶融炉２で溶融処理してス
ラグ３を形成し、溶融炉２における燃焼排ガス４を煙道
５を通して燃焼排ガス処理装置である廃熱回収装置６お
よび排ガス処理塔７に供給する。そして、煙道５の途中
において燃焼排ガス４に対し、消石灰Ca（OH）2,生石灰
CaOなどの石灰剤８を間欠に乾式で噴霧する。An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, a dried sludge 1 is melted in a melting furnace 2 to form a slag 3, and a combustion exhaust gas 4 in the melting furnace 2 is passed through a flue 5 to a waste heat recovery device 6 as a combustion exhaust gas treatment device and an exhaust gas treatment tower. 7 In the middle of the flue 5, slaked lime Ca (OH) 2 , quicklime
A calcifying agent 8 such as CaO is intermittently sprayed in a dry manner.
以下、上記構成における作用を説明する。溶融炉２か
ら排出される燃焼排ガス４には乾燥汚泥１に含まれたＰ
およびP2O5が飛散しており、燃焼排ガス４とともに煙道
５を通って廃熱回収装置６および排ガス処理塔７に送ら
れたＰおよびP2O5は、第２図に示すように、温度が下が
るとヒューム状態からソリッド状態へ移行して廃熱回収
装置６および排ガス処理塔７の壁面に付着する。また、
Ｐの化合物、例えばK3PO4,K2HPO4,Zn（PO4）ｎ・H2Oな
どは吸湿性が高いので燃焼排ガス４の湿分を含んで表面
が湿潤な状態となる。そして、湿潤な状態の付着物９の
表面には、煙道の途中において噴霧された石灰剤８（消
石灰もしくは生石灰）が燃焼排ガス４のP,P2O5とともに
吸着され、ＰおよびP2O5とCa（OH）２もしくはCaOが反
応して燐酸三石灰等の種々の燐酸カルシウムを生成す
る。また、燃焼排ガス４のSO2とCa（OH）２もしくはCaO
の反応によって硫酸カルシュウムが生成され、さらに燃
焼排ガス４のHClとCa（OH）２およびCaOの反応によって
塩化カルシュウムが生成される。したがって、燃焼排ガ
ス４のP,P2O5,SO2,HClなどがCa（OH）２もしくはCaOと
の反応により燐酸カルシュウム、硫酸カルシュウムおよ
び塩化カルシュウムとして付着物９に吸着され、廃熱回
収装置６および排ガス処理塔７の壁面における付着物９
のpHが高められて腐食が防止される。また、付着物９は
燐酸カルシュウム、硫酸カルシュウムおよび塩化カルシ
ュウムを吸着することによって吸湿性が抑制され、乾燥
した状態となる。このため、従来はアルカリ溶液の高圧
噴射によって行っていた付着物９の洗浄をスクレーパに
よって容易に掻き落とすことができる。また、石灰剤８
は間欠的に噴霧するので使用量の低減を図ることができ
る。Hereinafter, the operation of the above configuration will be described. The combustion exhaust gas 4 discharged from the melting furnace 2 contains P contained in the dry sludge 1.
And P 2 O 5 are scattered, P and P 2 O 5 was sent to a waste heat recovery device 6 and the exhaust gas treating tower 7 through a flue 5 with flue gas 4, as shown in FIG. 2 When the temperature decreases, the state changes from the fume state to the solid state, and adheres to the wall surfaces of the waste heat recovery device 6 and the exhaust gas treatment tower 7. Also,
Compounds of P, for example, K 3 PO 4 , K 2 HPO 4 , Zn (PO 4 ) n · H 2 O, etc., have high hygroscopicity, so that the surface of the combustion exhaust gas 4 contains moisture and contains moisture. The lime agent 8 (slaked lime or quick lime) sprayed in the middle of the flue is adsorbed on the surface of the deposit 9 in a wet state together with P and P 2 O 5 of the combustion exhaust gas 4, and P and P 2 O 5 reacts with Ca (OH) 2 or CaO to produce various calcium phosphates such as trilime phosphate. Also, SO 2 and Ca (OH) 2 of the combustion exhaust gas 4 or CaO
, Calcium sulfate is generated by the reaction of HCl in the combustion exhaust gas 4 with Ca (OH) 2 and CaO. Therefore, P, P 2 O 5 , SO 2 , HCl and the like of the combustion exhaust gas 4 are adsorbed on the deposit 9 as calcium phosphate, calcium sulfate and calcium chloride by the reaction with Ca (OH) 2 or CaO, and the waste heat recovery device 6 and deposits 9 on the wall surface of the exhaust gas treatment tower 7
PH is increased to prevent corrosion. In addition, the adhering substance 9 absorbs calcium phosphate, calcium sulfate, and calcium chloride, thereby suppressing the hygroscopicity and becoming a dry state. For this reason, the cleaning of the deposit 9 conventionally performed by high-pressure injection of the alkaline solution can be easily scraped off by the scraper. In addition, lime 8
Is intermittently sprayed, so that the amount of use can be reduced.
発明の効果 以上述べたように本発明によれば、煙道の途中におい
て燃焼排ガスに石灰剤を噴霧することにより、湿潤な状
態の付着物の表面に燃焼排ガス中のP,P2O5,SO2,HClなど
を、石灰剤との反応生成物である燐酸カルシュウム，硫
酸カルシュウムおよび塩化カルシュウムとして付着物中
に吸着することができ、燃焼排ガス処理装置の壁面にお
ける付着物のpHを高めて腐食を防止することができる。Effects of the Invention As described above, according to the present invention, by spraying a lime agent on the flue gas in the middle of the flue, P, P 2 O 5 , SO 2, HCl and the like, phosphoric acid calcium is the reaction product of a lime agent, can be adsorbed on deposit in the sulfuric acid calcium, and calcium chloride, the corrosion increases the pH of the deposits on the wall surface of the combustion exhaust gas treatment apparatus Can be prevented.
第１図は本発明の一実施例を示す全体構成図、第２図は
廃熱回収装置６の壁面における作用を示す模式図であ
る。 １……乾燥汚泥、２……溶融炉、４……燃焼排ガス、８
……石灰剤、９……付着物。FIG. 1 is an overall configuration diagram showing one embodiment of the present invention, and FIG. 2 is a schematic diagram showing an operation on a wall surface of the waste heat recovery device 6. 1 ... dried sludge, 2 ... melting furnace, 4 ... combustion exhaust gas, 8
... lime, 9 ... deposits.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭58−51924（ＪＰ，Ａ) 特開 昭50−150675（ＪＰ，Ａ) 特開 昭61−287421（ＪＰ，Ａ) 特開 昭56−124425（ＪＰ，Ａ) ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-58-51924 (JP, A) JP-A-50-150675 (JP, A) JP-A-61-287421 (JP, A) JP-A-56-519 124425 (JP, A)
Claims (1)
ガスを煙道を通して燃焼排ガス処理装置に導くととも
に、煙道の途中において水分を供給せずに、燃焼排ガス
中に固相粉末状の石灰剤を間欠に乾式で噴霧することを
特徴とする溶融炉の燃焼排ガス処理装置における腐食防
止方法。1. A combustion flue gas containing a phosphorus component discharged from a melting furnace is guided to a flue gas treatment device through a flue, and a solid-phase powder is contained in the flue gas without supplying moisture in the middle of the flue. A method for preventing corrosion in a combustion exhaust gas treatment device of a melting furnace, wherein a lime agent is intermittently sprayed in a dry manner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2107993A JP2636947B2 (en) | 1990-04-24 | 1990-04-24 | Corrosion prevention method in combustion exhaust gas treatment equipment of melting furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2107993A JP2636947B2 (en) | 1990-04-24 | 1990-04-24 | Corrosion prevention method in combustion exhaust gas treatment equipment of melting furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH046312A JPH046312A (en) | 1992-01-10 |
| JP2636947B2 true JP2636947B2 (en) | 1997-08-06 |
Family
ID=14473264
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2107993A Expired - Lifetime JP2636947B2 (en) | 1990-04-24 | 1990-04-24 | Corrosion prevention method in combustion exhaust gas treatment equipment of melting furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2636947B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002333124A (en) * | 2001-03-09 | 2002-11-22 | Nippon Steel Corp | Method of inhibiting synthesis of dioxins and the like |
| US8800107B2 (en) | 2010-02-16 | 2014-08-12 | Irobot Corporation | Vacuum brush |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56124425A (en) * | 1980-03-07 | 1981-09-30 | Tokuyama Soda Co Ltd | Method for preventing corrosion of chimney |
-
1990
- 1990-04-24 JP JP2107993A patent/JP2636947B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH046312A (en) | 1992-01-10 |
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