JPH04104A - Method of preventing splashing of phosphorus in melting furnace - Google Patents
Method of preventing splashing of phosphorus in melting furnaceInfo
- Publication number
- JPH04104A JPH04104A JP10009490A JP10009490A JPH04104A JP H04104 A JPH04104 A JP H04104A JP 10009490 A JP10009490 A JP 10009490A JP 10009490 A JP10009490 A JP 10009490A JP H04104 A JPH04104 A JP H04104A
- Authority
- JP
- Japan
- Prior art keywords
- mud
- phosphorus
- slaked lime
- sludge
- melting furnace
- 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
- 238000002844 melting Methods 0.000 title claims abstract description 26
- 230000008018 melting Effects 0.000 title claims abstract description 26
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 title claims abstract description 16
- 239000011574 phosphorus Substances 0.000 title claims abstract description 16
- 229910052698 phosphorus Inorganic materials 0.000 title claims abstract description 16
- 238000000034 method Methods 0.000 title abstract description 7
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims abstract description 21
- 239000000920 calcium hydroxide Substances 0.000 claims abstract description 21
- 235000011116 calcium hydroxide Nutrition 0.000 claims abstract description 21
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims abstract description 21
- 238000001035 drying Methods 0.000 claims abstract description 11
- 239000010802 sludge Substances 0.000 claims description 40
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 abstract description 18
- 238000002485 combustion reaction Methods 0.000 abstract description 14
- 229910000147 aluminium phosphate Inorganic materials 0.000 abstract description 9
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 abstract description 9
- 239000002893 slag Substances 0.000 abstract description 9
- 239000001506 calcium phosphate Substances 0.000 abstract description 6
- 235000011010 calcium phosphates Nutrition 0.000 abstract description 6
- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 abstract description 6
- 229910000389 calcium phosphate Inorganic materials 0.000 abstract description 5
- 238000010309 melting process Methods 0.000 abstract description 5
- 238000006243 chemical reaction Methods 0.000 abstract description 4
- 235000008733 Citrus aurantifolia Nutrition 0.000 abstract description 2
- 235000011941 Tilia x europaea Nutrition 0.000 abstract description 2
- 239000004571 lime Substances 0.000 abstract description 2
- 239000000126 substance Substances 0.000 abstract description 2
- 238000007599 discharging Methods 0.000 abstract 2
- 230000008878 coupling Effects 0.000 abstract 1
- 238000010168 coupling process Methods 0.000 abstract 1
- 238000005859 coupling reaction Methods 0.000 abstract 1
- 239000011499 joint compound Substances 0.000 abstract 1
- 239000001226 triphosphate Substances 0.000 abstract 1
- 235000011178 triphosphate Nutrition 0.000 abstract 1
- UNXRWKVEANCORM-UHFFFAOYSA-N triphosphoric acid Chemical compound OP(O)(=O)OP(O)(=O)OP(O)(O)=O UNXRWKVEANCORM-UHFFFAOYSA-N 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 238000005260 corrosion Methods 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 5
- 239000010865 sewage Substances 0.000 description 5
- 229910019142 PO4 Inorganic materials 0.000 description 4
- 229920000642 polymer Polymers 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- 239000002918 waste heat Substances 0.000 description 4
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 2
- 239000010452 phosphate Substances 0.000 description 2
- 235000021317 phosphate Nutrition 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- 229910014480 Ca(HPO4) Inorganic materials 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 150000001447 alkali salts Chemical class 0.000 description 1
- 229910052925 anhydrite Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Landscapes
- Gasification And Melting Of Waste (AREA)
Abstract
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汚泥
に含有された燐が燃焼排ガスに飛散することを防止する
溶融炉における燐の飛散防止に関する。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to prevention of scattering of phosphorus in a melting furnace for melting septic tank sludge, which prevents phosphorus contained in sludge from scattering into combustion exhaust gas.
従来の技術
従来、溶融炉において下水処理施設から排出される浄化
槽汚泥を溶融処理する前工程としては、濃縮汚泥として
排出される浄化槽汚泥を脱水機において含水量を低減し
て脱水ケーキにした後に、脱水ケーキを乾燥機において
さらに含水量を低減して乾燥汚泥にしていた。そして、
乾燥汚泥を溶融炉において溶融処理し、スラグとして取
り出していた。Conventional technology Conventionally, as a preprocess for melting septic tank sludge discharged from a sewage treatment facility in a melting furnace, the septic tank sludge discharged as thickened sludge is reduced in water content in a dehydrator and turned into a dehydrated cake. The water content of the dehydrated cake was further reduced in a dryer to form dried sludge. and,
Dried sludge was melted in a melting furnace and extracted as slag.
また、凝集剤としてポリマーを添加して脱水した汚泥は
、５ｉｎ２に比してＣａＯが少なく塩基度（ＣａＯ／５
ｉ０２）が低い。しかし、溶融処理に適した汚泥は塩基
度が１ （ＣａＯ／５ｉＯ３＝１）前後のものであり、
汚泥が融点が低（溶融処理が容易である。このために従
来は、ポリマーを添加した汚泥を乾燥して得られる乾燥
汚泥にＣａ（ＯＨ）２を添加して塩基度を１に調整して
いた。In addition, sludge dehydrated by adding polymer as a flocculant has less CaO and basicity (CaO/5
i02) is low. However, sludge suitable for melt treatment has a basicity of around 1 (CaO/5iO3=1);
Sludge has a low melting point (melting process is easy. For this reason, conventionally, Ca(OH)2 is added to the dried sludge obtained by drying sludge with added polymer to adjust the basicity to 1. Ta.
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
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ＰＩＩＡ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ユ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−ジョン）を起こす問題があり、燃
焼排ガスの温度が６００°Ｃ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、（
例えばに３ＰＯ４，に２ＨＰＯ４，Ｚｎ（ＰＯ４）ｎ・
■２０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ＳＯ□、ＳＯ３，ＨＣＩを
吸収してアルカリ塩付着物など共に、ホットコロ−ジョ
ンを発生する問題があった。Problems to be Solved by the Invention However, the influent sewage that flows into sewage treatment facilities contains about 1 to 3% phosphorus (P) on a dry basis, and the P and P2O5 contained in dried sludge are Furnace temperature is 1000
If the concentration is exceeded, it will scatter into the combustion exhaust gas and dissolve in the waste water of the exhaust gas treatment tower that wet-processes the combustion exhaust gas. 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 in that P is concentrated in the water treatment system and the PIIA degree in the sludge increases year by year. In addition, P in the combustion exhaust gas
When the temperature drops, it changes from a fume state to a solid state and adheres to the pipe walls of waste heat recovery equipment and exhaust gas treatment towers, causing corrosion due to phosphoric acid. It becomes particularly severe when the temperature is below C. In addition, many P compounds are highly hygroscopic, (
For example, 3PO4, 2HPO4, Zn(PO4)n・
■20, etc.) The surface becomes wet due to the moisture in the combustion exhaust gas, and there is a problem that it absorbs SO□, SO3, and HCI in the combustion exhaust gas, and generates hot corrosion along with alkali salt deposits. Ta.
本発明は、凝集剤としてＣａ（ＯＨ）２を添加して脱水
した汚泥においてはスラグに対するＰの移行率が４０〜
６０％となり、移行率が２０％前後となるポリマーを使
用した汚泥に較べて燃焼排ガスによる腐食トラブルが特
に発生しないことに着目したものであり、塩基度の調整
に使用するＣａ（Ｏｌｌ）２とＰの反応もしくは結合に
より燃焼排ガスに対するＰの飛散を防止してＰをスラグ
に固定することができる溶融炉における燐の飛散防止方
法を提供することを目的とする。The present invention shows that in sludge dehydrated by adding Ca(OH)2 as a flocculant, the transfer rate of P to slag is 40~
This method focuses on the fact that corrosion problems due to combustion exhaust gas do not occur compared to sludge using polymers, which has a transfer rate of around 20%. It is an object of the present invention to provide a method for preventing scattering of phosphorus in a melting furnace, which is capable of fixing P to slag by preventing scattering of P in combustion exhaust gas through reaction or bonding of P.
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、乾燥工程前の十分
な水分を含む汚泥に消石灰を添加し、この後に乾燥工程
において汚泥を乾燥させ、乾燥された乾燥汚泥を溶融炉
において溶融処理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 adds slaked lime to sludge containing sufficient moisture before the drying process, then dries the sludge in the drying process, and then processes the dried sludge. The structure is such that the melting process is performed in a melting furnace.
作用
上記した構成により、汚泥の十分な水分中に消石灰が溶
解し、汚泥に含まれた燐および燐酸と消石灰が反応して
燐酸三石灰等の種々の燐酸カルシュラムが生成される。Operation With the above-described structure, slaked lime is dissolved in sufficient moisture of the sludge, and the phosphorus and phosphoric acid contained in the sludge react with the slaked lime to produce various calcium phosphates such as trilime phosphate.
また、汚泥中の硫黄分と消石灰の反応によって硫酸カル
シュラムが生成される。そして、燐酸カルシュラムおよ
び硫酸カルシュラムは融点が高いので、乾燥工程および
溶融炉における溶融処理において飛散により燃焼排ガス
中に移行することなくスラグ中に固定されて排出される
。In addition, calcilum sulfate is produced by the reaction between the sulfur content in the sludge and slaked lime. Since calcium phosphate and calcium sulfate have high melting points, they are fixed in the slag and discharged without being dispersed into the combustion exhaust gas during the drying process and the melting process in the melting furnace.
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、下水処理施設から排出されて含水率が９０
〜９５％である濃縮汚泥１に対して消石灰２ （Ｃａ（
ＯＨ）２）を添加し、この濃縮汚泥１を脱水機３におい
て含水率７０〜８５％に脱水して脱水ケーキ４を形成す
る。そして、脱水ケーキ４に消石灰２を再び添加し、こ
の脱水ケーキ４を乾燥機５において含水率Ｏ〜３０％に
乾燥させて乾燥汚泥６を形成する。この消石灰２は汚泥
の塩基度を調整するために、従来は乾燥汚泥６に添加さ
れていたものである。また、前述した工程において、消
石灰２の添加は濃縮汚泥１もしくは脱水ケーキ４のどち
らか一方に対して添加しても良い。EXAMPLE An example of the present invention will be described below based on the drawings. 1st
In the figure, water content is 90% after being discharged from a sewage treatment facility.
2 slaked lime (Ca(
OH)2) is added, and the concentrated sludge 1 is dehydrated in a dehydrator 3 to a water content of 70 to 85% to form a dehydrated cake 4. Then, slaked lime 2 is added again to the dehydrated cake 4, and the dehydrated cake 4 is dried in the dryer 5 to a moisture content of 0 to 30% to form a dried sludge 6. This slaked lime 2 has conventionally been added to dried sludge 6 in order to adjust the basicity of the sludge. Furthermore, in the above-described process, slaked lime 2 may be added to either the concentrated sludge 1 or the dehydrated cake 4.
そして、乾燥汚泥６は溶融炉７において溶融してスラグ
８となし、溶融炉７における燃焼排ガス９は廃熱回収装
置ｌＯおよび排ガス処理塔１１において処理する。The dried sludge 6 is then melted into slag 8 in the melting furnace 7, and the combustion exhaust gas 9 in the melting furnace 7 is treated in the waste heat recovery device IO and the exhaust gas treatment tower 11.
以下、上記構成における作用を説明する。濃縮汚泥１お
よび脱水ケーキ４などの十分な水分を含む汚泥中に添加
された消石灰２は、水分中に溶解第１表
して汚泥に含まれた燐および燐酸と反応し、（ａ（ＰＯ
４）２＋ＣａＰ２０７＋Ｃａ（ＨＰＯ４）２等の種々の
燐酸力ルシュウムを生成する。また、汚泥中の硫黄分Ｓ
とＣａ（ＯＨ）２の反応によって硫酸カルシュラム（Ｃ
ａＳＯ４）が生成される。The operation of the above configuration will be explained below. Slaked lime 2 added to sludge containing sufficient moisture such as thickened sludge 1 and dehydrated cake 4 dissolves in the moisture and reacts with phosphorus and phosphoric acid contained in the sludge, resulting in (a(PO
4) Generate various types of phosphoric acid such as 2+CaP207+Ca(HPO4)2. In addition, the sulfur content S in sludge
Calcium sulfate (C
aSO4) is generated.
そして、燐酸カルシュラムおよび硫酸カルシュラムは燐
および燐酸よりも融点が高いので、乾燥機５および溶融
炉７において汚泥から飛散して排ガス中に移行せず、ス
ラグ８に固定されて排出される。因に、各物質の融点を
列記すると、Ｐ：約５９０℃、Ｐ２Ｏ５：約５８０℃、
Ｃａ５（ＰＯ４）ｔ ： １６７０℃、ＣａＰ２０７：
１２３０℃、ＣａＳＯ４： １４５０℃である。Since calcium phosphate and calcium sulfate have a higher melting point than phosphorus and phosphoric acid, they are not scattered from the sludge in the dryer 5 and the melting furnace 7 and transferred into the exhaust gas, but are fixed in the slag 8 and discharged. Incidentally, when the melting points of each substance are listed, P: about 590°C, P2O5: about 580°C,
Ca5(PO4)t: 1670°C, CaP207:
1230°C, CaSO4: 1450°C.
また、第１表は廃熱回収装置ＩＯにおける付着物の成分
を示すものであり、第１表から明らかなように、ポリマ
ー系に較べて石灰系の付着物に含まれるＰは少なく、か
つ水分も少ない。したがって、廃熱回収装置ＩＯおよび
排ガス処理塔１１における燐酸腐食が抑制されるととも
に、Ｐの吸湿性に起因する水分が少ないので燃焼排ガス
９中に含まれたＳＯ２，ＳＯ２，ＨＣＩの吸収が抑制さ
れ、ホットコロ−ジョンの発生が防止される。In addition, Table 1 shows the components of the deposits in the waste heat recovery equipment IO, and as is clear from Table 1, lime-based deposits contain less P than polymer-based deposits, and have a higher moisture content. There are also few. Therefore, phosphoric acid corrosion in the waste heat recovery device IO and the exhaust gas treatment tower 11 is suppressed, and since there is little moisture due to the hygroscopicity of P, absorption of SO2, SO2, and HCI contained in the combustion exhaust gas 9 is suppressed. , the occurrence of hot corrosion is prevented.
発明の効果
以上述べたように本発明によれば、汚泥の十分な水分中
に消石灰が溶解し、汚泥に含まれた燐および燐酸と消石
灰が反応して燐酸三石灰等の種々の融点が高い燐酸力ル
シュウムを生成することにより、乾燥工程および溶融炉
における溶融処理において燐が汚泥から飛散して燃焼排
ガス中に移行することを防止でき、燐をスラグ中に固定
して排出することができる。Effects of the Invention As described above, according to the present invention, slaked lime is dissolved in sufficient moisture of sludge, and the slaked lime reacts with the phosphorus and phosphoric acid contained in the sludge to produce various products with high melting points, such as trilime phosphate. By producing phosphoric acid, it is possible to prevent phosphorus from scattering from the sludge and transferring into the combustion exhaust gas during the drying process and the melting process in the melting furnace, and it is possible to fix the phosphorus in the slag and discharge it.
第１図は本発明の一実施例を示す全体構成図である。 １・・・濃縮汚泥、２・・・消石灰、 ５・・・乾燥機、７・・・溶融炉。 FIG. 1 is an overall configuration diagram showing an embodiment of the present invention. 1... Thickened sludge, 2... Slaked lime, 5... Dryer, 7... Melting furnace.
Claims (1)
し、この後に乾燥工程において汚泥を乾燥させ、乾燥さ
れた乾燥汚泥を溶融炉において溶融処理することを特徴
とする溶融炉における燐の飛散防止方法。1. Phosphorus removal in a melting furnace characterized by adding slaked lime to sludge containing sufficient moisture before the drying process, drying the sludge in the drying process after that, and melting the dried sludge in a melting furnace. How to prevent scattering.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2100094A JP2562222B2 (en) | 1990-04-16 | 1990-04-16 | Prevention method of phosphorus scattering in melting furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2100094A JP2562222B2 (en) | 1990-04-16 | 1990-04-16 | Prevention method of phosphorus scattering in melting furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04104A true JPH04104A (en) | 1992-01-06 |
| JP2562222B2 JP2562222B2 (en) | 1996-12-11 |
Family
ID=14264821
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2100094A Expired - Lifetime JP2562222B2 (en) | 1990-04-16 | 1990-04-16 | Prevention method of phosphorus scattering in melting furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2562222B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5351374A (en) * | 1992-02-07 | 1994-10-04 | Werner Nabulon | Method and an apparatus for the continuous crimping of thermoplastic threads |
| JP2006015173A (en) * | 2004-06-30 | 2006-01-19 | Kubota Corp | Sewage sludge melting method |
| JP2017176904A (en) * | 2016-03-28 | 2017-10-05 | 株式会社北▲りょう▼ | Sludge dewatering method and dewatering apparatus for sludge |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54104639A (en) * | 1978-02-01 | 1979-08-17 | Ebara Infilco Co Ltd | Treatment of sludge |
| JPS5543135A (en) * | 1978-09-21 | 1980-03-26 | Ebara Infilco Co Ltd | Method of treating sludge |
| JPS5912733A (en) * | 1982-07-13 | 1984-01-23 | Hitachi Zosen Corp | Removal of harmful gas in drying system of organic waste material |
| JPS612111A (en) * | 1984-06-14 | 1986-01-08 | Fujikura Ltd | Optical cable |
| JPS61271098A (en) * | 1985-05-27 | 1986-12-01 | Babcock Hitachi Kk | Incinerating method for waste water sludge |
-
1990
- 1990-04-16 JP JP2100094A patent/JP2562222B2/en not_active Expired - Lifetime
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54104639A (en) * | 1978-02-01 | 1979-08-17 | Ebara Infilco Co Ltd | Treatment of sludge |
| JPS5543135A (en) * | 1978-09-21 | 1980-03-26 | Ebara Infilco Co Ltd | Method of treating sludge |
| JPS5912733A (en) * | 1982-07-13 | 1984-01-23 | Hitachi Zosen Corp | Removal of harmful gas in drying system of organic waste material |
| JPS612111A (en) * | 1984-06-14 | 1986-01-08 | Fujikura Ltd | Optical cable |
| JPS61271098A (en) * | 1985-05-27 | 1986-12-01 | Babcock Hitachi Kk | Incinerating method for waste water sludge |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5351374A (en) * | 1992-02-07 | 1994-10-04 | Werner Nabulon | Method and an apparatus for the continuous crimping of thermoplastic threads |
| JP2006015173A (en) * | 2004-06-30 | 2006-01-19 | Kubota Corp | Sewage sludge melting method |
| JP4514529B2 (en) * | 2004-06-30 | 2010-07-28 | 株式会社クボタ | Sewage sludge melting treatment method |
| JP2017176904A (en) * | 2016-03-28 | 2017-10-05 | 株式会社北▲りょう▼ | Sludge dewatering method and dewatering apparatus for sludge |
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| JP2562222B2 (en) | 1996-12-11 |
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