FI75884C - Arrangements to improve the heating economy in rotary kilns - Google Patents
Arrangements to improve the heating economy in rotary kilns Download PDFInfo
- Publication number
- FI75884C FI75884C FI842335A FI842335A FI75884C FI 75884 C FI75884 C FI 75884C FI 842335 A FI842335 A FI 842335A FI 842335 A FI842335 A FI 842335A FI 75884 C FI75884 C FI 75884C
- Authority
- FI
- Finland
- Prior art keywords
- screens
- furnace
- arrangements
- arrangement according
- improve
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
- F27B7/14—Rotary-drum furnaces, i.e. horizontal or slightly inclined with means for agitating or moving the charge
- F27B7/16—Rotary-drum furnaces, i.e. horizontal or slightly inclined with means for agitating or moving the charge the means being fixed relatively to the drum, e.g. composite means
- F27B7/166—Rotary-drum furnaces, i.e. horizontal or slightly inclined with means for agitating or moving the charge the means being fixed relatively to the drum, e.g. composite means the means comprising chains
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
- F27B7/14—Rotary-drum furnaces, i.e. horizontal or slightly inclined with means for agitating or moving the charge
- F27B7/16—Rotary-drum furnaces, i.e. horizontal or slightly inclined with means for agitating or moving the charge the means being fixed relatively to the drum, e.g. composite means
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Treatment Of Sludge (AREA)
- Muffle Furnaces And Rotary Kilns (AREA)
- Incineration Of Waste (AREA)
- Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
- Constitution Of High-Frequency Heating (AREA)
- Ultra Sonic Daignosis Equipment (AREA)
- Drying Of Solid Materials (AREA)
Description
1 758841 75884
Arrangemang för att förbättra värmeekonomin i roterugnarArrangements to improve the heating economy in rotary kilns
Uppfinningen avser ett arrangemang för att förbättra värme-ekonomin vid drift av roterugnar, särskilt mesaförbränningsug-nar.The invention relates to an arrangement for improving the heat economy in the operation of rotary kilns, in particular mesa incinerators.
Uppfinningen kommer att beskrivas för fallet med ombränning av mesa men omfattar alla fall av godsbehandling i roterugn, som har gasströmnings- och materialomrörningsförlopp likarta-de dem i en mesaombränningsugn.The invention will be described for the case of combustion of mesa but includes all cases of cargo treatment in rotary kiln which have gas flow and material stirring processes similar to those in a mesa combustion furnace.
Mesan är det kalciumkarbonatslam som uppstär vid kausticering av grönlut med brand kalk i samband med kemikalieitervinnin-gen i sulfatmassafabrikerna.The mesane is the calcium carbonate sludge that arises when causticizing green liquor with fire lime in connection with the chemical recovery in the sulphate pulp mills.
För kausticeringen erforderlig bränd kalk erhälles tili över-vägande del genom ombränning av mesan, vanligtvis i en roterugn.For the causticization required burnt lime is obtained mainly by re-burning the knife, usually in a rotary kiln.
Roterugnen lutar nSgot sS att mesan som införes genom ugnens övre ände kommer att röra sig, tili följd av att ugnen rote-rar, mot ugnens nedre ände och möta rökgaserna fran en olje-brännare i ugnens nedre ände varvid den omvandlas tili bränd kalk. Denna utmatas i ugnens nedre ände.The rotary furnace slopes slightly so that the blade introduced through the upper end of the furnace will move, as a result of the furnace rotating, towards the lower end of the furnace and meeting the flue gases from an oil burner at the lower end of the furnace whereby it is converted into burnt lime. This is discharged at the bottom of the oven.
Mesan tillföres roterugnen med en torrhalt av 60-75 S. Roterugnen indelas vanligtvis i tre zoner, torkzon, mellanzon och brännzon.The blade is fed to the rotary kiln with a dry content of 60-75 S. The rotary kiln is usually divided into three zones, drying zone, intermediate zone and burn zone.
Torkzonen, som normalt är ca en fjärdedel av ugnslängden, är tili större delen försedd med, med sinä bäda ändar i ugnsväg-gen fästade, slakt hängande kättingar i syfte att röra om mesan sa att en snabb och effektiv torkning av mesan erhSlles.The drying zone, which is normally about a quarter of the length of the furnace, is to a large extent provided, with sinew bed ends in the furnace wall, slaughtered hanging chains in order to move the knife so that a quick and efficient drying of the knife is obtained.
2 758842 75884
Mellanzonen, som utgör ca hälften av ugnslängden, Sr numera oftast försedd, helt eller delvis, med längsgaende frän ugnsväggen utgäende medbringare för omrörning av det finkorniga materialet, sä att värmeöverföringen blir bättre.The middle zone, which is about half the length of the furnace, is now usually provided, in whole or in part, with longitudinal joints from the furnace wall exiting carriers for stirring the fine grain material, so that the heat transfer is better.
Brännzonen, där kalcineringen av kalciumkarbonatet tili kal- o ciumoxid sker vid en temperatur överskridande 900 C, van-ligtvis 1000-1200°c, är klädd med högvärdigt eldfast och isolerande material.The burning zone, where the calcination of the calcium carbonate to calcium oxide occurs at a temperature exceeding 900 ° C, usually 1000-1200 ° C, is coated with high-quality refractory and insulating material.
Rökgaserna lämnar roterugnen med en temperatur normalt mellan 170 och 240°C.The flue gases leave the rotary furnace with a temperature normally between 170 and 240 ° C.
Mätningar vid konventionell drift av mesaombränningsugnar har visat avsevärt mycket högre temperatur hos den utgäende rök-gasen än pä ugnsväggen. Därav kan slutsatsen dras att mycket av rökgasen gär genom ugnens centrum med begränsad värmeöver-föring tili mesan.Measurements in conventional operation of lumber combustion furnaces have shown considerably higher temperature of the outgoing flue gas than on the furnace wall. From this it can be concluded that much of the flue gas passes through the furnace center with limited heat transfer to the knife.
Enligt uppfinningen, som kännetecknas huvudsakligen av det som anges i patentkravets 1 kännetecknande del, kan värmeöverföringen frän rökgasen tili mesan förbättras och därigenom betydande energimängder sparas. Detta sker genom att centralt i ugnens tork- och mellanzoner skärmar hänges in, vilka tvingar rökgasströmmen ut mot periferin och ästadkommer tur-bulens i rökgasströmmen. Skärmarna är lämpligen konformade, och sä stora att de var och en täcker 15-30 % av ugnsrunanets tvärsnittsarea. Skärmarna fästes med kättingar i ugnsväggen sä att deras centrum sammanfaller med ugnstvärsnittets centrum. Konens spets riktas mot gasströmmen (mot ugnens nederän-de). Det är i allmänhet tillräckligt med 3-5 skärmar placera-de med jämna mellanrum i tork- och mellanzonen.According to the invention, which is characterized mainly by the characterizing part of claim 1, the heat transfer from the flue gas to the mesh can be improved, thereby saving considerable amounts of energy. This is done by centrally inserting screens in the oven's drying and intermediate zones, which force the flue gas stream out to the periphery and produce turbulence in the flue gas stream. The screens are suitably cone shaped, and so large that they each cover 15-30% of the cross-sectional area of the furnace. The screens are fastened with chains in the oven wall so that their center coincides with the center of the oven cross section. The tip of the cow is directed towards the gas stream (towards the bottom of the oven). Generally, there are enough 3-5 screens placed at regular intervals in the drying and intermediate zone.
Genom arrangemanget förhindras sträkbildning i roterugnen och den varmare rökgasen som normalt strömmar i centrum av ugnen pressas ut mot periferin och blandas med den kallare rökgasen, j 3 75884 varvid en betydande förbättring av värmeöverföringen till kalkmaterialet erhälles, vilket gynnsamt pÄverkar värmeekono-min.The arrangement prevents stretching in the rotary furnace and the warmer flue gas which normally flows in the center of the furnace is pressed out against the periphery and mixed with the cooler flue gas, thereby providing a significant improvement of the heat transfer to the lime material, which adversely affects the heat effect.
Genom förfarandet kan kättingarna i torkzonen helt avlägsnas eller kortas tili ett minimum.The process allows the chains in the drying zone to be completely removed or reduced to a minimum.
Uppfinningen beskrives nedan med ett exempel frän praktisk tillämpning med hänvisning till figurerna 1 och 2.The invention is described below with an example from practical application with reference to Figures 1 and 2.
I figur 1 är 1 roterugnen, 2 ugnens nedre ände med oljebrän-naren 3, 4 skruv för inmatning av mesan, 5 utloppet för rök-gaserna, 6 utloppet för den brända kaiken, 7, 8 och 9 skärmar enligt uppfinningen.In Figure 1, 1 is the rotary kiln, 2 lower end of the furnace with the oil burner 3, 4 screw for feeding the knife, 5 the outlet for the flue gases, 6 the outlet for the burnt quay, 7, 8 and 9 screens according to the invention.
Figur 2 visar en skärm 10 upphängd med kedjor 11 i ugnsväggen 12.Figure 2 shows a screen 10 suspended with chains 11 in the furnace wall 12.
I en roterugn 1 placerades tre skärmar 7, 8, 9 enligt uppfinningen pa 15 m (7), 25 m (8) och 35 m (9) frän ugnens Övre ände där inmatningsskruven 4 för mesan sitter.In a rotary kiln 1, three screens 7, 8, 9 according to the invention were placed on 15 m (7), 25 m (8) and 35 m (9) from the upper end of the furnace where the knife inserting screw 4 is located.
Skärmarna 7, 8, 9 täckte vardera 15 % av ugnsrummets tvär-snittsarea.The screens 7, 8, 9 each covered 15% of the cross-sectional area of the furnace room.
Roterugnens 1 längd var 87 m och innerdiameter 3,15 m. Den var helt utan kättingar i torkzonen.The length of the rotary furnace was 87 m and inner diameter 3.15 m. It was completely without chains in the drying zone.
Genom denna ändring enligt uppfinningen sänktes temperaturen • · o pa den utgaende rökgasen med 40 c, vid nominell kalkproduk- tion, fran 170-180°C före ändringen tili 130-140°C efter ändringen. Sänkningen av rökgastemperaturen motsvarar en ol- jebesparing av ca sju liter per ton produkt (90 % CaO).By this change according to the invention, the temperature of the outgoing flue gas was lowered by 40 ° C, at nominal lime production, from 170-180 ° C before the change to 130-140 ° C after the change. The reduction in flue gas temperature corresponds to an oil saving of about seven liters per tonne of product (90% CaO).
Claims (5)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE8400578 | 1984-02-06 | ||
SE8400578A SE8400578L (en) | 1984-02-06 | 1984-02-06 | DEVICE FOR IMPROVING HEATING ECONOMY IN ROOT OVEN |
Publications (4)
Publication Number | Publication Date |
---|---|
FI842335A0 FI842335A0 (en) | 1984-06-08 |
FI842335A FI842335A (en) | 1985-08-07 |
FI75884B FI75884B (en) | 1988-04-29 |
FI75884C true FI75884C (en) | 1988-08-08 |
Family
ID=20354603
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FI842335A FI75884C (en) | 1984-02-06 | 1984-06-08 | Arrangements to improve the heating economy in rotary kilns |
FI850260A FI850260L (en) | 1984-02-06 | 1985-01-21 | ARRANGEMANG FOER FOERBAETTRING AV VAERMEEKONOMIN VID DRIFTEN AV ROTERUGNAR, I SYNNERHET MESAOMBRAENNINGSUGNAR. |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FI850260A FI850260L (en) | 1984-02-06 | 1985-01-21 | ARRANGEMANG FOER FOERBAETTRING AV VAERMEEKONOMIN VID DRIFTEN AV ROTERUGNAR, I SYNNERHET MESAOMBRAENNINGSUGNAR. |
Country Status (5)
Country | Link |
---|---|
ES (1) | ES539584A0 (en) |
FI (2) | FI75884C (en) |
FR (1) | FR2559246A1 (en) |
NO (1) | NO845133L (en) |
SE (1) | SE8400578L (en) |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR414845A (en) * | 1910-04-15 | 1910-09-12 | Jean Albert Paul Lavocat | Improvements in cement kilns |
FR609023A (en) * | 1925-01-07 | 1926-08-06 | Rotary drum for cooling or processing materials using an air stream | |
FR820464A (en) * | 1936-04-14 | 1937-11-12 | Improvements to rotary kilns | |
FR1220585A (en) * | 1958-05-21 | 1960-05-25 | Fellner & Ziegler Gmbh | Rotary oven for firing cements, magnesite, lime, plaster or similar products |
-
1984
- 1984-02-06 SE SE8400578A patent/SE8400578L/en unknown
- 1984-06-08 FI FI842335A patent/FI75884C/en not_active IP Right Cessation
- 1984-12-03 FR FR8418387A patent/FR2559246A1/en active Pending
- 1984-12-20 NO NO84845133A patent/NO845133L/en unknown
-
1985
- 1985-01-15 ES ES85539584A patent/ES539584A0/en active Granted
- 1985-01-21 FI FI850260A patent/FI850260L/en not_active Application Discontinuation
Also Published As
Publication number | Publication date |
---|---|
ES8602241A1 (en) | 1985-11-16 |
FI850260L (en) | 1985-08-07 |
ES539584A0 (en) | 1985-11-16 |
FI842335A (en) | 1985-08-07 |
FR2559246A1 (en) | 1985-08-09 |
SE8400578D0 (en) | 1984-02-06 |
FI850260A0 (en) | 1985-01-21 |
SE8400578L (en) | 1985-08-07 |
NO845133L (en) | 1985-08-05 |
FI842335A0 (en) | 1984-06-08 |
FI75884B (en) | 1988-04-29 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
MA | Patent expired |
Owner name: TERMORAK OY |