DE2749126A1 - INDUSTRIAL FURNACES, IN PARTICULAR FOR HEAT TREATMENTS - Google Patents

Description

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3 Λ 1260-2027 / Er

Ii H] · 'IHDUKG

Industrial furnace, especially for Has never been defeated

Inventor:

Kurucsai, Laaclo - Dipl. Haochincüiiiü '. Up. yd%

Wunderlich, Juuoü - Dipl. Llaacliincniu ^ oLp. 2ü ', <>

G'uepai, Dczüb «Liip: ¹ .. Ilüttoniuij» 1> ρ _β 2G Yj

Lolgai ¹ , Gabor - Dipl. Chemie inc. Bp. 7 / y

Puuatornük. Andor - Hüttenin ^. Budapoai $ 7 o

iViij der Anmeiduns: J ;. November 1976

: 13937

Geßenatand der Ei «find us is an induction ofeu, the one with fire-resistant thermal ioolieratoffaua clothing provided fibrous structure, e.g. B. for an electric drive with electrical resistance is.

Known and with fireproof heat insulation material clothing industrial furnace constructions with fibrous structure, the calibration for Warino treatment tasks suitable. Such have been z. B. in the USA magazine "Industrial Heating" / Nationul Industrial Publishing Co., 1400 Union Trust Bldg., Pittsburgh, PA 15219 / in 1974 May Sorrow by P.H. Fidler on pages 74-81 in his contribution

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"Energy conoerving ceramic fiber lining for heat treating furnaces ", also in the journal" Industrial Heating "of April 1975 on pages 74-82 ici article from the Johna-Manville company entitled "Guide to lining furnacea with ceramic fiber" boachrioben.

GoBioinaaniüa Lloi'kmal dioaer furnace iüt, daha the execution of the predominant part of their clothing / Arboitauuu clothing / aua feuerfeatcm faaorigein \ / üriiieiaoliermuterial with gaa or oil fired clay Induatrieöfon is realized, with the division the clothing of with electrical resistance 3tanda heating installed induction ovens aua feuerfoatem fibrous thermal insulation material has not yet been

löat iat »

A further a gemoinaamea feature of the aor gaa and oil-fired furnace constructionon iot, daaa on the aua faaerigom Peuerfeat-Iaoliermaterial depicted aua clothinga surface no indication of the furnace a guaranteeing \ Yärmoquelle arranged iat, but da33 the burner, fires in a structure in comparison to the fires conventional, generally also ochamot-like fire feathers open to special masonry designed for this task

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are arranged

These furnace designs are unsuitable for attaching the electric radiator to the loose, fire-proof heat insulation faaerigor Structure and unsuitable for a caused by electrical heating resistors .: such :: local; .overheating of the thermal insulation jacket prevent fibrous structure, as a result of which the surface of the fibrous thermal insulation lining eroohmelts and the lining therefore loses its heat-insulating effect and ceases to function the technological tasks become unsuitable.

The above-mentioned deficiencies in the

Ofon constructions described in the above offer an opportunity to use the advantages offered by the fireproof thermal insulation materials with a fibrous structure in terms of energy, construction and operational management in the case of electrical resistance heating.

The aim of the invention is to secure a solution or execution, in addition to the application an electrical resistance heater fajjrigor the furnace lining made of refractory thermal insulation materials Structure can be formed and made by the

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Fireproof V / örme insulating outerwear of fibrous structure in relation to the energetic and operational management provided Vortoile fully ucid optimally exploited «» can.

The invented Induötrioofon iat uit a oua feuerfeoton faoerigon V / ärmeiooliorotoffen goforted work clothing, a furnace armor and made of ceramic V / Erkatoffen made trough elements, which, on the surface of the work aauakloaten, carry the heating elements connected in a straight line with electrical elements . The electrical resistance heating elements carried by the ceramic support elements in front of the surface of the working lining ensure the heating of the furnace. With one regarding

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the advantageous function Aueführung nehimen dio the heating elements supporting shaped body as structural elements to the mounting of the manufactured from loose faaorigou Wärmoisolierstoffen Auskleidduug to the furnace casing part; Furthermore, these ceramic support elements divide the work lining into channels in which the air forming the furnace atmosphere or other gaseous media for the purpose of preventing the heating resistances caused

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Local overheating of the lining flows through · In a further advantageous embodiment it warms up in the work clothes trained II £ e) fck channels through the work room The fans arranged in the furnace are circulated and warmed up by the heating resistances ο medium the oven goods in orator Linio by konvektivo War-. mo transmission.

Compared to the arboiteau claddings made from conventional refractory materials Oven results in arboits linings from faserigon refractory materials, heat storage is several times lower, and several times lower Weight of furnace steel structure, an essential lower specific or K electrical energy pre-break, classy, the heat treatment cycle is shorter and the oven loosing becomes higher · The furnace construction ensures an execution that is one by the electrical Resistance heating elements caused local overheating of the fibrous refractory thermal insulation lining Structure can prevent.

Figures 1 and 2 depict one for heat treatment tasks Serving embodiment of the furnace according to the invention, provided with a carriage, partially in section . For the arrangement of the heat treatment to be

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ORIGINAL INSPECTEO

Gutea 1 serves a Y / agen, doaaeu loading area} covered with Peuerfeatmuterial 2 iüt and the

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k'loichaoitiG uucla den Ofciibodonbildot, L) io hocliiiiohbaro Door 3 begins at the end of the stove. Dio lüoitcu- \; and do3 Ofena forms the with fcuerfoator V / ärineiüüliorauaklciduuG ' faaoriQcr structure voraohono oJ'.o 4. Dio Auakloiaung iat by means of the in uenkü continuously ancinandor ango-

koruiiiiachon Pormateino 5 and the indoren IIutonG awgeordaoton v / äi ⁵ mobe8tand igen Stohlbefeati- (iiinsoeloinentü 7 bofeatigt on the furnace shell 8. In the anaeses 9 aind the ceramic atangon 10 are arranged on the kerauiiachen porn stones 5 ouagebuild on the kerauiiachen Porniatein 5 ouagebuild on which the heating coils 11 are.

Dio heating resistors 11 are characterized by dio in the fire featen Wärmoiaolierauakleidung faaericor structure ^ eingepaaaten ceramic Hülaen iaoliert to the herciusgei'ührt to Oich bekanntorieloktriachen Anuclilüaacn · Dio Aich aonkrechi) aneintihdor ünpcioaondon kerauiauhon ^'l'l j rackörpor toilon d.'. O ^ in faüürigo Arboituauakluidung aenkrochto Hoizi'.uiiüle Y'j up. The liüizkaniilo 13 are transformed into work clothing 4 by making the dau pai'allol and the warmth arranged perpendicular to the keraifliachon Trufkkörorn 5

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resistant sheet steel. 14 towards the Arbeitsruum 15 dos of oven dismantling.

Dor by the electric motor IG ougetrie «

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bono Uowälzlüftor V / serves to & i Umwälzcivdor ozone «Qtnioaphäro by dio Ueickanälo IJ aouio by dio on doi · Ladefläoho doa Ofcnwogoiia 2 voreoaehcucu Bodeükauülo Io. - <

Dor Ijotriob doü erfindungagemäoseu Of ena takes place iu üüchatehonder Woiao:

The products to be subjected to the heat treatment 1 are grounded on the carriage 2 and the oven is closed in the middle of the doors 3. The mittola deo electric motor ο 13 driven ümwälzlüftor / ventilator / 16 is geootzt in gong and the Hciauidera buildings 11 are made to glow by simply turning the electric strouoa on. The lloiz channels l'ü through the Lüftor / Vontilator / 16 iui> gewälzto Oi'onufcicoapioiiut überälzto Oi'onufcicoapioiiut überälzto Oi'onufcicoapioiiut überälzto Oi'onufcicoapioiiut überälzto Oi'onufcicoapioiiut through the feuorfoote Wäraoiooliorauskloierung faaeriger structure 4, the koramiachen Befeotigunga- and load-bearing stoneo 5 as well as daa heat resistanto sheet steel 14 ic [(ülto heat orgy and dioue u flows through the Ijouenkonäle 18 into the Arboiteroum doo Ofena and then passes there primarily through konvektivo

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Heat transfer & uug dio aufßünommone heat energy the good 1 to be subjected to the heat treatment and afterwards, the circulation fan 16 again warms up the fleizkanälo 13 transported.

How to see it, aich the Konotruktiou is suitable doa Ofena actually largely duua dio lining made of fireproof thermal insulation liuterial Fauoriger structure when using electrio rather V / idoratanda heating auogebildenlwirdlwird and therefore lconnenp.ni Compared to those with outfits aua conventional Pouerfeatatoffen / z. B. Fireclay / Veraehenen ovens with electric resistance heating the following advantages of the refractory ones with regard to energetics, construction and operational management Thermal insulation clothing with a fibrous structure can be optimally used:

The coefficient of thermal conductivity of the fibrous structure made of refractory thermal insulation material Work clothing is about 1/10 of its volume weight about 1/15 of the pienendon for similar tasks aua fireclay made furnace linings.

Accordingly, the heat storage of a nit oinor made of fireproof thermal insulation material is faoorigor Structure trained work lining

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equipped furnace with Eloktrowidorstanduheiuuug about 30-40 times lower due to the strength and IJosso dor, which are several orders of magnitude lower Peuorfostauakloidunc · Dio another in Bocuf'auf Construction and Botricbo management eichorgobondon Favorable Polgen di030a bosondoron Vortoiloo are followondo:

In the case of induction ovens with intermittent operation is compared to the conventional design because of the fact that it is only a fraction Heat storage and heating can be carried out much faster, as a result of which the heat treatment cycle shortened and the production capacity of the furnace while reducing the specific Electric energy consumption increased. The oussorordontlich loichte work oauo clothing orfordort oino um multiple orders of magnitude, but less of the Steel construction, which means that the furnace can be set up cheaply and quickly. The installation in the general uufgorollt delivered in IJattcnforu fcuorf outon auukloendung i'usorigor structure amounts nuroin Bruclrooil iu Vexgloich zui | installation time of hoi'köiihilichon ächanottateino and may boroitquuf

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doia installation site of the furnace steel construction be because the elastic light fibrous

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ii'euorf üat-l / armored material ready in the oven built-in olino risk of damage to the boot to be promoted to the Aufalollunguort deu Ofena can. In the Ureobniα the possibility of this prefabrication the construction of the furnace can be a pacifier at the same time the need for living work is lower, i. H. productivity dea Bauoa and the Ilontage iot by multiple orders of magnitude bouuor ala in the conventional execution.

Another significant advantage beatelit in the fact that the features forming part of the arboita lining are a simultaneous fulfillment The following tasks are suitable: You are responsible for the fire-proof v / arneiaolierauekclothing with a fibrous structure to the furnace shell, hold the hoiz wires in the V / eiao, daaa die ochadhaftgowordenon Heizdrahtebachnitto easily adapted to the format Anautzen horauagenommon and also opens through new heating wire ο erosiert. Furthermore, the apeziulen formates with the oine fauorigo u-structure on woiaendon feuorfeates, but under the effect of the local overheating caused by the heating wire to slightly melt down locally Wäi'meioolier lining and the work area

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des Ci'ens delimited by sheet metal heaters and prevented by circulating the furnace atmosphere in them Channels the local overheating of the work uoua clothing or the melting, d. H. the fast one Consumption of the same. These characteristics and the arrangement of the pormatoine are guaranteed; ^ leichaeitic a fast transmission with good efficiency and uniform in the entire working area of the furnace .., primarily convective transmission the heat energy to be transferred to the products to be subjected to the heat treatment, consequently the quality of the heat-treated goods to ensure a high level of heat treatment

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Claims (4)

Claims 1. Industrial furnace with electrical resistance heating, especially for heat treatment tasks Goods, the furnace having a heat-insulating lining and heating means for heating the goods, characterized in that the lining is used as a refractory thermal insulation lining with fibrous Structure (4) formed and with a shaped stone star (5) is equipped, and that this shaped stone system in a straight line of per se uninterrupted, subsequent shaped bricks with heating channels (13) provided on and formed by them and the heating insulation lining is held on a furnace shell (8) by means of this molded stone system and From this lining an electrical resistance heating system (U) arranged parallel to the servant is provided. 2. Oven according to claim 1, characterized in that on the side of the ceramic shaped stone system (5) approaches (9) are provided, and the rods carrying the heating wires of the resistance heating system (11) in these approaches (10) are arranged. 3. Furnace according to claims 1 and 2, characterized in that that the fibrous structure (4) and the heating wires (resistance heating system 11) through a heat-resistant steel sheet (14) are separated from the working space of the furnace (15). 809819/0854 2-2749 4. Oven according to claim 1, characterized in that the heating channels (13) with their one end on a circulation fan (17) and with their other end are connected to the channels (18) provided on a loading surface (2) of a cargo carrier. 9819/0854