SI20766A

SI20766A - System for collection and removal of fumes of electric arc furnace

Info

Publication number: SI20766A
Application number: SI200000299A
Authority: SI
Inventors: Srečko Prislan; Matjaž PRISLAN
Original assignee: Srečko Prislan; Matjaž PRISLAN
Priority date: 2000-12-01
Filing date: 2000-12-01
Publication date: 2002-06-30

Abstract

The device for the collection and removal of fumes of electric arc furnaces consists of a chassis (1), which features openings (5), with electrodes (6) running through them, and an opening (11), which features an outlet channel (12), which is on the opposite end, usually outside the premises, where the furnace is located, inserted into a dedusting filter (13) with a suction fan (13') connected after it. Between each of the electrodes (6) and the corresponding opening (5) which it is running through, there is a circular slot (7), while the fitting of the chassis (1) on the furnace cover (2) is made with spacers (8), resulting in gaps (10) between the lower end of the chassis (1) and the cover (2).

Description

Predmet izuma je naprava za zajemanje in odvajanje plinov pri elektro obločni peči.The subject of the invention is a device for the capture and extraction of gases in an electric arc furnace.

Tehnični problemA technical problem

Tehnični problem, ki ga rešuje izum je, kako zasnovati tako napravo za lovljenje in odvajanje plinov pri elektro obločni peči, ki bo enostavna, brez posebnih dodatnih priključkov in naprav, ki bi za to okolje morali biti konstruirani posebej natančno in zahtevno, da bi vzdržali v tem toplotno in mehansko zahtevnem okolju, da ne bi zaradi svojega nedelovanja utegnili povzročati prekinitve delovanja električne obločne peči.The technical problem solved by the invention is how to design such a device for catching and extracting gases in an electric arc furnace, which will be simple, without special additional connections and devices, which for this environment should be designed especially precisely and demanding in order to maintain in this heat and mechanically demanding environment so as not to cause them to malfunction due to their inactivity.

Znano stanje tehnikeThe prior art

Znane naprave za zajemanje in odvajanje plinov pri električni obločni peči so izvedene iz ohišja, ki prekriva pokrov peči in ki zajema pline, ki izhajajo skozi reže ob elektrodah v okolico. Ker so elektrode višje od ohišja, so v njem izvedene odprtine za izhod elektrod.Known devices for gas capture and discharge in an electric arc furnace are made of a housing that covers the furnace cover and which captures gases emitted through the slots adjacent to the electrodes in the surrounding area. Because the electrodes are higher than the housing, there are openings for the output of the electrodes.

27661-2.doc/ll-01/D26-Vr27661-2.doc / 11-01 / D26-Vr

Zaradi visoke temperature pokrova peči, se prenaša le-ta tudi na ohišje naprave za zajem plinov. Zato so tesnilni obroči ob elektrodah izvedeni na posebej zahteven način. Tudi ventilatorji ob napravi morajo prenašati visoko temperaturo, ker so plini ob izhodu iz peči zelo vroči. Poseben problem je izvedba odvodnih kanalov plinov, ki morajo biti gibki, da sledijo odpiranju pokrova peči in naprave za zajem plinov. Vse to prispeva k zamotani konstrukciji naprave za zajem in odvajanje plinov.Due to the high temperature of the furnace lid, it is also transferred to the housing of the gas collection device. Therefore, the sealing rings next to the electrodes are designed in a particularly challenging way. Also, fans at the appliance must withstand high temperatures because the gases are very hot when exiting the stove. A particular problem is the design of the gas exhaust ducts, which must be flexible in order to follow the opening of the furnace cover and gas collection device. All this contributes to the intricate construction of the gas capture and discharge device.

Obstaja pa potreba po enostavnejši tovrstni napravi, ki bo manj obremenjena z možnimi okvarami, ne nazadnje naj bi njena nižja cena prispevala k nižjim proizvodnim stroškom jekla.However, there is a need for a simpler installation of this kind, which will be less burdened with possible failures, not least its lower cost should contribute to lower steel production costs.

Rešitev tehničnega problemaThe solution to a technical problem

Opisani tehnični problem je rešen z novo napravo za zajem in odvajanje plinov iz elektro obločne peči, katere bistvena značilnost je v tem, da ohišje pokriva pokrov peči v odmiku tako, da je med njima izvedena ozka reža. Prav tako so odprtine za elektrode večje s kolobarjasto režo med njimi in ohišjem. Odvajanje plinov skozi odvodni kanal je izvedeno samo s podtlakom, ki ga proizvajajo sesalni ventilatorji za filtrom, ki je lociran odmaknjeno zunaj prostora, v katerem se nahaja peč. Količina sesanega zraka je večkrat večja od predvidene količine plinov iz peči. S tem zagotovimo sesanje okoliškega zraka skozi režo med napravo in pokrovom peci ter skozi režo ob elektrodah. Podtlak v napravi zagotovi, da plini ne uhajajo iz naprave v okolico razen skozi odvodni kanal. Sesanje okoliškega zraka pa ima dodatno koristno posledico, da hkrati znižuje temperaturo okolice, ki je sicer za delavce obremenjujoča. Okoliški zrak, ki se meša s plini v napravi in teče skozi kanal v velikem pribitku glede na pline, tudi zagotavlja nižjo temperaturo naprave in kanalov. Zato je potrebno napravo bistveno manj hladiti z vodo, daje njena zunanja površinska temperatura znosna. Temperatura plinov v območju filtra in ventilatorja je že pod 60θΟ, zato niso večThe described technical problem is solved with a new device for the capture and extraction of gases from the electric arc furnace, the essential feature of which is that the housing covers the furnace cover in a distance such that a narrow gap is made between them. Also, the openings for the electrodes are larger with a circular gap between them and the housing. The discharge of gases through the exhaust duct is carried out only by the pressure produced by the suction fans behind the filter located away from the space in which the furnace is located. The amount of intake air is several times the estimated amount of gas from the furnace. This ensures that the ambient air is sucked in through the gap between the appliance and the furnace cover and through the slot next to the electrodes. The pressure in the device ensures that no gas escapes from the device into the surrounding area except through the discharge duct. The intake of ambient air, however, has the additional beneficial consequence of lowering the ambient temperature, which is otherwise burdensome for workers. Ambient air, which mixes with the gases in the device and flows through the duct at high surplus relative to the gases, also provides a lower temperature for the device and ducts. Therefore, the device needs to be significantly less cooled with water to make its surface surface tolerable. The temperature of the gases in the filter and fan area is already below 60θΟ, so they are gone

27661-2.doc/ll-01/D26-Vr temperaturno obremenjeni. Velika količina zraka glede na pline nadalje zagotavlja, da je količina trdih prašnih delcev na enoto odvajanih plinov majhna.Zato se ne povečuje specifična teža plinov in delcev, s čimer je ohranjena visoka pretočna hitrost skozi kanale. Prašni delci ne padajo v večjih količinah na dno kanalov, ampak prispejo do filtra, kjer se ločijo od plinov. S tem je zagotovljena dolg obratovalni čas naprave brez potrebnega čiščena kanalov.27661-2.doc / 11-01 / D26-Vr temperature laden. The large amount of air relative to the gases further ensures that the amount of particulate matter per unit of exhaust gases is small. Therefore, the specific gravity of the gases and particles is not increased, thereby maintaining a high flow rate through the ducts. Dust particles do not fall in large quantities to the bottom of the ducts, but reach the filter where they separate from the gases. This ensures a long operating time of the device without the necessary cleaning of the channels.

Pri zalaganju peči s surovino dvignemo skupaj s pokrovom peči tudi nanj nameščeno ohišje. Gibek del kanala omogoča zasuk ohišja. Na enak način se zasuka ohišje s pokrovom peči pri izlivanju taline.When loading the stove with the raw material, the housing enclosed thereon is lifted together with the stove lid. The flexible part of the duct allows the housing to rotate. In the same way, the housing is rotated by the furnace lid when pouring the melt.

Podrobneje je bistvo izuma pojasnjeno s sledečim opisom izvedbenega primera in priložene risbe, na kateri kaže sl. 1 shematski prikaz elektro obločne peči z napravo za zajem in odvajanje plinov po izumu.The essence of the invention is explained in more detail by the following description of an embodiment and the accompanying drawing, in which FIG. 1 is a schematic view of an electric arc furnace with a gas capture and discharge device according to the invention.

Naprava za zajem in odvajanje plinov pri elektro obločni peči je izvedena iz ohišja 1, ki je nameščeno samo v smislu nalega na pokrovu 2 elektro obločne peči 3. Ohišje 1 je dvostensko in predvideno za ohlajanje s hladilno tekočino preko priključkov 4. Nadalje so v ohišju izvedene odprtine 5, skozi katere tečeje elektrode 6 in sicer tako, da je med elektrodami 6 in odprtino 5 izvedena kolobarjasta reža 7. Nased ohišja 1 na pokrovu 2 peči je izveden z distančniki 8, zaradi katerih je spodnji rob ohišja 1 odmaknjen od pokrova 2, da so med njima izvedene reže 10. Na pokrovu 1 je izvedena odprtina 11, na katero je priključen odvodni kanal 12, ki je na nasprotnem koncu, praviloma zunaj prostora, v katerem se nahaja peč, uveden v prašni filter 13, za katerim je nameščen sesalni ventilator 13'. V kanalu 12 je izveden v odcep 14 za pomožni kanal 15, ki lovi izpod stropa prostora ob izlivanju taline izhajajoče pline iz peči. V kanalu 12 jeThe device for the capture and discharge of gases in the electric arc furnace is made of a housing 1, which is installed only in the sense of the cover 2 of the electric arc furnace 3. The housing 1 is double-skinned and is intended for cooling with coolant via the connections 4. Further in the housing the openings 5 through which the electrodes 6 flow through, so that a circular slot 7 is formed between the electrodes 6 and the opening 5. The casing of the housing 1 on the furnace lid 2 is made by spacers 8 which make the lower edge of the housing 1 away from the cover 2 that openings 10 are made between them. The cover 1 has an opening 11 to which a drainage duct 12 is connected, which is at the opposite end, as a rule, outside the space in which the furnace is located, introduced into the dust filter 13, behind which 13 'suction fan installed. In duct 12, it is made in the outlet 14 for the auxiliary duct 15, which catches the gas from the furnace from below the ceiling when the melt is poured. It's in Channel 12

27661-2.doc/ll-01/D26-Vr med ohišjem 1 in odcepom 14 izveden gibek meh 16, ki omogoča nagibanje peči in odpiranje pokrova peči pri nameščenem ohišju in nanj stalno priključenem odvodnem kanalu.27661-2.doc / 11-01 / D26-Vr A flexible bellows 16 is provided between the housing 1 and the branch 14, which allows the furnace to be tilted and the furnace lid opened with the housing installed and the drainage channel permanently connected to it.

Razmerje zraka, ki ga sesa ventilator 13' iz okolice peči skozi reže 7 in 10, in plinov, ki izhajajo iz peči in jih zajema naprava, je približno 20 : 1.The ratio of air drawn by the fan 13 'from the furnace surroundings through the slots 7 and 10 and the gases emitted from the furnace and covered by the apparatus are approximately 20: 1.

Oblika in velikosti rež 7 in zlasti rež 10 je poljubna ter se lahko prilagaja posamičnim zahtevam. Tudi hlajenje ohišja je lahko izvedeno na poljuben način, drugačen od opisanega.The shape and size of slots 7, and in particular slots 10, are arbitrary and can be adapted to individual requirements. The cooling of the housing may also be performed in any manner other than that described.

Obstajajo tudi take naprave za zajem in odvajanje plinov iz peči, ki imajo dodatek za zajem plinov iz okolice iztočnega lijaka ob izlivanju taline. Strokovnjak s tega področja lahko pri gradi opisani napravi po izumu ta dodatek, ne da bi obšel bistvo izuma.There are also such devices for the capture and extraction of gases from the furnace, which have an additive for the capture of gases from the vicinity of the outflow funnel at the time of the pouring of the melt. One skilled in the art can construct this appendix according to the invention without circumventing the essence of the invention.

Tudi kanali, filter in ventilator so lahko spreminjani in prilagojeni posameznim pogojem,ne da bi vplivali na vsebino tega izuma.The ducts, filter and fan can also be modified and adapted to individual conditions without affecting the content of the present invention.

Claims

Patent claims

A gas intake and extraction device for an electric arc furnace, which is made of a housing (1) in which openings (5) through which the electrodes (6) flow and the opening (11) to which the outlet is connected a channel (12) at the opposite end, as a rule, outside the space in which the furnace is housed, introduced into the dust filter 13 behind which a suction fan (13 ') is mounted, characterized in that it is between the electrode (6) in each case. and an opening (5) through which it flows, an annular slot (7) is provided and the housing of the housing (1) on the lid (2) of the furnace is made with spacers (8) which cause the lower edge of the housing (1) to move away from lids (2) to have slots (10) between them.

Apparatus according to claim 1, characterized in that a trapping channel for gases emanating from the furnace pouring out from the furnace above the ceiling above the furnace, preferably as an auxiliary channel (15), is connected to a branch (14) in the channel (12) ).

Apparatus according to claims 1 to 3, characterized in that the ratio of air drawn by the fan (13 ') from the furnace surroundings through the slots (7 and 10) and the gases emitted from the furnace and covered by the appliance is approximately 20; 1.