CN101625200A

CN101625200A - Energy-saving intermittent pulse-feeding technology of closed submerged arc furnace

Info

Publication number: CN101625200A
Application number: CN200910164488A
Authority: CN
Inventors: 巴涌
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-07-31
Filing date: 2009-07-31
Publication date: 2010-01-13

Abstract

The invention relates to an energy-saving intermittent pulse-feeding technology of a closed submerged arc furnace. The feeding method of the closed submerged arc furnace is a smelting intermittent pulse-feeding mode of the closed (semi-closed) submerged arc furnace, which is proposed after various smelting principles and a plurality of special factors are deeply researched and can be applied to the smelting of calcium carbide, yellow phosphorus, silicon-based metal alloys (ferrosilicon, calcium silicon, barium ferrosilicon, metallic silicon, and the like), manganese-based metal alloys (ferromanganese, silicon manganese, metallic manganese, and the like), nickel-based metal alloys, chrome-based metal alloys, tammite, ferrotitanium, and the like or other smelting. The technology enables a domestic closed furnace using general raw materials to lower the power ton consumption by 3-10 percent and increase the yield by 2-20 percent and benefit the safe and stable operation of subsequent environment-friendly dedusting equipment and the implementation of an unmanned control technology of submerged arc furnaces, thereby having a profound popularization meaning and development potential on various large-scale closed submerged arc furnaces over 25*10<6> VA.

Description

Closed submerged stove energy-saving type intermittent pulse feeding technology

Technical field

The present invention is used for the novel technology that feeds intake of the smelting of closed submerged stove, its feeding mode and the change at interval that feeds intake concerning smelting or the hot stove industry in ore deposit, and it is slotting down directly to influence its smelting process, electrode, and directly influences the energy consumption of metallurgical effect and smelting.

This invention sealed furnace comprises all calcium carbides, yellow phosphorus, silicon system (ferrosilicon, silico-calcium, silicon barium, metallic silicon etc.), manganese system (ferromanganese, silicomanganese, manganese metal etc.), the perhaps closed submerged stove of various employing electrodes such as chromium system, nickel system, ferrotungsten, ferrotianium and non-electrode, power supply mode is a direct current, low-frequency ac, intermediate frequency, high-frequency ac, or plasma smelting stove, the closed submerged stoves of novel energy such as electromagnetism smelting furnace.Supply transformer can adopt three-phase transformer or single-phase transformer.Supply voltage can be used for any electric pressures such as 35KV---110KV, and the Electrode for remelting of stove can use any electrode of self-baking or prebake.

Technical background

From the various closed submerged stoves of external birth, from mid-term 80 year last century, introduce China latter stage, again to the national standard that becomes various smelting industry development so far and promote, sealed furnace all is to adopt continuous feeding, only have an accident or blowing out (a kind of four to five little iron props are torn the manually-operated valve into tremie pipe open with artificial inserted link valve by reservation, can't realize the conventional valves of automatically control and Long-distance Control) carry out fracture, when practical operation and working of a furnace adjustment, all there are many shortcomings in this mode, mainly be when lifting on the stove electrode, to adopt suitable dry combustion method to reduce charge level, realize that the sealed furnace electrode better gos deep into inserting down.For a lot of smelting power consumptions bigger as 75 ferrosilicon, metallic silicon, silico-calcium and silicomanganese, calcium carbide, yellow phosphorus sealed furnace etc., (other smelts the at present domestic sealed furnace that seldom has), the sealed furnace continuous-feeding is toasted and the intensification of conducting heat the raw material that is deposited in upper furnace for a long time by furnace gas, cause its material resistance to reduce, make electrode be difficult to insert down, so it is higher that at present domestic large-scale sealed furnace is smelted ton unit consumption electricity, the stove fault of deriving is many, smelt ton power consumption and production stability and continuity well below the open stove of tradition, more can't embody the scale and benefit of large-scale airtight stove, restricted the development and the popularization of closed submerged stove technology.

Summary of the invention

A. goal of the invention

Adopt the intermittent feed mode, simply feel all right as waste part heat and electric weight in the surface, actually this is not so: because sealed furnace is different from main 3 points of open stove of tradition or internal fired furnace, the one, bell is airtight, the charge level furnace gas does not burn, and does not help reducing furnace surface temperature and do not burn, and is beneficial under the electrode to insert, be good method, (tail gas it with also developing a circular economy) simultaneously.The 2nd, it is better that airtight furnace charge buries electrode, usually at 100-250mm, obviously is better than traditional burner electrode operation 300-500mm, and it is good more that raw material buries electrode, and it is few more to expose electrode, and energy-saving effect is good more, also is beneficial to energy-conservation.The 3rd, be exactly the continuous-feeding during sealed furnace is produced, this point is that sealed furnace is opened the different of stove maximum with tradition, also is to cause most sealed furnace unit consumption to be higher than the main cause of the open stove of tradition at present.

Continuous-feeding makes and is deposited in upper furnace for a long time and is toasted by furnace gas, cause its material resistance to reduce, make electrode be difficult to insert down, intermittent feed when adopting the ordinary production operation, or move and adopt when undesired intermittently or the pulse feed, temporarily slattern boiler face part heat, can prevent to lift on the electrode phenomenon fully takes place, and help inserting under the electrode, concrete operation suitably increases feed at interval in the time of can lifting sign on working of a furnace instability or electrode have, increase the single inventory, be convenient in time adjust and change the working of a furnace, feed intake at interval according to different raw materials for metallurgy kinds and raw material grade, particle size features, be spaced apart 0.05-200 minute, individual design stove preferably can adopt the continuous dosing operation when raw material and the working of a furnace are good, the bad or working of a furnace of raw material adopts this patent method head to feed intake when unstable, can guarantee the stable and low consumption operation of stove (simultaneously also will in conjunction with the digitlization operator scheme).

B. technical scheme

1 pulse or intermittent feed control device (to call the fracture valve in the following text) can be placed in any position of stove tremie pipe, preferred design is in tremie pipe feed bin bottom or the material tube portion on the tremie pipe top of next-door neighbour's feed bin, do not advise being installed in bell more nearby, prevent that raw material from dropping into valve from big height and choking the material pipe easily, influence blanking, perhaps stove stops factors such as material material pipe bottom makes moist, expansion for a long time and blocks tremie pipe.(see: Fig. 1).

2 fracture valves adopt butterfly valve or other many clack valves of high temperature resistant, wear-resisting good leak tightness, the automatically logical material list that is positioned at the middle part of blanking pipeline in the bottom of fracture valve or expects to open automatically when pipe middle and lower part proper site is installed one or several blanking is to air shuttle valve, can close automatically when this valve does not have material and prevent that furnace gas from making progress from feed bin leakage, dissipation because of temperature rise, explosion-proof design is adopted in above-mentioned all valves suggestions.(I have designed the feed valve and the automatically logical material list of a categorical series and have just prepared to apply for a patent to air shuttle valve).

3 fracture valves adopt corresponding pneumatic or electric device control, control mode can be controlled the switch of single valve separately, when also controlling whole valve or the switch of indivedual valves, can realize long-range and local manual operation, and the feed that can realize each valve by robot control system(RCS)s such as DCS or PLC is at interval and the automatic control of feed time, also can by robot control system(RCS) and with the chain control of other variable switching value (signal).

4 blanking pipeline fracture valves and corresponding easily stifled position can increase electromagnetic shaker, preventing clogging up device, clear and coherent equipment and clear and coherent mouth, and the obstruction that prevents tremie pipe and valve is so that the tremie pipe of cleaning mediation in time.

5 will guarantee the not empty material of feed bin on tremie pipe top by corresponding artificial or automatic control mode when adopting this patents, the not empty material of fracture valve top material pipe, guarantee the anti-down single-phase valve sensitivity of gas of tremie pipe, suggestion takes the above-mentioned measure of this clause or other similar measure to reveal the influence safety in production to prevent furnace gas.

6. adopt intermittence or pulse feed when moving, can effectively prevent to lift on the above-mentioned electrode phenomenon fully takes place, help inserting under the electrode, can suitably increase feed when lifting on the electrode at interval, increase the single inventory, be convenient in time adjust and change the working of a furnace, feed intake at interval according to different raw materials for metallurgy kinds and raw material grade, particle size features, be spaced apart 0.05-200 minute, individual design stove preferably can adopt the continuous dosing operation when raw material and the working of a furnace are good, adopt this patent method head to feed intake when the bad or working of a furnace of raw material is unstable, can guarantee the stable and low consumption operation of stove

C. beneficial effect

After using this invention, all sealed furnace of China, semi-hermetic are adopted stove at present, adopt intermittence or pulse feed can realize being lower than the ton indicator of power consumption of traditional burner substantially,, protects the raw material of sealed furnace simultaneously because of burying electrode, the scale and benefit bigger with airtight stove, every consumption are better than the open mine heat furnace smelting index of tradition 5-20%.(large-scale stove also needs other electric power compensation device, improves power factor), unit consumption reduction simultaneously can reduce dust significantly and overflow boiler face, reduces raw materials for metallurgy ton consumption and is beneficial to the operation steady in a long-term of follow-up environmental protection dust arrester.

Description of drawings

Fig. 1 is the invention schematic diagram, and wherein (feed bin 12) and (feed bin 2) refers to all blanking bins, and control of fracture valve and Starting mode do not mark at drawing.

The specific embodiment

1 under the sealed furnace feed bin proper site increase be convenient to operate and be convenient to realize the fracture valve of Long-distance Control.

2 in master-control room or other position installation local operation platform control blanking when, can adopt the artificial and automatic double mode design of controlling simultaneously, and automatic control can be implemented by technical scheme 3.

The feed bin of 3 material pipes has to prevent to control to lack expects empty measure of expecting.

4. the inner of the boiler chamber atmospheric pressure adopts the sensitivity of controlling automatically and try one's best, guarantees that furnace gas does not have the no internal combustion of leakage.(except the semi-hermetic)

Suggestion the flue gas tilting prevention device place of tremie pipe fracture valve and its underpart increase abnormal alarm and watch-dog be convenient in control in time the monitoring material manage the blanking situation.

6 concrete feed blanking times and feeding coal be according to the different working of a furnaces, the different smelting and actual conditions setting such as material characteristic.

Claims

1. the intermittence or the pulsed feed-type of the hot stove in airtight (or semi-hermetic) ore deposit, be characterized in: the hot sealed furnace in ore deposit (containing furnace of calcium carbide) is removed under the ordinary production situation of blowing out, power failure (technology) aborning, does not adopt traditional continuous-feeding and the intermittence or the pulse feeding method that adopt this patent to propose.

2. according to claim 1, the hot stove in airtight (or semi-hermetic) ore deposit comprises all smelting calcium carbides, yellow phosphorus, silicon system (ferrosilicon, silico-calcium, silico-calcium, metallic silicon etc.), manganese system (ferromanganese, silicomanganese, manganese metal etc.), the hot stoves in various airtight (or semi-hermetic) ore deposits such as chromium system or nickel system, molybdenum-iron, ferrotungsten, ferrotianium, the power supply mode of stove can adopt direct current, low-frequency ac, intermediate frequency, any power supply mode of high-frequency ac, at the plasma smelting stove, the sealed furnace of novel energies such as electromagnetism smelting uses this patented technology also in this interest field.Sealed furnace supply transformer inlet wire can adopt three-phase transformer or single-phase transformer, and supply voltage of transformer can be used for 11KV, 35KV, 66KV, 110KV or any electric pressure.Raw material comprises the raw materials for production in any input sealed furnace, such as various smelting reducing agent, carbon material (coke, smokeless carbon coal, fine purifiation coal etc.) and the various ores that are used to smelt and smelt additive and composition thereof.Electrodes in mine hot stove can be self-baking or any electrode of prebake.

3. according to claim 1, the new design of closed submerged stove, furnace of calcium carbide is adopted with produce that back transformation adopts pass through mechanical material loading and annular charger cloth is expected tremie pipe top small feed bin, except that accident and blowing out, adopt any repeatability to be interrupted feed or pulse feed in the production run, comprise that the working of a furnace adopts continuous-feeding just often, adopt during the undesired working of a furnace when lifting on working of a furnace unit consumption height or the electrode and be interrupted or the pulse feed.

4. according to claim 1, the design of closed submerged stove or transform to occur: by increase at more than one tremie pipe non-manually directly various other control raw materials of fracture be added to the valve of closing down in the stove, realize long-rangely or on the spot manually and adopt electronic, jettron valve and control fracture automatically and realize intermittently or the pulse feed, perhaps be interrupted by artificial or machinery that plug tradition inserted link valve is realized or other is equal to and realizes intermittently or the method and apparatus of pulse feeding operation.

5. adopt airtight design according to claim 1 and because in the actual motion because of the sealed furnace of misoperation generation internal combustion or the sealed furnace of using as the semi-hermetic stove, perhaps tremie pipe surpasses 7 semi-hermetic stove, use during ordinary production mechanical material loading and annular material distributing machine material loading and tremie pipe adopts pulse that patent proposed or intermittent feed or the regular stove of discontinuous manner feed.But do not comprise adopting being lower than 6 tremie pipes, do not use annular cloth and the stove that adopts the open stove of tradition vibrations or shake feed and tradition to adopt artificial material casting to feed intake.

6. according to claim 1, from patent announce the back use for reference any sealed furnace, the semi-hermetic stove of the purpose of this patent inventive principle, invention and thinking transformation and produce in change into by mechanical continuous-feeding and to increase charge pipe fracture device or adopt intermittently or the pulse feed-type.