CN102506591B - Dust collection method of gas device by utilizing wet method during baking oven period for large enclosed electric furnace - Google Patents
Dust collection method of gas device by utilizing wet method during baking oven period for large enclosed electric furnace Download PDFInfo
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- CN102506591B CN102506591B CN201110333749.4A CN201110333749A CN102506591B CN 102506591 B CN102506591 B CN 102506591B CN 201110333749 A CN201110333749 A CN 201110333749A CN 102506591 B CN102506591 B CN 102506591B
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Abstract
The invention discloses a dust collection method of a gas device by utilizing a wet method during the baking furnace period for a large enclosed electric furnace, aiming to solve the problem that during the baking furnace period for the large enclosed furnace, fume containing a certain amount of CO and a great amount of dust is emitted to air, and the environment is polluted. The technical scheme is that when the electric furnace is in coke baking and electric baking period, according to the gas production rate of the electric furnace, the air distribution quantity, the furnace door air speed, the overall suction force of the system and the back flow opening of a fan are allocated and controlled reasonably, thus air enters the furnace, CO in the furnace is combusted fully, the fume containing dust in the gas device by a wet method is washed and purified, and finally the fume generated by the electric furnace is emitted out in a clean CO2 mode. According to the invention, a gas recovery and purification device by a wet method matched with the electric furnace is utilized fully, and the opening control of the furnace door of the electric furnace is combined, thus a new function is additionally increased for the traditional dust collection device by a wet method, namely during the baking furnace period of the large enclosed electric furnace, the coal gas dust collection device by a wet method is adopted as a common fume purification device, the contradiction of frequent conditions of furnace observation, frequent operations and coal gas safe operations for an enclosed silicon-manganese electric furnace is treated well, thus the aim of fume purification is achieved; and the purification of fume during the baking furnace period is realized, and the danger to environment by dust and CO is reduced.
Description
Technical field
The present invention relates to utilize between a kind of large-scale closed electric furnace drying-out period the dust collection method of wet method gas fittings, be applicable to the large-scale closed electric furnace that adopts wet method coal gas to gather dust, open type drops into the technology of gas wet dust collection device operation during blow-on again during the coke baker before operation, electric oven and after electric furnace maintenance.
Background technology
The two kinds of methods of having gathered dust of large-scale closed electric furnace, a kind of is dry-method gas recovery process, another kind is wet method coal-gas recovering technique.Wet method coal-gas recovering process for purifying, between drying-out period, technical staff need to watch electrode sintering at any time, and smelter need to supplement coke at any time, meanwhile, for moisture in stove is discharged, needs to open wide fire door.Be subject to the requirement of wet method gas safety technology, between large-scale closed electric furnace drying-out period, traditional way is: wet method coal-gas recovering equipment is out of service, flue gas between electric furnace drying-out period is had to directly by air flue emission in air, wherein contain a certain amount of CO and a large amount of dust, production site operation environment and periphery resident's living environment has been brought to very adverse influence.
Summary of the invention
Technical problem to be solved by this invention is to provide the dust collection method that utilizes wet method gas fittings between a kind of large-scale closed electric furnace drying-out period, with solve between large-scale closed electric furnace drying-out period by contain a certain amount of CO and a large amount of dust flue gas directly by air flue emission in air, the problem that environment is worked the mischief.
Technical solution of the present invention is:
The dust collection method that utilizes wet method gas fittings between large-scale closed electric furnace drying-out period, its special character is:
1, between large-scale airtight silicomanganese electric furnace drying-out period, the operation of normally going into operation of the wet method coal-gas recovering cleaning equipment of supporting installation;
2, during burnt baking:
Three large fire doors 1,2,3 that electric furnace is relative with three-phase electrode are completely unlimited, so that smelter adds coke or processing " outstanding carbon " problem from fire door to three-phase electrode 8, being positioned at the port door section that three-phase electrode 8 is alternate opens, so that operating personnel insert compressed air tube connector from fire door, carry out oxygen blast at any time, other fire door is closed; In the process of drying Jiao, technical staff need to be according to flue gas output, theoretical air distribution amount, three parameters of fire door wind speed during the burnt baking of different electric furnaces, control at any time aperture, blower fan backflow aperture, the total suction parameter of system of each fire door, to guarantee that the air amount of being mixed meets coke burning needs, and leave surplus; Wherein, air distribution amount, fire door wind speed are according to the theoretical parameter that between drying-out period, flue gas output obtains, blower fan backflow aperture, the total suction of system and fire door aperture, and the parameter that can regulate at any time while being baker, concrete technical parameter is controlled as follows:
Electric furnace gas production: 800～2400m
3/ h increases gradually within the scope of this;
Air distribution amount: 1800～6500m
3/ h, increases with exhaust gas volumn, is increase trend;
Fire door wind speed: 0.05 ~ 0.45m/s, along with the increase of exhaust gas volumn, presents and reduces gradually trend;
The total suction of system: 3500～6400Pa, along with the increase of exhaust gas volumn, is rising trend;
Blower fan backflow aperture: 35～45%, along with the total suction of system increases, be and reduce trend;
The alternate fire door aperture of three-phase electrode: 20～45%, along with the increase of air distribution amount, present the whole trend increasing;
3, during electric oven:
During electric oven, the large fire door 2,3 that the port door 5 relative with electric furnace flue and 2 electrodes at interval thereof are relative opens wide, so that technical staff watches electrode and the working of a furnace, all the other fire doors are closed, but simultaneously according to the variation of CO concentration in the different phase flue gas output of baker and flue gas thereof, find suitable theoretical air distribution amount and theoretical fire door wind speed, and according to these two parameters, regulate at any time aperture, blower fan backflow aperture, the total suction parameter of system of each fire door, guarantee that the air entering from fire door can allow the CO in stove fully burn; Other fire door Close All, ash-laden gas is washed purification in wet method gas fittings, and the flue gas that final electric furnace produces is with clean CO
2form emit, the technology in electric oven stage is controlled, according to the concentration of CO in the flue gas output of different phase and flue gas, allocate the air of theoretical amount into, both guaranteed CO fully burning in burner hearth, guarantee that again the flow velocity of mist in burner hearth is in theoretical control range, concrete technical parameter is controlled as follows:
During electric oven:
Electric furnace gas production: 1000～4000m
3/ h, main trend increases gradually, occurs among a small circle fluctuation;
Air distribution amount: 3000～9000m
3/ h, increases with exhaust gas volumn, is increase trend;
Fire door wind speed: 0.8 ~ 0.25m/s, along with the increase of exhaust gas volumn, presents and reduces gradually trend;
The total suction of system: 3500～11000Pa, along with exhaust gas volumn, is rising trend;
Blower fan backflow aperture: 30～10%, along with the total suction of system increases, be and reduce trend;
The aperture of the relative fire door 1,2,3 of three-phase electrode, from 30～100%, along with the increase of air distribution amount, and increases gradually.
Between above-mentioned large-scale closed electric furnace drying-out period, utilize the dust collection method of wet method gas fittings, the relative fire door aperture of three-phase electrode during electric oven, all presents the whole trend increasing with the increase of air distribution amount, is manual control stage by stage in control procedure.
The present invention adopts existing gas wet dust collection device, the open type method of operation, make full use of the supporting wet method coal-gas recovering cleaning equipment of electric furnace, aperture in conjunction with electric stove door is controlled, make traditional wet dust collector equipment many again a new purposes, between large-scale closed electric furnace drying-out period, gas wet dust collection device is used as to common flue gas purifying equipment, well processed between airtight silicomanganese electric furnace drying-out period and frequently watched the contradiction between the working of a furnace, frequent operation and safety operation of gas, reached the object of gas cleaning.Realized the purification of flue gas between drying-out period, the exhaust gas dust content after purification can reach 50～100mg/m
3, CO content≤30ppm, has obviously reduced dust and the CO harm to environment, has improved operating environment between drying-out period and periphery resident's living environment.
Accompanying drawing explanation
Fig. 1 is the structural representation of 30000KVA silicomanganese electric furnace of the present invention;
Fig. 2 is the electric furnace gas production variation tendency schematic diagram during burnt baking in the embodiment of the present invention 1;
Fig. 3 is the air distribution amount variation tendency schematic diagram during burnt baking in the embodiment of the present invention 1;
Fig. 4 is the fire door wind speed variation tendency schematic diagram during burnt baking in the embodiment of the present invention 1;
Fig. 5 is the total suction variation tendency of the system schematic diagram during burnt baking in the embodiment of the present invention 1;
Fig. 6 is that in the embodiment of the present invention 1, the blower fan backflow aperture during burnt baking is controlled variation tendency schematic diagram;
Fig. 7 is that in the embodiment of the present invention 1, the alternate fire door aperture of three-phase electrode during burnt baking is controlled variation tendency schematic diagram;
Fig. 8 is the electric furnace gas production variation tendency schematic diagram during electric oven in the embodiment of the present invention 1;
Fig. 9 is the air distribution amount variation tendency schematic diagram during electric oven in the embodiment of the present invention 1;
Figure 11 is the fire door wind speed variation tendency schematic diagram during electric oven in the embodiment of the present invention 1;
Figure 11 is the total suction variation tendency of the system during electric oven schematic diagram in the embodiment of the present invention 1;
Figure 12 is that in the embodiment of the present invention 1, the blower fan backflow aperture during electric oven is controlled variation tendency schematic diagram;
Figure 13 is that in the embodiment of the present invention 1, the alternate fire door aperture of the three-phase electrode during electric oven is controlled variation tendency schematic diagram;
Figure 14 is the electric furnace gas production variation tendency schematic diagram during burnt baking in the embodiment of the present invention 2;
Figure 15 is the air distribution amount variation tendency schematic diagram during burnt baking in the embodiment of the present invention 2;
Figure 16 is the fire door wind speed variation tendency schematic diagram during burnt baking in the embodiment of the present invention 2;
Figure 17 is the total suction variation tendency of the system schematic diagram during burnt baking in the embodiment of the present invention 2;
Figure 18 is that in the embodiment of the present invention 2, the blower fan backflow aperture during burnt baking is controlled variation tendency schematic diagram;
Figure 19 is that in the embodiment of the present invention 2, the alternate fire door aperture of three-phase electrode during burnt baking is controlled variation tendency schematic diagram;
Figure 20 is the electric furnace gas production variation tendency schematic diagram during electric oven in the embodiment of the present invention 2;
Figure 21 is the air distribution amount variation tendency schematic diagram during electric oven in the embodiment of the present invention 2;
Figure 22 is the fire door wind speed variation tendency schematic diagram during electric oven in the embodiment of the present invention 2;
Figure 23 is the total suction variation tendency of the system during electric oven schematic diagram in the embodiment of the present invention 2;
Figure 24 is that in the embodiment of the present invention 2, the blower fan backflow aperture during electric oven is controlled variation tendency schematic diagram;
Figure 25 is that in the embodiment of the present invention 2, the alternate fire door aperture of the three-phase electrode during electric oven is controlled variation tendency schematic diagram;
Figure 26 is the electric furnace gas production variation tendency schematic diagram during burnt baking in the embodiment of the present invention 3;
Figure 27 is the air distribution amount variation tendency schematic diagram during burnt baking in the embodiment of the present invention 3;
Figure 28 is the fire door wind speed variation tendency schematic diagram during burnt baking in the embodiment of the present invention 3;
Figure 29 is the total suction variation tendency of the system schematic diagram during burnt baking in the embodiment of the present invention 3;
Figure 30 is that in the embodiment of the present invention 3, the blower fan backflow aperture during burnt baking is controlled variation tendency schematic diagram;
Figure 31 is that in the embodiment of the present invention 3, the alternate fire door aperture of three-phase electrode during burnt baking is controlled variation tendency schematic diagram;
Figure 32 is the electric furnace gas production variation tendency schematic diagram during electric oven in the embodiment of the present invention 3;
Figure 33 is the air distribution amount variation tendency schematic diagram during electric oven in the embodiment of the present invention 3;
Figure 34 is the fire door wind speed variation tendency schematic diagram during electric oven in the embodiment of the present invention 3;
Figure 35 is the total suction variation tendency of the system during electric oven schematic diagram in the embodiment of the present invention 3;
Figure 36 is that in the embodiment of the present invention 3, the blower fan backflow aperture during electric oven is controlled variation tendency schematic diagram;
Figure 37 is that in the embodiment of the present invention 3, the alternate fire door aperture of the three-phase electrode during electric oven is controlled variation tendency schematic diagram.
In figure: 1,2, large fire door that 3-electric furnace is relative with three-phase electrode, 4,5, little fire door that 6--three-phase electrode is alternate, 7-flue, 8-three-phase electrode.
The specific embodiment
As shown in Figure 1, concrete operations are as follows:
1, between the large-scale airtight silicomanganese electric furnace drying-out period of 30000KVA, the operation of normally going into operation of the wet method coal-gas recovering cleaning equipment of supporting installation;
2, during burnt baking:
Three large fire doors 1,2,3 that electric furnace is relative with three-phase electrode are completely unlimited, smelter adds the problems such as coke or processing " outstanding carbon " from fire door to three-phase electrode 8, being positioned at the port door 4,5,6 that three-phase electrode 8 is alternate partially opens, operating personnel by compressed air tube connector respectively from inserting with alternate 4,5, the 6 port doors of electrode, carry out continuous oxygen blast, other fire door is closed; In the process of drying Jiao, technical staff need to be according to flue gas output, theoretical air distribution amount, three parameters of fire door wind speed during the burnt baking of different electric furnaces, control at any time aperture, blower fan backflow aperture, the total suction parameter of system of each fire door, to guarantee that the air amount of being mixed meets coke burning needs, and leave surplus.Wherein, air distribution amount, fire door wind speed are according to the theoretical parameter that between drying-out period, flue gas output obtains, blower fan backflow aperture, the total suction of system and fire door aperture, and the parameter that can regulate at any time while being baker, concrete technical parameter is controlled as follows:
Electric furnace gas production: 860～2350m
3/ h increases gradually within the scope of this, and the trend of increase as shown in Figure 2;
Air distribution amount: 1900～6000m
3/ h, increases with exhaust gas volumn, is increase trend, and the trend of increase as shown in Figure 3;
Fire door wind speed: 0.08 ~ 0.4m/s, along with the increase of exhaust gas volumn, presents and reduces gradually trend, and the trend reducing as shown in Figure 4;
The total suction of system: 3900～6200Pa, along with the increase of exhaust gas volumn, is rising trend, and the trend of increase as shown in Figure 5;
Blower fan backflow aperture: 35～44%, along with the total suction of system increases, be and reduce trend, the trend reducing is as shown in Figure 6;
The alternate fire door aperture of three-phase electrode: 25～45%, along with the increase of air distribution amount, increase gradually and control by stages aperture, the trend of increase is as shown in Figure 7;
3, during electric oven:
During electric oven, the large fire door 2,3 that the port door 5 relative with electric furnace flue and 2 electrodes at interval thereof are relative opens wide, technical staff watches electrode and the working of a furnace, all the other fire doors are closed, but simultaneously according to the variation of CO concentration in the different phase flue gas output of baker and flue gas thereof, find suitable theoretical air distribution amount and theoretical fire door wind speed, and according to these two parameters, regulate at any time aperture, blower fan backflow aperture, the total suction parameter of system of each fire door, guarantee that the air entering from fire door can allow the CO in stove fully burn; Other fire door Close All, ash-laden gas is washed purification in wet method gas fittings, and the flue gas that final electric furnace produces is with clean CO
2form emit.The technology in electric oven stage is controlled, be according to the concentration of CO in the flue gas output of different phase and flue gas, allocate the air of theoretical amount into, both guaranteed CO fully burning in burner hearth, guarantee that again the flow velocity of mist in burner hearth is in theoretical control range, concrete technical parameter is controlled as follows:
Electric furnace gas production: 1020～3600m
3/ h, main trend increases gradually, occurs among a small circle fluctuation, and the trend of increase is as shown in Figure 8;
Air distribution amount: 3300～7500m
3/ h, increases with exhaust gas volumn, is increase trend, and the trend of increase as shown in Figure 9;
Fire door wind speed: 0.8 ~ 0.25m/s, along with the increase of exhaust gas volumn, presents and reduces gradually trend, and the trend reducing as shown in figure 10;
The total suction of system: 3600～11000Pa, along with the increase of exhaust gas volumn, is rising trend, and the trend of increase as shown in figure 11;
Blower fan backflow aperture: 30～10%, along with the total suction of system increases, be and reduce trend, the trend reducing is as shown in figure 12;
The aperture of the relative fire door 1,2,3 of three-phase electrode: from 35～100%, along with the increase of air distribution amount, increase gradually and control by stages aperture, the trend of increase as shown in figure 13.
Embodiment 2
As shown in Figure 1, concrete operations are as follows:
1, between the large-scale airtight silicomanganese electric furnace drying-out period of 30000KVA, the operation of normally going into operation of the wet method coal-gas recovering cleaning equipment of supporting installation;
2, during burnt baking:
Three large fire doors 1,2,3 that electric furnace is relative with three-phase electrode are completely unlimited, smelter adds the problems such as coke or processing " outstanding carbon " from fire door to three-phase electrode 8, other partially opens at the alternate port door 4,5,6 of three-phase electrode 8, operating personnel by compressed air tube connector respectively from inserting with alternate 4,5, the 6 port doors of electrode, carry out continuous oxygen blast, other fire door is closed; In the process of drying Jiao, technical staff need to be according to flue gas output, theoretical air distribution amount, three parameters of fire door wind speed during the burnt baking of different electric furnaces, control at any time aperture, blower fan backflow aperture, the total suction parameter of system of each fire door, to guarantee that the air amount of being mixed meets coke burning needs, and leave surplus.Wherein, air distribution amount, fire door wind speed are according to the theoretical parameter that between drying-out period, flue gas output obtains, blower fan backflow aperture, the total suction of system and fire door aperture, and the parameter that can regulate at any time while being baker, concrete technical parameter is controlled as follows:
Electric furnace gas production: 900～2400m
3/ h increases gradually within the scope of this, and the trend of increase as shown in figure 14;
Air distribution amount: 2100～6500m
3/ h, increases with exhaust gas volumn, is increase trend, and the trend of increase as shown in figure 15;
Fire door wind speed: 0.05 ~ 0.40m/s, along with the increase of exhaust gas volumn, presents and reduces gradually trend, and the trend reducing as shown in figure 16;
The total suction of system: 4100～6400Pa, along with the increase of exhaust gas volumn, is rising trend, and the trend of increase as shown in figure 17;
Blower fan backflow aperture: 35～41%, along with the total suction of system increases, be and reduce trend, the trend reducing is as shown in figure 18;
The alternate fire door aperture of three-phase electrode: 30～45%, along with the increase of air distribution amount, increase gradually, and control by stages aperture, the trend of increase is as shown in figure 19;
3, during electric oven:
During electric oven, the large fire door 2,3 that the port door 5 relative with electric furnace flue and 2 electrodes at interval thereof are relative opens wide, technical staff watches electrode and the working of a furnace, all the other fire doors are closed, but simultaneously according to the variation of CO concentration in the different phase flue gas output of baker and flue gas thereof, find suitable theoretical air distribution amount and theoretical fire door wind speed, and according to these two parameters, regulate at any time aperture, blower fan backflow aperture, the total suction parameter of system of each fire door, guarantee that the air entering from fire door can allow the CO in stove fully burn; Other fire door Close All, ash-laden gas is washed purification in wet method gas fittings, and the flue gas that final electric furnace produces is with clean CO
2form emit.The technology in electric oven stage is controlled, be according to the concentration of CO in the flue gas output of different phase and flue gas, allocate the air of theoretical amount into, both guaranteed CO fully burning in burner hearth, guarantee that again the flow velocity of mist in burner hearth is in theoretical control range, concrete technical parameter is controlled as follows:
Electric furnace gas production: 1100～4000m
3/ h, main trend increases gradually, occurs among a small circle fluctuation, and the trend of increase is as shown in figure 20;
Air distribution amount: 3100～9000m
3/ h, increases with exhaust gas volumn, is increase trend, and the trend of increase as shown in figure 21;
Fire door wind speed: 0.7 ~ 0.25m/s, along with the increase of exhaust gas volumn, presents and reduces gradually trend, and the trend reducing as shown in figure 22;
The total suction of system: 3800～11000Pa, along with the increase of exhaust gas volumn, is rising trend, and the trend of increase as shown in figure 23;
Blower fan backflow aperture: 28～10%, along with the total suction of system increases, be and reduce trend, the trend reducing is as Figure 24 institute;
The aperture of the relative fire door 1,2,3 of three-phase electrode: from 30～90%, along with the increase of air distribution amount, increase gradually aperture, the trend of increase as shown in figure 25.
Embodiment 3
As shown in Figure 1, concrete operations are as follows:
1, between large-scale airtight 66KV silicomanganese electric furnace drying-out period, the operation of normally going into operation of the wet method coal-gas recovering cleaning equipment of supporting installation;
2, during burnt baking:
Three large fire doors 1,2,3 that electric furnace is relative with three-phase electrode are completely unlimited; smelter adds the problems such as coke or processing " outstanding carbon " from fire door to three-phase electrode 8; other partially opens at the alternate port door 4,5,6 of three-phase electrode 8; operating personnel by compressed air tube connector respectively from inserting with alternate 4,5, the 6 port doors of electrode; carry out continuous oxygen blast, other fire door is closed; In the process of drying Jiao, technical staff need to be according to flue gas output, theoretical air distribution amount, three parameters of fire door wind speed during the burnt baking of different electric furnaces, control at any time aperture, blower fan backflow aperture, the total suction parameter of system of each fire door, to guarantee that the air amount of being mixed meets coke burning needs, and leave surplus.Concrete technical parameter is controlled as follows:
Electric furnace gas production: 800～2300m
3/ h increases gradually within the scope of this, and the trend of increase as shown in figure 26;
Air distribution amount: 1800～5800m
3/ h, increases with exhaust gas volumn, is increase trend, and the trend of increase as shown in figure 27;
Fire door wind speed: 0.10 ~ 0.45m/s, along with the increase of exhaust gas volumn, presents and reduces gradually trend, and the trend reducing as shown in figure 28;
The total suction of system: 3500～6000Pa, along with the increase of exhaust gas volumn, is rising trend, and the trend of increase as shown in figure 29;
Blower fan backflow aperture: 37～45%, along with the total suction of system increases, be and reduce trend, the trend reducing is as shown in figure 30;
The alternate fire door aperture of three-phase electrode: 20～40%, along with the increase of air distribution amount, increase gradually aperture, the trend of increase is as shown in figure 31;
3, during electric oven:
During electric oven, the large fire door 2,3 that the port door 5 relative with electric furnace flue and 2 electrodes at interval thereof are relative opens wide, technical staff watches electrode and the working of a furnace, all the other fire doors are closed, but simultaneously according to the variation of CO concentration in the different phase flue gas output of baker and flue gas thereof, find suitable theoretical air distribution amount and theoretical fire door wind speed, and according to these two parameters, regulate at any time aperture, blower fan backflow aperture, the total suction parameter of system of each fire door, guarantee that the air entering from fire door can allow the CO in stove fully burn; Other fire door Close All, ash-laden gas is washed purification in wet method gas fittings, and the flue gas that final electric furnace produces is with clean CO
2form emit.Concrete technical parameter is controlled as follows:
Electric furnace gas production: 1000～3800m
3/ h, main trend increases gradually, occurs among a small circle fluctuation, and the trend of increase is shown in figure 32;
The air amount of allocating into: 3000～8100m
3/ h, increases with exhaust gas volumn, is increase trend, and the trend of increase as shown in figure 33;
Fire door wind speed: 0.8 ~ 0.23m/s, along with the increase of exhaust gas volumn, presents and reduces gradually trend, and the trend reducing as shown in figure 34;
The total suction of system: 3500～10500Pa, along with the increase of exhaust gas volumn, is rising trend, and the trend of increase as shown in figure 35;
Blower fan backflow aperture: 30～15%, along with the total suction of system increases, be and reduce trend, the trend reducing is as shown in figure 36;
The aperture of the relative fire door 1,2,3 of three-phase electrode: from 30～90%, along with the increase of air distribution amount, increase gradually aperture, the trend of increase as shown in figure 37.
Claims (2)
1. between large-scale closed electric furnace drying-out period, utilize a dust collection method for wet method gas fittings, it is characterized in that:
1.1 between large-scale airtight silicomanganese electric furnace drying-out period, the operation of normally going into operation of the wet method gas fittings of supporting installation;
During 1.2 burnt bakings:
Three large fire doors that electric furnace is relative with three-phase electrode are completely unlimited, so that smelter adds coke or processing " outstanding carbon " problem from large fire door to three-phase electrode, being positioned at the port door section that three-phase electrode is alternate opens, so that operating personnel insert compressed air tube connector from port door, carry out oxygen blast at any time, other fire door is closed; In the process of drying Jiao, technical staff need to be according to electric furnace gas production, theoretical air distribution amount, three parameters of theoretical fire door wind speed during the burnt baking of different electric furnaces, control at any time aperture, blower fan backflow aperture, the total suction parameter of system of each fire door, to guarantee that the air amount of being mixed meets coke burning needs, and leave surplus; Wherein, theoretical air distribution amount, theoretical fire door wind speed are according to the theoretical parameter that between drying-out period, electric furnace gas production obtains, blower fan backflow aperture, the total suction of system and fire door aperture, and the parameter that can regulate at any time while being baker, concrete technical parameter is controlled as follows:
Electric furnace gas production: 800～2400m
3/ h increases gradually within the scope of this;
Theoretical air distribution amount: 1800～6500m
3/ h, increases with electric furnace gas production, is increase trend;
Theoretical fire door wind speed: 0.05 ~ 0.45m/s, along with the increase of electric furnace gas production, presents and reduce gradually trend;
The total suction of system: 3500～6500Pa, the increase along with electric furnace gas production and theoretical air distribution amount, is rising trend;
Blower fan backflow aperture: 35～45%, along with the total suction of system increases, be and reduce trend;
The port door aperture that three-phase electrode is alternate: 20～45%, along with the increase of electric furnace gas production and theoretical air distribution amount, present the whole trend increasing;
During 1.3 electric ovens:
During electric oven, the large fire door that the little fire door relative with electric furnace flue and 2 electrodes at interval thereof are relative opens wide, so that technical staff watches electrode and the working of a furnace, all the other fire doors are closed, but simultaneously according to the variation of CO concentration in the different phase electric furnace gas production of baker and flue gas thereof, find suitable theoretical air distribution amount and theoretical fire door wind speed, and according to these two parameters, regulate at any time aperture, blower fan backflow aperture, the total suction parameter of system of each fire door, guarantee that the air entering from fire door can allow the CO in stove fully burn; Other fire door Close All, ash-laden gas is washed purification in wet method gas fittings, and the flue gas that final electric furnace produces is with clean CO
2form emit, the technology in electric oven stage is controlled, according to the concentration of CO in the electric furnace gas production of different phase and flue gas, allocate the air of theoretical amount into, both guaranteed CO fully burning in burner hearth, guarantee that again the flow velocity of mist in burner hearth is in theoretical control range, concrete technical parameter is controlled as follows:
During electric oven:
Electric furnace gas production: 1000m
3/ h～4000m
3/ h, main trend increases gradually, occurs among a small circle fluctuation;
Theoretical air distribution amount: 3000～9000m
3/ h, increases with electric furnace gas production, is increase trend;
Theoretical fire door wind speed: 0.8 ~ 0.25m/s, along with the increase of electric furnace gas production, presents and reduce gradually trend;
The total suction of system: 3500～11000Pa, along with electric furnace gas production, is rising trend;
Blower fan backflow aperture: 30～10%, along with the total suction of system increases, be and reduce trend;
The relative large fire door aperture of three-phase electrode, from 20～100%, along with the increase of theoretical air distribution amount, and increases gradually.
2. between large-scale closed electric furnace drying-out period according to claim 1, utilize the dust collection method of wet method gas fittings, it is characterized in that: the relative large fire door aperture of three-phase electrode during electric oven, all with the increase of theoretical air distribution amount, present the whole trend increasing, be manual control stage by stage in control procedure.
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