CN217005348U - Novel flame path for aluminum electrolysis prebaked anode roasting furnace - Google Patents

Abstract

The utility model discloses a novel flame path for an aluminum electrolysis pre-baked anode roasting furnace, which comprises a flame path box, wherein the flame path box is assembled on the outer side wall of a roasting furnace flame path wall, the flame path box is assembled by four plates, namely a left side wall, a bottom plate, a right side wall and a main body plate, a cover plate positioned at the tops of the four plates is also arranged in a burner nozzle hole, and a smoke inlet groove positioned at the top end of the left side wall is formed in the flame path box; this novel flame path for aluminium electroloysis prebaked anode roasting furnace through the setting of the inboard first upper partition wall of flame path case, partition wall, third upper partition wall, left lower partition wall and right lower partition wall and position, compare in 3 traditional partition wall roasting furnaces, has prolonged the route of flame in the flame path, makes the more abundant absorbed heat of goods, and exhaust gas temperature is less than 140 ℃, and energy-conserving effect is obvious, according to understanding, the exhaust gas temperature of the roasting furnace of three traditional partition walls is about 250 ℃, and exhaust gas temperature every improves 10 ℃, and natural gas combustion efficiency reduces 1%.

Description

Novel flame path for aluminum electrolysis prebaked anode roasting furnace

Technical Field

The utility model relates to the technical field of roasting furnace flame paths, in particular to a novel flame path for an aluminum electrolysis prebaked anode roasting furnace.

Background

The prebaked anode is made of petroleum coke and pitch coke as aggregates and coal pitch as a binder and is used as an anode material of a prebaked aluminum electrolytic cell. The carbon block has been roasted and has a stable geometry, so the carbon block is also called as a prebaked anode carbon block and is also called as a carbon anode for aluminum electrolysis in a conventional way. An aluminum electrolytic cell using prebaked anode carbon blocks as anodes is called a prebaked anode electrolytic cell, which is called a prebaked cell for short, and is a modern large-scale aluminum electrolytic cell. The existing prebaked anode is easy to try harmful flue gas in the baking process. Harmful flue gas Yayao is desulfurized, sodium sulfite by-products generated in the desulfurization process can be oxidized to generate sodium sulfate, the regeneration capability of the sodium sulfate by lime slurry is poor, longer reaction time and harsher reaction conditions are required, and the regeneration rate is less than 30% under common industrial operation conditions.

Therefore, the roasting furnace needs to be matched with a flame path for flue gas treatment, the existing combustion method is generally adopted and comprises an in-furnace combustion method and an out-furnace combustion method, the flue gas is combusted by the existing in-furnace combustion method, meanwhile, a corresponding stainless steel treatment structure needs to be additionally matched, the manufacturing cost is high, and meanwhile, the mode of the out-furnace combustion treatment is generally difficult to control in temperature, so that incomplete combustion is easy to occur, and the condition that partial incompletely combusted flue gas is discharged to the atmosphere to cause pollution is caused.

Therefore, we propose a new type of flame path for aluminum electrolysis prebaked anode baking furnace.

SUMMERY OF THE UTILITY MODEL

Technical problem to be solved

Aiming at the defects of the prior art, the utility model provides a novel flame path for an aluminum electrolysis prebaked anode roasting furnace, which solves the problems of incomplete combustion flue gas outside the furnace and high manufacturing cost.

(II) technical scheme

In order to realize the purpose, the utility model is realized by the following technical scheme: a novel flame path for an aluminum electrolysis prebaked anode roasting furnace comprises a flame path box, wherein the flame path box is assembled on the outer side wall of a roasting furnace flame path wall, the flame path box is formed by assembling four plates of a left side wall, a bottom plate, a right side wall and a main body plate, a cover plate positioned at the tops of the four plates is further arranged in a burner hole, a smoke inlet groove positioned at the top end of the left side wall is formed in the flame path box, a smoke exhaust groove which is opposite to the smoke inlet groove in the left side wall and positioned at the top end of the right side wall is further arranged on the outer wall of the flame path box, a first upper partition wall, a second upper partition wall and a third upper partition wall which have the same specification are assembled on the inner side of the flame path box, the first upper partition wall, the second upper partition wall and the third upper partition wall have the same interval and are fixedly connected on the bottom surface of the main body plate in the flame path box, the left lower partition wall and the right lower partition wall are assembled on the inner side of the flame path box, and the bottom ends of the left lower partition wall and the right lower partition wall are fixedly connected to the top surface of the bottom plate at the inner side of the flame path box.

Preferably, fixed mounting has the flue that advances that is located the left side wall top and advances the flue outside of smoke groove on the outer wall of flame path case, still be equipped with the discharge flue that is located the right side wall top and arranges the flue outside of smoke groove on the outer wall of flame path case, be equipped with the shrouding on the discharge flue, and advance and be equipped with the sleeve that is linked together with the tobacco pipe on the flue.

Preferably, a pavement precast block positioned at the top is fixedly installed on the outer wall of the flame path box, six groups of burner holes are assembled in the pavement precast block, and the bottom ends of the burner holes are communicated with the inner cavity of the flame path box.

Preferably, fixed mounting has the high aluminium that is located the first upper dividing wall and the second upper dividing wall outside to pull a brick group on the inner wall of flame path case, and all is equipped with three high aluminium that the interval is the same in every high aluminium of group pulls a brick group and draws a brick.

Preferably, the inboard fixed mounting of flame path case has the cigarette piece of leading that is located into the flue and the discharge flue outside, partition wall, left lower partition wall and right lower partition wall all are equipped with between partition wall and the flame path incasement lateral wall on first upper partition wall, the second and lead the cigarette piece, and the inboard flue gas circulation direction of flame path incasement is followed and is led the cigarette piece and advance.

(III) advantageous effects

The utility model provides a novel flame path for an aluminum electrolysis prebaked anode roasting furnace. The method has the following beneficial effects:

1. this novel flame path for aluminium electroloysis prebaked anode roasting furnace, through the setting of the inboard first partition wall of flame path case, partition wall on the second, partition wall on the third, partition wall under left side and the partition wall and position under the right side, compare in 3 traditional partition wall roasting furnaces, the route of flame in the flame path has been prolonged, make the more abundant absorbed heat of goods, exhaust gas temperature is less than 140 ℃, energy-conserving effect is obvious, according to understanding, the exhaust gas temperature of the roasting furnace of traditional three partition walls is about 250 ℃, exhaust gas temperature improves 10 ℃ every time, natural gas combustion efficiency reduces 1%.

2. After the path of flame in the flame path is prolonged, compared with the operation of the traditional roasting process, the flame path for the novel aluminum electrolysis prebaked anode roasting furnace increases the temperature difference between the flame path and the product, can ensure that the temperature of the product can reach 560 plus 580 ℃ at the initial stage of the volatile matter overflow of 180-200 ℃, and reaches above the ignition temperature of the volatile matter (asphalt smoke), so that the asphalt smoke can be fully combusted in the flame path, once the asphalt smoke is combusted, the temperature of combustion flame is inevitably above 780 ℃, and the requirement of the combustion temperature for the decomposition of the asphalt smoke is met. Due to the fact that the temperature difference is increased, the overflow amount of volatile components is relatively reduced, the volatile components overflow in a step-by-step manner, the layers are clear, and the combustion is sufficient; in this state, the company adopts a three-chamber six-electric field electrical tar precipitator for flue gas treatment, the 1-2-4-5 electric field has slight tar, and the 3 and 6 electric fields are from application to no tar; the facility operates stably, the monitoring index is always kept in a stable and qualified state after the flue gas is treated, and the problem of insufficient combustion of the flue gas combusted outside the furnace is solved.

Drawings

FIG. 1 is a schematic view of the structure of the present invention;

FIG. 2 is a side view of the present invention;

FIG. 3 is a schematic view of the inner side of the present invention;

FIG. 4 is a schematic diagram of the present invention viewed obliquely from the inside.

In the figure: 1. a flame path box; 2. a flame path wall of the roasting furnace; 3. furnace surface precast blocks; 4. a burner orifice; 5. entering a flue; 6. a discharge flue; 7. a left side wall; 8. a right side wall; 9. a first upper partition wall; 10. a second upper partition wall; 11. a third upper partition wall; 12. a left lower partition wall; 13. a right lower partition wall; 14. a base plate; 15. a main body plate.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.

Referring to fig. 1-4, an embodiment of the utility model provides a technical solution: a novel flame path for an aluminum electrolysis prebaked anode roasting furnace comprises a flame path box 1, wherein the flame path box 1 is assembled on the outer side wall of a roasting furnace flame path wall 2, the flame path box 1 is formed by assembling four plates of a left side wall 7, a bottom plate 14, a right side wall 8 and a main body plate 15, a cover plate positioned at the top of the four plates is further arranged in a burner hole 4, a smoke inlet groove positioned at the top end of the left side wall 7 is formed in the flame path box 1, a smoke exhaust groove which is opposite to the smoke inlet groove position of the left side wall 7 and positioned at the top end of the right side wall 8 is further arranged on the outer wall of the flame path box 1, a first upper partition wall 9, a second upper partition wall 10 and a third upper partition wall 11 which have the same specification are assembled on the inner side of the flame path box 1, the first upper partition wall 9, the second upper partition wall 10 and the third upper partition wall 11 have the same interval and are fixedly connected to the bottom surface of the main body plate 15 on the inner side of the flame path box 1, and the inner side of the flame path box 1 is assembled with the first upper partition wall 9, the second upper partition wall 10 and the second partition wall 11, A left lower partition wall 12 and a right lower partition wall 13 between the second upper partition wall 10 and the third upper partition wall 11, and the bottom ends of the left lower partition wall 12 and the right lower partition wall 13 are fixedly connected to the top surface of a bottom plate 14 at the inner side of the flue box 1;

in the present embodiment, it should be added that, the flame path for the flame in the flame path is extended through the arrangement of the first upper partition wall 9, the second upper partition wall 10, the third upper partition wall 11, the left lower partition wall 12, the right lower partition wall 13 and the positions thereof inside the flame path box 1, compared with the traditional 3 partition wall roasting furnace, so that the product absorbs heat more sufficiently, the exhaust temperature is lower than 140 ℃, the energy saving effect is obvious, and it is understood that the exhaust temperature of the traditional three partition wall roasting furnace is about 250 ℃, and the natural gas combustion efficiency is reduced by 1% when the exhaust temperature is increased by 10 ℃.

In this embodiment, it should be added that the outer wall of the flue box 1 is fixedly provided with a flue inlet 5 located outside the flue inlet slot at the top of the left side wall 7, the outer wall of the flue box 1 is also provided with a flue outlet 6 located outside the flue outlet slot at the top of the right side wall 8, the flue outlet 6 is provided with a sealing plate, and the flue inlet 5 is provided with a sleeve communicated with the flue pipe;

wherein, what advance flue 5 and discharge flue 6 is convenient for carry the flue gas to the flame path case 1 inboard and handle, and the setting of shrouding is convenient for regulate and control the flue gas emission, and the telescopic setting is convenient for carry the flue gas of roasting furnace output to the flame path case 1 inboard through advancing flue 5 and handle on advancing flue 5.

In this embodiment, it should be added that a road surface precast block 3 located at the top of the main body plate 15 is fixedly installed on the outer wall of the flame path box 1, six groups of burner holes 4 are installed in the road surface precast block 3, and the bottom ends of the burner holes 4 are communicated with the inner cavity of the flame path box 1.

In this embodiment, it should be added that three groups of high alumina bricks with the same spacing are fixedly installed on the inner wall of the flue box 1 and are located outside the first upper partition wall 9 and the second upper partition wall 10, and each group of high alumina brick groups is equipped with three high alumina bricks with the same spacing.

In this embodiment, it should be added that a smoke guide block located outside the flue 5 and the flue 6 is fixedly installed inside the flue box 1, the smoke guide blocks are installed between the first upper partition wall 9, the second upper partition wall 10, the third upper partition wall 11, the left lower partition wall 12, the right lower partition wall 13 and the inner side wall of the flue box 1, and the smoke flowing direction inside the flue box 1 travels along the smoke guide block.

In addition, it should be added that the comparison between the external combustion and the internal combustion flue gas treatment facility:

under the operating environment that the volatile matter can not fully burn, the flue gas treatment facility of long-term operation can reduce treatment efficiency, and even flue gas treatment equipment became invalid. In this state, in order to enable the overflowed asphalt smoke to be fully combusted for the second time and reduce pollutants, a professional flue gas treatment facility design and construction unit has launched supporting process equipment (RTO) for combusting asphalt smoke outside the furnace, which is really nothing. The amount of flue gas to be treated is 26 km³The investment of flue gas treatment equipment (working condition) is more than 2500 ten thousand yuan, and the flue gas treatment equipment is matched with a bag-type dust collector for use, so that the bag-type dust collector is easy to block under the condition of insufficient secondary combustion, and the treatment efficiency is reduced or the flue gas treatment equipment is ineffective.

The principle of the set of flue gas treatment equipment is that overflowed combustible gas is effectively collected and secondarily heated to the ignition temperature in the combustion chamber to be combusted, and as all waste gas during roasting needs to be reheated to raise the temperature, the energy consumption for secondary heating and temperature raising is very large, about the gas consumption is 5-7Nm 3/ton of products, and the secondary natural gas consumption of some enterprises reaches 10Nm 3/ton; the method for treating the flue gas is based on an optimization method on the production process of a three-partition wall roasting furnace, has limitations, namely the continuation of the combustion in the furnace, and the flue gas which is not completely combusted in the furnace is taken out of the furnace and is combusted again.

While 8-bin 9-flue furnaces have been in service for a long time, as the volatile matter combustion has been sufficient, the combustion consumption is still maintained at a low level, the average gas consumption of the whole year is 46Nm 3/ton of products, while the gas consumption of the traditional furnaces using external combustion treatment facilities is not lower than 53Nm 3/ton of products. The treatment capacity of the flue gas treatment facility of the roasting furnace is 26 ten thousand meters³The total investment of the flue gas amount is 1500 ten thousand yuan, and the flue gas is treated by adopting low-nitrogen combustion, an sNcr high-temperature denitration process, double desulfurization towers and an electric tar precipitator (electricity)The tar precipitator is made of Q235), the continuous operation of the facility is good (a small amount of tar can protect equipment from corrosion) because the tar amount in the burnt product is small, and the collected small amount of tar is used for the forming process and has no influence on the quality of the formed product; the flue gas after combustion enters a flue gas treatment facility through a main flue, no tar is stored in a pipeline passing through the flue gas all the year round, and the phenomenon that the fire accident is easily caused because a large amount of tar is stored in the flue gas of a three-partition wall roasting furnace is avoided; after the smoke is treated, the smoke is discharged through a chimney, the chimney does not have smoke or water vapor during production in summer, the water vapor is slightly generated during production in winter, and the pollutant index is superior to the corresponding emission standard.

In addition, it is further added that the gas consumption of the roasting furnaces of the same scale is compared:

if compared with the anode roasting kiln (16 material box 17 fire path) of the same scale, the natural gas consumption of the anode roasting furnace of the furnace combustion method can be reduced to 37Nm 3/ton product, and the comprehensive consumption of the roasting furnace gas for treating flue gas by the furnace combustion method is 53Nm³Per ton of product.

Finally, after the path of the flame in the flame path is prolonged, compared with the operation of the traditional roasting process, the temperature difference between the flame path temperature and the product temperature is increased by the kiln of the company, so that the temperature of the product can reach 560-. Because the temperature difference is increased, the overflow amount of volatile components is relatively reduced, the volatile components are overflowed in a step-by-step manner, the layers are clear, and the combustion is sufficient; in this state, the electric tar precipitator with three chambers and six electric fields is adopted for flue gas treatment operation, the electric fields of 1-2-4-5 have slight tar, and the electric fields of 3 and 6 are used until no tar exists; the facility operates stably, and the monitoring index is always kept in a stable and qualified state after the flue gas is treated;

the traditional roasting furnace flame path wall is designed into a furnace with three partition walls, the path of flame in the flame path is short, the temperature difference between the flame path and the product temperature is small by 180-260 ℃, the temperature of the flame path is about 430 ℃ at the initial stage of the overflow of volatile components (asphalt smoke), the temperature of the flame path cannot reach the ignition temperature, and the product in the furnace chamber 3 of the system is in the stage of simultaneously overflowing the volatile components (2p, 3p and 4p), so that 30-50 percent of the product cannot reach the ignition temperature and is combusted under the condition of insufficient oxygen participation, and as a result, the smoke is large, the tar is more and the combustion is insufficient, thereby causing great burden on the treatment facility with the electric tar precipitator;

according to practice, after the asphalt smoke is fully combusted, the tar is collected by an electric tar collector; the asphalt smoke which is not fully combusted is tar and a large amount of smoke dust after being trapped by the electric tar precipitator, and the smoke dust is easily adhered to the anode polar line of the electric tar precipitator, so that the efficiency of the electric tar precipitator is reduced or the electric tar precipitator fails after the electric tar precipitator is operated for a long time.

If the same material consumption is the same for treating the same smoke amount, the part of the treatment facility of the external combustion method which is more than the part of the treatment facility of the internal combustion method is the natural gas amount which needs to be added for secondary combustion. If the yield is 15 ten thousand tons per year, 7m is consumed per ton³The natural gas is consumed by 105 ten thousand meters each year³The annual additional cost of natural gas will reach 336 ten thousand yuan.

The working principle and the using process of the utility model are as follows: flue gas that will bake burning furnace output is carried to flue box 1 through advancing flue 5 in, through the setting of each partition wall of its inboard, can prolong the flue gas discharge route, and then can carry out corresponding processing to the flue gas, has solved current flue gas route and shorter and then lead to the incomplete condition of partial flue gas burning to take place.

While there have been shown and described what are at present considered the fundamental principles and essential features of the utility model and its advantages, it will be apparent to those skilled in the art that the utility model is not limited to the details of the foregoing exemplary embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims (5)

1. A novel flame path for an aluminum electrolysis prebaked anode roasting furnace is characterized in that: comprises a flame path box (1), the flame path box (1) is assembled on the outer side wall of a flame path wall (2) of a roasting furnace, the flame path box (1) is formed by assembling four plates of a left side wall (7), a bottom plate (14), a right side wall (8) and a main body plate (15), a cover plate positioned at the top of the four plates is further arranged in a burner hole (4), a smoke inlet groove positioned at the top end of the left side wall (7) is formed in the flame path box (1), a smoke exhaust groove which is opposite to the smoke exhaust groove position on the left side wall (7) and positioned at the top end of the right side wall (8) is further arranged on the outer wall of the flame path box (1), a first upper partition wall (9), a second upper partition wall (10) and a third upper partition wall (11) with the same specification are assembled on the inner side of the flame path box (1), the first upper partition wall (9), the second upper partition wall (10) and the third upper partition wall (11) have the same interval and are fixedly connected on the inner side of the main body plate (15) of the flame path box (1), the inboard of flame path case (1) is equipped with and is located left lower partition wall (12) and right lower partition wall (13) between first upper partition wall (9), second upper partition wall (10) and third upper partition wall (11), and the bottom fixed connection of partition wall (12) and right lower partition wall (13) is on the top surface of flame path case (1) inboard bottom plate (14) down in a left side.

2. The novel flame path for the aluminum electrolysis prebaked anode baking furnace of claim 1, wherein: fixed mounting has the flue (5) of advancing that is located left side wall (7) top and advances the flue groove outside on the outer wall of flame path case (1), still be equipped with discharge flue (6) that are located right side wall (8) top exhaust flue outside on the outer wall of flame path case (1), be equipped with the shrouding on discharge flue (6), and advance to be equipped with on flue (5) and be linked together with the tobacco pipe sleeve.

3. The novel flame path for the aluminum electrolysis prebaked anode baking furnace of claim 1, wherein: the outer wall of the flame path box (1) is fixedly provided with a pavement precast block (3) positioned at the top of the main body plate (15), six groups of burner ports (4) are assembled in the pavement precast block (3), and the bottom ends of the burner ports (4) are communicated with the inner cavity of the flame path box (1).

4. The novel flame path for the aluminum electrolysis prebaked anode roasting furnace according to claim 1, characterized in that: fixed mounting has the high alumina who is located partition wall (9) on the first and the second and goes up partition wall (10) outside to draw brick group on the inner wall of flame path case (1), and all be equipped with three high aluminas that the interval is the same in every high alumina of group draws brick group and draws the brick.

5. The novel flame path for the aluminum electrolysis prebaked anode baking furnace of claim 1, wherein: the inboard fixed mounting of flame path case (1) has the cigarette piece that leads that is located into flue (5) and discharge flue (6) outside, partition wall (10), third are gone up to partition wall (11), left side down partition wall (12) and right side down and all are equipped with between partition wall (13) and flame path case (1) inside wall and lead the cigarette piece on first upper partition wall (9), the second, and flame path case (1) inboard flue gas circulation direction is followed and is led the cigarette piece and advance.

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