CN216141595U - Side type powder feeding top-blown furnace system - Google Patents
Side type powder feeding top-blown furnace system Download PDFInfo
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- CN216141595U CN216141595U CN202121622232.2U CN202121622232U CN216141595U CN 216141595 U CN216141595 U CN 216141595U CN 202121622232 U CN202121622232 U CN 202121622232U CN 216141595 U CN216141595 U CN 216141595U
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Abstract
A side entry powder top blower system comprising: the device comprises a cylindrical furnace body, a powdery material charging nozzle, a furnace top sample rod, a top-blown furnace spray gun, a belt conveying feed inlet, a split flow conveying pipe, a quantitative pneumatic conveying device, a powdery material collecting bin feed inlet and a furnace top cover; the powdery material charging nozzles are symmetrically arranged around the furnace wall of the cylindrical furnace body and are positioned on the same horizontal plane, the powdery material charging nozzles form an angle of 45 degrees with the furnace wall, and the centers of the nozzles are opposite to the center line of the furnace bottom. The utility model can solve the problems of large transportation flying loss, large material returning amount, poor operation environment, harm to the health of operators and the like in the smelting process of tin for smelting powdery tin materials.
Description
Technical Field
The utility model relates to the technical field of crude tin smelting by a pyrogenic process, in particular to a side type powder feeding top-blown furnace system.
Background
Large-scale tin smelters generally select a top-blown furnace with high hearth capacity as tin smelting equipment, and the treated tin-containing materials mainly comprise tin concentrate, tin calcine subjected to roasting and arsenic and sulfur removal, powdery tin smoke dust obtained after fuming and volatilizing low-tin materials in a fuming furnace, powdery tin smoke dust collected in a tail gas system in the smelting process of the top-blown furnace and the like. The calcine and the smoke dust materials have fine granularity and low moisture, and are easy to fly and lose in the transferring and feeding processes. The materials with small particle size and low water content can be collectively called as powdery tin materials, the percentage of the materials in a tin smelting system, which accounts for the total tin materials input in smelting, is about 40-60%, and the ratio of the materials is large, the optimization of the treatment method has very important significance for reducing cost and improving efficiency and improving operation environment of a tin smelting plant, and the method is worthy of deep research.
In the production process of the current large-scale tin smelting plant, all tin-containing materials are conveyed by a belt and are put into a top-blown smelting furnace from the top of the furnace for reduction smelting to produce crude tin, the tin-containing materials with lower moisture and smaller granularity need to be granulated by adding water, and the moisture content of mixed materials entering the furnace generally needs to reach about 10 percent. A large amount of water is mixed into the materials entering the furnace, so that the capacity of a smelting hearth is reduced, the smelting energy consumption is increased, and the treatment difficulty and the treatment cost are increased after the flue gas produced in the smelting process is accompanied by a large amount of high-temperature steam and enters a subsequent flue gas treatment system. Because the types and components of tin-containing materials treated by a smelting plant are complex, pretreatment before smelting is generally required to be carried out, and various tin-containing powdery materials are produced, such as tin-containing powdery materials produced by roasting in a fluidized bed furnace, tin-containing smoke dust produced in a fuming furnace, tin-containing smoke dust produced in other smelting furnaces and other tin-containing powdery materials; the various tin-containing powdery materials need to be transported into a batching ore bin through pneumatic conveying or an automobile, and then are batched in front of the furnace and conveyed into a top-blown furnace through a belt for smelting. Therefore, the losses such as splashing, leakage and flying are inevitable in the process of transporting various tin-containing powdery materials to the smelting furnace through the furnace top belt, the tin-containing powdery materials have long falling stroke in the smelting furnace and easily enter a tail gas dust collection system along with the flue gas of a hearth and then enter a material mixing process, the material returning amount in the smelting process is increased, the material loss in the material returning process is increased, the direct tin smelting yield and the recovery rate are reduced, the smelting cost is improved, and meanwhile, the field operation environment is polluted by dust.
In order to solve the problems of metal loss and poor operation environment caused by increasing smelting energy consumption, increasing the burden of a tail gas treatment system, flying smoke caused by transportation, reducing the comprehensive recovery rate of tin smelting and the like in the smelting production process of various tin-containing powdery materials, the tin smelting field urgently needs to develop a classified disposal method for the tin-containing powdery materials so as to achieve the effects of clean tin smelting production environment, high direct recovery rate of tin smelting, environmental protection and energy conservation.
Therefore, it is an urgent need to solve the problem of providing a clean, environment-friendly and efficient method for treating powdered tin material.
SUMMERY OF THE UTILITY MODEL
In view of the above, the utility model provides a side type powder feeding top-blowing furnace system, which can solve the problems of large transportation flying loss, large material returning amount, poor operation environment, harm to the health of operators and the like in the process of smelting tin powder materials.
In order to achieve the purpose, the technical scheme adopted by the utility model is as follows:
a side entry powder top blower system comprising: the device comprises a cylindrical furnace body, a powdery material charging nozzle, a furnace top sample rod, a top-blown furnace spray gun, a belt conveying feed inlet, a split flow conveying pipe, a quantitative pneumatic conveying device, a powdery material collecting bin feed inlet and a furnace top cover;
the powdery material charging nozzles are symmetrically arranged around the furnace wall of the cylindrical furnace body and are positioned on the same horizontal plane, the powdery material charging nozzles form an angle with the furnace wall, and the centers of the nozzles are opposite to the center line of the furnace bottom; the top of the cylindrical furnace body is provided with a furnace top cover, and the top-blown furnace spray gun penetrates through the center of the furnace top cover and extends into the bottom of the cylindrical furnace body; the furnace top sample rod penetrates through the furnace top cover and extends into the bottom of the cylindrical furnace body; the belt conveying feed inlet is formed in the furnace top cover;
the powdery material collection bin is characterized in that a powdery material collection bin feeding port is formed in the top of the powdery material collection bin, the bottom of the powdery material collection bin is communicated with a quantitative pneumatic conveying device, and the quantitative pneumatic conveying device is communicated with a powdery material furnace feeding nozzle through a shunting conveying pipe.
Preferably, the vertical positions of the symmetrically opposite corresponding nozzles of the powdery material furnace-entering nozzle are arranged on the horizontal plane of the slag line which enables the jet intersection point to be at the maximum processing capacity of the top-blown furnace.
Preferably, the number of the powder material charging nozzles can be selected to be other even numbers.
Preferably, the feed inlets of the powdery material collecting bin receive powdery tin materials and pulverized coal in different working sections in the tin smelting process, and the feed inlets of the powdery material collecting bins respectively correspond to powdery materials from different sources.
Preferably, the powdery material collection bin is further provided with a DCS control system, and the powdery material is conveyed into the powdery material collection bin in a quantitative pneumatic conveying mode through setting unit time and conveying speed to complete material mixing.
Preferably, the conveying speed of the quantitative pneumatic conveying device is 10-35t/h, and the conveying pressure is 0.6-0.9 MPa.
Through the technical scheme, compared with the prior art, the utility model has the following beneficial effects:
the utility model provides a side-type powder feeding top-blown furnace and a treatment method thereof, wherein powdery tin calcine produced by desulfurization of a fluidized roaster, powdery tin smoke produced by fuming and enriching tin middlings and tin slag in a fuming furnace, the powdery tin smoke collected by a waste heat boiler and an electric dust collector of a smoke treatment system in the smelting process of the top-blown furnace, tin-containing powdery materials from different sources in a plurality of tin smelting plants, are directly and uniformly fed into a molten pool for smelting from the side wall of a cylindrical furnace body in a pneumatic conveying mode, and do not naturally fall into the molten pool through a belt conveying feed inlet arranged on a furnace top cover. The different powdery tin materials are collected in proportion and are simultaneously conveyed in a quantitative pneumatic conveying mode, so that the material mixing process can be completed in the powdery material collecting bin through airflow disturbance, and the powdery tin materials can be rapidly smelted.
The utility model provides a side-type powder feeding top-blown converter, which realizes the airtight connection between the storage bins in the whole conveying process, simplifies the conveying process of powder, avoids the flying loss in the powder conveying process and greatly improves the operating environment of workers. The powder of different sources at the top of the powder material collecting bin is provided with the independent powder material collecting bin feed inlets, so that the uniform material mixing process can be completed by utilizing airflow disturbance in the powder material collecting bin according to different powder materials in proportion by adjusting the conveying flow of different powder materials according to production requirements under the state of simultaneous conveying, and the accurate control and production management of powder melting are facilitated.
During the conveying process, powder is uniformly distributed to four powder material charging nozzles of the furnace body through a distribution pipeline, so that material flows are dispersed into the furnace from different directions, and accretions caused by raw material accumulation are not easy to occur in the powder feeding process; the nozzles are symmetrically arranged, so that impact abrasion of the material-carrying airflow to the furnace wall is reduced, and a positive effect on protecting the furnace lining is achieved; the nozzle is obliquely arranged downwards, and the jet flow intersection point is positioned at the position of the slag liquid level with the maximum treatment capacity of a single furnace, so that the nozzle is far away from a high-temperature smelting area to a certain extent, the service life of the nozzle is prolonged, and the material-carrying airflow plays a role in stirring the molten pool with the same-direction acting force of a furnace body spray gun.
The utility model changes the feeding mode of the powdery tin-containing material in the process of smelting tin in the top-blowing furnace. The mode of feeding after water is added into a cylindrical mixer by a belt conveying feed inlet after the original granulation is changed into the mode of directly spraying powdery tin-containing materials into a molten pool at high speed by pneumatic conveying. The phenomenon that the direct yield of tin smelting is low due to the fact that a large amount of powdery materials enter a dust collecting system when the materials are fed from the top of the furnace is avoided to the greatest extent, the input amount of water is reduced, the smoke dust pelletizing process is omitted, the feeding flow of the powdery tin materials is simplified, the processing difficulty of follow-up smoke of a top-blown furnace system is reduced, and the positive effect of improving the processing capacity of the top-blown furnace is achieved. In addition, the pulverized coal is mixed into the powder injected into the furnace in the powder material collecting bin in proportion as fuel, so that the powder material is gradually melted by burning the pulverized coal in the injection process, and the smelting efficiency of the top-blown furnace is further improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a side-type powder-feeding top-blown furnace system according to the present invention;
in the figure: 1-cylindrical furnace body, 2-powdery material charging nozzle, 3-furnace top sample rod, 4-top-blown furnace spray gun, 5-belt conveying feed inlet, 6-shunt conveying pipe, 7-quantitative pneumatic conveying device, 8-powdery material gathering bin, 9-powdery material gathering bin feed inlet and 10-furnace top cover.
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 derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Examples
The embodiment of the utility model provides a side type powder feeding top-blown furnace system, which adopts the following technical scheme:
the side type powder feeding top-blown furnace system is shown in figure 1 and comprises: the device comprises a cylindrical furnace body 1, a powdery material furnace inlet nozzle 2, a furnace top sample rod 3, a top-blown furnace spray gun 4, a belt conveying feed inlet 5, a shunt conveying pipe 6, a quantitative pneumatic conveying device 7, a powdery material gathering bin 8, a powdery material gathering bin feed inlet 9 and a furnace top cover 10;
the powdery material charging nozzles 2 are symmetrically arranged around the furnace wall of the cylindrical furnace body 1 and are positioned on the same horizontal plane, the powdery material charging nozzles 2 form an angle of 45 degrees with the furnace wall, and the centers of the nozzles are opposite to the center line of the furnace bottom;
a furnace top cover 10 is arranged at the top of the cylindrical furnace body 1, and the top-blown furnace spray gun 4 penetrates through the center of the furnace top cover 10 and extends into the bottom of the cylindrical furnace body 1; the furnace top sample rod 3 penetrates through the furnace top cover 10 and extends into the bottom of the cylindrical furnace body 1; the belt conveying feed port 5 is formed in the furnace top cover 10;
the top of the powdery material gathering bin 8 is provided with a powdery material gathering bin feed inlet 9, the bottom of the powdery material gathering bin 8 is communicated with a quantitative pneumatic conveying device 7, and the quantitative pneumatic conveying device 7 is communicated with the powdery material furnace-entering nozzle 2 through a shunt conveying pipe 6.
The vertical positions of 2 corresponding nozzles symmetrically opposite to the powdery material furnace-entering nozzle 2 are arranged on the horizontal plane of the slag line which enables the jet intersection point to be at the maximum processing capacity of the top-blown furnace.
The powder material collecting bin feed inlets 9 receive powder tin materials and powder coal in different working sections in the tin smelting process, and the powder material collecting bin feed inlets 9 correspond to powder materials from different sources respectively.
The powdery material gathering bin 8 is also provided with a DCS control system, and the powdery material is conveyed into the powdery material gathering bin 8 in a quantitative pneumatic conveying mode to complete material mixing by setting unit time and conveying speed.
The conveying speed of the quantitative pneumatic conveying device 7 is 10-35t/h, and the conveying pressure is 0.6-0.9 MPa.
The work flow of the side type powder material entering top-blown furnace system is as follows:
the powdered tin calcine produced by desulfurizing in the fluidized roaster in the tin smelting system has the components of Sn 35 wt.%, S1.1 wt.%, As 0.8 wt.%, H2O is less than or equal to 3 wt.%, and powdery tin smoke dust Sn 45 wt.%, Pb 0.2 wt.%, S0.9 wt.%, As 1.5 wt.%, Fe 2 wt.%, H1 produced by fuming and enriching tin middlings and tin slags in a fuming furnace2O is less than or equal to 4.5 wt.%, and the powdered tin smoke dust Sn 38 wt.%, Pb 1.0 wt.%, S0.75 wt.%, As 1.8 wt.%, Fe 3 wt.%, H3 wt.% collected by a waste heat boiler and an electric dust collector of a flue gas treatment system in the smelting process of a top-blown furnace2O is less than or equal to 4.5 wt.%, and powdery tin materials and pulverized coal from different sources in several tin smelting plants are simultaneously conveyed into the powdery material collecting bin 8 through corresponding quantitative pneumatic conveying devices to finish mixing, wherein the powdery tin calcine accounts for 40%, the powdery fuming furnace smoke accounts for 30%, the powdery top-blown furnace smoke accounts for 20%, and the pulverized coal accounts for 10%.
In the feeding stage of the top-blowing furnace with the specification of phi 5m, a belt is used for conveying materials to be fed into a bottom material by a feeding port 5, then a spray gun 4 of the bottom-blowing furnace is used for melting the bottom material to manufacture a molten pool, and when the depth of the molten pool reaches 500mm, the normal feeding stage is started. The conveying pressure of the quantitative pneumatic conveying device 7 is adjusted to be 0.7MPa, the unit conveying capacity is 30t/h, and material flow is divided by the dividing conveying pipe 6 and then is respectively injected into a molten pool for smelting through the four powder material charging nozzles 2. Other materials containing more than or equal to 35 wt.% of tin, reducing coal and solvent are mixed, the feeding speed is controlled by a DCS control system, the materials are conveyed by a belt through a feeding hole 5 and are put into the furnace, and in the whole feeding process, the top-blown furnace spray gun 4 is positioned at the smelting gun position to continuously provide heat for the furnace.
And when the accumulated feeding amount of all the tin-containing materials reaches 90t, ending the single feeding process, stopping pneumatic conveying to feed the powdery tin materials and feeding other tin materials through the belt conveying feeding port 5, and enabling the top-blown converter to enter a smelting stage. But the nozzle is still in the injection state without loading materials, and the injection air quantity is adjusted to the minimum value. In the smelting process, continuously feeding reducing coal by controlling the feeding rate of the belt conveying feeding port 5 to maintain the reducing atmosphere in the furnace, discharging the furnace top sample rod 3 at certain intervals, and judging the time of entering a strong reduction stage by observing the condition that a slag sample carried by the furnace top sample rod 3 carries raw materials. After entering a strong reduction stage, increasing the input amount of reduction coal, reducing for a certain time, taking a slag sample from a lower furnace top sample rod 3, rapidly analyzing the tin content in slag, entering a tin and slag discharging stage when the Sn content of the taken slag sample is less than 5%, completing a single-furnace smelting process, and then entering the next furnace period.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (5)
1. A side-type powder-feeding top-blown furnace system is characterized by comprising: the device comprises a cylindrical furnace body (1), a powdery material charging nozzle (2), a furnace top sample rod (3), a top-blown furnace spray gun (4), a belt conveying feed inlet (5), a split-flow conveying pipe (6), a quantitative pneumatic conveying device (7), a powdery material collecting bin (8), a powdery material collecting bin feed inlet (9) and a furnace top cover (10);
the powdery material charging nozzles (2) are symmetrically arranged around the furnace wall of the cylindrical furnace body (1) and are positioned on the same horizontal plane, the powdery material charging nozzles (2) form an angle of 45 degrees with the furnace wall, and the centers of the nozzles are opposite to the center line of the furnace bottom;
a furnace top cover (10) is arranged at the top of the cylindrical furnace body (1), and the top-blown furnace spray gun (4) penetrates through the center of the furnace top cover (10) and extends into the bottom of the cylindrical furnace body (1); the furnace top sample rod (3) penetrates through the furnace top cover (10) and extends into the bottom of the cylindrical furnace body (1); the belt conveying feed inlet (5) is formed in the furnace top cover (10);
the powder material gathering device is characterized in that a powder material gathering bin feeding port (9) is formed in the top of the powder material gathering bin (8), the bottom of the powder material gathering bin (8) is communicated with a quantitative pneumatic conveying device (7), and the quantitative pneumatic conveying device (7) is communicated with a powder material furnace feeding nozzle (2) through a shunting conveying pipe (6).
2. The side-type powder feeding top-blown furnace system according to claim 1, wherein the vertical positions of 2 corresponding nozzles symmetrically opposite to the powdery material feeding nozzle (2) are set at the slag line level where the intersection point of the jet flows is at the maximum processing capacity of the top-blown furnace.
3. The side-type powder feeding top-blown furnace system according to claim 1, wherein the powder material collecting bin feed inlets (9) receive powder tin materials and powder coals in different sections of a tin smelting process, and the powder material collecting bin feed inlets (9) correspond to powder materials from different sources respectively.
4. The side type powder feeding top-blown furnace system according to claim 1, wherein the powder material collecting bin (8) is further provided with a DCS control system, and the powder material is fed into the powder material collecting bin (8) in a quantitative pneumatic conveying mode through setting unit time and conveying speed to complete material mixing.
5. The side type powder feeding top-blown furnace system according to claim 1, wherein the conveying speed of the quantitative pneumatic conveying device (7) is 10-35t/h, and the conveying pressure is 0.6-0.9 MPa.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113549774A (en) * | 2021-07-16 | 2021-10-26 | 云南锡业股份有限公司锡业分公司 | Side type powder feeding top-blown furnace and treatment method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113549774A (en) * | 2021-07-16 | 2021-10-26 | 云南锡业股份有限公司锡业分公司 | Side type powder feeding top-blown furnace and treatment method thereof |
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