CN215113889U - Submerged arc furnace for producing large-crystal fused magnesia - Google Patents
Submerged arc furnace for producing large-crystal fused magnesia Download PDFInfo
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- CN215113889U CN215113889U CN202120297586.8U CN202120297586U CN215113889U CN 215113889 U CN215113889 U CN 215113889U CN 202120297586 U CN202120297586 U CN 202120297586U CN 215113889 U CN215113889 U CN 215113889U
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Abstract
The utility model provides a hot stove in ore deposit of production macrocrystal electric smelting magnesite, including a stove section of thick bamboo device, feed arrangement and flue gas collection device are connected with the bell of a stove section of thick bamboo device, flue gas collection device utilizes the flue gas to preheat the material in the feed arrangement. The utility model recovers flue gas of the electric smelting furnace for the macrocrystal fused magnesia, and preheats raw materials by utilizing the waste heat of the flue gas; the natural magnesite powder can be pre-decomposed by high-temperature flue gas in the production process,releasing most of CO in advance2Gas, the adding proportion is improved; the utility model discloses can also realize automatic material conveying through flue gas temperature monitoring.
Description
Technical Field
The utility model relates to a macrocrystalline fused magnesia production and processing device, in particular to a submerged arc furnace for producing macrocrystalline fused magnesia.
Background
At present, most large-crystal electric melting magnesia takes high-quality light-burned magnesia powder as a main raw material, is added into a submerged arc furnace hearth with an open furnace top in a manual feeding mode, and is smelted by using three electrodes fixed by hanging or cross arms.
In the production process, with the continuous heating and melting of the raw materials, new light-burned magnesia powder needs to be continuously supplemented into the furnace barrel, and the work is generally subjectively judged by experienced workers and manually added. Because the top of the furnace barrel is of an open structure, hot flue gas can fly out of the furnace barrel with light-burned magnesia powder in the charging process, the flue gas can permeate a workshop, the field operation environment is extremely severe, and the physical health of workers is directly harmed.
Another disadvantage of manual charging is that workers need to continuously pay attention to the conditions in the furnace for a long time, and magnesium oxide powder is frequently added into the furnace barrel according to the smelting condition in the furnace, so that the labor intensity is high, fatigue operation is easy, and the danger coefficient is high. Meanwhile, the control of feeding time and feeding amount is directly influenced by human factors, which easily causes the fluctuation of furnace conditions in the smelting process and influences the quality of finished products and the ratio of large-crystal magnesia.
Meanwhile, the open furnace top structure also enables the waste heat of the flue gas to be dissipated to the environment, thereby not only increasing the environmental risk of field operation, but also wasting a large amount of heat energy.
In order to solve the problems, a small amount of large-crystal electric smelting magnesia ore heating furnace equipment adopts a new technology, and a furnace cover and an automatic feeding system are added. The top of the furnace barrel is subjected to certain sealing treatment, so that the smoke is limited in the furnace barrel, the diffusion of smoke and dust and the outward dissipation of heat are reduced, the field operation environment and the utilization rate of heat energy are improved, the power consumption is saved, the smelting efficiency is improved, and the smelting cost is reduced. And the light-burned magnesia powder raw material can be added into the furnace barrel in a timed and quantitative manner according to a preset program, so that the unstable factor of manual addition is avoided. The sintering efficiency is improved, so that the product quality is more stable.
According to the scheme, the raw materials entering the furnace are not preheated by utilizing the waste heat of the smoke gas in the smelting process, and meanwhile, even if a preset program automatic feeding process is adopted, only the timed and quantitative feeding is realized, and the proper feeding time and the feeding amount cannot be judged according to the real-time furnace condition.
SUMMERY OF THE UTILITY MODEL
The utility model provides a hot stove in ore deposit of production macrocrystal electric smelting magnesite clinker has solved macrocrystal electric smelting magnesite clinker and at the heating melting in-process, can utilize the problem that the smelting process flue gas waste heat preheats going into the stove raw materials, its technical scheme as follows:
the utility model provides a production macrocrystal electric smelting magnesite ore heating stove, includes a stove section of thick bamboo device, feed arrangement and flue gas collection device are connected with the bell of stove section of thick bamboo device, flue gas collection device utilizes the interior high temperature flue gas of ore heating stove to preheat the material among the feed arrangement.
The flue gas collection device comprises a flue gas collection pipeline, a cylinder head sealing cover, a drying cylinder and a cylinder tail sealing cover, wherein the flue gas collection pipeline is connected with the drying cylinder, and the cylinder head sealing cover and the cylinder tail sealing cover are respectively arranged at the two ends of the drying cylinder.
The feeding chute of the feeding device penetrates through the drying cylinder of the smoke collecting device, and the materials in the feeding chute are preheated through smoke in the drying cylinder.
The feeding device comprises a feeding elephant trunk and a discharging elephant trunk which are connected, the feeding elephant trunk penetrates into the drying cylinder from the cylinder tail sealing cover and then penetrates through the cylinder head sealing cover to be fixedly connected with the discharging elephant trunk, and the discharging elephant trunk is provided with a discharging valve.
The flue gas collecting device is provided with a thermocouple at the vertical section of the flue gas collecting pipeline, and the feeding device of the submerged arc furnace automatically controls the opening and the closing of the blanking valve according to the temperature signal of the thermocouple.
Furthermore, the drying cylinder is provided with a set angle in the horizontal direction, the tail part is higher than the head part, the tail part is connected with an outlet of the feeding slide pipe, the head part is connected with an inlet of the discharging slide pipe, so that the tail part feeds materials, the head part discharges materials, and the drying cylinder provides materials for the discharging slide pipe to convey materials when rotating.
The cylinder tail sealing cover is connected with the dust remover, and the flue gas is discharged after being purified.
The furnace cylinder device comprises a furnace body, a sealing washer and a furnace cover, wherein the furnace cover is arranged at the top of the furnace body, the ceramic fiber sealing washer is arranged between the lower part of the furnace cover and the top of the furnace body, the top of the furnace cover is a refractory material prefabricated part with an electrode insertion hole, and a gap between an electrode and the electrode insertion hole is sealed by using the combined electrode sealing washer.
And the inner wall of the flue gas collecting pipeline is provided with a heat-insulating refractory material.
And a refractory material layer is arranged on the inner wall of the furnace cover.
The submerged arc furnace for producing the macrocrystalline fused magnesia has the following advantages:
1. the furnace top is closed, so that the heat loss is reduced, smoke dust is prevented from flying out of the furnace, and the field operation environment is improved;
2. the ceramic fiber gasket and the electrode sealing ring further reduce the loss of smoke in the furnace;
3. flue gas in the furnace is uniformly recovered through a closed pipeline, and is introduced into a drying cylinder to preheat raw materials, so that the temperature of the raw materials entering the furnace is increased, and the smelting power consumption is reduced;
4. the high-temperature flue gas can decompose the natural magnesite powder and release most of CO in advance2The gas can improve the proportion of magnesite powder replacing light-burned magnesia powder and reduce the cost of raw materials;
5. the automatic control of charging into the furnace is realized by monitoring the temperature of the flue gas.
Drawings
FIG. 1 is a schematic view of the construction of the ore furnace for producing large-size crystallized fused magnesite;
the reference numbers in the figures: 1. a trolley; 2. a furnace body; 3. a sealing gasket; 4. a furnace cover; 5. a flue gas collection duct; 6. an electrode seal ring; 7. a furnace cover prefabricated part; 8. an electrode; 9. a barrel head sealing cover; 10. a drying cylinder; 11. a feeding chute; 12. a cylinder tail sealing cover; 13. and (5) discharging a chute.
Detailed Description
As shown in figure 1, the submerged arc furnace for producing the large-crystal fused magnesia comprises a furnace cylinder device, a feeding device and a flue gas collecting device, wherein the feeding device and the flue gas collecting device are connected with a furnace cover of the furnace cylinder device, a feeding elephant trunk of the feeding device penetrates through a drying cylinder of the flue gas collecting device, and materials of the feeding elephant trunk are preheated through flue gas in the drying cylinder.
The furnace cylinder device comprises a trolley 1, a furnace body 2, a sealing washer 3 and a furnace cover 4, wherein the furnace body 2 is placed on the trolley 1, the furnace cover 4 is arranged at the top of the furnace body 2, and the ceramic fiber sealing washer 3 is arranged between the lower part of the furnace cover 4 and the top of the furnace body 2 to enhance the sealing effect. The inner wall of the furnace cover 4 is provided with a refractory material layer which plays roles of heat insulation and external steel shell protection.
The top of the furnace cover 4 is a refractory material prefabricated part 7 with an electrode insertion hole, a gap between an electrode 8 and the electrode insertion hole is sealed by using a combined electrode sealing ring 6, the electrode sealing ring 6 is sleeved with two parts, and an inner hole formed by combination is equivalent to the diameter of the electrode 8 and can be placed close to the electrode 8.
And a flue gas hole is formed in the side wall of the furnace cover 4 and is used for connecting an inlet of a flue gas collecting pipeline 5. The side wall of the furnace cover 4 is also provided with a discharging hole, and the discharging hole is used for being connected with a discharging chute 13 and used for discharging. The height of the flue gas hole is slightly higher than that of the discharging hole, so that the fine powder is prevented from being brought out by the flue gas.
The flue gas collection device comprises a flue gas collection pipeline 5, a cylinder head sealing cover 9, a drying cylinder 10 and a cylinder tail sealing cover 12, the flue gas collection pipeline 5 is connected with the drying cylinder 10, and the two ends of the drying cylinder 10 are respectively provided with the cylinder head sealing cover 9 and the cylinder tail sealing cover 12. The cylinder tail sealing cover 12 is connected with a flue gas treatment device or a dust remover, and the flue gas is purified and then discharged.
The flue gas collecting pipe 5 connected with the furnace cover 4 extends upwards in an inclined way at first and then forms a vertical pipe, so that fine powder brought out by the flue gas can slide back into the furnace. The flue gas is finally introduced into the head of the drying cylinder 10 through the flue gas collecting pipeline 5, and the inner wall of the flue gas collecting pipeline 5 is provided with a heat-insulating refractory material, so that heat loss of the flue gas in the pipeline is reduced.
The vertical section of the flue gas collecting pipeline 5 is provided with a thermocouple for monitoring the temperature of flue gas, and the feeding device realizes automatic control of feeding into the furnace according to temperature signals. The flue gas temperature can gradually rise along with the powder melting progress in the furnace body, and when the flue gas temperature reaches the set upper limit temperature, the valve of the discharging chute 13 controlled by the feeding device is automatically opened along with the flue gas temperature, so that raw materials are added into the furnace body. The flue gas temperature can reduce gradually in the feeding process, and when the flue gas temperature reaches the set lower limit temperature, the valve of the discharging chute 13 of the feeding device is controlled to be closed by the feeding device, so that the feeding operation is automatically stopped.
The upper layer of the furnace barrel has a dry powder layer with a certain thickness in the smelting process, and the arc-shielding and heat-insulating effects are achieved. In the smelting process, the dry powder layer can be continuously melted and thinned, even completely melted, so that the materials need to be fed in time to ensure the proper thickness of the dry powder layer. The process that dry powder material layer attenuation disappears even must lead to the rising of gas temperature, the utility model discloses a realize unloading automatic control to the monitoring of gas temperature signal. When the smoke temperature reaches the set upper limit value, the blanking action is triggered, the feeder starts blanking at a constant speed, the smoke temperature is reduced along with the gradual thickening of a dry powder layer in the furnace in the blanking process, and the blanking is stopped when the smoke temperature reaches the set lower limit value, so that the unsmooth exhaust in the furnace caused by the over-thick dry powder layer is avoided.
The feeding device comprises a feeding chute 11 and a discharging chute 13 which are connected, wherein the feeding chute 11 penetrates through two ends of a drying cylinder 10 and also penetrates through a cylinder head sealing cover 9 and a cylinder tail sealing cover 12, the feeding chute 11 penetrates through the cylinder tail sealing cover 12 and penetrates out of the cylinder head sealing cover 9 and then is fixedly connected with the discharging chute 13, and the discharging chute 13 is provided with a valve for controlling the entering and stopping of materials.
The high-temperature flue gas can predefine the raw materials, and the production of large-crystal fused magnesia mainly uses light-burned magnesia powder as a main raw material, and less uses natural magnesite. Because the main component of the natural magnesite is MgCO3Decomposition reaction occurs at 350 ℃, MgCO3Complete decomposition will release about 52.3% of CO2And a large amount of gas is released in a centralized manner, so that splashing and material collapse in the furnace are easily caused, and finally, the furnace shell is burnt through. Based on this, the existing large-crystal electric melting magnesite production mostly uses light-burned magnesia powder as a main raw material, and uses little or even no natural magnesite powder. Magnesite powder can be pre-decomposed by utilizing the waste heat of high-temperature flue gas, almost all CO is heated and decomposed before entering a furnace barrel2The gas is released in advance, and violent reaction can not be generated in the furnace. The addition of magnesite powder greatly reduces the cost of raw materials.
In another embodiment, the drying cylinder 10 is angled horizontally, with the tail slightly higher than the head, which is connected to the outlet of the inlet chute 11, and the tail is fed and the head is discharged, which is connected to the inlet of the outlet chute 13.
The barrel body of the drying barrel 10 can rotate under the driving of a motor, raw materials entering the barrel from the tail part of the drying barrel 10 are fully mixed with hot smoke entering the barrel head part in the barrel, the raw materials are heated and pre-decomposed, finally flow out from the barrel head part, and enter the furnace body through a discharge chute 13.
The head and the tail of the drying cylinder 10 are provided with sealing covers, and low-temperature flue gas in the cylinder is finally introduced into a dust remover through an outlet of a kiln tail cover.
The utility model recovers flue gas of the electric smelting furnace for the macrocrystal fused magnesia, and preheats raw materials by utilizing the waste heat of the flue gas; in the production process, the natural magnesite powder can be pre-decomposed by high-temperature flue gas, and most CO is released in advance2Gas, the adding proportion is improved; the utility model discloses can also realize automatic material conveying through flue gas temperature monitoring.
Claims (10)
1. The submerged arc furnace for producing large-crystal fused magnesia is characterized in that: the device comprises a furnace barrel device, a feeding device and a flue gas collecting device, wherein the feeding device and the flue gas collecting device are connected with a furnace cover of the furnace barrel device, and the flue gas collecting device preheats materials in the feeding device by utilizing flue gas.
2. The submerged arc furnace for producing macrocrystalline fused magnesia according to claim 1, wherein: the flue gas collection device comprises a flue gas collection pipeline, a cylinder head sealing cover, a drying cylinder and a cylinder tail sealing cover, wherein the flue gas collection pipeline is connected with the drying cylinder, and the cylinder head sealing cover and the cylinder tail sealing cover are respectively arranged at the two ends of the drying cylinder.
3. The submerged arc furnace for producing large crystal fused magnesia according to claim 2, wherein: the feeding chute of the feeding device penetrates through the drying cylinder of the smoke collecting device, and the materials in the feeding chute are preheated through smoke in the drying cylinder.
4. The submerged arc furnace for producing macrocrystalline fused magnesia according to claim 3, wherein: the feeding device comprises a feeding elephant trunk and a discharging elephant trunk which are connected, the feeding elephant trunk penetrates into the drying cylinder from the cylinder tail sealing cover and then penetrates through the cylinder head sealing cover to be fixedly connected with the discharging elephant trunk, and the discharging elephant trunk is provided with a discharging valve.
5. The submerged arc furnace for producing macrocrystalline fused magnesia according to claim 4, wherein: the feeding device of the submerged arc furnace automatically controls the opening and the closing of the blanking valve according to the temperature signal of the thermocouple.
6. The submerged arc furnace for producing large crystal fused magnesia according to claim 2, wherein: the drying cylinder is provided with a set angle in the horizontal direction, the tail part is higher than the head part, the tail part is connected with an outlet of the feeding slide pipe, the head part is connected with an inlet of the discharging slide pipe, so that the tail part feeds materials, the head part discharges materials, and the drying cylinder provides materials for the discharging slide pipe to convey materials when rotating.
7. The submerged arc furnace for producing large crystal fused magnesia according to claim 2, wherein: the cylinder tail sealing cover is connected with the dust remover, and the flue gas is discharged after being purified.
8. The submerged arc furnace for producing macrocrystalline fused magnesia according to claim 1, wherein: the furnace cylinder device comprises a furnace body, a sealing washer and a furnace cover, wherein the furnace cover is arranged at the top of the furnace body, the ceramic fiber sealing washer is arranged between the lower part of the furnace cover and the top of the furnace body, the top of the furnace cover is a refractory material prefabricated part with an electrode insertion hole, and a gap between an electrode and the electrode insertion hole is sealed by using the combined electrode sealing washer.
9. The submerged arc furnace for producing large crystal fused magnesia according to claim 2, wherein: and the inner wall of the flue gas collecting pipeline is provided with a heat-insulating refractory material.
10. The submerged arc furnace for producing macrocrystalline fused magnesia according to claim 8, wherein: and a refractory material layer is arranged on the inner wall of the furnace cover.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120297586.8U CN215113889U (en) | 2021-02-02 | 2021-02-02 | Submerged arc furnace for producing large-crystal fused magnesia |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120297586.8U CN215113889U (en) | 2021-02-02 | 2021-02-02 | Submerged arc furnace for producing large-crystal fused magnesia |
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| Publication Number | Publication Date |
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| CN215113889U true CN215113889U (en) | 2021-12-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120297586.8U Active CN215113889U (en) | 2021-02-02 | 2021-02-02 | Submerged arc furnace for producing large-crystal fused magnesia |
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| CN (1) | CN215113889U (en) |
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2021
- 2021-02-02 CN CN202120297586.8U patent/CN215113889U/en active Active
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