CN216558257U - Powder flight melting furnace - Google Patents

Abstract

The utility model discloses a powder flying melting furnace which can be widely applied to the chemical fields of glass production, iron making, non-ferrous metal smelting, solid fuel gasification and the like. The utility model can better solve the problems by arranging a scavenging gas input port on the raw material feeding pipeline or arranging a forced feeding device on the feeding port.

Description

Powder flight melting furnace

Technical Field

The utility model belongs to the field of chemical industry, and particularly relates to a melting furnace for melting powdery raw materials (or ash contained in powdery solid fuel) at high temperature in a flying state, which can be widely used for producing glass, ironmaking, non-ferrous metal smelting, solid fuel gasification and the like.

Background

In the fields of glass production, iron making, non-ferrous metal smelting, solid fuel gasification and the like, the reaction is required to be carried out in a high-temperature kiln, the powdery raw material (or the powdery solid fuel) is dispersed in high-temperature gas for high-temperature reaction, the heat and mass transfer speed is high, and the energy consumption and the production cost can be reduced. The utility model of U.S. Pat. No. US8747524B2 discloses a melting furnace, which can be used for high-temperature reaction of powdery raw materials such as powdery glass raw materials, iron-making raw materials, non-ferrous metal production raw materials, solid fuels and the like in a flying state. When the feeding is not smooth, the feeding amount of raw materials can be reduced, the yield is reduced, and the stability of the working condition of the melting furnace is influenced; when the blockage is serious, the material can not be fed, and the furnace can only be stopped for maintenance, thereby causing great economic loss.

SUMMERY OF THE UTILITY MODEL

In order to solve the above problems, the inventors have found through careful study that: in the hearth of the melting furnace, fuel (when the fuel is used for gasifying solid fuel, the fuel is powdery solid fuel which is input into the hearth from a feed inlet, and the content in brackets in the following paragraph is indicated as the case of gasifying solid fuel) is rapidly mixed and combusted with oxygen-containing gas, the melting temperature of powdery raw material (or ash content in the powdery solid fuel) is above the melting temperature, the temperature is above 1500 ℃ when the fuel is generally used for producing glass, ironmaking and gasifying solid fuel, the temperature is above 1350 ℃ when the fuel is used for flash copper smelting of copper concentrate, the powdery raw material (or the powdery solid fuel) is dispersed in high-temperature gas and is in a flying state, the heat and mass transfer efficiency is very high, the powdery raw material (or the ash content in the powdery solid fuel) is rapidly melted into liquid molten dust, the liquid molten dust is scoured and adhered to the furnace wall along with the flow of the high-temperature gas in the hearth, under the action of gravity, the liquid molten dust flows downwards to a liquid outlet near the bottom of the hearth to be output. At the feed inlet, as the temperature in the hearth reaches above the melting temperature of the powdery raw material (or the ash content of the powdery solid fuel), the powdery raw material fed into the hearth from the feed inlet can be adhered to the inner wall of the feed inlet, the powdery raw material (or the ash content of the powdery solid fuel) is heated, melted and adhered to the inner wall of the feed inlet, and more adhesive substances are accumulated continuously to cause the blockage of the feed inlet.

In order to solve the above problems, the inventor has repeatedly studied and experimented to obtain a new technical scheme:

a powder flying melting furnace comprises a raw material input device, a raw material feeding pipeline, a feeding hole, an air inlet, a hearth, a furnace wall, an air outlet, an oxygen-containing gas input device and an exhaust device; the gas inlet is communicated with an oxygen-containing gas input device, and the gas outlet is communicated with an exhaust device; the raw material feeding pipeline comprises an outlet end and an inlet end, the outlet end is communicated with the feeding hole, and the inlet end is communicated with the raw material input equipment; and a purge gas inlet is arranged on the raw material feeding pipeline.

Compared with the prior art, the blowing gas plays the effect of sweeping to the feed inlet inner wall, avoids likepowder raw materials adhesion on the feed inlet inner wall, and the blowing gas has the cold exact effect to the feed inlet inner wall, can reduce the temperature of feed inlet inner wall to being less than raw materials (or likepowder solid fuel contains the ash) melting temperature, can not form the melt and bond, can avoid blockking up.

As an improvement of the flying melting furnace for powder, a purge gas input port arranged on the raw material feeding pipeline is connected with a purge gas input pipeline; and a valve is arranged on the purge gas input pipeline.

The valve of purge gas input pipeline facial make-up can be used for adjusting the purge gas quantity, makes the purge gas quantity reach more appropriate quantity, avoids the quantity to blow clean feed inlet inner wall when crossing excessively, also can avoid the quantity to cross excessively to feed inlet inner wall cooling range inadequately and appear the condition that feed inlet inner wall temperature risees to raw materials (or the ash content that solid fuel contains) melting temperature more than to cross. In order to increase the furnace temperature, it is usually necessary to preheat the oxygen-containing gas before it is fed to the furnace. The purge gas is not preheated, and if the used amount is too large, the temperature of the hearth can be reduced. The valve installed on the scavenging gas input pipeline can be used for adjusting the dosage of scavenging gas and avoiding the condition that the temperature of the hearth is reduced too much when the dosage is too high.

The purge gas may be nitrogen or air. The air is used as the purge gas, so that the air is easy to obtain, and only a blower needs to be connected to the purge gas input port, and the compressed air can be input. If the furnace pressure in the hearth is controlled to be in a negative pressure state, the raw material feeding pipeline is provided with the opening, and outside air can be sucked as blowing air, so that the furnace is very convenient.

Use the sweep gas can avoid blockking up, but can reduce furnace temperature, in order not to reduce furnace temperature promptly, can avoid the feed inlet to block up again, the inventor has obtained the new scheme of second through repeated research and experiment:

a powder flying melting furnace comprises a raw material input device, a raw material feeding pipeline, a feeding hole, an air inlet, a hearth, a furnace wall, an air outlet, an oxygen-containing gas input device and an exhaust device; the gas inlet is communicated with an oxygen-containing gas input device, and the gas outlet is communicated with an exhaust device; the raw material feeding pipeline comprises an outlet end and an inlet end, the outlet end is communicated with the feeding hole, and the inlet end is communicated with the raw material input equipment; and the feed inlet is provided with a forced feeding device, and the forced feeding device is a device for pushing the powdery raw material into the feed inlet from the raw material feed pipeline through mechanical thrust.

The forced feeding equipment comprises a push rod, a rod containing cavity, a piston and a driving mechanism for pushing the piston to reciprocate; the rod accommodating cavity is connected with the inlet end of the raw material feeding pipeline, and the outer diameter of the push rod is matched with the inner diameter of the raw material feeding pipeline; one end of the piston is connected with the tail end of the push rod, and the other end of the piston is connected with the driving mechanism; the top end of the push rod retreats into the rod accommodating cavity when reaching the retraction end position of the reciprocating motion and reaches the feed inlet when reaching the propulsion end position of the reciprocating motion; the tail end of the push rod is positioned in the rod containing cavity when reaching the pushing terminal position of the reciprocating motion.

Compared with the prior art, the push rod reciprocates to push powdery raw materials in the raw material feeding pipeline to enter the hearth through the feeding hole, and molten materials on the inner wall of the feeding hole can be continuously forced to be pushed into the hearth by the push rod, so that accumulation and blockage cannot be formed.

The present invention may also employ another positive feed device comprising a spring-like helical blade and a shaft which is mechanically driven to rotate; the helical blade is positioned in the raw material feeding pipeline, the shaft is positioned on the central line of the helical blade, and the shaft is fixedly connected with the helical blade.

Compared with the prior art, because the helical blade is driven by the shaft to rotate in the raw material feeding pipeline, powdery raw materials in the raw material feeding pipeline can be pushed to enter the hearth through the feeding hole, and melts on the inner wall of the feeding hole can be continuously forced to advance the hearth by the thrust of the helical blade, so that accumulation and blockage cannot be formed.

Although the problem of blockage can be solved by adopting the forced feeding equipment, the blowing gas which is not preheated does not need to be input, so that the temperature of a hearth is prevented from being reduced. However, the inventors have found that the use of the purge gas can sufficiently disperse the powdery raw material in the high-temperature gas flow in the furnace, and the high-temperature reaction can be more sufficient. In the above-mentioned chemical industry fields such as production glass, ironmaking, copper smelting or solid fuel gasification, through experimental comparison discovery, use the scheme of purge gas, with prior art (do not to the scheme of inputing purge gas in the raw materials charge-in pipeline), the above-mentioned scheme of adopting the compulsory feeding equipment of push rod or helical blade compares respectively, can obtain following better technological effect:

when the glass is produced, the product percent of pass is improved by 3.6 percent compared with the prior art, the product percent of pass is improved by 6.3 percent compared with the scheme of adopting the forced feeding equipment with the push rod, and the product percent of pass is improved by 5.5 percent compared with the scheme of adopting the forced feeding equipment with the helical blade;

during iron making, the consumption of raw materials per ton of iron is reduced by 3.2% compared with the consumption of raw materials per ton of iron produced by the prior art, by 5.2% compared with the consumption of raw materials per ton of iron produced by adopting a scheme of forced feeding equipment with a push rod, and by 4.5% compared with the consumption of raw materials per ton of iron produced by adopting a scheme of forced feeding equipment with a helical blade;

during copper smelting, the consumption of raw materials for producing each ton of copper is reduced by 2.7 percent compared with the consumption of raw materials for producing each ton of copper in the prior art, by 4.6 percent compared with the consumption of raw materials for producing each ton of copper by adopting a scheme of forced feeding equipment with a push rod, and by 3.8 percent compared with the consumption of raw materials for producing each ton of copper by adopting a scheme of forced feeding equipment with a helical blade;

when the solid fuel is gasified, the solid fuel consumption per cubic meter of gas produced by the gasification furnace is reduced by 2.6 percent compared with the solid fuel consumption per cubic meter produced by the prior art, 4.1 percent compared with the solid fuel consumption per cubic meter produced by adopting the scheme of the forced feeding equipment with the push rod, and 3.3 percent compared with the solid fuel consumption per cubic meter produced by adopting the scheme of the forced feeding equipment with the helical blade.

The inventor carefully researches and discovers that because the powdery raw material has viscosity, if the blowing gas is not input into the raw material feeding pipeline, the powdery raw material input into the hearth from the raw material feeding pipeline has some powder agglomeration conditions, after the agglomerated powder enters the hearth, some powder cannot be blown away by high-temperature gas flow in the hearth, the surface layer of the powder agglomerate is rapidly melted to form a powder agglomerate coated by a layer of molten liquid, the powder agglomerate coated by the molten liquid is more difficult to be blown away in the gas flow in the hearth, and the mass transfer and heat transfer reaction speed of the powder in the powder agglomerate and the external high-temperature gas flow is very slow, so that the following adverse effects are caused:

in the production of glass, the powdery raw material is generally a powdery glass raw material. The powder inside the glass raw material powder agglomerate coated by the molten liquid is not sufficiently melted, becomes particles which are not sufficiently melted and is discharged out of a hearth, and in products such as finally-formed flat glass or bottle glass and the like, inclusion defects in the glass products are formed, so that the glass products become unqualified products;

in iron making, the powdered raw material comprises iron ore fines, a powdered flux mineral, typically limestone. The high-temperature gas in the hearth contains CO and H₂The powdery raw materials are fully dispersed in the high-temperature reducing gas, the heat and mass transfer efficiency is very high, the powdery raw materials can be rapidly melted into a liquid state, and liquid iron and molten slag are reduced and separated out and are discharged from a liquid discharge port. However, the mass transfer and heat transfer reaction speed of the iron ore powder in the powder lot group wrapped by the molten liquid and the external high-temperature reducing gas is very low, and the iron contained in the iron ore powder is not reduced and extracted sufficiently, so that the iron ore powder is changed into slag and discharged out of a hearth;

during copper smelting, the powdery raw materials comprise copper sulfide concentrate powder and a powdery flux. The powdery raw materials are fully dispersed in high-temperature gas in a hearth, and the reactions of oxidation desulfurization, melting, slagging and the like can be completed within 2-3 seconds to form copper matte and slag, and the copper matte and the slag are discharged from a liquid outlet. However, the reaction speed of mass transfer and heat transfer between the copper sulfide concentrate in the powder lot wrapped by the molten liquid and the external high-temperature gas is very low, and the copper sulfide concentrate and the external high-temperature gas cannot react sufficiently to form copper matte, so that the copper matte becomes slag and is discharged from a liquid discharge port;

in the gasification of solid fuels, the pulverized raw material (or pulverized solid fuel) generally includes pulverized coal, pulverized biomass fuel. The ash contained in the surface layer of the solid fuel powder agglomerate which is not blown away is rapidly melted in the high-temperature hearth to form the powder agglomerate coated by a layer of molten liquid, and the solid fuel in the powder agglomerate is discharged out of the hearth along with the melted ash without being fully gasified into high-temperature fuel gas.

If the purge gas is continuously input into the raw material feeding pipeline which is feeding, the purge gas plays a role in impacting and blowing away the powder mass when entering the raw material feeding pipeline, so that the powdery raw material is fully dispersed in the high-temperature airflow in the hearth, fine powder particles are fully contacted with the high-temperature airflow, the heat and mass transfer speed is very high, and the glass production, iron making, copper smelting or solid fuel gasification and the like can respectively obtain the following more sufficient reactions:

when glass is produced, fine glass raw material powder particles are fully contacted with high-temperature airflow, so that a melting reaction can be fully performed to form qualified molten glass, the defect of inclusion caused by powder agglomeration is avoided, and the product percent of pass is improved;

during ironmaking, fine ironmaking powder particles are fully contacted with high-temperature reducing airflow, the reaction speed is high, iron in the raw materials can be fully reduced and extracted, and raw material waste caused by powder agglomeration is avoided;

during copper smelting, fine copper smelting powder particles are fully contacted with high-temperature airflow, the reaction speed is high, and copper sulfide concentrate can fully perform reactions such as oxidative desulfurization, melting, slagging and the like, so that copper contained in the copper sulfide concentrate is fully converted into copper matte, and the copper matte is prevented from being converted into slag to cause raw material waste;

when the solid fuel is gasified, the fine powdery solid fuel particles are fully contacted with the high-temperature oxygen-containing gas, the reaction speed is high, and the gasification can be fully generatedContaining CO and H₂The high-temperature fuel gas avoids fuel waste caused by agglomeration of the powdery solid fuel.

Therefore, the blowing gas is input into the raw material feeding pipeline, so that the powdery raw material can be fully dispersed in the high-temperature airflow in the hearth, the high-temperature reaction is more sufficient, and the unexpected technical effect is achieved.

Although the problem of blocking can be solved to the scheme that adopts forced feeding equipment, two kinds of forced feeding equipment all have the extruded effect to the powder, can increase the powder agglomeration, and especially the forced feeding equipment that has the push rod, the extrusion effect to the powder is bigger, causes the phenomenon of powder agglomeration more serious. Therefore, the present invention preferably uses a purge gas.

Drawings

The flying powder melting furnace and the beneficial technical effects thereof are explained in detail below with reference to the accompanying drawings and the detailed embodiments.

Fig. 1 is a schematic structural diagram of a first embodiment of the present invention.

Fig. 2 is a schematic structural diagram of a second embodiment of the present invention.

Fig. 3 is a schematic structural diagram of a third embodiment of the present invention.

Fig. 4 schematically shows a detail of the area indicated by the dashed square in fig. 3.

Fig. 5 schematically shows details of the operation of the forced feeding apparatus in fig. 4.

Fig. 6 is a schematic structural diagram of a fourth embodiment of the present invention.

Detailed Description

Example 1

Referring to fig. 1, fig. 1 shows a flying powder melting furnace, which comprises a raw material input device 1, a raw material feeding pipeline 2, a feeding hole 3, a gas inlet 7, a hearth 5, a furnace wall 6, a gas outlet 4, an oxygen-containing gas input device 10 and an exhaust device 9; the gas inlet 7 is communicated with an oxygen-containing gas input device 10, and the gas outlet 4 is communicated with an exhaust device 9; the raw material feeding pipeline 2 comprises an outlet end 11 and an inlet end 12, the outlet end 11 is communicated with the feeding hole 3, and the inlet end 12 is communicated with the raw material input equipment 1; the raw material feed pipe 2 is provided with a purge gas inlet 13.

Compared with the prior art, as the raw material feeding pipeline 2 is provided with the scavenging gas inlet 13, scavenging gas can be fed into the hearth 5 together with the powdery raw material from the raw material feeding pipeline 2, the scavenging gas has a cooling effect on the inner wall 14 of the feeding hole, the temperature of the inner wall 14 of the feeding hole can be reduced to be lower than the melting temperature of the raw material (or ash contained in solid fuel), and the powdery raw material adhered to the inner wall 14 of the feeding hole is prevented from being melted and bonded; moreover, the purge gas has a purging effect on the inner wall 14 of the feed inlet, so that the powdery raw material is prevented from being adhered to the inner wall 14 of the feed inlet. After the measures are taken, the problem that the feed inlet 3 is blocked is well solved.

Example 2

Referring to FIG. 2, FIG. 2 shows a flying powder melting furnace which is substantially the same in structure as in example 1 except that a purge gas inlet 13 is connected to a purge gas inlet pipe 15; a valve 16 is arranged on the purge gas feed line 15.

Example 3

Referring to fig. 3, 4, 5, the details of the area indicated by the dashed box in fig. 3 refer to fig. 4. FIG. 3 shows a flying powder melting furnace, which comprises a raw material input device 1, a raw material feeding pipeline 2, a feeding hole 3, an air inlet 7, a hearth 5, a furnace wall 6, an air outlet 4, an oxygen-containing gas input device 10 and an exhaust device 9; the gas inlet 7 is communicated with an oxygen-containing gas input device 10, and the gas outlet 4 is communicated with an exhaust device 9; the raw material feeding pipeline 2 comprises an outlet end 11 and an inlet end 12, the outlet end 11 is communicated with the feeding hole 3, and the inlet end 12 is communicated with the raw material input equipment 1; the feed inlet 3 is provided with a forced feeding device.

The forced feeding equipment comprises a push rod 17, a rod containing cavity 18, a piston 19 and a driving mechanism 20 for pushing the piston 19 to reciprocate; the rod accommodating cavity 18 is connected with the inlet end 12 of the raw material feeding pipeline 2, and the outer diameter of the push rod 17 is matched with the inner diameter of the raw material feeding pipeline 2; the push rod 17 comprises a tail end 21 and a top end 22; one end of the piston 19 is connected with the tail end 21 of the push rod 17, and the other end is connected with the driving mechanism 20; the top end 22 of the push rod 17 retreats into the rod containing cavity 18 (shown in figure 4) when reaching the reciprocating retraction end position, and reaches the feed port 3 (shown in figure 5) when reaching the reciprocating advancement end position; the rear end 21 of the push rod 17 is located in the rod receiving chamber 18 when the reciprocating push end position is reached (as shown in fig. 5).

The forced feeding equipment is equipment for pushing the powdery raw material into the feeding hole 3 from the raw material feeding pipeline 2 by mechanical thrust, and the push rod 17 can carry out continuous reciprocating motion to forcibly push the powdery raw material entering the raw material feeding pipeline 2 from the inlet end 12 into the feeding hole 3; when the inner wall 14 of the feeding hole 3 is provided with the melt, the push rod 17 can forcibly push the powdery raw material and the melt into the hearth 5 together, so that the melt is prevented from being stuck and blocked.

Example 4

Referring to FIG. 6, FIG. 6 shows a powder flying melting furnace which is substantially the same as that of example 3, except that the forced feeding apparatus of example 4 comprises a spiral blade 23 in the form of a spring and a shaft 24 rotated by a mechanical drive, the spiral blade 23 being disposed in the raw material feed pipe 2, the shaft 24 being disposed on the center line of the spiral blade 23, the shaft 24 being fixedly connected to the spiral blade 23, and the difference between example 3 and the forced feeding apparatus.

The mechanism for driving the shaft 24 to rotate is a motor 25, and the shaft 24 is connected with the motor 25.

The forced feeding device is also a device for pushing the powdery raw material into the feeding hole 3 from the raw material feeding pipeline 2 through mechanical thrust, the helical blade 23 is pushed to push the powdery raw material to the feeding hole 3 by the rotating direction of the shaft 24, and when the inner wall 14 of the feeding hole 3 is provided with a melt, the helical blade 23 can force the powdery raw material and the melt to push the furnace 5 together, so that blockage can be avoided.

In the above embodiment, the exhaust device 9 generally further includes a waste heat utilization device for recovering heat of the high-temperature gas, and the oxygen-containing gas input device 10 generally further includes a preheating device for preheating the oxygen-containing gas to increase the temperature of the furnace; the feed inlet 3, the air inlet 7 and the air outlet 4 are respectively arranged on the furnace wall 6; the raw material input device 1 is used for inputting powdery raw materials into a hearth 5 through a feed inlet 3; the raw material input device 1 can adopt a device for feeding the powdery material, such as an impeller feeder, a screw feeder and the like, and can also adopt other conventional devices as long as the powdery material can be fed into the inlet end 12 of the raw material feeding pipeline 2; the powder flying melting furnace also comprises a liquid outlet 8, the liquid outlet 8 is positioned at the bottom of the hearth 5 or near the bottom, and the molten dust adhered to the furnace wall 6 flows downwards to the liquid outlet 8 under the action of gravity and is output; the hearth 5 is basically cylindrical, and the air inlet 7 is positioned at the upper part of the cylindrical hearth 5 and is tangentially connected with the cylindrical hearth; the air outlet 4 is positioned at the lower end of the cylindrical hearth 5 and is tangentially connected with the cylindrical hearth; the feed opening 3 is located substantially in the center of the top of the cylindrical furnace 5.

When the embodiment is used for producing glass, ironmaking and copper smelting, the oxygen-containing gas can be air or oxygen-enriched air, the fuel can be powdery solid fuel, gas fuel or liquid fuel, if the powdery solid fuel or the gas fuel is adopted, the powdery solid fuel can be mixed in the powdery raw material and is input into a hearth from a raw material feeding pipeline, and a gas fuel input port is arranged on the raw material feeding pipeline and can be used for inputting the gas fuel, so that the embodiment is very convenient. When the embodiment is used for iron making, the pulverized solid fuel is usually pulverized coal.

When the above embodiment is used for gasifying solid fuel, the oxygen-containing gas usually also contains a part of steam, and if the heating value of the fuel gas needs to be increased, a mixed gas of oxygen and steam can be used.

The present invention is not limited to the above-described embodiments. Appropriate changes and modifications to the embodiments described above will be apparent to those skilled in the art in light of the above disclosure and teachings, and are intended to be included within the scope of the utility model as claimed. Certain terminology is used in the description for convenience only and is not limiting.

Claims (9)

1. The utility model provides a powder flight melting furnace, it includes raw materials input device, raw materials charge-in pipeline, feed inlet, air inlet, furnace, oven, gas outlet, oxygen-containing gas input device and exhaust apparatus, its characterized in that: the feed inlet, the air inlet and the air outlet are respectively arranged on the furnace wall; the raw material feeding pipeline comprises an outlet end and an inlet end, the outlet end is communicated with the feeding hole, and the inlet end is communicated with the raw material input equipment; and a purge gas inlet is arranged on the raw material feeding pipeline.

2. The flying powder melting furnace as claimed in claim 1, wherein the purge gas input port arranged on the raw material feeding pipeline is connected with a purge gas input pipeline; and a valve is arranged on the purge gas input pipeline.

3. The utility model provides a powder flight melting furnace, it includes raw materials input device, raw materials charge-in pipeline, feed inlet, air inlet, furnace, oven, gas outlet, oxygen-containing gas input device and exhaust apparatus, its characterized in that: the feed inlet, the air inlet and the air outlet are respectively formed in the furnace wall; the raw material feeding pipeline comprises an outlet end and an inlet end, the outlet end is communicated with the feeding hole, and the inlet end is communicated with the raw material input equipment; and the feed inlet is provided with a forced feeding device, and the forced feeding device is a device for pushing the powdery raw material into the feed inlet from the raw material feed pipeline through mechanical thrust.

4. The powder flight melting furnace of claim 3, characterized in that: the forced feeding equipment comprises a push rod, a rod containing cavity, a piston and a driving mechanism for pushing the piston to reciprocate; the rod accommodating cavity is connected with the inlet end of the raw material feeding pipeline, and the outer diameter of the push rod is matched with the inner diameter of the raw material feeding pipeline; one end of the piston is connected with the tail end of the push rod, and the other end of the piston is connected with the driving mechanism.

5. The flying powder melting furnace of claim 4, wherein: the top end of the push rod retreats into the rod containing cavity when reaching the retraction end position of the reciprocating motion and reaches the feed inlet when reaching the propulsion end position of the reciprocating motion.

6. The flying powder melting furnace of claim 4, wherein: the tail end of the push rod is positioned in the rod containing cavity when reaching the pushing terminal position of the reciprocating motion.

7. The flying powder melting furnace of claim 3, wherein: the forced feeding device comprises a spring-shaped helical blade and a shaft which is driven by a machine to rotate, wherein the helical blade is positioned in the raw material feeding pipeline, the shaft is positioned on the central line of the helical blade, and the shaft is fixedly connected with the helical blade.

8. The flying powder melting furnace as claimed in any one of claims 1 to 7, wherein: the powder flying melting furnace also comprises a liquid outlet; the liquid outlet is positioned at or near the bottom of the hearth.

9. The flying powder melting furnace as claimed in any one of claims 1 to 7, wherein: the raw material input device comprises an impeller feeder or a screw feeder.

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