CN209989446U - Smelting furnace - Google Patents

Abstract

The utility model discloses a smelting furnace, include: the furnace body is provided with a charging hole, a primary air port, a secondary air port, a discharge hole, a slag hole and a flue, and the secondary air port is positioned above the primary air port; the side-blowing spray gun is communicated with the primary air port; a swirl lance for generating a swirling jet-like gas flow, the swirl lance being in selective communication with the primary tuyere. According to the utility model discloses a smelting furnace, material are at the smelting in-process, and the oxygen boosting air can be through the side-blown spray gun drum go into the molten bath, simultaneously, can go into the natural gas through the whirl spray gun drum, and the natural gas is direct to burn in the molten bath exothermic, and heat transfer mass transfer effect is better, has guaranteed the heat balance in the furnace body, and the energy consumption is low, the thermal efficiency is high. In addition, the furnace body can also be provided with a slag chamber, the slag chamber is connected into the flue through a smoke pipe, and the smoke of the slag chamber and the main smoke are converged into subsequent waste heat recovery.

Description

Smelting furnace

Technical Field

The utility model relates to a metallurgical technology field particularly, relates to a smelting furnace.

Background

The side-blown converter in the related technology is mainly applied to the fields of high lead slag reduction, copper concentrate smelting, waste solid treatment and the like, and obtains good economic and social benefits. For example, in the copper smelting process, oxygen-enriched air with the concentration of 75-80% is blown in through a lower air outlet to ensure that a molten pool is vigorously stirred, raw materials and oxygen in a tumbling molten pool are fully contacted and mixed, the reaction among gas, liquid and solid phases is rapidly completed, and a large amount of heat is released to maintain the heat balance. In the reduction smelting (such as high lead slag reduction, copper tailing reduction and the like), a large amount of coke or pulverized coal (not only serving as a reducing agent but also used for supplementing heat) is added into raw materials to maintain the heat balance in the furnace. Particularly in the copper tailing reduction iron extraction process, the temperature and the reducing atmosphere in the furnace are key factors for ensuring the normal operation of the side blown furnace, and the reducing atmosphere and the temperature in the furnace can not be ensured by simply adding coal and coke, so that the energy consumption is high, and the heat efficiency is low.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a smelting furnace, reducing atmosphere and temperature in the stove can be guaranteed to the smelting furnace, and the energy consumption is low, the thermal efficiency is high.

According to the utility model discloses smelting furnace, include: the furnace body is provided with a charging hole, a primary air port, a secondary air port, a discharge hole, a slag hole and a flue, and the secondary air port is positioned above the primary air port; the side-blowing spray gun is communicated with the primary air port; a swirl lance for generating a swirling jet-like gas flow, the swirl lance being in selective communication with the primary tuyere.

According to the utility model discloses smelting furnace, material are at the smelting in-process, and the oxygen boosting air can be through the side-blown spray gun drum go into the molten bath, simultaneously, can go into the natural gas through the whirl spray gun drum, and the natural gas is direct to be burnt exothermic in the molten bath, and heat and mass transfer effect is better, has guaranteed the thermal balance in the furnace body, and the energy consumption is low, the thermal efficiency is high.

In addition, the smelting furnace according to the embodiment of the utility model also has following additional technical characteristics:

according to some embodiments of the invention, the smelting furnace further comprises: the side-blowing air gun is communicated with the primary air port through the second interface, and the rotational flow air gun is inserted in the third interface and is selectively communicated with the primary air port.

Further, a tuyere sealing ball is arranged in the tuyere tee, a first control channel is arranged between the second interface and the third interface, and the swirl spray gun is movably inserted into the third interface between a pulling-out position and an inserting position, wherein the tuyere sealing ball is positioned in the third interface to disconnect the swirl spray gun and the primary tuyere when the swirl spray gun is at the pulling-out position; the tuyere sealing ball is located in the first control passage when the swirl lance is in the insertion position to allow the swirl lance to communicate with the primary tuyere.

Advantageously, the swirl lance is inserted into the primary tuyere when in the inserted position.

In some embodiments of the present invention, the melting furnace further comprises: and the connector is connected with the outer end of the tuyere tee joint, and the swirl spray gun penetrates through the connector to be inserted into the third interface.

Furthermore, a second control channel and a connecting sealing ball are arranged in the connector, and the connecting sealing ball is positioned in the second control channel when the swirl spray gun is positioned in the third interface.

In some embodiments of the present invention, an air inlet water jacket is disposed in the primary air inlet, and the first interface is connected to the air inlet water jacket.

According to some embodiments of the invention, the swirl lance comprises: a spray gun body; the spinning disk, the spinning disk is established the spray gun is originally internal and round the axis spiral of spray gun body extends.

Further, the inner end of the spray gun body is provided with a sharp angle, and the included angle between the sharp angle and the axis of the spray gun body ranges from 15 degrees to 30 degrees.

According to some embodiments of the utility model, the top of furnace body is equipped with emergent spray gun, emergent spray gun can insert with reciprocating and establish on the furnace body.

According to some embodiments of the utility model, the furnace body includes: a hearth defining a melt chamber and a slag chamber therein, the melt chamber having the discharge port and the slag chamber having the slag outlet, the slag outlet being located above the discharge port; the furnace middle section is positioned above the furnace hearth, and the primary air port is arranged on the side wall of the furnace middle section; the furnace upper section is positioned above the furnace upper section, and the secondary tuyere is arranged on the side wall of the furnace upper section; the furnace top is positioned above the upper section of the furnace, the charging opening and the flue are arranged on the furnace top, and the slag chamber is communicated with the flue.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

Fig. 1 is a schematic structural view of a furnace body of a smelting furnace according to an embodiment of the present invention;

fig. 2 is a schematic view of a partial structure of a melting furnace according to an embodiment of the present invention;

fig. 3 is a schematic view of a partial structure of a melting furnace according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a swirl lance of a smelting furnace according to an embodiment of the present invention.

Reference numerals:

the furnace comprises a furnace body 100, a furnace hearth 1, a furnace middle section 2, a slag chamber 3, a furnace upper section 4, a furnace top 5, an emergency spray gun 6, a flue 7, a charging hole 8, a primary air port 9, a secondary air port 10, a discharge port 11, a slag hole 12, a smoke tube 13, an air port tee joint 20, a tee joint body 21, a first joint 22, a third joint 23, a second joint 24, an air port sealing ball 25, a connector 30, a connecting body 31, a tee joint 32, a swirl joint 33, a connecting sealing ball 34, a swirl spray gun 40, a spray gun body 41, a swirl sheet 42 and an air port water jacket 50.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

A smelting furnace according to an embodiment of the present invention is described below with reference to the accompanying drawings. The smelting furnace can be used for treating materials or slag needing melting reduction, such as lead slag, copper tailings and the like.

As shown in fig. 1-4, the smelting furnace according to the embodiment of the present invention includes: furnace body 100, side-blowing lances, and swirl lances 40.

Specifically, the furnace body 100 has a charging port 8, a primary tuyere 9, a secondary tuyere 10, a discharge port 11, a slag hole 12, and a flue 7, and the secondary tuyere 10 is located above the primary tuyere 9. The side-blowing lance is in communication with the primary tuyere 9. The swirl lances 40 are used to generate a swirling jet-like gas flow, and the swirl lances 40 are selectively in communication with the primary tuyere 9.

Thus, the material is fed into the furnace body 100 through the feed port 8 and subjected to a reduction reaction at a high temperature under a high reducing atmosphere. Oxygen-enriched air and natural gas are blown into the slag layer through the primary air port 9 to provide heat for the melt and ensure the reducing atmosphere. The molten metal and slag produced by the reduction reaction are gradually layered in the furnace body 100 due to the difference in density. Wherein slag is discharged by overflowing through a slag outlet 12 and metal melt is discharged through a discharge outlet 11.

In the above process, oxygen-enriched air is blown in through the side-blowing lance at the primary tuyere 9. The tail part of the side-blown spray gun is connected with the rotational flow spray gun 40, so that the natural gas and the oxygen are fully mixed in the molten pool, and directly combusted in the molten pool to release heat, and the temperature in the furnace body 100 is ensured. That is, the fine coal added together with the materials and the flux only functions as a reducing agent and ensures a reducing atmosphere, and the temperature in the furnace body 100 is mainly ensured by submerged combustion of natural gas in the molten pool.

According to the utility model discloses smelting furnace, material are at the smelting in-process, and the oxygen boosting air can be through the side-blown spray gun drum go into the molten bath, simultaneously, can go into the natural gas through whirl spray gun 40 drum, and the natural gas is direct to be burnt exothermic in the molten bath, and heat and mass transfer effect is better, has guaranteed the thermal balance in the furnace body 100, and the energy consumption is low, the thermal efficiency is high.

According to some embodiments of the present invention, as shown in fig. 2 and 3, the smelting furnace further comprises: and a tuyere tee 20. The tuyere three-way 20 has a first port 22, a second port 24 and a third port 23 which are communicated with each other, the first port 22 is communicated with the primary tuyere 9, the side-blowing lance is communicated with the primary tuyere 9 through the second port 24, the swirl lance 40 is inserted in the third port 23, and the swirl lance 40 is selectively communicated with the primary tuyere 9. Thus, the structure can be simplified. Wherein, the on-off of the swirl spray gun 40 and the primary air port 9 can be controlled by controlling whether the swirl spray gun 40 sprays natural gas or not.

Further, as shown in fig. 2 and 3, a tuyere sealing ball 25 is arranged in the tuyere three-way 20, a first control channel is arranged between the second connector 24 and the third connector 23, and the swirl spray gun 40 is movably inserted in the third connector 23 between the pulling-out position shown in fig. 2 and the inserting position shown in fig. 3. When the swirl spray gun 40 is pulled out, the tuyere sealing ball 25 is positioned in the third interface 23, namely, the tuyere sealing ball 25 is positioned at the air outlet front end of the swirl spray gun 40 so as to disconnect the swirl spray gun 40 and the primary tuyere 9; when the swirl lance 40 is in the inserted position, the tuyere sealing ball 25 is located in the first control passage to allow the swirl lance 40 to communicate with the primary tuyere 9.

Advantageously, as shown in fig. 3, the swirl-flow lances 40 are inserted into the primary tuyeres 9 in the inserted position, so as to further ensure the stirring and heat transfer action of the natural gas on the bath.

For example, the axis of the first port 22 coincides with the axis of the third port 23, the axis of the second port 24 extends obliquely with respect to the axis of the third port 23, and the first control passage extends obliquely from the outside to the inside and upward. Therefore, the tuyere sealing ball 25 can smoothly move to the first control channel when the swirl spray gun 40 is inserted into the primary tuyere 9, and the tuyere sealing ball 25 can fall back under the action of gravity when the swirl spray gun 40 is pulled out of the primary tuyere 9.

It should be noted that, in the description of the present invention, "inner" refers to a side toward the center of the furnace body 100, and similarly, "outer" refers to a side away from the center of the furnace body 100.

In some embodiments of the present invention, as shown in fig. 2 and 3, the melting furnace further includes: and a connector 30, wherein the connector 30 is connected with the outer end of the tuyere tee 20, and the swirl spray gun 40 penetrates through the connector 30 to be inserted into the third port 23. Therefore, the swirl spray gun 40 is conveniently connected with the tuyere three-way pipe 20, and the sealing performance of the swirl spray gun 40 when the swirl spray gun is not in the third connector 23 is favorably ensured.

Further, as shown in fig. 2 and 3, a second control passage and a connecting sealing ball 34 are provided in the connector 30, and the connecting sealing ball 34 is located in the second control passage when the swirl lance 40 is located in the third port 23. For example, the second control passage extends obliquely from outside to inside and upward, so that the connecting sealing ball 34 can smoothly move to the second control passage when the swirl lance 40 is inserted into the tuyere stock 20, and the tuyere sealing ball 25 can fall back under gravity when the swirl lance 40 is pulled out of the tuyere stock 20.

In some embodiments of the present invention, as shown in fig. 2 and 3, a tuyere water jacket 50 may be disposed in the primary tuyere 9, and the first interface 22 is connected to the tuyere water jacket 50, so as to control the temperature at the primary tuyere 9.

According to some embodiments of the present invention, as shown in fig. 4, the swirl lance 40 comprises: a lance body 41 and a swirler 42. The swirl plate 42 is provided in the torch body 41, and the swirl plate 42 extends spirally around the axis of the torch body 41. Therefore, the rotational flow sheet 42 and the axis of the spray gun body 41 form a certain angle, and the natural gas can be guaranteed to be sprayed out in a rotary spraying manner towards the outlet, so that the natural gas is dispersed in a molten pool and is fully mixed and combusted with oxygen-enriched oxygen.

Further, as shown in FIG. 4, the inner end of lance body 41 has a sharp angle, i.e., the inner end of lance body 41 is tapered at an angle in the range of 15-30 with respect to the axis of lance body 41. This facilitates ejection of the tuyere sealing ball 25 when inserting the swirl lance 40.

Wherein, the tail (i.e. the outer end) of the swirl lance 40 can be provided with an observation mirror for observing the combustion effect.

According to some embodiments of the present invention, as shown in fig. 1, the top of the furnace body 100 is provided with the emergency spray gun 6, and the emergency spray gun 6 is inserted on the furnace body 100 so as to move up and down. The emergency spray gun 6 is used for introducing pulverized coal into the furnace body 100, and plays roles of emergency heat preservation and foam slag generation prevention. In particular, when used for thermal insulation, the emergency lance 6 does not need to be inserted inside the bath; when the foam slag is generated, the emergency spray gun 6 is inserted into the slag layer, so that the safe operation of the smelting furnace is effectively guaranteed.

It will be appreciated that whether the emergency lance 6 is used can be selected by controlling whether the emergency lance 6 ejects the pulverised coal.

According to some embodiments of the present invention, as shown in fig. 1, the furnace body 100 includes: a furnace hearth 1, a furnace middle section 2, a furnace upper section 4 and a furnace top 5. The hearth 1 defines therein a melt chamber having a discharge port 11 and a slag chamber 3 having a slag outlet 12, the slag outlet 12 being located above the discharge port 11. The furnace middle section 2 is positioned above the furnace hearth 1, the primary tuyere 9 is arranged on the side wall of the furnace middle section 2, and a molten pool is formed in the furnace middle section 2. The furnace upper section 4 is positioned above the furnace middle section 2, and the secondary tuyere 10 is arranged on the side wall of the furnace upper section 4. The furnace top 5 is positioned above the furnace upper section 4, the charging opening 8 and the flue 7 are arranged on the furnace top 5, and the slag chamber 3 is communicated with the flue 7. The flue gas of the slag chamber 3 is introduced into a flue 7 (namely a boiler interface) and is used as a part of tertiary air, and the tertiary air is mixed with the main flue gas and then enters the boiler, so that the heat of the flue gas is fully utilized.

A melting furnace according to an embodiment of the present invention is described below with reference to the accompanying drawings.

According to the utility model discloses side-blown reduction smelting furnace includes furnace hearth 1, furnace middle-section 2, slag chamber 3, stove upper segment 4, furnace roof 5, emergent spray gun 6, flue 7, charge door 8, primary tuyere 9, secondary tuyere 10, discharge port 11, slag notch 12, tobacco pipe 13, wind gap tee bend 20, connector 30, whirl spray gun 40 and wind gap water jacket 50.

The tuyere three-way 20 comprises a three-way body 21, a first interface 22, a third interface 23, a second interface 24 and a tuyere sealing ball 25. The connector 30 includes a connecting body 31, a three-way connection 32, a swirl connection 33, and a connecting sealing ball 34. The third connector 23 is connected with a three-way connector 32, and the swirl connector 33 is connected with a swirl spray gun 40.

The swirl lance 40 comprises a lance body 41 and a swirl plate 42, wherein the swirl plate 42 is welded on the inner side of the lance body 41 and is made of heat-resistant stainless steel 310S.

The materials are added into the furnace through a feed inlet 8 on the furnace top 5, and reduction reaction is carried out under high temperature and high reducing atmosphere. Oxygen-enriched air and natural gas are blown into the slag layer through the primary air port 9 to provide heat for the melt and ensure the reducing atmosphere. The molten metal and slag produced by the reduction reaction are gradually layered in the hearth 1 due to the difference in density. Wherein, the slag overflows and is discharged through a slag outlet 12 at the end part of the slag chamber 3, and the metal melt is discharged through a discharge hole 11. The high-temperature flue gas of the slag chamber 3 is connected to the flue 7 through the flue pipe 13, and enters the waste heat boiler after being merged with the main flue gas.

The emergency spray gun 6 on the furnace top 5 adopts a sleeve type structure, cooling air is introduced into the outer layer, pulverized coal is introduced into the inner layer, the emergency spray gun is not applicable under normal conditions, and the emergency spray gun is directly inserted into a molten pool in the furnace when heat supplement is needed.

The primary tuyere 9 is immersed in the melt to a depth of 600mm to 800 mm. The secondary tuyere 10 blows oxygen-enriched air at a distance of about 4m from the primary tuyere 9 in the up-down direction. The secondary tuyere 10 is in strong reducing atmosphere, the flue gas is secondarily combusted at the position to emit a large amount of heat, and the position is a high-temperature area.

The furnace middle section 2 is of a water jacket structure, and the tuyere water jacket 50 is fixed on the water jacket of the furnace middle section 2 through bolts.

In case there is enough fine coal in the burden (material: fine coal 1:1), the primary tuyere 9 can be blown into the furnace only through the second port 24 to provide the heat required for the reduction in the furnace and to ensure the reducing atmosphere. However, in this case, the thermal efficiency is low, and a large amount of heat enters the flue gas, resulting in a complicated subsequent flue gas treatment process. In order to reduce the coal blending rate and improve the heat efficiency, a swirl lance 40 may be inserted at the primary tuyere 9. The natural gas and the oxygen-enriched air are fully mixed and combusted in the molten pool, and the combustion flame and the materials are subjected to composite heat transfer (direct heat conduction and heat radiation), so that the efficiency is higher. As shown in fig. 3, the swirl lances 40 pass through the connector 30, the tuyere stock 20 and the tuyere water jacket 50, respectively.

The tuyere sealing ball 24 of the tuyere stock 20 may be worn and not normally dropped down when the swirl lance 40 is frequently inserted and withdrawn. And the connecting sealing ball 33 of the connector 30 is far away from the high temperature area and can be used as a spare for the tuyere sealing ball 24 of the tuyere tee 20.

The emergency lance 6 of the furnace roof 5 need not be inserted inside the molten bath when used for holding heat; when the foam slag is generated, the emergency spray gun 6 is inserted into the slag layer, and effective guarantee is provided for the safe operation of the furnace.

According to the smelting furnace provided by the embodiment of the utility model, oxygen-enriched air is blown into the primary tuyere 9 during normal production, and natural gas can be introduced if heat preservation or temperature raising is needed; the primary tuyere 9 can be cooled by a copper water jacket; an emergency spray gun is arranged on the furnace top 5 and can spray pulverized coal; and a tertiary air port is arranged at the interface of the smelting furnace and the boiler.

Therefore, in the process of smelting materials, oxygen-enriched primary air is blown into a molten pool through side-blown spray guns, the side-blown spray guns are protected by copper water jackets, and a plurality of groups of side-blown spray guns are arranged; the rotational flow spray gun 40 is opened and closed according to the requirements of the furnace conditions; the furnace top 5 is provided with a plurality of emergency spray guns 6 for emergency heat preservation and foam slag generation prevention; and tertiary air is blown into the interface of the smelting furnace and the boiler to combust redundant CO and reduce the temperature. The smelting furnace directly conducts heat to the inside of a melt body in a composite mode through immersion combustion of the swirl spray gun 40 and heat conduction, radiation, convection and the like, so that the heat efficiency is improved, and meanwhile, the emergency spray gun 6 at the furnace top 5 is configured, so that the safe operation of the furnace is ensured.

According to the utility model discloses smelting furnace, emergency measure is complete, and the energy consumption is low, and the thermal efficiency is high, can guarantee that the safety of reduction smelting technology effectively goes on.

Other constructions and operations of the smelting furnace according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, "first feature" and "second feature" may include one or more of the features, and the first feature may be "on" or "under" the second feature, and may include the first and second features being in direct contact, or the first and second features being in contact not directly but via another feature therebetween. The first feature being "on," "over" and "above" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature.

It is to be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted", "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; either directly or indirectly through intervening media, or through the communication between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "a specific embodiment," "an example" or "some examples" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (11)

1. A smelting furnace, characterized by comprising:

the furnace body is provided with a charging hole, a primary air port, a secondary air port, a discharge hole, a slag hole and a flue, and the secondary air port is positioned above the primary air port;

the side-blowing spray gun is communicated with the primary air port;

a swirl lance for generating a swirling jet-like gas flow, the swirl lance being in selective communication with the primary tuyere.

2. The smelting furnace of claim 1, further comprising:

the side-blowing air gun is communicated with the primary air port through the second interface, and the rotational flow air gun is inserted in the third interface and is selectively communicated with the primary air port.

3. The smelting furnace of claim 2, wherein a tuyere stock ball is provided in the tuyere stock, a first control channel is provided between the second port and the third port, and the swirl lance is movably inserted in the third port between an extracted position and an inserted position, wherein,

when the swirl spray gun is at the pulling-out position, the air port sealing ball is positioned in the third interface so as to disconnect the swirl spray gun and the primary air port;

the tuyere sealing ball is located in the first control passage when the swirl lance is in the insertion position to allow the swirl lance to communicate with the primary tuyere.

4. The smelting furnace of claim 3, wherein the swirl lances are inserted into the primary tuyere when in the insertion position.

5. The smelting furnace of claim 2, further comprising:

and the connector is connected with the outer end of the tuyere tee joint, and the swirl spray gun penetrates through the connector to be inserted into the third interface.

6. The smelting furnace of claim 5, wherein a second control passage and a connecting sealing ball are provided in the connector, the connecting sealing ball being located in the second control passage when the swirl lance is located in the third interface.

7. The smelting furnace of claim 2, wherein a tuyere water jacket is provided in the primary tuyere, and the first port is connected to the tuyere water jacket.

8. The smelting furnace of claim 1, wherein the swirl lances comprise:

a spray gun body;

the spinning disk, the spinning disk is established the spray gun is originally internal and round the axis spiral of spray gun body extends.

9. The smelting furnace of claim 8, wherein the inner end of the lance body has a pointed angle, the angle between the pointed angle and the axis of the lance body being in the range of 15 ° to 30 °.

10. The smelting furnace according to claim 1, wherein the top of the furnace body is provided with emergency lances which are inserted up and down on the furnace body.

11. The smelting furnace according to any one of claims 1 to 10, characterized by the furnace body comprising:

a hearth defining a melt chamber and a slag chamber therein, the melt chamber having the discharge port and the slag chamber having the slag outlet, the slag outlet being located above the discharge port;

the furnace middle section is positioned above the furnace hearth, and the primary air port is arranged on the side wall of the furnace middle section;

the furnace upper section is positioned above the furnace upper section, and the secondary tuyere is arranged on the side wall of the furnace upper section;

the furnace top is positioned above the upper section of the furnace, the charging opening and the flue are arranged on the furnace top, and the slag chamber is communicated with the flue.

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