Energy-saving ore melting kiln based on bubbling fluidization

Abstract

The invention discloses an energy-saving ore melting furnace based on bubbling fluidization, relates to the field of silicate ore melting and melting furnaces, and solves the problems of high specific heat energy consumption and low heat conduction and heat convection intensity of a tank furnace in the conventional melting furnace. A feeding mechanism is arranged at the upper end of a fluidization preheating section, and the lower end is connected with an ore melting section; an air-cooling air distribution plate is arranged in the fluidization preheating section, and the fluidization preheating section and the ore melting section are separated by the air-cooling air distribution plate; an air bellow is arranged on the outer side of the fluidization preheating section and communicates with the air cooling air distribution plate. The upper end of the overflow pipe is communicated with the fluidization preheating section, and the lower end is communicated with the ore melting section; a liquid outlet valve is arranged outside the ore melting section, and a hydraulic bottom plate is arranged at the bottom; and a burner is arranged in the kiln. By enhancing the heat exchange between the ore and the heat source, reducing the energy consumption of the kiln, prolonging the retention time of the molten ore, ensuring the melting time and realizing homogenization, the quality and characteristics of the basalt fiber product are improved, and the production variety of the basalt fiber product is increased.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of silicate ore melting and smelting kiln, in particular to an energy-saving ore smelting kiln based on bubbling fluidization. BACKGROUND

[0002] At present, the method for heating and melting the raw material of silicate ore (including basalt, andesite basalt, basanite, diabase, gabbro, coarse-grained basalt, amphibolite, andesite porphyrite, and other volcanic magma rocks) to produce fibers with high strength, high chemical stability, high thermal stability, and good electrical insulation is mainly complete direct electric heating, natural gas or liquid (such as heavy oil) combustion, electric induction heating, or a combination of electric heating and natural gas combustion. The smelting furnace devices for heating and melting include vertical furnaces (cupola furnaces), Pouch furnaces, tank furnaces, and crucibles. Although the existing methods and smelting furnaces are relatively mature and have been widely used, the specific energy consumption of heat is high, especially the poor thermal conductivity of basalt ore, which is generally not more than 1.5-2.0 W / m·K, and the heat conduction and heat convection in the tank furnace are too low. Moreover, the homogenization reaction stage of the molten body needs to be passed through, so the average residence time of basalt ore in the furnace is correspondingly extended by about 4.5-5.5 times compared with the glass batch. Based on these reasons, it is of great engineering value to develop an energy-saving kiln device and a smelting process method that can fully utilize the heat in the kiln and have a long residence time. SUMMARY

[0003] The present application is proposed to solve the problems of high specific energy consumption of heat and low heat conduction and heat convection in the tank furnace of the existing smelting furnace. The present application enhances the heat exchange between the ore and the heat source, reduces the energy consumption of the ore smelting kiln, prolongs the residence time of the molten ore in the kiln, and allows sufficient time for melting and homogenization, thereby improving the quality and characteristics of basalt fiber products and increasing the product species of basalt fiber products.

[0004] The present application proposes an energy-saving ore smelting kiln based on bubbling fluidization, which specifically includes a fluidized preheating section, an ore smelting section, and a plurality of overflow pipes. The lower end of the fluidized preheating section is connected to the ore smelting section. A feeding mechanism is arranged at the upper end of the fluidized preheating section. An air-cooled cloth air distribution plate is arranged in the fluidized preheating section, which separates the fluidized preheating section and the ore smelting section. An air bellow is arranged outside the fluidized preheating section, which is in communication with the air-cooled cloth air distribution plate. A plurality of overflow pipes are uniformly distributed on the circumference of the energy-saving ore smelting kiln. The upper end of the overflow pipe is in communication with the fluidized preheating section, and the lower end is in communication with the ore smelting section. An outlet valve is arranged outside the ore smelting section, and a hydraulic bottom plate is arranged at the bottom for discharging materials. A plurality of burners are arranged in the energy-saving ore smelting kiln based on bubbling fluidization.

[0005] Further, the feeding mechanism comprises a hopper, an electromagnetic vibrating feeder and a feeding pipe, the hopper is arranged on the fluidized preheating section through a support, the lower end outlet of the hopper is opposite to the electromagnetic vibrating feeder, the feeding pipe is inserted into the fluidized preheating section through the feeding pipe inlet of the electromagnetic vibrating feeder.

[0006] Further, the fluidized preheating section is circumferentially and evenly provided with a plurality of overflow ports, the overflow ports are communicated with the overflow pipe inlets of the upper ends of the overflow pipes.

[0007] Further, the ore melting section is circumferentially and evenly provided with a plurality of insertion pipes, the lower ends of the overflow pipes are communicated with the insertion pipes; the burners are arranged on the insertion pipes.

[0008] Further, the insertion pipes are arranged on the ore melting section in an inclined manner, the inclined direction is upward, and the angle between the insertion pipes and the horizontal plane is 0°-45°.

[0009] Further, the lower end of the overflow pipe is provided with a return valve.

[0010] Further, the hydraulic bottom plate comprises two semicircular bottom plates and two hydraulic rods, the two semicircular bottom plates are symmetrically arranged at the bottom of the ore melting section and are hingedly connected with the ore melting section; one end of the hydraulic rod is connected with the semicircular bottom plate, and the other end of the hydraulic rod is connected with the ore melting section.

[0011] Further, the air cooling distribution plate comprises a steel plate, a plurality of air pipes and a plurality of air caps, the plurality of air pipes are arranged on the lower surface of the steel plate; a plurality of air pipe holes are arranged on the air pipes; the steel plate is evenly provided with a plurality of air cap inlets, the air cap is arranged on the upper surface of the steel plate and is communicated with the air cap inlet.

[0012] Further, the upper end of the fluidized preheating section is provided with a smoke exhaust port; the ore melting section is provided with an explosion-proof door and a manhole door.

[0013] Further, the fluidized preheating section is provided with a central pipe; the upper end of the central pipe is connected with the top of the fluidized preheating section, the lower end of the central pipe penetrates through the air cooling distribution plate and extends into the ore melting section; the central pipe is internally provided with a burner.

[0014] The energy-saving ore melting furnace based on bubbling fluidization has the following advantages:

[0015] (1) The energy-saving ore melting furnace based on bubbling fluidization can heat the input ore in the fluidized preheating section by using the hot flue gas of the ore melting section, so as to recover the waste heat in the hot flue gas, reduce the flue gas temperature and save energy, through the segmented design of the furnace body.

[0016] (2) The energy-saving ore smelting furnace based on bubbling fluidization, which feeds ore through the feeding pipe arranged on the furnace top, can uniformly disperse the ore to the surrounding, uniformly exchanges heat under the action of hot flue gas bubbling fluidization, and maximally utilizes the heat of the flue gas;

[0017] (3) The energy-saving ore smelting furnace based on bubbling fluidization, which can uniformly spread the preheated ore into the ore smelting liquid through the overflow pipe arranged along the circumference of the furnace, avoids accumulation and clumping, and is beneficial to rapid melting;

[0018] (4) The energy-saving ore smelting furnace based on bubbling fluidization, which can adapt to a wide range of rock feedstocks based on the operation mode of bubbling fluidization, and can use the furnace to melt the ore as long as the ore meets the sealing and fluidization requirements to a certain extent; the hydraulic bottom plate at the bottom of the furnace can realize rapid slagging and cleaning, and the cleaning and inspection operation is convenient. BRIEF DESCRIPTION OF DRAWINGS

[0019] The accompanying drawings, which form a part of this application, are included to provide a further understanding of the application, and are incorporated herein for explanation by reference. The present application will become more fully understood from the detailed description and accompanying drawings given below.

[0020] In the drawings:

[0021] Figure 1 is a right view of the energy-saving ore smelting furnace based on bubbling fluidization;

[0022] Figure 2 is a front view of the energy-saving ore smelting furnace based on bubbling fluidization;

[0023] Figure 3 is a left view of the energy-saving ore smelting furnace based on bubbling fluidization;

[0024] Figure 4 is a main sectional view of the energy-saving ore smelting furnace based on bubbling fluidization;

[0025] Figure 5 is a hydraulic bottom plate closed state schematic view of the energy-saving ore smelting furnace based on bubbling fluidization;

[0026] Figure 6 is a hydraulic bottom plate open state schematic view of the energy-saving ore smelting furnace based on bubbling fluidization;

[0027] Figure 7 is a bottom view of the hydraulic bottom plate open state of the energy-saving ore smelting furnace based on bubbling fluidization;

[0028] Figure 8 is a structural schematic diagram of the air-cooled cloth air distribution plate of the energy-saving ore smelting furnace based on bubbling fluidization according to the present application;

[0029] Figure 9 is a sectional view of the air-cooled cloth air distribution plate of the energy-saving ore smelting furnace based on bubbling fluidization according to the present application;

[0030] Figure 10 is a structural schematic diagram of the electromagnetic vibrating feeder of the energy-saving ore smelting furnace based on bubbling fluidization according to the present application;

[0031] Figure 11 is a sectional view of the furnace body of the second specific embodiment of the energy-saving ore smelting furnace based on bubbling fluidization according to the present application

[0032] Wherein: 1-fluidized preheating section; 2-ore smelting section; 21-insertion pipe; 3-hopper; 4-electromagnetic vibrating feeder; 41-feeder open end; 5-overflow pipe; 51-overflow pipe inlet; 6-exhaust port; 7-air-cooled cloth air distribution plate; 71-air pipe hole; 72-air cap inlet; 8-feeding pipe; 9-explosion-proof door; 10-manhole door; 11-liquid outlet valve; 12-hydraulic bottom plate; 121-semi-circular bottom plate; 122-hydraulic rod; 13-air cap; 14-air box; 141-air box inlet; 15-center pipe. DETAILED DESCRIPTION

[0033] The technical solutions of the present application will be described clearly and completely below in combination with the drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0034] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0035] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "linking" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium, or internal connection of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0036] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as there is no conflict between them.

[0037] Specific implementation method one: see Figures 1-10 Specific description of the present embodiment. The furnace body of the energy-saving ore smelting furnace based on bubbling fluidization in the present embodiment has a circular cross-section or a square cross-section, is made of refractory bricks inside, and has a steel structure on the outer surface; the furnace body specifically includes a fluidized preheating section 1, an ore smelting section 2, and a plurality of overflow pipes 5, the lower end of the fluidized preheating section 1 is connected with the ore smelting section 2; a feeding mechanism is arranged at the upper end of the fluidized preheating section 1; a wind-cooled cloth air distribution plate 7 is arranged in the fluidized preheating section 1, which separates the fluidized preheating section 1 and the ore smelting section 2; a wind box 14 is arranged outside the fluidized preheating section 1, the wind box 14 has an annular structure and is provided with a wind box inlet 141; the wind box 14 and the wind-cooled cloth air distribution plate 7 are communicated; a plurality of overflow pipes 5 are uniformly distributed on the circumference of the outside of the energy-saving ore smelting furnace, the upper end of the overflow pipe 5 is communicated with the fluidized preheating section 1, and the lower end is communicated with the ore smelting section 2; a plurality of burners are arranged on the ore smelting section 2, and a molten ore outlet valve 11 is arranged on the side of the ore smelting section 2 close to the bottom plate; a hydraulic bottom plate 12 is arranged at the bottom of the ore smelting section 2, which can be opened and closed by hydraulic control to complete the discharge and closing of the material.

[0038] The feeding mechanism includes a stock bin 3, an electromagnetic vibrating feeder 4, and a feeding pipe 8, the stock bin 3 is arranged on the fluidized preheating section 1 through a support, the lower end outlet of the stock bin 3 is opposite to the closed end of the electromagnetic vibrating feeder 4, the feeder opening end 41 of the electromagnetic vibrating feeder 4 is opposite to the inlet of the feeding pipe 8, the other end of the feeding pipe 8 is inserted into the inside of the fluidized preheating section 1, and the feeding pipe 8 is arranged at the center of the fluidized preheating section 1; the electromagnetic vibrating feeder 4 can be replaced by a screw conveyor.

[0039] A plurality of overflow ports are uniformly distributed on the circumference of the fluidized preheating section 1, and the overflow ports are communicated with the overflow pipe inlets 51 of the upper ends of the overflow pipes 5.

[0040] The ore melting section 2 is provided with a plurality of insertion tubes 21 distributed on the circumference, the lower end of the overflow pipe 5 is provided with a return valve and is communicated with the insertion tube 21; the insertion tube 21 is obliquely arranged on the ore melting section 2, the oblique direction is upward, and the included angle with the horizontal plane is 0°-45°; the burner is arranged on the insertion tube 21, the burner shares the inlet with the overflow pipe 5, the combustion jet of natural gas and air plays an ejecting role on the ore return material, is arranged along the circumference of the kiln, the overflow material is uniformly distributed, and the overflow material is uniformly distributed; the two functions of the return material and the accommodation of the burner are met through the insertion tube 21, two pipe joints are simultaneously opened on the sealing cover plate of each insertion tube 21, one can be used for inserting a thermocouple to monitor the temperature of the ore melting section, and the other is reserved.

[0041] The hydraulic bottom plate 12 includes two semicircular bottom plates 121 and two hydraulic rods 122, the two semicircular bottom plates 121 are symmetrically arranged at the bottom of the ore melting section 2 and are hinged with the ore melting section 2; one end of the hydraulic rod 122 is connected with the semicircular bottom plate 121, and the other end is connected with the ore melting section 2, the hydraulic rod 122 can be started to pull open the semicircular bottom plate 121 downward to discharge the material, when normally operating, the hydraulic rod 122 is stretched upward to tightly press the semicircular bottom plate 121 to a closed state. The material in the cavity can be discharged through the hydraulic bottom plate 12 in the event of an accident or shutdown.

[0042] The air-cooled cloth wind board 7 includes a steel plate, a plurality of air pipes and a plurality of air caps 13, the plurality of air pipes are arranged on the lower surface of the steel plate and are connected by welding to form a membrane type wall structure; the air pipe is provided with a plurality of air pipe holes 71; the steel plate is uniformly provided with a plurality of air cap inlets 72, the air cap inlet 72 is a through hole; the air cap 13 is arranged on the upper surface of the steel plate, the base of the air cap 13 is inserted into the air cap inlet 72 and is coaxially installed, the lower edge of the air cap 13 is free of gap when installed; the air cap 13 is one of a bell-shaped air cap, a mushroom-shaped air cap, an arrow-shaped air cap or a 7-shaped air cap and the like wear-resistant air cap; the hot flue gas from the ore melting section 2 enters the upper fluidized preheating section 1 after passing through the air cap 13, fluidizes the ore entering through the feeding pipe 8 and preheats the ore, and then is discharged to the atmosphere through the exhaust port 6. The cold air enters the air tank 14 through the air tank inlet 141, and at the same time freely flows into the air pipe of the air-cooled cloth wind board 7 and cools the air-cooled cloth wind board 7, and then enters the cavity of the ore melting section 2 through the air pipe holes 71 on the side of the ore melting section 2, on one hand, the air-cooled cloth wind board 7 flows and cools, on the other hand, an air film layer is formed below the air-cooled cloth wind board 7 to protect the air-cooled cloth wind board 7, and at the same time, the air film layer can also participate in the combustion of the burner below as combustion-supporting air.

[0043] The ore melting section 2 is provided with a circular explosion-proof door 9 and a square manhole door 10.

[0044] The upper end of the fluidized preheating section 1 is provided with an exhaust port 6, and the exhaust port 6 is offset to one side.

[0045] The ore used in the embodiment is mainly silicate ore, including basalt, andesite, basanite, diabase, gabbro, coarse-grained basalt, amphibolite, andesite porphyrite and other volcanic magma rocks, and the particle size of the ore is in the range of 0-20 mm. The composition of a typical such ore is shown in Table 1.

[0046] Table 1 Chemical composition of basalt ore

[0047] Chemical composition SiO2 Al2O3 Fe2O3, FeO TiO2 CaO MgO, MnO [K2O] Na2O Mass content % 45-74 4-21 5-16 2-5 5-21 5-15 1.5-4.5 3.5-12

[0048] The specific working process of the energy-saving ore smelting furnace based on bubbling fluidization according to the present application is as follows:

[0049] The basalt ore with the composition shown in Table 1 is crushed to less than 10 mm, and the fine ore is transported to the stock bin 3. The falling speed of the stock bin 3 is adjusted to 3-10 tons / hour, and the fine ore will fall into the electromagnetic vibrating feeder 4. When the weight of the ore exceeds the counterweight, the fine ore is continuously fed into the fluidized preheating section 1 of the furnace through the feeding pipe 8. Air is supplied to the air-cooled cloth air distribution plate 7, and the surface temperature of the air-cooled cloth air distribution plate 7 is controlled to be not more than 600℃. The control valves of the 8 natural gas burners on the side wall of the ore smelting section 2 are opened, and the opening degree of the natural gas valve and the air valve is adjusted so that the flow of natural gas is diffused and combusted at a flow rate of less than 110 m 3 / h. The hot flue gas generated will pass through the small holes in the 100-150 bell-shaped hoods 13 on the air-cooled cloth air distribution plate 7, enter the fluidized preheating section 1 at high speed, fluidize the fine ore, and complete the heat exchange process under strong mixing.

[0050] The hot flue gas cooled by heat exchange is discharged from the flue gas outlet 6 at the top of the furnace. The heated fine ore is fluidized in the fluidized preheating section 1, and as the fine ore is continuously added, the height of the bubbling bed gradually increases to a height exceeding the lower end of the overflow pipe 5. The heated fine ore will overflow through the 8 overflow pipes 5 to the ore smelting section 2 of the lower section. At this time, the speed should be controlled through the return valve at the lower end of the overflow pipe 5 to ensure a certain material height in the overflow pipe 5 to play the role of air seal to prevent hot flue gas short circuit. The hot ore entering the ore smelting section 2 will quickly reach a temperature of 1450-1650℃ under the direct blowing of the flames of the 8 natural gas burners, and the flow rate of natural gas is 110 m 3 / h at full load. The qualified basalt melt overflows from the liquid outlet valve 11 to the subsequent sieve plate and drawing machine to produce high-quality basalt fibers.

[0051] When the furnace is stopped, the ore feeding is stopped, the fuel pipe of the natural gas burner is closed, the air pipe is kept connected to gradually cool the furnace body, and the air-cooled cloth air distribution plate 7 is kept in the air-cooled state. When the furnace is cooled to not more than 500℃, the hydraulic bottom plate 12 is opened for discharging, and after complete cooling, the slag is removed.

[0052] Specific implementation method two: see Figure 11 Specific description of the embodiment. The fluidized preheating section 1 of the energy-saving ore smelting furnace based on bubbling fluidization in the embodiment is provided with a feeding mechanism at the upper end, the feeding mechanism comprises a stock bin 3, an electromagnetic vibrating feeder 4 and a feeding pipe 8, the stock bin 3 is arranged on the fluidized preheating section 1 through a support, the lower end outlet of the stock bin 3 is opposite to the closed end of the electromagnetic vibrating feeder 4, the feeder opening end 41 of the electromagnetic vibrating feeder 4 is opposite to the inlet of the feeding pipe 8, the other end of the feeding pipe 8 is inserted into the fluidized preheating section 1, and the feeding pipe 8 is arranged at the edge position of the top end of the fluidized preheating section 1. A central pipe 15 made of refractory material is preset from the top center of the fluidized preheating section 1 to the lower bottom surface of the air-cooled cloth wind board 7 and penetrates through the fluidized preheating section 1 and the air-cooled cloth wind board 7, and a large-capacity natural gas burner is arranged in the central pipe 15; an overflow pipe 5 is arranged at a position opposite to the feeding pipe 8 outside the fluidized preheating section 1; the upper end of the overflow pipe 5 is communicated with the fluidized preheating section 1, and the lower end is communicated with an insertion pipe 21 arranged obliquely on the ore smelting section 2; the preheated ore overflows through the overflow pipe 5 into the chamber of the lower ore smelting section 2. The other components and connection relationship of the embodiment are the same as those of the specific embodiment one, and other silicate ores with similar components in Table 1 are melted.

[0053] In summary of the above implementation cases, the energy-saving ore smelting furnace based on bubbling fluidization can recover the waste heat in the hot flue gas, reduce the exhaust gas temperature and save energy by the segmented design of the furnace body, the ore in the fluidized preheating section 1 is heated by the hot flue gas of the ore smelting section 2; the ore can be evenly dispersed in all directions by feeding through the feeding pipe 8 arranged on the top of the furnace, and the ore is uniformly heated under the action of the hot flue gas bubbling fluidization, so that the waste heat of the hot flue gas is maximally utilized; the preheated ore can be as evenly as possible scattered into the ore smelting liquid through the overflow pipes 5 arranged along the circumference of the furnace, so as to avoid accumulation and clumping, which is beneficial to rapid melting; the energy-saving ore smelting furnace based on bubbling fluidization can adapt to a wider range of rock feeding, as long as the ore meets the sealing and fluidization requirements to a certain extent, the furnace can be used for melting; the hydraulic bottom plate 12 at the bottom of the furnace can realize rapid slagging and cleaning, and the cleaning and inspection operation is convenient.

[0054] The above specific embodiments further illustrate the purpose, technical solutions and beneficial effects of the present application. It should be understood that the above description is only for specific embodiments of the present application and is not intended to limit the application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. An energy efficient ore smelting furnace based on bubbling fluidization characterized by: The energy-saving ore melting furnace comprises a fluidized preheating section (1), an ore melting section (2) and a plurality of overflow pipes (5); the fluidized preheating section (1) is provided with a feeding mechanism at the upper end, and is connected with the ore melting section (2) at the lower end; the fluidized preheating section (1) is provided with a wind-cooled cloth air distribution plate (7) inside; the wind-cooled cloth air distribution plate (7) separates the fluidized preheating section (1) and the ore melting section (2); the fluidized preheating section (1) is provided with a wind box (14) outside; the wind box (14) is communicated with the wind-cooled cloth air distribution plate (7); the energy-saving ore melting furnace is provided with a plurality of overflow pipes (5) which are uniformly distributed on the circumference outside; the upper end of the overflow pipe (5) is communicated with the fluidized preheating section (1), and the lower end is communicated with the ore melting section (2); the ore melting section (2) is provided with a liquid outlet valve (11) outside, and is provided with a hydraulic bottom plate (12) at the bottom for discharging materials; the energy-saving ore melting furnace based on bubbling fluidization is provided with a plurality of burners.

2. The bubble fluidized based energy efficient ore smelting furnace as claimed in claim 1, wherein: The feeding mechanism comprises a stock bin (3), an electromagnetic vibrating feeder (4) and a feeding pipe (8); the stock bin (3) is arranged on the fluidized preheating section (1) through a support; the lower end outlet of the stock bin (3) is opposite to the electromagnetic vibrating feeder (4); the feeder opening end (41) of the electromagnetic vibrating feeder (4) is opposite to the inlet of the feeding pipe (8); the other end of the feeding pipe (8) is inserted into the fluidized preheating section (1).

3. The energy efficient ore smelting furnace based on bubbling fluidization as claimed in claim 1 or 2, wherein: The fluidized preheating section (1) is provided with a plurality of overflow ports which are uniformly distributed on the circumference; the overflow ports are communicated with the overflow pipe inlets (51) of the upper ends of the overflow pipes (5).

4. The bubble fluidized based energy efficient ore smelting furnace as claimed in claim 3, wherein: The ore melting section (2) is provided with a plurality of insertion pipes (21) which are uniformly distributed on the circumference; the lower end of the overflow pipe (5) is communicated with the insertion pipe (21); the burner is arranged on the insertion pipe (21).

5. The bubble fluidized based energy efficient ore smelting furnace as claimed in claim 4, wherein: The insertion pipe (21) is arranged on the ore melting section (2) in an inclined manner; the inclination direction is upward, and the included angle with the horizontal plane is 0°-45°.

6. The bubble fluidized based energy efficient ore smelting furnace as claimed in claim 4, wherein: The lower end of the overflow pipe (5) is provided with a return valve.

7. The bubble fluidized based energy efficient ore smelting furnace as claimed in claim 1 wherein: The hydraulic bottom plate (12) comprises two semicircular bottom plates (121) and two hydraulic rods (122); the two semicircular bottom plates (121) are symmetrically arranged on the bottom of the ore melting section (2) and are hinged with the ore melting section (2); one end of the hydraulic rod (122) is connected with the semicircular bottom plate (121), and the other end is connected with the ore melting section (2).

8. The bubble fluidized based energy efficient ore smelting furnace as claimed in claim 1 wherein: The wind-cooled cloth air distribution plate (7) comprises a steel plate, a plurality of air pipes and a plurality of air caps (13); the plurality of air pipes are arranged on the lower surface of the steel plate; the air pipes are provided with a plurality of air pipe holes (71); the steel plate is uniformly provided with a plurality of air cap inlets (72); the air cap (13) is arranged on the upper surface of the steel plate and is communicated with the air cap inlet (72).

9. The bubble fluidized based energy efficient ore smelting furnace as claimed in claim 1 wherein: The upper end of the fluidized preheating section (1) is provided with a smoke outlet (6); the ore melting section (2) is provided with an explosion-proof door (9) and a manhole door (10).

10. The bubble fluidized based energy efficient ore smelting furnace as claimed in claim 1, wherein: The fluidized preheating section (1) is provided with a central pipe (15) inside; the upper end of the central pipe (15) is connected with the top of the fluidized preheating section (1), and the lower end penetrates through the wind-cooled cloth air distribution plate (7) and extends into the ore melting section (2); the central pipe (15) is provided with a burner inside.

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