WO2017024535A1

WO2017024535A1 - Melting separation furnace and method for treating material to be melted and separated with same

Info

Publication number: WO2017024535A1
Application number: PCT/CN2015/086683
Authority: WO
Inventors: 吴道洪; 谢善清; 刘行波; 裴芬; 王东方; 林景龙
Original assignee: 北京神雾环境能源科技集团股份有限公司
Priority date: 2015-08-11
Filing date: 2015-08-11
Publication date: 2017-02-16

Abstract

Provided are a melting separation furnace and a method for treating a material to be melted and separated with the melting separation furnace. The melting separation furnace comprises a melting separation furnace body (100), which has a melting separation space (10) inside, wherein the bottom of the melting separation space (10) defines a melting pool (11), a feeding zone (12), a melting zone (13), a separation zone (14) and a discharge zone (15) are formed successively in the melting separation space (10) along a melt flow direction, the feeding zone (12) is located at one end of the melting separation furnace body (100), the discharge zone (15) is located at the other end of the melting separation furnace body (100), a feeding port (101) is provided on a side wall of the feeding zone (12), and a discharge port (102) and a slag exit (103) are provided on a side wall of the discharge zone (15); and first regenerative burners (200), wherein at least one pair of first regenerative burners (200) are provided correspondingly at the melting zone (13), each pair of first regenerative burners (200) are arranged on the opposite side walls of the melting separation furnace body (100), and each first regenerative burner (200) comprises a nozzle (22), a fuel gas slag chamber (23), an air slag chamber (24), and a fuel gas regenerative chamber (25) and an air regenerative chamber (26); and second regenerative burners (300), wherein at least one pair of second regenerative burners (300) are provided correspondingly at the separation zone (14), and each pair of second regenerative burners (300) are arranged on the opposite side walls of the melting separation furnace body (100).

Description

Melting furnace and method for treating material to be melted by using the same

Technical field

The present invention relates to a melting furnace and a method of treating a material to be melted using the melting furnace.

Background technique

At present, the separation of slag iron is usually carried out by using a blast furnace. The blast furnace is an upright furnace type, which requires coke as a material rack to keep the air passage in the furnace unobstructed, and the reduced iron generated in the upper reduction zone is melted into a liquid by the heat energy generated by the combustion of the coke. Dropping into the hearth, the slag and the molten metal are separated in the hearth, and after accumulating to a certain amount, they are discharged from the slag iron port to obtain molten metal and slag. However, this technology requires the use of coke as a fuel and material column, and the coking process process will cause serious environmental pollution, and the strength of the incoming material is high, such as the low strength of the pellet, which will cause the column to be ventilated during the lowering process. Poor sex, affecting the blast furnace forward and gas chemical energy, and the equipment is poorly controllable, and it is closed smelting, from the raw material into the furnace to the metal melt out, the reaction time is longer, can not be processed continuously, and the second raw material adaptation Poor, only suitable for the smelting of high-grade iron concentrate, can not be used for the most difficult reserves, vanadium-titanium ore, composite ore, etc. In addition, the equipment has high energy consumption, low energy utilization efficiency, and exhaust temperature in the furnace. High, energy conversion is required in the form of waste heat boilers and power generation, and the conversion efficiency is ≤ 30%.

Summary of the invention

The present invention aims to solve at least one of the technical problems in the related art to some extent. Accordingly, it is an object of the present invention to provide a melting furnace and a method for treating a material to be melted by using the melting furnace, which can realize continuous processing of a material to be melted and heat storage in a regenerator The body is not easy to block.

In one aspect of the invention, the invention provides a melting furnace, according to an embodiment of the invention, the melting furnace comprises:

a melting furnace body, the melting furnace body has a melting space, the bottom of the melting space defines a molten pool, and the melting space sequentially forms a feeding zone, a melting zone, and a separation zone along the melt flow direction And a discharge area, a feeding port is arranged on a side wall of the feeding zone, and a discharge port and a slag opening are arranged on a side wall of the discharging zone;

a first regenerative burner, wherein the melting zone is correspondingly provided with at least one pair of the first regenerative burners, each pair of the first regenerative burners being disposed on opposite sides of the melting furnace body Each of the first regenerative burners includes a nozzle, a gas deposition chamber, an air deposition chamber, a gas regenerator in communication with the gas deposition chamber, and an air regenerator in communication with the air deposition chamber; as well as

a second regenerative burner, wherein the separation zone is correspondingly provided with at least one pair of the second regenerative burners, each pair of said A second regenerative burner is disposed on opposite sidewalls of the melting furnace body.

Therefore, the melting furnace according to the embodiment of the present invention can realize continuous processing of the material to be melted, and the heat storage body of the regenerator burner is not easily blocked, and the metal melt and the slag are separated efficiently and the energy consumption is relatively high. low.

Further, the melting furnace according to the above embodiment of the present invention may have the following additional technical features:

In some embodiments of the present invention, the gas regenerator and the gas sludge chamber are in communication with the nozzle through a first air flow passage, and the air regenerator and the air sediment chamber pass through a second air flow passage The nozzle is in communication. When the first regenerative burner is in a smoke exhausting state, the air sediment chamber is located upstream of the air regenerator in a flow direction of the flue gas, and the gas dump chamber is located The gas regenerator is upstream of the gas storage chamber. Thereby, clogging of the heat storage body can be effectively reduced.

In some embodiments of the invention, the flow area of the first air flow passage gradually increases in a direction from the nozzle to the gas deposition chamber, in a direction from the nozzle to the air sediment chamber The flow area of the second air flow passage is gradually increased. Specifically, the transition section of the first airflow passage to the gas deposition chamber suddenly increases, and the transition section of the second airflow passage to the air sedimentation chamber abruptly increases. Thereby, the dust in the flue gas can be removed, thereby further reducing the clogging of the regenerator.

In some embodiments of the present invention, the gas regenerator and the air regenerator have respectively a regenerator stacked with lattice bricks, wherein the lattice brick has a pore size of 10 to 100 mm. Thereby, the clogging of the heat storage body checker brick is further reduced while significantly increasing the heat storage effect of the heat storage body.

In some embodiments of the present invention, the melting furnace body at the molten pool is stacked from a plurality of layers of erosion resistant refractory bricks, and a steel furnace shell is disposed around the refractory bricks at the molten pool. And a cooling device is disposed between the refractory brick located at the molten pool and the steel furnace shell, wherein a cooling wall is disposed between the refractory brick located at the sidewall of the molten pool and the steel furnace shell A water-cooled tube or an air-cooled tube is disposed between the refractory brick located at the bottom of the molten pool and the steel furnace shell. Thereby, the life of the melting furnace can be further improved.

In some embodiments of the present invention, the front end wall, the rear end wall, the side wall, and the top of the portion of the melting furnace body located at an upper portion of the molten pool are independently made of gas-resistant, high-temperature resistant, and Insulation refractory bricks are piled up. Thereby, the life of the melting furnace can be further improved.

In some embodiments of the invention, the front end wall of the portion of the melting furnace body located at the upper portion of the molten pool is a curved end wall. Thereby, the sealing of the feed opening can be achieved.

In some embodiments of the invention, the melting furnace further includes: a silo; and a charging device coupled to the silo and the feed port, respectively.

In a second aspect of the invention, the invention provides a method of treating a material to be melted using the melting furnace described above, according to an embodiment of the invention, the method comprising:

And alternately supplying combustion materials to each of the pair of the first regenerative burner and the second regenerative burner, respectively Heating the melting space, wherein the combustion material comprises gas and air;

Feeding the material to be melted from the feed port into the melting space, so that the material to be melted is sequentially melted through the feed zone, the melting zone, the separation zone, and the discharge zone. The separation treatment is performed to obtain a molten metal and slag, and the molten metal is discharged from the discharge port, and the slag is discharged from the slag discharge port.

Thus, the method for treating a material to be melted according to an embodiment of the present invention can achieve continuous processing of the material to be melted by using the above-mentioned melting furnace to treat the material to be melted, and the heat storage body of the regenerator burner is not easy. Blockage, while molten metal and slag separation efficiency is higher and energy consumption is lower.

In addition, the method of processing a material to be melted according to the above embodiment of the present invention may further have the following additional technical features:

In some embodiments of the invention, the temperature of the melting zone is between 1000 and 1800 degrees Celsius, and the temperature of the separation zone is between 100 and 200 degrees Celsius lower than the temperature of the melting zone. Thereby, the separation efficiency of the molten metal and the slag can be further improved.

The additional aspects and advantages of the invention will be set forth in part in the description which follows.

DRAWINGS

The above and/or additional aspects and advantages of the present invention will become apparent and readily understood from

1 is a top plan view of a melting furnace in accordance with one embodiment of the present invention;

Figure 2 is a front structural view showing a melting furnace according to still another embodiment of the present invention;

Figure 3 is a front elevational view showing a melting furnace according to still another embodiment of the present invention;

Fig. 4 is a front structural view showing a melting furnace according to still another embodiment of the present invention.

Detailed description of the invention

The embodiments of the present invention are described in detail below, and the examples of the embodiments are illustrated in the drawings, wherein the same or similar reference numerals are used to refer to the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the drawings are intended to be illustrative of the invention and are not to be construed as limiting.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " Rear, Left, Right, Vertical, Horizontal, Top, Bottom, Inner, Out, Clockwise, Counterclockwise, Axial The orientation or positional relationship of the "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is merely for the convenience of describing the present invention and simplifying the description, and does not indicate or imply the indicated device or The elements must have a particular orientation, are constructed and operated in a particular orientation and are therefore not to be construed as limiting.

Moreover, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or Implicitly indicates the number of technical features indicated. Thus, features defining "first" or "second" may include at least one of the features, either explicitly or implicitly. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless specifically defined otherwise.

In the present invention, the terms "installation", "connected", "connected", "fixed" and the like shall be understood broadly, and may be either a fixed connection or a detachable connection, unless explicitly stated and defined otherwise. , or integrated; can be mechanical or electrical connection; can be directly connected, or indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction of two elements, unless otherwise specified Limited. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood on a case-by-case basis.

In the present invention, the first feature "on" or "under" the second feature may be a direct contact of the first and second features, or the first and second features may be indirectly through an intermediate medium, unless otherwise explicitly stated and defined. contact. Moreover, the first feature "above", "above" and "above" the second feature may be that the first feature is directly above or above the second feature, or merely that the first feature level is higher than the second feature. The first feature "below", "below" and "below" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely that the first feature level is less than the second feature.

In one aspect of the invention, the invention provides a melting furnace. According to an embodiment of the invention, the melting furnace comprises: a melting furnace body, the melting furnace body has a melting space, the melting space bottom defines a molten pool, the melting space along the melt The flow direction sequentially forms a feed zone, a melting zone, a separation zone and a discharge zone, the feed zone being located at one end of the melting furnace body, the discharge zone being located at the other end of the melting furnace body, a feeding port is arranged on a side wall of the feeding zone, a discharging port and a slag opening are arranged on a side wall of the discharging zone; and a first regenerative burner, the melting zone is correspondingly provided with at least one pair The first regenerative burner, each pair of the first regenerative burners is disposed on opposite sidewalls of the melting furnace body, and each of the first regenerative burners includes a nozzle and a gas a sediment chamber, an air sediment chamber, a gas regenerator connected to the gas sediment chamber, and an air regenerator in communication with the air sediment chamber; and a second regenerative burner, wherein the separation region is correspondingly provided with at least one For the second regenerative burner, each pair of the second regenerative burners is disposed in the melting On opposite sidewalls of the furnace body. The inventors have found that by providing a regenerative burner on the body of the melting furnace to heat the melting space, the material to be melted can be heated and melted while sequentially passing through various regions in the melting space, and the separation region is set. The metal melt and the slag can be completely separated. When the molten metal and the slag are collected in the molten pool to a certain amount, they can be discharged from the discharge port and the slag outlet respectively, so that the melting furnace can be melted. Continuous processing of materials, and the use of a regenerative burner to heat the melting space, can achieve precise temperature control of the melting space and uniform temperature field distribution in the melting space, which can significantly improve the material to be melted Melting efficiency, and by providing a regenerative burner having a gas-sink chamber and an air-sink chamber on the side wall of the melting zone, the dust and semi-molten slag entrained in the high-temperature flue gas are sedimented during the exhausting process The chamber is separated, and the flue gas after the sediment enters the regenerator for heat storage, thereby effectively reducing the blockage of the regenerator in the regenerator, reducing the maintenance cost, and further improving the heat. Rate, and by using the first regenerative burner and the second regenerative burner, so that the effective use of regenerative burner The regenerator recovers the waste heat from the high-temperature flue gas, and fully utilizes the part of the residual heat to preheat the combustion materials (gas and air), thereby reducing the energy cost per unit product, and the flue gas obtained by the regenerative burner is low temperature. Secondly, the melting furnace of the present invention has lower material strength and particle size requirements for the molten material, and the present invention does not cause serious environmental pollution as compared with the use of coke as a fuel and a column, and the present invention can be applied to low Melting treatment of grade ore, refractory ore and composite ore.

The melting furnace of the embodiment of the present invention will be described in detail below with reference to Figs. According to an embodiment of the invention, the melting furnace comprises:

Melting furnace body 100: According to an embodiment of the invention, the melting furnace body 100 has a melting space 10 therein, the bottom of the melting space 10 defines a molten pool 11, and the melting space 10 sequentially forms a feed along the melt flow direction. The zone 12, the melting zone 13, the separation zone 14 and the discharge zone 15, the feed zone 12 is located at one end of the melting furnace body 100, and the discharge zone 15 is located at the other end of the melting furnace body 100, the side wall of the feed zone 12 A feed port 101 is provided, and a discharge port 102 and a tap hole 103 are provided on the side wall of the discharge zone 15, and the tap hole 103 is located above the discharge port 102 in the height direction. According to a specific embodiment of the present invention, the molten pool 11 may have a rectangular shallow pool structure. Thereby, the material to be melted can be spread in a thin layer horizontally in the molten pool, so that the melting efficiency of the material can be significantly improved.

According to an embodiment of the present invention, the melting furnace body 100 at the molten pool 11 may be stacked from a plurality of layers of erosion resistant refractory bricks, for example, the refractory bricks may be carbon composite bricks, microporous corundum bricks, and semi-graphite carbon bricks. . Thereby, the erosion resistance of the molten pool can be significantly improved, thereby avoiding the damage of the melt to the molten pool, thereby improving the service life of the melting furnace.

According to still another embodiment of the present invention, the periphery of the refractory brick at the molten pool 11 may be provided with a steel furnace shell 16. Thereby, the stability of the furnace body can be effectively maintained. According to still another embodiment of the present invention, a cooling device 17 may be disposed between the refractory brick located at the molten pool 11 and the steel furnace shell 16. Thus, by providing a cooling device between the molten pool refractory brick and the steel furnace shell, the high temperature resistance of the refractory brick can be significantly improved, thereby further improving the service life of the melting furnace. According to a specific embodiment of the present invention, a cooling wall may be disposed between the refractory brick located at the sidewall of the molten pool 11 and the steel furnace shell 16. The material of the cooling wall may be selected by a person skilled in the art according to actual needs, for example, Cast steel, cast iron or copper stave. According to another embodiment of the present invention, a water-cooled tube or an air-cooled tube may be disposed between the refractory brick located at the bottom of the molten pool 11 and the steel furnace shell 16. Thereby, the service life of the melting furnace can be further improved.

According to still another embodiment of the present invention, the front end wall 18, the rear end wall 19, the side wall 20, and the furnace roof 21 of the portion of the melting furnace body 100 located at the upper portion of the molten pool 11 may be independently gas-resistant, The refractory bricks with high temperature resistance and thermal insulation properties are stacked, for example, refractory bricks such as magnesia-alumina spinel brick, mullite heat-insulating brick, high-purity mullite turn, and fused half-recombined magnesia chrome brick. Thereby, the service life of the melting furnace can be further improved. According to a specific embodiment of the present invention, the front end wall 18 of the portion of the melting furnace body 100 located at the upper portion of the molten pool 11 may be a curved end wall. Thereby, it is possible to seal the feed port.

According to still another embodiment of the present invention, the feed port 101 may be disposed on the wall of the molten pool at the lower end of the front wall, the discharge port The 102 and the slag opening 103 may be located on the wall of the sump at the lower end of the rear end wall. Specifically, the discharge port and the slag outlet can be blocked by the mud. When the molten metal and the slag in the discharge zone of the molten pool are collected to a certain amount, the discharger is used to drill through the discharge port of the mud mud and After the discharge is completed, the discharge port and the slag outlet are blocked by the gun mud, and the obtained metal melt is sent to the cast iron workshop for casting or sent to the steelmaking workshop for steel making, and the slag can be used for the production of cement and other buildings. material.

First regenerative burner 200: according to an embodiment of the invention, comprising a plurality of first regenerative burners, each of which is disposed on a side wall of the melting furnace body 100, and The melting zone 13 is correspondingly provided with at least one pair of first regenerative burners, each pair of first regenerative burners being disposed on opposite side walls of the melting furnace body 100, ie, a plurality of first regenerative burners along the The melt flow direction is disposed on the side wall of the melting furnace body, and each pair of regenerative burners are disposed opposite to each other on the side wall. According to an embodiment of the invention, each first regenerative burner 200 comprises a nozzle 22, a gas sludge chamber 23, an air sediment chamber 24, a gas regenerator 25 and an air regenerator 26, in accordance with an embodiment of the invention. For example, the gas-sink chamber 23 is in communication with the gas regenerator 25, the air-sink chamber 24 is in communication with the air regenerator chamber 26, and the gas regenerator chamber 25 and the gas-sink chamber 23 are in communication with the nozzle 22 through the first airflow passage 27, The air regenerator 26 and the air sedimentation chamber 24 communicate with the nozzle 22 through the second air flow passage 28, and when the first regenerative burner is in the exhausting state, the air sediment chamber 24 is located in the air storage direction in the flow direction of the flue gas. Upstream of the hot chamber 26, the gas sludge chamber 23 is located upstream of the gas regenerator 25. The inventors have found that by providing a first regenerative burner having a gas-sink chamber and an air-sink chamber on the side wall of the melting zone, the dust and semi-molten slag entrained in the high-temperature flue gas are discharged during the exhausting process. The sediment chamber is separated, and the flue gas after the sediment enters the regenerator for heat storage, thereby effectively reducing the blockage of the heat storage body in the regenerator, reducing the maintenance cost, and thereby improving the thermal efficiency.

According to still another embodiment of the present invention, the gas regenerator and the air regenerator are cavities constructed of refractory materials, and the gas regenerator and the air regenerator have heat storage stacked by checkered bricks, respectively. body. According to still another embodiment of the present invention, the aperture of the checker brick is not particularly limited, and those skilled in the art can select according to actual needs. According to a specific embodiment of the present invention, the lattice of the checker brick may have a diameter of 10 to 100 mm. The inventors have found that if the aperture of the lattice brick is too large, the heat storage effect of the heat storage body is not good, and if the aperture diameter of the lattice brick is too low, the clogging of the heat storage body lattice brick is likely to occur. Thus, by selecting a checker brick having a hole diameter of 10 to 100 mm, it is possible to reduce the clogging of the heat storage body while ensuring that the heat storage body has a high heat storage effect.

According to still another embodiment of the present invention, the gas regenerator can be divided into a first high temperature regenerator zone and a first low temperature regenerator zone from top to bottom, and the air regenerator can be divided into a second high temperature heat storage from top to bottom. The zone and the second low temperature heat storage zone have different materials of the first heat storage zone and the first low temperature heat storage zone, and the materials of the second high temperature heat storage zone and the second low temperature heat storage zone are different. Specifically, the temperature of the first high temperature heat storage zone and the second high temperature heat storage zone may be 1000 to 1600 ° C, and the temperature of the first low temperature heat storage zone and the second low temperature heat storage zone may be 100 to 1000 ° C.

According to still another embodiment of the present invention, the air sediment chamber and the gas sludge chamber may each be a cavity structure constructed of refractory bricks, and the lower portion of the cavity structure has a hammer structure. Thereby, it can be used to collect dust particles in the flue gas, and After the melting furnace is operated for a period of time, the air sludge chamber and the lower end of the gas sludge chamber are respectively opened to discharge the dust out of the gas sediment chamber and the air sediment chamber.

According to still another embodiment of the present invention, the gas deposition chamber may be disposed adjacent to the melting furnace body, and a partition wall made of refractory brick is disposed between the gas deposition chamber and the gas regenerator chamber, and the partition wall has an opening so that The flue gas after the sediment in the gas sediment chamber enters the gas regenerator for heat storage, the air sediment chamber is disposed away from the melting furnace body, and the partition wall made of refractory brick is arranged between the air sediment chamber and the air regenerator The upper portion also has an opening for allowing the flue gas discharged from the air sediment chamber to enter the air regenerative type for heat storage. Specifically, the plurality of first regenerative burners may be commutated in a concentrated manner, or may be dispersed and commutated.

For example, in the process of treating the molten material, the air inlet and the gas inlet of one of the pair of first regenerative burners are separately supplied with gas and air to be heated into the melting space, and the melting space is The generated high-temperature flue gas enters the gas sediment chamber through the first air flow passage of the other first regenerative burner, enters the air sediment chamber through the second gas flow passage, and the high-temperature flue gas separates the gas sediment chamber and the air sediment chamber The entrained dust and the semi-molten slag are separated, and the separated flue gas is discharged after being stored in the gas regenerator and the air regenerator, respectively. When the regenerator is stored to a certain extent, the first one is cut off. The regenerative burner supplies gas and air, and the low temperature flue gas is used to purify the gas regenerator, and the other regenerative burner is supplied with gas and air, so that the gas and air make full use of the regenerator The heat storage is preheated, and the generated high temperature flue gas is discharged after being stored by the first first regenerative burner, and the two first regenerative burners are alternately used.

According to still another embodiment of the present invention, the flow area of the first gas passage gradually increases in a direction from the nozzle to the gas deposition chamber, and the flow area of the second gas passage gradually increases in a direction from the nozzle to the air sediment chamber. Increase. Specifically, the transition section of the first airflow passage to the gas deposition chamber suddenly increases, and the transition section of the second airflow passage to the air sedimentation chamber abruptly increases. The inventors have found that a sudden increase in the flow section of the high-speed airflow causes a decrease in the airflow speed, and after the high-speed airflow speed is lowered, dust in the airflow, especially some large particulate dust, is separated from the airflow. Thus, by the arrangement of the invention, the dust and semi-molten slag in the flue gas can naturally fall into the gas sludge chamber and the air sediment chamber, and the flue gas after passing through the sediment chamber passes through the gas regenerator and the air. The regenerator stores heat in the regenerator of the regenerator, and discharges it from the lower duct of the regenerator, and the exhaust gas temperature is controlled below 300 °C.

Second regenerative burner 300: according to an embodiment of the invention, comprising a plurality of second regenerative burners, each of which is disposed on a side wall of the melting furnace body 100, and At least one pair of second regenerative burners are disposed correspondingly in the separation zone 14, and each pair of second regenerative burners is disposed on opposite sidewalls of the melting furnace body 100, ie, a plurality of second regenerative burners The melt flow direction is disposed on the side wall of the melting furnace body, and each pair of second regenerative burners are disposed opposite to each other on the side wall.

According to an embodiment of the invention, the second regenerative burner may be composed of a gas regenerator, an air regenerator and a nozzle, and the air regenerator and the gas regenerator are composed of two adjacent brick masonry spaces. , top masonry vault, side wall Refractory brick masonry, the outside is a fixed steel structure composed of steel and steel plates, wherein the plurality of second regenerative burners can be commutated in a concentrated manner or dispersed.

According to still another embodiment of the present invention, before the exhaust state of the first regenerative burner and the second regenerative burner is turned on, the supply of gas and air is first cut off, and then the gas regenerator is performed using the low-temperature flue gas. Backflushing causes the gas remaining in the gas regenerator to be blown into the melting space for combustion, thereby improving fuel utilization and preventing explosion of high-temperature flue gas mixed with residual gas when exhausting smoke.

According to still another embodiment of the present invention, by providing the first regenerative burner in the melting zone such that the temperature of the melting zone is 1000 to 1800 degrees Celsius, the temperature ratio of the separation zone is set by providing the second regenerative burner in the separation zone. The temperature of the melting zone is lowered by 100 to 200 degrees Celsius. Preferably, the first regenerative burner is disposed in the melting zone so that the temperature of the melting zone is 1450 to 1700 degrees Celsius, and the second regenerative burner is disposed in the separation zone to separate The temperature of the zone is 100 to 200 degrees Celsius lower than the temperature of the melt zone. Thereby, the separation efficiency of the molten metal and the slag can be further improved.

According to still another embodiment of the present invention, the alternate time for alternately supplying the combustion materials in each of the pair of first regenerative burners and the second regenerative burner is from 1 to 20 minutes. Thereby, the heat supply efficiency of the regenerative burner can be remarkably improved.

Specifically, the temperature of the flue gas discharged through the first regenerative burner and the second regenerative burner is controlled below 300 ° C, and the temperature of the gas after preheating through the gas regenerator is 1000 ° C or higher, and the air is stored in heat. The air temperature after preheating of the chamber is 1200 ° C or higher.

The melting furnace according to the embodiment of the present invention heats the melting space by providing a regenerative burner on the melting furnace body, so that the material to be melted is heated and melted while sequentially passing through various regions in the melting space, and The separation of the metal melt and the slag can be achieved by setting the separation zone. When the molten metal and the slag are collected in the molten pool to a certain amount, they can be discharged from the discharge port and the slag outlet respectively, so that the molten furnace can be The continuous treatment of the material to be melted is realized, and at the same time, since the refining burner is used to heat the melting space, precise temperature control of the melting space can be realized and the temperature field distribution in the melting space is uniform, thereby significantly improving the waiting The melting efficiency of the molten material, and by providing a regenerative burner having a gas-sinking chamber and an air-sinking chamber on the side wall of the melting zone, so that the dust and the half entrained in the high-temperature flue gas during the exhausting process The molten slag is separated through the sediment chamber, and the flue gas after the sediment enters the regenerator for heat storage, thereby effectively reducing the blockage of the regenerator in the regenerator and reducing the maintenance cost. Further, the thermal efficiency is improved, and by using the first regenerative burner and the second regenerative burner, the regenerator in the regenerative burner can be effectively utilized to recover waste heat from the high-temperature flue gas, and the part of the waste heat is fully utilized. Preheating the combustion materials (gas and air), thereby reducing the energy cost per unit product, and the flue gas obtained by the regenerative burner is low temperature, and secondly, the material strength and particle size of the melting furnace to be melted in the present invention The requirements are low, and the present invention does not cause serious environmental pollution as compared with the use of coke as a fuel and a column, and the present invention can be applied to a melting treatment of low-grade ore, refractory ore and composite ore.

Referring to FIG. 4, a melting furnace according to an embodiment of the present invention further includes:

Silo 400: According to an embodiment of the invention, the silo 400 is adapted to store material to be melted.

Feeding device 500: According to an embodiment of the invention, the charging device 500 is connected to the silo 400 and the feed port 101, respectively, and is adapted to supply the material to be melted into the melting space. Specifically, the material to be melted is sent from the heat conveyor to the high level silo above the feed port, and then discharged into the feeding device (feeder) by the high level silo, and the feeding device continuously performs mechanical reciprocating motion, thereby waiting The molten material is continuously and uniformly supplied into the melting furnace to achieve continuous uniform feeding.

In another aspect of the invention, the invention provides a method of treating a material to be melted. According to an embodiment of the invention, the method is carried out using the above-described melting furnace. According to a specific embodiment of the present invention, the method includes: alternately supplying combustion materials to each of the pair of the first regenerative burner and the second regenerative burner to respectively heat the melting space Wherein the combustion material comprises gas and air; and the material to be melted is supplied from the feed port at one end of the melting furnace body into the melting space to cause the to-be-melted The material is sequentially subjected to melting and separation treatment through the feed zone, the melting zone, the separation zone and the discharge zone, thereby obtaining a molten metal and molten slag, and the molten metal is taken from the other end of the melting furnace body The discharge port is discharged, and the slag is discharged from the tap hole. Therefore, by using the above-mentioned melting furnace to treat the molten material, continuous processing of the material to be melted can be realized, and the heat storage body of the regenerator burner is not easily blocked, and the technical melt and slag separation efficiency is high. And the energy consumption is low. It should be noted that the above described features and advantages for the melting furnace are also applicable to the method for processing the material to be melted, and details are not described herein again.

According to an embodiment of the invention, the alternate time for alternately supplying the combustion materials in each of the first regenerative burner and the second regenerative burner is from 1 to 20 minutes. Thereby, the heat supply efficiency of the regenerative burner can be remarkably improved.

The invention is described below with reference to the specific embodiments, which are intended to be illustrative, and not to limit the invention in any way.

Example

The direct reduced iron (DRI) produced by the direct reduction device is sent from the heat conveyor to the high level silo above the feed port, and then discharged into the feeding device (feeder) from the high level silo, and the feeding device continuously performs mechanical reciprocating Movement, thereby continuously supplying the direct reduced iron into the melting furnace through the feed port, and the DRI is heated and melted into a melt in the molten pool by the flame sprayed by the first regenerative burner and the second regenerative burner And slowly flowing in the molten pool, as the temperature gradually increases, after reaching the melting temperature, due to the different specific gravity of molten iron and slag, the iron and slag in the molten metal will naturally form stratification, forming molten iron and The molten slag, molten iron and slag are collected in a molten pool in the discharge area to a certain amount, respectively, from the discharge port, The slag outlet is discharged. The high-temperature flue gas generated by the melting zone and the separation zone enters one of each pair of the first regenerative burner and the second regenerative burner, enters the gas-sink chamber through the first airflow passage, and passes through the second airflow passage. After entering the air sediment chamber, after the gas sediment chamber and the air sediment chamber are respectively sedimented, the entrained dust and the semi-molten slag are separated (the second regenerative burner flue gas directly enters the fuel regenerator and the air storage through the airflow passage) The hot chamber), after the separated flue gas, the heat storage body of the gas regenerator (the lattice hole is 40 mm) and the air regenerator (the aperture of the lattice brick is 40 mm) are stored to a certain extent and discharged, after the commutation, The normal temperature gas and air are supplied to one burner of each pair of the first regenerative burner and the second regenerator burner, and the gas is preheated by the gas regenerator and the temperature is above 1000 ° C, and the air is passed through the air. After the preheating chamber is preheated, the temperature reaches 1200 ° C or higher, and the preheated gas and air are mixed and then sprayed through the nozzle to supply heat to the melting space, and each pair of the first regenerative burner and the second regenerative burner are Between fuel supply state and smoke exhaust state Alternate use, alternating time is 5 minutes. Before each pair of the first regenerative burner and the second regenerative burner are switched from the fuel supply state to the exhaust state, the fuel supply is first cut off, and the low temperature flue gas is introduced to backflush the fuel regenerator, leaving the residue After the fuel is blown into the melting space, the flue gas is discharged.

In the description of the present specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like means a specific feature described in connection with the embodiment or example. A structure, material or feature is included in at least one embodiment or example of the invention. In the present specification, the schematic representation of the above terms is not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, various embodiments or examples described in the specification, as well as features of various embodiments or examples, may be combined and combined.

Although the embodiments of the present invention have been shown and described, it is understood that the above-described embodiments are illustrative and are not to be construed as limiting the scope of the invention. The embodiments are subject to variations, modifications, substitutions and variations.

Claims

A melting furnace, characterized in that it comprises:

a melting furnace body, the melting furnace body has a melting space, the bottom of the melting space defines a molten pool, and the melting space sequentially forms a feeding zone, a melting zone, and a separation zone along the melt flow direction And a discharge area, a feeding port is arranged on a side wall of the feeding zone, and a discharge port and a slag opening are arranged on a side wall of the discharging zone;

a first regenerative burner, wherein the melting zone is correspondingly provided with at least one pair of the first regenerative burners, each pair of the first regenerative burners being disposed on opposite sides of the melting furnace body Each of the first regenerative burners includes a nozzle, a gas deposition chamber, an air deposition chamber, a gas regenerator in communication with the gas deposition chamber, and an air regenerator in communication with the air deposition chamber; as well as

a second regenerative burner, wherein the separation zone is correspondingly provided with at least one pair of the second regenerative burners, each pair of the second regenerative burners being disposed on opposite sides of the melting furnace body on.
A melting furnace according to claim 1, wherein said gas regenerator and said gas deposition chamber communicate with said nozzle through a first air flow passage, said air regenerator and said air sediment chamber Communicating with the nozzle through the second air flow passage, when the first regenerative burner is in a smoke exhausting state, the air sediment chamber is located upstream of the air regenerator in a flow direction of the flue gas, The gas sludge chamber is located upstream of the gas regenerator.
The melting furnace according to claim 2, wherein a flow area of said first air flow passage gradually increases in a direction from said nozzle to said gas deposition chamber,

The flow area of the second air flow passage gradually increases in a direction from the nozzle to the air sediment chamber.
The melting furnace according to claim 1, wherein the gas regenerator and the air regenerator have a regenerator stacked with lattice bricks, wherein the lattice brick has a pore diameter of 10 ～. 100 mm.
The melting furnace according to claim 1, wherein said melting furnace body at said molten pool is stacked from a plurality of layers of erosion resistant refractory bricks, and said refractory brick periphery of said molten pool is disposed a steel furnace shell, and a cooling device is disposed between the refractory brick located at the molten pool and the steel furnace shell,

Wherein, a cooling wall is disposed between the refractory brick located at the sidewall of the molten pool and the steel furnace shell, and a water cooling pipe is disposed between the refractory brick located at the bottom of the molten pool and the steel furnace shell or Air-cooled tube.
The melting furnace according to claim 5, wherein the front wall, the rear wall, the side wall and the furnace top of the portion of the melting furnace body located at an upper portion of the molten pool are independently resistant Gas scouring, high temperature and thermal insulation refractory bricks are piled up.
The melting furnace according to claim 6, wherein a front end wall of a portion of the melting furnace body located at an upper portion of the molten pool is a curved end wall.
The melting furnace of claim 1 further comprising:

Silo;

a feeding device, the feeding device being respectively connected to the silo and the feeding port.
A method for treating a material to be melted by using the melting furnace according to any one of claims 1-8, characterized in that it comprises:

And alternately supplying combustion materials to each of the pair of the first regenerative burners and the second regenerative burners to heat the melting space, wherein the combustion materials include gas and air; as well as

Feeding the material to be melted from the feed port into the melting space, so that the material to be melted is sequentially melted through the feed zone, the melting zone, the separation zone, and the discharge zone. The separation treatment is performed to obtain a molten metal and slag, and the molten metal is discharged from the discharge port, and the slag is discharged from the slag discharge port.
The method according to claim 9, wherein the temperature of the melting zone is 1000 to 1800 degrees Celsius, and the temperature of the separation zone is 100 to 200 degrees Celsius lower than the temperature of the melting zone.