Coal gasification and smelting reduction coupled tempering co-production furnace and tempering co-production process method

Abstract

The invention provides a coal gasification and smelting reduction coupled tempering co-production furnace and a tempering co-production process method. The coal gasification and smelting reduction coupled tempering co-production furnace comprises a smelting gasification furnace and a coal gasification mineral powder burner device, the hearth of the melting gasification furnace comprises a gasification section positioned at the upper part and a molten pool positioned at the lower part; the coal gasification mineral powder burner device comprises a first coal gasification burner and a first spray gun; the first coal gasification burner penetrates into the center of the hearth from the top of the melting gasification furnace; the first spray gun penetrates through the side wall of the melting gasification furnace; the outlet end of the first spray gun is located above the molten pool and faces the surface of the molten pool; the first coal gasification burner is constructed to be a coal water slurry gasification burner or a pulverized coal gasification burner and is used for spraying coal or coal slurry for gasification and an oxidizing agent, and the first spray gun is constructed to be an ore-pulverized coal mixed solid spray gun and is used for spraying iron-containing minerals and carbon-containing materials; by means of the tempering co-production furnace, a reducing atmosphere can be formed on the upper layer of the molten pool, iron loss of the molten pool is reduced, and heat is supplied to the molten pool through coal gasification flames.

Description

Technical Field

[0001] The invention belongs to the technical field of metallurgical smelting, and in particular relates to a tempering co-generation furnace coupled with coal gasification and smelting reduction. Background Art

[0002] The smelting reduction ironmaking process is centered on the smelting reduction furnace. It produces high-quality pure iron by directly injecting iron ore powder and non-coking coal into the liquid iron pool in the smelting reduction furnace. Compared with the traditional blast furnace ironmaking process, the smelting reduction ironmaking process has lower requirements for raw materials; and because the sintering and coking steps are omitted, the smelting reduction ironmaking process can save a lot of investment and operating costs under the same production capacity.

[0003] In the smelting reduction ironmaking process, the Hismelt technology is the most mature one. This technology uses pneumatic injection to spray solid coal powder and iron ore powder into the molten pool, and a reduction reaction occurs in the high-temperature molten pool. The C (carbon) in the coal and the Fe in the ore powder react with each other to form a molten iron ore. 2 O 3 (Fe(III) oxide) reacts to generate CO (carbon monoxide) and Fe (iron). This reaction is an endothermic reaction. The generated CO overflows from the molten pool and burns with the oxygen-enriched air injected from the oxygen lance on the top of the furnace, and supplies heat to the molten pool through radiation.

[0004] However, due to the high secondary combustion rate of the Hismelt process, the CO generated in the molten pool is converted into O 2 (Oxygen) is burned in large quantities, and the oxygen content in the gas above the molten pool is high, with high oxidizing properties and low reducing properties, causing part of the Fe reduced by C in the molten pool to be re-oxidized to FeO (iron oxide), which increases iron loss. In addition, because FeO is highly corrosive, the service life of the refractory in the molten pool is relatively short. At the same time, since only molten iron is produced, most of the exhaust gas has been burned to CO due to the high secondary combustion rate. 2 (carbon dioxide) and H 2 O (water) can only be used for heating, resulting in the overall low economy of this furnace type.

[0005] In practical applications, a smelting device using the Hismelt technology is usually equipped with an oxygen nozzle on the top to spray oxygen-containing gas into the furnace. A plurality of solid nozzles are arranged on the side wall of the furnace to spray the raw materials of the iron-containing material and / or the carbonaceous material with a carrier gas. In the molten pool, the iron-containing raw materials and the carbonaceous material undergo a reduction reaction and melt to generate molten iron and slag. At the same time, the reaction generates CO and overflows from the surface of the molten pool. The oxygen-containing gas sprayed from the top is high-temperature oxygen-rich or air, which burns with the CO generated in the molten pool to generate CO. 2The heat generated by the combustion heats the molten pool by radiation, providing heat for the reduction reaction in the molten pool and heat for melting the iron ore. However, since the atmosphere below the molten pool is a reducing atmosphere (high carbon content) and the atmosphere above the molten pool is an oxidizing atmosphere (high oxygen content), the reduced Fe in the molten pool will be re-oxidized to iron oxide by the oxygen above the molten pool, resulting in a high iron oxide content in the molten pool, which not only corrodes the refractory of the molten pool, but also increases iron loss.

[0006] It can be seen that the current smelting technology still has the following problems that need to be solved urgently:

[0007] 1. There is a reducing atmosphere below the molten pool and an oxidizing atmosphere above the molten pool. The reduced Fe in the molten pool will be reoxidized to iron oxide by the oxygen above the molten pool, resulting in a high FeO content in the molten pool, which corrodes the refractory of the molten pool and also increases iron loss;

[0008] 2. Most of the synthesis gas such as CO produced in the molten pool is burned as fuel, and high-temperature flue gas is discharged, resulting in high overall coal consumption and poor economic efficiency of this technology. Summary of the invention

[0009] In view of the above problems existing in the prior art, the present invention provides a coal gasification and smelting reduction coupled tempering cogeneration furnace capable of realizing both coal gasification and smelting ironmaking processes in the same furnace.

[0010] To achieve the above purpose, the technical solution adopted by the embodiment of the present invention is:

[0011] On the one hand, the present invention provides a tempering co-production furnace coupled with coal gasification and smelting reduction, comprising: a smelting gasification furnace and a coal gasification mineral powder burner device; the furnace of the smelting gasification furnace comprises: a gasification section located at the top and a molten pool located at the bottom; the coal gasification mineral powder burner device comprises: a plurality of first coal gasification burners and a plurality of first spray guns; the first coal gasification burners penetrate from the top of the smelting gasification furnace to the center of the furnace; the outlet end of the first coal gasification burner is close to the liquid surface of the molten pool; the first spray gun passes through the the side wall of the melting gasification furnace; the outlet end of the first spray gun is located above the molten pool and faces the surface of the molten pool; the first coal gasification burner is constructed as a water-coal slurry gasification burner or a pulverized coal gasification burner, which is used to spray coal or coal slurry for gasification and an oxidant, and the first spray gun is constructed as a mineral powder coal powder mixed solid spray gun, which is used to spray iron-containing minerals and carbon-containing materials; or, the first coal gasification burner is constructed to spray coal or coal slurry for gasification and an oxidant, and the first spray gun is constructed as a single mineral powder spray gun, which is used to spray iron-containing mineral powder.

[0012] In some embodiments of the present invention, the coal gasification and smelting reduction coupled tempering furnace also includes a water-cooled riser and a flue pipe; the water-cooled riser penetrates into the furnace from the top of the melt-gasification furnace and surrounds the first coal gasification burner in the gasification section; the melt-gasification furnace is connected to an external waste heat boiler through the flue pipe.

[0013] In some embodiments of the present invention, the melter-gasifier is provided with a connecting hole on the side wall near the bottom thereof; the melter-gasifier is connected with an external slag and iron tapping connecting vessel through the connecting hole; an inductor coil is wound around the periphery of the slag and iron tapping connecting vessel.

[0014] On the one hand, the present invention provides a tempering co-production furnace coupled with coal gasification and smelting reduction, comprising: a smelting gasification furnace and a coal gasification mineral powder burner device; the furnace of the smelting gasification furnace comprises: a gasification section located at the top and a molten pool located at the bottom; the coal gasification mineral powder burner device comprises: a coal gasification mineral powder coal burner and a first coal gasification burner nested from the inside to the outside; the coal gasification mineral powder coal burner and the first coal gasification burner penetrate from the top of the smelting gasification furnace to the center of the furnace; the corresponding outlet ends are close to the liquid surface of the molten pool; the first coal gasification burner is used to spray coal or coal slurry and oxidant for gasification; the coal gasification mineral powder coal burner is used to spray mineral powder and coal powder; or, the coal gasification mineral powder coal burner The burner device includes: a first coal gasification burner and a mineral powder spray gun, and a pulverized coal spray gun; the mineral powder spray gun and the first coal gasification burner are nested from the inside to the outside, and the coal gasification mineral powder coal burner and the first coal gasification burner penetrate from the top of the melter gasifier to the center of the furnace; the corresponding outlet ends are close to the liquid surface of the molten pool; the pulverized coal spray gun passes through the side wall of the melter gasifier, and its outlet end is located above the molten pool and faces the surface of the molten pool; the first coal gasification burner is used to spray gasification coal or coal slurry and oxidant; the mineral powder spray gun is used to spray mineral powder; the pulverized coal spray gun is used to spray coal powder; the mineral powder is pre-melted and the reduced coal powder is pyrolyzed by a high-temperature coal gasification flame.

[0015] In some embodiments of the present invention, the coal gasification and smelting reduction coupled tempering furnace also includes a water-cooled riser and a flue pipe; the water-cooled riser penetrates into the furnace from the top of the melt-gasification furnace and surrounds the mineral powder spray gun in the gasification section; the melt-gasification furnace is connected to an external waste heat boiler through the flue pipe.

[0016] In some embodiments of the present invention, the melter-gasifier is provided with a connecting hole on the side wall near the bottom thereof; the melter-gasifier is connected with an external slag and iron tapping connecting vessel through the connecting hole; an inductor coil is wound around the periphery of the slag and iron tapping connecting vessel.

[0017] On the one hand, the present invention provides a tempering co-production furnace coupled with coal gasification and smelting reduction, comprising: a smelting gasifier, a coal gasification mineral powder burner device and a high-speed synthesis gas burner; the furnace of the smelting gasifier comprises: a gasification section located at the top and a molten pool located at the bottom; the coal gasification mineral powder burner device penetrates from the top of the smelting gasifier to the center of the furnace; the outlet end of the coal gasification mineral powder burner device is close to the liquid surface of the molten pool; the coal gasification mineral powder burner device comprises: a mineral powder spray gun and a first coal gasification burner nested from the inside to the outside; the high-speed synthesis gas burner passes through the side wall of the smelting gasifier, and its outlet end is located above the molten pool and faces the surface of the molten pool; the high-speed synthesis gas burner is used to spray high-temperature hydrogen-rich synthesis gas into the molten pool at a near or supersonic speed through under-oxygen combustion, so that the high-temperature synthesis gas undergoes a reduction reaction with the mineral powder in the molten pool.

[0018] In some embodiments of the present invention, the coal gasification and smelting reduction coupled tempering co-production furnace also includes a waste heat boiler, a dust collector, a washing tower, a synthesis gas conversion unit and a low-temperature methanol elution device connected in sequence; the outlet end of the low-temperature methanol elution device is connected to the high-speed synthesis gas burner; the waste heat boiler is connected to the flue pipe of the molten gasification furnace; the dust collector and the washing tower are used for washing and dust removal; the synthesis gas enters the synthesis gas conversion unit, the carbon monoxide in the synthesis gas is reacted with water gas to generate hydrogen and carbon dioxide, the carbon dioxide is eluted by the low-temperature methanol elution device, the hydrogen is mixed with oxygen, and a high-temperature hydrogen-rich synthesis gas is generated by incomplete combustion, and is sprayed into the molten pool through the high-speed synthesis gas burner.

[0019] In some embodiments of the present invention, the coal gasification and smelting reduction coupled tempering co-production furnace also includes a water-cooled riser and a flue pipe; the water-cooled riser penetrates into the furnace from the top of the melting gasification furnace and surrounds the mineral powder spray gun in the gasification section; the melting gasification furnace is connected to an external waste heat boiler through the flue pipe; the melting gasification furnace is provided with a connecting hole on the side wall near the bottom thereof; the melting gasification furnace is connected to an external slag and iron tapping connecting vessel through the connecting hole; an inductor coil is wound around the periphery of the slag and iron tapping connecting vessel.

[0020] On the other hand, the present invention also provides a tempering co-production process method, which is used for the tempering co-production furnace coupled with coal gasification and smelting reduction, and the method comprises the following steps: the synthesis gas generated by the tempering co-production furnace coupled with coal gasification and smelting reduction enters the waste heat boiler for cooling; the cooled synthesis gas enters the dust collector and the washing tower for washing and dust removal; the synthesis gas after washing and dust removal enters the synthesis gas conversion unit, and the CO in the synthesis gas after washing and dust removal is converted into a mixed gas H by a water-gas reaction 2 and CO 2 ; Mixed gas H 2and CO 2 CO is eluted by low temperature methanol 2 ; Mix the eluted and separated hydrogen with oxygen, and make the residual oxygen coefficient of the mixed gas containing hydrogen and oxygen less than 1; Incompletely burn the mixed gas containing hydrogen and oxygen to form a high-temperature hydrogen-rich synthesis gas, and spray it into the molten pool through a high-temperature burner.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] The coal gasification and smelting reduction coupled tempering furnace of the present invention, by arranging a coal gasification burner at the top of the furnace, changes the oxidizing atmosphere of the upper layer of the molten pool into a reducing atmosphere, and heats the molten pool through the coal gasification flame, and at the same time arranging a gasification section above the molten pool, so that the molten furnace can produce both molten iron and synthesis gas. Accordingly, it is avoided that the reduced iron in the molten pool is re-oxidized to iron oxide by the oxygen above the molten pool, thereby effectively reducing the iron oxide content in the molten pool, thereby reducing the corrosion of the molten pool refractory by iron oxide, thereby reducing iron loss and improving economic efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In the drawings, which are not necessarily drawn to scale, the same reference numerals may describe similar parts in different views. The same reference numerals with letter suffixes or different letter suffixes may represent different instances of similar parts. The accompanying drawings generally illustrate various embodiments by way of example and not limitation, and together with the specification and claims, are used to illustrate the disclosed embodiments. When appropriate, the same reference numerals are used throughout the drawings to refer to the same or similar parts. Such embodiments are illustrative and are not intended to be exhaustive or exclusive embodiments of the present apparatus or method.

[0024] Figure 1 It is a schematic structural diagram of a tempering cogeneration furnace coupled with coal gasification and smelting reduction according to a first embodiment of the present invention;

[0025] Figure 2 It is a schematic structural diagram of a tempering cogeneration furnace coupled with coal gasification and smelting reduction according to a second embodiment of the present invention;

[0026] Figure 3 It is a schematic structural diagram of a coal gasification and smelting reduction coupled tempering cogeneration furnace according to a third embodiment of the present invention;

[0027] Figure 4 It is a schematic structural diagram of a coal gasification and smelting reduction coupled tempering cogeneration furnace according to a fourth embodiment of the present invention;

[0028] Figure 5 It is a structural schematic diagram of a coal gasification and smelting reduction coupled tempering cogeneration furnace according to a fifth embodiment of the present invention;

[0029] Figure 6 A schematic diagram of a synthesis gas conversion process in a tempering cogeneration furnace coupled with coal gasification and smelting reduction according to a fifth embodiment of the present invention;

[0030] Figure 7 It is a schematic diagram of the furnace synthesis gas flow field of the tempering co-generation furnace coupled with coal gasification and smelting reduction according to the first to fifth embodiments of the present invention;

[0031] Figure 8 This is the tempering co-production process method used in the fifth embodiment of the present invention.

[0032] Description of Reference Numerals

[0033] 1-first coal gasification burner; 2-water-cooled riser; 3-gasification section;

[0034] 4-ore powder and coal powder mixed solid spray gun; 5-molten pool; 6-flue pipe;

[0035] 7-slag and iron discharging connecting vessel; 8-single mineral powder spray gun; 9-coal gasification mineral powder burner;

[0036] 10- pulverized coal spray gun; 11- coal gasification pulverized coal burner; 12- high-speed synthesis gas burner; DETAILED DESCRIPTION

[0037] Below, the specific embodiments of the present invention are described in detail in conjunction with the accompanying drawings, but they are not intended to limit the present invention. In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific implementation methods. Below, the embodiments of the present invention are further described in detail in conjunction with the accompanying drawings and specific implementation methods, but they are not intended to limit the present invention.

[0038] All terms (including technical terms or scientific terms) used in the present disclosure have the same meanings as those understood by ordinary technicians in the field to which the present disclosure belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries, such as general dictionaries, should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined herein.

[0039] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0040] At present, in the molten reduction ironmaking process, the gas in the upper layer of the molten pool has a high oxygen content, high oxidizing property and low reducing property, which causes part of the Fe reduced by C in the molten pool to be re-oxidized to FeO, that is, iron loss is increased, resulting in low reduction ironmaking efficiency. To this end, the present invention provides the following solutions:

[0041] On the one hand, combined with Figure 1 and Figure 2 The present invention provides a tempering cogeneration furnace coupled with coal gasification and smelting reduction, comprising: a smelting gasification furnace and a coal gasification mineral powder burner 9 device; the furnace of the smelting gasification furnace comprises: a gasification section 3 located at the top and a molten pool 5 located at the bottom; the coal gasification mineral powder burner device comprises: a plurality of first coal gasification burners 1 and a plurality of first lances; the first coal gasification burner 1 penetrates from the top of the smelting gasification furnace to the center of the furnace; the outlet end of the first coal gasification burner 1 is close to the liquid surface of the molten pool 5; the first lance passes through the side wall of the smelting gasification furnace; the outlet end of the first lance is located above the molten pool 5 and faces the surface of the molten pool 5; specifically, in the first embodiment, see Figure 1 The first coal gasification burner 1 is constructed as a water-coal slurry gasification burner or a pulverized coal gasification burner for injecting gasification coal or coal slurry and an oxidant, and the first lance is constructed as a pulverized coal mixed solid lance 4 for injecting iron-containing minerals and carbon-containing materials; or, in the second embodiment, see Figure 2 The first coal gasification burner 1 is configured to spray coal or coal slurry for gasification and an oxidant, and the first spray gun is configured as a single mineral powder spray gun 8, which is configured to spray iron-containing mineral powder. In this embodiment, through the above-mentioned setting method and corresponding functions, a reducing atmosphere can be formed above the molten pool 5, thereby preventing the reduced iron in the molten pool 5 from being re-oxidized to iron oxide by the oxygen above the molten pool 5, thereby reducing iron loss and improving economic efficiency. The detailed process will be described below. In this embodiment, a reducing atmosphere generally refers to the combustion of fuel under oxygen-deficient conditions to generate CH 4 , CO, H 2 Such as reducing gases, but a gas atmosphere with very low oxygen content.

[0042] Furthermore, combined with Figure 1 to Figure 2 The coal gasification and smelting reduction coupled tempering furnace further comprises a water-cooled riser 2 and a flue pipe 6; the water-cooled riser 2 penetrates the furnace from the top of the melter-gasifier and surrounds the first coal gasification burner 1 in the gasification section 3; the melter-gasifier is connected to an external waste heat boiler through the flue pipe 6. Figures 1 to 5 The melt-gasification furnace is provided with a connecting hole on the side wall near the bottom thereof; the melt-gasification furnace is connected to the external slag and iron discharge connecting vessel 7 through the connecting hole; the outer periphery of the slag and iron discharge connecting vessel 7 is wound with an inductor coil. In the embodiment of the present invention, a gap is preset between the water-cooled riser 2 and the inner wall of the furnace, and the specific width of the gap can be adjusted accordingly according to needs and is not limited here. By changing the flow field in the furnace, a stable reflux is formed, which reduces the airflow entrainment rate of mineral powder and coal powder (see Figure 7), effectively solving the problem in the prior art that, due to the lack of recirculation zone in the flow field in the furnace, the solid particles (including coal powder and mineral powder) carried by the furnace gas are directly carried away with the flue gas, resulting in high entrainment losses.

[0043] In addition, the flue pipe 6 is located outside the furnace of the melter-gasifier (the same below).

[0044] Further, in the first embodiment, see Figure 1 The first coal gasification burner 1 is constructed as a water-coal slurry gasification burner or a pulverized coal gasification burner, which is used to spray coal for gasification or coal slurry and an oxidant. With this structure, the coal for gasification (or coal slurry) and the oxidant (such as oxygen, water vapor, air or oxygen-enriched air) can be sprayed into the gasification section 3 of the furnace to carry out the coal gasification reaction. Since the first coal gasification burner 1 is inserted into the interior of the furnace, the burner flame of the first coal gasification burner 1 approaches or impacts the liquid surface of the molten pool 5, providing heat for the reaction of the molten pool 5 and the melting of the solid, thereby ensuring that the temperature of the molten pool 5 is greater than 1500°C. In this embodiment, there are requirements for the ratio of oxygen in the oxidant to carbon in the coal, that is, there are requirements for the oxygen-coal ratio, for example, the atomic ratio of O:C is approximately equal to 1, and corresponding adjustments are made in combination with the temperature of the molten pool 5 and the detection results of the composition of the out-of-furnace synthesis gas to ensure that the temperature of the molten pool 5 is greater than 1500°C, wherein the generated synthesis gas is a reducing atmosphere (usually CO and H 2 ). In order to ensure that the atmosphere of the furnace is a reducing atmosphere, prevent the reduced iron from being oxidized, and reduce iron loss, in an embodiment of the present invention, the gasification section 3 of the furnace needs to ensure that the synthesis gas has a sufficient reaction residence time in the furnace, for example, the residence time of the synthesis gas in the furnace is 2 to 10S (the same below).

[0045] Furthermore, in the first embodiment, the first coal gasification burner 1 maintains a reasonable distance from the liquid surface of the molten pool 5 to ensure that the flame can directly impact the molten pool 5 for heating the molten pool 5, for example, the distance is 0.5 to 5 m; in addition, it can also be flexibly adjusted according to actual application conditions.

[0046] Correspondingly, the first spray gun is a coal-powder-mixed solid spray gun 4, which is used to spray iron-containing minerals and carbon-containing materials; the coal-powder-mixed solid spray gun 4 adopts a pneumatic conveying method to spray iron-containing minerals and carbon-containing materials into the molten pool 5 at high speed. In the molten pool 5, the iron-containing minerals and carbon-containing materials undergo a reduction reaction and gradually melt. At this time, in the reaction of FeO+C=Fe+CO in the molten pool 5, the CO generated in the molten pool 5 and the CO and H generated by the gasification reaction are 2 The synthesis gas forms a circulating flow field in the furnace with the first coal gasification burner 1 as the axis. After the synthesis gas generated in the furnace descends from the outside of the water-cooled riser 2, that is, after descending in the gap between the water-cooled riser 2 and the inner wall of the furnace, it rises from the inside of the water-cooled riser 2 and leaves the furnace through the flue pipe 6, sending the high-temperature synthesis gas to the outside.

[0047] In the first embodiment, the connecting hole below the molten pool 5 is connected to the slag and iron discharging connecting vessel 7. An inductor coil is sleeved on the outside of the connecting vessel to ensure the internal temperature of the connecting vessel. The connecting vessel is controlled by the pressure difference between the furnace pressure and the pressure outside the furnace to intermittently discharge slag and iron (the same below).

[0048] In the second embodiment, see Figure 2 The first coal gasification burner 1 is configured to spray coal or coal slurry and an oxidant for gasification, and the first spray gun is configured as a single mineral powder spray gun 8 for spraying iron-containing mineral powder. In the present embodiment, the first coal gasification burner 1 reduces the oxygen-coal ratio by increasing the amount of pulverized coal, that is, reduces the O:C atomic ratio, so that excess coal falls directly into the molten pool 5 without completing the gasification reaction, and undergoes a reduction reaction with the mineral powder sprayed into the molten pool 5 through the single mineral powder spray gun 8. By adopting the technical solution of the second embodiment of the present invention, the coal spraying equipment of the molten pool 5 can be omitted without affecting the overall design concept, thereby reducing the equipment investment accordingly.

[0049] On the one hand, combined with Figure 3 and Figure 4 The present invention provides a tempering cogeneration furnace coupled with coal gasification and smelting reduction, comprising: a smelting gasification furnace and a coal gasification mineral powder burner device; the furnace of the smelting gasification furnace comprises: a gasification section 3 located at the top and a molten pool 5 located at the bottom; the coal gasification mineral powder burner device comprises: a coal gasification mineral powder coal burner 11 and a first coal gasification burner 1 nested from the inside to the outside; the coal gasification mineral powder coal burner 11 and the first coal gasification burner 1 penetrate from the top of the smelting gasification furnace to the center of the furnace; the corresponding outlet ends are close to the liquid surface of the molten pool 5; specifically, in the third embodiment, see Figure 3 , the first coal gasification burner 1 is used to inject gasification coal or coal slurry and oxidant; the coal gasification ore powder coal powder burner 11 is used to inject ore powder and coal powder; or, in the fourth embodiment, see Figure 4 The coal gasification mineral powder burner device includes: a mineral powder spray gun and a first coal gasification burner 1, and a pulverized coal spray gun 10; the mineral powder spray gun and the first coal gasification burner 1 are nested from the inside to the outside, and the coal gasification mineral pulverized coal powder burner 11 and the first coal gasification burner 1 penetrate from the top of the melter gasifier to the center of the furnace; the corresponding outlet ends are close to the liquid surface of the molten pool 5; the pulverized coal spray gun 10 passes through the side wall of the melter gasifier, and its outlet end is located above the molten pool 5 and faces the surface of the molten pool 5; the first coal gasification burner 1 is used to spray gasification coal or coal slurry and oxidant; the mineral powder spray gun is used to spray mineral powder; the pulverized coal spray gun 10 is used to spray coal powder; the mineral powder is pre-melted and the reduced coal powder is pyrolyzed by the high-temperature coal gasification flame.

[0050] Furthermore, the coal gasification and smelting reduction coupled tempering cogeneration furnace further includes a water-cooled riser 2 and a flue pipe 6; the water-cooled riser 2 penetrates the furnace from the top of the melter-gasifier and surrounds the mineral powder spray gun in the gasification section 3; the melter-gasifier is connected to an external waste heat boiler through the flue pipe 6. Furthermore, the melter-gasifier is provided with a connecting hole on the side wall near the bottom thereof; the melter-gasifier is connected to an external slag and iron tapping connecting vessel 7 through the connecting hole; the outer periphery of the slag and iron tapping connecting vessel 7 is wound with an inductor coil.

[0051] Specifically, in the third embodiment, see Figure 3 , the coal gasification ore pulverized coal burner 11 is arranged at the center of the first coal gasification burner 1. In this case, the reducing coal is no longer added with oxygen, and pyrolysis occurs only in the flame of the first coal gasification burner 1. During the pyrolysis process, the reducing coal is sprayed directly into the molten pool 5 instead of being sprayed from the coal gasification ore pulverized coal burner 11, and the coal powder is pyrolyzed. Most of the S (sulfur) elements in the reducing coal are taken out of the furnace of the melting gasification furnace with the pyrolysis gas, thereby reducing the S content of the reduced iron in the molten pool 5 and correspondingly improving the quality of the reduced iron, thereby saving the user the cost of desulfurization outside the furnace; at the same time, in this embodiment, since the side wall is not arranged with a spray gun, the overall investment of the melting gasification furnace is reduced. In addition, in the third embodiment, the ore powder is sprayed into the furnace through the coal gasification ore pulverized coal burner 11, and the ore powder passes through the coal gasification flame area, and is heated by a flame greater than 2000°C, and quickly absorbs heat and melts, and the melted ore powder falls into the molten pool 5.

[0052] In the fourth embodiment, see Figure 4 The mineral powder gun 9 is at the center of the coal gasification mineral powder burner 11. The mineral powder is sprayed into the furnace through the mineral powder gun 9 by pneumatic conveying. The mineral powder passes through the coal gasification flame area and is heated by a flame greater than 2000°C, and quickly absorbs heat and melts. The melted mineral powder falls into the molten pool 5. At this time, there is only the pulverized coal spray gun 10 on the side wall of the furnace, and the pulverized coal spray gun 10 no longer sprays mineral powder. By adopting the technical solution of the fourth embodiment, the mineral powder can fall into the molten pool 5 in a molten state and provide heat for the molten pool 5, which correspondingly reduces the load of the flame heating the molten pool 5, thereby improving the thermal efficiency.

[0053] Comparing the fourth embodiment with the third embodiment, it can be found that in the third embodiment, the pulverized coal spray gun 10 in the fourth embodiment is cancelled, and the pulverized coal spray gun 10 and the mineral powder spray gun 9 are specifically combined into a coal gasification mineral pulverized coal burner 11 to construct a corresponding technical solution. Although there are differences in structure between the two, both can meet the functions and beneficial effects required by the technical solution of the present invention. In addition, in particular, both embodiments also consider the following problems existing in the prior art, for example, the heat of the reaction of the molten pool 5 and the melting of the solid completely comes from the radiation of the oxygen-containing and rising synthesis gas combustion flame above the molten pool 5, and the heat is radiated from the flame to the surface of the molten pool 5 and then transferred to the bottom of the pool, which has low thermal efficiency and high coal consumption; while in the third and fourth embodiments, the mineral powder passes through the coal gasification flame area and quickly absorbs heat to melt, so as to achieve pre-melting of the mineral powder, correspondingly increase the temperature of the mineral powder entering the furnace, reduce the heat absorption load of the molten pool 5, and improve the heating efficiency.

[0054] On the one hand, see Figure 5 and Figure 6 The present invention provides a tempering co-production furnace coupled with coal gasification and smelting reduction, comprising: a smelting gasifier, a coal gasification mineral powder burner device and a high-speed synthesis gas burner 12; the furnace of the smelting gasifier comprises: a gasification section 3 located at the top and a molten pool 5 located at the bottom; the coal gasification mineral powder burner device penetrates from the top of the smelting gasifier to the center of the furnace; the outlet end of the coal gasification mineral powder burner device is close to the liquid surface of the molten pool 5; specifically, in the fifth embodiment, the coal gasification mineral powder burner device comprises: a mineral powder spray gun and a first coal gasification burner 1 nested from the inside to the outside; a high-speed synthesis gas burner 12 passes through the side wall of the smelting gasifier, and its outlet end is located above the molten pool 5 and faces the surface of the molten pool 5; the high-speed synthesis gas burner 12 is used to spray high-temperature hydrogen-rich synthesis gas into the molten pool 5 at a near or supersonic speed through under-oxygen combustion, so that the high-temperature synthesis gas undergoes a reduction reaction with the mineral powder in the molten pool 5.

[0055] Further, see Figure 6In the fifth embodiment, the coal gasification and smelting reduction coupled tempering cogeneration furnace further includes a waste heat boiler, a dust collector, a washing tower, a synthesis gas conversion unit and a low-temperature methanol elution device connected in sequence; the outlet end of the low-temperature methanol elution device is connected to the high-speed synthesis gas burner 12; the waste heat boiler is connected to the flue pipe 6 of the smelting gasification furnace; the dust collector and the washing tower are used for washing and dust removal; the synthesis gas enters the synthesis gas conversion unit, the carbon monoxide in the synthesis gas is reacted with water gas to generate hydrogen and carbon dioxide, the carbon dioxide is eluted by the low-temperature methanol elution device, the hydrogen is mixed with oxygen, and a high-temperature hydrogen-rich synthesis gas is generated by incomplete combustion, and is sprayed into the molten pool 5 through the high-speed synthesis gas burner 12. In this embodiment, the waste heat boiler is connected to the outside of the flue pipe 6 to recover the heat of the synthesis gas and produce steam as a by-product to provide energy for the downstream process, thereby realizing a green cycle and being beneficial to environmental protection.

[0056] In the fifth embodiment, see Figure 6 The synthesis gas produced by the melt gasifier enters the waste heat boiler after passing through the flue pipe 6, and is cooled in the waste heat boiler. Then, it passes through the dust collector and the washing tower. Part of the synthesis gas enters the synthesis gas conversion unit, and the CO in the synthesis gas is converted into hydrogen and carbon dioxide through the water-gas reaction. The chemical reaction formula is CO+H 2 O=H 2 +CO 2 , and when passing through the low-temperature methanol elution device, CO is eluted by low-temperature methanol 2 Finally, the remaining hydrogen is mixed with a small amount of oxygen at the burner nozzle of the high-speed syngas burner 12. At this time, the residual oxygen coefficient of the high-speed syngas burner 12 is less than 1, and it is in a state of oxygen-deficient combustion. The incomplete combustion generates high-temperature hydrogen-rich syngas, which is sprayed into the molten pool 5 through the high-speed syngas burner 1212. The speed of the high-temperature hydrogen-rich syngas passing through the nozzle of the high-speed syngas burner 12 is near the speed of sound or supersonic, for example, Ma≈1 or Ma>1. The high-temperature hydrogen-rich syngas penetrates the surface of the molten pool 5 and reacts with the mineral powder inside the molten pool 5. The chemical reaction formula is FeO+H 2 =Fe+H 2 O; continuously supply ore powder to the molten pool 5 of the melt gasifier, and pass the ore powder through the ore powder injection gun to meet the continuous progress of the reduction reaction; in the technical solution of this embodiment, the coal-based molten reduction is changed to hydrogen-based molten reduction, and the ore powder (iron ore powder) is reduced by passing high-temperature hydrogen-rich synthesis gas into the molten pool 5, and the remaining CO 2 It can be removed by low-temperature methanol washing, which can greatly reduce CO 2 emissions and achieve green and low-carbon ironmaking.

[0057] Furthermore, the coal gasification and smelting reduction coupled tempering co-production furnace also includes a water-cooled riser 2 and a flue pipe 6; the water-cooled riser 2 penetrates into the furnace from the top of the melting gasification furnace and surrounds the mineral powder spray gun in the gasification section 3; the melting gasification furnace is connected to the external waste heat boiler through the flue pipe 6; the melting gasification furnace is provided with a connecting hole on the side wall near its bottom; the melting gasification furnace is connected to the external slag and iron discharge connecting vessel 7 through the connecting hole; the outer periphery of the slag and iron discharge connecting vessel 7 is wound with an inductor coil.

[0058] In addition, in the first to fifth embodiments described above, the melt pool 5 section of the melt gasifier can be built with refractory bricks or amorphous refractory materials. In addition to the water-cooled riser 2 structure mentioned above, the gasification section 3 of the melt gasifier can also use a water-cooled coil, a jacketed pipe or a water-cooled wall structure. The coal used in the first coal gasification burner 1 can be mainly gasified bituminous coal, and the coal used in the melt pool 5 can be mainly low-volatile anthracite. The specific type of coal used can be adjusted accordingly according to the actual application scenario and needs, and is not limited here. At the same time, in the first to fifth embodiments described above, in addition to being able to produce molten iron, synthesis gas can also be produced at the same time, thereby bringing economic benefits to users.

[0059] On the other hand, see Figure 8 The present invention also provides a tempering co-production process method, which is used for the tempering co-production furnace coupled with coal gasification and smelting reduction, and the method comprises the following steps: step S1, the synthesis gas generated by the tempering co-production furnace coupled with coal gasification and smelting reduction enters the waste heat boiler for cooling; step S2, the synthesis gas after cooling enters the dust collector and the washing tower for washing and dust removal; step S3, the synthesis gas after washing and dust removal enters the synthesis gas conversion unit, and the CO in the synthesis gas after washing and dust removal is converted into a mixed gas H by a water-gas reaction 2 and CO 2 ; Step S4, the mixed gas H 2 and CO 2 CO is eluted by low temperature methanol 2 ; Step S5, mixing the eluted and separated hydrogen with oxygen, and making the residual oxygen coefficient of the mixed gas containing hydrogen and oxygen less than 1; Step S6, incompletely burning the mixed gas containing hydrogen and oxygen to form a high-temperature hydrogen-rich synthesis gas, and spraying it into the molten pool 5 through a high-temperature burner.

[0060] In addition, although illustrative embodiments are described herein, the scope includes any and all embodiments having equivalent elements, modifications, omissions, combinations (e.g., combinations of schemes across various embodiments), adjustments, or variations based on the present disclosure. The elements in the claims are to be interpreted broadly based on the language used in the claims and are not limited to the examples described in this specification or during the continuation of this application. In addition, the steps of the disclosed methods may be modified in any way, including by reordering steps or inserting or deleting steps. Therefore, it is intended that the description be viewed merely as an example, with the true scope being represented by the following claims and their full range of equivalents.

[0061] The above description is intended to be illustrative and not restrictive. For example, the above examples (or one or more aspects thereof) can be used in combination with each other. After reading the above description, other embodiments may be used by a person of ordinary skill in the art, for example. Moreover, in the above detailed description, various features may be combined together to simplify the present disclosure. This should not be interpreted as intending that the disclosed features that are not requested for protection are essential to any claim. Therefore, the following claims are incorporated into the specific implementation as examples or embodiments, wherein each claim itself is a separate embodiment, and it can be expected that these embodiments can be combined with each other in various combinations or permutations. The scope of the present invention should be determined with reference to the attached claims and the full scope of equivalents given by these claims.

Claims

1. A tempering furnace coupled with coal gasification and smelting reduction, characterized in that: include: Melting gasifier and coal gasification mineral powder burner device; The furnace of the melt-gasification furnace comprises: a gasification section located at the top and a molten pool located at the bottom; The coal gasification mineral powder burner device comprises: a plurality of first coal gasification burners and a plurality of first spray guns; The first coal gasification burner penetrates from the top of the melter-gasifier to the center of the furnace; the outlet end of the first coal gasification burner is close to the liquid surface of the molten pool; The first lance passes through the side wall of the melter-gasifier; the outlet end of the first lance is located above the molten pool and faces the surface of the molten pool; The first coal gasification burner is a water-coal slurry gasification burner or a pulverized coal gasification burner for spraying coal or coal slurry and an oxidant for gasification, and the first spray gun is a pulverized coal mixed solid spray gun for spraying iron-containing minerals and carbon-containing materials; or The first coal gasification burner is configured to spray coal or coal slurry and oxidant for gasification, and the first spray gun is configured as a single mineral powder spray gun for spraying iron-containing mineral powder.

2. The tempering cogeneration furnace coupled with coal gasification and smelting reduction according to claim 1 is characterized in that: Also included are water-cooled riser and flue pipes; The water-cooled riser penetrates into the furnace from the top of the melter-gasifier and surrounds the first coal gasification burner in the gasification section; The melter-gasifier is in communication with an external waste heat boiler through the flue pipe.

3. The tempering cogeneration furnace coupled with coal gasification and smelting reduction according to claim 1 is characterized in that: The melt-gasification furnace is provided with a connecting hole on the side wall near the bottom thereof; the melt-gasification furnace is connected with an external slag and iron tapping connecting vessel through the connecting hole; an inductor coil is wound around the outer periphery of the slag and iron tapping connecting vessel.

4. A tempering furnace coupled with coal gasification and smelting reduction, characterized in that: include: Melting gasifier and coal gasification mineral powder burner device; The furnace of the melt-gasification furnace comprises: a gasification section located at the top and a molten pool located at the bottom; The coal gasification mineral powder burner device comprises: a coal gasification mineral powder coal powder burner and a first coal gasification burner nested from the inside to the outside; the coal gasification mineral powder coal powder burner and the first coal gasification burner penetrate from the top of the melt gasification furnace to the center of the furnace; the corresponding outlet ends are close to the liquid surface of the molten pool; the first coal gasification burner is used to spray gasification coal or coal slurry and oxidant; the coal gasification mineral powder coal powder burner is used to spray mineral powder and coal powder; or, The coal gasification mineral powder burner device comprises: a first coal gasification burner and a mineral powder spray gun, and a pulverized coal spray gun; the mineral powder spray gun and the first coal gasification burner are nested from the inside to the outside, and the coal gasification mineral powder coal burner and the first coal gasification burner penetrate from the top of the melter gasifier to the center of the furnace; the corresponding outlet ends are close to the liquid surface of the molten pool; the pulverized coal spray gun passes through the side wall of the melter gasifier, and its outlet end is located above the molten pool and faces the surface of the molten pool; the first coal gasification burner is used to spray coal or coal slurry and oxidant for gasification; the mineral powder spray gun is used to spray mineral powder; the pulverized coal spray gun is used to spray coal powder; The mineral powder is pre-melted and the reduced coal powder is pyrolyzed by the high-temperature coal gasification flame.

5. The tempering cogeneration furnace coupled with coal gasification and smelting reduction according to claim 4 is characterized in that: Also included are water-cooled riser and flue pipes; The water-cooled riser penetrates into the furnace from the top of the melter-gasifier and surrounds the mineral powder spray gun in the gasification section; The melter-gasifier is in communication with an external waste heat boiler through the flue pipe.

6. The tempering cogeneration furnace coupled with coal gasification and smelting reduction according to claim 4 is characterized in that: The melt-gasification furnace is provided with a connecting hole on the side wall near the bottom thereof; the melt-gasification furnace is connected with an external slag and iron tapping connecting vessel through the connecting hole; an inductor coil is wound around the outer periphery of the slag and iron tapping connecting vessel.

7. A tempering furnace coupled with coal gasification and smelting reduction, characterized in that: include: Melting gasifier, coal gasification mineral powder burner device and multiple high-speed synthesis gas burners; The furnace of the melt-gasification furnace comprises: a gasification section located at the top and a molten pool located at the bottom; The coal gasification mineral powder burner device penetrates from the top of the melt-gasification furnace to the center of the furnace; the outlet end of the coal gasification mineral powder burner device is close to the liquid surface of the molten pool; The coal gasification mineral powder burner device comprises: a mineral powder spray gun and a first coal gasification burner nested from inside to outside; The high-speed syngas burner passes through the side wall of the melt-gasification furnace, and its outlet end is located above the molten pool and faces the surface of the molten pool; the high-speed syngas burner is used to spray high-temperature hydrogen-rich syngas into the molten pool at a near or supersonic speed through under-oxygen combustion, so that the high-temperature syngas undergoes a reduction reaction with the mineral powder in the molten pool.

8. The tempering cogeneration furnace coupled with coal gasification and smelting reduction according to claim 7 is characterized in that: It also includes a waste heat boiler, a dust collector, a washing tower, a synthesis gas conversion unit and a low-temperature methanol elution device which are connected in sequence; the outlet end of the low-temperature methanol elution device is connected to the high-speed synthesis gas burner; The waste heat boiler is in communication with the flue pipe of the melter-gasifier; The dust collector and the washing tower are used for washing and dust removal; The synthesis gas enters the synthesis gas conversion unit, and the carbon monoxide in the synthesis gas is converted into hydrogen and carbon dioxide through a water-gas reaction. The carbon dioxide is eluted through the low-temperature methanol elution device, and the hydrogen is mixed with oxygen to generate a high-temperature hydrogen-rich synthesis gas through incomplete combustion, and is sprayed into the molten pool through the high-speed synthesis gas burner.

9. The coal gasification and smelting reduction coupled tempering cogeneration furnace according to claim 8, characterized in that: Also included are water-cooled riser and flue pipes; The water-cooled riser penetrates into the furnace from the top of the melter-gasifier and surrounds the mineral powder spray gun in the gasification section; The melter-gasifier is connected to an external waste heat boiler through the flue pipe; The melt-gasification furnace is provided with a connecting hole on the side wall near the bottom thereof; the melt-gasification furnace is connected with an external slag and iron tapping connecting vessel through the connecting hole; an inductor coil is wound around the outer periphery of the slag and iron tapping connecting vessel.

10. A tempering co-production process method, used in the tempering co-production furnace coupled with coal gasification and smelting reduction as claimed in claim 8, characterized in that: The process includes the following steps The synthesis gas generated by the tempering co-generation furnace coupled with coal gasification and smelting reduction enters the waste heat boiler for cooling; The cooled synthesis gas enters the dust collector and scrubber for scrubbing and dust removal; The syngas after scrubbing and dust removal enters the syngas conversion unit, and the CO in the syngas after scrubbing and dust removal is converted into a mixed gas of H2 and CO2 through a water-gas reaction; The mixed gas H2 and CO2 is eluted with low-temperature methanol to remove CO2; Mixing the eluted and separated hydrogen with oxygen, and making the residual oxygen coefficient of the mixed gas containing hydrogen and oxygen less than 1; The mixed gas containing hydrogen and oxygen is incompletely burned to form a high-temperature hydrogen-rich synthesis gas, which is then sprayed into the molten pool through a high-temperature burner.

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