CN214781945U - Self-heating gas-based shaft furnace direct reduction device - Google Patents
Self-heating gas-based shaft furnace direct reduction device Download PDFInfo
- Publication number
- CN214781945U CN214781945U CN202120940583.1U CN202120940583U CN214781945U CN 214781945 U CN214781945 U CN 214781945U CN 202120940583 U CN202120940583 U CN 202120940583U CN 214781945 U CN214781945 U CN 214781945U
- Authority
- CN
- China
- Prior art keywords
- gas
- shaft furnace
- self
- section
- cavity
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
- Manufacture Of Iron (AREA)
Abstract
The utility model discloses a self-heating gas-based shaft furnace direct reduction device belongs to the direct reduction field. Including charging devices, shaft furnace body, discharging device, the shaft furnace body includes preheating section, reduction section, changeover portion and cooling zone, and its characterized in that changeover portion is a n cavity that connects in parallel, and every cavity one end and reduction section intercommunication, the other end and cooling zone intercommunication, every cavity all twine electromagnetic induction coil, and induction coil links to each other with the power, and the cooling zone is arranged around the gas inlet of cooling zone shaft evenly distributed. The reducing gas is heated by the hot reducing iron in the shaft furnace, and the reducing iron is heated by the transition section induction coil through electromagnetic induction. The invention can avoid the carbon deposition, blockage or burnthrough of the raw material gas generated by the external heating of the shaft furnaceProblems with heating the pipeline; can also make CO2And NOxZero emission or emission reduction of exhaust gas; and the engineering investment can be reduced.
Description
Technical Field
The utility model belongs to the direct reduction field, concretely relates to self-heating gas-based shaft furnace direct reduction device.
Background
The gas-based shaft furnace direct reduction process is the direct reduced iron technology with the largest yield in the world. The direct reduced iron is used as a high-quality raw material used in industries such as electric furnaces, converters, blast furnaces, powder metallurgy and the like, and has been paid more and more attention by people in the national and metallurgical industries in recent years. The direct reduced iron is used as raw material for electric furnace steel-making, and can raise purity of molten steelThe purity is high-quality raw materials required by special steel smelting. Especially for electric furnace enterprises with unstable scrap steel quality, the direct reduced iron is added to dilute harmful elements in steel and stabilize the molten steel quality. The direct reduced iron does not use coke, and the iron ore does not need sintering, thereby saving coke coal resources, reducing two links of coking and sintering with the largest exhaust emission of iron and steel enterprises, and being more beneficial to environmental protection than a high furnace process. However, the existing gas-based shaft furnace process uses natural gas as raw material gas, while the current situation of Chinese fuel resources is that less gas is used and more coal is used, and the most available gas sources are coke oven gas and coal gas, especially coke oven gas. China is a large coke production country, coke oven gas is abundant, but the technology of taking the coke oven gas as raw material gas cannot apply the technology of a gas-based shaft furnace taking natural gas as a gas source, and the coke oven gas is easy to deposit carbon in the heating process outside the shaft furnace, so that the normal operation of production is influenced, and production accidents are seriously caused, which becomes one of the main reasons restricting the popularization of the gas-based shaft furnace in China; another reason affecting the popularization of gas-based shaft furnaces in China is large investment. The investment of the reforming of the reducing gas raw material, the external heating equipment of the shaft furnace and the matched deep purification equipment accounts for more than 50 percent of the total investment of the equipment, so that the overall investment is overlarge; in addition, the existing gas-based shaft furnace process at least burns 1/3 shaft furnace top gas for heating gases required by reduction reaction, which not only wastes valuable reducing gas resources, but also discharges a large amount of CO2And NOx。
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model provides a self-heating gas-based shaft furnace direct reduction device. The device can avoid the problems of carbon deposition and blockage of a heating pipeline when raw material gas is heated outside the shaft furnace, and ensure the normal operation of production; can also make CO2And NOxZero emission of exhaust gas or reduction of CO2And NOxThe discharge amount of (c); and the equipment investment can be reduced. Other objects of the invention will be pointed out hereinafter or will be apparent to those skilled in the art.
The raw gas of the utility model refers to one or a mixture of several of coke oven gas, natural gas, hydrogen and coal gas, converter gas, blast furnace gas and coal bed gas after carbon dioxide and nitrogen removal.
In order to achieve the above purpose, the utility model adopts the following scheme:
the utility model provides a self-heating gas-based shaft furnace direct reduction device, includes charging devices, shaft furnace body, discharging device, and the shaft furnace body includes preheating section, reduction section, changeover portion and cooling zone, and the changeover portion is n parallelly connected cavitys, every cavity one end and reduction section intercommunication, the other end and cooling zone intercommunication, cavity winding electromagnetic induction coil, and induction coil links to each other with the power, and the cooling zone is arranged around the gas inlet of cooling zone shaft evenly distributed.
Compared with the prior art, the utility model discloses the method has following beneficial effect:
1) the electromagnetic induction heating technology is applied to realize that the feed gas is heated by utilizing high-temperature direct reduced iron in the shaft furnace, the direct reduced iron can enable various hydrocarbon compounds in the feed gas to react with water and/or carbon dioxide to generate useful reducing gas, the self-weight reforming of various hydrocarbon compounds is completed, and the problem that the feed gas is heated outside the shaft furnace to generate carbon deposition and block a heating pipeline is avoided.
2) When the feed gas and the shaft furnace self-produced purified gas are all heated by the hot direct reduced iron, fuel combustion heating is not needed any more, and the whole process has zero emission of waste gas.
3) The external reforming process is not needed, so the investment of the technical proposal of the utility model is greatly reduced;
4) the production cost is reduced because of the high cost of catalyst consumption and low overall investment of the no-furnace reforming process.
The utility model discloses the preferred scheme of device does:
the cavity arrangement of the transition section adopts one of the following two modes:
(1) a central cavity is arranged at the central position of the transition section, and other cavities have the same size and structure and are uniformly distributed around the central cavity in an annular manner;
(2) the transition section is provided with only one cavity.
And a temperature monitoring device is arranged on the inner side of each cavity and is communicated with a switch for controlling the power supply of the induction coil.
The cavity is cylindrical.
And two ends of each cavity are provided with material stopping valves.
The communicating part of each cavity and the reduction section is in a horn mouth shape.
And gas inlets which are uniformly distributed around the reduction section furnace body are arranged at the lower part of the reduction section, and the gas inlets are communicated with a shaft furnace outer gas heating device.
The gas inlet of the cooling section adopts any one of the following structures:
(1) the upper part of the cooling section is provided with a row of gas inlets;
(2) the upper part and the lower part of the cooling section are respectively provided with a row of gas inlets.
The cooling section is provided with a material loosening device.
Compared with the prior art, adopt the utility model discloses an optimal selection scheme still has following beneficial effect:
because the easy carbon deposition components are removed from the shaft furnace self-produced purified gas, the shaft furnace self-produced purified gas can adopt a shaft furnace external gas heating device according to resource conditions of different areas, so that the adaptability of the technology and equipment is improved;
the utility model discloses make full use of direct reduced iron at the magnetism of physics field, electrical property, at the catalyst performance in chemical industry field, at the heat transfer performance in the thermal technology field, combined electromagnetic induction heating technique, hydrocarbon high temperature catalytic reforming technique, ball formula hot-blast furnace technique, both solved the reducing gas raw materials heating carbon deposit problem, also solved the exhaust emission problem, still reduced the equipment investment by a wide margin.
Drawings
FIG. 1 is a schematic structural view of a self-heating gas-based shaft furnace body according to the present invention, wherein a plurality of cylindrical cavities are arranged at a transition section;
FIG. 2 is a schematic cross-sectional view taken along line A-A of FIG. 1 in accordance with the present invention;
FIG. 3 is a schematic structural view of a self-heating gas-based shaft furnace direct reduction device of the present invention, wherein a plurality of cylindrical cavities are arranged at a transition section, and two rows of gas inlets are arranged at a cooling section of the shaft furnace;
FIG. 4 is another schematic structural view of the self-heating gas-based shaft furnace direct reduction device of the present invention, wherein a cylindrical cavity is arranged at the transition section, a row of gas inlets are arranged at the reduction section, and a row of gas inlets are arranged at the cooling section;
FIG. 5 is another schematic structural view of the self-heating gas-based shaft furnace direct reduction device of the present invention, wherein a plurality of cylindrical cavities are arranged in the transition section, a row of gas inlets is arranged in the reduction section, and a row of gas inlets is arranged in the cooling section;
FIG. 6 is another schematic structural view of the self-heating gas-based shaft furnace direct reduction apparatus of the present invention, wherein a cylindrical chamber is disposed at the transition section, and a row of gas inlets of the shaft furnace;
FIG. 7 is a schematic flow diagram of a self-heating gas-based shaft furnace direct reduction process of the present invention, with two rows of gas inlets in the cooling section and multiple cylindrical cavities in the transition section;
FIG. 8 is a schematic flow diagram of another process for the direct reduction of a self-heating gas-based shaft furnace according to the present invention, wherein a row of gas inlets is formed in the reduction section, a row of gas inlets is formed in the cooling section, and a cylindrical cavity is formed in the transition section;
labeled as: 1-a shaft furnace, 11-a shaft furnace preheating section, 12-a shaft furnace reduction section, 13-a shaft furnace cooling section, 14-a shaft furnace transition section, 131-a cooling section loosening device, 141-a cylindrical central cavity, 142-a cylindrical peripheral cavity, 143-refractory materials, 144-an outer furnace body, 145-a temperature monitoring device, 146-an electromagnetic induction coil, 147-a material cutting valve, 151-a shaft furnace gas inlet I, 152-a shaft furnace gas inlet II, 153-a shaft furnace gas inlet III, 16-a shaft furnace top charging device, 2-raw material gas, 3-shaft furnace self-produced purified gas after dust removal and carbon dioxide removal, 31-shaft furnace gas after dust removal, 4-a carbon dioxide removal device, 5-reduced iron, 6-a humidifier and 7-a shaft furnace discharging device, 8-a shaft furnace outer gas heating device and 9-a dust removal device.
Detailed Description
The present invention will be described in detail with reference to the following embodiments in order to fully understand the objects, features and functions of the present invention, but the present invention is not limited thereto.
The shaft furnace body structure with n parallel cavities in the transition section is described below by taking the example of arranging 7 cylindrical cavities in the transition section of the shaft furnace body: referring to fig. 1 and 2, the shaft furnace body 1 includes a preheating section 11, a reducing section 12, a transition section 14 and a cooling section 13. The cooling section is provided with a material loosening device 131, the material loosening device 131 is connected with the cooling section 13 furnace body, the transition section comprises a cylindrical central cavity 141 and 6 cylindrical peripheral cavities 142 which are uniformly distributed in an annular mode, the 6 cylindrical peripheral cavities 142 are identical in structure and size, the cylindrical central cavity 141 and the cylindrical peripheral cavities 142 can be identical in structure and size or different in size, and in the embodiment, the 7 cylindrical cavities are identical in structure and size. One end of each cylindrical central cavity 141 and cylindrical peripheral cavity 142 is communicated with the reduction section 12, the other end is communicated with the cooling section 13, and the communication part with the reduction section is in a bell mouth shape. The furnace bodies of the cylindrical central cavity 141 and the cylindrical peripheral cavity 142 are sequentially made of refractory materials 143, an electromagnetic induction coil 146 and an outer furnace body 144 from inside to outside, the electromagnetic induction coil 146 is wound on the outer wall of the refractory materials 143, the induction coil 146 is connected with a medium-frequency or power-frequency power supply, the induction coil 146 is a hollow copper pipe, the copper pipe is internally cooled by water, temperature monitoring devices 145 are arranged on the inner walls of the cylindrical central cavity 141 and the cylindrical peripheral cavity 142, the temperature monitoring devices 145 control power switches, when the temperature reaches the upper limit of a control range, the switches are turned off, the electromagnetic induction stops working, when the temperature reaches the lower limit of the control range, the switches are turned on, the electromagnetic induction starts working, material intercepting valves 147 are arranged at two ends of each cylindrical cavity and are used for maintaining related facilities of the cylindrical cavities. The upper and lower parts of the cooling section 13 are provided with a second 152 and a third 153 gas inlet of the shaft furnace, which are evenly distributed around the shaft of the cooling section 13.
The following is an embodiment of the self-heating gas-based shaft furnace direct reduction device provided by the utility model:
example one
Referring to fig. 1, 2 and 3, the self-heating gas-based shaft furnace direct reduction device of the present embodiment includes a charging device 16, a shaft furnace body 1, and a discharging device 7, wherein the shaft furnace body 1 includes a preheating section 11, a reduction section 12, a transition section 14 and a cooling section 13. The charging device 16 is communicated with the upper opening of the shaft furnace body 1, and the discharging device 7 is positioned at the lower opening of the shaft furnace body 1. The transition section comprises a cylindrical central cavity 141 and 6 cylindrical peripheral cavities 142 which surround the cylindrical central cavity 141 and are uniformly distributed in an annular manner, the 6 cylindrical peripheral cavities 142 have the same structure and size, the cylindrical central cavity 141 and the cylindrical peripheral cavities 142 can have the same structure and size or can be different from each other, and in the embodiment, the 7 cylindrical cavities have the same structure and size. One end of each cylindrical central cavity 141 and cylindrical peripheral cavity 142 is communicated with the reduction section 12, the other end is communicated with the cooling section 13, and the communication part with the reduction section is in a bell mouth shape. The furnace bodies of the cylindrical central cavity 141 and the cylindrical peripheral cavity 142 are sequentially made of refractory materials 143, an electromagnetic induction coil 146 and an outer furnace body 144 from inside to outside, the electromagnetic induction coil 146 is wound on the outer wall of the refractory materials 143, the induction coil 146 is connected with a medium-frequency or power-frequency power supply, the induction coil 146 is a hollow copper pipe, the copper pipe is internally cooled by water, temperature monitoring devices 145 are arranged on the inner walls of the cylindrical central cavity 141 and the cylindrical peripheral cavity 142, the temperature monitoring devices 145 control power switches, when the temperature reaches the upper limit of a control range, the switches are turned off, the electromagnetic induction stops working, when the temperature reaches the lower limit of the control range, the switches are turned on, the electromagnetic induction starts working, material intercepting valves 147 are arranged at two ends of each cylindrical cavity and are used for maintaining related facilities of the cylindrical cavities. The cooling section 13 is provided with a material loosening device 131, the material loosening device 131 is connected with the furnace body of the cooling section 13, and the upper part of the cooling section 13 is provided with a second shaft furnace gas inlet 152 uniformly distributed around the furnace body of the cooling section 13; in the lower part of the cooling section 13, there are arranged three shaft furnace gas inlets 153 evenly distributed around the shaft of the cooling section 13. The second shaft furnace gas inlet 152 is communicated with a mixed gas pipeline of the shaft furnace for purifying gas 3 and one part of raw material gas 2, and the third shaft furnace gas inlet 153 is communicated with a pipeline of the other part of raw material gas 2.
The purpose of the transition section of the shaft furnace body of the embodiment that the structure of 1 cylindrical central cavity and 6 cylindrical peripheral cavities is adopted is to ensure that the gas flow and the temperature in the shaft furnace are uniformly distributed. In the embodiment, the raw material gas and the shaft furnace self-produced gas are heated and reformed in the shaft furnace, and a heating and reforming system is not arranged outside the shaft furnace.
The method for using the self-heating gas-based shaft furnace direct reduction device in the embodiment is described below by taking coke oven gas as an example:
referring to fig. 1, 2 and 7, in the embodiment, the self-produced purified gas 3 and a part of the raw material gas 2 of the shaft furnace enter the shaft furnace 1 from the second gas inlet 152 at the upper part of the cooling section 13, the other part of the raw material gas 2 enters the shaft furnace 1 from the third gas inlet 153 at the lower part of the cooling section 13, the raw material gas 2 is coke oven gas, and the coke oven gas amount is about 400M3Coke oven gas generally has the following main composition: about 60% H2About 8% CO, about 23% CH4About 2% H2O, about 2% CO2About 3% C2The above unsaturated hydrocarbons. The method comprises the following steps:
iron oxide with the granularity of 8-16mm is added into a gas-based shaft furnace 1 from a top charging device 16, the crude gas produced by the shaft furnace is purified by a dust removal device 9 and a carbon dioxide removal device 4 to form purified gas 3 produced by the shaft furnace, and the amount of the purified gas 3 produced by the shaft furnace is about 1100M3，H2the/CO is about 1.7 to 1.8 and generally has the following main composition: about 56% H2About 31% CO, about 2% CH1About 6% H2O, about 2% CO2. The removed carbon dioxide is made into products such as dry ice and the like for sale or self-use. Mixing a part of coke oven gas with the shaft furnace self-produced purified gas 3, leading the mixed gas to pass through a humidifier 6, increasing the water gas content to meet the reforming requirement of hydrocarbons in the mixed gas, then leading the mixed gas to be injected into the shaft furnace from a second gas inlet 152 on the upper part of a cooling section 13 below the position of an electromagnetic induction coil 146 of the shaft furnace, leading the other part of coke oven gas to be injected into the shaft furnace from a third gas inlet 153 on the lower part of the cooling section 13, leading the coke oven gas injected from the third gas inlet 153 to carry out heat exchange with fallen direct reduced iron 5, simultaneously carrying out carburizing reaction, leading the heated coke oven gas to continuously rise, leading the mixed gas injected from the second gas inlet 152 to flow through an electromagnetic induction heating zone of a cylindrical central cavity 141 and a cylindrical peripheral cavity 142 of a transition section 14 of the shaft furnace together with the mixed gas injected from the third gas inlet 153, leading the mixed gas to be continuously heated by the hot direct reduced iron 5, and when the temperature monitoring device 145 detects that the temperature of the electromagnetic induction heating zone reaches 1000 ℃, the electromagnetic induction power supply is turned off until the temperature monitoring device 145 detects the temperature of the electromagnetic induction heating area again and reaches 900 degrees, and the electromagnetic induction power supplyStarting again, and supplementing heat for the direct reduced iron 5 through electromagnetic induction; in the region of the transition zone 14 of the shaft furnace, the hydrocarbons in the gas mixture are reformed into H by the catalytic action of the direct reduced iron 52And a reducing gas of CO; the reformed hot mixed gas flows out of the transition section 14 of the shaft furnace, enters the reduction section 12 of the shaft furnace, and reacts with the iron oxide falling from the upper part of the shaft furnace through the preheating section 11 in the reverse running process, so that the iron oxide is reduced into direct reduced iron 5; the newly reduced hot direct reduced iron 5 enters the electromagnetic induction heating zone of the transition section 14 of the shaft furnace, and is responsible for heating and reforming newly entered mixed gas continuously at the zone, and is reheated by electromagnetic induction, the direct reduced iron 5 in the transition section 14 of the shaft furnace enters the cooling section 13 of the shaft furnace, in order to prevent the direct reduced iron 5 from bonding in the cooling process, the direct reduced iron 5 is loosened by a loosening device 131, and when the direct reduced iron 5 in the cooling section is cooled to a temperature below about 50 ℃, the direct reduced iron is discharged through a discharging device 7 and conveyed to a product storage yard. On the other hand, the hot mixed gas enters the preheating zone 11 at the upper part of the shaft furnace after reacting with the iron oxide in the reduction zone 12 of the shaft furnace, and the mixed gas flowing out of the preheating zone 11 after preheating the iron oxide therein has a lower temperature than that in the reduction zone 12, H2And a reduced content of CO, H2O and CO2The content is increased to form the self-produced crude gas of the shaft furnace, and the self-produced crude gas enters the dust removing device 9 of the gas of the shaft furnace through a gas pipeline at the top of the shaft furnace.
When the shaft furnace is opened, iron oxide pellets with the granularity of 8-16mm are added into the shaft furnace 1 until reaching the position of the second gas inlet 152 of the furnace body, then carbon steel balls with the granularity of 8-16mm are added, the stacking height of the carbon steel balls is at least flush with the upper end of the induction coil 146, preferably the upper edge of the reduction section 12 is reached, and the iron oxide pellets with the granularity of 8-16mm are added on the carbon steel balls. After charging, the induction coil 146 wound on the furnace body is started to perform electromagnetic induction heating on carbon steel, when the temperature monitoring device 145 detects that the temperature of the electromagnetic induction heating zone reaches 900 ℃, humidified coke oven gas is blown in from the second furnace body gas inlet 152, the coke oven gas flows through the electromagnetic induction heating zone of the transition section 14 of the shaft furnace and is heated by hot carbon steel, and under the catalytic action of the carbon steel, hydrocarbon in the raw material gas in the transition section 14 area of the shaft furnace is reformed into H2And CA reducing gas of O; the reformed hot feed gas exits the shaft furnace transition section 14 and enters the shaft furnace reduction section 12, in this way providing the primary heat for the reduction reaction in the shaft furnace.
Example two
Referring to fig. 1, 2 and 4, the self-heating gas-based shaft furnace direct reduction device of the present embodiment includes a charging device 16, a shaft furnace body 1, and a discharging device 7, wherein the shaft furnace body 1 includes a preheating section 11, a reduction section 12, a transition section 14, and a cooling section 13. The charging device 16 is communicated with the upper opening of the shaft furnace body 1, and the discharging device 7 is positioned at the lower opening of the shaft furnace body 1. In the lower part of the reduction zone 12, there are arranged a first 151 shaft furnace gas inlets evenly distributed around the shaft of the reduction zone 12. The first shaft furnace gas inlet 151 is communicated with one end of a heater 8, and the other end of the heater 8 is communicated with one end of a pipeline of the shaft furnace self-purification gas 3. The cooling section 13 is provided with a material loosening device 131, the material loosening device 131 is connected with the furnace body of the cooling section 13, and the upper part of the cooling section 13 is provided with a second shaft furnace gas inlet 152 which is uniformly distributed around the furnace body of the cooling section 13. The second shaft furnace gas inlet 152 is communicated with a feed gas 2 pipeline. The transition section of this embodiment has only one cylindrical central cavity 141, and one end of the cylindrical central cavity 141 is communicated with the reduction section 12, and the other end is communicated with the cooling section 13, and the communication position with the reduction section is in a bell mouth shape. The internal structure of the cylindrical central cavity 141 is the same as that of the cylindrical central cavity shown in fig. 1, a temperature monitoring device 145 is arranged on the inner wall of the cylindrical central cavity 141, the temperature monitoring device 145 controls a power switch, when the temperature reaches the upper limit of a control range, the switch is turned off, electromagnetic induction stops working, when the temperature reaches the lower limit of the control range, the switch is turned on, the electromagnetic induction starts working, and material intercepting valves 147 are arranged at two ends of each cylindrical cavity and used for maintaining related facilities of the cylindrical cavity. The shaft furnace of this embodiment is externally free of a reforming system.
The method for using the self-heating gas-based shaft furnace direct reduction device in the embodiment is described below by taking coke oven gas as an example:
referring to FIGS. 1, 2 and 8, in this embodiment, after the self-produced purified gas 3 is heated by the external heating furnace 8 of the shaft furnace, the gas enters the shaft furnace 1 from the first gas inlet 151 at the lower part of the reduction section 12, and the raw gas 2 enters the vertical shaft from the second gas inlet 152 at the upper part of the cooling section 13In the furnace 1, the raw material gas 2 is heated by the hot direct reduced iron 5 in the shaft furnace 1, the raw material gas 2 adopts coke oven gas, the coke oven gas amount is about 600M3The components are as described above. The method comprises the following steps:
iron oxide with the granularity of 8-16mm is added into a gas-based shaft furnace 1 from a top charging device 16, crude gas produced by the shaft furnace is dedusted by a dedusting device 9, about 30 percent of the dedusted shaft furnace gas is used as fuel of a heating furnace 8, the rest 70 percent of the gas is treated by a decarbonation device 4 to form purified gas 3 produced by the shaft furnace, and the gas quantity of the purified gas 3 produced by the shaft furnace is about 750M3，H2the/CO was about 1.8, with the composition as described above. The removed carbon dioxide is made into products such as dry ice and the like for sale or self-use. The high-temperature reaction in the shaft furnace removes the components easy to deposit carbon from the shaft furnace self-produced purified gas 3, the carbon is not deposited when the shaft furnace self-produced purified gas 3 is heated outside the shaft furnace, and the H can be improved by adding hydrogen before the shaft furnace self-produced purified gas 3 enters the heating furnace 82the/CO value can also be without adding hydrogen, in the embodiment, after the furnace body is directly heated to 980 ℃ of 900-. The water content of the coke oven gas is improved to meet the requirement of reforming hydrocarbon in the coke oven gas by passing the coke oven gas through a humidifier 6, then the coke oven gas enters the shaft furnace from a gas inlet II 152 below the position of the electromagnetic induction coil 146 of the furnace body, and the gas inlet II 152 of the furnace body is positioned at the upper part of the cooling section 13; the coke oven gas flows through an electromagnetic induction heating zone of a cylindrical central cavity 141 of the shaft furnace transition section 14 and is heated by the hot direct reduced iron 5, when the temperature monitoring device 145 detects that the temperature of the electromagnetic induction heating zone reaches 1050 ℃, an electromagnetic induction power supply is turned off, and when the temperature monitoring device 145 detects that the temperature of the electromagnetic induction heating zone reaches 900 ℃, the electromagnetic induction power supply is turned on to supplement heat for the direct reduced iron 5 through electromagnetic induction; under the catalytic action of the direct reduced iron 5, the hydrocarbons in the feed gas in the region of the transition section 14 of the shaft furnace are reformed into a reducing gas of H2 and CO; the reformed hot feed gas exits the transition section 14 of the shaft furnace and enters the reduction section 12 of the shaft furnace where it joins the shaft furnace autogenously produced purified gas 3 entering from the shaft gas inlet 151The mixed gas reacts with the iron oxide falling from the upper part of the shaft furnace through the preheating section 11 in the reverse running process, and the iron oxide is reduced into direct reduced iron 5; the newly reduced hot direct reduced iron 5 enters the electromagnetic induction heating zone of the transition section 14 of the shaft furnace, and is responsible for heating and reforming the newly entered raw material gas continuously at the zone, and is heated by electromagnetic induction, the direct reduced iron 5 in the transition section 14 of the shaft furnace enters the cooling section 13 of the shaft furnace previously, in order to prevent the direct reduced iron 5 from bonding in the cooling process, the direct reduced iron 5 is loosened by the loosening device 131, when the direct reduced iron 5 in the cooling section is cooled to about 720 plus 750 ℃, the direct reduced iron enters the hot briquetting device through the discharging device 7, is hot-pressed into briquetting iron of 100x50x30mm, and is transported to the product yard; on the other hand, the hot mixed gas enters the preheating zone 11 at the upper part of the shaft furnace after reacting with the iron oxide in the reduction zone 12 of the shaft furnace, and the mixed gas flowing out of the preheating zone 11 after preheating the iron oxide therein has a lower temperature than that in the reduction zone 12, H2And a reduced content of CO, H2O and CO2The content is increased to form the self-produced crude gas of the shaft furnace, and the self-produced crude gas enters the dust removing device 9 of the gas of the shaft furnace through a gas pipeline at the top of the shaft furnace.
EXAMPLE III
Referring to fig. 5, this embodiment is another schematic structural diagram of the self-heating gas-based shaft furnace direct reduction device of the present invention, the transition section is provided with a plurality of cylindrical cavities, and other structures are the same as the embodiment;
example four
Referring to fig. 6, this embodiment is another schematic structural diagram of the self-heating gas-based shaft furnace direct reduction device of the present invention, the transition section is provided with a cylindrical cavity, the shaft furnace has a gas inlet, the second shaft furnace gas inlet 152 is communicated with a mixed gas pipeline of the shaft furnace self-cleaning gas 3 and the feed gas 2, and other structures are the same as those of the first embodiment;
the embodiment is suitable for one or more mixed gases of coke oven gas, natural gas, hydrogen and coal gas, converter gas, blast furnace gas and coal bed gas after carbon dioxide and nitrogen removal.
Finally, it is noted that: the preferred embodiments of the present invention have been shown and described, and it will be understood that modifications and variations may be made by those skilled in the art without departing from the scope of the invention.
Claims (9)
1. The utility model provides a self-heating gas-based shaft furnace direct reduction device, includes charging devices, shaft furnace body, discharging device, and the shaft furnace body is including preheating section, reduction section, changeover portion and cooling zone, and its characterized in that changeover portion is a n cavity that connects in parallel, every cavity one end and reduction section intercommunication, the other end and cooling zone intercommunication, cavity winding electromagnetic induction coil, induction coil links to each other with the power, and the cooling zone is arranged around the gas inlet of cooling zone shaft evenly distributed.
2. A self-heating gas-based shaft furnace direct reduction apparatus according to claim 1, wherein the cavity arrangement of the transition section is one of the following two ways:
(1) a central cavity is arranged at the central position of the transition section, and other cavities have the same size and structure and are uniformly distributed around the central cavity in an annular manner;
(2) the transition section is provided with only one cavity.
3. A self-heating gas-based shaft furnace direct reduction apparatus according to claim 1 or 2, wherein a temperature monitoring device is provided inside each chamber, and the temperature monitoring device is interlocked with a switch for controlling the power supply of the induction coil.
4. A self-heating gas-based shaft furnace direct reduction apparatus according to claim 1 or 2, wherein the chamber is cylindrical.
5. A self-heating gas-based shaft furnace direct reduction apparatus according to claim 1 or 2, wherein a material intercepting valve is provided at both ends of each chamber.
6. A self-heating gas-based shaft furnace direct reduction apparatus according to claim 1 or 2, wherein each chamber is flared at the connection with the reduction zone.
7. A self-heating gas-based shaft furnace direct reduction unit according to claim 1, wherein gas inlets are arranged in the lower part of the reduction zone and evenly distributed around the shaft of the reduction zone, the gas inlets communicating with the shaft furnace external gas heating unit.
8. A self-heating gas-based shaft furnace direct reduction apparatus according to claim 1, wherein the gas inlet of the cooling zone is any one of the following structures
(1) The upper part of the cooling section is provided with a row of gas inlets;
(2) the upper part and the lower part of the cooling section are respectively provided with a row of gas inlets.
9. A self-heating gas-based shaft furnace direct reduction apparatus according to claim 1, wherein the cooling zone is provided with a tripper.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120940583.1U CN214781945U (en) | 2021-05-06 | 2021-05-06 | Self-heating gas-based shaft furnace direct reduction device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120940583.1U CN214781945U (en) | 2021-05-06 | 2021-05-06 | Self-heating gas-based shaft furnace direct reduction device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214781945U true CN214781945U (en) | 2021-11-19 |
Family
ID=78691780
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120940583.1U Active CN214781945U (en) | 2021-05-06 | 2021-05-06 | Self-heating gas-based shaft furnace direct reduction device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214781945U (en) |
-
2021
- 2021-05-06 CN CN202120940583.1U patent/CN214781945U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA3139620C (en) | Direct reduction process utilizing hydrogen | |
| CN104212930B (en) | A kind of BAOSHEREX iron-smelting process of two-step smelting molten iron | |
| CN112899427B (en) | Hydrogen shaft furnace iron making system and method using electric energy for heating | |
| CN101260448B (en) | Fusion reduction iron-smelting method for directly using concentrate powder | |
| CN101724726B (en) | Method and device for ironmaking by smelting | |
| CN100463975C (en) | Production of sponge iron | |
| CN112410494B (en) | Iron-making device and method capable of applying suspension melting reduction of fine-grained fine ores | |
| CN105296699B (en) | It is a kind of to avoid the fused reduction iron-smelting device and method that prereduction ore deposit is reoxidized | |
| CN105734190B (en) | Oxygen blast furnace and gas-based shaft kiln Joint Production system and combine production method | |
| CN114672602B (en) | Method for smelting vanadium titanium ore by coke oven gas-based shaft furnace and smelting vanadium titanium ore by electric furnace in deep reduction mode | |
| CN107299175A (en) | A kind of system and method for fluid bed gas, gas-based reduction and electric furnace steel making coupling | |
| CN107858471A (en) | A kind of system and method for gas-based shaft kiln production sponge iron | |
| CN115449579B (en) | Low-carbon smelting reduction iron-making method and device | |
| CN109055643A (en) | A kind of coal gas shaft furnace system and iron smelting method based on induction supplementary heating structure | |
| CN107904347B (en) | Coal-based direct reduction shaft furnace and reduction method thereof | |
| CN109913606A (en) | A kind of coal hydrogen shaft furnace ironmaking system and technique based on induction heating | |
| ZA200209311B (en) | Method and device for producing pig iron or liquid steel pre-products from charge materials containing iron ore. | |
| CN214781945U (en) | Self-heating gas-based shaft furnace direct reduction device | |
| CA1060218A (en) | Process and a furnace plant for batch production of sponge metal | |
| CN115305305A (en) | Self-heating gas-based shaft furnace direct reduction method and reduction device | |
| CN207130291U (en) | A kind of system of fluid bed gas, gas-based reduction and electric furnace steel making coupling | |
| CN207738786U (en) | A kind of system of no coal method production ferrochrome | |
| CN217684954U (en) | Industrial gas heating system | |
| CN218755849U (en) | Atmosphere-adjustable gas-based direct reduction iron-making system | |
| CN115896378B (en) | Electric energy heating hydrogen direct reduction iron-making method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |