CN111270038A - Moving bed reaction furnace for producing sponge iron by gas-based direct reduction - Google Patents
Moving bed reaction furnace for producing sponge iron by gas-based direct reduction Download PDFInfo
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- CN111270038A CN111270038A CN202010261860.6A CN202010261860A CN111270038A CN 111270038 A CN111270038 A CN 111270038A CN 202010261860 A CN202010261860 A CN 202010261860A CN 111270038 A CN111270038 A CN 111270038A
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 96
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 46
- 230000009467 reduction Effects 0.000 title claims abstract description 37
- 238000006243 chemical reaction Methods 0.000 title claims description 56
- 239000007789 gas Substances 0.000 claims abstract description 144
- 239000011343 solid material Substances 0.000 claims abstract description 45
- 239000000112 cooling gas Substances 0.000 claims abstract description 17
- 238000009827 uniform distribution Methods 0.000 claims abstract description 14
- 238000005245 sintering Methods 0.000 claims abstract description 9
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 34
- 239000000463 material Substances 0.000 claims description 20
- 239000002994 raw material Substances 0.000 claims description 9
- 239000003638 chemical reducing agent Substances 0.000 claims description 8
- 238000007599 discharging Methods 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 239000007795 chemical reaction product Substances 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- 239000002131 composite material Substances 0.000 claims description 4
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 4
- 239000000376 reactant Substances 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims 2
- 239000000428 dust Substances 0.000 abstract description 8
- 238000009826 distribution Methods 0.000 abstract description 7
- 239000002918 waste heat Substances 0.000 abstract description 3
- 238000011084 recovery Methods 0.000 abstract 1
- 238000006722 reduction reaction Methods 0.000 description 28
- 238000000034 method Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 238000001465 metallisation Methods 0.000 description 5
- 239000008188 pellet Substances 0.000 description 5
- 238000004939 coking Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 239000010431 corundum Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/10—Making spongy iron or liquid steel, by direct processes in hearth-type furnaces
- C21B13/105—Rotary hearth-type furnaces
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0073—Selection or treatment of the reducing gases
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- Engineering & Computer Science (AREA)
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- Manufacturing & Machinery (AREA)
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- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture Of Iron (AREA)
Abstract
The utility model provides a gas base direct reduction produces moving bed reacting furnace of sponge iron, includes that furnace body direction of height from last upper portion of once connecting slightly enlarges first section (1), middle part barrel section (2) and lower cone section (3): the upper micro-expansion head section is provided with a tail gas outlet (12) and a solid material uniform distribution chute (11), and tail gas dust entrainment is reduced; the middle cylinder section is provided with a reducing gas inlet (21) and a gas distributor (22), and the gas distributor plays roles in gas distribution and solid material rectification; the lower cone section is provided with a cooling gas inlet (32), a solid material outlet (33) and a vertical spiral loosening device (31), the cooling gas inlet realizes medium-low temperature solid material discharge and solid material waste heat recovery, the vertical spiral loosening device realizes axial circulation and radial rotation of the solid material of the bed layer, bed layer sintering is thoroughly avoided, and smooth discharge of the outlet is guaranteed.
Description
Technical Field
The invention belongs to the technical field of metallurgical equipment, and particularly relates to a moving bed reaction furnace for producing sponge iron by gas-based direct reduction.
Background
With the rapid development of the world iron and steel industry and the increasing importance of the international society on environmental protection, the direct reduced iron technology is more and more valued by the iron and steel world, the demand of direct reduced iron is strongly increased, and the global yield of direct reduced iron in 2018 breaks through 1 hundred million tons.
The process for producing sponge iron by gas-based direct reduction mainly comprises Midrex and HYL. Firstly, the load of the subsequent cooling and dedusting process is increased due to the high dust content in the furnace top tail gas in the prior art; secondly, reducing gas directly enters the reaction furnace from the cylinder without a gas distributor, so that the concentration distribution of the reducing gas is uneven, and the metallization rate of sponge iron and the consumption of the reducing gas are influenced; in addition, the cooling gas distributor has a complex structure, so that the problem of solid material coking and blockage is easily caused, and the annual working day of the reaction furnace is reduced.
Disclosure of Invention
The invention aims to overcome the technical defects of the prior gas-based direct reduction production of sponge iron, and provides a moving bed reaction furnace for producing sponge iron by gas-based direct reduction, which solves the problem of high dust content in the tail gas at the top of the furnace by the design of large diameter and height of a slightly enlarged head section at the upper part of the reaction furnace; the uniformity of reduction reaction in the furnace body is ensured through the design of the gas distributor, and the problem of solid material coking and blockage is solved through the arrangement of the vertical spiral loosening device.
The invention has the technical scheme that the moving bed reaction furnace for producing sponge iron by gas-based direct reduction is integrally of a vertical cylindrical structure and comprises an upper micro-enlarged head section, a middle cylinder section and a lower cone section which are fixedly connected in sequence; the upper micro-expansion head section is provided with a component for feeding ferric oxide solid raw materials into the cylinder and a tail gas outlet; the middle cylinder section is a reaction space for producing sponge iron by gas-based direct reduction, and the lower part of the middle cylinder section is provided with a reducing gas inlet and a gas distributor communicated with the reducing gas inlet; the lower cone section comprises a solid material outlet at the most bottom pointed cone and a cooling gas inlet on the conical surface.
The preparation method comprises the following steps of feeding iron oxide solid raw materials through an upper micro-expansion head section, feeding reducing gas through a reducing gas inlet of a middle cylinder section, carrying out reduction reaction on the middle cylinder section to generate sponge iron and reaction tail gas, discharging the tail gas from a tail gas outlet of the upper micro-expansion head section to enter a tail gas treatment process, descending the sponge iron to a lower cone section along with the furnace, and discharging the sponge iron from a solid material outlet after exchanging heat with gas fed from a cooling gas inlet. According to the device, the gas distributor communicated with the reducing gas inlet is arranged, so that the reducing gas is uniformly distributed on the cross section of the cylinder body of the furnace body before being sent into the furnace body to react with solid materials, and the problems that the concentration of the reducing gas is not uniformly distributed after entering the furnace body, and the metallization rate of sponge iron and the consumption of the reducing gas are influenced are solved.
Furthermore, the lower cone section is provided with a material loosening device for enabling reaction products in the lower cone section to perform axial circulation and radial rotation movement, so that bed layer sintering is avoided, and smooth discharging at an outlet is guaranteed.
The lower cone section is reaction product receiving section, because the design of binding off, it is big with material area of contact, and the material is high with preceding temperature of cooling gas heat exchanger, easy sintering, and form the sintering layer on the reacting furnace barrel, set up the material that can make inside material at the height along reacting furnace barrel center pin and radial two directions internal motion in the lower cone section and become flexible the device, can avoid sintering each other between the product well, the layer is tieed on the barrel, and make the material motion make the material whole form effect in these two directions, reach the best design of global motion and preventing local sintering.
Furthermore, the material loosening devices are evenly arranged in 3-6 groups along the circumference of the same horizontal plane of the lower cone section.
Aiming at the high-temperature product solid material in a conical cylinder, a plurality of material loosening devices are arranged along the circumference, so that the reduced iron in the circumference can be uniformly loosened, and the effect of discharging with half the effort is achieved.
Furthermore, above-mentioned material is not hard up the device for vertical spiral, and it includes motor, reduction gear, spiral agitator, the motor is connected and is controlled the reduction gear, reduction gear connection control spiral agitator, spiral agitator's stirring portion is located lower part cone section barrel, and the barrel is passed through sealing member or sealed setting in stirring portion lower part, and is fixed with reduction gear connection in the barrel outside, and is rotatory under the reduction gear control.
The reaction furnace is a sealed reaction cylinder, relatively high requirements are provided for material stirring design in the reaction process, mainly the stirrer penetrates through the inside and outside of the cylinder and is sealed with the contact part of the cylinder, the sealing gas or sealing oil can be adopted for solving the problem, the electrode provides rotary power, the speed of the spiral stirrer is adjusted and controlled by the speed reducer, the stirring part of the spiral stirrer can lift the material within a certain height in the vertical direction while rotating the material in the horizontal direction, the high motion along the central shaft of the cylinder of the reaction furnace is realized, and the aim of loosening the material in two directions to smoothly discharge the material is fulfilled.
Furthermore, the diameter of the upper micro-expansion head section is larger than that of the middle cylinder section, the diameter of the upper micro-expansion head section is 10% -50% larger than that of the middle cylinder section, and the height of the upper micro-expansion head section is 1-2 times of that of the middle cylinder section.
The reaction tail gas has dust, and meets the ferric oxide reaction raw material at the lower part of the upper micro-expansion head section in the rising process, and carries ferric oxide reaction raw material particles, so that the tail gas at the top of the reaction furnace has high dust content.
Furthermore, the iron oxide feeding part at the top of the upper micro-expansion head section is a solid material uniformly-distributed chute, the lower end of the solid material uniformly-distributed chute is positioned at the lower part of the tail gas outlet, and the solid material uniformly-distributed chute comprises 4-12 solid material uniformly-distributed chutes which are uniformly distributed at the top of the upper micro-expansion head section.
The solid material uniform distribution slide pipes are used for further reducing the mixing space of tail gas and iron oxide reaction raw materials, so that iron oxide feeding is sent to the lower part of the upper micro-expansion head section as far as possible, and the materials can be evenly sent by the plurality of solid material uniform distribution slide pipes so as to be evenly mixed and reacted with reducing gas.
Furthermore, the gas distributor is a plate structure formed by circular pipes or calandria, the circular pipes or the calandria are communicated with the reducing gas inlet through a main pipe on the gas distributor, and the circular pipes or the calandria are communicated with each other; the center of the plate-type structure is superposed with the center of the reaction furnace cylinder, and the cross section area of the plate-type structure is not larger than that of the reaction furnace cylinder; and the gaps among the ring pipes or the calandria are used for the solid reactants to pass through, and the ring pipes or the calandria are uniformly distributed with air holes, and the openings of the air holes face to the lower cone section.
The gas distributor plays gas distribution and solid material rectification effect, make the reducing gas that gets into rise after the equipartition on the reaction furnace barrel cross section and react with the iron oxide raw materials, consequently the gas distributor requires to have the space that supplies reaction product sponge iron to go through descending to lower cone section when realizing gas equipartition, get into gas distributor house steward through the reducing gas import, get into each ring canal or calandria through the house steward, evenly distributed has the gas pocket to carry out the equipartition on through ring canal or calandria, the opening setting with the gas pocket has two benefits down: firstly, if the opening of the air hole is upward, the problem that air cannot be discharged because the air hole is blocked by iron oxide and sponge iron particles on the upper part or falling along with the furnace exists, secondly, the air hole is uniformly distributed downwards and then ascends from a gap between the ring pipes or the discharge pipes, so that a small amount of unreduced iron oxide is reduced in the process, and the metallization rate of a product is improved.
Further, the total cross-sectional area of the air holes on the ring pipe or the calandria is 0.2 to 1.2 times, more preferably 0.8 times of the cross-sectional area of the reducing gas inlet. The total sectional area of the air holes is too large, so that the gas distribution is uneven; too small a total cross-sectional area of the pores may restrict flow.
Furthermore, the shell of the cylinder body is made of high-temperature steel which can resist the temperature of more than 1000 ℃, and a composite high-temperature-resistant coating is coated inside the shell of the cylinder body.
The sponge iron is produced by gas-based direct reduction through high-temperature reaction and reduction gas is arranged in the sponge iron, so that the temperature resistance and the reduction resistance of a reaction furnace barrel are correspondingly designed.
Furthermore, the cooling gas component entering the cooling gas inlet is the same as the gas component entering the reducing gas inlet, or is a reducing gas component.
The purpose of the cooling gas inlet is to realize medium and low temperature solid material discharge and recover solid material waste heat. When the components of the cooling gas entering the cooling gas inlet are the same as the components of the gas fed by the reducing gas inlet or are reducing gas components, the components can be heated to a certain temperature after heat exchange and participate in the reaction with the iron oxide raw material in the middle cylinder section, and the heat absorption and reaction dual utilization of the cooling gas is realized.
The benefits of the invention over the prior art are:
1) according to the invention, the micro-expansion head section is arranged at the upper part of the reaction furnace, so that tail gas dust entrainment is reduced, and the load of a subsequent cooling and dedusting process is reduced;
2) the gas distributor with the solid material rectification function is arranged in the middle of the reaction furnace, so that the reducing gas is uniformly distributed in the reaction furnace, and the solid material in the middle of the furnace is prevented from flowing too fast, so that the metallization rate of the sponge iron is improved, and the consumption of the reducing gas is reduced;
3) according to the invention, the vertical spiral loosening device is arranged at the lower part of the reaction furnace, so that bed layer sintering is avoided, smooth discharging at an outlet is ensured, and long-period stable operation of the reaction furnace is ensured.
The moving bed reactor for producing sponge iron by gas-based direct reduction is used in industrial production, can reduce the dust content in tail gas, ensure the uniform concentration distribution of reducing gas in the reactor, improve the metallization rate of sponge iron, reduce the consumption of reducing gas, prevent a solid material outlet from coking and blocking, and realize continuous, efficient and stable operation of the reactor.
Drawings
These and/or other aspects and advantages of the present invention will become more apparent and more readily appreciated from the following detailed description of the embodiments of the invention, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic structural diagram of a gas-based moving bed reactor for producing sponge iron by direct reduction in an embodiment of the present invention;
FIG. 2 is a schematic diagram of a calandria gas distributor in a moving bed reactor for producing sponge iron by gas-based direct reduction in the example of the present invention;
FIG. 3 is a schematic diagram of a ring tube type gas distributor in a moving bed reactor for producing sponge iron by gas-based direct reduction in the embodiment of the present invention;
FIG. 4 is a schematic view of a vertical spiral loosening device in a moving bed reactor for producing sponge iron by gas-based direct reduction in an embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, the following detailed description of the invention is provided in conjunction with the accompanying drawings and the detailed description of the invention.
Example 1
A gas-based moving bed reaction furnace for producing sponge iron by direct reduction has a structure shown in figure 1, is integrally of a vertical cylindrical structure, and comprises an upper micro-enlarged head section 1, a middle cylindrical section 2 and a lower conical section 3 which are sequentially connected from top to bottom, wherein the specific structure and function of each part are as follows:
the upper part of the upper micro-expansion head section 1 is provided with a tail gas outlet 12 for discharging reaction tail gas; the top of the furnace body is provided with solid material uniform distribution slide pipes 11, solid materials such as iron oxide pellets enter the reaction furnace along the solid material uniform distribution slide pipes 11, reduction reaction is carried out in the reaction furnace, 4-12 solid material uniform distribution slide pipes 11 are preferred, 6 solid material uniform distribution slide pipes are more preferred, and furnace burden is guaranteed to be distributed more uniformly in the furnace body; the diameter of the upper micro-expansion head section 1 is larger than that of the middle cylinder section 2, the diameter of the upper micro-expansion head section is 10% -50% larger than that of the middle cylinder section, and the height of the upper micro-expansion head section is 1-2 times of that of the middle cylinder section. To ensure that the tail gas has enough space to settle the dust particles in the tail gas.
The middle cylinder section 2 is a space for reacting reducing gas and iron oxide raw materials, the lower part of the side surface of the middle cylinder section is provided with a reducing gas inlet 21 and a gas distributor 22, the reducing gas inlet 21 is communicated with the gas distributor 22, the center of the gas distributor 22 is coincided with the center of the reaction furnace, and the gas distributor is fixed with the reaction furnace through the reducing gas inlet. The gas distributor is constructed as shown in fig. 2 and 3, and may be preferably designed as a ring pipe distributor or a calandria distributor according to the distribution shape of the gas pipeline therein, wherein a ring pipe 221 or a calandria 222 of the distributor is communicated with the reducing gas inlet 21 through a main pipe of the gas distributor, the ring pipes are communicated with each other through the main pipe of the gas distributor, and the calandria are communicated with each other through the main pipe of the gas distributor; the gaps between the ring pipes or the calandria are used for the products after the reaction to descend along with the furnace, the ring pipes or the calandria are uniformly distributed with air holes, and the openings of the air holes face the lower cone section 3; the reducing gas enters the gas distributor 22 from the reducing gas inlet 21, enters the reaction furnace from the gas holes on the ring pipe or the calandria 221 of the gas distributor, and contacts and reacts with the iron oxide pellets in the furnace, and it can be seen that the gas distributor 22 has the functions of gas distribution and rectification, so that the reducing gas is uniformly distributed in the furnace, and meanwhile, the solid material in the middle part of the furnace is prevented from flowing too fast; the total cross-sectional area of the openings of the gas distributor 22 is preferably designed to be 0.2 to 1.2 times, more preferably 0.8 times, the cross-sectional area of the reducing gas inlet.
The lower-cone section 3 is provided with a cooling gas inlet 32, a solids outlet 33 and a vertical screw loosening device 31: cooling reducing gas enters from a cooling gas inlet 32 and contacts with the high-temperature sponge iron to cool the solid materials, so that the discharge of the medium-low temperature solid materials is realized, and the waste heat of the solid materials is recovered; the structure of the vertical spiral loosening device 31 is shown in fig. 4, and comprises a motor 311, a speed reducer 312 and a spiral stirrer 313, wherein the spiral stirrer 313 penetrates through a cylinder body of the reaction furnace through sealed gas or sealed oil, the stirring part is positioned in the cylinder body and used for stirring materials, the other end of the spiral stirrer is connected with the speed reducer 312 outside the cylinder body, axial circulation and radial rotation of solid materials on a bed layer are realized, sintering of the bed layer is thoroughly avoided, smooth discharging at an outlet is guaranteed, 3-6 groups of vertical spiral loosening devices are preferably designed, and 4 groups of vertical spiral loosening devices are more preferably arranged.
The shell of the moving bed reaction furnace is preferably designed to be made of high-temperature steel which can resist the temperature of more than 1000 ℃, and a composite high-temperature-resistant coating is coated inside the shell; the operation temperature of the reaction furnace is 900-1060 ℃, and the operation pressure is 0.2-0.5 MPa.
Example 2
A gas-based moving bed reactor for producing sponge iron by direct reduction is further detailed in some optional schemes in example 1, and is used for treating iron oxide pellets by the moving bed reactor for producing sponge iron by gas-based direct reduction, wherein the design of a furnace body of the moving bed reactor and the reaction process in the moving bed reactor are as follows:
the shell of the reaction furnace is made of GH474 high-temperature steel, and a composite high-temperature-resistant coating mainly made of corundum is coated inside the reaction furnace. The iron oxide pellets are added into the reaction furnace from a solid material uniform distribution chute 11 at the top of a micro-enlarged head section 1 at the upper part of the reaction furnace, the reduction reaction is completed in the reaction furnace, and the number of the solid material uniform distribution chutes 11 is 6.
The high-temperature reducing gas enters the gas distributor 22 from a reducing gas inlet 21 of the cylinder section 2 in the middle of the reaction furnace, enters the reaction furnace from the air holes on the ring pipe 222 of the gas distributor, and contacts and reacts with iron oxide pellets in the furnace from top to bottom to generate sponge iron; the total sectional area of the openings of the gas distributor 22 is 0.8 times of the sectional area of the gas inlet pipe; the reduction tail gas is discharged from a tail gas outlet 12; the operation temperature of the reaction furnace is 1000 ℃, and the operation pressure is 0.3 MPa.
High temperature sponge iron ball gets into reacting furnace lower part cone section 3, and the cone section sets up 4 perpendicular spiral of group and becomes flexible device 31, carries out the breakage with the coking solid material, and the while is up-pushed with high temperature sponge iron ball, prevents the export jam. The low-temperature reducing gas entering from the cooling reducing gas inlet 32 contacts with the high-temperature sponge iron to be cooled, and cooled solid materials are discharged from the solid material outlet 33.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A gas-based moving bed reaction furnace for producing sponge iron by direct reduction is characterized in that the whole reaction furnace is of a vertical cylindrical structure and comprises an upper micro-enlarged head section (1), a middle cylinder section (2) and a lower cone section (3) which are fixedly connected in sequence;
the upper micro-expansion head section (1) is provided with a component for feeding ferric oxide solid raw materials into the cylinder and a tail gas outlet (12);
the middle cylinder section (2) is a reaction space for producing sponge iron by gas-based direct reduction, and the lower part of the middle cylinder section is provided with a reducing gas inlet (21) and a gas distributor (22) communicated with the reducing gas inlet (21);
the lower cone section (3) comprises a solid material outlet (33) at the bottommost pointed cone and a cooling gas inlet (32) on the cone surface.
2. The moving bed reactor for producing sponge iron by gas-based direct reduction according to claim 1,
the lower cone section (3) is provided with a material loosening device (31) for enabling reaction products in the lower cone section (3) to perform axial circulation and radial rotation movement, so that bed layer sintering is avoided, and smooth discharging of an outlet is guaranteed.
3. The moving bed reactor for producing sponge iron by gas-based direct reduction according to claim 2, wherein the material loosening devices (31) are uniformly arranged in 3-6 groups along the circumference of the lower cone section (3) at the same horizontal plane.
4. The moving bed reactor for producing sponge iron by gas-based direct reduction according to claim 2, wherein the material loosening device is a vertical screw loosening device (31) comprising a motor (311), a speed reducer (312) and a screw stirrer (313), the motor (311) is connected with and controls the speed reducer (312), the speed reducer (312) is connected with and controls the screw stirrer (313), the stirring part of the screw stirrer (313) is positioned in the lower cone section (3) cylinder, the lower part of the stirring part penetrates through the cylinder through sealing arrangement, and is connected and fixed with the speed reducer (321) outside the cylinder and rotates under the control of the speed reducer.
5. The moving bed reactor for producing sponge iron by gas-based direct reduction according to claim 1,
the diameter of the upper micro-expansion head section (1) is larger than that of the middle cylinder section (2), the diameter of the upper micro-expansion head section (1) is 10% -50% larger than that of the middle cylinder section (2), and the height of the upper micro-expansion head section (1) is 1-2 times of that of the middle cylinder section (2).
6. The moving bed reactor for producing sponge iron by gas-based direct reduction according to claim 1 or 5, wherein the iron oxide feeding component at the top of the upper micro-expansion head section (1) is a solid material uniform distribution chute (11), the lower end of the solid material uniform distribution chute (11) is positioned at the lower part of the tail gas outlet (12), the solid material uniform distribution chute (11) comprises 4-12 solid material uniform distribution chutes, and the solid material uniform distribution chutes are uniformly distributed at the top of the upper micro-expansion head section (1).
7. The moving bed reactor for producing sponge iron by gas-based direct reduction according to claim 1, wherein the gas distributor (22) is a plate structure formed by a circular pipe or a calandria pipe, the circular pipe or the calandria pipe is communicated with the reducing gas inlet through a main pipe on the gas distributor, and the circular pipe or the calandria pipe is communicated with each other; the center of the plate-type structure is superposed with the center of the reaction furnace cylinder, and the cross section area of the plate-type structure is not larger than that of the reaction furnace cylinder; the gaps between the ring pipes or the calandria pipes are used for the solid reactants to pass through, and the ring pipes or the calandria pipes are uniformly distributed with air holes, and the openings of the air holes face to the lower cone section (3).
8. The moving bed reactor for producing sponge iron by gas-based direct reduction according to claim 7, wherein the total cross-sectional area of the air holes of the ring pipe or the calandria is 0.2 to 1.2 times the cross-sectional area of the reducing gas inlet (21).
9. The moving bed reactor for producing sponge iron by gas-based direct reduction according to claim 1, wherein the shell of the cylinder is made of high temperature steel which can resist a temperature of more than 1000 ℃, and a composite high temperature resistant coating is coated inside the shell.
10. The moving bed reactor for producing sponge iron by gas-based direct reduction according to claim 1, wherein the composition of the cooling gas introduced into the cooling gas inlet (32) is the same as the composition of the gas introduced into the reducing gas inlet (21).
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116351197A (en) * | 2023-06-01 | 2023-06-30 | 中国华能集团清洁能源技术研究院有限公司 | Flue gas distributor, adsorption tower and low-temperature flue gas adsorption system |
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| CN116351197A (en) * | 2023-06-01 | 2023-06-30 | 中国华能集团清洁能源技术研究院有限公司 | Flue gas distributor, adsorption tower and low-temperature flue gas adsorption system |
| CN116351197B (en) * | 2023-06-01 | 2023-08-29 | 中国华能集团清洁能源技术研究院有限公司 | Flue gas distributor, adsorption tower and low-temperature flue gas adsorption system |
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