CN217536114U - Trolley type roasting reduction system - Google Patents

Abstract

The utility model discloses a car-type calcination reduction system belongs to the ferrous metallurgy direct reduction ironmaking technology field. The system comprises: the trolley type roasting machine comprises a trolley, a sealed smoke hood is mounted on the trolley, a conveying device is arranged in the smoke hood, the trolley comprises a drying section, a preheating section and a high-temperature reduction section, and two groups of combustion chambers which are arranged in parallel are mounted right above the smoke hood in the high-temperature reduction section of the trolley; the combustion chamber is communicated with the storage bin through a sealing device, and the sealing device is communicated with the electric arc furnace; the top combustion type hot blast stove is communicated with the combustion chamber and is communicated with the drying section of the trolley through a dust removing device. The trolley type roasting reduction system can be used for preparing honeycomb diversion material blocks for strengthening mass and heat transfer and a direct reduction iron-making process.

Description

Trolley type roasting reduction system

Technical Field

The utility model belongs to the technical field of ferrous metallurgy direct reduction ironmaking, concretely relates to car-type calcination reduction system.

Background

The blast furnace iron-making process is a foundation stone of the modern steel industry and plays a very important role in the whole steel industry. The main processes of blast furnace iron making comprise coking, agglomeration (sintering and pelletizing), blast furnace smelting and the like, but the processes all have strong dependence on resources and have great pollution to the environment. Blast furnace iron making has strict requirements on raw fuel entering a furnace, high-grade iron ore with certain particle size needs to be used, some lean ore or fine ore needs to be further processed by ore dressing and agglomeration processes, the requirement on metallurgical coke is increased in the process, but the storage amount of high-quality coking coal is limited, so that the cost of blast furnace iron making is greatly increased. In addition, a large amount of substances harmful to the environment are generated in the processes of ore dressing, agglomeration, coking and blast furnace ironmaking. In the long-flow production mainly comprising coking, sintering, blast furnace and converter, nearly 60 percent of energy consumption, 70 percent of cost per ton of steel and 90 percent of pollutant emission are concentrated in the coking, sintering and blast furnace ironmaking processes. At present, the development of a non-blast furnace ironmaking method which does not depend on coking coal and high-grade iron ore and is economic and environment-friendly is urgently needed.

The non-blast furnace ironmaking process takes non-coking coal as a main energy source, does not need procedures such as ore dressing, agglomeration and the like, has better requirements and adaptability to raw fuel than the traditional blast furnace ironmaking process, thereby greatly shortening the production flow and having the characteristics of strong controllability, low cost, little pollution and low emission. Direct reduction processes are divided into gas-based direct reduction and coal-based direct reduction according to the use of a reducing agent, and a reducing gas mainly composed of natural gas, hydrogen or carbon monoxide widely used in a gas-based direct reduction method also has a pressure in terms of resource supply.

In the raw material preparation phase, the current mainstream practice includes two methods, namely directly loading iron ore powder into a container, and pressing the raw material into pellets or other shapes. In the process of low-temperature reduction of iron ore, normal-temperature slag iron separation and electric furnace steel making, granular pellets, iron ore and carbon residue are used as raw materials for reduction reaction and are loaded into a rotary kiln; in the direct reduction process of the carbon-blending porous block in the iron ore powder mentioned in patent CN 104195276A, raw materials such as iron ore, reducing agent and the like are mixed to prepare a material block. In the former case, although the forming process is omitted, the mass and heat transfer of the reaction process is a very limiting factor due to the material characteristics. Meanwhile, the phenomenon of local reflow agglomeration caused by overlong contact time of local materials and high-temperature furnace gas is easily caused due to uneven mass and heat transfer. In addition, the treatment process of the powdery material is complicated and continuous large-scale production is not easy to realize. In the latter case, the quality of the final product is often affected by the degree of compactness of the material block, the manner of heat supply, the degree of uniformity of heat supply, and the like.

In any of the methods for treating the raw material, the heating speed of the surface is much higher than the heat conduction speed in the material, which inevitably causes the condition that the surface of the material is initially melted and the interior of the material does not reach the temperature required by the reaction, thus having bad influence on the reaction speed, the reduction rate and the metallization rate of the reduction product. Under such conditions, the quality of the product can only be maintained by prolonging the time of the high-temperature reduction reaction, with a consequent higher cost. Therefore, how to improve the mass and heat transfer conditions of the materials in the direct reduction process and increase the mass and heat transfer speed, the reaction interface, the product metallization rate and the overall reduction efficiency becomes a urgent need. On the basis of this, the prior art proposes to treat the material into lumps with holes, and in the prior art a checker brick for hot blast stoves with gas passages is mentioned, but only the specific opening characteristics of the lumps and the detailed treatment of the surface of the lumps are mentioned. In addition, the selection problem of the reduction process is also a problem to be solved urgently, and the gas-based direct reduction process is widely applied as the existing mature non-blast furnace ironmaking process, but is always limited by resources. The traditional coal-based direct reduction process is limited to small-scale production and part of the production process is still imperfect.

SUMMERY OF THE UTILITY MODEL

Therefore, in order to solve the above problems, the utility model discloses combine sintering pallet and belt roasting machine's theory of operation to provide a car-type calcination reduction system on the basis of traditional coal-based direct reduction method, it can be used to strengthen the cellular water conservancy diversion material piece preparation and the direct reduction ironmaking technology of mass transfer heat transfer.

In order to solve the technical problem, the utility model provides a technical scheme as follows:

according to the utility model discloses technical scheme provides a car-type calcination reduction system, include: a trolley type roasting machine, a top combustion hot blast stove, an electric arc furnace and a dust removing device,

the trolley type roasting machine comprises a trolley, wherein a sealed smoke hood is mounted on the trolley, a conveying device is arranged in the smoke hood, the trolley comprises a drying section, a preheating section and a high-temperature reduction section which are sequentially arranged, and two groups of combustion chambers which are arranged in parallel are mounted right above the smoke hood in the high-temperature reduction section of the trolley;

the combustion chamber is communicated with the storage bin through a sealing device, and the sealing device is communicated with the electric arc furnace;

the top combustion type hot blast stove is communicated with the combustion chamber and is communicated with the drying section of the trolley through a dust removing device.

Further, an exhaust fan is arranged between the top combustion type hot blast stove and the dust removal equipment.

Furthermore, air boxes are arranged between the drying section and the preheating section and between the preheating section and the high-temperature reduction section.

Further, a secondary air inlet pipe is arranged on the combustion chamber.

Furthermore, two side cavities in the combustion chamber are respectively provided with retaining walls in opposite directions, and each side cavity side wall is provided with a turbulent flow nozzle inserted into the nozzle brick.

Furthermore, the main body of the turbulent flow nozzle as a whole comprises a coal powder injection pipe, a burner coaxially arranged with the coal powder injection pipe, a primary air inlet pipe, an oxygen-enriched pipe and a spoiler.

Furthermore, the pulverized coal injection pipe comprises an inlet pipe section with a small pipe diameter and a flared pipe section far away from the inlet pipe section, a flow dividing pipe which is distributed coaxially with the inlet pipe section is arranged in the flared pipe section, an inner air channel is formed between the flow dividing pipe and the combustor, an annular flow channel is formed between the flow dividing pipe and the flared pipe section, and spoilers with slightly different swirl angles are respectively arranged at the tail part of the inner air channel; an outer air channel is formed between the flared pipe section of the pulverized coal injection pipe and the inner wall of the nozzle brick into which the turbulent flow nozzle is inserted, and the outer air channel is communicated with the primary air inlet pipe and the oxygen enrichment pipe.

High-temperature reducing gas sprayed by the turbulence nozzles firstly enters a side cavity of the combustion chamber, further reacts in the side cavity and realizes voltage-sharing and flow-equalizing under the action of a retaining wall, finally the reducing gas in the side cavities on two sides enters a main cavity of the combustion chamber together, penetrates through stacked material layers under the action of an exhaust fan, completes the high-temperature reduction process, high-temperature flue gas after the reaction of the high-temperature reduction section sequentially passes through a preheating section and a drying section through a flue gas circulation system to complete the preheating and drying of the material blocks, finally, dust is removed through dust removal equipment under the action of a fan, the dust is removed, the dust and air blown in by an air fan are blown into a top combustion type hot blast stove together, and generated hot air enters the turbulence nozzles through a primary air inlet pipe.

Furthermore, the regular hexagonal grate fully distributed with the circular through holes is placed on the grate of the trolley type roasting machine, and the size of the regular hexagonal grate is sequentially reduced along the directions of the drying section, the preheating section and the high-temperature reduction section.

Further, the top combustion stove is communicated with an air fan.

The beneficial effects of the utility model reside in that: the utility model discloses the car-type calcination reduction device that the method provided has promoted the abundant of combustion reaction through the rational configuration to combustion chamber structure and nozzle structure, has improved the homogeneity of combustion efficiency and material piece surface air current temperature and pressure, avoids the material piece local appearing overburning, the light burning phenomenon, improves the quality of result by a wide margin.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below.

Fig. 1 is a system structure diagram of the present invention.

FIG. 2 is a schematic view showing the arrangement of combustion chambers in the bogie hearth type roasting reduction apparatus.

FIG. 3 is a schematic view of the main structure of the combustion chamber.

FIG. 4 is a schematic view of a turbulent nozzle structure for a bogie type roasting reduction apparatus.

Fig. 5 is a schematic view of the main structure of the car-type roasting machine.

Description of reference numerals: in the figure: 1. a feeding bin; 2. a trolley; 3. a smoke cage; 4. a conveying device; 5. a combustion chamber; 6. a secondary air inlet pipe; 7. a trolley charge level sealing device; 8. a storage bin; 9. an air box; 10. a dust removal device; 11. an exhaust fan; 12. an electric arc furnace; 13. an air blower; 14. a turbulent flow nozzle; 15. a secondary air inlet swirler; 16. retaining walls; 17. a burner; 18. a pulverized coal injection pipe; 19. a primary air inlet pipe; 20. an oxygen enrichment pipe; 21. an inner air duct; 22. a circulation channel; 23. a spoiler; 24. an outer air duct; 25, nozzle bricks; 26. a shunt tube; 27. a top-fired hot blast stove; 28. a grate.

Detailed Description

The present invention will be further described with reference to the accompanying drawings.

The utility model relates to a car-type calcination reduction system, include: the trolley type roasting machine comprises a trolley, a sealed smoke hood is mounted on the trolley, a conveying device is arranged in the smoke hood, the trolley comprises a drying section, a preheating section and a high-temperature reduction section, and two groups of combustion chambers which are arranged in parallel are mounted right above the smoke hood in the high-temperature reduction section of the trolley;

the combustion chamber is communicated with the storage bin through a sealing device, and the sealing device is communicated with the electric arc furnace;

the top combustion hot blast stove is communicated with the combustion chamber and is communicated with the drying section of the trolley through a dust removing device.

Preferably, an exhaust fan is arranged between the top-burning hot blast stove and the dust removal equipment.

Preferably, air boxes are arranged between the drying section and the preheating section and between the preheating section and the high-temperature reduction section.

Preferably, the combustion chamber is provided with a secondary intake pipe.

Preferably, retaining walls in opposite directions are respectively arranged in the two side cavities in the combustion chamber, and a turbulent flow nozzle inserted into the nozzle brick is installed on the side wall of each side cavity.

Preferably, the turbulent flow nozzle comprises a pulverized coal injection pipe, a burner coaxially arranged with the pulverized coal injection pipe, a primary air inlet pipe, an oxygen-enriched pipe and a spoiler as a whole.

Preferably, the pulverized coal injection pipe comprises an inlet pipe section with a smaller pipe diameter and a flared pipe section far away from the inlet pipe section, a flow dividing pipe which is distributed coaxially with the inlet pipe section is arranged in the flared pipe section, an inner air duct is formed between the flow dividing pipe and the burner, an annular flow passage is formed between the flow dividing pipe and the flared pipe section, and spoilers with slightly different swirl angles are respectively arranged at the tail part of the inner air duct; an outer air channel is formed between the flared pipe section of the pulverized coal injection pipe and the inner wall of the nozzle brick into which the turbulent flow nozzle is inserted, and the outer air channel is communicated with the primary air inlet pipe and the oxygen enrichment pipe.

High-temperature reducing gas sprayed by the turbulence nozzles firstly enters a side cavity of the combustion chamber, further reacts in the side cavity and realizes voltage-sharing and flow-equalizing under the action of a retaining wall, finally the reducing gas in the side cavities on two sides enters a main cavity of the combustion chamber together, penetrates through stacked material layers under the action of an exhaust fan, completes the high-temperature reduction process, high-temperature flue gas after the reaction of the high-temperature reduction section sequentially passes through a preheating section and a drying section through a flue gas circulation system to complete the preheating and drying of the material blocks, finally, dust is removed through dust removal equipment under the action of a fan, the dust is removed, the dust and air blown in by an air fan are blown into a top combustion type hot blast stove together, and generated hot air enters the turbulence nozzles through a primary air inlet pipe.

Preferably, the car-type roasting machine is provided with a regular hexagon grate which is fully distributed with circular through holes on the grate, and the size of the regular hexagon grate is reduced in sequence along the directions of the drying section, the preheating section and the high-temperature reduction section.

Preferably, the top combustion hot blast stove is communicated with an air fan.

Examples

As shown in figure 1, the trolley type roasting reduction system is used for preparing a honeycomb-shaped guide material block for strengthening mass transfer and heat transfer chemical reaction and a direct reduction iron-making process, and comprises the steps of material mixing, briquetting, drying, reduction and the like. Wherein:

the mixing steps of the materials are as follows: uniformly mixing iron-containing materials, carbonaceous reducing agents, composite binders, water and the like, wherein the corresponding mass ratio is 100: 15-20: 2 to 4:12 to 18. The mass of the iron-bearing material is calculated as the mass of total iron therein.

The pressing and forming steps are as follows: the materials after being proportioned and mixed are put into a pre-designed mould, and are pressed and processed into a preset shape by a press, and the density of a material block is kept at 2.4g/cm ² ～2.8g/cm ² In the meantime. Therefore, the density of the powder after compression molding is increased, reducing gas generated in the material block in the reaction process is not easy to dissipate, and the thorough reduction reaction is facilitated.

The mixed materials are pressed into blocks, 21 oval through holes with long axes of 20-30 mm and short axes of 13-20 mm are formed in the obtained pressing blocks, the oval through holes are arranged along the axial direction of the material blocks and penetrate through the upper end face and the lower end face of the material blocks, four semicircular flow guide grooves for gas circulation and a circular convergence groove for gas alternating current convergence are formed in the two end faces, one end of each flow guide groove is located at the middle point of the side wall of the material block, and the other end of each flow guide groove converges in the convergence groove with the center of the end face of the material block as the circle center. The width of the flow guide groove is 20-30 mm and is consistent with the long axis of the oval through hole, the radius of the confluence groove is 10-25 mm, and the same depth of the flow guide groove and the confluence groove is 2-20 mm. The thickness of the material block is between 80mm and 100 mm. The shape of the block includes, but is not limited to, a cylinder, a cuboid, a cube, a regular polygon prism, and preferably a cuboid herein. In addition, a spiral groove is carved inside the oval through hole.

The drying and reducing steps of the materials are as follows: load the material piece the utility model provides a pair of in car-type roaster, its main part is including having orbital platform truck, the last sealed petticoat pipe of platform truck and arranging the combustion system directly over the high temperature reduction section. The material blocks are stacked on the trolley to 800-1000 mm and then move forwards along the track at a preset speed until the material blocks move to a high-temperature reduction section, a large amount of high-temperature flue gas sprayed into the combustion chamber by the turbulent flow nozzle carries reformed coke oven gas entering from the second air inlet together, the high-temperature flue gas and the reformed coke oven gas flow into the smoke hood and penetrate through the whole material layer under the action of the exhaust fan, the material blocks are reduced gradually along with the movement of the trolley, and the reduced material blocks are discharged from the tail part of the trolley and enter a storage bin with micro-positive pressure reducing atmosphere.

The whole hearth is divided into two relatively independent parts by using the smoke hood, so that the material block is prevented from being directly heated at the first time, the reduction smoke after full reaction is controlled by a valve to enter the reaction chamber filled with the material block from the combustion chamber, the heat energy of the combustion chamber is close to the balance of the heat energy of the reaction chamber in the continuous reaction process, and the material block is provided with a through hole and a flow groove, so that the heating degree of each position of the material block is very close, and the temperature difference between the inside and the outside of the material block can be controlled within a reasonable range.

The retaining walls with opposite directions are respectively arranged in the side cavities at the two sides of the combustion chamber, so that the front impact of high-temperature reducing gas blown into the main cavity of the combustion chamber from the side cavities is avoided, and the phenomena of unsmooth discharge of flue gas in the combustion chamber, low combustion efficiency, formation of local high-temperature and low-temperature areas in the smoke hood, local over-burning and light burning of blocks and the like which are possibly caused by the positive impact are avoided.

The spoiler that sets up in the vortex nozzle can strengthen mixing between the gas and form the whirl, constantly the entrainment makes a small part reduction flue gas can flow back when high temperature reduction flue gas blowout, can to a great extent solve, spouts out the nozzle speed and unmatched the fire, the tempering problem that causes because of the gas, has improved the security and the stability of reaction process at the initial stage of the reaction because of the fuel gas.

As shown in fig. 1, the material blocks after being pressed and formed in the drying and reduction step are fed into a feeding bin 1 and then are fed onto a trolley 2 through the feeding bin 1, a smoke hood 3 is hermetically arranged on the trolley 2, and a combustion chamber 5 is arranged right above a high-temperature reduction section of the smoke hood 3. The barricade 16 of different orientation is installed to the side intracavity in the combustion chamber 5, and barricade 16's effect reduces the atmospheric pressure in 5 side chamber exits in the combustion chamber, is favorable to 5 main chambeies in the combustion chamber to burn the reaction and fully goes on, has improved combustion efficiency, can optimize the air current trend in combustion chamber 5 and the petticoat pipe 3 simultaneously, improves the homogeneity of material piece surface air current distribution and temperature, avoids the local phenomenon that produces light burning or overburning of material piece.

When the formal production is started, 70% of low-rank coal dust which is sieved and ground and passes through 200 meshes is sprayed from a coal dust injection pipe 18, high-temperature hot air output by a top combustion type hot blast stove is blown in from a primary air inlet pipe 19, and a small part of oxygen is blown in from an oxygen-enriched pipe 20 to support combustion according to the intensity of the combustion reaction. The generated coal gas is sprayed into the combustion chamber 5 by the turbulent burner 14 and is further mixed with the blast furnace gas sprayed by the secondary air inlet pipe 6 sufficiently, then the high-temperature flue gas is sprayed out from the outlet of the combustion chamber 5 and enters the smoke hood 3 with the material blocks, and the high-temperature flue gas passes through the tiled material layer under the action of negative pressure generated by the exhaust fan 11 at the bottom of the trolley 2, and then the material blocks are reduced. The trolley 2 filled with the material blocks advances along the center line of the roasting furnace at a certain speed and sequentially passes through the drying section, the preheating section and the reduction section until the whole process is completed.

Different from the symmetrical arrangement of the combustion chambers of the traditional roasting machine, the retaining walls 16 with different orientations are arranged in the side cavities of the combustion chambers 5 of the trolley-type roasting furnace, the front impact of high-temperature flue gas flow sprayed from the combustion chambers 5 and opposite air flow is avoided after the high-temperature flue gas flow leaves the nozzles of the combustion chambers 5, the air flow is fully developed, the back pressure at the outlets of the combustion chambers 5 is reduced, the full combustion reaction in the combustion chambers 5 is facilitated, and the combustion efficiency is improved. In addition, the high-temperature airflow sprayed out from the outlet of the combustion chamber 5 benefits from the arrangement of the retaining wall 16 to avoid the frontal impact in a narrow space, so that the airflow flow state is more reasonable, the high-temperature airflow can be uniformly filled in the whole smoke hood 3, the excessive burning and incomplete burning of the material block caused by the local high-temperature area and low-temperature area formed on the surface of the material layer are avoided, the overall reduction efficiency of the material layer is improved, and the product quality is improved.

As shown in fig. 2 to 4, a turbulent nozzle 14 is installed on a side wall of the chamber on the side of the combustion chamber 5. The main body of the turbulent flow nozzle 14 as a whole comprises a pulverized coal injection pipe 18, a burner 17, a nozzle brick 25, a primary air inlet pipe 19, an oxygen enrichment pipe 20 and a turbulator 23. Wherein the pulverized coal injection lance 18 is provided as an inlet section with a relatively small pipe diameter and as a flared section remote from said inlet section. In addition, a shunt pipe 26 which is distributed coaxially with the flared pipe section is arranged in the flared pipe section, at this time, an inner air duct 21 which can also be called as an inner annular flow passage is formed between the shunt pipe 26 and the combustor 17, and an outer annular flow passage 22 which can also be called as an outer annular flow passage is formed between the shunt pipe 26 and the flared pipe section. The vortex generators 23 with slightly different vortex angles are respectively arranged at the tail parts of the inner and outer annular flow channels. Meanwhile, an outer air duct 24 is formed between the flared section of the pulverized coal injection pipe 18 and the inner wall of the nozzle brick 25 into which the turbulent nozzle 14 is inserted, and the outer air duct 24 is communicated with the primary air inlet pipe 19 and the oxygen enrichment pipe 20.

After the reduction product comes out of the high-temperature reduction section, the reduction product is prevented from secondary oxidation under the protection of a trolley charge level sealing device 7, then the reduction product enters a storage bin 8 with a micro-positive pressure reduction atmosphere, one part of initial reduction charge is directly hot-charged into an electric arc furnace to be melted and used as a raw material for electric furnace steelmaking, the other part of initial reduction charge is subjected to magnetic separation twice and crushing screening once, obtained impurities and tailings mainly comprising carbon residue are returned to the storage bin 1 for recycling, and the obtained high-purity iron powder can be directly used for converter steelmaking.

In the whole reduction process, high-temperature reduction flue gas after reaction with a high-temperature reduction section material layer sequentially enters a preheating section and a drying section through a flue gas circulating system to preheat and dry the material block at the position, then the flue gas falls dust through a dust removal device 10 and is blown into a top combustion type hot air furnace together with air blown out by an air fan, and high-temperature hot air generated by the hot air furnace is blown into a turbulence nozzle through a primary air inlet pipe. The dust filtered by the dust removal device 10 is returned to the feed bin 1 as raw material for the briquettes. Therefore, the byproducts generated by the reaction are fully utilized, thereby achieving the purposes of saving energy, reducing cost and reducing emission.

As shown in fig. 5, the regular hexagonal grate 28 with the circular through holes is placed on the grate of the trolley-type roasting furnace, and the size of the regular hexagonal grate is sequentially reduced along the direction of the drying section, the preheating section and the high-temperature reduction section, so that the speed of the high-temperature flue gas extracted along the drying section, the preheating section and the high-temperature reduction section is gradually increased, and the pre-reaction of the material blocks of the drying section and the preheating section is more complete.

While the embodiments of the present invention have been described with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many modifications may be made by one skilled in the art without departing from the spirit and scope of the present invention as defined in the appended claims.

Claims (8)

1. A trolley type roasting reduction system, comprising: a trolley-type roasting machine, a top combustion hot blast stove, an electric arc furnace and dust removing equipment,

the trolley type roasting machine comprises a trolley, wherein a sealed smoke hood is arranged on the trolley, a conveying device is arranged in the smoke hood, the trolley comprises a drying section, a preheating section and a high-temperature reduction section which are sequentially arranged, and the high-temperature reduction section of the trolley is communicated with a sealing device and is communicated with a storage bin through the sealing device; two groups of combustion chambers which are arranged in parallel are arranged right above the smoke hood in the high-temperature reduction section of the trolley;

the sealing device is communicated with the electric arc furnace;

the top combustion hot blast stove is communicated with the combustion chamber and is communicated with the drying section of the trolley through dust removing equipment.

2. The trolley type roasting reduction system according to claim 1, wherein an exhaust fan is provided between the top-fired hot blast stove and the dust removing device.

3. The trolley type roasting reduction system according to claim 1, wherein wind boxes are provided between the drying section and the preheating section and between the preheating section and the high temperature reduction section.

4. The bogie-type roasting reduction system according to claim 1, wherein a secondary air intake pipe is provided to the combustion chamber.

5. The trolley type roasting reduction system according to claim 1, wherein retaining walls are provided in opposite directions in both side chambers in the combustion chamber, and each side chamber is provided with turbulence nozzles inserted into the nozzle blocks.

6. The trolley type roasting reduction system according to claim 5, wherein the turbulent flow nozzle as a whole comprises a pulverized coal injection pipe, a burner coaxially arranged with the pulverized coal injection pipe, a primary air inlet pipe, an oxygen-rich pipe and a spoiler.

7. The trolley type roasting reduction system according to claim 1, wherein the trolley type roasting machine places regular hexagonal grates on the grates, which are distributed with circular through holes, and the sizes of the regular hexagonal grates become smaller in order along the directions of the drying section, the preheating section, and the high temperature reduction section.

8. The trolley type roasting reduction system according to claim 1, wherein the top combustion stove is communicated with an air blower.

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