Combined rotary flash reaction furnace

Abstract

The invention relates to a reaction furnace in the field of metallurgy and chemical engineering, in particular to a combined rotary flash reaction furnace which comprises three sections of furnace barrels connected in series, the three sections of furnace barrels are respectively a heating furnace barrel, a reaction furnace barrel and a cooling furnace barrel which are sequentially arranged along the material flowing direction, and heating assemblies are respectively arranged outside the heating furnace barrel and the reaction furnace barrel. A cooling assembly is arranged outside the cooling furnace barrel; the ends of every two adjacent furnace barrels are arranged in a sleeved mode, every two adjacent furnace barrels are connected through a connector, the connector located between the heating furnace barrel and the reaction furnace barrel is provided with a heating waste gas recovery port and a reactant inlet, and the connector located between the reaction furnace barrel and the cooling furnace barrel is provided with a reaction waste gas recovery port and a coolant inlet. Through the series combination design of the three-section furnace barrel, the fluidization production of chemical reaction processing of solid materials is realized.

Description

Technical Field

[0001] This invention relates to the field of metallurgical and chemical reactors, specifically to a combined rotary flash reactor. Background Technology

[0002] Traditionally, high-temperature reaction equipment used in solid material processing is the rotary kiln. Existing rotary kilns have a simple structure, employing a single-stage furnace. Fuel (pulverized coal or gas) is injected from the furnace head and burned inside to heat the material. Heating and reaction occur in the same zone, leading to problems such as difficulty in temperature control, insufficient or excessive reaction, and reverse reactions. In particular, excessively high temperatures inside the furnace can cause solid materials to melt and adhere to the inner wall, forming rings that significantly shorten the service life of the rotary kiln. Insufficient, excessive, or reverse reactions all result in low energy efficiency, poor reaction results, and unstable product quality. Summary of the Invention

[0003] The purpose of this invention is to provide a combined rotary flash reactor, which, through a three-section furnace barrel series design, achieves functional zoning for heating, reaction, and cooling, making the material processing flow precise and controllable, thereby solving the defects mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: A combined rotary flash reactor includes three furnace sections connected in series. The three furnace sections are a heating furnace, a reaction furnace, and a cooling furnace, arranged sequentially along the material flow direction. Heating components are provided on the exterior of the heating furnace and the reaction furnace, respectively, and a cooling component is provided on the exterior of the cooling furnace. The ends of two adjacent furnace sections are nested together, and the two adjacent furnace sections are connected by a connector. The connector located between the heating furnace and the reaction furnace has a heating exhaust gas recovery port and a reactant inlet, and the connector located between the reaction furnace and the cooling furnace has a reaction exhaust gas recovery port and a coolant inlet.

[0005] As a further improvement, the furnace barrel is driven to rotate by a drive device, and the end of the furnace barrel is sleeved and connected to the connector.

[0006] As a further improvement, the heating assembly includes a burner disposed below the corresponding furnace barrel, the burner having a plurality of gas nozzles facing the bottom of the furnace barrel; the plurality of nozzles are evenly spaced on an arcuate surface, and the arcuate surface in which the plurality of nozzles are located is coaxially arranged with the furnace barrel.

[0007] As a further improvement, the cooling assembly includes a plurality of coolant nozzles disposed above the respective furnace barrels, and a coolant collector is provided below the furnace barrels.

[0008] As a further improvement, each of the three sections of the furnace barrel is provided with an insulation cover, and the heating component and the cooling component are respectively located inside the corresponding insulation cover.

[0009] As a further improvement, a lifting plate is fixedly installed inside the furnace barrel.

[0010] As a further improvement, the connector includes an annular connecting portion, one end of which is fixedly mounted with an end plate, and the end plate is provided with a mounting hole coaxially arranged with the connecting portion; one end of the furnace barrel located upstream of the connector is rotatably mounted in the mounting hole, and one end of the furnace barrel located downstream of the connector is rotatably mounted in the connecting portion; the heating exhaust gas recovery port, the reactant inlet, the reaction exhaust gas recovery port, and the coolant inlet are respectively provided on the corresponding end plates.

[0011] As a further improvement, the furnace barrel is cylindrical or conical. When the furnace barrel is conical, the small end of the furnace barrel is rotatably installed in the mounting hole, and the large end of the furnace barrel is rotatably installed in the connecting part.

[0012] Compared with the prior art, the beneficial effects of the present invention are: By using a three-section furnace barrel series combination design, fluidized production of solid materials through chemical reaction processing is achieved, significantly improving production efficiency; By setting multiple evenly distributed gas nozzles at the bottom of the heating furnace and reaction furnace, the heating area of ​​the furnace is increased, making the material heat up faster and more evenly, and significantly reducing energy consumption. By precisely controlling the heating and reaction temperatures of solid materials, and accurately dispensing solid materials and reactants, energy consumption and material waste are reduced. The modular design with heating, reaction, and cooling functional zones facilitates equipment maintenance and process adjustments for different chemical reactions, expands the equipment's application range, and enhances its adaptability to various types of chemical reactions. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention; Figure 2 yes Figure 1 An explosion diagram; Figure 3 This is a schematic diagram of the connector structure according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of the heating assembly according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the cooling assembly according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the reverse engineering plate according to an embodiment of the present invention.

[0015] In the diagram: 1-Heating furnace barrel; 2-Reaction furnace barrel; 3-Cooling furnace barrel; 4-Connector; 5-Connection part; 6-End plate; 7-Mounting hole; 8-Scraper plate; 9-Insulation cover; 10-Burner; 11-Gas nozzle; 12-Coolant nozzle; 13-Coolant collector; 14-Heating exhaust gas recovery port; 15-Reactant inlet; 16-Reaction exhaust gas recovery port; 17-Coolant inlet; 18-Recirculation pipe. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0017] like Figures 1 to 6 As shown, the combined rotary flash reactor includes three furnace sections connected in series. The furnace sections are arranged horizontally, and are arranged sequentially along the material flow direction as a heating furnace 1, a reaction furnace 2, and a cooling furnace 3. The end of the heating furnace 1 furthest from the reaction furnace 2 is the feed end, and the end of the cooling furnace 3 furthest from the reaction furnace 2 is the discharge end. The three furnace sections are coaxially arranged and inclined at 5-12 degrees, so that the feed end is slightly higher than the discharge end.

[0018] The ends of two adjacent furnace barrels are nested together. The furnace barrels are either cylindrical or conical. When the furnace barrels are cylindrical, the inner diameters of the heating furnace barrel 1, the reaction furnace barrel 2, and the cooling furnace barrel 3 increase sequentially. In this embodiment, the furnace barrels are conical, with the smaller end of the heating furnace barrel 1 nested inside the larger end of the reaction furnace barrel 2, and the smaller end of the reaction furnace barrel 2 nested inside the larger end of the cooling furnace barrel 3. Adjacent furnace barrels are connected by a connector 4, such as... Figure 2 and Figure 3As shown, connector 4 includes an annular connecting part 5, with an end plate 6 welded to one end of the connecting part 5, which closes one end of the connecting part 5. The end plate 6 has mounting holes 7 coaxially arranged with the connecting part 5. The small ends of the heating furnace barrel 1 and the reaction furnace barrel 2 are rotatably and sealingly connected to the mounting holes 7 of the corresponding connector 4. The large ends of the reaction furnace barrel 2 and the cooling furnace barrel 3 are rotatably and sealingly connected to the inner walls of the connecting parts 5 of the corresponding connector 4, allowing relative rotation between the furnace barrels and connector 4. The bottoms of the three furnace barrels are supported by rollers and driven to rotate by a drive device. Connector 4 is fixedly mounted on the frame.

[0019] In addition, arc-shaped lifting plates 8 are welded into the three sections of the furnace barrel, such as... Figure 6 As shown, multiple lifting plates 8 are evenly spaced around the circumference of the furnace barrel. When the furnace barrel rotates, the lifting plates 8 roll up the material and make a throwing motion inside the furnace barrel, so that the material moves continuously in the three furnace barrels and moves forward towards the discharge end. This allows the solid material to achieve different functional reactions in the three furnace barrels, while the entire material processing realizes fluidized production.

[0020] like Figure 1 and Figure 2 As shown, each of the three furnace sections is equipped with an insulation cover 9. The insulation cover 9 is fixedly installed on the frame and is U-shaped and inverted on the outside of the furnace to achieve the function of insulation.

[0021] Heating components are provided on the outside of the heating furnace barrel 1 and the outside of the reaction furnace barrel 2, and cooling components are provided on the outside of the cooling furnace barrel 3. The heating components and cooling components are respectively located inside the corresponding heat insulation cover 9.

[0022] like Figure 2 and Figure 4 As shown, the heating assembly includes a burner 10 disposed below the corresponding furnace barrel. Multiple gas nozzles 11 are arrayed on the top of the burner 10, facing the bottom of the furnace barrel. The multiple nozzles 11 are evenly spaced on an arc-shaped surface, which is coaxial with the furnace barrel. The distance between the gas nozzles 11 and the outer wall of the furnace barrel is maintained at 30-60 cm. A mixing chamber is provided inside the burner 10. After the gas and oxygen are fully mixed in the mixing chamber, they are ejected through the gas nozzles 11 and combusted to release heat. A temperature sensor is installed inside the furnace barrel. Based on the feedback from the temperature sensor, the heating temperature of the solid materials in the furnace body is precisely controlled by adjusting the number and position of the ignition of the gas nozzles 11.

[0023] like Figure 2 and Figure 5As shown, the cooling assembly includes multiple coolant nozzles 12 positioned above the cooling furnace tank 3, and a coolant collector 13 located below the cooling furnace tank 3. The coolant nozzles 12 are installed on the inner side of the top wall of the corresponding insulation cover 9. Coolant is sprayed from the nozzles 12 onto the outer wall of the cooling furnace tank 3, rapidly cooling the high-temperature solid material that has undergone chemical reaction inside the furnace tank 3 to below 200°C in an oxygen-free environment, preventing the high-temperature solid material from reacting with oxygen in the air and causing a reverse oxidation reaction. The sprayed coolant is collected by the coolant collector 13 below the cooling furnace tank 3. The coolant collector 13 is connected to an external heat exchange device and the multiple coolant nozzles 12 above the cooling furnace tank 3 via pipelines. After heat exchange, the coolant returns to the coolant nozzles 12 for recycling.

[0024] like Figure 2 As shown, the connector 4, located between the small end of the heating furnace barrel 1 and the large end of the reaction furnace barrel 2, has a heating exhaust gas recovery port 14 and a reactant inlet 15 on its end plate 6. The heating exhaust gas recovery port 14 and the reactant inlet 15 are located on the upper and lower sides of the corresponding mounting holes 7, respectively. The heating exhaust gas generated in the heating furnace barrel 1 is discharged and recovered in advance through the heating exhaust gas recovery port 14, avoiding interference of the heating exhaust gas with the reaction atmosphere in the reaction furnace barrel 2. At the same time, according to the different chemical reactions required by different solid materials, the required reactant (gas) (such as CO, H2, etc. required for the reduction reaction of iron ore powder) is introduced into the reaction furnace barrel 2 through the reactant inlet 15, which comes into full contact with the high-temperature solid material in the reaction furnace barrel 2 that has been heated to the target temperature (such as iron ore powder heated to 550-650℃), and a rapid chemical reaction is generated (the reaction is completed within 3-10 seconds), realizing the rapid, precise and controllable chemical reaction.

[0025] The connector 4, located between the small end of the reactor tank 2 and the large end of the cooling furnace tank 3, has a reaction waste gas recovery port 16 and a coolant inlet 17 on its end plate 6. The reaction waste gas recovery port 16 and the coolant inlet 17 are located on the upper and lower sides of the corresponding mounting holes 7, respectively. The reaction waste gas generated inside the reactor tank 2 is discharged and recovered in advance through the reaction waste gas recovery port 16, avoiding interference with the atmosphere inside the cooling furnace tank 3. Simultaneously, coolant (such as N2) is introduced into the cooling furnace tank 3 through the coolant inlet 17 to help rapidly cool the solid materials inside the cooling furnace tank 3. The heating waste gas recovery port 14 and the reaction waste gas recovery port 16 are respectively connected to exhaust valves.

[0026] Working principle: 1. Heating Stage: The solid material is first crushed into particles with a diameter of ≤3 mm or ground into powder with a diameter of ≥0.147 mm, and then enters the heating furnace barrel 1. The gas nozzle 11 at the bottom of the heating furnace barrel 1 ignites and heats the outer wall of the heating furnace barrel 1. The top of the insulation cover 9 on the outside of the heating furnace barrel 1 is connected to a return pipe 18. The end of the return pipe 18 away from the insulation cover 9 extends into the large end of the heating furnace barrel 1. The exhaust gas generated by the combustion of the gas nozzle 11 flows through the return pipe 18. The material flows back into the heating furnace barrel 1 to heat the solid material; the rotation of the heating furnace barrel 1 causes the material inside to tumble and move, and the solid material is continuously heated during the tumbling and moving of the heating furnace barrel 1. When the heating reaches the target temperature (for example, 550℃-650℃ for iron ore), the material in the heating furnace barrel 1 enters the reaction furnace barrel 2 through its small end connector 4; the heating exhaust gas generated in the heating furnace barrel 1 is discharged and recovered through the heating exhaust gas recovery port 14 on its small end connector 4.

[0027] 2. Reaction Stage: High-temperature solid material enters reactor 2 through connector 4 at the small end of heating furnace 1. Other reactants (such as CO, H2, etc.) enter reactor 2 through reactant inlet 15 on connector 4 at the small end of heating furnace 1. Inside reactor 2, the lifting plate 8 rolls up the high-temperature solid material (solid phase) and throws it, making full contact with the reactants (gas phase) during the process. The chemical reaction is completed in a flash (3-10 seconds). The solid material that has completed the chemical reaction continues to move forward and enters cooling furnace 3 through connector 4 at the small end of reactor 2. The reaction waste gas (such as CO2) generated in reactor 2 is discharged and recovered through reaction waste gas recovery port 16 on connector 4 at the small end of reactor 2.

[0028] During this reaction stage, a gas nozzle 11 is also pre-installed at the bottom of the reactor barrel 2 to keep the material inside the reactor barrel 2 at a high temperature for later use. If the solid material inside the reactor barrel 2 can maintain the minimum reaction temperature during this stage (e.g., iron ore not lower than 550°C), then ignition and heating are not required.

[0029] 3. Cooling Stage: The high-temperature solid material that has completed the chemical reaction enters the cooling tank 3 through the connector 4 at the small end of the reaction tank 2. The coolant nozzle 12 sprays coolant onto the outer wall of the cooling tank 3. The rotation of the cooling tank 3 causes the high-temperature material inside to cool down evenly. The flowing coolant is collected by the coolant collector 13. The coolant collector 13 is connected to the external heat exchange device and multiple coolant nozzles 12 above the cooling tank 3. The coolant circulates and carries away the heat of the solid material inside the cooling tank 3, quickly cooling the solid material. At the same time, coolant (such as N2) is introduced into the cooling tank 3 from the coolant inlet 17 on the connector 4 at the small end of the reaction tank 2 to help the solid material inside the cooling tank 3 cool down quickly. When the solid material inside the cooling tank 3 is cooled to below 200°C, it is discharged through the material outlet at the small end of the cooling tank 3. The cooling exhaust gas inside the cooling tank 3 is discharged and recovered through the exhaust gas recovery outlet at the small end of the cooling tank 3.

[0030] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A combined rotary flash reactor, characterized in that: The furnace includes three furnace sections connected in series. The three furnace sections are a heating furnace, a reaction furnace, and a cooling furnace, which are arranged sequentially along the material flow direction. Heating components are provided on the outside of the heating furnace and the reaction furnace, and a cooling component is provided on the outside of the cooling furnace. The ends of two adjacent furnace sections are nested together and connected by a connector. The connector between the heating furnace and the reaction furnace has a heating exhaust gas recovery port and a reactant inlet, and the connector between the reaction furnace and the cooling furnace has a reaction exhaust gas recovery port and a coolant inlet.

2. The combined rotary flash reactor as described in claim 1, characterized in that: The furnace barrel is driven to rotate by a drive device, and the end of the furnace barrel is sleeved and connected to the connector.

3. The combined rotary flash reactor as described in claim 1, characterized in that: The heating assembly includes a burner disposed below the corresponding furnace barrel, the burner having a plurality of gas nozzles facing the bottom of the furnace barrel; the plurality of nozzles are evenly spaced on an arc-shaped surface, and the arc-shaped surface where the plurality of nozzles are located is coaxially arranged with the furnace barrel.

4. The combined rotary flash reactor as described in claim 1, characterized in that: The cooling assembly includes a plurality of coolant nozzles disposed above the respective furnace barrels, and a coolant collector disposed below the furnace barrels.

5. The combined rotary flash reactor as described in claim 1, characterized in that: The three sections of the furnace barrel are each equipped with an insulation cover, and the heating component and the cooling component are respectively located inside the corresponding insulation cover.

6. The combined rotary flash reactor as described in claim 1, characterized in that: A lifting plate is fixedly installed inside the furnace barrel.

7. The combined rotary flash reactor as described in claim 1, characterized in that: The connector includes an annular connecting portion, one end of which is fixedly mounted with an end plate. The end plate has a mounting hole coaxially arranged with the connecting portion. One end of the furnace barrel located upstream of the connector is rotatably mounted in the mounting hole, and one end of the furnace barrel located downstream of the connector is rotatably mounted in the connecting portion. The heating exhaust gas recovery port, the reactant inlet, the reaction exhaust gas recovery port, and the coolant inlet are respectively arranged on the corresponding end plates.

8. The combined rotary flash reactor as described in claim 7, characterized in that: The furnace barrel is cylindrical or conical. When the furnace barrel is conical, the small end of the furnace barrel is rotatably installed in the mounting hole, and the large end of the furnace barrel is rotatably installed in the connecting part.

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