A furnace top heat supply type ring type baking system

Abstract

The utility model provides a kind of furnace top heat delivery formula ring type baking system, adopt annular working surface, cooling section is divided into four sections, hot air of furnace cover goes to four process sections respectively, hot air generated by one, two cold section furnace cover is used for pellet baking after heating in pipeline, hot air generated by three, four cold section furnace cover is used for the preheating and blast drying of pellet respectively, above-mentioned setting makes hot air utilization more fully reasonable, energy saving, heat distribution is uniform, prevent pellet green burning, overburning.Pellet drying, preheating, baking, cooling process are completed on one equipment, simple operation.Compared with belt type baking machine, pallet car is half, relatively low investment.The system has the characteristics of small floor area, uniform pellet baking, low investment cost, suitable for small and medium scale production.

Description

Technical Field

[0001] This utility model belongs to the technical field of ring roasting machines, and specifically relates to a furnace top heating ring roasting system. Background Technology

[0002] Iron pellets, as a raw material for blast furnaces and electric furnaces, have advantages over sintered ore, such as lower energy consumption and less pollution, making them a green and environmentally friendly ironmaking material. Increasing the proportion of iron pellets in the blast furnace smelting process is an effective way to achieve energy conservation and carbon reduction; therefore, as the proportion of iron pellets in the blast furnace continues to increase, its market demand also continues to grow.

[0003] Currently, the main production processes for pellets include belt roaster pelletizing, vertical shaft furnace pelletizing, and chain grate-rotary kiln pelletizing. Among them, the belt roaster pelletizing process has advantages such as uniform roasting and good raw material adaptability, but the investment cost is high, making it suitable for large-scale projects (usually with a scale of 2 million tons / year or more) and unsuitable for small and medium-sized production, making it difficult for small and medium-sized enterprises to adopt advanced pelletizing processes. The vertical shaft furnace pelletizing process has low production capacity and high energy consumption, and is considered outdated capacity, resulting in a pellet supply gap. The chain grate-rotary kiln pelletizing process is a combined unit process in which the drying, preheating, roasting, and cooling of pellets are completed on multiple pieces of equipment. However, this process has a long process flow, is difficult to control, product quality is prone to fluctuation, raw material adaptability is limited, and the investment cost is high, making it only suitable for large-scale production, and uneconomical for small and medium-sized applications. Utility Model Content

[0004] The purpose of this invention is to provide a top-heated ring roasting system, which features a small footprint, uniform pellet roasting, and low investment cost, making it suitable for small and medium-scale production.

[0005] To solve the above-mentioned technical problems, this utility model provides a furnace top heating type annular roasting system, including a frame, a furnace hood assembly, a rotary device and a wind box;

[0006] The frame adopts a ring structure, and the furnace hood assembly is installed above the frame to form a ring-shaped roasting space. The ring-shaped roasting space includes several process sections, which include, in sequence, a drying section, a preheating section, a roasting section, a homogenizing section, a first cooling section, a second cooling section, a third cooling section, a fourth cooling section, a unloading section, a trolley maintenance section, and a feeding section. The feeding section is used for laying pellets at the bottom and feeding green pellets. The furnace hood assembly is the first cooling section furnace hood, the second cooling section furnace hood, the third cooling section furnace hood, and the fourth cooling section furnace hood, respectively.

[0007] The rotary device includes a rotary body, a drive device, and a trolley. The rotary body is mounted on the frame, and the trolley is movably mounted on the rotary body. The drive device is used to drive the trolley to perform circular motion on the rotary body.

[0008] The air box is located at the bottom of the frame and is used for ventilation with the annular roasting space;

[0009] The furnace hood of the fourth cooling section is connected to the air box of the drying section through a drying air unit. The furnace hood corresponding to the drying section is used to discharge flue gas and purify it through the furnace hood air unit. The air boxes corresponding to the roasting section and the homogenizing section are connected to the furnace hood of the extraction section through a reheating air unit. The air boxes corresponding to the extraction section and the preheating section are used to discharge flue gas through the main extraction air unit. The furnace hood of the third cooling section is connected to the furnace hood of the preheating section. The furnace hood of the second cooling section is connected to the furnace hood of the roasting section through a first combustion system. The furnace hood of the first cooling section is connected to the furnace hood of the roasting section through a second combustion system. The air boxes of the first, second, third, and fourth cooling sections are all connected to the cooling air unit.

[0010] Optionally, in the above-mentioned top-heated annular roasting system, auxiliary burners are provided on the furnace hood of the preheating section and / or the roasting section.

[0011] Optionally, in the above-mentioned furnace top heating annular roasting system, there are multiple auxiliary burners, which are respectively arranged opposite to each other on the two side walls of the furnace hood of the preheating section and / or the roasting section.

[0012] Optionally, in the above-mentioned furnace top heating type annular roasting system, the interfaces of each furnace hood are all located at the top of the furnace hood. The second cooling section furnace hood is connected to the furnace hood of the roasting section through a first connecting pipe. The first cooling section furnace hood is connected to the furnace hood of the roasting section through a second connecting pipe. The third cooling section furnace hood is connected to the furnace hood of the preheating section through a third connecting pipe. The first connecting pipe, the second connecting pipe, and the third connecting pipe all span across the upper part of the frame.

[0013] Optionally, in the above-mentioned furnace top heating annular roasting system, the first combustion system is installed on the first connecting pipe, and the second combustion system is installed on the second connecting pipe.

[0014] Optionally, in the above-mentioned furnace top heating annular roasting system, a dust removal device is provided between the drying section and the furnace hood air unit, and / or between the air boxes corresponding to the drying section and the preheating section and the main exhaust unit.

[0015] Optionally, in the above-mentioned furnace top heating type annular roasting system, an annular conveyor belt is provided at the bottom of the wind box for conveying the broken balls falling from the wind box, and the annular conveyor belt has an upper sealing cover that is sealed to the wind box.

[0016] Optionally, in the above-mentioned furnace top heating type annular roasting system, the frame is provided with a discharge ore trough below the discharge section, and a finished product conveyor belt is provided below the discharge ore trough, with the finished product conveyor belt being connected to the outlet of the annular conveyor belt.

[0017] Optionally, in the above-mentioned furnace top heating type annular roasting system, two air outlets are provided at intervals on the top of the furnace hood of the roasting section. The two air outlets are respectively connected to the furnace hood of the second cooling section and the furnace hood of the first cooling section. The air outlet connected to the furnace hood of the second cooling section is closer to the preheating section side.

[0018] Optionally, in the above-mentioned furnace top heating annular roasting system, a bottom material silo and a roller distributor are provided above the material distribution section.

[0019] This utility model provides a furnace top heating type annular roasting system, the advantages of which are:

[0020] The system employs a ring-shaped working surface, with all processes completed on the ring-type roasting system. The cooling section is divided into four segments, with hot air from the furnace hood directed to each of the four process segments. Hot air from the first and second cooling sections is heated within pipes before being used for pellet roasting. Hot air from the third cooling section is used for pellet preheating, and hot air from the fourth cooling section is used for pellet forced-air drying. This configuration ensures more efficient and energy-saving hot air utilization, uniform heat distribution, and prevents under-burning and over-burning of the pellets. The preheating and roasting sections utilize top-of-furnace air supply technology to reduce hot air deviation within the furnace hood, ensuring uniform pellet roasting. Pellet drying, preheating, roasting, and cooling processes are all completed on a single machine, simplifying operation. Compared to belt roasters, it requires half the number of trolleys, resulting in lower investment costs. Therefore, this ring-type roasting system features a small footprint, uniform pellet roasting, and low investment costs, making it suitable for small to medium-scale production. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0022] Figure 1 A schematic diagram of a furnace top heating type annular roasting system provided for an embodiment of this utility model;

[0023] Figure 2 A cross-sectional view of the furnace hood provided in an embodiment of this utility model;

[0024] Figure 3A cross-sectional view of combustion inside a pipeline provided in an embodiment of this utility model;

[0025] Figure 4 This is a top view of a furnace top heating ring roasting system provided in an embodiment of the present utility model.

[0026] In the image above:

[0027] I - Drying section; II - Squeezing section; III - Preheating section; IV - Calcination section; V - Soaking section; VI - First cooling section; VII - Second cooling section; VIII - Third cooling section; IX - Fourth cooling section; X - Unloading section; XI - Trolley maintenance section; XII - Fabric distribution section;

[0028] 100 - Furnace hood assembly; 110 - First cooling section furnace hood; 120 - Second cooling section furnace hood; 130 - Third cooling section furnace hood; 140 - Fourth cooling section furnace hood;

[0029] 210 - Rotating body; 220 - Drive unit; 230 - Cart;

[0030] 310 - Unloading ore bin; 320 - Circular conveyor belt; 330 - Finished product conveyor belt; 340 - Bottom material bin; 350 - Roller distributor;

[0031] 400 - Wind box; 410 - Regenerating air unit; 420 - Furnace hood air unit; 430 - Main exhaust unit; 440 - Cooling air unit; 450 - Blowing dry air unit;

[0032] 510 - First combustion system; 520 - Second combustion system; 530 - Auxiliary burner;

[0033] a-Combustion air; b-Gas gas; c-Hot air; d-Pellet; e-Exhaust gas; Arrows indicate the direction of medium flow. Detailed Implementation

[0034] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0035] The core of this utility model is to provide a furnace top heating type ring roasting system, which has the characteristics of small footprint, uniform pellet roasting, and low investment cost, and is suitable for small and medium-scale production.

[0036] To enable those skilled in the art to better understand the technical solutions provided by this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0037] For details, please refer to Figure 1 The present invention provides a furnace top heating type ring roasting system, including: a frame, a furnace hood assembly 100, a rotary device and a wind box 400.

[0038] like Figure 4 As shown, the frame adopts a ring structure, serving as the supporting skeleton for the entire roasting machine. The ring-type roasting system forms a ring-shaped roasting space.

[0039] The annular roasting space comprises several process sections, which are arranged sequentially as follows: drying section I, drying section II, preheating section III, roasting section IV, homogenizing section V, first cooling section VI, second cooling section VII, third cooling section VIII, fourth cooling section IX, unloading section X, trolley maintenance section XI, and feeding section XII. Among them, feeding section XII is used for laying pellets at the bottom and feeding green pellets.

[0040] The furnace hood assembly 100 is installed over each process section, and the furnace hoods of each process section are separated by partition walls, forming multiple independent roasting spaces. The furnace hood assembly 100 is 110 for the first cooling section VI, 120 for the second cooling section VII, 130 for the third cooling section VIII, and 140 for the fourth cooling section IX, respectively. Specifically, the drying section I utilizes low-temperature hot air from the fourth cooling section IX to penetrate the material layer from bottom to top, initially removing the adhering water on the surface of the green pellets to prevent the lower layer of material from becoming too wet during subsequent drying. The desiccation section II utilizes higher-temperature hot air (from the roasting section IV and the homogenizing section V) to penetrate the material layer from top to bottom, further evaporating the molecularly bound water inside the green pellets to complete the drying process. Temperature control in this section is crucial to prevent the green pellets from bursting. Sections I and II are both drying sections; Section III is the preheating section: green pellets are gradually heated to a higher temperature in this stage, and physicochemical reactions begin to occur, such as the removal of water of crystallization, decomposition of carbonates, and initial oxidation and consolidation. Section IV is the roasting section: the material undergoes oxidation-reduction, crystallization-recrystallization, and other reactions at the highest temperature, achieving high-temperature consolidation of the material and obtaining the final metallurgical properties and mechanical strength. Section V is the homogenization section: utilizing the heat storage of the material layer itself, the lower part of the material that has not yet fully reacted in section IV continues to complete the reaction, making the product quality more uniform, and usually no additional heating is required. Sections III, IV, and V are all high-temperature reaction sections; Sections VI, VII, VIII, and IX are cooling sections, where the high-temperature material is gradually cooled down; Section X, XI, and XII are auxiliary sections. In section X, the finished product after roasting and cooling is unloaded from the trolley and sent to the finished product warehouse or the next process. Car Inspection Section XI: Empty car trolleys that have finished unloading move to this area for inspection, maintenance, or cooling, in preparation for the next feeding cycle. Feeding Section XII: The pellets, green pellets, or other raw materials to be processed are evenly distributed onto the car trolleys to form a uniformly thick material layer, thereby ensuring continuous production during subsequent roasting.

[0041] The rotary device includes a rotary body 210, a drive unit 220, and a trolley 230. The rotary body 210 is mounted on the frame, and the trolley 230 is movably mounted on the rotary body 210. The drive unit 220 drives the trolley 230 to perform circular motion on the rotary body 210. Since the roasting machine is ring-shaped, the trolleys 230 are designed to be connected end-to-end in a ring. The trolleys 230 are mounted on the rotary body 210 to form a ring-shaped working surface, and the drive unit 220 drives the trolleys 230 to perform circular motion at an adjustable speed.

[0042] The air box 400 is located at the bottom of the frame and is ventilated to the annular roasting space, thereby providing a controllable airflow channel to ensure that the airflow can pass through the material layer on the trolley 230 evenly and stably, thereby achieving precise transfer of heat energy and materials.

[0043] The furnace hood 140 of the fourth cooling section is connected to the wind box 400 of the drying section I through the drying air unit 450. The furnace hood corresponding to the drying section I is used to discharge flue gas and purify it through the furnace hood air unit 420. The wind boxes 400 corresponding to the roasting section IV and the soaking section V are connected to the furnace hood of the extraction section II through the reheating air unit 410. The wind boxes 400 corresponding to the extraction section II and the preheating section III are used to discharge flue gas through the main exhaust air unit 430. The furnace hood 130 of the third cooling section is connected to the furnace hood of the preheating section III. The furnace hood 120 of the second cooling section is connected to the first furnace hood of the roasting section IV through the first combustion system 510. The furnace hood 110 of the first cooling section is connected to the second furnace hood of the roasting section IV through the second combustion system 520. The wind boxes 400 of the first cooling section VI, the second cooling section VII, the third cooling section VIII and the fourth cooling section IX are all connected to the cooling air unit 440.

[0044] The aforementioned regenerating air unit 410, furnace hood air unit 420, main exhaust air unit 430, cooling air unit 440, and forced drying air unit 450 belong to the hot air system, which can provide cooling air, hot air recycling, and exhaust gas purification before discharge. Specifically, the hot air from the first cooling section VI is heated by the second combustion system 520 and then sent to the furnace hood of the roasting section IV. The hot air inside the furnace hood passes through the material layer under the suction of the wind box 400, providing heat and oxygen for pellet roasting. Similarly, the hot air from the second cooling section VII is heated by the first combustion system 510 and then sent to the furnace hood of the roasting section IV for pellet roasting. The hot air from the third cooling section VIII is introduced into the furnace hood of the preheating section III, passes through the material layer, and enters the wind box to preheat the material layer, preparing for the roasting process. The hot air from the fourth cooling section IX is blown into the air box 400 of the drying section I through the drying air unit 450. The hot air enters from below the trolley 230, then passes through the material layer and enters the furnace hood. The flue gas coming out of the furnace hood is purified by the furnace hood air unit 420 and then discharged.

[0045] This utility model provides a top-heated annular roasting system with an annular working surface. All processes are completed on the annular roasting system. The cooling section is divided into four sections, with hot air from the furnace hood directed to each of the four process sections. Hot air from the first cooling section furnace hood 110 and the second cooling section furnace hood 120 is heated in the pipeline before being used for pellet roasting. Hot air from the third cooling section furnace hood 130 is used for pellet preheating, and hot air from the fourth cooling section furnace hood 140 is used for pellet forced-air drying. This configuration makes the utilization of hot air more efficient and energy-saving, ensuring uniform heat distribution and preventing under-burning and over-burning of the pellets. The preheating section III and the roasting section IV employ top-heating technology to reduce hot air deviation within the furnace hood, ensuring uniform pellet roasting. The drying, preheating, roasting, and cooling processes of the pellets are all completed on a single device, simplifying operation. Compared to a belt roaster, the number of trolleys is reduced by half, resulting in lower investment. Therefore, this ring-type roasting system has the characteristics of small footprint, uniform pellet roasting, and low investment cost, making it suitable for small and medium-scale production.

[0046] To further achieve uniform heating, auxiliary burners 530 are installed on the furnace hoods of preheating section III and / or calcination section IV. The auxiliary burners 530 can reheat the hot air inside the furnace hood, and their temperature is adjustable. In particular, when the auxiliary burners 530 are installed on the furnace hood of preheating section III, they create a reasonable temperature gradient with calcination section IV. The heating system adopts a heating mode of (first combustion system 510 and second combustion system 520) in the pipeline + auxiliary heating mode inside the furnace hood (auxiliary burners 530), ensuring uniform heating and preventing under-burning and over-burning of the pellets.

[0047] Specifically, the auxiliary burner 530 has two inlets and one outlet. The two inlets are supplied with combustion air a and gas b by two sets of pipes, respectively. Figure 2 and Figure 3 As shown. The number of auxiliary burners 530 can be one, two, or even more, depending on actual needs, and is not further limited here. Pellet d is laid on top of trolley 230. Hot air c from the top of the furnace hood enters the furnace hood, and flames are ejected from the outlets of the auxiliary burners 530 on the side wall to roast the pellet d. The exhaust gas e after combustion is discharged from the bottom air box 400 through trolley 230.

[0048] like Figure 4 As shown, there are multiple auxiliary burners 530, which are respectively arranged opposite to each other on the two side walls of the furnace hood of the preheating section III and / or the calcination section IV, ensuring uniform heating of the product and improving product quality.

[0049] All furnace hood interfaces are located at the top of the hood. The hot flue gas generated during roasting naturally rises. Positioning the pipe interfaces at the top of the hood allows for smooth collection and guidance of this high-temperature gas, effectively reducing the load on the blower. Simultaneously, the second cooling section hood 120 is connected to the hood of roasting section IV via a first connecting pipe, the first cooling section hood 110 is connected to the hood of roasting section IV via a second connecting pipe, and the third cooling section hood 130 is connected to the hood of preheating section III via a third connecting pipe. The first, second, and third connecting pipes all span the upper part of the frame, thus achieving the shortest path fluid transport. This not only reduces pressure loss but also allows for rapid response to changes in airflow and pressure requirements across different process sections, making the entire system control more precise and efficient.

[0050] The first combustion system 510 is installed on the first connecting pipe, and the second combustion system 520 is installed on the second connecting pipe. They are used to supplement the airflow in the heating pipe to accurately control the gas temperature entering the cooling section or returning to the heating section, thereby ensuring process stability.

[0051] To improve the dust removal effect of the exhaust, a dust removal device is installed between the blower section I and the furnace hood air unit 420, and / or between the air box 400 corresponding to the exhaust section II and the preheating section III and the main exhaust unit 430.

[0052] In one specific embodiment, such as Figure 1 As shown, a circular conveyor belt 320 is installed at the bottom of the bellows 400 to transport the broken balls falling from the bellows 400. The circular conveyor belt 320 has an upper sealing cover that is sealed to the bellows 400. The fully sealed design of the upper cover of the circular conveyor belt 320 will not cause secondary dust to the environment, and there is no problem of material spillage caused by misalignment of the limit switch; it can operate continuously and has high stability.

[0053] Based on the above specific embodiment, a discharge trough 310 is provided below the discharge section X on the frame, where the trolley 230 tilts to discharge material. A finished product conveyor belt 330 is located below the discharge trough 310, and the finished product conveyor belt 330 connects to the outlet of the circular conveyor belt 320. A discharge port is provided at the bottom of the air box 400, equipped with a double-layer ash discharge valve. During production, some broken balls accumulate in the air box 400 and are discharged onto the circular conveyor belt 320 via the double-layer ash discharge valve, then discharged onto the finished product conveyor belt 330 via the head wheel, and finally conveyed to the finished product area.

[0054] Specifically, when the trolley 230 moves to position X of the unloading section, the trolley 230 smoothly flips downwards through the cooperation of the trolley roller arm and the curved rail. The material balls that have been baked and cooled on the trolley 230 slide down under the action of gravity and onto the finished product conveyor belt 330 to achieve unloading.

[0055] In one specific embodiment, two air inlets are provided at intervals on the top of the furnace hood of the roasting section IV. The two air inlets are respectively connected to the furnace hood 120 of the second cooling section and the furnace hood 110 of the first cooling section. The air inlet connected to the furnace hood 120 of the second cooling section is closer to the side of the preheating section III, and the air inlet connected to the furnace hood 110 of the first cooling section is closer to the side of the homogenizing section V.

[0056] The furnace hoods of preheating section III and roasting section IV are designed with three air inlets at the top. Multi-point air supply reduces the circumferential movement of hot air, thereby reducing the influence of centrifugal force and achieving the purpose of uniform distribution of hot air inside the furnace hood.

[0057] Above the feeding section XII, there is a base material bin 340 and a roller feeder 350. The base material bin 340 lays a layer of base material and edge material on the trolley 230, and then the roller feeder 350 evenly distributes the green balls on the base material layer. This coordinated method ensures the flatness and uniformity of the material surface on the trolley, laying the foundation for the subsequent efficient firing process.

[0058] The ring roasting system adopted in this case has the advantages of uniform roasting, hot air circulation, small footprint, and relatively low investment. It can adapt to various iron concentrate pellets and solves the problems of long process lines and uneven roasting in small and medium-sized iron concentrate pellet projects. In its process method, all processes after green pellet feeding are completed on the ring roaster, that is, after the drying, desiccation, preheating, roasting, homogenization, and cooling process sections, the pellets are produced. In the unloading section, the pellets are unloaded into the unloading trough by a trolley tilting, and then the pellets are transported to the finished product area by a belt conveyor. This utility model aims to achieve the characteristics of being suitable for small and medium-sized production, having strong raw material adaptability, energy saving and environmental protection, and low investment cost. At the same time, by optimizing process parameters such as heat supply and hot air circulation, the stability of pellet quality and production efficiency are improved.

[0059] The specific process flow of this utility model includes:

[0060] First, in section XII, pellets with an outer diameter greater than 11mm are laid onto trolley 230 with a thickness of 80mm-100mm.

[0061] Subsequently, green pellets are distributed onto the ore pellets using a roller feeder 350, with the total thickness of the material layer adjustable between 380mm and 450mm. As the trolley 230 rotates to the right, the green pellets sequentially enter section IX. In drying section I and drying section II, the moisture in the green pellets is removed. In preheating section III, the pellets are heated to prepare for roasting. In roasting section IV, an oxidation reaction occurs, and the pellets solidify. In homogenization section V, further reaction and solidification occur. In the four cooling sections VI-IX, the temperature of the ore pellets is cooled to below 120℃. In unloading section X, the trolley 230 flips the pellets, unloading them into the unloading hopper 310, from where they are transported by the finished product conveyor belt 330, thus completing the roasting process.

[0062] The beneficial effects of the technical solution provided by this utility model include:

[0063] (1) The trolleys of the ring roasting system form a ring surface, with the trolleys connected end to end, and they make continuous circular rotation under the drive of the rotating body. The total length of the trolley is equal to the length of the radial circle in the ring roasting system, while the total length of the trolley of the belt roasting machine is twice the length of the roasting machine. Therefore, the number of trolleys in the ring roasting machine is relatively small. Since the trolleys are made of heat-resistant cast steel and account for a large proportion of the cost of the roasting machine equipment, the investment in the ring roasting system is relatively low.

[0064] (2) The drying, preheating, roasting and cooling processes in this case are all completed on the ring roasting system, which has a short process flow, simple operation and small footprint; while the chain grate machine-rotary kiln pelletizing process is completed on three devices: chain grate machine, rotary kiln and ring cooler, which has complex equipment and long process line.

[0065] (3) The pellets are relatively stationary with respect to the trolley, resulting in a low pellet breakage rate.

[0066] (4) Uniform heat and air volume. The hot air from the first and second cooling section furnace hoods is heated in the pipeline before being sent to the roasting section IV, avoiding over-burning of the pellets due to open flames or concentrated heat; the hot air from the third cooling section furnace hood is directly sent to the preheating section III; the auxiliary burner 530 can, on the one hand, generate the temperature gradient required by the process between the preheating section III and the roasting section IV, and on the other hand, it can supplement the heat of the hot air, ensuring the temperature and avoiding local overheating. The top of the furnace hoods of the preheating section III and the roasting section IV is designed with 3 air outlets. Multi-point air supply reduces the circumferential movement of the hot air, thereby reducing the influence of centrifugal force and achieving the purpose of uniform distribution of hot air in the furnace hood.

[0067] (5) The ring roasting system has a small footprint, low investment, and uniform pellet roasting, which has advantages and broad market prospects for small and medium-sized pellet projects.

[0068] In the description of this application, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0069] In the description of this application, "multiple" means two or more. If "first" or "second" is mentioned, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of the technical features indicated.

[0070] As indicated in this application and claims, unless the context clearly indicates otherwise, the words "a," "an," "a," and / or "the" are not specifically singular and may include the plural. Generally, the terms "comprising" and "including" only indicate the inclusion of expressly identified steps and elements, which do not constitute an exclusive list, and the method or apparatus may also include other steps or elements. An element defined by the phrase "comprising an..." does not exclude the presence of other identical elements in the process, method, product, or apparatus that includes the element.

[0071] In the description of the embodiments of this application, unless otherwise stated, " / " means "or", for example, A / B can mean A or B; "and / or" in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Furthermore, in the description of the embodiments of this application, "multiple" refers to two or more.

[0072] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0073] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0074] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A top-heated annular roasting system, characterized in that, Includes frame, furnace hood assembly (100), rotary device and bellows (400); The frame adopts a ring structure, and the furnace hood assembly (100) is installed above the frame to form a ring roasting space. The ring roasting space includes several process sections, which include the following sections arranged in sequence: drying section (I), drying section (II), preheating section (III), roasting section (IV), homogenizing section (V), first cooling section (VI), second cooling section (VII), third cooling section (VIII), fourth cooling section (IX), unloading section (X), trolley maintenance section (XI), and feeding section (XII). The feeding section (XII) is used for laying pellets at the bottom and feeding green pellets. The furnace hood assembly (100) in the first cooling section (VI), second cooling section (VII), third cooling section (VIII), and fourth cooling section (IX) are respectively the first cooling section furnace hood (110), the second cooling section furnace hood (120), the third cooling section furnace hood (130), and the fourth cooling section furnace hood (140). The rotary device includes a rotary body (210), a drive device (220), and a trolley (230). The rotary body (210) is mounted on the frame. The trolley (230) is movably mounted on the rotary body (210). The drive device (220) is used to drive the trolley (230) to perform circular motion on the rotary body (210). The air box (400) is located at the bottom of the frame and is used for ventilation with the annular roasting space; The furnace hood (140) of the fourth cooling section is connected to the wind box (400) of the drying section (I) via a forced-air drying unit (450). The furnace hood corresponding to the drying section (I) is used to discharge flue gas and purify it through the furnace hood air unit (420). The wind boxes (400) corresponding to the roasting section (IV) and the homogenizing section (V) are connected to the furnace hood of the desiccation section (II) via a reheating air unit (410). The wind boxes (400) corresponding to the desiccation section (II) and the preheating section (III) are used to discharge flue gas through the main exhaust unit (43). 0) Exhaust flue gas. The furnace hood (130) of the third cooling section is connected to the furnace hood of the preheating section (III). The furnace hood (120) of the second cooling section is connected to the furnace hood of the roasting section (IV) through the first combustion system (510). The furnace hood (110) of the first cooling section is connected to the furnace hood of the roasting section (IV) through the second combustion system (520). The wind boxes (400) of the first cooling section (VI), the second cooling section (VII), the third cooling section (VIII) and the fourth cooling section (IX) are all connected to the cooling air unit (440).

2. The furnace top heating type annular roasting system according to claim 1, characterized in that, The preheating section (III) and / or the roasting section (IV) are provided with auxiliary burners (530).

3. The furnace top heating type annular roasting system according to claim 2, characterized in that, The number of auxiliary burners (530) is multiple, and the multiple auxiliary burners (530) are respectively arranged opposite to each other on the two side walls of the furnace hood of the preheating section (III) and / or the roasting section (IV).

4. The furnace top heating type annular roasting system according to claim 1, characterized in that, The interfaces of each furnace hood are located on the top of the furnace hood. The second cooling section furnace hood (120) is connected to the furnace hood of the roasting section (IV) through the first connecting pipe. The first cooling section furnace hood (110) is connected to the furnace hood of the roasting section (IV) through the second connecting pipe. The third cooling section furnace hood (130) is connected to the furnace hood of the preheating section (III) through the third connecting pipe. The first connecting pipe, the second connecting pipe and the third connecting pipe all span across the upper part of the frame.

5. The furnace top heating type annular roasting system according to claim 4, characterized in that, The first combustion system (510) is installed on the first connecting pipe, and the second combustion system (520) is installed on the second connecting pipe.

6. The furnace top heating type annular roasting system according to claim 1, characterized in that, A dust removal device is provided between the drying section (I) and the furnace hood air unit (420), and / or between the air box (400) corresponding to the drying section (II) and the preheating section (III) and the main exhaust unit (430).

7. The furnace top heating type annular roasting system according to claim 1, characterized in that, The bottom of the bellows (400) is provided with a ring conveyor belt (320) for conveying the broken balls falling from the bellows (400). The ring conveyor belt (320) has an upper sealing cover that is sealed to the bellows (400).

8. The furnace top heating type annular roasting system according to claim 7, characterized in that, The frame is provided with a discharge trough (310) below the discharge section (X), and a finished product conveyor belt machine (330) is provided below the discharge trough (310). The finished product conveyor belt machine (330) is connected to the outlet of the annular conveyor belt machine (320).

9. The furnace top heating type annular roasting system according to claim 1, characterized in that, The top of the furnace hood of the roasting section (IV) is provided with two air inlets at intervals. The two air inlets are respectively connected to the furnace hood of the second cooling section (120) and the furnace hood of the first cooling section (110). The air inlet connected to the furnace hood of the second cooling section (120) is close to the side of the preheating section (III).

10. The furnace top heating type annular roasting system according to claim 1, characterized in that, Above the fabric section (XII) is a base material bin (340) and a roller fabric feeder (350).

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