Roof-in built burner type roasting system

Abstract

The utility model provides a kind of roaster built-in burner formula baking system, rack adopts annular structure, trolley is sequentially passed each process section on rack, wherein, preheating section, baking section, soaking section and one cold section adopt integral roaster, the hot air generated by one cold section can directly enter baking section and soaking section, reduce high-temperature zone heat loss.The hot air generated by two cold section roaster enters the roaster of preheating section, can directly preheat pellet, give baking section front section to supplement part hot air, keep the air volume balance in integral roaster.Other process section adopts independent roaster.The hot air generated by three cold section roaster is passed into drum drying section to blow dry pellet.By dividing cooling section into three sections, the hot air of roaster goes to three process sections respectively, hot air is utilized in stages, reduce heat waste.Burner is directly installed on the side wall of the roaster of baking section, and heat loss is less.The annular baking system has the characteristics of small floor area, uniform pellet baking, low investment cost, and is suitable for small-scale production.

Description

Technical Field

[0001] This utility model belongs to the technical field of ring roasting machines, and specifically relates to a roasting system with a built-in burner in the furnace hood. 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 utility model is to provide a roasting system with a built-in burner in the furnace hood, which has the characteristics of small footprint, uniform pellet roasting, and low investment cost, and is suitable for small and medium-scale production.

[0005] To solve the above-mentioned technical problems, this utility model provides a roasting system with a built-in burner in the furnace hood, including a frame, several furnace hoods, a trolley, a wind box, a cooling air unit, a forced dry air unit, a main exhaust air unit, a regenerating air unit, an exhaust air unit, and a burner;

[0006] The frame adopts a ring structure, and several furnace covers are installed above the frame to form a ring roasting space. The ring 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 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.

[0007] Each of the drying section, the desiccation section, the second cooling section, the third cooling section, and the unloading section is equipped with an independent furnace hood, and the preheating section, the roasting section, the homogenizing section, and the first cooling section are connected by an integral furnace hood.

[0008] The trolley is used to perform circular motion on the frame;

[0009] The air box is located at the bottom of the frame and is used to ventilate the annular roasting space;

[0010] The furnace hood of the three cooling sections is connected to the air box of the drying section through the drying air unit; the furnace hood of the drying section is connected to the exhaust air unit; the air boxes of the roasting section and the homogenizing section are connected to the furnace hood of the desiccation section through the reheat air unit; the air boxes of the desiccation section and the preheating section are connected to the main exhaust air unit; the furnace hood of the second cooling section is connected to the overall furnace hood through the preheating air duct; and the air boxes of the first cooling section, the second cooling section, and the third cooling section are all connected to the cooling air unit.

[0011] The hot air duct interface connected to the preheating air duct is located above the preheating section of the overall furnace hood, and the lower parts of each process section of the overall furnace hood are interconnected.

[0012] Burners are installed on the furnace hood sidewall of the rear section of the preheating section III and the furnace hood sidewall of the roasting section.

[0013] Optionally, in the above-mentioned furnace hood-integrated burner type roasting system, the number of burners is multiple.

[0014] Optionally, in the above-mentioned furnace hood-integrated burner type roasting system, multiple burners are respectively arranged on both sides of the overall furnace hood.

[0015] Optionally, in the above-mentioned furnace hood-integrated burner type roasting system, the cross-section of the overall furnace hood gradually increases along the running direction.

[0016] Optionally, in the above-mentioned furnace hood built-in burner type roasting system, a first dust removal device is provided between the furnace hood corresponding to the drying section and the exhaust unit.

[0017] And / or, a second dust removal device is provided between the air boxes corresponding to the drying section and the preheating section and the main exhaust unit.

[0018] Optionally, in the above-mentioned furnace hood built-in burner type roasting system, the interface of each furnace hood is located at the top of the furnace hood.

[0019] Optionally, in the above-mentioned furnace hood-integrated burner type roasting system, the preheating air duct spans across the upper part of the frame.

[0020] Optionally, in the above-mentioned furnace hood built-in burner type 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.

[0021] Optionally, in the above-mentioned furnace hood-integrated burner-type roasting system, the cooling air unit, the forced drying air unit, the main exhaust air unit, the regenerating air unit, and the exhaust air unit are all fans.

[0022] Optionally, in the above-mentioned furnace hood built-in burner type roasting system, the cooling air unit has one cooling fan, and the cooling fan is connected to the air box of the first cooling section, the second cooling section and the third cooling section through three cooling pipes respectively.

[0023] Alternatively, the cooling air unit may have three cooling fans, and the three cooling fans may be connected to the air boxes of the first cooling section, the second cooling section, and the third cooling section respectively through a cooling pipe.

[0024] This utility model provides a roasting system with a built-in burner in the furnace hood, which has the following advantages:

[0025] The frame adopts a ring structure to provide support for the system. The trolley runs continuously on the frame, passing through each process section in sequence. All processes are completed on the ring-type roasting system. The preheating section, roasting section, soaking section, and first cooling section use an integrated furnace hood design, allowing hot air generated in the first cooling section to directly enter the roasting and soaking sections, reducing heat loss in the high-temperature zone. Hot air generated in the second cooling section furnace hood directly enters the preheating section furnace hood, directly preheating the pellets and supplementing the front section of the roasting section with some hot air, maintaining airflow balance within the overall furnace hood. Other process sections use independent furnace hoods for easy maintenance and independent parameter control. Hot air generated in the third cooling section furnace hood is introduced into the drying section for pellet drying. By dividing the cooling section into three sections, the hot air from the furnace hood is directed to the three process sections respectively, achieving graded utilization of hot air, reducing heat waste, and making hot air utilization more rational and energy-efficient. Furthermore, the burner is directly installed on the side wall of the furnace hood in the roasting section, eliminating the need for a dedicated combustion chamber, and because the burner burns inside the furnace hood, heat loss is minimal.

[0026] The drying, preheating, roasting, and cooling processes of the pellets are all completed on a single machine, making operation simple. Compared to a belt roaster, it requires half the number of trolleys, resulting in relatively lower investment. Therefore, this ring 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

[0027] 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.

[0028] Figure 1A schematic diagram of a furnace hood-integrated burner type roasting system provided for an embodiment of this utility model;

[0029] Figure 2 A cross-sectional view of the furnace hood provided in an embodiment of this utility model;

[0030] Figure 3 A top view of a furnace hood-integrated burner type roasting system provided for an embodiment of this utility model.

[0031] In the image above:

[0032] 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 - Unloading section; X - Trolley maintenance section; XI - Material distribution section;

[0033] 110 - Integral furnace hood; 120 - Second cooling section furnace hood; 130 - Third cooling section furnace hood;

[0034] 200 vehicles;

[0035] 310 - Unloading ore bin; 320 - Finished product conveyor belt machine;

[0036] 410 - Air box; 420 - Preheated air duct; 430 - Cooling air unit; 440 - Blowing dry air unit; 450 - Main exhaust unit; 460 - Regenerated air unit; 470 - Exhaust unit;

[0037] 500-burner;

[0038] a-Combustion air; b-Fuel gas; c-Hot air; d-Pelletizing material; e-Exhaust gas; Arrows indicate the direction of medium flow;

[0039] A - Direction of movement. Detailed Implementation

[0040] 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.

[0041] The core of this utility model is to provide a roasting system with a built-in burner in the furnace hood, which has the characteristics of small footprint, uniform pellet roasting, and low investment cost, and is suitable for small and medium-scale production.

[0042] 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.

[0043] For details, please refer to Figure 1 The present invention provides a furnace hood built-in burner type roasting system, including: a frame, several furnace hoods, a trolley 200, a wind box 410, a cooling air unit 430, a forced dry air unit 440, a main exhaust unit 450, a reheat air unit 460, an exhaust unit 470, and a burner 500.

[0044] like Figure 3 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.

[0045] 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, unloading section IX, trolley maintenance section X, and feeding section XI. Among them, feeding section XI is used for laying pellets at the bottom and feeding green pellets.

[0046] Several furnace covers are installed above the frame. Independent furnace covers are installed on the drying section I, the desiccation section II, the second cooling section VII, the third cooling section VIII, and the unloading section IX. An integrated furnace cover 110 is connected between the preheating section III, the roasting section IV, the homogenizing section V, and the first cooling section VI. This design ensures the temperature stability of the high-temperature zone and facilitates independent control of the low-temperature zone.

[0047] Because the roasting machine is ring-shaped, the trolleys 200 are connected end to end to form a ring-shaped working surface, which is used to make circular motion on the frame. The speed is adjustable to realize continuous material processing. All processes are completed on the ring-shaped roasting machine.

[0048] The air box 410 is located at the bottom of the frame and is used to ventilate the annular roasting space, thereby providing a controllable airflow channel to ensure that the airflow can pass through the material layer on the trolley 200 evenly and stably, thereby achieving precise transfer of heat energy and materials.

[0049] The hot air circulation path of the system is as follows: the furnace hood 130 of the third cooling section is connected to the air box 410 of the drying section I through the drying air unit 440; the furnace hood corresponding to the drying section I is connected to the exhaust air unit 470; the air box 410 corresponding to the roasting section IV and the homogenizing section V is connected to the furnace hood of the desiccation section II through the reheat air unit 460; the air box 410 corresponding to the desiccation section II and the preheating section III is connected to the main exhaust air unit 450; the furnace hood 120 of the second cooling section is connected to the overall furnace hood 110 through the preheating air duct 420; and the air boxes 410 of the first cooling section VI, the second cooling section VII, and the third cooling section VIII are all connected to the cooling air unit 430.

[0050] The hot air duct interface connected to the preheating air duct 420 is located above the preheating section III of the overall furnace cover 110, and the lower parts of each process section of the overall furnace cover 110 are interconnected.

[0051] Burners 500 are installed on the side walls of the furnace hood in the rear section of preheating section III and the side walls of the furnace hood in calcination section IV. This design allows the burners 500 to directly provide a high-temperature heat source to calcination section IV, achieving precise temperature control. Throughout the production process, the burners 500 inside the furnace hood provide heat to the hot air in preheating section III and calcination section IV, while the hot air system provides cooling air and recycles the hot air.

[0052] It should be noted that the drying stages are as follows: **Drying Section I:** Utilizing low-temperature hot air from the cooling section VIII, this air penetrates the material layer from bottom to top, initially removing the surface water of the green pellets to prevent excessive moisture in the lower layers during subsequent drying. **Drying Section II:** Utilizing higher-temperature hot air from the roasting section IV and the homogenizing section V, this air penetrates the material layer from top to bottom, further evaporating the molecularly bound water inside the green pellets to complete the drying process. Temperature control is crucial in this stage to prevent the green pellets from bursting. Both drying stages I and II are drying sections. **Preheating Section III:** In this stage, the green pellets are gradually heated to a higher temperature, initiating physicochemical reactions such as the removal of crystal water and the decomposition of carbonates, as well as initial oxidation and consolidation. **Roasting Section IV:** At the highest temperature, the material undergoes oxidation-reduction, crystallization-recrystallization, and other reactions, achieving high-temperature consolidation and obtaining the final metallurgical properties and mechanical strength. **Homogenizing Section V:** Utilizing the heat storage of the material layer itself, the pellets are kept at a high temperature for a period of time, allowing for sufficient heat conduction to improve pellet strength. The lower layer of material in roasting section IV, which has not yet fully reacted, continues to react, resulting in a more uniform product quality. This process typically requires no additional heating. Preheating section III, roasting section IV, and homogenizing section V are all high-temperature reaction sections. Cooling sections VI, VII, and VIII are cooling sections where the high-temperature material is gradually cooled. Unloading section IX, trolley maintenance section X, and material distribution section XI are auxiliary sections. Unloading section IX: The roasted and cooled finished product is unloaded from the trolley and sent to the finished product warehouse or the next process. Trolley maintenance section X: Empty trolleys that have completed unloading move to this area for inspection, maintenance, or cooling, preparing for the next material distribution cycle. Material distribution section XI: The pellets, green pellets, or other raw materials to be processed are evenly distributed onto the trolley to form a uniformly thick material layer, ensuring continuous production during subsequent roasting.

[0053] The aforementioned cooling air unit 430, drying air unit 440, main exhaust air unit 450, regenerating hot air unit 460, and exhaust air unit 470 belong to the hot air system, which can provide cooling air, hot air recycling, and exhaust gas purification before discharge.

[0054] This utility model provides a furnace hood-integrated burner-type roasting system. The frame adopts a ring structure to support the system. The trolley 200 runs continuously on the frame, passing through each process section in sequence. All processes are completed on the ring-type roasting system. The preheating section III, roasting section IV, soaking section V, and first cooling section VI are designed with an integrated furnace hood 110. This allows the hot air generated in the first cooling section VI to directly enter the roasting section IV and soaking section V, reducing heat loss in the high-temperature zone. The hot air generated in the second cooling section furnace hood 120 directly enters the furnace hood of the preheating section III, directly preheating the pellets and supplementing the front section of the roasting section IV with some hot air, maintaining airflow balance within the integrated furnace hood 110. Other process sections use independent furnace hoods for easy maintenance and independent parameter control. The hot air generated in the third cooling section furnace hood 130 is introduced into the drying section I for pellet drying. By dividing the cooling section into three sections, the hot air from the furnace hood is directed to the three process sections respectively, achieving graded utilization of the hot air, reducing heat waste, and making hot air utilization more rational and energy-efficient. In addition, the burner 500 is directly installed on the side wall of the furnace hood in the rear section of preheating section III and calcination section IV, without the need for a dedicated combustion chamber, and because the burner 500 burns inside the furnace hood, heat loss is minimal.

[0055] The drying, preheating, roasting, and cooling processes of the pellets are all completed on a single machine, making operation simple. Compared to a belt roaster, it requires half the number of trolleys, resulting in relatively lower investment. Therefore, this ring roasting system features a small footprint, uniform pellet roasting, and low investment costs, making it suitable for small to medium-scale production.

[0056] Specifically, the cooling air unit 430, the forced-drying air unit 440, the main exhaust air unit 450, the regenerating air unit 460, and the exhaust air unit 470 are all fans. The cooling fans draw air from the atmosphere and send it into the air boxes 410 of the first cooling section VI, the second cooling section VII, and the third cooling section VIII to cool the roasted pellets. The cooling air from the third cooling section VIII is sent to the forced-drying section I via the forced-drying air unit 440 for preliminary drying of the pellets. The exhaust gas from the forced-drying section I is discharged through the exhaust air unit 470. The high-temperature flue gas from the roasting section IV and the homogenizing section V is sent to the extraction section II via the regenerating air unit 460 for further drying of the pellets. The exhaust gas from the extraction section II and the preheating section III is discharged through the main exhaust air unit 450. The medium-temperature exhaust gas from the second cooling section VII is sent to the preheating section III of the integrated furnace hood 110 via the preheating air duct 420 for preheating the pellets.

[0057] like Figure 2As shown, the burner 500 has two inlets and one outlet. The two inlets are supplied with combustion air a and fuel gas b by two sets of pipes, respectively. The number of burners 500 can be one, two, or even more, depending on actual needs, and is not further limited here. When multiple burners 500 are used, the air temperature can be controlled in sections, resulting in uniform heat distribution, high flexibility in temperature control, and prevention of heat concentration, thus ensuring high-quality pellet roasting. Pellet d is laid on top of the trolley 200. Hot air c from the top of the furnace hood enters the furnace hood, and flames are ejected from the outlets of the burners 500 on the side walls to roast the pellet d. The exhaust gas e after combustion is discharged from the bottom air box 410 through the trolley 200.

[0058] like Figure 3 As shown, multiple burners 500 are respectively arranged opposite to each other on both sides of the overall furnace shroud 110. Specifically, multiple burners 500 with low combustion power can be used, and they can be arranged alternately on the inner and outer walls of the annular furnace shroud. Of course, the position of the burners 500 is adjustable to adapt to the temperature requirements of different roasting stages.

[0059] The low power of burner 500 prevents the flame from burning too long onto the opposite furnace wall, thus avoiding heat concentration and overheating of the green balls. The large number of burners 500 allows for greater flexibility in temperature control within the furnace hood. The relatively uniform arrangement of the burners 500 ensures even heat distribution within the furnace hood.

[0060] In a preferred embodiment, the cross-section of the integral furnace hood 110 gradually increases along the operating direction A of the annular roaster. The integral furnace hood 110 is connected to the four regions: preheating section III, roasting section IV, soaking section V, and first cooling section VI. Specifically, the cross-section gradually increases along the operating direction A of the annular roaster. High-temperature hot air is introduced into the larger end of the integral furnace hood 110 (first cooling section VI on the right side of the figure), and low-temperature hot air is introduced into the smaller end of the integral furnace hood 110 (preheating section III on the left side of the figure). From the larger end to the smaller end, the cross-section of the integral furnace hood 110 gradually decreases. This design creates a gradually expanding hot airflow field inside the furnace hood cavity, effectively reducing the high-temperature flue gas velocity, extending the residence time of the flue gas in the roasting area, and promoting sufficient heat exchange.

[0061] To improve the quality of flue gas emissions, a first dust removal device is installed between the furnace hood and the exhaust unit 470 corresponding to the drying section I. A second dust removal device is installed between the air box 410 and the main exhaust unit 450 corresponding to the drying section II and the preheating section III.

[0062] In a specific embodiment, the interfaces of each furnace hood are located at the top of the hood. The hot flue gas generated during the roasting process 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 preheating air duct 420 spans the upper part of the annular roaster, achieving the shortest path for fluid transport. This not only reduces pressure loss but also allows for rapid response to changes in airflow and pressure requirements across different process stages, making the entire system control more precise and efficient.

[0063] In one specific embodiment, such as Figure 1 As shown, a discharge trough 310 is installed below the discharge section IX on the frame, where the trolley 200 tilts to discharge material. A finished product conveyor belt 320 is installed below the discharge trough 310, which finally transports the material to the finished product area.

[0064] Specifically, when the trolley 200 moves to the unloading section IX position, the trolley 200 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 200 slide down under the action of gravity and onto the finished product conveyor belt 320 to achieve unloading.

[0065] 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.

[0066] The specific process flow of this utility model includes:

[0067] First, in section XI, pellets with an outer diameter greater than 11mm are laid onto trolley 200 with a thickness of 80mm-100mm.

[0068] Subsequently, green pellets are placed on the ore pellets, with the total thickness of the material layer adjustable between 380mm and 450mm. As the trolley 200 rotates to the right, the green pellets sequentially enter sections I-IX. In drying section I and desiccation 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 three cooling sections VI-VIII, the temperature of the ore pellets is cooled to below 120℃. In unloading section IX, the trolley 200 flips over and unloads the ore pellets into the unloading trough 310, which is then transported out by the finished product conveyor belt 320, thus completing the roasting process.

[0069] The beneficial effects of the technical solution provided by this utility model include:

[0070] (1) The trolleys of the ring roasting system form a ring surface, with the trolleys connected end to end, and rotate continuously in a circle relative to the frame. The total length of the trolleys is equal to the length of the radial circle in the ring roasting system, while the total length of the trolleys 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.

[0071] (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.

[0072] (3) The pellets are relatively stationary with respect to the trolley, resulting in a low pellet breakage rate.

[0073] (4) The preheating section III, the roasting section IV, the homogenizing section V and the first cold section VI adopt an integrated furnace hood design. The main air supply at the large end of the furnace hood and the preheating air duct 420 supplementary air at the end can avoid insufficient air volume at the end of the integrated furnace hood.

[0074] (5) The cooling section is divided into 3 sections, and the hot air coming out is used in stages to reduce heat waste.

[0075] (6) The number of burners 500 is large and the power is small. The temperature control inside the furnace hood is highly flexible and avoids heat concentration.

[0076] (7) 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.

[0077] 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.

[0078] 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.

[0079] 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.

[0080] 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.

[0081] 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.

[0082] 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.

[0083] 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 roasting system with a built-in burner in the furnace hood, characterized in that, It includes a frame, several furnace covers, a trolley (200), a wind box (410), a cooling air unit (430), a forced dry air unit (440), a main exhaust unit (450), a regenerating air unit (460), an exhaust unit (470), and a burner (500). The frame adopts a ring structure, and several furnace covers are installed above the frame to form a ring roasting space. The ring roasting space includes several process sections, which include, in sequence, a drying section (I), a drying section (II), a preheating section (III), a roasting section (IV), a homogenizing section (V), a first cooling section (VI), a second cooling section (VII), a third cooling section (VIII), a unloading section (IX), a trolley maintenance section (X), and a feeding section (XI). The feeding section (XI) is used for laying pellets at the bottom and feeding green pellets. Each of the drying section (I), the desiccation section (II), the second cooling section (VII), the third cooling section (VIII) and the unloading section (IX) is equipped with an independent furnace hood, and an integral furnace hood (110) is provided between the preheating section (III), the roasting section (IV), the homogenizing section (V) and the first cooling section (VI). The trolley (200) is used to make circular motion on the frame; The air box (410) is located at the bottom of the frame and is used to ventilate the annular roasting space; The furnace hood of the third cooling section (VIII) is connected to the wind box (410) of the drying section (I) through the drying air unit (440), the furnace hood of the drying section (I) is connected to the exhaust unit (470), the wind box (410) of the roasting section (IV) and the homogenizing section (V) is connected to the furnace hood of the desiccation section (II) through the reheat air unit (460), the wind box (410) of the desiccation section (II) and the preheating section (III) is connected to the main exhaust unit (450), the furnace hood of the second cooling section (VII) is connected to the overall furnace hood (110) through the preheating air duct (420), and the wind boxes (410) of the first cooling section (VI), the second cooling section (VII) and the third cooling section (VIII) are all connected to the cooling air unit (430). The hot air duct interface connected to the preheating air duct (420) is located above the preheating section (III) of the integral furnace hood (110); Burners (500) are provided on the furnace hood sidewall of the preheating section (III) and the furnace hood sidewall of the roasting section (IV).

2. The furnace hood-integrated burner type roasting system according to claim 1, characterized in that, The number of burners (500) is multiple.

3. The furnace hood-integrated burner type roasting system according to claim 2, characterized in that, Multiple burners (500) are respectively disposed on both sides of the integral furnace shroud (110).

4. The furnace hood-integrated burner type roasting system according to claim 1, characterized in that, The cross-section of the integral furnace hood (110) gradually increases along the running direction.

5. The furnace hood-integrated burner type roasting system according to claim 1, characterized in that, A first dust removal device is provided between the furnace hood corresponding to the drying section (I) and the exhaust unit (470); And / or, a second dust removal device is provided between the air box (410) corresponding to the drying section (II) and the preheating section (III) and the main exhaust unit (450).

6. The furnace hood-integrated burner type roasting system according to claim 1, characterized in that, The interfaces of each furnace cover are located on the top of the furnace cover.

7. The furnace hood-integrated burner type roasting system according to claim 6, characterized in that, The preheating air duct (420) spans the upper part of the frame.

8. The furnace hood-integrated burner type roasting system according to claim 1, characterized in that, The frame is provided with a discharge trough (310) below the discharge section (IX), and a finished product conveyor belt machine (320) is provided below the discharge trough (310).

9. The furnace hood-integrated burner type roasting system according to claim 1, characterized in that, The cooling air unit (430), the drying air unit (440), the main exhaust air unit (450), the regenerating air unit (460), and the exhaust air unit (470) are all fans.

10. The furnace hood-integrated burner type roasting system according to claim 9, characterized in that, The cooling air unit (430) has one cooling fan, and the cooling fan is connected to the air box (410) of the first cooling section (VI), the second cooling section (VII) and the third cooling section (VIII) through three cooling pipes respectively. Alternatively, the cooling air unit (430) may have three cooling fans, and the three cooling fans may be connected to the air boxes (410) of the first cooling section (VI), the second cooling section (VII), and the third cooling section (VIII) respectively through a cooling pipe.

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