A double cold ring calcination system

Abstract

The utility model provides a kind of double cold ring type baking system, rack adopts annular structure, trolley is sequentially passed each process section on rack, preheating section, baking section, soaking section and one cold section adopt integral furnace cover, 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 furnace cover is passed into drum drying section.The hot air extracted from baking section and soaking section is directly sent into the furnace cover of preheating section on one hand, can directly preheat pellet, supplement a part of hot air before baking section, keep the air volume balance in integral furnace cover, on the other hand, can be sent into the furnace cover of dry extraction section.Independent furnace cover is used in other process section.Cooling section is divided into two sections, the hot air from furnace cover goes to two process sections respectively, hot air is used in stages, reduce heat waste.In addition, combustor is installed on the side wall of furnace cover in baking section, and the heat loss is small.The 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 double cold 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 these, the belt roaster pelletizing process offers advantages such as uniform roasting and good raw material adaptability, but it has high investment costs and is suitable for large-scale projects (typically exceeding 2 million tons / year), making it unsuitable for small and medium-sized production. This hinders the adoption of advanced pelletizing processes by small and medium-sized enterprises. The vertical shaft furnace pelletizing process has low production capacity and high energy consumption, representing outdated capacity, and its construction and application are restricted by policy, resulting in a pellet supply gap. The chain grate-rotary kiln pelletizing process is a combined unit process where pellet drying, preheating, roasting, and cooling are completed on multiple separate pieces of equipment. However, this process involves long circuits, difficult control, fluctuating product quality, limited raw material adaptability, and high investment costs, making it suitable only for large-scale production; its application on small and medium-sized scales is uneconomical. Utility Model Content

[0004] The purpose of this invention is to provide a dual-cold-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.

[0005] To solve the above-mentioned technical problems, this utility model provides a dual-cooling-ring roasting system, including a frame, several furnace hoods, a trolley, a wind box, a regenerating air unit, a cooling air unit, a forced-dry air unit, a main exhaust unit, an exhaust 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 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, 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 second cooling section 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 and the overall furnace hood through the reheat air unit, respectively. The air boxes of the desiccation section and the preheating section are connected to the main exhaust air unit. The air boxes of the first cooling section and the second cooling section are both connected to the cooling air unit.

[0011] The hot air duct interface connected to the regenerated air unit is located above the preheating section of the overall furnace hood, and a windbreak wall is provided between the heat equalization section and the first cold section;

[0012] A burner is installed on the side wall of the furnace hood in the roasting section.

[0013] Optionally, in the above-mentioned dual-cooling-ring calcination system, the number of burners is multiple.

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

[0015] Optionally, in the above-mentioned dual-cooling-ring roasting system, the cross-section of the integral furnace hood gradually increases along the running direction.

[0016] Optionally, in the above-mentioned dual-cooling-ring 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 dual-cooling-ring roasting system, the interfaces of each furnace hood are all located at the top of the furnace hood.

[0019] Optionally, in the above-mentioned dual-cooling-ring roasting system, the regenerating air unit is connected to the furnace hood of the drying section through a drying air supply pipe, and the regenerating air unit is connected to the overall furnace hood through a preheating air pipe, with an electric butterfly valve connected in series on the preheating air pipe.

[0020] Optionally, in the above-mentioned double-cooling-ring 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 dual-cooling-ring roasting system, the regenerating air unit, the cooling air unit, the forced-drying air unit, the main exhaust unit, and the exhaust unit are all fans.

[0022] Optionally, in the above-mentioned dual-cooling-ring calcination system, the cooling air unit has one cooling motor, and the cooling motor is connected to the air box of the first cooling section and the second cooling section respectively through pipes.

[0023] Alternatively, the cooling air unit may have two cooling fans, each connected to the air box of the first cooling section and the second cooling section via a pipe.

[0024] This utility model provides a dual-cold-ring roasting system, the advantages of which are:

[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 adopt an integrated furnace hood design, allowing the hot air generated in the first cooling section to directly enter the roasting and soaking sections, reducing heat loss in the high-temperature zone. The hot air generated in the second cooling section furnace hood is introduced into the drying section for pellet drying. The hot air extracted from the roasting and soaking sections can be directly sent to the preheating section furnace hood through the reheating air unit to preheat the pellets and supplement the front section of the roasting section with some hot air, maintaining airflow balance within the overall furnace hood. Alternatively, it can be sent to the drying section furnace hood through the reheating air unit. Other process sections use independent furnace hoods for easy maintenance and independent parameter control. By dividing the cooling section into two sections, the hot air from the furnace hood is directed to the two process sections respectively, allowing for graded utilization of the hot air, reducing heat waste, and making hot air utilization more rational and energy-efficient. In addition, 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 1 A schematic diagram of a dual-cold-ring roasting system provided in an embodiment of this utility model;

[0029] Figure 2 A cross-sectional view of the furnace hood located at the windbreak wall, provided for an embodiment of this utility model;

[0030] Figure 3 This is a top view of a dual-cold-ring roasting system provided in an embodiment of the present invention.

[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 - Unloading section; IX - Trolley maintenance section; X - Fabric distribution section;

[0033] 100-Integral furnace hood;

[0034] 200 vehicles;

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

[0036] 410 - Air box; 420 - Regenerated air unit; 430 - Drainage air supply duct; 440 - Preheating air duct; 450 - Cooling air unit; 460 - Blowing air unit; 470 - Main exhaust unit; 480 - Exhaust unit;

[0037] 500-burner;

[0038] 600-Windbreak Wall;

[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 double-cold-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.

[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 1The present invention provides a double-cooling-ring roasting system, comprising: a frame, several furnace hoods, a trolley 200, a wind box 410, a regenerating air unit 420, a cooling air unit 450, a forced-dry air unit 460, a main exhaust unit 470, an exhaust air unit 480, 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, unloading section VIII, trolley maintenance section IX, and feeding section X. Among them, feeding section X 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 secondary cooling section VII, and the unloading section VIII. An integrated furnace cover 100 is connected between the preheating section III, the roasting section IV, the homogenizing section V, and the primary 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 of the second cooling section VII is connected to the air box 410 of the drying section I through the drying air unit 460; the furnace hood corresponding to the drying section I is connected to the exhaust unit 480; the air boxes 410 corresponding to the roasting section IV and the homogenizing section V are connected to the furnace hood of the desiccation section II and the overall furnace hood 100 respectively through the reheat air unit 420; the reheat air unit 420 is connected to the furnace hood of the desiccation section II through the desiccation supply air duct 430; and the reheat air unit 420 is connected to the overall furnace hood 100 through the preheating air duct 440. The air boxes 410 corresponding to the desiccation section II and the preheating section III are connected to the main exhaust unit 470; and the air boxes 410 of the first cooling section VI and the second cooling section VII are both connected to the cooling air unit 450.

[0050] The hot air duct interface connected to the reheating air unit 420 is located above the preheating section III of the overall furnace hood 100. A baffle wall 600 is provided between the heat equalization section V and the first cooling section VI, and the hot air inside the overall furnace hood 100 can flow from above the baffle wall 600.

[0051] Burners 500 are installed on the side wall of the furnace hood in calcination section IV. This design allows burners 500 to directly provide a high-temperature heat source to calcination section IV, achieving precise temperature control. Throughout the production process, 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 section I uses low-temperature hot air from the second cooling section VII to penetrate the material layer from bottom to top, initially removing the water adhering to the surface of the green balls and preventing the lower layer of material from becoming too wet during subsequent drying.

[0053] Drying Section II: Utilizing high-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 in this section is crucial to prevent the green pellets from bursting. Both the blast drying section I and the drying section II are drying sections.

[0054] Preheating Section III: In this stage, the green pellets are gradually heated to a higher temperature, and physical and chemical reactions begin to occur, such as the removal of water of crystallization, decomposition of carbonates, and initial oxidation and solidification.

[0055] Roasting Section IV: 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.

[0056] Homogenization 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. This allows the lower layer of material, which has not yet fully reacted in calcination section IV, to continue reacting, resulting in more uniform product quality. Typically, no additional heating is required. Preheating section III, calcination section IV, and homogenization section V are all high-temperature reaction sections; primary cooling section VI and secondary cooling section VII are cooling sections where the high-temperature material is gradually cooled.

[0057] The unloading section VIII, the trolley maintenance section IX, and the material feeding section X are auxiliary sections. In the unloading section VIII, the finished products that have been baked and cooled are unloaded from the trolley and sent to the finished product warehouse or the next process.

[0058] Section IX: Empty trolleys that have finished unloading move to this area for inspection, maintenance, or cooling in preparation for the next material feeding cycle.

[0059] Section X: The pellets, green pellets or other raw materials to be processed are evenly distributed onto the trolley to form a uniform material layer, thereby ensuring continuous production in subsequent roasting.

[0060] The aforementioned regenerating air unit 420, cooling air unit 450, forced drying air unit 460, main exhaust unit 470, and exhaust unit 480 all belong to the hot air system, which can provide cooling air, hot air recycling, and exhaust gas purification before discharge.

[0061] This utility model provides a double-cooling ring-type roasting system. The frame adopts a ring structure to provide support for 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. Among them, the preheating section III, roasting section IV, homogenizing section V, and first cooling section VI adopt an integrated furnace hood 100 design, so that the hot air generated by the first cooling section VI can directly enter the roasting section IV and homogenizing section V, reducing heat loss in the high-temperature zone. The hot air generated by the second cooling section VII furnace hood is introduced into the drying section I for pellet drying. The hot air extracted from the roasting section IV and homogenizing section V can be directly sent to the furnace hood of the preheating section III through the reheating air unit 420 to directly preheat the pellets and supplement the hot air in front of the roasting section IV to maintain the air volume balance within the integrated furnace hood 100. On the other hand, it can be sent to the furnace hood of the extraction drying section II through the reheating air unit 420. Other process sections adopt independent furnace hoods for easy maintenance and independent parameter control.

[0062] By dividing the cooling section into two parts, the hot air coming out of the furnace hood is directed to two different process sections, allowing for graded utilization of the hot air, reducing heat waste, and making the use of hot air more rational and energy-efficient.

[0063] In addition, the burner 500 is directly installed on the side wall of the furnace hood of the roasting section IV, eliminating the need for a dedicated combustion chamber. Furthermore, since the burner 500 burns inside the furnace hood, heat loss is minimal.

[0064] 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.

[0065] Specifically, the regenerating air unit 420, cooling air unit 450, forced-drying air unit 460, main exhaust unit 470, and exhaust unit 480 are all fans. The cooling fan draws air from the atmosphere and sends it into the air boxes 410 of the first cooling section VI and the second cooling section VII to cool the roasted pellets. The cooling air from the second cooling section VII is sent to the forced-drying section I via the forced-drying air unit 460 for preliminary drying of the pellets. The exhaust gas from the forced-drying section I is discharged through the exhaust unit 480. The high-temperature flue gas from the roasting section IV and the homogenizing section V is sent to the furnace hood of the extraction section II and the overall furnace hood 100 respectively via the regenerating air unit 420 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 unit 470.

[0066] The cooling fan unit 450 can have one cooling fan, which is connected to the air box 410 of the first cooling section VI and the second cooling section VII through a pipe; or it can have two cooling fans, which are connected to the air box 410 of the first cooling section VI and the second cooling section VII through a pipe.

[0067] like Figure 3 As shown, the number of burners 500 can be one, two, or even more, depending on actual needs, and no further limitation is made 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 in pellet roasting.

[0068] Multiple burners 500 are respectively arranged opposite each other on both sides of the overall furnace shroud 100. Of course, the temperature of the burners 500 is adjustable to adapt to the temperature requirements of different roasting stages.

[0069] In a preferred embodiment, the cross-section of the integral furnace hood 100 gradually increases along the operating direction A of the annular calciner. The integral furnace hood 100 is connected to the four regions of preheating section III, calcining section IV, soaking section V, and first cooling section VI. The integral furnace hood 100 is separated from the soaking section V and the first cooling section VI near the lower region by a baffle wall 600, with a channel for hot air passage at the top, thereby preventing the hot air from the first cooling section furnace hood from flowing forward along the material surface. In particular, the cross-section gradually increases along the operating direction A of the annular calciner. This channel introduces low-temperature hot air at the small end of the integral furnace hood 100 (preheating section III on the left in the figure). This design creates a gradually expanding hot airflow field inside the furnace hood cavity, effectively reducing the high-temperature flue gas velocity, prolonging the residence time of the flue gas in the calcining area, and promoting sufficient heat exchange.

[0070] To improve the quality of flue gas emissions, a first dust removal device is installed between the furnace hood and the exhaust unit 480 corresponding to the drying section I. A second dust removal device is installed between the air box 410 and the main exhaust unit 470 corresponding to the drying section II and the preheating section III.

[0071] In a specific embodiment, the interfaces of each furnace hood are all located at the top of the furnace hood. The hot flue gas generated during the roasting process will naturally move upward. By placing the pipe interfaces at the top of the furnace hood, these high-temperature gases can be collected and guided very smoothly, effectively reducing the transport load of the blower.

[0072] The regenerating air unit 420 is connected to the furnace hood of the desiccation section II via the desiccation supply air duct 430, and the regenerating air unit 420 is connected to the overall furnace hood 100 via the preheating air duct 440. An electric butterfly valve is connected in series on the preheating air duct 440. The electric butterfly valve is used to control the air volume of hot air inside the overall furnace hood 100.

[0073] In one specific embodiment, such as Figure 1 As shown, a discharge trough 310 is installed below the discharge section VIII on the frame, where the trolley 200 tilts to discharge material. Below the discharge trough 310, a finished product conveyor belt 320 is installed, which finally transports the material to the finished product area.

[0074] Specifically, when the trolley 200 moves to the unloading section VIII, the trolley 200 rotates smoothly 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.

[0075] 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 pelleting projects. In its process method, all processes after green pellet feeding are completed on the ring roaster, namely, after the drying, desiccation, preheating, roasting, homogenization, and cooling processes, 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.

[0076] The specific process flow of this utility model includes:

[0077] First, in section X, ore pellets with an outer diameter greater than 11mm are laid onto trolley 200 with a thickness of 80mm-100mm.

[0078] 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 section IX. In drying section I and drying section II, the moisture of the green pellets is removed. In preheating section III, the pellet temperature is heated to prepare for roasting. In roasting section IV, an oxidation reaction occurs and the pellets solidify. In homogenization section V, the reaction and solidification continue. In the two cooling sections VI and VII, the temperature of the ore pellets is cooled to below 120℃. In unloading section VIII, the trolley 200 flips over and unloads the ore pellets into unloading trough 310, which is then transported out by finished product conveyor belt 320, thus completing the roasting process.

[0079] In this section, the hot air for preheating section III originates from the furnace hood of the first cold section and preheating air duct 440. The temperature range after the two types of hot air are mixed is 550℃-850℃. The hot air flow direction is shown below. Figure 1 Hot air at 900℃-1000℃ from the cold section furnace hood enters the roasting section furnace hood, and after being heated by the burner at 500℃, it reaches the hot air temperature of 1180℃-1280℃ required for roasting section IV.

[0080] The beneficial effects of the technical solution provided by this utility model include:

[0081] (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.

[0082] (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.

[0083] (3) The pellets are relatively stationary with respect to the trolley, resulting in a low pellet breakage rate.

[0084] (4) The preheating section III, roasting section IV, homogenizing section V and first cooling section VI adopt an integrated furnace hood design. The front end of the furnace hood is supplied with main air and the end end is supplied with preheating air duct, which can avoid insufficient air volume at the end of the integrated furnace hood.

[0085] (5) The cooling section is divided into two sections, which is simple in structure and easy to operate. The combustion chamber is eliminated, resulting in less equipment investment and less heat loss.

[0086] (6) The ring roasting system has a small footprint, low investment, and uniform pellet roasting, which gives it an advantage and broad market prospects for small and medium-sized pellet projects.

[0087] 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.

[0088] 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.

[0089] 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.

[0090] 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.

[0091] 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.

[0092] 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.

[0093] 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 dual-cold-ring calcination system, characterized in that, It includes a frame, several furnace hoods, a trolley (200), a wind box (410), a regenerating air unit (420), a cooling air unit (450), a forced dry air unit (460), a main exhaust unit (470), an exhaust unit (480), 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 unloading section (VIII), a trolley maintenance section (IX), and a feeding section (X). The feeding section (X) 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) and the unloading section (VIII) is equipped with an independent furnace hood, and the preheating section (III), the roasting section (IV), the homogenizing section (V) and the first cooling section (VI) are connected by an integral furnace hood (100). 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 second cooling section (VII) is connected to the wind box (410) of the drying section (I) through the drying air unit (460), the furnace hood of the drying section (I) is connected to the exhaust unit (480), the wind boxes (410) of the roasting section (IV) and the homogenizing section (V) are connected to the furnace hood of the desiccation section (II) and the overall furnace hood (100) respectively through the reheat air unit (420), the wind boxes (410) of the desiccation section (II) and the preheating section (III) are connected to the main exhaust unit (470), and the wind boxes (410) of the first cooling section (VI) and the second cooling section (VII) are both connected to the cooling air unit (450). The hot air duct interface connected to the regenerating air unit (420) is opened above the preheating section (III) of the integral furnace hood (100), and a windbreak wall (600) is provided between the heat equalization section (V) and the first cold section (VI). A burner (500) is provided on the side wall of the furnace hood of the roasting section (IV).

2. The dual-cold-ring calcination system according to claim 1, characterized in that, The number of burners (500) is multiple.

3. The dual-cold-ring calcination system according to claim 2, characterized in that, Multiple burners (500) are respectively disposed on both sides of the integral furnace shroud (100).

4. The dual-cold-ring calcination system according to claim 1, characterized in that, The cross-section of the integral furnace hood (100) gradually increases along the running direction.

5. The dual-cold-ring calcination 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 (480); 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 (470).

6. The dual-cold-ring calcination 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 dual-cold-ring calcination system according to claim 1, characterized in that, The regenerating air unit (420) is connected to the furnace hood of the desiccation section (II) through the desiccation air supply pipe (430), and the regenerating air unit (420) is connected to the overall furnace hood (100) through the preheating air pipe (440). An electric butterfly valve is connected in series on the preheating air pipe (440).

8. The dual-cold-ring calcination system according to claim 1, characterized in that, The frame is provided with a discharge trough (310) below the discharge section (VIII), and a finished product conveyor belt machine (320) is provided below the discharge trough (310).

9. The dual-cold-ring calcination system according to claim 1, characterized in that, The regenerating air unit (420), the cooling air unit (450), the blowing air unit (460), the main exhaust unit (470), and the exhaust unit (480) are all motors.

10. The dual-cold-ring calcination system according to claim 9, characterized in that, The cooling air unit (450) has one cooling motor, and the cooling motor is connected to the air box (410) of the first cooling section (VI) and the second cooling section (VII) through pipes respectively. Alternatively, the cooling air unit (450) may have two cooling fans, and the two cooling fans may be connected to the air boxes (410) of the first cooling section (VI) and the second cooling section (VII) respectively through a pipe.

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