Energy-saving pellet roasting device

Abstract

The utility model discloses an energy-saving pellet roasting device which comprises a roasting furnace, a heat exchanger, a waste gas purification tank and a roasting frame, a furnace cover is detachably arranged at the upper end of the roasting furnace, and a furnace bottom is detachably arranged at the lower end; a power device is arranged on the furnace cover, and a rotating seat located in the roasting furnace is rotationally arranged on the upper end face of the furnace bottom. The lower end of the roasting frame is located on the rotating seat, and the upper end is in transmission connection with the power device; the heat exchanger comprises a heat exchange shell and a spiral pipe, the spiral pipe is arranged in the heat exchange shell, one end of the spiral pipe penetrates through the heat exchange shell to communicate with the interior of the roasting furnace, and the other end penetrates through the heat exchange shell to communicate with the waste gas purification pond. The upper end of the heat exchange shell communicates with an air outlet of an air pump, and the lower end is provided with an air outlet pipeline communicating with the interior of the roasting furnace. According to the rotary roasting furnace, the detachable furnace bottom is arranged, the roasting furnace is convenient to clean, the rotary seat is arranged on the furnace bottom, the roasting frame is driven to rotate through the power device, and pellets can be roasted in a rotary mode.

Description

Technical Field

[0001] This utility model relates to the field of pellet roasting technology, specifically to an energy-saving pellet roasting device. Background Technology

[0002] In the production process of pellets, roasting is a key step. Its purpose is to obtain good physical and metallurgical properties of the pellets through high-temperature treatment. However, traditional pellet roasting equipment lacks a structure for effective treatment and recycling of waste gas, resulting in waste of heat energy. In addition, traditional pellet roasting equipment also has problems such as uneven heating of pellets during roasting and pellet fragments scattered in the roasting furnace.

[0003] In the prior art, utility model patent CN202322796630.1 discloses a pellet blast furnace roasting device, including a base, furnace body, heat exchange seat, heat exchange mechanism, purification box, purification mechanism, exhaust pipe, inlet pipe, and connecting pipe. The furnace body is set on the base, the heat exchange seat is set on the base, and multiple first support legs are set between the heat exchange seat and the base. The heat exchange mechanism is set in the heat exchange seat for recovering waste heat from the exhaust gas discharged from the furnace body. The purification box is set on the base, and multiple second support legs are set between the purification box and the base. The purification mechanism is set in the purification box for purifying the exhaust gas. The exhaust pipe is set on the furnace body and connected to the heat exchange seat to facilitate heat exchange through the heat exchange mechanism and purification of the exhaust gas through the purification mechanism, thereby solving the problems of low heat utilization and environmental pollution in related technologies.

[0004] The pellet roasting device provided by the aforementioned patent can treat and recycle the exhaust gas emitted from the furnace by setting up heat exchange and purification mechanisms. However, it still does not solve the problems of uneven heating during pellet roasting and the presence of pellet fragments scattered in the roasting furnace, which need further improvement. Utility Model Content

[0005] The purpose of this invention is to provide an energy-saving pellet roasting device, which aims to improve the problems of uneven heating of pellets and inconvenience in cleaning scattered pellet slag in the roasting furnace during the existing pellet roasting process.

[0006] This utility model is implemented as follows: An energy-saving pellet roasting device includes a roasting furnace, a heat exchanger, and a waste gas purification tank, as well as a roasting rack; the roasting furnace has a detachable furnace cover at its upper end and a detachable furnace bottom at its lower end; a power device is installed on the furnace cover, and a rotating seat located inside the roasting furnace is rotatably installed on the upper surface of the furnace bottom; the lower end of the roasting rack sits on the rotating seat, and its upper end is connected to the power device; the heat exchanger includes a heat exchange shell and a spiral tube, the spiral tube is located inside the heat exchange shell, with one end penetrating through the heat exchange shell to connect to the inside of the roasting furnace, and the other end penetrating through the heat exchange shell to connect to the waste gas purification tank; the upper end of the heat exchange shell is connected to the air outlet of a blower, and the lower end is provided with an air outlet pipe connecting to the inside of the roasting furnace.

[0007] Preferably, the rotating seat includes a support column and a rotating ring seat; multiple support columns are arranged sequentially along the circumference of the upper surface of the furnace bottom, and a fixed ring seat is fixedly arranged at the upper end of the multiple support columns. A number of steel balls are sequentially embedded in the upper surface of the fixed ring seat along the circumference. The rotating ring seat is fitted onto the fixed ring seat and is rotated by the steel balls. The lower end of the roasting rack is placed on the rotating ring seat.

[0008] Preferably, the roasting rack includes a placement tray, and multiple placement trays are arranged sequentially from top to bottom on the roasting rack. Multiple limiting rods are arranged sequentially along the circumferential direction on the outer ring side of the bottom placement tray. Limiting grooves are provided on the outer side of the rotating ring seat corresponding to the positions of the limiting rods, and the limiting rods are engaged in the limiting grooves.

[0009] Preferably, the power unit includes a motor, the upper surface of the furnace cover is provided with the motor, the output shaft of the motor extends through the furnace cover into the roasting furnace and is provided with a hexagonal clamp; the upper end of the roasting rack is provided with a hexagonal slot adapted to the hexagonal clamp, and the hexagonal clamp is adapted to be inserted into the hexagonal slot.

[0010] Preferably, the roasting furnace includes a heating tube and an exhaust pipe; the heating tube is spirally embedded inside the furnace body, and a temperature controller is provided on the outside of the roasting furnace, the temperature controller being electrically connected to the heating tube; an exhaust pipe communicating with the inside of the roasting furnace is provided on the side of the roasting furnace, the exhaust pipe being connected to one end of the spiral tube, and a pressure valve being provided on the exhaust pipe.

[0011] Preferably, it also includes a locking rod. Multiple connecting pins are arranged sequentially along the circumference of the outer side of the upper port of the roasting furnace. One end of the locking rod is rotatably connected to the connecting pin, and the other end is provided with a fixing bolt. The locking rod is fastened to the upper surface of the furnace cover by the fixing bolt.

[0012] Preferably, the furnace bottom includes an air inlet pipe and mounting bolts; multiple mounting bolts are sequentially arranged along the circumference of the furnace bottom, and the furnace bottom is installed at the bottom of the roasting furnace by the mounting bolts; an air inlet pipe is provided at the lower end of the furnace bottom, and the air inlet pipe is connected to an air outlet pipe.

[0013] Preferably, it also includes support legs, and multiple support legs are arranged sequentially along the circumference of the outer side of the roasting furnace.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. This utility model features a removable furnace bottom for easy cleaning of the roasting furnace. A rotating seat is installed on the upper surface of the furnace bottom, and the roasting rack is rotated by a power device, which allows the pellets to be roasted in a rotating manner, thus avoiding uneven heating during roasting.

[0016] 2. By setting up a heat exchanger and a waste gas purification tank, this utility model can treat and recycle the waste gas emitted from the roasting furnace, thus achieving energy-saving and environmental protection functions. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the connection structure of this utility model;

[0018] Figure 2 This is a cross-sectional structural diagram of the roasting furnace of this utility model;

[0019] Figure 3 This is a utility model Figure 2 Schematic diagram of the structure at point A;

[0020] Figure 4 This is a schematic diagram of the internal structure of the heat exchanger of this utility model;

[0021] Figure 5 This is a schematic diagram of the structure of the furnace bottom of this utility model;

[0022] Figure 6 This is a schematic diagram of the structure of the baking rack of this utility model;

[0023] Figure 7 This is a schematic diagram of the structure of the furnace cover of this utility model.

[0024] In the diagram: 1. Roasting furnace; 101. Heating tube; 102. Furnace cover; 103. Furnace bottom; 104. Support leg; 105. Exhaust pipe; 106. Pressure valve; 107. Inlet pipe; 108. Connecting pin; 109. Locking rod; 110. Fixing bolt; 111. Mounting bolt; 2. Heat exchanger; 201. Heat exchange shell; 202. Air pump; 203. Outlet pipe; 204. Spiral tube; 3. Waste gas purification tank; 4. Temperature controller; 5. Rotating seat; 501. Support column; 502. Fixing ring seat; 503. Steel ball; 504. Rotating ring seat; 505. Limiting slot; 6. Roasting rack; 601. Placement tray; 602. Limiting rod; 603. Hexagonal slot; 7. Power unit; 701. Motor; 702. Hexagonal clamp. Detailed implementation method:

[0025] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0026] The following description, in conjunction with the accompanying drawings and specific embodiments, provides further details:

[0027] Example 1

[0028] like Figure 1 and Figure 2 As shown, an energy-saving pellet roasting device includes a roasting furnace 1, a heat exchanger 2, and a waste gas purification tank 3, as well as a roasting rack 6. The roasting furnace 1 includes a heating tube 101 and an exhaust pipe 105. The heating tube 101 is spirally embedded inside the furnace body of the roasting furnace 1, and a temperature controller 4 is installed on the outside of the roasting furnace 1, electrically connected to the heating tube 101. Support legs 104 are also included, with multiple support legs 104 arranged sequentially along the circumference of the outside of the roasting furnace 1. The heating tube 101 uses resistance heating. The temperature controller 4 adjusts the current to achieve temperature control. The temperature controller 4 compares the actual temperature signal with the target temperature signal set by the user using a PID control algorithm, calculates the difference between the two, i.e., the temperature deviation, and then processes the temperature deviation according to a preset control algorithm. This allows the roasting furnace 1 to be heated.

[0029] like Figure 2 , Figure 3 and Figure 5As shown, the roasting furnace 1 has a detachable furnace cover 102 at its upper end and a detachable furnace bottom 103 at its lower end. It also includes a locking rod 109. Multiple connecting pins 108 are sequentially arranged along the circumference of the outer side of the upper port of the roasting furnace 1. One end of the locking rod 109 is rotatably connected to the connecting pin 108, and the other end is equipped with a fixing bolt 110. The locking rod 109 is secured to the upper surface of the furnace cover 102 by the fixing bolt 110. By rotating the locking rod 109 above the furnace cover 102 and then rotating the fixing bolt 110 to lock it onto the furnace cover 102, the furnace cover 102 can be secured. Disassembly only requires loosening the fixing bolt 110 to open the furnace cover 102. The furnace bottom 103 includes an air inlet pipe 107 and mounting bolts 111. Multiple mounting bolts 111 are sequentially arranged along the circumference of the furnace bottom 103, which is then installed at the bottom of the roasting furnace 1. A power unit 7 is installed on the furnace cover 102. A rotating seat 5, located inside the roasting furnace 1, is rotatably mounted on the upper surface of the furnace bottom 103. The lower end of the roasting rack 6 rests on the rotating seat 5, and its upper end is connected to the power unit 7. Installing the furnace bottom 103 with the mounting bolts 111 allows for easy disassembly during cleaning, facilitating the removal of slag from the roasting furnace 1. Simultaneously, the roasting rack 6, driven by the power unit 7, can rotate on the rotating seat 5, allowing it to rotate within the roasting furnace 1. This rotation enables the pellets on the roasting rack 6 to be roasted, preventing excessively high temperatures in certain areas and ensuring consistent roasting temperatures across different locations.

[0030] like Figures 5-7As shown, the rotating seat 5 includes a support column 501 and a rotating ring seat 504. Multiple support columns 501 are sequentially arranged along the circumference of the upper surface of the furnace bottom 103. A fixed ring seat 502 is fixedly installed at the upper end of each support column 501. Several steel balls 503 are sequentially embedded along the circumference of the upper surface of the fixed ring seat 502. The rotating ring seat 504 is fitted onto the fixed ring seat 502 and is rotatably mounted via the steel balls 503. The lower end of the roasting rack 6 rests on the rotating ring seat 504. Both the rotating ring seat 504 and the fixed ring seat 502 are hollow annular structures. The fixed ring seat 502 is supported by the support column 501, creating a gap at the lower end of the fixed ring seat 502. This allows for unobstructed airflow within the roasting furnace 1 and prevents the lower part of the roasting rack 6 from being enclosed, thus avoiding obstructed hot airflow. Simultaneously, the rotating ring seat 504 rotates on the fixed ring seat 502 via the steel ball 503, preventing the rotating ring seat 504 from rotating improperly. The roasting rack 6 includes a placement tray 601, with multiple layers of placement trays 601 arranged sequentially from top to bottom. Multiple limiting rods 602 are arranged sequentially along the circumference of the outer ring side of the bottom placement tray 601. Limiting grooves 505 are provided on the outer side of the rotating ring seat 504 corresponding to the positions of the limiting rods 602, and the limiting rods 602 are engaged in the limiting grooves 505. By setting the limiting rods 602, not only can they be positioned when placing the roasting rack 6, but they can also secure the roasting rack 6 to the rotating ring seat 504, preventing it from shifting or falling off during rotation. The power unit 7 includes a motor 701. The motor 701 is mounted on the upper surface of the furnace cover 102. The output shaft of the motor 701 extends through the furnace cover 102 and into the roasting furnace 1, where a hexagonal clamp 702 is located. The upper end of the roasting rack 6 is provided with a hexagonal slot 603 that is compatible with the hexagonal clamp 702, and the hexagonal clamp 702 is inserted into the hexagonal slot 603. When installing the furnace cover 102, the hexagonal clamp 702 in the power unit 7 on the furnace cover can be detachably connected to the upper end of the roasting rack 6, which can not only drive the roasting rack 6 to rotate, but also does not affect the opening of the furnace cover 102.

[0031] like Figure 1 , Figure 2 and Figure 6As shown, the heat exchanger 2 includes a heat exchange shell 201 and a spiral tube 204. The spiral tube 204 is disposed inside the heat exchange shell 201, with one end penetrating the heat exchange shell 201 and connecting to the interior of the roasting furnace 1, and the other end penetrating the heat exchange shell 201 and connecting to the waste gas purification tank 3. The upper end of the heat exchange shell 201 is connected to the air outlet of the air pump 202, and the lower end is provided with an air outlet pipe 203 connecting to the interior of the roasting furnace 1. An air inlet pipe 107 is provided at the lower end of the furnace bottom 103, and the air inlet pipe 107 is connected to the air outlet pipe 203. An exhaust pipe 105 is provided on the side of the roasting furnace 1, connecting to the interior of the roasting furnace 1. The exhaust pipe 105 is connected to one end of the spiral tube 204, and a pressure valve 106 is provided on the exhaust pipe 105. By installing a pressure valve 106 in the exhaust pipe 105, when the pressure inside the roasting furnace 1 reaches the pressure relief threshold of the pressure valve 106, the pressure valve 10 will be opened to exhaust gas. This ensures that exhaust gas is only released after the pressure inside the roasting furnace 1 reaches a certain level, thereby maintaining a stable temperature inside the roasting furnace 1. The exhaust gas is transported to the exhaust gas purification tank 3 through the spiral pipe 204. The exhaust gas purification tank 3 contains reagents for absorbing harmful substances, which can purify the exhaust gas before discharge. At the same time, as the exhaust gas passes through the spiral pipe 204, it also heats the air inside the heat exchange shell 201, and then transports it back into the roasting furnace 1 through the air pump 202 and the air inlet pipe 107 for reuse.

[0032] Example 2

[0033] like Figure 1 and Figure 2 As shown, an energy-saving pellet roasting device includes a roasting furnace 1, a heat exchanger 2, and a waste gas purification tank 3, as well as a roasting rack 6. The roasting furnace 1 includes a heating tube 101 and an exhaust pipe 105. The heating tube 101 is spirally embedded inside the furnace body of the roasting furnace 1, and a temperature controller 4 is provided on the outside of the roasting furnace 1. The temperature controller 4 is electrically connected to the heating tube 101. Additionally, it includes support legs 104, with multiple support legs 104 arranged sequentially along the circumference of the outside of the roasting furnace 1.

[0034] like Figure 2 , Figure 3 and Figure 5As shown, the roasting furnace 1 has a detachable furnace cover 102 at its upper end and a detachable furnace bottom 103 at its lower end. It also includes a locking rod 109. Multiple connecting pins 108 are sequentially arranged along the circumference of the outer side of the upper port of the roasting furnace 1. One end of the locking rod 109 is rotatably connected to the connecting pin 108, and the other end is provided with a fixing bolt 110. The locking rod 109 is secured to the upper surface of the furnace cover 102 by the fixing bolt 110. The furnace bottom 103 includes an air inlet pipe 107 and mounting bolts 111. Multiple mounting bolts 111 are sequentially arranged along the circumference of the furnace bottom 103, and the furnace bottom 103 is installed at the bottom of the roasting furnace 1 by the mounting bolts 111. A power unit 7 is installed on the furnace cover 102. A rotating seat 5 located inside the roasting furnace 1 is rotatably arranged on the upper surface of the furnace bottom 103. The lower end of the roasting rack 6 rests on the rotating seat 5, and its upper end is connected to the power unit 7 via a transmission connection.

[0035] like Figures 5-7 As shown, the rotating seat 5 includes support columns 501 and a rotating ring seat 504. Multiple support columns 501 are sequentially arranged along the circumference of the upper surface of the furnace bottom 103. A fixed ring seat 502 is fixedly installed at the upper end of each support column 501. Several steel balls 503 are sequentially embedded along the circumference of the upper surface of the fixed ring seat 502. The rotating ring seat 504 is fitted onto the fixed ring seat 502 and rotates via the steel balls 503. The lower end of the roasting rack 6 rests on the rotating ring seat 504. The roasting rack 6 includes a placement tray 601. Multiple placement trays 601 are sequentially arranged from top to bottom on the roasting rack 6. Multiple limiting rods 602 are sequentially arranged along the circumference of the outer ring side of the bottom placement tray 601. Limiting grooves 505 are provided on the outer side of the rotating ring seat 504 corresponding to the positions of the limiting rods 602, and the limiting rods 602 are engaged in the limiting grooves 505. The power unit 7 includes a motor 701. The motor 701 is installed on the upper surface of the furnace cover 102. The output shaft of the motor 701 extends through the furnace cover 102 and into the roasting furnace 1. A hexagonal clamp 702 is installed inside the furnace. The upper end of the roasting rack 6 is provided with a hexagonal slot 603 that is compatible with the hexagonal clamp 702. The hexagonal clamp 702 is inserted into the hexagonal slot 603.

[0036] like Figure 1 , Figure 2 and Figure 6As shown, the heat exchanger 2 includes a heat exchange shell 201 and a spiral tube 204. The spiral tube 204 is disposed inside the heat exchange shell 201, with one end penetrating the heat exchange shell 201 and connecting to the interior of the roasting furnace 1, and the other end penetrating the heat exchange shell 201 and connecting to the waste gas purification tank 3. The upper end of the heat exchange shell 201 is connected to the air outlet of the air pump 202, and the lower end is provided with an air outlet pipe 203 connecting to the interior of the roasting furnace 1. An air inlet pipe 107 is provided at the lower end of the furnace bottom 103, and the air inlet pipe 107 is connected to the air outlet pipe 203. An exhaust pipe 105 is provided on the side of the roasting furnace 1, connecting to the interior of the roasting furnace 1. The exhaust pipe 105 is connected to one end of the spiral tube 204, and a pressure valve 106 is provided on the exhaust pipe 105.

[0037] The working principle of this utility model is as follows: In use, the pellet ore is placed on the roasting rack 6, and then the roasting rack 6 is placed on the rotating ring seat 504. The limiting rod 602 at the bottom of the roasting rack 6 is locked by the limiting groove 505. Then, the furnace cover 102 is installed on the upper end of the roasting furnace 1, and the hexagonal clamp 702 is locked in the hexagonal groove 603 at the upper end of the roasting rack 6. Then, the furnace cover is locked by the locking rod 109 and the fixing bolt 110. The motor 701 can then be started to rotate, driving the roasting rack 6 to rotate. Then, the roasting temperature is set by the temperature controller 4 to roast the pellet ore. During the roasting process, when the pressure inside the roasting furnace 1 reaches the threshold of the pressure valve 106, the roasting furnace 1 will exhaust gas through the exhaust pipe 105 and transport it to the waste gas purification tank 3 through the spiral pipe 204 for purification and discharge. At the same time, as the waste gas passes through the spiral pipe 204, it will also heat the air inside the heat exchange shell 201 and transport it back into the roasting furnace 1 through the air pump 202 and the air inlet pipe 107 for reuse. When it is necessary to clean the inside of the roasting furnace 1, the furnace bottom 103 can be disassembled for cleaning.

[0038] In summary, this utility model, by providing a detachable furnace bottom 103, facilitates the cleaning of the roasting furnace 1. Simultaneously, a rotating seat 5 is provided on the upper surface of the furnace bottom 103, and the roasting rack 6 is rotated via a power device 7, allowing the pellets to be roasted in a rotating manner, thus avoiding uneven heating during roasting. Furthermore, by incorporating a heat exchanger 2 and a waste gas purification tank 3, the waste gas emitted from the roasting furnace 1 can be treated and recycled, achieving energy-saving and environmental protection functions.

[0039] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An energy-saving pellet induration device, comprising an induration furnace (1), a heat exchanger (2) and a waste gas purification tank (3), characterized in that, It also includes the roasting frame (6); the upper end of the roasting furnace (1) is detachably provided with a furnace cover (102), and the lower end is detachably provided with a furnace bottom (103); the furnace cover (102) is provided with a power device (7), and the upper end surface of the furnace bottom (103) is rotatably provided with a rotating seat (5) located inside the roasting furnace (1); the lower end of the roasting frame (6) is located on the rotating seat (5), and the upper end is in transmission connection with the power device (7); the heat exchanger (2) comprises a heat exchange shell (201) and a spiral pipe (204), the spiral pipe (204) is arranged in the heat exchange shell (201), and one end penetrates the heat exchange shell (201) to communicate with the inside of the roasting furnace (1), and the other end penetrates the heat exchange shell (201) to communicate with the waste gas purification tank (3); the upper end of the heat exchange shell (201) is communicated with the air outlet of the air pump (202), and the lower end is provided with an air outlet pipeline (203) communicated with the inside of the roasting furnace (1).

2. The energy saving type pellet induration apparatus according to claim 1, wherein The rotating seat (5) comprises a support column (501) and a rotating ring seat (504); the upper end surface of the furnace bottom (103) is sequentially provided with a plurality of support columns (501) along the circumferential direction thereof, a plurality of the support columns (501) are fixedly provided with a fixed ring seat (502) at the upper end thereof, the upper end surface of the fixed ring seat (502) is sequentially embedded with a plurality of steel balls (503) along the circumferential direction thereof, and the rotating ring seat (504) is sleeved on the fixed ring seat (502) and rotatably arranged through the steel balls (503); the lower end of the roasting frame (6) is arranged on the rotating ring seat (504).

3. The energy saving type pellet induration apparatus according to claim 2, wherein The roasting frame (6) comprises a placing disc (601), a plurality of placing discs (601) are sequentially arranged on the roasting frame (6) from top to bottom, a plurality of limiting clamping rods (602) are sequentially arranged on the outer ring side of the bottommost placing disc (601) along the circumferential direction thereof, the outer side of the rotating ring seat (504) is provided with a limiting clamping groove (505) corresponding to the position of each limiting clamping rod (602), and the limiting clamping rod (602) is clamped in the limiting clamping groove (505).

4. The energy efficient pellet induration device as claimed in claim 1, wherein, The power device (7) comprises a motor (701), the upper end surface of the furnace cover (102) is provided with a motor (701), the output shaft of the motor (701) extends to the inside of the roasting furnace (1) through the furnace cover (102) and is provided with a hexagonal chuck (702); the upper end of the roasting frame (6) is provided with a hexagonal clamping groove (603) matched with the hexagonal chuck (702), and the hexagonal chuck (702) is inserted into the hexagonal clamping groove (603).

5. The energy efficient pellet induration device as claimed in claim 1, wherein, The roasting furnace (1) comprises a heating pipe (101) and an exhaust pipe (105); the heating pipe (101) is spirally embedded in the inside of the furnace body of the roasting furnace (1), the temperature controller (4) is arranged on the outside of the roasting furnace (1), and the temperature controller (4) and the heating pipe (101) are electrically connected; the side of the roasting furnace (1) is provided with an exhaust pipe (105) communicated with the inside of the roasting furnace (1), one end of the exhaust pipe (105) is connected with the spiral pipe (204), and the exhaust pipe (105) is provided with a pressure valve (106).

6. The energy efficient pellet induration device as claimed in claim 1, wherein, Further comprising a lock rod (109), the upper end of the roasting furnace (1) is provided with a plurality of connecting pins (108) along its circumferential direction in turn, one end of the lock rod (109) is rotatably connected to the connecting pin (108), and the other end is provided with a fixing bolt (110), the lock rod (109) is buckled on the upper end face of the furnace cover (102) through the fixing bolt (110).

7. The energy efficient pellet induration device as claimed in claim 1, wherein, The furnace bottom (103) comprises an air inlet pipe (107) and a mounting bolt (111); a plurality of mounting bolts (111) are arranged on the furnace bottom (103) along its circumferential direction in turn, the furnace bottom (103) is mounted on the bottom of the roasting furnace (1) through the mounting bolt (111); the lower end of the furnace bottom (103) is provided with an air inlet pipe (107), and the air inlet pipe (107) is connected with an air outlet pipe (203).

8. The energy efficient pellet induration device as claimed in claim 1, wherein, Further comprising a support leg (104), the outer side of the roasting furnace (1) is provided with a plurality of support legs (104) along its circumferential direction in turn.

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