Flue gas rotary kiln and gypsum board production system

Abstract

Provided are a flue gas rotary kiln and a gypsum board production system. The flue gas rotary kiln comprises: a first mounting frame (100) having a mounting cavity (110), a first opening (120), a second opening (130), an air outlet (140), and a pass-through opening (150) being formed in the cavity wall of the mounting cavity (110); a second mounting frame (200) located on the right side of the first mounting frame (100) and provided with a discharging port (210) and an air supply port (220); a cylinder (300), the left end of the cylinder being rotatably mounted in the mounting cavity (110) from the second opening (130), the right end of the cylinder being rotatably mounted on the second mounting frame (200), and the discharging port (210) and the air supply port (220) being both communicated with the right end of the cylinder (300); a first heat exchange pipe located in the cylinder (300) and connected to the cylinder (300); second heat exchange pipes (500) located in the cylinder (300) and connected to the cylinder (300), the right end of the first heat exchange pipe being communicated with the right ends of the second heat exchange pipes (500), and the left end of the first heat exchange pipe being rotatably mounted at the first opening (120); and a feeding pipe (600), a discharging end of the feeding pipe passing through the pass-through opening (150) and extending to a position between the first heat exchange pipe and the cylinder (300), and the second heat exchange pipes (500) being located on the right side of the feeding pipe (600).

Description

A flue gas rotary kiln and gypsum board production system

[0001] This application claims priority to the Chinese patent application filed with the Patent Office of China on December 1, 2023, with application number 202311638664.6 and invention name: A Flue Gas Rotary Kiln and Gypsum Board Production System, the contents of which should be understood as incorporated into this application by reference. Technical Field

[0002] The present application relates to the technical field of gypsum board production, and in particular to a flue gas rotary kiln and a gypsum board production system. Background Art

[0003] The two-step calcination process for gypsum often adopts a split design, that is, the first-step calcination equipment and the second-step calcination equipment are arranged separately, and the two are connected by a conveying device. This solution has the following problems:

[0004] 1) The structure is relatively complex;

[0005] 2) The power consumption of the conveying equipment is relatively large;

[0006] 3) When the conveying equipment is transporting materials, the heat lost by the materials is relatively large;

[0007] 4) The exhaust gas temperature of the one-step calcination equipment and the two-step calcination equipment is relatively high;

[0008] 5) One-step calcination equipment is severely corroded.

[0009] Summary of the Invention

[0010] The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the claims.

[0011] The flue gas rotary kiln provided in an embodiment of the present invention comprises: a first mounting frame having a mounting cavity, a cavity wall of the mounting cavity being provided with a first opening, a second opening, an air outlet and a through-hole, the first opening being located on the left side wall of the mounting cavity, and the second opening being located on the right side wall of the mounting cavity; a second mounting frame being located on the right side of the first mounting frame and being provided with a discharge port and an air supply port; a cylinder, the left end of which is rotatably mounted to the mounting cavity from the second opening, and the right end of which is rotatably mounted to the second mounting frame, and the discharge port and the air supply port are both connected to the right end of the cylinder; a first heat exchange pipe being located in the cylinder and connected to the cylinder; a second heat exchange pipe being located in the cylinder and connected to the cylinder, the first The right end of the heat exchange tube is connected to the right end of the second heat exchange tube, the left end of the first heat exchange tube is rotatably installed at the first opening, and is arranged to be connected to the smoke supply port of the smoke supply device; and a feed pipe is arranged to supply the second material, the discharge end of which passes through the penetration opening and extends between the first heat exchange tube and the cylinder, the second heat exchange tube is located on the right side of the feed pipe and is spaced apart from the feed pipe in the axial direction of the cylinder; wherein, a direct heat exchange zone is formed between the left end of the second heat exchange tube in the cylinder and the discharge end of the feed pipe, the direct heat exchange zone is connected with the air outlet through the installation cavity, and an indirect heat exchange zone is formed between the left end of the second heat exchange tube in the cylinder and the right end of the second heat exchange tube.

[0012] The gypsum board production system proposed in an embodiment of the present invention includes: the flue gas rotary kiln described in any of the above embodiments; a flue gas supply device, whose flue gas supply port is connected to the left end of the first heat exchange tube, and the flue gas supply device is configured to supply flue gas to the first heat exchange tube; a dust collecting device, which is connected to the air outlet and is configured to collect dust discharged from the air outlet; an air supply device, which is connected to the air supply port and is configured to supply an air beam to the air supply port; and a driving device, which is transmission-connected to the cylinder and is configured to drive the cylinder to rotate.

[0013] Still other aspects will become apparent upon reading and understanding the accompanying drawings and detailed description.

[0014] Summary of the Figures

[0015] FIG1 is a schematic cross-sectional view of the main structure of a smoke rotary kiln and a smoke supply device after assembly according to some embodiments of the present application;

[0016] Figures 2 and 3 are enlarged views of the local structure in Figure 1;

[0017] FIG4 is a schematic diagram of the AA cross-sectional structure in FIG1 , where the arrow indicates the direction of rotation of the cylinder;

[0018] FIG5 is a schematic diagram of the AA cross-sectional structure in FIG1 ;

[0019] FIG6 is a schematic diagram of the CC cross-sectional structure in FIG1 ;

[0020] FIG7 is a schematic cross-sectional view of the DD structure in FIG1 ;

[0021] FIG8 is a schematic diagram of the EE cross-sectional structure in FIG1 , where the arrow indicates the direction of rotation of the cylinder;

[0022] FIG9 is a partial schematic diagram of the cross-sectional structure at position FF in FIG1 .

[0023] The corresponding relationship between the reference numerals and component names is as follows:

[0024] 10 direct heat exchange area, 20 indirect heat exchange area, 30 interval gap, 100 first mounting frame, 110 mounting cavity, 120 first opening, 130 second opening, 140 air outlet, 150 penetration opening, 160 feed opening, 200 second mounting frame, 210 discharge opening, 220 air supply opening, 300 cylinder, 310 stop edge, 410 main pipeline, 411 pipe rack, 420 branch pipeline, 421 cyclone blade, 500 second heat exchange tube, 600 feed pipe, 700 partition plate, 710 feed port, 810 spiral feed pipe, 811 inlet of spiral feed pipe, 820 guide plate, 830 guide channel, 831 inlet of guide channel, 900 end head, 1000 first support plate, 1010 protective sleeve, 1100 second push plate, 1200 first push plate, 1300 propulsion blade, 2000 flue gas supply port.

[0025] Details

[0026] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that, unless there is a conflict, the embodiments and features in the embodiments of the present application can be combined with each other in any manner.

[0027] The embodiment of the present invention provides a flue gas rotary kiln, which has the advantages of simple structure, low exhaust flue gas temperature, low temperature of water vapor volatilized by heated materials, low energy consumption, and less heat loss of materials.

[0028] An embodiment of the present invention also provides a gypsum board production system.

[0029] The gypsum board production system proposed in the embodiment of the present invention, as shown in Figures 1 to 3, includes: a smoke rotary kiln, a smoke supply device, a dust collecting device (not shown in the figure), an air supply device (not shown in the figure) and a driving device (not shown in the figure). As shown in Figures 1 to 9, the smoke rotary kiln includes: a first mounting frame 100, the first mounting frame 100 has a mounting cavity 110, the cavity wall of the mounting cavity 110 is provided with a first opening 120, a second opening 130, an air outlet 140 and a through-hole 150, the first opening 120 is located on the left side wall of the mounting cavity 110, and the second opening 130 is located on the right side wall of the mounting cavity 110; a second mounting frame 200, the second mounting frame 200 is located on the right side of the first mounting frame 100, and is provided with a discharge port 210 and an air supply port 220; a cylinder 300, the left end of the cylinder 300 is rotatably sealed and mounted on the mounting cavity 110 from the second opening 130, and the right end is rotatably sealed and mounted on the second mounting frame 200, and the discharge port 210 and the air supply port 220 are both connected to the right end of the cylinder 300; the first heat exchange tube, the first heat exchange tube is located in the cylinder 300 and is connected to the cylinder 300; the second heat exchange tube 500, the second heat exchange tube 500 is located in the cylinder 300 and is connected to the cylinder 300, the right end of the first heat exchange tube is connected to the right end of the second heat exchange tube 500, the left end of the first heat exchange tube is rotatably sealed and mounted at the first opening 120, and is arranged to be connected to the smoke supply port 2000 of the smoke supply device through a rotary sealing structure; and a feed pipe 600 arranged to supply a second material, the discharge end of the feed pipe 600 passes through the penetration port 150 and extends between the first heat exchange tube and the cylinder 300, the second heat exchange tube 500 Located to the right of the feed pipe 600 and spaced axially from the feed pipe 600 in the cylinder 300, a direct heat exchange zone 10 is formed between the left end of the second heat exchange pipe 500 in the cylinder 300 and the discharge end of the feed pipe 600. The direct heat exchange zone 10 is connected to the air outlet 140 via the mounting cavity 110. An indirect heat exchange zone 20 is formed between the left end of the second heat exchange pipe 500 in the cylinder 300 and the right end of the second heat exchange pipe 500. The smoke supply port 2000 of the flue gas supply device is connected to the left end of the first heat exchange pipe and is configured to supply flue gas to the first heat exchange pipe. The dust collection device is connected to the air outlet 140 and is configured to collect dust discharged from the air outlet 140. The collected dust is a first material, which is a fine material, such as gypsum powder. The air supply device is connected to the air supply port 220 and is configured to supply an air beam to the air supply port 220. The air beam can be preheated exhaust gas discharged from the dust collecting device and then passed through the air supply device to the air supply port 220. The driving device is in transmission connection with the cylinder 300 and is configured to drive the cylinder 300 to rotate.

[0030] The flue gas rotary kiln combines a one-step calcination process and a two-step calcination process. The second material transmission stroke is the direct heat exchange zone 10 → the indirect heat exchange zone 20 → the discharge port 210; the flue gas transmission stroke is the left end of the first heat exchange tube → the first heat exchange tube → the right end of the first heat exchange tube → the right end of the second heat exchange tube 500 → the second heat exchange tube 500 → the left end of the second heat exchange tube 500 → the direct heat exchange zone 10 → the installation cavity 110 → the air outlet 140. The flue gas transmission stroke in this process is long, so the heat utilization rate of the flue gas is higher, and the second material is in direct contact with the flue gas in the direct heat exchange zone 10 for high-intensity heat exchange, so that most of the moisture contained in the second material is volatilized in the direct heat exchange zone 10, so that the temperature of the flue gas discharged from the air outlet 140 is low. The temperature is lower; the air supply port 220 supplies an air bundle into the cylinder 300 from the right end of the cylinder 300, and the air bundle transmission stroke is the indirect heat exchange zone 20→direct heat exchange zone 10→installation cavity 110→air outlet 140. The second material undergoes indirect heat exchange in the indirect heat exchange zone 20, which better ensures the calcination quality of the second material. Moreover, the air bundle blows a small amount of water vapor volatilized by the second material in the indirect heat exchange zone 20 back to the direct heat exchange zone 10, and the water vapor in the direct heat exchange zone 10 is blown out from the air outlet 140 under the joint blowing of the flue gas and the air bundle. In this way, the temperature of the water vapor is low and the stroke is short, and it is less likely to corrode the cylinder 300; the rolling of the cylinder 300 drives the second material to roll in the cylinder 300, thereby improving the drying effect of the second material in the cylinder 300.

[0031] In some examples, as shown in Figures 2, 3, 5 and 7, the penetration port 150 is located on the left side wall of the installation cavity 110, the air outlet 140 is located at the top of the peripheral wall of the installation cavity 110, the discharge port 210 is located at the lower part of the second installation frame 200, and the air supply port 220 is located at the upper part of the second installation frame 200. The second material is a coarse material, which can be a gypsum block. The axis of the cylinder 300 is tilted downward from left to right, and the left end of the cylinder 300 is provided with an inward-folded stop edge 310. The stop edge 310 prevents the second material in the direct heat exchange zone 10 from falling out of the cylinder 300 to the left.

[0032] In some exemplary embodiments, as shown in FIG2 and FIG8, the flue gas rotary kiln further includes: an annular partition plate 700, the partition plate 700 is fixed in the cylinder 300 and is located at one end of the indirect heat exchange zone 20 adjacent to the direct heat exchange zone 10, the left end of the second heat exchange tube 500 is movably provided in the partition plate 700, the first heat exchange tube is provided in the inner hole of the partition plate 700, and the periphery of the partition plate 700 is provided with a material passing port 710. The cylinder 300 rotates to partition the heat exchange tube 500. The second material on the left side of the plate 700 can move from the feed port 710 to the right side of the partition plate 700; the spiral feeding tube 810 is provided with a feed port 160 on the upper portion of the peripheral wall of the installation cavity 110. The spiral feeding tube 810 is fixed in the cylinder 300. The inlet 811 of the spiral feeding tube 810 is located in the area of ​​the peripheral wall of the cylinder 300 corresponding to the feed port 160. The outlet of the spiral feeding tube 810 is provided through the partition plate 700 and extends to the right side of the partition plate 700. Based on the rotation of the cylinder 300, the spiral feeding tube 810 moves with the cylinder. The spiral feeding tube 810 allows the first material supplied into the feed port 160 (i.e., the dust collected by the dust collecting device) to enter the spiral feeding tube 810 from the inlet 811 of the spiral feeding tube 810 and be transported along the spiral feeding tube 810 to the right side of the partition plate 700. As the cylinder 300 rotates, the spiral feed pipe 810 moves along with the cylinder, pushing the second material into the direct heat exchange zone 10 to the right. The spiral feed pipe 810 is fixed to and fits against the circumferential wall of the cylinder 300. A protective sleeve is provided between the partition plate 700 and the second heat exchange tube 500.

[0033] In some examples, as shown in FIG. 2 , the spiral feed tube 810 has at least one full spiral, thereby ensuring that the first material always remains in the spiral feed tube 810 , thereby preventing smoke from being blown to the feed port 160 through the spiral feed tube 810 .

[0034] In some examples, as shown in Figures 2 and 6, the flue gas rotary kiln further includes a guide plate 820, which is located between the cylinder 300 and the peripheral wall of the installation cavity 110 and encloses a guide channel 830 with the cylinder 300. The guide channel 830 is arranged along the circumference of the cylinder 300, and the outlet of the guide channel 830 is connected to the inlet 811 of the spiral feed pipe 810. Based on the rotation of the cylinder 300, the guide channel 830 is configured to allow the first material supplied into the feed port 160 to enter the guide channel 830 from the inlet 831 of the guide channel 830, and then enter the spiral feed pipe 810 through the guide channel 830.

[0035] In some examples, as shown in Figures 2 and 6, the guide plates 820 and the spiral feed tube 810 include multiple groups sequentially arranged in the circumferential direction of the cylinder 300, and the gap between each guide plate 820 and the peripheral wall of the installation cavity 110 gradually increases along the rotation direction of the cylinder 300. This can prevent the first material from blocking the gap between the guide plates 820 and the cavity wall of the installation cavity 110 and increasing the rotational resistance of the cylinder 300. The material passing through the gap between the guide plates 820 and the peripheral wall of the installation cavity 110 will eventually enter the guide channel 830 from the inlet 831 of the guide channel 830 at the bottom of the installation cavity 110. Rotary sealing structures can be provided on both the left and right sides of the guide plates 820 to limit the first material that falls between the cylinder 300 and the peripheral wall of the installation cavity 110, ensuring that it is entirely located on the circumference of the inlet 831 of the guide channel 830 during rotation.

[0036] In some examples, as shown in FIG2 and FIG8 , the flue gas rotary kiln further includes: a second pusher plate 1100, which is fixed to the left side of the partition plate 700 and is staggered with the material passage 710 in the circumferential direction of the cylinder 300. Based on the rotation of the cylinder 300, the second pusher plate 1100 moves with the cylinder 300. During this process, the second pusher plate 1100 first lifts up a portion of the second material at the bottom left side of the partition plate 700, and then flips the lifted second material downward on the upper side of the inner hole of the partition plate 700. In this way, the flipped second material falls from the inner hole of the partition plate 700 to the right side of the partition plate 700, effectively improving the passability of the second material at the partition plate 700.

[0037] In some examples, as shown in Figures 2 and 8, the second pusher plate 1100 includes multiple, multiple second pusher plates 1100 are arranged in sequence in the circumference of the partition plate 700, and each second pusher plate 1100 is arranged along the radial direction of the partition plate 700; the feeding port 710 includes multiple, multiple feeding ports 710 are arranged in sequence in the circumference of the cylinder 300.

[0038] In some exemplary embodiments, as shown in FIG3 , the flue gas rotary kiln further includes an end head 900 located within the barrel 300 and having a connecting cavity. The end head 900 is located to the right of the first and second heat exchange tubes 500. The right ends of the first and second heat exchange tubes 500 are both connected to the end head 900 and communicate with each other through the connecting cavity. A slit 30 is defined between the end head 900 and the peripheral wall of the barrel 300. The first and second materials on the left side of the slit 30 move from the slit 30 to the right side of the slit 30 and are ultimately discharged from the discharge port 210. The air stream on the right side of the slit 30 moves from the slit 30 to the left side of the slit 30 and is ultimately discharged from the air outlet 140.

[0039] In some examples, as shown in Figures 2 to 9, the first heat exchange pipe includes a main line 410 and multiple branch lines 420. The main line 410 is fixed in the cylinder 300 by a pipe rack 411. The multiple branch lines 420 are located on the right side of the main line 410 and are arranged in sequence along the circumference of the cylinder 300. The left end of the main line 410 is rotatably sealed and installed in the first opening 120, and is configured to be connected to the smoke supply port 2000 through a rotating sealing structure. The left ends of the multiple branch lines 420 are all connected to the right end of the main line 410, and the right ends of the multiple branch lines 420 are all connected to the connecting cavity; the second heat exchange pipe 500 includes multiple groups arranged in sequence in the circumference of the multiple branch lines 420, each group has multiple second heat exchange pipes 500, and the right end of each second heat exchange pipe 500 is connected to the connecting cavity. As the cylinder 300 rotates, the first and second materials tumbling within the indirect heat exchange zone 20 shuttle back and forth between the second heat exchange tube 500 and the branch pipe 420, achieving indirect drying and calcination through contact with the second heat exchange tube 500 and the branch pipe 420. In one example, the branch pipe 420 is provided with cyclone blades 421 to improve heating uniformity within the branch pipe 420. In another example, the second heat exchange tube 500 is also provided with cyclone blades.

[0040] Among them, the multiple heat exchange tubes 500 in each group are arranged into multiple rows in the radial direction of the cylinder 300, and the multiple heat exchange tubes 500 in each row are arranged in sequence along a straight line in the corresponding fan-shaped area in the circumferential direction of the cylinder 300. In this way, when the cylinder 300 rotates, the first material and the second material are stirred more vigorously in the gap between adjacent heat exchange tubes 500, so the drying effect of the first material and the second material in the cylinder 300 is better.

[0041] In some examples, as shown in Figure 2, the smoke supply port 2000 of the smoke supply device extends into the left end of the main line 410, the smoke supply device does not rotate with the cylinder 300, and the smoke supply port 2000 and the left end of the main line 410 are sealed by a rotating sealing structure. The smoke supply device supplies high-temperature smoke into the main line 410 through the smoke supply port 2000.

[0042] In some exemplary embodiments, as shown in Figures 3, 4 and 8, the flue gas rotary kiln further includes: multiple groups of first support plates 1000 (each group has multiple first support plates 1000 arranged in sequence in the axial direction of the cylinder 300), the multiple groups of first support plates 1000 are all located on the right side of the partition plate 700, and are installed one-to-one in correspondence with the multiple groups of second heat exchange tubes 500, and adjacent groups of first support plates 1000 in the circumferential direction of the cylinder 300 are staggered in the axial direction of the cylinder 300, so as to ensure that the first material and the second material are smoothly transported from left to right in the indirect heat exchange zone 20, and the multiple first support plates 1000 also play a role in pushing the first material and the second material to the right during the rolling process of the cylinder 300. As shown in Figures 3, 4, and 8, the first heat exchange tube (i.e., branch tube 420) is positioned at the inner edge of the adjacent first support plate 1000 by bolts and U-shaped clamps, and the first heat exchange tube can swing within the U-shaped clamp. In this solution, only the main tube 410 is fixed, and the left end of the branch tube 420 is fixedly connected to the main tube 410. The other parts of the branch tube 420 and the second heat exchange tube 500 are installed flexibly and are not fixed. In this way, when the first heat exchange tube and the second heat exchange tube 500 undergo thermal expansion and contraction, they will not cause damage to the flue gas rotary kiln. In addition, a protective sleeve 1010 is provided between the first support plate 1000 and the second heat exchange tube 500. The inner diameter of the protective sleeve 1010 is slightly larger than the outer diameter of the second heat exchange tube 500.

[0043] In some exemplary embodiments, as shown in FIG2 , the flue gas rotary kiln further includes a first pusher plate 1200 , which is located in the direct heat exchange zone 10 and fixed to the cylinder 300 . As the cylinder 300 rotates, the first pusher plate 1200 moves with the cylinder 300 . The first pusher plate 1200 pushes the second material in the direct heat exchange zone 10 rightward, allowing the second material to move more effectively from left to right during the rotation of the cylinder 300 .

[0044] In some examples, as shown in FIG2 , the first pusher plate 1200 includes a plurality of pusher plates 1200 , and the plurality of pusher plates 1200 are staggered in at least one of the axial direction and the circumferential direction of the cylinder 300 . Thus, during the rotation of the cylinder 300 , the first pusher plates 1200 can better push the second material to the right. Alternatively, the first pusher plates 1200 can be arranged to be inclined relative to the axis of the cylinder 300 .

[0045] In some exemplary embodiments, as shown in FIG2 , a plurality of propulsion blades 1300 are fixedly disposed between the left end of the first heat exchange tube (i.e., main conduit 4410) and the cylinder 300. These propulsion blades 1300 are sequentially arranged along the circumference of the cylinder 300. As the cylinder 300 rotates, the propulsion blades 1300 move with the cylinder 300, propelling the second material rightward. Alternatively, the propulsion blades 1300 may be configured as spiral blades.

[0046] In summary, the flue gas rotary kiln proposed in the embodiment of the present invention combines a one-step calcination process and a two-step calcination process. The second material transmission process is direct heat exchange zone → indirect heat exchange zone → discharge port; the flue gas transmission process is the left end of the first heat exchange tube → the first heat exchange tube → the right end of the first heat exchange tube → the right end of the second heat exchange tube → the second heat exchange tube → the left end of the second heat exchange tube → direct heat exchange zone → installation cavity → air outlet. In this process, the flue gas transmission process is long, so the heat utilization rate of the flue gas is higher, and the second material undergoes high-intensity heat exchange in the direct heat exchange zone, so that most of the moisture contained in the second material evaporates in large quantities in the direct heat exchange zone, so that the second material evaporates from the air outlet. The temperature of the exhausted flue gas is lower; the air supply port supplies an air bundle into the cylinder from the right end of the cylinder, and the air bundle transmission stroke is indirect heat exchange area → direct heat exchange area → installation cavity → air outlet. The second material undergoes indirect heat exchange in the indirect heat exchange area, which better ensures the calcination quality of the second material. Moreover, the air bundle blows a small amount of water vapor volatilized by the second material in the indirect heat exchange area back to the direct heat exchange area. The water vapor in the direct heat exchange area is then blown out from the air outlet under the joint blowing of the flue gas and the air bundle. In this way, the temperature of the water vapor is low, the stroke is short, and it is less likely to corrode the cylinder; the rolling of the cylinder drives the second material to roll in the cylinder, thereby improving the drying effect of the first material and the second material in the cylinder.

[0047] In the description of the present invention, it should be noted that the terms "upper", "lower", "one side", "the other side", "one end", "the other end", "side", "relative", "four corners", "periphery", ""mouth"-shaped structure", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the structure referred to has a specific orientation, is constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0048] In the description of the embodiments of the present invention, unless otherwise expressly specified or limited, the terms "connection," "direct connection," "indirect connection," "fixed connection," "installation," and "assembly" should be understood in a broad sense. For example, they may refer to a fixed connection, a detachable connection, or an integral connection. The terms "installation," "connection," and "fixed connection" may refer to a direct connection, an indirect connection through an intermediate medium, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0049] Although the embodiments disclosed herein are as described above, the contents described are merely embodiments for facilitating understanding of the present invention and are not intended to limit the present invention. It should be noted that the above embodiments or implementations are merely illustrative and not restrictive. Therefore, the present disclosure is not limited to the contents specifically shown and described herein. Various modifications, substitutions, or omissions may be made to the forms and details of the implementations without departing from the scope of the present disclosure.

Claims

1. A flue gas rotary kiln, comprising: A first mounting frame, comprising a mounting cavity, wherein a cavity wall of the mounting cavity is provided with a first opening, a second opening, an air outlet, and a through-hole, wherein the first opening is located on a left wall of the mounting cavity, and the second opening is located on a right wall of the mounting cavity; A second mounting frame, located on the right side of the first mounting frame and provided with a material outlet and an air supply port; A cylinder, the left end of which is rotatably mounted on the mounting cavity from the second opening, and the right end of which is rotatably mounted on the second mounting frame, and the discharge port and the air supply port are both connected to the right end of the cylinder; A first heat exchange tube is located in the cylinder and connected to the cylinder; a second heat exchange tube, located in the cylinder and connected to the cylinder, the right end of the first heat exchange tube is connected to the right end of the second heat exchange tube, the left end of the first heat exchange tube is rotatably mounted at the first opening and is arranged to be connected to the smoke supply port of the smoke supply device; and A feed pipe configured to supply a second material, wherein the discharge end thereof passes through the through-hole and extends between the first heat exchange pipe and the cylinder, and the second heat exchange pipe is located on the right side of the feed pipe and is spaced apart from the feed pipe in the axial direction of the cylinder; Among them, a direct heat exchange zone is formed between the left end of the second heat exchange tube in the cylinder and the discharge end of the feed pipe, and the direct heat exchange zone is connected with the air outlet through the installation cavity, and an indirect heat exchange zone is formed between the left end of the second heat exchange tube in the cylinder and the right end of the second heat exchange tube.

2. The flue gas rotary kiln according to claim 1, further comprising: The end head is located in the cylinder and is provided with a connecting cavity. The right end of the first heat exchange tube and the right end of the second heat exchange tube are both connected to the end head and communicated through the connecting cavity. There is a spacing gap between the end head and the peripheral wall of the cylinder.

3. The flue gas rotary kiln according to claim 2, wherein: The first heat exchange pipe includes a main pipe and a plurality of branch pipes, the left end of the main pipe is rotatably sealed and installed in the first opening, and is arranged to be connected and communicated with the smoke supply port through a rotating sealing structure, the left ends of the plurality of branch pipes are all connected with the right end of the main pipe, and the right ends of the plurality of branch pipes are all connected with the communication cavity; The second heat exchange tubes include a plurality of groups sequentially arranged in the circumferential direction of the plurality of branch pipes, and the right end of each of the second heat exchange tubes is connected to the communication cavity.

4. The flue gas rotary kiln according to claim 3, further comprising: A plurality of groups of first support plates are mounted on a plurality of groups of the second heat exchange tubes in a one-to-one correspondence, and adjacent groups of the first support plates in the circumferential direction of the cylinder are staggered in the axial direction of the cylinder.

5. The flue gas rotary kiln according to any one of claims 1 to 4, further comprising: An annular partition plate is fixed in the cylinder, the left end of the second heat exchange tube is passed through the partition plate, the first heat exchange tube is passed through the inner hole of the partition plate, and a material passing port is arranged around the partition plate; A spiral feed pipe, a feed port is provided on the peripheral wall of the installation cavity, the spiral feed pipe is fixed in the cylinder, the inlet of the spiral feed pipe is located in the area of ​​the peripheral wall of the cylinder corresponding to the feed port, the outlet of the spiral feed pipe is penetrated through the partition plate, based on the rotation of the cylinder, the spiral feed pipe is configured to allow the first material supplied into the feed port to enter the spiral feed pipe from the inlet of the spiral feed pipe and be transported along the spiral feed pipe to the right side of the partition plate, and the spiral feed pipe is also configured to push the second material in the direct heat exchange zone to the right.

6. The flue gas rotary kiln according to claim 5, further comprising: The material guide plate is located between the cylinder and the peripheral wall of the mounting cavity, and is enclosed with the cylinder to form a guide channel. The outlet of the guide channel is connected to the inlet of the spiral feeding pipe. Based on the rotation of the cylinder, the guide channel is configured to allow the first material supplied into the feed port to enter the guide channel from the inlet of the guide channel.

7. The flue gas rotary kiln according to claim 6, wherein: The guide plates and the spiral feed pipes include a plurality of groups sequentially arranged in the circumferential direction of the cylinder, and along the rotation direction of the cylinder, the gap between each guide plate and the peripheral wall of the installation cavity gradually increases.

8. The flue gas rotary kiln according to claim 5, further comprising: The second push plate is arranged on the left side of the partition plate and is staggered with the material passing port in the circumferential direction of the cylinder. Based on the rotation of the cylinder, the second push plate is arranged to flip the second material on the left side of the partition plate from the inner hole of the partition plate to the right side of the partition plate.

9. The flue gas rotary kiln according to claim 8, wherein: The second push plates include a plurality of second push plates, which are sequentially arranged in the circumferential direction of the partition plate, and each second push plate is arranged along the radial direction of the partition plate. The feed ports include a plurality of feed ports, which are sequentially arranged in the circumferential direction of the cylinder.

10. The flue gas rotary kiln according to any one of claims 1 to 4, further comprising: The first push plate is located in the direct heat exchange zone and fixed on the cylinder. Based on the rotation of the cylinder, the first push plate is configured to push the second material in the direct heat exchange zone to the right.

11. The flue gas rotary kiln according to claim 10, wherein: The first push plates include a plurality of first push plates, and the plurality of first push plates are staggered in at least one of the axial direction and the circumferential direction of the cylinder.

12. The flue gas rotary kiln according to any one of claims 1 to 4, wherein: A plurality of propulsion blades are fixedly provided between the left end of the first heat exchange tube and the cylinder body. The plurality of propulsion blades are sequentially arranged along the circumference of the cylinder body. Based on the rotation of the cylinder body, the plurality of propulsion blades are arranged to propel the second material to the right.

13. A gypsum board production system, comprising: The flue gas rotary kiln according to any one of claims 1 to 12; a smoke supply device, whose smoke supply port is connected to the left end of the first heat exchange tube, and the smoke supply device is configured to supply smoke to the first heat exchange tube; A dust collecting device, connected to the air outlet and configured to collect dust discharged from the air outlet; an air supply device, connected to the air supply port and configured to supply an air beam to the air supply port; and The driving device is in driving connection with the cylinder and is configured to drive the cylinder to rotate.

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