Calcination equipment and calcination system

Abstract

Disclosed herein is a calcining device and a calcining system. The calcining device comprises a cylinder and a heat exchange tube disposed in the cylinder, wherein the cylinder is provided with an inlet and an outlet, and the heat exchange tube is used to heat the material in the cylinder; the heat exchange tube has different heat exchange efficiencies at different positions along the length of the cylinder. The calcining device disclosed herein adjusts the heat exchange efficiency of the heat exchange tube at different positions along the length to achieve differentiated drying and calcination of materials at different positions, thereby avoiding the inability to control or difficulty in controlling the calcination of the material during the entire calcination process, and facilitating adjustment of calcination parameters according to different conditions of the material to obtain stable, high-quality gypsum powder, which is beneficial to improving the final quality of the gypsum product.

Description

Technical Field

[0001] The present application relates to but is not limited to the field of gypsum board production equipment, and in particular to a calcining equipment and a calcining system. Background Art

[0002] In the process of calcining gypsum, with the improvement of environmental protection requirements, coal-fired furnaces are becoming less and less. Using natural gas as a heat source is more expensive. Therefore, steam calcination technology is becoming more and more popular. Steam rotary kiln is becoming the mainstream because it can dry and calcine materials in the same equipment, and the process is simple and compact. However, in calcining equipment such as steam rotary kiln, there are often cases of overburning of materials, especially partial overburning, insufficient drying and insufficient calcination of gypsum, and unstable calcination quality, which affects the quality of the final gypsum product. Summary of the invention

[0003] The embodiments of the present application provide a calcining device and a calcining system, which have good drying and calcining effects on materials and can effectively avoid over-burning, insufficient calcination, etc.

[0004] The embodiment of the present application provides a calcining device, which includes a cylinder and a heat exchange tube arranged in the cylinder, wherein the cylinder is provided with a material inlet and a material outlet, and the heat exchange tube is used to heat the material in the cylinder;

[0005] The heat exchange efficiency of the heat exchange tube at different positions along the length direction of the cylinder is different.

[0006] In an exemplary embodiment, the heat exchange tube includes a first tube segment, a second tube segment and a third tube segment along the length direction of the cylinder, the heat exchange efficiency at the second tube segment is greater than the heat exchange efficiency at the first tube segment, and the heat exchange efficiency at the third tube segment is less than the heat exchange efficiency at the first tube segment.

[0007] In an exemplary embodiment, a spiral fin is disposed on the outer side of the second pipe segment, and a sleeve is sleeved on the outer side of the third pipe segment.

[0008] In an exemplary embodiment, the heat exchange tube is arranged in a plurality in the circumferential direction of the cylinder, and the plurality of heat exchange tubes are arranged to form a polygonal structure.

[0009] In an exemplary embodiment, a plurality of the heat exchange tubes in the circumferential direction are arranged to form a regular hexagon.

[0010] In an exemplary embodiment, the heat exchange tube is provided with multiple layers along the radial direction of the cylinder.

[0011] In an exemplary embodiment, the cylinder extends in a horizontal direction and is inclined relative to the horizontal direction, so that the feeding end of the cylinder is higher than the discharging end of the cylinder.

[0012] In an exemplary embodiment, the inclination angle of the cylinder is 1° to 3°.

[0013] In an exemplary embodiment, the calcining device further comprises a partition plate disposed in the cylinder, wherein the partition plate divides the cylinder into a plurality of relatively independent cavities;

[0014] The partition plate is provided with through holes for materials to pass through.

[0015] In an exemplary embodiment, the calcining device further includes a discharge plate connected to the partition plate, one end of the discharge plate extending toward the through hole of the partition plate to guide the material to the through hole and pass through the partition plate.

[0016] In an exemplary embodiment, the partition plate is an annular plate, and the through hole is located in the middle of the partition plate;

[0017] The discharge plate includes a connected shielding plate and a guide plate, wherein the shielding plate is fixed on the partition plate and extends radially along the partition plate to the through hole, and the guide plate extends axially along the partition plate and passes through the through hole to guide the material to pass through the through hole.

[0018] In an exemplary embodiment, the calcining equipment further includes a supporting device for supporting the cylinder.

[0019] In an exemplary embodiment, the support device comprises a base and two support wheels, and the two support wheels are rotatably mounted on the base;

[0020] The two supporting wheels respectively abut against two sides of the bottom of the cylinder to support the cylinder.

[0021] In an exemplary embodiment, the calcining equipment further includes a power device for driving the cylinder to rotate.

[0022] In an exemplary embodiment, the calcining equipment further comprises a material raising plate disposed on the inner wall of the cylinder, wherein the material raising plate extends in a radial direction of the cylinder.

[0023] In an exemplary embodiment, a middle discharge port is provided on the cylinder, and part of the material in the cylinder is discharged through the middle discharge port.

[0024] In an exemplary embodiment, the calcining equipment is a gypsum calcining equipment.

[0025] The embodiment of the present application further provides a calcining system, which includes a feeder and the aforementioned calcining equipment, wherein the outlet of the feeder is connected to the feed inlet.

[0026] In an exemplary embodiment, the feeder is provided with a wet material inlet and a return material inlet, and part of the material in the calcining device enters the feeder through the return material inlet;

[0027] In the conveying direction of the material, the return material inlet is located upstream of the wet material inlet.

[0028] In an exemplary embodiment, the feeder is a double screw feeder.

[0029] Compared with some technologies, this application has the following beneficial effects:

[0030] The calcination equipment provided in the embodiment of the present application adjusts the heat exchange efficiency at different positions along the length of the heat exchange tube to achieve differentiated drying and calcination of materials at different positions, thereby avoiding the inability to control or difficulty in controlling the calcination of the material during the entire calcination process, and facilitating the adjustment of calcination parameters according to different conditions of the material to obtain stable, high-quality gypsum powder, which is beneficial to improving the final quality of the gypsum product.

[0031] The calcination system provided in the embodiment of the present application has the aforementioned calcination equipment, and the production is efficient and stable, and the quality of the gypsum finished product is high.

[0032] Other features and advantages of the present application will be set forth in the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings are used to provide further understanding of the technical solution of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solution of the present application and do not constitute a limitation on the technical solution of the present application.

[0034] Figure 1 This is a schematic diagram of the structure of the calcining equipment described in the embodiment of the present application. Figure 1 ;

[0035] Figure 2 The partial structure diagram of the calcining equipment described in the embodiment of the present application is shown in FIG. Figure 1 ;

[0036] Figure 3 The partial structure diagram of the calcining equipment described in the embodiment of the present application is shown in FIG. Figure 2 ;

[0037] Figure 4 The partial structure diagram of the calcining equipment described in the embodiment of the present application is shown in FIG. Figure 3 ;

[0038] Figure 5 The partial structure diagram of the calcining equipment described in the embodiment of the present application is shown in FIG. Figure 4 ;

[0039] Figure 6The partial structure diagram of the calcining equipment described in the embodiment of the present application is shown in FIG. Figure 5 ;

[0040] Figure 7 for Figure 1 Middle AA section view;

[0041] Figure 8 for Figure 1 Middle BB section view;

[0042] Fig. 9 This is a schematic diagram of the structure of the partition plate and the discharge plate described in the embodiment of the present application;

[0043] Fig.10 The structure of the discharge plate described in the embodiment of the present application is schematically shown. Figure 1 ;

[0044] Fig.11 The structure of the discharge plate described in the embodiment of the present application is schematically shown. Figure 2 ;

[0045] Fig.12 This is a schematic diagram of the structure of the second pipe segment and the third pipe segment described in an embodiment of the present application.

[0046] Illustration Description:

[0047] 1- cylinder, 11- inlet, 12- middle discharge port, 121- middle return air port, 122- discharge port, 13- discharge port, 131- tail return air port, 14- heat exchange tube, 141- first tube section, 142- second tube section, 143- third tube section, 144- spiral fin, 145- sleeve, 15- partition plate, 151- mounting hole, 152- through hole, 16- sleeve tube, 17- discharge plate, 171- shielding plate, 172- guide plate, 173- raised edge, 18- lifting plate, 191- non-condensable gas discharge valve, 192- steam inlet, 193- condensate outlet, 2- support device, 21- installation platform, 3- power device, 4- feeder, 41- return material inlet, 42- wet material inlet, 43- wet gas outlet, 44- rotating shaft, 45- blade. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solution and advantages of the present application more clear, the embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other arbitrarily without conflict.

[0049] The current overburning situation is generally avoided by lowering the calcination temperature or reducing the residence time of the material in the rotary kiln. However, the above methods are prone to other problems. For example, lowering the calcination temperature will affect the calcination efficiency and reduce the calcination effect, resulting in high humidity in the gypsum powder; reducing the residence time of the material in the rotary kiln will also cause the gypsum powder to dry out and insufficient calcination, affecting the quality of the final gypsum product.

[0050] The present application embodiment provides a calcining device, such as Figures 1 to 12 As shown, the calcining equipment includes a cylinder 1 and a heat exchange tube 14 arranged in the cylinder 1. The cylinder 1 is provided with an inlet 11 and an outlet 13. The heat exchange tube 14 is used to heat the material in the cylinder 1. The heat exchange efficiency of the heat exchange tube 14 at different positions along the length direction of the cylinder 1 is different.

[0051] The following description is made using gypsum as the calcined material.

[0052] The gypsum powder is dried and calcined in the cylinder 1, and the water in the gypsum powder is removed to form a powder that meets the requirements and enters the subsequent production equipment. The material in the feeder 4 enters the cylinder 1 through the feed port 11, and the gypsum powder after calcination in the cylinder 1 is discharged to the subsequent production equipment through the discharge port 13 (i.e., the tail discharge port 122).

[0053] A heat exchange tube 14 is provided in the cylinder 1, and high-temperature steam is passed into the heat exchange tube 14 to facilitate heat exchange of the gypsum powder, dry and calcine the gypsum powder, and remove moisture from the gypsum powder. The length direction of the heat exchange tube 14 is consistent with the length direction of the cylinder 1, that is, the heat exchange tube 14 extends along the axial direction of the cylinder 1, so that the gypsum powder can be dried and calcinated in the entire cylinder 1.

[0054] The heat exchange efficiency at different positions of the heat exchange tube 14 is adjusted according to actual needs and calcination experience to deal with problems such as overburning and insufficient calcination.

[0055] The calcination equipment provided in the embodiment of the present application adjusts the heat exchange efficiency of the heat exchange tube 14 at different positions along the length to achieve differentiated drying and calcination of materials at different positions, thereby avoiding the inability to control or difficulty in controlling the calcination of the material during the entire calcination process, and facilitating the adjustment of calcination parameters according to different conditions of the material to obtain stable, high-quality gypsum powder, which is beneficial to improving the final quality of the gypsum product.

[0056] In an exemplary embodiment, if Figures 1 to 6 As shown, the heat exchange tube 14 includes a first tube segment 141, a second tube segment 142 and a third tube segment 143 along the length direction of the cylinder 1, the heat exchange efficiency at the second tube segment 142 is greater than the heat exchange efficiency at the first tube segment 141, and the heat exchange efficiency at the third tube segment 143 is less than the heat exchange efficiency at the first tube segment 141.

[0057] During the calcination process of gypsum powder, overburning is a common problem and needs to be dealt with in detail.

[0058] The heat exchange tube 14 is sequentially provided with a first tube section 141, a second tube section 142 and a third tube section 143 in the length direction. The first tube section 141 is located upstream, close to the feed inlet 11, and the third tube section 143 is located downstream, close to the discharge outlet 13.

[0059] Among the three pipe sections, the heat exchange efficiency of the second pipe is the highest, the heat exchange efficiency of the third pipe section 143 is the lowest, and the heat exchange efficiency of the first pipe section 141 is in the middle. In the actual calcination process, the gypsum powder first contacts the first pipe section 141, and the first pipe section 141 dries and calcines the gypsum powder with a higher heat exchange efficiency. After the gypsum powder is fully preheated and dried, the gypsum powder reaches the position of the second pipe section 142, and the second pipe section 142 heats the gypsum powder with a higher heat exchange efficiency, and fully calcines to remove moisture in the gypsum powder. The heat exchange efficiency at the second pipe section 142 is higher than that at the first pipe section 141, which can avoid energy waste. The first pipe section 141 mainly plays the role of preheating and drying the gypsum powder, and does not require a high heat exchange efficiency. After the gypsum powder is fully preheated and dried, the heat of the steam can be fully exchanged with the gypsum powder at the second pipe section 142, thereby improving the calcination effect of the gypsum powder at the second pipe section 142 and making full use of the heat of the steam. The heat exchange efficiency is reduced at the subsequent third pipe section 143 to avoid overburning of the gypsum powder, ensure the calcination quality of the gypsum powder, and also reduce the consumption of steam heat.

[0060] Corresponding to the steam calcination, the calcination equipment may also be provided with: a non-condensable gas discharge valve 191 for discharging non-condensable gas; a steam inlet 192 for introducing steam; and a condensate outlet 193 for discharging condensate. Figure 2 shown.

[0061] In an exemplary embodiment, if Figures 2 to 5 and Fig.12 As shown, a spiral fin 144 is disposed on the outer side of the second pipe section 142 , and a sleeve 145 is sleeved on the outer side of the third pipe section 143 . Fig.12 It is a partial enlarged view of the connection between the second pipe segment 142 and the third pipe segment 143 to clearly show the structure of the second pipe segment 142 and the third pipe segment 143 in other drawings.

[0062] No other components may be arranged on the outside of the first pipe section 141, that is, the outside of the first pipe section 141 is a smooth wall surface. Left and right spiral fins 144 are arranged on the outside of the second pipe section 142 to improve the heat exchange efficiency at the second pipe section 142. Of course, other structures for enhancing heat exchange, such as grid plate fins, etc., may also be arranged on the outside of the second pipe section 142 to make the heat exchange efficiency at the second pipe section 142 higher than that at the first pipe section 141. A sleeve 145 is arranged on the outside of the third pipe section 143 to hinder the heat exchange between the steam in the third pipe section 143 and the gypsum powder, so that the heat exchange efficiency at the third pipe section 143 is lower than that at the first pipe section 141.

[0063] It should be understood that there are many ways to adjust the heat exchange efficiency at the first pipe segment 141, the second pipe segment 142 and the third pipe segment 143, which are not limited to the above-mentioned methods. Other structures can also be used, such as: appropriately reducing the wall thickness at the second pipe segment 142 to improve the heat exchange efficiency at the second pipe segment 142; appropriately increasing the wall thickness at the third pipe segment 143 to reduce the heat exchange efficiency at the third pipe segment 143. The present application does not limit this.

[0064] In an exemplary embodiment, if Figure 8 As shown, a plurality of heat exchange tubes 14 are arranged in the circumferential direction of the cylinder 1, and the plurality of heat exchange tubes 14 are arranged to form a polygonal structure.

[0065] The heat exchange tube 14 is fixedly arranged in the cylinder 1 and rotates with the cylinder 1. During the rotation process, in order to prevent the gypsum powder in the cylinder 1 from forming a circulation, the multiple heat exchange tubes 14 are arranged in a polygonal shape, so that the heat exchange tubes 14 can play a role in breaking up the gypsum powder during the rotation process. In other words, the heat exchange tubes 14 are arranged in a non-circular shape, and the gypsum powder will collide with the heat exchange tubes 14 during the process of forming a circulation, and the heat exchange tubes 14 will prevent the gypsum powder from forming a circulation, thereby ensuring the heat exchange tubes 14 The effect of drying and calcining the gypsum powder.

[0066] It should be understood that there are many ways to surround the heat exchange tubes 14 to form a polygonal structure, such as: arranging 4 heat exchange tubes 14 at the four vertices of the quadrilateral to form a quadrilateral. Or, for example: arranging 8 heat exchange tubes 14, each 2 heat exchange tubes 14 form a group to form a side of the quadrilateral to form a quadrilateral. The specific number of heat exchange tubes 14 mentioned above is only for illustration and is not necessarily the number of heat exchange tubes 14 required in this application.

[0067] Of course, the heat exchange tubes 14 may also be arranged in other forms, such as elliptical, semicircular, etc., and the present application does not limit this.

[0068] Specifically, Figure 8 As shown, a plurality of heat exchange tubes 14 in the circumferential direction may be arranged to form a regular hexagon.

[0069] In an exemplary embodiment, if Figure 8 As shown, the heat exchange tubes 14 are arranged in multiple layers along the radial direction of the cylinder 1 .

[0070] Multiple layers of heat exchange tubes 14 are arranged in the radial direction to increase the number of heat exchange tubes 14 , effectively remove moisture from the gypsum powder, and improve the drying and calcining effect of the heat exchange tubes 14 on the gypsum powder.

[0071] The number of layers and specific quantity of the heat exchange tubes 14 can be adjusted according to actual needs.

[0072] A certain gap is provided between the adjacent heat exchange tubes 14 in the radial direction or the circumferential direction, and the gypsum powder is heated by the heat exchange tubes 14 through the gap to obtain a good calcination effect.

[0073] In an exemplary embodiment, if Figure 1 As shown, the cylinder 1 extends in the horizontal direction and is inclined relative to the horizontal direction, so that the feeding end of the cylinder 1 is higher than the discharging end of the cylinder 1.

[0074] The entire body is arranged roughly in the horizontal direction and slightly inclined downward, that is, the feeding end of the cylinder 1 is higher than the discharging end of the cylinder 1 , so that the gypsum board powder moves to the discharging end of the cylinder 1 .

[0075] In an exemplary embodiment, the inclination angle of the barrel 1 is 1° to 3°.

[0076] The inclination angle of the cylinder 1 is set between 1° and 3° to avoid the inclination angle being too large, which may cause the gypsum powder to move too fast and cause insufficient calcination, and the inclination angle being too small, which may have no effect on the movement of the gypsum powder.

[0077] In practical applications, the inclination angle of the cylinder 1 can be set to 1.15°.

[0078] In an exemplary embodiment, if Figure 4 and Fig. 9 As shown, the calcining device further includes a partition plate 15 disposed in the cylinder 1, and the partition plate 15 divides the cylinder 1 into a plurality of relatively independent cavities; the partition plate 15 is provided with a through hole 152 for the passage of materials.

[0079] The partition plate 15 is used to divide the space in the cylinder 1, dividing the cylinder 1 into a plurality of relatively independent cavities, realizing zoned calcination, ensuring the calcination quality, and ensuring the effective volume of each calcination area (cavity). The connected cavities are connected through the through hole 152, and the gypsum powder passes through the through hole 152 from the upper cavity into the next cavity.

[0080] The partition plate 15 may be provided with a mounting hole 151 for the heat exchange tube 14 to pass through, and the heat exchange tube 14 passes through the mounting hole 151 and extends along the axial direction of the cylinder 1. The partition plate 15 has a certain supporting and fixing effect on the heat exchange tube 14, preventing the heat exchange tube 14 from loosening or shaking during the rotation of the cylinder 1, and ensuring the normal and reliable operation of the calcining equipment. A sleeve tube 16 may be provided in the mounting hole 151 to protect the heat exchange tube 14 and prevent the heat exchange tube 14 from being easily damaged at the mounting hole 151.

[0081] Dividing the cylinder 1 into multiple cavities can effectively prevent the gypsum powder from reaching the discharge end quickly after entering the cylinder 1, and avoid the situation where the gypsum powder is not fully calcined. In other words, the partition plate 15 has a certain blocking effect on the gypsum powder. After being blocked by the partition plate 15, the gypsum powder will be carried up and scattered by the rotating cylinder 1, so that the gypsum powder is as evenly distributed as possible in the cylinder 1, fully in contact with the heat exchange tube 14, and fully heated and calcined; the gypsum powder evenly distributed in the cavity will gradually pass through the through hole 152 and enter the next cavity.

[0082] In practical applications, the number of partition plates 15 can be set to two, one at the middle position of the cylinder 1 in the axial direction, and one at the tail discharge port 13, so as to divide the space inside the cylinder 1 into three relatively independent spaces.

[0083] In an exemplary embodiment, if Figure 4 , Fig. 9 , Fig.10 and Fig.11 As shown, the calcining device further includes a discharge plate 17 connected to the partition plate 15 , and one end of the discharge plate 17 extends toward the through hole 152 of the partition plate 15 to guide the material to the through hole 152 and pass through the partition plate 15 .

[0084] The discharge plate 17 can play a certain guiding role, making it easier for the scattered gypsum powder to pass through the through hole 152. The gypsum powder falling on the discharge plate 17 will slide to the through hole 152 along the extension direction of the discharge plate 17, and then pass through the through hole 152 into the next cavity.

[0085] In practical applications, the discharge plate 17 can be connected not only to the partition plate 15, but also to the inner wall of the cylinder 1, so that the discharge plate 17 can also improve the strength of the partition plate 15, ensuring that the partition plate 15 is reliably fixed and can remain firm during the long-term flushing process of gypsum powder.

[0086] There may be a plurality of discharge plates 17 evenly arranged along the circumferential direction of the cylinder 1 , so as to improve the material guiding effect of the discharge plates 17 and the reinforcing effect on the partition plate 15 .

[0087] In an exemplary embodiment, if Fig. 9As shown, the partition plate 15 is an annular plate, and the through hole 152 is located in the middle position of the partition plate 15; the discharge plate 17 includes a connected shielding plate 171 and a guide plate 172, the shielding plate 171 is fixed on the partition plate 15 and extends along the radial direction of the partition plate 15 to the through hole 152, and the guide plate 172 extends along the axial direction of the partition plate 15 and passes through the through hole 152 to guide the material to pass through the through hole 152.

[0088] The partition plate 15 is an annular plate, and the mounting holes 151 for the heat exchange tubes 14 to pass through are arranged on the annular plate along the circumferential direction, and the through hole 152 is a circular hole in the middle of the annular plate.

[0089] like Fig.10 and Fig.11 As shown, the shielding plate 171 and the guide plate 172 are located on the same plane (radial plane), perpendicular to the rotation direction of the cylinder 1, and perpendicular to the partition plate 15. One end of the shielding plate 171 extends to the inner wall of the cylinder 1, and the other end extends radially to the through hole 152 to guide the gypsum powder to the through hole 152. The guide plate 172 extends along the axial direction in the cylinder 1 and one end of itself is connected to the other end of the shielding plate 171, and the other end of the guide plate 172 passes through the through hole 152 to guide the gypsum powder to pass through the through hole 152.

[0090] A raised edge 173 may be provided on the shielding plate 171 and the guide plate 172 so that the gypsum powder falling on the shielding plate 171 and the guide plate 172 can fall off and be thrown out.

[0091] In an exemplary embodiment, if Figure 1 , Figure 3 and Figure 5 As shown, the calcining equipment further comprises a supporting device 2 for supporting the cylinder 1 .

[0092] The supporting device 2 is used to support the cylinder 1 so as to fix the cylinder 1 at a desired height and a desired inclination angle.

[0093] The supporting device 2 can be provided in multiple numbers to support the cylinder 1 at multiple positions in the axial direction of the cylinder 1. In practical applications, the number of supporting devices 2 can be two, which are respectively located upstream and downstream of the cylinder 1, that is, near the positions of the feed port 11 and the discharge port 13. The height of the supporting device 2 located downstream is lower than the height of the supporting device 2 located upstream, so that the cylinder 1 maintains an inclination angle of 1.15°.

[0094] In an exemplary embodiment, the supporting device 2 includes a base and two supporting wheels (not shown in the figure), and the two supporting wheels are rotatably mounted on the base; the two supporting wheels respectively abut against two sides of the bottom of the cylinder 1 to support the cylinder 1.

[0095] The support wheel is rotatably fixed on the base, and the support wheel is in contact with the cylinder 1. While the support wheel provides a supporting force, it will not hinder the rotation of the cylinder 1. When the cylinder 1 rotates, the support wheel will rotate with the cylinder 1.

[0096] In an exemplary embodiment, if Figure 1 and Figure 3 As shown, the calcining equipment also includes a power device 3 for driving the cylinder 1 to rotate.

[0097] The power device 3 provides power for the cylinder 1 to rotate.

[0098] The power device 3 and the cylinder 1 can be driven by belt drive, gear drive and other methods. The power device 3 can also use different forms of drive motors according to actual needs, which will not be repeated here.

[0099] In practical applications, the support device 2 is installed on the installation platform 21. When the number of the support devices 2 is two, the number of the installation platforms 21 is also two. The power device 3 can be installed on the same installation platform 21 as one of the support devices 2.

[0100] In an exemplary embodiment, if Figure 2 , Figure 3 and Figure 5 As shown, the calcining equipment further comprises a material raising plate 18 arranged on the inner wall of the cylinder 1 , and the material raising plate 18 extends in the radial direction of the cylinder 1 .

[0101] The lifting plate 18 is used to lift and scatter the gypsum powder. During the rotation of the cylinder 1, the gypsum powder will rotate with it, and it is easy to form a circulation. The lifting plate 18 is arranged on the inner wall of the cylinder 1 to scatter the gypsum powder, prevent the gypsum powder from forming a circulation, and allow the gypsum powder to fully exchange heat with the heat exchange tube 14 and be fully heated and calcined.

[0102] A plurality of lifting plates 18 are provided along the axial direction and the circumferential direction of the cylinder body 1 and are evenly arranged to improve the lifting effect and fully disperse the gypsum powder.

[0103] In an exemplary embodiment, if Figure 4 As shown, an intermediate discharge port 12 is provided on the cylinder 1 , and part of the material in the cylinder 1 is discharged through the intermediate discharge port 12 .

[0104] In practical applications, multiple discharge ports 122 may be provided around the cylinder 1, and a return valve is installed at each discharge port 122. An annular sealing cover is sleeved on the outside of the cylinder 1, which is fixed and dynamically sealed with the cylinder 1, so as to guide the materials discharged from the multiple discharge valves to the middle discharge port 12 and discharged to other production equipment (such as: the feeder 4 located upstream of the cylinder 1).

[0105] In addition, an intermediate return air port 121 for blowing in preheated air may be provided on the cylinder 1, and the intermediate return air port 121 and the intermediate discharge port 12 are located at the same axial position of the cylinder 1. In the calcination process, the heat is fully utilized, and the intermediate discharge port 12 is ensured to be slightly positively pressured, which is convenient for discharging; a tail return air port 131 for blowing in preheated air may be provided on the cylinder 1, and the tail return air port 131 and the tail discharge port 122 (i.e., the discharge port 13) are located at the same axial position of the cylinder 1. In the calcination process, the heat is fully utilized, and the tail discharge port 122 is ensured to be slightly positively pressured, which is convenient for discharging.

[0106] In an exemplary embodiment, the calcining equipment is a gypsum calcining equipment, such as a rotary kiln.

[0107] Of course, the calcining equipment provided in the embodiment of the present application can also be used to calcine other materials, not limited to gypsum.

[0108] The calcining equipment provided by the embodiment of the present application is stable, efficient and energy-saving. The calcining equipment is provided with an intermediate discharge port 12, and part of the material is returned to the double-screw feeder. In the double-screw feeder, the returned dry gypsum powder is added first, and the wet desulfurized gypsum raw material is added later. The dry gypsum powder added first avoids direct contact between the wet desulfurized gypsum raw material and the equipment, and the free water content in the returned dry gypsum powder is very low, and there is almost no chemical corrosion to the equipment; at the same time, due to the high return temperature (about 110°C), it heats the wet desulfurized gypsum raw material in the double-screw feeder and stirs and mixes with it, accelerating the drying of the desulfurized gypsum raw material; the double-screw feeder adopts double-axis counter-rotating stirring, and the blades 45 are evenly tilted to ensure uniform mixing of dry and wet materials; the heating pipe and bracket at the feeding end of the calcining equipment adopt corrosion-resistant (Cl - , SO4 2-The above measures greatly reduce the corrosion of the double-screw feeder and calcining equipment. At the same time, the moisture outlet 43 is placed on the high-humidity side of the feed port 11, so that the generated water vapor can be discharged in time to avoid high-humidity gas from penetrating the calcining equipment, which not only reduces the corrosion of the calcining equipment, but also optimizes the calcination quality. The preheated air is blown into the calcining equipment from the middle return air port 121 and the rear return air port 131, which not only makes full use of the heat, but more importantly reduces the humidity of the atmosphere above the calcining equipment, reduces the corrosion of the calcining equipment and subsequent dust collection equipment, and ensures that the middle discharge port 12 and the rear discharge port 122 are slightly positive pressure, which is conducive to discharge. The heat exchange tube 14 uses a light tube near the feed end, a spiral fin 144 is set in the middle section, and a sleeve 145 is set at the discharge end. Since the wet material has a certain viscosity, the use of a smooth tube at the feed end can effectively prevent the wet material from adhering to the outer wall of the tube. The spiral fins 144 are used in the middle section to increase the heat exchange area and improve the heat exchange intensity. The sleeve 145 is set at the discharge end to effectively weaken the heat transfer and prevent the material from overburning. A partition plate is provided before the middle discharge port 12 and the tail discharge port 122 to divide the calcination equipment into multiple calcination areas to achieve zoned calcination, ensure the calcination quality, and ensure the effective volume of each calcination area. The lifting plate 18 is evenly and spirally arranged along the inner wall of the cylinder 1. As the cylinder 1 rotates, the material close to the inner wall is lifted to prevent the material from sliding along the inner wall to form a circulation and affect the uniformity of calcination. At the same time, the heat exchange tube 14 is arranged in a regular polygon (non-circular). During the rotation of the cylinder 1, the heat exchange tube 14 stirs and breaks up the material, so that the calcination is more uniform.

[0109] The embodiment of the present application further provides a calcining system, which includes a feeder 4 and the aforementioned calcining equipment, and the outlet of the feeder 4 is connected to the feed inlet 11 .

[0110] The calcination system provided in the embodiment of the present application has the aforementioned calcination equipment, and the production is efficient and stable, and the quality of the gypsum finished product is high.

[0111] In an exemplary embodiment, if Figure 6 As shown, the feeder 4 is provided with a wet material inlet 42 and a return material inlet 41 , and part of the material in the calcining device enters the feeder 4 through the return material inlet 41 ; in the conveying direction of the material, the return material inlet 41 is located upstream of the wet material inlet 42 .

[0112] The middle part of the calcining equipment is fed back to the feeder 4, and the fed back dry gypsum powder is first added to the feeder 4, and then the wet desulfurized gypsum raw material is added. The first added dry gypsum powder avoids direct contact between the wet desulfurized gypsum raw material and the equipment, and the free water content in the fed back dry gypsum powder is very low, and there is almost no chemical corrosion to the equipment; at the same time, due to the high temperature of the fed back (about 110°C), it heats the wet desulfurized gypsum raw material in the feeder 4, and stirs and mixes with it, accelerating the drying of the desulfurized gypsum raw material; greatly reducing the corrosion of the feeder 4 and the calcining equipment.

[0113] The return material inlet 41 of the intermediate return material on the feeder 4 is located before the wet material inlet 42 of the gypsum raw material on the feeder 4 to ensure that the feeder 4 will not be corroded by the gypsum raw material (or the degree of corrosion of the gypsum raw material on the feeder 4 is greatly reduced). Of course, the return material inlet 41 of the intermediate return material on the feeder 4 can also be the same inlet as the wet material inlet 42 of the gypsum raw material on the feeder 4 (that is, the intermediate return material and the gypsum raw material enter the feeder 4 at the same feed inlet 11).

[0114] In addition, a moisture outlet 43 is provided on the feeder 4. The moisture outlet 43 is located downstream of the wet material inlet 42 and is used to discharge moisture from the system. The moisture in the feeder 4 and the calcining equipment is discharged from here.

[0115] In an exemplary embodiment, the feeder 4 is a double screw feeder.

[0116] The double screw feeder is used to fully mix the raw materials and the recycled materials and feed them into the rotary kiln. The double screw feeder has the effect of both material transportation and material dispersion.

[0117] The blades 45 in the double screw feeder can be in the form of discontinuous spiral blades 45. The continuous spiral blades 45 have high conveying efficiency, but the gypsum powder is easy to agglomerate during the conveying process, which is not conducive to the subsequent drying and calcining process of the gypsum powder. The double screw feeder in the embodiment of the present application is provided with multiple, discontinuous blades 45, and multiple blades 45 are radially arranged on the rotating shaft 44 of the double screw feeder, and are arranged axially inclined so as to generate axial thrust on the material during the rotation of the blades 45. While the blades 45 rotate to push the material forward, they also have a certain breaking up effect on the material to prevent the gypsum powder from agglomerating during the conveying process.

[0118] In the description of the present application, it should be noted that the orientations or positional relationships indicated by “upper”, “lower”, “one end”, “one side”, etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the structure referred to has a specific orientation, is constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0119] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the terms "connection", "assembly", and "installation" should be understood in a broad sense. For example, the term "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0120] The embodiments described in this application are exemplary rather than restrictive, and it is obvious to those skilled in the art that there may be more embodiments and implementations within the scope of the embodiments described in this application. Although many possible feature combinations are shown in the drawings and discussed in the specific embodiments, many other combinations of the disclosed features are also possible. Unless specifically limited, any feature or element of any embodiment may be used in combination with any other feature or element in any other embodiment, or may replace any other feature or element in any other embodiment.

[0121] The present application includes and contemplates combinations of features and elements known to those of ordinary skill in the art. The embodiments, features, and elements disclosed in the present application may also be combined with any conventional features or elements to form a unique technical solution defined by the claims. Any features or elements of any embodiment may also be combined with features or elements from other technical solutions to form another unique technical solution defined by the claims. Therefore, it should be understood that any feature shown and / or discussed in the present application may be implemented individually or in any appropriate combination. Therefore, except for the limitations made according to the attached claims and their equivalents, the embodiments are not subject to other restrictions. In addition, various modifications and changes may be made within the scope of protection of the attached claims.

Claims

1. A calcining device, characterized in that: It comprises a cylinder and a heat exchange tube arranged in the cylinder, the cylinder is provided with a material inlet and a material outlet, and the heat exchange tube is used to heat the material in the cylinder; The heat exchange efficiency of the heat exchange tube at different positions along the length direction of the cylinder is different; The heat exchange tube includes a first tube section, a second tube section and a third tube section along the length direction of the cylinder, the heat exchange efficiency at the second tube section is greater than the heat exchange efficiency at the first tube section, and the heat exchange efficiency at the third tube section is less than the heat exchange efficiency at the first tube section.

2. The calcining equipment according to claim 1, characterized in that The outer side of the second pipe section is provided with spiral fins, and the outer side of the third pipe section is sleeved with a sleeve.

3. The calcining equipment according to claim 1, characterized in that The heat exchange tubes are arranged in a plurality in the circumferential direction of the cylinder, and the plurality of heat exchange tubes are arranged to form a polygonal structure.

4. The calcining equipment according to claim 3, characterized in that The plurality of heat exchange tubes in the circumferential direction are arranged to form a regular hexagon.

5. The calcining equipment according to claim 1, characterized in that The heat exchange tubes are arranged in multiple layers along the radial direction of the cylinder.

6. The calcining equipment according to claim 1, characterized in that The cylinder extends in a horizontal direction and is inclined relative to the horizontal direction, so that the feeding end of the cylinder is higher than the discharging end of the cylinder.

7. The calcining equipment according to claim 6, characterized in that The inclination angle of the cylinder is 1° to 3°.

8. The calcining equipment according to claim 1, characterized in that It also includes a partition plate disposed in the cylinder, wherein the partition plate divides the cylinder into a plurality of relatively independent cavities; The partition plate is provided with through holes for materials to pass through.

9. The calcining equipment according to claim 8, characterized in that It also includes a discharge plate connected to the partition plate, one end of which extends toward the through hole of the partition plate to guide the material to the through hole and pass through the partition plate.

10. The calcining equipment according to claim 9, characterized in that The partition plate is an annular plate, and the through hole is located in the middle of the partition plate; The discharge plate includes a connected shielding plate and a guide plate, wherein the shielding plate is fixed on the partition plate and extends radially along the partition plate to the through hole, and the guide plate extends axially along the partition plate and passes through the through hole to guide the material to pass through the through hole.

11. The calcining equipment according to claim 1, characterized in that Also included is a supporting device for supporting the cylinder.

12. The calcining equipment according to claim 11, characterized in that The supporting device comprises a base and two supporting wheels, and the two supporting wheels are rotatably mounted on the base; The two supporting wheels respectively abut against two sides of the bottom of the cylinder to support the cylinder.

13. The calcining device according to any one of claims 1 to 12, characterized in that: It also includes a power device for driving the cylinder to rotate.

14. The calcining device according to any one of claims 1 to 12, characterized in that: It also includes a material lifting plate arranged on the inner wall of the cylinder, and the material lifting plate extends along the radial direction of the cylinder.

15. The calcining device according to any one of claims 1 to 12, characterized in that: The cylinder is provided with an intermediate discharge port, and part of the material in the cylinder is discharged through the intermediate discharge port.

16. The calcining device according to any one of claims 1 to 12, characterized in that The calcining equipment is gypsum calcining equipment.

17. A calcining system, characterized in that: The calcining device comprises a feeder and the calcining device as claimed in any one of claims 1 to 16, wherein the outlet of the feeder is connected to the feed inlet.

18. The calcining system according to claim 17, characterized in that The feeder is provided with a wet material inlet and a return material inlet, and part of the material in the calcining equipment enters the feeder through the return material inlet; In the conveying direction of the material, the return material inlet is located upstream of the wet material inlet.

19. The calcining system according to claim 17, characterized in that: The feeder is a double-screw feeder.

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