CN116143433A - Calcination equipment and calcination system - Google Patents

Abstract

Disclosed herein are a calcination apparatus and a calcination system. The calcining equipment comprises a cylinder body and a heat exchange tube arranged in the cylinder body, wherein a feed inlet and a discharge outlet are arranged on the cylinder body, and the heat exchange tube is used for heating materials in the cylinder body; the heat exchange efficiency of the heat exchange tube at the tube sections at different positions along the length direction of the cylinder body is different. The calcination equipment disclosed herein achieves differential drying and calcination of materials at different positions by adjusting the heat exchange efficiency of the heat exchange pipes at different positions in length, avoids the situation that the calcination of the materials cannot be controlled or is difficult to control in the whole calcination process, facilitates the adjustment of calcination parameters according to different conditions of the materials, so as to obtain stable and high-quality gypsum powder, and is beneficial to improving the final quality of gypsum finished products.

Description

Calcination equipment and calcination system

Technical Field

The present application relates to the field of gypsum board production equipment, and in particular to a calcination apparatus and calcination system.

Background

In the process of calcining gypsum, coal-fired furnaces are becoming smaller and smaller with the increasing environmental requirements. And natural gas is used as a heat source, so that the cost is high. Accordingly, steam calcination processes are increasingly widespread. The steam rotary kiln is characterized in that the drying and the calcination of materials are completed in the same equipment, so that the process is simple and compact, and the steam rotary kiln becomes the mainstream gradually. However, in such calcination equipment of the steam rotary kiln, there are often cases of material overburning, especially local overburning, and cases of insufficient gypsum drying and insufficient calcination, and the calcination quality is unstable, which affects the quality of the final gypsum product.

Disclosure of Invention

The embodiment of the application provides calcination equipment and a calcination system, which have good drying and calcination effects on materials, and can effectively avoid the conditions of overburning, insufficient calcination and the like.

The embodiment of the application provides calcining equipment, which comprises a barrel and a heat exchange tube arranged in the barrel, wherein a feed inlet and a discharge outlet are arranged on the barrel, and the heat exchange tube is used for heating materials in the barrel;

the heat exchange efficiency of the heat exchange tube at the tube sections at different positions along the length direction of the cylinder body is different.

In an exemplary embodiment, 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.

In an exemplary embodiment, the second pipe section is provided with spiral fins on the outer side, and the third pipe section is sleeved with a sleeve on the outer side.

In an exemplary embodiment, the heat exchange tubes are disposed in plurality in the circumferential direction of the cylinder, and the plurality of heat exchange tubes are enclosed to form a polygonal structure.

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

In an exemplary embodiment, the heat exchange tube is provided with a plurality of layers in a radial direction of the cylinder.

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

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

In an exemplary embodiment, the calcination apparatus further includes a partition plate disposed within the cylinder, the partition plate dividing the cylinder into a plurality of relatively independent cavities;

and through holes for passing materials are formed in the partition plates.

In an exemplary embodiment, the calcination apparatus further includes a discharge plate connected to the separation plate, one end of the discharge plate extending toward the through hole of the separation plate to guide the material to the through hole and through the separation plate.

In an exemplary embodiment, the separation plate is an annular plate, and the via hole is located at a middle position of the separation plate;

the discharging plate comprises a shielding plate and a guide plate which are connected, the shielding plate is fixed on the separation plate and extends to the through hole along the radial direction of the separation plate, and the guide plate extends along the axial direction of the separation plate and penetrates through the through hole so as to guide materials to penetrate through the through hole.

In an exemplary embodiment, the calcination apparatus further comprises a support device supporting the cylinder.

In an exemplary embodiment, the support device includes a base and two support wheels rotatably mounted on the base;

the two supporting wheels respectively support two sides of the bottom of the cylinder body so as to support the cylinder body.

In an exemplary embodiment, the calcination apparatus further includes a power device to rotate the cylinder.

In an exemplary embodiment, the calcination apparatus further includes a lifter plate disposed on an inner wall of the cylinder, the lifter plate extending in a radial direction of the cylinder.

In an exemplary embodiment, an intermediate discharge opening is provided in the barrel, through which a portion of the material in the barrel is discharged.

In an exemplary embodiment, the calcination apparatus is a gypsum calcination apparatus.

The embodiment of the application also provides a calcining system, which comprises a feeder and the calcining equipment, wherein an outlet of the feeder is communicated with the feeding port.

In an exemplary embodiment, the feeder is provided with a wet material inlet and a return material inlet, and part of materials in the calcination equipment enter the feeder through the return material inlet;

the return inlet is located upstream of the wet inlet in the conveying direction of the material.

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

Compared with some technologies, the application has the following beneficial effects:

according to the calcination equipment provided by the embodiment of the application, the heat exchange efficiency of the heat exchange pipes at different positions in length is adjusted so as to differentially dry and calcine materials at different positions, the situation that the calcination of the materials cannot be controlled or is difficult to control in the whole calcination process is avoided, the calcination parameters are conveniently adjusted according to different conditions of the materials, stable and high-quality gypsum powder is obtained, and the final quality of gypsum finished products is improved.

The calcination system provided by the embodiment of the application has the calcination equipment, and the production is efficient and stable, and the gypsum product quality is high.

Additional features and advantages of the application will be set forth in the description which follows.

Drawings

The accompanying drawings are included to provide a further understanding of the technical aspects of the present application, and are incorporated in and constitute a part of this specification, illustrate the technical aspects of the present application and together with the examples of the present application, and not constitute a limitation of the technical aspects of the present application.

FIG. 1 is a schematic view of a calcining apparatus according to an embodiment of the present application;

FIG. 2 is a schematic view showing a partial structure of a calcining apparatus according to an embodiment of the present application;

FIG. 3 is a schematic diagram showing a partial structure of a calcining apparatus according to an embodiment of the present application;

FIG. 4 is a schematic view of a part of a calcining apparatus according to an embodiment of the present application;

FIG. 5 is a schematic view showing a partial structure of a calcining apparatus according to an embodiment of the present application;

FIG. 6 is a schematic view showing a partial structure of a calcining apparatus according to an embodiment of the present application;

FIG. 7 is a cross-sectional view A-A of FIG. 1;

FIG. 8 is a cross-sectional view B-B of FIG. 1;

FIG. 9 is a schematic view of the structure of the separator plate and the outfeed plate according to the embodiment of the present application;

fig. 10 is a schematic structural view of a discharge plate according to an embodiment of the present disclosure;

fig. 11 is a schematic structural diagram of a discharge plate according to an embodiment of the present disclosure;

fig. 12 is a schematic structural view of a second pipe section and a third pipe section according to an embodiment of the present application.

Illustration of:

1-cylinder, 11-feed inlet, 12-middle discharge outlet, 121-middle return inlet, 122-discharge outlet, 13-discharge outlet, 131-tail return inlet, 14-heat exchange tube, 141-first tube segment, 142-second tube segment, 143-third tube segment, 144-spiral fin, 145-sleeve, 15-partition plate, 151-mounting hole, 152-through hole, 16-sleeve tube, 17-discharge plate, 171-baffle plate, 172-guide plate, 173-convex edge, 18-lifting plate, 191-noncondensable gas discharge valve, 192-steam inlet, 193-condensed water outlet, 2-supporting device, 21-mounting platform, 3-power device, 4-feeder, 41-return inlet, 42-wet material inlet, 43-wet gas outlet, 44-rotating shaft and 45-blade.

Detailed Description

For the purposes of making the objects, technical solutions and advantages of the present application more apparent, embodiments of the present application will be described in detail hereinafter with reference to the accompanying drawings. It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be arbitrarily combined with each other.

For the current overburning condition, the calcination temperature is generally reduced or the residence time of the materials in the rotary kiln is reduced, but other problems are easily caused by the above methods, such as: reducing the calcination temperature can affect the calcination efficiency, reduce the calcination effect, and cause the problems of high humidity of gypsum powder, and the like; reducing the residence time of the material in the rotary kiln can also lead to insufficient drying and calcination of the gypsum powder, and the like, affecting the quality of the final gypsum product.

The embodiment of the application provides a calcining device, as shown in fig. 1 to 12, the calcining device comprises a cylinder 1 and a heat exchange tube 14 arranged in the cylinder 1, a feed inlet 11 and a discharge outlet 13 are arranged on the cylinder 1, and the heat exchange tube 14 is used for heating materials in the cylinder 1; the heat exchange efficiency of the heat exchange tube 14 is different at tube sections at different positions along the length direction of the cylinder 1.

The following description will be made with gypsum as the calcined material.

The gypsum powder is dried and calcined in the cylinder body 1, and the water in the gypsum powder is removed to form powder meeting the requirements and enters subsequent production equipment. The materials in the feeder 4 enter the cylinder 1 through the feed inlet 11, and the calcined gypsum powder in the cylinder 1 is discharged to the subsequent production equipment through the discharge outlet 13 (namely the tail discharge outlet 122).

The heat exchange tube 14 is arranged in the cylinder body 1, and high-temperature steam is introduced into the heat exchange tube 14 so as to facilitate heat exchange of the gypsum powder, and the gypsum powder is dried and calcined to remove water in the gypsum powder. The length direction of the heat exchange tube 14 is consistent with the length direction of the cylinder 1, namely, the heat exchange tube 14 extends along the axial direction of the cylinder 1 so as to dry and calcine gypsum powder in the whole cylinder 1.

The heat exchange efficiency of the heat exchange tube 14 at different positions is adjusted according to the actual requirements and the calcination experience so as to solve the problems of over-calcination, insufficient calcination and the like.

According to the calcination equipment provided by the embodiment of the application, the heat exchange efficiency of the heat exchange tube 14 at different positions in length is adjusted so as to differentially dry and calcine materials at different positions, the situation that the calcination of the materials cannot be controlled or is difficult to control in the whole calcination process is avoided, the calcination parameters are conveniently adjusted according to different conditions of the materials, stable and high-quality gypsum powder is obtained, and the final quality of gypsum finished products is improved.

In an exemplary embodiment, as shown in fig. 1 to 6, 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 of the tube body 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.

In the process of calcining gypsum powder, the problem of overburning is more common and needs to be treated with emphasis.

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

Of the three tube sections, the heat exchange efficiency of the second tube is highest, the heat exchange efficiency at the third tube section 143 is lowest, and the heat exchange efficiency at the first tube section 141 is centered. 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 higher heat exchange efficiency. After the gypsum powder is sufficiently 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 higher heat exchange efficiency and sufficiently calcines the gypsum powder to remove moisture in the gypsum powder. The heat exchange efficiency of the second pipe section 142 is higher than that of the first pipe section 141, so that energy waste can be avoided, and the first pipe section 141 mainly plays roles of preheating, drying and the like on gypsum powder, and does not need higher 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, so that the calcining effect of the gypsum powder at the second pipe section 142 is improved, and the heat of the steam is fully utilized. The heat exchange efficiency is reduced at the subsequent third pipe section 143, the overfiring of the gypsum powder is avoided, the calcination quality of the gypsum powder is ensured, and the consumption of steam heat is reduced.

Corresponding to steam calcination, the calcination apparatus may further be provided with: a non-condensable gas discharging valve 191 for discharging non-condensable gas; a steam inlet 192 for introducing steam; a condensed water outlet 193 for discharging condensed water as shown in fig. 2.

In an exemplary embodiment, as shown in fig. 2 to 5 and 12, the second pipe section 142 is provided with a spiral fin 144 at the outer side, and the third pipe section 143 is sleeved with a sleeve 145 at the outer side. Fig. 12 is a partial enlarged view of the junction of the second pipe section 142 and the third pipe section 143 to clearly show the structure at the second pipe section 142 and the third pipe section 143 in the other drawings.

The outer side of the first pipe section 141 may be free of other members, i.e., the outer side of the first pipe section 141 is a smooth wall surface. The outer side of the second tube section 142 is provided with left and right spiral fins 144 to improve the heat exchange efficiency at the second tube section 142, and of course, the outer side of the second tube section 142 may be provided with other structures for enhancing heat exchange, such as: grid plate fins, etc., to provide higher heat exchange efficiency at the second tube segment 142 than at the first tube segment 141. The sleeve 145 is arranged outside the third pipe section 143 to obstruct the heat exchange between the steam and the gypsum powder in the third pipe section 143, so that the heat exchange efficiency of the third pipe section 143 is lower than that of the first pipe section 141.

It should be appreciated that there are various ways of adjusting the heat exchange efficiency at the first tube segment 141, the second tube segment 142 and the third tube segment 143, and that other structures may be used, such as: suitably reducing the wall thickness at the second tube segment 142 to increase the heat exchange efficiency at the second tube segment 142; the wall thickness at the third tube section 143 is suitably increased to reduce the heat exchange efficiency at the third tube section 143, which is not limited in this application.

In an exemplary embodiment, as shown in fig. 8, the heat exchange tubes 14 are provided in plurality in the circumferential direction of the cylinder 1, and the plurality of heat exchange tubes 14 are enclosed to form a polygonal structure.

The heat exchange tube 14 is fixedly arranged in the cylinder 1 and rotates together with the cylinder 1. In the rotation process, in order to avoid the circulation of the gypsum powder in the cylinder 1, the heat exchange tubes 14 are arranged in a polygonal shape, so that the heat exchange tubes 14 can play a role in scattering the gypsum powder in the rotation process. In other words, the heat exchange tubes 14 are arranged in a non-circular manner, and impact can be generated with the heat exchange tubes 14 in the process of forming circulation of the gypsum powder, the heat exchange tubes 14 can prevent the gypsum powder from forming circulation, and then the drying and calcining effects of the heat exchange tubes 14 on the gypsum powder are ensured.

It should be appreciated that there are various ways in which the heat exchange tube 14 may be enclosed to form a polygonal structure, such as: 4 heat exchange tubes 14 are arranged at four vertex angle positions of the quadrangle respectively so as to form the quadrangle in a surrounding way. Alternatively, as follows: 8 heat exchange tubes 14 are arranged, and every 2 heat exchange tubes 14 are a group of edges forming a quadrangle so as to be enclosed to form the quadrangle. The specific number of heat exchange tubes 14 described above is by way of example only and is not necessarily the number of heat exchange tubes 14 required in the present application.

Of course, the heat exchange tubes 14 may be arranged in other forms, such as: oval, semi-circular, etc., as this application is not limited in this regard.

Specifically, as shown in fig. 8, the plurality of heat exchange tubes 14 in the circumferential direction may be surrounded to form a regular hexagon.

In an exemplary embodiment, as shown in fig. 8, the heat exchange tube 14 is provided with a plurality of layers in the radial direction of the cylinder 1.

The heat exchange tubes 14 are arranged in the radial direction to increase the number of the heat exchange tubes 14, effectively remove the moisture in the gypsum powder, and improve the drying and calcining effects of the heat exchange tubes 14 on the gypsum powder.

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

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

In an exemplary embodiment, as shown in fig. 1, the cylinder 1 extends in a horizontal direction and is disposed obliquely with respect to the horizontal direction, so that the feeding end of the cylinder 1 is higher than the discharging end of the cylinder 1.

The whole body is arranged along the approximately horizontal direction and slightly inclines downwards, namely, the feeding end of the cylinder body 1 is higher than the discharging end of the cylinder body 1, so that the gypsum board powder can move towards the discharging end of the cylinder body 1.

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

The inclination angle of the cylinder body 1 is set to be between 1 and 3 degrees, so that the phenomenon that the gypsum powder moves too fast to be calcined insufficiently due to the overlarge inclination angle is avoided, and meanwhile, the phenomenon that the movement of the gypsum powder cannot be effective due to the overlarge inclination angle can be avoided.

In practical application, the inclination angle of the cylinder 1 may be set to 1.15 °.

In an exemplary embodiment, as shown in fig. 4 and 9, the calcination apparatus further includes a partition plate 15 disposed within the cylinder 1, the partition plate 15 dividing the cylinder 1 into a plurality of relatively independent cavities; the partition plate 15 is provided with a through hole 152 for passing the material.

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

Mounting holes 151 through which the heat exchange tubes 14 pass may be provided on the partition plate 15, and the heat exchange tubes 14 extend in the axial direction of the cylinder 1 through the mounting holes 151. The partition plate 15 has certain supporting and fixing functions on the heat exchange tube 14, avoids the conditions of loosening, shaking and the like of the heat exchange tube 14 in the process of rotating along with the cylinder 1, and ensures 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 from being easily damaged at the mounting hole 151.

The interior of the cylinder body 1 is divided into a plurality of cavities, so that the situation that gypsum powder enters the cylinder body 1 and then rapidly reaches a discharge end and insufficient calcination of the gypsum powder is avoided. In other words, the partition plate 15 has a certain blocking effect on the gypsum powder, and the gypsum powder is carried up and scattered by the cylinder 1 which rotates after being blocked by the partition plate 15, so that the gypsum powder is uniformly distributed in the cylinder 1 as much as possible and fully contacts with the heat exchange tube 14, and is fully heated and calcined; the gypsum powder uniformly distributed in the cavity will gradually pass through the via 152 to the next cavity.

In practical application, the number of the partition plates 15 may be two, one is arranged at the middle position in the axial direction of the cylinder 1, and one is arranged at the position of the tail discharge port 13, so that the space in the cylinder 1 is divided into three relatively independent spaces.

In an exemplary embodiment, as shown in fig. 4, 9, 10 and 11, the calcination apparatus further includes a discharge plate 17 connected to the separation plate 15, and one end of the discharge plate 17 extends toward the through hole 152 of the separation plate 15 to guide the material to the through hole 152 and through the separation plate 15.

The discharge plate 17 can provide a guide to facilitate the passage of the broken up gypsum powder through the through holes 152. The gypsum powder falling on the discharge plate 17 slides to the position of the through hole 152 along the extending direction of the discharge plate 17, and then passes through the through hole 152 to enter the next cavity.

In practical application, the discharging plate 17 not only can be connected with the partition plate 15, but also can be connected with the inner wall of the cylinder body 1, and further the discharging plate 17 can also play a role in improving the strength of the partition plate 15, so that the partition plate 15 is ensured to be fixed and reliable, and the gypsum powder can still be kept firm in the long-term flushing process of the gypsum powder.

The discharge plate 17 may be provided in plurality and uniformly arranged in the circumferential direction of the cylinder 1 to improve the material guiding effect of the discharge plate 17 and the reinforcing effect of the partition plate 15.

In an exemplary embodiment, as shown in fig. 9, the partition plate 15 is an annular plate, and the through hole 152 is located at a middle position of the partition plate 15; the discharge plate 17 includes a shielding plate 171 and a guide plate 172 connected to each other, the shielding plate 171 being fixed to the partition plate 15 and extending to the through hole 152 in the radial direction of the partition plate 15, the guide plate 172 extending in the axial direction of the partition plate 15 and passing through the through hole 152 to guide the material passing through the through hole 152.

The partition plate 15 is an annular plate, and the mounting holes 151 through which the heat exchange tubes 14 pass are circumferentially arranged in the annular plate, and the through holes 152 are circular holes in the middle of the annular plate.

As shown in fig. 10 and 11, the shielding plate 171 and the guide plate 172 are located on the same plane (radial surface), perpendicular to the rotational direction of the cylinder 1, and perpendicular to the partition plate 15. The shielding plate 171 has one end extending to the inner wall of the cylinder 1 and the other end extending radially to the through hole 152 to guide the gypsum powder to the through hole 152. The guide plate 172 extends in the axial direction inside the cylinder 1 and has one end thereof 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 so as to guide gypsum powder through the through hole 152.

Raised edges 173 may be provided on both the shielding plate 171 and the guide plate 172 to drop out the gypsum powder falling on the shielding plate 171 and the guide plate 172.

In an exemplary embodiment, as shown in fig. 1, 3 and 5, the calcination apparatus further comprises a support device 2 supporting the cylinder 1.

The supporting means 2 is used to support the cylinder 1 to fix the cylinder 1 at a desired height and a desired inclination angle.

The supporting means 2 may be provided in plural, supporting the cylinder 1 at plural positions in the axial direction of the cylinder 1. In practical applications, the number of the supporting devices 2 may be two, and the supporting devices are divided into upstream and downstream of the cylinder 1, namely, near the positions of the feed inlet 11 and the discharge outlet 13. And the height of the supporting means 2 located downstream is lower than the height of the supporting means 2 located upstream so that the cylinder 1 maintains an inclination angle of 1.15 deg..

In an exemplary embodiment, the support device 2 comprises a base and two support wheels (not shown in the figures), both of which are rotatably mounted on the base; the two supporting wheels respectively prop against two sides of the bottom of the cylinder body 1 to support the cylinder body 1.

The supporting wheel is rotatably fixed on the base and is contacted with the cylinder body 1. While the supporting wheel provides supporting force, the rotation of the cylinder body 1 is not hindered. When the cylinder 1 rotates, the supporting wheel rotates along with the cylinder 1.

In an exemplary embodiment, as shown in fig. 1 and 3, the calcination apparatus further includes a power device 3 that drives the cylinder 1 to rotate.

The power device 3 provides power for the rotation of the cylinder 1.

The power device 3 and the cylinder body 1 can be driven in various modes such as belt drive and gear drive, and the power device 3 can also select different forms of driving motors according to actual needs, and the driving motors are not repeated here.

In practical application, the supporting devices 2 are mounted on the mounting platforms 21, and when the number of the supporting devices 2 is two, the number of the mounting platforms 21 is also two. The power unit 3 may be provided on the same mounting platform 21 as one of the support units 2.

In an exemplary embodiment, as shown in fig. 2, 3 and 5, the calcination apparatus further includes a lifter plate 18 provided on the inner wall of the cylinder 1, the lifter plate 18 extending in the radial direction of the cylinder 1.

The lifting blades 18 are used for lifting and scattering the gypsum powder. In the process of rotating the cylinder 1, the gypsum powder can rotate along with the cylinder, and circulation is easy to form. The material lifting plate 18 is arranged on the inner wall of the cylinder body 1 to scatter gypsum powder, so that the gypsum powder is prevented from forming circulation, and the gypsum powder is fully heat-exchanged with the heat exchange tube 14 to be fully heated and calcined.

The lifting blades 18 are arranged in a plurality along the axial direction and the circumferential direction of the cylinder body 1 and are uniformly arranged so as to improve the lifting effect and fully scatter gypsum powder.

In an exemplary embodiment, as shown in fig. 4, an intermediate discharge opening 12 is provided in the cylinder 1, and a part of the material in the cylinder 1 is discharged through the intermediate discharge opening 12.

In practical application, a plurality of discharge openings 122 can be arranged in the circumferential direction of the cylinder body 1, and a feed back valve is arranged at each discharge opening 122. An annular sealing cover is sleeved outside the cylinder 1, is fixed and is in movable sealing with the cylinder 1, so that materials discharged by a plurality of discharge valves are guided to the middle discharge opening 12 and discharged to other production equipment (such as a feeder 4 positioned at the upstream of the cylinder 1).

In addition, an intermediate air return port 121 for blowing in the preheating air may be further provided on the cylinder 1, and the intermediate air return port 121 and the intermediate discharge port 12 are located at the same axial position of the cylinder 1. The heat is fully utilized in the calcination process, and the micro positive pressure at the middle discharge opening 12 is ensured, so that the discharge is convenient; the barrel 1 can be further provided with a tail air return port 131 for blowing in the preheating air, and the tail air return port 131 and the tail discharge port 122 (namely the discharge port 13) are positioned at the same axial position of the barrel 1. The heat is fully utilized in the calcination process, and the micro positive pressure at the tail discharge opening 122 is ensured, so that the discharging is facilitated.

In an exemplary embodiment, the calcination apparatus is a gypsum calcination apparatus, such as: and (5) a rotary kiln.

Of course, the calcining apparatus provided in the embodiments of the present application may also be used to calcine other materials, and is not limited to gypsum.

The calcination equipment provided by the embodiment of the application is stable, efficient and energy-saving, the calcination equipment is provided with the middle discharge opening 12, part of the recycled materials are fed back to the double-screw feeder, and in the double-screw feeder, the recycled dry gypsum powder is added first, and then the wet desulfurized gypsum raw material is added. The dry gypsum powder added firstly avoids the direct contact between the wet desulfurization gypsum raw material and equipment, and the free water content in the dry gypsum powder of the recycled material is very low, so that the wet desulfurization gypsum raw material hardly has chemical corrosion to the equipment; meanwhile, because the temperature of the return material is higher (about 110 ℃), the wet desulfurization gypsum raw material is heated in a double-screw feeder and is stirred and mixed with the double-screw feeder, so that the drying of the desulfurization gypsum raw material is accelerated; the double-screw feeder adopts double-shaft opposite rotation stirring, and the blades 45 are uniformly and obliquely arranged to ensure uniform mixing of dry and wet materials; the calcining equipment feeding end heating pipeline and the bracket adopt corrosion resistance (Cl) ^- ，SO4 ^2- Plasma) better performing duplex stainless steel 2205/2507; the above measures greatly reduce the corrosion of the double screw feeder and the calcining equipment. Meanwhile, the moisture outlet 43 is arranged on the high-humidity side of the feed inlet 11, so that generated water vapor can be discharged in time, high-humidity gas is prevented from penetrating through the calcining equipment, corrosion to the calcining equipment is reduced, and the calcining quality is optimized. The preheating wind blows into the calcining equipment from the middle air return opening 121 and the tail air return opening 131, thereby not only fully utilizing heat, but also reducing the humidity of the atmosphere at the upper part of the calcining equipment, reducing the corrosion of the calcining equipment and the subsequent dust collecting equipment, and simultaneously ensuring the middle partThe middle discharging opening 12 and the tail discharging opening 122 are slightly positive in pressure, so that discharging is facilitated. The heat exchange tube 14 adopts a light pipe near the feeding end, a spiral fin 144 is arranged at the middle section, and a sleeve 145 is arranged at the discharging end. Because the wet material has certain viscosity, the light pipe is adopted at the feeding end, so that the wet material can be effectively prevented from adhering to the outer wall of the pipe, the spiral fins 144 are adopted at the middle section, the heat exchange area is increased, the heat exchange intensity is improved, the sleeve 145 is arranged at the discharging end, the heat transfer can be effectively weakened, and the material overburning is avoided. The middle discharge opening 12 and the tail discharge opening 122 are provided with a partition plate in front, so that the calcining equipment is divided into a plurality of calcining areas, the zoned calcining is realized, the calcining quality is ensured, and meanwhile, the effective volume of each calcining area is ensured. The lifting blades 18 are uniformly and spirally arranged along the inner wall of the cylinder body 1 and rotate along with the cylinder body 1 to lift the material clung to the inner wall, so that the material is prevented from sliding along the inner wall to form circulation, and the calcination uniformity is prevented from being influenced. Meanwhile, the heat exchange tubes 14 are arranged in a regular polygon (non-circular shape), and in the rotation process of the cylinder body 1, the heat exchange tubes 14 stir and scatter materials, so that calcination is more uniform.

The embodiment of the application also provides a calcining system, which comprises the feeder 4 and the calcining equipment, wherein an outlet of the feeder 4 is communicated with the feeding port 11.

The calcination system provided by the embodiment of the application has the calcination equipment, and the production is efficient and stable, and the gypsum product quality is high.

In an exemplary embodiment, as shown in fig. 6, a wet material inlet 42 and a return material inlet 41 are arranged on the feeder 4, and part of materials in the calcination equipment enter the feeder 4 through the return material inlet 41; the return inlet 41 is located upstream of the wet inlet 42 in the conveying direction of the material.

The middle part of the calcining equipment is fed back to the feeder 4, and in the feeder 4, the dry gypsum powder of the fed back is added first, and then the wet desulfurized gypsum raw material is added. The dry gypsum powder added firstly avoids the direct contact between the wet desulfurization gypsum raw material and equipment, and the free water content in the dry gypsum powder of the recycled material is very low, so that the wet desulfurization gypsum raw material hardly has chemical corrosion to the equipment; meanwhile, because the temperature of the return material is higher (about 110 ℃), the wet desulfurization gypsum raw material is heated in the feeder 4 and is stirred and mixed with the wet desulfurization gypsum raw material, so that the drying of the desulfurization gypsum raw material is quickened; the corrosion of the feeder 4 and the calcination equipment is greatly reduced.

The feed back inlet 41 of the intermediate feed back on the feeder 4 is positioned before the wet feed inlet 42 of the gypsum raw material on the feeder 4 to ensure that the feeder 4 is not corroded by the gypsum raw material (or to greatly reduce the degree of corrosion of the gypsum raw material to the feeder 4, etc.). Of course, the return inlet 41 of the intermediate return on the feeder 4 may also be the same inlet as the wet inlet 42 of the gypsum raw material on the feeder 4 (i.e., the intermediate return enters the feeder 4 at the same inlet 11 as the gypsum raw material).

In addition, a moisture outlet 43 is provided on the feeder 4, the moisture outlet 43 being located downstream of the moisture inlet 42 for discharging system moisture, from where the moisture in the feeder 4 and calcination apparatus is discharged.

In an exemplary embodiment, feeder 4 is a double screw feeder.

The double-screw feeder is used for fully mixing the raw materials and the return materials and sending the mixture into the rotary kiln, and has the effects of material conveying and material scattering.

The vanes 45 in the twin screw feeder may take the form of discontinuous helical vanes 45. The continuous spiral blade 45 has high conveying efficiency, but gypsum powder is easy to agglomerate in the conveying process, which is unfavorable for the subsequent drying and calcining process of the gypsum powder. In the double-screw feeder in the embodiment of the application, the blades 45 are arranged into a plurality of discontinuous blades, and the blades 45 are radially arranged on the rotating shaft 44 of the double-screw feeder and are obliquely arranged along the axial direction so as to generate axial thrust to materials in the rotating process of the blades 45. The blades 45 rotate to push the materials to advance and have a certain scattering effect on the materials, so that the gypsum powder is prevented from caking in the conveying process.

In the description of the present application, it should be noted that the directions or positional relationships indicated by "upper", "lower", "one end", "one side", etc. are based on the directions or positional relationships shown in the drawings, and are merely for convenience of description of the present application and simplification of the description, and are not indicative or implying that the structure referred to has a specific direction, is configured and operated in a specific direction, and therefore, should not be construed as limiting the present application.

In the description of the embodiments of the present application, unless explicitly specified and limited otherwise, the terms "connected," "assembled," and "mounted" are to be construed broadly, and for example, the term "connected" may be a fixed connection, a removable connection, or an integral connection; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.

The embodiments described herein are intended to be illustrative and not limiting, and it will be apparent to those of ordinary skill in the art that many more embodiments and implementations are possible within the scope of the embodiments described herein. Although many possible combinations of features are shown in the drawings and discussed in the detailed description, many other combinations of the disclosed features are possible. Any feature or element of any embodiment may be used in combination with or in place of any other feature or element of any other embodiment unless specifically limited.

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 this application may also be combined with any conventional features or elements to form a unique solution as defined by the claims. Any feature or element of any embodiment may also be combined with features or elements from other claims to form another unique claim as defined in the claims. Thus, it should be understood that any of the features shown and/or discussed in this application may be implemented alone or in any suitable combination. Accordingly, the embodiments are not to be restricted except in light of the attached claims and their equivalents. Further, various modifications and changes may be made within the scope of the appended claims.

Claims (20)

1. The calcining equipment is characterized by comprising a barrel and a heat exchange tube arranged in the barrel, wherein a feed inlet and a discharge outlet are formed in the barrel, and the heat exchange tube is used for heating materials in the barrel;

the heat exchange efficiency of the heat exchange tube at the tube sections at different positions along the length direction of the cylinder body is different.

2. The calcination apparatus according to claim 1, wherein 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 being greater than the heat exchange efficiency at the first tube section, the heat exchange efficiency at the third tube section being less than the heat exchange efficiency at the first tube section.

3. The calcination apparatus according to claim 2, wherein the second pipe section is provided with helical fins on the outside and the third pipe section is sleeved with a sleeve on the outside.

4. The calcination apparatus according to claim 1, wherein the heat exchange tubes are provided in plurality in the circumferential direction of the cylinder, and a plurality of the heat exchange tubes are enclosed to form a polygonal structure.

5. The calcination apparatus according to claim 4, wherein a plurality of the heat exchange tubes in the circumferential direction are surrounded to form a regular hexagon.

6. Calcination apparatus according to claim 1, wherein the heat exchange tube is provided with a plurality of layers in the radial direction of the cylinder.

7. The calcination apparatus according to claim 1, wherein the cylinder extends in a horizontal direction and is disposed obliquely with respect to the horizontal direction such that a feed end of the cylinder is higher than a discharge end of the cylinder.

8. The calcination apparatus according to claim 7, wherein the inclination angle of the cylinder is 1 ° to 3 °.

9. The calcination apparatus according to claim 1, further comprising a partition plate disposed within the cylinder, the partition plate dividing the cylinder into a plurality of relatively independent cavities;

and through holes for passing materials are formed in the partition plates.

10. The calcination apparatus of claim 9, further comprising a discharge plate connected to the separation plate, one end of the discharge plate extending toward the through hole of the separation plate to guide the material to the through hole and through the separation plate.

11. Calcination apparatus according to claim 10, wherein the separation plate is an annular plate, the via being located in a middle position of the separation plate;

the discharging plate comprises a shielding plate and a guide plate which are connected, the shielding plate is fixed on the separation plate and extends to the through hole along the radial direction of the separation plate, and the guide plate extends along the axial direction of the separation plate and penetrates through the through hole so as to guide materials to penetrate through the through hole.

12. The calcination apparatus of claim 1, further comprising a support device that supports the cylinder.

13. The calcination apparatus according to claim 12, wherein the support means comprises a base and two support wheels, both of the support wheels being rotatably mounted on the base;

the two supporting wheels respectively support two sides of the bottom of the cylinder body so as to support the cylinder body.

14. The calcination apparatus of any one of claims 1 to 13 further comprising a power device that rotates the cylinder.

15. The calcination apparatus according to any one of claims 1 to 13, further comprising a lifter plate provided on an inner wall of the cylinder, the lifter plate extending in a radial direction of the cylinder.

16. Calcination apparatus according to any one of claims 1 to 13 wherein the barrel is provided with an intermediate discharge opening through which part of the material in the barrel is discharged.

17. The calcination apparatus according to any one of claims 1 to 13, wherein the calcination apparatus is a gypsum calcination apparatus.

18. A calcination system comprising a feeder and a calcination apparatus according to any one of claims 1 to 17, the outlet of the feeder being in communication with the feed inlet.

19. The calcination system according to claim 18, wherein the feeder is provided with a wet material inlet and a return material inlet, a portion of the material in the calcination apparatus entering the feeder through the return material inlet;

the return inlet is located upstream of the wet inlet in the conveying direction of the material.

20. The calcination system of claim 18, wherein the feeder is a double screw feeder.

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