CN116143433A - A kind of calcining equipment and calcining system - Google Patents

Abstract

This paper discloses a calcining device and a calcining system. The calcining equipment includes a cylinder body and a heat exchange tube arranged in the cylinder body, the cylinder body is provided with a material inlet and a material outlet port, and the heat exchange tube is used to heat the material in the cylinder body; the heat exchange tube The heat exchange efficiencies of the pipe sections at different positions along the length direction of the cylinder body are different. The calcination equipment disclosed in this paper adjusts the heat exchange efficiency of different positions of the heat exchange tube in order to achieve differentiated drying and calcination of materials at different positions, so as to avoid uncontrollable or difficult control of the calcination of materials during the entire calcination process , it is convenient to adjust the calcination parameters according to the different conditions of the materials, so as to obtain stable and high-quality gypsum powder, which is conducive to improving the final quality of gypsum products.

Description

A kind of calcining equipment and calcining system

technical field

The present application relates to but not limited to the field of gypsum board production equipment, especially a calcination equipment and a calcination system.

Background technique

In the calcination process of gypsum, with the improvement of environmental protection requirements, there are fewer and fewer coal-fired furnaces. However, natural gas is used as a heat source, and the cost is relatively high. Therefore, the steam calcination process is increasingly widespread. Steam rotary kiln has gradually become the mainstream because the drying and calcination of materials are completed in the same equipment, and the process is simple and compact. However, in calcination equipment such as steam rotary kiln, there are often cases of material overburning, especially partial overburning, and insufficient drying and calcination of gypsum. The calcination quality is unstable, which affects the quality of the final gypsum product.

Contents of the invention

The embodiment of the present application provides a calcining device and a calcining system, which have good effects on drying and calcining materials, and can effectively avoid over-calcination and insufficient calcining.

The embodiment of the present application provides a calcination equipment, the calcination equipment includes 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 for heating the material in the cylinder;

The heat exchange efficiencies of the tube sections at different positions along the length direction of the barrel of the heat exchange tube are 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, and the heat exchange efficiency at the second tube section is greater than that at the first tube section. The heat exchange efficiency of the third pipe section is lower than the heat exchange efficiency of the first pipe section.

In an exemplary embodiment, spiral fins are provided on the outside of the second pipe section, and sleeves are sleeved on the outside of the third pipe section.

In an exemplary embodiment, a plurality of heat exchange tubes are arranged in the circumferential direction of the barrel, and the plurality of heat exchange tubes are surrounded to form a polygonal structure.

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

In an exemplary embodiment, the heat exchange tubes are arranged in multiple layers along the radial direction of the barrel.

In an exemplary embodiment, the barrel extends along the horizontal direction and is arranged inclined relative to the horizontal direction, so that the feeding end of the barrel is higher than the discharging end of the barrel.

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

In an exemplary embodiment, the calcining equipment further includes a partition plate arranged in the cylinder, and the partition plate divides the cylinder into a plurality of relatively independent cavities;

Via holes for materials to pass are arranged on the partition plate.

In an exemplary embodiment, the calcining equipment further includes a discharge plate connected to the partition plate, one end of the discharge plate extends toward the through hole of the partition plate, so as to guide the material to the passage hole and through the divider.

In an exemplary embodiment, 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 baffle plate and a guide plate, the baffle plate is fixed on the partition plate and extends to the through hole along the radial direction of the partition plate, and the guide plate The axial extension of the partition plate passes through the through hole, so as to guide the material to pass through the through hole.

In an exemplary embodiment, the calcining equipment further includes a support device for supporting the barrel.

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

The two supporting wheels are respectively against the two sides of the bottom of the cylinder to support the cylinder.

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

In an exemplary embodiment, the calcining equipment further includes a lifting plate arranged on the inner wall of the cylinder, and the lifting plate extends along the radial direction of the cylinder.

In an exemplary embodiment, the barrel is provided with an intermediate discharge port, and part of the materials in the barrel are discharged through the intermediate discharge port.

In an exemplary embodiment, the calcination equipment is gypsum calcination equipment.

The embodiment of the present application also provides a calcination system, the calcination system includes a feeder and the aforementioned calcination equipment, and the outlet of the feeder communicates with the inlet.

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

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

In an exemplary embodiment, the feeder is a twin-screw feeder.

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

The calcination equipment provided in the embodiment of the present application adjusts the heat exchange efficiency of the heat exchange tube at different positions in the length to achieve differentiated drying and calcination of materials at different positions, so as to avoid uncontrollable or difficult control of the material during the entire calcination process. It is convenient to adjust the calcination parameters according to the different conditions of the materials, so as to obtain stable and high-quality gypsum powder, which is conducive to improving the final quality of gypsum products.

The calcining system provided in the embodiment of the present application has the aforementioned calcining equipment, and the production is efficient and stable, and the quality of the finished gypsum is high.

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

Description of drawings

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

Fig. 1 is a structural schematic diagram 1 of the calcining equipment described in the embodiment of the present application;

Fig. 2 is a partial structural schematic diagram 1 of the calcining equipment described in the embodiment of the present application;

Fig. 3 is a partial structural schematic diagram II of the calcining equipment described in the embodiment of the present application;

Fig. 4 is a partial structural schematic diagram III of the calcining equipment described in the embodiment of the present application;

Fig. 5 is a partial structural schematic diagram IV of the calcining equipment described in the embodiment of the present application;

Fig. 6 is a partial structural schematic diagram V of the calcining equipment described in the embodiment of the present application;

Fig. 7 is A-A sectional view among Fig. 1;

Fig. 8 is B-B sectional view among Fig. 1;

Fig. 9 is a schematic structural view of the partition plate and the discharge plate described in the embodiment of the present application;

Fig. 10 is a schematic diagram of the first structure of the discharge plate described in the embodiment of the present application;

Fig. 11 is the second structural schematic diagram of the discharge plate described in the embodiment of the present application;

Fig. 12 is a schematic structural view of the second pipe section and the third pipe section described in the embodiment of the present application.

Graphical description:

1-cylinder, 11-material inlet, 12-intermediate discharge port, 121-intermediate air return port, 122-discharge port, 13-discharge port, 131-tail return air port, 14-heat exchange tube, 141- First pipe section, 142-second pipe section, 143-third pipe section, 144-spiral fin, 145-sleeve, 15-partition plate, 151-installation hole, 152-through hole, 16-sleeve tube, 17 -Outlet plate, 171-shelter plate, 172-guide plate, 173-raised edge, 18-lift 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-moisture outlet, 44-rotating shaft, 45-blade.

Detailed ways

In order to make the purpose, technical solution and advantages of the application clearer, the embodiments of the application will be described in detail below in conjunction with the accompanying drawings. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined arbitrarily with each other.

For the current over-burning situation, it is generally avoided by reducing the calcination temperature or reducing the residence time of the material in the rotary kiln. However, the above-mentioned methods are likely to cause other problems, such as: lowering the calcination temperature will affect the calcination efficiency. And it will reduce the calcination effect, causing problems such as high humidity of the gypsum powder; reducing the residence time of the material in the rotary kiln will also lead to drying of the gypsum powder and insufficient calcination, which will affect the quality of the final gypsum product.

The embodiment of the present application provides a calcining equipment, as shown in Figure 1 to Figure 12, the calcining equipment includes a cylinder 1 and a heat exchange tube 14 arranged in the cylinder 1, the cylinder 1 is provided with a material inlet 11 and The discharge port 13 and the heat exchange tube 14 are used to heat the material in the cylinder body 1; the heat exchange efficiency of the heat exchange tube 14 at different positions along the length direction of the cylinder body 1 is different.

In the following, gypsum is used as the calcined material for illustration.

The gypsum powder is dried and calcined in the barrel 1, and the moisture 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 barrel 1 through the inlet 11, and the calcined gypsum powder in the barrel 1 is discharged to the subsequent production equipment through the outlet 13 (ie, the tail discharge port 122).

A heat exchange tube 14 is arranged inside the barrel 1, and high-temperature steam is introduced into the heat exchange tube 14 to facilitate the heat exchange of the gypsum powder, dry and calcinate the gypsum powder, and remove the moisture in the gypsum powder. The length direction of the heat exchange tube 14 is consistent with the length direction of the cylinder body 1 , that is, the heat exchange tube 14 extends along the axial direction of the cylinder body 1 so as to dry and calcinate the gypsum powder in the entire cylinder body 1 .

Adjust the heat exchange efficiency at different positions of the heat exchange tube 14 according to actual needs and calcination experience to deal with problems such as over-calcination and insufficient calcination.

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 in the length to achieve differentiated drying and calcination of materials at different positions, so as to avoid uncontrollable or difficult control of the entire calcination process. The calcination of the material is convenient to adjust the calcination parameters according to the different conditions of the material, so as to obtain stable and high-quality gypsum powder, which is conducive to improving the final quality of the gypsum product.

In an exemplary embodiment, as shown in FIGS. 1 to 6 , the heat exchange tube 14 includes a first tube section 141 , a second tube section 142 and a third tube section 143 along the length direction of the cylinder body 1 , and the heat exchange tube at the second tube section 142 The thermal efficiency is greater than the heat exchange efficiency at the first pipe section 141 , and the heat exchange efficiency at the third pipe section 143 is lower than the heat exchange efficiency at the first pipe section 141 .

During the calcination process of gypsum powder, the problem of over-burning is relatively common and needs to be dealt with emphatically.

The heat exchange tube 14 is sequentially provided with a first pipe section 141, a second pipe section 142 and a third pipe section 143 in the length direction. The first pipe section 141 is located upstream, close to the side of the feed inlet 11, and the third pipe section 143 is located downstream, near the discharge port. Port 13 side.

Among the three pipe sections, the heat exchange efficiency of the second pipe section 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 high 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 higher heat exchange efficiency, and is fully calcined to remove the gypsum powder. of moisture. The heat exchange efficiency of the second pipe section 142 is higher than that of 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 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, improving the calcination effect of the gypsum powder at the second pipe section 142, and making full use of the steam heat. The heat exchange efficiency is reduced at the subsequent third pipe section 143 to avoid over-burning of the gypsum powder, ensure the calcining quality of the gypsum powder, and reduce the consumption of steam heat at the same time.

Corresponding to steam calcination, the calcination equipment can also be equipped with: non-condensable gas discharge valve 191, used to discharge non-condensable gas; steam inlet 192, used to feed steam; condensed water outlet 193, used to discharge condensed water, as shown in Figure 2 shown.

In an exemplary embodiment, as shown in FIG. 2 to FIG. 5 and FIG. 12 , spiral fins 144 are provided on the outside of the second pipe section 142 , and a sleeve 145 is sleeved on the outside of the third pipe section 143 . FIG. 12 is a partially enlarged view of the connection of the second pipe section 142 and the third pipe section 143 to clearly show the structures at the second pipe section 142 and the third pipe section 143 in other drawings.

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. Left and right helical 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. Certainly, other structures for enhancing heat exchange can also be provided outside the second pipe section 142, such as grid plate fins, etc. So that the heat exchange efficiency at the second pipe section 142 is higher than that at the first pipe section 141 . A sleeve 145 is provided outside the third pipe section 143 to block 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 .

It should be understood that there are many ways to adjust the heat exchange efficiency at the first pipe section 141, the second pipe section 142 and the third pipe section 143, and it is not limited to the above-mentioned methods, and other structures can also be used, such as: appropriately lowering the The wall thickness at the second pipe section 142 is to improve the heat exchange efficiency at the second pipe section 142; the wall thickness at the third pipe section 143 is appropriately increased to reduce the heat exchange efficiency at the third pipe section 143, which is not limited by the present application .

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

The heat exchange tube 14 is fixedly arranged in the cylinder body 1 and rotates together with the cylinder body 1 . During the rotation process, in order to prevent the gypsum powder in the cylinder 1 from forming a circulation, a plurality of heat exchange tubes 14 are arranged in a polygonal shape, so that the heat exchange tubes 14 can play the role of 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 will collide with the heat exchange tubes 14 during the circulation process of the gypsum powder. Drying and calcining effect of powder.

It should be understood that there are many ways to enclose the heat exchange tubes 14 to form a polygonal structure. For example, four heat exchange tubes 14 are respectively located at the four vertices of the quadrangle to form a quadrangle. Or, for example: 8 heat exchange tubes 14 are provided, and every 2 heat exchange tubes 14 form a side of a 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.

Of course, the heat exchange tubes 14 may also be arranged in other forms, such as oval, semicircular, etc., which is not limited in the present application.

Specifically, as shown in FIG. 8 , a 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 tubes 14 are arranged in multiple layers along the radial direction of the cylinder body 1 .

Multi-layer heat exchange tubes 14 are provided in the radial direction to increase the number of heat exchange tubes 14, effectively remove moisture in the gypsum powder, and improve the drying and calcining effect 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.

There are multiple heat exchange tubes 14 in the radial direction or circumferential direction, and there is a certain gap between adjacent heat exchange tubes 14, and the gypsum powder is heated by the heat exchange tubes 14 through the gap, so as to obtain a good calcination effect.

In an exemplary embodiment, as shown in FIG. 1 , the cylinder body 1 extends along the horizontal direction and is arranged obliquely relative to the horizontal direction, so that the input end of the cylinder body 1 is higher than the discharge end of the cylinder body 1 .

The whole body is generally arranged along the horizontal direction and slightly inclined downward, that is, 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 to the discharging end of the cylinder body 1.

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

The inclination angle of the cylinder body 1 is set between 1° and 3°, so as to avoid excessive gypsum powder movement due to insufficient calcination due to too large inclination angle, and to avoid too small inclination angle that cannot affect the movement of gypsum powder. to the effect.

In practical applications, the inclination angle of the barrel 1 can be set to 1.15°.

In an exemplary embodiment, as shown in FIG. 4 and FIG. 9 , the calcining equipment further includes a partition plate 15 arranged in the cylinder body 1, and the partition plate 15 divides the cylinder body 1 into a plurality of relatively independent cavities. ; The partition plate 15 is provided with a via hole 152 for the material to pass through.

The partition plate 15 is used to separate the space in the cylinder body 1, divide the cylinder body 1 into a plurality of relatively independent cavities, realize partitioned calcination, ensure the quality of calcination, and ensure the effective volume of each calcination area (each cavity). The connected cavities are communicated through the via hole 152, and the gypsum powder enters the next cavity through the via hole 152 from the previous 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 pass through the mounting holes 151 and extend along the axial direction of the cylinder body 1 . The partition plate 15 has a certain supporting and fixing effect on the heat exchange tube 14, avoiding the loosening and shaking of the heat exchange tube 14 during the rotation of the cylinder body 1, and ensuring the normal and reliable operation of the calcining equipment. A sleeve tube 16 may be provided in the installation hole 151 to protect the heat exchange tube 14 and prevent the heat exchange tube 14 from being easily damaged at the installation hole 151 .

Dividing the cylinder body 1 into multiple cavities can effectively prevent the gypsum powder from quickly reaching the discharge end after entering the cylinder body 1, and avoid insufficient calcination of the gypsum powder. 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 lifted up and scattered by the rotating cylinder 1, so that the gypsum powder is distributed as evenly as possible in the cylinder 1. , fully in contact with the heat exchange tube 14, fully heated and calcined; the gypsum powder evenly distributed in the cavity will gradually enter the next cavity through the through hole 152.

In practical applications, the number of partition plates 15 can be set to two, one is set at the middle position in the axial direction of the cylinder body 1, and one is set at the position of the tail discharge port 13 to separate the space in the cylinder body 1. It is three relatively independent spaces.

In an exemplary embodiment, as shown in FIG. 4 , FIG. 9 , FIG. 10 and FIG. 11 , the calcining equipment also includes a discharge plate 17 connected to the partition plate 15 , and one end of the discharge plate 17 faces the partition plate 15 The through hole 152 extends to guide the material to the through hole 152 and pass through the partition plate 15 .

The discharge plate 17 can play a certain guiding role, so that the dispersed gypsum powder can pass through the through hole 152 more easily. 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 and enter the next cavity.

In practical application, the discharge plate 17 can not only be connected with the partition plate 15, but also can be connected with the inner wall of the cylinder body 1, and then the discharge plate 17 can also play the effect of improving the strength of the partition plate 15, ensuring that the partition plate 15 The fixing is reliable, and it can still remain firm during the long-term washing process of gypsum powder.

A plurality of discharge plates 17 can be provided, and are uniformly arranged along the circumferential direction of the cylinder body 1 , so as to improve the material guiding effect of the discharge plate 17 and the reinforcement effect on 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 in the middle of the partition plate 15; The plate 171 is fixed on the dividing plate 15 and extends to the through hole 152 along the radial direction of the dividing plate 15, and the guide plate 172 extends along the axial direction of the dividing plate 15 and passes through the through hole 152, so as to guide the material to pass through. Hole 152.

The partition plate 15 is an annular plate, and the installation holes 151 through which the heat exchange tubes 14 pass 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.

As shown in FIG. 10 and FIG. 11 , 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 body 1 , and perpendicular to the partition plate 15 at the same time. One end of the shielding plate 171 extends to the inner wall of the barrel 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 of the cylinder body 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 so as to guide the gypsum powder through the through hole 152 .

Both the baffle plate 171 and the guide plate 172 can be provided with a raised edge 173, so that the gypsum powder falling on the baffle plate 171 and the guide plate 172 can fall off and be thrown out.

In an exemplary embodiment, as shown in FIG. 1 , FIG. 3 and FIG. 5 , the calcining equipment further includes a supporting device 2 for supporting the barrel 1 .

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

Multiple supporting devices 2 may be provided to support the cylinder body 1 at multiple positions in the axial direction of the cylinder body 1 . In practical application, the number of supporting devices 2 can be two, which are located upstream and downstream of the barrel 1 , that is, near the positions of the inlet 11 and the outlet 13 . And the height of the supporting device 2 located downstream is lower than that of the supporting device 2 located upstream, so that the cylinder body 1 maintains an inclination angle of 1.15°.

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; Both sides to support cylinder 1.

The support wheel is rotatably fixed on the base, and the support wheel is in contact with the cylinder body 1 . While the supporting wheels provide supporting force, the rotation of the cylinder body 1 will not be hindered. When the cylinder body 1 rotates, the supporting wheels will rotate together with the cylinder body 1 .

In an exemplary embodiment, as shown in FIG. 1 and FIG. 3 , the calcining equipment further includes a power device 3 for driving the cylinder body 1 to rotate.

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

The transmission between the power unit 3 and the barrel 1 can be carried out in various ways such as belt transmission and gear transmission, and the power unit 3 can also use different forms of drive motors according to actual needs, which will not be repeated here.

In practical application, the support device 2 is installed on the installation platform 21, and when the number of the support device 2 is set to two, the number of the installation platform 21 is also correspondingly two. The power device 3 and one of the supporting devices 2 can be arranged on the same installation platform 21 .

In an exemplary embodiment, as shown in FIG. 2 , FIG. 3 and FIG. 5 , the calcination equipment further includes a lifting plate 18 arranged on the inner wall of the cylinder body 1 , and the lifting plate 18 extends along the radial direction of the cylinder body 1 .

Lifting plate 18 is used for raising and breaking up gypsum powder. During the rotation of the cylinder body 1, the gypsum powder will rotate accordingly, which is easy to form a circulation. Installing the lifting plate 18 on the inner wall of the cylinder body 1 will disperse the gypsum powder, prevent the gypsum powder from forming a circulation, and enable the gypsum powder to fully exchange heat with the heat exchange tube 14 to obtain sufficient heating and calcination.

The lifting plates 18 are provided in multiples along the axial and circumferential directions of the cylinder 1, and are evenly arranged to improve the lifting effect and fully disperse the gypsum powder.

In an exemplary embodiment, as shown in FIG. 4 , the cylinder body 1 is provided with an intermediate discharge port 12 , and part of the materials in the cylinder body 1 are discharged through the intermediate discharge port 12 .

In practical application, a plurality of discharge ports 122 may be arranged on the cylinder body 1 circumferential direction, and a return valve is installed at each discharge port 122 . A ring-shaped sealing cover is set on the outer side of the cylinder body 1. The sealing cover is fixed and dynamically sealed with the cylinder body 1, so as to guide the materials discharged from multiple discharge valves to the middle discharge port 12 and discharge them to other production equipment. (For example: in the feeder 4 located upstream of the cylinder 1).

In addition, an intermediate air return port 121 for blowing in preheated air can also be provided on the cylinder body 1 , and the intermediate air return port 121 and the intermediate discharge port 12 are located at the same axial position of the cylinder body 1 . Make full use of heat during the calcination process, and ensure that the middle discharge port 12 is under a slight positive pressure, which is convenient for discharging; the cylinder 1 can also be provided with a tail return air port 131 for blowing preheated air, and a tail return air port 131 It is located at the same axial position of the cylinder body 1 as the tail discharge port 122 (ie, the discharge port 13 ). , make full use of heat during the calcination process, and ensure that the tail discharge port 122 is under a slight positive pressure, which is convenient for discharging.

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

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

The calcination equipment provided by the embodiment of the present application is stable, efficient, and energy-saving. The calcination equipment is provided with an intermediate discharge port 12, and part of the material is returned to the double-screw feeder, and in the double-screw feeder, the returned dry gypsum is first added powder, and then add wet desulfurization gypsum raw materials. The dry gypsum powder added first avoids direct contact between wet desulfurization gypsum raw materials and equipment, while the free water content in the returned dry gypsum powder is very low, and there is almost no chemical corrosion on the equipment; at the same time, due to the high return temperature (about 110 ℃), which heats the wet desulfurization gypsum raw material in the twin-screw feeder, and stirs and mixes it with it to speed up the drying of the desulfurization gypsum raw material; Ensure the uniform mixing of dry and wet materials; the heating pipe and support at the feed end of the calcination equipment are made of duplex stainless steel 2205/2507 with better corrosion resistance (Cl ^- , SO4 ^2- plasma); the above measures greatly reduce the double-screw feeding Corrosion of machines and calcination equipment. At the same time, the moisture outlet 43 is placed on the high-humidity side of the material inlet 11, so that the generated water vapor can be discharged in time to prevent high-humidity gas from penetrating the calcination equipment, which not only reduces the corrosion of the calcination equipment, but also optimizes the calcination quality. The preheating air is blown into the calcining equipment from the middle air return port 121 and the rear air return port 131, which not only makes full use of the heat, but also reduces the humidity of the upper atmosphere of the calcining equipment, reduces the corrosion of the calcining equipment and subsequent dust collection equipment, and at the same time Ensure that the middle discharge port 12 and the tail discharge port 122 are slightly positive pressure, which is beneficial to discharging. The heat exchange tube 14 is a bare tube near the feed end, a spiral fin 144 is arranged in the middle section, and a sleeve 145 is arranged at the discharge end. Since the wet material has a certain viscosity, using a smooth tube at the feed end can effectively prevent the wet material from adhering to the outer wall of the tube. The middle section uses spiral fins 144 to increase the heat transfer area and improve the heat transfer intensity. A sleeve 145 is installed at the discharge end, which can Effectively weaken heat transfer and avoid over-burning of materials. The middle discharge port 12 and the rear discharge port 122 are provided with partition boards, which divide the calcination equipment into multiple calcination areas, realize calcination in different areas, ensure the quality of calcination, 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, and rotates with the cylinder 1 to raise the material close to the inner wall, preventing the material from sliding along the inner wall to form a circulation, which affects the uniformity of calcination. At the same time, the heat exchange tubes 14 are arranged in a regular polygon (non-circular shape). During the rotation of the cylinder body 1, the heat exchange tubes 14 stir and disperse the materials, thereby making the calcination more uniform.

The embodiment of the present application also provides a calcination system. The calcination system includes a feeder 4 and the aforementioned calcination equipment. The outlet of the feeder 4 communicates with the feed inlet 11 .

The calcining system provided in the embodiment of the present application has the aforementioned calcining equipment, and the production is efficient and stable, and the quality of the finished gypsum is high.

In an exemplary embodiment, as shown in Figure 6, the feeder 4 is provided with a wet material inlet 42 and a return inlet 41, and part of the materials in the calcining equipment enter the feeder 4 through the return inlet 41; In the conveying direction, the return inlet 41 is located upstream of the wet material inlet 42 .

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

The return 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, so as to ensure that the feeder 4 will not be corroded by the gypsum raw material (or greatly reduce the impact of the gypsum raw material on the feeder). 4 degree of corrosion). Of course, the feed inlet 41 of the intermediate feed back on the feeder 4 can also be the same inlet as the wet feed inlet 42 of the gypsum raw material on the feeder 4 (that is: the intermediate feed back and the gypsum raw material are at the same feed inlet. 11 into the feeder 4).

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

In an exemplary embodiment, the feeder 4 is a twin-screw feeder.

The double-screw feeder is used to fully mix the raw materials and recycled materials and send them into the rotary kiln. The double-screw feeder has the effects of material transportation and material dispersion.

The blades 45 in the double screw feeder can take the form of discontinuous screw blades 45 . The conveying efficiency of the continuous spiral blade 45 is high, 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. In the double-screw feeder in the embodiment of the present application, the blades 45 are arranged in a plurality of discontinuous types, and the plurality of blades 45 are arranged radially on the rotating shaft 44 of the double-screw feeder, and are arranged obliquely in the axial direction. In order to generate axial thrust on the material during the rotation of the blade 45 . While the blade 45 rotates to push the material forward, it also has a certain effect of breaking up the material, so as to avoid the agglomeration of the gypsum powder during the conveying process.

In the description in this application, it should be noted that the orientation or positional relationship indicated by "upper", "lower", "one end", "one side", etc. is based on the orientation or positional relationship shown in the drawings, and is only To facilitate the description of the present application and to simplify the description, it does not indicate or imply that the referred structure has a specific orientation, is constructed and operates in a specific orientation, and thus should not be construed as limiting the present application.

In the description of the embodiments of this application, unless otherwise 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 or an optional Disassembled connection, or integral connection; it can be directly connected, or indirectly connected through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in this application in specific situations.

The embodiments described in this application are illustrative rather than restrictive, and it will be obvious to those of ordinary skill in the art that more embodiments are possible within the scope of the embodiments described in this application and implementation plans. 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. Except where expressly limited, any feature or element of any embodiment may be used in combination with, or substituted for, any other feature or element of any other embodiment.

This 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 can also be combined with any conventional features or elements to form a unique technical solution defined by the claims. Any feature or element 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. It is therefore to be understood that any of the features shown and/or discussed in this application can be implemented alone or in any suitable combination. Accordingly, the embodiments are not to be limited except in accordance with the appended claims and their equivalents. Furthermore, various modifications and changes may be made within the scope of the appended claims.

Claims (20)

1. A calcining equipment, characterized in that it comprises a cylinder body and a heat exchange tube arranged in the cylinder body, the cylinder body is provided with a material inlet and a material outlet, and the heat exchange tube is used to heat the the material in the cylinder; The heat exchange efficiencies of the tube sections at different positions along the length direction of the barrel of the heat exchange tube are different. 2. The calcining equipment 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, and the heat exchange at the second tube section The efficiency is greater than the heat exchange efficiency at the first pipe section, and the heat exchange efficiency at the third pipe section is smaller than the heat exchange efficiency at the first pipe section. 3 . The calcining equipment according to claim 2 , wherein spiral fins are provided on the outside of the second pipe section, and a casing is provided on the outside of the third pipe section. 4 . 4 . The calcining equipment according to claim 1 , wherein a plurality of heat exchange tubes are arranged in a circumferential direction of the cylinder body, and the plurality of heat exchange tubes are surrounded to form a polygonal structure. 5. The calcining equipment according to claim 4, characterized in that, a plurality of said heat exchange tubes in the circumferential direction are surrounded to form a regular hexagon. 6. 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 body. 7. The calcining equipment according to claim 1, characterized in that, the cylinder extends along the horizontal direction, and is arranged obliquely relative to the horizontal direction, so that the feed end of the cylinder is higher than the discharge end of the cylinder end. 8. The calcining equipment according to claim 7, characterized in that, the inclination angle of the cylinder is 1° to 3°. 9. The calcining equipment according to claim 1, further comprising a partition plate arranged in the cylinder, the partition plate divides the cylinder into a plurality of relatively independent cavities; Via holes for materials to pass are arranged on the partition plate. 10. The calcining equipment according to claim 9, further comprising a discharge plate connected to the partition plate, one end of the discharge plate extends towards the through hole of the partition plate, so as to The material is guided to the through hole and passes through the dividing plate. 11. The calcining equipment according to claim 10, wherein 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 baffle plate and a guide plate, the baffle plate is fixed on the partition plate and extends to the through hole along the radial direction of the partition plate, and the guide plate The axial extension of the partition plate passes through the through hole, so as to guide the material to pass through the through hole. 12. The calcining equipment according to claim 1, further comprising a support device for supporting the barrel. 13. The calcining equipment according to claim 12, wherein 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 are respectively against the two sides of the bottom of the cylinder to support the cylinder. 14. The calcining equipment according to any one of claims 1 to 13, further comprising a power device for driving the cylinder to rotate. 15. The calcining equipment according to any one of claims 1 to 13, further comprising a lifting plate arranged on the inner wall of the cylinder, the lifting plate extending along the radial direction of the cylinder . 16. The calcining equipment according to any one of claims 1 to 13, characterized in that, an intermediate discharge port is provided on the cylinder, and part of the materials in the cylinder are discharged through the intermediate discharge port. 17. The calcining equipment according to any one of claims 1 to 13, characterized in that the calcining equipment is gypsum calcining equipment. 18. A calcination system, characterized by comprising a feeder and the calcination device according to any one of claims 1 to 17, the outlet of the feeder is in communication with the inlet. 19. The calcination system according to claim 18, characterized in that, the feeder is provided with a wet material inlet and a return material inlet, and part of the materials in the calcination equipment enter the feeder through the return material inlet ; In the conveying direction of the material, the return inlet is located upstream of the wet material inlet. 20. The calcining system according to claim 18, characterized in that the feeder is a double-screw feeder.

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