Production device for ultralow-temperature calcined gypsum powder

Abstract

The invention discloses a production device for ultralow-temperature calcined gypsum powder, and relates to the technical field of calcining furnaces. Comprising a horizontally placed rotary kiln, a plurality of steam channels are arranged in the inner wall of the rotary kiln, a dispersing structure is arranged in the rotary kiln, the dispersing structure comprises a plurality of steam pipes penetrating through the rotary kiln, and guide parts are arranged on the steam pipes; the guide part comprises a sleeve rotationally mounted on the steam pipe, an inclined guide plate is mounted on the sleeve, one end of the guide plate is connected with the sleeve, a counterweight rib is arranged at the end, away from the sleeve, of the guide plate, and the counterweight rib is perpendicular to the plane where the guide plate is located; limiting rings are fixedly installed on the steam pipe, and the sleeve is located between the two limiting rings. And a plurality of groups of inclined baffles are mounted on the inner wall of the rotary kiln. The device can remarkably improve the calcining effect and meet the requirement for producing special gypsum through ultralow-temperature calcining.

Description

Technical Field

[0001] The invention relates to the technical field of calcining furnaces, in particular to a production device for ultra-low temperature calcining gypsum powder. Background Art

[0002] Gypsum is a widely distributed mineral whose chemical composition is calcium sulfate dihydrate. Gypsum has low hardness, low solubility in water, and is relatively stable in a humid environment. Gypsum has a wide range of applications, from building materials to sculpture materials, to soil conditioners, and even in the fields of food and medicine. Among them, gypsum board is widely used in modern buildings due to its excellent sound insulation, fire resistance, and simple construction. Gypsum stone or industrial by-product gypsum exists in the form of calcium sulfate dihydrate, and its molecular formula has two crystal waters. Only when one and a half crystal waters are removed to form hemihydrate calcium sulfate can it have gelling properties. The process of removing crystal water is called calcination of gypsum.

[0003] There are many methods for calcining gypsum, such as calcination of natural gypsum, calcination of chemical gypsum, high temperature calcination, low temperature calcination and gas calcination. These methods have different characteristics and application ranges, and the appropriate method should be selected according to production conditions and product requirements. At the same time, controlling factors such as calcination temperature, atmosphere and time is the key to ensuring product quality and performance. Low temperature calcination is to calcine the gypsum raw material at a lower temperature. This method can obtain some special calcined gypsum, such as high-strength gypsum, rapid hardening gypsum, etc. Low temperature calcined gypsum has better processing performance and mechanical properties, and is suitable for the production of some special purposes.

[0004] Steam rotary kiln is a common low-temperature calcination equipment for gypsum. It uses a large kiln drum that can rotate slowly, and multiple steam pipes that can circulate hot steam are set on the kiln drum. After the gypsum raw materials enter from one end of the rotary kiln, they continue to move to the other end as the rotary kiln slowly rotates. In this process, the gypsum is slowly calcined under the action of high-temperature steam. In order to fully calcine the gypsum, generally not too much gypsum is put into the rotary kiln, which means that the gypsum can only contact the space at the bottom of the rotary kiln, the utilization rate of heat is limited, the energy cost of calcination is high, and the calcination efficiency is very low. Summary of the invention

[0005] The purpose of the present invention is to provide a production device for ultra-low temperature calcined gypsum powder to solve the problems raised in the above background technology. A low-temperature calcination device with more complete calcination is proposed, which increases the contact time between the gypsum raw material and the heat source, and effectively avoids the problem of dead corners in the gypsum that cannot contact the heat source, significantly improving the calcination effect of the gypsum.

[0006] To achieve the above object, the present invention provides the following technical solutions: A production device for ultra-low temperature calcined gypsum powder, comprising a horizontally placed rotary kiln, the rotary kiln is a cylindrical structure, a plurality of steam channels are arranged inside the inner wall of the rotary kiln, a dispersion structure is arranged inside the rotary kiln, the dispersion structure comprises a plurality of steam pipes penetrating the rotary kiln, the steam pipes are provided with guide members; the guide member comprises a sleeve rotatably mounted on the steam pipe, an inclined guide plate is mounted on the sleeve, one end of the guide plate is connected to the sleeve, a counterweight rib is arranged at one end of the guide plate away from the sleeve, the counterweight rib and the plane where the guide plate are located are perpendicular to each other; a limiting ring is fixedly mounted on the steam pipe, the sleeve is located between the two limiting rings; a plurality of inclined baffles are mounted on the inner wall of the rotary kiln; A base is arranged outside the rotary kiln, and a driving structure is installed on the base. The driving structure is used to control the rotation of the rotary kiln.

[0007] As a further solution of the present invention: one end of the rotary kiln is connected to the kiln head, and the other end is connected to the kiln tail, the kiln head is provided with a steam input end, the kiln tail is provided with a steam output end, the kiln head is provided with a discharge port connected to the rotary kiln, and the kiln tail is provided with a feed port connected to the rotary kiln.

[0008] As a further solution of the present invention: steam cylinders are respectively arranged in the kiln head and the kiln tail, both ends of the steam pipe are connected to the steam cylinders, and the steam cylinders are respectively connected to the steam input end and the steam output end.

[0009] As a further solution of the present invention: the dispersed structure includes a plurality of support plates arranged inside the rotary kiln, the steam pipes all penetrate the support plates and are fixedly connected to the support plates, and the support plates are connected to the inner wall of the rotary kiln through a plurality of support rods.

[0010] As a further solution of the present invention: a plurality of fixing sleeves are arranged outside the rotary kiln, a plurality of pairs of supporting wheels are arranged on the base, and the fixing sleeves are placed on the supporting wheels.

[0011] As a further solution of the present invention: the driving structure includes a gear ring fixedly mounted on the rotary kiln, a driving gear is rotatably mounted on the base, the driving gear and the gear ring are meshed and connected, a motor is mounted on the base, the motor is connected to a transmission, and the transmission is connected to the driving gear.

[0012] As a further solution of the present invention: a support ring is arranged inside the gear ring, and a plurality of connecting pieces are obliquely connected to the inside of the support ring, and the connecting pieces are connected to the surface of the rotary kiln.

[0013] Compared with the prior art, the present invention has the following beneficial effects: The above-mentioned ultra-low temperature calcined gypsum powder production device is used. The device can process gypsum under low temperature conditions by continuous long-term calcination. The gypsum is driven by the baffle to be lifted above the dispersion structure in the rotary kiln, falls on the steam pipe, passes through the gaps between the steam pipes and falls downward, and hits the surface of the guide member at the same time. Since the surface of the guide member is inclined, the falling trajectory of the gypsum will be inclined forward, thereby promoting the gypsum to move slowly forward without the rotary kiln itself pushing. By adopting the above-mentioned ultra-low temperature calcined gypsum powder production device, the device can continuously disperse the gypsum to avoid the situation where local gypsum is not completely calcined. The device can significantly improve the calcination effect through the built-in steam pipe and promote the continuous feeding and discharging of gypsum. Since the center of gravity of the guide part is lower than that of the steam pipe, the guide part can always maintain its own natural hanging state under the premise that the steam pipe rotates with the rotary kiln, and always has the effect of pushing the gypsum forward. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the structure of a production device for ultra-low temperature calcined gypsum powder.

[0015] Figure 2 This is a schematic diagram of the side section structure of a rotary kiln in a production device for ultra-low temperature calcined gypsum powder.

[0016] Figure 3 This is a schematic structural diagram of the cross section of a rotary kiln in a production device for ultra-low temperature calcined gypsum powder.

[0017] Figure 4 This is a schematic diagram of the structure of the dispersed structure in the production device for ultra-low temperature calcined gypsum powder.

[0018] Figure 5 This is a schematic diagram of the structure of the connection between the steam pipe and the guide member in the production device for ultra-low temperature calcined gypsum powder.

[0019] In the figure: 1-rotary kiln; 11-fixed sleeve; 12-base; 13-support wheel; 14-steam channel; 15-baffle; 2-driving structure; 21-connecting plate; 22-support ring; 23-gear ring; 24-driving gear; 25-transmission; 26-motor; 3-kiln head; 31-steam input end; 32-discharge port; 4-kiln tail; 41-feed port; 42-steam output end; 5-dispersion structure; 51-steam cylinder; 52-guide member; 521-sleeve; 522-guide plate; 523-counterweight rib; 53-support plate; 531-support rod; 54-steam pipe; 541-limiting ring. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] See also Figures 1 to 5 In an embodiment of the present invention, a production device for ultra-low temperature calcined gypsum powder comprises a horizontally placed rotary kiln 1, wherein the rotary kiln 1 is a cylindrical structure, wherein a plurality of steam channels 14 are arranged inside the inner wall of the rotary kiln 1, wherein a dispersion structure 5 is arranged inside the rotary kiln 1, wherein the dispersion structure 5 comprises a plurality of steam pipes 54 penetrating the rotary kiln 1, wherein a guide member 52 is arranged on the steam pipe 54; wherein the guide member 52 comprises a sleeve 521 rotatably mounted on the steam pipe 54, wherein an inclined guide plate 522 is arranged on the sleeve 521, wherein one end of the guide plate 522 is connected to the sleeve 521, wherein a counterweight rib 523 is arranged on the end of the guide plate 522 away from the sleeve 521, wherein the counterweight rib 523 is perpendicular to the plane where the guide plate 522 is located; wherein a limiting ring 541 is fixedly mounted on the steam pipe 54, wherein the sleeve 521 is located between two limiting rings 541; wherein a plurality of inclined baffles 15 are arranged on the inner wall of the rotary kiln 1; A base 12 is disposed outside the rotary kiln 1 , and a driving structure 2 is installed on the base 12 . The driving structure 2 is used to control the rotation of the rotary kiln 1 .

[0022] The device uses a rotary kiln 1 with a steam channel 14 to calcine gypsum powder. Steam maintained at a certain temperature is continuously introduced into the steam channel 14 to heat the rotary kiln 1. While the gypsum powder inside the rotary kiln 1 moves slowly in the rotary kiln 1, the temperature gradually increases, achieving the effect of low-temperature calcination.

[0023] An integrated bundle of steam pipes 54 is placed in the rotary kiln 1, and a large number of guide members 52 are placed on the steam pipes 54. A plurality of inclined baffles 15 are arranged on the inner wall of the rotary kiln 1, so that the gypsum will be blocked by the baffles 15 as the rotary kiln 1 is driven, and will be continuously lifted to the top of the steam pipes 54 before being sprinkled from the baffles 15. The sprinkled gypsum passes through the gaps of the plurality of steam pipes 54, which can increase the contact time between the gypsum and the inner wall of the rotary kiln 1. The gypsum can also be further fully dispersed through the steam pipes 54, and the heat absorption is enhanced to achieve a better effect of reducing the amount of gypsum.

[0024] In this device, since the gypsum needs to be calcined at low temperature for several hours, in order to prevent the gypsum from passing through the rotary kiln 1 quickly, the rotary kiln 1 itself is not in a tilted state, but the direction change caused by the gypsum being thrown on the guide member 52 is used to achieve the effect of slow movement of the gypsum. The sleeve 521 of the guide member 52 is sleeved on the steam pipe 54 and can rotate. The guide plate 522 is tilted and one end is connected to the sleeve 521. At the same time, a counterweight rib 523 with a large weight is also provided behind the guide plate 522 to maintain the stability of the overall structure. Under the action of gravity, although the steam pipe 54 will continuously change its own orientation and angle as the rotary kiln 1 rotates, the guide member 52 on each steam pipe 54 can keep the guide plate 522 always located below the sleeve 521. In this state, the inclination angles of all guide plates 522 are consistent, that is, the moving direction of the gypsum. The gypsum falls on the guide plate 522 from above, moves a short distance along the inclined plane where the guide plate 522 is located, and continues to fall with a forward speed. Through this process, the gypsum can be pushed to move forward slowly. And because only the gypsum falling from a high place has a forward moving speed, the device can ensure that all the gypsum must be fully and thoroughly calcined before it can be discharged.

[0025] In addition to guiding the direction of the gypsum, the guide plate 522 also has the effect of enhancing heat transfer. Since the guide plate 522 and the sleeve 521 are both connected to the steam pipe 54, they can maintain a certain high temperature under the action of the steam pipe 54. The gypsum falls on the guide plate 522, which can also further enhance the thermal contact and improve the calcination effect.

[0026] As another embodiment of the present invention, please refer to Figure 1 One end of the rotary kiln 1 is connected to the kiln head 3, and the other end is connected to the kiln tail 4. The kiln head 3 is provided with a steam input end 31, and the kiln tail 4 is provided with a steam output end 42. The kiln head 3 is provided with a discharge port 32 connected to the rotary kiln 1, and the kiln tail 4 is provided with a feed port 41 connected to the rotary kiln 1. The steam input end 31 of the kiln head 3 supplies steam to the steam channel 14 and the steam pipe 54. After the steam is calcined, it is discharged from the steam output end 42 at the other end. The steam input end 31 can be a steam supply device or a circulation system, etc., to continuously output hot steam. The feed port 41 is used to feed the gypsum raw material into the rotary kiln 1. After sufficient calcination, the gypsum reaching the kiln head 3 is discharged from the rotary kiln 1 and falls into the discharge port 32, which can be collected by manual or automatic equipment.

[0027] See also Figure 1 and Figure 2The kiln head 3 and the kiln tail 4 are respectively provided with steam cylinders 51, both ends of the steam pipe 54 are connected to the steam cylinders 51, and the steam cylinders 51 are respectively connected to the steam input end 31 and the steam output end 42. The steam cylinder 51 is used to supply air to the steam pipe 54 and finally collect the discharged air flow to cross the feed port 41 and the discharge port 32 to realize the conduction of the material.

[0028] See also Figure 3 and Figure 4 The dispersed structure 5 includes a plurality of support plates 53 disposed inside the rotary kiln 1, the steam pipes 54 all penetrate the support plates 53 and are fixedly connected to the support plates 53, and the support plates 53 are connected to the inner wall of the rotary kiln 1 through a plurality of support rods 531. The support plates 53 are used to integrate the dispersed steam pipes 54 into a bundle and form a stable connection with the rotary kiln 1. The transmission of gypsum will be slightly blocked at the support plates 53, but it will not affect the slow transmission of gypsum, only reduce the transmission efficiency, and thus meet the use requirements of the device for several hours of calcination.

[0029] See also Figure 1 and Figure 2 The rotary kiln 1 is provided with a plurality of fixed sleeves 11 on the outside, and a plurality of pairs of supporting wheels 13 are provided on the base 12, and the fixed sleeves 11 are placed on the supporting wheels 13. The fixed sleeves 11 are used to enhance the stability of the rotary kiln 1 itself, and the external supporting wheels 13 provide support for the fixed sleeves 11 and enable the fixed sleeves 11 to rotate smoothly, and the various parts of the rotary kiln 1 are kept coaxially rotating by adjusting the supporting wheels 13.

[0030] See also Figures 1 to 3 The driving structure 2 includes a gear ring 23 fixedly mounted on the rotary kiln 1, a driving gear 24 is rotatably mounted on the base 12, and the driving gear 24 is meshedly connected with the gear ring 23. A motor 26 is mounted on the base 12, and the motor 26 is connected to a transmission 25, and the transmission 25 is connected to the driving gear 24. The motor 26 is connected to the driving gear 24 through the transmission 25, and the driving gear 24 drives the gear ring 23 to rotate slowly. Since the gear ring 23 is fixed outside the rotary kiln 1, it can also drive the rotary kiln 1 to rotate. The gear ring 23 and the driving gear 24 are not necessary structures, but are only used as an illustrative description of an available structure. In addition to using the gear ring 23, the use of a pressure-contact shaft ring and a roller can also provide a stable drive.

[0031] See also Figure 2 and Figure 3A support ring 22 is provided inside the gear ring 23, and a plurality of connecting pieces 21 are obliquely connected inside the support ring 22, and the connecting pieces 21 are connected to the surface of the rotary kiln 1. The support ring 22 supports the stability of the gear ring 23 from the inside, and the connecting pieces 21 inside the support ring 22 have a certain elasticity. By connecting the rotary kiln 1 through the connecting pieces 21, the stability of the connection can be enhanced, and the installation defects caused by the coaxiality error of large equipment can be improved.

[0032] The working principle of the present invention is: The device uses a rotary kiln 1 to calcine gypsum. A plurality of steam channels 14 are opened inside the inner wall of the rotary kiln 1. The temperature inside the rotary kiln 1 is maintained by hot steam to perform low-temperature calcination. A plurality of steam pipes 54 that are aggregated into bundles are also arranged inside the rotary kiln 1. The steam pipes 54 are also used for steam transmission. A large number of sleeves 521 are rotatably mounted on the steam pipes 54. An inclined guide plate 522 is mounted on the sleeve 521. A counterweight rib 523 for maintaining the center of gravity is also arranged on the opposite side of the inclined direction of the guide plate 522. A plurality of inclined baffles 15 distributed along the axial direction are arranged inside the rotary kiln 1. As the rotary kiln 1 slowly rotates, the gypsum will be continuously raised along with the baffles 15 in the gaps between the baffles 15, and will be sprinkled near the highest point. The sprinkled gypsum will pass through the gaps between the steam pipes 54 and come into contact with the steam pipes 54. In this process, the gypsum can be fully dispersed and the heating effect of the gypsum can be significantly improved. The gypsum hits the guide plate 522, generating a forward speed, and slowly moves forward in the rotary kiln 1, continuously outputting the fully calcined gypsum. The device can produce gypsum that meets special functions through low-temperature calcination, and the device has significant improvements in the function of long-term low-temperature calcination compared to traditional calcination equipment.

[0033] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A production device for ultra-low temperature calcined gypsum powder, comprising a horizontally placed rotary kiln, characterized in that: The rotary kiln is a cylindrical structure, and a plurality of steam channels are arranged inside the inner wall of the rotary kiln. A dispersion structure is arranged inside the rotary kiln, and the dispersion structure includes a plurality of steam pipes penetrating the rotary kiln, and a guide member is arranged on the steam pipe; the guide member includes a sleeve rotatably mounted on the steam pipe, and an inclined guide plate is arranged on the sleeve, one end of the guide plate is connected to the sleeve, and a counterweight rib is arranged on the end of the guide plate away from the sleeve, and the counterweight rib and the plane where the guide plate are located are perpendicular to each other; a limit ring is fixedly mounted on the steam pipe, and the sleeve is located between the two limit rings; a plurality of inclined baffles are arranged on the inner wall of the rotary kiln; A base is arranged outside the rotary kiln, and a driving structure is installed on the base. The driving structure is used to control the rotation of the rotary kiln.

2. The production device for ultra-low temperature calcined gypsum powder according to claim 1, characterized in that: One end of the rotary kiln is connected to the kiln head, and the other end is connected to the kiln tail. The kiln head is provided with a steam input end, the kiln tail is provided with a steam output end, the kiln head is provided with a discharge port connected to the rotary kiln, and the kiln tail is provided with a feed port connected to the rotary kiln.

3. The production device for ultra-low temperature calcined gypsum powder according to claim 2, characterized in that: Steam cylinders are respectively arranged in the kiln head and the kiln tail, both ends of the steam pipe are connected to the steam cylinders, and the steam cylinders are respectively connected to the steam input end and the steam output end.

4. The production device for ultra-low temperature calcined gypsum powder according to claim 1, characterized in that: The dispersion structure comprises a plurality of support plates arranged inside the rotary kiln, the steam pipes all penetrate the support plates and are fixedly connected to the support plates, and the support plates are connected to the inner wall of the rotary kiln through a plurality of support rods.

5. The production device for ultra-low temperature calcined gypsum powder according to claim 1, characterized in that: A plurality of fixing sleeves are arranged outside the rotary kiln, a plurality of pairs of supporting wheels are arranged on the base, and the fixing sleeves are placed on the supporting wheels.

6. The production device for ultra-low temperature calcined gypsum powder according to claim 1, characterized in that: The driving structure comprises a gear ring fixedly mounted on the rotary kiln, a driving gear rotatably mounted on the base, the driving gear and the gear ring are meshed and connected, a motor is mounted on the base, the motor is connected to a transmission, and the transmission is connected to the driving gear.

7. The production device for ultra-low temperature calcined gypsum powder according to claim 6, characterized in that: A support ring is arranged inside the gear ring, and a plurality of connecting pieces are obliquely connected to the inside of the support ring, and the connecting pieces are connected to the surface of the rotary kiln.

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