Drying and calcining equipment for improving quality of high-strength gypsum powder

Abstract

The utility model relates to the technical field of high-strength gypsum powder calcination, in particular to drying and calcining equipment for improving the quality of high-strength gypsum powder, which comprises a vertical shell, a dust collecting cover is mounted above the vertical shell, a variable frequency motor and a speed reducer are arranged at the top end of the dust collecting cover, and an output shaft of the speed reducer is connected with a stirring rotating shaft; the vertical shell is divided into an upper-layer heat exchange area and a lower-layer heat exchange area, and an air distribution box is arranged below the vertical shell; a stirring needle rod assembly is arranged between the upper heat exchange area and the dust collection cover; a mixing stirring fin assembly is arranged between the upper heat exchange area and the lower heat exchange area; a mixing stirring fin assembly is arranged between the lower heat exchange area and the air distribution box; and the centers of the stirring needle rod assembly and the two groups of mixing shifting wing assemblies are respectively connected with the stirring rotating shaft. Aiming at the current situation that a high-strength gypsum powder product produced by an existing process is unstable in three phases and serious in product quality fluctuation, the quality of the gypsum powder is improved by finely regulating and controlling the technological process and optimizing the three-phase ratio of the product, so that the gypsum powder can meet the use requirements of downstream industries on deep processing of gypsum products.

Description

TECHNICAL FIELD

[0001] The utility model relates to high -strength gypsum powder calcination technical field, concretely is a kind of drying calcining equipment for improving high -strength gypsum powder quality. BACKGROUND

[0002] Traditional semi-dry method gypsum production process is made into simple geometric shape, such as block or spherical, into steam pressure device and obtains the semi-hydrated high-strength gypsum needed after steaming and burning, the defect of this process is that the internal moisture of desulfurization gypsum raw material is not controlled, and the drying of moisture is not thorough, due to the existence of crystallization water and attached water in raw material, leading to the quality of gypsum product after autoclave is extremely imperfect, due to the existence of attached water, leading to part of gypsum powder to appear to be lumped, a part of dihydrate gypsum is hydrated again after dehydration, and the crystallization water content cannot be accurately adjusted, leading to product three-phase instability, and then leading to serious product quality fluctuation.

[0003] For example, the patent with publication number CN202323244655.7 for gypsum powder fluidized calcination preheating device was published on July 9, 2024, which relates to a preheating device for gypsum powder fluidized calcination, which breaks the material through a crushing device to reduce the lumping phenomenon, heats the material through a heating device, reduces the amount of water vapor in the bin through a condensing device to improve drying efficiency, and facilitates the distribution and discharge process of the material through a vibrating device, reducing the labor intensity of the operator and improving the practicability of the device; the device comprises a crushing device, a heating device, a condensing device and a vibrating device, the heating device is installed on the crushing device, the condensing device is installed on the crushing device, and the vibrating device is installed on the crushing device. The desulfurization gypsum powder produced by this process will have a large amount of water for gypsum hydration, resulting in a large standard thickening and general strength, which is far from the strength standard of high-strength gypsum, and due to the instability of the three phases, the amount of other additives is difficult to control, which seriously affects the construction progress and brings difficulties and additional expenses to the construction enterprises in purchasing additives, increasing production costs.

[0004] At the same time, due to the existence of lumping, it will limit the application of gypsum products in some fields, such as plastering on the wall, ground self-leveling and other applications with strict requirements on flatness. INVENTION CONTENTS

[0005] To solve the technical problems in the background art, the utility model provides a drying calcining equipment for improving high-strength gypsum powder quality.

[0006] The technical solution of this utility model is as follows: A drying and calcining equipment for improving the quality of high-strength gypsum powder includes a vertical shell, a dust collection hood installed on the top of the vertical shell, a feed inlet and a dust collection pipe provided on the dust collection hood, a variable frequency motor and a reducer provided at the top of the dust collection hood, and a stirring shaft connected to the output shaft of the reducer.

[0007] The vertical shell is divided into an upper heat exchange zone and a lower heat exchange zone, and an air distribution box is installed at the bottom of the vertical shell.

[0008] A stirring needle rod assembly is installed between the upper heat exchange zone and the dust collection hood.

[0009] A mixing fin assembly is installed between the upper heat exchange zone and the lower heat exchange zone.

[0010] A mixing deflector assembly is installed between the lower heat exchange zone and the air distribution box.

[0011] The centers of the stirring needle assembly and the two sets of mixing fin assemblies are respectively connected to the stirring shaft.

[0012] The stirring needle rod assembly includes a central retainer and several horizontally arranged main needle rods evenly distributed around its outer periphery. The central retainer is fitted onto the stirring shaft. Several branch needle rods are provided on the main needle rods. The axis of the branch needle rods is perpendicular to the axis of the main needle rods. A plow blade is vertically provided at the end of each branch needle rod.

[0013] The plow blade is V-shaped, and the inside of the opening is fixedly connected to the needle bar.

[0014] The mixing deflector assembly includes a middle sleeve and multiple deflector blades evenly distributed around its outer periphery. The angle between the deflector blades and the horizontal plane is acute, and their trailing edges have a serrated structure.

[0015] The vertical shell is also equipped with a metal insulation shell, which is connected to the vertical shell through several sets of support mechanisms.

[0016] Insulation material is also filled between the vertical shell and the metal insulation shell. The vertical shell is square or cylindrical.

[0017] Furthermore, an inspection port is provided in the middle of the metal insulation shell for routine fault detection and repair of the equipment.

[0018] The upper heat exchange zone and the lower heat exchange zone are each surrounded by heat exchange tube arrays. Each heat exchange tube array consists of several layers of vertical heat exchange tubes. An inlet pipe is also provided on the outside of the vertical shell and connected to the heat exchange tube array to receive steam. An outlet pipe is also provided on the outside of the vertical shell and connected to the heat exchange tube array to discharge condensate.

[0019] Furthermore, the vertical shell below the lower heat exchange zone of this equipment is also provided with a discharge port, which extends outward and upward from the vertical shell.

[0020] Preferably, the bottom of the discharge port is further provided with an emergency discharge port and an emergency discharge valve for coping with emergency situations.

[0021] The air distribution box is in the shape of a square or a circle, and the area of the upper surface is greater than that of the lower surface.

[0022] The air distribution box is provided with an air distribution plate full of small holes.

[0023] The utility model has the advantages of:

[0024] 1. The utility model can control the water content in the gypsum powder by adjusting the feed quantity and the steam pressure, so as to meet the required process standard.

[0025] 2. The stirring needle rod assembly and the mixing fin assembly inside the utility model can break the agglomerates in the gypsum powder, improve the fineness of the gypsum powder to a certain extent, and make the gypsum powder meet the requirements of downstream plastering, wall painting and self-leveling construction.

[0026] 3. The gypsum powder produced by the existing process is unstable in three phases. By calcining dihydrate gypsum in the gypsum powder, the dihydrate gypsum is dehydrated into hemihydrate gypsum, the three-phase structure of the gypsum powder is improved, the standard consistency of the gypsum powder is reduced, and the strength is improved by 20%-40%.

[0027] 4. The stirring needle rod assembly of the utility model has a V-shaped plow at the tip of the needle rod, which is made of stainless steel and can withstand the moisture-containing raw materials entering the feed inlet. At the same time, it can break the agglomerated gypsum powder entering the equipment, and can distribute the gypsum powder entering the feed inlet, so that the gypsum powder is evenly distributed in the equipment to achieve high efficiency heat exchange.

[0028] 5. The newly designed mixing fin assembly has a certain angle between the cross section of the fin page in the stirring assembly and the horizontal plane. The angle can better mix the upper and lower layers of materials, promote the convection of the material layers, and the rear edge of the fin blade has a sawtooth structure. This structure can cooperate with the fluidization air at the bottom of the equipment to make the materials better fluidized and float, and improve the heat exchange efficiency.

[0029] 6. The size of the fluidization air, the speed of the stirring shaft, and the steam inlet pressure can be adjusted to achieve the required process target according to the production and test index requirements. The adjustment means is diverse.

[0030] 7. In addition to being used to improve the quality of high-strength gypsum powder, the equipment can also be used as an auxiliary process equipment for building gypsum calcination production, and the process use is diversified. BRIEF DESCRIPTION OF DRAWINGS

[0031] In the drawings:

[0032] Figure 1 It is a kind of drying calcining equipment for improving the quality of high-strength gypsum powder sectional view;

[0033] Figure 2 It is a kind of drying calcining equipment for improving the quality of high-strength gypsum powder overall structure schematic diagram;

[0034] Figure 3 It is the structure schematic diagram of stirring needle bar assembly;

[0035] Figure 4 It is the local enlarged schematic diagram of stirring needle bar assembly;

[0036] Figure 5 It is the structure schematic diagram of mixing wing pushing assembly;

[0037] Figure 6 It is the local enlarged schematic diagram of wing blade;

[0038] Figure 7 It is the schematic diagram of vertical shell and metal heat preservation shell connection mode.

[0039] The components represented by the reference signs in the drawings are:

[0040] 1, vertical shell;2, dust collecting hood;3, feed inlet;4, dust collecting pipe;5, variable frequency motor;6, speed reducer;7, stirring shaft;8, heat exchange pipe group;9, upper heat exchange zone;10, lower heat exchange zone;11, stirring needle bar assembly;12, mixing wing pushing assembly;13, air distribution box;14, air distribution plate. DETAILED DESCRIPTION

[0041] In order to facilitate the understanding of the present application, the present application will be described more comprehensively with reference to the related drawings.

[0042] Example 1

[0043] Referring to Figures 1 to 7 A kind of drying calcining equipment for improving the quality of high-strength gypsum powder, including vertical shell 1, vertical shell 1 top is equipped with dust collecting hood 2, dust collecting hood 2 is provided with feed inlet 3 and dust collecting pipe 4, dust collecting hood 2 top is provided with variable frequency motor 5 and speed reducer 6, as Figure 1 And Figure 2 As shown in the drawings, the output shaft of speed reducer 6 is connected with stirring shaft 7.

[0044] Referring to Figure 1The feed inlet 3 receives the gypsum from the conveying device, the dust collection pipe 4 is connected with the dust collector, the water vapor generated after the gypsum is dehydrated and the dust-containing gas generated during the operation of the drying and calcining device is sent into the dust collector under the negative pressure of the dust collector, and the dust is removed.

[0045] The vertical shell 1 is divided into an upper heat exchange zone 9 and a lower heat exchange zone 10, and the vertical shell 1 is provided below with a wind distribution box 13.

[0046] The upper heat exchange zone 9 is provided between the dust collection cover 2 and the vertical shell 1 with a stirring needle rod assembly 11.

[0047] The upper heat exchange zone 9 is provided between the upper heat exchange zone 9 and the lower heat exchange zone 10 with a mixing and wing pushing assembly 12.

[0048] The lower heat exchange zone 10 is provided between the lower heat exchange zone 10 and the wind distribution box 13 with a mixing and wing pushing assembly 12.

[0049] In combination Figure 3 , the centers of the stirring needle rod assembly 11 and the two groups of mixing and wing pushing assemblies 12 are connected with the stirring shaft 7. The required process target can be achieved by adjusting the size of the fluidization wind, the rotating speed of the stirring shaft 7 and the steam inlet pressure according to the requirements of the output and the test index, and the adjustment means is various.

[0050] The stirring needle rod assembly 11 comprises a middle sleeve and a plurality of horizontally arranged main needle rods uniformly distributed on the outer periphery of the middle sleeve, the middle sleeve is sleeved on the stirring shaft 7, a plurality of branch needle rods are arranged on the main needle rod, the axis of the branch needle rod is perpendicular to the axis of the main needle rod, and a plough is vertically arranged at the end of each branch needle rod.

[0051] The plough is V-shaped, and the opening inner side is fixedly connected with the needle rod. Figure 4 The plough is made of stainless steel material, can resist the wet raw materials entering the feed inlet 3, can crush the caked gypsum powder entering the device, can distribute the gypsum powder entering the feed inlet 3, and can uniformly distribute the gypsum powder in the device to realize high-efficiency heat exchange.

[0052] The mixing and wing pushing assembly 12 comprises a middle sleeve and a plurality of wing pushing blades uniformly distributed on the outer periphery of the middle sleeve, and Figure 5 understanding the structure of the mixing and wing pushing assembly 12, the included angle between the wing pushing blade and the horizontal plane is an acute angle, the included angle can better mix the upper and lower material layers, promote the up-and-down convection of the material layers, and the trailing edge is a zigzag structure, as shown in Figure 6 , the structure can cooperate with the fluidization wind at the bottom of the device to better fluidize and float the material, and improve the heat exchange efficiency.

[0053] The stirring needle rod assembly 11 and the mixing fin assembly 12 can realize the crushing effect of the agglomerates in the gypsum powder, and improve the fineness of the gypsum powder to a certain extent, so that it can meet the downstream plastering and self-leveling construction requirements.

[0054] The vertical shell 1 is further provided with a metal heat preservation shell connected with the vertical shell 1 through a plurality of groups of supporting mechanisms to fix the vertical shell 1.

[0055] Referring to Figure 7 The vertical shell 1 and the metal heat preservation shell are further filled with heat preservation materials to achieve the heat preservation effect. The vertical shell 1 is square or cylindrical.

[0056] Further, the metal heat preservation shell is further provided with an inspection opening in the middle for daily fault detection and repair of the equipment.

[0057] The upper heat exchange zone 9 and the lower heat exchange zone 10 are surrounded by the heat exchange pipe group 8, which is composed of a plurality of layers of vertical heat exchange pipes 8. The outer part of the vertical shell 1 is further provided with a steam inlet pipe connected with the heat exchange pipe group 8 to receive steam, and an outlet pipe connected with the heat exchange pipe group 8 to discharge condensed water.

[0058] Further, the lower part of the vertical shell 1 below the lower heat exchange zone 10 is further provided with a discharge port extending outward and upward from the vertical shell 1.

[0059] Preferably, the bottom of the discharge port is further provided with a compressed air inlet, an emergency discharge port and an emergency discharge valve for emergency situations.

[0060] In use, the gypsum powder material enters the inside of the equipment through the inlet 3, and is fully mixed by the rotation of the stirring needle rod assembly 11 and the mixing fin assembly 12 on the stirring shaft 7 while being heated in the upper heat exchange zone 9 and the lower heat exchange zone 10. The gypsum powder material is dehydrated and crushed to a certain extent. With the continuous entry of gypsum powder material into the inlet 3, the gypsum powder material after drying and dehydration begins to show water-like fluidity. According to the principle of fluid communication valve, the position of the gypsum powder material is constantly raised, and when the material level reaches the height of the discharge port, the gypsum powder material is discharged from the discharge port.

[0061] The air distribution box 13 is square or circular in cross section, and the upper surface area is greater than the lower surface area. Further, the air distribution box 13 is a circular truncated cone structure, and the upper surface diameter is greater than the lower surface diameter.

[0062] The cloth air box 13 is provided with a cloth air plate 14 full of small holes. The cloth air box 13 is connected to the Roots blower. The high-pressure air sent by the Roots blower enters the cloth air box 13, then passes through the cloth air plate 14 inside the cloth air box 13 full of small holes, enters the vertical shell 1, and forms fluidization air, which combines with the desulfurized gypsum to form a fluidized state.

[0063] It should be noted that the gypsum powder material sent by the external conveying equipment enters the inside of the drying and calcining equipment through the feed inlet 3. After entering the drying and calcining equipment, it first contacts the stirring needle bar assembly 11. The plow of the stirring needle bar assembly 11 preliminarily crushes the lumps in the gypsum powder material. The gypsum powder material passes through the upper heat exchange zone 9 and then passes through the mixing and stirring fin assembly 12 to complete the further auxiliary crushing process. Through the rotating action of the mixing and stirring fin, it is uniformly spread to the lower heat exchange zone 10, and then enters the bottom of the drying and calcining equipment. Under the continuous rotation of the stirring needle bar assembly 11 and the mixing and stirring fin assembly 12 on the stirring shaft 7, the gypsum powder material is fully mixed, heat exchange is completed, and dehydration is achieved while playing a certain crushing role. The high-pressure fluidization air sent by the Roots blower enters the vertical shell 1 through the cloth air plate 14 full of small holes in the cloth air box 13. Under the combined action of the high-temperature fluidization air and the water vapor after dehydration of the gypsum powder material, the gypsum powder material presents a floating state. As the feed inlet 3 continuously has gypsum powder material entering, the gypsum powder material after drying and dehydration begins to present water-like fluidity, and the material level continuously rises in the inside of the drying and calcining equipment. When the material level reaches the height of the discharge outlet, according to the principle of fluid communication valve, the material is discharged from the discharge outlet.

[0064] The compressed air entering the compressed air inlet can assist the gypsum powder material to float, and at the same time improve the flowability of the high-strength gypsum powder material at the discharge outlet, so that the gypsum powder material is better discharged from the discharge outlet. Since the equipment is designed as overflow, when the drying and calcining equipment needs to be stopped or overhauled, the gypsum powder material remaining in the vertical shell 1 can be discharged from the drying and calcining equipment through the emergency discharge port controlled by the emergency discharge valve.

[0065] The dust-containing gas generated during the operation of the equipment and the water vapor formed during the dehydration of the gypsum powder material are discharged through the dust collection port. The heat exchange steam enters the heat exchange exhaust pipe group 8 through the steam inlet pipe. After the steam does work, the condensed water is discharged through the water outlet pipe. The steam does not directly contact the gypsum powder material, and the heat exchange is completed through indirect heat exchange.

[0066] In view of the three-phase instability of the gypsum powder produced by the existing process, the dihydrate gypsum in the gypsum powder is calcined to become hemihydrate gypsum, which improves the three-phase structure of the gypsum powder, reduces the standard consistency of the gypsum powder, and improves the strength by 20%-40%.

[0067] In addition to being used to improve the quality of high-strength gypsum powder, the equipment can also be used as a calcining auxiliary process equipment for building gypsum production, and the process use is diversified.

Claims

1. A drying and calcining device for improving the quality of high-strength gypsum powder, characterized in that, Including vertical shell (1), vertical shell (1) is installed with dust collecting hood (2) on top, dust collecting hood (2) is provided with feed inlet (3) and dust collecting pipe (4), dust collecting hood (2) top is provided with variable frequency motor (5) and speed reducer (6), the output shaft of speed reducer (6) is connected with stirring rotating shaft (7); Vertical shell (1) is divided into upper heat exchange zone (9) and lower heat exchange zone (10), vertical shell (1) is provided with air distribution box (13) below; Stirring needle bar assembly (11) is arranged between upper heat exchange zone (9) and dust collecting hood (2); Mixing wing pushing assembly (12) is arranged between upper heat exchange zone (9) and lower heat exchange zone (10); Mixing wing pushing assembly (12) is arranged between lower heat exchange zone (10) and air distribution box (13); The center of stirring needle bar assembly (11) and two groups of mixing wing pushing assembly (12) is connected with stirring rotating shaft (7) respectively.

2. The drying and calcining apparatus for improving the quality of high-strength gypsum powder according to claim 1, characterized in that, Stirring needle bar assembly (11) includes intermediate sleeve and several horizontally arranged main body needle bars uniformly distributed on the outer periphery of intermediate sleeve, intermediate sleeve is sleeved on stirring rotating shaft (7), several branch needle bars are arranged on main body needle bar, the axis of branch needle bar is perpendicular to the axis of main body needle bar, plough is vertically arranged at the end of each branch needle bar.

3. The drying and calcining apparatus for improving the quality of high-strength gypsum powder according to claim 2, characterized in that, The plough is V-shaped, and the inside of the opening is fixedly connected with the needle bar.

4. The drying and calcining apparatus for improving the quality of high-strength gypsum powder according to claim 1, characterized in that, The vertical shell (1) is further provided with a metal heat preservation shell, and the metal heat preservation shell is connected with the vertical shell (1) through a plurality of support mechanisms.

5. The drying and calcining apparatus for improving the quality of high-strength gypsum powder according to claim 4, characterized in that, The vertical shell (1) and the metal heat preservation shell are further filled with a heat preservation material.

6. The drying and calcining apparatus for improving the quality of high-strength gypsum powder according to claim 4, characterized in that, The vertical shell (1) is square or cylindrical.

7. The drying and calcining apparatus for improving the quality of high-strength gypsum powder according to claim 1, characterized in that, The upper heat exchange zone (9) and the lower heat exchange zone (10) are surrounded by heat exchange pipe groups (8), the heat exchange pipe groups (8) are composed of a plurality of layers of vertical heat exchange pipes, the vertical shell (1) is further provided with an inlet pipe and a heat exchange pipe group (8) in communication, which receives steam, and the vertical shell (1) is further provided with an outlet pipe and a heat exchange pipe group (8) in communication, which discharges condensed water.

8. The drying and calcining apparatus for improving the quality of high-strength gypsum powder according to claim 1, characterized in that, The air distribution box (13) is square or circular in cross section, and the upper surface area is greater than the lower surface area.

9. The drying and calcining apparatus for improving the quality of high-strength gypsum powder according to claim 8, characterized in that, The air distribution box (13) is provided with an air distribution plate (14) full of small holes.

10. The drying and calcining apparatus for improving the quality of high-strength gypsum powder according to claim 1, characterized in that, Mixing wing pushing assembly (12) includes intermediate sleeve and multiple wing pushing blades uniformly distributed on the outer periphery of intermediate sleeve, the wing pushing blades have an acute angle with the horizontal plane, and the trailing edge thereof is a sawtooth structure.

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