A food-grade anhydrous magnesium sulfate spray drying tower feeding structure

Abstract

The utility model belongs to the technical field of spray drying tower, specifically discloses a food -grade anhydrous magnesium sulfate spray drying tower's feeding structure, including spray drying tower body, cavity and peristaltic pump, the bottom of cavity is equipped with support column, support column and spray drying tower body's top detachable connection, the both sides of cavity are connected with liquid inlet pipe and liquid outlet pipe respectively, one end of liquid inlet pipe and peristaltic pump's liquid discharge end intercommunication, liquid outlet pipe and spray drying tower body atomizer's import end intercommunication, all be equipped with valve on liquid inlet pipe and liquid outlet pipe, one end of liquid inlet pipe intercommunication cavity is located in one end of liquid outlet pipe intercommunication cavity just above, detachable connection has a plurality of rubber rings between liquid inlet pipe and liquid outlet pipe, and the rubber ring is zigzag. Aim at the problem that peristaltic pump generates pulse, leads to the unstable problem of atomization. The utility model passes through setting up cavity as buffer container, and the pulse-containing liquid discharged by peristaltic pump first enters the cavity, and the zigzag rubber ring is matched and is used for buffering the liquid.

Description

Technical Field

[0001] This utility model relates to the field of spray drying tower technology, specifically to a feeding structure for a food-grade anhydrous magnesium sulfate spray drying tower. Background Technology

[0002] The existing production process for anhydrous magnesium sulfate is as follows: First, magnesium oxide powder is added to a reactor and reacted with concentrated sulfuric acid to generate a saturated magnesium sulfate solution. Then, the saturated magnesium sulfate solution is filtered through a filter press to remove impurities, yielding a saturated solution. Next, the saturated solution enters an intermediate tank, and then a screw pump sends the solution to a high-speed centrifugal atomizer at the top of the drying tower. The atomizing disc of the atomizer rotates at high speed to uniformly atomize the liquid into droplets. High-temperature hot air supplied by a natural gas combustion unit enters the drying chamber of the spray drying tower from the top. This hot air enters the spray drying equipment at a suitable and uniform wind speed and comes into contact with the magnesium sulfate solution to begin mass and heat exchange. The liquid then passes through the high-speed centrifugal atomizer at the top of the tower. The rotating spray atomizes the liquid into extremely fine droplets. Upon contact with hot air, the water rapidly absorbs the heat transferred from the hot air and vaporizes, causing the solute magnesium sulfate to separate from the water. The finished magnesium sulfate is continuously discharged and collected from the bottom of the drying tower and the cyclone separator. The water vapor is rapidly discharged, and the product is dried to obtain MgSO4·2H2O. Then, the MgSO4·2H2O is conveyed into the polymerization drying tower through a screw conveyor and undergoes sufficient heat exchange with the high-temperature hot air provided by the natural gas hot air furnace to complete the drying process of anhydrous magnesium sulfate. The dried product enters the cooler to be cooled to below 40°C. The cooled product is then directly packaged into the packaging system to obtain the final product, anhydrous magnesium sulfate.

[0003] However, in the above process, the liquid conveying link from the intermediate tank to the spray drying tower uses a screw pump as the conveying equipment. Although it can achieve stable conveying, problems frequently occur in actual operation. The saturated magnesium sulfate solution is prone to precipitating small crystals, which are easily stuck in the screw meshing gap, causing the pump body pressure to rise sharply. In addition, the residual liquid in the screw cavity is difficult to clean thoroughly.

[0004] To address the shortcomings of screw pumps, workers replaced them with peristaltic pumps. While peristaltic pumps deliver liquid by squeezing a flexible tube, which can be quickly disassembled and replaced, effectively avoiding crystal residue, the alternating squeezing principle of the peristaltic pump introduces pulses. These liquid pulses cause fluctuations in the flow rate of liquid entering the atomizer, leading to unstable atomization. Utility Model Content

[0005] The purpose of this invention is to provide a feeding structure for a food-grade anhydrous magnesium sulfate spray drying tower, in order to solve the problem that the pulse generated by the alternating extrusion of the peristaltic pump causes the liquid flow rate entering the atomizer to fluctuate, resulting in unstable atomization.

[0006] To achieve the above objectives, the basic solution provided by this utility model is as follows: a feeding structure for a food-grade anhydrous magnesium sulfate spray drying tower, comprising a spray drying tower body, a cavity, and a peristaltic pump. A support column is provided at the bottom of the cavity, and the support column is detachably connected to the top of the spray drying tower body. An inlet pipe and an outlet pipe are respectively connected to both sides of the cavity. One end of the inlet pipe is connected to the discharge end of the peristaltic pump, and the outlet pipe is connected to the inlet end of the atomizer in the spray drying tower body. Valves are provided on both the inlet and outlet pipes. One end of the inlet pipe connecting to the cavity is located directly above the end of the outlet pipe connecting to the cavity. Several rubber rings, which are serrated, are detachably connected between the inlet and outlet pipes.

[0007] The working principle of this utility model is as follows: a feeding structure for a food-grade anhydrous magnesium sulfate spray drying tower. When the solution needs to be dried, the peristaltic pump is started first. The peristaltic pump draws saturated magnesium sulfate solution from the intermediate tank through the squeezing hose. The solution enters the inlet pipe through the discharge end of the peristaltic pump. The liquid enters the cavity from the end of the inlet pipe. The liquid flows through the serrated rubber rings with decreasing inner diameter from top to bottom. The liquid flows steadily downward. The stable liquid is delivered to the inlet end of the atomizer of the spray drying tower body through the outlet pipe, providing a stable flow of liquid to the atomizer.

[0008] The beneficial effects of this utility model are as follows: by setting the cavity as a buffer container, the liquid containing pulses discharged by the peristaltic pump first enters the cavity, avoiding direct delivery to the atomizer; at the same time, the inlet pipe is located directly above the outlet pipe, and the liquid can form a stable liquid level difference in the cavity. Combined with the serrated rubber ring, it plays a buffering role on the liquid, which can effectively weaken the pulse.

[0009] Option 2, a preferred embodiment of the basic option, features an opening at the top of the cavity, with a flange connecting a cover to the opening. The bottom of the cover has an annular plate, and the cavity has a positioning groove for embedding the annular plate. A sealing ring is provided at the flange connection between the cover and the cavity. The opening at the top of the cavity, combined with the flange-connected cover, allows for quick opening of the cavity, facilitating thorough cleaning or replacement of the inner wall, rubber rings, and other components. Simultaneously, the annular plate at the bottom of the cover embeds into the positioning groove of the cavity, ensuring precise alignment between the cover and the cavity.

[0010] Option 3, a preferred embodiment of Option 2, features a support rod at the bottom of the cover, with a baffle at one end of the support rod. The baffle faces the end of the inlet pipe that connects to the cavity. A distribution plate is located at the bottom of the baffle, directly above the rubber rings. The outer diameter of the distribution plate is larger than the inner diameter of each rubber ring, and smaller than the inner diameter of the cavity. The baffle at the bottom of the cover faces the outlet of the inlet pipe. When the peristaltic pump discharges liquid from the inlet pipe, it first impacts the baffle, significantly reducing the impact force. Furthermore, the outer diameter of the distribution plate is adapted to the size of the cavity and the rubber rings. After being buffered by the baffle, the liquid first falls onto the distribution plate and then is evenly distributed to the lower rubber rings, preventing the liquid from concentrating on a single area and further optimizing the distribution of the liquid within the cavity, thus enhancing the pulse reduction effect.

[0011] Option 4, a preferred option of the basic option, involves the inner diameter of several rubber rings decreasing sequentially from top to bottom. The serrated rubber rings with decreasing inner diameters from top to bottom can weaken the pulse energy in the liquid in stages after the liquid enters from the inlet pipe. At the same time, the decreasing inner diameter can guide the liquid downwards.

[0012] Option 5, which is a preferred option of the basic option, is provided with a drain pipe at the bottom of the cavity, and a drain valve is provided on the drain pipe; when the equipment is stopped, cleaned or the liquid is replaced, the drain pipe at the bottom of the cavity can be used to completely drain the residual liquid in the cavity by opening the drain valve.

[0013] Option 6, a preferred embodiment of the basic option, involves placing an annular frame inside the cavity. Each rubber ring has a limiting groove on one side, and the inner side of the annular frame has a limiting ring for correspondingly embedding into each limiting groove. The annular frame embeds into the limiting groove of the rubber ring through the limiting ring, allowing each rubber ring to be positioned independently. Simultaneously, when replacing the rubber ring, the annular frame can be directly removed, and all rubber rings can be removed simultaneously without peeling them off one by one from the inner wall of the cavity, reducing disassembly and assembly time. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the feeding structure of a food-grade anhydrous magnesium sulfate spray drying tower according to this utility model. Figure 2 This is a partial sectional view of the feeding structure of a food-grade anhydrous magnesium sulfate spray drying tower according to this utility model; Figure 3 for Figure 2 Another angle of the exploded view; Figure 4 for Figure 3 Enlarged view of point A in the middle. Detailed Implementation

[0015] The present invention will be further described in detail below through specific embodiments: The reference numerals in the accompanying drawings of the instruction manual include: 1. Spray drying tower body; 2. Cavity; 3. Peristaltic pump; 4. Inlet pipe; 5. Outlet pipe; 6. Rubber ring; 7. Valve; 8. Cover; 9. Annular plate; 10. Support rod; 11. Baffle; 12. Distribution plate; 13. Drain pipe; 14. Drain valve; 15. Positioning groove; 16. Annular frame; 17. Limiting groove; 18. Limiting ring; 19. Support column.

[0016] like Figures 1 to 4 The diagram shows the feeding structure of a food-grade anhydrous magnesium sulfate spray drying tower, comprising a spray drying tower body 1, a cavity 2, and a peristaltic pump 3. A support column 19 is fixedly connected to the bottom of the cavity 2, and the support column 19 is bolted to the top of the spray drying tower body 1. An vent pipe 13 is connected to the bottom of the cavity 2, and an vent valve 14 is installed on the vent pipe 13. An inlet pipe 4 and an outlet pipe 5 are connected to both sides of the cavity 2, respectively. One end of the inlet pipe 4 is connected to the discharge end of the peristaltic pump 3, and the outlet pipe 5 is connected to the atomizer of the spray drying tower body 1. The inlet end is connected, and valves 7 are provided on both the inlet pipe 4 and the outlet pipe 5. One end of the inlet pipe 4 that connects to the cavity 2 is located directly above the other end of the outlet pipe 5 that connects to the cavity 2. Several rubber rings 6 are detachably connected between the inlet pipe 4 and the outlet pipe 5. An annular frame 16 is placed inside the cavity 2. A limiting groove 17 is provided on one side of each rubber ring 6. A limiting ring 18 for correspondingly embedding into each limiting groove 17 is fixedly connected to the inner side of the annular frame 16. The rubber rings 6 are serrated, and the inner diameter of the several rubber rings 6 decreases sequentially from top to bottom.

[0017] The top of the cavity 2 has an opening, and a flange connects the cover 8 to the opening. The bottom of the cover 8 has an annular plate 9. The cavity 2 has a positioning groove 15 for embedding the annular plate 9. A sealing ring is provided at the flange connection between the cover 8 and the cavity 2. The bottom of the cover 8 has a support rod 10. One end of the support rod 10 has a baffle 11. The baffle 11 is directly opposite the end of the inlet pipe 4 that connects to the cavity 2. The bottom of the baffle 11 has a distribution plate 12. The distribution plate 12 is located directly above the rubber ring 6. The outer diameter of the distribution plate 12 is larger than the inner diameter of each rubber ring 6. The outer diameter of the distribution plate 12 is smaller than the inner diameter of the cavity 2.

[0018] An electromagnetic flow sensor is installed at one end of the inlet pipe 4 near the cavity 2. The electromagnetic flow sensor is electrically connected to the PLC controller. The PLC controller is electrically connected to the variable frequency motor of the peristaltic pump 3. When the electromagnetic flow sensor detects that the flow fluctuation exceeds the threshold, it dynamically adjusts the speed of the peristaltic pump 3.

[0019] The implementation method of this embodiment is as follows: When the solution needs to be dried, the peristaltic pump 3 is started first. The peristaltic pump 3 draws saturated magnesium sulfate solution from the intermediate tank through the squeezing hose. The solution enters the inlet pipe 4 through the discharge end of the peristaltic pump 3. The liquid is sprayed out from the end of the inlet pipe 4 and hits the baffle 11 connected to the bottom support rod 10 of the cover body 8. The baffle 11 offsets the impact kinetic energy of the liquid. After being buffered by the baffle 11, the liquid slides down the baffle 11 to the uniform distribution plate 12 below. The uniform distribution plate 12 can disperse the concentrated liquid into a uniform liquid flow. The uniformly distributed liquid flows through the serrated rubber rings 6 with decreasing inner diameter from top to bottom. The liquid flows steadily downward. The stable liquid is delivered to the atomizer inlet end of the spray drying tower body 1 through the outlet pipe 5, providing a stable flow of liquid for the atomizer.

[0020] When the equipment is shut down, the feed solution is changed, or cleaning is required, close valves 7 of the inlet pipe 4 and outlet pipe 5, and open the drain valve 14 on the drain pipe 13. The residual magnesium sulfate solution in the cavity 2 can be completely discharged through the drain pipe 13, preventing the feed solution from remaining in the cavity 2 and precipitating crystals. When cleaning the cavity 2 and components is required, first disassemble the flange connection between the cover 8 and the cavity 2, remove the cover 8, and then remove the annular frame 16. The inner wall of the cavity 2, the baffle 11, the distribution plate 12, and the rubber ring 6 can be thoroughly cleaned. After cleaning, reassemble the annular frame 16 and the cover 8, ensuring that the annular plate 9 is embedded in the positioning groove 15 and that the sealing ring is properly sealed, and then the equipment can be restarted.

[0021] The above descriptions are merely embodiments of this utility model, and common knowledge regarding specific structures and characteristics is not elaborated upon here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of this utility model, and these should also be considered within the scope of protection of this utility model. These modifications will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application shall be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A feeding structure for a food-grade anhydrous magnesium sulfate spray drying tower, characterized in that, The system includes a spray drying tower body (1), a cavity (2), and a peristaltic pump (3). The bottom of the cavity (2) is provided with a support column (19), which is detachably connected to the top of the spray drying tower body (1). The two sides of the cavity (2) are respectively connected to an inlet pipe (4) and an outlet pipe (5). One end of the inlet pipe (4) is connected to the discharge end of the peristaltic pump (3), and the outlet pipe (5) is connected to the inlet end of the atomizer of the spray drying tower body (1). Both the inlet pipe (4) and the outlet pipe (5) are provided with valves (7). One end of the inlet pipe (4) connected to the cavity (2) is located directly above the end of the outlet pipe (5) connected to the cavity (2). Several rubber rings (6) are detachably connected between the inlet pipe (4) and the outlet pipe (5). The rubber rings (6) are serrated.

2. The feeding structure of a food-grade anhydrous magnesium sulfate spray drying tower according to claim 1, characterized in that, The top of the cavity (2) has an opening, and a cover (8) is connected to the flange on the opening. The bottom of the cover (8) is provided with an annular plate (9). The cavity (2) is provided with a positioning groove (15) for embedding the annular plate (9). A sealing ring is provided at the flange connection between the cover (8) and the cavity (2).

3. The feeding structure of a food-grade anhydrous magnesium sulfate spray drying tower according to claim 2, characterized in that, The bottom of the cover (8) is provided with a support rod (10), and one end of the support rod (10) is provided with a baffle (11). The baffle (11) is directly opposite one end of the inlet pipe (4) that connects to the cavity (2). The bottom of the baffle (11) is provided with a distribution plate (12). The distribution plate (12) is located directly above the rubber ring (6). The outer diameter of the distribution plate (12) is larger than the inner diameter of each rubber ring (6), and the outer diameter of the distribution plate (12) is smaller than the inner diameter of the cavity (2).

4. The feeding structure of a food-grade anhydrous magnesium sulfate spray drying tower according to claim 1, characterized in that, The inner diameters of several rubber rings (6) decrease sequentially from top to bottom.

5. The feeding structure of a food-grade anhydrous magnesium sulfate spray drying tower according to claim 1, characterized in that, The bottom of the cavity (2) is provided with an empty pipe (13), and an empty valve (14) is provided on the empty pipe (13).

6. The feeding structure of a food-grade anhydrous magnesium sulfate spray drying tower according to claim 1, characterized in that, The cavity (2) contains a ring frame (16), and each rubber ring (6) has a limiting groove (17) on one side. The inner side of the ring frame (16) is provided with a limiting ring (18) for correspondingly embedding into each limiting groove (17).

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