Drying device for disodium dihydrogen pyrophosphate

Abstract

The utility model discloses a disodium dihydrogen pyrophosphate drying device which comprises a drying tank, a hot air pipe and an atomizing pipe which are connected to the top of the drying tank, a drying cyclone separator connected to the side wall of the bottom of the drying tank and a discharging auger connected to the bottom of the drying tank, and a heat exchange net, a baffle plate and a material receiving impeller are sequentially arranged in the drying tank from top to bottom. Material channels are densely arranged in the heat exchange net and the baffle plates, and a material temporary storage cavity is formed in the material receiving impeller. The effects of reducing the equipment preparation and operation cost and improving the hot air utilization rate and the product stability are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of drying devices, in particular to a drying device for disodium dihydrogen pyrophosphate. Background Art

[0002] Currently, most sodium dihydrogen pyrophosphate drying systems use a top-entry method where hot air and liquid feed enter. Specifically, the system consists of a tall drying furnace, where both hot air and liquid sodium dihydrogen pyrophosphate feed enter from the top. The hot air and liquid flow in the same direction, and through heat exchange, the liquid rapidly evaporates water, forming dry particles. However, existing drying systems have the following drawbacks:

[0003] 1. The drying furnace is too high:

[0004] In order to ensure that the liquid material can be fully dried during the falling process, the existing drying furnace is usually designed to be higher, which not only increases the manufacturing cost of the equipment, but also makes installation and maintenance more difficult.

[0005] 2. The liquid flow is long:

[0006] Since the hot air and liquid enter from the same position, the liquid has a long journey in the drying oven and needs to fall for a long time before it can be dried. This results in low drying efficiency and a long production cycle.

[0007] 3. Insufficient use of hot air:

[0008] The hot air and the liquid flow in the same direction, which may cause some of the hot air to be discharged from the bottom of the drying furnace before it fully contacts the liquid, reducing the utilization efficiency of the hot air and increasing energy consumption.

[0009] 4. Problems with the transportation of liquid and hot air:

[0010] Due to the high height of the drying furnace, the liquid material and hot air need to be pressurized when transported to the top of the drying furnace. This not only increases energy consumption, but may also lead to increased wear and failure rate of equipment, further increasing maintenance costs.

[0011] 5. Unstable product quality:

[0012] Since the residence time and temperature distribution of the liquid during the drying process are difficult to control precisely, the quality of the dried particles may be inconsistent, affecting the performance and application effect of the final product. Summary of the Invention

[0013] The technical problems to be solved by the present invention are high equipment preparation cost and operation cost, low hot air utilization rate and insufficient product stability.

[0014] In order to solve the above technical problems, the technical solution adopted by the utility model is: a drying device for disodium dihydrogen pyrophosphate, including a drying tank, a hot air pipe and an atomizing pipe connected to the top of the drying tank, a drying cyclone separator connected to the side wall of the bottom of the drying tank, and a material unloading auger connected to the bottom of the drying tank. A heat exchange network, a baffle and a material receiving impeller are arranged in sequence from top to bottom in the drying tank. Material channels are densely arranged in the heat exchange network and the baffles, and a material temporary storage chamber is provided on the material receiving impeller.

[0015] Preferably, the connection end of the hot air pipe and the drying tank is located directly above the output end of the atomizing pipe, and an atomizing nozzle is installed on the output end of the atomizing pipe.

[0016] Preferably, the heat exchange network includes horizontally arranged connecting rods and attachment rods vertically fixed to the connecting rods, the connecting rods are equidistantly arranged in the horizontal direction, and the attachment rods are equidistantly arranged in the axial direction of the connecting rods.

[0017] Preferably, drainage grooves are provided on the outer side wall of the attachment rod, and the drainage grooves are distributed at equal angles along the axis of the attachment rod.

[0018] Preferably, the baffles are vertically arranged and spaced apart in the tank body of the drying tank, and the baffles are S-shaped and continuously bent.

[0019] Preferably, the surface of the baffle is vertically provided with reinforcing ribs, and the reinforcing ribs are evenly distributed on the side walls of the baffle.

[0020] Preferably, the material receiving impeller includes a mounting shaft horizontally rotatably connected to the drying tank, mounting plates coaxially fixed to both ends of the mounting shaft, and a material receiving plate connected to opposite side walls of the two mounting plates, a gap is provided between the side wall of the mounting plate and the inner side wall of the drying tank, and a filter is provided in the middle of the material receiving plate.

[0021] The utility model provides a drying device for disodium dihydrogen pyrophosphate, which transports disodium dihydrogen pyrophosphate liquid to the top of a drying tank through an atomizing pipe and sprays it in the form of an atomizer, and then transports high-temperature air to the top of the drying tank through a hot air pipe. The disodium dihydrogen pyrophosphate liquid and the hot air exchange heat in the process of falling. In the process of falling, the liquid adheres to the heat exchange net for further heat exchange, and then enters the baffle. The liquid passes through the S-shaped flow channel between adjacent baffles and continuously exchanges heat with the surface of the baffle. Finally, the liquid and the dry powder fall on the receiving impeller, and the liquid is collected at the bottom of the temporary storage chamber of the receiving impeller, and the particles are accumulated and pass through the filter screen. The liquid is continuously dried until it is completely dry, and the powder can be discharged by rotating the receiving impeller. The above-mentioned drying device can improve the drying efficiency compared with the existing drying device through the multi-stage drying and heat exchange method. At the same time, the stroke of the liquid in the drying device is extended, and the drying device body does not need to be too long, which reduces the preparation cost of the drying device. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0023] Figure 1 It is a structural schematic diagram of an embodiment of the present utility model.

[0024] Figure 2 This is a schematic diagram of the internal structure of the drying tank in the embodiment of the present utility model.

[0025] Figure 3 It is a structural schematic diagram of the baffle in an embodiment of the present utility model.

[0026] Figure 4 It is a structural schematic diagram of the material receiving impeller in the embodiment of the present utility model.

[0027] In the figure: 1. Blower; 2. Hot air furnace; 3. Hot air pipe; 4. Drying tank; 41. Tank body; 42. Heat exchange network; 43. Baffle; 44. Material receiving impeller; 441. Mounting shaft; 442. Mounting plate; 443. Material receiving plate; 45. Drive motor; 46. Separator; 5. Atomizing pipe; 6. Unloading auger; 7. Scraper conveyor; 8. Drying cyclone separator. DETAILED DESCRIPTION

[0028] like Figure 1-4 As shown, the utility model proposes a drying device for disodium dihydrogen pyrophosphate, comprising a drying tank 4, a hot air pipe 3 and an atomizing pipe 5 connected to the top of the drying tank 4, a drying cyclone separator 8 connected to the bottom side wall of the drying tank 4, and a material unloading auger 6 connected to the bottom of the drying tank 4. A heat exchange network 42, a baffle 43 and a material receiving impeller 44 are sequentially arranged in the drying tank 4 from top to bottom. Material channels are densely arranged in the heat exchange network 42 and the baffle 43, and a material temporary storage cavity is provided on the material receiving impeller 44.

[0029] The blower 1 delivers room temperature air to the hot blast furnace 2. The heat exchange structure inside the hot blast furnace 2 heats the air, causing it to heat up and form hot air. This air is then delivered to the hot air pipe 3, and finally delivered to the drying tank 4 through the hot air pipe 3. Before the drying tank 4 is fed with material, hot air is first delivered to heat the internal structure of the drying tank 4. The material is then delivered to the drying tank 4 through the atomizing pipe 5 and the atomizing nozzle at its end. As the material flows downward from the top of the drying tank 4, it first contacts the heated heat exchange mesh 42, undergoing the first heat exchange with the heat exchange mesh 42. It then falls on the baffle 43, flows along the gap between two adjacent baffles 43, exchanges heat with the baffles 43, and finally falls on the receiving impeller 44. The temporary storage chamber on the receiving impeller 44 temporarily stores the material powder and liquid. The liquid will fall to the bottom of the temporary storage chamber. After the material powder is accumulated, the powder on the top can pass through the filter holes on the receiving impeller 44. The heated liquid continuously exchanges heat with the transported hot air and evaporates quickly. Finally, the driving motor 45 installed on the side wall of the drying tank 4 drives the receiving impeller 44 to rotate, so that the powder in the temporary storage chamber of the receiving impeller 44 falls completely. The receiving impeller 44 uses another temporary storage chamber to temporarily store the liquid. After the powder falls to the bottom of the tank body 41 of the drying tank 4, it enters the unloading auger 6 through the pipeline. The unloading auger 6 transports the powder inside to the discharge pipe at the end, and the powder enters the scraper conveyor 7, which transports the powder out. The hot air entering the tank 41 is filtered through the separator 46 and enters the drying cyclone separator 8. In the drying cyclone separator 8, the hot air flows out from the top, and the powder falls from the bottom and enters the scraper conveyor 7 through a pipeline for recovery.

[0030] like Figure 2 The connection between the hot air pipe 3 and the drying tank 4 is located directly above the output end of the atomizing pipe 5, which is equipped with an atomizing nozzle. The tank body 41 uses a top air intake method to disperse and evenly distribute the disodium dihydrogen pyrophosphate solution output from the atomizing pipe 5 to improve drying efficiency.

[0031] As a preferred embodiment of the present invention, the heat exchange network 42 includes horizontally arranged connecting rods and attachment rods vertically fixed to the connecting rods. The connecting rods are equidistantly arranged horizontally, and the attachment rods are equidistantly arranged axially. A mounting hole is provided in the middle of the attachment rod, which is inserted into the mounting hole and welded securely. The connecting rod is then installed in the tank body 41. As the disodium dihydrogen pyrophosphate liquid flows downward, the liquid adheres to the attachment rods, and the attachment rods, through heat exchange with hot air, can rapidly heat the disodium dihydrogen pyrophosphate liquid.

[0032] As a preferred embodiment of the present invention, drainage grooves are provided on the outer wall of the attachment rod, and the drainage grooves are distributed at equal angles along the axis of the attachment rod. The drainage grooves increase the surface area of ​​the attachment rod and improve the efficiency of heat exchange between the drainage grooves and the hot air or liquid.

[0033] like Figure 2 As shown, the baffles 43 are vertically arranged and spaced apart within the tank body 41 of the drying tank 4. The baffles 43 are S-shaped and continuously curved. After the disodium dihydrogen pyrophosphate liquid lands on the baffles 43, it flows downward along the baffles 43, being continuously heated as it flows until it is dried.

[0034] like Figure 3 As shown, in order to improve the strength of the baffle 43, the surface of the baffle 43 is vertically provided with reinforcing ribs, which are evenly distributed on the side wall of the baffle 43.

[0035] like Figure 2 and Figure 4 As shown. The receiving impeller 44 includes a mounting shaft 441 that rotates horizontally and is connected to the drying tank 4, mounting discs 442 coaxially fixed at both ends of the mounting shaft 441, and a receiving plate 443 connected to the opposite side walls of the two mounting discs 442. A gap is provided between the side walls of the mounting discs 442 and the inner side walls of the drying tank 4, and a filter is provided in the middle of the receiving plate 443. The two ends of the temporary storage chamber are sealed by the mounting discs 442, and the two sides of the temporary storage chamber are sealed by the receiving plate 443. The filter in the middle of the receiving plate 443 can allow the powder at the top of the temporary storage chamber to pass through. After a batch of disodium dihydrogen pyrophosphate liquid is dried, the mounting shaft 441 is driven by the driving motor 45 to rotate, thereby causing the top of the temporary storage chamber to open downward and pour the dried powder inside.

Claims

1. A drying device for disodium dihydrogen pyrophosphate, characterized in that: The drying tank (4) comprises a drying tank (4), a hot air pipe (3) and an atomizing pipe (5) connected to the top of the drying tank (4), a drying cyclone separator (8) connected to the side wall of the bottom of the drying tank (4), and a material unloading auger (6) connected to the bottom of the drying tank (4). A heat exchange network (42), a baffle (43) and a material receiving impeller (44) are sequentially arranged in the drying tank (4) from top to bottom. Material channels are densely arranged in the heat exchange network (42) and the baffle (43), and a material temporary storage cavity is provided on the material receiving impeller (44).

2. A drying device for disodium dihydrogen pyrophosphate as claimed in claim 1, characterized in that: The connection end of the hot air pipe (3) and the drying tank (4) is located directly above the output end of the atomizing pipe (5), and an atomizing nozzle is installed on the output end of the atomizing pipe (5).

3. A drying device for disodium dihydrogen pyrophosphate as claimed in claim 1, characterized in that: The heat exchange network (42) comprises horizontally arranged connecting rods and attachment rods vertically fixed to the connecting rods, the connecting rods being arranged at equal distances in the horizontal direction, and the attachment rods being arranged at equal distances in the axial direction of the connecting rods.

4. A drying device for disodium dihydrogen pyrophosphate as claimed in claim 3, characterized in that: Drainage grooves are provided on the outer side wall of the attachment rod, and the drainage grooves are distributed at equal angles along the axis of the attachment rod.

5. A drying device for disodium dihydrogen pyrophosphate as claimed in claim 1, characterized in that: The baffles (43) are vertically arranged and spaced apart in the tank body (41) of the drying tank (4). The baffles (43) are S-shaped and continuously bent.

6. A drying device for disodium dihydrogen pyrophosphate as claimed in claim 5, characterized in that: The surface of the baffle (43) is vertically provided with reinforcing ribs, and the reinforcing ribs are evenly distributed on the side wall of the baffle (43).

7. A drying device for disodium dihydrogen pyrophosphate as claimed in claim 1, characterized in that: The receiving impeller (44) includes a mounting shaft (441) horizontally rotatably connected to the drying tank (4), mounting discs (442) coaxially fixed to both ends of the mounting shaft (441), and a receiving plate (443) connected to opposite side walls of the two mounting discs (442), a gap being provided between the side wall of the mounting disc (442) and the inner side wall of the drying tank (4), and a filter screen being provided in the middle of the receiving plate (443).

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