Potassium nitrate production device

Abstract

The invention discloses a potassium nitrate production device, and relates to the technical field of potassium nitrate production, the potassium nitrate production device comprises a first-stage drying mechanism, the first-stage drying mechanism comprises a sealing cylinder, a drying cylinder is arranged in the sealing cylinder, one end of the sealing cylinder is provided with a feeding pipe, the other end of the sealing cylinder is provided with a discharging pipe, and the feeding pipe and the discharging pipe are both connected with the drying cylinder; a transmission rod is arranged in the drying cylinder, spiral blades are installed on the side wall of the transmission rod, the drying cylinder comprises a medium channel, a first annular pipe and a second annular pipe are arranged between the drying cylinder and the sealing cylinder and are both connected with a medium channel pipeline, and a medium inlet pipe is arranged on the side wall of the first annular pipe. A medium outlet pipe is arranged on the side wall of the second annular pipe. Therefore, the potassium nitrate crystals can continuously enter the drying cylinder through the feeding pipe, and are discharged through the discharging pipe of the drying cylinder after being dried, so that the continuous production drying process is realized, and the manpower investment is reduced.

Description

Technical Field

[0001] This invention relates to the field of potassium nitrate production technology, and more particularly to a potassium nitrate production apparatus. Background Technology

[0002] Potassium nitrate has various uses, such as in fireworks production, fertilizer, catalysts, and pharmaceuticals. Its production process typically includes physicochemical reactions, crystallization, filtration, and drying, resulting in potassium nitrate powder. Because potassium nitrate is readily soluble in water, the powder easily absorbs moisture and clumps, affecting its subsequent use. Therefore, how to thoroughly dry potassium nitrate and reduce clumping is a current challenge in potassium nitrate production.

[0003] Existing potassium nitrate drying methods generally employ fluidized bed vibration drying. For example, Chinese patent application number "CN202321372570.4" discloses a "three-layer vibrating fluidized bed drying line for potassium nitrate," which includes a first bucket elevator and a second bucket elevator, with a disc cooler between them, a disc dryer on one side of the second bucket elevator, and a fluidized bed dryer on one side of the disc dryer. The first and second bucket elevators lift and transfer the hopper containing potassium nitrate, the disc cooler cools the dried potassium nitrate raw material, and the fluidized bed dryer dries the raw material. This invention, by setting up a discharge mechanism, discharges the dried potassium nitrate for secondary drying and subsequent transfer and cooling. The entire process is mechanized, reducing manual intervention, greatly improving mechanization and drying efficiency, while also preventing workers from suffering health damage due to prolonged contact with potassium nitrate.

[0004] For example, Chinese patent application number "CN202222582593.X" discloses "a potassium nitrate dryer," which includes "a blower; the input end of the blower is connected to a feed inlet, and the output end of the blower is connected to a guide pipe. Through a combined processing structure, the fluidized bed mainly consists of a blower, dryer, vibrating feeder, hot induced draft fan, electrical control cabinet, ventilation pipes, exhaust pipes, etc. The safety interlock control cabinet button ensures the safety of the system equipment startup. The exhaust port collects waste gas and feed dust through a recycling device, achieving the environmental protection requirement of zero pollution discharge of wastewater and dust. By using a vibrating motor as the driving force, it features stable operation, low noise, long service life, and convenient maintenance. Vibration promotes the formation of the flow state, increases the effective heat transfer coefficient, so the thermal efficiency is high, the fluidization is uniform and stable, and there are no dead beds, channeling, or boiling phenomena, which can obtain uniformly dried and cooled potassium nitrate products."

[0005] However, fluidized bed drying suffers from difficulties in continuous production. After drying is complete, all material must be discharged before new material can be added, and manual assistance is required during the discharge process to prevent material accumulation. Therefore, achieving continuous production and reducing labor input remains a significant challenge. Summary of the Invention

[0006] To address the above-mentioned shortcomings, the purpose of this invention is to provide a potassium nitrate production apparatus that solves the problem of the difficulty in continuous production of existing potassium nitrate drying equipment.

[0007] To solve the above-mentioned technical problems, the technical solution of the present invention is as follows: A potassium nitrate production apparatus includes a primary drying mechanism. The primary drying mechanism includes a sealed cylinder containing a drying cylinder. The length of the drying cylinder is the same as the length of the sealed cylinder. A feed pipe is located at one end of the sealed cylinder, and a discharge pipe is located at the other end. Both the feed pipe and the discharge pipe are connected to the drying cylinder. A first motor is mounted on the side wall of the sealed cylinder. A transmission rod is located inside the drying cylinder, and spiral blades are mounted on the side wall of the transmission rod. A power rod is mounted at the end of the transmission rod away from the discharge pipe, and a transmission wheel is mounted on the side wall of the power rod. A power wheel is mounted on the power end of the first motor, and the transmission wheel and the power wheel are connected by a belt. The drying cylinder includes a medium channel. A first annular pipe and a second annular pipe are arranged between the drying cylinder and the sealed cylinder, both surrounding the drying cylinder. The medium channel is located between the first and second annular pipes, and both the first and second annular pipes are connected to the medium channel pipeline. A medium inlet pipe is located on the side wall of the first annular pipe, and a medium outlet pipe is located on the side wall of the second annular pipe.

[0008] The drying cylinder has a side wall comprising several fixed arc plates and several screening screens, which are alternately arranged; the medium channel is located inside the fixed arc plates; and a waste discharge pipe is provided on the side wall of the sealing cylinder, which is located at the end of the sealing cylinder away from the discharge pipe.

[0009] The inner cavity of the drying cylinder is cylindrical, and both the fixed arc plate and the screening screen are part of the cylinder.

[0010] The transmission rod is hollow, and several air outlet holes are opened on the side wall of the transmission rod. An adapter is provided at the end of the transmission rod away from the power rod. The transmission rod and the adapter are rotatably connected. A hot air inlet pipe is connected to the end of the adapter away from the transmission rod. A bag filter is connected to the end of the waste discharge pipe away from the sealing cylinder.

[0011] It also includes a secondary drying mechanism, and a pulverizing mechanism is provided between the secondary drying mechanism and the primary drying mechanism. The pulverizing mechanism includes a pulverizing chamber, the top of which is connected to the discharge pipe, and the bottom of which is connected to the secondary drying mechanism. A pulverizing roller is installed inside the pulverizing chamber, and a second motor is installed on the side wall of the pulverizing chamber. The second motor is poweredly connected to the pulverizing roller.

[0012] The secondary drying mechanism includes a drying tank and a heating assembly. The drying tank contains a stirring rod, a drying tray, and a scraping assembly. The stirring rod includes a feeding section and a supporting section. The feeding section is hollow, and the supporting section is connected to the end of the feeding section furthest from the crushing chamber. The top of the feeding section is connected to the crushing chamber, and several feeding holes are provided at the bottom of the feeding section. The drying tray surrounds the supporting section and includes a carrying area and a lowering area. The scraping assembly includes a scraper plate located at the top of the drying tray, with its bottom contacting the top of the carrying area. The scraper plate is inclined towards the lowering area. The drying tray is hollow, and the heating assembly includes a diversion pipe and a collection pipe. The drying tray is located between the diversion pipe and the collection pipe, and both the diversion pipe and the collection pipe are connected to the drying tray.

[0013] The bottom of the feeding section is provided with a conical material distribution component, and a plurality of feeding holes are arranged around the conical material distribution component.

[0014] The drying tray includes a first tray body and a second tray body, and the scraping assembly includes a first scraping frame and a second scraping frame. The first tray body and the second tray body are alternately arranged along the length direction of the stirring rod. The first scraping frame is configured to cooperate with the first tray body, and the second scraping frame is configured to cooperate with the second tray body. The bearing area of ​​the first tray body is arranged around the stirring rod, and the lowering area of ​​the first tray body is arranged around the bearing area. The lowering area of ​​the second tray body is arranged around the stirring rod, and the bearing area of ​​the second tray body is arranged around the lowering area.

[0015] The structure of the first scraper is the same as that of the second scraper, but the tilting direction of the scraper plate of the first scraper is opposite to that of the scraper plate of the second scraper.

[0016] The bottom of the drying tank is connected to a feeding auger, the top of the drying tank is equipped with a power motor, the side wall of the feeding section is equipped with a limit wheel, the power end of the power motor is connected to the limit wheel by a belt, and the top of the feeding section is rotatably connected to the bottom of the crushing chamber.

[0017] After adopting the above technical solution, the beneficial effects of the present invention are: First, the drying drum consists of a fixed arc plate and a screening screen. The fixed arc plate guides the flow of the heating medium, ensuring that the potassium nitrate crystals are fully heated as the spiral blades propel them forward. The heated, moist potassium nitrate crystals produce water vapor, which is separated from the potassium nitrate by the screening screen, guaranteeing thorough drying. Second, potassium nitrate crystals are continuously fed into the drying drum through the feed pipe and discharged through the discharge pipe after drying. This achieves a continuous drying process, reducing labor input. Attached Figure Description

[0018] Figure 1 This is a structural diagram of a potassium nitrate production unit; Figure 2 This is a schematic diagram of the secondary drying mechanism; Figure 3 This is a structural diagram of the primary drying mechanism; Figure 4 for Figure 2 A magnified view of part 'a'; Figure 5 This is a cross-sectional view of the drying cylinder; Figure 6 This is a top view of the crushing mechanism; Figure 7 Here is a structural diagram of the stirring rod; Figure 8 This is a structural diagram of the first disk. Figure 9 This is a structural diagram of the second disk.

[0019] In the diagram: 1-First-stage drying mechanism, 11-Sealed cylinder, 12-Drying cylinder, 13-Feed pipe, 14-Discharge pipe, 15-First motor, 16-Transmission rod, 17-Spiral blade, 18-Power rod, 19-Transmission wheel, 110-Power wheel, 111-Media channel, 112-First annular pipe, 113-Second annular pipe, 114-Media inlet pipe, 115-Media outlet pipe, 116-Waste outlet pipe, 117-Fixed arc plate, 118-Screening screen, 119-Air outlet, 120-Adapter, 121-Hot air inlet pipe, 2-Bag filter, 3-Hot air generator 4-Medium heating equipment, 5-Pulverizing mechanism, 51-Pulverizing chamber, 52-Pulverizing roller, 53-Second motor, 6-Secondary drying mechanism, 61-Drying tank, 62-Stirring rod, 63-Drying disc, 64-Scraping assembly, 65-Discharging section, 66-Support section, 67-Discharging hole, 68-Bearing area, 69-Lowering area, 610-Scraping plate, 611-Diversion pipe, 612-Collection pipe, 613-First disc, 614-Second disc, 615-First scraper frame, 616-Second scraper frame, 617-Power motor, 618-Limiting wheel, 7-Discharging auger. Detailed Implementation

[0020] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0021] like Figure 1-9 As shown, a potassium nitrate production apparatus includes a primary drying mechanism 1. The primary drying mechanism 1 includes a sealing cylinder 11, inside which a drying cylinder 12 is disposed. The length direction of the drying cylinder 12 is the same as that of the sealing cylinder 11. A feed pipe 13 is provided at one end of the sealing cylinder 11, and a discharge pipe 14 is provided at the other end of the sealing cylinder 11. Both the feed pipe 13 and the discharge pipe 14 are connected to the drying cylinder 12. A first motor 15 is installed on the side wall of the sealing cylinder 11. A transmission rod 16 is disposed inside the drying cylinder 12. Spiral blades 17 are installed on the side wall of the transmission rod 16. A power rod 18 is installed at the end of the transmission rod 16 away from the discharge pipe 14. A transmission wheel 19 is installed on the side wall of the power rod 18. A power wheel 110 is installed at the power end of the first motor 15. The transmission wheel 19 and the power wheel 110 are connected by a belt. The drying cylinder 12 includes a medium channel 111. A first annular pipe 112 and a second annular pipe 113 are arranged between the drying cylinder 12 and the sealing cylinder 11. The first annular pipe 112 and the second annular pipe 113 are both arranged around the drying cylinder 12. The medium channel 111 is located between the first annular pipe 112 and the second annular pipe 113. The first annular pipe 112 and the second annular pipe 113 are both connected to the medium channel 111. A medium inlet pipe 114 is provided on the side wall of the first annular pipe 112, and a medium outlet pipe 115 is provided on the side wall of the second annular pipe 113.

[0022] Both the medium inlet pipe 114 and the medium outlet pipe 115 are connected to the medium heating device 4. The high-temperature medium is sent to the first annular pipe 112 through the medium inlet pipe 114, and then evenly distributed into the medium channel 111 through the first annular pipe 112. When the high-temperature medium flows in the medium channel 111, it exchanges heat with the drying cylinder 12, thereby adjusting the temperature in the drying cylinder 12 to the suitable temperature for potassium nitrate drying. To facilitate the recovery of the high-temperature medium, this scheme introduces a second annular pipe 113 and a medium outlet pipe 115. The second annular pipe 113 is used to recover the high-temperature medium after heating, and it is sent to the medium heating device 4 for repeated heating and reuse through the medium outlet pipe 115.

[0023] Once the drying cylinder 12 reaches the appropriate temperature, the potassium nitrate raw material enters the drying cylinder 12 through the feed pipe 13. Subsequently, the first motor 15 starts, and the first motor 15 drives the transmission rod 16 to rotate via a belt and a power rod 18. When the transmission rod 16 rotates, it drives the spiral blades 17 to rotate. At this time, the potassium nitrate will be pushed towards the discharge pipe 14 by the spiral blades 17. During this process, the potassium nitrate comes into contact with the inner wall of the drying cylinder 12 and undergoes heat exchange, that is, the potassium nitrate is heated. This accelerates the separation of water from potassium nitrate, thereby completing the drying process of potassium nitrate.

[0024] This design allows the feed pipe 13 to continuously receive the produced potassium nitrate. After being heated by the drying cylinder 12, the dried potassium nitrate is discharged through the discharge pipe 14. The entire process is continuous, reducing manpower input and the frequency of downtime.

[0025] While the spiral blades 17 propel the potassium nitrate forward, they also drive the potassium nitrate to mix continuously, so that the potassium nitrate can be heated evenly, which ensures the drying speed of the potassium nitrate.

[0026] When the drying cylinder 12 is a sealed environment, the dried potassium nitrate is still mixed with water vapor. To prevent water vapor from recombine with potassium nitrate and to prevent potassium nitrate from becoming damp again, as follows: Figure 3-5 As shown, the sidewall of the drying cylinder 12 includes several fixed arc plates 117 and several sieves 118, which are alternately arranged. The medium channel 111 is located inside the fixed arc plates 117, and a waste discharge pipe 116 is provided on the sidewall of the sealing cylinder 11, located at the end of the sealing cylinder 11 away from the discharge pipe 14. In this design, both the fixed arc plates 117 and the sieves 118 are made of corrosion-resistant and heat-conducting materials. The fixed arc plates 117 are used to guide the heating medium, and the sieves 118 are used to separate water vapor and potassium nitrate. In this design, the potassium nitrate is continuously heated as it moves forward, and the generated water vapor will pass through the sieves 118 into the sealing cylinder 11, and then be discharged through the waste discharge pipe 116.

[0027] During the separation process, water vapor carries away some of the extremely small potassium nitrate particles. To reduce waste, a bag filter 2 is connected to the waste discharge pipe 116.

[0028] In order to facilitate the uniform propulsion of potassium nitrate by the spiral blades 17, the inner cavity of the drying cylinder 12 is cylindrical, and the fixed arc plate 117 and the sieve screen 118 are both part of the cylinder.

[0029] To accelerate the separation of water vapor and potassium nitrate, the transmission rod 16 is hollow, and several air outlet holes 119 are opened on the side wall of the transmission rod 16. An adapter 120 is provided at the end of the transmission rod 16 away from the power rod 18. The transmission rod 16 and the adapter 120 are rotatably connected. A hot air inlet pipe 121 is connected to the end of the adapter 120 away from the transmission rod 16. A bag filter dust collector 2 is connected to the end of the waste discharge pipe 116 away from the sealing cylinder 11.

[0030] One end of the hot air inlet pipe 121 is connected to a hot air generator 3. The hot air generator 3 directs hot air through the hot air inlet pipe 121 to the adapter 120, and then along the drive rod 16 to each air outlet 119, where it is discharged. During its flow, the hot air carries away the moisture contained in the potassium nitrate and guides the water vapor and some potassium nitrate particles along the waste outlet pipe 116 to the bag filter 2. This accelerates the separation of potassium nitrate from water vapor and prevents water vapor from mixing with potassium nitrate again, thus reducing the probability of potassium nitrate becoming damp again. As the hot air flows through the drive rod 16, it exchanges heat with the drive rod 16, which in turn transfers heat to the spiral blades 17. The spiral blades 17 also heat the potassium nitrate as they propel it forward, further accelerating the drying process.

[0031] like Figure 2 , Figure 6-9 As shown, to further dry potassium nitrate, a secondary drying mechanism 6 is also included. A pulverizing mechanism 5 is provided between the secondary drying mechanism 6 and the primary drying mechanism 1. The pulverizing mechanism 5 includes a pulverizing chamber 51, the top of which is connected to the discharge pipe 14, and the bottom of which is connected to the secondary drying mechanism 6. A pulverizing roller 52 is installed inside the pulverizing chamber 51, and a second motor 53 is installed on the side wall of the pulverizing chamber 51, which is poweredly connected to the pulverizing roller 52. When potassium nitrate first enters the drying cylinder 12, some potassium nitrate particles may clump together. The internal moisture of the clumped potassium nitrate is difficult to remove, leading to insufficient drying. Therefore, this solution introduces the pulverizing mechanism 5 and the secondary drying mechanism 6. The pulverizing mechanism 5 receives potassium nitrate from the primary drying mechanism 1, uses the rotating pulverizing roller 52 to pulverize the clumped potassium nitrate, and then sends the potassium nitrate to the secondary drying mechanism 6 for further drying, thereby further removing moisture.

[0032] To facilitate further drying of potassium nitrate crystal powder, the secondary drying mechanism 6 includes a drying tank 61 and a heating assembly. The drying tank 61 contains a rotating stirring rod 62, a drying disc 63, and a scraping assembly 64. The stirring rod 62 includes a feeding section 65 and a supporting section 66. The feeding section 65 is hollow, and the supporting section 66 is connected to the end of the feeding section 65 furthest from the crushing chamber 51. The top of the feeding section 65 is connected to the crushing chamber 51, and the bottom of the feeding section 65 has several feeding holes 67. The drying disc 63 is arranged around the supporting section 66. The drying tray 63 includes a supporting area 68 and a lowering area 69. The scraping assembly 64 includes a scraper 610, which is located at the top of the drying tray 63. The bottom of the scraper 610 contacts the top of the supporting area 68, and the scraper 610 is inclined towards the lowering area 69. The drying tray 63 is hollow. The heating assembly includes a diversion pipe 611 and a collection pipe 612. The drying tray 63 is located between the diversion pipe 611 and the collection pipe 612. Both the diversion pipe 611 and the collection pipe 612 are connected to the drying tray 63.

[0033] After being crushed, the potassium nitrate crystals sequentially reach the feeding section 65, the feeding hole 67, and the drying tray 63. The scraper assembly 64 is connected to the stirring rod 62, meaning that the scraper assembly 64 rotates under the drive of the stirring rod 62. This causes the scraper plate 610 to rotate along with the stirring rod 62. Since the scraper plate 610 is inclined towards the lowering area 69, the potassium nitrate powder reaching the drying tray 63 will continuously move towards the lowering area 69 under the rotation of the scraper plate 610. During this process, the potassium nitrate powder is continuously spread out. In this scheme, both the diversion pipe 611 and the collection pipe 612 are connected to the medium heating device 4. The heated high-temperature medium reaches the drying tray 63 through the diversion pipe 611. After heating the drying tray 63, the high-temperature medium reaches the collection pipe 612 and returns to the medium heating device 4 through the collection pipe 612. At this time, the potassium nitrate powder spread out on the drying tray 63 is fully heated, thus achieving further heating.

[0034] To ensure that potassium nitrate powder is evenly distributed and to prevent excessive accumulation in one area, a conical material distribution component is provided at the bottom of the feeding section 65, and several feeding holes 67 are arranged around the conical material distribution component.

[0035] To facilitate multi-stage drying, the drying tray 63 includes a first tray body 613 and a second tray body 614, and the scraping assembly 64 includes a first scraper frame 615 and a second scraper frame 616. Scraper plates 610 are installed at the bottom of both the first scraper frame 615 and the second scraper frame 616. The first tray body 613 and the second tray body 614 are alternately arranged along the length of the stirring rod 62. The first scraper frame 615 is configured to cooperate with the first tray body 613, and the second scraper frame 616 is configured to cooperate with the second tray body 614. The bearing area 68 of the first tray body 613 is arranged around the stirring rod 62, and the lowering area 69 of the first tray body 613 is arranged around the bearing area 68. The lowering area 69 of the second tray body 614 is arranged around the stirring rod 62, and the bearing area 68 of the second tray body 614 is arranged around the lowering area 69. In use, the first disc 613 is matched with the feeding hole 67. Potassium nitrate powder, after passing through the feeding hole 67, first reaches the first disc 613. Then, under the action of the scraper 610, the potassium nitrate powder gradually covers the bearing area 68 and moves towards the release area 69 at the edge. As the first scraper 615 rotates, the potassium nitrate powder on the first disc 613 passes through the release area 69 to the bearing area 68 on the second disc 614. Subsequently, under the action of the second scraper 616, the potassium nitrate powder on the second disc 614 moves towards the release area 69 in the center region. This design allows the potassium nitrate powder to be continuously spread out, reducing the amount of potassium nitrate powder per unit area, thus enabling faster drying of the potassium nitrate powder.

[0036] Preferably, the structure of the first scraper 615 is the same as that of the second scraper 616, and the inclination direction of the scraper plate 610 of the first scraper 615 is opposite to that of the scraper plate 610 of the second scraper 616.

[0037] To facilitate the rotation of the stirring rod 62, a feeding auger 7 is connected to the bottom of the drying tank 61, a power motor 617 is installed on the top of the drying tank 61, a limit wheel 618 is installed on the side wall of the feeding section 65, the power end of the power motor 617 is connected to the limit wheel 618 by a belt, and the top of the feeding section 65 is rotatably connected to the bottom of the crushing chamber 51.

[0038] It is worth noting that an exhaust pipe is installed on the top of the side wall of the drying tank 61, and the exhaust pipe is connected to the bag filter.

[0039] In summary, this solution has the following advantages: First, the drying cylinder 12 is composed of a fixed arc plate 117 and a screening screen 118. The fixed arc plate 117 can guide the flow of the heating medium, which allows the potassium nitrate crystals to be fully heated when the spiral blades 17 push them forward. The wet potassium nitrate crystals will generate water vapor after heating, and the water vapor can be separated from the potassium nitrate by passing through the screening screen 118, thus ensuring that the potassium nitrate crystals are fully dried. Second, potassium nitrate crystals can continuously enter the drying cylinder 12 through the feed pipe 13, and after drying, they will be discharged through the discharge pipe 14 of the drying cylinder 12. This realizes a continuous production drying process and reduces the input of manpower.

[0040] This invention is not limited to the specific embodiments described above. Any modifications made by those skilled in the art based on the above concept without creative effort are within the scope of protection of this invention.

Claims

1. A potassium nitrate production apparatus, comprising a primary drying mechanism (1), wherein the primary drying mechanism (1) comprises a sealing cylinder (11), and a drying cylinder (12) is disposed inside the sealing cylinder (11). The length direction of the drying cylinder (12) is the same as the length direction of the sealing cylinder (11). A feed pipe (13) is disposed at one end of the sealing cylinder (11), and a discharge pipe (14) is disposed at the other end of the sealing cylinder (11). Both the feed pipe (13) and the discharge pipe (14) are connected to the drying cylinder (12). A first motor (15) is installed on the side wall of the drying cylinder (11), a transmission rod (16) is provided inside the drying cylinder (12), a spiral blade (17) is installed on the side wall of the transmission rod (16), a power rod (18) is installed at the end of the transmission rod (16) away from the discharge pipe (14), a transmission wheel (19) is installed on the side wall of the power rod (18), a power wheel (110) is installed at the power end of the first motor (15), and the transmission wheel (19) and the power wheel (110) are connected by a belt. The drying cylinder (12) includes a medium channel (111). A first annular pipe (112) and a second annular pipe (113) are provided between the drying cylinder (12) and the sealing cylinder (11). The first annular pipe (112) and the second annular pipe (113) are both arranged around the drying cylinder (12). The medium channel (111) is located between the first annular pipe (112) and the second annular pipe (113). The first annular pipe (112) and the second annular pipe (113) are both connected to the medium channel (111). A medium inlet pipe (114) is provided on the side wall of the first annular pipe (112), and a medium outlet pipe (115) is provided on the side wall of the second annular pipe (113).

2. The potassium nitrate production apparatus according to claim 1, characterized in that, The side wall of the drying cylinder (12) includes several fixed arc plates (117) and several screening screens (118), which are alternately arranged; the medium channel (111) is located inside the fixed arc plate (117), and a waste discharge pipe (116) is provided on the side wall of the sealing cylinder (11), which is located at the end of the sealing cylinder (11) away from the discharge pipe (14).

3. The potassium nitrate production apparatus according to claim 2, characterized in that, The inner cavity of the drying cylinder (12) is cylindrical, and the fixed arc plate (117) and the screening screen (118) are both part of the cylinder.

4. The potassium nitrate production apparatus according to claim 2, characterized in that, The transmission rod (16) is hollow and has several air outlet holes (119) on its side wall. An adapter (120) is provided at the end of the transmission rod (16) away from the power rod (18). The transmission rod (16) is rotatably connected to the adapter (120). A hot air inlet pipe (121) is connected at the end of the adapter (120) away from the transmission rod (16). A bag filter (2) is connected at the end of the waste discharge pipe (116) away from the sealing cylinder (11).

5. The potassium nitrate production apparatus according to claim 1, characterized in that, It also includes a secondary drying mechanism (6), and a pulverizing mechanism (5) is provided between the secondary drying mechanism (6) and the primary drying mechanism (1). The pulverizing mechanism (5) includes a pulverizing chamber (51), the top of the pulverizing chamber (51) is connected to the discharge pipe (14), the bottom of the pulverizing chamber (51) is connected to the secondary drying mechanism (6), a pulverizing roller (52) is installed inside the pulverizing chamber (51), and a second motor (53) is installed on the side wall of the pulverizing chamber (51). The second motor (53) is poweredly connected to the pulverizing roller (52).

6. The potassium nitrate production apparatus according to claim 5, characterized in that, The secondary drying mechanism (6) includes a drying tank (61) and a heating assembly. The drying tank (61) contains a stirring rod (62), a drying disc (63), and a scraping assembly (64). The stirring rod (62) includes a feeding section (65) and a supporting section (66). The feeding section (65) is hollow. The supporting section (66) is connected to the end of the feeding section (65) away from the crushing chamber (51). The top of the feeding section (65) is connected to the crushing chamber (51). Several feeding holes (67) are provided at the bottom of the feeding section (65). The drying disc (63) is arranged around the supporting section (66). The drying disc (63) includes a support... The loading area (68) and the unloading area (69) are provided. The scraping assembly (64) includes a scraper (610), which is located on the top of the drying tray (63). The bottom of the scraper (610) is in contact with the top of the loading area (68). The scraper (610) is inclined toward the unloading area (69). The drying tray (63) is hollow. The heating assembly includes a diversion pipe (611) and a collection pipe (612). The drying tray (63) is located between the diversion pipe (611) and the collection pipe (612). The diversion pipe (611) and the collection pipe (612) are both connected to the drying tray (63).

7. The potassium nitrate production apparatus according to claim 6, characterized in that, The bottom of the feeding section (65) is provided with a conical material distribution component, and a plurality of feeding holes (67) are arranged around the conical material distribution component.

8. The potassium nitrate production apparatus according to claim 6, characterized in that, The drying tray (63) includes a first tray body (613) and a second tray body (614). The scraping assembly (64) includes a first scraper frame (615) and a second scraper frame (616). The first tray body (613) and the second tray body (614) are alternately arranged along the length direction of the stirring rod (62). The first scraper frame (615) is configured to cooperate with the first tray body (613), and the second scraper frame (616) is configured to cooperate with the second tray body (614). The bearing area (68) of the first tray body (613) is arranged around the stirring rod (62), and the lowering area (69) of the first tray body (613) is arranged around the bearing area (68). The lowering area (69) of the second tray body (614) is arranged around the stirring rod (62), and the bearing area (68) of the second tray body (614) is arranged around the lowering area (69).

9. The potassium nitrate production apparatus according to claim 8, characterized in that, The structure of the first scraper (615) is the same as that of the second scraper (616), and the tilting direction of the scraper plate (610) of the first scraper (615) is opposite to that of the scraper plate (610) of the second scraper (616).

10. The potassium nitrate production apparatus according to claim 6, characterized in that, The bottom of the drying tank (61) is connected to a feeding auger (7), the top of the drying tank (61) is equipped with a power motor (617), the side wall of the feeding section (65) is equipped with a limiting wheel (618), the power end of the power motor (617) is connected to the limiting wheel (618) by a belt, and the top of the feeding section (65) is rotatably connected to the bottom of the crushing chamber (51).

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