Efficient desublimation cooling treatment system for phosphorus pentoxide flue gas

Abstract

The utility model discloses an efficient desublimation cooling treatment system for phosphorus pentoxide flue gas, which comprises a flue gas delivery pipe, a cooling tank and a settling tank, a flue gas distributor and a stirring cooler are arranged in the cooling tank, the flue gas delivery pipe is communicated with the flue gas distributor, the stirring cooler comprises a central pipe, an upper cooling ring pipe and a lower cooling ring pipe, a plurality of cooling straight pipes are evenly distributed and installed between the upper cooling ring pipe and the lower cooling ring pipe, a plurality of stirring rods are installed on the outer wall of each cooling straight pipe, a water outlet pipe is installed at the lower end of the center pipe through a lower rotating connector, and a driving mechanism in transmission connection with the center pipe is arranged at the top of the cooling tank. A water inlet pipe is arranged at the upper end of the central pipe through an upper rotating joint, a cooling water circulating assembly is arranged between the water inlet pipe and the water outlet pipe, and the top of the cooling tank is communicated with the settling tank through a discharge port. According to the device, the cooling time of the phosphorus pentoxide flue gas is shortened, the production efficiency is improved, and the operation cost is effectively reduced.

Description

Technical Field

[0001] This utility model belongs to the field of phosphorus chemical production technology, specifically relating to a high-efficiency sublimation cooling treatment system for phosphorus pentoxide flue gas. Background Technology

[0002] Phosphorus pentoxide is a commonly used raw material and reagent in the chemical industry, widely applied in various fields. High-quality phosphorus pentoxide can also be used to produce high-purity phosphoric acid of various concentrations, especially polyphosphoric acid. Currently, the industrial preparation of phosphorus pentoxide generally adopts the oxidative combustion method: using yellow phosphorus as raw material, the yellow phosphorus is heated and melted and then added to a combustion furnace. Dry air is introduced into the combustion furnace to react and burn with the yellow phosphorus, generating phosphorus pentoxide flue gas. The phosphorus pentoxide flue gas is then cooled and settled to produce the finished phosphorus pentoxide product. In the aforementioned production process, the sublimation and cooling of gaseous phosphorus pentoxide flue gas into solid phosphorus pentoxide is a crucial step in phosphorus pentoxide production. The sublimation cooling device is currently a key piece of equipment in phosphorus pentoxide production. However, the existing sublimation cooling devices for phosphorus pentoxide flue gas employ two main methods: First, a water-cooled jacket is used to cool the outer wall of the device. This water-cooled jacket has a slow cooling rate and cannot thoroughly cool the interior of the device, resulting in incomplete and rapid sublimation of the phosphorus pentoxide flue gas. This leads to a low yield of solid phosphorus pentoxide and a long sublimation cooling time for gaseous phosphorus pentoxide, resulting in low production efficiency. Second, the water-cooled jacket uses flowing cold water, which consumes a large amount of water, leading to high operating costs. Therefore, it is objectively necessary to develop a high-efficiency sublimation cooling system for phosphorus pentoxide flue gas with a reasonable structural design, a large cooling range, and the ability to reduce operating costs while improving production efficiency. Summary of the Invention

[0003] The purpose of this utility model is to provide a high-efficiency sublimation cooling system for phosphorus pentoxide flue gas with reasonable structural design, large cooling range, high yield, and effective improvement of production efficiency.

[0004] The purpose of this utility model is achieved as follows: It includes a flue gas conveying pipe, a cooling tank, and a settling tank. The cooling tank is equipped with a flue gas distributor and a stirring cooler. The flue gas distributor is located at the top of the cooling tank, and the flue gas conveying pipe is connected to the flue gas distributor. The stirring cooler includes a central pipe, an upper cooling ring pipe, and a lower cooling ring pipe. The central pipe is located at the center of the cooling tank. The upper cooling ring pipe is connected to the upper part of the central pipe through multiple upper branch pipes, and the lower cooling ring pipe is connected to the lower part of the central pipe through multiple lower branch pipes. The upper and lower cooling ring pipes... Multiple cooling straight pipes are evenly distributed throughout the tank. Each cooling straight pipe has multiple stirring rods installed on its outer wall. A lower rotary joint is installed at the lower end of the central pipe, and a water outlet pipe extending to the outside of the cooling tank is installed on the lower rotary joint. The upper end of the central pipe extends to the top of the cooling tank. A drive mechanism connected to the central pipe is installed at the top of the cooling tank. An upper rotary joint is installed at the upper end of the central pipe, and a water inlet pipe is installed on the upper rotary joint. A cooling water circulation assembly is installed between the water inlet pipe and the water outlet pipe. The top of the cooling tank is connected to the settling tank through a discharge port.

[0005] Compared with existing technologies, the advantages of this device are as follows: First, the flue gas distributor in this device can evenly distribute the phosphorus pentoxide flue gas within the cooling tank, allowing it to make uniform contact with the stirred cooler, thereby improving the sublimation cooling effect of the phosphorus pentoxide flue gas. Simultaneously, the structure of the stirred cooler is optimized, with cooling water flowing between the rotating central pipe, upper branch pipe, upper cooling ring pipe, cooling straight pipe, lower cooling ring pipe, and lower branch pipe. This increases the cooling range of the cooling tank, allowing the phosphorus pentoxide flue gas to be fully and efficiently cooled. Furthermore, it effectively cools the phosphorus pentoxide flue gas... The device employs a stirring process to ensure thorough contact between the phosphorus pentoxide flue gas and the cooling water. This accelerates the cooling of the phosphorus pentoxide flue gas and shortens the cooling time, thereby increasing production efficiency and significantly improving the yield of solid phosphorus pentoxide. Secondly, the cooling water circulation system in this unit filters and cools the circulating cooling water in the cooling tank before reusing it. This avoids water waste and effectively reduces operating costs. This device boasts advantages such as a reasonable structural design, excellent cooling effect, low operating costs, and high production efficiency, making it easy to promote and use. Attached Figure Description

[0006] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0007] In the diagram: 1-Flue gas conveying pipe, 2-Cooling tank, 21-Central pipe, 22-Upper cooling ring pipe, 23-Lower cooling ring pipe, 24-Upper branch pipe, 25-Cooling straight pipe, 26-Stirring rod, 27-Lower rotary joint, 28-Water outlet pipe, 29-Upper rotary joint, 210-Water inlet pipe, 211-Flue gas ring pipe, 212-Air jet nozzle, 213-Drive motor, 214-Driving bevel gear, 215-Driven bevel gear, 216-Cutlet holder, 217-Scraper, 218-Bottom scraper, 219-Temperature sensor, 220-Lower branch pipe, 3-Settling tank, 4-Circulation pipe, 5-Recovery tank, 6-Filter, 7-Circulation pump, 8-Cooling shell, 9-Cooling pipe. Detailed Implementation

[0008] The present invention will be further described below with reference to the accompanying drawings, but this description is not intended to limit the present invention in any way. Any changes or improvements made based on the teachings of the present invention shall fall within the protection scope of the present invention.

[0009] like Figure 1 As shown, this utility model includes a flue gas conveying pipe 1, a cooling tank 2, and a settling tank 3. The settling tank 3 is a structure used in the prior art. The cooling tank 2 is equipped with a flue gas distributor and a stirring cooler. The flue gas distributor is located at the top of the cooling tank 2, allowing for uniform distribution of phosphorus pentoxide flue gas within the cooling tank 2. The flue gas conveying pipe 1 is connected to the flue gas distributor. The stirring cooler includes a central pipe 21, an upper cooling ring pipe 22, and a lower cooling ring pipe 23. The central pipe 21 is located at the center of the cooling tank 2. The upper cooling ring pipe 22 is connected to the upper part of the central pipe 21 via multiple upper branch pipes 24, which are evenly distributed circumferentially between the upper cooling ring pipe 22 and the central pipe 21. The lower cooling ring pipe 23 is connected to the lower part of the central pipe 21 via multiple lower branch pipes 220, which are evenly distributed circumferentially within the lower cooling ring pipe 23. Between the central tube 21 and the upper cooling ring tube 22 and the lower cooling ring tube 23, multiple cooling straight tubes 25 are evenly distributed. The cooling straight tubes 25 are evenly distributed circumferentially between the upper cooling ring tube 22 and the lower cooling ring tube 23. Multiple stirring rods 26 are installed on the outer wall of each cooling straight tube 25. A lower rotating joint 27 is installed at the lower end of the central tube 21. A water outlet pipe 28 extending to the outside of the cooling tank 2 is installed on the lower rotating joint 27. The upper end of the central tube 21 extends to the top of the cooling tank 2. A drive mechanism connected to the central tube 21 is provided at the top of the cooling tank 2. An upper rotating joint 29 is installed at the upper end of the central tube 21. A water inlet pipe 210 is provided on the upper rotating joint 29. A cooling water circulation assembly is provided between the water inlet pipe 210 and the water outlet pipe 28. The top of the cooling tank 2 is connected to the settling tank 3 through a discharge port.

[0010] The working process of this device is as follows: The phosphorus pentoxide flue gas generated by the combustion tower first enters the flue gas distributor through the flue gas conveying pipe 1. After being distributed by the flue gas distributor, the phosphorus pentoxide flue gas will be evenly distributed in the cooling tank 2. During the process of conveying phosphorus pentoxide flue gas from the flue gas conveying pipe 1 to the cooling tank 2, the drive mechanism drives the central pipe 21, upper branch pipe 24, upper cooling ring pipe 22, cooling straight pipe 25, lower cooling ring pipe 23, lower branch pipe 220 and stirring rod 26 to rotate, and delivers cooling water to the upper rotating joint 29 through the water inlet pipe 210. The cooling water in the upper rotating joint 29 will flow in the central pipe 21, upper branch pipe 24, upper cooling ring pipe 22, cooling straight pipe 25, lower cooling ring pipe 23 and lower branch pipe 220, and finally enter the lower rotating joint 27, and then be discharged through the water outlet pipe 28. Cooling water flows between the rotating central pipe 21, upper branch pipe 24, upper cooling ring pipe 22, cooling straight pipe 25, lower cooling ring pipe 23, and lower branch pipe 220. On the one hand, this increases the cooling range of the cooling tank 2, allowing the phosphorus pentoxide flue gas to be cooled fully and efficiently. On the other hand, it agitates the phosphorus pentoxide flue gas, ensuring it is in full contact with the cooling water. This increases the cooling speed and shortens the cooling time of the phosphorus pentoxide flue gas, thereby improving production efficiency and significantly increasing the yield of solid phosphorus pentoxide. The cooling water discharged from the outlet pipe 28 enters the cooling water circulation assembly, where it is cooled and filtered before returning to the inlet pipe 210 for reuse. This avoids water waste and effectively reduces operating costs.

[0011] Furthermore, to improve the uniform distribution of phosphorus pentoxide flue gas, the flue gas distributor includes a flue gas ring pipe 211 and jet nozzles 212. The jet nozzles 212 can be structures used in the prior art, and finished products can be directly purchased according to the pressure and diameter used. The flue gas ring pipe 211 is fixedly installed inside the cooling tank 2. There are multiple jet nozzles 212, which are evenly distributed inside the flue gas ring pipe 211. The phosphorus pentoxide flue gas enters the flue gas ring pipe 211 and is then ejected through the jet nozzles 212, thus enabling the phosphorus pentoxide flue gas to be evenly distributed in the cooling tank 2.

[0012] Furthermore, the drive mechanism includes a drive motor 213, a driving bevel gear 214, and a driven bevel gear 215. The drive motor 213 is a structure used in the prior art. The drive motor 213 is mounted above the cooling tank 2. The driving bevel gear 214 is mounted on the output shaft of the drive motor 213. The driven bevel gear 215 is mounted on the outer wall of the central tube 21 and meshes with the driving bevel gear 214. In use, the drive motor 213 drives the driving bevel gear 214 to rotate. The rotation of the driving bevel gear 214 drives the driven bevel gear 215 to rotate. The rotation of the driven bevel gear 215 drives the central tube 21, the upper branch tube 24, the upper cooling ring tube 22, etc. to rotate synchronously.

[0013] Furthermore, to prevent solid phosphorus pentoxide from adhering to the inner wall of the cooling tank after sublimation and cooling, thus affecting subsequent use, a scraping assembly connected to a central tube is provided inside the cooling tank 2. The scraping assembly includes a blade holder 216 and a scraper 217. The blade holder 216 is vertically arranged along the side wall of the cooling tank 2, and the upper end of the blade holder 216 is fixedly connected to the upper part of the central tube 21 via an L-shaped connecting rod. The scraper 217 is mounted on the blade holder 216 and slides against the side wall of the cooling tank 2. When the central tube 21 rotates under the drive of the drive mechanism, it can drive the blade holder 216 to rotate along the inner wall of the cooling tank 2 via the connecting rod. The rotation of the blade holder 216 can drive the scraper 217 to contact the inner wall of the cooling tank 2. During the contact process with the cooling tank 2, the scraper 217 can scrape off the solid phosphorus pentoxide adhering to the inner wall of the cooling tank 2.

[0014] Furthermore, in order to facilitate the timely discharge of solid phosphorus pentoxide after deposition and cooling into the settling tank 3 from the discharge port and to prevent solid phosphorus pentoxide from accumulating at the bottom of the cooling tank 2, 2 to 3 bottom scrapers 218 are evenly distributed at the bottom of the cooling tank 2. The bottom scrapers 218 are fixedly connected to the lower cooling ring pipe 23 through a connecting plate. When the lower cooling ring pipe 23 rotates, it can drive the bottom scrapers 218 to rotate, and the rotating bottom scrapers 218 can scrape the solid phosphorus pentoxide towards the discharge port.

[0015] Furthermore, in order to achieve the recycling of cooling water and save water, the cooling water circulation assembly includes a circulation pipe 4 installed between the inlet pipe 210 and the outlet pipe 28. A recovery tank 5, a filter 6, and a circulation pump 7 are sequentially arranged on the circulation pipe 4 along the water flow direction. A semiconductor cooler is installed in the recovery tank 5. The semiconductor cooler is a structure in the prior art that can cool hot water in a short time. A water supply pipe is provided on the recovery tank 5. The cooling water discharged from the outlet pipe 28 first enters the recovery tank 5. After being cooled by the semiconductor cooler, the cooling water is filtered by the filter 6 and then, under the action of the circulation pump 7, it can enter the inlet pipe 210 through the circulation pipe 4 for recycling. If the cooling water level in the recovery tank 5 is low, cooling water can be added to the cooling tank 2 through the water supply pipe.

[0016] To facilitate the detection of the cooling temperature inside the cooling tank 2, the cooling tank 2 is equipped with a temperature sensor 219. The temperature sensor 219 is a structure used in the prior art, and a finished product is directly purchased according to the usage requirements. Furthermore, to improve the sublimation cooling effect of phosphorus pentoxide flue gas, a cooling shell 8 is spaced apart on the outer side of the cooling tank 2. The cavity between the cooling shell 8 and the cooling tank 2 is a cooling cavity. A cooling pipe 9 is spirally wound inside the cooling cavity. The top outlet of the cooling pipe 9 is connected to the outlet of the circulation pipe 4 through an inlet branch pipe, and the bottom outlet of the cooling pipe 9 is connected to the inlet of the circulation pipe through an outlet branch pipe. Control valves are installed on both the inlet and outlet branch pipes. If the temperature sensor 219 detects that the temperature inside the cooling tank 2 is too high, cold water can be injected into the cooling pipe 9. As the cold water spirals within the cooling tank 2, it can further cool the cooling tank 2, preventing the high temperature from affecting the sublimation cooling effect of the phosphorus pentoxide flue gas.

Claims

1. A high-efficiency sublimation cooling treatment system for phosphorus pentoxide flue gas, comprising a flue gas conveying pipe (1), a cooling tank (2), and a settling tank (3), characterized in that: The cooling tank (2) is equipped with a flue gas distributor and a stirring cooler. The flue gas distributor is located at the top of the cooling tank (2). The flue gas conveying pipe (1) is connected to the flue gas distributor. The stirring cooler includes a central pipe (21), an upper cooling ring pipe (22), and a lower cooling ring pipe (23). The central pipe (21) is located at the center of the cooling tank (2). The upper cooling ring pipe (22) is connected to the upper part of the central pipe (21) through multiple upper branch pipes (24). The lower cooling ring pipe (23) is connected to the lower part of the central pipe (21) through multiple lower branch pipes (220). Multiple cooling straight pipes (25) are evenly distributed between the upper cooling ring pipe (22) and the lower cooling ring pipe (23). Each cooling straight pipe (25) Multiple stirring rods (26) are installed on the outer wall of the cooling tank (2). A lower rotating joint (27) is installed at the lower end of the central tube (21). A water outlet pipe (28) extending to the outside of the cooling tank (2) is installed on the lower rotating joint (27). The upper end of the central tube (21) extends to the top of the cooling tank (2). A drive mechanism connected to the central tube (21) is provided at the top of the cooling tank (2). An upper rotating joint (29) is installed at the upper end of the central tube (21). A water inlet pipe (210) is provided on the upper rotating joint (29). A cooling water circulation assembly is provided between the water inlet pipe (210) and the water outlet pipe (28). The top of the cooling tank (2) is connected to the settling tank (3) through the discharge port.

2. The high-efficiency sublimation cooling treatment system for phosphorus pentoxide flue gas according to claim 1, characterized in that: The flue gas distributor includes a flue gas ring pipe (211) and jet nozzles (212). The flue gas ring pipe (211) is fixedly installed inside the cooling tank (2). There are multiple jet nozzles (212), which are evenly distributed and installed on the inner side of the flue gas ring pipe (211).

3. The high-efficiency sublimation cooling treatment system for phosphorus pentoxide flue gas according to claim 1, characterized in that: The drive mechanism includes a drive motor (213), a driving bevel gear (214), and a driven bevel gear (215). The drive motor (213) is mounted above the cooling tank (2). The driving bevel gear (214) is mounted on the output shaft of the drive motor (213). The driven bevel gear (215) is mounted on the outer wall of the central tube (21) and meshes with the driving bevel gear (214).

4. The high-efficiency sublimation cooling treatment system for phosphorus pentoxide flue gas according to claim 1, characterized in that: The cooling tank (2) is equipped with a wall scraping assembly connected to a central tube. The wall scraping assembly includes a blade holder (216) and a scraper (217). The blade holder (216) is vertically arranged along the side wall of the cooling tank (2). The upper end of the blade holder (216) is fixedly connected to the upper part of the central tube (21) through an L-shaped connecting rod. The scraper (217) is mounted on the blade holder (216) and slides in cooperation with the side wall of the cooling tank (2).

5. The high-efficiency sublimation cooling treatment system for phosphorus pentoxide flue gas according to claim 1, characterized in that: Two to three bottom scrapers (218) are evenly distributed at the bottom of the cooling tank (2), and the bottom scrapers (218) are fixedly connected to the lower cooling ring pipe (23) through a connecting plate.

6. The high-efficiency sublimation cooling treatment system for phosphorus pentoxide flue gas according to claim 1, characterized in that: The cooling water circulation assembly includes a circulation pipe (4) installed between the inlet pipe (210) and the outlet pipe (28). A recovery tank (5), a filter (6) and a circulation pump (7) are sequentially arranged on the circulation pipe (4) along the water flow direction. A semiconductor cooler is installed inside the recovery tank (5), and a water supply pipe is installed on the recovery tank (5).

7. The high-efficiency sublimation cooling treatment system for phosphorus pentoxide flue gas according to claim 1, characterized in that: The cooling tank (2) is equipped with a temperature sensor (219).

8. The high-efficiency sublimation cooling treatment system for phosphorus pentoxide flue gas according to claim 1, characterized in that: The cooling tank (2) is provided with a cooling shell (8) at intervals on the outside. The cavity between the cooling shell (8) and the cooling tank (2) is a cooling cavity. A cooling pipe (9) is spirally wound in the cooling cavity. The top outlet of the cooling pipe (9) is connected to the outlet of the circulation pipe (4) through an inlet branch pipe. The bottom outlet of the cooling pipe (9) is connected to the inlet of the circulation pipe through an outlet branch pipe. A control valve is provided on both the inlet branch pipe and the outlet branch pipe.

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