Multistage cooling device for phosphorus pentoxide

Abstract

The utility model discloses a multistage cooling device for phosphorus pentoxide, and belongs to the technical field of phosphorus chemical industry. The device comprises a front screw conveyor, a rear screw conveyor, a storage bin and four cooling towers connected in series, cooling jackets and vibration structures are arranged on the outer side walls of the cooling towers, and a circular cooling water tank is arranged at the top of the first cooling tower; the lower parts of the first cooling tower and the second cooling tower are connected, discharge ports at the bottoms of the first cooling tower and the second cooling tower are connected with the front screw conveyer through expansion joints, the upper parts of the second cooling tower and the third cooling tower are connected, the lower parts of the third cooling tower and the fourth cooling tower are connected, and discharge ports at the bottoms of the third cooling tower and the fourth cooling tower are connected with the rear screw conveyer; discharge ports of the front spiral conveyor and the rear spiral conveyor are connected with the storage bin; the circular cooling water tank contains or does not contain cooling water, the tops of the four cooling towers are not provided with cooling jackets, and the top of the first cooling tower is not provided with a vibration structure.

Description

Technical Field

[0001] The utility model belongs to the technical field of phosphorus chemical industry, and particularly relates to a multi-stage cooling device for phosphorus pentoxide. Background Art

[0002] At present, the preparation of phosphorus pentoxide in industry generally adopts the oxidation combustion method: yellow phosphorus is used as the raw material, and the yellow phosphorus is heated and melted and then added to the combustion furnace. The dried air is introduced into the combustion furnace to react and burn with the yellow phosphorus to generate phosphorus pentoxide flue gas, and then the phosphorus pentoxide flue gas is cooled and settled to make the finished phosphorus pentoxide product. Usually, the phosphorus pentoxide flue gas is obtained through a phosphorus burning tower, and the phosphorus pentoxide flue gas is cooled through multiple cooling towers (in series), and the phosphorus pentoxide flue gas is cooled through multiple settling towers (in series).

[0003] For example, the patent with application number CN202120468538.0 discloses a cooling device for phosphorus pentoxide, including an air inlet pipe from a phosphorus burning tower and multiple cooling towers, the multiple cooling towers are arranged side by side and their upper parts are connected in series in sequence through K-shaped connectors, the air inlet pipe is connected to the top of the first cooling tower, the cooling tower outer jacket is provided with a cooling jacket, and the outer wall of the cooling tower is provided with multiple first pneumatic hammers; the cooling device also includes a water-cooling circulation structure, a vibration structure, a circular cooling water trough and a strip cooling water trough, the top of the first cooling tower is not provided with a cooling jacket, the circular cooling water trough is provided at the top of the first cooling tower, and the strip cooling water trough is provided near the circular cooling water trough It is arranged on one side near the phosphorus burning tower and along the direction of the air inlet pipe, the liquid level of the strip cooling water tank is higher than the liquid level of the circular cooling water tank, the air inlet pipe is located in the strip cooling water tank and immersed in the liquid levels of the strip cooling water tank and the circular cooling water tank, the strip cooling water tank is provided with a water outlet pipe with a valve on one side close to the circular cooling water tank, the water outlet pipe can guide the water of the strip cooling water tank into the circular cooling water tank and the end thereof is located above the circular cooling water tank, the circular cooling water tank and the strip cooling water tank are both connected to the hot water inlet of the water cooling circulation structure through a pipeline, the cold water outlet of the water cooling circulation structure is connected to the strip cooling water tank through a pipeline, and a vibration structure is provided on the lower side of each K-shaped connector.

[0004] When the applicant used the aforementioned cooling device for phosphorus pentoxide to cool phosphorus pentoxide, the following problems were found:

[0005] (1) The cooling water in the circular cooling water tank will slowly corrode the top of the first cooling tower. The top of the first cooling tower is immersed in water for a long time, and the service life of the cooling tower will be reduced;

[0006] (2) The main function of a cooling tower is to cool down the air. However, a small amount of phosphorus pentoxide still adheres to the inner wall of the cooling tower. Under the action of the vibrating structure (intermittent action) on the side and top of the cooling tower, the phosphorus pentoxide adhered to the inner wall will fall off and deposit at the bottom of the cooling tower, and needs to be discharged regularly. Summary of the invention

[0007] In order to solve the above problems, the embodiment of the utility model provides a multi-stage cooling device for phosphorus pentoxide. The circular cooling water tank may or may not contain cooling water according to the ambient temperature, thereby reducing the contact time between the cooling water and the top of the first cooling tower and extending the service life of the first cooling tower. According to the special connection method of the four cooling towers, a corresponding structure is used to collect the phosphorus pentoxide output by the cooling towers. The technical solution is as follows:

[0008] The utility model embodiment provides a multi-stage cooling device for phosphorus pentoxide, including four cooling towers connected in series, the outer side walls of the cooling towers are provided with cooling jackets 6 and vibration structures 7, the top of the first cooling tower 1 is provided with a circular cooling water tank 8; the multi-stage cooling device also includes a front screw conveyor 9, a rear screw conveyor 10 and a storage bin 11, the first cooling tower 1 is connected to the lower part of the second cooling tower 2 and the discharge ports at the bottom thereof are connected to the front screw conveyor 9 through a vertically arranged expansion joint 12, the second cooling tower 2 and the third cooling tower 1 are connected to the front screw conveyor 9 through a vertically arranged expansion joint 12, The upper part of the tower 3 is connected, the lower part of the third cooling tower 3 and the fourth cooling tower 4 are connected and the discharge ports at the bottom are connected to the rear screw conveyor 10; the discharge ports of the front screw conveyor 9 and the rear screw conveyor 10 are connected to the top of the storage bin 11; the circular cooling water trough 8 is filled with or not filled with cooling water, no cooling jacket 6 is set on the top of the four cooling towers, no vibration structure 7 is set on the top of the first cooling tower 1, and at least one vibration structure 7 is set on the top of the second cooling tower 2, the third cooling tower 3 and the fourth cooling tower 4.

[0009] Specifically, the lower parts of the first cooling tower 1 and the second cooling tower 2 in the embodiment of the utility model are connected by a K-shaped connector 5, the upper parts of the second cooling tower 2 and the third cooling tower 3 are connected by a K-shaped connector 5, and the lower parts of the third cooling tower 3 and the fourth cooling tower 4 are connected by a K-shaped connector 5, and at least one vibration structure 7 is provided on the K-shaped connector 5.

[0010] Among them, the outer walls of the front screw conveyor 9, the rear screw conveyor 10 and the storage bin 11 in the embodiment of the utility model are all provided with a cooling jacket 6.

[0011] Wherein, the first cooling tower 1 and the second cooling tower 2 in the embodiment of the utility model are both provided with a rotating raking structure 13 on the conical bottom.

[0012] Specifically, the vibration structure 7 in the embodiment of the utility model includes a pneumatic hammer and a pneumatic vibrator. The number of vibration structures 7 at the top of the second cooling tower 2 is greater than the number of vibration structures 7 at the top of the third cooling tower 3, and the number of vibration structures 7 at the top of the third cooling tower 3 is greater than the number of vibration structures 7 at the top of the fourth cooling tower 4.

[0013] Furthermore, a temperature sensor is provided at the top of the first cooling tower 1 in the embodiment of the utility model and located in the circular cooling water trough 8. The bottom of the circular cooling water trough 8 is connected to the hot water inlet of the water cooling circulation structure through a pipeline with a valve, and the water cooling circulation structure is lower than the circular cooling water trough 8; when the temperature detected by the temperature sensor is greater than or equal to a predetermined value, the valve is closed, and the circular cooling water trough 8 is filled with cooling water; when the temperature detected by the temperature sensor is less than the predetermined value, the valve is opened, and the circular cooling water trough 8 is not filled with cooling water.

[0014] Specifically, the four cooling towers in the embodiment of the utility model are arranged side by side, and the front screw conveyor 9 and the rear screw conveyor 10 are arranged along the side-by-side direction of the cooling towers. The front screw conveyor 9 is located directly below the first cooling tower 1 and the second cooling tower 2, and the rear screw conveyor 10 is located directly below the third cooling tower 3 and the fourth cooling tower 4. The storage bin 11 is located directly below between the front screw conveyor 9 and the rear screw conveyor 10.

[0015] Furthermore, the top of the cooling tower in the embodiment of the utility model is horizontal and is provided with a metal reinforcing beam 14 in a crisscross shape.

[0016] The beneficial effects brought by the technical solution provided by the embodiment of the utility model are:

[0017] (1) The circular cooling water tank may or may not contain cooling water depending on the ambient temperature, thereby reducing the contact time between the cooling water and the top of the first cooling tower and extending the service life of the first cooling tower.

[0018] (2) According to the special connection mode of the four cooling towers, the corresponding structure is used to collect the phosphorus pentoxide output by the cooling towers. Specifically, since the screw conveyor may conduct air, the front screw conveyor is used to collect the output of the first cooling tower and the second cooling tower (the lower parts of the two cooling towers are connected) to avoid connecting with other cooling towers; the rear screw conveyor is used to collect the output of the third cooling tower and the fourth cooling tower (the lower parts of the two cooling towers are connected) to avoid connecting with other cooling towers.

[0019] (3) Since the temperature of the phosphorus pentoxide output by the first cooling tower and the second cooling tower is high, the first cooling tower and the second cooling tower are both equipped with a rotating rake structure and an expansion joint, which can not only break up the phosphorus pentoxide, but also avoid blockage and damage to the equipment due to thermal expansion and contraction.

[0020] (4) No cooling jacket is installed on the top of the four cooling towers (phosphorus pentoxide is quickly discharged by the K-shaped connector and has little chance of contacting the top of the cooling tower), which simplifies the structure of the cooling tower, facilitates heat transfer in the circular cooling water tank, and facilitates the vibration structure to shake the material off the inner wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of a multi-stage cooling device for phosphorus pentoxide in an embodiment of the utility model;

[0022] Figure 2 It is a schematic diagram of the structure of the top of the first cooling tower;

[0023] Figure 3 It is a principle block diagram of the combination of a circular cooling water tank and a water cooling circulation structure.

[0024] In the figure: 1 the first cooling tower, 2 the second cooling tower, 3 the third cooling tower, 4 the fourth cooling tower, 5 K-shaped connector, 6 cooling jacket, 7 vibration structure, 8 circular cooling water trough, 9 front screw conveyor, 10 rear screw conveyor, 11 storage bin, 12 expansion joint, 13 rotary rake structure, 14 metal reinforcement beam. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the utility model clearer, the utility model will be further described in detail below with reference to the accompanying drawings.

[0026] Example 1

[0027] See also Figure 1-2 Embodiment 1 provides a multi-stage cooling device for phosphorus pentoxide, which includes a front screw conveyor 9, a rear screw conveyor 10, a storage bin 11 and four cooling towers. The four cooling towers are connected in series and arranged side by side. The top of the first cooling tower 1 is connected to the top of the phosphorus burning tower through an air inlet pipe, the first cooling tower 1 and the lower part of the second cooling tower 2 are connected through a K-shaped connector 5, the upper part of the second cooling tower 2 and the third cooling tower 3 are connected through a K-shaped connector 5, the lower part of the third cooling tower 3 and the fourth cooling tower 4 are connected through a K-shaped connector 5, and the upper part of the fourth cooling tower 4 is connected to the sedimentation tower through a K-shaped connector 5. A circular cooling water trough 8 is provided at the top of the first cooling tower 1. The circular cooling water trough 8 may or may not contain cooling water according to the water temperature or ambient temperature in the circular cooling water trough 8. The structure of the circular cooling water trough 8 can refer to the description of the application number CN202120468538.0. The circular cooling water trough 8 can receive the cooling water flowing out of the strip cooling water trough and output it to the water cooling circulation structure.

[0028] Among them, the front screw conveyor 9 and the rear screw conveyor 10 in this embodiment are both arranged along the parallel direction of the cooling towers, the front screw conveyor 9 is located directly below the first cooling tower 1 and the second cooling tower 2, the rear screw conveyor 10 is located directly below the third cooling tower 3 and the fourth cooling tower 4, and the storage bin 11 is located directly below the front screw conveyor 9 and the rear screw conveyor 10. The discharge ports at the bottom of the first cooling tower 1 and the second cooling tower 2 are connected to the upper side of the front screw conveyor 9 through the vertically arranged expansion joint 12, and the discharge ports at the bottom of the third cooling tower 3 and the fourth cooling tower 4 are directly connected to the rear screw conveyor 10. The discharge ports of the front screw conveyor 9 and the rear screw conveyor 10 are both connected to the top of the storage bin 11, and the driving motors of the front screw conveyor 9 and the rear screw conveyor 10 are both arranged at one end away from the storage bin 11.

[0029] Among them, the outer wall of the cooling tower in this embodiment is provided with a cooling jacket 6 (connected to the water cooling circulation structure through a pipeline) and a vibration structure 7. No cooling jacket 6 is provided on the top of the four cooling towers, and their tops are all horizontal. A metal reinforcing beam 14 in a crisscross shape is provided on the top, and a manhole (inspection port) is provided in the middle position of the top. No vibration structure 7 is provided on the top of the first cooling tower 1, and at least one vibration structure 7 is provided on the top of the second cooling tower 2, the third cooling tower 3 and the fourth cooling tower 4. At least one vibration structure 7 is provided on the K-shaped connector 5. Cooling jackets 6 are provided on the outer walls of the front screw conveyor 9, the rear screw conveyor 10 and the storage bin 11. Among them, the vibration structure 7 includes a pneumatic percussion hammer and a pneumatic vibrator, etc. The number of vibration structures 7 on the top of the second cooling tower 2 is K2, the number of vibration structures 7 on the top of the third cooling tower 3 is K3, and the number of vibration structures 7 on the top of the fourth cooling tower 4 is K4, K2>K3>K4. Specifically, a pneumatic hammer is provided on the side wall of the cooling tower (a through hole for installing a pneumatic hammer is provided on the cooling jacket 6); a pneumatic hammer and a pneumatic vibrator are provided on the top of the cooling tower and the K-shaped connector 5. The manhole is provided at the center hole of the metal reinforcement beam 14, and the vibration structure 7 is arranged away from the metal reinforcement beam 14. The metal reinforcement beam 14 has two functions: one is to improve the strength of the cooling tower, and the other is to improve the heat dissipation effect of the top of the cooling tower (the metal reinforcement beam 14 is equivalent to a metal heat sink).

[0030] Among them, the first cooling tower 1 and the second cooling tower 2 in the embodiment of the utility model are both provided with a rotating raking structure 13 on the conical bottom to avoid blockage. The specific description of the rotating raking structure 13 can be found in the application number CN202120468562.4.

[0031] Example 2

[0032] See also Figure 3Embodiment 2 provides a multi-stage cooling device for phosphorus pentoxide, and its structure is basically the same as that of embodiment 1, except that: a temperature sensor is provided at the top of the first cooling tower 1 in this embodiment and located in the circular cooling water tank 8, a strip cooling water tank is provided at the top of the phosphorus burning tower, the strip cooling water tank extends toward the first cooling tower 1, the liquid level of the strip cooling water tank is higher than the liquid level of the circular cooling water tank 8, the air inlet pipe is located in the strip cooling water tank and immersed in the liquid levels of the strip cooling water tank and the circular cooling water tank 8, a water outlet pipe with a valve (first control valve) is provided on one side of the strip cooling water tank close to the circular cooling water tank 8, the water outlet pipe can guide the water of the strip cooling water tank into the circular cooling water tank 8 and its end is located above the circular cooling water tank 8. The bottom of the circular cooling water tank 8 is connected to the hot water inlet of the water cooling circulation structure through a pipeline with a valve (third valve), the bottom of the strip cooling water tank is connected to the hot water inlet of the water cooling circulation structure through a pipeline with a valve (second valve), and the cold water outlet of the water cooling circulation structure is connected to the strip cooling water tank through a pipeline. The above structure can be found in the description of the patent with application number CN202120468538.0. The water-cooling circulation structure is lower than the circular cooling water tank 8. When the temperature detected by the temperature sensor (the temperature at the top of the first cooling tower 1) is greater than or equal to the predetermined value, the second control valve is closed, the first control valve and the third control valve are opened, and the circular cooling water tank 8 is filled with cooling water. The strip cooling water tank, the circular cooling water tank 8 and the water-cooling circulation structure constitute a circulating water cooling system. When the temperature detected by the temperature sensor is less than the predetermined value, the second control valve and the third control valve are opened, the first control valve is closed, the circular cooling water tank 8 is not filled with cooling water, and the strip cooling water tank and the water-cooling circulation structure constitute a circulating water cooling system. More specifically, for simple control, the circular cooling water tank 8 can be filled with cooling water in summer and autumn, and the circular cooling water tank 8 can be not filled with cooling water in spring and winter.

[0033] Example 3

[0034] Embodiment 3 provides a multi-stage cooling device for phosphorus pentoxide, and its structure is basically the same as that of Embodiment 1, except that: four cooling towers are arranged side by side in front and back, the front screw conveyor 9 and the rear screw conveyor 10 are arranged in the front-to-back direction, and the dimensions of the cooling towers are: diameter 2790mm, height 5250mm. Four pneumatic hammers and four pneumatic vibrators are arranged on the top of the second cooling tower 2, two pneumatic hammers and two pneumatic vibrators are arranged on the top of the third cooling tower 3; and one pneumatic hammer and one pneumatic vibrator are arranged on the top of the fourth cooling tower 4.

[0035] Among them, the "first", "second", "third" and "fourth" in this embodiment are only used for distinction and have no other special meanings.

[0036] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A multi-stage cooling device for phosphorus pentoxide, comprising four cooling towers connected in series, wherein the outer walls of the cooling towers are each provided with a cooling jacket (6) and a vibration structure (7), and the top of the first cooling tower (1) is provided with a circular cooling water tank (8); characterized in that: The multi-stage cooling device further comprises a front screw conveyor (9), a rear screw conveyor (10) and a storage bin (11); the first cooling tower (1) and the second cooling tower (2) are connected at their lower parts and the discharge ports at their bottoms are connected to the front screw conveyor (9) through a vertically arranged expansion joint (12); the second cooling tower (2) and the third cooling tower (3) are connected at their upper parts; the third cooling tower (3) and the fourth cooling tower (4) are connected at their lower parts and the discharge ports at their bottoms are connected to the rear screw conveyor (10); the discharge ports of the front screw conveyor (9) and the rear screw conveyor (10) are connected to the top of the storage bin (11); the circular cooling water trough (8) may or may not contain cooling water; the tops of the four cooling towers are not provided with cooling jackets (6); the top of the first cooling tower (1) is not provided with a vibration structure (7); the tops of the second cooling tower (2), the third cooling tower (3) and the fourth cooling tower (4) are each provided with at least one vibration structure (7).

2. The multi-stage cooling device for phosphorus pentoxide according to claim 1, characterized in that: The lower parts of the first cooling tower (1) and the second cooling tower (2) are connected via a K-shaped connector (5), the upper parts of the second cooling tower (2) and the third cooling tower (3) are connected via a K-shaped connector (5), and the lower parts of the third cooling tower (3) and the fourth cooling tower (4) are connected via a K-shaped connector (5), wherein at least one vibration structure (7) is provided on the K-shaped connector (5).

3. The multi-stage cooling device for phosphorus pentoxide according to claim 1, characterized in that: The outer walls of the front screw conveyor (9), the rear screw conveyor (10) and the material storage bin (11) are all provided with cooling jackets (6).

4. The multi-stage cooling device for phosphorus pentoxide according to claim 1, characterized in that: A rotating raking structure (13) is provided on the conical bottom of the first cooling tower (1) and the second cooling tower (2).

5. The multi-stage cooling device for phosphorus pentoxide according to claim 1, characterized in that: The vibration structure (7) comprises a pneumatic hammer and a pneumatic vibrator, the number of the vibration structures (7) at the top of the second cooling tower (2) is greater than the number of the vibration structures (7) at the top of the third cooling tower (3), and the number of the vibration structures (7) at the top of the third cooling tower (3) is greater than the number of the vibration structures (7) at the top of the fourth cooling tower (4).

6. The multi-stage cooling device for phosphorus pentoxide according to claim 1, characterized in that: A temperature sensor is provided at the top of the first cooling tower (1) and in a circular cooling water tank (8). The bottom of the circular cooling water tank (8) is connected to a hot water inlet of a water cooling circulation structure through a pipeline with a valve. The water cooling circulation structure is lower than the circular cooling water tank (8). When the temperature detected by the temperature sensor is greater than or equal to a predetermined value, the valve is closed and the circular cooling water tank (8) is filled with cooling water. When the temperature detected by the temperature sensor is less than the predetermined value, the valve is opened and the circular cooling water tank (8) is not filled with cooling water.

7. The multi-stage cooling device for phosphorus pentoxide according to claim 1, characterized in that: Four cooling towers are arranged side by side, the front screw conveyor (9) and the rear screw conveyor (10) are arranged along the parallel direction of the cooling towers, the front screw conveyor (9) is located directly below the first cooling tower (1) and the second cooling tower (2), the rear screw conveyor (10) is located directly below the third cooling tower (3) and the fourth cooling tower (4), and the storage bin (11) is located directly below between the front screw conveyor (9) and the rear screw conveyor (10).

8. The multi-stage cooling device for phosphorus pentoxide according to claim 1, characterized in that: The top of the cooling tower is horizontal and is provided with a metal reinforcing beam (14) in a crisscross shape.

Images