Production system of powdery phosphorus pentoxide

Abstract

The utility model discloses a production system of powdery phosphorus pentoxide, and belongs to the technical field of phosphorus chemical industry. The system comprises a phosphorus burning tower, a cooling device, a sedimentation device, a first powder storage bin, a second conveying structure, a rotary vibration screen, a second powder storage bin and a particle storage bin, the phosphorus burning tower, the cooling device, the sedimentation device and the first powder storage bin are sequentially connected, and the cooling device comprises a plurality of cooling towers connected in series. The settling device comprises a plurality of settling towers connected in series and a first conveying structure for conveying phosphorus pentoxide output by the settling towers to the first powder storage bin; a vibration structure is arranged on the outer wall of each cooling tower; the second conveying structure is used for conveying phosphorus pentoxide output by the cooling tower to a feeding opening of the rotary vibration sieve; cooling jackets are arranged outside the cooling tower, the first powder storage bin, the second powder storage bin and the particle storage bin; the rotary vibration sieve is of a closed structure and located above the second powder storage bin and the particle storage bin, and a fine material outlet and a coarse material outlet of the rotary vibration sieve are connected with the second powder storage bin and the particle storage bin respectively.

Description

Technical Field

[0001] The utility model belongs to the technical field of phosphorus chemical industry, and particularly relates to a production system of powdered 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 CN202120468720.6 discloses a compact phosphorus pentoxide production system, including a cooling water supply device, an exhaust gas treatment device, and a phosphorus burning tower, a cooling device, a sedimentation device and a storage bin connected in sequence, wherein the cooling device includes a plurality of cooling towers connected in series in sequence, the sedimentation device includes a plurality of sedimentation towers connected in series in sequence and a conveying structure for delivering the phosphorus pentoxide output from the sedimentation tower to the storage bin, the cooling tower is provided with a cooling jacket, and the cooling jacket is connected to the cooling water supply device through a pipeline; the system also includes a four-layer platform, the phosphorus burning tower, the cooling device and the sedimentation device are respectively arranged at the front, middle and rear of the four-layer platform, The phosphorus burning towers are arranged side by side on the left and right, the phosphorus burning tower is located in front of the first cooling tower, and the multiple sedimentation towers are distributed in multiple rows side by side on the left and right, each row is composed of at least two sedimentation towers arranged side by side front and back, and the storage bin is located at the rear and lower side of the sedimentation device; the phosphorus burning tower and the cooling tower are arranged on the bottom to the third floor of the four-story platform, the sedimentation tower is arranged on the first and second floors of the four-story platform, the storage bin is arranged on the bottom floor of the four-story platform, the cooling water supply device is arranged on the third floor of the four-story platform, the conveying structure is arranged on the first floor of the four-story platform and its output end is to the bottom floor of the four-story platform, and the exhaust gas treatment device is connected to the last sedimentation tower through a pipeline and is arranged on the fourth floor of the four-story platform.

[0004] For example, the patent with application number CN201420050129.9 discloses a device for selectively producing phosphorus pentoxide, in which the phosphorus burning furnace is connected to the cooling tower via a flue gas duct, the cooling tower is connected to the buffer tank, a multi-stage sedimentation bin is arranged behind the buffer tank, and the multi-stage sedimentation bin is connected to the packaging hopper via a collection bin; the phosphorus burning furnace is connected to the polyphosphoric acid absorption tower and the phosphoric acid absorption tower in sequence via the flue gas duct, and the phosphoric acid absorption tower is connected to the fiber demister via an ammonia absorption tower.

[0005] The main function of a cooling tower is to cool down, but there is still a small amount of phosphorus pentoxide adhering to the inner wall of the cooling tower. Under the action of the vibration structure (intermittent action) of the outer wall of the cooling tower and the gravity of the phosphorus pentoxide itself, the phosphorus pentoxide adhering to the inner wall and hardened on the inner wall will fall and deposit at the bottom of the cooling tower, and needs to be discharged regularly. However, customers usually require powdered phosphorus pentoxide (higher activity), and the phosphorus pentoxide at the bottom of the cooling tower usually does not meet the requirements. Summary of the invention

[0006] In order to solve the above problems, the embodiment of the utility model provides a production system of powdered phosphorus pentoxide, which uses a second conveying structure to discharge the phosphorus pentoxide at the bottom of the cooling tower and send it to a rotary vibrating screen, and the rotary vibrating screen separates the granular phosphorus pentoxide into powdered phosphorus pentoxide (the phosphorus pentoxide obtained from the sedimentation tower is all powdered phosphorus pentoxide and is better than the powdered phosphorus pentoxide obtained from the cooling tower). The technical solution is as follows:

[0007] The utility model embodiment provides a production system of powdered phosphorus pentoxide, which includes a phosphorus burning tower 1, a cooling device, a sedimentation device and a first powder storage bin 4 connected in sequence, wherein the cooling device includes a plurality of cooling towers 2 connected in series, the sedimentation device includes a plurality of sedimentation towers 3 connected in series and a first conveying structure 5 for conveying the phosphorus pentoxide outputted from the sedimentation tower 3 to the first powder storage bin 4, the cooling tower 2 and the first powder storage bin 4 are both provided with cooling jackets, and the outer wall of the cooling tower 2 is provided with a vibration structure; the production system also includes a second conveying structure 6, a rotary vibrating screen 7, a second powder storage bin 8 and a granular material storage bin 9, the second conveying structure 6 is used to convey the phosphorus pentoxide outputted from the cooling tower 2 to the feed port of the rotary vibrating screen 7, and the second powder storage bin 8 and the granular material storage bin 9 are both provided with cooling jackets; the rotary vibrating screen 7 is a closed structure, which is located above the second powder storage bin 8 and the granular material storage bin 9, and its fine material outlet and coarse material outlet are respectively connected to the second powder storage bin 8 and the granular material storage bin 9.

[0008] Specifically, the number of cooling towers 2 in the embodiment of the utility model is four, and the four cooling towers 2 are arranged side by side; the lower parts of the first cooling tower 2 and the second cooling tower 2 are connected by a K-shaped connector 10, the upper parts of the second cooling tower 2 and the third cooling tower 2 are connected by a K-shaped connector 10, and the lower parts of the third cooling tower 2 and the fourth cooling tower 2 are connected by a K-shaped connector 10.

[0009] Among them, the second conveying structure 6 in the embodiment of the utility model includes a first screw conveyor 61, a second screw conveyor 62, an intermediate silo 63, a third screw conveyor 64 and a lifting screw conveyor 65; the first screw conveyor 61 is located directly below the first cooling tower 2 and the second cooling tower 2, and the second screw conveyor 62 is located directly below the third cooling tower 2 and the fourth cooling tower 2; a rotating rake structure 66 is provided on the conical bottom of the first cooling tower 2 and the second cooling tower 2, and the discharge ports at the bottom thereof are connected to the upper side of the first screw conveyor 61 through a vertically arranged expansion joint 67; the discharge ports at the bottom of the third cooling tower 2 and the fourth cooling tower 2 are connected to the upper side of the second screw conveyor 62 connection; the discharge ports of the first screw conveyor 61 and the second screw conveyor 62 are both connected to the top of the intermediate silo 63; a rotating rake structure 66 is provided on the conical bottom of the intermediate silo 63, and the discharge port at its bottom is connected to the feed port of the third screw conveyor 64 through a vertically arranged expansion joint 67; the discharge port of the third screw conveyor 64 is connected to the feed port of the lifting screw conveyor 65; the lifting screw conveyor 65 is inclined and is located next to the rotary vibrating screen 7, and its discharge port is connected to the feed port of the rotary vibrating screen 7 through a hose 68; the first screw conveyor 61, the second screw conveyor 62, the intermediate silo 63, the third screw conveyor 64 and the lifting screw conveyor 65 are all provided with cooling jackets.

[0010] Specifically, the four cooling towers 2 in the embodiment of the utility model are arranged side by side front and back, the first screw conveyor 61 and the second screw conveyor 62 are both arranged horizontally in the front-to-back direction, and the intermediate silo 63 is located directly below the first screw conveyor 61 and the second screw conveyor 62.

[0011] Furthermore, a vibration structure is also provided on the outer walls of the settling tower 3, the intermediate material bin 63, the first powder material storage bin 4, the second powder material storage bin 8 and the granular material storage bin 9 in the embodiment of the utility model.

[0012] Specifically, the second powder material storage bin 8 and the granular material storage bin 9 in the embodiment of the utility model are arranged side by side and close together.

[0013] Among them, the mesh aperture of the rotary vibrating screen 7 in the embodiment of the utility model is 2.0-3.5mm.

[0014] The beneficial effects of the technical solution provided by the embodiment of the utility model are:

[0015] (1) The second conveying structure is used to discharge the phosphorus pentoxide at the bottom of the cooling tower and send it to the rotary vibrating screen. The rotary vibrating screen separates the granular phosphorus pentoxide into powdered phosphorus pentoxide. The phosphorus pentoxide obtained from the sedimentation tower is all powdered phosphorus pentoxide and is better than the powdered phosphorus pentoxide obtained from the cooling tower.

[0016] (2) Since the temperature of the phosphorus pentoxide output from the cooling tower is high, the second conveying structure cools the phosphorus pentoxide to facilitate packaging.

[0017] (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, the second cooling tower and the intermediate silo are all 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a principle block diagram of the production system of powdered phosphorus pentoxide in the embodiment of the utility model;

[0019] Figure 2 It is a structural schematic diagram of a production system of powdered phosphorus pentoxide in an embodiment of the utility model;

[0020] Figure 3 is a structural schematic diagram of a cooling tower and a second conveying structure combination;

[0021] Figure 4 It is a structural schematic diagram of the combination of the second conveying structure, the rotary vibrating screen, the second powder material storage bin and the granular material storage bin;

[0022] Figure 5 It is a structural schematic diagram of a combination of a cooling tower, a settling tower, a first conveying structure and a second conveying structure.

[0023] In the figure: 1 phosphorus burning tower, 2 cooling tower, 3 sedimentation tower, 4 first powder storage bin, 5 first conveying structure, 6 second conveying structure, 7 rotary vibrating screen, 8 second powder storage bin, 9 granular storage bin, 10 K-shaped connector;

[0024] 61 first screw conveyor, 62 second screw conveyor, 63 intermediate silo, 64 third screw conveyor, 65 lifting screw conveyor, 66 rotating rake structure, 67 expansion joint, 68 hose. 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 1-5, Example 1 provides a production system for powdered phosphorus pentoxide, which includes a phosphorus burning tower 1, a cooling device, a settling device, a first powder storage bin 4, a second conveying structure 6, a rotary vibrating screen 7, a second powder storage bin 8, a granular storage bin 9 and an exhaust gas treatment device. The phosphorus burning tower 1, the cooling device, the settling device and the first powder storage bin 4 are connected in sequence, and the cooling device includes a plurality of cooling towers 2 connected in series (through a K-shaped connector 10); the settling device includes a plurality of settling towers 3 connected in series (through a K-shaped connector 10) and a first conveying structure 5 that delivers phosphorus pentoxide output from the settling tower 3 to the first powder storage bin 4. The structure of the settling device can refer to the description of application number CN202120468720.6. The last settling tower 3 is connected to the exhaust gas treatment device through a pipeline, and the structure of the exhaust gas treatment device can refer to the description of application number CN202120468714.0. The second conveying structure 6 is used to deliver the phosphorus pentoxide output by the cooling tower 2 to the feed port of the rotary vibrating screen 7. The rotary vibrating screen 7 is a closed structure, which is located above the second powder storage bin 8 and the granular storage bin 9. Its fine material outlet and coarse material outlet are respectively connected to the second powder storage bin 8 and the granular storage bin 9, and is used to separate powdered phosphorus pentoxide and granular phosphorus pentoxide. The mesh aperture of the rotary vibrating screen 7 is 2.0-3.5mm. Cooling jackets are provided outside the cooling tower 2, the first powder storage bin 4, the second powder storage bin 8 and the granular storage bin 9. A vibration structure (pneumatic percussion hammer and pneumatic vibrator, see the description of application number CN202120468538.0) is provided on the outer wall of the cooling tower 2.

[0028] Specifically, see Figure 2-5, the number of cooling towers 2 in the embodiment of the utility model is four, and the four cooling towers 2 are arranged side by side in front and back. The lower parts of the first cooling tower 2 and the second cooling tower 2 are connected by a K-shaped connector 10, the upper parts of the second cooling tower 2 and the third cooling tower 2 are connected by a K-shaped connector 10, and the lower parts of the third cooling tower 2 and the fourth cooling tower 2 are connected by a K-shaped connector 10. The second conveying structure 6 includes a first screw conveyor 61, a second screw conveyor 62, an intermediate silo 63, a third screw conveyor 64 and a lifting screw conveyor 65, etc. The first screw conveyor 61 is located directly below the first cooling tower 2 and the second cooling tower 2, and the second screw conveyor 62 is located directly below the third cooling tower 2 and the fourth cooling tower 2. The first screw conveyor 61 and the second screw conveyor 62 are both arranged horizontally in the front-to-back direction, the intermediate silo 63 is located directly below between the first screw conveyor 61 and the second screw conveyor 62 and its bottom is conical, and the third screw conveyor 64 is arranged horizontally. Since the screw conveyor may guide air, the first screw conveyor 61 is used to collect the discharge of the first cooling tower 2 and the second cooling tower 2 (the lower parts of the two cooling towers 2 are connected) to avoid connecting with other cooling towers 2; the second screw conveyor 62 is used to collect the discharge of the third cooling tower 2 and the fourth cooling tower 2 (the lower parts of the two cooling towers 2 are connected) to avoid connecting with other cooling towers 2. The conical bottom of the first cooling tower 2 and the second cooling tower 2 is provided with a rotating rake structure 66 (the specific structure can be referred to the description of application number CN202120468562.4), and the discharge port at the bottom (high discharge temperature, large discharge volume, and easy agglomeration of discharge) is connected to the upper side of the first screw conveyor 61 through a vertically arranged expansion joint 67. The discharge ports at the bottom of the third cooling tower 2 and the fourth cooling tower 2 (low discharge temperature and very small discharge volume) are connected to the upper side of the second screw conveyor 62. The discharge ports of the first screw conveyor 61 and the second screw conveyor 62 are both connected to the top of the intermediate silo 63. A rotating raking structure 66 is provided on the conical bottom of the intermediate silo 63, and the discharge port at the bottom thereof is connected to the feed port of the third screw conveyor 64 through a vertically arranged expansion joint 67. The discharge port of the third screw conveyor 64 is connected to the feed port (lower end) of the lifting screw conveyor 65. The lifting screw conveyor 65 is arranged obliquely and is located beside the rotary vibrating screen 7, and its discharge port (upper end, located above the rotary vibrating screen 7) is connected to the feed port of the rotary vibrating screen 7 through a hose 68. The first screw conveyor 61, the second screw conveyor 62, the intermediate silo 63, the third screw conveyor 64 and the lifting screw conveyor 65 are all provided with cooling jackets to cool the materials.

[0029] Furthermore, a vibration structure is also provided on the outer walls of the settling tower 3, the intermediate material bin 63, the first powder material storage bin 4, the second powder material storage bin 8 and the granular material storage bin 9 in the embodiment of the utility model.

[0030] Specifically, see Figure 2 and 4 In the embodiment of the utility model, the second powder storage bin 8 and the granular storage bin 9 are arranged side by side and close together. Specifically, the second powder storage bin 8 and the granular storage bin 9 can be formed by dividing a bin through a partition; two conical bottoms are provided at the bottom of the bin and on both sides of the partition to form two bins.

[0031] Example 2

[0032] Example 2 provides a production system for powdered phosphorus pentoxide, the structure of which is basically the same as that of Example 1, except that: the number of sedimentation towers 3 in this embodiment is 9, the 9 sedimentation towers 3 are arranged in an array, and the mesh aperture of the rotary vibrating screen 7 is 2.5 mm.

[0033] Example 3

[0034] Example 3 provides a production system for powdered phosphorus pentoxide, the structure of which is basically the same as that of Example 1, except that the system in this embodiment is arranged on a four-layer platform, which is similar to the structure of the patent with application number CN202120468720.6. The first screw conveyor 61 and the second screw conveyor 62 are arranged on the first layer, and the intermediate silo 63, the third screw conveyor 64, the lifting screw conveyor 65, the second powder storage silo 8 and the granular storage silo 9 are arranged on the bottom layer.

[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 system for producing powdered phosphorus pentoxide, comprising a phosphorus burning tower (1), a cooling device, a settling device and a first powder storage bin (4) connected in sequence, wherein the cooling device comprises a plurality of cooling towers (2) connected in series, the settling device comprises a plurality of settling towers (3) connected in series and a first conveying structure (5) for conveying the phosphorus pentoxide output from the settling towers (3) to the first powder storage bin (4), the cooling towers (2) and the first powder storage bin (4) are both provided with cooling jackets, and a vibration structure is provided on the outer wall of the cooling tower (2); characterized in that: The production system further comprises a second conveying structure (6), a rotary vibrating screen (7), a second powder storage bin (8) and a granular storage bin (9); the second conveying structure (6) is used to convey the phosphorus pentoxide output from the cooling tower (2) to the feed port of the rotary vibrating screen (7); the second powder storage bin (8) and the granular storage bin (9) are both provided with cooling jackets; the rotary vibrating screen (7) is a closed structure, which is located above the second powder storage bin (8) and the granular storage bin (9); and its fine material outlet and coarse material outlet are respectively connected to the second powder storage bin (8) and the granular storage bin (9).

2. The production system of powdered phosphorus pentoxide according to claim 1, characterized in that: The number of the cooling towers (2) is four, and the four cooling towers (2) are arranged side by side; the lower parts of the first cooling tower (2) and the second cooling tower (2) are connected via a K-shaped connector (10), the upper parts of the second cooling tower (2) and the third cooling tower (2) are connected via a K-shaped connector (10), and the lower parts of the third cooling tower (2) and the fourth cooling tower (2) are connected via a K-shaped connector (10).

3. The production system of powdered phosphorus pentoxide according to claim 2, characterized in that: The second conveying structure (6) comprises a first screw conveyor (61), a second screw conveyor (62), an intermediate silo (63), a third screw conveyor (64) and a lifting screw conveyor (65); the first screw conveyor (61) is located directly below the first cooling tower (2) and the second cooling tower (2), and the second screw conveyor (62) is located directly below the third cooling tower (2) and the fourth cooling tower (2); a rotating raking structure (66) is provided on the conical bottom of the first cooling tower (2) and the second cooling tower (2), and the discharge ports at the bottom are connected to the upper side of the first screw conveyor (61) through a vertically arranged expansion joint (67); the discharge ports at the bottom of the third cooling tower (2) and the fourth cooling tower (2) are connected to the upper side of the second screw conveyor (62); The discharge ports of the first screw conveyor (61) and the second screw conveyor (62) are both connected to the top of the intermediate silo (63); a rotating raking structure (66) is provided on the conical bottom of the intermediate silo (63), and the discharge port at the bottom is connected to the feed port of the third screw conveyor (64) through a vertically arranged expansion joint (67); the discharge port of the third screw conveyor (64) is connected to the feed port of the lifting screw conveyor (65); the lifting screw conveyor (65) is inclined and is located next to the rotary vibrating screen (7), and its discharge port is connected to the feed port of the rotary vibrating screen (7) through a hose (68); the first screw conveyor (61), the second screw conveyor (62), the intermediate silo (63), the third screw conveyor (64) and the lifting screw conveyor (65) are all provided with cooling jackets.

4. The production system of powdered phosphorus pentoxide according to claim 3, characterized in that: The four cooling towers (2) are arranged side by side in a front-to-back direction, the first screw conveyor (61) and the second screw conveyor (62) are both arranged horizontally in a front-to-back direction, and the intermediate silo (63) is located directly below the first screw conveyor (61) and the second screw conveyor (62).

5. The production system of powdered phosphorus pentoxide according to claim 3, characterized in that: Vibration structures are also provided on the outer walls of the sedimentation tower (3), the intermediate material bin (63), the first powder material storage bin (4), the second powder material storage bin (8) and the granular material storage bin (9).

6. The production system of powdered phosphorus pentoxide according to claim 1, characterized in that: The second powder material storage bin (8) and the granular material storage bin (9) are arranged side by side and close together.

7. The production system of powdered phosphorus pentoxide according to claim 1, characterized in that: The mesh size of the rotary vibrating screen (7) is 2.0-3.5 mm.

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