Device unit and system capable of providing phosphoric acid with different concentrations for production line

Abstract

The utility model discloses a device unit and a system capable of providing phosphoric acid with different concentrations for a production line, which belong to the field of chemical engineering, and comprise a phosphoric acid storage tank with an interlayer at the middle lower part, the top of the phosphoric acid storage tank is connected with an acid supply pipe, the top is connected with a discharge pipe, and the middle is connected with an acid adjusting pipe; the device unit comprises an upper connecting pipe, a lower connecting pipe, a steam inlet pipe, a chilled water return pipe, a steam condensate pipe, a chilled water inlet pipe, a first three-way electromagnetic valve and a second three-way electromagnetic valve, and the other end of the upper connecting pipe is communicated with the steam inlet pipe and the chilled water return pipe through the first three-way electromagnetic valve. The other end of the lower connecting pipe is communicated with a steam condensate pipe and a freezing water inlet pipe through a second three-way electromagnetic valve. The device can provide phosphoric acid with different concentrations for a production line.

Description

Technical Field

[0001] This utility model relates to chemical production, and in particular to a device unit and system that can supply phosphoric acid of different concentrations to a production line. Background Technology

[0002] Within chemical production enterprises, some production lines require lower concentrations of phosphoric acid, while others require higher concentrations of sulfuric acid. Existing chemical production enterprises typically employ the following methods:

[0003] (1) Purchase multiple types of phosphoric acid, i.e., purchase phosphoric acid of the concentration required by each production line;

[0004] (2) Purchase the highest concentration phosphoric acid and dilute it with water before use;

[0005] (3) Purchase the lowest concentration of phosphoric acid, and then use a heated concentration tank to evaporate the water to the required concentration.

[0006] The above methods (1) and (2) have high purchase costs. Although method (3) has lower purchase costs, its high energy consumption leads to higher production costs. Method (3) is not suitable because phosphoric acid corrodes equipment severely at high temperatures. Furthermore, the above methods (1) to (3) are not conducive to automated production because the production lines operate independently. Utility Model Content

[0007] To address the aforementioned deficiencies, this invention provides a device unit capable of supplying phosphoric acid of different concentrations to a production line, aiming to improve at least one of the problems mentioned in the background art.

[0008] A device unit capable of supplying phosphoric acid of different concentrations to a production line includes a phosphoric acid storage tank with a jacket in the middle and lower part. The top of the phosphoric acid storage tank is connected to an acid supply pipe, the top is connected to a discharge pipe, the middle is connected to an acid adjustment pipe, the upper part of the jacket is connected to an upper connecting pipe, and the bottom is connected to a lower connecting pipe. The device unit also includes a steam inlet pipe, a chilled water return pipe, a steam condensate pipe, a chilled water inlet pipe, a first three-way solenoid valve, and a second three-way solenoid valve. The other end of the upper connecting pipe is connected to the steam inlet pipe and the chilled water return pipe through the first three-way solenoid valve, and the other end of the lower connecting pipe is connected to the steam condensate pipe and the chilled water inlet pipe through the second three-way solenoid valve.

[0009] In one or more alternative embodiments of this utility model, a breather valve is also connected to the top of the phosphoric acid storage tank.

[0010] In one or more optional embodiments of the present invention, the phosphoric acid storage tank is further equipped with a motor and a stirring device connected to the motor. The motor is installed on the top of the phosphoric acid storage tank, and the stirring device includes a stirring shaft and stirring blades. The lower end of the stirring shaft passes downward through the top wall of the phosphoric acid storage tank and is located at the bottom of the inside of the phosphoric acid storage tank. The stirring blades are located inside the phosphoric acid storage tank and are horizontally installed on the stirring shaft.

[0011] In one or more optional embodiments of this utility model, a coil is provided inside the interlayer, with the upper end of the coil connected to the upper connecting pipe and the lower end connected to the lower connecting pipe.

[0012] In one or more optional embodiments of this utility model, an acid supply solenoid valve is installed on the acid supply pipe, a discharge solenoid valve is installed on the discharge pipe, and an acid adjustment solenoid valve is installed on the acid adjustment pipe.

[0013] In one or more optional embodiments of the present invention, the device unit further includes a high liquid level sensor, a medium liquid level sensor and a low liquid level sensor. The high liquid level sensor is installed in the upper part of the phosphoric acid storage tank, the medium liquid level sensor is installed in the middle part of the phosphoric acid storage tank, and the low liquid level sensor is installed in the bottom of the phosphoric acid storage tank.

[0014] In one or more optional embodiments of the present invention, the device unit further includes a low-density sensor and a high-density sensor, wherein the low-density sensor is installed between the high-level sensor and the medium-level sensor, and the high-density sensor is installed between the medium-level sensor and the low-level sensor.

[0015] This invention also provides a system for supplying phosphoric acid of different concentrations to a production line.

[0016] A system for supplying phosphoric acid of different concentrations to a production line includes at least two of the aforementioned device units. The system also includes an acid inlet manifold, a steam manifold, a discharge manifold, a fully automatic centrifuge unit, a chilled water manifold, a water inlet manifold, a condensate manifold, and an acid adjusting manifold connected to an acid unloading system. The acid adjusting manifold is connected to the process line used in the workshop. The other end of the acid supply pipe of each device unit is connected in parallel to the acid inlet manifold. The other end of the steam inlet pipe of each device unit is connected in parallel to the steam manifold. The other end of the discharge pipe of each device unit is connected in parallel to the discharge manifold, which is connected to the fully automatic centrifuge unit. The other end of the chilled water return pipe of each device unit is connected in parallel to the chilled water manifold. The other end of the chilled water inlet pipe of each device unit is connected in parallel to the water inlet manifold. The other end of the steam condensate pipe of each device unit is connected in parallel to the condensate manifold. The other end of the acid adjusting pipe of each device unit is connected in parallel to the acid adjusting manifold.

[0017] Beneficial effects of the invention:

[0018] This invention utilizes the natural sedimentation process of phosphoric acid to separate it into low-density and high-density phosphoric acid regions. The phosphoric acid solution from the low-density region is then sent to the workshop for use via an acid adjustment pipe. When the phosphoric acid concentration in the high-density region is high, a mixture of phosphoric acid and phosphoric acid crystals is formed by cooling and crystallizing with cooling water. This mixture is then sent to a fully automatic centrifuge for centrifugation and dehydration to obtain phosphoric acid crystals, resulting in high-concentration phosphoric acid (up to 98%). This high-concentration phosphoric acid is then sent to places where it is needed (such as production lines for fertilizer-grade ammonium polyphosphate). This invention utilizes the crystallization of phosphoric acid at different concentrations to achieve high-concentration phosphoric acid with low energy consumption. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] In the diagram: 1. Phosphoric acid storage tank; 2. Jacket; 3. Acid supply pipe; 4. Acid supply solenoid valve; 5. Breather valve; 6. Motor; 7. Agitator shaft; 8. Agitator blades; 10. Discharge pipe; 11. Discharge solenoid valve; 12. Acid adjustment pipe; 13. Acid adjustment solenoid valve; 14. Upper connecting pipe; 15. Lower connecting pipe; 16. Steam inlet pipe; 17. Chilled water return pipe; 18. Steam condensate pipe; 19. Chilled water inlet pipe; 20. First three-way solenoid valve; 21. 21. Second and third-way solenoid valves; 22. Coil; 23. High liquid level sensor; 24. Medium liquid level sensor; 25. Low liquid level sensor; 26. Low density sensor; 27. High density sensor; 28. Low-density phosphoric acid zone; 29. ​​High-density phosphoric acid zone; 30. Acid inlet main pipe; 31. Steam main pipe; 32. Discharge main pipe; 33. Chilled water main pipe; 34. Water inlet main pipe; 35. Condensate main pipe; 36. Acid adjustment main pipe; 37. Acid adjustment pump. Detailed Implementation

[0021] The present invention will be further described below.

[0022] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "longitudinal," "lateral," "horizontal," "inner," "outer," "front," "rear," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0023] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "have," "install," "connect," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] Example 1

[0025] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0026] A device unit capable of supplying phosphoric acid of different concentrations to a production line includes a phosphoric acid storage tank 1 with a jacket 2 in the middle and lower part. The top of the phosphoric acid storage tank 1 is connected to an acid supply pipe 3 and a discharge pipe 10. The middle part is connected to an acid adjustment pipe 12. The upper part of the jacket 2 is connected to an upper connecting pipe 14 and the bottom is connected to a lower connecting pipe 15. The device unit also includes a steam inlet pipe 16, a chilled water return pipe 17, a steam condensate pipe 18, a chilled water inlet pipe 19, a first three-way solenoid valve 20, and a second three-way solenoid valve 21. The other end of the upper connecting pipe 14 is connected to the steam inlet pipe 16 and the chilled water return pipe 17 through the first three-way solenoid valve 20. The other end of the lower connecting pipe 15 is connected to the steam condensate pipe 18 and the chilled water inlet pipe 19 through the second three-way solenoid valve 21.

[0027] In one or more specific embodiments of this utility model, a breather valve 5 is also connected to the top of the phosphoric acid storage tank 1. The breather valve 5 is used for automatic venting to discharge the gas inside the tank.

[0028] In one or more specific embodiments of this utility model, the phosphoric acid storage tank 1 is further equipped with a motor 6 and a stirring device connected to the motor 6. The motor 6 is installed on the top of the phosphoric acid storage tank 1. The stirring device includes a stirring shaft 7 and stirring blades 8. The lower end of the stirring shaft 7 passes downward through the top wall of the phosphoric acid storage tank 1 and is located at the bottom of the inside of the phosphoric acid storage tank 1. The stirring blades 8 are located inside the phosphoric acid storage tank 1 and are horizontally installed on the stirring shaft 7.

[0029] In one or more specific embodiments of this utility model, a coil 22 is provided in the interlayer 2. The upper end of the coil 22 is connected to the upper connecting pipe 14, and the lower end is connected to the lower connecting pipe 15, so as to better utilize thermal efficiency.

[0030] In one or more specific embodiments of this utility model, for ease of control and automation, an acid supply solenoid valve 4 is installed on the acid supply pipe 3, a discharge solenoid valve 11 is installed on the discharge pipe 10, and an acid adjustment solenoid valve 13 is installed on the acid adjustment pipe 12.

[0031] In one or more specific embodiments of this utility model, in order to further facilitate control and automation, the device unit further includes a high liquid level sensor 23, a medium liquid level sensor 24 and a low liquid level sensor 25. The high liquid level sensor 23 is installed in the upper part of the phosphoric acid storage tank 1, the medium liquid level sensor 24 is installed in the middle part of the phosphoric acid storage tank 1, and the low liquid level sensor 25 is installed in the bottom of the phosphoric acid storage tank 1.

[0032] In one or more specific embodiments of this utility model, to further facilitate control and automation, the device unit also includes a low-density sensor 26 and a high-density sensor 27. The low-density sensor 26 is installed between the high-level sensor 23 and the medium-level sensor 24, and the high-density sensor 27 is installed between the medium-level sensor 24 and the low-level sensor 25. After phosphoric acid is placed in the phosphoric acid storage tank 1, it will naturally settle and separate into two layers over time: an upper layer of low-density phosphoric acid region 28 and a lower layer of high-density phosphoric acid region 29. The low-density sensor 26 is used to monitor the phosphoric acid density in the low-density phosphoric acid region 28, and the high-density sensor 27 is used to monitor the phosphoric acid density in the high-density phosphoric acid region 29.

[0033] Example 2

[0034] Please refer to this again. Figure 1 A system for supplying phosphoric acid of different concentrations to a production line is disclosed. The system comprises at least two of the device units described in Embodiment 1. The system also includes an acid inlet main pipe 30, a steam main pipe 31, a discharge main pipe 32, a fully automatic centrifuge unit (not shown in the figure), a chilled water main pipe 33, a water inlet main pipe 34, a condensate main pipe 35, and an acid conditioning main pipe 36, all connected to an acid unloading system. The acid conditioning main pipe 36 is connected to the process line used in the workshop. The other end of the acid supply pipe 3 of each device unit is connected in parallel to the acid inlet main pipe 30. The steam supply pipe of each device unit... The other end of the inlet pipe 16 is connected in parallel to the steam main pipe 31. The other end of the discharge pipe 10 of each unit is connected in parallel to the discharge main pipe 32, which is connected to the fully automatic centrifuge unit. The other end of the chilled water return pipe 17 of each unit is connected in parallel to the chilled water main pipe 33. The other end of the chilled water inlet pipe 19 of each unit is connected in parallel to the inlet main pipe 34. The other end of the steam condensate pipe 18 of each unit is connected in parallel to the condensate main pipe 35. The other end of the acid adjusting pipe 12 of each unit is connected in parallel to the acid adjusting main pipe 36. An acid adjusting pump 37 is installed on the acid adjusting main pipe 36.

[0035] In this invention, when the phosphoric acid level in the phosphoric acid storage tank 1 reaches the high level, acid feeding is stopped (the high level sensor 23 is automatically interlocked with the acid supply solenoid valve 4, and the acid supply solenoid valve 4 automatically closes when the high level is reached); when the phosphoric acid level in the phosphoric acid storage tank 1 is low, it is interlocked with the centrifuge solenoid valve (not shown in the figure) and automatically closed, at which time phosphoric acid can be added; when the level reaches the medium level, the acid adjustment solenoid valve 13 automatically closes and is interlocked with the acid adjustment pump 37.

[0036] This invention utilizes the natural settling of phosphoric acid in phosphoric acid storage tank 1 (natural settling time is approximately 2 months). At this time, the upper part is a clear phosphoric acid solution, and the lower part has a phosphoric acid concentration of approximately 86%-90%. The phosphoric acid density can be observed and detected by two density sensors. When the upper phosphoric acid density drops to 82%, the workshop begins to use the upper clear phosphoric acid solution, and no new phosphoric acid is added during the workshop's use. Several phosphoric acid storage tanks 1 are used in rotation. When the phosphoric acid solution reaches the middle level, the phosphoric acid discharge solenoid valve 11 automatically closes, and no more material is discharged. The high-density sensor 27 observes and detects the phosphoric acid concentration. When the phosphoric acid concentration is ≥86%, the density sensor can control the three-way solenoid valve (not shown in the figure) to open the water supply solenoid valve (not shown in the figure), switch to chilled water supply, and simultaneously switch to cooling water return state, returning to the chiller unit collection tank. When the low liquid level is reached, it switches to steam to dissolve the crystals on the four walls of the tank and the power equipment, and switches to steam condensate drainage state, while cutting off the chilled water inlet. The steam condensate is discharged to the condensate main pipe 35 through the steam trap and then enters the condensate collection tank.

[0037] In this invention, cooling water (temperature 1℃-10℃) enters the jacket 2 through the second three-way solenoid valve 21 to cool and crystallize the phosphoric acid in the lower part of the storage tank. The chiller is started simultaneously with the stirring. After the phosphoric acid crystallization is complete, the bottom discharge solenoid valve 11 is manually activated to discharge the phosphoric acid and the crystalline mixture through the discharge manifold 32 into a fully automatic centrifuge. The phosphoric acid crystals obtained after dehydration in the centrifuge are placed in a high-concentration phosphoric acid storage tank to obtain high-concentration phosphoric acid, which is then used in the production of equipment requiring high-concentration phosphoric acid.

[0038] If phosphoric acid crystals cause blockage in the phosphoric acid storage tank 1 or the pipeline to the centrifuge, the first three-way solenoid valve 20 can be switched to the steam system to heat the phosphoric acid storage tank 1 and the pipeline to prevent blockage.

[0039] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A device unit capable of supplying phosphoric acid of different concentrations to a production line, comprising a phosphoric acid storage tank (1) with a jacket (2) in the middle and lower part, characterized in that, The top of the phosphoric acid storage tank (1) is connected to an acid supply pipe (3), the top is connected to a discharge pipe (10), the middle is connected to an acid adjustment pipe (12), the upper part of the jacket (2) is connected to an upper connecting pipe (14), and the bottom is connected to a lower connecting pipe (15). The device unit also includes a steam inlet pipe (16), a chilled water return pipe (17), a steam condensate pipe (18), a chilled water inlet pipe (19), a first three-way solenoid valve (20), and a second three-way solenoid valve (21). The other end of the upper connecting pipe (14) is connected to the steam inlet pipe (16) and the chilled water return pipe (17) through the first three-way solenoid valve (20), and the other end of the lower connecting pipe (15) is connected to the steam condensate pipe (18) and the chilled water inlet pipe (19) through the second three-way solenoid valve (21).

2. The device unit capable of supplying phosphoric acid of different concentrations to the production line according to claim 1, characterized in that, The top of the phosphoric acid storage tank (1) is also connected to a breather valve (5).

3. The device unit for supplying phosphoric acid of different concentrations to the production line according to claim 1, characterized in that, The phosphoric acid storage tank (1) is also equipped with a motor (6) and a stirring device connected to the motor (6). The motor (6) is installed on the top of the phosphoric acid storage tank (1). The stirring device includes a stirring shaft (7) and stirring blades (8). The lower end of the stirring shaft (7) passes downward through the top wall of the phosphoric acid storage tank (1) and is located at the bottom of the inside of the phosphoric acid storage tank (1). The stirring blades (8) are located inside the phosphoric acid storage tank (1) and are horizontally installed on the stirring shaft (7).

4. The device unit for supplying phosphoric acid of different concentrations to the production line according to claim 1, characterized in that, The interlayer (2) is provided with a coil (22), the upper end of which is connected to the upper connecting pipe (14), and the lower end is connected to the lower connecting pipe (15).

5. The device unit for supplying phosphoric acid of different concentrations to the production line according to claim 1, characterized in that, An acid supply solenoid valve (4) is installed on the acid supply pipe (3), a discharge solenoid valve (11) is installed on the discharge pipe (10), and an acid adjustment solenoid valve (13) is installed on the acid adjustment pipe (12).

6. The device unit for supplying phosphoric acid of different concentrations to the production line according to claim 5, characterized in that, The device unit also includes a high liquid level sensor (23), a medium liquid level sensor (24), and a low liquid level sensor (25). The high liquid level sensor (23) is installed in the upper part of the phosphoric acid storage tank (1), the medium liquid level sensor (24) is installed in the middle part of the phosphoric acid storage tank (1), and the low liquid level sensor (25) is installed in the bottom of the phosphoric acid storage tank (1).

7. The device unit for supplying phosphoric acid of different concentrations to a production line according to claim 6, characterized in that, The device unit also includes a low-density sensor (26) and a high-density sensor (27). The low-density sensor (26) is installed between the high liquid level sensor (23) and the medium liquid level sensor (24), and the high-density sensor (27) is installed between the medium liquid level sensor (24) and the low liquid level sensor (25).

8. A system capable of supplying phosphoric acid of different concentrations to a production line, characterized in that, The system includes at least two of the device units described in any one of claims 1-7, and further includes an acid inlet main pipe (30), a steam main pipe (31), a discharge main pipe (32), a fully automatic centrifuge unit, a chilled water main pipe (33), a water inlet main pipe (34), a condensate main pipe (35), and an acid conditioning main pipe (36) connected to the acid unloading system. The acid conditioning main pipe (36) is connected to the process line used in the workshop. The other end of the acid supply pipe (3) of each device unit is connected in parallel to the acid inlet main pipe (30), and the other end of the steam inlet pipe (16) of each device unit is connected in parallel to the steam inlet main pipe (30). On the steam main pipe (31), the other end of the discharge pipe (10) of each unit is connected in parallel to the discharge main pipe (32), the discharge main pipe (32) is connected to the fully automatic centrifuge unit, the other end of the chilled water return pipe (17) of each unit is connected in parallel to the chilled water main pipe (33), the other end of the chilled water inlet pipe (19) of each unit is connected in parallel to the water inlet main pipe (34), the other end of the steam condensate pipe (18) of each unit is connected in parallel to the condensate main pipe (35), and the other end of the acid adjusting pipe (12) of each unit is connected in parallel to the acid adjusting main pipe (36).

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