Production system of polyphosphoric acid

Abstract

The utility model discloses a polyphosphoric acid production system, which relates to the technical field of phosphoric acid production, and comprises a first reaction tower, a second reaction tower, a first spraying assembly, a heat insulation box and a polyphosphoric acid pool, the first reaction tower is used for receiving flue gas containing P2O5, and the first reaction tower is provided with an outlet pipeline through which polyphosphoric acid flows out; the second reaction tower is used for receiving the flue gas containing P2O5 in the first reaction tower so as to react with an aqueous solution to generate a dilute phosphoric acid solution; the first spraying assembly is arranged in the first reaction tower and is used for receiving the dilute phosphoric acid solution generated by the second reaction tower and spraying the dilute phosphoric acid solution to react with P2O5 in the flue gas to generate polyphosphoric acid; the heat preservation box is arranged on the polyphosphoric acid outlet pipeline so as to preserve heat of the polyphosphoric acid outlet pipeline; and the polyphosphoric acid tank is connected with the polyphosphoric acid outlet through a pipeline. Heat is continuously supplied to the outlet pipeline through the heat preservation box, and polyphosphoric acid flowing through the outlet pipeline can be prevented from being solidified.

Description

Technical Field

[0001] The utility model relates to the technical field of phosphoric acid production, in particular to a production system of polyphosphoric acid. Background Art

[0002] Phosphoric acid is an important basic raw material for chemical products and plays an important role in ensuring the development of the national economy. At present, the production method of polyphosphoric acid is usually to react low-concentration phosphoric acid with phosphorus pentoxide.

[0003] The prior art has the following problems: the polyphosphoric acid generated by the existing polyphosphoric acid production system is easy to solidify and block the pipeline, resulting in low production efficiency. Therefore, it is necessary to improve the existing polyphosphoric acid production system. Summary of the invention

[0004] The embodiment of the utility model provides a polyphosphoric acid production system to solve the technical problem of the existing polyphosphoric acid production system in the related art that the generated polyphosphoric acid is easy to solidify and block the outlet pipeline.

[0005] The present invention provides a polyphosphoric acid production system, comprising:

[0006] A first reaction tower, which is used to receive flue gas containing P2O5, and the first reaction tower is provided with an outlet pipe for the outflow of polyphosphoric acid;

[0007] A second reaction tower, which is used to receive the flue gas containing P2O5 in the first reaction tower to react with the aqueous solution to generate a dilute phosphoric acid solution;

[0008] A first spray assembly is disposed in the first reaction tower, the first spray assembly is used to receive the dilute phosphoric acid solution generated by the second reaction tower, and spray the dilute phosphoric acid solution to react with P2O5 in the flue gas to generate polyphosphoric acid;

[0009] A heat preservation box, which is arranged on the outlet pipe to keep the outlet pipe warm;

[0010] A polyphosphoric acid tank is connected to the outlet pipeline.

[0011] In some embodiments, the polyphosphoric acid production system further comprises:

[0012] A steam generator has a steam outlet connected to the heat preservation box.

[0013] In some embodiments, the polyphosphoric acid production system further comprises:

[0014] A combustion tower is used to burn yellow phosphorus to generate flue gas containing P2O5. The flue gas outlet of the combustion tower is connected to the first reaction tower. The combustion tower is also connected to the steam generator to supply the heat generated by the burning of yellow phosphorus to the steam generator.

[0015] In some embodiments, the first reaction tower is connected to the steam generator, and the first reaction tower is used to supply heat generated by the reaction of the dilute phosphoric acid solution and P2O5 to the steam generator.

[0016] In some embodiments, the polyphosphoric acid production system further comprises:

[0017] The heating device is used to heat the yellow phosphorus solid into liquid and spray it into the combustion tower.

[0018] In some embodiments, the polyphosphoric acid production system further comprises:

[0019] A second spray assembly is disposed in the second reaction tower, and the second spray assembly is used to spray the aqueous solution into the second reaction tower;

[0020] The dilute phosphoric acid tank is used to receive the dilute phosphoric acid solution generated by the second reaction tower and to transport the dilute phosphoric acid solution to the first spray assembly.

[0021] In some embodiments, a first power pump is provided between the dilute phosphoric acid tank and the first spray assembly.

[0022] In some embodiments, the polyphosphoric acid production system further comprises:

[0023] a water tank connected to the second spray assembly;

[0024] The second power pump is arranged between the water tank and the second spray assembly.

[0025] In some embodiments, regulating valves are provided on the inlet pipes of the first spray assembly and the second spray assembly.

[0026] In some embodiments, a temperature monitoring component is provided on the outlet pipe.

[0027] The beneficial effects brought by the technical solution provided by the utility model include:

[0028] The embodiment of the utility model provides a polyphosphoric acid production system, in which an insulation box is arranged on the outlet pipe of the polyphosphoric acid of the first reaction tower. The insulation box continuously provides heat to the outlet pipe, thereby preventing the polyphosphoric acid flowing through the outlet pipe from solidifying, improving the flow efficiency of the polyphosphoric acid, and thus ensuring the efficiency of the polyphosphoric acid production. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0030] Figure 1 A schematic diagram of a polyphosphoric acid production system provided in an embodiment of the utility model;

[0031] In the figure: 1. first reaction tower; 2. first spray assembly; 3. insulation box; 4. steam generator; 5. combustion tower; 6. heating device; 7. second reaction tower; 8. second spray assembly; 9. dilute phosphoric acid tank; 10. first power pump; 11. water tank; 12. second power pump; 13. polyphosphoric acid tank; 14. regulating valve; 15. temperature monitoring assembly. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0033] The embodiment of the utility model provides a polyphosphoric acid production system, which can solve the technical problem of the existing polyphosphoric acid production system that the generated polyphosphoric acid is easy to solidify and block the outlet pipeline.

[0034] See also Figure 1 As shown, a polyphosphoric acid production system includes: a first reaction tower 1, a second reaction tower 7, a first spray assembly 2, an insulation box 3 and a polyphosphoric acid tank 13.

[0035] The first reaction tower 1 is used to receive flue gas containing P2O5, and the first reaction tower 1 is provided with an outlet pipe for the outflow of polyphosphoric acid. The second reaction tower 7 is used to receive the flue gas containing P2O5 in the first reaction tower 1 to react with the aqueous solution to generate a dilute phosphoric acid solution. The first spray assembly 2 is arranged in the first reaction tower 1, and the first spray assembly 2 is used to receive the dilute phosphoric acid solution generated by the second reaction tower 7, and spray the dilute phosphoric acid solution to react with P2O5 in the flue gas to generate polyphosphoric acid. The heat preservation box 3 is arranged on the outlet pipe to keep the outlet pipe warm. The polyphosphoric acid tank 13 is connected to the polyphosphoric acid outlet pipe.

[0036] The polyphosphoric acid production system in the embodiment of the utility model is provided with an insulation box 3 on the outlet pipe of the polyphosphoric acid of the first reaction tower 1. The insulation box 3 continuously provides heat to the outlet pipe, thereby preventing the polyphosphoric acid flowing through the outlet pipe from solidifying, improving the flow efficiency of the polyphosphoric acid, and thus ensuring the efficiency of the polyphosphoric acid production.

[0037] As an alternative embodiment, see Figure 1 As shown, the polyphosphoric acid production system also includes: a steam generator 4, the steam outlet of the steam generator 4 is connected to the insulation box 3, and the steam generator 4 supplies the generated steam to the insulation box 3, so that the insulation box 3 is kept at a certain high temperature, thereby keeping the outlet pipeline of the first reaction tower 1 at a certain high temperature, so that the polyphosphoric acid flows smoothly.

[0038] As an alternative embodiment, see Figure 1 As shown, the polyphosphoric acid production system also includes: a combustion tower 5, which is used to burn yellow phosphorus to generate flue gas containing P2O5. The flue gas outlet of the combustion tower 5 is connected to the first reaction tower 1. The combustion tower 5 is also connected to the steam generator 4 to supply the heat generated by the combustion of yellow phosphorus to the steam generator 4, so as to avoid wasting the heat energy generated by the combustion and improve the utilization rate of heat energy in production.

[0039] As an alternative embodiment, see Figure 1 As shown, the first reaction tower 1 is connected to the steam generator 4. The first reaction tower 1 is used to supply the heat generated by the reaction of the dilute phosphoric acid solution and P2O5 to the steam generator 4, so as to avoid wasting the heat energy generated by the chemical reaction and further improve the utilization rate of heat energy in production.

[0040] As an alternative embodiment, see Figure 1 As shown, the polyphosphoric acid production system also includes: a heating device 6, which is used to heat the yellow phosphorus solid into a liquid state and spray it into the combustion tower 5. The yellow phosphorus solid is heated into a liquid state and then burned, which can make the yellow phosphorus burn more completely.

[0041] As an alternative embodiment, see Figure 1 As shown, the polyphosphoric acid production system further includes: a second spray assembly 8 and a dilute phosphoric acid tank 9, wherein the second spray assembly 8 is disposed in the second reaction tower 7, and the second spray assembly 8 is used to spray the aqueous solution into the second reaction tower 7. The dilute phosphoric acid tank 9 is used to receive the dilute phosphoric acid solution generated by the second reaction tower 7, and to transport the dilute phosphoric acid solution to the first spray assembly 2.

[0042] As an alternative embodiment, see Figure 1As shown, a first power pump 10 is provided between the dilute phosphoric acid tank 9 and the first spray assembly 2 , and the first power pump 10 provides power for the first spray assembly 2 to spray the dilute phosphoric acid solution.

[0043] As an alternative embodiment, see Figure 1 As shown, the polyphosphoric acid production system also includes: a water tank 11 and a second power pump 12, the water tank 11 is connected to the second spray assembly 8, the second power pump 12 is arranged between the water tank 11 and the second spray assembly 8, and the second power pump 12 provides power for the second spray assembly 8 to spray the aqueous solution.

[0044] As an alternative embodiment, see Figure 1 As shown, the inlet pipes of the first spray assembly 2 and the second spray assembly 8 are both provided with regulating valves 14 to facilitate regulating the flow of the fluid medium.

[0045] As an alternative embodiment, see Figure 1 As shown, a temperature monitoring component 15 is provided on the outlet pipe, and the temperature monitoring component 15 is convenient for the staff to monitor the temperature of the outlet pipe in real time and understand the insulation situation.

[0046] In the description of the present utility model, it should be noted that the terms "upper", "lower", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present utility model. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances.

[0047] It should be noted that, in the present utility model, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0048] The above description is only a specific embodiment of the present invention, so that those skilled in the art can understand or implement the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features of the present invention.

Claims

1. A polyphosphoric acid production system, characterized in that: include: A first reaction tower (1) for receiving flue gas containing P2O5, wherein the first reaction tower (1) is provided with an outlet pipe for the outflow of polyphosphoric acid; a second reaction tower (7) for receiving the flue gas containing P2O5 from the first reaction tower (1) to react with the aqueous solution to generate a dilute phosphoric acid solution; a first spray assembly (2) disposed in the first reaction tower (1), the first spray assembly (2) being used to receive the dilute phosphoric acid solution generated by the second reaction tower (7) and spray the dilute phosphoric acid solution to react with P2O5 in the flue gas to generate polyphosphoric acid; A heat preservation box (3) is arranged on the outlet pipe to keep the outlet pipe warm; A polyphosphoric acid tank (13) is connected to the outlet pipe.

2. A polyphosphoric acid production system as claimed in claim 1, characterized in that: Also includes: A steam generator (4) has a steam outlet connected to the heat preservation box (3).

3. A polyphosphoric acid production system as claimed in claim 2, characterized in that: Also includes: A combustion tower (5) is used for burning yellow phosphorus to generate flue gas containing P2O5, the flue gas outlet of the combustion tower (5) is connected to the first reaction tower (1), and the combustion tower (5) is also connected to the steam generator (4) to supply heat generated by the burning of yellow phosphorus to the steam generator (4).

4. A polyphosphoric acid production system as claimed in claim 3, characterized in that: The first reaction tower (1) is connected to the steam generator (4), and the first reaction tower (1) is used to supply heat generated by the reaction of the dilute phosphoric acid solution and P2O5 to the steam generator (4).

5. A polyphosphoric acid production system as claimed in claim 3, characterized in that: Also includes: A heating device (6) is used to heat the yellow phosphorus solid into a liquid state and spray the liquid into the combustion tower (5).

6. A polyphosphoric acid production system as claimed in claim 1, characterized in that: Also includes: a second spraying assembly (8), which is disposed in the second reaction tower (7), and the second spraying assembly (8) is used to spray the aqueous solution into the second reaction tower (7); The dilute phosphoric acid tank (9) is used to receive the dilute phosphoric acid solution generated by the second reaction tower (7) and to transport the dilute phosphoric acid solution to the first spray assembly (2).

7. A polyphosphoric acid production system as claimed in claim 6, characterized in that: A first power pump (10) is provided between the dilute phosphoric acid tank (9) and the first spray assembly (2).

8. A polyphosphoric acid production system as claimed in claim 6, characterized in that: Also includes: A water tank (11), connected to the second spray assembly (8); A second power pump (12) is arranged between the water tank (11) and the second spray assembly (8).

9. A polyphosphoric acid production system as claimed in claim 6, characterized in that: The inlet pipes of the first spray assembly (2) and the second spray assembly (8) are both provided with regulating valves (14).

10. A polyphosphoric acid production system as claimed in claim 1, characterized in that: The outlet pipe is provided with a temperature monitoring component (15).

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