Mechanical seal water system for phosphate production

Abstract

The utility model discloses a mechanical seal water system for phosphate production. The mechanical seal water system comprises a first pump mechanical seal water circulation system, a vacuum pump mechanical seal water circulation system and a first switch, the first switch is arranged between the first pump mechanical seal water circulation system and the vacuum pump mechanical seal water circulation system; wherein the first pump mechanical seal water circulation system comprises a first pump mechanical seal water unit and an alkaline liquid storage tank; the first pump mechanical seal water unit is communicated with the alkaline liquid storage tank; a first pump mechanical seal water circulation system and a vacuum pump mechanical seal water circulation system are separately arranged; the mechanical seal in a phosphate production system is prevented from being corroded by acidic mechanical seal water, and the situation of mechanical seal leakage in the phosphate production process is reduced, so that the service life of the mechanical seal is prolonged, the maintenance cost of phosphate manufacturing equipment is reduced, and the equipment maintenance time is shortened.

Description

Technical Field

[0001] The utility model relates to the technical field of phosphate production, in particular to a machine sealing water system for phosphate production. Background Art

[0002] In the system of producing phosphate using wet phosphoric acid, nitric acid is needed;

[0003] In the existing phosphate production machine seal water system, the machine seal water of all pumps is circulated and connected. Among them, the vacuum pump generates NO absorption when working. X (nitrogen oxides), which causes the pH value of the vacuum pump seal water to gradually decrease from neutral and eventually turn into an acidic state. In addition, this acidic seal water may also contain trace amounts of F (fluorine), which will corrode the seal in the seal water system, causing the seal to be less tight, and eventually leading to frequent seal leakage; this leakage not only affects the normal operation of the pump, but also may pollute the environment, while also increasing maintenance costs and downtime. Utility Model Content

[0004] In order to overcome the deficiencies of the prior art, the utility model provides a mechanical seal water system for phosphate production, which can increase the service life of the mechanical seal, reduce maintenance costs and shorten maintenance time.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] A machine sealing water system for phosphate production, comprising: a first pump machine sealing water circulation system, a vacuum pump machine sealing water circulation system and a first switch;

[0007] The first switch is arranged between the first pump sealing water circulation system and the vacuum pump sealing water circulation system;

[0008] Wherein, the first pump water sealing circulation system includes a first pump water sealing unit and an alkaline liquid storage tank; the first pump water sealing unit is connected to the alkaline liquid storage tank.

[0009] The machine sealing water system for phosphate production as described above, wherein the vacuum pump machine sealing water circulation system comprises a vacuum pump machine sealing water unit and a liquid storage tank;

[0010] The liquid storage tank is in communication with the vacuum pump water sealing unit;

[0011] The liquid storage tank is used to replenish liquid into the vacuum pump water sealing unit.

[0012] The machine sealing water system for phosphate production as described above, the vacuum pump machine sealing water circulation system further includes a first pipeline and a second pipeline;

[0013] The first pipeline and the second pipeline are both connected to the vacuum pump water sealing unit and the liquid storage tank;

[0014] The first pipeline is used to transport the liquid in the liquid storage tank to the vacuum pump water sealing unit;

[0015] The second pipeline is used to transport the liquid in the vacuum pump water sealing unit to the liquid storage tank.

[0016] As described above, in the machine sealing water system for phosphate production, the vacuum pump machine sealing water circulation system further comprises a liquid replenishing tank connected to the liquid storage tank, and the liquid replenishing tank is used to supply desalted water to the liquid storage tank.

[0017] As described above, in the machine sealing water system for phosphate production, the vacuum pump machine sealing water circulation system further comprises a first water pump arranged on the first pipeline.

[0018] As described above, in the machine sealing water system for phosphate production, the first pump machine sealing water circulation system also includes an alkaline liquid replenishing tank connected to the alkaline liquid storage tank, and the alkaline liquid replenishing tank can supply secondary steam condensate generated by the concentration of diammonium phosphate to the alkaline liquid storage tank.

[0019] The pump water sealing system for phosphate production as described above, wherein the first pump water sealing circulation system further comprises a third pipeline, a fourth pipeline, a third switch and a fourth switch;

[0020] The third pipeline and the fourth pipeline are connected to the first pump water sealing unit and the alkaline liquid storage tank;

[0021] The third pipeline is used to transmit the liquid in the alkaline liquid storage tank to the first pump water sealing unit;

[0022] The fourth pipeline is used to transmit the liquid in the first pump water sealing unit to the alkaline liquid storage tank;

[0023] The third switch is arranged on the third pipe;

[0024] The fourth switch is arranged on the fourth pipeline.

[0025] As described above, in the machine sealing water system for phosphate production, the first pump machine sealing water circulation system further includes a second water pump arranged on the third pipeline, and the second water pump is arranged between the third switch and the alkaline liquid storage tank.

[0026] In the mechanical sealing water system for phosphate production as described above, the suction port of the second water pump is 80 mm to 100 mm away from the bottom of the alkaline liquid storage tank.

[0027] The machine sealing water system for phosphate production as described above also includes a main pipe connected to the first pump machine sealing water circulation system and the vacuum pump machine sealing water circulation system.

[0028] The beneficial effects of the utility model are:

[0029] The first pump sealing water circulation system and the vacuum pump sealing water circulation system are set separately; the alkaline liquid storage tank supplies alkaline liquid, and creating an alkaline environment can slow down the corrosion rate of the metal surface of the machine seal and extend the service life of the equipment; the vacuum pump absorbs NO during operation X When the pH value of the vacuum pump sealing water circulation system decreases and becomes acidic, turning on the first switch can allow the alkaline liquid in the first pump sealing water circulation system to flow into the vacuum pump sealing water circulation system and neutralize with the acidic sealing water in the vacuum pump sealing water circulation system; thus preventing the acidic sealing water from corroding the seal in the phosphate production system and reducing the occurrence of seal leakage in the phosphate production process, thereby increasing the service life of the seal, reducing the maintenance cost of phosphate manufacturing equipment and reducing equipment maintenance time. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0031] Figure 1 It is a structural schematic diagram of a machine sealing water system for phosphate production described in the present application;

[0032] Among them: 1-first pump water sealing circulation system; 11-first pump water sealing unit; 12-alkaline liquid storage tank; 13-third pipeline; 14-fourth pipeline; 15-third switch; 16-fourth switch; 17-alkaline liquid replenishment tank; 18-second water pump; 2-vacuum pump water sealing circulation system; 21-vacuum pump water sealing unit; 22-liquid storage tank; 23-first pipeline; 24-second pipeline; 25-first water pump; 26-replenishment tank; 3-first switch. DETAILED DESCRIPTION

[0033] The following will clearly and completely describe the concept, specific structure and technical effects of the utility model in combination with the embodiments and drawings, so as to fully understand the purpose, characteristics and effects of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, other embodiments obtained by technicians in this field without creative work are all within the scope of protection of the utility model. In addition, all the connection / connection relationships involved in the patent do not refer to the direct connection of components, but refer to the fact that a better connection structure can be formed by adding or reducing connecting accessories according to the specific implementation situation. The various technical features in the creation of the utility model can be combined interchangeably without conflicting with each other.

[0034] Reference Figure 1 , a machine sealing water system for phosphate production, comprising: a first pump machine sealing water circulation system 1, a vacuum pump machine sealing water circulation system 2 and a first switch 3;

[0035] The first switch 3 is provided between the first pump sealing water circulation system 1 and the vacuum pump sealing water circulation system 2, and the first switch 3 is used to connect or disconnect the liquid exchange between the first pump sealing water circulation system 1 and the vacuum pump sealing water circulation system 2;

[0036] The first pump water sealing circulation system 1 comprises a first pump water sealing unit 11 and an alkaline liquid storage tank 12 ; the alkaline liquid storage tank 12 is used to supply alkaline liquid to the first pump water sealing unit 11 .

[0037] The above-mentioned first pump sealing water circulation system 1 can be any kind of pump sealing water circulation system except the vacuum pump sealing water circulation system, such as: a centrifugal pump sealing water circulation system; the first pump in the first pump sealing water circulation system 1 can also be any kind of pump except the vacuum pump, such as a centrifugal pump.

[0038] The first pump sealing water circulation system 1 and the vacuum pump sealing water circulation system 2 are separately arranged; the alkaline liquid storage tank 12 supplies alkaline liquid, and creating an alkaline environment can slow down the corrosion rate of the metal surface of the mechanical seal, prolong the service life of the equipment, and the alkaline liquid can neutralize acidic substances such as nitric acid generated during the production of wet phosphoric acid;

[0039] Turning on the first switch 3 allows the alkaline liquid in the first pump sealing water circulation system 1 to flow into the vacuum pump sealing water circulation system 2, which can effectively neutralize the NO absorbed by the vacuum pump. X The gradually acidified seal water can prevent the acidic seal water from corroding any pump seal in the entire phosphate production system; and can extend the service life of all pump seals in the phosphate production process (including the first pump and the vacuum pump), so that all pump seals reach the designed service life, reduce replacement frequency and maintenance costs, and improve production efficiency.

[0040] Furthermore, the vacuum pump water sealing circulation system 2 comprises a vacuum pump water sealing unit 21 and a liquid storage tank 22;

[0041] The liquid storage tank 22 is connected to the vacuum pump water sealing unit 21;

[0042] The liquid storage tank 22 is used to replenish liquid into the vacuum pump water sealing unit 21 .

[0043] Specifically, a vacuum pump is provided in the vacuum pump water sealing unit 21;

[0044] Specifically, the vacuum pump sealing water circulation system 2 further includes a first pipeline 23 and a second pipeline 24;

[0045] The first pipe 23 and the second pipe 24 are both connected to the vacuum pump water sealing unit 21 and the liquid storage tank 22;

[0046] The first pipe 23 is used to transport the liquid in the liquid storage tank 22 to the vacuum pump water sealing unit 21;

[0047] The second pipe 24 is used to transport the liquid in the vacuum pump water sealing unit 21 to the liquid storage tank 22 .

[0048] That is, in the vacuum pump sealing water circulation system 2, the vacuum pump sealing water is circulated along the liquid storage tank 22, the first pipeline 23, the vacuum pump sealing water unit 21, and the second pipeline 24 in sequence; the vacuum pump sealing water circulates to take away the heat generated by the vacuum pump operation;

[0049] Specifically, the vacuum pump sealing water circulation system 2 also includes a liquid replenishing tank 26 connected to the liquid storage tank 22, and the liquid replenishing tank 26 is used to supply desalted water to the liquid storage tank 22. An appropriate amount of machine sealing water helps to reduce the vibration and noise of the vacuum pump in the vacuum pump sealing water unit 2 during operation, and improves the stability of the entire pump system. The provision of the liquid replenishing tank 26 can facilitate the replenishment of the vacuum pump sealing water circulation system 2 after the waste liquid in the vacuum pump sealing water circulation system 2 is discharged; in addition, the desalted water is water with a low content of strong electrolytes and a neutral pH value, which can avoid affecting the pH value in the vacuum pump sealing water circulation system 2.

[0050] Specifically, the vacuum pump sealing water circulation system 2 further includes a first water pump 25 disposed on the first pipeline 23. The first water pump 25 can provide power for the circulation of the vacuum pump sealing water, promote the vacuum pump sealing water circulation, and increase the cooling speed of the vacuum pump.

[0051] Furthermore, the first pump water sealing circulation system 1 also includes an alkaline liquid replenishing tank 17 connected to the alkaline liquid storage tank 12, and the alkaline liquid replenishing tank 17 is used to supply the secondary steam condensate generated by the concentration of diammonium phosphate to the alkaline liquid storage tank 12. In the production process of phosphate by wet phosphoric acid, the secondary steam condensate generated by the concentration of diammonium phosphate is alkaline, and the secondary steam condensate is generally discarded as waste process water. However, in the utility model, the secondary steam condensate is recovered and the alkaline secondary steam condensate is used as the machine sealing water in the first pump water sealing circulation system, so as to make full use of resources and reduce resource waste;

[0052] Furthermore, the first pump sealing water circulation system 1 further includes a third pipeline 13, a fourth pipeline 14, a third switch 15 and a fourth switch 16;

[0053] The third pipe 13 and the fourth pipe 14 are connected to the first pump water sealing unit 11 and the alkaline liquid storage tank 12;

[0054] The third pipeline 13 is used to transmit the liquid in the alkaline liquid storage tank 12 to the first pump water sealing unit 11;

[0055] The fourth pipe 14 is used to transfer the liquid in the first pump water sealing unit 11 to the alkaline liquid storage tank 12 .

[0056] That is, in the first pump sealing water circulation system 1, the pump sealing water circulates along the alkaline liquid storage tank 12, the third pipeline 13, the first pump sealing water unit 11, and the fourth pipeline 14 in sequence; the pump sealing water circulates to take away the heat generated by the pump operation.

[0057] The third switch 15 is disposed on the third pipe 13 to connect or disconnect the liquid exchange between the first pump water sealing unit 11 and the alkaline liquid storage tank 12;

[0058] The fourth switch 16 is disposed on the fourth pipeline 14 to connect or disconnect the liquid exchange between the first pump water sealing unit 11 and the alkaline liquid storage tank 12 , so as to control the flow of the water sealing water in the third pipeline 13 and the fourth pipeline 14 .

[0059] Specifically, the first pump sealing water circulation system 1 further includes a second water pump 18 disposed on the third pipe 13, and the second water pump 18 is disposed between the third switch 15 and the alkaline liquid storage tank 12. The second water pump 18 can provide power for the circulation of pump sealing water, promote the circulation of pump sealing water, and increase the cooling speed.

[0060] Specifically, the suction port of the second water pump 18 is 80mm-100mm away from the bottom of the alkaline liquid storage tank 12. In the process of producing phosphate by wet phosphoric acid, insoluble impurities such as calcium hydrogen phosphate are inevitably produced, and these impurities will become precipitates and settle at the bottom of the alkaline liquid storage tank 12. When the connection port between the second water pump 18 and the alkaline liquid storage tank 12 is set at the bottom of the alkaline liquid storage tank 12, the precipitates will enter the first pump sealing water circulation system 1 under the action of the second water pump 18. The precipitates will not only affect the cooling circulation effect of the pump sealing water, but also cause pipeline blockage; the distance of 80mm-100mm can accommodate more sediments, ensuring that the second water pump 18 inhales the supernatant, and ensuring that the water quality of the sealing water entering the first pump sealing water circulation system is clear.

[0061] Furthermore, it also includes a main pipe connected to the first pump water sealing circulation system 1 and the vacuum pump water sealing circulation system 2, and the sealing water in the first pump water sealing circulation system 1 and the vacuum pump water sealing circulation system 2 flows out from the main pipe; the main pipe is provided with a pH meter, and the pH meter is used to detect the acidity and alkalinity of the liquid in the main pipe, and accurately control the pH value in the water sealing system for phosphate production to ensure that the water quality meets the requirements for normal operation of the machine seal.

[0062] The first switch 3 , the third switch 15 and the fourth switch 16 as described above are all stop valves.

[0063] The working principle of the phosphate production machine sealing water system in this embodiment is as follows:

[0064] 1. Operation of the first pump sealing water circulation system 1:

[0065] When the first pump (such as a centrifugal pump) starts working, the third switch 15 and the fourth switch 16 are turned on. Under the drive of the second water pump 18, the alkaline liquid in the alkaline liquid storage tank 12 is pumped along the third pipe 13 to the first pump water sealing unit 11 to take away the heat generated by the pump operation. At the same time, it flows back to the alkaline liquid storage tank 12 through the fourth pipe 14 under the control of the fourth switch 16, forming a first pump water sealing cycle.

[0066] 2. Operation of vacuum pump sealing water circulation system 2:

[0067] The vacuum pump in the vacuum pump water sealing unit 21 starts to work, creating a vacuum environment. Driven by the first water pump 25, the liquid in the liquid storage tank 22 is pumped into the vacuum pump water sealing unit 21 along the first pipe 23 to remove the heat generated by the vacuum pump operation.

[0068] At the same time, the liquid in the vacuum pump water sealing unit 21 flows back to the liquid storage tank 22 through the second pipe 24, forming a vacuum pump water sealing cycle;

[0069] 3. Turn on the first switch 3

[0070] After the vacuum pump sealing water circulation system 2 has been working for a certain period of time (absorbing NO X、 The sealing water in the vacuum pump sealing water circulation system 2 is acidic), the first switch 3 is turned on, so that the sealing water in the first pump sealing water circulation system 1 flows into the vacuum pump sealing water circulation system 2, and the acidic sealing water in the vacuum pump sealing water circulation system 2 is neutralized.

[0071] The above is a specific description of the preferred implementation of the utility model, but the invention of the utility model is not limited to the described embodiments. Technical personnel familiar with the field can also make various equivalent deformations or substitutions without violating the spirit of the utility model. These equivalent deformations or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A mechanical sealing water system for phosphate production, characterized in that: include: A first pump sealing water circulation system (1), a vacuum pump sealing water circulation system (2) and a first switch (3); The first switch (3) is arranged between the first pump sealing water circulation system (1) and the vacuum pump sealing water circulation system (2); The first pump water sealing circulation system (1) comprises a first pump water sealing unit (11) and an alkaline liquid storage tank (12); the first pump water sealing unit (11) is connected to the alkaline liquid storage tank (12).

2. The machine sealing water system for phosphate production according to claim 1, characterized in that: The vacuum pump water sealing circulation system (2) comprises a vacuum pump water sealing unit (21) and a liquid storage tank (22); The liquid storage tank (22) is in communication with the vacuum pump water sealing unit (21); The liquid storage tank (22) is used to replenish liquid into the vacuum pump water sealing unit (21).

3. The machine sealing water system for phosphate production according to claim 2, characterized in that: The vacuum pump water sealing circulation system (2) further comprises a first pipeline (23) and a second pipeline (24); The first pipeline (23) and the second pipeline (24) are both connected to the vacuum pump water sealing unit (21) and the liquid storage tank (22); The first pipeline (23) is used to transport the liquid in the liquid storage tank (22) to the vacuum pump water sealing unit (21); The second pipeline (24) is used to transport the liquid in the vacuum pump water sealing unit (21) to the liquid storage tank (22).

4. The machine sealing water system for phosphate production according to claim 2, characterized in that: The vacuum pump water sealing circulation system (2) further comprises a liquid replenishing tank (26) connected to the liquid storage tank (22), wherein the liquid replenishing tank (26) is used to supply desalted water to the liquid storage tank (22).

5. The machine sealing water system for phosphate production according to claim 3, characterized in that: The vacuum pump sealing water circulation system (2) further comprises a first water pump (25) arranged on the first pipeline (23).

6. The machine sealing water system for phosphate production according to claim 1, characterized in that: The first pump sealing water circulation system (1) further comprises an alkaline liquid replenishing tank (17) connected to the alkaline liquid storage tank (12), and the alkaline liquid replenishing tank (17) can supply secondary steam condensate generated by diammonium phosphate concentration to the alkaline liquid storage tank (12).

7. The machine sealing water system for phosphate production according to claim 1 or 6, characterized in that: The first pump sealing water circulation system (1) further comprises a third pipeline (13), a fourth pipeline (14), a third switch (15) and a fourth switch (16); The third pipeline (13) and the fourth pipeline (14) are connected to the first pump water sealing unit (11) and the alkaline liquid storage tank (12); The third pipeline (13) is used to transmit the liquid in the alkaline liquid storage tank (12) to the first pump water sealing unit (11); The fourth pipeline (14) is used to transmit the liquid in the first pump water sealing unit (11) to the alkaline liquid storage tank (12); The third switch (15) is arranged on the third pipe (13); The fourth switch (16) is arranged on the fourth pipeline (14).

8. The machine sealing water system for phosphate production according to claim 7, characterized in that: The first pump-sealed water circulation system (1) further comprises a second water pump (18) arranged on the third pipeline (13); the second water pump (18) is arranged between the third switch (15) and the alkaline liquid storage tank (12).

9. The machine sealing water system for phosphate production according to claim 8, characterized in that: The suction port of the second water pump (18) is 80 mm to 100 mm away from the bottom of the alkaline liquid storage tank (12).

10. The machine sealing water system for phosphate production according to claim 1, characterized in that: It also comprises a main pipe connected to the first pump sealing water circulation system (1) and the vacuum pump sealing water circulation system (2), and a pH meter is provided on the main pipe.

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