Vacuum-pump-free absolute pressure reduction system of wet-process phosphoric acid concentration device

Abstract

The utility model discloses a vacuum-pump-free absolute pressure reduction system of a wet-process phosphoric acid concentration device, which comprises a first fluorine absorption tower, a second fluorine absorption tower, an atmospheric condenser and a steam injection unit, and a difluorine tower pipeline is fixedly mounted between the first fluorine absorption tower and the second fluorine absorption tower; an inlet pipe for receiving and conveying fluorine tail gas is fixedly mounted on the first fluorine absorption tower, and a first fluorine absorption tower circulating tank communicated with the first fluorine absorption tower is arranged at the bottom of the first fluorine absorption tower; a second fluorine absorption tower circulating tank communicated with the second fluorine absorption tower is arranged at the bottom of the second fluorine absorption tower; a second fluorine absorption circulating pump for pumping circulating water in the second fluorine absorption tower circulating tank is mounted on one side of the second fluorine absorption tower circulating tank. According to the utility model, the spraying area is effectively controlled by adjusting the spraying angle of the spray head of the spraying device, so that the gas-liquid contact is more sufficient in a limited pipeline, the spraying coverage area is reduced, and the system resistance is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of waste gas purification, and more specifically to an absolute pressure reduction system without a vacuum pump for a wet-process phosphoric acid concentration device. Background Art

[0002] First, the steam generated during the wet-process phosphoric acid concentration process consists of a large amount of water vapor and a very small amount of inert gases. When this steam encounters cooling water, the water vapor condenses and converts to liquid form, while the high-velocity cooling water can carry away the inert gases. However, if the cooling water flow rate is low, it is difficult for the non-condensable gases to be removed by the cooling water. In this case, if traditional tray-type spray and water curtain condensers are used for absorption condensation without a vacuum pump or steam ejector, the low cooling water flow rate results in low steam condensation efficiency and incomplete condensation.

[0003] The main differences between steam jet pumps and vacuum pumps lie in their operating principles and efficiency. Steam jet pumps use a high-velocity stream of steam to create negative pressure to draw in and move fluids, including gases and vapors. They are effective in extracting non-condensable gases, especially when handling large volumes of fluids and gases. The advantages of steam jet pumps are that they can handle fluids containing solid particles and require no mechanical moving parts, resulting in lower maintenance costs. However, steam jet pumps may not be as energy efficient as vacuum pumps, and in some applications, more steam may be required to create the required vacuum.

[0004] A vacuum pump is a device that mechanically reduces system pressure. It is typically used to remove gases or vapors to create a vacuum within the system. In the wet-process phosphoric acid concentration process, a vacuum pump can help quickly remove water vapor and non-condensable gases produced during evaporation, thereby accelerating the concentration process. Compared to steam ejectors, vacuum pumps generally offer higher efficiency and more precise pressure control. However, vacuum pumps may not be suitable for handling fluids containing solid particles and may require more frequent maintenance.

[0005] The system's vacuum degree after the main concentration device is increased mainly by a large amount of circulating water entering the atmospheric condenser to take away the gas in the vacuum equipment to create a vacuum. When the vacuum degree does not meet production requirements, the steam injection unit is turned on to compensate.

[0006] The circulating water vacuum extraction capacity is limited. The currently operating device can achieve a vacuum of about 20KPa by circulating water, and the circulating water volume required is 5000m³ / h. The vacuum degree required for normal operation of the device is about 13KPa, so it is necessary to turn on the steam injection unit to compensate; however, in actual use, the steam injection unit consumes medium-pressure steam pressure that can only reach 0.7-0.8Mpa, and the circulating water volume is 250m³ / h. Utility Model Content

[0007] In view of the problems existing in the prior art, the purpose of the present invention is to provide a vacuum pump-free absolute pressure reduction system for a wet-process phosphoric acid concentration device to solve the background technical problems.

[0008] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0009] The wet-process phosphoric acid concentration device has a vacuum pump-free absolute pressure reduction system, comprising a first fluorine absorption tower, a second fluorine absorption tower, an atmospheric condenser, and a steam injection unit, wherein a second fluorine tower pipeline is fixedly installed between the first fluorine absorption tower and the second fluorine absorption tower;

[0010] An inlet pipe for receiving and transporting fluorine tail gas is fixedly installed on the first fluorine absorption tower, and a first fluorine absorption tower circulation tank connected to the first fluorine absorption tower is provided at the bottom of the first fluorine absorption tower;

[0011] The bottom of the second fluorine absorption tower is provided with a second fluorine absorption tower circulation tank connected thereto, and a second fluorine absorption circulation pump for sucking the circulating water therein is installed on one side of the second fluorine absorption tower circulation tank, and a liquid infusion pipe is fixedly installed on the output port of the second fluorine absorption circulation pump, and the second fluorine absorption tower and the second fluorine tower pipeline are both connected to the second fluorine absorption circulation pump through the liquid infusion pipe;

[0012] The atmospheric condenser is connected to the second fluorine absorption tower through a pipeline, and the gas outlet of the atmospheric condenser is connected to the steam injection unit through a pipeline;

[0013] The steam injection unit is provided with inlets for introducing medium-pressure steam and acidic circulating cooling water respectively, and a recovery water tank connected thereto is provided at the bottom of the steam injection unit, and the water outlet of the atmospheric condenser is connected to the recovery water tank;

[0014] Six first connecting tubes are integrally formed on the difluoro tower pipeline, and the six first connecting tubes are fixedly connected to the end of the infusion tube. The six first connecting tubes extend to the interior of the second fluorine absorption tower and are fixedly connected to the first anti-blocking spray nozzle. The spraying direction of the first anti-blocking spray nozzle is the same as the gas flow direction in the difluoro tower pipeline, and the spraying angle range of the first anti-blocking spray nozzle is fifty to sixty degrees.

[0015] As a further description of the above technical solution:

[0016] The first anti-blocking spray heads in the infusion pipe that flow downstream are all located within the spraying range of the first anti-blocking spray heads adjacent upstream, and the downstream first anti-blocking spray heads are all located outside the spraying range of the first anti-blocking spray heads spaced upstream.

[0017] As a further description of the above technical solution:

[0018] A first fluorine absorption circulation pump for pumping circulating water inside the first fluorine absorption tower is fixedly installed on the circulation tank of the first fluorine absorption tower. The water outlet of the first fluorine absorption circulation pump is connected to the first fluorine absorption tower and the inlet pipe.

[0019] As a further description of the above technical solution:

[0020] Three second connecting pipes are provided inside the inlet pipe, the water outlet of the first fluorine absorption circulation pump is connected to the second connecting pipe, and one end of the second connecting pipe extends into the interior of the inlet pipe and is fixedly connected to a second anti-blocking spray nozzle.

[0021] As a further description of the above technical solution:

[0022] The spraying direction of the second anti-blocking spray nozzle is the same as the flow direction of the gas entering the pipe, and the spraying angle range of the second anti-blocking spray nozzle is fifty to sixty degrees.

[0023] As a further description of the above technical solution:

[0024] The circulation tank of the first fluorine absorption tower is provided with a supplementary pipe connected to external process water.

[0025] As a further description of the above technical solution:

[0026] The inlet pipe and the difluoro tower pipeline are both smoothly arranged.

[0027] Compared with the prior art, the advantages of the present invention are:

[0028] This solution effectively controls the spraying area by adjusting the spraying angle of the nozzle of the spray device to allow more complete gas-liquid contact in a limited pipeline while reducing the coverage area of ​​the spray and lowering the system resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a system schematic diagram of the utility model;

[0030] Figure 2 This is a schematic diagram of the process of wet-process phosphoric acid concentration of the utility model;

[0031] Figure 3 This is a schematic diagram of the cross-sectional structure of the difluoro tower pipeline of the utility model;

[0032] Figure 4 This is a schematic diagram of the cross-sectional structure of the inlet pipe of the utility model.

[0033] Description of the numbers in the figure:

[0034] 100, first fluorine absorption tower; 110, inlet pipe; 111, second connecting pipe; 112, second anti-blocking spray nozzle; 120, first fluorine absorption tower circulation tank; 121, replenishing pipe; 130, first fluorine absorption circulation pump; 200, second fluorine absorption tower; 210, second fluorine absorption tower circulation tank; 220, second fluorine absorption circulation pump; 230, infusion pipe; 300, atmospheric condenser; 400, steam injection unit; 410, recovery water tank; 500, second fluorine tower pipeline; 510, first connecting pipe; 520, first anti-blocking spray nozzle. DETAILED DESCRIPTION

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention;

[0036] See also Figure 1-4 , the utility model provides the following embodiments:

[0037] The wet-process phosphoric acid concentration device has no vacuum pump absolute pressure reduction system and includes a first fluorine absorption tower 100, a second fluorine absorption tower 200, an atmospheric condenser 300 and a steam injection unit 400. A second fluorine tower pipeline 500 is fixedly installed between the first fluorine absorption tower 100 and the second fluorine absorption tower 200.

[0038] An inlet pipe 110 for receiving and transporting fluorine tail gas is fixedly installed on the first fluorine absorption tower 100 , and a first fluorine absorption tower circulation tank 120 communicating therewith is provided at the bottom of the first fluorine absorption tower 100 .

[0039] A second fluorine absorption tower circulation tank 210 connected to the second fluorine absorption tower 200 is provided at the bottom thereof, and a second fluorine absorption circulation pump 220 for sucking the circulating water therein is installed on one side of the second fluorine absorption tower circulation tank 210. A liquid infusion pipe 230 is fixedly installed at the output port of the second fluorine absorption circulation pump 220, and the second fluorine absorption tower 200 and the second fluorine tower pipeline 500 are both connected to the second fluorine absorption circulation pump 220 through the liquid infusion pipe 230.

[0040] The atmospheric condenser 300 is connected to the second fluorine absorption tower 200 through a pipeline, and the gas outlet of the atmospheric condenser 300 is connected to the steam injection unit 400 through a pipeline.

[0041] The steam injection unit 400 is provided with inlets for introducing medium-pressure steam and acidic circulating cooling water respectively. A recovery water tank 410 connected thereto is provided at the bottom of the steam injection unit 400 . The water outlet of the atmospheric condenser 300 is connected to the recovery water tank 410 .

[0042] Six first connecting tubes 510 are integrally formed on the difluoro tower pipeline 500. The six first connecting tubes 510 are all fixedly connected to the end of the infusion tube 230. The six first connecting tubes 510 extend to the interior of the second fluorine absorption tower 200 and are fixedly connected to the first anti-blocking spray nozzle 520. The spraying direction of the first anti-blocking spray nozzle 520 is the same as the gas flow direction in the difluoro tower pipeline 500. The spraying angle range of the first anti-blocking spray nozzle 520 is fifty to sixty degrees.

[0043] The fluorine-containing tail gas is introduced into the interior of the first fluorine absorption tower 100 through the inlet pipe 110, and then sprayed and liquefied for absorption. The water that absorbs fluorine is collected into the interior of the first fluorine absorption tower circulation tank 120. The remaining incompletely purified gas is introduced into the interior of the second fluorine absorption tower 200 through the second fluorine tower pipeline 500, and the gas is further purified and absorbed. The absorbed liquid is introduced into the second fluorine absorption tower circulation tank 210 for collection. The second fluorine absorption circulation pump 220 extracts the circulating water in the second fluorine absorption tower circulation tank 210 and re-injects it into the second fluorine absorption tower 200 through the liquid infusion pipe 230 for spraying to complete the cycle. The purified gas is then further cooled and liquefied through the atmospheric condenser 300 to remove steam. A large amount of circulating water enters the atmospheric condenser 300 to take away the gas in the equipment and generate a vacuum. When the vacuum degree does not meet production requirements, the medium-pressure steam and acidic circulating cooling water are input into the steam injection unit 400 to form a high-speed steam flow. The high-speed steam flow is used to generate negative pressure to inhale and move gas and steam, which can effectively extract non-condensable gases.

[0044] In this process, part of the circulating water drawn out by the second fluorine absorption circulation pump 220 is diverted through the infusion pipe 230, and then input into the six first connecting pipes 510, and the circulating water is sprayed out through the first anti-blocking spray nozzle 520, wherein the spray angle range of the first anti-blocking spray nozzle 520 is fifty to sixty degrees, thereby further allowing the gas-liquid contact to be more sufficient in the limited space of the difluoro tower pipeline 500, while reducing the coverage area of ​​the spray and reducing the system resistance, thereby reducing the vacuum usage demand.

[0045] See also Figure 3 The first anti-blocking spray heads 520 to which the gas in the infusion pipe 230 flows downstream are all located within the spraying range of the first anti-blocking spray heads 520 adjacent to their upstream, and the first anti-blocking spray heads 520 downstream are all located outside the spraying range of the first anti-blocking spray heads 520 spaced upstream.

[0046] Ensure that the position of each first anti-blocking spray nozzle 520 is reasonably set within the limited pipeline, ensure the spraying range of the six first anti-blocking spray nozzles 520 and reduce the resistance in the pipeline.

[0047] See also Figure 1 、 2 4. A first fluorine absorption circulation pump 130 for pumping circulating water therein is fixedly installed on the first fluorine absorption tower circulation tank 120. The water outlet of the first fluorine absorption circulation pump 130 is connected to the first fluorine absorption tower 100 and the inlet pipe 110.

[0048] The first fluorine absorption circulation pump 130 is used to circulate the circulating water from the first fluorine absorption tower circulation tank 120 to the first fluorine absorption tower 100 and the interior of the inlet pipe 110 for spraying.

[0049] Three second connecting pipes 111 are provided inside the inlet pipe 110 , the water outlet of the first fluorine absorption circulation pump 130 is connected to the second connecting pipe 111 , one end of the second connecting pipe 111 extends to the inside of the inlet pipe 110 and is fixedly connected to a second anti-blocking spray nozzle 112 .

[0050] The spraying direction of the second anti-blocking spray nozzle 112 is the same as the flow direction of the gas entering the pipe 110, and the spraying angle range of the second anti-blocking spray nozzle 112 is fifty to sixty degrees.

[0051] Part of the circulating water drawn out by the first fluorine absorption circulation pump 130 is diverted through the liquid delivery pipe 230, and then input into the second connecting pipe 111, and the circulating water is sprayed out through the second anti-blocking spray nozzle 112, wherein the spray angle range of the second anti-blocking spray nozzle 112 is fifty to sixty degrees, thereby further allowing the gas-liquid contact to be more sufficient in the limited space inlet pipe 110, while reducing the coverage area of ​​the spray and reducing the system resistance, thereby reducing the vacuum usage demand.

[0052] See also Figure 1 and Figure 2 The first fluorine absorption tower circulation tank 120 is provided with a supplementary pipe 121 connected to external process water.

[0053] The circulating water lost in the first fluorine absorption tower 100 and the first fluorine absorption tower circulation tank 120 is replenished to ensure the absorption effect of fluorine-containing gas.

[0054] The inlet pipe 110 and the difluoro tower pipeline 500 are both smoothly arranged.

[0055] The friction between the system inlet pipe 110 and the inner wall of the difluoro tower pipeline 500 is reduced, and the fluid resistance is reduced, thereby reducing the gas's requirement for vacuum.

[0056] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto. Any person skilled in the art who, within the technical scope disclosed in the present invention, makes equivalent substitutions or modifications based on the technical solutions and improved concepts of the present invention shall be covered by the scope of protection of the present invention.

Claims

1. A wet-process phosphoric acid concentration device without a vacuum pump absolute pressure reduction system, characterized in that: It comprises a first fluorine absorption tower (100), a second fluorine absorption tower (200), an atmospheric condenser (300) and a steam injection unit (400), wherein a second fluorine tower pipeline (500) is fixedly installed between the first fluorine absorption tower (100) and the second fluorine absorption tower (200); An inlet pipe (110) for receiving and transporting fluorine tail gas is fixedly installed on the first fluorine absorption tower (100), and a first fluorine absorption tower circulation tank (120) connected to the first fluorine absorption tower (100) is provided at the bottom of the first fluorine absorption tower (100); A second fluorine absorption tower circulation tank (210) is provided at the bottom of the second fluorine absorption tower (200) and is in communication therewith. A second fluorine absorption circulation pump (220) for sucking circulating water therein is installed on one side of the second fluorine absorption tower circulation tank (210). A liquid infusion pipe (230) is fixedly installed at the output port of the second fluorine absorption circulation pump (220). The second fluorine absorption tower (200) and the second fluorine tower pipeline (500) are both connected to the second fluorine absorption circulation pump (220) via the liquid infusion pipe (230). The atmospheric condenser (300) is connected to the second fluorine absorption tower (200) through a pipeline, and the gas outlet of the atmospheric condenser (300) is connected to the steam injection unit (400) through a pipeline; The steam injection unit (400) is provided with inlets for respectively introducing medium-pressure steam and acidic circulating cooling water. The bottom of the steam injection unit (400) is provided with a recovery water tank (410) connected thereto. The water outlet of the atmospheric condenser (300) is connected to the recovery water tank (410). Six first connecting tubes (510) are integrally formed on the difluoro tower pipeline (500), and the six first connecting tubes (510) are fixedly connected to the end of the infusion tube (230). The six first connecting tubes (510) extend into the interior of the second fluorine absorption tower (200) and are fixedly connected to a first anti-blocking spray nozzle (520). The spraying direction of the first anti-blocking spray nozzle (520) is the same as the gas flow direction in the difluoro tower pipeline (500), and the spraying angle range of the first anti-blocking spray nozzle (520) is fifty to sixty degrees.

2. The vacuum pump-free absolute pressure reduction system for a wet-process phosphoric acid concentration device according to claim 1, characterized in that: The first anti-blocking spray nozzles (520) of the gas flowing downstream in the liquid delivery pipe (230) are all located within the spraying range of the first anti-blocking spray nozzles (520) adjacent to them upstream, and the first anti-blocking spray nozzles (520) downstream are all located outside the spraying range of the first anti-blocking spray nozzles (520) spaced upstream.

3. The vacuum pump-free absolute pressure reduction system for a wet-process phosphoric acid concentration device according to claim 1, characterized in that: A first fluorine absorption circulation pump (130) for pumping circulating water therein is fixedly installed on the first fluorine absorption tower circulation tank (120), and a water outlet of the first fluorine absorption circulation pump (130) is connected to the first fluorine absorption tower (100) and the inlet pipe (110).

4. The vacuum pump-free absolute pressure reduction system for a wet-process phosphoric acid concentration device according to claim 3, characterized in that: Three second connecting pipes (111) are provided inside the inlet pipe (110), the water outlet of the first fluorine absorption circulation pump (130) is connected to the second connecting pipe (111), and one end of the second connecting pipe (111) extends into the interior of the inlet pipe (110) and is fixedly connected to a second anti-blocking spray nozzle (112).

5. The vacuum pump-free absolute pressure reduction system for a wet-process phosphoric acid concentration device according to claim 4, characterized in that: The spraying direction of the second anti-blocking spray nozzle (112) is the same as the flow direction of the gas entering the pipe (110), and the spraying angle range of the second anti-blocking spray nozzle (112) is fifty to sixty degrees.

6. The vacuum pump-free absolute pressure reduction system for a wet-process phosphoric acid concentration device according to claim 1, characterized in that: The first fluorine absorption tower circulation tank (120) is provided with a supplementary pipe (121) connected to external process water.

7. The vacuum pump-free absolute pressure reduction system for a wet-process phosphoric acid concentration device according to claim 1, characterized in that: The inlet pipe (110) and the difluoro tower pipeline (500) are both smoothly arranged.

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