A condensation and filtration device for ammonium nitrate process

Abstract

This utility model discloses a condensation and filtration device for ammonium nitrate production, belonging to the field of ammonium nitrate production technology. It includes a feed pipe, a primary filtration unit, a centrifugal separation chamber, a secondary filtration unit, and a collection tank. The feed pipe has an atomizing nozzle at its end, which is connected to the top of a cyclone condenser. The bottom outlet of the cyclone condenser is connected to the primary filtration unit, which includes a multi-layer gradient metal sintered mesh and a vibration cleaning mechanism. The upper part of the centrifugal separation chamber is connected to the primary filtration unit via a spiral guide channel. The secondary filtration unit includes a coaxially arranged porous ceramic membrane tube and an activated carbon adsorption layer sleeved on the outside of the porous ceramic membrane tube. The secondary filtration unit is connected to the bottom of the centrifugal separation chamber via a guide pipe. The collection tank is connected below the secondary filtration unit via a quick-release flange. This application can achieve comprehensive interception of solid suspended matter of different particle sizes, significantly improving the filtration accuracy and stability of the condensate.

Description

Technical Field

[0001] This utility model belongs to the field of ammonium nitrate production technology, and specifically relates to a condensation and filtration device for ammonium nitrate process. Background Technology

[0002] The production of ammonium nitrate generates a large amount of process condensate, which contains pollutants such as suspended solids and ammonia nitrogen. Current technologies typically employ electrodialysis and reverse osmosis for treatment, but these methods have the following drawbacks:

[0003] 1. Electrodialysis and reverse osmosis membranes are easily clogged by suspended solids, leading to reduced treatment efficiency and increased maintenance costs;

[0004] 2. The existing pretreatment process uses a combination of primary melt-blown filter cartridge filtration and secondary ceramic filter cartridge filtration, which has high operating costs and the suspended solids content after treatment still does not meet the solids content requirements of electrodialysis feed water.

[0005] 3. High concentrations of suspended solids can cause clogging and fouling of electrodialysis and reverse osmosis membranes, resulting in reduced product water volume, decreased membrane desalination rate, increased pressure difference between feed water and concentrate, which in turn reduces membrane flux, shortens membrane life, and increases maintenance costs.

[0006] Therefore, it is necessary to develop a new ammonium nitrate process condensation and filtration device. Summary of the Invention

[0007] To address the aforementioned problems, this utility model discloses a condensation and filtration device for ammonium nitrate processes. The primary filtration unit employs a multi-layer gradient metal sintered mesh, which can effectively intercept larger particles of suspended solids. The porous ceramic membrane tube in the secondary filtration unit can further filter micron-sized solid particles. This two-stage filtration combination can achieve comprehensive interception of suspended solids of different particle sizes, significantly improve the filtration accuracy of the condensate, and ensure that the content of suspended solids in the treated condensate is low, meeting the water quality requirements of subsequent processes.

[0008] To achieve the above objectives, the specific technical solution of this application is as follows:

[0009] A condensation and filtration device for ammonium nitrate processes includes a feed pipe, a primary filtration unit, a centrifugal separation chamber, a secondary filtration unit, and a collection tank. The feed pipe has an atomizing nozzle at its end, which is connected to the top of a cyclone condenser. The bottom outlet of the cyclone condenser is connected to the primary filtration unit, which includes a multi-layer gradient metal sintered mesh and a vibration cleaning mechanism. The upper part of the centrifugal separation chamber is connected to the primary filtration unit via a spiral guide channel. The secondary filtration unit includes a coaxially arranged porous ceramic membrane tube and an activated carbon adsorption layer sleeved on the outside of the porous ceramic membrane tube. The secondary filtration unit is connected to the bottom of the centrifugal separation chamber via a guide pipe. The collection tank is connected below the secondary filtration unit via a quick-release flange.

[0010] Based on the above technical features, the device further includes a backflushing cleaning system, which includes branch lines connected to the air compressor, and the branch lines extend to the back side of the filter surfaces of the primary filter unit and the secondary filter unit, respectively.

[0011] Based on the above technical features, preferably, the gradient metal sintered mesh is composed of at least three layers of 316L stainless steel sintered mesh with different pore sizes, and the mesh size of the metal sintered mesh gradually increases along the material flow direction.

[0012] Based on the above technical features, the centrifugal separation chamber is further provided with an adjustable speed centrifugal drum, which adopts a conical cylindrical structure with guide fins evenly distributed on the inner wall.

[0013] Based on the above technical features, preferably, the cone angle of the conical cylinder structure of the centrifugal drum is 15°-25°, and the height of the guide fins is 8-12mm.

[0014] Based on the above technical features, preferably, the porous ceramic membrane tube has a gradient pore size structure, with filtration layers of 5μm, 1μm, and 0.5μm arranged radially from the outside to the inside.

[0015] Based on the above technical features, preferably, the backflush cleaning system is equipped with a pressure sensor and an electromagnetic pulse valve, which automatically starts the backflush program when the filtration pressure difference reaches 0.15MPa.

[0016] Compared with the prior art, the beneficial effects of this application are as follows:

[0017] This application utilizes a multi-layer gradient metal sintered mesh in the primary filtration unit, which can effectively intercept larger particles of suspended solids. The porous ceramic membrane tube in the secondary filtration unit can further filter micron-sized solid particles. This two-stage filtration combination can achieve comprehensive interception of suspended solids of different particle sizes, significantly improve the filtration accuracy of condensate, ensure that the content of suspended solids in the treated condensate is low, and meet the water quality requirements of subsequent processes.

[0018] The vibration cleaning mechanism of the primary filter unit and the back-flushing cleaning system of the secondary filter unit can remove impurities from the filter unit in a timely manner, prevent filter screen clogging, maintain the efficient operation of the filter unit, improve the stability and reliability of the filtration system, reduce system downtime caused by filter unit clogging, and ensure the continuous and stable operation of the entire ammonium nitrate process condensation filtration device.

[0019] The centrifugal separation chamber can efficiently remove solid particles from liquids, thereby reducing the filtration pressure and replacement frequency of the porous ceramic membrane tubes in the secondary filtration unit, and further reducing operating costs. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the main structure of a condensation and filtration device for an ammonium nitrate process according to the present invention;

[0021] Figure 2 This is a side view of the structure of a condensation and filtration device for an ammonium nitrate process according to the present invention.

[0022] List of identifiers in attached diagrams:

[0023] 1. Feed pipe; 2. Atomizing nozzle; 3. Cyclone condenser; 4. Primary filter unit; 401. Gradient metal sintered mesh; 402. Vibration cleaning mechanism; 5. Centrifugal separation chamber; 501. Centrifugal drum; 502. Guide fins; 6. Spiral guide channel; 7. Secondary filter unit; 701. Porous ceramic membrane tube; 702. Activated carbon adsorption layer; 8. Guide pipe; 9. Liquid collection tank; 10. Quick-release flange; 11. Backflush cleaning system; 1101. Air compressor; 1102. Branch pipeline; 1103. Pressure sensor; 1104. Electromagnetic pulse valve. Detailed Implementation

[0024] The present invention will be further illustrated below with reference to the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are for illustrative purposes only and are not intended to limit the scope of the invention.

[0025] It should be noted that the terms "upper," "lower," "left," "right," "front," and "rear" used in the following description refer to the directions shown in the accompanying drawings, while the terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively. Furthermore, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between 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.

[0026] like Figure 1 As shown, an ammonium nitrate process condensation and filtration device includes a feed pipe 1, a primary filtration unit 4, a centrifugal separation chamber 5, a secondary filtration unit 7, and a collection tank 9. The feed pipe 1 has an atomizing nozzle 2 at its end, which is connected to the top of a cyclone condenser 3. The bottom outlet of the cyclone condenser 3 is connected to the primary filtration unit 4. Preferably, the primary filtration unit 4 is placed at an angle and includes a multi-layer gradient metal sintered mesh 401 and a vibration cleaning mechanism 402. The upper part of the centrifugal separation chamber 5 is connected to the primary filtration unit 4 through a spiral guide channel 6.

[0027] The secondary filtration unit 7 is connected to the bottom of the centrifuge chamber 5 via a guide pipe 8. The secondary filtration unit 7 includes a coaxially arranged porous ceramic membrane tube 701 and an activated carbon adsorption layer 702 sleeved outside the porous ceramic membrane tube. The porous ceramic membrane tube 701 has a gradient pore size structure, with filtration stages of 5μm, 1μm, and 0.5μm arranged radially from the outside to the inside. The liquid flowing down from the guide pipe is filtered radially from the outside to the inside and then enters the collection tank 9 from the outlet. The collection tank 9 is connected to the lower part of the secondary filtration unit 7 via a quick-release flange 10.

[0028] like Figure 2 As shown, the device also includes a backflush cleaning system 11, which includes a branch pipe 1102 connected to the air compressor 1101. The branch pipe 1102 extends to the back side of the filter surface of the primary filter unit 4 and the secondary filter unit 7, respectively.

[0029] The gradient metal sintered mesh 401 is composed of at least three layers of 316L stainless steel sintered mesh with different pore sizes, and the mesh size of the metal sintered mesh gradually increases along the material flow direction.

[0030] The centrifugal separation chamber 5 is equipped with an adjustable speed centrifugal drum 501. The centrifugal drum 501 adopts a conical cylindrical structure, and the inner wall is equidistantly distributed with guide fins 502.

[0031] The cone angle of the conical cylindrical structure of the centrifugal drum 501 is 15°-25°, and the height of the guide fins is 8-12mm.

[0032] The backflush cleaning system 11 is equipped with a pressure sensor 1103 and an electromagnetic pulse valve 1104. When the filtration pressure difference reaches 0.15MPa, the backflush program is automatically started.

[0033] Work steps:

[0034] Turn on the power to the air compressor 1101 and the centrifugal drum 501, and set the speed of the centrifugal drum; input the ammonium nitrate process condensate into the device through the feed pipe 1; observe the operation of the cyclone condenser 3 and the primary filter unit 4 to ensure that the liquid flows smoothly into the primary filter unit; check the operating status of the centrifugal separation chamber 5 to ensure that the centrifugal drum 501 rotates stably and the separation effect is good; observe the pressure change of the secondary filter unit 7 to ensure that the filtration process is smooth; the treated liquid flows into the collection tank 9, which can be discharged or reused periodically.

[0035] Based on the monitoring data of the pressure sensor 1103, the electromagnetic pulse valve 1104 is activated in a timely manner to perform backflushing cleaning and maintain the cleanliness of the filter unit.

[0036] It is important to regularly check the sealing of all connecting pipes to prevent liquid leaks; regularly maintain the air compressor 1101 and centrifugal drum 501 to ensure their normal operation. Adjust the frequency and pressure of backflushing cleaning according to actual operating conditions to achieve the best cleaning effect. Replace the activated carbon adsorption layer 702 regularly to ensure its adsorption effect.

[0037] It should be noted that the accompanying drawings merely illustrate the technical concept of the present invention and should not be used to limit the scope of protection of the present invention. For those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and all such improvements and modifications fall within the scope of protection of the claims of the present invention.

Claims

1. An ammonium nitrate process condensate filtration apparatus, characterized by: The system includes a feed pipe (1), a primary filtration unit (4), a centrifugal separation chamber (5), a secondary filtration unit (7), and a collection tank (9). The feed pipe (1) is equipped with an atomizing nozzle (2) at its end, which is connected to the top of a cyclone condenser (3). The bottom outlet of the cyclone condenser (3) is connected to the primary filtration unit (4), which includes a multi-layer gradient metal sintered mesh (401) and a vibration cleaning mechanism (402). The upper part of the centrifugal separation chamber (5) is connected to the primary filtration unit (4) through a spiral guide channel (6). The secondary filtration unit (7) includes a coaxially arranged porous ceramic membrane tube (701) and an activated carbon adsorption layer (702) sleeved on the outside of the porous ceramic membrane tube. The secondary filtration unit (7) is connected to the bottom of the centrifugal separation chamber (5) through a guide pipe (8). The collection tank (9) is connected to the lower part of the secondary filtration unit (7) through a quick-release flange (10).

2. The apparatus of claim 1, wherein: It also includes a backflush cleaning system (11), which includes a branch line (1102) connected to the air compressor (1101) and the branch line (1102) extending to the back side of the filter surface of the primary filter unit (4) and the secondary filter unit (7), respectively.

3. The apparatus of claim 1, wherein: The gradient metal sintered mesh (401) consists of at least three layers of 316L stainless steel sintered mesh with different apertures, and the mesh size gradually increases along the material flow direction.

4. The apparatus of claim 1, wherein: The centrifugal separation chamber (5) is equipped with an adjustable speed centrifugal drum (501). The centrifugal drum (501) adopts a conical cylindrical structure with guide fins (502) evenly distributed on the inner wall.

5. The apparatus of claim 4, wherein: The cone angle of the conical cylinder structure of the centrifugal drum (501) is 15°-25°, and the height of the guide fins is 8-12mm.

6. The apparatus of claim 1, wherein: The porous ceramic membrane tube (701) has a gradient pore size structure, with the pore size decreasing from the outside to the inside in the radial direction.

7. The apparatus of claim 2, wherein: The backflush cleaning system (11) is equipped with a pressure sensor (1103) and an electromagnetic pulse valve (1104).

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