Cross-break structure for swenson phosphoric acid concentration process

Abstract

The utility model provides a kind of cross break structure for Swenson phosphoric acid concentration process, its technical scheme is: including cross break cylinder, first baffle and second baffle are fixed in the inner wall of cross break cylinder, first baffle and second baffle are mutually perpendicular arrangement, the size of first baffle and second baffle is exactly the same, first flange and second flange are fixed in the top and bottom of cross break cylinder, first flange is connected with the lower liquid pipe of flash chamber, and the import of second flange is connected with axial flow pump.The utility model has the beneficial effects that: (1) strengthen structural stability, resist vortex scouring and vibration;(2) optimize flow state control, guarantee the efficient operation of axial flow pump.

Description

Technical Field

[0001] This utility model belongs to the technical field of phosphoric acid concentration-related accessories, and in particular relates to a cross-shaped crusher structure used in the Swensen phosphoric acid concentration process. Background Technology

[0002] In wet-process phosphoric acid production, the Swensen phosphoric acid concentration process is the core step in achieving phosphoric acid concentration. It utilizes the coordinated operation of a flash chamber and an axial flow pump to circulate and concentrate a slurry containing 22-46% phosphoric acid. The "cross-breaker" located between the flash chamber's lower liquid pipe and the axial flow pump inlet is a key piece of equipment. Its core function is to break up large vortices generated during slurry flow and eliminate air bubbles through the internal guide plate design, thereby stabilizing the material flow at the axial flow pump inlet, reducing the risk of pump cavitation, and ensuring continuous system operation.

[0003] However, the internal guide vanes of existing cross-shaped breakers have significant defects in practical applications, leading to frequent system shutdowns. The specific problems are as follows:

[0004] (1) The guide plate is prone to corrosion and falling off: Due to the high concentration of phosphoric acid in the slurry (22-46%) and the presence of corrosive components such as fluoride ions, traditional guide plates are mostly made of ordinary stainless steel (such as 316L), which has insufficient corrosion resistance. After long-term use, the structural strength will decrease due to corrosion and thinning, and eventually fall off the cross-shaped crusher body.

[0005] (2) Poor structural stability and easy to break under scouring: The existing connection between the guide plate and the cylinder mostly relies on a single welding fixation, and the plate thickness is relatively thin. During the circulation process, the slurry generates a strong vortex due to the negative pressure of the flash chamber. The guide plate is subjected to high-frequency scouring force for a long time, which easily leads to fatigue cracking of the weld. At the same time, the thin plate is prone to vibration and swaying under the impact of the vortex, which further aggravates the stress concentration at the weld and accelerates the detachment and breakage.

[0006] (3) High maintenance costs and impact on system continuity: When the guide plate falls off, the detached plate is easily sucked into the axial flow pump, causing the pump to jam and forcing the entire concentration system to shut down urgently. Existing solutions require removing the cross crusher, reinforcing or replacing the internal guide plate, and reinstalling it. Each maintenance requires a shutdown of 2-3 days, which not only causes production loss, but also increases maintenance risks due to the high labor intensity of working at height and disassembling and assembling equipment, seriously affecting the start-up rate and production stability of the unit. Summary of the Invention

[0007] To address the problems in the prior art, this utility model provides a cross-shaped crusher structure for the Swensen phosphoric acid concentration process. The technical solution is as follows: it includes a cross-shaped crusher cylinder, on the inner wall of which a first guide plate and a second guide plate are fixedly provided. The first guide plate and the second guide plate are arranged perpendicular to each other and have the same size. A first flange and a second flange are fixedly provided at the top and bottom of the cross-shaped crusher cylinder. The first flange is connected to the lower liquid pipe of the flash chamber, and the second flange is connected to the inlet of the axial flow pump.

[0008] In a preferred embodiment, the two sides of the first and second guide plates are welded and fixed to the inner wall of the cross-shaped crusher.

[0009] In a preferred embodiment, the first guide plate and the second guide plate have a first groove and a second groove on one side, and the first guide plate and the second guide plate are interlocked with each other through the first groove and the second groove. The length of the first groove is half the length of the first guide plate, the length of the second groove is half the length of the second guide plate, and the lengths of the first groove and the second groove are the same.

[0010] In a more preferred embodiment, the snap-fit ​​joint between the first guide plate and the second guide plate is fixed by welding.

[0011] In a more preferred embodiment, the thickness of the first guide plate and the second guide plate is at least 10 mm.

[0012] In a more preferred embodiment, the width of the first groove is the same as the thickness of the second guide plate, and the width of the second groove is the same as the thickness of the first guide plate.

[0013] In a preferred embodiment, the first flange and the second flange are provided with a plurality of first flange bolt holes and second flange bolt holes. The first flange is connected to the liquid outlet pipe of the flash chamber by bolts passing through the first flange bolt holes, and the second flange is connected to the inlet of the axial flow pump by bolts passing through the second flange bolt holes.

[0014] In a preferred embodiment, the cross-shaped crusher body, the first guide plate, the second guide plate, the first flange, and the second flange are all made of 2507 stainless steel.

[0015] The beneficial effects of this utility model are:

[0016] (1) The first guide plate and the second guide plate are fixed by both groove snap-fit ​​and welding. The groove design makes the two plates interlock to form an integral frame. Combined with the welding reinforcement at the snap-fit, the shear strength is improved compared with the single welding connection, and it effectively resists the high-frequency scouring of the slurry vortex.

[0017] The guide plate is at least 10mm thick and has the same size to ensure that it is not prone to vibration and swaying under strong impact, avoid stress concentration in the weld caused by deformation of thin plate, significantly reduce the risk of weld failure and fracture, and ensure long-term stable operation of the guide plate.

[0018] (2) The first guide plate and the second guide plate are perpendicular to each other and have the same size. With precise groove snapping, they can evenly divide the internal space of the cross crusher cylinder, efficiently crush the slurry vortex, eliminate air bubbles, ensure the stability of the axial flow pump inlet flow, reduce the risk of cavitation, and improve the pump body operating efficiency and service life. Attached Figure Description

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

[0020] Figure 2 A schematic diagram of the connection between the first guide plate and the second guide plate in this utility model.

[0021] In the diagram: 1. Cross-shaped breaker body; 2. First guide plate; 3. Second guide plate; 4. First flange; 5. Second flange; 6. First groove; 7. Second groove; 8. First flange bolt hole; 9. Second flange bolt hole. Detailed Implementation

[0022] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0023] Example

[0024] like Figure 1-2 The cross-shaped crusher structure shown for the Swensen phosphoric acid concentration process includes a cross-shaped crusher cylinder 1. A first guide plate 2 and a second guide plate 3 are fixedly provided on the inner wall of the cross-shaped crusher cylinder 1. The first guide plate 2 and the second guide plate 3 are arranged perpendicular to each other. The first guide plate 2 and the second guide plate 3 are exactly the same size. A first flange 4 and a second flange 5 are fixedly provided at the top and bottom of the cross-shaped crusher cylinder 1. The first flange 4 is connected to the lower liquid pipe of the flash chamber, and the second flange 5 is connected to the inlet of the axial flow pump.

[0025] Furthermore, the first guide plate 2 and the second guide plate 3 are welded and fixed to the inner wall of the cross-shaped crusher body 1 on both sides. The welding method is manual submerged arc welding, and the plate bevel is ground and fully welded with a full weld.

[0026] Furthermore, the first guide plate 2 and the second guide plate 3 have a first groove 6 and a second groove 7 on one side. The first guide plate 2 and the second guide plate 3 are interlocked through the first groove 6 and the second groove 7. The length of the first groove 6 is half the length of the first guide plate 2, and the length of the second groove 7 is half the length of the second guide plate 3. The lengths of the first groove 6 and the second groove 7 are the same, ensuring that the first guide plate 2 and the second guide plate 3 are staggered and flush after being interlocked.

[0027] Furthermore, the connection between the first guide plate 2 and the second guide plate 3 is fixed by welding. The welding method is manual submerged arc welding, and the plate bevel is fully welded and the weld seam is full.

[0028] Furthermore, the thickness of the first guide plate 2 and the second guide plate 3 is at least 10 mm to ensure that the guide plates will not swing under the flushing of phosphoric acid.

[0029] Furthermore, the width of the first groove 6 is the same as the thickness of the second guide plate 3, and the width of the second groove 7 is the same as the thickness of the first guide plate 2, to prevent accidents caused by welding quality problems after the snap-fit ​​is completed.

[0030] Furthermore, the first flange 4 and the second flange 5 are provided with a plurality of first flange bolt holes 8 and second flange bolt holes 9. The first flange 4 is flange-connected to the liquid outlet pipe of the flash chamber by bolts passing through the first flange bolt holes 8. The second flange 5 is flange-connected to the inlet of the axial flow pump by bolts passing through the second flange bolt holes 9.

[0031] Furthermore, the cross-shaped crusher body 1, the first guide plate 2, the second guide plate 3, the first flange 4, and the second flange 5 are all made of 2507 stainless steel to prevent the guide plates from falling off due to corrosion and thinning.

[0032] Using the above structure, its operation process is as follows:

[0033] Slurry containing 22-46% phosphoric acid flows out from the lower liquid pipe of the flash chamber and enters the interior of the cross crusher through the first flange at the top of the cross crusher. At this time, the slurry carries vortices and bubbles due to the negative pressure of the flash chamber and needs to be treated by the cross crusher to stabilize the flow state.

[0034] Upon entering the cylinder, the slurry first contacts the first and second guide plates, which are perpendicular to each other and identical in size. The two guide plates are precisely engaged through the first and second grooves, and then welded together at the engagement point and on both sides to the inner wall of the cylinder to form an integral rigid structure. This double-fixed design prevents the guide plates from swaying under the high-frequency scouring of the slurry. At the same time, the plate thickness of more than 10mm and the corrosion resistance of 2507 stainless steel ensure long-term resistance to corrosion from phosphoric acid and fluoride ions in the slurry, as well as vortex impacts.

[0035] Under the action of the guide plate, the large vortex of the slurry is broken into smaller streams, and air bubbles escape and are eliminated as the flow stabilizes, resulting in a significant optimization of the flow pattern. The treated, stable slurry enters the axial flow pump through the second flange at the bottom of the cross-shaped crusher, avoiding pump cavitation caused by vortices and air bubbles. At the same time, the stable structure of the guide plate ensures the continuous and safe operation of the axial flow pump, ultimately guaranteeing the continuous operation of the Swensen phosphoric acid concentration system.

Claims

1. A cross-shaped breaker structure used in the Swensen phosphoric acid concentration process, characterized in that, The device includes a cross-shaped crushing cylinder (1), on the inner wall of which a first guide plate (2) and a second guide plate (3) are fixedly provided. The first guide plate (2) and the second guide plate (3) are arranged perpendicular to each other. The first guide plate (2) and the second guide plate (3) are exactly the same size. The top and bottom of the cross-shaped crushing cylinder (1) are fixedly provided with a first flange (4) and a second flange (5). The first flange (4) is connected to the liquid outlet of the flash chamber, and the second flange (5) is connected to the inlet of the axial flow pump.

2. The cross-shaped breaking structure for the Swensen phosphoric acid concentration process according to claim 1, characterized in that, The first guide plate (2) and the second guide plate (3) are welded and fixed to the inner wall of the cross-shaped crushing cylinder (1) on both sides.

3. The cross-shaped breaking structure for the Swensen phosphoric acid concentration process according to claim 1, characterized in that, The first guide plate (2) and the second guide plate (3) have a first groove (6) and a second groove (7) on one side. The first guide plate (2) and the second guide plate (3) are engaged with each other through the first groove (6) and the second groove (7). The length of the first groove (6) is half the length of the first guide plate (2), and the length of the second groove (7) is half the length of the second guide plate (3). The lengths of the first groove (6) and the second groove (7) are the same.

4. The cross-shaped breaking structure for the Swensen phosphoric acid concentration process according to claim 3, characterized in that, The connection between the first guide plate (2) and the second guide plate (3) is fixed by welding.

5. The cross-shaped breaking structure for the Swensen phosphoric acid concentration process according to claim 3, characterized in that, The thickness of the first guide plate (2) and the second guide plate (3) is at least 10 mm.

6. The cross-shaped breaking structure for the Swensen phosphoric acid concentration process according to claim 5, characterized in that, The width of the first groove (6) is the same as the thickness of the second guide plate (3), and the width of the second groove (7) is the same as the thickness of the first guide plate (2).

7. The cross-shaped breaking structure for the Swensen phosphoric acid concentration process according to claim 1, characterized in that, The first flange (4) and the second flange (5) are provided with a plurality of first flange bolt holes (8) and second flange bolt holes (9). The first flange (4) and the liquid pipe of the flash chamber are connected by bolts passing through the first flange bolt holes (8). The second flange (5) and the inlet of the axial flow pump are connected by bolts passing through the second flange bolt holes (9).

8. The cross-shaped breaking structure for the Swensen phosphoric acid concentration process according to claim 1, characterized in that, The cross-shaped crusher body (1), the first guide plate (2), the second guide plate (3), the first flange (4), and the second flange (5) are all made of 2507 stainless steel.

Images