Solid particle gravity flow lock press device

Abstract

The present disclosure relates to a solid particle gravity conveying lock hopper device, comprising at least two structural units, and the structural units are connected in series two by two, each structural unit comprises a particle conveying area and a bypass area which are in communication with each other, the upper end of the particle conveying area is an inlet and the lower end is an outlet; the bypass area is free of solid particles and only has fluid flow, and the inlet and outlet of the bypass area are in communication with the particle conveying area, and the inlet of the bypass area is located below the outlet of the bypass area; the fluid comprises a first flow path and a second flow path, in the first flow path, the fluid flows from bottom to top in the particle conveying area and flows from the outlet of the particle conveying area to the inlet of the particle conveying area; in the second flow path, the fluid flows from the outlet of the particle conveying area to the inlet of the bypass area to flow in the bypass area, and the fluid flowing out of the outlet of the bypass area flows to the inlet of the particle conveying area. The lock hopper device can maintain the system pressure difference, reduce the gas flow, and reduce the equipment cost.

Description

Technical Field

[0001] This disclosure relates to the field of solid particle conveying equipment, and more specifically, to a solid particle gravity conveying and locking device. Background Technology

[0002] Modern chemical processes utilize solid catalysts to convert raw materials into products. During use, these catalysts slowly lose their activity and need to be transported to a regenerator for regeneration. Similar solid transport processes are involved in fields such as grain transportation, mineral sorting, and solid fuel power generation. Solid particle transport is a crucial issue in moving bed reactor systems and grain transport.

[0003] In most cases, solids are not in a vacuum but are surrounded by fluids. The pressure of the fluids can significantly affect the transport of solids. Solid transport often requires the continuous transfer of solids from low-pressure equipment to high-pressure equipment (reverse pressure differential transport). To solve the power problem of transporting solid particles against pressure differential, common technologies are divided into two main categories: powered mechanical transport technology and unpowered transport technology.

[0004] Powered machinery conveying technology utilizes powered machinery to move solid particles from low-pressure containers to high-pressure containers. However, because this technology involves moving parts, it can cause significant wear and tear on the solid particles, which should be avoided as much as possible in the conveying of catalysts in the chemical industry.

[0005] Non-powered conveying utilizes gravity to transport solid particles by causing them to fall from a low-pressure container to a high-pressure container (gravity conveying). In this method, due to the higher pressure in the lower container, fluid flows from the high-pressure container to the low-pressure container, and excessive flow can impede the fall of solid particles. Therefore, if known technology is used, relying solely on risers to maintain the pressure difference between the inlet and outlet, the maximum maintainable pressure difference, due to the interaction between the fluid and solid particles, is equal to the product of the particle bulk density, gravitational acceleration, and height in the riser. Both pressure difference and density are difficult to adjust for solid conveying; therefore, maintaining a large pressure difference requires increasing the height, which introduces difficulties in equipment design and layout.

[0006] To address this issue, the most common technique is to use a closed hopper, transforming the continuous conveying of solid particles into intermittent, batch conveying. However, this technique requires the valves to operate periodically. The periodic pressure fluctuations and the interaction between the valves and the solid particles can lead to particle breakage and wear. Furthermore, the periodic pressure increases and decreases in the equipment pose safety hazards.

[0007] In addition, the method of maintaining reverse pressure difference by using a combination of funnel, orifice plate and riser can achieve an effect several times that of riser pressure locking capacity. However, there is still catalyst flow at the orifice plate position, and the reduced diameter will bring the risk of solid particle blockage.

[0008] Therefore, the method of transporting solid particles with gravity and against pressure difference needs further improvement. Summary of the Invention

[0009] The purpose of this disclosure is to provide a gravity-fed solid particle conveying and locking device that can solve the technical problems in related technologies.

[0010] To achieve the above objectives, this disclosure provides a solid particle gravity conveying and locking device, which includes at least two structural units connected in series. Each structural unit includes a particle conveying area and a bypass area that are interconnected. The upper end of the particle conveying area is an inlet and the lower end is an outlet, and solid particles move from top to bottom within the particle conveying area. The bypass area contains no solid particles and only fluid flows, and both the inlet and outlet of the bypass area are connected to the particle conveying area, with the inlet of the bypass area located below the outlet of the bypass area.

[0011] The fluid includes a first flow path and a second flow path. In the first flow path, the fluid flows from bottom to top within the particle conveying zone and from the outlet of the particle conveying zone to the inlet of the particle conveying zone. In the second flow path, the fluid flows from the outlet of the particle conveying zone to the inlet of the bypass zone to flow into the bypass zone, and the fluid flowing out of the outlet of the bypass zone flows to the inlet of the particle conveying zone.

[0012] Optionally, in two adjacent structural units, the outlet of the particle conveying area of ​​one structural unit is connected to the inlet of the particle conveying area of ​​the other structural unit.

[0013] Optionally, the solid particle gravity conveying and locking device further includes a first filter and a second filter, wherein the first filter is disposed at the entrance of the bypass area and the second filter is disposed at the exit of the bypass area to prevent solid particles in the particle conveying area from entering the bypass area.

[0014] Optionally, the first filter element and the second filter element are constructed as a sieve mesh, and the size of the sieve mesh is smaller than the size of the solid particles.

[0015] Optionally, the sieve holes of the sieve mesh are elongated holes, the width of the elongated holes is between 0.5mm and 3mm, the length is between 200mm and 1500mm, and the opening rate of the elongated holes is between 30% and 70%.

[0016] Optionally, the number of the structural units is between 2 and 5000, and the structural units are connected in series in pairs.

[0017] Optionally, the equivalent diameter of the solid particles is between 0.3 mm and 5 mm, and the bulk density of the solid particles is 400–4500 kg / m³. 3 .

[0018] Optionally, the angle between the direction of fluid flowing out of the bypass zone and the flow direction of the fixed particles in the particle conveying zone is greater than or equal to 0° and less than 90°.

[0019] Optionally, the angle between the flow direction of the fluid flowing into the inlet of the bypass zone and the flow direction of the fixed particles in the particle conveying zone is greater than 90° and less than or equal to 180°.

[0020] Optionally, the solid particle gravity conveying and locking device further includes a first filter element, which is disposed at the entrance of the bypass area to prevent solid particles in the particle conveying area from entering the bypass area.

[0021] In the above technical solution, solid particles are conveyed using a particle conveying zone, and additional resistance is generated by changing the fluid flow direction using a bypass zone. This overcomes the concept that the riser pressure difference equals the product of the solid density and height, achieving strong locking capability at low heights without increasing solid particle wear. Compared with powered mechanical conveying and closed hopper conveying, this device has no moving machinery, resulting in less particle wear and improved equipment safety. Compared with funnel orifice plate riser combined conveying, the risk of blockage is reduced. Compared with riser conveying, the height is significantly reduced, decreasing equipment and structural investment. Furthermore, this locking device can maintain the system pressure difference and reduce gas flow.

[0022] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0023] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings:

[0024] Figure 1 This disclosure provides an embodiment of a gravity-fed solid particle conveying and locking device, wherein the bypass area is annular and located on both sides of the particle conveying area;

[0025] Figure 2 This disclosure provides one embodiment of a gravity-fed solid particle conveying and locking device, wherein a bypass area is located on one side of the particle conveying area;

[0026] Figure 3 This disclosure provides an embodiment of a gravity-fed solid particle conveying and locking device, wherein a bypass zone is located inside the particle conveying zone. Detailed Implementation

[0027] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0028] Reference Figures 1 to 3 As shown, this disclosure provides a solid particle gravity conveying and locking device, which includes at least two structural units 10, and the structural units 10 are connected in series in pairs. Each structural unit 10 includes a particle conveying zone 1 and a bypass zone 2 that are interconnected. The upper end of the particle conveying zone 1 is the inlet and the lower end is the outlet. Solid particles move from top to bottom in the particle conveying zone 1. There are no solid particles in the bypass zone 2 and only fluid flows. The inlet and outlet of the bypass zone 2 are both connected to the particle conveying zone 1, and the inlet of the bypass zone 2 is located below the outlet of the bypass zone 2.

[0029] The fluid includes a first flow path and a second flow path. In the first flow path, the fluid flows from bottom to top in the particle conveying zone 1 and flows from the outlet of the particle conveying zone 1 to the inlet of the particle conveying zone 1. In the second flow path, the fluid flows from the outlet of the particle conveying zone 1 to the inlet of the bypass zone 2 and flows into the bypass zone 2. The fluid flowing out from the outlet of the bypass zone 2 flows to the inlet of the particle conveying zone 1.

[0030] In the above technical solution, solid particles are conveyed using particle conveying zone 1, and additional resistance is generated by changing the fluid flow direction using bypass zone 2. This breaks through the concept that the riser pressure difference equals the product of solid density and height, achieving strong locking capability at low heights without increasing solid particle wear. Compared with powered mechanical conveying and closed hopper conveying, this device has no moving machinery, resulting in less particle wear and improved equipment safety. Compared with funnel orifice plate riser combined conveying, the risk of blockage is reduced. Compared with riser conveying, the height is significantly reduced, which can reduce equipment and structural investment. In addition, this locking device can maintain the system pressure difference and reduce gas flow.

[0031] Optionally, in two adjacent structural units 10, the outlet of the particle conveying zone 1 of one structural unit 10 is connected to the inlet of the particle conveying zone 1 of the other structural unit 10. This facilitates the flow of solid particles between the structural units 10.

[0032] In one embodiment, the gravity-fed solid particle conveying and locking device further includes a first filter element (not shown) and a second filter element (not shown). The first filter element is disposed at the inlet of the bypass zone 2, and the second filter element is disposed at the outlet of the bypass zone 2 to prevent solid particles in the particle conveying zone 1 from entering the bypass zone 2. For example, the first and second filter elements can be constructed as a mesh screen, and the size of the mesh openings is smaller than the size of the solid particles. The mesh openings can be elongated holes with a width between 0.5 mm and 3 mm, a length between 200 mm and 1500 mm, and an opening ratio between 30% and 70%.

[0033] In other embodiments, the number of structural units 10 is between 2 and 5000, and adjacent structural units 10 are connected in series. The number of structural units 10 can be set according to requirements. The equivalent diameter of the solid particles is between 0.3 mm and 5 mm, and the bulk density of the solid particles is 400–4500 kg / m³. 3 .

[0034] Optionally, the angle between the direction of fluid flow from the outlet of bypass zone 2 and the flow direction of stationary particles in particle conveying zone 1 is greater than or equal to 0° and less than 90°. This facilitates the inflow of fluid.

[0035] Optionally, the angle between the flow direction of the fluid flowing into the inlet of the bypass zone 2 and the flow direction of the fixed particles in the particle conveying zone 1 is greater than 90° and less than or equal to 180°, thereby facilitating the outflow of the fluid.

[0036] In other embodiments, the gravity-fed solid particle conveying and locking device further includes a first filter element, which is disposed at the inlet of the bypass zone 2 to prevent solid particles in the particle conveying zone 1 from entering the bypass zone 2. The outlet of the bypass zone may not have a filter element.

[0037] Example 1: Figure 1 The locking device with the structure shown

[0038] The locking device is a rotating body structure. Figure 1The diagram shows a cross-section at its central axis. Particle conveying zone 1 is a cylindrical area with a diameter of 97mm, and bypass zone 2 is a cylindrical area with a diameter of 200mm. Baffles and partitions are installed at 10mm intervals. Particles fall from top to bottom. The angle between the fluid inlet direction and the particle falling direction in bypass zone 2 is 160°, and the angle between the fluid outlet direction and the particle falling direction is 20°. There is no physical structural separation between bypass zone 2 and particle conveying zone 1. Structural unit 10 is 120mm long. A locking device consisting of 100 structural units connected in series has a height of 12m. When conveying particles with a diameter of 1.2mm and a density of 850kg / m³, it can convey solids under reverse pressure differential conditions, similar to the locking capacity of a 50m high riser, but only about one-quarter of that height. This reduces the frame height by approximately 38m, and the estimated frame investment can be reduced by approximately 5-10 million.

[0039] Example 2: Figure 2 The locking device with the structure shown

[0040] The locking device has a flat structure, and all flow sections are rectangular. Figure 2 The diagram shows its cross-section. The particle conveying zone 1 is 85mm wide, the bypass zone 2 is 20mm wide, and the flow channel is 300mm long. Structural unit 10 is 120mm long and 85mm thick. Particles fall from top to bottom. The angle between the fluid inlet direction and the particle falling direction in bypass zone 2 is 160°, and the angle between the fluid outlet direction and the particle falling direction is 0°. Bypass zone 2 and particle conveying zone 1 are separated by a screen. The screen is made of parallel metal strips welded to the inner structure of the support ring, with the metal strips spaced 1mm apart to isolate the catalyst particles. The total height of the locking structure formed by the 17 structural units 10 connected in series is 2040mm. When conveying particles with a diameter of 1.6mm and a density of 560kg / m³, it can convey solids under reverse pressure differential conditions, similar to the locking capacity of an 18m high riser, but only one-ninth the height, reducing frame investment by more than 50%.

[0041] Example 3: Figure 3 The locking device with the structure shown

[0042] The locking device is a tubular structure. Figure 3The cross-sectional view at its central axis shows that particle conveying zone 1 is a cylindrical area with a diameter of 150 mm. Internally, a bypass zone 2 with an inner diameter of 50 mm, a head diameter of 80 mm, and a length of 300 mm is supported by ribs. The angle between the fluid inlet direction and the particle movement direction in bypass zone 2 is 180°, and the angle between the fluid outlet direction and the bypass zone 2 is 0°. A screen with 2 mm diameter circular holes (60% opening rate) is installed at the inlet of bypass zone 2, and there is no physical separation at the outlet. Each structural unit is 500 mm long, and 20 structural units are connected in series (10 units). This allows for the conveying of particles with a diameter of 4 mm and a density of 1600 kg / m³ under reverse pressure differential conditions, equivalent to approximately a 40 m vertical pipe with a height of only 10 m. This reduces the investment in the equipment structural frame by approximately 70%.

[0043] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0044] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0045] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A solid particle gravity conveying and locking device, characterized in that, The solid particle gravity conveying and locking device includes at least two structural units connected in series. Each structural unit includes a particle conveying area and a bypass area that are interconnected. The upper end of the particle conveying area is the inlet and the lower end is the outlet. Solid particles move from top to bottom within the particle conveying area. The bypass area contains no solid particles and only fluid flows. The inlet and outlet of the bypass area are both connected to the particle conveying area, and the inlet of the bypass area is located below the outlet of the bypass area. The fluid includes a first flow path and a second flow path. In the first flow path, the fluid flows from bottom to top within the particle conveying zone and from the outlet of the particle conveying zone to the inlet of the particle conveying zone. In the second flow path, the fluid flows from the outlet of the particle conveying zone to the inlet of the bypass zone to flow into the bypass zone, and the fluid flowing out of the outlet of the bypass zone flows to the inlet of the particle conveying zone.

2. The solid particle gravity conveying and locking device according to claim 1, characterized in that, In two adjacent structural units, the outlet of the particle conveying area of ​​one structural unit is connected to the inlet of the particle conveying area of ​​the other structural unit.

3. The solid particle gravity conveying and locking device according to claim 1, characterized in that, The solid particle gravity conveying and locking device further includes a first filter and a second filter. The first filter is disposed at the entrance of the bypass area, and the second filter is disposed at the exit of the bypass area to prevent solid particles in the particle conveying area from entering the bypass area.

4. The solid particle gravity conveying and locking device according to claim 3, characterized in that, The first filter element and the second filter element are constructed as a sieve mesh, and the size of the sieve mesh is smaller than the size of the solid particles.

5. The solid particle gravity conveying and locking device according to claim 4, characterized in that, The sieve mesh has elongated holes with a width between 0.5mm and 3mm, a length between 200mm and 1500mm, and an opening rate between 30% and 70%.

6. The solid particle gravity conveying and locking device according to claim 1, characterized in that, The number of the structural units is between 2 and 5000, and the structural units that are adjacent to each other are connected in series.

7. The solid particle gravity conveying and locking device according to claim 1, characterized in that, The equivalent diameter of the solid particles is between 0.3 mm and 5 mm, and the bulk density of the solid particles is 400–4500 kg / m³. 3 .

8. The solid particle gravity conveying and locking device according to claim 1, characterized in that, The angle between the direction of fluid flowing out of the bypass zone and the flow direction of the fixed particles in the particle conveying zone is greater than or equal to 0° and less than 90°.

9. The solid particle gravity conveying and locking device according to claim 1, characterized in that, The angle between the flow direction of the fluid flowing into the inlet of the bypass zone and the flow direction of the fixed particles in the particle conveying zone is greater than 90° and less than or equal to 180°.

10. The solid particle gravity conveying and locking device according to claim 1, characterized in that, The solid particle gravity conveying and locking device further includes a first filter element, which is disposed at the entrance of the bypass area to prevent solid particles in the particle conveying area from entering the bypass area.

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