Double-cavity multi-stage fluidized dryer

Abstract

The invention discloses a double-cavity multi-stage fluidized dryer. The double-cavity multi-stage fluidized dryer comprises a shell, a fence, a partition plate, a feeding pipe, a first-stage distribution plate, a partition plate and a second-stage distribution plate, an air outlet is formed in the top of the shell, a discharge port and a secondary air inlet are formed in the bottom of the shell, and a primary air inlet is formed in one side of the shell; the fence is arranged in the shell and communicates with the discharge port, and an opening is formed in the top of the fence; the partition plate is arranged between the fence and the inner wall of the shell and separates the fence from the inner wall of the shell; the feeding pipe extends into the shell from the top of the shell and extends to the partition plate; the first-stage distribution plate is arranged below the partition plate, and the first-stage distribution plate is arranged below the first-stage air inlet; the partition plate is arranged below the first-stage air inlet and divides the interior of the double-cavity multi-stage fluidized dryer into two cavities. And the secondary distribution plate is arranged on the fence. The double-cavity multi-stage fluidized dryer is small in size and higher in process adjustability, and the heat efficiency is greatly improved.

Description

Technical Field

[0001] The present invention relates to a dryer, in particular to a double-cavity multi-stage fluidized bed dryer, and more specifically to a polyolefin double-cavity multi-stage fluidized bed dryer. Background Art

[0002] The fluidized bed dryers used in existing polypropylene and other polyolefin industrial equipment are mostly single-layer fluidized bed fluidized bed dryers. The equipment is large in size and difficult to manufacture. The drying efficiency is low during use. At the same time, the control method is single, which cannot meet the stringent process control requirements of the high-end polyolefin drying process required by the current market.

[0003] At the same time, the single-layer structure has many lower limits in terms of equipment large-scale development and cannot meet the current development requirements of the industry. Summary of the Invention

[0004] The technical problem to be solved by the present invention is the low drying efficiency of a dryer with a single-layer fluidized bed.

[0005] In order to solve the above problems, the present invention provides a double-chamber multi-stage fluidized bed dryer, which includes: a shell, a fence, a partition, a feed pipe, a primary distribution plate, a partition plate and a secondary distribution plate; the top of the shell is provided with an air outlet, the bottom is provided with a discharge port and a secondary air inlet, and one side is provided with a primary air inlet; the fence is provided inside the shell and is connected to the discharge port, and the top of the fence is an opening; the partition plate is provided between the fence and the inner wall of the shell, and separates the fence from the inner wall of the shell; the feed pipe extends from the top of the shell into the interior of the shell and extends to the partition plate; the primary distribution plate is provided below the partition plate, and the primary distribution plate is provided above the primary air inlet; the partition plate is provided below the primary air inlet, and divides the interior of the double-chamber multi-stage fluidized bed dryer into two cavities; the secondary distribution plate is provided on the fence.

[0006] In one embodiment, the housing includes a lower cylinder and an enlarged section connected to the lower cylinder.

[0007] In one embodiment, the shell further includes an upper head and a lower head, the upper head is connected to the top of the expansion section, the lower head is connected to the bottom of the lower cylinder, the air outlet is provided on the upper head, and the material outlet is provided on the lower head.

[0008] In one embodiment, the primary distribution plate is an annular distribution plate composed of multiple conical distribution plates, and is further provided with an opening, and the shape of the opening is a tongue-shaped opening.

[0009] In one embodiment, the secondary distribution plate is conical in shape and is further provided with an opening, which is tongue-shaped.

[0010] In one embodiment, a temperature measuring port is provided between the partition plate and the primary distribution plate.

[0011] In one embodiment, a first-level exhaust port is provided between the first-level air inlet and the partition plate.

[0012] In one embodiment, supports are provided on both sides of the shell, and a viewing mirror is provided on the top of the shell.

[0013] In one embodiment, a secondary drain port is further provided at the bottom of the housing.

[0014] In one embodiment, one side of the shell is further provided with an inspection manhole I, an inspection manhole II and a pressure measuring port.

[0015] Compared with the prior art, the present invention has at least the following advantages:

[0016] 1. The partition plate of the present invention divides the dryer into two chambers. Through the dual-chamber multi-stage fluidization structure, the heat utilization rate in the fluidization process is greatly increased, and the process parameter adjustment capability is greater.

[0017] 2. The present invention adopts a multi-cavity structure, the equipment pressure is balanced, the equipment structure is light, the operation is stable, and the service life is increased.

[0018] 3. The present invention adopts a double-layer distributed fluidized structure, which can be adjusted independently, greatly improving the process adjustment performance. At the same time, multi-stage fluidized drying can ensure the drying effect and smooth discharge.

[0019] 4. A first-level drain port is provided on one side of the shell of the present invention. If some large particle materials cannot enter the fence during the primary fluidization process, they can be discharged through the first-level drain port to prevent the large particle materials from accumulating and clogging on the partition plate, thereby improving the operating stability of the equipment.

[0020] 5. The dual-chamber multi-stage fluidized bed dryer of the present invention has a compact structure, strong integrity and small footprint. Compared with the equipment of the prior art with the same processing capacity, it has a smaller volume, higher process adjustability and greatly improved thermal efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the double-cavity multi-stage fluidized bed dryer of the present invention.

[0022] Figure 2 This is a schematic diagram of the structure and openings of the primary distribution plate of the present invention.

[0023] Figure 3 It is a schematic diagram of the structure and openings of the secondary distribution plate of the present invention.

[0024] Wherein, the reference numerals:

[0025] Air outlet 1

[0026] Feed pipe 2

[0027] Upper head 3

[0028] Expanded section 4

[0029] Support 5

[0030] Lower cylinder 6

[0031] Partition 7

[0032] Temperature measuring port 8

[0033] Primary distribution board 9

[0034] First level air inlet 10

[0035] First level drain outlet 11

[0036] Lower head 12

[0037] Secondary exhaust port 13

[0038] Discharge port 14

[0039] Secondary distribution board 15

[0040] Secondary air inlet 16

[0041] Maintenance manhole Ⅰ17

[0042] Separator 18

[0043] Pressure port 19

[0044] Maintenance manhole Ⅱ20

[0045] Fence 21

[0046] Mirror 22 DETAILED DESCRIPTION

[0047] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0048] Figure 1 The double-chamber multi-stage fluidized bed dryer of the present invention comprises a housing, a fence 21 , a partition 7 , a feed pipe 2 , a primary distribution plate 9 , a partition plate 18 and a secondary distribution plate 15 .

[0049] The shell consists of an upper head 3, an expansion section 4, a lower cylinder 6 and a lower head 12. The upper head 3 covers the top of the expansion section 4, the lower cylinder 6 is connected to the bottom of the expansion section 4, and the lower head 12 is connected to the bottom of the lower cylinder 6. Supports 5 are also provided on both sides of the lower cylinder 6.

[0050] The upper head 3 is provided with an air outlet 1 for discharging the drying gas. The upper head 3 is also provided with a sight glass 22 for directly observing the flow state of the material inside the double-cavity multi-stage fluidized bed dryer.

[0051] The fence 21 is arranged inside the shell, and the top of the fence 21 is open. The fence 21 forms an inner cylinder for secondary drying of the material. The partition 7 is arranged between the fence 21 and the inner wall of the lower cylinder 6, and separates the fence 21 from the inner wall of the shell. The feed pipe 2 extends from the upper head 3 into the expansion section 4 and extends to the partition 7. More specifically, the bottom end of the feed pipe 2 extends to the internal space formed by the partition 7. The material enters from the feed pipe 2 and descends along one side of the partition 7. The partition 7 can ensure that the material entering from the feed pipe 2 is evenly distributed and flows in a certain direction. The extension of the feed pipe 2 to the partition 7 is conducive to the movement of the material along the airflow direction of the distribution plate, thereby improving the drying effect.

[0052] A primary distribution plate 9 is positioned below the partition 7. A primary air inlet 10 is located on one side of the lower cylinder 6. The primary distribution plate 9 is positioned above the primary air inlet 10, and a partition plate 18 is positioned below the primary air inlet 10. The partition plate 18 divides the interior of the dual-chamber multi-stage fluidized bed dryer into upper and lower chambers. The primary distribution plate 9 and secondary distribution plate 15 are located in each chamber, respectively, and are each equipped with a primary air inlet 10 and a secondary air inlet 16. The air inlet parameters of the primary and secondary air inlets 10 and 16 can be adjusted independently to ensure the equipment's operational requirements. Material fed from the feed pipe 2 descends along the partition 7 to the primary distribution plate 9. Primary air is introduced through the primary air inlet 10. As the primary air rises, it fully contacts the material on the primary distribution plate 9, dispersing the material. The material then ascends to the expansion section 4, where it undergoes initial drying. As the airflow decreases during this ascent, the material falls into the enclosure 21 under the influence of gravity.

[0053] The lower end cap 12 is provided with a discharge port 14 and a secondary air inlet 16. A fence 21 is connected to the discharge port 14, and a secondary distribution plate 15 is provided on the fence 21. Secondary drying gas is fed into the fence 21 through the secondary air inlet 16, where the material is secondary dried. The secondary distribution plate 15 prevents material from bridging during discharge and blocking the discharge port 14.

[0054] Both the primary distribution plate 9 and the secondary distribution plate 15 have a unique hole structure. The primary distribution plate 9 is an annular distribution plate composed of multiple conical distribution plates and is also provided with tongue-shaped openings. The secondary distribution plate 15 is conical in shape and also has tongue-shaped openings.

[0055] A temperature measuring port 8 is provided between the partition plate 7 and the first-level distribution plate 9 for detecting the temperature inside the double-cavity multi-stage fluidized bed dryer.

[0056] A first-level exhaust port 11 is provided between the first-level air inlet 10 and the partition plate 18. When some large particles in the first-level distribution plate 9 cannot be blown up by the first-level air inlet, these large particles can be discharged through the first-level exhaust port 11.

[0057] The lower head 12 is also provided with a secondary drain port 13. A small amount of material leaking from the secondary distribution plate 15 can be discharged through the secondary drain port 13; this structure can effectively improve the stability and reliability of the equipment operation.

[0058] One side of the lower cylinder 6 is also provided with an inspection manhole I 17 and an inspection manhole II 20 for operators to inspect and repair the equipment.

[0059] A pressure measuring port 19 is also provided on one side of the lower cylinder 6 for detecting the pressure inside the double-cavity multi-stage fluidized bed dryer.

[0060] During operation, material that has completed upstream processing enters the dual-chamber, multi-stage fluidized bed dryer through feed pipe 2 and into partition 7. The material then descends along one side of partition 7. Primary air is introduced through primary air inlet 10 and conveyed upward, either forward or tangentially, along the inner wall of lower cylinder 6. Upon reaching primary distribution plate 9, the material is dispersed by the primary air and rises under the influence of the primary air. During this ascent, the primary air fully contacts the material, providing initial drying. The material then ascends to expansion section 4. Due to the reduced gas velocity of the primary air in expansion section 4, the material falls under the influence of gravity into enclosure 21. There, the material descends and comes into contact with the secondary drying air blown out from secondary distribution plate 15, providing secondary drying. During the drying process, the material remains in a semi-fluid state within enclosure 21, allowing for smooth discharge and preventing bridging and blockage at discharge port 14. The air inlet process parameters of the first-level air inlet 10 and the second-level air inlet 16 are adjusted according to the quality status of the product at the discharge port to ensure that the discharge product is qualified.

[0061] When some large particles in the primary distribution plate 9 cannot be blown up by the primary air inlet, these large particles leak out through the primary distribution plate 9 and accumulate around the primary exhaust port 11, and then are discharged through the primary exhaust port 11. A small amount of material leaked from the secondary distribution plate 15 can be discharged through the secondary exhaust port 13; the design of this structure can effectively improve the stability and reliability of equipment operation.

[0062] Of course, the present invention may have many other embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art may make various corresponding changes and modifications based on the present invention, but these corresponding changes and modifications should all fall within the scope of protection of the claims attached to the present invention.

Claims

1. A dual-chamber multi-stage fluidized bed dryer, characterized in that: include: The housing is provided with an air outlet (1) at the top, a material outlet (14) and a secondary air inlet (16) at the bottom, and a primary air inlet (10) at one side; A fence (21) is provided inside the shell and communicated with the discharge port (14), and the top of the fence (21) is an opening; a partition (7) disposed between the fence (21) and the inner wall of the shell, and separating the fence (21) from the inner wall of the shell; A feed pipe (2) extends from the top of the shell into the interior of the shell and extends to the partition (7); A primary distribution plate (9) is provided below the partition plate (7), and the primary distribution plate (9) is provided above the primary air inlet (10); a partition plate (18) disposed below the primary air inlet (10) and dividing the interior of the dual-cavity multi-stage fluidized bed dryer into two cavities; as well as The secondary distribution plate (15) is arranged on the fence (21).

2. The dual-chamber multi-stage fluidized bed dryer according to claim 1, characterized in that: The shell comprises a lower cylinder (6) and an enlarged section (4) connected to the lower cylinder (6).

3. The dual-chamber multi-stage fluidized bed dryer according to claim 2, characterized in that: The shell further comprises an upper head (3) and a lower head (12), wherein the upper head (3) is connected to the top of the expansion section (4), and the lower head (12) is connected to the bottom of the lower cylinder (6), the air outlet (1) is provided on the upper head (3), and the material outlet (14) is provided on the lower head (12).

4. The dual-chamber multi-stage fluidized bed dryer according to claim 1, characterized in that: The primary distribution plate (9) is an annular distribution plate composed of multiple conical distribution plates, and is further provided with an opening, wherein the opening is in the shape of a tongue-shaped opening.

5. The dual-chamber multi-stage fluidized bed dryer according to claim 1, characterized in that: The secondary distribution plate (15) is conical in shape and is further provided with an opening, wherein the opening is tongue-shaped.

6. The dual-chamber multi-stage fluidized bed dryer according to claim 1, characterized in that: A temperature measuring port (8) is provided between the partition plate (7) and the primary distribution plate (9).

7. The dual-chamber multi-stage fluidized bed dryer according to claim 1, characterized in that: A first-level exhaust port (11) is provided between the first-level air inlet (10) and the partition plate (18).

8. The dual-chamber multi-stage fluidized bed dryer according to claim 1, characterized in that: Supports (5) are provided on both sides of the shell, and a viewing mirror (22) is provided on the top of the shell.

9. The dual-chamber multi-stage fluidized bed dryer according to claim 1, characterized in that: The bottom of the shell is also provided with a secondary drain port (13).

10. The dual-chamber multi-stage fluidized bed dryer according to claim 1, characterized in that: One side of the shell is also provided with an inspection manhole I (17), an inspection manhole II (20) and a pressure measuring port (19).

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