Double-cavity multi-stage fluidized dryer

Abstract

The utility model 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 utility model relates to a drier, in particular to a double-cavity multi-stage fluidized drier, and more specifically to a polyolefin double-cavity multi-stage fluidized drier. Background Art

[0002] The fluidized bed dryers used in existing polyolefin industrial equipment such as polypropylene 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 requirements for process control in the drying process of high-end polyolefins required by the current market.

[0003] At the same time, the single-layer structure has many lower limits in terms of equipment size and cannot meet the current development requirements of the industry. Utility Model Content

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

[0005] In order to solve the above problems, the utility model 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 shell is provided with an air outlet on the top, a material outlet and a secondary air inlet on the bottom, and a primary air inlet on one side; the fence is arranged inside the shell and is connected with the material outlet, and the top of the fence is an opening; 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 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 arranged below the partition plate, and the primary distribution plate is arranged above the primary air inlet; the partition plate is arranged 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 arranged 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 arranged on the upper head, and the material outlet is arranged on the lower head.

[0008] In one embodiment, the primary distribution plate is an annular distribution plate composed of a plurality of 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, and the opening 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 primary exhaust port is provided between the primary 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 shell.

[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 utility model has at least the following advantages:

[0016] 1. The partition plate of the utility model divides the dryer into two chambers. Through the double-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 utility model 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 utility model adopts a double-layer distributed fluidized structure, which can be adjusted independently, and the process adjustment performance is greatly improved. At the same time, multi-stage fluidized drying can ensure the drying effect and smooth discharge.

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

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

[0021] Figure 1 It is a schematic structural diagram of the double-chamber multi-stage fluidized bed dryer of the utility model.

[0022] Figure 2 The utility model is a schematic diagram of the structure and openings of the primary distribution plate.

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

[0024] Wherein, the reference numerals are:

[0025] Air outlet 1

[0026] Feed pipe 2

[0027] Upper head 3

[0028] Expanded segment 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] Divider 18

[0043] Pressure port 19

[0044] Maintenance manhole Ⅱ20

[0045] Fence 21

[0046] Mirror 22 DETAILED DESCRIPTION

[0047] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings.

[0048] Figure 1 The double-chamber multi-stage fluidized bed dryer of the utility model comprises a shell, 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, the lower head 12 is connected to the bottom of the lower cylinder 6, and supports 5 are also provided on both sides of the lower cylinder 6.

[0050] The upper end cap 3 is provided with an air outlet 1 for discharging the drying gas. The upper end cap 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 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 materials. 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] The primary distribution plate 9 is arranged below the partition 7, and a primary air inlet 10 is arranged on one side of the lower cylinder 6. The primary distribution plate 9 is arranged above the primary air inlet 10, and the partition plate 18 is arranged below the primary air inlet 10. The partition plate 18 divides the interior of the double-chamber multi-stage fluidized dryer into upper and lower chambers. The primary distribution plate 9 and the secondary distribution plate 15 are respectively arranged in the two chambers, and the primary air inlet 10 and the secondary air inlet 16 are respectively arranged. The air inlet parameters of the primary air inlet 10 and the secondary air inlet 16 can be adjusted separately to ensure the equipment operation process requirements. The material input from the feed pipe 2 descends along the partition 7 to the primary distribution plate 9, and the primary air inlet is input from the primary air inlet 10. The primary air inlet fully contacts the material on the primary distribution plate 9 during the rising process, and the material is dispersed under the action of the primary air inlet, and the material is initially dried when it rises to the expansion section 4. As the airflow becomes smaller during the rising process, the material falls into the fence 21 under the action 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. The secondary drying gas is input into the fence 21 through the secondary air inlet 16, and the material is secondary dried in the fence 21. The secondary distribution plate 15 can prevent the material from bridging during the discharge process and avoid blocking the discharge port 14.

[0054] The primary distribution plate 9 and the secondary distribution plate 15 both have special hole structures. The primary distribution plate 9 is an annular distribution plate composed of multiple conical distribution plates, and is also provided with an opening, and the shape of the opening is a tongue-shaped opening. The secondary distribution plate 15 is conical in shape and is also provided with an opening, and the shape of the opening is a tongue-shaped opening.

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

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

[0057] The lower end cap 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 a maintenance manhole Ⅰ17 and a maintenance manhole Ⅱ20 for operators to inspect 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-chamber multi-stage fluidized bed dryer.

[0060] During operation, the material that has been processed in the upstream process enters the double-chamber multi-stage fluidized dryer from the feed pipe 2 and enters the partition 7. The material continues to fall along one side of the partition 7. The primary air intake is input from the primary air inlet 10. The primary air intake is transported upward along the inner wall of the lower cylinder 6 in a positive or tangential direction. When it reaches the primary distribution plate 9, the material is dispersed under the action of the primary air intake. The material rises under the action of the primary air intake. During the rising process, the primary air intake fully contacts the material, and the material is initially dried. The material rises to the expansion section 4. Since the gas flow rate of the primary air intake in the expansion section 4 is reduced, the material falls into the fence 21 under the action of gravity. The material falls in the fence 21 and contacts the secondary drying gas blown out from the secondary distribution plate 15, and the material is dried twice. During the drying process, the material is always in a semi-fluid state in the fence 21. The material in the semi-fluid state can be discharged smoothly to avoid bridging and blockage at the discharge port 14. The air inlet process parameters of the primary air inlet 10 and the secondary air inlet 16 are adjusted according to the quality status of the product at the discharge port, so as 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 drain port 11, and then are discharged through the primary drain port 11. A small amount of material leaked from the secondary distribution plate 15 can be discharged through the secondary drain 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, technicians familiar with the field can make various corresponding changes and deformations based on the present invention, but these corresponding changes and deformations should all fall within the scope of protection of the claims attached to the present invention.

Claims

1. A double-chamber multi-stage fluidized bed dryer, characterized in that: include: The shell has 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 arranged 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 arranged below the partition plate (7), and the primary distribution plate (9) is arranged above the primary air inlet (10); A partition plate (18) is disposed below the primary air inlet (10) and divides the interior of the double-chamber multi-stage fluidized dryer into two chambers; as well as The secondary distribution plate (15) is arranged on the fence (21).

2. The double-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 double-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 arranged on the upper head (3), and the material outlet (14) is arranged on the lower head (12).

4. The double-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 a plurality of conical distribution plates, and is also provided with an opening, wherein the opening is in the shape of a tongue-shaped opening.

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

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

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

9. The double-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 double-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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