Efficient separation and recovery device for polypropylene fine powder
By designing a separation device for anti-impact baffle and a baffle baffle in the polypropylene production process, combining the powder collector and spraying device, efficient separation and recycling of polypropylene fine powder is achieved, solving the problems of low separation efficiency and high sewage treatment pressure in the prior art, and achieving the effect of zero water replenishment and zero emission.
Patent Information
- Application Number
- CN202422388466.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-29
- Publication Date
- 2025-07-22
- Estimated Expiration
- 2034-09-29
AI Technical Summary
In the prior art, it is difficult to efficiently separate the polypropylene fine powder in the overflow water of the drying gas scrubber, resulting in low drainage compliance rate outside the device and large amount of desalination water, which increases sewage treatment pressure and polypropylene loss.
A highly efficient separation and recovery device for polypropylene fine powder is designed. By setting an anti-impact baffle and the first diversion baffle in the separation device for preliminary separation, the baffle baffle is used to extend the residence time of nitrogen, and a gas-solid and liquid separation is performed in combination with the powder collector and the filter water tank. The polypropylene fine powder in the nitrogen is deposited and separated under the action of gravity. The polypropylene fine powder on the water surface is collected and recovered. The spraying device washes the particulate matter in the nitrogen to ensure that the discharged water quality meets the standards.
The efficient separation and recycling of polypropylene fine powder has been achieved, the amount of sewage discharged outside the device has been reduced, the use of desalinated water is reduced, the downstream sewage treatment pressure has been reduced, and the goal of zero water replenishment and zero emission has been basically achieved. The polypropylene fine powder can be recycled as a product.
Smart Images
Figure CN223127497U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the field of polypropylene production, and in particular relates to a device for efficiently separating and recovering polypropylene fine powder. Background Art
[0002] The polypropylene powder generated in the loop reactor is flash-recovered and steam-treated, and then dried by circulating hot nitrogen. After the hot nitrogen removes the moisture (about 3% wt) in the powder in the dryer, it enters the dry gas washing tower T502 through the cyclone separator, contacts the washing water in reverse, removes the fine powder and moisture carried by the nitrogen, and is sent to the heater by the fan for heating before returning to the dryer. After the washing water in the dry gas washing tower T502 contacts the nitrogen, it carries a lot of polypropylene fine powder. In order to discharge this part of fine powder, it is necessary to increase the water replenishment of the washing water of the dry gas washing tower T502 so that the polypropylene fine powder flows out with the overflow water and is discharged into the ditch. The water replenishment of the dry gas washing tower T502 is about 3.5t / h, and the water replenishment can reach 10t / h during the regular weekly washing operation.
[0003] The original operation process of the dry gas washing tower T502 system is: through fresh water replenishment, the overflow water of the dry gas washing tower T502 will make the fine powder carried in the washing water flow out of the dry gas washing tower T502, flow into the well and ditch of the device, and then enter the wastewater collection pool, and be sent to the sewage treatment plant for treatment by a self-priming pump. During the operation, the washing water replenishment of the dry gas washing tower T502 not only increases the loss of desalted water in the device, but also the carried polypropylene fine powder is discharged with the water, which increases the loss of polypropylene, affects the compliance rate of the device's external drainage, and the sewage treatment pressure is high. Therefore, there is an urgent need for a polypropylene device fine powder efficient separation and recovery device that can efficiently recover the polypropylene fine powder contained in the washing water, and continue to send the treated overflow water back to the dry gas washing tower T502 for use, which greatly reduces the use of desalted water and reduces the water consumption of the device. Utility Model Content
[0004] The utility model aims to provide a polypropylene fine powder efficient separation and recovery device to overcome the shortcomings of the prior art of low efficiency in separating polypropylene fine powder, low compliance rate of drainage outside the device, and high usage of desalted water.
[0005] In order to achieve the above object, the utility model provides the following technical solutions:
[0006] It includes a separation device and an exhaust stack; the exhaust stack is arranged above the separation device. One side of the separation device is connected to a water inlet, and the bottom of the separation device is connected to a filtration water tank. A powder collector is arranged in the middle of the filtration water tank; the bottom of the separation device is connected to the filtration water tank, and a powder collector is arranged in the middle of the filtration water tank; the separation device includes an anti - impact baffle, which is arranged at the water inlet, and a first diversion baffle is arranged below the anti - impact baffle; multiple baffle plates are arranged in the exhaust stack from top to bottom; the anti - impact baffle and the first diversion baffle inside the separation device are used to separate the overflow water entering into a mixture of nitrogen, water and polypropylene fine powder. Nitrogen, due to its small density and large buoyancy, moves upward to the exhaust stack; while the mixture of water and polypropylene fine powder flows downward to the filtration water tank due to gravity. The mixture of water and polypropylene fine powder passes through the second diversion baffle and flows up and down. Due to the large flow - through area, the flow rate is reduced, and the polypropylene fine powder is separated from water by the density difference and floats on the water surface; the powder collector is used to collect the polypropylene fine powder floating on the water surface, and the powder collector allows water to pass through while blocking the polypropylene fine powder. The collected fine powder can be cleaned regularly and recycled. The function of the baffle plate is to prevent the climbing effect of the nitrogen on the wall of the stack, increase the separation of the polypropylene fine powder foam entrained by nitrogen, and the polypropylene fine powder foam entrained in nitrogen is washed by spray water again, so that the nitrogen particulate matter discharged into the atmosphere meets the standards, thereby further improving the sedimentation efficiency of the polypropylene fine powder particles that may be carried in nitrogen.
[0007] Further, a filter screen is arranged on the right side of the powder collector. The aperture of the filter screen is selected according to the particle size distribution of the polypropylene fine powder, which should not only ensure that the polypropylene fine powder can be effectively blocked, but also avoid too large resistance affecting the water flow through, and prevent the uncollected polypropylene fine powder from entering the other side of the filtration water tank.
[0008] Further, a water baffle is arranged on the right side of the filter screen. The height of the water baffle is lower than the water surface and higher than the second diversion baffle, which is used to control the liquid level, ensure that the water passing through does not contain polypropylene fine powder, the passing - rate of the water discharged from the filtration water tank is high, and reduce the sewage treatment pressure.
[0009] Further, the powder collector includes a cylinder assembly. One end of the cylinder assembly is fixed inside the powder collector, and the other end is connected to a telescopic hanging basket; through the cooperation of the cylinder assembly and the telescopic hanging basket, the telescopic hanging basket can move up and down inside the water tank, which is convenient for salvaging the polypropylene fine powder; a screen is arranged at the bottom of the telescopic hanging basket, which is used to block the polypropylene fine powder from entering the hanging basket while allowing water to pass through. When the telescopic hanging basket is lifted out of the water, the polypropylene fine powder will be left in the telescopic hanging basket while the water flows out.
[0010] Further, a rain - proof cap is arranged at the top of the exhaust stack, and the rain - proof cap is mainly used to prevent rainwater or other external moisture from entering the inside of the exhaust stack.
[0011] Further, a spray device is provided above the baffle plate inside the exhaust pipe. The spray device sprays water mist. The presence of multiple baffle plates causes nitrogen to form a tortuous flow path inside the exhaust pipe, which helps the nitrogen to mix and contact more fully with the water mist sprayed by the spray device, and can wash away some polypropylene fine powder particles in the nitrogen. The spray device can also regularly clean the surface of the baffle plate and the inner wall of the exhaust pipe to prevent the polypropylene fine powder particles in the nitrogen from depositing and blocking at these parts.
[0012] Further, the exhaust pipe and the separation device are connected by a first square interface flange, and the separation device and the filter water tank are connected by a second square interface flange.
[0013] Further, a discharge port is provided at the right bottom of the filter water tank to allow relatively clean water to flow out from the bottom of the filter water tank.
[0014] Further, a bottom support is provided below the filter water tank.
[0015] Further, a square manhole is provided on one side of the filter water tank.
[0016] Compared with the prior art, the utility model has the following beneficial technical effects:
[0017] The utility model provides a device for efficiently separating and recovering polypropylene fine powder. By arranging an anti-impact baffle and a first shunt baffle in the separation device, the incoming overflow water is preliminarily separated into a mixture of nitrogen, water and polypropylene fine powder. The nitrogen moves upward to the exhaust pipe. By arranging a plurality of baffle plates from top to bottom inside the exhaust pipe, the nitrogen forms a tortuous flow path inside the exhaust pipe, prolonging the residence time of the nitrogen, enabling the polypropylene fine powder particles that may be carried therein to be deposited and separated under the action of gravity, and also enhancing the contact area between the nitrogen and the baffle plates, improving the purification efficiency. By arranging a second shunt baffle in front of the powder collector inside the filter water tank, the water and polypropylene fine powder mixture passes through the second shunt baffle and flows up and down. Due to the large flow area, the flow rate is low, and the polypropylene fine powder and water are separated and float on the water surface. The polypropylene fine powder is collected by the arranged powder collector. The utility model can separate gas, solid and liquid from the overflow water, enable the polypropylene fine powder to be separated and salvaged, discharge nitrogen from the exhaust pipe, discharge water with qualified particulate matter, have high efficiency in separating and collecting polypropylene fine powder, greatly reduce the overall external sewage discharge of the device, effectively reduce the downstream sewage treatment pressure, pump it back to the dry gas scrubbing tower T502 as makeup water for repeated use, and reduce the discharge of polypropylene fine powder. The polypropylene fine powder can also be recovered as a product, and basically can achieve the goal of "zero makeup water and zero discharge".
[0018] Specifically, a filter screen is provided on the right side of the powder collector, and a water baffle is provided on the right side of the filter screen. The height of the water baffle is lower than the water surface and higher than the second diversion baffle. The filter screen can effectively block the polypropylene fine powder, preventing the uncollected polypropylene fine powder from entering the other side of the filter water tank. The setting of the water baffle becomes the last barrier before the water outlet, effectively blocking the path of the fine powder from entering the discharge port. This makes the water quality discharged from the filter water tank clearer, with an extremely low content of polypropylene fine powder, even meeting the zero-discharge standard, greatly reducing the burden and cost of the subsequent sewage treatment process. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 FIG. 1 is a front schematic view of a high-efficiency separation and recovery device for polypropylene fine powder in Embodiment 1 of the present invention.
[0020] Figure 2 FIG. 2 is a right schematic view of a high-efficiency separation and recovery device for polypropylene fine powder in an embodiment of the present invention.
[0021] Figure 3 FIG. 3 is a front schematic view of a high-efficiency separation and recovery device for polypropylene fine powder in Embodiment 2 of the present invention.
[0022] In the figures, 1, filter water tank; 2, bottom support; 3, exhaust pipe; 4, baffle; 5, rain cap; 6, cylinder assembly; 7, spraying device; 8, water inlet; 9, square manhole; 10, anti-scour baffle; 11, first diversion baffle; 12, first square interface; 13, powder collector; 14, telescopic hanging basket; 15, water baffle; 16, discharge port; 17, second diversion baffle; 18, filter screen; 19, first square interface DETAILED DESCRIPTION OF THE EMBODIMENTS
[0023] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
[0024] It should be noted that the terms "first", "second", etc. in the description, claims and the above-mentioned drawings of the present utility model are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present utility model described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or are inherent to these processes, methods, products or devices.
[0025] The present utility model provides a device for efficiently separating and recovering polypropylene fine powder, which can separate the overflow water into gas, solid and liquid states, so that the polypropylene fine powder can be separated and salvaged and collected. Nitrogen is discharged from the exhaust cylinder, and the water with qualified discharged particulate matter. The efficiency of separating and collecting polypropylene fine powder is high, the overall external sewage discharge of the device is greatly reduced, the downstream sewage treatment pressure is effectively reduced, and the discharged water can be reused. The salvaged polypropylene fine powder can also be recycled as a product, and the goal of "zero makeup water and zero discharge" can be basically achieved.
[0026] Embodiment 1
[0027] Refer to Figures 1 to 2 , a device for efficiently separating and recovering polypropylene fine powder, comprising a separation device and an exhaust cylinder 3; the exhaust cylinder 3 is arranged above the separation device, one side of the separation device is connected with a water inlet 8, the separation device separates the nitrogen, water and polypropylene fine powder mixture in the incoming overflow water, and the exhaust cylinder 3 performs secondary gas-solid separation on the separated nitrogen; the bottom of the separation device is connected with a filter water tank 1, a powder collector 13 is arranged in the middle of the filter water tank 1, the powder collector 13 includes a cylinder assembly 6, one end of the cylinder assembly 6 is fixed inside the powder collector 13, and the other end is connected with a telescopic hanging basket 14. A screen is arranged at the bottom of the telescopic hanging basket 14, and the powder collector 13 controls the telescopic hanging basket 14 to move up and down on the water surface in the filter water tank 1 through the cylinder assembly 6 to salvage the polypropylene fine powder floating on the water surface.
[0028] The separation device includes an impact protection baffle 10, which is arranged at the water inlet 8. A first diversion baffle 11 is arranged below the impact protection baffle 10. The first diversion baffle 11 separates the incoming overflow water to separate nitrogen, water and polypropylene fine powder mixture. Inside the filter water tank 1, a second diversion baffle 17 is arranged in front of the powder collector 13. The second diversion baffle 17 separates the water and polypropylene fine powder mixture, making the polypropylene fine powder float on the water surface for convenient salvage and collection. Inside the exhaust pipe 3, a plurality of baffle plates 4 are arranged from top to bottom. The function of the baffle plates 4 is to slow down the rising speed of nitrogen and increase the residence time of nitrogen in the exhaust pipe, so as to further improve the sedimentation efficiency of polypropylene fine powder particles that may be carried in nitrogen. A filter screen 18 is arranged on the right side of the powder collector 13. The filter screen 18 prevents uncollected polypropylene fine powder from entering the other side of the filter water tank. The filter screen 18 is composed of multiple layers of filter cloth.
[0029] A rain cap 5 is arranged at the top of the exhaust pipe 3. The exhaust pipe 3 and the separation device are flange-connected through a first square interface 12. The separation device and the filter water tank 1 are flange-connected through a second square interface 19. A discharge port 16 is arranged at the bottom right of the filter water tank 1. A square manhole 9 is arranged on one side of the filter water tank 1. A bottom support 2 is arranged below the filter water tank 1.
[0030] Embodiment 2
[0031] Refer to Figure 2 、 Figure 3 Based on Embodiment 1, a water baffle 15 is arranged on the right side of the filter screen 18. The height of the water baffle 15 is lower than the water surface and higher than the second diversion baffle 17. The water baffle 15 controls the liquid level to ensure that the passing water does not contain polypropylene fine powder, and the passing rate of the water discharged from the filter water tank 1 is high, reducing the sewage treatment pressure. Above the baffle plates 4 inside the exhaust pipe 3, a spraying device 7 is arranged. The spraying device 7 sprays water mist. The presence of multiple baffle plates 4 makes nitrogen form a tortuous flow path inside the exhaust pipe, which helps nitrogen to mix and contact more fully with the water mist sprayed by the spraying device 7, and can wash away some polypropylene fine powder particles in nitrogen. The spraying device 7 can also regularly clean the surface of the baffle plates 4 and the inner wall of the exhaust pipe 3 to prevent polypropylene fine powder particles in nitrogen from depositing and blocking at these parts.
[0032] Working process:
[0033] During operation, the control cylinder assembly 6 lowers the telescopic hanging basket 14 underwater. The overflow water flows into the separation device from the water inlet 8 and is separated under the action of the first diversion baffle 11 provided inside the separation device. Nitrogen is discharged from the exhaust cylinder 3 and passes through a plurality of baffle plates 4 provided in the exhaust cylinder 3, which prolongs the residence time of the nitrogen, enabling the polypropylene fine powder particles that may be carried therein to deposit and separate under the action of gravity. The water and polypropylene fine powder mixture flows up and down through the second diversion baffle 17. Due to the large flow area, the flow rate is relatively low, and the polypropylene fine powder and water are separated and float on the water surface. After a certain amount of polypropylene fine powder accumulates on the water surface, the control cylinder assembly 6 raises the telescopic hanging basket 14. The polypropylene fine powder is collected by the screen provided at the bottom of the telescopic hanging basket 14, and then the polypropylene fine powder is collected by the scraping net. The water that is relatively clean after being separated from the polypropylene fine powder is screened again through the filter net 18 to prevent any missed polypropylene fine powder. The relatively clean water passing through the filter net 18 flows out from the discharge port 16 after passing through the water baffle 15.
[0034] The above is only a preferred embodiment of the present invention, and does not impose any form of limitation on the present invention. Any person skilled in the art of this industry can smoothly implement the present invention according to the illustrations in the specification and the above description. However, any equivalent changes such as minor modifications, decorations, and evolutions made by those skilled in the art within the scope of the technical solution of the present invention by using the technical content disclosed above are equivalent embodiments of the present invention. At the same time, any equivalent changes, modifications, and evolutions made to the above embodiments based on the essence of the present invention still fall within the protection scope of the technical solution of the present invention.
Claims
1. An efficient separation and recovery device for polypropylene fine powder, characterized in that, It includes a separation device and a flue gas exhaust stack (3); the exhaust stack (3) is arranged above the separation device, a water inlet (8) is connected to one side of the separation device, the bottom of the separation device is connected to a filtering water tank (1), and a powder collector (13) is arranged in the middle of the filtering water tank (1); the separation device includes an impact-proof baffle (10), the impact-proof baffle (10) is arranged at the water inlet (8), a first diversion baffle (11) is arranged below the impact-proof baffle (10), and a second diversion baffle (17) is arranged in front of the powder collector (13) inside the filtering water tank (1); a plurality of baffle plates (4) are arranged in the exhaust stack (3) from top to bottom.
2. The high-efficiency separation and recovery device for polypropylene fine powder according to claim 1, characterized in that, A filter screen (18) is arranged on the right side of the powder collector (13).
3. The high-efficiency separation and recovery device for polypropylene fine powder according to claim 2, characterized in that, A water baffle (15) is arranged on the right side of the filter screen (18), and the height of the water baffle (15) is lower than the water surface and higher than the second diversion baffle (17).
4. The high-efficiency separation and recovery device for polypropylene fine powder according to claim 1, wherein The powder collector (13) includes a cylinder assembly (6), one end of the cylinder assembly (6) is fixed inside the powder collector (13), the other end is connected to a telescopic hanging basket (14), and a screen is arranged at the bottom of the telescopic hanging basket (14).
5. An efficient separation and recovery device for polypropylene fine powder according to claim 1, characterized in that, A rain-proof cap (5) is arranged at the top of the exhaust stack (3).
6. The high-efficiency separation and recovery device for polypropylene fine powder according to claim 5, wherein, A spraying device (7) is arranged above the baffle plate (4) inside the exhaust stack (3).
7. An efficient separation and recovery device for polypropylene fine powder according to claim 1, characterized in that, The exhaust stack (3) and the separation device are flange-connected through a first square interface (12), and the separation device and the filtering water tank (1) are flange-connected through a second square interface (19).
8. The high-efficiency separation and recovery device for polypropylene fine powder according to claim 1, characterized in that, A discharge port (16) is arranged at the bottom right side of the filtering water tank (1).
9. An efficient separation and recovery device for polypropylene fine powder according to claim 1, characterized in that, A square manhole (9) is arranged on one side of the filtering water tank (1).
10. The high-efficiency separation and recovery device for polypropylene fine powder according to claim 1, characterized in that, Bottom supports (2) are arranged below the filtering water tank (1).