A device for separating a liquid containing polypropylene particles

Abstract

The present application relates to a kind of separation device of polypropylene particle-containing liquid, comprising: liquid storage tank, the baffle is arranged in the liquid storage tank, the height of the baffle is less than the height of liquid storage tank, and the liquid storage tank is separated into clean water chamber and dust-containing water chamber;Dust-containing water outlet is arranged below the dust-containing water chamber, and the first clean water outlet is arranged below the clean water chamber.Utilize the characteristics that the dust and other impurities contained in process fluid are less than process fluid, float on the surface of fluid to realize fluid filtration.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of solid-liquid separation in polyolefin industry, and particularly relates to a separation device for liquid containing polypropylene particles. BACKGROUND

[0002] A large amount of fine powder is generated in the underwater pelletizing process of polypropylene. The fine powder enters the pelletizing water and circulates in the system with the pelletizing water. In order to prevent the fine powder from accumulating in the system and affecting the normal operation of downstream equipment such as coolers, a filtering device needs to be added before entering the cooler to filter and remove the fine powder. In China, a curved screen is generally used as a separation device. The device is used in one open and one standby mode, occupies a large area, and the screen needs to be cleaned and replaced regularly. SUMMARY

[0003] The present application provides a separation device for liquid containing polypropylene particles to solve the problems of large equipment footprint, regular maintenance and inconvenient operation in the prior art.

[0004] To achieve the above-mentioned purpose, the present application provides a separation device for liquid containing polypropylene particles, comprising: a liquid storage tank, a partition plate is arranged in the liquid storage tank, the height of the partition plate is less than the height of the liquid storage tank, and the liquid storage tank is divided into a clean water chamber and a dust-containing water chamber; a dust-containing water outlet is arranged below the dust-containing water chamber, and a first clean water outlet is arranged below the clean water chamber.

[0005] The separation device for liquid containing polypropylene particles, wherein a heat exchanger is further arranged below the clean water chamber, and the clean water chamber and the heat exchanger are connected through a downcomer.

[0006] The separation device for liquid containing polypropylene particles, wherein a lower tube box is arranged below the heat exchanger.

[0007] The separation device for liquid containing polypropylene particles, wherein two liquid level meters are arranged on the dust-containing water chamber, a dust-containing water drainage pipeline is connected to the dust-containing water outlet, and a valve is arranged on the dust-containing water drainage pipeline.

[0008] The separation device for liquid containing polypropylene particles, wherein liquid level meters are arranged on the clean water chamber and the downcomer.

[0009] The separation device for liquid containing polypropylene particles, wherein an upper head is arranged on the liquid storage tank, and a dust-containing water inlet is arranged on the upper head at a position corresponding to the clean water chamber.

[0010] The separation device for liquid containing polypropylene particles, wherein the heat exchanger is a shell-and-tube heat exchanger, and a heat medium inlet, a heat medium outlet, a purge port and a vent port are arranged on the shell side.

[0011] The present application has the following advantages:

[0012] The impurities such as dust contained in the process fluid are less dense than the process fluid, and float on the surface of the fluid, so that the fluid is filtered, a heat exchanger is arranged below the water purification chamber, and the filtered cooling or the filtered heating can be completed in one device. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 The structure diagram of the separation device for the liquid containing polypropylene particles is shown in the figure.

[0014] Figure 2 The process flow chart of the polypropylene particle filtering and cooling integrated technology is shown in the figure.

[0015] Figure 3 The process flow chart of the polypropylene particle filtering and heating integrated technology is shown in the figure.

[0016] In the figure, the reference signs are as follows:

[0017] 1 liquid storage tank;

[0018] 2 partition plate;

[0019] 3 water purification chamber;

[0020] 4 dust-containing water chamber;

[0021] 5 dust-containing water outlet;

[0022] 6 heat exchanger;

[0023] 7 liquid lowering pipe;

[0024] 8 lower pipe box;

[0025] 9 second clean water outlet;

[0026] 10 temperature gauge interface;

[0027] 11-1, 11-2, 11-3, 11-4 liquid level meter;

[0028] 12 dust-containing water drainage pipeline;

[0029] 13 upper head;

[0030] 14 dust-containing water inlet;

[0031] 15 heat exchange medium inlet and outlet one;

[0032] 16 heat exchange medium inlet and outlet two;

[0033] 17 clean water outlet;

[0034] 18 vent port;

[0035] 19 conveying pump;

[0036] 20 lug. DETAILED DESCRIPTION

[0037] The application will be described in detail below by examples. It is necessary to point out here that the following examples are only used to further illustrate the application and cannot be understood as limiting the protection scope of the application, and those skilled in the art can make some non-essential improvements and adjustments to the application according to the above content of the application.

[0038] Please refer to Figure 1 The separation device for the liquid containing polypropylene particles comprises a liquid storage tank 1, a partition plate 2 is arranged in the liquid storage tank 1, and the partition plate 2 separates the liquid storage tank 1 into a clean water chamber 3 and a dust-containing water chamber 4; a dust-containing water outlet 5 is arranged below the dust-containing water chamber 4, and a first clean water outlet is arranged below the clean water chamber 3.

[0039] The height of the partition plate 2 is less than the height of the liquid storage tank 1, so that the top of the adjacent clean water chamber 3 and dust-containing water chamber 4 is communicated. During the treatment process, the dust-containing liquid first flows into the clean water chamber 3. Since the density of the polypropylene particles in the liquid containing polypropylene particles is less than the density of the liquid, the polypropylene particles float on the surface of the liquid. When the liquid level gradually rises to the height of the partition plate 2, the liquid containing polypropylene particles in the upper layer flows into the dust-containing water chamber 4, so as to realize the separation of the polypropylene particles and the liquid. The concentrated polypropylene particle waste liquid in the dust-containing water chamber 4 can be discharged through the dust-containing water outlet 5, and the liquid from which the polypropylene particles are removed is discharged through the first clean water outlet.

[0040] As a preferred embodiment, a heat exchanger 6 is further arranged below the clean water chamber 3, and the clean water chamber 3 and the heat exchanger 6 are connected through a downcomer 7. The downcomer 7 should have a certain height, so as to increase the buoyancy of the fine powder and prevent the fine powder from being brought into the heat exchanger when the fluid enters the clean water chamber.

[0041] As a preferred embodiment, a lower pipe box 8 is arranged below the heat exchanger 6, and a second clean water outlet 9 and a thermometer interface 10 are arranged on the lower pipe box 8. The thermometer interface 10 can be provided with a temperature detection instrument, and the temperature of the purified water is kept to meet the process requirements through the control of the adjusting valve on the pipeline.

[0042] Please refer to Figure 1 and Figure 2 As a preferred embodiment, upper and lower liquid level meters 11-1 and 11-2 are arranged on the dust-containing water chamber 4, the dust-containing water outlet 5 is connected with a dust-containing water drainage pipeline 12, and a valve is arranged on the dust-containing water drainage pipeline 12. When the dust-containing water in the dust-containing water chamber 4 accumulates to a high liquid level, the two-position valve on the dust-containing water drainage pipeline 12 is opened to discharge the dust-containing water from the equipment; when the water level reaches a low liquid level, the two-position valve on the dust-containing water drainage pipeline 12 is closed.

[0043] As a preferred embodiment, liquid level meters 11-3 and 11-4 are respectively arranged on the water purification chamber 3 and the downcomer 7. The water level in the storage tank 1 is kept at a normal level by controlling the regulating valve on the water purification discharge pipeline through the liquid level meter 11-3 on the water purification chamber 3.

[0044] As a preferred embodiment, the storage tank 1 is provided with an upper head 13, and the upper head 13 is provided with a dust-containing water inlet 14 at a position corresponding to the water purification chamber 3.

[0045] Please refer to Figure 1 , Figure 2 and Figure 3 As a preferred embodiment, the heat exchanger 6 is a shell-and-tube heat exchanger, and the shell side is provided with a heat exchange medium inlet 15, a heat exchange medium outlet 16, a discharge port 17 and a vent port 18. The water in the water purification chamber 3 flows from top to bottom through the tube side of the heat exchanger 6 for heat exchange to the required temperature, and then is discharged to the water use point according to the need by gravity flow or by a delivery pump 19. The heat exchange medium can be a cooling medium such as circulating cooling water, low-temperature water, chilled brine, etc., or a heating medium such as hot water, steam, etc., for heating the purified water. During heat exchange, if the heat exchange medium is a cooling medium, the heat exchange medium enters the heat exchanger 6 from the heat exchange medium inlet 15 and flows out of the heat exchanger 6 from the heat exchange medium outlet 16; if the heat exchange medium is a heating medium, the heat exchange medium enters the heat exchanger 6 from the heat exchange medium outlet 16 and flows out of the heat exchanger 6 from the heat exchange medium inlet 15; the delivery pump 19 can be a centrifugal pump, a positive displacement pump or other forms of pump.

[0046] As a preferred embodiment, the storage tank side wall can also be provided with an ear 20 for fixing the separation device.

[0047] Of course, the present application can have other various embodiments, and those skilled in the art can make various corresponding changes and modifications according to the present application without departing from the spirit and essence of the present application, but these corresponding changes and modifications should all belong to the protection scope of the claims of the present application.

Claims

1. A device for separating a liquid containing polypropylene particles, characterized in that The application relates to a dust-containing water tank and a clean water tank. The dust-containing water tank is provided with a dust-containing water outlet at the lower part, and the clean water tank is provided with a first clean water outlet at the lower part. The clean water tank is further provided with a heat exchanger at the lower part, and the clean water tank and the heat exchanger are connected through a downcomer. The dust-containing water tank is provided with upper and lower liquid level meters, and the dust-containing water outlet is connected with a dust-containing water drainage pipeline which is provided with a valve. The downcomer has a certain height, so that the fine powder buoyancy is increased, and the fine powder is prevented from entering the heat exchanger when the fluid enters the clean water tank.

2. The polypropylene-containing particle-in-liquid separation apparatus of claim 1, wherein, The heat exchanger is provided with a lower tube box.

3. The polypropylene-containing particle-in-liquid separation apparatus of claim 1, wherein, The clean water tank and the downcomer are both provided with liquid level meters.

4. The polypropylene-containing particle-in-liquid separation apparatus of claim 1, wherein, The dust-containing water inlet is arranged on the upper head of the dust-containing water tank.

5. The polypropylene-containing particle-in-liquid separation device of claim 1, wherein, The heat exchanger is a shell-and-tube heat exchanger, and the shell side is provided with a heat medium inlet, a heat medium outlet, a discharge port and a vent port.

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