CN210506174U - Polypropylene powder purification device for ring tube method polypropylene process - Google Patents
Polypropylene powder purification device for ring tube method polypropylene process Download PDFInfo
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- CN210506174U CN210506174U CN201921133328.5U CN201921133328U CN210506174U CN 210506174 U CN210506174 U CN 210506174U CN 201921133328 U CN201921133328 U CN 201921133328U CN 210506174 U CN210506174 U CN 210506174U
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Abstract
The utility model relates to a purifier for improving polypropylene powder drying temperature and edulcoration effect. A polypropylene powder purification device for a ring tube method polypropylene process comprises a polypropylene powder purifier, wherein the top end of the polypropylene powder purifier is provided with a low-pressure nitrogen inlet, a powder inlet and a circulating gas outlet, and the bottom end of the polypropylene powder purifier is provided with a gas inlet and a powder outlet; the system also comprises a low-pressure steam pipeline and a nitrogen recovery pipeline, wherein the inlet end of the nitrogen recovery pipeline is connected with a circulating gas outlet; the outlet end of the low-pressure steam pipeline and the outlet end of the nitrogen recovery pipeline are mixed and then connected to a gas inlet; and a distribution plate with through holes is arranged in the polypropylene powder purifier. The utility model discloses the through-hole distributing plate of polypropylene powder clarifier bottom makes low pressure steam and low pressure nitrogen gas evenly distributed. The low-pressure steam can further decompose and carry out the decomposition products such as catalyst, electron donor and the like. The low-pressure nitrogen introduced into the polypropylene powder purifier can prevent the degradation of the powder.
Description
Technical Field
The utility model belongs to the field of the impurity removal and purification of ring pipe method polypropylene technology polypropylene powder, a purifier for improving polypropylene powder drying temperature and impurity removal effect is related to.
Background
The polypropylene powder discharged from the bottom of the bag filter still adsorbs 1 wt% of monomers, mainly propylene, propane and butylene, after entering a steamer, the catalyst and electron donor residues are decomposed, the residual catalyst activity in the catalyst is killed by steam, and simultaneously the propylene and the propane mixed and adsorbed in the polypropylene powder are steamed out, so that the volatile components in the powder are reduced to the minimum. The steamed polypropylene powder is dried to facilitate granulation due to its high moisture content.
The polypropylene powder behind the steam retort still contains a small amount of impurity, and the steam in the steam retort brings into the desicator, and the nitrogen gas in the desicator is not enough to bring the moisture that carries in the powder out completely for local jam after the long-time operation of desicator distributing plate, drying temperature step-down, and then lead to wet powder to get into the extrusion system, cause the polypropylene aggregate that the extrusion granulation goes out to turn white, the product quality incident appears. In addition, the powder which is not purified and discharged from the dryer has peculiar smell after being extruded and granulated, which influences the application range of polypropylene products, for example, the requirement of polypropylene for the smell in the automobile industry is very strict.
In view of the situation, in actual production, the content of steam introduced into a steaming tank is generally adjusted to ensure the impurity removal effect, but excessive steam introduction can increase the moisture content of polypropylene powder, hot nitrogen in a dryer can not completely remove surface condensed water carried by the powder, after long-time operation, part of a distribution plate of the dryer is blocked by wet powder, the hot nitrogen upwards from the distribution plate of the dryer can not completely enter the dryer, the drying temperature of the dryer is lowered, the impurity removal effect is deteriorated, the moisture content of the polypropylene powder is further increased, the distribution plate of the dryer is further blocked, the purification effect of the dryer is further deteriorated, and when the vicious circle reaches a certain degree, only stopping is adopted to clean the distribution plate of the dryer. When the device is started again and operated for a certain time, the situation can continue to happen, so that the problem of purifying the polypropylene powder in the ring-pipe polypropylene process is solved for a long time.
Disclosure of Invention
The utility model aims at providing a ring pipe method polypropylene technology polypropylene powder purifier, the device only uses an equipment and accessory part, can solve ring pipe method polypropylene technology polypropylene powder wet content behind the steaming tank high, the poor problem of edulcoration effect, avoids the device to park because of the unplanned after the desicator distributing plate is blockked up and the big problem of polypropylene powder smell.
The technical scheme of the utility model lies in:
a polypropylene powder purification device for a ring tube method polypropylene process comprises a polypropylene powder purifier, wherein the top end of the polypropylene powder purifier is provided with a low-pressure nitrogen inlet, a powder inlet and a circulating gas outlet, and the bottom end of the polypropylene powder purifier is provided with a gas inlet and a powder outlet; the system also comprises a low-pressure steam pipeline and a nitrogen recovery pipeline, wherein the inlet end of the nitrogen recovery pipeline is connected with a circulating gas outlet; the outlet end of the low-pressure steam pipeline and the outlet end of the nitrogen recovery pipeline are mixed and then connected to a gas inlet; a distribution plate with through holes is arranged in the polypropylene powder purifier; the powder inlet is connected with an external steaming tank, the low-pressure nitrogen inlet is connected with an external nitrogen pipeline, and the powder outlet is connected with an external dryer.
A fresh nitrogen pipeline is also included; and the outlet end of the nitrogen recovery pipeline, the outlet end of the fresh nitrogen pipeline and the outlet end of the low-pressure steam pipeline are mixed and then connected to the gas inlet.
And an exhaust branch is also arranged on the nitrogen recovery pipeline.
And an HV regulating valve and a rotary valve are arranged on a connecting pipeline from the powder outlet to the external dryer.
The polypropylene powder purifier is also provided with a liquid level transmitter, a temperature transmitter and a pressure gauge.
And the low-pressure steam pipeline is sequentially provided with a low-pressure steam source, a steam flow meter, a Y-shaped filter, a steam flow regulating valve and a check valve.
And the fresh nitrogen pipeline is sequentially provided with a nitrogen source, a fresh nitrogen flow regulating valve, a check valve and a fresh nitrogen flow meter.
And a circulating nitrogen flow regulating valve and a circulating nitrogen flow meter are arranged on the nitrogen recovery pipeline.
And a pressure gauge and a pressure regulating valve are arranged on the steam recovery branch and the exhaust branch.
The technical effects of the utility model reside in that:
1. the utility model discloses the distribution plate of through-hole is seted up to polypropylene powder purifier bottom, makes low pressure steam and low pressure nitrogen gas evenly distributed. The low-pressure steam introduced into the polypropylene powder purifier can further decompose and carry out the decomposition products such as catalyst, electron donor and the like, and the polypropylene powder purifier is maintained to operate in a stable temperature range. The low-pressure nitrogen introduced into the polypropylene powder purifier can prevent the degradation of the powder;
2. preferably, the temperature is monitored by the temperature transmitter to prevent steam from being condensed and frozen at low temperature, a large amount of condensed water on the surface of the polypropylene powder is taken away before the polypropylene powder enters the external dryer, the moisture content of the polypropylene powder is greatly reduced, the polypropylene powder can smoothly pass through the bottom distribution plate of the dryer after entering the external dryer, dissolved hydrocarbon is guaranteed to be thoroughly removed, and the smell of polypropylene particles is greatly reduced.
Drawings
FIG. 1 is a schematic structural diagram of a polypropylene powder purification device for a loop process polypropylene process of the present invention.
Reference numerals: the system comprises a liquid level transmitter 1, a temperature transmitter 2, a third pressure gauge 3, an HV adjusting valve 4, a rotary valve 5, a first pressure gauge 6, a first pressure adjusting valve 7, a check valve 8, a steam flow adjusting valve 9, a Y-shaped filter 10, a steam flow meter 11, a fresh nitrogen flow meter 12, a polypropylene powder purifier 13, a fresh nitrogen flow adjusting valve 14, a circulating nitrogen flow adjusting valve 15, a circulating nitrogen flow meter 16, a second pressure gauge 17 and a second pressure adjusting valve 18.
Detailed Description
Example 1
A polypropylene powder purification device for a ring tube method polypropylene process comprises a polypropylene powder purifier 13, wherein the top end of the polypropylene powder purifier 13 is provided with a low-pressure nitrogen inlet, a powder inlet and a circulating gas outlet, and the bottom end of the polypropylene powder purifier is provided with a gas inlet and a powder outlet; the system also comprises a low-pressure steam pipeline and a nitrogen recovery pipeline, wherein the inlet end of the nitrogen recovery pipeline is connected with a circulating gas outlet; the outlet end of the low-pressure steam pipeline and the outlet end of the nitrogen recovery pipeline are mixed and then connected to a gas inlet; the polypropylene powder purifier 13 is internally provided with a distribution plate with through holes, so that low-pressure steam and nitrogen are uniformly distributed, and a certain flow rate is ensured, so that the retention time is prolonged; impurities (water, propylene, propane, butylene and the like) in the powder are removed in the process that the nitrogen is contacted with the polypropylene powder, and the inner surface, the outer surface and the through holes of the distribution plate need to be polished so as to avoid the adhesion of the powder; the powder inlet is connected with an external steaming tank, the low-pressure nitrogen inlet is connected with an external nitrogen pipeline, and the powder outlet is connected with an external dryer; the nitrogen recovery pipeline is also connected with a steam recovery branch.
Example 2
On the basis of the embodiment 1, a fresh nitrogen pipeline is also included; and the outlet end of the nitrogen recovery pipeline, the outlet end of the fresh nitrogen pipeline and the outlet end of the low-pressure steam pipeline are mixed and then connected to the gas inlet. Fresh nitrogen is sourced from utilities.
Example 3
On the basis of the embodiment 2, the nitrogen recovery pipeline is also provided with an exhaust branch.
Example 4
On the basis of example 3, a HV regulating valve 4 and a rotary valve 5 are arranged on the connecting pipeline from the powder outlet to the external dryer. The polypropylene powder purifier 13 is also provided with a liquid level transmitter 1, a temperature transmitter 2 and a third pressure gauge 3. And the low-pressure steam pipeline is sequentially provided with a low-pressure steam source, a steam flow meter 11, a Y-shaped filter 10, a steam flow regulating valve 9 and a check valve 8. And the fresh nitrogen pipeline is sequentially provided with a nitrogen source, a fresh nitrogen flow regulating valve 14, a check valve 8 and a fresh nitrogen flow meter 12. And a circulating nitrogen flow regulating valve 15 and a circulating nitrogen flow meter 16 are arranged on the nitrogen recovery pipeline. And a pressure gauge and a pressure regulating valve are arranged on the steam recovery branch and the exhaust branch. Wherein, a first pressure gauge 6 and a first pressure regulating valve 7 are arranged on the steam recovery branch; the second pressure regulating valve 18 and a second pressure gauge 17 are arranged on the exhaust branch, the second pressure regulating valve 18 is used for preventing the polypropylene powder purifier 13 from generating overpressure phenomenon, and the outlet of the second pressure regulating valve is connected with a torch discharge pipe network.
Polypropylene powder purifier 13 wet nitrogen and pressure control: the amount and proportion of wet nitrogen entering the polypropylene powder purifier 13 are controlled to be stable so as to ensure the removal of dissolved hydrocarbon and the decomposition products of the auxiliary agent. The nitrogen recovered from the recovery unit is reused as much as possible via the circulating nitrogen flow regulating valve 15 and the total nitrogen set point is supplemented with fresh nitrogen via the fresh nitrogen flow regulating valve 14. And if the quantity of the recovered nitrogen is larger than the required quantity, stopping the flow of the fresh nitrogen, and discharging the redundant recovered nitrogen to a flare discharge pipe network through a second pressure regulating valve 18. Low pressure steam is added at a design rate using steam flow regulator valve 9.
And (3) material level control of a polypropylene powder purifier: the material level is stable, the retention time of 0.5 hour is ensured to fully remove the hydrocarbons and the auxiliary agent decomposers in the powder, and the control range is as follows: 30-50%, the material level is controlled by the rotating speed of the motor of the rotary valve 5. When the liquid level transmitter 1 gives a high alarm and cannot adjust the material level, the rotary valve 5 needs to be stopped to carry out emergency repair treatment.
The utility model discloses in the device is the commercial product. For example, the model of the liquid level transmitter 1 is TCT2088T, the model of the temperature transmitter 2 is pt100, the model of the first pressure gauge 6, the model of the second pressure gauge 17 and the model of the third pressure gauge 3 are YTF-100H, the model of the HV adjusting valve 4 is HV4300, the model of the rotary valve 5 is X43F, the model of the first pressure regulating valve 7 and the model of the second pressure regulating valve 19 are DYF8-Y43H-16C-DN100, the model of the check valve is H41H-16, the model of the steam flow regulating valve 9, the model of the fresh nitrogen flow regulating valve 14 and the model of the circulating nitrogen flow regulating valve 15 are PS50-36H, the model of the Y-type filter is GL41H, the model of the steam flow meter 11, the model of the fresh nitrogen flow meter and the model of the circulating nitrogen flow meter are DK32, the common powder purifying bin on the market is selected as the polypropylene powder purifying device, for example, the application number is CN2011 881.X, and the powder purifying bins, only the relevant inlets and outlets required by the scheme are added.
Claims (9)
1. The utility model provides a ring pipe method polypropylene technology polypropylene powder purifier, includes polypropylene powder clarifier, its characterized in that: the top end of the polypropylene powder purifier is provided with a low-pressure nitrogen inlet, a powder inlet and a circulating gas outlet, and the bottom end of the polypropylene powder purifier is provided with a gas inlet and a powder outlet; the system also comprises a low-pressure steam pipeline and a nitrogen recovery pipeline, wherein the inlet end of the nitrogen recovery pipeline is connected with a circulating gas outlet; the outlet end of the low-pressure steam pipeline and the outlet end of the nitrogen recovery pipeline are mixed and then connected to a gas inlet; a distribution plate provided with through holes is arranged in the polypropylene powder purifier; the powder inlet is connected with an external steaming tank, the low-pressure nitrogen inlet is connected with an external nitrogen pipeline, and the powder outlet is connected with an external dryer.
2. The polypropylene powder purifying device for the ring-tube polypropylene process according to claim 1, which is characterized in that: a fresh nitrogen pipeline is also included; and the outlet end of the nitrogen recovery pipeline, the outlet end of the fresh nitrogen pipeline and the outlet end of the low-pressure steam pipeline are mixed and then connected to the gas inlet.
3. The annular tube polypropylene process polypropylene powder purifying device according to claim 2, wherein: and an exhaust branch is also arranged on the nitrogen recovery pipeline.
4. The polypropylene powder purifying device for the ring-tube polypropylene process according to claim 3, which is characterized in that: and a HV regulating valve (4) and a rotary valve (5) are arranged on a connecting pipeline from the powder outlet to the external dryer.
5. The polypropylene powder purifying device for the ring-tube polypropylene process according to claim 4, which is characterized in that: the polypropylene powder purifier is also provided with a liquid level transmitter (1), a temperature transmitter (2) and a pressure transmitter.
6. The polypropylene powder purifying device for the ring tube process polypropylene according to claim 5, which is characterized in that: the low-pressure steam pipeline is sequentially provided with a low-pressure steam source, a steam flow meter (11), a Y-shaped filter (10), a steam flow regulating valve (9) and a check valve (8).
7. The polypropylene powder purifying device for the ring-tube polypropylene process according to claim 6, which is characterized in that: and the fresh nitrogen pipeline is sequentially provided with a nitrogen source, a fresh nitrogen flow regulating valve (14), a check valve (8) and a fresh nitrogen flow meter (12).
8. The polypropylene powder purifying device for the ring-tube polypropylene process according to claim 7, which is characterized in that: and a circulating nitrogen flow regulating valve (15) and a circulating nitrogen flow meter (16) are arranged on the nitrogen recovery pipeline.
9. The polypropylene powder purifying device for the ring-tube polypropylene process according to claim 8, which is characterized in that: and the steam recovery branch and the exhaust branch are respectively provided with a pressure transmitter and a pressure regulating valve.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921133328.5U CN210506174U (en) | 2019-07-19 | 2019-07-19 | Polypropylene powder purification device for ring tube method polypropylene process |
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| CN201921133328.5U CN210506174U (en) | 2019-07-19 | 2019-07-19 | Polypropylene powder purification device for ring tube method polypropylene process |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115819647A (en) * | 2022-10-28 | 2023-03-21 | 青岛国恩科技股份有限公司 | Preparation method of low-odor polypropylene material |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115819647A (en) * | 2022-10-28 | 2023-03-21 | 青岛国恩科技股份有限公司 | Preparation method of low-odor polypropylene material |
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