Polypropylene device capable of preventing reactor from being blocked
By setting up a flushing propylene feed branch pipe and a distribution ring structure at the bottom of the reactor, the problem of discharge hole blockage was solved, achieving efficient discharge operation and reducing downtime and manual intervention.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-08
- Publication Date
- 2026-03-31
AI Technical Summary
The discharge port of the batch reactor is prone to blockage due to the accumulation of polypropylene slurry, which leads to shutdown and difficulty in unloading. Existing methods are laborious and ineffective.
A flushing propylene feed branch pipe is installed at the bottom of the reactor. The flow rate is controlled by a flow restrictor plate. The flushing propylene distribution ring is used to flush the discharge hole in reverse. Combined with the design of the guide pipe and nozzle, uniform flushing is ensured.
It effectively prevents blockage of the unloading hole, reduces downtime for unloading, increases unloading speed, and avoids abnormal operation by personnel.
Smart Images
Figure CN224057342U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to polypropylene device technical field, concretely relates to a reactor prevents the polypropylene device of jamming. BACKGROUND
[0002] The reaction principle of the SPG process of the polypropylene device in the petroleum chemical industry is that high-efficiency carrier catalyst is used as the main catalyst, triethyl aluminum is used as the cocatalyst, silane is used as the electron donor, hydrogen is used as the molecular weight regulator, and propylene is used as the polymerization monomer to produce the polypropylene product.
[0003] The kettle type reactor is a commonly used device for the polypropylene reactor, which removes the reaction heat by using the latent heat of liquid evaporation. Most of the evaporated gas is returned to the reactor after being condensed by circulation, and the uncondensed gas is circulated back to the reactor after being pressurized by a compressor. The kettle type reactor is provided with a special unloading hole in the lower part, which is used to unload the polypropylene material during the reaction period during shutdown and maintenance. Due to the characteristics of the polypropylene reaction, propylene is polymerized in the first reactor under the action of the catalyst to produce polypropylene slurry. The polypropylene is accumulated in the gap around the unloading hole, which causes the unloading hole to be blocked, and it is difficult to open the unloading hole during shutdown. In view of the situation that the polypropylene is blocked and it is difficult to open the unloading hole after the unloading hole is shut down, a method of heating and purging the polypropylene by steam is generally used for treatment, which not only consumes a lot of labor but also still cannot smoothly open the unloading hole, affecting the progress of the unloading during shutdown. UTILITY MODEL CONTENTS
[0004] The utility model provides a reactor prevents the polypropylene device of jamming, flushes propylene feed branch line orifice plate and flushes propylene distribution ring, can not only avoid personnel on-site abnormal operation, but also can reduce the dismounting time of the loading and unloading hole, improves the shutdown unloading rate.
[0005] The technical scheme of the utility model is as follows:
[0006] The reactor anti-blocking polypropylene device comprises a propylene raw material tank, a first reactor, a condenser, a condensate tank, a second reactor and a controller; the propylene raw material tank and the first reactor are connected through a propylene raw material feeding pipeline, the propylene raw material feeding pipeline comprises two branch pipelines, the two branch pipelines are respectively a reaction propylene feeding branch pipeline and a flushing propylene feeding branch pipeline, the reaction propylene feeding branch pipeline is connected with an upper feeding port of the first reactor, and the flushing propylene feeding branch pipeline is connected with a bottom discharging hole of the first reactor; the flushing propylene feeding branch pipeline is provided with a feeding valve, a flow limiting orifice plate and a pressure sensor, the pressure sensor is electrically connected with the controller; the first reactor is further provided with a prepolymerization kettle, a catalyst slurry feeding pipeline and a gas phase propylene circulating pipeline, the catalyst slurry feeding pipeline is connected with the upper feeding port of the first reactor; the first reactor is sequentially connected with the condenser and the condensate tank through the gas phase propylene circulating pipeline, the condensate tank is connected with a top reflux port of the first reactor through a pipeline, the gas phase propylene circulating pipeline is directly connected with the condensate tank through a pipeline, an outlet of the condensate tank is connected with the first reactor through a propylene circulating pipeline II, the first reactor is connected with the second reactor through a pipeline, and a bottom of the second reactor is connected with a polypropylene discharging pipeline; the flushing propylene feeding branch pipeline is connected with a flushing propylene distribution ring through the bottom discharging hole of the first reactor, a discharging port of the flushing propylene feeding branch pipeline is connected with a middle liquid inlet of the flushing propylene distribution ring, the flushing propylene distribution ring is provided with a hollow liquid spraying channel and a plurality of edge flushing holes, the edge flushing holes are provided with flow guide pipes, and the flow guide pipes are connected with nozzles.
[0007] Preferably, the edge flushing holes are uniformly arranged along the circumferential direction of the flushing propylene distribution ring.
[0008] Preferably, one edge flushing hole is arranged every 12°, and 30 edge flushing holes are arranged along the circumferential direction.
[0009] Preferably, the liquid spraying channel comprises a linear channel arranged at the middle part of the flushing propylene distribution ring and a ring channel arranged along the circumferential direction of the linear channel.
[0010] Preferably, the propylene raw material feeding pipeline is provided with a propylene raw material feeding pump.
[0011] Preferably, the propylene circulating pipeline II is provided with a propylene circulating pump.
[0012] Compared with the prior art, the polypropylene device has the following beneficial effects:
[0013] 1.The utility model discloses a flushing propylene feed branch line is additionally arranged, controls the flushing pressure to be higher than the first reactor pressure, controls the flushing flow through the flow restrictor, sets up the pressure sensor monitoring propylene flushing pressure, and the flushing propylene inlet and discharge hole is arranged at the flushing propylene distribution ring, the flushing propylene distribution ring is contrary along the distribution ring and the flushing propylene feed direction, and the reverse flushing discharge hole is avoided, and the polypropylene slurry is gathered and is blocked, and simultaneously prevents the first reactor polypropylene slurry from pouring and channelling and blocking the pipeline, which can not only avoid the personnel on-site abnormal operation, but also reduce the loading and unloading hole dismounting time, improve the shutdown unloading rate.
[0014] 2.The edge flushing hole is evenly arranged along the circumferential direction of the flushing propylene distribution ring, and one is arranged every 12 degrees, and a total of 30 are arranged in the circumferential direction, so that the flushing propylene can be uniformly distributed around the discharge hole, improve the flushing effect, and further enhance the anti-blocking ability.
[0015] 3.The liquid jet channel includes a straight channel and a ring channel, which can make the flushing propylene flow into the edge flushing hole more uniformly, and ensure the uniformity and stability of the flushing.
[0016] 4.The cooperation of the flow guide pipe and the nozzle helps the flushing propylene to be uniformly and more favorably sprayed from the nozzle, enhances the flushing ability of the material accumulation or adhesion that may exist at the discharge hole, and effectively prevents the occurrence of blockage. DRAWINGS
[0017] Figure 1 It is the structural schematic diagram of the utility model.
[0018] Figure 2 It is the flushing process structural schematic diagram of the utility model flushing propylene feed branch line.
[0019] Figure 3 It is the structural schematic diagram of the utility model flushing propylene distribution ring.
[0020] Figure 4 It is the structural schematic diagram of the utility model edge flushing hole, flow guide pipe and nozzle.
[0021] In the diagram, 1. Propylene feed tank; 2. First reactor; 3. Condenser; 4. Condensate tank; 5. Propylene feed pipeline; 501. Reaction propylene feed branch pipeline; 502. Flushing propylene feed branch pipeline; 5021. Feed valve; 5022. Flow limiting orifice plate; 5023. Pressure sensor; 504. Propylene feed pump; 6. Discharge port; 7. Prepolymer reactor to catalyst slurry feed pipeline; 8. Gas phase propylene circulation pipeline; 9. Propylene circulation pipeline II; 901. Propylene circulation pump; 10. Flushing propylene distribution ring; 1001. Liquid inlet; 1002. Edge flushing hole; 1003. Guide pipe; 1004. Nozzle; 1005. Straight channel; 1006. Annular channel; 11. Second reactor; 12. Polypropylene discharge pipeline. Detailed Implementation
[0022] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this utility model.
[0023] Example 1
[0024] like Figures 1-4 As shown, this embodiment provides a polypropylene device for preventing blockage of the first reactor 2, including a propylene raw material tank 1, a first reactor 2, a condenser 3, a condensate tank 4, a second reactor 11, and a controller;
[0025] The propylene feed tank 1 and the first reactor 2 are connected by a propylene feed pipeline 5. The propylene feed pipeline 5 includes two branch pipelines, namely a reaction propylene feed branch pipeline 501 and a flushing propylene feed branch pipeline 502. The reaction propylene feed branch pipeline 501 is connected to the upper feed port of the first reactor 2, and the flushing propylene feed branch pipeline 502 is connected to the bottom discharge port 6 of the first reactor 2. The propylene feed pipeline 5 is equipped with a propylene feed pump 504.
[0026] The propylene feed branch line 502 is equipped with a feed valve 5021, a flow limiting orifice plate 5022 and a pressure sensor 5023, and the pressure sensor 5023 is electrically connected to the controller;
[0027] The first reactor 2 is also equipped with a prepolymerization reactor catalyst slurry feed pipeline 7 and a gas phase propylene circulation pipeline 8. The prepolymerization reactor catalyst slurry feed pipeline 7 is connected to the upper feed port of the first reactor 2.
[0028] The first reactor 2 is connected with the condenser 3 and the condensate tank 4 in sequence through the gas-phase propylene circulation pipeline 8, the condensate tank 4 is communicated with the top reflux port of the first reactor 2 through the pipeline, the gas-phase propylene circulation pipeline 8 is also directly communicated with the condensate tank 4 through the pipeline, the outlet of the condensate tank 4 is communicated with the first reactor 2 through the propylene circulation pipeline two 9, the propylene circulation pipeline two 9 is provided with a propylene circulation pump 901, the first reactor 2 is connected with the second reactor 11 through the pipeline, and the bottom of the second reactor 11 is connected with the polypropylene discharge pipeline 12.
[0029] The flushing propylene feed branch pipeline 502 is connected with the flushing propylene distribution ring 10 through the discharge hole 6 in the bottom of the first reactor 2, the flushing propylene feed branch pipeline 502 is communicated with the middle liquid inlet 1001 of the flushing propylene distribution ring 10, the flushing propylene distribution ring 10 is provided with a hollow structure of the liquid injection channel and a plurality of edge flushing holes 1002, the edge flushing holes 1002 are uniformly arranged along the circumferential direction of the flushing propylene distribution ring 10, one edge flushing hole 1002 is arranged every 12 degrees, and a total of 30 edge flushing holes 1002 are arranged along the circumferential direction; the liquid injection channel comprises a character channel 1005 arranged in the middle of the flushing propylene distribution ring 10 and an annular channel 1006 arranged in the circumferential direction of the character channel 1005; the edge flushing hole 1002 is provided with a flow guide pipe 1003, and the flow guide pipe 1003 is connected with a nozzle 1004.
[0030] Working process: the propylene raw material in the propylene raw material tank 1 enters the first reactor 2 through the reaction propylene feed branch pipeline 501, the prepolymerization kettle catalyst slurry enters the upper inlet of the first reactor 2 through the prepolymerization kettle catalyst slurry feed pipeline 7, and the propylene raw material is subjected to polymerization reaction;
[0031] At the same time, the feed valve 5021 on the flushing propylene feed branch pipeline 502 is opened, the propylene in the propylene raw material tank 1 enters the flushing propylene distribution ring 10 after passing through the propylene raw material feed pump 504 and the flow limiting orifice plate 5022. The propylene first enters the middle liquid inlet 1001, and then is uniformly distributed to each edge flushing hole 1002 through the character channel 1005 and the annular channel 1006, and then is sprayed out from the nozzle 1004 through the flow guide pipe 1003, so as to flush the discharge hole 6 and the surrounding area, and prevent the material from blocking the discharge hole. The flushing pressure is controlled to be higher than 4.0 MPa, which is about 1.0 MPa higher than the pressure 3.0 MPa of the first reactor 2, the flushing flow is controlled to be 200 kg / h through the flow limiting orifice plate 5022, and in this process, the pressure sensor 5023 monitors the pressure of the flushing propylene in real time, so that the flushing process is ensured to be normally carried out.
[0032] The gas phase propylene and hydrogen produced in the first reactor 2 are condensed in the condenser 3, and the rest part is taken as bypass gas of the external circulation condenser and does not directly enter the condenser 3. The liquid phase propylene from the condenser 3 is separated from the condensed liquid tank 4 and returns to the first reactor 2 by gravity, and the polymerization heat is taken away through repeated vaporization and condensation of the propylene. Part of the liquid propylene in the condensed liquid tank 4 returns to the top reflux port of the first reactor 2 through a pipeline, and the other part enters the first reactor 2 again under the action of the propylene circulating pump 901 through the propylene circulating pipeline 2 9, so as to realize the recycling of the propylene. The propylene and polypropylene slurry leaving the first reactor 2 enter the second reactor 11 for gas phase polymerization by relying on the pressure difference, and the polypropylene product is produced by entraining propylene gas.
[0033] Although the utility model has been described in detail by referring to the accompanying drawings and in combination with the preferred embodiments, the utility model is not limited thereto. Those skilled in the art can make various equivalent modifications or replacements to the embodiments of the utility model without departing from the spirit and essence of the utility model, and these modifications or replacements shall be within the scope of the utility model. Therefore, the protection scope of the utility model shall be subject to the protection scope of the claims.
Claims
1. A reactor plugging resistant polypropylene plant characterized by, The application relates to a propylene production system, which comprises a propylene raw material tank (1), a first reactor (2), a condenser (3), a condensate tank (4), a second reactor (11) and a controller. The propylene raw material tank (1) and the first reactor (2) are communicated through a propylene raw material feeding pipeline (5), the propylene raw material feeding pipeline (5) comprises two branch pipelines, namely a reaction propylene feeding branch pipeline (501) and a flushing propylene feeding branch pipeline (502), the reaction propylene feeding branch pipeline (501) is communicated with an upper feeding port of the first reactor (2), and the flushing propylene feeding branch pipeline (502) is communicated with a bottom discharging hole (6) of the first reactor (2); The flushing propylene feeding branch pipeline (502) is provided with a feeding valve (5021), a flow limiting orifice plate (5022) and a pressure sensor (5023), and the pressure sensor (5023) is electrically connected with the controller. The first reactor (2) is further provided with a prepolymerization kettle catalyst slurry feeding pipeline (7) and a gas phase propylene circulating pipeline (8), the prepolymerization kettle catalyst slurry feeding pipeline (7) is communicated with the upper feeding port of the first reactor (2); The first reactor (2) is sequentially connected with the condenser (3) and the condensate tank (4) through the gas phase propylene circulating pipeline (8), the condensate tank (4) is communicated with a top reflux port of the first reactor (2) through a pipeline, the gas phase propylene circulating pipeline (8) is directly communicated with the condensate tank (4) through a pipeline, the outlet of the condensate tank (4) is communicated with the first reactor (2) through a propylene circulating pipeline II (9), the first reactor (2) is connected with the second reactor (11) through a pipeline, and the bottom of the second reactor (11) is connected with a polypropylene discharging pipeline (12); The flushing propylene feeding branch pipeline (502) is connected with a flushing propylene distribution ring (10) penetrating through the bottom discharging hole (6) of the first reactor (2), the flushing propylene feeding branch pipeline (502) is communicated with a middle liquid inlet (1001) of the flushing propylene distribution ring (10), the flushing propylene distribution ring (10) is provided with a hollow structure spray channel and a plurality of edge flushing holes (1002), the edge flushing hole (1002) is provided with a flow guide pipe (1003), and the flow guide pipe (1003) is connected with a nozzle (1004).
2. The reactor anti-plugging polypropylene device of claim 1, wherein, The edge flushing holes (1002) are evenly arranged along the circumferential direction of the flushing propylene distribution ring (10).
3. The reactor anti-plugging polypropylene device of claim 2, wherein, The edge flushing holes (1002) are arranged at an interval of 12 degrees, and a total of 30 edge flushing holes are arranged along the circumferential direction.
4. The reactor anti-plugging polypropylene device of claim 1, wherein, The spray channel comprises a straight channel (1005) arranged at the middle part of the flushing propylene distribution ring (10) and an annular channel (1006) arranged along the circumferential direction of the straight channel (1005).
5. The reactor anti-plugging polypropylene device of claim 1, wherein, The propylene raw material feeding pipeline (5) is provided with a propylene raw material feeding pump (504).
6. The reactor anti-plugging polypropylene device of claim 1, wherein, The propylene circulating pipeline II (9) is provided with a propylene circulating pump (901).