Polypropylene cyclone separator blowback system

Abstract

The utility model discloses a polypropylene cyclone separator blowback system which comprises a cyclone separator and a fine powder collector, the cyclone separator is communicated with the fine powder collector through a discharging pipeline, and a first stop valve and a first electromagnetic valve are arranged on the discharging pipeline. The stop valve I and the electromagnetic valve I are correspondingly close to a blanking port of the cyclone separator and a feeding port of the fine powder collector, the discharging pipeline is further communicated with a nitrogen back flushing pipeline, the nitrogen back flushing pipeline is located between the stop valve I and the electromagnetic valve I, and the nitrogen back flushing pipeline is provided with an electromagnetic valve II; the fine powder collector is communicated with a powder outlet pipeline, and the powder outlet pipeline is provided with a second stop valve and a third electromagnetic valve. According to the utility model, the flow of the cyclone separation system is modified, the nitrogen back flushing system is additionally arranged on the discharge pipeline of the cyclone separator, and regular back flushing is realized by an automatic control program, so that bridging powder at the bottom of the cyclone separator is loosened, the cyclone separator can discharge normally, and a better use effect is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of polypropylene production, in particular to an anti-blowing system for a polypropylene cyclone separator. Background Technique

[0002] Polypropylene is a general-purpose plastic with excellent performance and wide application, and is used in fields such as packaging, manufacturing, medical use, textiles, and many civil consumptions. In the process control of polypropylene production, in the powder drying section, the polypropylene resin is mainly dried by the circulation of hot nitrogen to facilitate the subsequent transportation and processing. In recent years, with the upgrade of catalysts and the demand for high-end product differentiation in the downstream market, during the production of high melt index products using new and efficient catalysts, a large amount of fine powder is generated during the reaction process, seriously affecting the stable operation of the powder drying unit.

[0003] The powder drying unit in the device adopts a closed-loop circulation hot nitrogen circulation drying method to remove the moisture existing in the polymer. It consists of a fluidized bed dryer D502, a cyclone separator S502, a circulating gas scrubbing tower T502, a nitrogen circulating fan C502, etc. The powder containing a certain amount of moisture, under the control of the material level, is dehydrated by the fluidized bed dryer D502 and then flows to the pneumatic conveying hopper from the bottom of the dryer by its own gravity. Nitrogen flows from the top of the dryer to the D502 cyclone separator S502 to remove the polymer fine powder entrained in the nitrogen. The polymer fine powder separated from S502 is first collected in the polypropylene fine powder collector D507 and then sent to D800A (or B). In actual production, due to the differences in different catalysts and different product grades, a large amount of fine powder is generated in the polymerization unit. During the dehumidification process of the polypropylene powder in the drying unit, the fine powder with a smaller particle size will accumulate in the cyclone separator S502 in large quantities, causing bridging and affecting the normal discharge. As the fine powder continuously accumulates in S502, S502 loses its separation function, and a large amount of fine powder is carried into the subsequent scrubbing tower T502, affecting the long-term operation of the filtering equipment and dynamic equipment in the subsequent system, and at the same time causing a large amount of siltation of the fine powder at the wastewater tank of T502, polluting the surrounding environment, and a large amount of manpower needs to be invested for regular cleaning. Due to the defects and irrationality in the actual production situation, it has become an urgent technical problem to be solved. Content of the Utility Model

[0004] The technical problem to be solved by the utility model is to overcome the existing defects, provide an anti-blowing system for a polypropylene cyclone separator, transform the process of the cyclone separation system, add a nitrogen anti-blowing system to the outlet pipeline of the cyclone separator, and realize regular anti-blowing by an automatic control program to loosen the bridged powder at the bottom of the cyclone separator, so that the cyclone separator can discharge normally, achieving a better use effect, and effectively solving the problems in the background technique.

[0005] To achieve the above object, the utility model provides the following technical solution: a polypropylene cyclone separator backflush system, including a cyclone separator and a fine powder collector. The cyclone separator is communicated with the fine powder collector through a discharge pipeline. A stop valve I and a solenoid valve I are arranged on the discharge pipeline. The stop valve I and the solenoid valve I are respectively close to the material falling port of the cyclone separator and the feed port of the fine powder collector. The discharge pipeline is also communicated with a nitrogen backflush pipeline, and the nitrogen backflush pipeline is located between the stop valve I and the solenoid valve I. A solenoid valve II is arranged on the nitrogen backflush pipeline. The fine powder collector is communicated with a powder discharge pipeline, and a stop valve II and a solenoid valve III are arranged on the powder discharge pipeline.

[0006] Preferably, it further includes a PLC controller, which is electrically connected to the solenoid valve I, the solenoid valve II and the solenoid valve III and controls the on-off of the solenoid valve I, the solenoid valve II and the solenoid valve III through a program.

[0007] Preferably, two ball valves are also arranged on the nitrogen backflush pipeline, and the two ball valves are respectively located on both sides of the solenoid valve II.

[0008] Preferably, a standby pipeline is connected in parallel to the nitrogen backflush pipeline, and a standby ball valve is arranged on the standby pipeline.

[0009] Preferably, the feed port of the cyclone separator is communicated with a feed pipeline, and the material in the feed pipeline is polymer fine powder transported by nitrogen. The exhaust port of the cyclone separator is communicated with a scrubbing tower.

[0010] Preferably, the nitrogen backflush pipeline is externally connected to the workshop nitrogen system.

[0011] Compared with the prior art, the beneficial effect of the utility model is that: by adding a nitrogen backflush pipeline and a valve assembly in the middle of the discharge pipeline and performing program control through the PLC controller, it is not necessary to increase the size of the cyclone separation equipment and the supporting process pipeline. Only a small part of the transformation is carried out within the polypropylene device, achieving a good use effect, meeting the normal production requirements of the cyclone separation unit, solving the problem of normal production and operation of the polypropylene device system, and achieving a good use and operation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic structural diagram of the utility model.

[0013] In the figure: 1 feed pipeline, 2 cyclone separator, 3 fine powder collector, 4 stop valve I, 5 solenoid valve I, 6 stop valve II, 7 solenoid valve III, 8 ball valve, 9 solenoid valve II, 10 standby ball valve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0014] The present utility model can be explained in detail through the following embodiments. The purpose of disclosing the present utility model is to protect all technical improvements within the scope of the present utility model. In the description of the present utility model, it should be understood that if there are terms such as "upper", "lower", "front", "rear", "left", "right", etc. indicating the orientation or positional relationship, it is only corresponding to the drawings of the present application. For the convenience of describing the present utility model, it does not indicate or imply that the device or element referred to must have a specific orientation.

[0015] Please refer to Figure 1 , the present utility model provides a technical solution: a reverse blowing system for a polypropylene cyclone separator, including a cyclone separator 2 and a fine powder collector 3. The cyclone separator 2 is connected to the fine powder collector 3 through a discharge pipeline. A stop valve 1 4 and a solenoid valve 1 5 are provided on the discharge pipeline. The stop valve 1 4 and the solenoid valve 1 5 are correspondingly close to the material falling port of the cyclone separator 2 and the feed port of the fine powder collector 3. The discharge pipeline is also connected to a nitrogen reverse blowing pipeline. The nitrogen reverse blowing pipeline is located between the stop valve 1 4 and the solenoid valve 1 5. A solenoid valve 2 9 is provided on the nitrogen reverse blowing pipeline; the fine powder collector 3 is connected to a powder discharge pipeline. A stop valve 2 6 and a solenoid valve 3 7 are provided on the powder discharge pipeline; By adding a nitrogen reverse blowing pipeline and related valve components in the middle of the discharge pipeline, that is, by opening the solenoid valve 2 9, nitrogen is blown to the discharge pipeline and the cyclone separator 2, which can loosen the powder in the cyclone separator 2 and the discharge pipeline, effectively prevent bridging, meet the discharge effect, and achieve better use and operation effects. There is no need to increase the size of the cyclone separation equipment and supporting process pipelines. Only a small part of the transformation is carried out within the polypropylene device to meet the normal production requirements of the cyclone separation unit and solve the problem of normal production and operation of the polypropylene device system;

[0016] Furthermore, the reverse blowing system for the polypropylene cyclone separator further includes a PLC controller. The PLC controller is electrically connected to the solenoid valve 1 5, the solenoid valve 2 9, and the solenoid valve 3 7 and program-controls the on / off of the solenoid valve 1 5, the solenoid valve 2 9, and the solenoid valve 3 7; That is, program control. For example, after the solenoid valve 1 5 is closed, the solenoid valve 2 9 is opened after a delay of 2S. The opening time of the solenoid valve 2 9 (reverse blowing time) can be set by itself, such as 5 seconds, 10 seconds, etc. After the time, the solenoid valve 2 9 automatically closes, realizing remote automatic program control.

[0017] Furthermore, two ball valves 8 are also provided on the nitrogen reverse blowing pipeline. The two ball valves 8 are correspondingly located on both sides of the solenoid valve 2 9; A spare pipeline is also connected in parallel to the nitrogen reverse blowing pipeline. A spare ball valve 10 is provided on the spare pipeline; The spare ball valve 10 is in a closed state during normal use. When the solenoid valve 2 9 is damaged and needs to be repaired, the reverse blowing function can be realized manually by switching the spare ball valve 10. The two ball valves 8 are used for closing and isolating during the maintenance of the solenoid valve 2 9 and are in an open state during normal use;

[0018] In addition, the feed inlet of the cyclone separator 2 is connected to a feed pipeline 1. The material in the feed pipeline 1 is polymer fine powder transported by nitrogen. The exhaust port of the cyclone separator 2 is connected to a scrubbing tower. The nitrogen back-blowing pipeline is externally connected to the nitrogen system in the workshop, directly using the existing nitrogen system in the production workshop without the need for additional equipment gas sources, which is convenient to use.

[0019] The parts not detailed in the present utility model are prior art. For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, aiming to encompass all changes falling within the meaning and scope of the equivalent elements in the content of the present utility model.

Claims

1. A polypropylene cyclone separator backflush system, comprising a cyclone separator (2) and a fine powder collector (3), characterized in that: The cyclone separator (2) is connected to the fine powder collector (3) through a discharge pipeline. A stop valve (4) and a solenoid valve (5) are provided on the discharge pipeline. The stop valve (4) and the solenoid valve (5) are located at a discharge port of the cyclone separator (2) and a feed port of the fine powder collector (3) respectively. The discharge pipeline is also connected to a nitrogen backflush pipeline. The nitrogen backflush pipeline is located between the stop valve (4) and the solenoid valve (5). The nitrogen backflush pipeline is provided with a solenoid valve (9). The fine powder collector (3) is connected to a powder discharge pipeline. The powder discharge pipeline is provided with a stop valve (6) and a solenoid valve (7).

2. A polypropylene cyclone separator backflush system according to claim 1, characterized in that: The system also includes a PLC controller, which is electrically connected to the first solenoid valve (5), the second solenoid valve (9) and the third solenoid valve (7) and controls the on and off of the first solenoid valve (5), the second solenoid valve (9) and the third solenoid valve (7) through a program.

3. A polypropylene cyclone separator backflush system according to claim 1, characterized in that: The nitrogen backflush pipeline is also provided with two ball valves (8), and the two ball valves (8) are correspondingly located on both sides of the second solenoid valve (9).

4. A polypropylene cyclone separator backflush system according to claim 1, characterized in that: The nitrogen backflush pipeline is also connected in parallel with a spare pipeline, which is provided with a spare ball valve (10).

5. A polypropylene cyclone separator backflush system according to claim 1, characterized in that: The feed port of the cyclone separator (2) is connected to a feed pipeline (1), the material in the feed pipeline (1) is polymer fine powder transported by nitrogen, and the exhaust port of the cyclone separator (2) is connected to a washing tower.

6. A polypropylene cyclone separator backflush system according to claim 1, characterized in that: The nitrogen backflush pipeline is externally connected to the workshop nitrogen system.

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