Polyethylene slurry material high-efficiency recovery device
By using a sealed sampling box and collector system, the problems of slurry solidification and open-air storage in polyethylene production have been solved, achieving efficient recycling and safe production, and improving resource utilization and safety.
Patent Information
- Application Number
- CN202521216969.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-14
- Publication Date
- 2026-08-25
- Estimated Expiration
- 2035-06-14
AI Technical Summary
In the current polyethylene production process, the slurry sampling has problems of solidification and open-air storage, which leads to resource waste and safety risks. In addition, traditional sampling equipment is inefficient and not airtight enough.
By employing a sealed sampling box and collector, combined with a slurry pump, pneumatic solenoid valve, and nitrogen flushing system, the system achieves sealed sampling and efficient recovery of slurry, avoiding the risks of solidification and flash explosion.
It improves the recovery rate of powder and ethane, reduces energy consumption, ensures production safety and environmental friendliness, and avoids the risks of "dead samples" and flash explosions.
Smart Images
Figure CN224681850U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of chemical production equipment technology, and in particular to a high-efficiency recovery device for polyethylene slurry. Background Technology
[0002] In the production of polyethylene (PE), slurry sampling is an indispensable and important part of quality control. Slurry usually contains unreacted catalysts, polyethylene powder, and hexane. Achieving efficient recovery of these powders is of great significance for improving resource utilization, ensuring production safety, and maintaining environmental friendliness.
[0003] There are many problems with the current recycling of polymer slurry, such as the need to remove "dead samples" before each sampling cycle. The causes of "dead samples" are temperature drop or improper sampling methods, which lead to solidification or sealing of the slurry. Incompletely reacted raw materials and uneven mixing are also factors that cause "dead samples". To avoid "dead samples", we use online sampling or rapid sampling equipment to reduce the generation of "dead samples", control the sampling temperature, maintain the temperature stability of the slurry during the sampling process to prevent solidification, and clean the sampler regularly to avoid residual contamination of the sampler.
[0004] Meanwhile, the slurry is collected by staff at regular intervals using carts and tools such as explosion-proof shovels, and then transported to a collection box. The slurry is then collected into ton bags by carts and stored at designated locations. This method of storing the slurry in the open air poses a risk of flash explosion due to the volatilization of ethane in the slurry. Utility Model Content
[0005] The purpose of this invention is to provide a high-efficiency polyethylene slurry recovery device for powder separation and ethane recovery during the polyethylene slurry sampling process, thereby improving the powder and ethane recovery rate and reducing energy consumption.
[0006] To achieve the above objectives, a high-efficiency polyethylene slurry recovery device is provided, comprising a slurry pump. The feed side of the slurry pump is connected to the polyethylene production end via a transmission pipeline, and the discharge side of the slurry pump is connected to the polyethylene slurry treatment process. The device is characterized in that a sampling pipeline is connected from the transmission pipeline to a sealed sampling box, and a plunger valve is arranged on the sampling pipeline. The sealed sampling box is connected to a collector via a discharge pipeline, and a needle valve is arranged on the discharge pipeline. The collector is connected to a slurry treatment tank via a collection pipeline, and a pneumatic solenoid valve is arranged on the collection pipeline.
[0007] Specifically: The slurry generated during the polystyrene production process is sent to the polyethylene slurry treatment process via a slurry pump. A sampling pipeline is led out from the feed pipeline at the slurry pump inlet. The slurry is fed into a sealed sampling box by opening or closing a plunger valve on the sampling pipeline. The sealed sampling box contains a sampler to achieve sealed sampling. The slurry is supplied to the collector through the discharge pipeline of the sealed sampling box. A needle valve on the discharge pipeline controls the delivery loop of the discharge pipeline. The collection pipeline of the collector is connected to the slurry treatment tank. After sampling, the slurry in the collector is sent to the slurry flushing pipeline treatment tank after sampling.
[0008] Furthermore: a flushing pipeline is connected to the discharge pipeline, and the flushing pipeline is connected to a flushing source from the outside.
[0009] Specifically: After sampling is completed, the plunger valve and needle valve are closed, and the slurry in the collector is flushed by nitrogen gas from the outside through the flushing pipeline to the slurry treatment tank.
[0010] Furthermore, a pressure detector is installed near the collector on the discharge pipeline.
[0011] Specifically: During nitrogen purging, pressure changes detected by a pressure detector are used to determine whether there is any blockage inside.
[0012] Beneficial effects: By using a special sealed sampler, external temperature changes can be avoided to prevent the slurry from solidifying and forming a "dead sample". The addition of collectors and slurry treatment tanks can prevent flash explosions that may occur when slurry is stored in the open.
[0013] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description
[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments;
[0015] Figure 1 This is a perspective view of a high-efficiency polyethylene slurry recycling device proposed in this utility model.
[0016] Legend:
[0017] 1. Slurry pump; 2. Delivery pipeline; 3. Sampling pipeline; 4. Sealed sampling box; 5. Plunger valve; 6. Discharge pipeline; 7. Collector; 8. Needle valve; 9. Collection pipeline; 10. Slurry treatment tank; 11. Pneumatic solenoid valve; 12. Flushing pipeline; 13. Pressure detector. Detailed Implementation
[0018] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.
[0019] Reference Figure 1 As shown in Embodiment 1 of this utility model, a high-efficiency polyethylene slurry recovery device includes a slurry pump 1. The feed side of the slurry pump 1 is connected to the polyethylene production end through a transmission pipeline 2, and the discharge side of the slurry pump 1 is connected to the polyethylene slurry treatment process. A sampling pipeline 3 is connected from the transmission pipeline 2 to a sealed sampling box 4. A plunger valve 5 is arranged on the sampling pipeline 3. The sealed sampling box 4 is connected to a collector 7 through a discharge pipeline 6. A needle valve 8 is arranged on the discharge pipeline 6. The collector 7 is connected to a slurry treatment tank 10 through a collection pipeline 9. A pneumatic solenoid valve 11 is arranged on the collection pipeline 9. A flushing pipeline 12 is connected to the discharge pipeline 6. The flushing pipeline 12 is connected to a flushing source from the outside. A pressure detector 13 is installed on the discharge pipeline 6 near the collector 7.
[0020] Working principle: Before sampling, ensure the slurry pump is running normally and the slurry flow is stable. Then, open the plunger valve 5 and needle valve 8. Fresh material in the transmission pipeline 2 enters the sampling pipeline 3 and carries the residual material through the sealed sampling box 4 and into the collector 7 through the discharge pipeline 6. After discharging the residual "dead sample" from each pipeline, close the plunger valve 5 and needle valve 8, open the pneumatic solenoid valve 11, and purge the flushing pipeline 12 with nitrogen from the outside. Purge the material in the collector 7 to the slurry treatment tank 10, where the material is cooked to recover ethane and wax. During the nitrogen purging process, the pressure rise trend detected by the pressure detector is used to determine whether there is a blockage.
[0021] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.
Claims
1. A high-efficiency polyethylene slurry recycling device, comprising a slurry pump (1), wherein the feed side of the slurry pump (1) is connected to the polyethylene production end via a transmission pipeline (2), and the discharge side of the slurry pump (1) is connected to the polyethylene slurry processing step, characterized in that, A sampling line (3) is connected from the transmission line (2) to the sealed sampling box (4). A plunger valve (5) is arranged on the sampling line (3). The sealed sampling box (4) is connected to the collector (7) through the discharge line (6). A needle valve (8) is arranged on the discharge line (6). The collector (7) is connected to the sludge treatment tank (10) through the collection line (9). A pneumatic solenoid valve (11) is arranged on the collection line (9).
2. The high-efficiency polyethylene slurry recovery device according to claim 1, characterized in that, A flushing pipeline (12) is connected to the discharge pipeline (6), and the flushing pipeline (12) is connected to a flushing source from the outside.
3. The high-efficiency polyethylene slurry recovery device according to claim 2, characterized in that, A pressure detector (13) is installed near the collector (7) on the discharge pipeline (6).