Granular water circulation system

Abstract

The utility model discloses a kind of granular water circulation systems, it includes powder filter, alkali tank, granular water tank, water quality monitor;The granular water inlet of powder filter is connected with granular water pipeline, the clean liquid outlet of powder filter is connected with granular water tank by liquid discharge pipeline, the backwash inlet of powder filter is connected with backwash pipeline, the blowdown of powder filter is connected with recovery tank by discharge pipeline;The outlet of alkali tank is connected with the inlet pipeline of granular water tank by first regulating valve, the overflow of granular water tank is communicated with discharge pipeline by overflow pipeline, overflow pipeline is equipped with water quality monitor, the water outlet of granular water tank is connected with the inlet pipeline of pelletizing water chamber by circulating pump.

Description

Technical Field

[0001] This utility model relates to the field of polypropylene production, specifically to a particulate water circulation system. Background Technology

[0002] The polypropylene production process involves weighing polypropylene powder and additives, mixing them online, and then adding them to an extruder. The product is heated, melted, and homogenized in the cylinder, then extruded into strands through the die holes and sent to the pelletizing water chamber. The pelletizing water chamber includes a die and a cutter. The die has 1800 die holes. Polypropylene resin at around 230°C passes through the die holes and is then pelletized by the cutter. After the pellets are cooled to 50-60°C in the pellet water, they are carried away by the pellet water and sent to a dryer for water and pellet separation. The polypropylene pellets are then dried, screened, and sent to the finished pellet silo.

[0003] The template and cutter in the pelletizing water chamber operate in the pelletized water for a long time. Because the additives added to the polypropylene are acidic, the pelletized water becomes acidic. Under this environment, the template surface will be slightly corroded during long-term operation, which will affect the adhesion between the template and the cutter and cause wear on the template and the cutter. During water and pellet separation, polypropylene powder is mixed in the pelletized water. Direct recycling will cause blockage of the subsequent production pipeline and affect production. Utility Model Content

[0004] The purpose of this invention is to provide a particulate water circulation system.

[0005] This utility model is implemented by the following technical solution: a granular water circulation system, which includes a powder filter, an alkali addition tank, a granular water tank, and a water quality monitoring instrument;

[0006] The particulate water inlet of the powder filter is connected to the particulate water pipeline, the clean liquid outlet of the powder filter is connected to the particulate water tank through the drain pipeline, the backwash inlet of the powder filter is connected to the backwash pipeline, and the sewage outlet of the powder filter is connected to the recovery tank through the discharge pipeline.

[0007] The outlet of the alkali addition tank is connected to the inlet pipeline of the pellet water tank through a first regulating valve. The overflow port of the pellet water tank is connected to the discharge pipeline through an overflow pipeline. The overflow pipeline is equipped with a water quality monitor. The outlet of the pellet water tank is connected to the inlet pipeline of the pelletizing water chamber through a circulating pump.

[0008] Furthermore, the top of the granular water tank is provided with a water supply pipeline, the outlet of which is located inside the granular water tank. The water supply pipeline is equipped with a second regulating valve, and a level gauge is installed in the granular water tank.

[0009] Furthermore, a steam pipeline is provided on the top of the granular water tank, the outlet of the steam pipeline is located inside the granular water tank, the steam pipeline is equipped with a third regulating valve, and a temperature sensor is provided in the granular water tank.

[0010] Furthermore, it also includes a controller, the input terminals of which are electrically connected to the water quality monitor, the level gauge, and the temperature sensor, respectively, and the output terminals of which are electrically connected to the circulating pump, the first regulating valve, the second regulating valve, and the third regulating valve, respectively.

[0011] The advantages of this invention are: the water quality in the granulation tank is adjusted to the required alkalinity by the granulation tank, water quality monitor, and alkali addition tank, thus reducing corrosion to the template surface, extending the service life of the template and cutter, and reducing wear; during water-granule separation, polypropylene powder is mixed in the granulation water, and the polypropylene powder mixed in the granulation water floats to the surface and is recovered into the recovery tank by the overflow port;

[0012] Polypropylene powder and particulate water are filtered by a powder filter and then recycled to a recovery tank via a discharge pipeline, which reduces the waste of polypropylene powder and ensures the smooth flow of materials in the subsequent production pipeline. Particulate water is recycled to a particulate water tank for easy reuse and reduces waste of particulate water.

[0013] Intelligent monitoring was achieved through the use of water supply pipelines, level gauges, steam pipelines, temperature sensors, and controllers, effectively ensuring the circulation and utilization of particulate water. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a process flow diagram of the present invention;

[0016] Figure 2 This is a control principle diagram of the utility model;

[0017] In the diagram: 1. Powder filter; 2. Granular water pipeline; 3. Drainage pipeline; 4. Granular water tank; 5. Backwash pipeline; 6. Discharge pipeline; 7. Recovery tank; 8. Alkali addition tank; 10. First regulating valve; 11. Overflow pipeline; 12. Water quality monitor; 13. Circulating pump; 14. Pelletizing water chamber; 15. Water replenishment pipeline; 16. Second regulating valve; 17. Level gauge; 18. Steam pipeline; 19. Third regulating valve; 20. Temperature sensor; 21. Controller. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] like Figure 1-2 As shown, the granular water circulation system includes a powder filter 1, an alkali addition tank 8, a granular water tank 4, and a water quality monitoring instrument 12.

[0020] The granular water inlet of powder filter 1 is connected to granular water pipeline 2, the clean liquid outlet of powder filter 1 is connected to granular water tank 4 through drain pipeline 3, the backwash inlet of powder filter 1 is connected to backwash pipeline 5, and the sewage outlet of powder filter 1 is connected to recovery tank 7 through discharge pipeline 6. The polypropylene powder filtered by powder filter 1 is recovered into recovery tank 7 through discharge pipeline 6, reducing material waste.

[0021] The outlet of the alkali addition tank 8 is connected to the inlet pipeline of the pellet water tank 4 through the first regulating valve 10. The overflow port of the pellet water tank 4 is connected to the discharge pipeline 6 through the overflow pipeline 11. The overflow pipeline 11 is equipped with a water quality monitor 12. The outlet of the pellet water tank 4 is connected to the inlet pipeline of the pelletizing water chamber 14 through the circulating pump 13.

[0022] The top of the granular water tank 4 is equipped with a water supply line 15. The outlet of the water supply line 15 is located inside the granular water tank 4. The water supply line 15 is equipped with a second regulating valve 16. The granular water tank 4 is equipped with a level gauge 17. The water in the water supply line 15 comes from the tap water in the factory area.

[0023] A steam pipeline 18 is installed on the top of the granular water tank 4. The outlet of the steam pipeline 18 is located inside the granular water tank 4. The steam pipeline 18 is equipped with a third regulating valve 19. A temperature sensor 20 is installed in the granular water tank 4. The source of the steam pipeline 18 is the steam source of the plant area.

[0024] It also includes a controller 21. The input terminals of the controller 21 are electrically connected to the water quality monitor 12, the level gauge 17 and the temperature sensor 20, respectively, mainly to display the specific data detected. The output terminals of the controller 21 are electrically connected to the circulating pump 13, the first regulating valve 10, the second regulating valve 16 and the third regulating valve 19, respectively, and the output terminals are controlled by various relays in the electrical control cabinet.

[0025] The specific operation process of this embodiment is as follows:

[0026] Polypropylene resin at around 230°C is granulated by a cutter after passing through the die of an extruder. After being cooled to 50-60°C by granule water, it is transported to a dryer. After water and granule separation, the granule water mixed with polypropylene powder is sent to powder filter 1. After passing through powder filter 1, the polypropylene powder and granule water are separated. The granule water is sent to granule water tank 4 through drain line 3 for recycling. The powder is sent to recovery tank 7 through discharge line 6 under the action of backwash water for subsequent recovery of polypropylene powder.

[0027] The pH of the granulated water is detected by the water quality monitor 12 on the overflow pipeline 11 in the granulated water tank 4. When the water quality in the granulated water tank 4 does not meet the process requirements, the first regulating valve 10 is used to send the alkaline solution to the granulated water tank 4 through the alkali tank 8 to adjust the pH of the granulated water. The pH of the granulated water is controlled within a certain alkaline range, with a control value of 9-10. This can reduce the corrosion of the template and cutter by the granulated water and extend their service life.

[0028] The water level is monitored in real time using the level gauge 17 of the granular water tank 4. When the water level drops to the lowest value, the second regulating valve 16 is opened, and water is replenished to the granular water tank 4 through the water replenishment pipeline 15.

[0029] When the machine is running, the temperature of the pellet water is too low, which will cause the front die holes to become clogged, resulting in uneven pellet size. Therefore, a steam pipeline 18 is installed at the top of the pellet water tank 4. The pellet water in the pellet water tank 4 is heated by the steam pipeline 18 through the adjustment of the third regulating valve 19. Under the detection of the temperature sensor 20, the pellet water is kept at a temperature of 50-60 degrees Celsius. When the pellets come in later, the temperature of the pellets is high, so it is no longer necessary to heat the pellet water in the pellet water tank 4.

[0030] An overflow port is provided at the top of the pellet water tank 4. A small amount of polypropylene powder in the pellet water tank 4 will be suspended on the liquid surface and flow into the recovery tank 7 through the overflow port. The outlet of the pellet water tank 4 is connected to the inlet pipeline of the pelletizing water chamber 14 through the circulation pump 13.

[0031] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A particulate water circulation system, characterized in that, It includes a powder filter, an alkali addition tank, a granular water tank, and a water quality monitoring instrument; The particulate water inlet of the powder filter is connected to the particulate water pipeline, the clean liquid outlet of the powder filter is connected to the particulate water tank through the drain pipeline, the backwash inlet of the powder filter is connected to the backwash pipeline, and the sewage outlet of the powder filter is connected to the recovery tank through the discharge pipeline. The outlet of the alkali addition tank is connected to the inlet pipeline of the pellet water tank through a first regulating valve. The overflow port of the pellet water tank is connected to the discharge pipeline through an overflow pipeline. The overflow pipeline is equipped with a water quality monitor. The outlet of the pellet water tank is connected to the inlet pipeline of the pelletizing water chamber through a circulating pump.

2. The particulate water circulation system according to claim 1, characterized in that, The top of the granular water tank is equipped with a water supply pipeline, the outlet of which is located inside the granular water tank. The water supply pipeline is equipped with a second regulating valve, and a level gauge is installed in the granular water tank.

3. The particulate water circulation system according to claim 2, characterized in that, A steam pipeline is installed on the top of the granular water tank, and the outlet of the steam pipeline is located inside the granular water tank. The steam pipeline is equipped with a third regulating valve, and a temperature sensor is installed in the granular water tank.

4. The particulate water circulation system according to claim 3, characterized in that, It also includes a controller, the input terminals of which are electrically connected to the water quality monitor, the level gauge and the temperature sensor, respectively, and the output terminals of which are electrically connected to the circulating pump, the first regulating valve, the second regulating valve and the third regulating valve, respectively.

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