A cutting and desalting water circulation system

Abstract

This utility model discloses a pelletizing demineralized water circulation system, including a water tank, a plate heat exchanger, and a pelletizer. The outlet pipe of the water tank is connected to the inlet pipe of the plate heat exchanger. A water pump is installed on the connecting pipe between the water tank and the plate heat exchanger. The outlet pipe of the plate heat exchanger is connected to the inlet pipe of the pelletizer. A return pipe is installed at the outlet of the pelletizer, and the outlet of the return pipe is located above the water tank. A bypass pipe is installed in a short connection on the inlet and outlet pipes of the plate heat exchanger. The top of the water tank is open, and a steam pipe is laid on the bottom inner side of the water tank. This utility model improves the design of the plate heat exchanger pipeline and the water tank structure to meet the needs of hot alkaline cleaning. This utility model has the function of both production and cleaning, which can not delay the use of demineralized water for production during normal use, and can directly replace the hot alkaline solution to meet the system cleaning needs during cleaning.

Description

Technical Field

[0001] This utility model relates to the field of pelleting production technology, and more specifically, to a pelleting demineralized water circulation system. Background Technology

[0002] Demineralized water refers to water that has had almost all electrolyte ions (such as cations like calcium, magnesium, sodium, and iron, and anions like chloride, sulfate, and carbonate) removed through various water treatment processes. It has the characteristics of high purity and extremely low conductivity. Demineralized water is used in pelleting production systems as cooling water for recycling.

[0003] In actual production, it has been found that after prolonged operation of the demineralized water circulation system, scaling inside the pipes becomes increasingly severe. If left untreated, this will affect the normal operation of pelletizing production. The industry standard for cleaning the demineralized water circulation system is a combination of descaling agents and bactericides. However, in practice, this method has proven ineffective, especially in confined spaces and areas prone to scaling, such as flushing valves and overflow chambers. This makes thorough cleaning difficult, severely impacting the adjustment and precise control of the three water flow rates in the pelletizer, significantly affecting the equipment's pelletizing capacity. Currently, our company is attempting to use a more powerful hot alkaline solution to clean the demineralized water circulation system. However, using hot alkaline solutions can affect some equipment within the pelletizing system, and the demineralized water circulation system requires corresponding design modifications for the application of hot alkaline solutions. This case arises from this need. Utility Model Content

[0004] The purpose of this invention is to address the needs of the prior art by providing a pelletized demineralized water circulation system. This invention improves the design of the plate heat exchanger pipeline and water tank structure to meet the requirements of hot alkaline cleaning. This invention has the function of both production and cleaning, which can not delay the use of demineralized water for production, and can directly replace the system with hot alkaline solution to meet the system cleaning requirements during cleaning.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A pelletizing demineralized water circulation system includes a water tank, a plate heat exchanger, and a pelletizer. The outlet pipe of the water tank is connected to the inlet pipe of the plate heat exchanger. A water pump is installed on the connecting pipe between the water tank and the plate heat exchanger. The outlet pipe of the plate heat exchanger is connected to the inlet pipe of the pelletizer. A return pipeline is installed at the outlet of the pelletizer. The outlet of the return pipeline is located above the water tank. A bypass pipeline is installed in a short connection between the inlet and outlet pipes of the plate heat exchanger. The top of the water tank is open, and a steam pipe is laid on the bottom inner side of the water tank.

[0007] Furthermore, the plate heat exchanger is provided with a heat exchange inlet and a heat exchange outlet. The heat exchange inlet pipe is connected to a water pump, and the connection between the heat exchange inlet and the water pump is designated as a first pipeline. The heat exchange outlet pipe is connected to a pelletizer, and the connection between the heat exchange outlet and the pelletizer is designated as a second pipeline. The two ends of the bypass pipeline are respectively connected to the first pipeline and the second pipeline.

[0008] Furthermore, a third valve is installed on the avoidance pipeline, a first valve is installed on the heat exchange inlet, and a second valve is installed on the heat exchange outlet. The first and second valves open and close simultaneously, but the third valve cannot open and close simultaneously with the first and second valves.

[0009] Furthermore, a transmission belt is installed on the top of the water tank, the transmission belt is installed along the length of the water tank, a non-woven fabric roll is rotatably installed at one end of the length of the water tank, the non-woven fabric drawn from the non-woven fabric roll is laid on the belt surface of the transmission belt, and a fabric collection box is placed at the other end of the length of the water tank, the fabric collection box is located at the end point of the non-woven fabric movement.

[0010] Furthermore, the belt surface of the transmission belt is made of metal mesh.

[0011] Furthermore, the outlet of the return pipeline is provided with a return water outlet connector, which is fixedly installed above the belt surface of the transmission belt, with the water outlet facing downwards.

[0012] Furthermore, a demineralized water inlet pipe and an alkaline solution inlet pipe are installed on the side of the water tank, and the demineralized water inlet pipe and the alkaline solution inlet pipe are not opened at the same time.

[0013] The beneficial effects of this utility model are:

[0014] 1. This utility model features a specially designed short-circuit circuit on the inlet and outlet lines of the plate heat exchanger in the demineralized water circulation system. By opening the short-circuit circuit, the hot alkaline solution can be prevented from flowing through the plate heat exchanger, thereby eliminating its impact on the plate heat exchanger. This utility model also incorporates a heating and filtration drainage structure in the water tank to meet the usage requirements of hot alkaline solution cleaning.

[0015] 2. The water tank design of this utility model does not affect the normal production and use of demineralized water circulation. This utility model can not delay the use of demineralized water for production, and can directly replace the hot alkaline solution to meet the system cleaning requirements during cleaning. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structural principle of a pelletizing demineralized water circulation system in this embodiment;

[0017] Figure 2This is a schematic diagram of the water tank in this embodiment;

[0018] Figure 3 This is a photograph of the non-woven fabric laid on the surface of the transmission belt in this embodiment.

[0019] Reference numerals: 1. Water tank; 11. Steam pipe; 12. Transmission belt; 13. Non-woven fabric roll; 14. Fabric collection box; 15. Demineralized water inlet pipe; 16. Alkali inlet pipe; 2. Plate heat exchanger; 21. Heat exchange water inlet; 211. First valve; 22. Heat exchange water outlet; 221. Second valve; 3. Water pump; 31. First pipeline; 32. Second pipeline; 4. Pelletizer; 41. Return pipeline; 411. Return water outlet connector; 5. Avoidance pipeline; 51. Detailed Implementation

[0020] 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.

[0021] like Figures 1-3 The illustrated pelletizing demineralized water circulation system includes a water tank 1, a plate heat exchanger 2, and a pelletizer 4. The outlet pipe of the water tank 1 is connected to the inlet pipe of the plate heat exchanger 2. A water pump 3 is installed on the connecting pipe between the water tank 1 and the plate heat exchanger 2. The outlet pipe of the plate heat exchanger 2 is connected to the inlet pipe of the pelletizer 4. A return pipe 41 is installed at the outlet of the pelletizer 4, with its outlet located above the water tank 1. A bypass pipe 5 is short-connected to the inlet and outlet pipes of the plate heat exchanger 2. The top of the water tank 1 is open, and a steam pipe 11 is laid on the inner bottom of the water tank 1. When this system is normally used for pelletizing production, the water tank 1 contains treated demineralized water. Figure 1As shown, water pump 3 pumps water and materials. Demineralized water is drawn from water tank 1 to plate heat exchanger 2 via water pump 3. Plate heat exchanger 2 creates a heat exchange and cooling effect for the water. The cooled water is output from plate heat exchanger 2 to pelletizer 4 as cooling water during pelletizing. The water used in the pelletizing operation flows back to water tank 1 through return pipeline 41 to form a cycle, hence the name demineralized water circulation system. During normal operation, avoidance pipeline 5 and steam pipeline 11 are closed and ineffective. When scaling seriously affects production, system cleaning is required (the scale in the pipeline mainly consists of some bacteria and electrolyte ions left over from various water treatment processes, which gradually accumulate over a long period of time). Cleaning is done with hot alkaline solution (the main component is sodium hydroxide, and the concentration is generally 2%). 0.5-3%, temperature 65-80 degrees Celsius). Before cleaning, the water in the water tank 1 is changed. The demineralized water is drained through the drain outlet at the bottom of the water tank 1 and replaced with alkaline solution. Since the alkaline solution needs to be heated, the steam pipe 11 in the water tank 1 needs to be opened to heat the alkaline solution. Since hot alkaline solution will damage the plate heat exchanger 2, this utility model is designed to open the avoidance pipe 5 to prevent the hot alkaline solution from flowing through the plate heat exchanger 2 (the plate heat exchanger 2 itself can be cleaned by disassembly). In order to cooperate with the hot alkaline solution cleaning, the cast aluminum quick connectors used in the existing system are all replaced with stainless steel quick connectors. With the above design, this utility model can not delay the use of demineralized water for production, and can directly replace the hot alkaline solution to meet the system cleaning requirements during cleaning.

[0022] like Figure 1As shown, the plate heat exchanger 2 is provided with a heat exchange inlet port 21 and a heat exchange outlet port 22. The heat exchange inlet port 21 is connected to the water pump 3, and the connection between the heat exchange inlet port 21 and the water pump 3 is designated as the first pipeline 31. The heat exchange outlet port 22 is connected to the pelletizer 4, and the connection between the heat exchange outlet port 22 and the pelletizer 4 is designated as the second pipeline 32. The two ends of the bypass pipeline 5 are respectively connected to the first pipeline 31 and the second pipeline 32, and the bypass pipeline 5 forms a short connection between the first pipeline 31 and the second pipeline 32. In this utility model, a third valve 51 is installed on the bypass pipeline 5, a first valve 211 is installed on the heat exchange inlet port 21, and a second valve 221 is installed on the heat exchange outlet port 22. The first valve 211 and the third valve 51 are connected to the second pipeline 32. Two valves 221 open and close simultaneously. The third valve 51 cannot open and close simultaneously with the first valve 211 and the second valve 221. When using demineralized water for production, the first valve 211 and the second valve 221 open simultaneously, while the third valve 51 closes. In other words, the bypass pipeline 5 is ineffective, and the demineralized water flows through the plate heat exchanger 2 for normal heat exchange and cooling. When using the hot alkaline cleaning system, the first valve 211 and the second valve 221 close simultaneously, while the third valve 51 opens. In other words, the bypass pipeline 5 is effective, and the hot alkaline solution passes through the bypass pipeline 5 without entering the plate heat exchanger 2. This protects the plate heat exchanger 2 from damage. The design of the bypass pipeline 5 is simple and practical, providing a guarantee for the use of the hot alkaline cleaning system.

[0023] During the cleaning system management process, a large amount of dirt is flushed out. If this dirt is directly discharged into water tank 1, it will be difficult to retrieve and clean. Therefore, if... Figure 2 As shown, this utility model has a transmission belt 12 installed on the top of the water tank 1. The transmission belt 12 is installed along the length of the water tank 1, and the conveying direction of the belt surface of the transmission belt 12 is along... Figure 2 As indicated by the arrow, a non-woven fabric roll 13 is rotatably mounted at one end of the length of the water tank 1. Figure 2 On the left side of the water tank 1, the non-woven fabric drawn from the non-woven fabric roll 13 is laid on the belt surface of the transmission belt 12, and a fabric collection box 14 is placed at the other end of the length direction of the water tank 1. Figure 2 (On the right side of water tank 1), the fabric collection box 14 is located at the end point of the nonwoven fabric's movement. The transmission belt 12 drives the nonwoven fabric to move. The nonwoven fabric eventually detaches from the transmission belt 12 and falls into the fabric collection box 14 for storage. Figure 3As shown, the belt surface of the transmission belt 12 is made of metal mesh to ensure that it does not impede the passage of water and can also drive the non-woven fabric forward by friction. The non-woven fabric in the water tank 1 serves to filter dirt and impurities in the water (the small mesh of the non-woven fabric does not impede the passage of water but can still trap dirt and impurities). Therefore, this invention provides a return water outlet connector 411 at the outlet of the return pipeline 41. The return water outlet connector 411 is fixedly installed above the belt surface of the transmission belt 12, with the outlet facing downwards. The hot alkaline solution sprayed from the return water outlet connector 411 falls... After impurities and dirt are trapped on the non-woven fabric, it does not affect the return of hot alkaline solution to the water tank 1. The drive belt 12 needs to be started and run once every once in a while (usually every 10-15 minutes during cleaning operations, which can be monitored by installing vision equipment). Each stroke is about one-quarter of the length of the water tank 1, ensuring that there is a clean non-woven fabric surface directly below the return water outlet 411. The dirty cloth falls and is collected in the cloth collection box 14. The design of the drive belt 12 is not affected when the demineralized water is used, and it can also trap impurities in the returned demineralized water through the non-woven fabric, so that the scaling cycle of the system can be effectively extended.

[0024] like Figure 1 As shown, a demineralized water inlet pipe 15 and an alkali inlet pipe 16 are installed on the side of the water tank 1. The demineralized water inlet pipe 15 is used to input demineralized water, and the alkali inlet pipe 16 is used to input alkali. The demineralized water inlet pipe 15 and the alkali inlet pipe 16 are not opened at the same time to avoid mixing accidents. The bottom of the water tank 1 is provided with a water outlet and a drain outlet.

[0025] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A pelletizing demineralized water circulation system, characterized in that, The device includes a water tank (1), a plate heat exchanger (2), and a pelletizer (4). The outlet pipe of the water tank (1) is connected to the inlet of the plate heat exchanger (2). A water pump (3) is installed on the connecting pipe between the water tank (1) and the plate heat exchanger (2). The outlet pipe of the plate heat exchanger (2) is connected to the inlet of the pelletizer (4). A return line (41) is installed at the outlet of the pelletizer (4). The outlet of the return line (41) is located above the water tank (1). A bypass line (5) is installed shortly on the inlet and outlet pipes of the plate heat exchanger (2). The top of the water tank (1) is open. A steam pipe (11) is laid on the bottom inner side of the water tank (1).

2. The pelletizing demineralized water circulation system according to claim 1, characterized in that, The plate heat exchanger (2) is provided with a heat exchange inlet water interface (21) and a heat exchange outlet water interface (22). The heat exchange inlet water interface (21) is connected to a water pump (3). The connection between the heat exchange inlet water interface (21) and the water pump (3) is set as a first pipeline (31). The heat exchange outlet water interface (22) is connected to a pelletizer (4). The connection between the heat exchange outlet water interface (22) and the pelletizer (4) is set as a second pipeline (32). The two ends of the bypass pipeline (5) are respectively connected to the first pipeline (31) and the second pipeline (32).

3. The pelletizing demineralized water circulation system according to claim 2, characterized in that, A third valve (51) is installed on the avoidance pipeline (5), a first valve (211) is installed on the heat exchange inlet (21), and a second valve (221) is installed on the heat exchange outlet (22). The first valve (211) and the second valve (221) are opened and closed simultaneously. The third valve (51) cannot be opened and closed simultaneously with the first valve (211) and the second valve (221).

4. The pelletizing demineralized water circulation system according to claim 1, characterized in that, A transmission belt (12) is installed on the top of the water tank (1). The transmission belt (12) is installed along the length of the water tank (1). A non-woven fabric roll (13) is rotatably installed at one end of the length of the water tank (1). The non-woven fabric drawn from the non-woven fabric roll (13) is laid on the belt surface of the transmission belt (12). A fabric collection box (14) is placed at the other end of the length of the water tank (1). The fabric collection box (14) is located at the end point of the non-woven fabric movement.

5. The pelletizing demineralized water circulation system according to claim 4, characterized in that, The belt surface of the transmission belt (12) is made of metal mesh.

6. The pelletizing demineralized water circulation system according to claim 4, characterized in that, The outlet of the return pipeline (41) is provided with a return water outlet connector (411). The return water outlet connector (411) is fixedly installed above the belt surface of the transmission belt (12). The return water outlet connector (411) is installed with the water outlet facing downwards.

7. The pelletizing demineralized water circulation system according to claim 1, characterized in that, The water tank (1) is equipped with a demineralized water inlet pipe (15) and an alkaline solution inlet pipe (16) on its side. The demineralized water inlet pipe (15) and the alkaline solution inlet pipe (16) are not opened at the same time.

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