Pigment red 254 rake dryer mechanical seal cooling system

Abstract

The utility model relates to the technical field of pigment red preparation, and discloses a pigment red 254 rake dryer mechanical seal cooling system which comprises a storage tank, an inlet of the storage tank is fixedly connected with a cooling medium inlet pipe valve, and an outlet of the storage tank is respectively connected with a circulating pump B and a circulating pump A through a three-way pipe. An outlet of the circulating pump B and an outlet of the circulating pump A are connected to an inlet of a heat exchanger through a three-way pipe, an outlet of the heat exchanger is connected to a stirring mechanical sealing mechanism through a pipeline, and the stirring mechanical sealing mechanism is connected with a rotating shaft of the rake dryer in a sealed mode. By optimizing a cooling medium and adopting an efficient heat exchanger, a double-pump parallel design and an intelligent temperature control system, the cooling problem of the mechanical seal of the pigment red 254 rake dryer in a high-temperature environment is effectively solved, the stability and reliability of equipment are improved, the service life of the mechanical seal is prolonged, and the service life of the mechanical seal is prolonged. And a powerful guarantee is provided for high-quality production of the pigment red 254.

Description

Pigment Red 254 Rake Dryer Mechanical Seal Cooling System Technical Field

[0001] This utility model relates to the field of pigment red preparation technology, and in particular to the mechanical seal cooling system of the pigment red 254 rake dryer. Background Technology

[0002] Pigment red is a broad term encompassing a large class of organic and inorganic pigments used to provide red hues, with wide applications in various fields. Organic pigment reds are typically organic compounds containing heteroatoms such as nitrogen, sulfur, and oxygen. They are characterized by diverse molecular structures, vibrant colors, high tinting strength, and good transparency. Common varieties include Permanent Red F3RK and Lithol Red. Inorganic pigment reds mainly include some metal oxides or salts, such as iron oxide red. They possess good lightfastness, heat resistance, and chemical stability, but their colors are relatively less vibrant, and their tinting strength is also lower. In industries such as plastics, rubber, coatings, inks, and textile printing and dyeing, pigment reds are used to color products to meet different visual and performance requirements. Drying is necessary during the production and preparation of pigment reds because they often contain a large amount of moisture, the presence of which significantly affects their quality and performance. On the one hand, moisture reduces the purity of pigment red. Moisture may contain impurities that, as the moisture evaporates, remain in the pigment, affecting its quality. On the other hand, the presence of moisture causes pigment red particles to agglomerate, leading to poor dispersibility and affecting its uniform distribution in the application system, thus impacting the color and performance of the final product. Furthermore, during storage and transportation, pigment red in a moist state is prone to microbial growth, causing deterioration. Dried pigment red, however, has a longer shelf life and maintains its quality stability. Moreover, in some subsequent processing steps, such as the mixing of plastics or rubber, if the pigment red contains moisture, the evaporation of this moisture during high-temperature processing will generate bubbles, affecting the product's appearance and physical properties.

[0003] In the production process of Pigment Red 254, when under dry conditions and at temperatures exceeding 160°C, the normal operation of the mechanical seals faces significant challenges. To ensure their stability and reliability in high-temperature environments, water-based coolants are essential. Traditionally, the factory's circulating cooling water, typically ordinary tap water, is used. However, at temperatures exceeding 160°C, if the cooling water flow is too slow or interrupted, the tap water used for cooling will evaporate instantly. With rapid evaporation, inorganic salts such as calcium and magnesium in the tap water gradually precipitate and adsorb onto the inner wall of the mechanical seal. This continuous accumulation of inorganic salts severely affects the heat exchange efficiency of the mechanical seal, preventing heat from dissipating effectively and leading to localized overheating. More seriously, the continuous adsorption of inorganic salts can also cause blockages in pipes or channels, preventing the cooling system from functioning properly and potentially damaging the mechanical seal. This can malfunction the entire production equipment, impacting the production schedule and quality of Pigment Red 254.

[0004] Therefore, those skilled in the art have provided a mechanical seal cooling system for the Pigment Red 254 rake dryer to solve the problems mentioned in the background art. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a mechanical seal cooling system for the Pigment Red 254 rake dryer. This system utilizes a circulating cooling pipeline to cool the stirring mechanical seal mechanism, thereby increasing its service life and heat dissipation efficiency.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a mechanical seal cooling system for a Pigment Red 254 rake dryer, comprising a storage tank, wherein a cooling medium inlet valve is fixedly connected to the inlet of the storage tank, and a circulation pump B and a circulation pump A are respectively connected to the outlet of the storage tank via a three-way pipe. The outlets of circulation pump B and circulation pump A are connected to the inlet of a heat exchanger via a three-way pipe, and the outlet of the heat exchanger is connected to a stirring mechanical seal mechanism via a pipeline. The stirring mechanical seal mechanism is sealed to the rotating shaft of the rake dryer, and the outlet of the rake dryer is connected to the return port of the storage tank.

[0007] Furthermore, the cooling medium injected into the cooling medium inlet valve is deionized water or heat transfer oil; the cooling water inlet of the heat exchanger is connected to the circulating cooling water inlet pipe, and the cooling water outlet is connected to the circulating cooling water return pipe. The circulating cooling water inlet pipe and the circulating cooling water return pipe are connected to a compressor refrigeration unit or a semiconductor refrigeration unit.

[0008] Furthermore, the storage tank is equipped with a liquid level sensor and a temperature sensor, the outer wall of the storage tank is provided with a heat insulation layer, and the top is provided with an exhaust valve.

[0009] Furthermore, the circulating pump A and circulating pump B are connected in parallel and both are equipped with pressure regulating valves, and the drive motors of the circulating pump A and circulating pump B are equipped with frequency converters.

[0010] Furthermore, the heat exchanger is a plate heat exchanger or a spiral tube heat exchanger, and the cooling medium channel of the heat exchanger is provided with a turbulence enhancement structure.

[0011] Furthermore, the stirring mechanical seal mechanism adopts a double-end mechanical seal structure, and a spring compensation device is provided in the sealing chamber. The sealing surface material is silicon carbide or hard alloy.

[0012] Furthermore, a temperature feedback control system is provided between the sealed cavity and the heat exchanger of the rake dryer, including a PID controller and an electric regulating valve, to realize closed-loop temperature control of the sealed cooling medium.

[0013] This utility model has the following beneficial effects:

[0014] The mechanical seal cooling system for the Pigment Red 254 rake dryer proposed in this utility model uses deionized water or heat transfer oil as the cooling medium, avoiding the blockage or damage to the mechanical seal caused by the evaporation and precipitation of inorganic salts from traditional tap water. This significantly improves the cooling effect and system stability. The system is equipped with a high-efficiency heat exchanger, adopting a plate or spiral tube structure with a turbulence enhancement design to ensure sufficient heat exchange. At the same time, a closed-loop temperature control system achieves precise temperature regulation, ensuring reliable operation of the mechanical seal in high-temperature environments. The indirect heat exchange design prevents circulating water from directly contacting the mechanical seal, eliminating the problem of salt deposition caused by instantaneous water vaporization and extending the service life of the equipment. Attached Figure Description

[0015] Figure 1 is a schematic diagram of the system structure of this utility model.

[0016] Legend:

[0017] 1. Rake dryer; 2. Stirring mechanical seal mechanism; 3. Circulating cooling water return pipe; 4. Heat exchanger; 5. Circulating cooling water inlet pipe; 6. Circulating pump B; 7. Circulating pump A; 8. Storage tank; 9. Cooling medium inlet valve. 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] Referring to Figure 1, one embodiment of this utility model provides a mechanical seal cooling system for a Pigment Red 254 rake dryer, including a storage tank 8. A cooling medium inlet valve 9 is fixedly connected to the inlet of the storage tank 8. The outlet of the storage tank 8 is connected to a circulation pump B6 and a circulation pump A7 via a three-way pipe. The outlets of the circulation pumps B6 and A7 are connected to the inlet of a heat exchanger 4 via a three-way pipe. The outlet of the heat exchanger 4 is connected to a stirring mechanical seal mechanism 2 via a pipeline. The stirring mechanical seal mechanism 2 is sealed to the rotating shaft of the rake dryer 1. The outlet of the rake dryer 1 is connected to the return port of the storage tank 8.

[0020] The cooling medium injected into the cooling medium inlet valve 9 is deionized water or heat transfer oil. The cooling water inlet of the heat exchanger 4 is connected to the circulating cooling water inlet pipe 5, and the cooling water outlet is connected to the circulating cooling water return pipe 3. The circulating cooling water inlet pipe 5 and the circulating cooling water return pipe 3 are connected to a compressor refrigeration unit or a semiconductor refrigerator. The storage tank 8 is equipped with a liquid level sensor and a temperature sensor. The outer wall of the storage tank 8 is equipped with a heat insulation layer, and the top is equipped with an exhaust valve. Circulating pumps A7 and B6 are connected in parallel and are both equipped with pressure regulating valves. The drive motors of circulating pumps A7 and B6 are equipped with frequency converters. The heat exchanger 4 is a plate heat exchanger 4 or a spiral tube heat exchanger 4. The cooling medium channel of the heat exchanger 4 is equipped with a turbulence enhancement structure. The stirring mechanical seal mechanism 2 adopts a double-end mechanical seal structure. The sealing chamber is equipped with a spring compensation device, and the sealing surface material is silicon carbide or hard alloy. A temperature feedback control system is provided between the sealing chamber of the rake dryer 1 and the heat exchanger 4, including a PID controller and an electric regulating valve, to realize closed-loop temperature control of the sealed cooling medium. The system is equipped with safety protection devices, including pressure sensors and flow sensors installed on the outlet pipeline of the circulating pump, as well as an audible and visual alarm connected to the control system. The stirring mechanical seal mechanism 2 is equipped with a cooling chamber. Ionized water or heat transfer oil enters its interior for cooling and then flows back to the storage tank 8. Indirect heat exchange is used. The factory's circulating water will not directly enter the stirring mechanical seal mechanism 2. Therefore, in the event of a failure, the water will not instantly vaporize, and calcium, magnesium and other salts will not adhere to the mechanical seal.

[0021] Specifically, the system uses deionized water or heat transfer oil as the cooling medium (injected through cooling medium inlet valve 9). Compared to traditional tap water, deionized water does not precipitate inorganic salts such as calcium and magnesium due to evaporation, while heat transfer oil has a higher boiling point and thermal stability, maintaining a stable cooling effect in high-temperature environments. The heat exchanger 4 adopts a plate or spiral tube structure and is equipped with a turbulence enhancement structure, which significantly improves heat exchange efficiency, ensuring sufficient heat exchange between the cooling medium and the circulating cooling water, and preventing damage to the mechanical seal due to overheating. A temperature feedback control system, including a PID controller and an electric regulating valve, is installed between the sealing chamber of the rake dryer 1 and the heat exchanger 4, enabling closed-loop temperature control of the sealing cooling medium and ensuring that the mechanical seal is always within a suitable temperature range.

[0022] Circulating pumps A7 and B6 are connected in parallel, both equipped with pressure regulating valves and frequency converters, allowing for flexible adjustment of the cooling medium flow and pressure according to system requirements. If one pump fails, the other can continue operating, ensuring continuous operation of the cooling system and preventing overheating of the mechanical seal due to flow interruption. The system has pressure and flow sensors on the circulating pump outlet pipes to monitor the cooling medium flow in real time. In case of any abnormality (such as low pressure or insufficient flow), the control system will immediately issue an audible and visual alarm to alert operators for timely intervention.

[0023] The cooling medium (deionized water or heat transfer oil) is cooled within the agitator mechanical seal mechanism 2 and then flows back to the storage tank 8, employing an indirect heat exchange method. The factory's circulating water does not directly enter the agitator mechanical seal mechanism 2. Even if the cooling system malfunctions, the instantaneous vaporization of water will prevent calcium, magnesium, and other salts from adhering to the inner wall of the mechanical seal, ensuring long-term stable operation of the mechanical seal. The agitator mechanical seal mechanism 2 adopts a double-end face mechanical seal structure, with a spring compensation device inside the sealing chamber. The sealing surface material is silicon carbide or hard alloy, possessing extremely high wear resistance and high-temperature resistance, effectively preventing leakage and wear, and extending the service life of the mechanical seal. The cooling water inlet of the heat exchanger 4 is connected to the circulating cooling water inlet pipe 5, and the cooling water outlet is connected to the circulating cooling water return pipe 3. The system uses a compressor refrigeration unit or a semiconductor refrigerator, allowing for flexible adjustment of the cooling water temperature according to actual needs, reducing energy consumption and achieving energy conservation and emission reduction.

[0024] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. 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 mechanical seal cooling system for a Pigment Red 254 rake dryer, comprising a storage tank (8), characterized in that: The inlet of the storage tank (8) is fixedly connected to a cooling medium inlet valve (9). The outlet of the storage tank (8) is connected to a circulation pump B (6) and a circulation pump A (7) through a three-way pipe. The outlets of the circulation pump B (6) and the circulation pump A (7) are connected to the inlet of the heat exchanger (4) through a three-way pipe. The outlet of the heat exchanger (4) is connected to the stirring mechanical seal mechanism (2) through a pipeline. The stirring mechanical seal mechanism (2) is sealed to the rotating shaft of the rake dryer (1). The outlet of the rake dryer (1) is connected to the return port of the storage tank (8).

2. The mechanical seal cooling system for the Pigment Red 254 rake dryer according to claim 1, characterized in that: The cooling medium injected into the cooling medium inlet valve (9) is deionized water or heat transfer oil; the cooling water inlet of the heat exchanger (4) is connected to the circulating cooling water inlet pipe (5), and the cooling water outlet is connected to the circulating cooling water return pipe (3). The circulating cooling water inlet pipe (5) and the circulating cooling water return pipe (3) are connected to a compressor refrigeration unit or a semiconductor refrigeration unit.

3. The Pigment Red 254 rake dryer mechanical seal cooling system of claim 1, wherein: The storage tank (8) is equipped with a liquid level sensor and a temperature sensor. The outer wall of the storage tank (8) is provided with a heat insulation layer, and the top is provided with an exhaust valve.

4. The Pigment Red 254 rake dryer mechanical seal cooling system of claim 1, wherein: The circulating pump A (7) and circulating pump B (6) are connected in parallel and are both equipped with pressure regulating valves. The drive motors of the circulating pump A (7) and circulating pump B (6) are equipped with frequency converters.

5. The mechanical seal cooling system for the Pigment Red 254 rake dryer according to claim 1, characterized in that: The heat exchanger (4) is a plate heat exchanger or a spiral tube heat exchanger, and the cooling medium channel of the heat exchanger (4) is provided with a turbulence enhancement structure.

6. The mechanical seal cooling system for the Pigment Red 254 rake dryer according to claim 1, characterized in that: The stirring mechanical seal mechanism (2) adopts a double-end mechanical seal structure, and a spring compensation device is provided in the sealing chamber. The sealing surface material is silicon carbide or hard alloy.

7. The Pigment Red 254 rake dryer mechanical seal cooling system of claim 1, wherein: The rake dryer (1) is equipped with a temperature feedback control system between the sealed cavity and the heat exchanger (4), which includes a PID controller and an electric regulating valve to realize closed-loop temperature control of the sealed cooling medium.

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