Sealing structure of chlorinated paraffin reaction kettle

Abstract

The utility model relates to a chlorinated paraffin reaction kettle sealing structure which comprises a mounting seat, a mounting hole is formed in the bottom surface of the mounting seat, a first sealing surface is arranged on the lower section of the inner side wall of the mounting hole, a second sealing surface is arranged on the upper section of the inner side wall of the mounting hole, and a heating structure is arranged on the mounting seat and used for heating the first sealing surface and maintaining the temperature of the first sealing surface to be higher than a material crystallization point. Cooling crystallization is prevented when a high-temperature molten material is in contact with the sealing surface, so that the sealing effect is ensured, and the operation stability and safety of the sealing part of the reaction kettle are improved. The technical problems that in the prior art, due to cooling crystallization of high-temperature molten materials at the mechanical sealing position, sealing failure is caused, the maintenance cost is increased, and potential environmental pollution and potential safety hazards are caused are solved.

Description

Technical Field

[0001] This utility model relates to a sealing structure for a chlorinated paraffin reaction vessel. Background Technology

[0002] Chlorinated paraffin is an important chemical product widely used in plasticizers, lubricant additives, flame retardants, and other fields. The production of chlorinated paraffin typically employs a batch reactor, where the chlorination reaction takes place under high-temperature conditions. Specifically, during production, the reactor must be maintained at a high temperature of 150 to 200°C to keep the material in a molten state, thereby promoting the smooth progress of the chlorination reaction.

[0003] As the reaction continues, the liquid level inside the reactor gradually rises, and the molten material easily splashes onto the mechanical seal of the agitator shaft at the top of the reactor. However, since the mechanical seal surface is typically in a low-temperature environment, its temperature is significantly lower than the melting point of the material (approximately 80-100°C). Therefore, when the high-temperature molten material comes into contact with the low-temperature sealing surface, cooling and crystallization easily occur. The material forms solid crystals at the sealing surface, gradually accumulating and ultimately leading to the failure of the mechanical seal.

[0004] If the seal fails, material will leak from the seal, affecting the normal operation of the equipment, increasing maintenance costs, and potentially causing environmental pollution and safety hazards. Current chlorinated paraffin production technology lacks effective methods to prevent material from cooling and crystallizing at the mechanical seal. Therefore, improvements are urgently needed to address the problem of high-temperature molten material condensing and crystallizing at the mechanical seal, in order to enhance the reliability of the reactor sealing system and the safety of the production process. Utility Model Content:

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a sealing structure for a chlorinated paraffin reactor.

[0006] A sealing structure for a chlorinated paraffin reactor includes a mounting base with a mounting hole on the bottom surface. The lower section of the inner wall of the mounting hole has a first sealing surface, and the upper section has a second sealing surface. A heating structure is provided on the mounting base, which is used to keep the first sealing surface at a temperature higher than that of the material crystallization.

[0007] Furthermore, the heating structure includes a steam channel, which is located within the mounting base at the position corresponding to the first sealing surface. The steam channel has an inlet and an outlet at both ends, which are located on the outer side of the mounting base. Hot steam enters from the inlet and exits from the outlet.

[0008] Furthermore, the mounting base is also equipped with a temperature balancing structure for cooling the temperature of the second sealing surface.

[0009] Further, the temperature balancing structure comprises a circulating flow channel arranged in the mounting seat at a position corresponding to the second sealing surface, and the circulating flow channel is provided with cooling water.

[0010] Further, the first sealing surface position is provided with a dynamic ring, and the material of the dynamic ring is sintered silicon carbide.

[0011] Further, the inner side wall of the mounting hole is provided with an annular groove, and the annular groove is provided with an O-shaped sealing ring.

[0012] Further, the material of the sealing ring is polytetrafluoroethylene.

[0013] Beneficial effects: compared with the prior art, the utility model has the following advantages:

[0014] Through multi-level comprehensive design, the overall sealing performance is significantly improved. First, the heating structure is used for precise temperature control of the first sealing surface, so that the sealing surface temperature is always higher than the material crystallization point, which effectively prevents the material from crystallizing and blocking the sealing surface, and greatly reduces the sealing failure and leakage risk. Secondly, by arranging a steam channel in the mounting seat to introduce high-temperature steam, it is ensured that the heat can be stably transmitted to the sealing surface area, further improving the heat stability and working reliability of the sealing surface. At the same time, in order to prevent the heat from spreading to the atmosphere end, a temperature balancing structure is added, which controls the temperature of the second sealing surface by circulating cooling water, avoiding the adverse effects of high temperature on the sealing material and bearing system of the atmosphere end, and enhancing the overall temperature control ability and operation stability of the system.

[0015] In terms of sealing material, the material of the dynamic ring is innovatively replaced from traditional graphite to sintered silicon carbide (SSiC), which greatly improves the end face specific pressure and the wear resistance and heat conduction efficiency of the sealing surface by using its excellent high hardness, high thermal conductivity and corrosion resistance. The service life of the sealing assembly is prolonged, and the maintenance frequency and maintenance cost are reduced. In addition, by arranging an annular groove in the mounting hole and installing an O-shaped sealing ring, a static sealing barrier is further constructed, and the multiple protection mechanism of the sealing system is strengthened; at the same time, polytetrafluoroethylene (PTFE) is selected as the material of the sealing ring, which effectively improves the high temperature resistance, corrosion resistance and creep resistance, and ensures long-term stable operation under harsh working conditions.

[0016] Overall, the present application realizes the comprehensive improvement of the sealing system performance of the chlorinated paraffin reaction kettle by optimizing the dynamic and static sealing structure, configuring the temperature control system and selecting the durable material, significantly reduces the leakage rate, improves the safety and environmental protection, prolongs the service life of the equipment, and has excellent economy, reliability and industrial application prospect. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a schematic view of a reaction kettle sealing structure;

[0018] In the figure, 1, mounting hole, 2, circulating flow channel, 3, sealing ring, 4, steam passage, 5, moving ring. DETAILED DESCRIPTION

[0019] In order to deepen the understanding of the utility model, the utility model will be further described in the following embodiments and drawings, the embodiments are only used to explain the utility model, and do not constitute the limitation of the protection scope of the utility model.

[0020] A chlorinated paraffin reaction kettle sealing structure, including mounting seat, the bottom surface of mounting seat is provided with mounting hole 1, the lower section of the inner side wall of mounting hole 1 is provided with first sealing surface, the upper section is provided with second sealing surface, the mounting seat is provided with heating structure, and the heating structure is used to keep the first sealing surface in a state higher than the crystallization temperature of material.

[0021] The present embodiment is provided with mounting hole 1 on the mounting seat, and the first sealing surface is formed on the lower section of the inner side wall of mounting hole 1, and the second sealing surface is formed on the upper section, the splashed material will stick to the first sealing surface, in order to prevent the chlorinated paraffin material from crystallizing and blocking on the sealing surface, the gap is enlarged, which leads to the failure of the whole sealing structure, and the heating structure is specially provided to heat and control the first sealing surface, so that the temperature is always kept higher than the crystallization temperature (80-100 DEG C) of the material, preferably controlled above 120 DEG C. The heating structure is conducted to the first sealing surface by heating, the surface temperature of the sealing surface is improved, the material cooling and crystallization are prevented, the sealing performance is maintained, and the leakage risk caused by crystallization is avoided.

[0022] The structure effectively inhibits the crystallization of chlorinated paraffin on the sealing surface, enhances the reliability of sealing, and significantly reduces the leakage rate. By keeping the temperature of the first sealing surface higher than the crystallization point of the material, the phenomenon of sealing failure caused by material cooling and crystallization on the sealing surface is completely eliminated, the stability of equipment operation is improved, the service life of the sealing element is prolonged, the maintenance and replacement frequency is reduced, the overall operation and maintenance cost is reduced, and the safety and environmental standard level are improved.

[0023] In a possible embodiment, the heating structure includes steam passage 4, the steam passage 4 is arranged in the mounting seat corresponding to the position of the first sealing surface, the steam passage 4 is provided with inlet and outlet at both ends respectively, the inlet and outlet are arranged on the outer side surface of the mounting seat, and hot steam enters from the inlet and is discharged from the outlet.

[0024] In this embodiment, a steam channel 4 is provided within the mounting base and arranged around the first sealing surface area, through which saturated steam at 0.3-0.5 MPa is introduced. As the hot steam flows within the steam channel 4, it transfers heat to the mounting base and the first sealing surface, achieving localized heating and maintaining the sealing surface temperature above the material's crystallization point. The inlet and outlet are respectively located on the outside of the mounting base, facilitating steam entry and exit and ensuring stable heating performance and improved temperature control accuracy.

[0025] By setting up steam channel 4 and introducing hot steam, heat energy can be provided to the first sealing surface efficiently and continuously, inhibiting the cooling and crystallization of chlorinated paraffin material, maintaining the cleanliness and sealing performance of the sealing surface, extending the service life of the sealing system, reducing the failure rate, and at the same time, utilizing the existing thermal energy system of the reactor for heat recovery to reduce energy consumption.

[0026] In one possible implementation, the mounting base is also provided with a temperature balancing structure for cooling the temperature of the second sealing surface.

[0027] This embodiment adds a temperature balancing structure to the mounting base for temperature control of the second sealing surface area. This structure ensures timely cooling of the second sealing surface after the first sealing surface is heated, preventing heat from diffusing to the atmospheric side and causing abnormal temperature rise at the atmospheric end. This protects the stability of the atmospheric sealing system and ensures reliable operation of the overall sealing system.

[0028] Through temperature balance design, the temperature rise at the atmospheric end is effectively controlled, protecting the atmospheric end seals and preventing aging and failure caused by high temperature. This improves the durability and reliability of the bearings and sealing system, and further enhances the overall operational safety of the device.

[0029] In one possible implementation, the temperature balancing structure includes a circulation channel 2, which is located within the mounting base at a position corresponding to the second sealing surface, and is provided with cooling water.

[0030] This embodiment employs a circulating flow channel 2, in which cooling water is introduced into the circulating flow channel 2 within the mounting base. The flow channel is positioned corresponding to the second sealing surface area. The cooling water flows within the flow channel, carrying away some of the heat conducted to the second sealing surface during the heating process, thereby stabilizing the temperature of the second sealing surface at approximately 40°C, preventing overheating, and forming effective temperature isolation.

[0031] By circulating cooling water, the temperature of the atmospheric sealing surface is effectively reduced, ensuring its long-term stable operation, protecting the sealing material, reducing the risk of bearing temperature rise, improving the stability and service life of the entire sealing system, and reducing material fatigue and deformation caused by thermal stress.

[0032] In one possible implementation, a moving ring 5 is provided at the first sealing surface position, and the moving ring 5 is made of sintered silicon carbide.

[0033] In this embodiment, a dynamic ring 5 is provided on the first sealing surface, and SSiC (sintered silicon carbide) material is selected. SSiC has high hardness (HV2800-3200) and high thermal conductivity (120-150W / m·K). During the sealing process, it can provide high-side surface pressure (0.4-0.6MPa), improve the tightness of the sealing surface and the heat conduction rate, effectively reduce frictional heat accumulation and improve the thermal stability of the sealing surface.

[0034] The use of sintered silicon carbide dynamic ring 5 significantly improves the wear resistance, corrosion resistance and heat conduction efficiency of the seal, prevents local overheating or wear failure of the sealing surface, increases the service life of the sealing structure, reduces maintenance costs and enhances sealing reliability. It is especially suitable for high temperature and high corrosion conditions of chlorinated paraffin.

[0035] In one possible implementation, the inner wall of the mounting hole 1 is provided with an annular groove, and an O-ring 3 is provided in the annular groove.

[0036] In this embodiment, an annular groove is provided on the inner wall of the mounting hole 1, and an O-ring 3 is installed in the groove. The O-ring 3 forms a pre-tightening force through radial compression, making tight contact with the hole wall, further enhancing the sealing effect and preventing liquid or gas from leaking along the hole wall.

[0037] By setting the O-ring 3, the dual protection effect of the sealing system is improved. In addition to the dynamic ring 5 and the stationary ring, a reliable static sealing barrier is added, which greatly improves the overall sealing performance of the sealing structure and reduces the risk of leakage.

[0038] In one possible implementation, the sealing ring 3 is made of polytetrafluoroethylene.

[0039] In this embodiment, the O-ring 3 is made of PTFE (polytetrafluoroethylene). PTFE has excellent high-temperature resistance (-200℃ to 260℃), strong chemical stability, corrosion resistance, and better creep resistance than traditional rubber materials. It can maintain good elasticity and sealing performance for a long time and can still work stably even in the high-temperature and highly corrosive environment of chlorinated paraffin reaction.

[0040] The use of PTFE sealing ring 3 significantly improves the heat resistance, corrosion resistance and service life of the sealing components, effectively avoids leakage problems caused by aging and deformation of sealing ring 3, reduces maintenance frequency and improves the reliability and safety of the overall system.

[0041] 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 sealing structure for a chlorinated paraffin reaction vessel, characterized in that, The device includes a mounting base with a mounting hole on its bottom surface. The lower section of the inner wall of the mounting hole has a first sealing surface, and the upper section has a second sealing surface. The mounting base is equipped with a heating structure, and a moving ring is provided at the position of the first sealing surface. The heating structure is used to keep the first sealing surface at a temperature higher than that of the material crystallization.

2. The sealing structure according to claim 1, characterized in that, The heating structure includes a steam channel, which is located inside the mounting base at the position corresponding to the first sealing surface. The steam channel has an inlet and an outlet at both ends, which are located on the outer side of the mounting base. Hot steam enters from the inlet and exits from the outlet.

3. The sealing structure according to claim 1 or 2, characterized in that, The mounting base is also equipped with a temperature balancing structure to cool the temperature of the second sealing surface.

4. The sealing structure according to claim 3, characterized in that, The temperature balance structure includes a circulation channel, which is located within the mounting base at the position corresponding to the second sealing surface, and cooling water is provided in the circulation channel.

5. The sealing structure according to claim 1 or 2, characterized in that, The moving ring is made of sintered silicon carbide.

6. The sealing structure according to claim 1, characterized in that, The inner wall of the mounting hole is provided with an annular groove, and an O-ring is provided in the annular groove.

7. The sealing structure according to claim 6, characterized in that, The sealing ring is made of polytetrafluoroethylene.

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