High melting point and sublimation material conveying anti-freezing discharge device
The anti-solidification discharge device with a three-layer sleeve structure solves the blockage problem in the conveying of high-melting-point materials, realizes stable material conveying and safe cleaning, and reduces production costs.
Patent Information
- Application Number
- CN202522047336.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-23
- Publication Date
- 2026-08-25
- Estimated Expiration
- 2035-09-23
AI Technical Summary
In chemical production, during the transportation of high-melting-point or easily sublimated materials, submerged pipelines are prone to solidification and blockage, resulting in tedious, dangerous, and production-impacting cleaning. Existing cleaning methods are time-consuming and unsafe.
Design a three-layer sleeve structure anti-solidification discharge device, including a material channel, a covered high-temperature and low-temperature heat source channel to form a continuous circulating heating circuit, using 316L stainless steel or Hastelloy material, combined with flange connection and fasteners to ensure the stability and sealing of the device.
It achieves full-process heating of materials, avoids solidification and blockage, simplifies the cleaning process, reduces production costs, and improves the reliability and safety of the equipment.
Smart Images
Figure CN224672652U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of chemical equipment technology, and in particular to an anti-solidification discharge device for conveying high-melting-point, easily solidified and easily sublimated materials. Background Technology
[0002] In chemical production, it is often necessary to transfer materials with high melting points or those that are easily sublimated. Common high-melting-point materials, such as p-nitrochlorobenzene and 4,4-dinitrodiphenyl ether, are transported from metering tanks or intermediate reactors to the reaction vessels of the next process. These materials are solid at room temperature and only maintain a molten fluid state above a certain temperature.
[0003] When transferring such materials from metering tanks or intermediate reactors to other processes, a pressing method is often used, where a submersible pipe is installed inside the tank or reactor, and nitrogen is introduced into the reactor. The advantage of this method is that after pressing, the material in the pipe can be forced back into the metering tank or intermediate reactor by introducing nitrogen into the pipe, leaving virtually no material in the pipe and preventing blockage. However, in actual production, the submersible pipe between the discharge valve of the metering tank or intermediate reactor and the uninsulated section inside the metering tank or intermediate reactor often becomes blocked by crystallization and solidification. Since this submersible pipe is usually fixed to the inner wall of the reactor, cleaning such blocked pipes requires first cleaning and replacing the material in the metering tank or intermediate reactor, then having workers enter the equipment to remove the submersible pipe and move it outside the metering tank or intermediate reactor for cleaning. This cleaning method is not only cumbersome and time-consuming, affecting normal production, but also poses a significant danger to workers entering and exiting chemical storage and reaction equipment. Therefore, there is an urgent need to improve the method of cleaning the discharge pipe or to improve the discharge device.
[0004] Based on practical production experience, the main cause of pipe blockage is as follows: The outer jacket of most reactor-type equipment is located approximately 100mm from the weld seam of the lower head. The upper head of the metering tank or intermediate reactor lacks jacket heating. Although there are general insulation measures on the outside of the upper head, their effectiveness is far less than that of jacket insulation, resulting in a temperature difference between the space in the upper head and the heated jacketed portion of the metering tank or intermediate reactor. When the temperature at the top of the head is lower than the melting point of the material, some of the material will solidify during pipeline transport. As the operating time increases, the material gradually solidifies, the pipe cavity becomes smaller and smaller, eventually causing blockage and preventing the material from passing through. Summary of the Invention
[0005] The purpose of this invention is to address the problems existing in the above-mentioned background technology by providing a high-melting-point and sublimated material conveying anti-solidification discharge device that has an integrated structure, high heating efficiency, and can effectively prevent solidification and blockage of materials throughout the entire conveying process.
[0006] To achieve the above objectives, the present invention adopts the following technical solution: An anti-solidification discharge device for conveying high-melting-point and sublimated materials is installed inside a metering tank or intermediate vessel for conveying high-melting-point and sublimated materials to other processes. Its material outlet is located outside the metering tank or intermediate vessel. The device includes: an innermost material channel with a material outlet at its upper end and a material inlet at its lower end; a high-temperature heat source channel covering the material channel with a high-temperature heat source inlet at its top; and a low-temperature heat source channel covering the high-temperature heat source channel with a low-temperature heat source outlet at its top. The high-temperature heat source channel and the low-temperature heat source channel are interconnected at their lower ends to form a continuous circulating heating loop.
[0007] As a preferred technical solution of this utility model, it solves the technical problem that straight-tube discharge pipes cannot reach the bottom edge of the vessel, resulting in a large amount of material residue at the bottom of the vessel, low yield, and difficulty in cleaning the vessel. The material inlet at the lower end of the material channel is a curved pipe whose shape conforms to the bottom shape of the metering tank or intermediate vessel.
[0008] To address the challenges of manufacturing complex double-layer heating jackets for a single, intricate section of a curved pipe, which are extremely difficult, costly, and prone to quality issues, this invention significantly simplifies the manufacturing process, reduces production costs, and improves the structural strength and reliability of the device's base. Furthermore, since the curved section is located below the high-temperature liquid surface, the liquid inside is less prone to solidification. Therefore, as a further preferred embodiment of this invention, the curved section is not covered by the high-temperature heat source channel and the low-temperature heat source channel.
[0009] To achieve separation of the pipe interface from the top seal, the sealing reliability and structural strength of the top of the device are improved. The side-in, side-out method ensures that the heat source medium completely fills the top space of the entire circulation loop, effectively venting air cavities and ensuring the stability of the heating medium circulation, thereby ensuring a stable heat transfer effect. As another preferred technical solution of this utility model, the upper ends of both the high-temperature heat source channel and the low-temperature heat source channel are sealed; the high-temperature heat source inlet is connected to the side wall of the upper end of the high-temperature heat source channel, and the low-temperature heat source outlet is connected to the side wall of the upper end of the low-temperature heat source channel.
[0010] To address the problem of rapid corrosion, short lifespan, and even product contamination of ordinary carbon steel or stainless steel equipment caused by the corrosive nature of the materials themselves or their associated impurities when conveying high-melting-point materials (such as p-nitrochlorobenzene), while also considering thermal conductivity, this invention proposes a preferred embodiment where the high-temperature heat source channel, the low-temperature heat source channel, and the material channel are all made of 316L stainless steel or Hastelloy.
[0011] To provide a standardized installation interface, enabling convenient and quick installation of the device onto the pre-reserved port on the vessel body while ensuring a tight seal, and more importantly, achieving a detachable connection, greatly facilitating future equipment maintenance and replacement, and reducing the total life-cycle cost. As another preferred embodiment of this invention, a flange connector located on the upper part of the device is also included for detachably connecting the device to the pre-reserved port on the metering tank or intermediate vessel.
[0012] To address the technical problem that the device's slender structure may cause shaking and vibration when subjected to material flow impacts or agitator vortices within the vessel, leading to fatigue damage or structural instability at the root connection, another preferred technical solution of this invention includes at least one fixing component for securing the device to the inner wall of the metering tank or intermediate vessel.
[0013] To address the engineering problem of providing a stable, controllable, and high-temperature heat source above 100°C to this device, as another preferred technical solution of this utility model, the heat source medium in the high-temperature heat source channel and the low-temperature heat source channel is either heat transfer oil or low-pressure steam.
[0014] The beneficial effects of this utility model are as follows: 1. Highly efficient heat tracing, preventing solidification: This device adopts a three-layer sleeve integrated design, with a high-temperature heat source directly tracing the material channel throughout the entire process without dead angles. The heat transfer efficiency is high, fundamentally solving the problem of material solidification and blockage due to cooling during the suction and transportation process.
[0015] 2. Integrated structure and high reliability: The material conveying and circulating heating functions are highly integrated into one component, which is compact, easier to install, has fewer potential leakage points, and is more reliable in operation.
[0016] 3. High adaptability and thorough emptying: The bent tube design at the bottom can reach deep into the vessel bottom, effectively sucking up materials and reducing residue. The bent tube section does not have a heating layer, which simplifies the manufacturing process.
[0017] 4. Flexible material selection and wide application: By selecting corrosion-resistant materials such as 316L stainless steel or Hastelloy, this device is also suitable for conveying corrosive high-melting-point materials, making it widely applicable.
[0018] 5. Easy to install and maintain: The design of flange connectors and fasteners enables standardized installation and fixation of the device, ensuring both the sealing and stability of the connection, and facilitating subsequent maintenance or replacement. Attached Figure Description
[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments 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.
[0020] Figure 1 This is a schematic diagram of the structure of the discharge device installed in the intermediate reactor in a specific embodiment of the present invention.
[0021] Figure 2 This is a schematic diagram of the flow direction of each medium in the discharge device.
[0022] Explanation of reference numerals in the attached figures: 1. Material outlet, 2. Material channel, 3. High-temperature heat source channel, 4. High-temperature heat source inlet, 5. Low-temperature heat source outlet, 6. Low-temperature heat source channel, 7. Fixture, 8. Material inlet, 9. Nitrogen inlet, 10. Flange connection. Detailed Implementation
[0023] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.
[0024] Please see Figure 1 and Figure 2 This utility model provides a preferred embodiment of an anti-solidification discharge device for conveying high-melting-point and sublimable materials. The device has an overall slender tubular structure and is installed inside a metering tank or intermediate vessel.
[0025] like Figure 1 As shown, the device includes a material channel 2 located at the very center. A high-temperature heat source channel 3 is coaxially wrapped around the material channel 2. A low-temperature heat source channel 6 is then coaxially wrapped around the high-temperature heat source channel 3. These three channels together form a three-layer casing structure. Figure 2 As shown, the three-layer sleeve structure can be clearly seen.
[0026] At the lower end of the discharge device, the high-temperature heat source channel 3 and the low-temperature heat source channel 6 are interconnected, thus forming a continuous and closed circulating heating loop between the two channels.
[0027] At the upper end of the discharge device, the top of the high-temperature heat source channel 3 is sealed by welding to the pipe wall of the material channel 2, and the top of the low-temperature heat source channel 6 is sealed by welding to the pipe wall of the high-temperature heat source channel. A high-temperature heat source inlet 4 is provided on the upper side wall of the high-temperature heat source channel 3, and a low-temperature heat source outlet 5 is provided on the upper side wall of the low-temperature heat source channel 6.
[0028] During operation, a high-temperature heat source medium, such as 300°C heat transfer oil or low-pressure steam, enters from the high-temperature heat source inlet 4, flows downwards along the high-temperature heat source channel 3 to the bottom of the device, then enters the low-temperature heat source channel 6 and flows upwards, finally exiting from the low-temperature heat source outlet 5. In this way, the high-temperature medium flows throughout the entire circulation loop, and its heat is efficiently transferred through the pipe wall of the high-temperature heat source channel 3 to the innermost material channel 2, thus ensuring that the material in the material channel 2 remains above the set melting temperature and does not solidify. Then, following the normal material handling procedure, the material outlet 1 and the nitrogen valve 9 on the reactor are opened sequentially, using nitrogen pressure to force the material through the bottom material inlet into the material inlet 8, and then through the material outlet 1 to the next process. The entire pressing process ensures smooth transport of the material through the channels. After pressing is completed, the material outlet 1, the high-temperature heat source inlet 4, and the low-temperature heat source outlet 5 are closed sequentially. The material and heat source transport flow path is as follows: Figure 2 As shown.
[0029] In this embodiment, to more thoroughly extract the material from the bottom of the vessel, the lower material inlet of the material channel 2 is designed as a bent pipe 8, the curved shape of which can conform to the arc-shaped bottom of the metering tank or intermediate vessel. Preferably, the bent pipe 8 is not covered by the high-temperature heat source channel 3 and the low-temperature heat source channel 6, which simplifies the processing difficulty.
[0030] To ensure stable and detachable installation of the device on the vessel, a flange connector 1 is provided on the upper part of the device. This flange can be fastened to the flange opening reserved on the top of the vessel by bolts. At the same time, to prevent the slender device from shaking due to material agitation inside the vessel, at least one fixing member 9 can be provided in the middle and lower part of the device. One end of the fixing member is connected to the outer wall of the low-temperature heat source channel 6, and the other end can be connected to the inner wall of the vessel or the internal support component.
[0031] Considering the corrosive nature of chemical materials, all main channels of this device, including material channel 2, high-temperature heat source channel 3, and low-temperature heat source channel 6, can be made of materials with excellent corrosion resistance. For example, 316L stainless steel can be used to cope with conventional corrosive environments, or Hastelloy can be used to cope with extremely harsh corrosive environments such as hydrochloric acid and wet chlorine. Hastelloy includes nickel-based high-temperature corrosion-resistant alloys, such as nickel-molybdenum-chromium (Ni-Mo-Cr) C-276, C-22, C-2000, C-4, etc. Due to the large number of material series, they will not be listed here.
[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.
Claims
1. A high-melting-point and sublimation material conveying anti-solidification discharge device, installed inside a metering tank or intermediate vessel, for conveying high-melting-point and sublimation materials to other processes, wherein the material outlet end is located outside the metering tank or intermediate vessel, characterized in that... include: The innermost material channel (2) has a material outlet at its upper end and a material inlet at its lower end; A high-temperature heat source channel (3) is wrapped around the material channel, and a high-temperature heat source inlet is provided at its top. A low-temperature heat source channel (6) is wrapped around the outside of the high-temperature heat source channel, and a low-temperature heat source outlet is provided at its top. The high-temperature heat source channel and the low-temperature heat source channel are interconnected at the lower end to form a continuous circulating heating loop.
2. The anti-solidification discharge device for conveying high-melting-point and sublimation materials according to claim 1, characterized in that, The material inlet at the lower end of the material channel (2) is a curved pipe whose shape conforms to the bottom shape of the metering tank or intermediate vessel.
3. The anti-solidification discharge device for conveying high-melting-point and sublimation materials according to claim 2, characterized in that, The bent section is not covered by the high-temperature heat source channel and the low-temperature heat source channel.
4. The anti-solidification discharge device for conveying high-melting-point and sublimation materials according to claim 1, characterized in that, The upper ends of the high-temperature heat source channel (3) and the low-temperature heat source channel (6) are both sealed; the high-temperature heat source inlet (4) is connected to the side wall of the upper end of the high-temperature heat source channel (3), and the low-temperature heat source outlet (5) is connected to the side wall of the upper end of the low-temperature heat source channel (6).
5. The anti-solidification discharge device for conveying high-melting-point and sublimation materials according to any one of claims 1-4, characterized in that, The high-temperature heat source channel (3), the low-temperature heat source channel (6), and the material channel are all made of 316L stainless steel or Hastelloy.
6. The anti-solidification discharge device for conveying high-melting-point and sublimation materials according to claim 1, characterized in that, It also includes a flange connector located on the upper part of the device for detachably connecting the device to the equipment reserved port of the metering tank or intermediate vessel.
7. The anti-solidification discharge device for conveying high-melting-point and sublimation materials according to claim 1, characterized in that, It also includes at least one fastener for fixing the device to the inner wall of the metering tank or intermediate vessel.
8. The anti-solidification discharge device for conveying high-melting-point and sublimation materials according to claim 1, characterized in that, The heat source medium in the high-temperature heat source channel (3) and the low-temperature heat source channel (6) is either heat transfer oil or low-pressure steam.