Novel skid-mounted vacuum fractionating tower cold box

Abstract

The invention relates to a novel skid-mounted vacuum fractionating tower cold box, and aims to overcome the defects in the prior art. The fractionating tower mainly comprises a cold box, a thermal insulation support and a rectifying tower, the thermal insulation support is arranged at the bottom of the cold box, the rectifying tower is fixed above the thermal insulation support, and a thermal insulation part is filled between the cold box and the rectifying tower. A heat exchanger is arranged in the cold box and connected with the rectifying tower through a pipeline I, a pipeline II and a pipeline III, the pipeline I is connected with a compressed air source, the pipeline II conveys nitrogen products prepared by the rectifying tower, and the pipeline III discharges oxygen-enriched air by-products. Carbon fiber is used as a thermal insulation bracket material, so that the fractionation efficiency is remarkably improved, and the cooling capacity loss is reduced; and the pre-filling design of pearlife is adopted, and the interior of the cold box is vacuumized, so that the heat insulation effect and the safety are enhanced. In addition, the cold box adopts a cylindrical design, so that the manufacturing cost and resource waste are reduced, the occupied area is reduced, the efficiency is improved, and the energy consumption is reduced. The skid-mounted vacuum fractionating tower cold box provided by the invention has a wide application prospect.

Description

Technical Field

[0001] The invention belongs to the technical field of chemical equipment, and in particular relates to a novel skid-mounted vacuum fractionation tower cold box. Background Art

[0002] The fractionator cold box plays a vital role in the production process of gaseous nitrogen or liquid nitrogen. It is mainly used to extract high-purity gaseous nitrogen or liquid nitrogen through separation and distillation processes. However, the traditional design and use of fractionator cold boxes have the following shortcomings:

[0003] Cold boxes are usually rectangular structures, which not only wastes materials but also takes up a large amount of floor space. In practical applications, the sealing performance of cold boxes is generally insufficient, resulting in significant cooling loss, which in turn affects the overall fractionation efficiency.

[0004] Inside the cold box, the distillation tower is usually supported directly by steel structure brackets, and this design also increases the possibility of cooling loss.

[0005] The inside of the cold box is often filled with pearl sand to improve the heat insulation effect, but pearl sand has high requirements for environmental adaptability. In the existing method, pearl sand is usually filled on site, and there is no way to vacuum it, so the temperature insulation effect is not good, which is easy to cause cold loss; this pearl sand is easy to absorb moisture during transportation and during the filling process at the customer's site, resulting in a decrease in its cold insulation performance, further exacerbating the loss of cold. On-site filling is prone to cause pollution problems.

[0006] Therefore, there are many deficiencies in the design and construction methods of traditional fractionator cold boxes, which not only increase the operating cost of the equipment, but also bring challenges to production efficiency and environmental protection. To this end, it has become an urgent issue to develop a new, efficient and environmentally friendly skid-mounted vacuum fractionator cold box design to improve its overall performance and operational flexibility.

[0007] The above information disclosed in the above background technology section is only used to enhance the understanding of the background technology of the technology described in this article. Therefore, the background technology may contain certain information that does not form the prior art known in this country to those skilled in the art. Summary of the invention

[0008] In order to solve the defects of the above-mentioned prior art, the present invention proposes a novel skid-mounted vacuum distillation tower cold box.

[0009] The technical solution adopted by the present invention is as follows:

[0010] A novel skid-mounted vacuum fractionation tower cold box, comprising: a cold box, a temperature-insulating bracket is arranged at the bottom of the cold box, a distillation tower is fixedly installed above the temperature-insulating bracket, a space between the distillation tower and the cold box is filled with a heat-insulating component, a heat exchanger is also arranged inside the cold box, and the heat exchanger and the distillation tower are connected through pipelines I, II and III;

[0011] The space between the distillation tower and the cold box is filled with a heat-insulating component, which is pearl sand. The pearl sand is pre-filled in the cold box in advance. After the cold box is filled with pearl sand, the skid-mounted distillation tower cold box is evacuated before leaving the factory, and the vacuum degree reaches less than 10 Pa. Furthermore, the entire process of filling the insulation material and evacuating the vacuum is completed in the factory.

[0012] In the preferred technical solution, pipeline I is externally connected to a compressed gas source, and pipeline I contains compressed air, which is input into the distillation tower.

[0013] In the preferred technical solution, the pipeline II contains nitrogen or liquid nitrogen products prepared by the distillation tower, which are sent to the user terminal for use.

[0014] In the preferred technical solution, the pipeline III contains oxygen-enriched air, a by-product produced by the distillation tower, a part of which is used as the expansion gas of the expander, and the other part is used as the regeneration and cold blowing gas of the purification system.

[0015] In the preferred technical solution, the thermal insulation bracket is a carbon fiber plate structure.

[0016] Furthermore, the thickness of the carbon fiber plate structure is 40 mm.

[0017] In the preferred technical solution, the cold box is cylindrical in shape.

[0018] In the preferred technical solution, the cold box is externally connected to a pressure relief pipeline, and a pressure relief valve is provided on the pressure relief pipeline.

[0019] In the preferred technical solution, the skid-mounted vacuum distillation tower cold box is externally connected to a vacuum pipeline, on which a vacuum valve is provided. The vacuum pipeline evacuates the skid-mounted distillation tower cold box through a vacuum pump to eliminate the loss of cooling capacity of the distillation tower and achieve the purpose of reducing energy and emissions.

[0020] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0021] 1) Replacing the traditional steel structure support with a carbon fiber insulation support can significantly improve the distillation efficiency of the vacuum distillation tower, reduce the loss of cooling capacity, and thus achieve higher economic benefits.

[0022] 2) The design of pre-filling pearl sand in the cold box at the manufacturing plant not only improves the insulation effect and reduces the loss of cold air, but also enhances the working stability and safety of the cold box, optimizes the installation process, and provides a strong guarantee for the efficient operation of the skid-mounted distillation tower cold box.

[0023] 3) In the traditional method, only pearl sand is loaded in the cold box. In this scheme, after the pearl sand is loaded, the skid-mounted distillation tower cold box is evacuated by a vacuum pump through a vacuum valve, so that the vacuum degree of the skid-mounted distillation tower cold box is less than 10Pa. The vacuum degree of the skid-mounted vacuum distillation tower cold box is less than 10Pa, which further eliminates the loss of cooling capacity and achieves the effect of reducing energy and emissions.

[0024] 4) The shape of the cold box is cylindrical. This cylindrical design is more efficient in material usage compared to the traditional rectangular structure. It reduces manufacturing costs and resource waste. Secondly, the cylindrical cold box occupies less ground space, making its layout more flexible in a small environment. The cylindrical outer shape helps to reduce cold loss. Due to its uniform curved surface design, the temperature distribution inside the cold box is more uniform, reducing the loss caused by the concentration of cold in a certain corner. Compared with a rectangular cold box, a cylindrical cold box can more effectively maintain the internal temperature under the same conditions, improve refrigeration efficiency, and reduce energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will now be described by way of example with reference to the accompanying drawings, in which:

[0026] Figure 1 Schematic diagram of the structure of a novel vacuum distillation tower in one embodiment of the present invention. DETAILED DESCRIPTION

[0027] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application usually described and shown in the drawings here can be arranged and designed in various configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0028] This embodiment provides a new type of skid-mounted vacuum fractionation tower cold box, see Figure 1 ,include:.

[0029] Cold box 1: As the core component of the entire distillation system, cold box 1 not only provides a closed environment, but also ensures temperature stability through insulation measures.

[0030] Insulation bracket 2: The bottom of the cold box 1 is provided with an insulation bracket 2. Optionally, the insulation bracket 2 is a 40mm carbon fiber plate-shaped structural member with excellent thermal insulation performance. The advantage of this design is that it can effectively reduce heat conduction and energy loss, thereby improving the fractionation efficiency in the tower, reducing energy loss, and thus improving the fractionation efficiency in the tower.

[0031] Distillation tower 3: Fixedly installed above the insulation support 2, the distillation tower 3 is the main equipment for gas separation and purification. It is equipped with multiple packings or trays to increase the contact area between gas and liquid, thereby promoting the fractionation effect.

[0032] Insulation components: The space between the distillation tower 3 and the cold box 1 is filled with insulation components to further enhance the overall thermal isolation performance, ensure a constant temperature inside the cold box 1, and improve the stability of the distillation process.

[0033] Heat exchanger 5: A heat exchanger 5 is also provided inside the cold box 1, which is responsible for heat exchange between the cooling medium and the material in the distillation tower 3 to improve the thermal efficiency of the system. The heat exchanger 5 is connected to the distillation tower 3 through three pipelines, which are responsible for transporting different fluids.

[0034] A cold box 1 is provided with an insulating support 2 at the bottom, a distillation tower 3 is fixedly installed above the insulating support 2, the space between the distillation tower 3 and the cold box 1 is filled with insulating components, a heat exchanger 5 is also provided inside the cold box 1, and the heat exchanger 5 is connected to the distillation tower 3 through pipelines I6, II7 and III8.

[0035] Pipeline design

[0036] Pipeline Ⅰ6: This pipeline is connected to a compressed gas source. Compressed air is filled into pipeline Ⅰ6, and the compressed air is input into the distillation tower 3 through the pipeline. The purpose of this design is to increase the pressure in the tower, promote the evaporation and separation of substances, and thus improve the fractionation efficiency.

[0037] Pipeline II7: This pipeline is used to transport the nitrogen product prepared by the distillation tower 3 directly to the user terminal for use. As an important industrial gas, nitrogen is widely used in the fields of chemical industry, food packaging, electronics, etc.

[0038] Pipeline III8: This pipeline is used to discharge the byproduct of distillation tower 3 - oxygen-enriched air. Part of the oxygen-enriched air is used as the expansion gas of the expander, and the other part is used as the regeneration and cold blowing gas of the purification system. This design not only simplifies the operation process of the system, but also avoids the cost of secondary utilization of oxygen-enriched air, thereby improving the overall economy.

[0039] In the actual operation process, first, compressed air is input into the distillation tower 3 through pipeline Ⅰ6. In the distillation tower 3, the gas and liquid are fully contacted to complete the fractionation process, and the nitrogen is collected and transported to the user terminal through pipeline Ⅱ7. The by-product oxygen-enriched air is directly discharged through pipeline Ⅲ8, reducing the environmental impact of the production process.

[0040] One of the innovations of this embodiment is that the traditional steel structure bracket is replaced with a carbon fiber insulation bracket 2. Carbon fiber material has the following significant advantages:

[0041] Excellent thermal insulation performance: The thermal conductivity of carbon fiber is much lower than that of ordinary steel, which can effectively reduce the conduction of heat. The skid-mounted vacuum cold box is evacuated to keep the cooling loss of the distillation tower inside the cold box 1 basically zero, so as to achieve constant low temperature operation and improve the distillation separation efficiency.

[0042] Lightweight design: Carbon fiber has a low density, which can effectively reduce the overall weight of the equipment, reduce the requirements for infrastructure, and facilitate the installation and maintenance of the equipment.

[0043] Corrosion resistance: Carbon fiber materials perform well in chemical corrosion and are suitable for long-term use in harsh industrial environments, extending the service life of the equipment.

[0044] Through the implementation of the above technical solution, the fractionation efficiency of the vacuum fractionation tower can be significantly improved, energy consumption can be reduced, and higher economic benefits can be achieved. At the same time, due to the use of carbon fiber brackets, the loss of cold during the fractionation process is reduced, further improving the nitrogen production efficiency of the device.

[0045] In summary, the new vacuum fractionation tower of this embodiment can effectively improve the fractionation efficiency and reduce energy consumption through innovative design and material application, and has good market application prospects. With the continuous advancement of technology and the expansion of application fields, the equipment is expected to play an important role in multiple industries and contribute to the green transformation and sustainable development of industry. At the same time, it is expected that relevant researchers and enterprises can conduct more in-depth exploration and cooperation on this basis to jointly promote innovation and development in this field.

[0046] Furthermore, the cold box 1 is externally connected to a pressure relief pipeline 9, on which a pressure relief valve 10 is provided. When the pressure inside the cold box 1 increases due to temperature changes or other factors, the pressure relief valve 10 will open quickly to allow the excess gas to be safely released, thereby preventing damage or safety hazards caused by overpressure in the cold box 1. This design can effectively protect the cold box 1 and its internal materials, ensure its safe operation under high pressure conditions, and reduce the risk of accidents.

[0047] At the same time, the cold box 1 is also connected to an external vacuum line 11, and a vacuum valve 12 is provided on the vacuum line 11. In the factory pre-installation, the vacuum line 13 evacuates the fractionation tower cold box to eliminate the loss of cold capacity of the fractionation tower and achieve the purpose of reducing energy and emissions. The main function of the vacuum valve 12 is to extract the air inside the cold box 1 to achieve a vacuum state, thereby significantly reducing the heat conduction and convection inside the cold box 1 and further improving the cold preservation effect. By achieving a vacuum state, the loss of cold capacity in the cold box 1 is effectively eliminated, the stability of the internal temperature is maintained, and the quality and safety of the refrigerated items are ensured.

[0048] Combining the designs of these two valves, the cold box 1 can not only maintain an ideal internal environment during operation, but also respond quickly to abnormal situations. When the internal pressure is too high, the pressure relief valve 10 can be activated in time to prevent the cold box 1 from malfunctioning due to pressure loss; and in normal operation, the vacuum system can continuously maintain the low pressure state inside the cold box 1, thereby minimizing the loss of cooling capacity.

[0049] This comprehensive safety design improves the efficiency and safety of the cold box 1, and provides users with a more reliable refrigeration solution. By having both pressure relief and vacuum functions, the cold box 1 can maintain its excellent thermal insulation and refrigeration effects under a variety of operating conditions, adapt to more stringent industrial and commercial application requirements, and ensure the stability and safety of the production process.

[0050] In an optional embodiment, the cold box 1 is cylindrical in shape. This cylindrical design has many advantages over the traditional rectangular parallelepiped structure.

[0051] First, the cylindrical structure is more efficient in terms of material usage. Since the surface area of ​​the cylinder is relatively small, the amount of material required for the same volume is significantly reduced, thereby reducing manufacturing costs and resource waste. This design concept is in line with the trend of modern environmental protection and sustainable development.

[0052] Secondly, the cylindrical cold box 1 occupies less ground space, making its layout more flexible in a small environment. For example, in an urban residence or limited commercial space, the cylindrical cold box 1 can better integrate into the surrounding environment, saving valuable ground area and leaving more space for the layout of other facilities.

[0053] In addition, the cylindrical outer shape helps to reduce the loss of cooling capacity. Due to its uniform curved surface design, the temperature distribution inside the cold box 1 is more uniform, reducing the loss caused by the concentration of cooling capacity in a certain corner. Compared with the rectangular cold box 1, the cylindrical cold box 1 can more effectively maintain the internal temperature under the same conditions, improve the refrigeration efficiency and reduce energy consumption.

[0054] Finally, the cylindrical appearance design also provides more possibilities for the aesthetics of the product. In the market competition, the cylindrical cold box 1 with a unique appearance can attract more consumers' attention and enhance the brand image.

[0055] In summary, the cold box 1 with a cylindrical design not only has obvious advantages in terms of material utilization, space occupancy and energy efficiency, but also adds value to the product in terms of aesthetics, providing a more superior refrigeration solution.

[0056] In an optional embodiment, the space between the distillation tower 3 and the cold box 1 is filled with an insulating component, pearl sand 4. In this embodiment, the pearl sand 4 is pre-filled in the cold box 1 in advance in the manufacturing plant. After the pearl sand insulation material is filled and the cold box of the distillation tower is evacuated before leaving the factory, the vacuum degree reaches less than 10 Pa. Compared with the existing on-site filling method, this design ensures that the cooling loss of the distillation tower is close to 0, thereby achieving the purpose of energy saving and consumption reduction, and has significant advantages.

[0057] First, filling the cold box 1 with pearl sand 4 in advance can effectively avoid the problem of pearl sand 4 absorbing moisture during transportation and installation. Pearl sand 4 is an excellent thermal insulation material, but its performance will decrease due to moisture absorption, resulting in a weakened cold insulation effect, thereby increasing cold loss. By pre-filling, the pearl sand 4 can be kept dry during the manufacturing stage, thereby maintaining its optimal thermal insulation performance and improving the energy efficiency of the cold box 1.

[0058] Secondly, reducing the on-site filling process can also reduce the impact of the external environment on the working state of the cold box 1. When filling on site, factors such as the temperature and humidity of the surrounding environment may have an adverse effect on the filling effect, thereby affecting the overall performance of the cold box 1. The pre-filling method can ensure that the filling is carried out in a controlled environment, reduce the risk of contamination, and ensure the safety and stability of production. This method can effectively prevent the performance of the insulation material from deteriorating due to external factors, thereby improving the reliability of the cold box 1.

[0059] In addition, pre-filled pearl sand 4 can also shorten the time of on-site installation and improve work efficiency. The traditional on-site filling process is not only time-consuming, but also requires additional human resources. The pre-filled design can be completed in the factory, and only simple connection and debugging are required on site, which greatly improves the installation efficiency and reduces the potential risks during the construction process.

[0060] Finally, the method of pre-filling pearl sand 4 also helps to optimize the overall design of the cold box 1. Since the filling of the insulation material can be completed during the manufacturing stage, the designer can better consider the space utilization and structural strength of the cold box 1, thereby improving the overall performance of the product.

[0061] In summary, the design of pre-filling the pearl sand 4 in the cold box 1 not only improves the insulation effect and reduces the cold loss, but also enhances the working stability and safety of the cold box 1, optimizes the installation process, and provides a strong guarantee for the efficient operation of the cold box 1.

[0062] It should be noted that the controller and its automatic control program involved in the present invention can be implemented in the scenario of the present invention by those skilled in the art according to the principles of similar control programs in the prior art, and are not the inventiveness of the present invention. In addition, the electronic components and corresponding electronic circuits involved in this application are all prior art, and those skilled in the art can fully implement them. Needless to say, the content protected by the present invention does not involve improvements to software, algorithms and methods.

[0063] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A new type of skid mounted vacuum fractionator cold box, characterized in that: include: A cold box, wherein a thermal insulation bracket is provided at the bottom of the cold box, a distillation tower is fixedly installed above the thermal insulation bracket, the space between the distillation tower and the cold box is filled with thermal insulation components, a heat exchanger is also provided inside the cold box, and the heat exchanger and the distillation tower are connected through pipelines I, II and III; The space between the distillation tower and the cold box is filled with an insulating component, which is pearl sand. The pearl sand is pre-filled in the cold box in advance. After the cold box is filled with the pearl sand, the cold box of the distillation tower is evacuated before leaving the factory, and the vacuum degree reaches less than 10Pa.

2. A novel skid-mounted vacuum fractionation tower cold box according to claim 1, characterized in that: The pipeline I is externally connected to a compressed gas source, and the pipeline I contains compressed air, which is input into the distillation tower.

3. A novel skid-mounted vacuum fractionation tower cold box according to claim 1, characterized in that: The pipeline II contains the nitrogen product prepared by the distillation tower, which is sent to the user terminal for use.

4. A novel skid-mounted vacuum fractionation tower cold box according to claim 1, characterized in that: The pipeline III contains oxygen-enriched air, a by-product produced by the distillation tower, a part of which is used as expansion gas of the expander, and the other part is used as regeneration and cold blowing gas of the purification system.

5. A novel skid-mounted vacuum fractionation tower cold box according to claim 1, characterized in that: The thermal insulation bracket is a carbon fiber plate structural member.

6. A novel skid-mounted vacuum fractionation tower cold box according to claim 5, characterized in that: The thickness of the carbon fiber plate structure is 40 mm.

7. A novel skid-mounted vacuum fractionation tower cold box according to claim 1, characterized in that: The cold box is cylindrical in shape.

8. The novel skid-mounted vacuum fractionation tower cold box according to claim 1 is characterized in that: The cold box is externally connected to a pressure relief pipeline, and a pressure relief valve is arranged on the pressure relief pipeline.

9. A novel skid-mounted vacuum fractionation tower cold box according to claim 1, characterized in that: The cold box is externally connected to a vacuum pipeline, and a vacuum valve is arranged on the vacuum pipeline.

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