Energy-saving liquid oxygen production heat exchange system

Abstract

The utility model provides an energy-saving liquid oxygen production heat exchange system, and relates to the technical field of liquid oxygen production.The energy-saving liquid oxygen production heat exchange system comprises an air purification assembly, a supercharger, a high-pressure heat exchange assembly, an expansion machine, a low-pressure heat exchange assembly and a rectification assembly, the supercharger is connected with the air purification assembly and the high-pressure heat exchange assembly, and the rectification assembly is provided with a mixed air inlet end; the expansion machine is respectively connected with the high-pressure heat exchange assembly and the mixed air inlet end, and the low-pressure heat exchange assembly is respectively connected with the air purification assembly and the mixed air inlet end. The air purification device is simple in structure and reasonable in design, and through the arrangement of the high-pressure heat exchange assembly and the low-pressure heat exchange assembly, purified air is divided into two paths for heat exchange; wherein one path forms low-temperature liquid air through pressurization, heat exchange and the action of the expansion machine, the low-temperature liquid air is converged with the other path of liquid air and enters the rectification assembly to produce liquid oxygen, so that the load of the main heat exchange assembly is reduced, the purposes of energy conservation and efficiency improvement are achieved, and better liquid oxygen production is realized.

Description

Technical Field

[0001] The present application relates to the technical field of liquid oxygen production, and more particularly, to an energy-saving heat exchange system for liquid oxygen production. Background Art

[0002] Currently, an air separation unit (hereinafter referred to as an ASU) is commonly used to produce oxygen by the deep refrigeration method. Its main process is to pressurize, purify, liquefy, and separate air to produce oxygen. The main refrigeration equipment of the ASU is an expander, which is driven by a compressor to increase the air pressure and then perform refrigeration.

[0003] Since the existing air separation equipment uses air expansion for refrigeration, it is necessary to compress air and use a certain amount of refrigerant to maintain operation to achieve air separation. During this process, the load of the main heat exchanger increases accordingly, and the hot end temperature difference inevitably increases, resulting in a decrease in the production capacity of the liquid in the subsequent rectification system and an increase in energy consumption during the production process, making it less energy-efficient. Summary of the Invention

[0004] The purpose of the embodiments of the present application is to provide an energy-saving heat exchange system for liquid oxygen production, which can solve the technical problem of large heat exchanger load during liquid oxygen production.

[0005] The embodiments of the present application provide an energy-saving heat exchange system for liquid oxygen production, including an air purification component, a booster, a high-pressure heat exchange component, an expander, a low-pressure heat exchange component, and a rectification component. The booster is respectively connected to the air purification component and the high-pressure heat exchange component. The rectification component is provided with a mixed air inlet. The expander is respectively connected to the high-pressure heat exchange component and the mixed air inlet. The low-pressure heat exchange component is respectively connected to the air purification component and the mixed air inlet.

[0006] Further, the high-pressure heat exchange component is a high-pressure plate-fin heat exchanger.

[0007] Further, the low-pressure heat exchange component is a low-pressure plate-fin heat exchanger.

[0008] Further, the expander is connected to the mixed air inlet through a first pipeline, and a first flow regulating valve is installed on the first pipeline.

[0009] Further, the low-pressure heat exchange component is connected to the mixed air inlet through a second pipeline, and a second flow regulating valve is installed on the second pipeline.

[0010] Further, a gas mixer is installed at the mixed air inlet.

[0011] Further, the air purification component includes an adsorption tower, a filter, and a molecular sieve. The filter is disposed inside the adsorption tower for filtering impurities, and the molecular sieve is disposed inside the adsorption tower for adsorbing moisture.

[0012] Advantages of the present utility model:

[0013] The energy-saving liquid oxygen production heat exchange system provided by the present utility model includes an air purification component, a booster, a high-pressure heat exchange component, an expander, a low-pressure heat exchange component, and a rectification component. The booster is respectively connected to the air purification component and the high-pressure heat exchange component. The rectification component is provided with a mixed air inlet. The expander is respectively connected to the high-pressure heat exchange component and the mixed air inlet. The low-pressure heat exchange component is respectively connected to the air purification component and the mixed air inlet. The structure of the present utility model is simple and reasonably designed. By providing the high-pressure heat exchange component and the low-pressure heat exchange component, the purified air is heat-exchanged in two paths. One path forms low-temperature liquid air through the actions of boosting, heat exchange, and the expander, converges with the other path of liquid air, and enters the rectification component to produce liquid oxygen, so as to reduce the load of the main heat exchange component, achieve the purpose of energy conservation and efficiency improvement, and realize better liquid oxygen production. Description of the Drawings

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0015] Figure 1 is a structural schematic diagram of the present utility model;

[0016] Figure 2 is a structural schematic diagram of the air purification component of the present utility model.

[0017] The reference numerals are respectively:

[0018] Air purification component 1, adsorption tower 11, filter 12, molecular sieve 13, booster 2, high-pressure heat exchange component 3, expander 4, low-pressure heat exchange component 5, rectification component 6, first pipeline 7, first flow regulating valve 71, second pipeline 8, second flow regulating valve 81, gas mixer 9. Detailed Embodiments

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the following will clearly and completely describe the technical solutions in the embodiments of this application with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, rather than all of them. The components of the embodiments of this application usually described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of this application that is claimed, but merely represents selected embodiments of this application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts fall within the scope of protection of this application.

[0021] It should be noted that: similar reference numerals and letters indicate similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0022] In the description of this application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of this application is usually placed when in use. It is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to this application. In addition, the terms "first", "second", "third", etc. are only used for descriptive distinction and should not be construed as indicating or implying relative importance.

[0023] In addition, the terms "horizontal", "vertical", "hanging", etc. do not mean that the components are required to be absolutely horizontal or hanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0024] In the description of this application, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "installed", "connected", "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific situations.

[0025] See Figure 1 - Figure 2As shown in the figure, the energy-saving liquid oxygen production heat exchange system described in this embodiment includes an air purification component 1, a booster 2, a high-pressure heat exchange component 3, an expander 4, a low-pressure heat exchange component 5, and a rectification component 6. The booster 2 is respectively connected to the air purification component 1 and the high-pressure heat exchange component 3. The rectification component 6 is provided with a mixed air inlet end. The expander 4 is respectively connected to the high-pressure heat exchange component 3 and the mixed air inlet end. The low-pressure heat exchange component 5 is respectively connected to the air purification component 1 and the mixed air inlet end.

[0026] This embodiment has a simple structure and reasonable design. By setting the high-pressure heat exchange component 3 and the low-pressure heat exchange component 5, the purified air is heat-exchanged in two paths. One path forms low-temperature liquid air through the actions of pressurization, heat exchange, and the expander 4 and converges with the other path of liquid air, and then enters the rectification component 6 to produce liquid oxygen, so as to reduce the load of the main heat exchange component and will not cause the expansion of the hot end temperature difference of the main heat exchanger, improve the safety of the device, and achieve the purpose of energy conservation and efficiency increase, realizing better liquid oxygen production.

[0027] In some embodiments, the high-pressure heat exchange component 3 is set as a high-pressure plate-fin heat exchanger.

[0028] Specifically, the low-pressure heat exchange component 5 is set as a low-pressure plate-fin heat exchanger.

[0029] In this embodiment, by respectively setting the high-pressure heat exchange component 3 and the low-pressure heat exchange component 5 as plate-fin heat exchangers, the structure is compact, light, and has high heat transfer efficiency, which is convenient for the production of liquid oxygen.

[0030] In some embodiments, the expander 4 is connected to the mixed air inlet end through a first pipeline 7, and a first flow regulating valve 71 is installed on the first pipeline 7.

[0031] Specifically, the low-pressure heat exchange component 5 is connected to the mixed air inlet end through a second pipeline 8, and a second flow regulating valve 81 is installed on the second pipeline 8.

[0032] In this embodiment, by respectively setting flow regulating valves on the first pipeline 7 and the second pipeline 8, it is convenient to adjust the flow rate based on the heat exchange situation for better mixing and then enter the rectification component 6 for the separation and production of liquid oxygen.

[0033] In some embodiments, a gas mixer 9 is installed at the mixed air inlet end.

[0034] In this embodiment, by setting the gas mixer 9, the two paths of liquid air with different temperatures can be mixed and then enter the rectification component 6 to achieve better separation and production of liquid oxygen.

[0035] In some embodiments, the air purification component 1 includes an adsorption tower 11, a filter 12, and a molecular sieve 13. The filter 12 is disposed inside the adsorption tower 11 for filtering impurities, and the molecular sieve 13 is disposed inside the adsorption tower 11 for adsorbing moisture.

[0036] In this embodiment, the arrangement of the air purification component 1 is specifically shown. It has a simple structure and good purification effect, and can achieve the purification treatment of impurities and moisture, so as to facilitate the subsequent production.

[0037] The above are only the preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. An energy-saving liquid oxygen production heat exchange system, characterized in that: It includes an air purification component, a booster, a high-pressure heat exchange component, an expander, a low-pressure heat exchange component and a distillation component. The booster is respectively connected to the air purification component and the high-pressure heat exchange component. The distillation component is provided with a mixed air inlet end. The expander is respectively connected to the high-pressure heat exchange component and the mixed air inlet end. The low-pressure heat exchange component is respectively connected to the air purification component and the mixed air inlet end.

2. The energy-saving liquid oxygen production heat exchange system according to claim 1 is characterized in that: The high-pressure heat exchange component is configured as a high-pressure plate-fin heat exchanger.

3. The energy-saving liquid oxygen production heat exchange system according to claim 1 is characterized in that: The low-pressure heat exchange component is configured as a low-pressure plate-fin heat exchanger.

4. The energy-saving liquid oxygen production heat exchange system according to claim 1, characterized in that: The expander is connected to the mixed air intake end through a first pipeline, and a first flow regulating valve is installed on the first pipeline.

5. The energy-saving liquid oxygen production heat exchange system according to claim 1, characterized in that: The low-pressure heat exchange component is connected to the mixed air intake end through a second pipeline, and a second flow regulating valve is installed on the second pipeline.

6. The energy-saving liquid oxygen production heat exchange system according to claim 1, characterized in that: The mixed air inlet end is equipped with a gas mixer.

7. The energy-saving liquid oxygen production heat exchange system according to claim 1, characterized in that: The air purification component comprises an adsorption tower, a filter and a molecular sieve. The filter is arranged in the adsorption tower for filtering impurities, and the molecular sieve is arranged in the adsorption tower for absorbing moisture.

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