Freezing water pipeline structure in cryogenic oxygen production pre-cooling system

Abstract

The utility model relates to a chilled water pipeline structure in a cryogenic oxygen production pre-cooling system, which comprises a first refrigerating unit, a second refrigerating unit, a third refrigerating unit, a fourth refrigerating unit and a fourth refrigerating unit, the water inlet end of the first refrigerating unit is connected with a first water inlet branch pipe, and the water outlet end is connected with a first water outlet branch pipe; the water inlet end of the second refrigerating unit is connected with a second water inlet branch pipe, and the water outlet end is connected with a second water outlet branch pipe; wherein the first water outlet branch pipe and the second water outlet branch pipe are connected with the air cooling tower through the water outlet main pipe, the first water inlet branch pipe, the first water outlet branch pipe and the water outlet main pipe form a main pipeline, and the second water inlet branch pipe, the second water outlet branch pipe and the water outlet main pipe form a bypass pipeline. When the outlet pipeline of the first refrigerating unit on the main pipeline or the heat exchanger is blocked, part of chilled water can be directly fed into the air cooling tower through the bypass pipeline to ensure that the chilled water flow of the air cooling tower meets the production process requirements, so that the air temperature of the outlet of the air cooling tower is prevented from rising, and the production efficiency is improved. And thus, the adsorption performance of the purification molecular sieve in the cryogenic oxygen production pre-cooling system is prevented from being reduced.

Description

Technical Field

[0001] The present application relates to the technical field of cryogenic oxygen pre-cooling systems, and in particular to a chilled water pipeline structure in a cryogenic oxygen pre-cooling system. Background Art

[0002] The cryogenic oxygen precooling system is a key component of cryogenic air separation oxygen production technology. Its primary function is to cool the compressed air entering the cryogenic air separation unit, lowering its temperature and removing some moisture and impurities. This helps the subsequent gas separation process run more efficiently and stably, while also extending the equipment's lifespan and reducing energy consumption.

[0003] The refrigeration unit and the air cooling tower are components of the cryogenic oxygen pre-cooling system. The two are connected through pipelines, and the refrigeration unit provides chilled water to the air cooling tower through pipelines.

[0004] The traditional chilled water piping structure consists of a refrigeration unit directly connected to an air-cooling tower through a pipeline. When the outlet pipeline or heat exchanger of the refrigeration unit is blocked, the chilled water entering the air-cooling tower will continue to decrease, causing the outlet air temperature of the air-cooling tower to increase, thereby causing the adsorption performance of the purified molecular sieve in the cryogenic oxygen pre-cooling system to decrease. Utility Model Content

[0005] In order to solve or partially solve the problems existing in the related art, the present application provides a chilled water pipeline structure in a cryogenic oxygen pre-cooling system.

[0006] To achieve the above objectives, this application is implemented through the following technical solutions:

[0007] A chilled water piping structure in a cryogenic oxygen pre-cooling system, the chilled water piping structure in the cryogenic oxygen pre-cooling system comprising:

[0008] a first refrigeration unit, wherein the water inlet end thereof is connected to the first water inlet manifold, and the water outlet end thereof is connected to the first water outlet manifold;

[0009] The second refrigeration unit has a water inlet end connected to the second water inlet manifold and a water outlet end connected to the second water outlet manifold;

[0010] Among them, the first water outlet branch and the second water outlet branch are connected to the air cooling tower through the water outlet main pipe, the first water inlet branch, the first water outlet branch and the water outlet main pipe constitute the main line, and the second water inlet branch, the second water outlet branch and the water outlet main pipe constitute the bypass line.

[0011] Optionally, the first water inlet branch and the second water inlet branch are connected to a water pump through a water inlet main pipe, and the water pump is connected to a water source.

[0012] Optionally, a first water inlet valve is provided on the first water inlet branch, and a first water outlet valve is provided on the first water outlet branch.

[0013] Optionally, a second water inlet valve is provided on the second water inlet branch, and a second water outlet valve is provided on the second water outlet branch.

[0014] Optionally, a main water inlet valve is provided on the main water inlet pipe.

[0015] Optionally, a third water inlet pipe is connected in parallel to the water inlet main pipe, and the third water inlet pipe is connected to a booster turbine expander unit.

[0016] Optionally, a third water inlet valve is provided on the third water inlet pipe.

[0017] The beneficial effects of this application are as follows: This application provides a main line and a bypass line, and realizes auxiliary water supply to the air-cooling tower through the bypass line. If the outlet pipe or heat exchanger of the first refrigeration unit on the main line is blocked, a portion of the chilled water can be directly sent to the air-cooling tower through the bypass line to ensure that the chilled water flow rate of the air-cooling tower meets the production process requirements, thereby preventing the outlet air temperature of the air-cooling tower from increasing, and further preventing the adsorption performance of the purified molecular sieve in the cryogenic oxygen pre-cooling system from decreasing.

[0018] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and other objects, features and advantages of the present application will become more apparent through a more detailed description of exemplary embodiments of the present application in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the present application.

[0020] Figure 1 This is a schematic diagram of the chilled water pipeline structure in the cryogenic oxygen pre-cooling system shown in an embodiment of the present application.

[0021] Figure numerals: 1 first refrigeration unit, 2 first water inlet manifold, 3 first water outlet manifold, 4 second refrigeration unit, 5 second water inlet manifold, 6 second water outlet manifold, 7 water outlet main pipe, 8 air cooling tower, 9 water inlet main pipe, 10 water pump, 11 first water inlet valve, 12 first water outlet valve, 13 second water inlet valve, 14 second water outlet valve, 15 water inlet main valve, 16 third water inlet pipe, 17 booster turbine expander unit, 18 third water inlet valve. DETAILED DESCRIPTION

[0022] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention 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 understood as limiting the present invention.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0024] In the present invention, unless otherwise expressly specified or limited, the terms "installed," "connected," "connected," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise expressly specified or limited. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0025] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0026] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples" or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0027] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

[0028] The above description is merely an optional embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

[0029] In order to make the purpose, technical solutions and beneficial effects of the present application clearer, the preferred embodiments of the present application will be described in detail below with reference to the accompanying drawings to facilitate understanding by technical personnel.

[0030] Example 1:

[0031] See also Figure 1 A chilled water piping structure in a cryogenic oxygen precooling system, the chilled water piping structure in the cryogenic oxygen precooling system comprising:

[0032] The first refrigeration unit 1 has a water inlet end connected to a first water inlet manifold 2 and a water outlet end connected to a first water outlet manifold 3;

[0033] The second refrigeration unit 4 has a water inlet end connected to a second water inlet manifold 5 and a water outlet end connected to a second water outlet manifold 6;

[0034] Among them, the first water outlet branch 3 and the second water outlet branch 6 are connected to the air cooling tower 8 through the water outlet main pipe 7, the first water inlet branch 2, the first water outlet branch 3 and the water outlet main pipe 7 constitute the main line, and the second water inlet branch 5, the second water outlet branch 6 and the water outlet main pipe 7 constitute the bypass line.

[0035] Specifically, the first water inlet manifold 2, the first water outlet manifold 3, and the outlet main pipe 7 constitute the main pipe. External water enters the first refrigeration unit 1 through the first water inlet manifold 2. After being processed by the first refrigeration unit 1, the resulting chilled water enters the outlet main pipe 7 through the first water outlet manifold 3 and then enters the air-cooling tower 8 through the outlet main pipe 7, thereby supplying water to the air-cooling tower 8.

[0036] The second water inlet manifold 5, the second water outlet manifold 6, and the water outlet main pipe 7 form a bypass line. External water enters the second refrigeration unit 4 through the second water inlet manifold 5. After being cooled by the second refrigeration unit 4, the resulting chilled water enters the water outlet main pipe 7 through the second water outlet manifold 6 and then enters the air-cooling tower 8 through the water outlet main pipe 7, thereby providing auxiliary water supply to the air-cooling tower 8.

[0037] The present application sets up a main line and a bypass line, and realizes auxiliary water supply to the air-cooling tower 8 through the bypass line. When the outlet pipe or heat exchanger of the first refrigeration unit 1 on the main line is blocked, a portion of the chilled water can be directly sent to the air-cooling tower 8 through the bypass line to ensure that the chilled water flow of the air-cooling tower 8 meets the production process requirements, thereby avoiding the increase of the outlet air temperature of the air-cooling tower 8 and further preventing the adsorption performance of the purified molecular sieve in the cryogenic oxygen pre-cooling system from decreasing.

[0038] Actual use effect: After the chilled water pipeline structure was put into use, the chilled water flow in the air cooling tower 8 was increased from 11.6m 3 / h increased to 15.2m 3 / h, and can be flexibly adjusted according to production process requirements. Due to the increase in chilled water flow, the outlet air temperature of air-cooling tower 8 dropped from 13°C to below 16°C, improving the adsorption performance of the purified molecular sieve. The molecular sieve regeneration cycle was adjusted from 320 minutes to 360 minutes, reducing the regenerative electric heating operating time by 1.2 hours per day. The three electric heating groups consumed 336kW.h of electricity, saving 403.2kW.h of electricity per day. Calculated at an electricity rate of 0.56 yuan / kW.h, this saves 82,414 yuan in electricity costs annually.

[0039] Example 2:

[0040] See also Figure 1 Based on the first embodiment, optionally, the first water inlet branch 2 and the second water inlet branch 5 are connected to a water pump 10 through a water inlet main pipe 9, and the water pump 10 is connected to a water source.

[0041] Specifically, the water inlet end of the water pump 10 is connected to the water source, and the water outlet end is connected to the water inlet main pipe 9. Through the action of the water pump 10, the external water source is sent into the first refrigeration unit 1 and the second refrigeration unit 4 through the water inlet main pipe 9, the first water inlet branch 2 and the second water inlet branch 5.

[0042] Optionally, a first water inlet valve 11 is provided on the first water inlet branch 2 , and a first water outlet valve 12 is provided on the first water outlet branch 3 .

[0043] Specifically, the first water inlet valve 11 controls the flow of the first water inlet manifold 2 and regulates the flow rate, thereby controlling the flow of water into the first refrigeration unit 1. The first water outlet valve 12 controls the flow of the first water outlet manifold 3 and regulates the flow rate, thereby controlling the flow of water out of the first refrigeration unit 1. The cooperation of the first water inlet valve 11 and the first water outlet valve 12 achieves operation and flow control of the main line.

[0044] Optionally, a second water inlet valve 13 is provided on the second water inlet branch 5 , and a second water outlet valve 14 is provided on the second water outlet branch 6 .

[0045] Specifically, the second water inlet valve 13 is used to control the flow of the second water inlet manifold 5, thereby controlling the flow of water into the second refrigeration unit 4. The second water outlet valve 14 is used to control the flow of the second water outlet manifold 6, thereby controlling the flow of water out of the second refrigeration unit 4. The cooperation between the second water inlet valve 13 and the second water outlet valve 14 enables operation and flow control of the bypass line.

[0046] Optionally, a main water inlet valve 15 is provided on the main water inlet pipe 9 .

[0047] Specifically, the water inlet main valve 15 is used to realize the cut-off control and flow regulation of the water inlet main pipe 9 .

[0048] Optionally, a third water inlet pipe 16 is connected in parallel to the water inlet main pipe 9 , and the third water inlet pipe 16 is connected to a booster turbine expander unit 17 .

[0049] Specifically, the booster turbine expander unit 17 is integrated with an expander, a booster and a cooler. In the booster turbine expander unit 17, the booster is used to compress the gas to the required high pressure, the expander expands the high-pressure gas to a low pressure through an adiabatic expansion process, and outputs mechanical energy at the same time, and the cooler is used to reduce the temperature of the gas at the outlet of the booster to ensure that the expander can operate normally and efficiently cool. The cooler usually takes the form of a heat exchanger, which exchanges heat with the high-temperature gas through a cooling medium (such as water, ethylene glycol, etc.), transfers the heat of the gas to the cooling medium, and thus reduces the temperature of the gas. In this embodiment, an external water source enters the cooler of the booster turbine expander unit 17 through the third water inlet pipe 16 to supply water thereto.

[0050] It should be noted that the booster turbine expander unit 17 is a component of the cryogenic oxygen precooling system.

[0051] Optionally, a third water inlet valve 18 is provided on the third water inlet pipe 16 .

[0052] Specifically, the third water inlet valve 18 is used to implement cut-off control and flow regulation of the third water inlet pipe 16 .

[0053] It should be noted that the structures and / or installation methods not detailed in this application are known to those skilled in the art in combination with common knowledge and / or existing technologies, and are not the focus of disclosure in this application and will not be further elaborated here.

[0054] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present application; the dimensions of the drawings are not related to the specific objects, and the dimensions of the objects can be changed arbitrarily.

Claims

1. A chilled water pipeline structure in a cryogenic oxygen precooling system, characterized in that: The chilled water pipeline structure in the cryogenic oxygen pre-cooling system includes: A first refrigeration unit (1), the water inlet end of which is connected to a first water inlet manifold (2), and the water outlet end of which is connected to a first water outlet manifold (3); A second refrigeration unit (4), the water inlet end of which is connected to a second water inlet manifold (5), and the water outlet end of which is connected to a second water outlet manifold (6); The first water outlet branch (3) and the second water outlet branch (6) are connected to the air cooling tower (8) via the outlet main pipe (7); the first water inlet branch (2), the first water outlet branch (3) and the outlet main pipe (7) constitute a main pipeline; the second water inlet branch (5), the second water outlet branch (6) and the outlet main pipe (7) constitute a bypass pipeline.

2. The chilled water pipeline structure in the cryogenic oxygen precooling system according to claim 1, characterized in that: The first water inlet branch (2) and the second water inlet branch (5) are connected to a water pump (10) via a water inlet main pipe (9), and the water pump (10) is connected to a water source.

3. The chilled water pipeline structure in the cryogenic oxygen precooling system according to claim 1, characterized in that: The first water inlet branch (2) is provided with a first water inlet valve (11), and the first water outlet branch (3) is provided with a first water outlet valve (12).

4. The chilled water pipeline structure in the cryogenic oxygen precooling system according to claim 1, characterized in that: The second water inlet branch (5) is provided with a second water inlet valve (13), and the second water outlet branch (6) is provided with a second water outlet valve (14).

5. The chilled water pipeline structure in the cryogenic oxygen pre-cooling system according to claim 2, characterized in that: The water inlet main pipe (9) is provided with a water inlet main valve (15).

6. The chilled water pipeline structure in the cryogenic oxygen precooling system according to claim 5, characterized in that: A third water inlet pipe (16) is also connected in parallel to the water inlet main pipe (9), and the third water inlet pipe (16) is connected to a booster turbine expansion unit (17).

7. The chilled water pipeline structure in the cryogenic oxygen pre-cooling system according to claim 6, characterized in that: The third water inlet pipe (16) is provided with a third water inlet valve (18).

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