Air separation nitrogen pressure air inlet system

Abstract

The utility model provides an air separation nitrogen pressure air inlet system which comprises multiple sets of air separation devices connected in parallel and a nitrogen compression device, the multiple sets of air separation devices are connected with the nitrogen compression device through multiple sets of pipeline systems, and each pipeline system comprises a first branch pipeline and a second branch pipeline which are arranged in parallel. The first branch pipeline and the second branch pipeline are connected to a nitrogen outlet of the same air separation device; the main pipeline is connected with the first branch pipeline and the second branch pipeline; the main pipeline is connected with the other end of the main pipeline, and the other end of the main pipeline is connected to an air inlet of the nitrogen compressor; the main pipelines in the multiple sets of pipeline systems are connected through a main communicating pipeline, and a main communicating pipeline valve is arranged on the main communicating pipeline. Nitrogen can still be normally conveyed from the air separation device through the first branch pipeline and the second branch pipeline which are arranged in parallel when any one of the branch pipelines breaks down, and through the arrangement of the main communicating pipeline and the communicating valve, it can be ensured that nitrogen input into the nitrogen compressor is not affected even if a certain main pipeline breaks down.

Description

Technical Field

[0001] The present application relates to the technical field of air intake systems of nitrogen compression systems of air separation systems, and more specifically, to an air separation nitrogen compression air intake system. Background Art

[0002] An air separation unit is an industrial device used to separate the various gas components in the air and produce oxygen, nitrogen, argon and other gases of the air components. The nitrogen compression device of the air separation system is used to compress nitrogen to a high pressure state.

[0003] The applicant's air separation workshop currently has two air separation units, one of which is equipped with a nitrogen compressor to supply 5.9MPa nitrogen to the outside. The inlet gas source of the nitrogen compression unit is the low-pressure nitrogen of the two air separation units, which passes through their respective pipeline valves and is combined and supplied through pipelines. Since it is controlled by a single valve, when the two air separation units are operating separately or one is operating normally and the other is starting, if there is a fault in a gas supply pipeline or a valve on the gas supply pipeline, the quality of the nitrogen delivered by the nitrogen compressor will decrease. Utility Model Content

[0004] The technical problem to be solved by the present application is to provide an air separation nitrogen compressed air intake system to solve the problem in the prior art that a valve on a certain air supply pipeline fails, resulting in a decrease in the quality of nitrogen delivered by the nitrogen compressor.

[0005] In order to solve the above problems, the present application provides an air separation nitrogen compressed air intake system, comprising: multiple sets of air separation units and a nitrogen compression device connected in parallel, the multiple sets of air separation units are connected to the nitrogen compression device through multiple sets of pipeline systems, wherein the pipeline system comprises: a first branch pipeline and a second branch pipeline arranged in parallel, the first branch pipeline and the second branch pipeline are connected to the nitrogen outlet of the same set of air separation units; a dry pipeline connected to the first branch pipeline and the second branch pipeline; a main pipeline connected to the other end of the dry pipeline, the other end of the main pipeline is connected to the air inlet of the nitrogen compression device; the dry pipelines in the multiple sets of pipeline systems are connected through a dry connecting pipeline, and a dry connecting pipe valve is arranged on the dry connecting pipeline.

[0006] According to the scheme, the continuity and stability of nitrogen supply are achieved through the design of independent pipeline systems, dry connecting pipelines and connecting valves. The first pipeline and the second pipeline are set in parallel to ensure that when any pipeline fails, nitrogen can still be normally transported from the air separation unit. Through the setting of dry connecting pipelines and connecting valves, even if a valve in a dry pipeline fails, the dry connecting pipeline and connecting valve can bypass the faulty pipeline to ensure that the nitrogen flow input to the nitrogen compressor is not affected, thereby ensuring that the quality of the nitrogen delivered by the nitrogen compressor is not affected.

[0007] In order to control the nitrogen passing through each branch pipe, an option of the present application is to set a first branch pipe valve on the first branch pipe; and set a second branch pipe valve on the second branch pipe.

[0008] In order to prevent a valve on a main line from malfunctioning, as an improvement to the above-mentioned solution of the present application, a first main line valve and a second main line valve are arranged in series on the main line, and the connection node between the main connecting line and the two main lines is located between the first main line valve and the second main line valve.

[0009] In order to control the total air intake of the nitrogen compression device, as an option of the above-mentioned solution of the present application, a main valve is set on the main pipeline.

[0010] In order to prevent a certain fault on the branch pipeline from affecting the operation of the entire branch pipeline, as an improvement on the above-mentioned scheme of the present application, a branch connecting pipeline is arranged between the first branch pipeline and the second branch pipeline, and a branch connecting pipeline valve is arranged on the branch connecting pipeline.

[0011] As a further improvement of the above branch pipeline scheme, a first branch pipe valve and a first branch pipe valve are arranged in series on the first branch pipeline; a second branch pipe valve and a second branch pipe valve are arranged in series on the second branch pipeline; the connection node of the branch connecting pipeline on the first branch pipeline is located between the first branch pipe valve and the first branch pipe valve; the connection node of the branch connecting pipeline on the second branch pipeline is located between the second branch pipe valve and the second branch pipe valve.

[0012] According to this scheme, the air separation nitrogen pressure intake system can more effectively deal with the situation of a valve failure on the branch pipeline. Through the design of the branch connecting pipeline, redundancy and fault isolation between the branch pipelines are achieved. Through the setting of the branch connecting pipeline and the branch connecting pipeline valve, even if a valve in a branch pipeline fails, the branch connecting pipeline and the branch connecting pipeline valve can be used to bypass the faulty pipeline to ensure that the nitrogen flow rate input to the nitrogen compressor is not affected, thereby further ensuring that the quality of the nitrogen delivered by the nitrogen compressor is not affected, and further improving the stability and reliability of the system.

[0013] The beneficial effects of this application are:

[0014] 1. The continuity and stability of nitrogen supply are achieved through the design of independent pipeline system and dry connecting pipeline and connecting valve. The first pipeline and the second pipeline are set in parallel to ensure that when any pipeline fails, nitrogen can still be normally transported from the air separation unit. Through the setting of dry connecting pipeline and connecting valve, even if a valve in a dry pipeline fails, the dry connecting pipeline and connecting valve can bypass the faulty pipeline to ensure that the nitrogen flow input to the nitrogen compressor is not affected, thereby ensuring that the quality of nitrogen delivered by the nitrogen compressor is not affected.

[0015] 2. The air separation nitrogen pressure intake system can more effectively deal with the situation of a valve failure on the branch pipeline. Through the design of the branch connecting pipeline, redundancy and fault isolation between the branch pipelines are achieved. Through the setting of the branch connecting pipeline and the branch connecting pipeline valve, even if a valve in a branch pipeline fails, the branch connecting pipeline and the branch connecting pipeline valve can bypass the faulty pipeline to ensure that the nitrogen flow input to the nitrogen compressor is not affected, thereby further ensuring that the quality of the nitrogen delivered by the nitrogen compressor is not affected, and further improving the stability and reliability of the system.

[0016] In addition to the technical problems solved by the utility model described above, the technical features that constitute the technical solution and the advantages brought by the technical features of these technical solutions, other technical problems that can be solved by the air separation nitrogen pressure intake system of the utility model, other technical features included in the technical solution and the advantages brought by these technical features will be further described in detail in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of an implementation scheme of the air separation nitrogen pressure intake system of the present application;

[0018] Figure 2 It is a schematic diagram of another embodiment of the air separation nitrogen pressure intake system of the present application;

[0019] In the figure:

[0020] 11;12, air separation unit;

[0021] 211;212, the first pipeline;

[0022] 212;222, the second pipeline;

[0023] 2111;2211, first branch valve;

[0024] 2121;2221, second branch valve;

[0025] 213;223, branch connecting pipeline;

[0026] 2131;2231, branch connecting pipeline valve;

[0027] 2111;2211, first branch pipe one valve;

[0028] 2112;2212, first branch pipe second valve;

[0029] 2211;2221, second branch pipe one valve;

[0030] 2212;2222, second branch pipe second valve;

[0031] 311;321, first main pipe valve;

[0032] 312;322, second main pipe valve;

[0033] 31;32, main pipeline;

[0034] 33. Dry connecting pipeline; 331. Dry connecting pipe valve;

[0035] 4. Main pipeline; 41. Main valve;

[0036] 5. Nitrogen compression device. DETAILED DESCRIPTION

[0037] The following is a detailed description of the embodiments of the technical solution of the present application in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application. In addition, the technical features involved in each embodiment of the utility model described below can be combined with each other as long as they do not conflict with each other.

[0038] like Figure 1 A schematic diagram of an embodiment of an air separation nitrogen pressure intake system provided by the present application is illustrated, and the air separation nitrogen pressure intake system comprises: two sets of air separation devices 11; 12 in parallel, which are respectively a first air separation device 11 and a second air separation device 12 of the air separation device, and a nitrogen compression device 5, wherein the first air separation device 11 and the second air separation device 12 are connected to the nitrogen compression device 5 through a pipeline, wherein the pipeline between the first air separation device 11 and the nitrogen compression device 5 comprises a first branch pipeline 211 and a second branch pipeline 212 arranged in parallel, and the first branch pipeline 211 and the second branch pipeline 212 are connected to the nitrogen outlet of the same set of air separation devices 11; a trunk pipeline 31 connected to the first branch pipeline 211 and the second branch pipeline 212; a main pipeline 4 connected to the other end of the trunk pipeline 31, and the other end of the main pipeline 4 is connected to the air inlet of the nitrogen compression device 5;

[0039] The pipeline between the second air separation device 12 and the nitrogen compression device 5 includes a first branch pipeline 221 and a second branch pipeline 222 arranged in parallel, the first branch pipeline 221 and the second branch pipeline 222 are connected to the nitrogen outlet of the same air separation device 12; a dry pipeline 32 connected to the first branch pipeline 221 and the second branch pipeline 222; a main pipeline 4 connected to the other end of the dry pipeline 32, and the other end of the main pipeline 4 is connected to the air inlet of the nitrogen compressor 5; the dry pipeline 31 between the first air separation device 11 and the main pipeline 4 and the dry pipeline 32 between the second air separation device 12 and the main pipeline 4 are connected through a dry connecting pipeline 33, and a dry connecting pipe valve 331 is provided on the dry connecting pipeline.

[0040] In this embodiment, there are two sets of air separation units in parallel in the system, namely, a first air separation unit 11 and a second air separation unit 12. The main function of these air separation units is to separate nitrogen and other components from air. The nitrogen compression device 5 is used to compress the nitrogen from the air separation unit to meet the needs of subsequent processes or uses.

[0041] The pipeline of the first air separation device 11 is divided into two parallel branch pipelines 211 and 212 from the nitrogen outlet of the first air separation device 11. The two branch pipelines are connected to the main pipeline 31, and the main pipeline 31 is connected to the air inlet of the nitrogen compression device 5 through the main pipeline 4.

[0042] The pipeline of the second air separation unit 12 is similar to that of the first air separation unit. The nitrogen outlet of the second air separation unit 12 also divides into two parallel branch pipelines 221 and 222, which are connected to another main pipeline 32. This main pipeline 32 is also connected to the main pipeline 4, and then connected to the air inlet of the nitrogen compression device 5.

[0043] A dry connecting pipeline 33 is provided between the dry pipelines 31 and 32 of the two air separation units, and a dry connecting pipe valve 331 is installed on the pipeline. This design allows the dry pipelines of the two air separation units to be connected by opening the dry connecting pipe valve 331 when necessary. Through the setting of the dry connecting pipeline 33 and the dry connecting pipe valve 331, even if a valve of a dry pipeline fails, the dry connecting pipeline and the connecting valve can be used to bypass the failed pipeline, thereby ensuring that the nitrogen flow rate input to the nitrogen compressor is not affected.

[0044] This embodiment ensures that when any one of the pipelines fails, nitrogen can still be normally transported from the air separation unit by means of the first pipeline and the second pipeline arranged in parallel. By means of the arrangement of the dry connecting pipeline and the connecting valve, even when a valve of a dry pipeline fails, the dry connecting pipeline and the connecting valve can be used to bypass the failed pipeline, thereby ensuring that the nitrogen flow rate input to the nitrogen compressor is not affected, thereby ensuring that the quality of the nitrogen delivered by the nitrogen compressor is not affected.

[0045] In order to control the nitrogen passing through each branch pipe, Figure 1 A first branch pipe valve is provided on the first branch pipe 211 leading out of the first air separation unit 11; a second branch pipe valve is provided on the second branch pipe 212. A first branch pipe valve is provided on the first branch pipe 221 leading out of the second air separation unit 12; a second branch pipe valve is provided on the second branch pipe 222. Through the provision of these valves, the operator can independently control the passage of nitrogen on each branch pipe, and each branch pipe valve can be opened or closed as required.

[0046] like Figure 1In one embodiment, a first dry pipe valve 311 and a second dry pipe valve 312 are arranged in series on the dry pipe 31 led out from the first air separation device 11, and a first dry pipe valve 321 and a second dry pipe valve 322 are arranged in series on the dry pipe 32 led out from the second air separation device 12. The node where one end of the dry connecting pipe 33 is connected to the dry pipe 31 led out from the first air separation device 11 is located between the first dry pipe valve 311 and the second dry pipe valve 312, and the node where the other end of the dry connecting pipe 33 is connected to the dry pipe 32 led out from the second air separation device 12 is located between the first dry pipe valve 321 and the second dry pipe valve 322.

[0047] On the dry pipeline 31 drawn from the first air separation unit 11, a first dry pipeline valve 311 and a second dry pipeline valve 312 are arranged in series. The two valves are respectively located at different positions of the dry pipeline 31, and are used to independently control the flow of nitrogen on the dry pipeline. Similarly, on the dry pipeline 32 drawn from the second air separation unit 12, a first dry pipeline valve 321 and a second dry pipeline valve 322 are also arranged in series. The two valves are also respectively located at different positions of the dry pipeline 32 to achieve the control of the flow of nitrogen on the dry pipeline. The dry connecting pipeline 33 is a redundant design for connecting the dry pipelines of two sets of air separation units, and the node at which one end of the dry pipeline 33 is connected to the dry pipeline 31 drawn from the first air separation unit 11 is located between the first dry pipeline valve 311 and the second dry pipeline valve 312. In this way, even if any one of the first dry pipeline valve 311 or the second dry pipeline valve 312 is closed, the dry connecting pipeline 33 can still access nitrogen from the other side of the dry pipeline 31. The node where the other end of the dry connecting pipeline 33 is connected to the dry pipeline 32 led out of the second air separation unit 12 is located between the first dry pipeline valve 321 and the second dry pipeline valve 322. Similarly, such a design can ensure that even if any one of the first dry pipeline valve 321 or the second dry pipeline valve 322 is closed, the dry connecting pipeline 33 can still be connected to nitrogen from the other side of the dry pipeline 32.

[0048] With this configuration, the system has higher flexibility and reliability. Under normal circumstances, each main pipe valve can be opened or closed as needed to adjust the distribution and flow of nitrogen. When a main pipeline or branch pipeline fails, the valve on the main connecting pipeline can be opened to supplement with nitrogen from another air separation unit, thus ensuring the continuity and stability of the system.

[0049] In addition, this design also facilitates the maintenance and overhaul of the system. When a main pipeline or branch pipeline needs to be maintained or overhauled, the corresponding valve can be closed to isolate the part that needs maintenance without affecting the normal operation of the entire system.

[0050] like Figure 1~2 The total air intake of the nitrogen compression device 5 is controlled by setting a main valve 41 on the main pipeline 4.

[0051] Refer to Figure 2 In another embodiment, a branch connecting pipeline 213 is provided between the first branch pipeline 211 and the second branch pipeline 212 led out from the first air separation device 11, and a branch connecting pipeline valve 2131 is provided on the branch connecting pipeline 213. A branch connecting pipeline 223 is provided between the first branch pipeline 212 and the second branch pipeline 222 led out from the second air separation device 12, and a branch connecting pipeline valve 2231 is provided on the branch connecting pipeline 223.

[0052] A first branch pipe valve 2111 and a first branch pipe valve 2112 are arranged in series on the first branch pipe 211 led out from the first air separation device 11; a second branch pipe valve 2211 and a second branch pipe valve 2212 are arranged in series on the second branch pipe 212; a connection node of the branch connecting pipeline 213 on the first branch pipe 211 is located between the first branch pipe valve 2111 and the first branch pipe valve 2112; a connection node of the branch connecting pipeline 213 on the second branch pipe 212 is located between the second branch pipe valve 2211 and the second branch pipe valve 2212.

[0053] A first branch pipe valve 2211 and a first branch pipe valve 2212 are arranged in series on the first branch pipe 212 led out from the second air separation device 12; a second branch pipe valve 2221 and a second branch pipe valve 2222 are arranged in series on the second branch pipe 222; a connection node of the branch connecting pipeline 23 on the first branch pipe 212 is located between the first branch pipe valve 2211 and the first branch pipe valve 2212; a connection node of the branch connecting pipeline 223 on the second branch pipe 222 is located between the second branch pipe valve 2221 and the second branch pipe valve 2222.

[0054] In the air separation nitrogen pressure intake system provided in this embodiment, it is possible to more effectively cope with the situation of a valve failure on a branch pipeline. Through the design of the branch connecting pipeline, redundancy and fault isolation between the branch pipelines are achieved. Through the arrangement of the branch connecting pipeline and the branch connecting pipeline valve, even when a valve in a branch pipeline fails, the branch connecting pipeline and the branch connecting pipeline valve can be used to bypass the faulty pipeline, thereby ensuring that the nitrogen flow rate input to the nitrogen compressor is not affected, thereby further ensuring that the quality of the nitrogen delivered by the nitrogen compressor is not affected, and further improving the stability and reliability of the system.

[0055] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0056] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "setting", "connection", "installation" and the like should be understood in a broad sense, for example, they can be fixedly connected, detachably connected, or integrated; they can be directly connected, or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in the field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model.

Claims

1. An air separation nitrogen pressure intake system, comprising: A plurality of air separation devices (11; 12) connected in parallel and a nitrogen compression device (5), wherein the plurality of air separation devices and the nitrogen compression device are connected via a plurality of pipeline systems, characterized in that: The pipeline system comprises: a first pipeline (211; 212) and a second pipeline (221; 222) arranged in parallel, wherein the first pipeline (211; 212) and the second pipeline (221; 222) are connected to the nitrogen outlet of the same air separation device (11; 12); A main pipeline (31; 32) connected to the first pipeline (211; 212) and the second pipeline (221; 222); A main pipeline (4) connected to the other end of the main pipeline (31; 32), wherein the other end of the main pipeline (4) is connected to the air inlet of the nitrogen compression device (5); The dry pipelines (31; 32) in the plurality of pipeline systems are connected via a dry connecting pipeline (33), and a dry connecting pipeline valve (331) is provided on the dry connecting pipeline.

2. The air separation nitrogen pressure intake system according to claim 1, characterized in that: A first branch pipe valve is provided on the first branch pipe (211; 212); and a second branch pipe valve is provided on the second branch pipe (221; 222).

3. The air separation nitrogen pressure intake system according to claim 1, characterized in that: A first dry pipe valve (311; 321) and a second dry pipe valve (312; 322) are arranged in series on the dry pipe (31; 32), and a connection node between the dry connecting pipe (33) and the two dry pipes (31; 32) is located between the first dry pipe valve (311; 321) and the second dry pipe valve (312; 322).

4. The air separation nitrogen pressure intake system according to claim 1, characterized in that: A main valve (41) is provided on the main pipeline (4).

5. The air separation nitrogen pressure intake system according to claim 1, characterized in that: A branch connecting pipeline (213; 223) is provided between the first branch pipeline (211; 212) and the second branch pipeline (221; 222), and a branch connecting pipeline valve (2131; 2231) is provided on the branch connecting pipeline (213; 223).

6. The air separation nitrogen pressure intake system according to claim 5, characterized in that: The first branch pipe (211; 212) is provided with a first branch pipe first valve (2111; 2211) and a first branch pipe second valve (2112; 2212) in series; The second branch pipe (221; 222) is provided with a second branch pipe first valve (2211; 2221) and a second branch pipe second valve (2212; 2222) in series; The connection node of the branch connecting pipeline (213; 223) on the first branch pipeline (211; 212) is located between the first branch pipe valve (2111; 2211) and the first branch pipe valve (2112; 2212); The connection node of the branch connecting pipeline (213; 223) on the second branch pipeline (221; 222) is located between the second branch pipe first valve (2211; 2221) and the second branch pipe second valve (2212; 2222).

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