Air supply system for air separation workshop

Abstract

The utility model provides an air separation workshop air supply system which comprises a main air separation air compression system and a plurality of standby air separation air compression systems connected with the main air separation air compression system in parallel, and further comprises a liquid nitrogen gasification system connected with the main air separation air compression system in parallel, and the liquid nitrogen gasification system is connected with a liquid nitrogen storage device. And the main air separation air compression system, the standby air separation air compression system and the liquid nitrogen gasification system are connected with the air supply pipeline. Due to the fact that the liquid nitrogen gasification system adopts a gasification system which is different from a main air separation air compression system and a standby air separation air compression system in principle and different in working mode, the capability of dealing with sudden failures is improved due to the introduction of the liquid nitrogen gasification system. When the main air separation and air compression system and the standby air separation and air compression system both break down, the liquid nitrogen gasification system can be quickly started to provide temporary gas supply for a workshop, and it is ensured that production cannot be completely interrupted.

Description

Technical Field

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

[0002] In a synthetic ammonia plant, an air separation system is used in the air separation workshop to provide nitrogen, plant air, instrument air, etc. to the plant area.

[0003] Although the air separation workshop has multiple sets of air separation systems as backup, in actual production there have been cases where multiple sets of backup air separation systems in the entire air separation workshop have experienced abnormal trips due to other faults, resulting in production interruptions. Therefore, even if multiple sets of backup air separation systems are set up, there is no guarantee that the backup systems will be 100% successfully started or that 100% of the backup systems can operate normally. Utility Model Content

[0004] The purpose of this application is to solve the problem in the background technology that after the air separation system of the air separation workshop fails, it cannot guarantee 100% successful startup of the backup system or 100% normal operation of the backup system, resulting in the inability to carry out the entire production, and propose a new air supply system for the air separation workshop.

[0005] In order to achieve the above-mentioned purpose, the present application provides an air delivery system for an air separation workshop, comprising: a main air separation air compression system, and multiple sets of backup air separation air compression systems arranged in parallel with the main air separation air compression system, and also comprising a liquid nitrogen gasification system arranged in parallel with the main air separation air compression system, the liquid nitrogen gasification system is connected to a liquid nitrogen storage device, and the main air separation air compression system, the backup air separation air compression system, and the liquid nitrogen gasification system are connected to an air delivery pipeline.

[0006] According to the above scheme of the present application, the liquid nitrogen gasification system includes a spirally arranged coil, the coil has a feed port and an air outlet, the feed port is connected to the liquid nitrogen storage device, the air outlet is connected to the air supply pipeline, and a plurality of fins are arranged on the outside of the coil.

[0007] According to the above solution of the present application, the coil is composed of straight pipes and bent pipes, and the bent pipes are used to connect the straight pipes arranged in parallel.

[0008] According to the above solution of the present application, the straight pipe and the curved pipe are connected via a flange.

[0009] According to the above solution of the present application, a fixing plate is arranged on the outer side of the straight pipe body, and the coil is installed on the frame through the fixing plate.

[0010] According to the above solution of the present application, the frame includes a column and a support body, the support body is composed of a plurality of grids, and a single straight tube is arranged in a single grid.

[0011] The beneficial effects of this application are:

[0012] In the air supply system for the air separation workshop provided by the present application, when the main system is operating normally, the backup system and the liquid nitrogen gasification system are in standby state; when the main system fails, the backup system can be quickly started and take over the gas supply task; if the backup system is also unable to operate normally, the liquid nitrogen gasification system can provide a temporary gas supply. Since the liquid nitrogen gasification system adopts a gasification system with different principles and different working modes from the main air separation air compression system and the backup air separation air compression system, the introduction of the liquid nitrogen gasification system improves the ability to cope with sudden failures. When both the main air separation air compression system and the backup air separation air compression system fail, the liquid nitrogen gasification system can be quickly started to provide a temporary gas supply for the workshop to ensure that production will not be completely interrupted.

[0013] 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 supply system for an air separation workshop 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

[0014] Figure 1 This is a schematic diagram of the air supply system of the air separation workshop in the embodiment of the present application;

[0015] Figure 2 This is a schematic diagram of the axial side of the liquid nitrogen gasification system of the air separation workshop in the embodiment of the present application;

[0016] Figure 3 yes Figure 2 Enlarged image at a;

[0017] Figure 4 It is a front view schematic diagram of the liquid nitrogen gasification system of the air separation workshop in the embodiment of the present application;

[0018] Figure 5 yes Figure 4 Enlarged image at b;

[0019] Figure 6 is a schematic diagram of a frame in an embodiment of the present application;

[0020] Description of reference numerals:

[0021] 1. Main air separation and air compression system;

[0022] 2. Standby air separation and air compression system;

[0023] 3. Liquid nitrogen gasification system; 31. Coil; 301. Feed inlet; 302. Gas outlet; 303. Fins; 304. Fixed plate; 311. Straight pipe; 312. Bend pipe;

[0024] 4. Liquid nitrogen storage device;

[0025] 5. Air supply pipeline;

[0026] 6. frame; 61. column; 62. support body; 621. grid;

[0027] 7. Liquid nitrogen production system;

[0028] 8. Factory gas usage unit. DETAILED DESCRIPTION

[0029] 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.

[0030] like Figure 1 The embodiment of the air supply system of an air separation workshop of the present application is illustrated, and the air supply system of the air separation workshop comprises: a main air separation air compression system 1, and a plurality of backup air separation air compression systems 2 are arranged in parallel with the main air separation air compression system 1, and is characterized in that it also comprises a liquid nitrogen gasification system 3 arranged in parallel with the main air separation air compression system 1, the liquid nitrogen gasification system 3 is connected to a liquid nitrogen storage device 4, and the main air separation air compression system 1, the backup air separation air compression system 2, and the liquid nitrogen gasification system 3 are connected to an air supply pipeline 5.

[0031] The air supply system for an air separation workshop provided in this embodiment is intended to solve the uncertainty problem of the startup and operation of the backup system after the air separation system of the air separation workshop fails in the prior art, which may cause the entire production process to be seriously affected. In order to overcome this technical difficulty, the present application proposes an innovative design scheme for the air supply system for an air separation workshop. The system is mainly composed of the following parts: a main air separation air compression system 1, which is the main air supply system during normal production of the workshop and is responsible for providing a stable gas supply. Multiple sets of backup air separation air compression systems 2 are arranged in parallel with the main air separation air compression system 1. These backup systems can be quickly started when the main system fails, take over the work of the main system, and ensure the continuity of production. By setting in parallel, these backup systems can operate independently without interfering with each other, thereby improving the reliability and stability of the system. In addition, the innovation of this embodiment is that a liquid nitrogen gasification system 3 is also introduced, and the liquid nitrogen gasification system 3 is connected to a liquid nitrogen storage device 4, which can quickly convert the stored liquid nitrogen into a gaseous state to provide the necessary gas for the workshop. The liquid nitrogen in the liquid nitrogen storage device 4 comes from the liquid nitrogen normally produced in the factory. In the factory, the liquid nitrogen storage device 4 can be a tank or a tank.

[0032] Since the liquid nitrogen gasification system 3 adopts a gasification system with different principles and different working modes, the introduction of the liquid nitrogen gasification system 3 improves the ability to cope with sudden failures. When both the main air separation and air compression system 1 and the backup air separation and air compression system 2 fail, the liquid nitrogen gasification system 3 can be quickly started to provide temporary gas supply for the workshop to ensure that production will not be completely interrupted.

[0033] In this embodiment, the main air separation air compression system 1, the backup air separation air compression system 2 and the liquid nitrogen gasification system 3 are all connected to the gas delivery pipeline 5 through the valve control system, and the gas supply mode is adjusted according to actual needs. When the main system operates normally, the backup system and the liquid nitrogen gasification system are in standby mode; when the main system fails, the backup system can be quickly started and take over the gas supply task; if the backup system also fails to operate normally, the liquid nitrogen gasification system can provide temporary gas supply.

[0034] The air supply system for the air separation workshop proposed in this embodiment introduces a liquid nitrogen gasification system 3 and is arranged in parallel with the main air separation air compression system 1 and the backup air separation air compression system 2, thereby effectively solving the uncertainty problem of the startup and operation of the backup system in the prior art and improving the reliability and stability of the entire production process.

[0035] like Figure 2-Figure 5 The liquid nitrogen gasification system 3 in this embodiment is illustrated, and the liquid nitrogen gasification system 3 includes a spirally arranged coil 31, the coil has a feed port 301 and an air outlet 302, the feed port 301 is connected to the liquid nitrogen storage device 4, the air outlet 302 is connected to the air supply pipeline 5, and a plurality of fins 303 are arranged on the outside of the coil 31.

[0036] Liquid nitrogen gasification system 3 is one of the key parts for solving the air separation system failure problem in the air separation workshop in this application. The main function of this system is to convert the liquid nitrogen in the liquid nitrogen storage device 4 into gaseous nitrogen, and safely and effectively send it to the air delivery pipeline 5 for use in the air separation workshop. The coil 31 arranged in a spiral arrangement increases the area of ​​contact between liquid nitrogen and the external environment, improves the gasification efficiency, and also makes the system structure more compact and saves space. The coil 31 has a feed port 301 and an air outlet 302, which are respectively responsible for the input of liquid nitrogen and the output of gaseous nitrogen. Specifically, the feed port 301 is connected to the liquid nitrogen storage device 4 to ensure a stable supply of liquid nitrogen. When liquid nitrogen enters the coil 31 from the liquid nitrogen storage device 4 through the feed port 301, due to the special spiral design of the coil, the liquid nitrogen continuously exchanges heat with the external environment during the flow process, thereby realizing the conversion from liquid to gaseous. The air outlet 302 is connected to the air delivery pipeline 5 to send the gasified nitrogen into the air separation workshop. In this way, even if the main air separation and air compression system or the backup air separation and air compression system fails, the liquid nitrogen gasification system can be started quickly to provide a stable gas supply for the workshop.

[0037] In addition, a plurality of fins 303 are provided on the outside of the coil 31. These fins 303 can further increase the contact area between the coil 31 and the external environment, accelerate the heat exchange process, and improve the gasification efficiency. The liquid nitrogen gasification system 3 in this embodiment improves the heat transfer structure through the coil 31 design and the fins 303, realizes the efficient gasification of liquid nitrogen, and ensures the stable output of nitrogen after vaporization.

[0038] In an optional improved embodiment, the coil 31 is composed of a straight pipe 311 and a curved pipe 312, and the curved pipe 312 is used to connect the straight pipes arranged in parallel. The straight pipe 311 and the curved pipe 312 are connected by a flange.

[0039] In an optional improved embodiment, a fixing plate 304 is provided on the outer side of the straight tube 311, and the coil is installed on the frame 6 through the fixing plate 304. Figure 6 The frame 6 includes a column 61 and a support body 62 . The support body 62 is composed of a plurality of grids 621 . A single straight tube 311 is arranged in a single grid 621 .

[0040] 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.

[0041] In the description of the embodiments of the present application, the orientations or positional relationships indicated by technical terms such as "upper", "lower", "inside" and "outside" are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the embodiments of the present application and simplifying the description. They do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0042] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "set", "provided with", "connected", "installed" 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.

[0043] 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 supply system for an air separation workshop, comprising: A main air separation compression system (1), and a plurality of backup air separation compression systems (2) arranged in parallel with the main air separation compression system (1), characterized in that it also includes a liquid nitrogen gasification system (3) arranged in parallel with the main air separation compression system (1), the liquid nitrogen gasification system (3) is connected to a liquid nitrogen storage device (4), and the main air separation compression system (1), the backup air separation compression system (2), and the liquid nitrogen gasification system (3) are connected to an air supply pipeline (5).

2. The air supply system for an air separation workshop according to claim 1 is characterized in that: The liquid nitrogen gasification system (3) comprises a spirally arranged coil (31), the coil having a feed inlet (301) and a gas outlet (302), the feed inlet (301) being connected to the liquid nitrogen storage device (4), the gas outlet (302) being connected to the gas delivery pipeline (5), and a plurality of fins (303) being arranged on the outside of the coil (31).

3. The air supply system for an air separation workshop according to claim 2 is characterized in that: The coil (31) is composed of a straight pipe (311) and a bent pipe (312), and the bent pipe (312) is used to connect the straight pipes arranged in parallel.

4. The air supply system for an air separation workshop according to claim 3 is characterized in that: The straight pipe (311) and the curved pipe (312) are connected via a flange.

5. The air supply system for air separation workshop according to claim 3 is characterized in that: A fixing plate (304) is arranged on the outer side of the straight tube (311) body, and the coil is installed on the frame (6) via the fixing plate (304).

6. The air supply system for an air separation workshop according to claim 5, characterized in that: The frame (6) comprises a column (61) and a support body (62), wherein the support body (62) is composed of a plurality of grids (621), and a single straight tube (311) is arranged in a single grid (621).

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