Nitrogen supply system

Abstract

The utility model provides a nitrogen supply system, and relates to the technical field of liquid nitrogen storage tanks. The nitrogen supply system comprises a liquid nitrogen storage tank and a nitrogen supply part; the liquid nitrogen storage tank is communicated with a first pipeline and a second pipeline, the first pipeline is communicated with a low-pressure nitrogen pipe network, and the second pipeline is communicated with the gasifier; the nitrogen supply part is respectively communicated with the first pipeline and the second pipeline, so that low-pressure nitrogen and ultrahigh-pressure nitrogen can be respectively supplied to the low-pressure nitrogen pipe network and the gasification furnace when the liquid nitrogen storage tank is emptied, isolated and maintained. The technical problems that in the prior art, due to the situations that cold insulation materials of a liquid nitrogen storage tank in a nitrogen supply system lose efficacy or the interior leaks, emptying isolation maintenance needs to be conducted, supply of low-pressure nitrogen and ultrahigh-pressure nitrogen is cut off, and potential safety hazards are brought are solved.

Description

Technical Field

[0001] This application relates to the technical field of liquid nitrogen storage tanks, and particularly to a nitrogen supply system. Background Art

[0002] As a cryogenic liquid, liquid nitrogen is used in many fields such as scientific research, medical treatment, biotechnology, and semiconductor manufacturing. In order to safely store liquid nitrogen at extremely low temperatures and minimize the evaporation loss of liquid nitrogen, a nitrogen supply system usually sets up a liquid nitrogen storage tank to store liquid nitrogen.

[0003] The existing nitrogen supply system can supply emergency low-pressure nitrogen to the whole plant and ultra-high-pressure nitrogen required for nitrogen sealing to the gasifier. However, due to the failure of the cold insulation material or internal leakage of the liquid nitrogen storage tank, etc., it is necessary to empty and isolate for maintenance, resulting in the interruption of the supply of low-pressure nitrogen and ultra-high-pressure nitrogen, bringing potential safety hazards.

[0004] Therefore, the above problems need to be solved urgently. Utility Model Content

[0005] The purpose of the embodiments of this application is to provide a nitrogen supply system to solve the technical problem that in the existing nitrogen supply system, due to the failure of the cold insulation material or internal leakage of the liquid nitrogen storage tank, etc., it is necessary to empty and isolate for maintenance, resulting in the interruption of the supply of low-pressure nitrogen and ultra-high-pressure nitrogen, bringing potential safety hazards.

[0006] The technical solution is as follows:

[0007] This application provides a nitrogen supply system, including:

[0008] A liquid nitrogen storage tank, which is connected to a first pipeline and a second pipeline. The first pipeline is connected to a low-pressure nitrogen pipeline network, and the second pipeline is connected to a gasifier;

[0009] A nitrogen supply unit, which is respectively connected to the first pipeline and the second pipeline to be able to supply low-pressure nitrogen and ultra-high-pressure nitrogen to the low-pressure nitrogen pipeline network and the gasifier respectively when the liquid nitrogen storage tank is emptied and isolated for maintenance.

[0010] In some embodiments, for the aforementioned nitrogen supply system, the nitrogen supply unit includes: a liquid nitrogen tank truck and a multi-way pipe fitting. The multi-way pipe fitting is at least connected to the liquid nitrogen tank truck, the first pipeline, and the second pipeline at the same time. When the liquid nitrogen storage tank is emptied and isolated for maintenance, the liquid nitrogen tank truck supplies low-pressure nitrogen and ultra-high-pressure nitrogen to the low-pressure nitrogen pipeline network and the gasifier respectively through the multi-way pipe fitting.

[0011] In some embodiments, for the aforementioned nitrogen supply system, the multi-way pipe fitting has a first branch pipe orifice, a second branch pipe orifice, and a third branch pipe orifice. The first branch pipe orifice is connected to a liquid nitrogen tank truck to form a third pipeline. The second branch pipe orifice and the third branch pipe orifice are respectively connected to the first pipeline and the second pipeline to form a fourth pipeline and a fifth pipeline. When the liquid nitrogen storage tank is emptied and isolated for maintenance, the fourth pipeline and the fifth pipeline can supply low-pressure nitrogen and ultra-high-pressure nitrogen to a low-pressure nitrogen gas network and a gasifier respectively through the liquid nitrogen tank truck.

[0012] In some embodiments, for the aforementioned nitrogen supply system, the multi-way pipe fitting further has a fourth branch pipe orifice. The fourth branch pipe orifice is connected to an input pipeline of the liquid nitrogen storage tank to form a sixth pipeline. The sixth pipeline can maintain the liquid level of the liquid nitrogen tank truck through the third pipeline.

[0013] In some embodiments, for the aforementioned nitrogen supply system, a first shut-off valve, a second shut-off valve, a third shut-off valve, and a fourth shut-off valve are respectively arranged on the third pipeline, the fourth pipeline, the fifth pipeline, and the sixth pipeline.

[0014] In some embodiments, for the aforementioned nitrogen supply system, a low-pressure emergency nitrogen pump and a first inlet valve are arranged on the first pipeline. The fourth pipeline is connected to the first pipeline in front of the first inlet valve.

[0015] In some embodiments, for the aforementioned nitrogen supply system, a high-pressure emergency nitrogen pump and a second inlet valve are arranged on the second pipeline. The fifth pipeline is connected to the second pipeline in front of the second inlet valve.

[0016] In some embodiments, for the aforementioned nitrogen supply system, it further includes: a controller, which is in signal connection with the first shut-off valve, the second shut-off valve, the third shut-off valve, the fourth shut-off valve, the first inlet valve, and the second inlet valve.

[0017] In some embodiments, for the aforementioned nitrogen supply system, the liquid nitrogen tank truck is further connected to a seventh pipeline. The seventh pipeline is connected to an externally supplied liquid nitrogen to maintain the liquid level of the liquid nitrogen tank truck in a state where the sixth pipeline is cut off.

[0018] In some embodiments, for the aforementioned nitrogen supply system, the multi-way pipe fitting, the first shut-off valve, the second shut-off valve, the third shut-off valve, the fourth shut-off valve, the third pipeline, the fourth pipeline, the fifth pipeline, the sixth pipeline, and the seventh pipeline are all made of low-temperature resistant stainless steel.

[0019] Through the above technical solutions, a nitrogen supply system of the present application has at least the following advantages:

[0020] The present application provides a nitrogen supply system, which includes a liquid nitrogen storage tank and a nitrogen supply unit; the liquid nitrogen storage tank is connected to a first pipeline and a second pipeline, the first pipeline is connected to a low-pressure nitrogen pipeline network, and the second pipeline is connected to a gasifier; the nitrogen supply unit is respectively connected to the first pipeline and the second pipeline, so as to be able to supply low-pressure nitrogen and ultra-high-pressure nitrogen to the low-pressure nitrogen pipeline network and the gasifier respectively when the liquid nitrogen storage tank is emptied and isolated for maintenance. By adding a nitrogen supply unit in the present application, when the liquid nitrogen storage tank cannot supply low-pressure nitrogen and ultra-high-pressure nitrogen to the low-pressure nitrogen pipeline network and the gasifier respectively due to the failure of the cold insulation material or internal leakage, etc., the nitrogen supply unit can be used as a new supply source to meet the low-pressure nitrogen supply demand of the low-pressure nitrogen pipeline network and the ultra-high-pressure nitrogen supply demand of the gasifier. Through the application of the present application, the technical problem in the prior art that in the nitrogen supply system, due to the failure of the cold insulation material or internal leakage of the liquid nitrogen storage tank, etc., it is necessary to carry out emptying and isolation maintenance, resulting in the interruption of the supply of low-pressure nitrogen and ultra-high-pressure nitrogen, bringing potential safety hazards, is solved.

[0021] The above description is only an overview of the technical solution of the present application. In order to be able to understand the technical means of the present application more clearly and implement it according to the content of the specification, the following takes the preferred embodiments of the present application and combines the accompanying drawings to describe in detail as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the prior art, the following will briefly introduce the drawings required to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present disclosure. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 Schematically shows a structural diagram of a nitrogen supply system provided by an embodiment of the present application.

[0024] Description of the reference numerals:

[0025] 1. Liquid nitrogen storage tank; 11. First pipeline; 12. Second pipeline; 13. Input pipeline; 111. Low-pressure emergency nitrogen pump; 112. First inlet valve; 121. High-pressure emergency nitrogen pump; 122. Second inlet valve;

[0026] 2. Low-pressure nitrogen pipeline network;

[0027] 3. Gasifier;

[0028] 4. Nitrogen supply unit; 41. Liquid nitrogen tank truck; 42. Multi-way pipe fitting; 411. Seventh pipeline; 421. First branch pipe orifice; 422. Second branch pipe orifice; 423. Third branch pipe orifice; 424. Fourth branch pipe orifice; 4211. Third pipeline; 4212. First cut-off valve; 4221. Fourth pipeline; 4222. Second cut-off valve; 4231. Fifth pipeline; 4232. Third cut-off valve; 4241. Sixth pipeline; 4242. Fourth cut-off valve. Detailed implementation manners

[0029] The following further describes the implementation manners of the present disclosure in detail with reference to the drawings and embodiments. The detailed descriptions and drawings of the following embodiments are used to exemplarily illustrate the principles of the present disclosure, but cannot be used to limit the scope of the present disclosure. The present disclosure can be implemented in many different forms, not limited to the specific embodiments disclosed herein, but including all technical solutions falling within the scope of the claims.

[0030] These embodiments are provided by the present disclosure to make the present disclosure thorough and complete, and to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that: unless otherwise specifically stated, the relative arrangements of components and steps, the components of materials, numerical expressions and values described in these embodiments should be construed as merely exemplary, rather than as limitations.

[0031] It should be noted that in the description of the present disclosure, unless otherwise specified, the meaning of "a plurality of" is greater than or equal to two; the orientation or positional relationships indicated by terms such as "upper", "lower", "left", "right", "inner", "outer", etc. are only for the convenience of describing the present disclosure 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 thus cannot be construed as a limitation of the present disclosure. When the absolute position of the described object changes, the relative position relationship may also change accordingly.

[0032] In addition, the "first", "second" and similar terms used in the present disclosure do not denote any order, quantity or importance, but are only used to distinguish different parts. "Vertical" is not strictly vertical, but within the allowable error range. "Parallel" is not strictly parallel, but within the allowable error range. Terms such as "including" or "comprising" mean that the elements before this term cover the elements listed after this term, and do not exclude the possibility of also covering other elements.

[0033] It should also be noted that in the description of the present disclosure, unless otherwise clearly specified and limited, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a direct connection, or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances. When it is described that a specific device is located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device.

[0034] All terms used in the present disclosure have the same meanings as those understood by those of ordinary skill in the art to which the present disclosure pertains, unless otherwise specifically defined. It should also be understood that terms defined in a general dictionary, for example, should be interpreted as having meanings consistent with their meanings in the context of the relevant art, and should not be interpreted in an idealized or overly formal sense, unless specifically defined as such here.

[0035] Technologies, methods, and devices known to those of ordinary skill in the relevant fields may not be discussed in detail, but where appropriate, the technologies, methods, and devices should be regarded as part of the specification.

[0036] As Figure 1 shown, the present application provides a nitrogen supply system, including a liquid nitrogen storage tank 1 and a nitrogen supply unit 4; the liquid nitrogen storage tank 1 is connected to a first pipeline 11 and a second pipeline 12. The first pipeline 11 is connected to a low-pressure nitrogen pipeline network 2, and the second pipeline 12 is connected to a gasifier 3; the nitrogen supply unit 4 is respectively connected to the first pipeline 11 and the second pipeline 12, so as to be able to supply low-pressure nitrogen and ultra-high-pressure nitrogen to the low-pressure nitrogen pipeline network 2 and the gasifier 3 respectively when the liquid nitrogen storage tank 1 is emptied and isolated for maintenance.

[0037] Specifically, the liquid nitrogen storage tank 1 is connected to a first pipeline 11 and a second pipeline 12 to supply low-pressure nitrogen and ultra-high-pressure nitrogen to the low-pressure nitrogen pipeline network 2 and the gasifier 3 respectively during normal operation. However, due to situations such as the failure of the cold insulation material or internal leakage, when the liquid nitrogen storage tank 1 needs to be emptied and isolated for maintenance, in order to avoid the interruption of the supply of low-pressure nitrogen and ultra-high-pressure nitrogen, which may pose a safety hazard, the nitrogen supply system of the present application is additionally provided with a nitrogen supply unit 4. The nitrogen supply unit 4 is respectively connected to the first pipeline 11 and the second pipeline 12, so as to supply low-pressure nitrogen and ultra-high-pressure nitrogen to the low-pressure nitrogen pipeline network 2 and the gasifier 3 respectively instead of the liquid nitrogen storage tank 1.

[0038] The nitrogen supply section 4 can be a supply source added to this application. Through Y-shaped, reducing three-way pipe fittings, four-way pipe fittings, five-way pipe fittings, etc., or multi-way connectors, multi-way distributors, multi-way collectors, etc., the connection between the first pipeline 11 and the second pipeline 12 can be realized, and thus it can be connected to the low-pressure nitrogen pipeline network 2 and the gasifier 3 through two pipelines with one supply source at the same time. And during the working process of the nitrogen supply section 4, it can also supply low-pressure nitrogen only to the low-pressure nitrogen pipeline network 2, supply ultra-high-pressure nitrogen only to the gasifier 3, or supply low-pressure nitrogen and ultra-high-pressure nitrogen to the low-pressure nitrogen pipeline network 2 and the gasifier 3 at the same time. Moreover, the nitrogen supply section 4 can also be two supply sources added to this application, which are respectively connected to the first pipeline 11 and the second pipeline 12 to achieve separate corresponding supply, or this application is provided with two supply sources and one or more spare supply sources other than that. The spare supply source can be a liquid nitrogen replenishment source purchased externally, or a temporary liquid nitrogen source for emergency backup of the nitrogen supply system. It can also be connected to the liquid nitrogen recovery system in the liquid nitrogen production line, such as specifically not limited, as long as it can provide a new supply source to meet the low-pressure nitrogen supply demand of the low-pressure nitrogen pipeline network 2 and the ultra-high-pressure nitrogen supply demand of the gasifier 3.

[0039] This application provides a nitrogen supply system, including a liquid nitrogen storage tank 1 and a nitrogen supply section 4; the liquid nitrogen storage tank 1 is connected to a first pipeline 11 and a second pipeline 12, the first pipeline 11 is connected to the low-pressure nitrogen pipeline network 2, and the second pipeline 12 is connected to the gasifier 3; the nitrogen supply section 4 is respectively connected to the first pipeline 11 and the second pipeline 12 to be able to supply low-pressure nitrogen and ultra-high-pressure nitrogen to the low-pressure nitrogen pipeline network 2 and the gasifier 3 respectively when the liquid nitrogen storage tank 1 is emptied and isolated for maintenance. By adding the nitrogen supply section 4 in this application, when the liquid nitrogen storage tank 1 is emptied and isolated for maintenance and cannot supply low-pressure nitrogen and ultra-high-pressure nitrogen to the low-pressure nitrogen pipeline network 2 and the gasifier 3 respectively, the nitrogen supply section 4 can be used as a new supply source to meet the low-pressure nitrogen supply demand of the low-pressure nitrogen pipeline network 2 and the ultra-high-pressure nitrogen supply demand of the gasifier 3. Through the application of this application, the technical problem in the prior art that in the nitrogen supply system, due to the failure of the cold insulation material or internal leakage of the liquid nitrogen storage tank 1, etc., it is necessary to empty and isolate for maintenance, resulting in the interruption of the supply of low-pressure nitrogen and ultra-high-pressure nitrogen, bringing potential safety hazards, is solved.

[0040] As Figure 1 shown, in some embodiments, the nitrogen supply section 4 includes: a liquid nitrogen tank truck 41 and a multi-way pipe fitting 42. The multi-way pipe fitting 42 is at least connected to the liquid nitrogen tank truck 41, the first pipeline 11 and the second pipeline 12 at the same time. When the liquid nitrogen storage tank 1 is emptied and isolated for maintenance, the liquid nitrogen tank truck 41 supplies low-pressure nitrogen and ultra-high-pressure nitrogen to the low-pressure nitrogen pipeline network 2 and the gasifier 3 respectively through the multi-way pipe fitting 42.

[0041] Specifically, in order to provide a new supply source to supply low-pressure nitrogen and ultra-high-pressure nitrogen to the low-pressure nitrogen pipeline network 2 and the gasifier 3 respectively when the liquid nitrogen storage tank 1 is emptied, isolated and repaired, the nitrogen supply section 4 of the present application includes a liquid nitrogen tank truck 41 and a multi-way pipe fitting 42. The liquid nitrogen tank truck 41 replaces the liquid nitrogen storage tank 1 as the new supply source, thus avoiding the interruption of nitrogen supply and ensuring the reliability and continuity of the nitrogen supply system. And through the setting of the multi-way pipe fitting 42, the operator can easily switch the nitrogen supply path, so as to realize the supply of low-pressure nitrogen only to the low-pressure nitrogen pipeline network 2, the supply of ultra-high-pressure nitrogen only to the gasifier 3, or the supply of low-pressure nitrogen and ultra-high-pressure nitrogen to the low-pressure nitrogen pipeline network 2 and the gasifier 3 at the same time, improving the flexibility and operation convenience of the nitrogen supply system.

[0042] In order to enable the liquid nitrogen tank truck 41 to supply low-pressure nitrogen and ultra-high-pressure nitrogen to the low-pressure nitrogen pipeline network 2 and the gasifier 3 respectively after connecting the multi-way pipe fitting 42. The multi-way pipe fitting 42 can be a Y-shaped, reducing tee pipe fitting, four-way pipe fitting, five-way pipe fitting, etc., and realizes the flow and convergence of multiple pipelines through corresponding numbers of openings. It can also be a multi-way joint, multi-way distributor, multi-way collector, etc., which is not specifically limited, as long as it can supply low-pressure nitrogen and ultra-high-pressure nitrogen to the low-pressure nitrogen pipeline network 2 and the gasifier 3 respectively after the liquid nitrogen tank truck 41 is connected.

[0043] As Figure 1 shown, in some embodiments, the multi-way pipe fitting 42 has a first branch pipe orifice 421, a second branch pipe orifice 422 and a third branch pipe orifice 423. The first branch pipe orifice 421 is connected to the liquid nitrogen tank truck 41 to form a third pipeline 4211. The second branch pipe orifice 422 and the third branch pipe orifice 423 are respectively communicated with the first pipeline 11 and the second pipeline 12 to form a fourth pipeline 4221 and a fifth pipeline 4231. The fourth pipeline 4221 and the fifth pipeline 4231 can supply low-pressure nitrogen and ultra-high-pressure nitrogen to the low-pressure nitrogen pipeline network 2 and the gasifier 3 respectively through the liquid nitrogen tank truck 41 when the liquid nitrogen storage tank 1 is emptied, isolated and repaired.

[0044] Specifically, in the present application, the multi-way pipe fitting 42 has a first branch pipe orifice 421, a second branch pipe orifice 422 and a third branch pipe orifice 423, which are respectively used to connect the liquid nitrogen tank truck 41, the low-pressure nitrogen pipeline network 2 and the gasifier 3. Through the setting of multiple branch pipe orifices of the multi-way pipe fitting 42, the efficient connection between the liquid nitrogen tank truck 41 and the low-pressure nitrogen pipeline network 2 and the gasifier 3 is realized, ensuring that nitrogen can be supplied continuously during the emptying, isolation and repair of the liquid nitrogen storage tank 1. And the fourth pipeline 4221 and the fifth pipeline 4231 formed by the second branch pipe orifice 422 and the third branch pipe orifice 423 being respectively communicated with the first pipeline 11 and the second pipeline 12. The operator can control the switching of the nitrogen supply path by controlling the fourth pipeline 4221 and the fifth pipeline 4231, improving the flexibility and operation convenience of the nitrogen supply system.

[0045] As Figure 1 shown, in some embodiments, the multi-way pipe fitting 42 further has a fourth branch pipe orifice 424, and the fourth branch pipe orifice 424 is connected to the input pipeline 13 of the liquid nitrogen storage tank 1 to form a sixth pipeline 4241, and the sixth pipeline 4241 can maintain the liquid level of the liquid nitrogen tank truck 41 through the third pipeline 4211.

[0046] Specifically, in order to replenish liquid nitrogen to the liquid nitrogen tank truck 41 and maintain the liquid level of the liquid nitrogen tank truck 41, so that the liquid nitrogen tank truck 41 can meet the low-pressure nitrogen supply demand of the low-pressure nitrogen pipeline network 2 and the ultra-high-pressure nitrogen supply demand of the gasifier 3 when the liquid nitrogen storage tank 1 is emptied and isolated for maintenance, the multi-way pipe fitting 42 in the present application further has a fourth branch pipe orifice 424. The multi-way pipe fitting 42 can be a four-way pipe fitting or a five-way, six-way, etc. pipe fitting, which is not specifically limited, as long as it can provide a fourth branch pipe orifice 424 for connecting the input pipeline 13 of the liquid nitrogen storage tank 1 to form a sixth pipeline 4241. The input pipeline 13 of the liquid nitrogen storage tank 1 is a pipeline for outputting the rectification tower liquid nitrogen by-product from the air separation rectification tower to the liquid nitrogen storage tank 1. One end of the input pipeline 13 is connected to the main condenser-evaporator of the rectification tower, and the other end is connected to the liquid nitrogen storage tank 1. In the present application, the input pipeline 13 is connected through the sixth pipeline 4241, so that the rectification tower liquid nitrogen by-product output by the main condenser-evaporator of the rectification tower can be input into the liquid nitrogen tank truck 41 through the sixth pipeline 4241 to maintain the liquid nitrogen supply capacity of the liquid nitrogen tank truck 41.

[0047] As Figure 1 shown, in some embodiments, a first shut-off valve 4212, a second shut-off valve 4222, a third shut-off valve 4232, and a fourth shut-off valve 4242 are respectively arranged on the third pipeline 4211, the fourth pipeline 4221, the fifth pipeline 4231, and the sixth pipeline 4241.

[0048] Specifically, in order to improve the safety and reliability of the nitrogen supply system in the present application, a first shut-off valve 4212, a second shut-off valve 4222, a third shut-off valve 4232, and a fourth shut-off valve 4242 are respectively arranged on the third pipeline 4211, the fourth pipeline 4221, the fifth pipeline 4231, and the sixth pipeline 4241. By switching the opening and closing states of different shut-off valves, the on-off states of different pipelines can be controlled, which is convenient for the control and adjustment of nitrogen supply. And by accurately controlling the opening degree of the start valve, the nitrogen supply system can meet the nitrogen supply demand when the liquid nitrogen storage tank 1 is emptied and isolated for maintenance, improving the overall production efficiency and safety of the system.

[0049] As Figure 1 shown, in some embodiments, a low-pressure emergency nitrogen pump 111 and a first inlet valve 112 are arranged on the first pipeline 11, and the fourth pipeline 4221 is connected to the first pipeline 11 in front of the first inlet valve 112.

[0050] Specifically, to enhance the safety of the nitrogen supply system of the present application, a low-pressure emergency nitrogen pump 111 and a first inlet valve 112 are provided on the first pipeline 11. The fourth pipeline 4221 is connected to the first pipeline 11 in front of the first inlet valve 112. When it is necessary to supply low-pressure nitrogen to the low-pressure nitrogen pipeline network 2, by opening the first cut-off valve 4212, opening the second cut-off valve 4222, and opening the first inlet valve 112, the liquid nitrogen tank truck 41 is connected to the low-pressure nitrogen pipeline network 2. The low-pressure emergency nitrogen pump 111 can ensure that during the emptying and isolation maintenance of the liquid nitrogen storage tank 1, the supply through the liquid nitrogen tank truck 41 can be ensured by immediately starting and quickly switching the liquid nitrogen source to ensure the normal operation of the low-pressure nitrogen pipeline network 2. Moreover, the low-pressure emergency nitrogen pump 111 can maintain the pressure stability in the low-pressure nitrogen pipeline network 2, improving the overall reliability of the system. The first inlet valve 112, as a control point, can ensure the safety and controllability of the system, avoiding pressure fluctuations and liquid nitrogen backflow. The fourth pipeline 4221 is connected to the first pipeline 11 in front of the first inlet valve 112, enabling the operator to control the supply of low-pressure nitrogen according to actual needs, enhancing the flexibility of system operation on the basis of maintaining the above technical effects of the system.

[0051] As Figure 1 shown, in some embodiments, a high-pressure emergency nitrogen pump 121 and a second inlet valve 122 are provided on the second pipeline 12. The fifth pipeline 4231 is connected to the second pipeline 12 in front of the second inlet valve 122.

[0052] Specifically, to enhance the safety of the nitrogen supply system of the present application, a high-pressure emergency nitrogen pump 121 and a second inlet valve 122 are provided on the second pipeline 12. The fifth pipeline 4231 is connected to the second pipeline 12 in front of the second inlet valve 122. When it is necessary to supply ultra-high-pressure nitrogen to the high-pressure nitrogen pipeline network for the gasifier 3 that requires ultra-high-pressure nitrogen supply, by opening the first cut-off valve 4212, opening the third cut-off valve 4232, and opening the first inlet valve 112, the liquid nitrogen tank truck 41 is connected to the gasifier 3 that requires ultra-high-pressure nitrogen supply. The high-pressure emergency nitrogen pump 121 can ensure that during the emptying and isolation maintenance of the liquid nitrogen storage tank 1, the supply through the liquid nitrogen tank truck 41 can be ensured by immediately starting and quickly switching the liquid nitrogen source to ensure the normal operation of the gasifier 3. Moreover, the high-pressure emergency nitrogen pump 121 can maintain the pressure stability of the gasifier 3, improving the overall reliability of the system. The second inlet valve 122, as a control point, can ensure the safety and controllability of the system, avoiding pressure fluctuations and liquid nitrogen backflow. The fifth pipeline 4231 is connected to the second pipeline 12 in front of the second inlet valve 122, enabling the operator to control the supply of the corresponding ultra-high-pressure nitrogen according to actual needs, enhancing the flexibility of system operation on the basis of maintaining the above technical effects of the system.

[0053] In some embodiments, it further includes: a controller, which is in signal connection with the first cut-off valve 4212, the second cut-off valve 4222, the third cut-off valve 4232, the fourth cut-off valve 4242, the first inlet valve 112, and the second inlet valve 122.

[0054] Specifically, in order to achieve the automatic control of the nitrogen supply system, the present application is also provided with a controller, which is in signal connection with the first cut-off valve 4212, the second cut-off valve 4222, the third cut-off valve 4232, the fourth cut-off valve 4242, the first inlet valve 112, and the second inlet valve 122. It can centrally manage and control the opening and closing states of each valve, and can also achieve remote control operations to meet the low-pressure nitrogen supply requirements of the low-pressure nitrogen pipeline network 2 and the ultra-high-pressure nitrogen supply requirements of the gasifier 3 in a predetermined manner.

[0055] As Figure 1 shown, in some embodiments, the liquid nitrogen tank truck 41 is further connected to a seventh pipeline 411, and the seventh pipeline 411 is connected to an external liquid nitrogen supply to maintain the liquid level of the liquid nitrogen tank truck 41 in the cut-off state of the sixth pipeline 4241.

[0056] Specifically, in one embodiment considered by the present application, when the liquid nitrogen storage tank 1 needs to be emptied and isolated for maintenance due to the failure of the cold insulation material or internal leakage, etc., and the air separation rectification tower fails and needs to be shut down, in order to maintain the liquid nitrogen supply capacity of the liquid nitrogen tank truck 41, the present application further connects a seventh pipeline 411 to the liquid nitrogen tank truck 41. The seventh pipeline 411 is connected to an external liquid nitrogen supply to maintain the liquid level of the liquid nitrogen tank truck 41 in the cut-off state of the sixth pipeline 4241. The external liquid nitrogen supply can be a liquid nitrogen supply source purchased externally, a temporary liquid nitrogen source for emergency backup of the nitrogen supply system, or can be connected to the liquid nitrogen recovery system in the liquid nitrogen production line to reduce waste and improve resource utilization rate. There is no specific limitation, as long as it can maintain the liquid level of the liquid nitrogen tank truck 41 to meet the low-pressure nitrogen supply requirements of the low-pressure nitrogen pipeline network 2 and the ultra-high-pressure nitrogen supply requirements of the gasifier 3.

[0057] In some embodiments, the multi-way pipe fitting 42, the first cut-off valve 4212, the second cut-off valve 4222, the third cut-off valve 4232, the fourth cut-off valve 4242, the third pipeline 4211, the fourth pipeline 4221, the fifth pipeline 4231, the sixth pipeline 4241, and the seventh pipeline 411 are all made of low-temperature resistant stainless steel.

[0058] Specifically, considering the property of liquid nitrogen as a cryogenic liquid and ensuring the safety of the nitrogen supply system during the process of supplying emergency low-pressure nitrogen to the whole plant and ultra-high-pressure nitrogen required for nitrogen sealing to the gasifier 3. The multi-way pipe fittings 42, cut-off valves, and pipelines in the newly added nitrogen supply section 4 of this application are all made of low-temperature-resistant stainless steel to provide good low-temperature toughness for the multi-way pipe fittings 42, cut-off valves, and pipelines, avoiding brittle fracture during transportation. Moreover, the stainless steel material endows the newly added multi-way pipe fittings 42, cut-off valves, and pipelines with good corrosion resistance, preventing chemical reactions with liquid nitrogen and ensuring the safe and stable operation of the system.

[0059] So far, the embodiments of the present disclosure have been described in detail. To avoid obscuring the concept of the present disclosure, some details well known in the art have not been described. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein based on the above description.

[0060] Although some specific embodiments of the present disclosure have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and not for limiting the scope of the present disclosure. Those skilled in the art should understand that the above embodiments can be modified or partial technical features can be equivalently replaced without departing from the scope and spirit of the present disclosure. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way.

Claims

1. A nitrogen supply system, characterized in that, Including: A liquid nitrogen storage tank (1), the liquid nitrogen storage tank (1) is connected with a first pipeline (11) and a second pipeline (12), the first pipeline (11) is connected with a low-pressure nitrogen pipeline network (2), and the second pipeline (12) is connected with a gasifier (3); A nitrogen supply unit (4), the nitrogen supply unit (4) is respectively connected with the first pipeline (11) and the second pipeline (12) to be able to supply low-pressure nitrogen and ultra-high-pressure nitrogen to the low-pressure nitrogen pipeline network (2) and the gasifier (3) respectively when the liquid nitrogen storage tank (1) is emptied and isolated for maintenance.

2. The nitrogen supply system according to claim 1, wherein The nitrogen supply unit (4) includes: A liquid nitrogen tank truck (41) and a multi-way pipe fitting (42), the multi-way pipe fitting (42) is at least simultaneously connected with the liquid nitrogen tank truck (41), the first pipeline (11) and the second pipeline (12). When the liquid nitrogen storage tank (1) is emptied and isolated for maintenance, the liquid nitrogen tank truck (41) supplies the low-pressure nitrogen and the ultra-high-pressure nitrogen to the low-pressure nitrogen pipeline network (2) and the gasifier (3) respectively through the multi-way pipe fitting (42).

3. The nitrogen supply system according to claim 2, wherein The multi-way pipe fitting (42) has a first branch pipe orifice (421), a second branch pipe orifice (422) and a third branch pipe orifice (423). The first branch pipe orifice (421) is connected with the liquid nitrogen tank truck (41) to form a third pipeline (4211). The second branch pipe orifice (422) and the third branch pipe orifice (423) are respectively connected with the first pipeline (11) and the second pipeline (12) to form a fourth pipeline (4221) and a fifth pipeline (4231). The fourth pipeline (4221) and the fifth pipeline (4231) can supply the low-pressure nitrogen and the ultra-high-pressure nitrogen to the low-pressure nitrogen pipeline network (2) and the gasifier (3) respectively through the liquid nitrogen tank truck (41) when the liquid nitrogen storage tank (1) is emptied and isolated for maintenance.

4. The nitrogen supply system according to claim 3, wherein The multi-way pipe fitting (42) further has a fourth branch pipe orifice (424), the fourth branch pipe orifice (424) is connected with an input pipeline (13) of the liquid nitrogen storage tank (1) to form a sixth pipeline (4241), and the sixth pipeline (4241) can maintain the liquid level of the liquid nitrogen tank truck (41) through the third pipeline (4211).

5. The nitrogen supply system according to claim 4, wherein A first cut-off valve (4212), a second cut-off valve (4222), a third cut-off valve (4232) and a fourth cut-off valve (4242) are respectively arranged on the third pipeline (4211), the fourth pipeline (4221), the fifth pipeline (4231) and the sixth pipeline (4241).

6. The nitrogen supply system according to claim 5, wherein A low-pressure accident nitrogen pump (111) and a first inlet valve (112) are arranged on the first pipeline (11), and the fourth pipeline (4221) is connected with the first pipeline (11) in front of the first inlet valve (112).

7. The nitrogen supply system according to claim 6, wherein: a high-pressure emergency nitrogen pump (121) and a second inlet valve (122) are provided on the second pipeline (12), and the fifth pipeline (4231) is connected to the second pipeline (12) in front of the second inlet valve (122).

8. The nitrogen supply system according to claim 7, wherein It further includes: a controller, which is in signal connection with the first cut-off valve (4212), the second cut-off valve (4222), the third cut-off valve (4232), the fourth cut-off valve (4242), the first inlet valve (112) and the second inlet valve (122).

9. The nitrogen supply system according to claim 8, wherein: the liquid nitrogen tank truck (41) is further connected with a seventh pipeline (411), and the seventh pipeline (411) is connected to an externally supplied liquid nitrogen to maintain the liquid level of the liquid nitrogen tank truck (41) when the sixth pipeline (4241) is in a cut-off state.

10. The nitrogen supply system according to claim 9, wherein: the multi-way pipe fitting (42), the first cut-off valve (4212), the second cut-off valve (4222), the third cut-off valve (4232) and the fourth cut-off valve (4242), the third pipeline (4211), the fourth pipeline (4221), the fifth pipeline (4231), the sixth pipeline (4241) and the seventh pipeline (411) are all made of low-temperature resistant stainless steel.

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