Spatial arrangement structure of natural gas net liquefaction system

Abstract

The utility model discloses a spatial arrangement structure of a natural gas purification liquefaction system. An M01 natural gas dehydration pry, an M02 natural gas deacidification pry and an M03 natural gas deacidification tower pry are arranged in the front of a natural gas purification part side by side; an amine buffer tank and a fuel gas tank are sequentially arranged behind the M03 natural gas deacidification tower pry; the regeneration tower top cooler and the lean amine liquid cooler are positioned on the upper layer of the M02 natural gas deacidification pry and are sequentially arranged from front to back; the regeneration gas cooler is located at the rear position of the upper layer of the M01 natural gas dehydration pry; the M04 precooling compressor pry, the M05 main cooling compressor pry and the M06 evaporator pry are arranged in the front of the natural gas liquefaction part side by side, and the M07 cold box and the busbar pry are sequentially arranged behind the M06 evaporator pry; the EAG heater is positioned behind the M04 precooling compressor pry; the precooling compressor air cooler is located on the upper layer of the M04 precooling compressor pry, the upper layer of the M05 main cooling compressor pry and the upper layer of the M06 evaporator pry. The natural gas net liquefaction system is compact and reasonable in spatial arrangement structure, highly integrated, small in occupied area, low in manufacturing cost and easy to install.

Description

Technical Field

[0001] This utility model relates to the field of natural gas liquefaction equipment, specifically to the spatial arrangement structure of a natural gas purification liquefaction system. Background Technology

[0002] The natural gas purification and liquefaction system comprises a natural gas purification section and a natural gas liquefaction section. The natural gas purification section includes: M01 natural gas dehydration skid, M02 natural gas deacidification skid, M03 natural gas deacidification tower skid, amine buffer tank, fuel gas tank, regeneration tower top cooler, lean amine liquid cooler, and regeneration gas cooler. The natural gas liquefaction section includes: M04 pre-cooling compressor skid, M05 main cooling compressor skid, M06 evaporator skid, M07 cold box, EAG heater, manifold skid, and pre-cooling compressor air cooler. The existing natural gas purification and liquefaction system has an unreasonable and non-compact spatial layout, resulting in a large footprint and a significant amount of piping, steel structures, and instrumentation cables used between units, greatly increasing the difficulty and workload of on-site installation. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a compact, reasonable, highly integrated spatial layout structure for a natural gas purification and liquefaction system that can reduce the system's footprint, manufacturing costs, and installation.

[0004] To solve the above problems, the technical solution adopted by this utility model is as follows: a spatial arrangement structure of a natural gas purification and liquefaction system, comprising: a natural gas purification section and a natural gas liquefaction section located behind the natural gas purification section. The natural gas purification section includes: an M01 natural gas dehydration skid, an M02 natural gas deacidification skid, an M03 natural gas deacidification tower skid, an amine buffer tank, a fuel gas tank, a regeneration tower top cooler, a lean amine liquid cooler, and a regeneration gas cooler. The natural gas liquefaction section includes: an M04 pre-cooling compressor skid, an M05 main cooling compressor skid, an M06 evaporator skid, an M07 cold box, an EAG heater, a manifold skid, and a pre-cooling compressor air cooler. The key feature is that the M01 natural gas dehydration skid, the M02 natural gas deacidification skid, and the M03 natural gas deacidification tower skid are arranged side-by-side in front of the natural gas purification section; the M03 natural gas deacidification tower skid is positioned rearwards. The components are arranged in sequence: amine buffer tank and fuel gas tank; regeneration tower top cooler and lean amine liquid cooler are located on the upper layer of M02 natural gas deacidification skid and arranged from front to back; regeneration gas cooler is located on the upper layer of M01 natural gas dehydration skid, towards the rear; M04 precooling compressor skid, M05 main cooling compressor skid, and M06 evaporator skid are arranged side by side at the front of the natural gas liquefaction section, with M07 cold box and manifold skid following behind M06 evaporator skid; EAG heater is located behind M04 precooling compressor skid; precooling compressor air cooler is located on the upper layer of M04 precooling compressor skid, M05 main cooling compressor skid, and M06 evaporator skid; in addition, M01 natural gas dehydration skid, M02 natural gas deacidification skid, M03 natural gas deacidification tower skid, M04 precooling compressor skid, M05 main cooling compressor skid, and M06 evaporator skid are connected as a whole by steel structure.

[0005] Furthermore, in the aforementioned spatial layout structure of the natural gas purification and liquefaction system, the natural gas purification section and the natural gas liquefaction section are directly connected by a pipe gallery, which is used to connect the pipelines, instrument cable trays and electrical cable trays of the natural gas purification section and the natural gas liquefaction section.

[0006] Furthermore, in the aforementioned spatial layout structure of the natural gas purification and liquefaction system, the pipe rack is arranged in two layers: the lower layer houses the process pipelines, and the upper layer houses the instrument cable trays and electrical cable trays. The pipe racks in the natural gas purification section are rooted in the M01 natural gas dehydration skid and the M02 natural gas deacidification skid, while the pipe racks in the natural gas liquefaction section are rooted in the M04 precooling compressor skid and the M06 evaporator skid, using the skid steel structure frame as the support for the pipe racks.

[0007] Furthermore, in the aforementioned spatial layout structure of the natural gas purification and liquefaction system, the lower part of the pipe gallery serves as an inspection passage. The pipe gallery, while accommodating the arrangement of process pipelines, instrument cable trays, and electrical cable trays between units, has a width of not less than 1.5 meters and a height of not less than 2 meters, thereby accommodating personnel passage.

[0008] Furthermore, in the aforementioned spatial arrangement of the natural gas purification system, the pipe interfaces within each skid used for connecting to the pipe gallery all face the pipe gallery, facilitating direct connection between each skid and the pipe gallery.

[0009] Furthermore, in the aforementioned spatial layout structure of the natural gas purification system, the M04 precooling compressor skid, the M05 main refrigeration compressor skid, and the M06 evaporator skid are all designed with steel structure frames. The three steel structure frames are interconnected by steel structures and are at the same height to support the precooling compressor air cooler.

[0010] The advantages of this utility model are: the spatial layout of the natural gas purification and liquefaction system is compact and reasonable, highly integrated, and makes full use of the upper space, resulting in a small system footprint; it mainly adopts a skid-mounted layout, and the relative positions of the devices are designed according to the process route, resulting in less material used for pipelines, steel structures, and instrumentation cables between devices, greatly reducing the amount of on-site installation work and solving on-site construction costs; the natural gas purification and liquefaction system adopts a skid-mounted and modular design, which facilitates transportation, hoisting, placement, disassembly, and relocation. Attached Figure Description

[0011] Figure 1 This is a three-dimensional structural diagram of the spatial arrangement of the natural gas purification and liquefaction system described in this utility model.

[0012] Figure 2 This is a top view of the spatial arrangement of the natural gas purification and liquefaction system described in this utility model.

[0013] Figure 3 This is a side view of the spatial arrangement of the natural gas purification and liquefaction system described in this utility model. Detailed Implementation

[0014] The present invention will now be described in further detail with reference to specific embodiments and accompanying drawings.

[0015] like Figure 1 , Figure 2 , Figure 3As shown, the spatial layout of the natural gas purification and liquefaction system includes: a natural gas purification section 20 and a natural gas liquefaction section 21 located behind the natural gas purification section 20. The natural gas purification section 20 includes: M01 natural gas dehydration skid 1, M02 natural gas deacidification skid 2, M03 natural gas deacidification tower skid 3, amine buffer tank 8, fuel gas tank 9, regeneration tower top cooler 11, lean amine liquid cooler 12, and regeneration gas cooler 13. The natural gas liquefaction section 21 includes: M04 precooling compressor skid 4, M05 main refrigeration compressor skid 5, M06 evaporator skid 6, M07 cold box 7, EAG heater 14, manifold skid 10, and precooling compressor air cooler 15. M01 natural gas dehydration skid 1, M02 natural gas deacidification skid 2, and M03 natural gas deacidification tower skid 3 are arranged side by side at the front of the natural gas purification section 20; behind M03 natural gas deacidification tower skid 3 are amine buffer tank 8 and fuel gas tank 9; regeneration tower top cooler 11 and lean amine liquid cooler 12 are located on the upper layer of M02 natural gas deacidification skid 2 and are arranged from front to back; regeneration gas cooler 13 is located on the upper layer of M01 natural gas dehydration skid 1 at the rear; M04 precooling compressor skid 4, M05 main cooling compressor skid 5, and M06 evaporator skid 6 are arranged side by side. At the front of the natural gas liquefaction section 21, M06 evaporator skid 6 is followed by M07 cold box 7 and manifold skid 10; EAG heater 14 is located behind M04 precooling compressor skid 4; precooling compressor air cooler 15 is located above M04 precooling compressor skid 4, M05 main refrigeration compressor skid 5 and M06 evaporator skid 6; in addition, M01 natural gas dehydration skid 1, M02 natural gas deacidification skid 2, M03 natural gas deacidification tower skid 3, M04 precooling compressor skid 4, M05 main refrigeration compressor skid 5 and M06 evaporator skid 6 are connected as one unit by steel structure.

[0016] In this embodiment, the natural gas purification section 20 and the natural gas liquefaction section 21 are directly connected through the pipe gallery 16, which is used to connect the pipes, instrument cable trays and electrical cable trays of the natural gas purification section 20 and the natural gas liquefaction section 21.

[0017] The pipe rack 16 is arranged in two layers, with process pipelines on the lower layer and instrument cable trays and electrical cable trays on the upper layer. The pipe rack 16 on the natural gas purification section 20 is rooted in the M01 natural gas dehydration skid 1 and the M02 natural gas deacidification skid 2. The pipe rack 16 on the natural gas liquefaction section 21 is rooted in the M04 precooling compressor skid 4 and the M06 evaporator skid 6. The skid steel structure frame is used as the support for the pipe rack 16.

[0018] The lower part of the pipe gallery 16 is an inspection passage. Under the premise of accommodating the arrangement of process pipelines, instrument cable trays and electrical cable trays in the unit, the pipe gallery 16 has a width of not less than 1.5 meters and a height of not less than 2 meters, so as to meet the passage of personnel.

[0019] The pipe interfaces inside each skid that are used to connect to the pipe rack 16 all face the pipe rack 16, so that each skid can be directly connected through the pipe rack 16.

[0020] The M04 precooling compressor skid 4, the M05 main refrigeration compressor skid 5, and the M06 evaporator skid 6 are all designed with steel structure frames. The three steel structure frames are connected to each other as one unit and are at the same height to support the precooling compressor air cooler 15.

[0021] The M06 evaporator skid 6 is located at the center of the natural gas purification and liquefaction system, allowing it to connect to the purified gas outlet of the M01 natural gas dehydration skid 1. After being pre-cooled by the M06 evaporator skid 6, the purified gas can enter the M07 cold box liquefaction system. The M06 evaporator skid 6 can also connect to the M04 pre-cooling compressor skid 4, and at the same time, it can also connect to the M05 main refrigeration compressor skid 5.

[0022] The working principle is as follows: Raw natural gas enters M01 natural gas dehydration skid 1 from pipe gallery 16. The skid pre-treats the raw natural gas by filtering, separating, and metering. Then, the raw natural gas enters the amine absorption tower of M03 natural gas deacidification tower skid 3 for deacidification and then returns to M01 natural gas dehydration skid 1. In M01 natural gas dehydration skid 1, it undergoes dehydration and mercury removal through molecular sieves. M02 natural gas deacidification skid 2 and M03 natural gas deacidification tower skid 3 are natural gas MDEA deacidification systems. After the raw natural gas is deacidified and purified by M01 natural gas dehydration skid 1, M02 natural gas deacidification skid 2 and M03 natural gas deacidification tower skid 3, it enters M06 evaporator skid 6 from M01 natural gas dehydration skid 1 through pipe gallery 16 for pre-cooling. The evaporator skid undergoes three-stream heat exchange through the evaporator. The cooling capacity is provided by M04 pre-cooling compressor skid 4 through compression and expansion. The pre-cooling refrigerant can be amine or propane. The other pre-cooled medium is a mixed refrigerant, pressurized and air-cooled after passing through the M05 main refrigeration compressor skid 5. This mixed refrigerant is primarily composed of methane, propane, ethylene, and nitrogen in a specific ratio. Natural gas, after pre-cooling through the M06 evaporator skid 6, enters the M07 cold box 7 for liquefaction. Simultaneously, the mixed refrigerant, after pre-cooling through the M06 evaporator skid 6, enters the M07 cold box 7. In the M07 cold box 7, the mixed refrigerant liquefies the natural gas entering the box through a throttling valve and a stepped cooling process. The liquefied natural gas exiting the M07 cold box 7 is then throttled to approximately 0.2 MPa and -161°C, becoming the LNG product. The manifold skid 10 provides refrigerant to the M04 pre-cooling compressor skid 4 and the M05 main refrigeration compressor skid 5.

Claims

1. A spatial arrangement of a natural gas liquefaction system, comprising: The natural gas purification section and the natural gas liquefaction section behind the natural gas purification section, the natural gas purification section comprising: M01 natural gas dehydration sled, M02 natural gas deacidification sled, M03 natural gas deacidification tower sled, amine buffer tank, fuel gas tank, regenerator overhead cooler, lean amine liquid cooler and regenerator gas cooler; the natural gas liquefaction section comprising: M04 pre-cooling compressor sled, M05 main cold compressor sled, M06 evaporator sled, M07 cold box, EAG heater, busbar sled and pre-cooling compressor air cooler; characterized in that: M01 natural gas dehydration sled, M02 natural gas deacidification sled, M03 natural gas deacidification tower sled are arranged side by side in the front of the natural gas purification section; M03 natural gas deacidification tower sled is followed by amine buffer tank and fuel gas tank in turn; regenerator overhead cooler and lean amine liquid cooler are located on the upper layer of M02 natural gas deacidification sled and arranged from front to back in turn; regenerator gas cooler is located on the upper layer of M01 natural gas dehydration sled at the rear position; M04 pre-cooling compressor sled, M05 main cold compressor sled, M06 evaporator sled are arranged side by side in the front of the natural gas liquefaction section, and M06 evaporator sled is followed by M07 cold box and busbar sled in turn; EAG heater is located behind M04 pre-cooling compressor sled; pre-cooling compressor air cooler is located on the upper layer of M04 pre-cooling compressor sled, M05 main cold compressor sled and M06 evaporator sled; in addition, M01 natural gas dehydration sled, M02 natural gas deacidification sled, M03 natural gas deacidification tower sled, M04 pre-cooling compressor sled, M05 main cold compressor sled and M06 evaporator sled are connected into one by steel structure.

2. The spatial arrangement of a natural gas liquefaction system according to claim 1, characterized in that: The natural gas purification section and the natural gas liquefaction section are directly connected through a pipe gallery, which is used for connecting the pipelines, instrument cable trough boxes and electrical cable trough boxes of the natural gas purification section and the natural gas liquefaction section.

3. The spatial arrangement of a natural gas liquefaction system according to claim 2, characterized in that: The pipe gallery is arranged in two layers, the lower layer is arranged with process pipelines, and the upper layer is arranged with instrument cable trough boxes and electrical cable trough boxes; the pipe gallery on the natural gas purification section is rooted in M01 natural gas dehydration sled and M02 natural gas deacidification sled, and the pipe gallery on the natural gas liquefaction section is rooted in M04 pre-cooling compressor sled and M06 evaporator sled, and the steel structure frame of the sled is used as the support of the pipe gallery.

4. The spatial arrangement of a natural gas liquefaction system according to claim 2, characterized in that: The lower part of the pipe gallery is a patrol channel, and the width of the pipe gallery is not less than 1.5 meters and the height is not less than 2 meters under the premise of meeting the arrangement of process pipelines, instrument cable trough boxes and electrical cable trough boxes between devices, so as to meet the personnel passage.

5. The spatial arrangement of a natural gas liquefaction system according to claim 2, characterized in that: The pipeline interfaces for connecting the pipe gallery in each sled are all towards the pipe gallery, which is convenient for the direct connection of each sled through the pipe gallery.

6. The spatial arrangement of a natural gas liquid system according to claim 1 or 2 or 3 or 4 or 5, characterized in that: M04 pre-cooling compressor sled, M05 main cold compressor sled and M06 evaporator sled are all designed with steel structure frames, the three steel structure frames are connected into one through steel structure and are at the same height, and are used for supporting the pre-cooling compressor air cooler.

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