Liquefied Natural Gas Compression System

Abstract

To provide a liquefied natural gas compression system capable of minimizing a carbon dioxide emission amount.SOLUTION: A liquefied natural gas compression system includes: a first gas turbine that drives a rotary machine; a first steam boiler including a first heat recovery steam generator that recovers heat from exhaust gas from the first gas turbine; a first steam turbine that drives a first refrigerant compressor; a common header steam line through which steam from the first steam boiler flows to an inlet of the first steam turbine; an auxiliary steam line; and a letdown valve that connects the common header steam line to the auxiliary steam line and that opens in response to pressure of the common header steam line exceeding a predetermined threshold value.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a liquefied natural gas compression system. This application claims priority to U.S. Patent Application No. 16 / 906,831, filed in the United States on June 19, 2020, the contents of which are incorporated herein by reference. [Background technology]

[0002] Liquefied natural gas (LNG) is natural gas that has been cooled to a liquid state. Converting natural gas to a liquid requires compressing the natural gas and then cooling the compressed natural gas. Gas turbines are typically used to provide the power to perform these processes.

[0003] In conventional LNG plant designs, exhaust gases from the gas turbine are vented to the atmosphere through the exhaust stack. Some of these designs use a heat recovery system at the gas turbine exhaust where heat is transferred to a system to produce hot oil or steam. The heat recovery system is known as a Waste Heat Recovery System (WHRU) to produce hot oil for the process, or a Heat Recovery Steam Generator (HRSG) to produce steam. In either case, these systems improve the overall thermal efficiency and reduce CO, CO2, and NOx emissions. X Emissions of pollutants from the gas turbine, including refrigeration, are minimized. In a conventional LNG plant, steam from the HRSG can be used as an energy source and is supplied to a steam turbine to drive rotating machinery such as compressors other than the refrigeration compressor, generators, pumps, etc. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] U.S. Pat. No. 10,126,048 [Patent Document 2] US Patent Application Publication No. 2012 / 0324861 [Patent Document 3] Patent No. 5241719 [Patent Document 4] Patent No. 5976951 Summary of the Invention [Problem to be solved by the invention]

[0005] The present invention provides a liquefied natural gas compression system that can minimize carbon dioxide emissions. [Means for solving the problem]

[0006] In one or more embodiments of the present invention, the carbon dioxide emissions from the LNG compression system are minimized by effectively combining the Brayton cycle and the Rankine thermal cycle while minimizing the equipment required. In one or more embodiments, other heat transfer media such as residual steam or hot oil systems may be used to further improve thermal efficiency, thereby further reducing the carbon dioxide emissions from the liquefaction process and associated plant auxiliaries.

[0007] In one or more embodiments, a gas turbine is mechanically coupled to a refrigeration compressor, and a steam turbine is mechanically coupled to the same refrigeration compressor and is powered by exhaust energy from the gas turbine.

[0008] In accordance with one or more embodiments, the use of a steam turbine as the refrigeration power source can significantly reduce the amount of fuel required by the system, thereby reducing carbon dioxide emissions, which is further independent of the liquid refrigeration process being used.

[0009] Additionally, one or more embodiments may advantageously use steam generated in a HRSG (located at the exhaust of the gas turbine driving the refrigeration compressor) as the primary steam source for an additional refrigeration compressor and associated steam turbine, which may provide the following advantages: - Maximizing the overall efficiency of LNG plants Minimizing the number of gas turbines powering the LNG plant and the pollutant emissions from those gas turbines -Reduction in equipment installation space Decrease in capital investment Maintenance of cryogenic temperatures in the event of abnormal conditions using a common steam system

[0010] In accordance with one or more embodiments of the present invention, a liquefied natural gas compression system includes: a first gas turbine driving a rotary machine; a first steam boiler including a first heat recovery steam generator configured to recover heat from exhaust gas from the first gas turbine; a first steam turbine driving a first refrigeration compressor; a common header steam path through which steam from the first steam boiler flows to an inlet of the first steam turbine; Auxiliary steam paths; a letdown valve connecting the common header steam path and the auxiliary steam path and opening in response to pressure in the common header steam path exceeding a predetermined threshold; Equipped with.

[0011] One or more embodiments of the liquefied natural gas compression system further include a check valve connecting the common header vapor path and the auxiliary vapor path in parallel with the drop valve.

[0012] In one or more embodiments of the liquefied natural gas compression system, the check valve opens in response to pressure in the auxiliary vapor path exceeding pressure in the common header vapor path.

[0013] In one or more embodiments of the liquefied natural gas compression system, the drop valve opens in response to pressure in the auxiliary vapor path exceeding pressure in the common header vapor path to allow vapor to flow from the auxiliary vapor path to the common header vapor path.

[0014] In one or more embodiments of the liquefied natural gas compression system, the rotary machine includes a second refrigeration compressor.

[0015] According to one or more embodiments, a liquefied natural gas compression system includes: a second gas turbine driving a second refrigeration compressor; a second steam boiler including a second heat recovery steam generator configured to recover heat from exhaust gases from the second gas turbine; It further comprises: The common header steam path is connected to a steam outlet of the second steam boiler.

[0016] In one or more embodiments, the liquefied natural gas compression system further comprises a second gas turbine driving a second refrigeration compressor, and the first heat recovery steam generator recovers heat from an exhaust gas of the second gas turbine.

[0017] According to one or more embodiments of the liquefied natural gas compression system, the liquefied natural gas compression system further comprises a second steam turbine driving a second refrigeration compressor, the common header steam path being connected to an inlet of the second steam turbine.

[0018] In one or more embodiments of the liquefied natural gas compression system, at least one of either the first refrigeration compressor or the second refrigeration compressor includes a barrel-type compressor unit.

[0019] In one or more embodiments of the liquefied natural gas compression system, the first heat recovery steam generator includes a furnace. Effect of the Invention

[0020] Other aspects and advantages of the present invention will become apparent from the following description and the appended claims. [Brief description of the drawings]

[0021] [Figure 1] FIG. 1 is a schematic diagram illustrating a liquefied natural gas compression system according to one or more embodiments of the present invention. [Diagram 2] FIG. 2 is another schematic diagram of a liquefied natural gas compression system according to one or more embodiments of the present invention, illustrating how multiple gas turbines are used in conjunction with multiple boilers. [Diagram 3] FIG. 2 is another schematic diagram of a liquefied natural gas compression system according to one or more embodiments of the present invention, illustrating how multiple gas turbines are used in conjunction with a boiler. [Figure 4] FIG. 2 is another schematic diagram of a liquefied natural gas compression system in accordance with one or more embodiments of the present invention, illustrating how multiple steam turbines are used. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] Specific embodiments are described in detail below with reference to the accompanying drawings.

[0023] In the following detailed description of the embodiments of the present disclosure, many specific details are described to facilitate a better understanding of the present disclosure. However, it is clear to those skilled in the art that the present disclosure can be practiced without these specific details. In other instances, well-known features are not described in detail to avoid unnecessarily complicating the description. For example, similar or identical elements in various embodiments are given the same reference numerals, and redundant descriptions are omitted.

[0024] Throughout this application, ordinal numbers (e.g., first, second, third, etc.) may be used as adjectives of elements (i.e., any noun in this application). The use of ordinal numbers does not imply or constrain a particular order of elements or any element to be a single element, unless expressly disclosed by the use of "preceding," "after," "single," or other terms. Rather, the use of ordinal numbers is to distinguish elements. For example, a first element is distinct from a second element, a first element includes one or more elements, and follows (or precedes) a second element in the ordering of elements.

[0025] It should be understood that singular references, including "said," include plural referents unless expressly stated otherwise. Thus, for example, a reference to "a horizontal beam" includes a reference to one or more such beams.

[0026] Terms such as "approximately" and "substantially" mean that the referred characteristics, parameters, or values ​​need not be achieved precisely, and that deviations and variations, including tolerances, measurement errors, limits of measurement accuracy, or other factors known to those skilled in the art, may occur without losing the intended effect of the characteristics.

[0027] Although multiple dependent claims have not been introduced, it will be clear to a person skilled in the art that the subject matter of a dependent claim in one or more embodiments may be combined with other dependent claims.

[0028] FIG. 1 shows a schematic diagram of a liquefied natural gas compression system 10 according to one or more embodiments of the present invention. In this example, a gas turbine 100 (an example of a first gas turbine) of the liquefied natural gas compression system 10 converts thermal energy of a working gas into rotational energy to drive a rotating machine (load) 102. The rotating machine 102 is, for example, a refrigeration compressor used to liquefy natural gas or a generator that generates electricity. Although not shown, two or more rotating machines 102 may be driven by the gas turbine 100. When the gas turbine 100 drives two or more rotating machines 102, the gas turbine 100 and the two or more rotating machines 102 may have rotating shafts connected in series (same axis). Alternatively, the driving power of the gas turbine 100 may be transmitted to one or more rotating machines 102 by a power transmission mechanism such as gears.

[0029] Continuing with the example shown in Figure 1, exhaust gas from the gas turbine 100 is provided to a boiler 200 (an example of a "first steam boiler"). In the boiler 200, a heat recovery steam generator (HRSG) 202 (an example of a "first heat recovery steam generator") recovers thermal energy (heat) from the exhaust gas to generate steam. The boiler 200 may include a furnace 204, such as an internal burner, that adds heat to the steam.

[0030] The boiler 200 outputs steam to a steam turbine 400 (an example of a "first steam turbine") via a common header steam path 300. The steam turbine 400 converts thermal energy of the steam into rotational energy to drive a rotary machine (load) 402. The rotary machine 402 is, for example, a refrigeration compressor (an example of a "first refrigeration compressor") used to liquefy natural gas, or a generator that generates electricity. Although not shown, two or more rotary machines 402 may be driven by the steam turbine 400. When the steam turbine 400 drives two or more rotary machines 402, the steam turbine 400 and the two or more rotary machines 402 may have rotating shafts connected in series (same axis). Alternatively, the driving power of the steam turbine 400 may be transmitted to one or more rotary machines 402 by a power transmission mechanism such as gears.

[0031] The steam turbine 400 can be started after the gas turbine 100 is running and steam is produced by the HRSG 202. If the rotating machine (load) 402 must run before the rotating machine (load) 102, the gas turbine 100 can be started to divert the rotating machine (load) 102 from the supply line. For example, if the rotating machine 102 is a compressor, the rotating machine 102 can be placed in recycle operation. After the steam turbine 400 is started and the rotating machine (load) 402 is placed in the supply line, the rotating machine 102 is returned to the supply line.

[0032] When the rotary machine 102 is a compressor, the compressor includes a compressor body, an intake path for supplying gas to the compressor body, and an exhaust path for discharging gas from the compressor body. The compressor also includes a bypass path connected to the intake path and the exhaust path so that gas circulates from the exhaust path to the intake path. An anti-surge valve is disposed in the bypass path. When the compressor is in an operating state, the anti-surge valve is closed. When the compressor is in a recycle operation state, the anti-surge valve is opened, and the gas discharged from the compressor body circulates to the intake path through the bypass path.

[0033] The steam outlet of the steam turbine 400 may be connected to a steam condensation system (condenser) 500. When the steam turbine 400 is connected to the steam condensation system 500, water recovered from the steam by the steam condensation system 500 is circulated to the boiler 200 as liquid water to be reused in the boiler 200.

[0034] The steam turbine 400 may have a steam extraction port. Steam extracted from the steam turbine 400 is directed to an auxiliary steam path 700 and supplied to steam-using equipment 720 connected to the auxiliary steam path 700. By providing a check valve 404, steam can be extracted only when the steam at the extraction port has a pressure higher than the pressure of the auxiliary steam path 700 or a predetermined threshold value.

[0035] 1 , auxiliary steam source 710 is connected to auxiliary steam path 700 and is used to provide steam when steam is not extracted from steam turbine 400. In other words, auxiliary steam source 710 and steam using equipment 720, which are connected to each other by auxiliary steam path 700, may constitute separate steam using systems. In this manner, liquefied natural gas compression system 10 according to one or more embodiments of the present invention may include a modified version of a conventional steam system.

[0036] In the example shown in FIG. 1 , the common header steam path 300 is also connected to the auxiliary steam path 700 via a drop valve 600 that regulates the pressure of the common header steam path 300. The drop valve 600 opens when the pressure of the common header steam path 300 exceeds a predetermined threshold, allowing excess steam within the common header steam path 300 to be released to the auxiliary steam path 700. This allows the common header steam path 300 and other elements connected to the common header steam path 300 to be protected from excess steam. Furthermore, by connecting the drop valve 600 to the auxiliary steam path 700, the energy of the excess steam within the common header steam path 300 can be used more efficiently compared to a configuration in which the excess steam is simply dissipated to the atmosphere.

[0037] Further, in the example shown in FIG. 1, an additional steam source 800 is connected to the common header steam path 300. With this configuration, the steam turbine 400 can operate even if the boiler 200 with the HRSG 202 is not operating. When the HRSG 202 is not operating, the gas turbine 100 can maintain operation by bypassing the HRSG 202. A check valve 610 is selectively provided between the common header steam path 300 and the auxiliary steam path 700 in parallel with the drop valve 600. The check valve 610 opens when the pressure of the common header steam path 300 is lower than the pressure of the auxiliary steam path 700. By opening the check valve 610, the steam in the auxiliary steam path 700 can flow into the common header steam path 300, and the steam turbine 400 can operate even when the boiler 200 with the HRSG 202 is not operating. Instead of using a check valve 610 , the drop valve 600 may be controlled to open when the common header steam path 300 is at a lower pressure than the auxiliary steam path 700 .

[0038] FIG. 2 shows a schematic diagram of a liquefied natural gas compression system 20 according to one or more embodiments of the present invention. Compared to the liquefied natural gas compression system 10 shown in FIG. 1, the liquefied natural gas compression system 20 has an additional gas turbine 110 (an example of a "second gas turbine"), a boiler 210 (an example of a "second steam boiler") with a HRSG 212 (an example of a "second heat recovery steam generator"), and an optional additional heater 214. When the HRSG 202 and / or the HRSG 212 are not operating, the dedicated gas turbine 100 and / or the gas turbine 110 may maintain operation by bypassing these HRSGs. The gas turbine 110 converts the thermal energy of the working gas into rotational energy to drive a rotating machine (load) 112. The rotating machine 112 may be, for example, a refrigeration compressor (an example of a "second refrigeration compressor") used to liquefy natural gas, or a generator to generate electricity. Similar to the rotary machine 102, two or more rotary machines 112 may be driven by a gas turbine 110, either connected by serially connected (same axis) rotating shafts or transmitted by a power transmission mechanism such as gears.

[0039] The steam turbine 400 may be started after the gas turbine 100 and / or the gas turbine 110 are operating and steam is generated in the HRSG 202 and / or the HRSG 212. If the rotating machine (load) 402 must operate before the rotating machine (load) 102 and / or the rotating machine (load) 112, the gas turbine 100 and / or the gas turbine 110 may be started to bypass the rotating machine (load) 102 and / or the rotating machine (load) 112 from the supply system. For example, if the rotating machine 102 is a compressor, the rotating machine 102 is placed in recycle operation. After the steam turbine 400 is started and the rotating machine (load) 402 is placed in the supply system, the rotating machine 102 and / or the rotating machine 112 is returned to the supply system.

[0040] In the example shown in FIG. 2, exhaust gas from the gas turbine 110 is supplied to a boiler 210 , and steam output from the boiler 210 is guided to a common header steam path 300 and used to drive a steam turbine 400 .

[0041] Other elements of the liquefied natural gas compression system 20 shown in FIG. 2 are similar or identical to those of the liquefied natural gas compression system 10.

[0042] FIG. 3 shows a schematic diagram of a liquefied natural gas compression system 30 according to one or more embodiments of the present invention. Compared with the liquefied natural gas compression system 20 shown in FIG. 2, the liquefied natural gas compression system 30 has only one boiler 200 connected to the gas turbine 100 and the gas turbine 110. As shown in FIG. 3, the exhaust gas from the gas turbine 110 is mixed with the exhaust gas of the gas turbine 100 before entering the boiler 200. In this case, only one HRSG 202 may be used in the boiler 200. Furthermore, the boiler 200 may have only one optional additional heating furnace 204. When the HRSG 202 is not working, the gas turbine 100 and the gas turbine 110 can maintain operation by bypassing the HRSG.

[0043] Alternatively, the exhaust gas from the gas turbine 110 may be directed to the boiler 200 separately from the exhaust gas from the gas turbine 100. In this case, the boiler 200 may have two independent HRSGs (not shown) therein, and each HRSG may generate steam using the exhaust gas from the corresponding gas turbine. The boiler 200 may have two independent heaters (not shown) for each HRSG, or may have one heater (such as heater 204) shared by the two HRSGs.

[0044] The steam turbine 400 may be started after the gas turbine 100 and / or the gas turbine 110 are operating and steam is generated in the HRSG 202. If the rotating machine (load) 402 must operate before the rotating machine (load) 102 and / or the rotating machine (load) 112, the gas turbine 100 and / or the gas turbine 110 may be started to divert the rotating machine (load) 102 and / or the rotating machine (load) 112 from the supply system. For example, if the rotating machine 102 is a compressor, the rotating machine 102 is placed in recycle operation. After the steam turbine 400 is started and the rotating machine (load) 402 is placed in the supply system, the rotating machine 102 and / or the rotating machine 112 is returned to the supply system.

[0045] Other elements of the liquefied natural gas compression system 30 shown in FIG. 3 are similar or identical to those of the liquefied natural gas compression system 20.

[0046] FIG. 4 shows a schematic diagram of a liquefied natural gas compression system 40 according to one or more embodiments of the present invention. Compared to the liquefied natural gas compression system 10 shown in FIG. 1, the liquefied natural gas compression system 40 has an additional steam turbine 410 (an example of a "second steam turbine") connected to the common header steam path 300. The steam turbine 410 converts thermal energy of the steam from the common header steam path 300 into rotational energy to drive a rotating machine (load) 412. When the HRSG 202 is not operating, the gas turbine 100 can maintain operation by bypassing the HRSG. The rotating machine 412 may be, for example, a refrigeration compressor used to liquefy natural gas (another example of a "second refrigeration compressor") or a generator that generates electricity. Two or more rotating machines 412 may be driven by the steam turbine 410 connected by rotating shafts connected in series (same axis) or transmitted by a power transmission mechanism such as gears.

[0047] The steam turbine 400 and the steam turbine 410 may be started after the gas turbine 100 is running and the steam is generated in the HRSG 202. If the rotating machine (load) 402 and / or the rotating machine (load) 412 must run before the rotating machine (load) 102, the gas turbine 100 may be started to divert the rotating machine (load) 102 from the supply system. For example, if the rotating machine 102 is a compressor, the rotating machine 102 is placed in recycle operation. After the steam turbine 400 and / or the steam turbine 410 are started and the rotating machine (load) 402 and / or the rotating machine (load) 412 are placed in the supply system, the rotating machine 102 is returned to the supply system.

[0048] 4, no steam is extracted from steam turbine 410. In other words, all of the steam channeled to steam turbine 410 is used to drive rotary machine 412. However, similar to steam turbine 400, a portion of the steam may be extracted from steam turbine 410 and routed to auxiliary steam path 700.

[0049] One or more embodiments of the invention may have one or more of the following advantages.

[0050] In one or more embodiments of the present invention, carbon dioxide emissions from an LNG refrigeration and compression system are minimized by effectively combining the Brayton and Rankine thermal cycles while minimizing the equipment required. In one or more embodiments, residual steam and other heat transfer media, such as hot oil systems, are permitted to be used to improve thermal efficiency, thereby further reducing carbon dioxide emissions from the liquefaction process and associated plant auxiliaries.

[0051] For example, one or more embodiments allow residual thermal energy in the exhaust gas of one or more gas turbines 100, 110 to be utilized as steam output for the boiler 200, 210 with the HRSG 202, 212, rather than being dissipated into the atmosphere with the exhaust gas. The energy recovered from the exhaust gas and the resulting steam may then be used to operate the steam turbine 400, 410 or provided to an auxiliary system via the auxiliary steam path 700. Furthermore, one or more embodiments reduce the total thermal energy dissipated into the atmosphere with the exhaust gas of the gas turbine 100, 110. As a result, for the same energy output from the entire system, the liquefied natural gas compression system 10, 20, 30, and 40 according to one or more embodiments may reduce the total number of gas turbines 100, 110 used in the system.

[0052] In one or more embodiments, a gas turbine is mechanically coupled to a refrigeration compressor. A steam turbine is mechanically coupled to the same refrigeration compressor and is powered by the exhaust energy of the gas turbine. By using a steam turbine as the refrigeration power source, the amount of fuel burned in the system can be significantly reduced, thereby reducing carbon dioxide emissions. Furthermore, this reduced carbon dioxide emissions is independent of the liquid refrigeration process being used.

[0053] One or more embodiments may reduce overall system costs because gas turbines are expensive relative to other sources of rotational energy, such as steam turbines. Additionally, one or more embodiments may reduce facility footprints because the footprint of a steam turbine is smaller than the footprint of a gas turbine. Additionally, because there are fewer gas turbines, one or more embodiments may reduce fuel consumption for the gas turbines, thereby reducing potential air pollution and carbon dioxide emissions from the system.

[0054] In one or more embodiments of the liquefied natural gas compression system 10, 20, 30, and 40, two or more turbines (gas turbines 100, 110 and steam turbines 400, 410) can be used as the rotational energy source to drive the rotary machines 102, 112, 402, and 412. In general, steam turbines can have longer intervals between maintenance operations compared to gas turbines. Therefore, compared to configurations where only gas turbines are used, scheduling maintenance operations for all turbines is easier and more flexible, and at least one turbine can remain in operation even if the other turbines are undergoing maintenance operations. Furthermore, when refrigeration compressors are used as the rotary machines 102, 112, 402, and 412, scheduling maintenance of these turbines allows at least one refrigeration compressor to remain in operation and produce LNG without interruption. This continuous production of LNG can reduce the amount of LNG storage in the production plant. Furthermore, the cryogenic state of the refrigeration system can be continuously maintained, and the procedure of restarting the combined turbine and refrigeration compressor after maintenance operations can be reduced.

[0055] Furthermore, by having multiple turbines, one or more embodiments may provide increased design flexibility for different types of compressors. For example, barrel compressor units may be used to compress natural gas due to their high discharge pressure. However, when performing maintenance on the barrel compressor units, the rotor assembly (or bundle) is pulled out of the casing in the direction of the rotor assembly's central axis. Thus, when two or more rotating machines are directly driven by the turbines, the barrel compressor units may only be installed at the end of the drive shaft. The use of combined cycle mechanisms may alleviate this limitation in using the barrel compressor units by driving them around a different axis than the turbines. Furthermore, one or more embodiments with multiple turbines (gas and / or steam turbines) may allow many barrel compressor units to be installed while still providing space around them for maintenance.

[0056] While the present disclosure has been described with respect to only a limited number of embodiments, those skilled in the art having the benefit of this disclosure will appreciate that various other embodiments may be devised without departing from the spirit of the present invention. Accordingly, the present invention is limited only by the scope of the appended claims. [Explanation of symbols]

[0057] 10,20,30 LNG Compression System 102, 112, 412 Rotating Machinery 100 Gas Turbine 110 Additional Gas Turbine 204 Heating Furnace 200,210 Boiler 202,212 Heat recovery steam generator (HRSG) 300 Common Header Steam Route 410 Additional Steam Turbine 500 Steam Condensing System 600 Lowering valve 610 Check valve 700 Auxiliary Steam Path 710 Auxiliary steam source 720 Steam-using equipment 800 additional steam sources

Claims

1. a first gas turbine driving a rotary machine; a first steam boiler including a first heat recovery steam generator configured to recover heat from exhaust gas from the first gas turbine; a first steam turbine driving a first refrigeration compressor; a common header steam path through which steam from the first steam boiler flows to an inlet of the first steam turbine; an auxiliary steam path; a letdown valve connecting the common header steam path and the auxiliary steam path and opening in response to a pressure in the common header steam path exceeding a predetermined threshold; Equipped with a check valve connecting the common header steam path and the auxiliary steam path in parallel with the drop valve. Liquefied natural gas compression systems.

2. A liquefied natural gas compression system as described in claim 1, the check valve opens in response to a pressure in the auxiliary steam path exceeding a pressure in the common header steam path. Liquefied natural gas compression systems.

3. 2. The liquefied natural gas compression system of claim 1, In response to pressure in the auxiliary steam path exceeding pressure in the common header steam path, the drop valve opens to allow steam from the auxiliary steam path to flow to the common header steam path. Liquefied natural gas compression systems.

4. 2. The liquefied natural gas compression system of claim 1, The rotary machine includes a second refrigeration compressor. Liquefied natural gas compression systems.

5. The liquefied natural gas compression system of claim 4, At least one of the first refrigeration compressor or the second refrigeration compressor includes a barrel-type compressor unit. Liquefied natural gas compression systems.

6. 2. The liquefied natural gas compression system of claim 1, a second gas turbine driving a second refrigeration compressor; and a second steam boiler including a second heat recovery steam generator configured to recover heat of exhaust gas from the second gas turbine; Further comprising: The common header steam path is connected to a steam outlet of the second steam boiler. Liquefied natural gas compression systems.

7. The liquefied natural gas compression system of claim 6, At least one of the first refrigeration compressor or the second refrigeration compressor includes a barrel type compressor unit. Liquefied natural gas compression systems.

8. 2. The liquefied natural gas compression system of claim 1, a second gas turbine driving a second refrigeration compressor; the first heat recovery steam generator recovers heat from exhaust gases from the second gas turbine; Liquefied natural gas compression systems.

9. The liquefied natural gas compression system of claim 8, At least one of the first refrigeration compressor or the second refrigeration compressor includes a barrel type compressor unit. Liquefied natural gas compression systems.

10. 2. The liquefied natural gas compression system of claim 1, a second steam turbine driving a second refrigeration compressor; the common header steam path is connected to an inlet of the second steam turbine. Liquefied natural gas compression systems.

11. The liquefied natural gas compression system of claim 10, At least one of the first refrigeration compressor or the second refrigeration compressor includes a barrel type compressor unit. Liquefied natural gas compression systems.

12. 2. The liquefied natural gas compression system of claim 1, the first heat recovery steam generator includes a heater; Liquefied natural gas compression systems.

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