JP7189962B2 - gas supply assembly - Google Patents

Description

The present invention relates to a gas supply assembly according to the preamble of claim 1.

Liquefied gas propulsion systems, such as LNG (liquefied natural gas) carriers, are typically powered by the gas of the cargo. The storage of gas on tankers is carried out using insulated cargo tanks which are formed with ullage space compartments and liquid phase compartments. The pressure in the cargo tank is approximately at the level of atmospheric pressure and the temperature of the liquefied gas is approximately -163°C. Although the cargo tanks are very well insulated, so-called natural boil-off gases form when the temperature of the liquefied gas gradually increases. Boil-off gas must be removed from the tank to avoid a large increase in pressure within the cargo tank. The reason is that cargo tanks are very sensitive to changes in pressure. The boil-off gas may be utilized by the ship's gas consumers, such as the propulsion system. However, the amount of natural boil-off gas is insufficient to supply all the required propulsion energy in all situations, so ships get an extra gas, the so-called forced boil-off gas. shall be provided with additional means for

WO 2005/010002 shows a gas supply apparatus in which natural boil-off gas is led to a cryogenic compressor, which compresses the gas before supplying it through a supply line for consumption. Increase pressure. Additionally, the apparatus includes a forced boiling vaporizer in which liquid gas previously raised to a higher pressure is vaporized. In this configuration, the forced boiling gas portion is combined with the natural boil-off gas after the pressure of the natural boil-off gas is increased.

WO 2005/010011 discloses an apparatus for supplying natural gas fuel to heat the boiler of an ocean-going tanker for the transport of LNG. The apparatus includes a forced LNG vaporizer having an inlet communicating with a liquid storage area of said tank and an outlet communicating with a conduit leading to a fuel burner associated with the boiler. The apparatus also includes an inlet communicating with the ullage space of the at least one LNG storage tank and an outlet communicating with a conduit leading from the compressor to a fuel burner associated with the boiler. The operation of the compressor increases the pressure of the gas. Compressors are technically required to maintain very severe cryogenic temperatures.

EP-A-1348620 EP-A-1291576

SUMMARY OF THE INVENTION It is an object of the present invention to provide a gas supply assembly configuration with significantly improved performance compared to prior art solutions.

The objects of the invention can be substantially realized in the manner disclosed in the independent claims and other claims describing different embodiments of the invention in more detail.

According to one embodiment of the invention, the gas supply assembly includes a tank, the tank configured to store a liquefied gas therein so as to have a vapor phase compartment and a liquid phase compartment, the assembly comprising: a first gas supply line configured to deliver gas from a liquid phase compartment of the tank to one or more gas consumers; and a first gas supply line configured to deliver gas from the gas phase compartment of the tank to one or more gas consumers. and a second gas supply line configured to: the second gas supply line including a second heat exchanger configured to heat the gas in the second gas supply line , the first gas supply line includes a first heat exchanger configured to vaporize a liquefied gas in the first gas supply line, and the second gas supply line further comprising a compressor configured to increase the pressure of gas in the gas supply line of the compressor, the compressor comprising a third heat exchanger. The assembly includes a heat transfer circuit to which the first heat exchanger, the second heat exchanger and the third heat exchanger are connected, the heat transfer circuit being connected to the heat transfer circuit within the heat transfer circuit. a fourth heat exchanger configured to transfer heat to a heat medium; and pumping means configured to circulate the heat transfer medium within the heat transfer circuit; and said third heat exchanger are arranged in series with each other and said first heat exchanger is arranged in parallel with said second heat exchanger and said third heat exchanger.

This allows both the natural boil-off gas in the second gas supply line and the forced boil-off gas in the first gas supply line to be gas consumables using a single heat source and a simple shared heat transfer medium circuit. prepared to be supplied to

According to one embodiment of the invention, the third heat exchanger is configured to receive heat from the compressor and control the temperature of the compressor.

According to one embodiment of the invention, the gas supply assembly includes a tank, the tank configured to store a liquefied gas therein so as to have a vapor phase compartment and a liquid phase compartment, the assembly comprising: a first gas supply line configured to deliver gas from a liquid phase compartment of the tank to one or more gas consumers; and a first gas supply line configured to deliver gas from the gas phase compartment of the tank to one or more gas consumers. and a second gas supply line configured to: the second gas supply line including a second heat exchanger configured to heat the gas in the second gas supply line , the second gas supply line includes a compressor configured to increase the pressure of gas in the first gas supply line, the compressor comprising compressor cooling means. The assembly includes a second temperature probe located in the second gas supply line downstream of the compressor, the power of the compressor cooling means being controllable based on the temperature of the boil-off gas at a location downstream of the compressor. is.

According to one embodiment of the invention, the assembly includes a second temperature probe arranged in the second gas supply line downstream of the compressor, the heat transfer power of the third heat exchanger being controllable based on the temperature of the boil-off gas at a location downstream of the This provides an effective and direct method for controlling the temperature of the boil-off gas exiting the second gas supply line.

According to one embodiment of the invention, the heat transfer circuit includes two branches, the circuit extending from a first branch point to a second branch point and an auxiliary circuit section extending from the first branch point to a second branch point. a main circuit section extending to a point, the second heat exchanger and the third heat exchanger being arranged in the auxiliary circuit section between the two branch points, the first heat exchanger being between the two branch points; placed in the main circuit section between

According to one embodiment of the invention, the auxiliary circuitry includes a first valve for controlling the portion of the heat transfer medium passing through the auxiliary circuitry.

According to one embodiment of the invention, the first branch point is upstream of the first heat exchanger and the second branch point is downstream of the first heat exchanger.

This provides the effect of effectively controlling the overall heat transfer within the assembly.

According to one embodiment of the present invention, the assembly includes a first temperature probe arranged in the auxiliary heat transfer circuit between the second heat exchanger and the third heat exchanger, and in the auxiliary circuit section A first valve of is controlled based on a first temperature probe.

According to one embodiment of the invention, the compressor includes an oil circuit configured to pass through a third heat exchanger to cool oil in the oil circuit.

According to one embodiment of the invention, the third heat exchanger for cooling the compressor comprises a bypass conduit and a valve, wherein the heat transfer medium flow through the third heat exchanger and the transfer through the bypass conduit. Controlling the flow rate of the heat transfer medium, the assembly includes a second temperature probe positioned in the second gas supply line downstream of the compressor, the valve controlling the rate of boil-off gas at a location downstream of the compressor. It is configured to control the flow of heat transfer medium through the third heat exchanger and the flow of heat transfer medium through the bypass conduit based on the temperature.

According to one embodiment of the invention, the compressor includes an oil circuit configured to pass through a third heat exchanger for cooling oil in the circuit; Heat exchanger number 3 includes a bypass conduit and a three-way valve which regulates the proportion of heat transfer medium flow through the third heat exchanger and heat transfer medium flow through the bypass conduit to the amount of oil in the oil circuit. Control based on temperature.

According to one embodiment of the invention, the second branch point of the heat transfer circuit is downstream of the first heat exchanger and the fourth heat exchanger. That is, the second branch point is between the outlet of the fourth heat exchanger and the inlet of the first heat exchanger.

According to one embodiment of the invention, the second branch point of the heat transfer circuit is downstream of the first heat exchanger and upstream of the fourth heat exchanger. That is, the second branch point is between the outlet of the first heat exchanger and the inlet of the fourth heat exchanger.

According to one embodiment of the invention, the assembly includes a fourth heat exchanger and a third temperature probe arranged in the heat transfer circuit downstream of the second branch point, Power is configured to be controlled using a third temperature probe.

The present invention is adapted to store liquefied gas at cryogenic temperatures and at substantially atmospheric pressure, at least at pressures too low to use the gas as a gas consumer without raising the pressure of the gas outside the storage tank. It relates to gas utilization arrangements associated with liquefied gas storage tanks.

The invention also allows the assembly to be combined into a single assembly, which is advantageous for its assembly and installation on a marine vessel.

The exemplary embodiments of the invention presented in this patent application should not be construed as limiting the applicability of the appended claims. In the present patent application, the verb "include" is used as an open limitation that does not exclude the presence of undescribed features. The features recited in the dependent claims are freely combinable with each other, unless explicitly stated otherwise. The novel features believed characteristic of the invention are set forth with particularity in the appended claims.

The invention will now be described with reference to the accompanying exemplary schematic drawings.
FIG. 1 shows a gas supply assembly according to one embodiment of the invention. FIG. 2 shows a gas supply assembly according to another embodiment of the invention.

FIG. 1 schematically shows a gas supply assembly 10. As shown in FIG. Gas supply assembly 10 is configured to supply gas fuel to one or more gas consumers 14 connected to gas supply assembly 10 . The gas supply assembly includes one or more tanks 12, only one of which is shown. Tank 12 is configured to store liquefied gas within tank 12 such that tank 12 has a vapor phase compartment 12.1 and a liquid phase compartment 12.2. Because the tank is constructed to maintain substantially atmospheric pressure and the cryogenic temperature of the liquefied gas, which is approximately -163°C, the gas remains primarily in the liquid phase. Since the tank is substantially at atmospheric pressure, the gas supply system must be equipped with means to increase the gas pressure to the level required by the connected gas consumer. The gas supply assembly is particularly advantageous for use on marine vessels such that the gas is used as fuel for internal combustion engines on board the vessel. The tank may be a cargo tank or a dedicated fuel reservoir for gas consumption on board the ship. If the gas consumer is a gas-operated internal combustion four-stroke piston engine (hereafter referred to as a gas engine), the absolute pressure of the fuel is typically between 400 and 800 kPa at the gas supply to the engine. Of course, the actual pressure of the fuel depends on the demand of gas consumers and can be 1400-1600 kPa.

Liquefied gas is available to the gas engine 14 via a first gas supply line 18 located in the gas supply assembly 10 . A first gas supply line 18 is arranged to deliver gas from the liquid phase compartment 12.2 of the tank 12 to the gas consumer 14 . The first gas supply line opens at its first end (inlet end) to the lower part of the tank 12 below the surface of the liquefied gas in the tank. The liquid phase compartment contains a liquefied gas at a temperature of substantially −163° C. and at substantially atmospheric pressure. The first gas supply line 18 includes a first heat exchanger 24 configured to vaporize the liquefied gas into a gaseous gas within the first gas supply line 18 . Therefore, the first heat exchanger 24 can also be called a main gas evaporator. The first gas supply line 18 also includes a cryogenic pump 26 that increases the pressure of the liquefied gas so that the gas pressure meets the demand of the gas consumer 14 . A first heat exchanger 24 is located downstream of the cryogenic pump 26 . The first heat exchanger 24 transfers heat from the heat transfer medium into the gas to vaporize the liquefied gas and reduce the temperature of the gas from about −163° C. to +40° C., the preferred gas temperature for gas consumption. Increase to +50°C, typically +45°C. The first supply line 18 and the second supply line 16 may be connected to each other prior to connection to the engine 14, i.e. upstream. The mixture temperature of the natural boil-off gas and the forced boil-off gas is then +40°C to +70°C.

Boil-off gas is made available within the gas engine 14 by a second gas supply line 16 located in the gas supply assembly 10 . A second gas supply line 16 is arranged to deliver gas from the gas phase compartment 12.1 of the tank 12 to the gas engine 14 . The second gas supply line 16 is at its first end (inlet end) at the top of the tank 14 so that it is always connected to the gas phase compartment 12.1 above the surface of the liquefied gas in the tank 12. open to. The second gas supply line 16 includes a second heat exchanger 20 configured to heat the gas within the second gas supply line 16 to a desired temperature. The second gas supply line 16 also includes a compressor 28 that increases the pressure of the gas so that it is suitable for the gas engine 14 . Compressor 22 is advantageously a screw or rotary vane compressor. A second heat exchanger 20 is located upstream of the compressor 22 so that the gas temperature can be raised to levels suitable for screw or rotary vane compressors. The second heat exchanger is used to raise the temperature of the gas from about -163°C to -50°C to -20°C, which is the inlet temperature range for the gas entering the compressor 22, typically -25°C. A heat transfer medium is configured to transfer heat to the gas. Advantageously, the temperature of the gas is also increased in the compressor 22 to +40 to +70° C., typically 60° C., corresponding to the temperature of the gas suitable for introduction into the engine 14 .

The compressor 22 in the second feed line 16 is provided with compressor cooling means 28, 29 for maintaining the temperature of the compressor 22 within a desired range. The compressor uses oil, for example, for lubrication and control of the temperature of the compressor 22 . The compressor 22 includes an oil flow circuit 29 configured to direct oil flow to a third heat exchanger, the third heat exchanger 28 transferring heat transfer medium from the compressor oil. It is configured to transfer heat to a heat transfer medium within circuit 30 , thereby controlling not only the temperature of compressor 22 , but also the temperature of the boil-off gas within second gas supply line 16 . If desired, the oil flow circuit may be equipped with a circulation pump. Typically, the compressor creates its own differential pressure on the oil, where oil flow is provided without a separate pump. Oil is supplied to the compressor from the oil flow circuit while the compressor is operating. The oil lubricates the working parts of the compressor and receives heat so that the temperature of the oil increases as it flows through the compressor. The compressor may be equipped with an oil separator 22' that separates oil from the compressed gas. The oil heated in the compressor is cooled by the third heat exchanger 28 and recirculated to the compressor 22 . Optionally, compressor 22 may also be provided with an indirect cooling system to which a third heat exchanger 28 is coupled. The compressor includes a third heat exchanger 28, which may be implemented either as an integral part of the compressor or arranged in communication with the compressor 22 for heat transfer only. Since the temperature of the compressor 22 affects the temperature of the compressed gas, this is advantageously used as a method of controlling the boil-off gas temperature. The method utilizes compressor cooling means 28, 29 to maintain the temperature of the boil-off gas within a desired range. While the compressor 22 is operating, the temperature of the boil-off gas compressed by the compressor 22 is measured, and the compressor cooling means 28, 29 are operated based on the temperature of the boil-off gas. Therefore, when the boil-off gas temperature is higher than a predetermined set value, the compressor cooling power is increased, and when the boil-off gas temperature is lower than the predetermined set value, the compressor cooling power is decreased.

The assembly is configured to control the temperature of the gas supplied to the gas engine 14 via the first and second gas supply lines and to control the temperature of the compressor 22 in the second gas supply line 16. A heat transfer circuit 30 is included. Heat transfer circuit 30 includes a fourth heat exchanger 32 configured to transfer heat to a heat transfer medium within heat transfer circuit 30 . The heat transfer medium can be a water-based solution containing one or more antifreeze agents. A suitable heat transfer oil can also be used. Second heat exchanger 20 , first heat exchanger 24 , third heat exchanger 28 and fourth heat exchanger 32 are all connected to heat transfer circuit 30 . The heat transfer circuit also includes a pump 34 which causes the heat transfer medium to flow through the circuit 30 for circulation.

The fourth heat exchanger 32 is connected to a heat source 42 such as a steam system available to the assembly 10 to transfer heat to the heat transfer medium within the circuit 30 and raise the temperature within the fourth heat exchanger 32 . It is The circuit 30 includes a main circuit section 30' in which the heat transfer medium flows through the pump 34, the fourth heat exchanger 32 and the first heat exchanger 24. This is because most of the heat transferred to the heat transfer medium in the fourth heat exchanger 32 is used to vaporize the liquefied gas in the first heat exchanger 24 . The circuit 30 includes two junctions 38, 40, a first junction 38 upstream of the first heat exchanger 24 and a second junction 40 upstream of the first heat exchanger 24. It is arranged to be downstream of one heat exchanger 24 and a fourth heat exchanger 32 . The terms upstream and downstream are defined by the direction of heat transfer medium flow in the circuit section 30 relative to the pumps 34 in the circuit, which flow direction is indicated by the arrows on the circuit line. The circuit 30 is a sub-circuit extending from the first branch point 38 to the second branch point 40 parallel to the portion of the mail conduit 30' between the first branch point 38 and the second branch point 40. Includes compartment 30''. The second heat exchanger 20 and the third heat exchanger 28 are connected in series with the auxiliary circuit section 30'' such that the second heat exchanger 20 is arranged upstream of the third heat exchanger 28. be done. Thereby, the second heat exchanger 20 and the third heat exchanger 28 are arranged in parallel with the first heat exchanger 24 and derive from a common heat source 42 via the fourth heat exchanger 32 . The heat generated is used as a heat source for heating the gas in the second heat exchanger 20 and vaporizing the liquefied gas in the first heat exchanger 24 . The auxiliary circuit section 30'' comprises a first control valve 44 for controlling the portion of the heat transfer medium flowing through the first and third heat exchangers.

A third heat exchanger 28 configured to transfer heat from the compressor 22 and control its temperature is located in the auxiliary circuit section 30'' downstream of the second heat exchanger 20. . The third heat exchanger 28 comprises a bypass conduit 31 and a three-way valve 33 which regulates the proportion of heat transfer medium flow through the third heat exchanger 28 and heat transfer medium flow through the bypass conduit 31 . , and thus the cooling power of the third heat exchanger 28 .

As an example of a particular operating condition of the gas fuel supply assembly, the assembly operates as follows. Numerical values are only examples of specific practical applications of the invention and the values may differ in different practical solutions of the invention. When the heat transfer medium is caused to flow through circuit 30 by actuating pump 34, its temperature is raised from 27° C. to 47° C. in fourth heat exchanger 32, and the heat transfer medium is at that temperature. Enter second heat exchanger 20 and first heat exchanger 24 . The portion of the heat transfer medium directed to the auxiliary circuit section 30'' is controlled by a first valve 44 based on the temperature of the heat transfer medium after the second heat exchanger 20 and before the third heat exchanger 28. controlled. This temperature is measured by a first temperature probe 46 positioned between the second heat exchanger 20 and the third heat exchanger 28 within the auxiliary circuit section 30''. Generally, the temperature of the heat transfer medium between the second heat exchanger 20 and the third heat exchanger 28 is 35°C. The heat transfer medium in the auxiliary circuit section 30 ″ then flows into the third heat exchanger 28 , where the heat transfer medium is used to cool the compressor 22 so that the temperature rises within the third heat exchanger 28 . is raised. A side valve 33 for controlling the ratio of the heat transfer medium flow through the third heat exchanger 28 and the heat transfer medium flow through the bypass conduit 31 is based on the temperature of the boil-off gas at a location downstream of the compressor 22. controlled by The temperature of the boil-off gas at such location is measured by a second temperature probe 48 located in the second gas supply line 16 downstream of the compressor 22 . As the heat transfer medium receives heat in the third heat exchanger 28, its temperature typically rises to 50°C.

At the first branch point 38, the portion of the heat transfer medium not directed to the auxiliary circuit section 30'' is directed to further flow through the first heat exchanger 24 to the main circuit section 30'. The heat transfer medium enters first heat exchanger 24 at a temperature of about 47° C. and releases heat to vaporize and heat the liquefied gas in first gas supply line 18 . Typically, the temperature of the heat transfer medium after the first heat exchanger 24 is 25°C. After the first heat exchanger 24 the heat transfer medium is arranged to return to a fourth heat exchanger 32 where the heat transfer medium receives heat from a common heat source 42 . At a second junction 40, the heat transfer media from the auxiliary circuit section 30'' and the main circuit section 30' join. The power of the fourth heat exchanger is controlled based on the temperature of the heat transfer medium at locations downstream of the fourth heat exchanger 32 and the second branch point 40 . Downstream of the fourth heat exchanger 32 and the second branch point 40, a third temperature probe 50 is positioned in the main circuit section 30', thereby merging from the main circuit section 30' and the auxiliary circuit section 30''. The temperature of the heat transfer medium is measured. In this way, the mixture temperature of the return stream joined at the second junction 40 is taken into account and used as a variable to control the power of the fourth heat exchanger. The temperature of the heat transfer medium as it exits the third heat exchanger 28 is typically very high, which is advantageous because it does not require heating before being fed to the first or second heat exchangers. In the embodiment of FIG. 1, heat source 42 includes a steam system arranged to provide heat to a fourth heat exchanger. The fourth heat exchanger 32 includes a bypass conduit 35 for controlling the ratio of heat transfer medium flow through the fourth heat exchanger 32 and heat transfer medium flow through the bypass conduit 35 . of the three-way valve 52. A three-way control valve 52 controls the thermal power transferred to the heat transfer medium in the fourth heat exchanger. The operation of control valve 52 is controlled based on the measurement data of third temperature probe 50 . Heat source 42 is any suitable and available heat source, heat may be transferred to a suitable heat transfer medium, such as steam, water-based solutions, or heat transfer oil, which is available for use in the gas supply assembly. Advantageously, the engine 14 uses heat generated from one or more of a cylinder, block, oil, combustion air or other cooling system, exhaust gas boiler or other heat source within the engine.

Figure 2 schematically illustrates a gas supply assembly 10 according to another embodiment of the invention. Gas supply assembly 10 is configured to supply gaseous fuel to one or more gas consumers 14 connected to gas supply assembly 10 . The gas supply assembly shown in FIG. 2 provides substantially the same operation with substantially the same elements, but differs from that shown in FIG. 1 in the following features.

The fourth heat exchanger 32 uses the cooling system of the engine 14 as the heat source 42 and transfers heat to the heat transfer medium in the circuit 30 to raise its temperature within the fourth heat exchanger 32 . The circuit 30 includes two junctions 38, 40, a first junction 38 upstream of the first heat exchanger 24 and a second junction 40 upstream of the first heat exchanger 24. , but upstream of the fourth heat exchanger 32 . The terms upstream and downstream are defined by the direction of heat transfer medium flow in circuit section 30 and are indicated by the arrows in the circuit line.

The third heat exchanger 28 comprises a bypass conduit 31 and a three-way valve 33 which regulates the proportion of heat transfer medium flow through the third heat exchanger 28 and heat transfer medium flow through the bypass conduit 31 . , and thus the cooling power of the third heat exchanger 28 . A three-way valve 33 for controlling the ratio of the heat transfer medium flow through the third heat exchanger 28 and the heat transfer medium flow through the bypass conduit 31 provides compression at a location downstream of the third heat exchanger 28 . It is controlled based on the temperature of the machine cooling oil. Such temperature is measured by a second temperature probe 48 located in the cooling oil line of the compressor 22 downstream of the third heat exchanger 28 . As the heat transfer medium receives heat in the third heat exchanger 28, its temperature is typically raised to 50°C.

FIG. 2 also shows an embodiment of the invention in which valve 44 in auxiliary circuit section 30' is not used for continuous control, but is a manual balance valve that sets flow through auxiliary circuit section 30' once. This feature is also applicable to the embodiment of FIG.

At the first branch point 38, the portion of the heat transfer medium not directed to the auxiliary circuit section 30'' is directed to flow further through the first heat exchanger 24 to the main circuit section 30'. The heat transfer medium enters the first heat exchanger 24 at a temperature of about 47° C. where it releases heat to vaporize and heat the liquefied gas in the first gas supply line 18. do. Typically, the temperature of the heat transfer medium after the first heat exchanger 24 is 25°C. At the second junction 40 the heat transfer media from the auxiliary circuit section 30 ″ and the main circuit section 30 ′ join and return to the fourth heat exchanger 32 . The power of the fourth heat exchanger is controlled based on the temperature of the heat transfer medium downstream of the fourth heat exchanger 32 . Downstream of the fourth heat exchanger 32, a third temperature probe 50 is positioned in the main circuit section 30' to measure the temperature of the heat transfer medium. In the embodiment of FIG. 2, heat source 42 includes control valve 52 for controlling the power output of third heat exchanger 32 .

Although the invention has been illustrated herein in connection with what is presently considered to be the most preferred embodiments, the invention is not limited to the disclosed embodiments, but rather may incorporate various combinations or alterations of its features. As such, it is intended to cover other applications that fall within the scope of the invention as defined in the appended claims. Details mentioned in connection with any of the above embodiments may be used in connection with another embodiment where the combination is technically possible.

Claims (11)

A gas supply assembly comprising a tank configured to store a liquefied gas within the tank to have a vapor phase compartment and a liquid phase compartment, the assembly comprising: a first gas supply line configured to deliver gas from the phase compartment to one or more gas consumers; and a first gas supply line configured to deliver gas from the gas phase compartment of the tank to one or more gas consumers. a second gas supply line, the second gas supply line including a second heat exchanger configured to heat gas in the second gas supply line; includes a first heat exchanger configured to vaporize liquefied gas in the first gas supply line, the second gas supply line being connected to the second gas supply line further comprising a compressor configured to increase the pressure of the gas within, the compressor comprising a third heat exchanger;
The assembly includes a heat transfer circuit to which the first heat exchanger, the second heat exchanger and the third heat exchanger are connected, the heat transfer circuit being connected to the heat transfer circuit within the heat transfer circuit. a fourth heat exchanger configured to transfer heat to a heat medium; and pumping means configured to circulate the heat transfer medium within the heat transfer circuit; and the third heat exchanger are arranged in series with each other, the first heat exchanger is arranged in parallel with the second heat exchanger and the third heat exchanger, and the third heat exchanger is The gas supply assembly, wherein the heat transfer power of the exchanger is controllable based on the temperature of the boil-off gas at a location downstream of the compressor. 2. The gas supply assembly of claim 1, wherein said assembly includes a second temperature probe positioned in said second gas supply line downstream of said compressor. The heat transfer circuit includes two branch points, the circuit includes an auxiliary circuit section extending from the first branch point to the second branch point, and the circuit extends from the first branch point to the second branch point. a main circuit section extending to a branch point, wherein the second heat exchanger and the third heat exchanger are arranged in the auxiliary circuit section between the first branch point and the second branch point; 2. The gas distribution assembly of claim 1, wherein said first heat exchanger is positioned in said main circuit section between said first and second branch points. 4. The gas supply assembly of claim 3, wherein said auxiliary circuit section includes a first valve for controlling the portion of heat transfer medium passing through said auxiliary circuit section. The assembly includes a first temperature probe positioned in the heat transfer circuit between the second heat exchanger and the third heat exchanger, wherein the first valve detects the first temperature. 5. The gas delivery assembly of claim 4 , controlled based on a probe. 2. The gas supply assembly of claim 1, wherein the compressor includes an oil circuit, the oil circuit configured to pass through the third heat exchanger to cool oil in the circuit. The third heat exchanger for cooling the compressor comprises a bypass conduit and a valve for controlling heat transfer medium flow through the third heat exchanger and heat transfer medium through the bypass conduit. and said assembly includes a second temperature probe positioned in said second gas supply line downstream of said compressor, said valve controlling boil-off at a position downstream of said compressor. 2. The gas supply of claim 1, configured to control the flow of heat transfer medium through the third heat exchanger and the flow of heat transfer medium through the bypass conduit based on the temperature of the gas. assembly. The compressor includes an oil circuit, the oil circuit disposed through the third heat exchanger for cooling oil in the circuit, and the third heat in the heat transfer circuit. The exchanger comprises a bypass conduit and a three-way valve, the three-way valve controlling the proportion of heat transfer medium flow through the third heat exchanger and heat transfer medium flow through the bypass conduit; 2. The gas of claim 1, wherein the portion of the heat transfer medium flow through the heat exchanger and the portion of the heat transfer medium flow through the bypass conduit are controlled based on the temperature of the oil in the oil circuit. supply assembly. 4. The gas distribution assembly of claim 3, wherein said second branch point in said heat transfer circuit is downstream of said first heat exchanger and said fourth heat exchanger. 4. The gas distribution assembly of claim 3, wherein said second branch point within said heat transfer circuit is downstream of said first heat exchanger and upstream of said fourth heat exchanger. The assembly includes a third temperature probe positioned in the heat transfer circuit downstream of the fourth heat exchanger and the second branch point, wherein the power of the fourth heat exchanger is the third 11. A gas supply assembly according to claim 9 or 10, adapted to be controlled with a temperature probe of .

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