EP0874188A2 - Process for the treatment of cryogenic liquefied gas - Google Patents

Abstract

The deep-frozen liquid gas (1), before being used in the subsequent process is re-gasified in thermal exchange with at least one heat exchange medium (28,32). The refrigerating capacity of the deep-frozen gas as a heat sink is conveyed via a heat exchanger medium (28) at least to one of the part-steps in the process. In the case of unavailability of the heat exchanger medium, the deep-frozen liquid gas is re-gasified with an additional heat exchanger medium (32). The deep-frozen liquid gas is first divided into two part currents (30,33).

Description

Technical field

The invention relates to a method for processing frozen liquid gas, such as liquid natural gas (LNG) or liquid propane gas (LPG) or also technical gases, for a subordinate process engineering process, according to the preamble of claim 1.

State of the art

In addition to petroleum and its fission products, as well as coal, gasses are also being used today Energy sources, e.g. Natural gas and propane gas, as fuels for power plants or used in processes in the steel and chemical industries. Because Gases generally have a relatively large volume, they must be sufficient be compressed to provide effective transportation and the same Realize warehousing. However, since essential for the compression of gases more energy than is required to compress liquids, that will be Natural gas or the propane gas is initially liquefied. So-called arises Liquid natural gas (LNG) or liquid propane gas (LPG). Both the transportation as The storage of these liquefied gases will also be under atmospheric pressure and performed at temperatures of around minus 160 ° C. So it has to evaporates the respective frozen liquid gas before it is used as fuel, i.e. be gassed back.

According to p. 9 of brochure 100-3322 ○ MCI from CHIODA, printed in May 1995 in Japan, entitled "CHIODA in LPG / LNG recieving terminals", are for each of the refrigerated liquefied gases used a number of evaporators known in which to evaporate the low-temperature fuel required energy in the form of hot water, sea water or additional Fuel is supplied. After delivery of the evaporation process required heat quantity is the respective heat exchange medium again dissipated, whereby its cooling capacity is lost for the process.

In contrast, in many sub-processes in power plants, in the steel and the chemical industry requires cooling. According to the article "Refrigerated inlet cooling for new and retrofit installations "in the magazine Gas Turbine World, Volume 23, No. 3, May / June 1993, leads to the lowering of the air inlet temperature a gas turbine plant, i.e. the inlet temperature of the from Combustion air sucked in, significantly improving the output and heat consumption. This is done using external coolants such as stored ice, ammonia, freons, glycol etc. are used. The provision, the handling and environmentally friendly disposal of these additional However, coolant causes a considerable amount of work and with it costs.

Presentation of the invention

The invention tries to avoid all these disadvantages. It is based on the task a process for the processing of frozen liquid gas for extraction of process energy for a subordinate process engineering To create a process that also includes the cooling capacity of the frozen liquid gas can be used in the downstream process.

According to the invention, this is achieved in that in a method according to the preamble of claim 1, the cooling capacity of the frozen liquid gas at least via a heat exchange medium at least one of the substeps of Subordinate, process engineering process supplied as a heat sink becomes. With this method, the transferred to the heat exchange medium Cooling capacity of the frozen liquid gas used in the downstream process and therefore the use of external heat exchange media, including those with disadvantages associated with them can be significantly reduced. If not available This heat exchange medium becomes the frozen liquid gas with an additional one Gasified heat exchange medium. This step serves mainly the start of the downstream process engineering process and If the first heat exchange medium is otherwise unavailable, such as during repair work. Considered in itself, it is similar he the conventional method in which the heat exchange medium after the Back gasification of the frozen liquid gas is carried away from the process unused becomes.

To implement this process step, it is particularly expedient if the frozen liquid gas is initially divided into two partial flows, the first partial flow warmed up with an external heat exchange medium, back-gasified, then ignited and burned to form the additional heat exchange medium becomes. Finally, the second partial stream of the branched, frozen Liquid gas in heat exchange with the additionally formed heat exchange medium regasified, so that the supply of the subordinate, process engineering Process with the required gaseous medium guaranteed at all times is.

In general, this solution can be used for processes in the energy supply (power plants, energy distribution) in the steel industry or the chemical industry, in which frozen liquid gases, such as LNG or LPG or technical gases (e.g. N ₂ , O ₂ , NH ₃ etc.) evaporate must be and where there is a need for process cooling at the same time.

It is particularly advantageous if the first heat exchange medium is a working medium of the process downstream of the gasification and this Working medium in direct heat exchange with the frozen liquid gas is cooled. In a first embodiment of the invention, the Back gasification converted from the liquid to the gaseous state Finally, fuel is fed to a gas turbine process, there to one Flue gas burned and the latter relaxed for the purpose of work performance. The first heat exchange medium to be compressed in the gas turbine process Ambient air used.

The associated reduction in the air inlet temperature of the compressor leads to a significant improvement in the output and heat consumption in the gas turbine process. Because when using the frozen liquid gas no additional cooling medium for the ambient air to be drawn in Energy is required to provide an external coolant Energy consumption of the gas turbine process is reduced despite the higher output will. In addition to the costs for external coolants, there is also no need to use them associated environmental pollution.

It is also advantageous if, in addition to the first, a second heat exchange of the frozen liquid gas with a second heat exchange medium. Subsequently each heat exchange medium is a separate sub-step of subordinate process fed. In the process, gasification becomes re-gasified Fuel introduced into a gas turbine process, there to a flue gas burned and the latter relaxed for the purpose of work performance. As the first heat exchange medium also becomes ambient air to be compressed in the gas turbine process used. The second heat exchange medium is called a heat sink steam turbine process associated with the gas turbine process.

This solution is particularly suitable for cases where the frozen Liquefied gas has a cooling potential, which is due to the cooling capacity of the first Heat exchange medium is not fully usable. By using the second The heat exchange medium as a heat sink of the steam turbine process can cooling effort provided for this sub-process can be significantly reduced. Because of The greater number of switching options increases both the variability of the overall process as well as the number of possible users of the cold potential of frozen liquid gas. As a result of the division of the evaporation process in two process steps and thus at least partially, spatial separation of the evaporation process of the frozen liquid gas from the cooling process of the sucked in ambient air, the explosion protection of the Gas turbine plant improved.

It is particularly advantageous if water is the second heat exchange medium in this solution is used. The temperature of this water in the Heat exchange with the frozen liquid gas reduced to almost 0 ° C and that Water converted into ice water. At the same time, a turbulent flow in the Ice water generated.

Through the use of water as a second heat exchange medium and the lowering the temperature of the water up to the freezing point arises with the ice water a heat exchange medium, which advantageously has a high heat transfer when exchanging heat with the ambient air to be compressed in the gas turbine process guaranteed. The turbulent flow of ice water ensures this that the ice in the pipes of the intermediate cooling circuit is not sets. In addition, when using water, the use of Coolants such as ammonia, freons, glycol, etc. are dispensed with, both increases the safety of the entire process and protects the environment.

With the addition of an additive, the temperature of this water can change during heat exchange with the frozen liquid gas without risk of icing up the corresponding Pipelines can be lowered further. This makes a much larger part of the cold potential of the frozen liquid gas for cooling the downstream Process usable.

According to a second embodiment of the invention, at least as a heat sink one of the sub-steps of the re-gasification of the frozen liquid gas subordinate process a working medium of this subordinate Process used. This working medium is previously exchanged with a cooled first heat exchange medium and the latter after this heat exchange recirculated for heat exchange with the frozen liquid gas. Through the Back gasification converted from the liquid to the gaseous state Fuel is fed to a gas turbine process, there to one Flue gas burned and the latter relaxed for the purpose of work performance. How in the first embodiment, the working medium to be cooled in Gas turbine process used ambient air to be compressed. Due to the complete separation of the evaporation of the frozen liquid gas from the The explosion protection of the Gas turbine system can be significantly improved in the event of leakages.

Finally, in this embodiment of the invention, water is the first Heat exchange medium used. The temperature of this water in the Heat exchange with the frozen liquid gas reduced to almost 0 ° C and the water is converted into ice water. At the same time there is a turbulent flow generated in ice water. The associated benefits are the same the first embodiment of the invention.

Analogously to the first embodiment, the temperature can be increased when an additive is added this water in heat exchange with the frozen liquid gas without danger icing of the corresponding pipelines can be further reduced. This also means that a much larger part of the cold potential of the frozen is Liquid gas can be used for cooling the downstream process.

Brief description of the drawing

Fig. 1

eine schematische Darstellung der Aufbereitungsanlage zur Verdampfung des Flüssiggases;

Fig. 2

eine Darstellung entsprechend Fig. 1, bei der die Aufbereitungsanlage sowohl mit einer Gasturbinenanlage als auch mit einer Dampfturbine verbunden ist;

Fig. 3

eine Vorderansicht einer quergeschnittenen Rohrleitung des Zwischenkühlkreislaufs der Aufbereitungsanlage;

Fig. 4

eine Darstellung gemäss Fig. 2, jedoch entsprechend einem zweiten Ausführungsbeispiel.

In the drawing, two exemplary embodiments of the invention are shown on the basis of a system for processing frozen liquid gas for a downstream process engineering process. Show it:

Fig. 1

a schematic representation of the processing plant for the evaporation of the liquid gas;

Fig. 2

a representation corresponding to Figure 1, in which the processing system is connected to both a gas turbine system and a steam turbine.

Fig. 3

a front view of a cross-sectional pipeline of the intermediate cooling circuit of the processing plant;

Fig. 4

a representation of FIG. 2, but according to a second embodiment.

Only the elements essential for understanding the invention are shown. For example, the connection between the gas turbine system is not shown and the steam turbine serving water-steam cycle, i.e. the flow path the corresponding work equipment downstream of the gas and steam turbines. The direction of flow of the work equipment is indicated by arrows.

Way of carrying out the invention

The system for processing a frozen liquid gas 1 mainly consists from a main liquid gas line 2 with a storage tank 3 connected main evaporator / air cooler 4. The latter is connected downstream Main gas line 5, which the treatment plant with a downstream Plant 6 connects (Fig. 1). This subordinate system 6 has a process engineering Process in which the frozen liquid gas 1 as fuel or otherwise in a physical and / or chemical process is used and at the same time there is a need for process cooling. For example, a gas turbine system (Fig. 2) or a system the steel or chemical industry (not shown) with the processing plant be connected. Of course, several storage tanks 3 can also have one common processing plant to be connected to plant 6.

Inside the storage tank 3 is a feed pump 7 and in the main liquid gas line 2, outside the storage tank 3, a high-pressure feed pump 8 is arranged. A check valve 9 is formed between the two pumps 7, 8. Downstream of the high-pressure feed pump 8 branches from the main liquid gas line 2 from a return line 10 to the storage tank 3. In the return line 10, a throttle orifice 11 and a check valve 12 are arranged (FIG. 1).

Further downstream branches of the main liquid gas line 2, a first and a second sub-line 13, 14 from. In the first sub-line 13 are one after the other Shut-off valve 15, an auxiliary evaporator connected to a cooling circuit 16 17, a pressure control valve 18 and a burner 19 are formed. The burner 19 is Part of a flood evaporator arranged in the second sub-line 14 20, which is preceded by a shut-off valve 21 and a check valve 22 are. The latter is formed in an auxiliary gas line 23, which is downstream connects to the flood evaporator 20 and with its other end in the main gas line 5 opens.

Both between the junction of the two sub-lines 13, 14 and the Main evaporator / air cooler 4, as well as between the latter and the junction the auxiliary gas line 23, is in the main liquid gas line 2 or in the main gas line 5 each a further shut-off valve 24, 25 is arranged. In addition, the Main gas line 5 upstream of the system 6, a pressure control valve 26. One too connected to the system 6 intake line 27 for a first heat exchange medium 28 is the main liquid gas line 2 in the main evaporator / air cooler 4 arranged crossing. The first heat exchange medium 28 is ambient air used. Of course, the heat exchange instead of the cross-flow principle also by means of another heat exchange principle, for example in countercurrent or realized in the direct current principle or in wound heat exchangers (not shown).

In the storage tank 3 is used as frozen liquid gas 1, for example Liquefied natural gas (LNG) delivered by cooling tankers is stored. At normal operation of the plant 6 connected to the processing plant are shut-off valves arranged in the main liquid gas line 2 or in the main gas line 5 24, 25 opened and the shut-off valves 15, 21 of the sub-lines 13, 14 closed.

The liquefied natural gas stored in the storage tank 3 under atmospheric pressure (LNG) 1 is conveyed into the main liquid gas line 2 with the aid of the feed pump 7. The high-pressure feed pump 8 arranged there increases the pressure on the required operating pressure and passes the liquefied natural gas 1 at this operating pressure to the main evaporator / air cooler 4. This prevents between the two pumps 7, 8 arranged check valve 9 a backflow of the Liquid natural gas 1 via the main liquid gas line 2 into the storage tank 3 unused amount of liquefied natural gas 1 is via the return line 10 to Storage tank 3 returned. The throttle diaphragm 11 arranged there causes one Pressure reduction of the constantly flowing back minimum amount of frozen Liquid natural gas 1, starting from the pressure level downstream of the high-pressure feed pump 8, on that required for safe backflow into the storage tank 3 Pressure level. When the high pressure feed pump 8 is switched off, the non-return valve prevents 12 a backflow of the frozen liquid natural gas 1 from the Return line 10 into the main liquid gas line 2.

In the main evaporator / air cooler 4 there is a direct heat exchange between the Liquid natural gas 1 and ambient air 28 located in the intake line 27 becomes the evaporation energy required for the gasification of the liquid natural gas 1 by heat exchange between the intake ambient air 28 and the liquefied natural gas 1. As a result, on the one hand arises gaseous fuel 29, in this case natural gas, which burned in the system 6 becomes. The requirements are met by means of the pressure reducing valve 26 the system 6 corresponding gas pressure set. On the other hand, the suctioned Ambient air 28 cooled down, reducing the cooling needs of the downstream Appendix 6 can be satisfied. The as the working medium of the subordinate System 6 serving and sucked in by this ambient air 28 is thus at the same time the first heat exchange medium of the processing plant and the air cooler 4 becomes their main evaporator.

At the start of the plant 6 connected to the processing plant, the latter Sufficient gaseous fuel 29 is immediately required. At this time However, there is still no ambient air drawn in in the main evaporator / air cooler 4 28 for the gasification of the gas present in the main liquid gas line 2, frozen liquid gas 1 available. Therefore, first of all the shut-off valves 24, 25 closed, causing the main evaporator / air cooler 4 from the processing plant is removed. Opening takes place at the same time the shut-off valves 15, 21 arranged in the two sub-lines 13, 14 Sub-line 13 flows in a first partial stream 30 of the liquid natural gas 1, which under the influence of an external heat exchange medium circulating in the cooling circuit 16 31 in the auxiliary evaporator 17 to a gaseous fuel 29 ' is gassed back. The requirements are met by means of the pressure reducing valve 18 the burner 19 corresponding gas pressure set. As an external Heat exchange medium 31 seawater is used, but of course others suitable media can be used.

After the gaseous fuel 29 ′ has flowed into the burner 19 this ignited so that 20 hot flue gases 32 in the flood evaporator arise. This additional and internal heat exchange medium 32 is used for Back gasification of a second partial flow supplied via the second partial line 14 33 of liquid natural gas 1. The resulting gaseous fuel 29 "is fed into the main gas line 5 via the auxiliary gas line 23 and is therefore available in subordinate Appendix 6. A backflow of the gaseous fuel 29 "in the flood evaporator 20 is by the Check valve 22 prevented. When plant 6 has started up and is sufficient Ambient air 28 sucks, the main evaporator / air cooler 4 in the Processing plant switched. This is done by opening the previously closed one Shut-off valves 24, 25 and simultaneous closing of the two sub-lines 13, 14 arranged shut-off valves 15, 21.

In the event of a failure, but also for a scheduled repair of the system 6 the main evaporator / air cooler 4 is not in operation. In this case, the processing plant, as already described above, on the flood evaporator 20 switched over and the gaseous fuel 29 ″ generated there via one in FIG. 1 Gas line 34 shown in dashed lines to an external consumer (not shown) fed. Of course, instead of the flood evaporator 20, a other, suitable auxiliary evaporators are used.

In a first embodiment of the invention, that of the processing plant Subordinate system 6 as a gas turbine system, with a compressor 35, one Combustion chamber 36 and a gas turbine 37 are formed. So it's on the main gas line 5 connecting the main evaporator / air cooler 4 downstream the combustion chamber 36 connected, while the suction line 27 for the ambient air 28 opens into the compressor 35. The gas turbine 37 and the compressor 35 are mounted on a common shaft 38, which at the same time also Generator 39 takes up (Fig. 2).

In addition, the treatment plant has a second one, parallel to the main evaporator / air cooler 4 arranged in the main gas line 5 evaporator 40. For this purpose, the main liquid gas line 2 branches at an upstream of the second Evaporator 40 formed branch point 41 in two liquid gas sub-lines 42, 43. In the first liquid gas line 42 is the main evaporator / Air cooler 4 arranged essentially as already described above. Deviating on the outlet side thereof, it has an intermediate line 44 to a junction 45 attacking in the outlet side of the second evaporator 40 Main gas line 5. The shutoff valve 24 of the main evaporator / air cooler 4 is in the first liquid gas line 42 and the shut-off valve 25 in the intermediate line 44 trained. The second liquid gas sub-line 43 takes the second evaporator 40, with a shut-off valve between this and the branch point 41 46 is arranged. Another shut-off valve 47 is in the main gas line 5, between the second evaporator 40 and the junction 45 the intermediate line 44 is formed. In addition, the main gas line 5 has in the area a non-return valve between the second evaporator 40 and the shut-off valve 47 48.

The second evaporator 40 is in an intermediate cooling circuit consisting of pipes 49 50 arranged, which a recirculation pump 51, a High tank 52 and a second cooler 53 for a second heat exchange medium 54 records. This second cooler 53 is part of a main cooling circuit 55 one steam turbine 56 connected to the gas turbine system 6. The main cooling circuit 55 is with a main cooler 57 and a main cooling water pump 58 equipped. It is connected to a cooling source 59 via the main cooler 57, as such a cooling tower, air cooling or sea or River water can be used. The pipes 49 of the intermediate cooling circuit 50 are inside with several spiral ribs 60 provided (Fig. 3).

The steam turbine seated on a common shaft 61 with a generator 62 56 is both on the steam inlet side via a live steam line 63 and steam output side via an exhaust steam line 64 with a not shown Water-steam cycle and connected to the gas turbine 37 via the latter. In the steam line 64, a condenser 65 is arranged, to which a downstream Connects water pipe 66 with an integrated condensate pump 67. The condenser 65 has a in the main cooling circuit 55 and from this branching cooling circuit 68 (Fig. 2).

When the gas turbine system 6 and the steam turbine 56 are operating, this becomes in the storage tank 3 stored liquefied natural gas (LNG) 1 in the processing plant into one gaseous fuel 29, i.e. Gasified back to natural gas. The natural gas 29 is in the Combustion chamber 36 of the gas turbine system 6 burned. This creates smoke gases 69, which are relaxed in the gas turbine 37 and both their drive and also, via the shaft 38, the drive of the compressor 35 and the generator 39 to serve. The turbine exhaust gases are then shown in a not shown Water-steam cycle converted to live steam using known methods. The one forwarded to the steam turbine 56 via the live steam line 63 Live steam is expanded in this and thus drives the generator 62. in the Condenser 65, the exhaust steam from the steam turbine 56 is condensed and the resultant Water is recirculated into the water-steam cycle.

The gasification of the liquefied natural gas 1 takes place through a direct heat exchange with the ambient air 28 drawn in by the compressor 35 in the main evaporator / air cooler 4 of the processing plant. This turns to evaporation required energy by cooling the intake ambient air 28 won the liquefied natural gas 1. The use of the significantly cooled down Ambient air 28 as the working medium of the compressor 35 improves its effectiveness and that of the entire gas turbine system 6. The ambient air is 28 thus at the same time the first heat exchange medium of the treatment plant and the air cooler 2 becomes its main evaporator.

For the evaporation of the liquid natural gas 1 from the ambient air drawn in 28 available energy fluctuates depending on the season. In addition comes that at a low temperature of the sucked ambient air 28, as is regularly the case in winter, no need to cool them consists. Accordingly, the required evaporation energy at the corresponding Operating conditions taken from the main cooling circuit 55. As required can the evaporation of liquid natural gas 1 both in the main evaporator / air cooler 4 and also in the second evaporator 40, or only in one of the two expire. However, if the cooling potential of the liquid natural gas 1 by the cooling capacity of the first heat exchange medium 28 is not fully usable both evaporation processes used simultaneously.

This takes place in the evaporator 40, parallel to that in the main evaporator / air cooler 4 first heat exchange taking place, a second heat exchange of the liquid natural gas 1 with a second heat exchange medium 54. For this purpose, the recirculation pump delivers 51 in the high tank 52 as second heat exchange medium 54 in stock Water to the main cooling circuit 55 and then back to the evaporator 40. In addition to storing the water 54, the high tank 52 is also used for control the suction pressure of the recirculation pump 51 and also as a level compensating tank. When exchanging heat with the frozen liquid natural gas 1 the temperature of the water 54 lowered to almost 0 ° C and thereby a part of water 54 is converted to ice so that downstream of evaporator 40 Ice water 54 'is located in the intermediate cooling circuit 50.

The spiral ribs 60 create in the pipes 49 of the intermediate cooling circuit 50 a turbulent flow of ice water 54 ', so that in the No ice can settle inside the pipes 49 (FIG. 3). Of course this can Effect by other passive means, such as appropriate Inserts or non-stick coatings, or by active means, e.g. rotating Vortex generators are supported (not shown). With this ice water 54 ' effective cooling of the cooling medium 70 of the condenser 65 is made possible.

Alternatively or in addition to the measures described so far 54 additives (e.g. various salts) added to the water. With that, the Temperature of the ice water formed during the heat exchange with the liquid natural gas 1 54 'without risk of icing of the piping 49 well below 0 ° C lower. In this way, a much larger part of the cold potential of liquid natural gas 1 used for cooling the downstream process will.

The main cooler 57 and the cooling source 59 have the same function as that Second cooler 53. They are used when the cold potential of the liquid natural gas 1 is not sufficient for the required cooling purposes or if the treatment plant for the liquid natural gas 1 is not in operation and still one There is a cooling requirement.

Of course, the second evaporator 40 can also via the intermediate cooling circuit 50 with other users, for example with the water-steam cycle, not shown the steam turbine 56 are connected. So the cold potential of liquid natural gas 1 can be used even better. There are also several Circuit options that increase the variability of the system.

In a second exemplary embodiment, the one downstream of the processing plant System 6 also as interacting with a steam turbine 56 Gas turbine plant trained. The compressor 35 is via the intake line 27 connected to an air cooler 71. In the main LPG line 2 is a Main evaporator 72 for the liquid natural gas 1 is arranged. The main evaporator 72 is part of a cooling circuit 73, in which in addition to the high tank 52 and the recirculation pump 51 and the air cooler 71 of the compressor 35 of the gas turbine system 6 is arranged in series. Downstream of the air cooler 71 are in Cooling circuit 73 a shut-off valve 74 and upstream of the air cooler 71 a control valve 75 formed (Fig. 4). An intermediate cooling circuit is parallel to the cooling circuit 73 76 arranged, which the cooling circuit 73 with the analog of the first Embodiment trained main cooling circuit 55 connects. The intermediate cooling circuit 76 has two shut-off valves 77, 78, with which the processing plant depending on the specific operating situation separated from the main cooling circuit 55 or can be connected to it.

As in the first embodiment, the compressor 35 also draws in Ambient air 28 'is a working medium for the gasification of the liquefied natural gas 1 following process as a heat sink of this subordinate process used. However, the ambient air 28 'is previously exchanged with the heat cooled a first heat exchange medium 79 and the latter after this heat exchange recirculated for heat exchange with the frozen liquid natural gas 1. Water is used as the first heat exchange medium 79, which is used for heat exchange with the frozen liquid natural gas 1 analogous to the first embodiment is partially converted into ice. Accordingly, it is located downstream of the main evaporator 72 ice water 79 'in the cooling circuit 73. By means of the spiral Ribs 60 are also in the pipes 49 of the cooling circuit 73 Vortexes are generated which keep the ice water 79 'flowable and freezing prevent the piping 49 (Fig. 3). Depending on the cooling requirements of the system and the cooling potential of the liquid natural gas 1 is effective cooling both the ambient air and the cooling medium 70 of the condenser 65 enables. In addition to the main evaporator 72, this can be done by appropriate Closing or opening of valves 74, 75 or shut-off valves 77, 78, optionally either the air cooler 71 and / or the intermediate cooling circuit 76 are operated are (Fig. 4).

The gaseous fuel 29 obtained during the re-gasification also becomes fed to the combustion chamber 36, burned there to a flue gas 69 and the latter relaxed for the purpose of work in the gas turbine 37. All further Method steps proceed analogously to the first exemplary embodiment.

Reference list

1

frozen liquid gas, liquid natural gas (LNG)

2nd

Main LPG line

3rd

Storage tank

4th

Main evaporator / air cooler

5

Main gas line

6

Plant, gas turbine plant

7

Feed pump, pump

8th

High pressure feed pump, pump

9

check valve

10th

Return line

11

Restrictor

12th

Check valve

13

Partial line, first

14

Partial line, second

15

Shut-off valve

16

Cooling circuit

17th

Auxiliary evaporator

18th

Pressure control valve

19th

burner

20th

Flood evaporator

21

Shut-off valve

22

Check valve

23

Auxiliary gas line

24th

Shut-off valve

25th

Shut-off valve

26

Pressure control valve

27

Suction pipe

28

first heat exchange medium, ambient air

29

gaseous fuel, natural gas

30th

Partial flow, first

31

external heat exchange medium, sea water

32

additional heat exchange medium, flue gas

33

Partial flow, second

34

Gas pipe

35

compressor

36

Combustion chamber

37

Gas turbine

38

wave

39

generator

40

Evaporator, second

41

Branch point

42

Liquid gas sub-line, first

43

Liquid gas sub-line, second

44

Intermediate line

45

Confluence

46

Shut-off valve, in 43

47

Shut-off valve

48

Check valve

49

Pipeline

50

Intermediate cooling circuit

51

Recirculation pump

52

High tank

53

Secondary cooler

54

second heat exchange medium, water

55

Main cooling circuit

56

Steam turbine

57

Main cooler

58

Main cooling water pump

59

Cooling source

60

Rib (in 49)

61

wave

62

generator

63

Live steam line

64

Steam pipe

65

capacitor

66

Water pipe

67

Condensate pump

68

Cooling circuit

69

Flue gas

70

Cooling medium

71

Air cooler

72

Main evaporator

73

Cooling circuit

74

Shut-off valve, in 73

75

Control valve, in 73

76

Intermediate cooling circuit

77

Shut-off valve, in 76

78

Shut-off valve, in 76

79

first heat exchange medium, water

28 '

Ambient air, working medium

29 '

gaseous fuel

29 "

gaseous fuel

54 '

Ice water

79 '

Ice water

Claims (12)

Process for processing frozen liquid gas for a downstream, Process engineering that takes place in several steps Process in which the frozen liquid gas (1) is used in the downstream process, in heat exchange with at least one heat exchange medium (28, 32, 54, 79) is gasified again, characterized in that that the cooling capacity of the frozen liquid gas (1) as a heat sink at least one of the at least one heat exchange medium (28, 54, 79) Sub-steps of the downstream process fed and the frozen LPG (1) if this heat exchange medium (28, 54, 79) is gasified back with an additional heat exchange medium (32). A method according to claim 1, characterized in that the frozen Liquid gas (1) is first divided into two partial streams (30, 33), the first Partial gas (30) back gasified with an external heat exchange medium (31), then ignited and with the formation of the additional heat exchange medium (32) is burned while the second partial flow (33) of frozen liquid gas (1) in heat exchange with the additional heat exchange medium (32) is gassed back. A method according to claim 1 or 2, characterized in that a first Heat exchange medium (28) in direct heat exchange with the frozen Liquid gas (1) cooled and as the first heat exchange medium (28) a working medium of the downstream process is used. A method according to claim 3, characterized in that in addition to first a second heat exchange of the frozen liquid gas (1) with a second heat exchange medium (54) and then each Heat exchange medium (28, 54) a separate sub-step of the downstream Process is fed. A method according to claim 1 or 2, characterized in that as a heat sink of the at least one sub-step of the subordinate process a working medium (28 ') of the downstream process is used Working medium (28 ') previously in heat exchange with a first heat exchange medium (79) cooled and the latter after this heat exchange is recirculated for heat exchange with the frozen liquid gas (1). A method according to claim 3, characterized in that the frozen Gasified liquid gas (1) back to a gaseous fuel (29), this gaseous fuel (29) fed to a gas turbine process, there a flue gas (69) burned and the latter for the purpose of work is relaxed, with ambient air to be compressed in the gas turbine process is used as the first heat exchange medium (28). A method according to claim 4, characterized in that the frozen Gasified liquid gas (1) back to a gaseous fuel (29), this gaseous fuel (29) fed to a gas turbine process, there a flue gas (69) burned and the latter for the purpose of work is relaxed, with ambient air to be compressed in the gas turbine process used as the first heat exchange medium (28) and the second Heat exchange medium (54) as a heat sink with the gas turbine process associated steam turbine process is used. A method according to claim 5, characterized in that the frozen Gasified liquid gas (1) back to a gaseous fuel (29), this gaseous fuel (29) fed to a gas turbine process, there a flue gas (69) burned and the latter for the purpose of work is relaxed, with ambient air to be compressed in the gas turbine process than the working medium cooled by the first heat exchange medium (79) (28 ') is used. A method according to claim 4 or 7, characterized in that as second heat exchange medium (54) water is used, the temperature this water (54) in heat exchange with the frozen liquid gas (1) lowered to almost 0 ° C, thereby converting the water (54) into ice water (54 ') and at the same time creates a turbulent flow in the ice water (54 ') becomes. A method according to claim 9, characterized in that the water (54) added an additive and the temperature of this water (54) in heat exchange is further lowered with the frozen liquid gas (1). A method according to claim 5 or 8, characterized in that the first Heat exchange medium (79) water is used, the temperature this water (79) in heat exchange with the frozen liquid gas (1) lowered to almost 0 ° C, thereby converting the water (79) into ice water (79 ') and at the same time creates a turbulent flow in the ice water (79 ') becomes. A method according to claim 11, characterized in that the water (79) added an additive and the temperature of this water (79) in heat exchange is further lowered with the frozen liquid gas (1).

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