CN114321700A - Storage system and storage method of clean fuel - Google Patents
Storage system and storage method of clean fuel Download PDFInfo
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- CN114321700A CN114321700A CN202111669246.4A CN202111669246A CN114321700A CN 114321700 A CN114321700 A CN 114321700A CN 202111669246 A CN202111669246 A CN 202111669246A CN 114321700 A CN114321700 A CN 114321700A
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- 239000000446 fuel Substances 0.000 title claims abstract description 161
- 238000000034 method Methods 0.000 title claims abstract description 26
- 239000007788 liquid Substances 0.000 claims abstract description 186
- 239000003507 refrigerant Substances 0.000 claims abstract description 83
- 238000004781 supercooling Methods 0.000 claims description 27
- 239000007921 spray Substances 0.000 claims description 8
- 230000000694 effects Effects 0.000 abstract description 8
- 238000005265 energy consumption Methods 0.000 abstract description 6
- 238000013461 design Methods 0.000 abstract description 4
- 238000012423 maintenance Methods 0.000 abstract description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 10
- 239000007789 gas Substances 0.000 description 6
- 239000003949 liquefied natural gas Substances 0.000 description 6
- 238000011084 recovery Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 229910052757 nitrogen Inorganic materials 0.000 description 5
- 238000005057 refrigeration Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000003912 environmental pollution Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000007907 direct compression Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Abstract
The invention discloses a storage system and a method of clean fuel, wherein the storage system comprises a storage tank for storing liquid clean fuel, a first heat exchanger for absorbing heat of the liquid clean fuel, and a refrigerator for providing refrigerant for the first heat exchanger; a liquid clean fuel circulating pipeline is connected between the storage tank and the first heat exchanger, and a refrigerant circulating pipeline is connected between the first heat exchanger and the refrigerator. The system has the advantages of simple structure, reasonable design, convenient implementation, low maintenance cost and greatly reduced energy consumption, can be effectively applied to the storage of clean fuel by combining a storage method, does not generate BOG, has no pollution to the environment, is suitable for intermittent operation, can meet the operation scenes of peak regulation and non-peak regulation periods of a peak regulation station, has good use effect and is convenient to popularize and use.
Description
Technical Field
The invention belongs to the technical field of clean fuel storage, and particularly relates to a clean fuel storage system and a clean fuel storage method.
Background
With the development of social economy, the problems of energy shortage and environmental pollution are increasingly highlighted, and the utilization of clean energy becomes the subject of fuel consumption of the contemporary society. Natural gas has become the first choice for fuel consumption in most countries due to its advantages of high calorific value, low pollution, small volume after liquefaction, easy storage, convenient transportation, etc.
At present, LNG (liquefied natural Gas) stations at home and abroad store LNG in storage tanks with good heat insulation, but BOG (Boil Off Gas, which is Gas evaporated due to heat leakage of a system) is still generated in the storage process, and the generation of the BOG can increase the working pressure of equipment in the stations, so that the equipment works at overpressure, and great potential safety hazard is caused. Therefore, BOG handling becomes a key issue for the safe operation of LNG plants. Among the greenhouse effect of gases, CH4Second to CO only2Greenhouse gas, the global warming potential of which is CO 221 times of the total weight of the powder. In non-emergency situations, reducing the operating pressure of LNG plant facilities by directly discharging BOG not only causes fuel waste and economic loss, but also aggravates the greenhouse effect. Therefore, the recycling of the BOG can solve various problems caused by the BOG to the maximum extent.
In the prior art, various researchers in various countries propose various basic BOG treatment technologies aiming at BOG recovery, including pulse tube cryocooler recovery, liquid nitrogen recovery, nitrogen expansion recovery, jet refrigeration recovery, mixed refrigerant refrigeration recovery, direct compression treatment and the like. However, these technologies are directed to how to recycle the generated BOG, and although they have a certain role in energy saving, they do not solve the essential problem, how to reduce the BOG, and even to prevent the generation of the BOG, which is the essence that actually solves various adverse effects caused by the BOG. In addition, the existing BOG reliquefaction equipment needs a compressor, a heat exchanger, a recondenser and the like, and has complex process, large equipment floor area and large energy consumption.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a storage system for clean fuel, which has the advantages of simple structure, reasonable design, convenient implementation, low maintenance cost and greatly reduced energy consumption, can be effectively applied to the storage of clean fuel by combining a storage method, has no BOG generation, has no pollution to the environment, is suitable for intermittent operation, can meet the operation scenes of peak regulation and non-peak regulation periods of a peak regulation station, has good use effect and is convenient to popularize and use.
In order to solve the technical problems, the invention adopts the technical scheme that: a clean fuel storage system comprising a tank for storing a liquid clean fuel and a first heat exchanger for absorbing heat from the liquid clean fuel, and a refrigerator providing refrigerant to the first heat exchanger; a liquid clean fuel circulating pipeline is connected between the storage tank and the first heat exchanger, and a refrigerant circulating pipeline is connected between the first heat exchanger and the refrigerator.
The storage system for the clean fuel is characterized in that a storage tank liquid outlet and a storage tank liquid return port are formed in the storage tank, and the storage tank liquid return port is connected with a liquid return device located in the storage tank.
The storage system of foretell clean fuel, liquid device includes back the liquid pipe, the one end and the storage tank of returning the liquid pipe return the liquid mouth intercommunication, the other end that returns the liquid pipe stretches into the bottom in the storage tank.
The storage system of foretell clean fuel, return liquid device including setting up the shower at the storage tank internal top, the shower returns liquid mouth intercommunication with the storage tank, be provided with a plurality of shower nozzles on the shower.
In the clean fuel storage system, the first heat exchanger is provided with a liquid clean fuel inlet and a liquid clean fuel outlet, and a refrigerant inlet and a refrigerant outlet; the liquid clean fuel circulation pipeline comprises a first pipeline and a second pipeline, one end of the first pipeline is communicated with a liquid outlet of the storage tank, the other end of the first pipeline is communicated with a liquid clean fuel inlet, one end of the second pipeline is communicated with a liquid clean fuel outlet, and the other end of the second pipeline is communicated with a liquid return port of the storage tank.
In the storage system for clean fuel, the refrigerator is provided with the refrigerator liquid outlet and the refrigerator liquid return port, the refrigerant circulating pipeline comprises a third pipeline and a fourth pipeline, one end of the third pipeline is communicated with the refrigerator liquid outlet, the other end of the third pipeline is communicated with the refrigerant inlet, one end of the fourth pipeline is communicated with the refrigerant outlet, and the other end of the fourth pipeline is communicated with the refrigerator liquid return port.
In the clean fuel storage system, the second heat exchanger is connected to the storage tank.
The invention also discloses a storage method of the clean fuel, which adopts the storage system and comprises the following steps:
step one, collecting storage parameters of liquid clean fuel in the storage tank;
when the storage parameter exceeds a set value, the refrigerator provides refrigerant for the first heat exchanger through a refrigerant circulating pipeline, and the liquid clean fuel in the storage tank enters the first heat exchanger through the liquid clean fuel circulating pipeline;
step three, in the first heat exchanger, the refrigerant exchanges heat with liquid clean fuel, and the liquid clean fuel is subjected to supercooling treatment;
and step four, circulating the liquid clean fuel subjected to the supercooling treatment back to the storage tank.
In the above storage method of clean fuel, in the first step, the storage parameter of the liquid clean fuel includes at least one of pressure and temperature in the storage tank.
In the above method for storing clean fuel, in the second step, the refrigerator collects the temperature of the liquid clean fuel after the supercooling treatment and adjusts the flow rate of the refrigerant while providing the refrigerant to the first heat exchanger through the refrigerant circulating line.
Compared with the prior art, the invention has the following advantages:
1. the system of the invention has simple structure, reasonable design and convenient realization.
2. The invention has simple process, small floor area of equipment, low maintenance cost in the operation process and greatly reduced energy consumption.
3. The invention reduces the temperature of the liquid clean fuel by carrying out the supercooling circulation treatment on the liquid clean fuel, thereby achieving the purpose of generating no BOG.
4. The invention can be effectively applied to the storage of clean fuel, does not generate BOG, has no pollution to the environment, is suitable for intermittent operation, can meet the operation scenes of peak regulation and non-peak regulation periods of a peak regulation station, has good use effect and is convenient to popularize and use.
In conclusion, the system disclosed by the invention is simple in structure, reasonable in design, convenient to implement, low in maintenance cost and greatly reduced in energy consumption, can be effectively applied to storage of clean fuel by combining a storage method, is free from BOG (boil off gas) generation, has no pollution to the environment, is suitable for intermittent operation, can meet the operation scenes of peak regulation and non-peak regulation periods of a peak regulation station, is good in use effect and convenient to popularize and use.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
FIG. 1 is a schematic diagram of a storage system according to embodiment 1 of the present invention;
FIG. 2 is a schematic diagram of a storage system according to embodiment 2 of the present invention;
FIG. 3 is a schematic diagram of a storage system according to embodiment 3 of the present invention;
FIG. 4 is a schematic diagram of a storage system according to embodiment 4 of the present invention;
fig. 5 is a schematic diagram of a storage system according to embodiment 5 of the present invention.
Description of reference numerals:
1, a storage tank; 2-a first heat exchanger; 3, a refrigerator;
4-liquid clean fuel circulation pipeline; 4-1 — a first conduit; 4-2 — a second conduit;
5-refrigerant circulation line; 5-1 — a third pipeline; 5-2-fourth line;
6-a storage tank liquid outlet; 7-liquid return port of storage tank; 8-a liquid return pipe;
9-a spray pipe; 10-a spray head; 11-liquid clean fuel inlet;
12-outlet of liquid clean fuel; 13-a refrigerant inlet; 14-a refrigerant outlet;
15-the refrigerator outlet; 16-a liquid return port of the refrigerator; 18-a second heat exchanger;
19-an unloading system; 20-unloading pipe line; 21-unloading liquid clean fuel inlet;
22-an unloading liquid clean fuel outlet; 23-fifth pipeline.
Detailed Description
Example 1
As shown in fig. 1, the storage system of clean fuel of the present invention includes a storage tank 1 for storing liquid clean fuel and a first heat exchanger 2 for absorbing heat of the liquid clean fuel, and a refrigerator 3 for supplying refrigerant to the first heat exchanger 2; a liquid clean fuel circulation pipeline 4 is connected between the storage tank 1 and the first heat exchanger 2, and a refrigerant circulation pipeline 5 is connected between the first heat exchanger 2 and the refrigerator 3.
In this embodiment, be provided with storage tank liquid outlet 6 and storage tank liquid return opening 7 on storage tank 1, storage tank liquid return opening 7 is connected with the liquid return pipe 8 that is located storage tank 1, the one end and the storage tank of liquid return pipe 8 return opening 7 intercommunication, the other end of liquid return pipe 8 stretches into the bottom in storage tank 1.
During specific implementation, the liquid clean fuel in the storage tank 1 enters the first heat exchanger 2 through the liquid clean fuel circulation pipeline 4, the refrigerator 3 provides refrigerant for the first heat exchanger 2 through the refrigerant circulation pipeline 5, the refrigerant exchanges heat with the liquid clean fuel to perform supercooling treatment on the liquid clean fuel, and the liquid clean fuel after supercooling treatment enters the return storage tank 1 through the return liquid pipe 8. The temperature in the accumulator 1 is related to the degree of supercooling of the liquid clean fuel, i.e., to the flow rate of the refrigerant supplied from the refrigerator 3. Selection of refrigerator 3 in this example: the flow rate of the refrigerant needs to meet the amount of heat exchange requirements, and is related to the load of equipment, the temperature of the refrigerator 3 needs to ensure the requirement of supercooling degree, and the refrigerant can adopt liquid nitrogen.
Example 2
As shown in fig. 2, the storage system of clean fuel of the present invention includes a storage tank 1 for storing liquid clean fuel and a first heat exchanger 2 for absorbing heat of the liquid clean fuel, and a refrigerator 3 for supplying refrigerant to the first heat exchanger 2; a liquid clean fuel circulation pipeline 4 is connected between the storage tank 1 and the first heat exchanger 2, and a refrigerant circulation pipeline 5 is connected between the first heat exchanger 2 and the refrigerator 3.
In this embodiment, be provided with storage tank liquid outlet 6 and storage tank liquid return port 7 on the storage tank 1, storage tank liquid return port 7 is connected with the shower 9 that sets up top in storage tank 1, be provided with a plurality of shower nozzles 10 on the shower 9.
In specific implementation, different from embodiment 1, the liquid clean fuel after the super-cooling treatment is returned to the storage tank 1 through the spray pipe 9 and sprayed on the top of the storage tank 1 through the spray head 10, so that the temperature of the gas at the top of the storage tank 1 can be reduced, even the gas is liquefied, and the pressure in the storage tank 1 is reduced.
Example 3
As shown in fig. 3, the storage system of clean fuel of the present invention includes a storage tank 1 for storing liquid clean fuel and a first heat exchanger 2 for absorbing heat of the liquid clean fuel, and a refrigerator 3 for supplying refrigerant to the first heat exchanger 2; a liquid clean fuel circulation pipeline 4 is connected between the storage tank 1 and the first heat exchanger 2, and a refrigerant circulation pipeline 5 is connected between the first heat exchanger 2 and the refrigerator 3.
In this embodiment, be provided with storage tank liquid outlet 6 and storage tank liquid return port 7 on the storage tank 1, storage tank liquid return port 7 is connected with the liquid device that returns that is located storage tank 1.
In the embodiment, the first heat exchanger 2 is provided with a liquid clean fuel inlet 11 and a liquid clean fuel outlet 12, and a refrigerant inlet 13 and a refrigerant outlet 14; the liquid clean fuel circulation pipeline 4 comprises a first pipeline 4-1 and a second pipeline 4-2, one end of the first pipeline 4-1 is communicated with a liquid outlet 6 of the storage tank, the other end of the first pipeline 4-1 is communicated with a liquid clean fuel inlet 11, one end of the second pipeline 4-2 is communicated with a liquid clean fuel outlet 12, and the other end of the second pipeline 4-2 is communicated with a liquid return port 7 of the storage tank.
In particular, the liquid clean fuel in the tank 1 is introduced into the first heat exchanger 2 through the first pipe 4-1 and returned to the tank 1 through the second pipe 4-2.
When unloading is to be carried out, as shown in fig. 3, the unloading system 19 is connected directly to the second pipe 4-2 via an unloading pipe 20, and the unloaded liquid clean fuel is introduced directly into the tank 1.
In this embodiment, the refrigerator 3 is provided with a refrigerator liquid outlet 15 and a refrigerator liquid return port 16, the refrigerant circulation line 5 includes a third line 5-1 and a fourth line 5-2, one end of the third line 5-1 is communicated with the refrigerator liquid outlet 15, the other end of the third line 5-1 is communicated with the refrigerant inlet 13, one end of the fourth line 5-2 is communicated with the refrigerant outlet 14, and the other end of the fourth line 5-2 is communicated with the refrigerator liquid return port 16.
In particular, refrigerant in refrigerator 3 enters first heat exchanger 2 via third line 5-1 and returns to refrigerator 3 via fourth line 5-2.
Example 4
As shown in fig. 4, the storage system of clean fuel of the present invention includes a storage tank 1 for storing liquid clean fuel and a first heat exchanger 2 for absorbing heat of the liquid clean fuel, and a refrigerator 3 for supplying refrigerant to the first heat exchanger 2; a liquid clean fuel circulation pipeline 4 is connected between the storage tank 1 and the first heat exchanger 2, and a refrigerant circulation pipeline 5 is connected between the first heat exchanger 2 and the refrigerator 3.
In this embodiment, be provided with storage tank liquid outlet 6 and storage tank liquid return port 7 on the storage tank 1, storage tank liquid return port 7 is connected with the liquid device that returns that is located storage tank 1.
In the embodiment, the first heat exchanger 2 is provided with a liquid clean fuel inlet 11 and a liquid clean fuel outlet 12, and a refrigerant inlet 13 and a refrigerant outlet 14; the liquid clean fuel circulation pipeline 4 comprises a first pipeline 4-1 and a second pipeline 4-2, one end of the first pipeline 4-1 is communicated with a liquid outlet 6 of the storage tank, the other end of the first pipeline 4-1 is communicated with a liquid clean fuel inlet 11, one end of the second pipeline 4-2 is communicated with a liquid clean fuel outlet 12, and the other end of the second pipeline 4-2 is communicated with a liquid return port 7 of the storage tank.
In practical implementation, unlike the embodiment 3, as shown in fig. 4, the unloading system 19 is directly connected to the first pipeline 4-1 through the unloading pipeline 20, the unloaded liquid clean fuel enters the first heat exchanger 2, exchanges heat with the refrigerant, and is recycled to the storage tank 1, and the liquid clean fuel is not easily flashed.
Example 5
As shown in fig. 5, the storage system of clean fuel of the present invention includes a storage tank 1 for storing liquid clean fuel and a first heat exchanger 2 for absorbing heat of the liquid clean fuel, and a refrigerator 3 for supplying refrigerant to the first heat exchanger 2; a liquid clean fuel circulation pipeline 4 is connected between the storage tank 1 and the first heat exchanger 2, and a refrigerant circulation pipeline 5 is connected between the first heat exchanger 2 and the refrigerator 3.
In this embodiment, a second heat exchanger 18 is connected to the storage tank 1.
In specific implementation, as shown in fig. 5, a second heat exchanger 18 is disposed between the unloading system 19 and the storage tank 1, an unloading liquid clean fuel inlet 21 and an unloading liquid clean fuel outlet 22 are disposed on the second heat exchanger 18, the unloading pipeline 20 is communicated with the unloading liquid clean fuel inlet 21, the unloading liquid clean fuel outlet 22 is connected to the storage tank 1 through a fifth pipeline 23, and the liquid clean fuel in the storage tank 1 is used as a refrigerant in the second heat exchanger 18 to exchange heat with the unloading liquid clean fuel, i.e., the unloading liquid clean fuel is stopped immediately.
Example 6
The storage method of the clean fuel comprises the following steps:
step one, collecting the pressure value in the storage tank 1;
step two, when the collected pressure value exceeds a set value, the refrigerator 3 provides refrigerant for the first heat exchanger 2 through a refrigerant circulating pipeline 5, and the liquid clean fuel in the storage tank 1 enters the first heat exchanger 2 through a liquid clean fuel circulating pipeline 4;
step three, in the first heat exchanger 2, the refrigerant exchanges heat with liquid clean fuel, and the liquid clean fuel is subjected to supercooling treatment;
step four, the liquid clean fuel after the supercooling treatment is circulated back to the storage tank 1.
In the embodiment, the pressure value in the storage tank 1 is collected in real time, when the pressure value in the storage tank 1 exceeds a set value of 10kpa, the first heat exchanger 2 and the refrigerator 3 are started, the liquid clean fuel in the storage tank 1 enters the first heat exchanger 2 through the liquid clean fuel circulation pipeline 4, the refrigerator 3 provides refrigerant for the first heat exchanger 2 through the refrigerant circulation pipeline 5, and in the first heat exchanger 2, the refrigerant exchanges heat with the liquid clean fuel to perform supercooling treatment on the liquid clean fuel; meanwhile, the temperature of the liquid clean fuel after the supercooling treatment is collected, and when the temperature of the liquid clean fuel after the supercooling treatment is still higher than-160 ℃, the circulation of the refrigerant in the refrigerator 3 is accelerated, and the flow of the refrigerant is increased; when the pressure value in the storage tank 1 is lower than 3kpa, the first heat exchanger 2 and the refrigerator 3 are stopped.
Example 7
The storage method of the clean fuel comprises the following steps:
step one, collecting a temperature value in the storage tank 1;
step two, when the acquired temperature value exceeds a set value, the refrigerator 3 provides refrigerant for the first heat exchanger 2 through a refrigerant circulating pipeline 5, and the liquid clean fuel in the storage tank 1 enters the first heat exchanger 2 through a liquid clean fuel circulating pipeline 4;
step three, in the first heat exchanger 2, the refrigerant exchanges heat with liquid clean fuel, and the liquid clean fuel is subjected to supercooling treatment;
step four, the liquid clean fuel after the supercooling treatment is circulated back to the storage tank 1.
In the embodiment, the temperature value in the storage tank 1 is collected in real time, when the temperature value in the storage tank 1 exceeds a set value of-60 ℃, the first heat exchanger 2 and the refrigerator 3 are started, the liquid clean fuel in the storage tank 1 enters the first heat exchanger 2 through the liquid clean fuel circulating pipeline 4, the refrigerator 3 provides a refrigerant for the first heat exchanger 2 through the refrigerant circulating pipeline 5, and in the first heat exchanger 2, the refrigerant exchanges heat with the liquid clean fuel to perform supercooling treatment on the liquid clean fuel; meanwhile, the temperature of the liquid clean fuel after the supercooling treatment is collected, and when the temperature of the liquid clean fuel after the supercooling treatment is still higher than-160 ℃, the circulation of the refrigerant in the refrigerator 3 is accelerated, and the flow of the refrigerant is increased; when the collected temperature value in the storage tank 1 is lower than-70 ℃, the first heat exchanger 2 and the refrigerator 3 are stopped.
Example 8
The storage method of the clean fuel comprises the following steps:
step one, collecting a pressure value and a temperature value in the storage tank 1;
step two, when the collected pressure value exceeds a set value, the refrigerator 3 provides refrigerant for the first heat exchanger 2 through a refrigerant circulating pipeline 5, and the liquid clean fuel in the storage tank 1 enters the first heat exchanger 2 through a liquid clean fuel circulating pipeline 4;
step three, in the first heat exchanger 2, the refrigerant exchanges heat with liquid clean fuel, and the liquid clean fuel is subjected to supercooling treatment;
step four, the liquid clean fuel after the supercooling treatment is circulated back to the storage tank 1.
In the embodiment, the pressure value in the storage tank 1 is collected in real time, when the pressure value in the storage tank 1 exceeds a set value of 10kpa, the first heat exchanger 2 and the refrigerator 3 are started, the liquid clean fuel in the storage tank 1 enters the first heat exchanger 2 through the liquid clean fuel circulation pipeline 4, the refrigerator 3 provides refrigerant for the first heat exchanger 2 through the refrigerant circulation pipeline 5, and in the first heat exchanger 2, the refrigerant exchanges heat with the liquid clean fuel to perform supercooling treatment on the liquid clean fuel; meanwhile, the temperature of the liquid clean fuel after the supercooling treatment is collected, and when the temperature of the liquid clean fuel after the supercooling treatment is still higher than-160 ℃, the circulation of the refrigerant in the refrigerator 3 is accelerated, and the flow of the refrigerant is increased; when the collected pressure value in the storage tank 1 is lower than 3kpa and the collected temperature value in the storage tank 1 is lower than-70 ℃, the first heat exchanger 2 and the refrigerator 3 are stopped.
The storage system of the invention combines with the storage method, no BOG is generated, and the possibility of environmental pollution is avoided; the method is suitable for intermittent operation, and can meet the operation scene of peak regulation and non-peak regulation periods of the peak regulation station; compared with the BOG reliquefaction technology, the energy is saved by 40-50%, and the economic loss of small peak shaving enterprises caused by the fact that BOG cannot be recycled can be made up.
Specifically, the temperature at which BOG is generated is-140 ℃ as calculated as 9000kg/h, 12553Nm3/h and BOG generated in one day:
the amount of heat that the BOG generates needs to absorb is: qHeat generation＝cm2Δt+rm2(5.2X 106J) wherein c is the specific heat capacity of the medium, m2And delta t is the phase change medium mass, delta t is the phase change medium temperature change, and r is the phase change latent heat of the phase change medium.
When liquid nitrogen is adopted as a refrigerant, the phase change does not occur, the flow rate of the liquid nitrogen is required to be 21979kg/h, and the power of refrigeration equipment is required to be 21979/36-610 kW
If BOG is re-liquefied, phase change occurs, the BOG is compressed from normal pressure to user demand, for example, the user demand is 0.41Mpa, which is generally higher than that, the energy saving effect is better, the power of the compressor is about P-Q- Δ P, wherein P is the power Q as the medium flow, Δ P is the pressure difference,
p＝12553/3600*(0.41-0.1)*1000000＝1080952W＝1080Kw
energy saving calculation is about: (1081-610)/1080-0.4357-43.57%
The BOG reliquefaction needs to be transported by a compressor to a recondenser during which the compressor does work, the fuel consumption of the reliquefaction process will also be higher than that of the present invention, and the reliquefaction process is suitable for peak shaving periods with export, and in the case of non-peak shaving periods without export, there is no source of refrigeration for the reliquefaction. LNG absorption Q in storage tank 1 of the inventionHeat generationThen, the BOG is changed into a BOG, and in order to control the storage pressure of the reserve, the BOG can only be discharged after being generated, and the BOG is directly compressedThe formula is that the discharged BOG is compressed to the user end by the compressor to work and then is transmitted to the user after the pressure is needed. Therefore, compared with BOG reliquefaction, the invention has the advantages of energy consumption saving, simple process, simple equipment and small investment.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all simple modifications, changes and equivalent structural changes made to the above embodiment according to the technical spirit of the present invention still fall within the protection scope of the technical solution of the present invention.
Claims (10)
1. A clean fuel storage system, characterized by: comprises a storage tank (1) for storing liquid clean fuel, a first heat exchanger (2) for absorbing heat of the liquid clean fuel, and a refrigerator (3) for providing refrigerant for the first heat exchanger (2); a liquid clean fuel circulating pipeline (4) is connected between the storage tank (1) and the first heat exchanger (2), and a refrigerant circulating pipeline (5) is connected between the first heat exchanger (2) and the refrigerator (3).
2. A clean fuel storage system as claimed in claim 1, wherein: the storage tank (1) is provided with a storage tank liquid outlet (6) and a storage tank liquid return port (7), and the storage tank liquid return port (7) is connected with a liquid return device positioned in the storage tank (1).
3. A clean fuel storage system as claimed in claim 2, wherein: the liquid return device comprises a liquid return pipe (8), one end of the liquid return pipe (8) is communicated with the liquid return opening (7) of the storage tank, and the other end of the liquid return pipe (8) extends into the bottom in the storage tank (1).
4. A clean fuel storage system as claimed in claim 2, wherein: the liquid return device comprises a spray pipe (9) arranged at the inner top of the storage tank (1), the spray pipe (9) is communicated with the liquid return port (7) of the storage tank, and a plurality of spray heads (10) are arranged on the spray pipe (9).
5. A clean fuel storage system as claimed in claim 2, wherein: the first heat exchanger (2) is provided with a liquid clean fuel inlet (11), a liquid clean fuel outlet (12), a refrigerant inlet (13) and a refrigerant outlet (14); the liquid clean fuel circulating pipeline (4) comprises a first pipeline (4-1) and a second pipeline (4-2), one end of the first pipeline (4-1) is communicated with the storage tank liquid outlet (6), the other end of the first pipeline (4-1) is communicated with the liquid clean fuel inlet (11), one end of the second pipeline (4-2) is communicated with the liquid clean fuel outlet (12), and the other end of the second pipeline (4-2) is communicated with the storage tank liquid return port (7).
6. A clean fuel storage system as claimed in claim 5, wherein: the refrigerator (3) is provided with a refrigerator liquid outlet (15) and a refrigerator liquid return port (16), the refrigerant circulating pipeline (5) comprises a third pipeline (5-1) and a fourth pipeline (5-2), one end of the third pipeline (5-1) is communicated with the refrigerator liquid outlet (15), the other end of the third pipeline (5-1) is communicated with the refrigerant inlet (13), one end of the fourth pipeline (5-2) is communicated with the refrigerant outlet (14), and the other end of the fourth pipeline (5-2) is communicated with the refrigerator liquid return port (16).
7. A clean fuel storage system as claimed in claim 1, wherein: the storage tank (1) is connected with a second heat exchanger (18).
8. A method for storing clean fuel, using a storage system according to any one of claims 1 to 7, comprising the steps of:
step one, collecting storage parameters of liquid clean fuel in the storage tank (1);
step two, when the storage parameter exceeds a set value, the refrigerator (3) provides refrigerant for the first heat exchanger (2) through a refrigerant circulating pipeline (5), and liquid clean fuel in the storage tank (1) enters the first heat exchanger (2) through a liquid clean fuel circulating pipeline (4);
step three, in the first heat exchanger (2), the refrigerant exchanges heat with liquid clean fuel to perform supercooling treatment on the liquid clean fuel;
step four, the liquid clean fuel after the supercooling treatment is circulated back to the storage tank (1).
9. A clean fuel storage method as claimed in claim 8, wherein said storage parameters of the liquid clean fuel in step one include at least one of pressure and temperature in the storage tank.
10. A storage method of clean fuel according to claim 8, characterized in that, in the second step, the refrigerator (3) collects the temperature of the liquid clean fuel after the supercooling process and adjusts the flow rate of the refrigerant while supplying the refrigerant to the first heat exchanger (2) through the refrigerant circulation line (5).
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| CN202111669246.4A CN114321700A (en) | 2021-12-30 | 2021-12-30 | Storage system and storage method of clean fuel |
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| US20200056837A1 (en) * | 2017-02-14 | 2020-02-20 | L'Air Liquide, Société Anonyme pour l'Etude et l'Exploitation des Procédés Georges Claude | Lng production system equipped with recondenser |
| CN214840065U (en) * | 2021-06-08 | 2021-11-23 | 杭州宏盛中弘新能源有限公司 | Low-temperature liquid storage tank sprays pressure reduction means |
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| CN104390136A (en) * | 2014-11-11 | 2015-03-04 | 南京工业大学 | A method and device for recycling BOG |
| CN204852920U (en) * | 2015-08-26 | 2015-12-09 | 成都深冷科技有限公司 | A BOG condensate recovery system for LNG atmospheric storage tank |
| US20200056837A1 (en) * | 2017-02-14 | 2020-02-20 | L'Air Liquide, Société Anonyme pour l'Etude et l'Exploitation des Procédés Georges Claude | Lng production system equipped with recondenser |
| JP2019138329A (en) * | 2018-02-07 | 2019-08-22 | Ｊｆｅエンジニアリング株式会社 | Bog suppression method and device for low-temperature liquefied gas storage tank |
| CN214840065U (en) * | 2021-06-08 | 2021-11-23 | 杭州宏盛中弘新能源有限公司 | Low-temperature liquid storage tank sprays pressure reduction means |
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