CN209762712U - Large-scale LNG and air indirect heat exchange gasification system - Google Patents
Large-scale LNG and air indirect heat exchange gasification system Download PDFInfo
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- CN209762712U CN209762712U CN201920666713.XU CN201920666713U CN209762712U CN 209762712 U CN209762712 U CN 209762712U CN 201920666713 U CN201920666713 U CN 201920666713U CN 209762712 U CN209762712 U CN 209762712U
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Abstract
the utility model discloses a large-scale LNG and air indirect heat transfer gasification system, the system mainly includes LNG storage device, booster pump, air heat exchanger, gas collecting device, air conveyor, natural gas pipeline, LNG gasification heat transfer unit and intermediate medium gas-liquid circulation heat transfer unit. The utility model discloses utilize air heat exchanger to come indirect heating LNG to promote the natural gas temperature, reduced heat exchanger manufacturing cost, reduced the influence to the environment, avoided original sea water heat exchanger to require titanium metal tubular product expensive, avoided utilizing sea water heating to cause sea water temperature variation, high price/performance ratio ground to accomplish LNG gasification and natural gas heating up, avoided original gas heater's high fuel cost and operation maintenance cost.
Description
Technical Field
The utility model relates to a LNG gasification heating technology field, concretely relates to utilize large-scale air heating tower to heat LNG and realize gasified system.
Background
According to the medium and long term development and planning of energy in China, natural gas becomes one of bright spots and green energy pillars of the energy development strategy in China. In the future, China will import a large amount of natural gas, and most of the natural gas is transported to China in a Liquefied Natural Gas (LNG) mode. A large amount of imported LNG simultaneously carries a large amount of cold energy, and the gasification of LNG mainly relies on sea water heat transfer heating gasification at present.
The biggest problem of seawater heat exchangers and seawater pipelines is that special metal materials are needed, the manufacturing cost of the pipes and the heat exchanger plates is high, and the pipes or the plates containing titanium are generally adopted to avoid the corrosion of chlorine ions in seawater to metals. If a heat exchange system which can realize LNG heating and gasification without seawater can be found, the whole equipment cost of the LNG seawater heat exchange system is greatly reduced.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a large-scale LNG and indirect heat transfer gasification system of air, can effectively reduce the cost of LNG gasification.
in order to achieve the above purpose, the utility model adopts the following technical scheme:
The utility model provides a large LNG and air indirect heat exchange gasification system, which comprises an LNG storage device, a booster pump, an air conveying device, an LNG gasification heat exchange unit and an intermediate medium gas-liquid circulation heat exchange unit;
The LNG gasification heat exchange unit comprises a gas-liquid storage header, an LNG gasification heat exchange pipe and a natural gas pipeline, wherein an inlet and an outlet of the LNG gasification heat exchange pipe are respectively communicated with a liquid outlet and a gas inlet of the gas-liquid storage header; an inlet of the natural gas pipeline is communicated with a gas outlet of the gas-liquid storage header; a liquid inlet of the gas-liquid storage header is communicated with the LNG storage device through a booster pump;
the intermediate medium gas-liquid circulation heat exchange unit comprises an air heat exchanger, a gas collecting device, a liquid collecting pipe and an intermediate medium circulating pump, wherein the inlet of the liquid collecting pipe is communicated with the outlet of the gas collecting device, the outlet of the liquid collecting pipe is communicated with the inlet of the air heat exchanger through the intermediate medium circulating pump, and the outlet of the air heat exchanger is communicated with the inlet of the gas collecting device; the LNG gasification heat exchange tube is arranged in the gas collecting device;
The air delivery device is used for delivering air to the surface of the air heat exchanger.
Further, be equipped with the air dehumidification unit on the natural gas line, the import and the export of air dehumidification unit are linked together with natural gas line respectively for carry out the precooling dehumidification to the air, air transportation device will carry to the surface of air exchanger through the air of the precooling dehumidification of air dehumidification unit.
Furthermore, the system is provided with a plurality of air heat exchangers, the inlet of each air heat exchanger is respectively communicated with a liquid phase distribution pipe, each liquid phase distribution pipe is respectively communicated with an intermediate medium circulating pump, and all the intermediate medium circulating pumps are communicated with the outlets of the liquid collecting pipes.
Further, the air delivery device includes a blower.
furthermore, the air heat exchanger, the LNG gasification heat exchange tube and the air dehumidification unit all adopt a light tube type heat exchange tube bundle or a fin tube type heat exchange tube bundle.
The beneficial effects of the utility model reside in that:
1) the air heat exchanger is used for indirectly heating LNG, the temperature of natural gas is raised, the manufacturing cost of the heat exchanger is reduced, and the influence on the environment is reduced.
2) the high cost of the prior seawater heat exchanger requiring titanium metal pipes is avoided.
3) The temperature change of the seawater caused by heating by utilizing the seawater is avoided.
4) LNG gasification and natural gas heating are completed at high cost performance;
5) The high fuel cost and the operation and maintenance cost of the original fuel gas heater are avoided.
Drawings
Fig. 1 is a schematic diagram of a system structure according to embodiment 1 of the present invention;
Fig. 2 is a schematic view of an integrated finned heat exchange tube (horizontal fin) in embodiment 1 of the present invention;
fig. 3 is a schematic view of an integrated finned heat exchange tube (longitudinal fin) in embodiment 1 of the present invention;
Fig. 4 is a schematic view of an air dehumidifying unit (rectangular fin) in embodiment 1 of the present invention;
fig. 5 is a schematic view of an air dehumidifying unit (round fin) in embodiment 1 of the present invention.
In the figure, the LNG storage device 1, the booster pump 2, the air heat exchanger 3, the gas collecting device 4, the air conveying device 5, the natural gas pipeline 6, the air dehumidifying unit 7, the liquid phase distribution pipe 8, the gas-liquid storage header 9, the LNG gasification heat exchange pipe 10, the liquid collecting pipe 11 and the intermediate medium circulating pump 12 are shown.
Detailed Description
The present invention will be further described with reference to the accompanying drawings, and it should be noted that the present embodiment is based on the technical solution, and the detailed embodiments and the specific operation processes are provided, but the protection scope of the present invention is not limited to the present embodiment.
Example 1
the embodiment provides a large-scale air heat exchange and gasification system of LNG, as shown in FIG. 1, which comprises an LNG storage device 1, a booster pump 2, an air conveying device 5, an LNG gasification heat exchange unit and an intermediate medium gas-liquid circulation heat exchange unit;
The LNG gasification heat exchange unit comprises a gas-liquid storage header 9, an LNG gasification heat exchange tube 10 and a natural gas pipeline 6, wherein an inlet and an outlet of the LNG gasification heat exchange tube 10 are respectively communicated with a liquid outlet and a gas inlet of the gas-liquid storage header 9; the inlet of the natural gas pipeline 6 is communicated with the gas outlet of the gas-liquid storage header 9; a liquid inlet of the gas-liquid storage header 9 is communicated with the LNG storage device 1 through a booster pump 2;
The intermediate medium gas-liquid circulation heat exchange unit comprises an air heat exchanger 3, a gas collecting device 4, a liquid collecting pipe 11 and an intermediate medium circulating pump 12, wherein the inlet of the liquid collecting pipe 11 is communicated with the outlet of the gas collecting device 4, the outlet of the liquid collecting pipe 11 is communicated with the inlet of the air heat exchanger 3 through the intermediate medium circulating pump 12, and the outlet of the air heat exchanger 3 is communicated with the inlet of the gas collecting device 4; the LNG gasification heat exchange tube 10 is at least partially arranged in the gas collecting device 4;
The air delivery device 5 is used to deliver air to the surface of the air heat exchanger 3.
In this embodiment, the natural gas pipeline 6 is provided with an air dehumidifying unit 7, an inlet and an outlet of the air dehumidifying unit 7 are respectively communicated with the natural gas pipeline 6 for precooling and dehumidifying air, and the air conveying device 5 conveys the air precooled and dehumidified by the air dehumidifying unit 7 to the surface of the air exchanger 3. The air dehumidification unit is adopted to dehumidify the air in advance, so that the influence of moisture in the air on the air heat exchanger due to icing can be prevented, the temperature of the output natural gas is increased, and the high fuel cost and the operation and maintenance cost of the original gas heater are avoided.
In the present embodiment, the air delivery device 5 comprises a fan.
In this embodiment, the system is provided with a plurality of air heat exchangers 3, an inlet of each air heat exchanger 3 is respectively communicated with a liquid phase distribution pipe 8, each liquid phase distribution pipe 8 is respectively communicated with an intermediate medium circulating pump 12, and all the intermediate medium circulating pumps 12 are communicated with an outlet of the liquid collecting pipe 11.
In this embodiment, the air heat exchanger 3, the LNG vaporization heat exchange pipe 10 and the air dehumidification unit 7 all adopt finned pipe type heat exchange pipe bundles.
Specifically, the air heat exchanger 3 and the LNG vaporization heat exchange tube 10 may adopt an integrated finned heat exchange tube, wherein the integrated finned heat exchange tube includes two types, i.e., a transverse fin (as shown in fig. 2) and a longitudinal fin (as shown in fig. 3), and the fin material and the tube are formed by one-time machining using the same metal material, and can withstand the ultra-low temperature of LNG or low-temperature working medium.
The air dehumidifying unit 7 can adopt a finned tube type heat exchange tube as shown in fig. 4 or fig. 5, the materials of the fin and the light tube are different, and the fin can be round or rectangular, so that the air dehumidifying unit is suitable for the air dehumidifying unit with relatively high temperature for exchanging heat between low-temperature gaseous natural gas and air.
The working principle of the system of the embodiment is as follows: the LNG in the gas-liquid storage header enters the LNG gasification heat exchange tube, the LNG in the gas collection device exchanges heat with the intermediate medium in the gas state in the gas collection device through the LNG gasification heat exchange tube, the LNG is heated and gasified by the intermediate medium to form low-temperature natural gas, and the low-temperature natural gas returns to the gas-liquid storage header again, and enters the natural gas pipeline to be output outwards.
The intermediate medium after heat exchange with the LNG is in a liquid state and enters the liquid collecting pipe through the gas collecting device, the intermediate medium circulating pump pumps the liquid intermediate medium into the air heat exchanger to exchange heat with air, the intermediate medium is heated and boiled to be completely vaporized, even the intermediate medium which is changed into a gas state again after entering an overheat state enters the gas collecting device, and the intermediate medium continuously exchanges heat with the LNG in the LNG gasification heat exchange pipe. The above process is performed circularly.
In this embodiment, an air dehumidifying unit is disposed in the natural gas pipeline, and the low-temperature natural gas flows through the air dehumidifying unit. The external air firstly passes through the air dehumidification unit, the air exchanges heat with the low-temperature natural gas in the air dehumidification unit, the low-temperature natural gas is conveyed and supplied to the outside continuously through a natural gas pipeline after absorbing heat in the air, water vapor in the air is cooled and condensed on the surface of the air dehumidification unit and discharged, the pre-cooled air is conveyed to the outer surface of the air heat exchange device through the air conveying device, heat exchange is carried out between the outer surface of the air heat exchange device and a liquid intermediate medium in the air heat exchange device, the liquid intermediate medium in the air heat exchange device absorbs the heat of the air and is gasified into a gaseous intermediate medium, and the cooled air is discharged into the atmosphere.
The air dehumidification unit is adopted to dehumidify the air in advance, so that the influence of moisture in the air on the air heat exchanger due to icing can be prevented, the temperature of the output natural gas is increased, and the high fuel cost and the operation and maintenance cost of the original gas heater are avoided.
In this embodiment, the system is provided with a plurality of air heat exchangers, the intermediate medium circulating pump pumps the liquid intermediate medium into each liquid phase distribution pipe, and the liquid phase distribution pipe distributes the liquid intermediate medium into each air heat exchanger to exchange heat with air outside the air heat exchanger.
Example 2
The present embodiment provides a method for designing a system as described in embodiment 1, which specifically includes:
S1, calculating the heat exchange quantity required by the LNG with the set flow rate according to the capacity of the LNG storage device, the flow rate of the LNG booster pump and the required gas supply temperature of the final natural gas, wherein the heat exchange quantity comprises the LNG gasification heat exchange quantity, and the heat exchange quantity comprises the following formula:
QGeneral assembly＝QGasification of+Qtemperature rise＝FLNG*qLatent heat of LNG+FLNG*(TFor supplying to-T1)*Cp gas (1)；
QGeneral assemblyThe total energy required for LNG gasification and reaching the gas supply temperature is kJ/h; qGasification ofkJ/h is the energy required by LNG gasification; qTemperature risethe energy required for heating the gaseous natural gas to the gas supply temperature is kJ/h; fLNGThe LNG flow is kg/h; q. q.sLatent heat of LNGis the vaporization latent heat of LNG, kJ/kg; cp gasThe specific heat capacity of natural gas is kJ/kg ℃; t isFor supplying tothe temperature of the externally supplied natural gas is DEG C; t is1The temperature after LNG vaporization is DEG C;
s2, according to the type of the selected heat exchange tube, inquiring a heat exchanger design manual to obtain the convective heat transfer coefficient alpha 0 of the air on the surface of the selected light tube type heat exchange tube or fin tube type heat exchange tube;
S4, inquiring the average heat exchange coefficient alpha i of the whole process of temperature rise, gasification and overheating in the selected light pipe type heat exchange tube or fin tube type heat exchange tube in the process from LNG liquid phase to gas phase gasification;
QGasification of＝K0A0△tm＝KfAf△tm (2)
The heat exchanger comprises a shell, a light pipe type heat exchange tube, a fin pipe type heat exchange tube, a shell and a shell, wherein 1/K 0 is 1/alpha 0 + 1/alpha i, K f is BK 0, delta tm is logarithmic mean temperature difference and is determined by LNG gasification temperature in the light pipe type heat exchange tube or the fin pipe type heat exchange tube and air temperature outside the light pipe type heat exchange tube or the fin pipe type heat exchange tube, K 0 is heat exchange coefficient of the light pipe type heat exchange tube, K f is heat exchange coefficient of the fin pipe type heat exchange tube, B is correction coefficient for calculating heat exchange coefficient of the fin pipe type heat exchange tube by using heat exchange coefficient of the fin pipe;
Substituting the formula (2) into the formula (1) to obtain a formula for calculating the total internal surface area of the light tube type heat exchange tube bundle or the fin tube type heat exchange tube bundle and the total external surface area of the fin tube type heat exchange tube bundle, and after calculating the total internal surface area of the light tube type heat exchange tube bundle or the fin tube type heat exchange tube bundle and the total external surface area of the fin tube type heat exchange tube bundle, distributing the calculated total internal surface area and the total external surface area to each fin heat exchange tube to finish the design calculation of the heat exchanger;
S5, manufacturing a light pipe type heat exchange tube bundle or a finned tube type heat exchange tube bundle according to the design calculation result obtained in the step S4;
And S6, completing the integral installation, connection and test operation of the large LNG and air indirect heat exchange gasification system.
Various corresponding changes and modifications can be made by those skilled in the art according to the above technical solutions and concepts, and all such changes and modifications should be included in the protection scope of the present invention.
Claims (5)
1. a large LNG and air indirect heat exchange gasification system is characterized by comprising an LNG storage device, a booster pump, an air conveying device, an LNG gasification heat exchange unit and an intermediate medium gas-liquid circulation heat exchange unit;
The LNG gasification heat exchange unit comprises a gas-liquid storage header, an LNG gasification heat exchange pipe and a natural gas pipeline, wherein an inlet and an outlet of the LNG gasification heat exchange pipe are respectively communicated with a liquid outlet and a gas inlet of the gas-liquid storage header; an inlet of the natural gas pipeline is communicated with a gas outlet of the gas-liquid storage header; a liquid inlet of the gas-liquid storage header is communicated with the LNG storage device through a booster pump;
The intermediate medium gas-liquid circulation heat exchange unit comprises an air heat exchanger, a gas collecting device, a liquid collecting pipe and an intermediate medium circulating pump, wherein the inlet of the liquid collecting pipe is communicated with the outlet of the gas collecting device, the outlet of the liquid collecting pipe is communicated with the inlet of the air heat exchanger through the intermediate medium circulating pump, and the outlet of the air heat exchanger is communicated with the inlet of the gas collecting device; the LNG gasification heat exchange tube is arranged in the gas collecting device;
The air delivery device is used for delivering air to the surface of the air heat exchanger.
2. The large-scale indirect heat exchange gasification system for LNG and air as claimed in claim 1, wherein an air dehumidifying unit is disposed on the natural gas pipeline, an inlet and an outlet of the air dehumidifying unit are respectively communicated with the natural gas pipeline for pre-cooling and dehumidifying air, and the air delivering device delivers the air pre-cooled and dehumidified by the air dehumidifying unit to a surface of the air exchanger.
3. the large-scale LNG and air indirect heat exchange gasification system according to claim 1, wherein a plurality of air heat exchangers are provided, an inlet of each air heat exchanger is respectively communicated with a liquid phase distribution pipe, each liquid phase distribution pipe is respectively communicated with an intermediate medium circulating pump, and all the intermediate medium circulating pumps are communicated with an outlet of the liquid collection pipe.
4. the large scale indirect heat exchange LNG and air gasification system of claim 1, wherein the air transfer device comprises a fan.
5. the large-scale indirect heat exchange LNG and air gasification system of claim 1, wherein the air heat exchanger, the LNG gasification heat exchange tube and the air dehumidification unit all use a light tube type heat exchange tube bundle or a finned tube type heat exchange tube bundle.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920666713.XU CN209762712U (en) | 2019-05-10 | 2019-05-10 | Large-scale LNG and air indirect heat exchange gasification system |
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| CN201920666713.XU CN209762712U (en) | 2019-05-10 | 2019-05-10 | Large-scale LNG and air indirect heat exchange gasification system |
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Address after: 100176 Beijing City, Daxing District branch of Beijing economic and Technological Development Zone, thirteen street, 18 Hospital No. 12 Building 2 Room 201 Patentee after: HEPP Energy Environment Technology Co.,Ltd. Address before: 100176 building 12, 18 Chuang thirteen street, Beijing economic and Technological Development Zone, Daxing District, Beijing. Patentee before: Hep Energy and Environment Technology Co.,Ltd. |