CN210266702U - Large-scale LNG and air direct heat exchange gasification system - Google Patents
Large-scale LNG and air direct heat exchange gasification system Download PDFInfo
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- CN210266702U CN210266702U CN201920666796.2U CN201920666796U CN210266702U CN 210266702 U CN210266702 U CN 210266702U CN 201920666796 U CN201920666796 U CN 201920666796U CN 210266702 U CN210266702 U CN 210266702U
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Abstract
The utility model discloses a large-scale LNG and air direct heat transfer gasification system, the system mainly includes LNG storage device, booster pump, air heat exchanger, gas collecting device, hot-air conveyer, 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 the direct 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 the titanium metal tubular product expensive, avoided utilizing the sea water temperature change that the sea water heating caused, accomplish LNG gasification and natural gas intensification heating, avoided original gas heater's high fuel cost and operation maintenance cost with high price/performance ratio.
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 the direct 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 direct heat exchange gasification system, which comprises an LNG storage device, a booster pump, an air heat exchanger, a gas collecting device, an air conveying device and a natural gas pipeline; the LNG storage device is communicated with an inlet of the air heat exchanger through a booster pump, an inlet of the gas collecting device is communicated with an outlet of the air heat exchanger, and an outlet of the gas collecting device is communicated with the natural gas pipeline; 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 hot-air, air conveying device will carry to the surface of air exchanger through the hot-air that the air dehumidification unit precooled the dehumidification.
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, and each liquid phase distribution pipe is communicated with the booster pump.
Further, the air delivery device includes a blower.
Further, the air heat exchanger and the air dehumidification unit both adopt a light tube type heat exchange tube bundle or a finned tube type heat exchange tube bundle.
The beneficial effects of the utility model reside in that:
1) the air heat exchanger is used for directly 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.
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 LNG and air direct heat exchange gasification system, as shown in fig. 1, which includes an LNG storage device 1, a booster pump 2, an air heat exchanger 3, a gas collecting device 4, an air conveying device 5, and a natural gas pipeline 6; the LNG storage device 1 is communicated with an inlet of the air heat exchanger 3 through a booster pump 2, an inlet of the gas collecting device 4 is communicated with an outlet of the air heat exchanger 3, and an outlet of the gas collecting device is communicated with the natural gas pipeline 6; the air delivery device 5 is used to deliver hot air to the surface of the air heat exchanger 3.
In this embodiment, be equipped with air dehumidification unit 7 on the natural gas line 6, the import and the export of air dehumidification unit 7 are linked together with natural gas line 6 respectively for carry out the precooling dehumidification to hot-air, air conveyor 5 will carry to the surface of air exchanger 3 through the hot-air of 7 precooling dehumidifications of air dehumidification unit. The air dehumidification unit is adopted to dehumidify the hot air in advance, so that the influence of icing of moisture in the hot air on the air heat exchanger 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 conventional gas heater are avoided.
In the present embodiment, the air delivery device 5 comprises a fan.
In the present embodiment, the system is provided with a plurality of air heat exchangers 3, the inlet of each air heat exchanger 3 is respectively communicated with a liquid phase distribution pipe 8, and each liquid phase distribution pipe 8 is communicated with the booster pump 2.
In this embodiment, the air heat exchanger 3 and the air dehumidifying unit 7 are fin-tube heat exchanger bundles.
Specifically, the air heat exchanger 3 may employ 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 material are formed by one-time machining from the same metal material and can withstand the ultra-low temperature of the LNG liquid natural gas.
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 is as follows:
the LNG is pumped out from the LNG storage device to be pressurized by the booster pump, and then is sent to the liquid-phase distribution pipe, the LNG is uniformly distributed to enter the air heat exchanger to exchange heat with hot air on the surface of the air heat exchanger, the LNG is heated by the hot air to be boiled to be completely gasified into low-temperature natural gas, even enters an overheat state, and then enters the gas collection device to be supplied with natural gas through a natural gas pipeline.
In this embodiment, the natural gas pipeline is provided with an air dehumidifying unit, and the low-temperature natural gas can flow through the air dehumidifying unit. The external hot air firstly passes through the air dehumidification unit, the hot air exchanges heat with low-temperature natural gas in the air dehumidification unit, the low-temperature natural gas absorbs heat in the hot air and then is conveyed continuously through a natural gas pipeline and supplied to the outside, water vapor in the hot air is cooled and condensed on the surface of the air dehumidification unit and discharged, the precooled hot air is conveyed to the outer surface of the air heat exchange device through the air conveying device, the heat exchange is carried out between the outer surface of the air heat exchange device and LNG in the air heat exchange device, the LNG in the air heat exchange device absorbs the heat of the hot air and is gasified into the low-temperature natural gas, and the cooled air is discharged into the atmosphere.
In this embodiment, the system is provided with a plurality of air heat exchangers, and the liquefied natural gas LNG is pumped out of the LNG storage device by the booster pump and then introduced into the respective liquid-phase distribution pipes, and the respective liquid-phase distribution pipes distribute the liquefied natural gas LNG into the respective air heat exchangers to exchange heat with air outside the air heat exchangers.
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; q gasification is the energy required by LNG gasification, kJ/h; q, heating up to the energy required by heating up the gaseous natural gas to the gas supply temperature, kJ/h; fLNGThe LNG flow is kg/h; qLNG latent heat is LNG vaporization latent heat, 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 the design manual of the heat exchanger to obtain the convective heat transfer coefficient α of the air on the surface of the selected light tube type heat exchange tube or fin tube type heat exchange tube0；
S4, inquiring the average heat exchange coefficient α of the whole process of temperature rise, gasification and overheating in the selected light tube type heat exchange tube or fin tube type heat exchange tube in the process from LNG liquid phase to gas phase gasificationi；
QGasification of＝K0A0△tm＝KfAf△tm (2)
Wherein 1/K0＝1/α0+1/αi；Kf＝BK0△ tm is logarithmic mean temperature difference determined by LNG gasification temperature in light pipe type heat exchange tube or finned tube type heat exchange tube and air temperature outside light pipe type heat exchange tube or finned tube type heat exchange tube, K0Heat transfer coefficient of light pipe type heat exchange tube, KfThe correction coefficient is obtained by calculating the heat exchange coefficient of the finned tube type heat exchange tube by utilizing the heat exchange coefficient of the finned tube type heat exchange tube and calculating the heat exchange coefficient of the inner and outer finned tube type heat exchange tubes and the heat conduction coefficient of the tube wall; a. the0Is the total internal surface area of the light pipe type heat exchange tube bundle, AfThe total external surface area of the finned tube type heat exchange tube bundle;
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 direct 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 direct heat exchange gasification system is characterized by comprising an LNG storage device, a booster pump, an air heat exchanger, a gas collecting device, an air conveying device and a natural gas pipeline; the LNG storage device is communicated with an inlet of the air heat exchanger through a booster pump, an inlet of the gas collecting device is communicated with an outlet of the air heat exchanger, and an outlet of the gas collecting device is communicated with the natural gas pipeline; the air delivery device is used for delivering air to the surface of the air heat exchanger.
2. The large-scale direct 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 the hot air, and the air delivering device delivers the hot air pre-cooled and dehumidified by the air dehumidifying unit to a surface of the air exchanger.
3. The large-scale direct heat exchange gasification system for LNG and air as claimed in 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, and each liquid phase distribution pipe is communicated with the booster pump.
4. The large LNG direct heat exchange gasification system according to claim 1, wherein the air transfer device comprises a fan.
5. The large scale LNG and air direct heat exchange gasification system according to claim 1, wherein the air heat exchanger and the air dehumidification unit both employ a light pipe heat exchange tube bundle or a finned pipe heat exchange tube bundle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920666796.2U CN210266702U (en) | 2019-05-10 | 2019-05-10 | Large-scale LNG and air direct heat exchange gasification system |
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|---|---|---|---|
| CN201920666796.2U CN210266702U (en) | 2019-05-10 | 2019-05-10 | Large-scale LNG and air direct heat exchange gasification system |
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| CN210266702U true CN210266702U (en) | 2020-04-07 |
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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. |