CN209876501U - Large-scale water bath formula gasification system of LNG - Google Patents
Large-scale water bath formula gasification system of LNG Download PDFInfo
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- CN209876501U CN209876501U CN201920799907.7U CN201920799907U CN209876501U CN 209876501 U CN209876501 U CN 209876501U CN 201920799907 U CN201920799907 U CN 201920799907U CN 209876501 U CN209876501 U CN 209876501U
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Abstract
The utility model discloses a large LNG water bath type gasification system, which comprises a liquid heating water bath, a heat source gas injection and distribution device, an LNG gasification heating heat exchange tube bundle, a booster pump, a natural gas pipeline and a heat source gas connecting pipeline; a heat exchange liquid medium is contained in the liquid heating water bath; the gas inlet of the heat source gas injection and distribution device is communicated with the heat source gas connecting pipeline, and the gas outlet of the heat source gas injection and distribution device is positioned in the liquid heating water bath; the LNG gasification heating heat exchange tube bundle is arranged in the liquid heating water bath, one end of the LNG gasification heating heat exchange tube bundle is communicated with the booster pump, and the other end of the LNG gasification heating heat exchange tube bundle is communicated with the natural gas pipeline; the booster pump communicates with the LNG storage device. Utilize the utility model discloses can effectively reduce the required cost of LNG gasification.
Description
Technical Field
The utility model relates to a LNG gasification heating technology, concretely relates to utilize low temperature resistant organic water solution to realize heating gasification system to LNG as the water bath heat source.
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.
Another LNG vaporization heating method is a water bath heater, but the water temperature cannot be lower than zero, so the heating temperature range is limited, and thus a single water bath heater cannot realize the LNG vaporization heating function of a large LNG storage tank.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a large-scale water bath formula gasification system of new LNG, can realize utilizing liquid heat transfer medium and flue gas or hot-air heat to heat LNG, can effectively reduce the required cost of LNG gasification.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a large LNG water bath type gasification system comprises a liquid heating water bath, a heat source gas injection and distribution device, an LNG gasification heating heat exchange tube bundle, a booster pump, a natural gas pipeline and a heat source gas connecting pipeline; a heat exchange liquid medium is contained in the liquid heating water bath; the gas inlet of the heat source gas injection and distribution device is communicated with the heat source gas connecting pipeline, and the gas outlet of the heat source gas injection and distribution device is positioned in the liquid heating water bath; the LNG gasification heating heat exchange tube bundle is arranged in the liquid heating water bath, one end of the LNG gasification heating heat exchange tube bundle is communicated with the booster pump, and the other end of the LNG gasification heating heat exchange tube bundle is communicated with the natural gas pipeline; the booster pump communicates with the LNG storage device.
Furthermore, the system also comprises a gas-liquid separator, wherein the inlet of the gas-liquid separator is communicated with the other end of the LNG gasification heating heat exchange tube bundle, the liquid outlet of the gas-liquid separator is communicated with the booster pump, and the gas outlet of the gas-liquid separator is communicated with the natural gas pipeline.
Furthermore, the heat source gas injection and distribution device comprises a gas distribution pipe and heat source gas latent-injection nozzles, the gas distribution pipe is provided with a plurality of heat source gas outlets, the heat source gas outlets are uniformly distributed in the liquid heating water bath, and each heat source gas outlet is connected with a heat source gas latent-injection nozzle; and a gas inlet of the gas distribution pipe is communicated with the heat source gas connecting pipeline.
Further, each heat source gas outlet extends to the bottom of the liquid heating water bath.
Furthermore, the liquid heating water bath is also communicated with an exhaust pipe.
Furthermore, one end of the exhaust pipe is communicated with the liquid heating water bath, and the other end of the exhaust pipe is communicated with an exhaust treatment device.
Further, the heat exchange liquid medium is any one of water, ethylene glycol aqueous solution, ethanol aqueous solution, ionic liquid and liquid metal.
Further, the LNG gasification heating heat exchange tube bundle adopts a light pipe type heat exchange tube bundle or a finned heat exchange tube bundle.
The beneficial effects of the utility model reside in that:
1) the utility model can fully utilize the discharged flue gas of a gas boiler or a gas generator set, or fully utilize the air, and heat the LNG for gasification or improve the temperature of the natural gas through the liquid heating water bath, thereby effectively reducing the LNG gasification cost;
2) by selecting the heat exchange liquid medium with wide temperature range working characteristics, the problems of icing, liquid solidification under low temperature and the like of the heating tank can be avoided.
3) By selecting the heat exchange liquid medium with wide temperature range working characteristics, the heat exchange liquid medium can be ensured not to have a large amount of evaporation under the heat source gas immersion type jet heating condition.
4) Due to the fact that the immersed jet flow is large in heat exchange coefficient and high in heat exchange strength, efficient LNG gasification heating can be achieved;
5) the high equipment investment of utilizing seawater and the heat exchanger equipment containing titanium is avoided, and the limitation that a large LNG gasification facility must be built at the sea is also eliminated.
Drawings
Fig. 1 is a schematic diagram of a system structure according to 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 water bath type LNG gasification system, as shown in FIG. 1, which comprises a liquid heating water bath 1, a heat source gas injection and distribution device 2, an LNG gasification heating heat exchange tube bundle 3, a booster pump 4, a natural gas pipeline 5 and a heat source gas connecting pipeline 6; the liquid heating water bath 1 is filled with a heat exchange liquid medium 7; the gas inlet of the heat source gas injection and distribution device 2 is communicated with the heat source gas connecting pipeline 6, and the gas outlet is positioned in the liquid heating water bath 1; the LNG gasification heating heat exchange tube bundle 3 is arranged in the liquid heating water bath 1, one end of the LNG gasification heating heat exchange tube bundle is communicated with the booster pump 4, and the other end of the LNG gasification heating heat exchange tube bundle is communicated with the natural gas pipeline 5; and the booster pump 4 is communicated with the LNG storage device.
In this embodiment, the system further includes a gas-liquid separator 8, an inlet of the gas-liquid separator 8 is communicated with the other end of the LNG vaporization heating heat exchange tube bundle 3, a liquid outlet thereof is communicated with the booster pump 4, and a gas outlet thereof is communicated with the natural gas pipeline 5.
In this embodiment, the heat source gas injection and distribution device 2 includes a gas distribution pipe 21 and a heat source gas latent jet nozzle 22, the gas distribution pipe 21 has a plurality of heat source gas outlets, the heat source gas outlets are uniformly distributed in the liquid heating water bath 1, and each heat source gas outlet is connected with the heat source gas latent jet nozzle 22; the gas inlet of the gas distribution pipe 21 is communicated with the heat source gas connecting pipeline 6.
Further, in the present embodiment, each heat source gas outlet extends to the bottom inside the liquid heating water bath 1.
In the present embodiment, the liquid heating water bath 1 is also communicated with an exhaust pipe 9. The exhaust pipe 9 is used for exhausting the heat source gas and the heat exchange liquid medium out of the liquid heating water bath 1 after heat exchange.
Further, in the present embodiment, one end of the exhaust pipe 9 is connected to the liquid heating water bath 1, and the other end is connected to an exhaust gas treatment device 10.
Further, the heat exchange liquid medium 7 is any one of water, an ethylene glycol aqueous solution, an ethanol aqueous solution, an ionic liquid and a liquid metal.
The concentration range of the ethylene glycol aqueous solution is less than or equal to 80%, the maximum temperature of the heat source gas is not more than 38 ℃, and air is preferably used.
The concentration range of the ethanol aqueous solution is less than or equal to 90 percent, the maximum temperature of the heat source gas is not more than 38 ℃, and air is preferably used.
The ionic liquid is liquid in the temperature range of-50 ℃ to 100 ℃, and the heat source gas is preferably flue gas discharged after combustion of fuel gas.
The ionic liquid is also called room temperature ionic liquid, room temperature molten salt, organic ionic liquid and the like. Unlike typical organic solvents, ionic liquids generally do not become vapors, so harmful gases polluting the atmosphere are not generated in the chemical experiment process, and the use is convenient. In addition, the ionic liquid has no electroneutral molecules, 100 percent of the molecules are anions and cations, the ionic liquid is in a liquid state at the temperature of-100-200 ℃, and the ionic liquid has good thermal stability and electrical conductivity and allows kinetic control to a great extent. For most inorganic, organic and polymeric materials, ionic liquids are excellent solvents; the catalyst has acid and super-acid properties, so that the catalyst can be used as a solvent and also can be used as a catalyst for certain reactions, and the solvent with catalytic activity avoids the defects of additional possibly toxic catalysts or the possibility of generating a large amount of waste; the price is relatively cheap, most of ionic liquid has stability to water and is easy to prepare in a water phase; the ionic liquid also has excellent designability, and the ionic liquid with special functions can be obtained through molecular design. In a word, the ionic liquid has the advantages of no odor, no pollution, no flammability, easy separation from products, easy recovery, repeated and repeated recycling, convenient use and the like, is an ideal substitute of the traditional volatile solvent, effectively avoids the problems of serious environment, health, safety, equipment corrosion and the like caused by the use of the traditional organic solvent, and is a real and environment-friendly green solvent. Is suitable for the cleaning technology advocated at present and the requirement of sustainable development, and has been widely accepted and accepted by people.
The liquid metal is liquid in the temperature range of-50 ℃ to 100 ℃, and the heat source gas is preferably flue gas discharged after gas combustion. Liquid metal refers to an amorphous metal that can be viewed as a mixture of a positively ionic fluid and a free electron gas. Liquid metal is also an amorphous, flowable liquid metal that is non-toxic, non-volatile or non-evaporable.
The LNG gasification heating heat exchange tube bundle 3 adopts a light tube type heat exchange tube bundle or a finned heat exchange tube bundle.
In this embodiment, a drainage fan 11 is disposed on the heat source gas connecting pipeline 6. The flow guide fan 11 is used for guiding the heat source gas to the heat source gas connecting pipeline 6.
In the present embodiment, the liquid heating water bath 1 is provided with a liquid supplementing port 101 and a liquid discharging port 102, the liquid supplementing port 101 is used for supplementing the heat exchange liquid medium into the liquid heating water bath 1, and the liquid discharging port 102 is used for discharging the heat exchange liquid medium from the liquid heating water bath.
The working principle of the LNG large-scale water bath type gasification system is as follows:
heat source gas (smoke or air) with a certain flow is introduced into the liquid heating water bath through the heat source gas connecting pipe to heat the heat exchange liquid medium in the liquid heating water bath.
Starting a booster pump, and pumping LNG from the LNG storage device to the LNG gasification heating heat exchange tube bundle; LNG carries out the heat exchange through the heat transfer liquid medium that LNG gasification heating heat exchange tube bank and the heating in the liquid heating water bath, becomes the natural gas output to the natural gas pipeline after the heating gasification, outwards carries the natural gas.
In this embodiment, a gas-liquid separator is arranged in the system, the LNG is heated and gasified and then enters the gas-liquid separator, the gas-liquid separator separates the unvaporized LNG, the unvaporized LNG or the natural gas which does not reach the temperature requirement is sent into the LNG gasification heating heat exchange tube bundle again through the booster pump, and the natural gas which reaches the temperature requirement is sent into the natural gas pipeline.
And monitoring the temperature or concentration of the heat exchange liquid medium in the liquid heating water bath, and when the concentration is lower than a limit value, performing liquid supplementing and liquid discharging operations on the heat exchange liquid medium to keep the temperature or concentration of the heat exchange liquid medium in the liquid heating water bath in a normal working range.
Example 2
The present embodiment provides a method for designing the system according to embodiment 1, including the following steps:
and S1, calculating the heat exchange amount required by the LNG with the set flow rate according to the capacity of the LNG storage device, the flow rate of the booster pump and the required gas supply temperature of the final natural gas according to the following formula:
QLNG (liquefied Natural gas) assembly＝FLNG*QGasification of+FLNG*(TFor supplying to-TLNG)*Cp gas
QLNG (liquefied Natural gas) 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; fLNGAs a stream of LNGAmount, kg/h; 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 isLNGThe 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 convection heat transfer coefficient alpha of the air on the surface of the selected light tube type heat exchange tube or fin type heat exchange tube0；
S4, inquiring the average heat exchange coefficient alpha of the whole process of heating, gasifying and overheating in the selected light tube type heat exchange tube or fin type heat exchange tube in the process from LNG liquid phase to gas phase gasifyingi；
QGasification of＝K0A0△tm＝KfAf△tm (2)
Wherein 1/K0＝1/α0+1/αi；Kf＝BK0(ii) a Delta tm is a logarithmic mean temperature difference, and is determined by the LNG gasification temperature in the light pipe type heat exchange tube or the fin type heat exchange tube and the air temperature outside the light pipe type heat exchange tube or the fin 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 heat exchange tube by utilizing the heat exchange coefficient of the light tube type heat exchange tube and calculating the heat exchange coefficient of the finned heat exchange tube by utilizing the heat exchange coefficient of the finned heat exchange tube and the heat conductivity 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 heat exchange tube bundle;
s5, obtaining a jet flow heat exchange coefficient K according to the type of the heat exchange liquid medium and the type of the heat source gasShooting deviceThen the heat exchange quantity Q of jet flowShooting deviceThe heat exchange quantity Q with LNG gasificationGasification ofHeat quantity Q of heat absorption for temperature rise of heat exchange liquid mediumLiquid for treating urinary tract infectionThe sum is approximately equal:
Qshooting device＝FHot gas*KShooting device*(TShooting device-TRow board)＝QLiquid for treating urinary tract infection+QLNG (liquefied Natural gas) assembly
＝MLiquid for treating urinary tract infection*CLiquid p(T1-T0)+FLNG*QGasification of+FLNG*(TFor supplying to-TLNG)*Cp gas；
TShooting deviceIs the incident temperature, T, of the heat source gasRow boardIs the exhaust temperature of the heat source gas, MLiquid for treating urinary tract infectionIs the mass of the heat-exchanging liquid medium, CLiquid pIs the specific heat capacity of the heat-exchanging liquid medium, T0And T1Respectively are temperature values before and after heat exchange of the heat exchange liquid medium;
thus, it is possible to obtain:
Fhot gas*KShooting device*(TShooting device-TRow board)＝MLiquid for treating urinary tract infection*CLiquid p(T1-T0)+FLNG*K0A0△tm+FLNG*(TFor supplying to-TLNG)*Cp gas (3)；
S6 LNG flow F needing to be gasifiedLNGTemperature T of externally supplied natural gasFor supplying toAnd temperature T after vaporization of LNGLNGThe incident temperature T of the heat source gas is known and known according to the type of the heat source gasShooting deviceAnd exhaust temperature TRow boardThe mass M of the heat-exchange liquid medium can be known according to the type of the heat-exchange liquid mediumLiquid for treating urinary tract infectionSpecific heat capacity CLiquid pTemperature value T before heat exchange0And temperature value T after heat exchange1Combined with jet heat transfer coefficient KShooting deviceAnd the heat exchange coefficient K of the LNG gasification heating heat exchange tube bundle0Heat exchange area A of heat exchange tube0The flow F of the heat source gas to be injected into the liquid heating water bath can be calculated by using the formula (3)Hot gasAnd LNG gasification heating heat exchange tube bundles with corresponding heat exchange areas can be selected and arranged in the liquid heating water bath according to different heat source gas flow designs.
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 (8)
1. The large LNG water bath type gasification system is characterized by comprising a liquid heating water bath, a heat source gas injection and distribution device, an LNG gasification heating heat exchange tube bundle, a booster pump, a natural gas pipeline and a heat source gas connecting pipeline; a heat exchange liquid medium is contained in the liquid heating water bath; the gas inlet of the heat source gas injection and distribution device is communicated with the heat source gas connecting pipeline, and the gas outlet of the heat source gas injection and distribution device is positioned in the liquid heating water bath; the LNG gasification heating heat exchange tube bundle is arranged in the liquid heating water bath, one end of the LNG gasification heating heat exchange tube bundle is communicated with the booster pump, and the other end of the LNG gasification heating heat exchange tube bundle is communicated with the natural gas pipeline; the booster pump communicates with the LNG storage device.
2. The large-scale LNG water-bath type gasification system of claim 1, further comprising a gas-liquid separator, wherein an inlet of the gas-liquid separator is communicated with the other end of the LNG gasification heating heat exchange tube bundle, a liquid outlet of the gas-liquid separator is communicated with the booster pump, and a gas outlet of the gas-liquid separator is communicated with the natural gas pipeline.
3. The large-scale LNG water-bath gasification system according to claim 1, wherein the heat source gas injection and distribution device comprises a gas distribution pipe and heat source gas submerged nozzles, the gas distribution pipe has a plurality of heat source gas outlets, each of the heat source gas outlets is uniformly distributed in the liquid heating water bath, and each of the heat source gas outlets is connected with a heat source gas submerged nozzle; and a gas inlet of the gas distribution pipe is communicated with the heat source gas connecting pipeline.
4. A large LNG water bath gasification system according to claim 3, wherein each heat source gas outlet extends to the bottom of the liquid heating water bath.
5. The large-scale LNG water bath type gasification system according to claim 1, wherein the liquid heating water bath is further communicated with an exhaust pipe.
6. The large-scale LNG water bath type gasification system according to claim 5, wherein one end of the exhaust pipe is connected to the liquid heating water bath, and the other end of the exhaust pipe is connected to an exhaust gas treatment device.
7. The large-scale LNG water bath type gasification system according to claim 1, wherein the heat exchange liquid medium is any one of water, glycol water solution, ethanol water solution, ionic liquid and liquid metal.
8. The large-scale water-bath type LNG gasification system of claim 1, wherein the LNG gasification heating heat exchange tube bundle is a light tube type heat exchange tube bundle or a finned heat exchange tube bundle.
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| CN116651533A (en) * | 2023-05-26 | 2023-08-29 | 苏建桦 | Composition for increasing telomere length and method for preparing the same |
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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. |
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