CN110645825A - LNG gasifier water spraying system and control method - Google Patents

LNG gasifier water spraying system and control method Download PDF

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Publication number
CN110645825A
CN110645825A CN201910902307.3A CN201910902307A CN110645825A CN 110645825 A CN110645825 A CN 110645825A CN 201910902307 A CN201910902307 A CN 201910902307A CN 110645825 A CN110645825 A CN 110645825A
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China
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water
liquid level
circulating water
set value
heat exchange
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CN201910902307.3A
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Chinese (zh)
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CN110645825B (en
Inventor
吴俊铿
梁锦秀
虢德鹤
何丹
林土志
莫嘉杰
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ZHANJIANG ENN GAS CO Ltd
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ZHANJIANG ENN GAS CO Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F17/00—Removing ice or water from heat-exchange apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D1/04—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits
    • F28D1/047—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being bent, e.g. in a serpentine or zig-zag
    • F28D1/0477—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being bent, e.g. in a serpentine or zig-zag the conduits being bent in a serpentine or zig-zag
    • F28D1/0478—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being bent, e.g. in a serpentine or zig-zag the conduits being bent in a serpentine or zig-zag the conduits having a non-circular cross-section
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
    • F28F1/34—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending obliquely
    • F28F1/36—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending obliquely the means being helically wound fins or wire spirals
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2265/00—Safety or protection arrangements; Arrangements for preventing malfunction
    • F28F2265/14—Safety or protection arrangements; Arrangements for preventing malfunction for preventing damage by freezing, e.g. for accommodating volume expansion

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Geometry (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

The utility model provides a LNG vaporizer water spraying system, including the LNG vaporizer, the circulating water pond, monitoring devices, a controller, spray set, the LNG vaporizer sets up on the base, the base is provided with the leading flume that links to each other with the circulating water pond all around, independently install heating device on the lateral wall and the bottom in circulating water pond, monitoring devices includes the first temperature detect ware on the inlet tube, second temperature detect ware and the liquid level detector in the circulating water pond, the controller is according to the opening and close of the temperature signal of transmission and liquid level signal control valve and heating device, the middle part of heat transfer pipe group is provided with the multilayer water blocking layer on the vaporizer, the fin of heat transfer pipe is the spiral distribution of different forms. The invention greatly improves the heat exchange efficiency, adopts an intelligent control method, balances the relation among the water inlet heat, the consumed heat, the water quantity and the electric energy, greatly utilizes the natural hydrothermal energy, does not influence the normal use, can realize automatic control and has high control precision.

Description

LNG gasifier water spraying system and control method
Technical Field
The invention relates to the technical field of gasification of Liquefied Natural Gas (LNG), in particular to a water spraying system of an LNG gasifier and a control method.
Background
The air-temperature type gasifier is a heat exchange device which heats low-temperature LNG by utilizing natural convection of air to gasify the low-temperature LNG into normal-temperature gas. The LNG air-temperature type gasifier in the existing market is formed by connecting aluminum finned tubes at certain intervals, the outer surface of the gasifier is very easy to freeze in the using process, and the normal use of the gasifier is not facilitated if the ice layer is too thick. In a practical use process, after an ice layer with a certain thickness is accumulated on the gasifier, the use of the gasifier needs to be stopped, and the ice layer on the surface of the gasifier is melted by the atmospheric temperature and then can be used. The process of melting ice consumes longer time, and the time for melting the ice layer is greatly prolonged under the condition of lower temperature in winter. The existing gasifier spraying technology does not fully utilize water resources and heat energy, and also lacks automatic control over water temperature.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide an LNG vaporizer water spraying system which has high heat utilization efficiency and can recycle water resources and automatically control a circulating water tank, and a control method for controlling the liquid level and the temperature of the circulating water tank.
The invention is realized by the following technical scheme:
a water spraying system of an LNG vaporizer comprises the LNG vaporizer, a circulating water tank, a monitoring device, a controller and a spraying device.
The LNG vaporizer sets up on the base, the base set up in the side of circulating water pond, the base is provided with the diversion channel all around, the diversion channel with the circulating water pond links to each other, and the shower water passes through the diversion channel and flows back to the circulating water pond.
A water inlet pipe is arranged at the upper part of the circulating water tank, a water outlet pipe is arranged at the lower part of the circulating water tank, and valves are respectively arranged on the water inlet pipe and the water outlet pipe; and heating devices are respectively and independently arranged on the side wall and the bottom of the circulating water tank.
The monitoring device comprises a first temperature detector, a second temperature detector and a liquid level detector, wherein the first temperature detector is arranged on the water inlet pipe and is used for monitoring the water temperature in the water inlet pipe, the second temperature detector and the liquid level detector are arranged in the circulating water pool and are used for monitoring the temperature and the liquid level of the water in the circulating water pool, and the first temperature detector, the second temperature detector and the liquid level detector are respectively and electrically connected with the controller; the controller is respectively electrically connected with the valves on the water inlet pipe and the water discharge pipe on the circulating water tank and the heating devices on the side wall and the bottom of the circulating water tank so as to control the opening and closing of the valves and the heating devices according to the temperature signals and the liquid level signals transmitted by the first temperature detector, the second temperature detector and the liquid level detector. When the water level is too low, a valve of the water inlet pipe is opened to automatically supplement water; when the water temperature is low (lower than 5 ℃), the pool water is drained or the heating device is started. The heating device can be selectively opened according to the requirements of liquid level and the like, and one or both of the side wall heating device 12 and the bottom heating device 13 are fully opened.
Spray set includes shower head, pipeline and water pump, the shower head set up in LNG vaporizer top (like top 30cm department), the shower head is the array and distributes, at LNG vaporizer top all standing, the shower head pass through pipeline, water pump with circulating water tank links to each other, and the water pump is with water through the pipeline pump to the shower head that is located the eminence, and the vaporizer water spray below the shower head.
According to a further improved technical scheme, a stirring device is arranged in the circulating water pool, and the stirring device is started to uniformly heat water during heating. And a filtering device is arranged between the water diversion groove and the circulating water tank to filter impurities.
According to a further improved technical scheme, the LNG vaporizer comprises a liquid inlet pipe, a heat exchange pipe group and an air outlet pipe which are sequentially connected, liquefied natural gas enters from the liquid inlet pipe, is heated by the heat exchange pipe group to become gas and then flows out of the system through the air outlet pipe, the heat exchange pipe group comprises a plurality of heat exchange pipes which are arranged in parallel, and the heat exchange pipes are coiled pipes with fins on the outer side walls.
According to a further improved technical scheme, a water resisting layer which is perpendicular to the cross section of the heat exchange tube and is positioned outside the heat exchange tube is arranged in the middle of the heat exchange tube group, a through hole allowing spray water to pass through is formed in the water resisting layer, the water resisting layer is used for enabling the spray water to flow away slowly, and the contact time of the spray water and the heat exchange tube is prolonged so as to improve the heat exchange efficiency.
According to a further improved technical scheme, the water blocking layers are arranged in parallel in the vertical direction in 1-5 layers, and the interval between the water blocking layers from top to bottom is sequentially increased, so that initial spray water is fully contacted with the upper part of the heat exchange tube, the gradually cooled spray water flows away with acceleration along with the reduction of the temperature, and icing and frosting are avoided.
According to a further improved technical scheme, the fins on the heat exchange tube are spiral from top to bottom along the outer wall of the heat exchange tube, and the spiral angle of the fins is 15-80 degrees. The size of the helical angle determines the rotation degree of the fins, the larger the angle is, the larger the twisting degree of the fins is, the slower the spray water flows away, and the longer the contact time of the spray water and the heat exchange tube is.
According to a further improved technical scheme, the spiral angle is 45-80 degrees, at the moment, the fins are spiral similar to thread type spirals, the distance between every two adjacent spirals is increased in sequence from top to bottom, the retention time of the spray water is shortened gradually from top to bottom, and the heat exchange rate is improved.
The further improved technical scheme is that the inner wall of the heat exchange tube is spiral coaxial with the fins on the outer wall. The contact area of liquefied gas and inner wall has been increased to the inner wall of heat exchange tube spiral, has reduced the velocity of flow of liquefied gas, makes to produce the torrent simultaneously, is favorable to the heat exchange.
According to the further improved technical scheme, the fins on the heat exchange tube are a plurality of heat exchange fins arranged on the outer wall of the heat exchange tube, the heat exchange fins are distributed in a vertically staggered mode, and the distribution density of the heat exchange fins is sequentially reduced from top to bottom. The heat exchange fins can be vertically arranged or obliquely arranged upwards along the outer surface of the heat exchange tube, and the heat exchange fins are distributed in a staggered mode and obliquely arranged upwards to prolong the contact time of spray water and the surface of the heat exchange tube. The heat exchange fins can be spirally distributed from top to bottom along the outer wall of the heat exchange tube.
A control method of the LNG vaporizer water spray system comprises a control method of the water temperature and the liquid level of a circulating water pool, and specifically comprises the following steps:
setting the initial states of a water inlet pipe valve, a drain pipe valve, a side wall heating device and a bottom heating device to be closed states;
a. when the water temperature in the water inlet pipe is higher than or equal to a set value T1 and the water temperature in the circulating water tank is higher than or equal to a set value T2;
a1, when the liquid level value of the circulating water pool is lower than a set value H1, opening a valve of the water inlet pipe for water injection, and when the liquid level value of the circulating water pool rises to be equal to or more than a set liquid level value H2, closing the valve of the water inlet pipe;
a2, when the liquid level value of the circulating water pool is higher than or equal to a set value H1, keeping the valve of the water inlet pipe closed;
b. when the water temperature in the water inlet pipe is higher than or equal to a set value T1, and the water temperature in the circulating water tank is lower than a set value T2;
b1, when the liquid level in the circulating water pool is higher than or equal to the set value H3, opening the valve of the water discharge pipe;
b2, when the liquid level in the circulating water tank is lower than a set value H3, opening a valve of the water inlet pipe for water injection, closing or keeping to close a valve of the water outlet pipe, and when the liquid level value of the circulating water tank rises to be equal to or more than a set liquid level value H2, closing the valve of the water inlet pipe;
c. when the water temperature in the water inlet pipe is lower than a set value T1 and the water temperature in the circulating water pool is higher than or equal to a set value T2;
c1, when the liquid level in the circulating water tank is lower than a set value H4, opening a valve of the water inlet pipe for water injection, and when the liquid level value of the circulating water tank rises to be equal to or more than a set liquid level value H4, closing the valve of the water inlet pipe;
c2, when the liquid level value of the circulating water pool is equal to or more than the set liquid level value H4, keeping the valve of the water inlet pipe closed;
d. when the water temperature in the water inlet pipe is lower than a set value T1 and the water temperature in the circulating water tank is lower than a set value T2;
d1, when the liquid level in the circulating water pool is lower than or equal to the set value H5, opening the valve of the water inlet pipe for water injection, and when the liquid level in the circulating water pool is higher than the set value, closing the valve of the water inlet pipe;
d2, when the liquid level in the circulating water pool is higher than the set value H5, the heating devices on the side wall or/and the bottom of the circulating water pool are turned on, and when the temperature of the water in the circulating water pool is increased to be equal to or higher than the set value T3, the heating devices are turned off;
the set value T1, the set value T2, the set value T3, the set value H1, the set value H2, the set value H3, the set value H4 and the set value H5 have the following relations: t3> T1> T2 or T1> T3> T2, H4 ≧ H2> H5> H1> H3. T1 can be set to 10 ℃, T2 can be set to 5 ℃, T3 can be set to 15 ℃, and the setting can be flexible according to the conditions of the air temperatures of various regions.
The device comprises an LNG gasifier, a circulating water tank, a monitoring device, a controller, a spraying device and the like, wherein the surface of the gasifier is sprayed by the water spraying device, so that the ice melting speed of the surface of the gasifier is greatly accelerated, and the utilization rate of the gasifier is improved; the circulating water tank is arranged to enable spray water to be recycled, and the water blocking layer is arranged on the gasifier heat exchange assembly and the structural design of the heat exchange tube fins is adopted, so that the spray water is not frozen while the heat exchange efficiency is greatly improved; by adopting an intelligent control method for the valve and the heating device in the circulating water tank, the relation among the water inlet heat, the consumed heat, the water quantity and the electric energy is balanced, the natural hydrothermal energy is utilized to the maximum extent, the normal use is not influenced, the automatic control can be realized, and the control precision is high.
Drawings
Fig. 1 is a schematic structural diagram of embodiment 1 of the present invention.
Fig. 2 is a schematic structural view of an LNG vaporizer in embodiment 1 of the present invention.
Fig. 3 is an enlarged schematic top view of the heat exchange tube bank and the water blocking layer in the LNG vaporizer according to embodiment 1 of the present invention.
Fig. 4 is a flow chart of a control method in embodiment 1 of the present invention.
Fig. 5 is a schematic structural diagram of the heat exchange tube of the LNG vaporizer in embodiment 2 of the present invention.
Fig. 6 is a sectional view of the heat exchange pipe of the LNG vaporizer in embodiment 3 of the present invention.
Fig. 7 is a schematic perspective view of the heat exchange tube of the LNG vaporizer in embodiment 3 of the present invention.
Fig. 8 is a sectional view of another type of heat exchange tube of the LNG vaporizer in embodiment 3 of the present invention.
Fig. 9 is a schematic perspective view of another type of heat exchange tube of an LNG vaporizer in example 3 of the present invention.
Fig. 10 is a sectional view of the heat exchange pipe of the LNG vaporizer in example 4 of the present invention.
Fig. 11 is a schematic perspective view of the heat exchange tube of the LNG vaporizer in embodiment 4 of the present invention.
Reference numerals: 1-an LNG vaporizer; 2-circulating a water pool; 3-a spraying device; 4-a base; 5-a water diversion groove; 6-a filtration device; 7-a water pump; 8-a controller; 9-a monitoring device; 10-a pipeline; 11-a stirring device; 12-side wall heating means; 13-bottom heating means; 101-a liquid inlet pipe; 102-an air outlet pipe; 103-heat exchange tube; 1031-fin; 1032-heat exchanger fins; 104-a water resistant layer; 1041-a through hole; 201-a water inlet pipe; 202-a drain pipe; 203-a water inlet pipe valve; 204-drain valve; 31-a shower head; 901-a second temperature probe; 902-a liquid level detector; 903-first temperature probe.
Detailed Description
Example 1
A water spraying system of an LNG vaporizer 1 is shown in figure 1 and comprises the LNG vaporizer 1, a circulating water tank 2, a monitoring device 9, a controller 8 and a spraying device 3.
LNG vaporizer 1 sets up on base 4, base 4 set up in the side of circulating water pond 2, base 4 is provided with diversion channel 5 all around, diversion channel 5 with circulating water pond 2 links to each other, and the shower water flows back to circulating water pond 2 through diversion channel 5.
The upper part of the circulating water tank 2 is provided with a water inlet pipe 201, the lower part of the circulating water tank is provided with a water outlet pipe 202, and the water inlet pipe 201 and the water outlet pipe 202 are respectively provided with a valve, namely a water inlet pipe valve 203 and a water outlet pipe valve 204; and the side wall and the bottom of the circulating water tank 2 are respectively and independently provided with a heating device, namely a side wall heating device 12 and a bottom heating device 13. And a stirring device 11 is arranged in the circulating water tank 2, and the stirring device 11 is started to uniformly heat water during heating. And a filtering device 6 is arranged between the water diversion groove 5 and the circulating water tank 2 to filter impurities.
The monitoring device 9 comprises a first temperature detector 903, a second temperature detector 901 and a liquid level detector 902, the first temperature detector 903 is arranged on the water inlet pipe 201 and used for monitoring the water temperature in the water inlet pipe 201, the second temperature detector 901 and the liquid level detector 902 are arranged in the circulating water pool 2 and used for monitoring the temperature and the liquid level of the water in the circulating water pool 2, and the first temperature detector 903, the second temperature detector 901 and the liquid level detector 902 are respectively and electrically connected with the controller 8; the controller 8 is electrically connected with the water inlet pipe valve 203 and the water outlet pipe valve 204 on the circulating water tank 2, and the circulating water tank side wall heating device 12 and the bottom heating device 13 respectively, so as to control the opening and closing of the water inlet pipe valve 203, the water outlet pipe valve 204, the side wall heating device 12 and the bottom heating device 13 according to the temperature signals and the liquid level signals transmitted by the first temperature detector 903, the second temperature detector 901 and the liquid level detector 902. When the water level is too low, the valve 203 of the water inlet pipe is opened to automatically supplement water; when the water temperature is low (lower than 5 ℃), the pool water is drained or the heating device is started. The heating device can be selectively opened according to the requirements of liquid level and the like, and one or both of the side wall heating device 12 and the bottom heating device 13 are fully opened.
Spray set 3 includes shower head 31, pipeline 10 and water pump 7, shower head 31 set up in 1 top of LNG vaporizer (like top 30cm department), shower head 31 are the array and distribute, at 1 top of LNG vaporizer full coverage, shower head 31 pass through pipeline 10, water pump 7 with circulating water pool 2 links to each other, and water pump 7 pumps water to the shower head 31 that is located the eminence through pipeline 10, and the vaporizer water spray below shower head 31.
The LNG vaporizer 1 comprises a liquid inlet pipe 101, a heat exchange pipe set and a gas outlet pipe 102 which are sequentially connected, liquefied natural gas enters from the liquid inlet pipe 101, is heated by the heat exchange pipe set to become gas and then flows out of a system through the gas outlet pipe 102, the heat exchange pipe set comprises a plurality of heat exchange pipes 103 which are arranged in parallel, and the heat exchange pipes 103 are coiled pipes with fins 1031 on the outer side walls. The fins 1031 are arranged vertically in this embodiment.
As shown in fig. 2 and 3, a water blocking layer 104 is arranged in the middle of the heat exchange tube set, perpendicular to the cross section of the heat exchange tube 103, and outside the heat exchange tube 103, a through hole 1041 allowing the shower water to pass through is arranged in the water blocking layer 104, and the water blocking layer 104 is used for enabling the shower water to slowly flow away, so that the contact time between the shower water and the heat exchange tube 103 is prolonged, and the heat exchange efficiency is improved.
The water-resistant layers 104 are arranged in parallel in the vertical direction, the interval between the water-resistant layers 104 increases from top to bottom, the density of the through holes 1041 on the water-resistant layers 104 decreases from top to bottom, initial spray water is in full contact with the upper part of the heat exchange tube 103, gradually cooled spray water flows away with the temperature reduction in an accelerated manner, and icing and frosting are avoided.
A control method of the LNG vaporizer water spray system includes a control method of the water temperature and the liquid level of the circulating water tank, as shown in fig. 4, specifically as follows:
setting the initial states of the water inlet pipe valve 203, the water outlet pipe valve 204, the side wall heating device 12 and the bottom heating device 13 to be closed states; the temperature of the water in the inlet pipe 201 is set to TOuter coverThe water temperature in the circulating water pool is set to be TWater (W)；
a. When the temperature of the water in the water inlet pipe 201 is higher than or equal to the set value T1 and the temperature of the water in the circulating water tank 2 is higher than or equal to the set value T2;
a1, when the liquid level value of the circulating water tank 2 is lower than a set value H1, opening the valve 203 of the water inlet pipe for water injection, and when the liquid level value of the circulating water tank 2 rises to be equal to or more than a set liquid level value H2, closing the valve 203 of the water inlet pipe;
a2, when the liquid level value of the circulating water tank 2 is higher than or equal to a set value H1, keeping the valve 203 of the water inlet pipe closed;
b. when the temperature of the water in the water inlet pipe 201 is higher than or equal to the set value T1 and the temperature of the water in the circulating water tank 2 is lower than the set value T2;
b1, when the liquid level in the circulating water pool 2 is higher than or equal to the set value H3, opening the drain valve 204;
b2, when the liquid level in the circulating water pool 2 is lower than a set value H3, opening the water inlet pipe valve 203, closing or keeping closed the water outlet pipe valve 204, and when the liquid level value of the circulating water pool 2 rises to be equal to or larger than a set liquid level value H2, closing the water inlet pipe valve 203;
c. when the temperature of the water in the water inlet pipe 201 is lower than the set value T1 and the temperature of the water in the circulating water tank 2 is higher than or equal to the set value T2;
c1, when the liquid level in the circulating water tank 2 is lower than a set value H4, opening the valve 203 of the water inlet pipe for water injection, and when the liquid level value of the circulating water tank rises to be equal to or more than a set liquid level value H4, closing the valve 203 of the water inlet pipe;
c2, when the liquid level value of the circulating water pool 2 is equal to or more than the set liquid level value H4, closing or keeping closing the valve 203 of the water inlet pipe;
d. when the temperature of the water in the water inlet pipe 201 is lower than a set value T1 and the temperature of the water in the circulating water tank 2 is lower than a set value T2;
d1, when the liquid level in the circulating water tank 2 is lower than or equal to a set value H5, opening the valve 203 of the water inlet pipe for water injection, and when the liquid level in the circulating water tank 2 is higher than a set value H5, closing the valve 203 of the water inlet pipe;
d2, when the liquid level in the circulating water tank 2 is higher than the set value H5, the heating device 12 on the side wall of the circulating water tank 2 or/and the heating device 13 on the bottom of the circulating water tank 2 are/is turned on, and when the temperature of the water in the circulating water tank 2 is increased to be equal to or higher than the set value T3, the heating devices are turned off;
the set value T1, the set value T2, the set value T3, the set value H1, the set value H2, the set value H3, the set value H4 and the set value H5 have the following relations: t3> T1> T2 or T1> T3> T2, H4 ≧ H2> H5> H1> H3. T1 can be set to 10 ℃, T2 can be set to 5 ℃, T3 can be set to 15 ℃, and the setting can be flexible according to the conditions of the air temperatures of various regions.
Example 2
The rest of the heat exchange tube group is the same as that of the embodiment 1, except that the water resisting layer 104 is not arranged in the heat exchange tube group, as shown in fig. 5, the fins 1031 on the heat exchange tube 103 are spiral from top to bottom along the outer wall of the heat exchange tube 103, the spiral angle is 45-80 degrees, the fins 1031 are spiral similar to a thread, the distance between adjacent spirals is sequentially increased from top to bottom, the retention time of shower water is gradually shortened from top to bottom, and the heat exchange rate is improved.
Example 3
The rest of the embodiment 2 is the same as that of the embodiment 2, the fin 1031 on the heat exchange tube 103 is spiral from top to bottom along the outer wall of the heat exchange tube 103, and the difference is that the spiral angle is 15-45 degrees. The inner wall of the heat exchange tube 103 is a smooth inner wall as shown in fig. 6 and 7, or a spiral shape coaxial with the fins 1031 on the outer wall as shown in fig. 8 and 9. The contact area of the liquefied gas and the inner wall is increased by the spiral inner wall, the flow rate of the liquefied gas is reduced, and meanwhile, turbulence is generated, so that heat exchange is facilitated.
Example 4
The rest of the embodiment 2 is the same as that in fig. 10 and 11, except that the fin 1031 on the heat exchange tube 103 is a plurality of heat exchange fins 1032 arranged on the outer wall of the heat exchange tube 103, the positions of the heat exchange fins 1032 are distributed in a vertically staggered manner, and the distribution density of the heat exchange fins 1032 is sequentially reduced from top to bottom. The heat exchanging fins 1032 can be vertically arranged or obliquely arranged upwards along the outer surface of the heat exchanging pipe 103, and the staggered distribution and the oblique upwards arrangement are both used for prolonging the contact time of the spray water and the surface of the heat exchanging pipe 103. The fins 1032 may be spirally disposed along the outer wall of the heat exchange tube 103 from top to bottom.
The above detailed description is specific to possible embodiments of the present invention, and the embodiments are not intended to limit the scope of the present invention, and all equivalent implementations or modifications that do not depart from the scope of the present invention are intended to be included within the scope of the present invention.

Claims (10)

1. The LNG vaporizer water spraying system is characterized by comprising an LNG vaporizer, a circulating water tank, a monitoring device, a controller and a spraying device;
the LNG vaporizer is arranged on a base, water guide grooves are formed in the periphery of the base and connected with the circulating water tank to enable spray water to flow back to the circulating water tank;
a water inlet pipe is arranged at the upper part of the circulating water tank, a water outlet pipe is arranged at the lower part of the circulating water tank, valves are respectively arranged on the water inlet pipe and the water outlet pipe, and a first temperature detector is arranged on the water inlet pipe; heating devices are respectively and independently arranged on the side wall and the bottom of the circulating water tank;
the monitoring device comprises a second temperature detector and a liquid level detector, the second temperature detector and the liquid level detector are arranged in the circulating water pool and are used for monitoring the temperature and the liquid level of water in the circulating water pool, and the second temperature detector and the liquid level detector are respectively and electrically connected with the controller; the controller is respectively electrically connected with the valves on the water inlet pipe and the water outlet pipe on the circulating water tank and the heating devices on the side wall and the bottom of the circulating water tank so as to control the opening and closing of the valves and the heating devices according to the temperature signals and the liquid level signals transmitted by the second temperature detector and the liquid level detector;
spray set includes shower head, pipeline and water pump, the shower head set up in LNG vaporizer top, it through pipeline, water pump with circulating water pool links to each other, and the water pump sprays to the shower head that is located the eminence through the pipeline pump with water.
2. An LNG gasifier water spray system as claimed in claim 1, wherein an agitator is provided in the circulating water basin, and a filter is provided between the water gutter and the circulating water basin.
3. An LNG gasifier water spray system as claimed in claim 1, characterized in that the LNG gasifier comprises a liquid inlet pipe, a heat exchange pipe set and a gas outlet pipe which are connected in sequence, liquefied natural gas enters from the liquid inlet pipe, is heated by the heat exchange pipe set and then becomes gas, and then flows out of the system from the gas outlet pipe, the heat exchange pipe set comprises a plurality of heat exchange pipes which are arranged in parallel, and the heat exchange pipes are serpentine pipes with fins on the outer side walls.
4. The LNG gasifier water spray system of claim 3, wherein the heat exchange tube set is provided with a water blocking layer in the middle perpendicular to the cross section of the heat exchange tubes and outside the heat exchange tubes, and the water blocking layer is provided with through holes for allowing the spray water to pass through, so that the contact time of the spray water and the heat exchange tubes is prolonged, and the heat exchange efficiency is improved.
5. An LNG gasifier water spray system according to claim 4, characterized in that the water blocking layers have 1-5 layers and are arranged in parallel in the vertical direction, and the intervals between the water blocking layers increase from top to bottom.
6. An LNG gasifier water spray system as claimed in any one of claims 3 to 5, wherein the fins on the heat exchange tubes are helical from top to bottom along the outer wall of the heat exchange tubes, and the helix angle is 15-80 °.
7. An LNG gasifier water spray system according to claim 6, characterized in that the helix angle is 45-80 °, and the pitch between consecutive helices increases from top to bottom.
8. An LNG gasifier water spray system according to claim 6, characterized in that the inner wall of the heat exchange tubes is spiral concentric with the fins on the outer wall.
9. An LNG gasifier water spray system according to any one of claims 3 to 5, characterized in that the fins on the heat exchange tubes are a plurality of heat exchange fins arranged on the outer wall of the heat exchange tubes, the plurality of heat exchange fins are distributed in a staggered manner from top to bottom, and the distribution density of the heat exchange fins decreases from top to bottom.
10. A method of controlling an LNG vaporizer water spray system as defined in any one of claims 1 to 9, comprising:
a. when the water temperature in the water inlet pipe is higher than or equal to a set value T1 and the water temperature in the circulating water tank is higher than or equal to a set value T2;
a1, when the liquid level value of the circulating water pool is lower than a set value H1, opening a valve of the water inlet pipe for water injection, and when the liquid level value of the circulating water pool rises to be equal to or more than a set liquid level value H2, closing the valve of the water inlet pipe;
a2, when the liquid level value of the circulating water pool is higher than or equal to a set value H1, keeping the valve of the water inlet pipe closed;
b. when the water temperature in the water inlet pipe is higher than or equal to a set value T1, and the water temperature in the circulating water tank is lower than a set value T2;
b1, when the liquid level in the circulating water pool is higher than or equal to the set value H3, opening the valve of the water discharge pipe;
b2, when the liquid level in the circulating water tank is lower than a set value H3, opening a valve of the water inlet pipe for water injection, closing or keeping to close a valve of the water outlet pipe, and when the liquid level value of the circulating water tank rises to be equal to or more than a set liquid level value H2, closing the valve of the water inlet pipe;
c. when the water temperature in the water inlet pipe is lower than a set value T1 and the water temperature in the circulating water pool is higher than or equal to a set value T2;
c1, when the liquid level in the circulating water tank is lower than a set value H4, opening a valve of the water inlet pipe for water injection, and when the liquid level value of the circulating water tank rises to be equal to or more than a set liquid level value H4, closing the valve of the water inlet pipe;
c2, when the liquid level value of the circulating water pool is equal to or more than the set liquid level value H4, keeping the valve of the water inlet pipe closed;
d. when the water temperature in the water inlet pipe is lower than a set value T1 and the water temperature in the circulating water tank is lower than a set value T2;
d1, when the liquid level in the circulating water pool is lower than or equal to the set value H5, opening the valve of the water inlet pipe for water injection, and when the liquid level in the circulating water pool is higher than the set value, closing the valve of the water inlet pipe;
d2, when the liquid level in the circulating water pool is higher than the set value H5, the heating devices on the side wall or/and the bottom of the circulating water pool are turned on, and when the temperature of the water in the circulating water pool is increased to be equal to or higher than the set value T3, the heating devices are turned off;
the set value T1, the set value T2, the set value T3, the set value H1, the set value H2, the set value H3, the set value H4 and the set value H5 have the following relations: t3> T1> T2 or T1> T3> T2, H4 ≧ H2> H5> H1> H3.
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