CN117029535B - Seawater heat exchange system for LNG cold energy power generation - Google Patents
Seawater heat exchange system for LNG cold energy power generation Download PDFInfo
- Publication number
- CN117029535B CN117029535B CN202311091898.3A CN202311091898A CN117029535B CN 117029535 B CN117029535 B CN 117029535B CN 202311091898 A CN202311091898 A CN 202311091898A CN 117029535 B CN117029535 B CN 117029535B
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- China
- Prior art keywords
- heat exchange
- lng
- power generation
- seawater
- pipe body
- Prior art date
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- 239000013535 sea water Substances 0.000 title claims abstract description 51
- 238000010248 power generation Methods 0.000 title claims abstract description 47
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 claims abstract description 98
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 68
- 239000001294 propane Substances 0.000 claims abstract description 49
- 239000006200 vaporizer Substances 0.000 claims abstract description 35
- 238000009834 vaporization Methods 0.000 claims abstract description 22
- 230000008016 vaporization Effects 0.000 claims abstract description 22
- 239000006096 absorbing agent Substances 0.000 claims abstract description 21
- 238000004140 cleaning Methods 0.000 claims abstract description 21
- 230000001502 supplementing effect Effects 0.000 claims description 5
- 239000002893 slag Substances 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 239000003949 liquefied natural gas Substances 0.000 abstract description 66
- 239000012535 impurity Substances 0.000 abstract description 33
- 238000009825 accumulation Methods 0.000 abstract description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 16
- 229910000831 Steel Inorganic materials 0.000 description 10
- 238000000034 method Methods 0.000 description 10
- 239000010959 steel Substances 0.000 description 10
- 239000003345 natural gas Substances 0.000 description 8
- 239000013049 sediment Substances 0.000 description 4
- 229910000838 Al alloy Inorganic materials 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 229910001069 Ti alloy Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- OTMSDBZUPAUEDD-UHFFFAOYSA-N Ethane Chemical compound CC OTMSDBZUPAUEDD-UHFFFAOYSA-N 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010612 desalination reaction Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000004108 freeze drying Methods 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
Classifications
-
- 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
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D7/16—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C7/00—Methods or apparatus for discharging liquefied, solidified, or compressed gases from pressure vessels, not covered by another subclass
- F17C7/02—Discharging liquefied gases
- F17C7/04—Discharging liquefied gases with change of state, e.g. vaporisation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
- F28F21/08—Constructions of heat-exchange apparatus characterised by the selection of particular materials of metal
- F28F21/081—Heat exchange elements made from metals or metal alloys
- F28F21/086—Heat exchange elements made from metals or metal alloys from titanium or titanium alloys
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
- F28F9/007—Auxiliary supports for elements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
- F28F9/02—Header boxes; End plates
- F28F9/0229—Double end plates; Single end plates with hollow spaces
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
- F28G3/00—Rotary appliances
- F28G3/10—Rotary appliances having scrapers, hammers, or cutters, e.g. rigidly mounted
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention relates to the technical field of LNG cold energy power generation, and discloses a seawater heat exchange system for LNG cold energy power generation, which comprises an LNG vaporization system, a power generation system and a heat exchange system, wherein the LNG vaporization system and the power generation system exchange heat through a propane cold absorber, the vaporizer comprises a shell component and a heat exchange component, the shell component comprises a pipe body, a water inlet end and a water outlet end, the pipe body is connected with a feed interface and a water outlet interface, two ports of the pipe body are respectively sealed through the water inlet end and the water outlet end, end covers are arranged on the water inlet end and the water outlet end, and the heat exchange component divides the pipe body into two channels. When the liquefied natural gas supply pipeline or the liquefied propane enters, the pipe body pushes the cleaning disc to move to one side of the exhaust interface until the feeding interface is communicated with the exhaust interface, and when air intake is stopped, the installed spring pushes the cleaning disc to reset, so that impurities attached to the surface of the heat exchange pipe and the inner wall of the pipe body are pushed to one side of the feeding interface, and accumulation of the impurities is avoided.
Description
Technical Field
The invention relates to the technical field of LNG cold energy power generation, in particular to a seawater heat exchange system for LNG cold energy power generation.
Background
LNG is a high-quality energy source and has the characteristics of high heat value and small combustion pollution. The LNG receiving station has a main function of receiving LNG transported from an ocean-going carrier, storing and gasifying the LNG to obtain a gaseous Natural Gas (NG) product, and supplying gas to urban residents and/or industrial users through a natural gas network.
LNG is natural gas in liquid form at low temperatures of about-162 c, and the gasification process releases a large amount of cold energy. In theory, the unit cooling capacity of LNG is about 840kJ/kg, and the average cooling energy released all year round by a LNG receiving station with a scale of 300 ten thousand tons/year can reach about 80MW, which is equivalent to about 7 hundred million kW.h electric quantity. Therefore, LNG has a very large amount of cold energy, and its use has been attracting attention.
LNG cold energy is effectively and reasonably utilized, energy sources can be saved, and considerable economic and social benefits are brought. The utilization modes of the cold energy of the LNG at home and abroad can be divided into two main types of direct utilization and indirect utilization: direct utilization comprises power generation, low-temperature air separation, a freezing warehouse, liquefied carbon dioxide, sea water desalination, air conditioning, low-temperature cultivation, cultivation and the like; the indirect use includes low temperature crushing, freeze drying, low temperature drying, water and pollutant treatment, freezing food, etc. with liquid nitrogen, liquid oxygen and liquid argon obtained after air separation.
The LNG receiving station cold energy power generation system is an important aspect of LNG cold energy recycling. At present, the LNG cold energy power generation mainly comprises a direct expansion method and a low-temperature Rankine cycle. The direct expansion method is low in cold energy utilization efficiency, low in system power generation and often used in combination with the Rankine cycle.
The existing LNG receiving station low-temperature Rankine cycle cold energy power generation system generally adopts seawater as a heat source to heat and gasify, and adopts propane, ethane and the like as cycle working media. The efficiency of such power generation systems depends on the amount of heat provided by the seawater. After the conventional seawater heat exchange structure is used for a long time, a large amount of impurities are attached to the inside of the carburetor, so that the heat exchange effect is affected.
Disclosure of Invention
The invention aims to provide a seawater heat exchange system for LNG cold energy power generation, so as to solve the problems in the background art.
In order to solve the technical problems, the invention is realized by the following technical scheme:
the invention relates to a seawater heat exchange system for LNG cold energy power generation, which comprises an LNG vaporization system, a power generation system and a heat exchange system, wherein the LNG vaporization system and the power generation system both comprise a propane cold absorber, and heat exchange is carried out between the LNG vaporization system and the power generation system through the propane cold absorber;
the heat exchange system comprises two evaporators, the two evaporators are respectively arranged in the LNG vaporization system and the power generation system, and the two evaporators are communicated through a seawater pipeline;
the vaporizer comprises a shell assembly and a heat exchange assembly, wherein the shell assembly comprises a pipe body, a water inlet end and a water outlet end, the pipe body is connected with a feeding port and an exhaust port, two ports of the pipe body are respectively sealed through the water inlet end and the water outlet end, end covers are arranged on the water inlet end and the water outlet end, the heat exchange assembly divides the pipe body into two channels, the heat exchange assembly comprises a first fixed disc, a heat exchange pipe and a second fixed disc, a plurality of round holes are formed in the first fixed disc and the second fixed disc, the corresponding two round holes are communicated through the heat exchange pipe, a cleaning disc is sleeved on the heat exchange pipe, a spring is sleeved on at least one heat exchange pipe, and the spring pushes the cleaning disc to move towards one side of the feeding port;
the heat exchange assembly is arranged in the pipe body to form two channels, the liquefied natural gas supply pipeline or liquefied propane enters the pipe body and flows through the outer surface of the heat exchange pipe, seawater enters the water inlet end through a connecting pipe arranged at the water inlet end, flows through the heat exchange pipe and enters the water outlet end, and is discharged through the connecting end of the water outlet end; the heat exchange is realized through the heat exchange pipe in the heat exchange component, the liquefied natural gas supply pipeline or liquefied propane is vaporized through absorbing the heat of seawater, and compared with the traditional aluminum alloy pipeline and copper pipe, the titanium alloy pipeline is adopted as the heat exchange pipe in the heat exchange component, so that the corrosion resistance is improved;
in addition, the outer pipe body pushes the cleaning disc to move to one side of the exhaust interface in the air inlet process until the feeding interface is communicated with the exhaust interface, and when air inlet is stopped, the installed spring pushes the cleaning disc to reset, so that impurities attached to the surface of the heat exchange pipe and the inner wall of the pipe body are pushed to one side of the feeding interface, and accumulation of the impurities is avoided.
Further, the LNG vaporization system comprises an LNG storage tank, a vaporizer, an LNG booster pump and a propane cold absorber, wherein the LNG storage tank, the LNG booster pump, the propane cold absorber and the vaporizer are communicated in sequence;
the power generation system comprises a vaporizer, a propane cold absorber, a circulating pump and expansion power generation equipment, wherein the circulating pump, the vaporizer, the power generation equipment and the propane cold absorber are mutually communicated to form a circulating loop;
the seawater outlet end of one vaporizer is communicated with the seawater inlet end of the other vaporizer in the heat exchange system.
Further, the water inlet end of the expansion power generation equipment is connected with a water supplementing pump, the water inlet end of the water supplementing pump is positioned in the sea water, the sea water is supplemented for the expansion power generation equipment through the installed water supplementing pump, and the consumption of the sea water in the heat exchange process is met.
Further, a rotating ring is rotatably arranged on the outer side of the cleaning disc, a first ball is arranged on the outer side face of the rotating ring, a first spiral groove is formed in the inner wall of the pipe body, the first ball is matched in the first spiral groove, meanwhile, the first ball moves along the first spiral groove, and a plurality of inclined plates are annularly distributed on the end face of the rotating ring;
the pipe body pushes the cleaning disc to move to one side of the exhaust interface in the process of entering the liquefied natural gas supply pipeline or the liquefied propane until the feeding interface is communicated with the exhaust interface, and when air intake is stopped, the installed spring pushes the cleaning disc to reset, so that impurities attached to the surface of the heat exchange pipe and the inner wall of the pipe body are pushed to one side of the feeding interface, and accumulation of the impurities is avoided.
Further, a through groove is formed in the bottom of the pipe body, the through groove and the feeding interface are correspondingly distributed, a slag discharging port is arranged on the outer side of the through groove, a valve is arranged in the through groove, the valve is an arc-shaped plate body, the arc-shaped plate body is arranged in the through groove through a pin shaft, the arc-shaped plate body is connected with the pin shaft through a torsion spring, and downward thrust pushes the valve to rotate downwards, so that the through groove is opened;
the pivoted swash plate promotes the impurity of clearance to the inner wall one side motion of body, realizes the collection of impurity to promote impurity motion to logical groove one side extremely, the gaseous promotion valve that gets into through the feeding interface rotates downwards, realizes leading to the groove and opens, thereby discharged through the sediment mouth, the air that flows also drives the impurity of clearance and discharges, closes through the solenoid valve that installs on the sediment mouth of will discharging when carrying out heat transfer work, avoids air discharge.
Further, the outside tip of drainage end is established to the opening, and the opening is sealed through the end cover, install the dredging rod in the heat exchange tube, the heat exchange tube is all stretched out at the both ends of dredging rod, wherein, in the one end of dredging rod stretches out the water inlet end, install the base in the water inlet end, the end that stretches out of dredging rod rotates to install in the mounting hole of base, in the drainage end is stretched out to the other end of dredging rod, be equipped with the moving part in the drainage end, install hydraulic telescoping rod on the end cover, hydraulic telescoping rod's flexible end stretches into in the drainage end and is connected with the moving part, the end connection of moving part and dredging rod.
Further, the dredging rod is provided with a helical blade on one section of the outer surface of the heat exchange tube, one end of the dredging rod is matched and installed in a guide hole formed in the moving part, a second helical groove is formed in the outer surface of one end of the dredging rod, which is close to the moving part, and the second helical groove is matched with a salient point formed in the guide hole.
Further, the moving part comprises a moving disc and a rotating sleeve, a plurality of guide holes are formed in the moving disc, annular grooves are formed in the inner walls of the guide holes, mounting grooves are formed in the inner walls of the annular grooves, pawls are mounted in the mounting grooves, the rotating sleeve is mounted in the guide holes, a ratchet wheel is fixed on the outer side of the rotating sleeve and is matched with the annular grooves, and meanwhile the ratchet wheel is matched with the pawls.
Further, a limiting ring is arranged in the drainage end, a plurality of ribs are arranged on the inner wall of the limiting ring, a plurality of limiting grooves are formed in the peripheral side face of the movable disc, the movable disc is arranged in the limiting ring, and meanwhile, the limiting grooves are matched with the ribs;
because contain a large amount of impurity in the sea water, easy attachment has the impurity on the inside of heat exchange tube after long-term work, influence the heat transfer effect of heat exchange tube, when need clear up the heat exchange tube, work through control hydraulic telescoping rod, realize hydraulic telescoping rod's flexible end and carry out periodic flexible work, when hydraulic telescoping rod's flexible end extension, hydraulic telescoping rod's flexible end promotes the moving part and moves to one side that is close to the heat exchange assembly along the spacing ring, moving part internally mounted's steel ball is along the second helicla flute motion that the mediation rod tip was seted up this moment, because pawl and ratchet carry out spacing cooperation and avoid rotating the sleeve pipe to take place to rotate, thereby the mediation rod steel ball promotes the second helicla flute, the mediation rod that is rotates, be equipped with helical blade on the pivoted mediation rod, the inside impurity discharge of pivoted helical blade promotes the heat exchange tube, helical blade clears up the inner wall of heat exchange tube simultaneously, the flexible steel ball moves along the second helicla flute that the mediation rod tip was seted up, thereby drive moving part internally mounted's steel ball and move along the second helicla flute that the mediation rod tip was seted up, because there is friction and helical blade and the inside friction sleeve pipe exists between the inside the base junction, realize that the inside rotates the inside rotation of the realization is taken off the inside rotation of the promotion sleeve pipe, realize the inside rotation of the inside through the inside rotation of the promotion pipe, realize the inside rotation of the inside through the one side of the promotion, realize the inside rotation of the drain through the promotion, the inside that can be realized.
The invention has the following beneficial effects:
1. according to the invention, the heat exchange assembly is arranged in the pipe body, so that two channels are formed, the liquefied natural gas supply pipeline or liquefied propane enters the pipe body and flows through the outer surface of the heat exchange pipe, seawater enters the water inlet end through the connecting pipe arranged at the water inlet end, flows through the heat exchange pipe and enters the water outlet end, and is discharged through the connecting end of the water outlet end; the heat exchange is realized through the heat exchange pipe in the heat exchange component, the liquefied natural gas supply pipeline or liquefied propane is vaporized through absorbing the heat of seawater, and the heat exchange pipe in the heat exchange component adopts a titanium alloy pipeline, so that compared with the traditional aluminum alloy pipeline and copper pipe, the corrosion resistance is improved.
2. According to the invention, the cleaning disc is pushed to move to one side of the exhaust interface in the process of entering the liquefied natural gas supply pipeline or the liquefied propane until the feeding interface is communicated with the exhaust interface, and the installed spring pushes the cleaning disc to reset when air inlet is stopped, so that impurities attached to the surface of the heat exchange tube and the inner wall of the tube body are pushed to one side of the feeding interface, and the accumulation of the impurities is avoided.
3. According to the invention, the spiral blades are arranged on the rotating dredging rod, the rotating spiral blades push impurities in the heat exchange tube to be discharged, meanwhile, the spiral blades clean the inner wall of the heat exchange tube, the telescopic steel balls move along the second spiral grooves formed in the end parts of the dredging rod, so that the steel balls arranged in the moving part are driven to move along the second spiral grooves formed in the end parts of the dredging rod, and as friction exists between the connection part of the dredging rod and the base and friction exists between the spiral blades and the inner wall of the heat exchange tube, the rotating sleeve pushes the pawl to deflect to one side, so that the rotating sleeve rotates around the dredging rod, the impurities in the heat exchange tube are pushed to enter the drainage end through unidirectional rotation of the dredging rod, and the impurities in the drainage end are cleaned through disassembling the drainage end.
Drawings
FIG. 1 is a schematic diagram of the overall system architecture of the present invention;
FIG. 2 is a schematic view of a carburetor according to the present invention;
FIG. 3 is a schematic cross-sectional view of a carburetor according to the present invention;
FIG. 4 is a schematic view of the internal heat exchange assembly of the carburetor of the present invention;
FIG. 5 is a schematic view of the drain end structure of the present invention;
FIG. 6 is a schematic view of a heat exchange assembly according to the present invention;
FIG. 7 is a schematic diagram of a mobile software architecture according to the present invention;
FIG. 8 is a schematic view of a part of a cross-sectional structure of a moving member according to the present invention;
FIG. 9 is an enlarged schematic view of the structure of FIG. 8A according to the present invention;
FIG. 10 is a schematic view of a pipe body structure according to the present invention;
FIG. 11 is a schematic view of a partial cross-sectional structure of a pipe body according to the present invention;
in the drawings, the list of components represented by the various numbers is as follows:
in the figure: 1. an LNG storage tank; 2. a vaporizer; 201. a tube body; 2011. a feed port; 2012. an exhaust interface; 2013. a slag discharge port; 2014. a through groove; 2015. a valve; 2016. a first helical groove; 202. a support; 203. a water inlet end; 2031 a base; 204. a drainage end; 205. an end cap; 206. a hydraulic telescopic rod; 207. a moving member; 2071. a moving tray; 20711. a limit groove; 20712. a mounting groove; 2072. rotating the sleeve; 20721. a ratchet wheel; 2073. a pawl; 208. a heat exchange assembly; 2081. a first fixed plate; 2082. a heat exchange tube; 2083. a second fixed disk; 2084. a dredging rod; 20841. a second helical groove; 2085. a cleaning plate; 2086. a rotating ring; 2087. a spring; 209. a limiting ring; 3. LNG booster pumps; 4. a propane chiller; 5. a circulation pump; 6. an expansion power plant.
Detailed Description
Referring to fig. 1-11, the invention discloses a seawater heat exchange system for LNG cold energy power generation, which comprises an LNG vaporization system, a power generation system and a heat exchange system, wherein the LNG vaporization system and the power generation system both comprise a propane cold absorber 4, and heat exchange is performed between the LNG vaporization system and the power generation system through the propane cold absorber 4.
The heat exchange system comprises two evaporators 2, the two evaporators 2 are respectively arranged in the LNG vaporization system and the power generation system, and meanwhile, the two evaporators 2 are communicated through a seawater pipeline.
The LNG vaporization system comprises an LNG storage tank 1, a vaporizer 2, an LNG booster pump 3 and a propane cold absorber 4, wherein the LNG storage tank 1, the LNG booster pump 3, the propane cold absorber 4 and the vaporizer 2 are sequentially communicated.
In the working process of the LNG vaporization system, liquefied natural gas exists in an LNG storage tank 1, the liquefied natural gas is conveyed to a natural gas inlet of a propane cold absorber 4 through an LNG booster pump, enters a natural gas inlet of a vaporizer 2 communicated with the LNG storage tank through an outlet of the propane cold absorber 4, is vaporized by heat exchange between the vaporizer 2 and seawater flowing through the interior of the vaporizer 2, and is conveyed into a natural gas pipeline through a natural gas outlet of the vaporizer 2.
The power generation system comprises a vaporizer 2, a propane cold absorber 4, a circulating pump 5 and an expansion power generation device 6, wherein the circulating pump 5, the vaporizer 2, the power generation device 6 and the propane cold absorber 4 are mutually communicated to form a circulating loop.
In the working process of the power generation system, the working circulating pump 5 conveys liquefied propane into the propane inlet of the other vaporizer 2, the propane is vaporized through heat exchange between the vaporizer 2 and seawater flowing through the interior of the vaporizer 2, the vaporized propane is expanded and pressurized to generate power through the expansion power generation equipment 6, the vaporized propane after passing through the expansion power generation equipment 6 enters the propane inlet of the propane condenser 4, the propane is subjected to heat exchange with the passing liquefied natural gas through the propane condenser 4, the liquefied propane is liquefied through the propane outlet of the propane condenser 4, and the liquefied propane enters a pipeline and is pushed by the circulating pump 5 to perform circulating motion.
The seawater outlet end of one vaporizer 2 in the heat exchange system is communicated with the seawater inlet end of the other vaporizer 2.
The seawater inlet end of the vaporizer 2 communicated with the power generation system is used for realizing water inlet through a water pump arranged in the seawater, the seawater enters the vaporizer 2 communicated with the power generation system for heat exchange, and the heat of the seawater is absorbed by propane to realize propane vaporization.
The seawater inlet end of the vaporizer 2 communicated with the LNG vaporization system is used for realizing water inlet through a water pump arranged in the seawater or realizing water supply through another vaporizer 2, the seawater enters the vaporizer 2 communicated with the LNG vaporization system for heat exchange, and the heat of the seawater is absorbed by liquefied natural gas to realize vaporization of the liquefied natural gas.
The vaporizer 2 comprises a shell assembly and a heat exchange assembly 208, the shell assembly comprises a pipe body 201, a water inlet end 203 and a water outlet end 204, a feeding port 2011 and an exhaust port 2012 are connected to the pipe body 201, two ports of the pipe body 201 are respectively sealed through the water inlet end 203 and the water outlet end 204, an end cover 205 is arranged on each of the water inlet end 203 and the water outlet end 204, the heat exchange assembly 208 divides the pipe body 201 into two channels, the heat exchange assembly 208 comprises a first fixing plate 2081, a heat exchange tube 2082 and a second fixing plate 2083, a plurality of round holes are formed in each of the first fixing plate 2081 and the second fixing plate 2083, the corresponding round holes are communicated through the heat exchange tube 2082, a cleaning plate 2085 is sleeved on the plurality of heat exchange tubes 2082, a spring 2087 is sleeved on at least one heat exchange tube 2082 to push the cleaning plate 2085 to move to one side of the feeding port 2011, seawater enters the water inlet end 203 through a connecting tube 203 arranged on the water inlet end 203 and flows through the heat exchange tube 2 into the water outlet end 204, and is discharged through the connecting end 204.
Two channels are formed by mounting a heat exchange assembly 208 inside the tube 201.
The pipe 201, the feed port 2011 and the exhaust port 2012 form a channel, the feed port 2011 is communicated with a liquefied natural gas supply pipeline or a liquefied propane supply pipeline, the liquefied natural gas supply pipeline or the liquefied propane enters the pipe 201, flows through the outer surface of the heat exchange pipe 2082, and is exhausted through the exhaust port.
The water inlet end 203, the heat exchange tube 2082 and the water discharge end 204 form another channel, the installed heat exchange tube 2082 is communicated between the water inlet end 203 and the water discharge end 204, seawater enters the water inlet end 203 through a connecting pipe arranged at the water inlet end 203, flows through the heat exchange tube 2082 into the water discharge end 204, and is discharged through a connecting end of the water discharge end 204.
The heat exchange is realized through the heat exchange tube 2082 in the heat exchange assembly 208, the liquefied natural gas supply pipeline or liquefied propane is vaporized through absorbing the heat of seawater, and the heat exchange tube 2082 in the heat exchange assembly 208 adopts a titanium alloy pipeline, so that compared with the traditional aluminum alloy pipeline and copper pipe, the corrosion resistance is improved.
In addition, in the process of entering the liquefied natural gas supply pipeline or the liquefied propane, the outer pipe 201 pushes the cleaning disc 2085 to move to one side of the exhaust interface 2012 until the feeding interface 2011 is communicated with the exhaust interface 2012, and when the air intake is stopped, the mounted spring 2087 pushes the cleaning disc 2085 to reset, so that impurities attached to the surface of the heat exchange pipe 2082 and the inner wall of the pipe 201 are pushed to one side of the feeding interface 2011, and accumulation of the impurities is avoided.
The outside rotation of cleaning disc 2085 is installed and is rotated ring 2086, installs first ball on the lateral surface of ring 2086, has seted up first helical groove 2016 on the inner wall of body 201, and first ball cooperation is in first helical groove 2016, and first ball moves along first helical groove 2016 simultaneously, and the annular distributes on the terminal surface of ring 2086 has a plurality of swash plate.
When the installed spring 2087 pushes the cleaning disc 2085 to reset, a first ball is installed on the outer side face of the rotating ring 2086, a first spiral groove 2016 is formed in the inner wall of the pipe 201, the first ball is matched in the first spiral groove 2016, meanwhile, the first ball moves along the first spiral groove 2016, accordingly, the rotating ring 2086 is installed to rotate, a plurality of inclined plates are distributed on the rotating ring 2086 in an annular mode, and the rotating inclined plates push cleaned impurities to move to one side of the inner wall of the pipe 201, so that collection of the impurities is achieved.
The bottom of body 201 has been seted up logical groove 2014, logical groove 2014 and feed interface 2011 correspond the distribution, and the slag tap 2013 is installed in logical groove 2014's the outside, installs valve 2015 in the logical groove 2014, and wherein, valve 2015 is the arc plate body, and the arc plate body passes through the round pin axle and installs in logical groove 2014, is connected through torsion spring between arc plate body and the round pin axle, and decurrent thrust promotes valve 2015 and rotates downwards, realizes opening logical groove 2014.
The pivoted swash plate promotes the impurity of clearance to the inner wall one side motion of body 201, realizes the collection of impurity to promote impurity motion to logical groove 2014 one side to, the gas that gets into through feed interface 2011 promotes valve 2015 and rotates downwards, realizes that logical groove 2014 opens, thereby has discharged through the sediment mouth 2013, and the air that flows also drives the impurity of clearance and discharges, closes through the solenoid valve of installing on sediment mouth 2013 when carrying out heat transfer work, avoids the air to discharge.
The outside tip of drain end 204 is established to the opening, the opening is sealed through end cover 205, install the mediation pole 2084 in the heat exchange tube 2082, the heat exchange tube 2082 is all stretched out at the both ends of mediation pole 2084, wherein, in the one end of mediation pole 2084 stretched out into water inlet 203, install base 2031 in the water inlet 203, the stretching end rotation of mediation pole 2084 is installed in the mounting hole of base 2031, the other end of mediation pole 2084 stretches out in the drain end 204, be equipped with moving member 207 in the drain end 204, install hydraulic telescoping rod 206 on the end cover 205, hydraulic telescoping rod 206's flexible end stretches into in the drain end 204 and is connected with moving member 207, moving member 207 and the end connection of mediation pole 2084.
The dredging rod 2084 is provided with helical blades on one section of the outer surface of the heat exchange tube 2082, one end of the dredging rod 2084 is matched with the guide hole formed in the moving member 207, the outer surface of one end of the dredging rod 2084, which is close to the moving member 207, is provided with a second helical groove 20841, and the second helical groove 20841 is matched with the protruding point formed in the guide hole.
The moving member 207 comprises a moving plate 2071 and a rotating sleeve 2072, wherein a plurality of guide holes are formed in the moving plate 2071, a ring groove is formed in the inner wall of the guide holes, a mounting groove 20712 is formed in the inner wall of the ring groove, a pawl 2073 is mounted in the mounting groove 20712, the rotating sleeve 2072 is mounted in the guide holes, a ratchet wheel 20721 is fixed on the outer side of the rotating sleeve 2072, the ratchet wheel 20721 is matched in the ring groove, and meanwhile the ratchet wheel 20721 is matched with the pawl 2073.
A limiting ring 209 is arranged in the drainage end 204, a plurality of ribs are arranged on the inner wall of the limiting ring 209, a plurality of limiting grooves 20711 are formed in the peripheral side face of the movable disc 2071, the movable disc 2071 is arranged in the limiting ring 209, and meanwhile the limiting grooves 20711 are matched with the ribs.
Because sea water contains a large amount of impurities, impurities are easy to adhere to the inside of the heat exchange tube 2082 after long-term work, and the heat exchange effect of the heat exchange tube 2082 is affected.
When the heat exchange tube 2082 needs to be cleaned, the hydraulic telescopic rod 206 is controlled to work, the telescopic end of the hydraulic telescopic rod 206 is periodically telescopic, when the telescopic end of the hydraulic telescopic rod 206 stretches, the telescopic end of the hydraulic telescopic rod 206 pushes the moving part 207 to move along the limiting ring 209 towards one side close to the heat exchange assembly 208, at the moment, the steel ball internally mounted in the moving part 207 moves along the second spiral groove 20841 formed in the end part of the dredging rod 2084, and the pawl 2073 and the ratchet wheel 20721 are in limiting fit to avoid rotating the rotating sleeve 2072, so that the steel ball of the dredging rod 2084 pushes the second spiral groove 20841, the dredging rod 2084 rotates, the rotating dredging rod 2084 is provided with spiral blades, and the rotating spiral blades push impurities in the heat exchange tube 2082 to be discharged, and meanwhile, the spiral blades clear the inner wall of the heat exchange tube 2082.
The telescopic steel ball moves along the second spiral groove 20841 formed in the end portion of the dredging rod 2084, so that the steel ball which is internally installed in the moving piece 207 is driven to move along the second spiral groove 20841 formed in the end portion of the dredging rod 2084, and because friction exists at the joint of the dredging rod 2084 and the base 2031 and friction exists between the spiral blade and the inner wall of the heat exchange tube 2082, the rotation resistance of the rotating sleeve 2072 is smaller than that of the friction, the rotating sleeve 2072 is enabled to push the pawl 2073 to deflect to one side, the rotating sleeve 2072 is enabled to rotate around the dredging rod 2084, the rotating sleeve 2072 is enabled to move along the axis direction of the dredging rod 2084, and unidirectional rotation of the dredging rod 2084 is achieved.
Through the unidirectional rotation of the dredging rod 2084, impurities inside the heat exchange tube 2082 are pushed into the drainage end 204, and impurities inside the drainage end 204 are cleaned by disassembling the drainage end 204.
In addition, a drain outlet may be provided at the bottom of the drain end 204, and the impurity is discharged through the drain outlet.
Claims (8)
1. The seawater heat exchange system for LNG cold energy power generation comprises an LNG vaporization system, a power generation system and a heat exchange system, wherein the LNG vaporization system and the power generation system both comprise a propane cold absorber (4), and heat exchange is carried out between the LNG vaporization system and the power generation system through the propane cold absorber (4);
the heat exchange system comprises two evaporators (2), the two evaporators (2) are respectively arranged in the LNG vaporization system and the power generation system, and meanwhile, the two evaporators (2) are communicated through a seawater pipeline, and the heat exchange system is characterized in that:
the vaporizer (2) comprises a housing assembly and a heat exchange assembly (208);
the shell assembly comprises a pipe body (201), a water inlet end (203) and a water outlet end (204), wherein a feeding interface (2011) and an exhaust interface (2012) are connected to the pipe body (201), and two ports of the pipe body (201) are respectively sealed through the water inlet end (203) and the water outlet end (204);
wherein, the water inlet end (203) and the water outlet end (204) are provided with end covers (205);
the heat exchange assembly (208) divides the tube body (201) into two channels;
the heat exchange assembly (208) comprises a first fixed disc (2081), a heat exchange tube (2082) and a second fixed disc (2083), wherein a plurality of round holes are formed in the first fixed disc (2081) and the second fixed disc (2083), and the two corresponding round holes are communicated through the heat exchange tube (2082);
a cleaning disc (2085) is sleeved on the plurality of heat exchange tubes (2082), wherein at least one heat exchange tube (2082) is sleeved with a spring (2087), and the spring (2087) pushes the cleaning disc (2085) to move to one side of the feeding interface (2011);
a rotating ring (2086) is rotatably arranged on the outer side of the cleaning disc (2085), and a first ball is arranged on the outer side surface of the rotating ring (2086);
a first spiral groove (2016) is formed in the inner wall of the pipe body (201), the first balls are matched in the first spiral groove (2016), and meanwhile, the first balls move along the first spiral groove (2016);
a plurality of sloping plates are annularly distributed on the end face of the rotating ring (2086).
2. A seawater heat exchange system for LNG cold energy generation as claimed in claim 1, wherein: the LNG vaporization system comprises an LNG storage tank (1), a vaporizer (2), an LNG booster pump (3) and a propane cold absorber (4), wherein the LNG storage tank (1), the LNG booster pump (3), the propane cold absorber (4) and the vaporizer (2) are sequentially communicated;
the power generation system comprises a vaporizer (2), a propane cold absorber (4), a circulating pump (5) and expansion power generation equipment (6), wherein the circulating pump (5), the vaporizer (2), the power generation equipment (6) and the propane cold absorber (4) are mutually communicated to form a circulating loop;
the seawater outlet end of one vaporizer (2) in the heat exchange system is communicated with the seawater inlet end of the other vaporizer (2).
3. A seawater heat exchange system for LNG cold energy generation as claimed in claim 2, wherein: the water inlet end of the expansion power generation equipment (6) is connected with a water supplementing pump, and the water inlet end of the water supplementing pump is positioned in seawater.
4. A seawater heat exchange system for LNG cold energy generation according to claim 3, wherein: a through groove (2014) is formed in the bottom of the pipe body (201), the through groove (2014) is distributed corresponding to the feeding interface (2011), and a slag discharging port (2013) is arranged on the outer side of the through groove (2014);
a valve (2015) is arranged in the through groove (2014);
wherein, valve (2015) is the arc plate body, and the arc plate body is installed in logical groove (2014) through the round pin axle, is connected through torsion spring between arc plate body and the round pin axle, and decurrent thrust promotes valve (2015) and decurrent, realizes opening logical groove (2014).
5. A seawater heat exchange system for LNG cold energy generation as claimed in claim 1, wherein: the outer end part of the water discharge end (204) is provided with an opening, and the opening is closed by an end cover (205);
a dredging rod (2084) is arranged in the heat exchange tube (2082), and two ends of the dredging rod (2084) extend out of the heat exchange tube (2082);
one end of the dredging rod (2084) extends out of the water inlet end (203), a base (2031) is arranged in the water inlet end (203), the extending end of the dredging rod (2084) is rotatably arranged in a mounting hole of the base (2031), and the other end of the dredging rod (2084) extends out of the water outlet end (204);
a moving part (207) is arranged in the drainage end (204), a hydraulic telescopic rod (206) is arranged on the end cover (205), and the telescopic end of the hydraulic telescopic rod (206) stretches into the drainage end (204) and is connected with the moving part (207);
the moving piece (207) is connected with the end part of the dredging rod (2084).
6. A seawater heat exchange system for LNG cold energy generation as claimed in claim 5, wherein: the dredging rod (2084) is provided with a spiral blade on the outer surface of one section of the heat exchange tube (2082);
one end of the dredging rod (2084) is matched and installed in a guide hole formed in the moving piece (207);
the dredging rod (2084) is close to the outer surface of one end of the moving piece (207) and is provided with a second spiral groove (20841), and the second spiral groove (20841) is matched with the protruding point arranged in the guide hole.
7. A seawater heat exchange system for LNG cold energy generation as claimed in claim 6, wherein: the movable part (207) comprises a movable disc (2071) and a rotating sleeve (2072), a plurality of guide holes are formed in the movable disc (2071), annular grooves are formed in the inner walls of the guide holes, mounting grooves (20712) are formed in the inner walls of the annular grooves, pawls (2073) are arranged in the mounting grooves (20712), the rotating sleeve (2072) is arranged in the guide holes, a ratchet wheel (20721) is fixed on the outer side of the rotating sleeve (2072), the ratchet wheel (20721) is matched in the annular grooves, and meanwhile the ratchet wheel (20721) is matched with the pawls (2073).
8. A seawater heat exchange system for LNG cold energy generation as claimed in claim 7, wherein: a limiting ring (209) is arranged in the drainage end (204), and a plurality of ribs are arranged on the inner wall of the limiting ring (209);
a plurality of limit grooves (20711) are formed in the peripheral side face of the movable disc (2071), the movable disc (2071) is installed in the limit ring (209), and meanwhile the limit grooves (20711) are matched with the protruding edges.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311091898.3A CN117029535B (en) | 2023-08-28 | 2023-08-28 | Seawater heat exchange system for LNG cold energy power generation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311091898.3A CN117029535B (en) | 2023-08-28 | 2023-08-28 | Seawater heat exchange system for LNG cold energy power generation |
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| Publication Number | Publication Date |
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| CN117029535A CN117029535A (en) | 2023-11-10 |
| CN117029535B true CN117029535B (en) | 2024-03-19 |
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| Application Number | Title | Priority Date | Filing Date |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR980010314A (en) * | 1996-07-03 | 1998-04-30 | 한갑수 | Heat exchanger for vaporizing liquefied natural gas |
| EP2410279A1 (en) * | 2010-07-21 | 2012-01-25 | Thomas Hipp | Low-maintenance heat exchanger comprising rotating scrapers |
| CN210512772U (en) * | 2019-08-01 | 2020-05-12 | 佛山市资新节能设备有限公司 | Self-filtering efficient titanium heat exchanger |
| CN113295040A (en) * | 2021-06-23 | 2021-08-24 | 天津佰焰加氢装备有限公司 | LNG-hydrogenation co-building station has self-cleaning function's cryogenic heat exchanger |
| CN216770287U (en) * | 2021-12-24 | 2022-06-17 | 辽宁一重装备制造有限公司 | Double-tube plate heat exchanger |
-
2023
- 2023-08-28 CN CN202311091898.3A patent/CN117029535B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR980010314A (en) * | 1996-07-03 | 1998-04-30 | 한갑수 | Heat exchanger for vaporizing liquefied natural gas |
| EP2410279A1 (en) * | 2010-07-21 | 2012-01-25 | Thomas Hipp | Low-maintenance heat exchanger comprising rotating scrapers |
| CN210512772U (en) * | 2019-08-01 | 2020-05-12 | 佛山市资新节能设备有限公司 | Self-filtering efficient titanium heat exchanger |
| CN113295040A (en) * | 2021-06-23 | 2021-08-24 | 天津佰焰加氢装备有限公司 | LNG-hydrogenation co-building station has self-cleaning function's cryogenic heat exchanger |
| CN216770287U (en) * | 2021-12-24 | 2022-06-17 | 辽宁一重装备制造有限公司 | Double-tube plate heat exchanger |
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| Publication number | Publication date |
|---|---|
| CN117029535A (en) | 2023-11-10 |
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