CN113153474B - Marine diesel engine exhaust gas waste heat recycling system and recycling method thereof - Google Patents
Marine diesel engine exhaust gas waste heat recycling system and recycling method thereof Download PDFInfo
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- CN113153474B CN113153474B CN202110532154.5A CN202110532154A CN113153474B CN 113153474 B CN113153474 B CN 113153474B CN 202110532154 A CN202110532154 A CN 202110532154A CN 113153474 B CN113153474 B CN 113153474B
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- 239000007789 gas Substances 0.000 title claims abstract description 100
- 238000004064 recycling Methods 0.000 title claims abstract description 27
- 239000002918 waste heat Substances 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 22
- 239000002912 waste gas Substances 0.000 claims abstract description 178
- AMXOYNBUYSYVKV-UHFFFAOYSA-M lithium bromide Chemical compound [Li+].[Br-] AMXOYNBUYSYVKV-UHFFFAOYSA-M 0.000 claims abstract description 53
- 238000001816 cooling Methods 0.000 claims abstract description 27
- 239000013535 sea water Substances 0.000 claims abstract description 26
- 238000005057 refrigeration Methods 0.000 claims abstract description 18
- 238000010612 desalination reaction Methods 0.000 claims abstract description 16
- 230000000149 penetrating effect Effects 0.000 claims abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 70
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 48
- 239000001569 carbon dioxide Substances 0.000 claims description 24
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 24
- 238000006056 electrooxidation reaction Methods 0.000 claims description 22
- 239000010865 sewage Substances 0.000 claims description 12
- 238000007789 sealing Methods 0.000 claims description 10
- 239000002351 wastewater Substances 0.000 claims description 10
- 238000011084 recovery Methods 0.000 claims description 9
- 238000000746 purification Methods 0.000 claims description 8
- 230000005611 electricity Effects 0.000 claims description 6
- 239000013505 freshwater Substances 0.000 claims description 6
- 239000012528 membrane Substances 0.000 claims description 6
- 238000010248 power generation Methods 0.000 claims description 6
- 230000004044 response Effects 0.000 claims description 6
- 238000001223 reverse osmosis Methods 0.000 claims description 6
- 238000002309 gasification Methods 0.000 claims description 5
- 238000004378 air conditioning Methods 0.000 claims description 4
- 239000012267 brine Substances 0.000 claims description 3
- 230000003647 oxidation Effects 0.000 claims description 3
- 238000007254 oxidation reaction Methods 0.000 claims description 3
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 2
- 230000008676 import Effects 0.000 claims description 2
- 230000009467 reduction Effects 0.000 description 6
- 230000006698 induction Effects 0.000 description 5
- 239000000243 solution Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 239000002957 persistent organic pollutant Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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- 238000004134 energy conservation Methods 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 150000002926 oxygen Chemical class 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N5/00—Exhaust or silencing apparatus combined or associated with devices profiting by exhaust energy
- F01N5/02—Exhaust or silencing apparatus combined or associated with devices profiting by exhaust energy the devices using heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K13/00—General layout or general methods of operation of complete plants
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K25/00—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
- F01K25/08—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours
- F01K25/10—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours the vapours being cold, e.g. ammonia, carbon dioxide, ether
- F01K25/103—Carbon dioxide
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K27/00—Plants for converting heat or fluid energy into mechanical energy, not otherwise provided for
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention discloses a system and a method for recycling waste heat of exhaust gas of a marine diesel engine, wherein a first exhaust gas pipeline is of a three-way structure, one port of the first exhaust gas pipeline is an exhaust gas inlet, and the other two ports of the first exhaust gas pipeline are respectively communicated with gas inlets of a first exhaust gas collecting cabinet and a second exhaust gas collecting cabinet; a seawater desalination circulation loop is arranged in the first waste gas collection cabinet in a penetrating manner, and a lithium bromide refrigeration circulation loop is arranged in the second waste gas collection cabinet in a penetrating manner; the second waste gas pipeline is of a three-way structure, two ports of the second waste gas pipeline are respectively communicated with the gas outlets of the first waste gas collecting cabinet and the second waste gas collecting cabinet, and the third port of the second waste gas pipeline is communicated with the gas inlet end of the heat collector and guides the waste gas into the heat collector for secondary cooling; the end of giving vent to anger of heat collector communicates through third exhaust gas pipeline and exhaust gas purifier's inlet end to purify the processing in leading-in exhaust gas purifier with waste gas. The system provided by the invention can be used for generating power by using waste heat of the waste gas to meet self-sufficiency while purifying the waste gas, and the operation of the system is ensured without additional power supply of a ship.
Description
Technical Field
The invention relates to the technical field of marine diesel engine waste gas utilization, in particular to a marine diesel engine waste gas waste heat recycling system and a recycling method thereof.
Background
During the sailing process of the ship, the main ship engine, the ship boiler and the auxiliary ship engine are main oil consumption devices, wherein the fuel consumed by the main ship engine is the highest, the thermal efficiency of the main ship engine is generally 30% -45%, most of the rest heat is dissipated to the atmospheric environment through exhaust of a diesel engine, heat radiation, cooling media and the like, and the heat which is not fully utilized is generally called waste heat. The large-scale ship diesel engine has huge power and very much heat discharge capacity, and can effectively utilize waste gas and waste heat through ship waste heat recovery, thereby realizing energy conservation, consumption reduction and cost saving. The ship saves energy, reduces fuel consumption, improves the economy of the ship power device, and is an important task of ship building industry.
In the 21 st century, with the rapid development of shipping industry, the quantity of ships kept in China is rapidly increased, and the problem of ship emission pollution is accompanied. According to statistics of relevant departments, China ships NO every yearxThe emissions are about 1275 million tons, where countless exhaust heat is lost.
However, the existing equipment has low utilization rate of waste gas waste heat and poor treatment effect on waste gas, so that the pollution to the environment is increased, and the use is very inconvenient. Therefore, the above problems need to be solved.
Disclosure of Invention
The invention aims to solve the technical problem of providing a system for recycling waste gas waste heat of a marine diesel engine and a recycling method thereof, which can fully utilize the waste gas waste heat to generate power to meet self-sufficiency while purifying the waste gas, and does not need extra power supply of a ship to ensure the operation of the system, thereby realizing the responsibility of purifying the waste gas of the marine diesel engine and protecting the environment on the premise of saving energy of the ship.
In order to solve the technical problems, the invention adopts the following technical scheme: the invention discloses a recovery method of a marine diesel engine exhaust gas waste heat recovery and utilization system, which has the innovation points that: the recycling system comprises a first waste gas pipeline, a seawater desalination circulation loop, a first waste gas collection cabinet, a lithium bromide refrigeration circulation loop, a second waste gas collection cabinet, a second waste gas pipeline, a heat collector, a third waste gas pipeline and a waste gas purifier; the first waste gas pipeline is of a three-way structure, one port of the first waste gas pipeline is hermetically communicated with a waste gas discharge port of the marine diesel engine, the other two ports of the first waste gas pipeline are respectively hermetically communicated with a gas inlet of the first waste gas collecting cabinet and a gas inlet of the second waste gas collecting cabinet, a seawater desalination circulation loop is arranged at the first waste gas collecting cabinet in a penetrating mode, and the waste gas in the first waste gas collecting cabinet is subjected to primary cooling through the seawater desalination circulation loop; a lithium bromide refrigeration circulation loop is further arranged at the second waste gas collecting cabinet in a penetrating mode, and the waste gas in the second waste gas collecting cabinet is subjected to primary cooling through the lithium bromide refrigeration circulation loop; the second waste gas pipeline is of a three-way structure, two ports of the second waste gas pipeline are respectively communicated with the gas outlet of the first waste gas collecting cabinet and the gas outlet of the second waste gas collecting cabinet in a sealing manner, a third port of the second waste gas pipeline is communicated with the gas inlet end of the heat collector in a sealing manner, and the waste gas after primary cooling is guided into the heat collector for secondary cooling; the air outlet end of the heat collector is hermetically communicated with the air inlet end of the waste gas purifier through a third waste gas pipeline, and waste gas subjected to secondary cooling is introduced into the waste gas purifier for purification treatment and then is discharged to the outside through the air outlet end of the waste gas purifier;
the recovery method comprises the following steps:
the method comprises the following steps: firstly, dividing the waste gas into two parts through a first waste gas pipeline, wherein one part of the waste gas enters a first waste gas collecting cabinet, and the other part of the waste gas enters a second waste gas collecting cabinet;
step two: then the cold carbon dioxide is pressurized by a supercharger and then is sent into a gas storage pool to exchange heat with the waste gas in the first waste gas collecting cabinet; then the heated carbon dioxide drives a generator to generate electricity, then the electricity is sent into a condenser to exchange heat with seawater in the condenser, and the cooled carbon dioxide is sent into a supercharger to form a circulation loop;
step three: meanwhile, the condensed water is sent into a water storage tank and is subjected to heat exchange gasification with the waste gas in the second waste gas collecting cabinet to form water vapor; then the water vapor enters a lithium bromide refrigerating device to be cooled to form condensed water and form a circulation loop;
step four: the waste gas after primary cooling is conveyed into a heat collector through a second waste gas pipeline for further heat collection and power generation and is stored in a storage battery; then the storage battery drives the electric oxidation reactor to oxidize and degrade the wastewater in the domestic sewage cabin into domestic water;
step five: then the waste gas after the secondary cooling is purified in leading-in exhaust gas purifier through the motor, reaches exhaust gas purification standard after the rethread exhaust gas purifier's response lid discharges to the external world.
Preferably, the first exhaust gas collection cabinet and the second exhaust gas collection cabinet are both hollow box-shaped structures and respectively provide heat exchange spaces for exhaust gas discharged by the marine diesel engine.
Preferably, the seawater desalination circulation loop comprises a supercharger, an air storage pool, a generator, a condenser and a cold air pipeline; the gas storage pool penetrates through the first waste gas collecting cabinet, the inlet end of the gas storage pool is hermetically communicated with the outlet of the supercharger through a cold air pipeline, and cold carbon dioxide is pressurized and then sent into the gas storage pool to exchange heat with waste gas in the first waste gas collecting cabinet; the exit end of gas storage pool in proper order through air conditioning pipeline, generator with the sealed intercommunication of the entrance point of condenser to carbon dioxide after will heating carries out the heat exchange in sending into the condenser, the exit end of condenser pass through the air conditioning pipeline with the sealed intercommunication of the import of booster, and in sending into the booster with the carbon dioxide after cooling, and form circulation circuit.
Preferably, a reverse osmosis membrane is arranged in the condenser, an inlet of the condenser is communicated with seawater through a water pump, the seawater is pumped into the condenser to exchange heat with the heated carbon dioxide, and then seawater desalination is realized through the reverse osmosis membrane to form fresh water and brine.
Preferably, the lithium bromide refrigeration cycle loop comprises a lithium bromide refrigeration device, a water pipe and a water storage tank; the water storage tank penetrates through the second waste gas collecting cabinet, the inlet end of the water storage tank is hermetically communicated with the outlet of the lithium bromide refrigerating device through a water pipe, and condensed water is sent into the water storage tank and is subjected to heat exchange gasification with waste gas in the second waste gas collecting cabinet to form water vapor; the outlet end of the water storage tank is communicated with the inlet of the lithium bromide refrigerating device in a sealing mode through a water pipe, and water vapor is cooled to form condensed water and form a circulating loop.
Preferably, the device further comprises an electrooxidation device, and the electrooxidation device comprises a cable, a storage battery and an electrooxidation reactor; the heat collector is electrically connected with the storage battery through a cable, and the waste gas after primary cooling is conveyed into the heat collector through a second waste gas pipeline for further heat collection and power generation and is stored in the storage battery; the storage battery is electrically connected with the electrooxidation reactor through a cable, the electrooxidation reactor is arranged in a domestic sewage cabin of the ship, and waste water in the domestic sewage cabin is oxidized and degraded into domestic water through the electrooxidation reactor.
Preferably, the device further comprises a motor; still be equipped with the motor on third exhaust gas line, the power supply of motor by battery in the heat collector provides, and the waste gas after will the secondary cooling through the motor is leading-in the exhaust gas purifier.
Preferably, exhaust gas purifier's the end of giving vent to anger still is equipped with the response lid, just exhaust gas purifier's the end of giving vent to anger is through response lid and external intercommunication.
The invention has the beneficial effects that:
(1) the system can fully utilize waste gas waste heat to generate power to meet self-sufficiency while purifying the waste gas, and does not need extra power supply of the ship to ensure the operation of the system, thereby realizing the responsibility of purifying the waste gas of the diesel engine of the ship and protecting the environment on the premise of saving energy of the ship;
(2) the invention can provide cold air for the life and daily life of the crewman, greatly improve the life quality of the crewman on the ship, reduce the opening times of the crewman's cabin air conditioner, thus has saved the ship power supply;
(3) the cold air provided by the invention can refrigerate part of the area of the ship engine, thereby prolonging the service life of the ship engine and saving the cost;
(4) the invention can provide fresh water for the ship, thereby reducing the running cost of the ship to a certain extent;
(5) the invention uses the electrooxidation reactor to oxidize and degrade the waste water in the domestic sewage tank into domestic water, thereby realizing water circulation.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments are briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a marine diesel engine exhaust gas waste heat recycling system of the present invention.
Wherein, 1 — a first exhaust gas conduit; 2-a supercharger; 3-a gas storage pool; 4-a first exhaust gas collection cabinet; 5-a generator; 6-a condenser; 7-a cold air duct; 8-lithium bromide refrigeration equipment; 9-a water pipe; 10-a water storage tank; 11-a second exhaust gas collection cabinet; 12-a second exhaust gas conduit; 13-a heat collector; 14-a third exhaust gas conduit; 15-a motor; 16-a waste gas purifier; 17-an induction cover; 18-a cable; 19-a battery; 20-an electrooxidation reactor; 21-domestic sewage tank.
Detailed Description
The technical solution of the present invention will be clearly and completely described by the following detailed description.
The invention relates to a waste gas waste heat recycling system of a marine diesel engine, which comprises a first waste gas pipeline 1, a seawater desalination circulation loop, a first waste gas collection cabinet 4, a lithium bromide refrigeration circulation loop, a second waste gas collection cabinet 11, a second waste gas pipeline 12, a heat collector 13, a third waste gas pipeline 14 and a waste gas purifier 16, wherein the first waste gas pipeline is connected with a seawater desalination circulation loop; the specific structure is as shown in fig. 1, a first exhaust gas pipeline 1 is in a three-way structure, one port of the first exhaust gas pipeline is hermetically communicated with an exhaust gas discharge port of a marine diesel engine, the other two ports of the first exhaust gas pipeline 1 are respectively hermetically communicated with an air inlet of a first exhaust gas collection cabinet 4 and an air inlet of a second exhaust gas collection cabinet 11, a seawater desalination circulation loop is further arranged at the first exhaust gas collection cabinet 4 in a penetrating manner, and the exhaust gas in the first exhaust gas collection cabinet 4 is subjected to primary cooling through the seawater desalination circulation loop; the first exhaust gas collecting cabinet 4 and the second exhaust gas collecting cabinet 11 are both hollow box-shaped structures and respectively provide heat exchange spaces for exhaust gas discharged by the marine diesel engine.
The seawater desalination circulation loop comprises a supercharger 2, a gas storage pool 3, a generator 5, a condenser 6 and a cold air pipeline 7; as shown in fig. 1, the gas storage tank 3 penetrates the first exhaust gas collection tank 4, and the inlet end of the gas storage tank is hermetically communicated with the outlet of the supercharger 2 through a cold air pipeline 7, and the cold carbon dioxide is pressurized and then sent into the gas storage tank 3 to exchange heat with the exhaust gas in the first exhaust gas collection tank 4; the outlet end of the gas storage pool 3 is sequentially communicated with the inlet end of the condenser 6 through the cold air pipeline 7 and the generator 5 in a sealing manner, the heated carbon dioxide is sent into the condenser 6 for heat exchange, the outlet end of the condenser 6 is communicated with the inlet of the supercharger 2 through the cold air pipeline 7 in a sealing manner, the cooled carbon dioxide is sent into the supercharger 2, and a circulation loop is formed. Wherein, the heated carbon dioxide drives the generator 5 to generate power, so as to supply power to various small-scale domestic electrical appliances and realize self-sufficiency. In the invention, after the carbon dioxide is pressurized by the supercharger 2, the distance of gas molecules is reduced, and the heat absorption process can be accelerated.
As shown in fig. 1, a reverse osmosis membrane is arranged in the condenser 6, an inlet of the condenser 6 is communicated with seawater through a water pump, the seawater is pumped into the condenser 6 to exchange heat with heated carbon dioxide, and then the seawater is desalinated through the reverse osmosis membrane to form fresh water and brine, and the fresh water can become domestic water after sterilization treatment.
In the invention, a lithium bromide refrigeration circulation loop is also arranged at the second waste gas collecting cabinet 11 in a penetrating way, and the waste gas in the second waste gas collecting cabinet 11 is subjected to primary cooling through the lithium bromide refrigeration circulation loop; wherein, the lithium bromide refrigeration cycle loop comprises a lithium bromide refrigeration device 8, a water pipe 9 and a water storage tank 10; as shown in fig. 1, the water storage tank 10 penetrates through the second exhaust gas collection cabinet 11, and the inlet end of the water storage tank is hermetically communicated with the outlet of the lithium bromide refrigeration device 8 through a water pipe 9, and condensed water is sent into the water storage tank 10 to exchange heat with the exhaust gas in the second exhaust gas collection cabinet 11 and be gasified to form water vapor; the outlet end of the water storage tank 10 is hermetically communicated with the inlet of the lithium bromide refrigerating device 8 through a water pipe 9, and the water vapor is cooled to form condensed water and form a circulation loop. The lithium bromide refrigerating device 8 utilizes the heat of the water vapor to generate cold air, and firstly, the cold air serves as an air conditioner; secondly, the shelf life of a certain amount of food is prolonged; thirdly, the local area of the engine is cooled, and the service life is prolonged.
The second waste gas pipeline 12 is in a three-way structure, two ports of the second waste gas pipeline are respectively communicated with the gas outlet of the first waste gas collecting cabinet 4 and the gas outlet of the second waste gas collecting cabinet 11 in a sealing manner, a third port of the second waste gas pipeline 12 is communicated with the gas inlet end of the heat collector 13 in a sealing manner, and the waste gas after primary temperature reduction is guided into the heat collector 13 for secondary temperature reduction; as shown in fig. 1, the electrooxidation apparatus includes a cable 18, a storage battery 19, and an electrooxidation reactor 20; the heat collector 13 is electrically connected with the storage battery 19 through a cable 18, and the waste gas after primary cooling is conveyed into the heat collector 13 through the second waste gas pipeline 12 for further heat collection and power generation and is stored in the storage battery 19; the storage battery 19 is electrically connected with the electrooxidation reactor 20 through a cable 18, the electrooxidation reactor 20 is arranged in a domestic sewage tank 21 of the ship, and wastewater in the domestic sewage tank 21 is oxidized and degraded into domestic water through the electrooxidation reactor 20. The storage battery can supply power for the illumination of the ship and the system.
The air outlet end of the heat collector 13 is hermetically communicated with the air inlet end of the waste gas purifier 16 through a third waste gas pipeline 14, and waste gas after secondary temperature reduction is led into the waste gas purifier 16 for purification treatment and then is discharged to the outside through the air outlet end of the waste gas purifier 16; as shown in fig. 1, a motor 15 is further disposed on the third exhaust gas duct 14, power supply of the motor 15 is provided by a storage battery in the heat collector 13, and the exhaust gas after secondary temperature reduction is introduced into the exhaust gas purifier 16 through the motor 15; an induction cover 17 is arranged at the air outlet end of the waste gas purifier 16, and the air outlet end of the waste gas purifier 16 is communicated with the outside through the induction cover 17; and when the waste gas after the secondary temperature reduction is purified to reach the waste gas purification standard, the waste gas is discharged to the outside through the induction cover 17 of the waste gas purifier 16.
The invention discloses a recovery method of a marine diesel engine exhaust gas waste heat recovery and utilization system, which comprises the following steps:
the method comprises the following steps: firstly, the waste gas is divided into two parts through a first waste gas pipeline 1, one part of the waste gas enters a first waste gas collecting cabinet 4, and the other part of the waste gas enters a second waste gas collecting cabinet 11;
step two: then the cold carbon dioxide is pressurized by the supercharger 2 and then sent into the gas storage pool 3 to exchange heat with the waste gas in the first waste gas collecting cabinet 4; then the heated carbon dioxide drives a generator 5 to generate electricity, then the electricity is sent into a condenser 6 to exchange heat with seawater in the condenser 6, and the cooled carbon dioxide is sent into a supercharger 2 to form a circulation loop;
step three: meanwhile, the condensed water is sent into the water storage tank 10 and is subjected to heat exchange gasification with the waste gas in the second waste gas collecting cabinet 11 to form water vapor; then the water vapor enters a lithium bromide refrigerating device 8 to be cooled to form condensed water and form a circulation loop;
step four: the waste gas after primary cooling is conveyed into a heat collector through a second waste gas pipeline for further heat collection and power generation and is stored in a storage battery; then the storage battery drives the electric oxidation reactor to oxidize and degrade the wastewater in the domestic sewage cabin into domestic water;
in the above steps, under the current action of the storage battery, hydroxyl free radicals and activated oxygen free radicals are generated by special electrodes in the electrooxidation reactor; because the two free radicals have super strong oxidizing capability, when the wastewater flows through the electro-oxidation reactor, organic pollutants in the wastewater are oxidized and degraded until the organic pollutants are changed into inorganic matters (such as carbon dioxide and water); thereby realizing water circulation;
step five: then the waste gas after the secondary cooling is led into the waste gas purifier 16 through the motor 15 for purification treatment, and is discharged to the outside through the induction cover 17 of the waste gas purifier 16 after reaching the waste gas purification standard.
The invention has the beneficial effects that:
(1) the system can fully utilize waste gas waste heat to generate power to meet self-sufficiency while purifying the waste gas, and does not need extra power supply of the ship to ensure the operation of the system, thereby realizing the responsibility of purifying the waste gas of the diesel engine of the ship and protecting the environment on the premise of saving energy of the ship;
(2) the invention can provide cold air for the life and daily life of the crewman, greatly improve the life quality of the crewman on the ship, reduce the opening times of the crewman's cabin air conditioner, thus has saved the ship power supply;
(3) the cold air provided by the invention can refrigerate part of the area of the ship engine, thereby prolonging the service life of the ship engine and saving the cost;
(4) the invention can provide fresh water for the ship, thereby reducing the running cost of the ship to a certain extent;
(5) the invention uses the electrooxidation reactor to oxidize and degrade the waste water in the domestic sewage tank into domestic water, thereby realizing water circulation.
The above-mentioned embodiments are merely descriptions of the preferred embodiments of the present invention, and do not limit the concept and scope of the present invention, and various modifications and improvements made to the technical solutions of the present invention by those skilled in the art should fall into the protection scope of the present invention without departing from the design concept of the present invention, and the technical contents of the present invention as claimed are all described in the technical claims.
Claims (8)
1. A recovery method of a marine diesel engine exhaust gas waste heat recovery and utilization system is characterized by comprising the following steps: the recycling system comprises a first waste gas pipeline, a seawater desalination circulation loop, a first waste gas collection cabinet, a lithium bromide refrigeration circulation loop, a second waste gas collection cabinet, a second waste gas pipeline, a heat collector, a third waste gas pipeline and a waste gas purifier; the first waste gas pipeline is of a three-way structure, one port of the first waste gas pipeline is hermetically communicated with a waste gas discharge port of the marine diesel engine, the other two ports of the first waste gas pipeline are respectively hermetically communicated with a gas inlet of the first waste gas collecting cabinet and a gas inlet of the second waste gas collecting cabinet, a seawater desalination circulation loop is arranged at the first waste gas collecting cabinet in a penetrating mode, and the waste gas in the first waste gas collecting cabinet is subjected to primary cooling through the seawater desalination circulation loop; a lithium bromide refrigeration circulation loop is further arranged at the second waste gas collecting cabinet in a penetrating mode, and the waste gas in the second waste gas collecting cabinet is subjected to primary cooling through the lithium bromide refrigeration circulation loop; the second waste gas pipeline is of a three-way structure, two ports of the second waste gas pipeline are respectively communicated with the gas outlet of the first waste gas collecting cabinet and the gas outlet of the second waste gas collecting cabinet in a sealing manner, a third port of the second waste gas pipeline is communicated with the gas inlet end of the heat collector in a sealing manner, and the waste gas after primary cooling is guided into the heat collector for secondary cooling; the air outlet end of the heat collector is hermetically communicated with the air inlet end of the waste gas purifier through a third waste gas pipeline, and waste gas subjected to secondary cooling is introduced into the waste gas purifier for purification treatment and then is discharged to the outside through the air outlet end of the waste gas purifier;
the recovery method comprises the following steps:
the method comprises the following steps: firstly, dividing the waste gas into two parts through a first waste gas pipeline, wherein one part of the waste gas enters a first waste gas collecting cabinet, and the other part of the waste gas enters a second waste gas collecting cabinet;
step two: then the cold carbon dioxide is pressurized by a supercharger and then is sent into a gas storage pool to exchange heat with the waste gas in the first waste gas collecting cabinet; then the heated carbon dioxide drives a generator to generate electricity, then the electricity is sent into a condenser to exchange heat with seawater in the condenser, and the cooled carbon dioxide is sent into a supercharger to form a circulation loop;
step three: meanwhile, the condensed water is sent into a water storage tank and is subjected to heat exchange gasification with the waste gas in the second waste gas collecting cabinet to form water vapor; then the water vapor enters a lithium bromide refrigerating device to be cooled to form condensed water and form a circulation loop;
step four: the waste gas after primary cooling is conveyed into a heat collector through a second waste gas pipeline for further heat collection and power generation and is stored in a storage battery; then the storage battery drives the electric oxidation reactor to oxidize and degrade the wastewater in the domestic sewage cabin into domestic water;
step five: then the waste gas after the secondary cooling is purified in leading-in exhaust gas purifier through the motor, reaches exhaust gas purification standard after the rethread exhaust gas purifier's response lid discharges to the external world.
2. The recycling method of the marine diesel engine exhaust gas waste heat recycling system according to claim 1, characterized in that: the first waste gas collecting cabinet and the second waste gas collecting cabinet are both hollow box-shaped structures and respectively provide heat exchange spaces for waste gas discharged by the marine diesel engine.
3. The recycling method of the marine diesel engine exhaust gas waste heat recycling system according to claim 1, characterized in that: the seawater desalination circulation loop comprises a supercharger, an air storage pool, a generator, a condenser and a cold air pipeline; the gas storage pool penetrates through the first waste gas collecting cabinet, the inlet end of the gas storage pool is hermetically communicated with the outlet of the supercharger through a cold air pipeline, and cold carbon dioxide is pressurized and then sent into the gas storage pool to exchange heat with waste gas in the first waste gas collecting cabinet; the exit end of gas storage pool in proper order through air conditioning pipeline, generator with the sealed intercommunication of the entrance point of condenser to carbon dioxide after will heating carries out the heat exchange in sending into the condenser, the exit end of condenser pass through the air conditioning pipeline with the sealed intercommunication of the import of booster, and in sending into the booster with the carbon dioxide after cooling, and form circulation circuit.
4. The recycling method of the marine diesel engine exhaust gas waste heat recycling system according to claim 3, characterized in that: the condenser is internally provided with a reverse osmosis membrane, the inlet of the condenser is communicated with seawater through a water pump, seawater is pumped into the condenser to exchange heat with heated carbon dioxide, and then seawater desalination is realized through the reverse osmosis membrane to form fresh water and brine.
5. The recycling method of the marine diesel engine exhaust gas waste heat recycling system according to claim 1, characterized in that: the lithium bromide refrigeration circulation loop comprises a lithium bromide refrigeration device, a water pipe and a water storage tank; the water storage tank penetrates through the second waste gas collecting cabinet, the inlet end of the water storage tank is hermetically communicated with the outlet of the lithium bromide refrigerating device through a water pipe, and condensed water is sent into the water storage tank and is subjected to heat exchange gasification with waste gas in the second waste gas collecting cabinet to form water vapor; the outlet end of the water storage tank is communicated with the inlet of the lithium bromide refrigerating device in a sealing mode through a water pipe, and water vapor is cooled to form condensed water and form a circulating loop.
6. The recycling method of the marine diesel engine exhaust gas waste heat recycling system according to claim 1, characterized in that: the device also comprises an electrooxidation device, wherein the electrooxidation device comprises a cable, a storage battery and an electrooxidation reactor; the heat collector is electrically connected with the storage battery through a cable, and the waste gas after primary cooling is conveyed into the heat collector through a second waste gas pipeline for further heat collection and power generation and is stored in the storage battery; the storage battery is electrically connected with the electrooxidation reactor through a cable, the electrooxidation reactor is arranged in a domestic sewage cabin of the ship, and waste water in the domestic sewage cabin is oxidized and degraded into domestic water through the electrooxidation reactor.
7. The recycling method of the marine diesel engine exhaust gas waste heat recycling system according to claim 6, characterized in that: the device also comprises a motor; still be equipped with the motor on third exhaust gas line, the power supply of motor by battery in the heat collector provides, and the waste gas after will the secondary cooling through the motor is leading-in the exhaust gas purifier.
8. The recycling method of the marine diesel engine exhaust gas waste heat recycling system according to claim 7, characterized in that: exhaust gas purifier's the end of giving vent to anger still is equipped with the response lid, just exhaust gas purifier's the end of giving vent to anger is through response lid and external intercommunication.
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