CN116816649A - Underwater compressed air energy storage cold-hot water poly-generation system - Google Patents

Underwater compressed air energy storage cold-hot water poly-generation system Download PDF

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Publication number
CN116816649A
CN116816649A CN202311031311.XA CN202311031311A CN116816649A CN 116816649 A CN116816649 A CN 116816649A CN 202311031311 A CN202311031311 A CN 202311031311A CN 116816649 A CN116816649 A CN 116816649A
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heat
heat exchanger
gas
hot
air
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CN116816649B (en
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赵鲁梅
钱作勤
王强
黎昌裔
王昕宇
张志成
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Sanya Science and Education Innovation Park of Wuhan University of Technology
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Sanya Science and Education Innovation Park of Wuhan University of Technology
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B41/00Pumping installations or systems specially adapted for elastic fluids
    • F04B41/02Pumping installations or systems specially adapted for elastic fluids having reservoirs
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10JPRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J3/00Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10JPRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J3/00Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
    • C10J3/46Gasification of granular or pulverulent flues in suspension
    • C10J3/463Gasification of granular or pulverulent flues in suspension in stationary fluidised beds
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01KSTEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K25/00Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
    • F01K25/08Plants 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
    • F01K25/10Plants 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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01KSTEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K27/00Plants for converting heat or fluid energy into mechanical energy, not otherwise provided for
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02BINTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B43/00Engines characterised by operating on gaseous fuels; Plants including such engines
    • F02B43/10Engines or plants characterised by use of other specific gases, e.g. acetylene, oxyhydrogen
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02BINTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B63/00Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices
    • F02B63/04Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices for electric generators
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/02Air cleaners
    • F02M35/024Air cleaners using filters, e.g. moistened
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B35/00Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
    • F04B35/04Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22STEAM GENERATION
    • F22BMETHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B1/00Methods of steam generation characterised by form of heating method
    • F22B1/02Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
    • F22B1/06Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being molten; Use of molten metal, e.g. zinc, as heat transfer medium
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22STEAM GENERATION
    • F22BMETHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B33/00Steam-generation plants, e.g. comprising steam boilers of different types in mutual association
    • F22B33/18Combinations of steam boilers with other apparatus
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24SSOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S60/00Arrangements for storing heat collected by solar heat collectors
    • F24S60/30Arrangements for storing heat collected by solar heat collectors storing heat in liquids
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10JPRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00Details of gasification processes
    • C10J2300/09Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
    • C10J2300/0903Feed preparation
    • C10J2300/0906Physical processes, e.g. shredding, comminuting, chopping, sorting
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10JPRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00Details of gasification processes
    • C10J2300/09Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
    • C10J2300/0903Feed preparation
    • C10J2300/0909Drying
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10JPRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00Details of gasification processes
    • C10J2300/09Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
    • C10J2300/0913Carbonaceous raw material
    • C10J2300/0916Biomass
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10JPRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00Details of gasification processes
    • C10J2300/09Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
    • C10J2300/0953Gasifying agents
    • C10J2300/0956Air or oxygen enriched air
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10JPRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00Details of gasification processes
    • C10J2300/09Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
    • C10J2300/0953Gasifying agents
    • C10J2300/0973Water
    • C10J2300/0976Water as steam
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10JPRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00Details of gasification processes
    • C10J2300/16Integration of gasification processes with another plant or parts within the plant
    • C10J2300/164Integration of gasification processes with another plant or parts within the plant with conversion of synthesis gas
    • C10J2300/1643Conversion of synthesis gas to energy
    • C10J2300/165Conversion of synthesis gas to energy integrated with a gas turbine or gas motor
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10JPRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00Details of gasification processes
    • C10J2300/16Integration of gasification processes with another plant or parts within the plant
    • C10J2300/1671Integration of gasification processes with another plant or parts within the plant with the production of electricity
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10JPRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00Details of gasification processes
    • C10J2300/16Integration of gasification processes with another plant or parts within the plant
    • C10J2300/1681Integration of gasification processes with another plant or parts within the plant with biological plants, e.g. involving bacteria, algae, fungi
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10JPRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00Details of gasification processes
    • C10J2300/16Integration of gasification processes with another plant or parts within the plant
    • C10J2300/1693Integration of gasification processes with another plant or parts within the plant with storage facilities for intermediate, feed and/or product
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02GHOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
    • F02G5/00Profiting from waste heat of combustion engines, not otherwise provided for
    • F02G5/02Profiting from waste heat of exhaust gases

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engine Equipment That Uses Special Cycles (AREA)

Abstract

The invention discloses an underwater compressed air energy storage cold and hot water poly-generation system which comprises a seaweed biomass pretreatment subsystem, a seaweed biomass gasification purification subsystem, an internal combustion engine subsystem, an underwater compressed air energy storage subsystem, a compressed heat storage subsystem, a solar heat collector/storage subsystem and a waste heat utilization subsystem. According to the invention, redundant ocean renewable energy power is stored in a compressed air mode, and the ocean renewable energy device and seaweed biomass are gasified to generate power in the peak of electricity consumption, and then high-pressure air is expanded to do work to generate power in the peak of electricity consumption, so that the power requirement of a user is met; the waste heat utilization subsystem utilizes the waste heat of different parts of the integrated system to generate cold energy, fresh water and hot water, so as to meet the cold and hot water demands of users; the seaweed biomass gasification subsystem conveys biomass gas to a gas supply pipe network to provide cooking gas for users, so that the gas requirements of the users are met.

Description

Underwater compressed air energy storage cold-hot water poly-generation system
Technical Field
The invention relates to the technical field of renewable energy sources and energy storage, in particular to an underwater compressed air energy storage cold-hot water poly-generation system.
Background
The new energy is developed, the energy transformation is realized, the consumption of fossil energy is reduced, a green low-carbon energy system is constructed, and the method is one of important actions for reducing carbon dioxide emission and realizing global carbon neutralization. Marine renewable energy (generally referred to as wave energy, tidal current energy, temperature differential energy, and salt differential energy; more broadly, it also includes marine biomass energy, and offshore wind energy and offshore solar energy that utilize the ocean surface) that is natural, clean, renewable, predictable, and reliable as an energy characteristic will be an important alternative energy source during energy conversion transitions.
According to the report of the international renewable energy resource agency (IRENA) published on the blue economic development of the assistance of renewable energy resources at sea, the total power generation potential of all ocean energy resource technologies is 45000-130000 TWh, which means that ocean energy resources can meet more than twice of the current global power requirements. However, the ocean energy has the problems of high development difficulty, low energy density, poor stability, uneven distribution and the like, and one of the effective ways is to develop a proper energy storage technology. Compressed air energy storage has become one of the most widely studied energy storage technologies for storing renewable energy in the ocean. The underwater compressed air energy storage system utilizing the hydrostatic pressure has the advantages of high efficiency (71%) and high energy density, is suitable for energy storage in coastline/deep sea areas, and is one of the most promising methods of the isobaric compressed air energy storage system.
The ocean islands are rich in renewable energy sources such as light, wind, marine biomass, waves and the like. However, the ocean islands still basically rely on diesel engines and gas turbines to generate power at present, so that the problems of high power generation cost, high emission, high pollution, incapability of bearing large-scale loads and the like exist, and sustainable development of the ocean islands is not facilitated. The ocean island/ocean platform comprehensive energy supply system capable of independently and stably operating is established by effectively utilizing ocean renewable energy around the ocean island and converting the ocean renewable energy into composite resources such as electric power, fresh water, energy storage, cold energy, heat, fuel gas and the like, and energy guarantee is provided for ocean island/ocean platform construction with different function positioning such as resident, tourism application, fishery application, transit base application, national defense application and the like.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides an underwater compressed air energy storage cold and hot water cogeneration system based on ocean renewable energy, which combines the comprehensive power generation of ocean renewable energy rich around ocean islands, the gasification of integrated system waste heat to generate cold and hot water and seaweed biomass to generate cooking gas, thereby meeting the cold, hot, electric, water and gas requirements of users and improving the comprehensive utilization efficiency of energy.
In order to achieve the above object, the present invention provides an underwater compressed air energy storage cold-hot water poly-generation system, comprising:
seaweed biomass pretreatment subsystem: the method is used for carrying out shaping treatment on the dried seaweed biomass raw material;
the seaweed biomass gasification purification subsystem: the method comprises the steps of gasifying seaweed biomass briquette fuel to generate seaweed biomass synthetic gas, purifying and storing the seaweed biomass synthetic gas, and conveying the seaweed biomass synthetic gas to an external pipe network;
an internal combustion engine subsystem: the engine is driven by the seaweed biomass synthesis gas to generate electricity;
an underwater compressed air energy storage subsystem: the device is used for storing redundant ocean renewable energy power when the power consumption is low, and releasing high-pressure air to expand to do work and generate power when the power consumption is high;
compression heat storage subsystem: the device is used for recovering and storing sensible heat contained in the compressed air by utilizing the heat conduction oil, and heating the air and fresh water by utilizing the heat conduction oil;
solar collector/storage subsystem: the solar energy storage device is used for storing solar energy by using molten salt, and heating high-pressure low-temperature air and heating fresh water by using hot molten salt to generate steam;
and the waste heat utilization subsystem: the system is used for generating cold energy, fresh water and hot water by utilizing the waste heat of different subsystems;
The seaweed biomass pretreatment subsystem, the seaweed biomass gasification purification subsystem, the internal combustion engine subsystem, the underwater compressed air energy storage subsystem, the compressed heat storage subsystem, the solar heat collector/storage subsystem and the waste heat utilization subsystem are sequentially connected.
Preferably, the seaweed biomass pretreatment subsystem comprises a hot air dryer and a curing and forming device; the hot air dryer is used for drying the seaweed biomass raw material by utilizing hot air in the compression heat storage subsystem, and the solidification forming equipment is used for forming the dried seaweed biomass raw material.
Preferably, the seaweed biomass gasification purification subsystem comprises a biomass preheater, a fluidized bed gasifier, a crude gas cooler, a purification and dust removal device, a Roots blower, a safe water seal and a gas storage tank;
the biomass preheater, the fluidized bed gasifier, the crude gas cooler, the purifying and dedusting device, the Roots blower, the safe water seal device and the gas storage tank are connected in sequence;
The biomass preheater is used for preheating the seaweed biomass briquette fuel by using hot air in the oil heat exchanger;
the raw gas cooler is used for heating air serving as a gasifying agent by utilizing the waste heat of the synthesis gas at the outlet of the fluidized bed gasifier, wherein the gasifying agent is air-water vapor gasifying agent by utilizing water vapor generated by a molten salt hot vapor generator and hot air generated by the raw gas cooler in a preset mass ratio;
the seaweed biomass synthesis gas in the gas storage tank is respectively conveyed to a gas supply pipe network and the internal combustion engine subsystem, and the seaweed biomass synthesis gas conveyed to the gas supply pipe network is used for providing cooking gas and gas for power generation of the gas internal combustion engine; the seaweed biomass synthesis gas conveyed into the internal combustion engine subsystem is combusted in the internal combustion engine, and heat released after combustion of the seaweed biomass synthesis gas comprises high-temperature flue gas and recirculated cylinder liner water.
Preferably, the internal combustion engine subsystem comprises an air filter, a gas internal combustion engine and a generator; wherein the air filter and the generator are respectively connected with the gas internal combustion engine;
the air filter is used for filtering particulate impurities in the air;
The gas internal combustion engine is used for mixing seaweed biomass synthetic gas at the outlet of the gas storage tank and air at the outlet of the air filter according to a preset proportion to form mixed fuel, and converting chemical energy of the fuel into kinetic energy;
the generator drives the generator to rotate by utilizing the crankshaft of the gas internal combustion engine, and converts kinetic energy into electric energy.
Preferably, the underwater compressed air energy storage subsystem comprises an air compressor, a check valve, a flexible gas storage device, a pressure regulating valve, an air expander and a first reflux heat exchanger; the air expander is connected with the first reflux heat exchanger, the flexible gas storage device is respectively connected with the check valve and the pressure regulating valve, the check valve is connected with the final stage aftercooler of the compressor, and the pressure regulating valve is connected with the first reflux heat exchanger;
the heat recovery device comprises a flexible gas storage device, a heat recovery device and a heat recovery device, wherein the heat recovery device is used for preheating air flowing out of the flexible gas storage device; the air compressor is used for electrically driving by using ocean renewable energy sources;
the air compressor comprises three turbines connected in parallel, wherein the turbines comprise a first-stage compressor, a second-stage compressor and a third-stage compressor; the air compressor is used for improving compression efficiency by adopting a three-stage compression and interstage and final stage cooling method;
The air expander comprises a first-stage expander, a second-stage expander and a third-stage expander, and the air expander adopts a three-stage expansion and intermediate heating method for improving the power generation efficiency.
Preferably, the compression heat storage subsystem comprises a compressor inter-stage cooler, a compressor final stage aftercooler, a hot oil tank, a hot oil pump, an oil heat exchanger, a cold oil tank and a cold oil pump;
the compressor inter-stage cooler comprises a first cooler and a second cooler, the oil heat exchanger comprises a first oil heat exchanger and a second oil heat exchanger, and the compressor final stage aftercooler, the compressor inter-stage cooler and the oil heat exchanger are all compact tube fin heat exchangers;
the cold oil tank, the cold oil pump, the compressor inter-stage cooler, the hot oil tank, the hot oil pump and the oil heat exchanger are sequentially connected, wherein the first cooler and the second cooler are connected in parallel, the compressor inter-stage cooler and the hot oil tank are respectively connected with the final stage aftercooler of the compressor in parallel, and the first oil heat exchanger and the second oil heat exchanger are connected in parallel;
sensible heat contained in the air in the compression heat storage subsystem after passing through the air compressor is recovered and stored through the hot oil tank; the hot oil in the hot oil tank enters an oil heat exchanger, and air heated by the first oil heat exchanger is respectively used as a hot air source of a hot air dryer and preheating of the seaweed biomass briquette fuel feed of the fluidized bed gasifier; fresh water heated by the second oil heat exchanger enters a heat recovery steam generator.
Preferably, the solar collector/storage subsystem comprises a solar collector, a hot salt tank, a molten salt heat exchanger, a molten salt hot steam generator, a cold salt tank and a molten salt pump;
the molten salt pump comprises a cold salt pump and a hot salt pump; the molten salt heat exchanger comprises a first molten salt heat exchanger, a second molten salt heat exchanger and a third molten salt heat exchanger, and the molten salt heat exchanger and the molten salt heat steam generator both adopt compact tube fin heat exchangers;
the solar heat collector, the hot salt tank, the hot salt pump, the molten salt heat exchanger, the cold salt tank and the cold salt pump are sequentially connected, wherein the molten salt heat exchanger and the cold salt tank are respectively connected with the molten salt hot steam generator in parallel, and the first molten salt heat exchanger, the second molten salt heat exchanger and the third molten salt heat exchanger are connected in parallel;
the solar heat collector utilizes solar energy to heat molten salt entering through the cold salt pump, the heated molten salt is respectively stored in the hot salt tank, the heated molten salt enters into the molten salt heat exchanger through the hot salt pump to heat air and enters into the molten salt heat steam generator to heat fresh water to generate steam, and the molten salt after heat release is stored in the cold salt tank.
Preferably, the waste heat utilization subsystem comprises a recirculating cylinder sleeve water unit, a flue gas heat storage unit, an organic Rankine cycle and injector cycle unit, a low-temperature multi-effect distillation sea water desalination unit and a steam heat utilization unit;
the recirculating cylinder sleeve water unit is respectively connected with the gas internal combustion engine and a heat preservation water tank in the waste heat utilization subsystem; the flue gas heat storage unit is respectively connected with the organic Rankine cycle and ejector cycle unit, the low-temperature multi-effect distillation sea water desalination unit and the heat preservation water tank, and the steam heat utilization unit is connected with a molten salt heat steam generator in the solar heat collector/storage subsystem;
the flue gas heat storage unit comprises a first heat recovery steam generator, a second heat recovery steam generator and a flue gas/water heat exchanger, and the steam heat utilization unit comprises a lithium bromide absorption refrigeration unit and a plate heat exchanger;
the waste heat of the flue gas heat storage unit flows into the organic Rankine cycle and the ejector cycle unit to drive ORC cycle power generation and injection refrigeration cycle to generate cold energy; then, the low-grade flue gas at the outlet of the first heat recovery steam generator, the crude gas cooler, hot air at the outlet of the first reflux heat exchanger and hot water at the outlet of the second oil heat exchanger flow into the second heat recovery steam generator to drive the low-temperature multi-effect distillation sea water desalination unit to produce fresh water, and flue gas waste heat at the outlet of the second heat recovery steam generator drives the flue gas/water heat exchanger to produce hot water;
And the steam of the steam heat utilization unit drives the lithium bromide absorption refrigeration unit to generate cold energy in summer, and the plate heat exchanger is utilized to supply heat load to users in non-summer.
Preferably, the organic rankine cycle and the ejector cycle units comprise an organic rankine cycle subunit and an ejector cycle subunit, the organic rankine cycle subunit being connected to the flue gas heat storage unit and the ejector cycle subunit, respectively;
the organic Rankine cycle subunit comprises a turbine, a first condenser, a first working medium pump, a second reflux heat exchanger and a first heat exchanger; the turbine, the first heat exchanger, the second reflux heat exchanger, the first condenser and the first working medium pump are sequentially connected;
the ejector circulation subunit comprises a second heat exchanger, an ejector, an evaporator, an expansion valve, a second condenser and a second working medium pump; the second heat exchanger, the ejector, the evaporator, the expansion valve and the second working medium pump are sequentially connected, and the expansion valve and the second working medium pump are respectively connected with the second condenser in parallel;
the organic Rankine cycle subunit utilizes the first heat recovery steam generator to recover heat of flue gas exhausted by the gas internal combustion engine, organic fluid is converted into saturated steam and then expands in a turbine to generate power to drive a generator to generate electricity, toluene steam at an outlet of the turbine is used for recovering energy of the toluene steam through the first heat exchanger, the second heat return exchanger is used for heating residual energy to an inlet flow of the first heat recovery steam generator, and the organic fluid is returned to the first heat recovery steam generator again after passing through the first condenser and the first working medium pump;
The ejector circulation subunit utilizes the heat of the superheated flow at the outlet of the turbine to evaporate liquid refrigerant, and the refrigerant steam and the refrigerant flow carried out from the evaporator as power flow by the refrigerant steam are mixed in the ejector and then flow to the condenser II, and the heat is released to cooling water and then condensed; the refrigerant concentrated flow of the condenser is divided into two flows, one part of the refrigerant concentrated flow is expanded in the expansion valve and then is vaporized in the evaporator through absorbing heat from a cooling medium to generate cold energy, and the other part of the refrigerant concentrated flow is pumped back to the heat exchanger by the working medium pump II to form primary air flow.
Compared with the prior art, the invention has the following advantages and technical effects:
1. according to the ocean island energy-saving device, abundant ocean renewable energy resources such as wind energy, solar energy, seaweed biomass energy and wave energy around the ocean island are fully utilized according to local conditions, and redundant ocean renewable energy power is stored in a compressed air mode when electricity consumption is low, so that the ocean renewable energy is deeply integrated and coupled, the efficient utilization of the ocean renewable energy is realized, fossil energy consumption is reduced, and environmental pollution is avoided;
2. according to the invention, the waste heat of different parts of the integrated system is fully utilized, and electric energy, cold energy, fresh water, heating or domestic hot water is generated through an Organic Rankine Cycle (ORC), an ejector cycle/lithium bromide absorption refrigeration cycle, a low-temperature multi-effect sea water desalination unit and a heat exchanger, so that the utilization efficiency of heat energy is improved, and the cascade recycling of the waste heat is realized;
3. The application utilizes the plane and the curved rectangular winglet vortex generator with the upward flow structure arranged on the surface of the fin of the compact tube-fin heat exchanger, improves the weak area behind the heat exchange tube, improves the flow resistance and the heat exchange performance of the compact tube-fin heat exchanger, and improves the heat exchange performance and the comprehensive performance of the compact tube-fin heat exchanger;
4. the ocean island/ocean platform comprehensive energy supply system capable of independently and stably running is established by effectively utilizing ocean renewable energy around the ocean island and integrated system waste heat to convert the ocean renewable energy into composite resources such as electric power, energy storage, fuel gas, cold energy, fresh water, heat supply and the like, and powerful energy guarantee is provided for the construction of ocean islands/ocean platforms with different function positioning such as resident, travel use, fishery use, transit base use, national defense use and the like;
drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:
FIG. 1 is a schematic diagram of the overall structure of an underwater compressed air energy storage cold-hot water poly-generation system in an embodiment of the application;
FIG. 2 is a schematic diagram of a waste heat utilization subsystem according to an embodiment of the present application;
fig. 3 is a schematic view of a compact tube and fin heat exchanger in an embodiment of the application.
Detailed Description
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.
It should be noted that the steps illustrated in the flowcharts of the figures may be performed in a computer system such as a set of computer executable instructions, and that although a logical order is illustrated in the flowcharts, in some cases the steps illustrated or described may be performed in an order other than that illustrated herein.
The application provides an underwater compressed air energy storage cold and hot water poly-generation system, as shown in figure 1, which comprises a seaweed biomass pretreatment subsystem, a seaweed biomass gasification purification subsystem, an internal combustion engine subsystem, an underwater compressed air energy storage subsystem, a compressed heat storage subsystem, a solar heat collector/storage subsystem and a waste heat utilization subsystem.
The integrated system stores redundant ocean renewable energy power in a compressed air mode, generates power through an ocean renewable energy device in the peak of electricity consumption and detonates the seaweed biomass synthetic gas to drive a generator to generate power through a gas internal combustion engine, and expands high-pressure air in an air expansion unit to do work and generate power in the peak of electricity consumption, so that the power demand of users is met.
The seaweed biomass pretreatment subsystem comprises a hot air dryer and a curing and forming device;
the hot air dryer is used for drying the seaweed biomass raw material by utilizing the hot air in the compressed heat storage subsystem, and the solidification forming equipment is used for carrying out forming treatment on the dried seaweed biomass raw material.
The seaweed biomass gasification purification subsystem comprises a biomass preheater, a fluidized bed gasifier, a crude gas cooler, a purification and dust removal device, a Roots blower, a safe water seal and a gas storage tank;
the biomass preheater, the fluidized bed gasifier, the crude gas cooler, the purifying and dedusting device, the Roots blower, the safe water seal device and the gas storage cabinet are connected in sequence;
the biomass preheater is used for preheating the seaweed biomass briquette fuel by using hot air in the oil heat exchanger; the raw gas cooler is used for heating air serving as a gasifying agent by utilizing the waste heat of the synthesis gas at the outlet of the fluidized bed gasifier, wherein the gasifying agent is air-water vapor gasifying agent by utilizing water vapor generated by a molten salt hot vapor generator and hot air generated by the raw gas cooler in a preset mass ratio; the seaweed biomass synthesis gas in the gas storage tank is respectively conveyed to a gas supply pipe network and the internal combustion engine subsystem, and the seaweed biomass synthesis gas conveyed to the gas supply pipe network is used for providing cooking fuel gas and fuel gas for power generation of the fuel gas internal combustion engine; seaweed biomass synthesis gas delivered to the subsystem of the internal combustion engine is combusted in the internal combustion engine, and heat released after combustion of the seaweed biomass synthesis gas comprises high-temperature flue gas and recirculated cylinder liner water.
The internal combustion engine subsystem comprises an air filter, a gas internal combustion engine and a generator; the air filter and the generator are respectively connected with the gas internal combustion engine;
the air filter is used for filtering particulate impurities in the air; the gas internal combustion engine is used for mixing seaweed biomass synthetic gas at the outlet of the gas storage tank and air at the outlet of the air filter according to a certain proportion to form mixed fuel, and converting chemical energy of the fuel into kinetic energy; the generator drives the generator to rotate by utilizing the crankshaft of the gas internal combustion engine, and converts kinetic energy into electric energy.
The underwater compressed air energy storage subsystem comprises an air compressor, a check valve, a flexible gas storage device, a pressure regulating valve, an air expander and a first reflux heat exchanger; the air expander is connected with the first reflux heat exchanger, the flexible gas storage device is respectively connected with a check valve and a pressure regulating valve, the check valve is connected with a final stage aftercooler of the compressor, and the pressure regulating valve is connected with the first reflux heat exchanger; the reflux heat exchanger is used for preheating air flowing out of the flexible gas storage device; the air compressor is used for electrically driving by utilizing ocean renewable energy sources;
the air compressor comprises three turbines connected in parallel, and the turbines comprise a first-stage compressor, a second-stage compressor and a third-stage compressor; the air compressor is used for improving compression efficiency by adopting a three-stage compression and interstage and final stage cooling method; the air expander comprises a first-stage expander, a second-stage expander and a third-stage expander, and the air expander adopts a three-stage expansion and intermediate heating method for improving the power generation efficiency.
The compression heat storage subsystem comprises a compressor inter-stage cooler, a compressor final stage aftercooler, a hot oil tank, a hot oil pump, a first oil heat exchanger, a second oil heat exchanger, a cold oil tank and a cold oil pump;
the cold oil tank, the cold oil pump, the compressor inter-stage cooler, the hot oil tank, the hot oil pump and the oil heat exchanger are sequentially connected, wherein the first cooler and the second cooler are connected in parallel, the compressor inter-stage cooler and the hot oil tank are respectively connected with the final stage aftercooler of the compressor in parallel, and the first oil heat exchanger and the second oil heat exchanger are connected in parallel;
the heat exchange pipes of the first cooler are respectively connected with the cold oil tank and the hot oil tank, and the fin channels of the first cooler are respectively connected with the first-stage compressor and the second-stage compressor; the heat exchange pipe of the second cooler is respectively connected with the cold oil tank and the hot oil tank, and the fin channel of the second cooler is respectively connected with the second-stage compressor and the third-stage compressor;
the heat exchange tube of the final stage aftercooler of the compressor is respectively connected with a cold oil tank and a hot oil tank, and the fin channel of the second cooler is respectively connected with the third stage compressor and a check valve;
an oil inlet of the hot oil tank is respectively connected with the first cooler, the second cooler and the final stage aftercooler, and an oil outlet of the hot oil tank is connected with the hot oil pump;
The hot oil pump is respectively connected with the hot oil tank, the first oil heat exchanger and the second oil heat exchanger; the heat exchange tube of the first oil heat exchanger is respectively connected with the hot oil pump and the cold oil pump, and the fin channels of the first oil heat exchanger are respectively connected with the air, the hot air dryer and the preheater;
the heat exchange tube of the first oil heat exchanger is respectively connected with the hot oil pump and the cold oil tank, and the fin channels of the first oil heat exchanger are respectively connected with the air, the hot air dryer and the preheater; the heat exchange tube of the second oil heat exchanger is respectively connected with the hot oil pump and the cold oil tank, and the fin channels of the second oil heat exchanger are respectively connected with the fresh water generator and the heat recovery steam generator II;
the cold oil tank is respectively connected with the first oil heat exchanger, the second oil heat exchanger and the cold oil pump; the cold oil pump is respectively connected with the cold oil tank, the compressor final-stage cooler, the second cooler and the first cooler.
Sensible heat contained in air in the compressed heat storage subsystem after passing through the air compressor is recovered and stored through the hot oil tank; hot oil in the hot oil tank enters an oil heat exchanger, and air heated by the first oil heat exchanger is used as a hot air source of a hot air dryer and preheating of a seaweed biomass briquette fuel feed of the fluidized bed gasifier respectively; fresh water heated by the second oil heat exchanger enters a heat recovery steam generator.
The solar heat collector/storage subsystem comprises a solar heat collector, a hot salt tank, a molten salt heat exchanger, a molten salt hot steam generator, a cold salt tank and a molten salt pump;
the molten salt pump comprises a cold salt pump and a hot salt pump; the molten salt heat exchanger comprises a first molten salt heat exchanger, a second molten salt heat exchanger and a third molten salt heat exchanger, and the molten salt heat exchanger and the molten salt heat steam generator both adopt compact tube fin heat exchangers;
the solar heat collector is respectively connected with the cold salt pump and the hot salt tank; the hot salt tank is respectively connected with the solar heat collector and the hot salt pump; the hot salt pump is respectively connected with the hot salt tank, the molten salt hot steam generator and the molten salt hot heat exchanger;
the first molten salt heat exchanger, the second molten salt heat exchanger, the third molten salt heat exchanger and the heat exchange pipes of the molten salt heat steam generator are respectively connected with a hot salt pump and a cold salt tank, and fin channels of the first molten salt heat exchanger are respectively connected with a first-stage expansion machine and a first-stage expansion machine of the reflux heat exchanger; the fin channels of the second molten salt heat exchanger are respectively connected with the first-stage expander and the second-stage expander; the fin channels of the third molten salt heat exchanger are respectively connected with the second-stage expander and the third-stage expander; the fin channels of the fused salt hot steam generator are respectively connected with fresh water, a three-way valve (figure 2) and a fluidized bed gasifier.
The cold salt tank is respectively connected with the molten salt hot steam generator, the molten salt hot heat exchanger and the hot salt pump; the cold salt pump is respectively connected with the cold salt tank and the solar heat collector.
The waste heat utilization subsystem comprises a recirculating cylinder sleeve water unit, a flue gas heat storage unit, an organic Rankine cycle and injector circulation unit, a low-temperature multi-effect distillation sea water desalination unit and a steam utilization unit;
the flue gas heat storage unit is connected with the organic Rankine cycle and ejector cycle unit and the low-temperature multi-effect distillation sea water desalination unit; the recirculating cylinder sleeve water unit is respectively connected with the gas internal combustion engine, the fresh water and the heat preservation water tank; the flue gas heat storage unit comprises a first heat recovery steam generator, a second heat recovery steam generator and a flue gas/water heat exchanger; the steam heat utilization unit comprises a lithium bromide absorption refrigeration unit and a plate heat exchanger;
the waste heat of the flue gas heat storage unit flows into the organic Rankine cycle and the ejector cycle unit to drive the ORC cycle to generate power and the jet refrigeration cycle to generate cold energy; then, low-grade flue gas at the outlet of the first heat recovery steam generator, hot air at the outlets of the crude gas cooler and the reflux heat exchanger I and hot water at the outlet of the second oil heat exchanger flow into the second heat recovery steam generator to drive the low-temperature multi-effect distilled seawater desalination unit to produce fresh water; and finally, the flue gas waste heat at the second outlet of the heat recovery steam generator drives the flue gas/water heat exchanger to produce hot water. And the steam of the steam heat utilization unit drives the lithium bromide absorption refrigeration unit to generate cold energy in summer, and the plate heat exchanger is used for supplying heat load to users in non-summer.
A hot air dryer in the seaweed biomass pretreatment subsystem utilizes partial hot air of the first oil heat exchanger to dry seaweed biomass raw materials until the water content is reduced to below 20%; the seaweed biomass gasification purification subsystem uses water vapor generated by a fused salt hot vapor generator and hot air generated by a crude gas cooler as gasifying agents in an optimal mass ratio.
The gasifying agent uses partial water vapor generated by the fused salt hot vapor generator and hot air generated by the crude gas cooler as an air-water vapor gasifying agent according to the optimal mass ratio, so that the quality, the heat value and the gasification efficiency of the seaweed biomass gasification gas production are improved.
The biomass preheater preheats biomass particles by utilizing part of hot air of the first oil heat exchanger until the water content is reduced to below 10%.
The coarse gas cooler heats air in gasifying agent of the gasifying furnace by utilizing the waste heat of high-temperature synthetic gas at the outlet of the fluidized bed gasifying furnace.
The heat released by the seaweed biomass synthesis gas in the internal combustion engine subsystem after the combustion of the gas internal combustion engine comprises high-temperature flue gas and recirculated cylinder liner water, so that the gas internal combustion engine is prevented from overheating.
The biomass synthesis gas in the gas holder is conveyed to a gas supply pipe network by means of pressure generated by the counterweight of the gas holder to provide cooking gas and gas for power generation of a gas internal combustion engine for users, so that stable outward gas supply and power supply are realized.
In the internal combustion engine subsystem, the air filter and the generator are respectively connected with a gas internal combustion engine.
An air compressor in the underwater compressed air energy storage subsystem is driven by using ocean renewable energy power with surplus electricity consumption valley; the air compressor includes a first air compressor, a second air compressor, and a third air compressor.
In order to utilize the waste heat of the expanded air, a reflux heat exchanger is arranged behind the third-stage expander, and the recovered heat is used for preheating the high-pressure low-temperature air flowing out of the flexible gas storage device.
The ocean renewable energy source comprises at least one of solar energy, wind energy, ocean biomass energy and wave energy; considering the limited sea island area, the marine renewable energy power generation equipment adopts a paddle-free fan, a floating photovoltaic cell panel, a seaweed biomass fluidized bed gasifier and an oscillating float type wave device respectively.
The air compressor adopts three-stage compression and interstage and final stage cooling methods, and the air expander adopts three-stage expansion and intermediate heating methods, so that the efficiency and the power generation power of the compressor are improved. The air compressor package employs the same compression ratio, thereby minimizing the required compression power. The air compressor train is composed of three turbines in parallel (axial, hybrid or centrifugal compressors).
The air compressor unit interstage cooler and the final stage aftercooler exchange heat with heat conduction oil from a cold oil tank by utilizing air compression heat of outlets of the first air compressor, the second air compressor and the third air compressor, and the heat-stored hot oil is stored in a hot oil tank.
Sensible heat contained in air in the compression heat storage subsystem after being compressed by the first air compressor, the second air compressor and the third air compressor is recovered and stored by utilizing a heat conduction oil tank; hot oil enters a first oil heat exchanger to heat air and a second oil heat exchanger to heat fresh water, a part of the air heated by the first oil heat exchanger is used as a hot air source of a hot air dryer in the seaweed biomass gasification purification subsystem, the seaweed biomass raw material is dried, and the other part of the air is used for preheating the seaweed biomass briquette fuel feed of the fluidized bed gasifier; the fresh water heated by the second oil heat exchanger enters a second heat recovery steam generator for driving a low-temperature multi-effect sea water desalination unit.
The solar heat collector/storage subsystem utilizes solar energy to heat molten salt to be stored in a hot salt tank by the solar heat collector, part of the molten salt enters a first molten salt heat exchanger, a second molten salt heat exchanger and a third molten salt heat exchanger to heat high-pressure low-temperature air, and the temperature of the air entering an air expansion unit is increased; and part of the hot molten salt enters a molten salt hot steam generator to heat fresh water to generate steam.
Saturated steam at the outlet of the fused salt hot steam generator is partially used as a gasifying agent of the fluidized bed gasifier; part of the heat energy is used in a waste heat utilization subsystem, the lithium bromide absorption refrigeration unit is driven in summer to generate cold energy, and the heat energy is supplied to users in other seasons (heating or living hot water), as shown in fig. 2.
The waste heat utilization subsystem utilizes the waste heat of the flue gas, and the waste heat firstly flows into a heat recovery steam generator to drive an organic Rankine cycle and an ejector cycle unit to generate cold energy in the peak and the peak period of electricity utilization; and then hot air at the outlets of the low-grade flue gas, the crude gas cooler and the reflux heat exchanger and hot water at the outlet of the second oil heat exchanger flow into the heat recovery steam generator II and the low-temperature multi-effect distilled seawater desalination unit to produce fresh water. In addition, the redundant heat of different parts of the subsystem heats fresh water and stores the fresh water in the heat preservation water tank, so that the heat requirement of a user is met.
The Organic Rankine (ORC) cycle consists of a turbine, a first condenser, a first working medium pump, a second reflux heat exchanger, a first heat exchanger and a second heat exchanger.
The organic Rankine cycle subunit utilizes the heat recovery steam generator I to recover heat of flue gas exhausted by the gas internal combustion engine, organic fluid is converted into saturated steam and then expands in a turbine to generate power to drive a generator to generate electricity, toluene steam at the outlet of the turbine is recovered by the heat exchanger I, the heat exchanger II is used for providing saturated steam for injection refrigeration cycle in summer, the heat exchanger I is used for heating fresh water to provide hot water in other seasons, the heat regenerator II is used for heating residual energy to the inlet flow of the heat recovery steam generator I, and the organic fluid is returned to the heat recovery steam generator I again after passing through the condenser I and the working medium pump I;
The organic working medium of the ORC cycle is toluene, which can withstand the high temperature of the flue gas and has higher performance than other organic fluids in this temperature range.
The ejector circulation subunit utilizes the heat of the overheat flow at the outlet of the ORC turbine to evaporate the liquid refrigerant, and the refrigerant steam (primary steam) and the refrigerant flow (secondary steam) taken out of the evaporator as power flow are mixed in the ejector and then flow to the condenser II, and the heat is released to cooling water and then condensed; wherein the condensed flow of the refrigerant of the condenser is divided into two flows, one part of the condensed flow is expanded in the expansion valve and then is vaporized in the evaporator by absorbing heat from the cooling medium to generate cold energy, and the other part of the condensed flow is pumped back to the second heat exchanger (generator VG) by the second working medium pump to form a primary air flow.
The working fluid circulated by the ejector is R123, which is an environmentally friendly, non-toxic, nonflammable, non-corrosive, low pressure refrigerant.
The final stage aftercooler of the compressor, the inter-stage cooler of the compressor, the oil heat exchanger, the fused salt heat steam generator and the flue gas/water heat exchanger all adopt four rows of compact tube fin heat exchangers with staggered round tubes, as shown in figure 3. In order to improve the overall performance of tube-fin heat exchangers, a novel combination of curved and straight rectangular winglet vortex generator pairs in a common upflow configuration on the plate fins is proposed.
The system stores redundant ocean renewable energy power in a compressed air mode, generates power through an ocean renewable energy device in the peak of electricity consumption and detonates seaweed biomass gas to drive a generator to generate power through a gas internal combustion engine, and expands high-pressure air in an air expansion unit to do work and generate power in the peak of electricity consumption, so that the power requirement of a user is met; the waste heat utilization subsystem utilizes the waste heat of different parts of the integrated system to generate cold energy, fresh water and hot water, so that the cold and hot water demands of users are met; the seaweed biomass gasification subsystem stores purified biomass gas stored in the gas storage tank and conveys the purified biomass gas to the gas supply pipe network to provide cooking gas for users, so that the gas requirements of the users are met.
The system can be realized by the following steps:
1. off-peak hours
The excess electricity of the off-peak (about 12 hours) ocean renewable energy source drives the motor, which drives the compressor train of the subsea compressed air energy storage subsystem to compress air and consume electrical energy. After passing through the compressor, the air pressure is increased, the temperature is increased, the air leaving the compressor passes through the inter-stage cooler of the compressor and the final stage aftercooler to exchange heat with cold heat conduction oil, and the heat of the compressed air is exchanged to the heat conduction oil and is stored in a hot oil tank of the compression heat storage subsystem. And 3-stage compression and 3-time heat exchange are carried out, and high-pressure compressed air is conveyed into the underwater flexible gas storage device through a pipeline for constant-pressure storage. Meanwhile, air and heat conduction oil exchange heat in a first oil heat exchanger of the compression heat storage subsystem, a part of heated air is used as a hot air source of a hot air dryer in the seaweed biomass pretreatment subsystem, the dried seaweed biomass raw material is dried, and then the raw material is made into biomass particles meeting industry standards by utilizing curing forming equipment; the heat of the heat conduction oil is exchanged with air to be changed into cold heat conduction oil, and the cold heat conduction oil is stored in a cold oil tank.
2. Middle peak time period
In the middle-peak period (8 hours), the seaweed biomass gasification purification subsystem, the internal combustion engine subsystem and the waste heat utilization subsystem are operated to meet the requirements of users on cold and hot electricity, fresh water and gas. Biomass particles are preheated by hot air and then fed into a fluidized bed gasifier, and are gasified with gasifying agents in the fluidized bed gasifier to generate synthesis gas. The high-temperature synthesis gas sequentially passes through a crude gas cooler and a purifying and dedusting device to remove tar, ash and condensed water in the crude gas. The purified synthetic gas is pumped out by a Roots blower, the safe water seal is stored in the gas storage cabinet, and then the gas is conveyed to a gas supply pipe network by the pressure generated by the counterweight of the gas storage cabinet to provide cooking gas and gas for power generation of a gas internal combustion engine for users, so that stable outward gas supply and power supply are realized. The first heat recovery steam generator and the second heat recovery steam generator operate ORC circulation, a low-temperature multi-effect sea water desalination unit, a lithium bromide absorption refrigeration unit (summer) or a plate heat exchanger (other seasons) by utilizing the flue gas at the outlet of the gas internal combustion engine, hot air at the outlet of the reflux heat exchanger, hot air at the outlet part of the crude gas cooler, hot water at the outlet of the second oil heat exchanger and residual heat of water steam at the outlet part of the molten salt hot steam generator; meanwhile, in order to reduce energy loss in the ORC cycle, the energy in the outlet flow of the ORC turbine is recovered, and the second heat exchanger is utilized to operate the jet refrigeration cycle (summer) or the first heat exchanger, so that cold, heat and power and fresh water are provided for users, and comprehensive utilization of energy is realized.
3. Peak time period
And in the electricity consumption peak period (4 hours), releasing the high-pressure low-temperature compressed air stored in the underwater flexible gas storage device, preheating the air after heat exchange with the hot molten salt in the molten salt heat exchanger through the outlet air waste heat of the air expander, raising the temperature, enabling the high-temperature high-pressure air to enter the expander for expansion work, driving the generator to generate electricity, and realizing stable outward power supply. The operation of the whole integrated system effectively utilizes ocean renewable energy sources around ocean islands and the waste heat of the integrated system, converts the ocean renewable energy sources into composite resources such as electric power, energy storage, fuel gas, cold energy, fresh water, heat supply and the like, and establishes an ocean island/ocean platform comprehensive energy supply system capable of independently and stably operating.
The present application is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present application are intended to be included in the scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims (9)

1. An underwater compressed air energy storage cold and hot water poly-generation system, characterized by comprising:
Seaweed biomass pretreatment subsystem: the method is used for carrying out shaping treatment on the dried seaweed biomass raw material;
the seaweed biomass gasification purification subsystem: the method comprises the steps of gasifying seaweed biomass briquette fuel to generate seaweed biomass synthetic gas, purifying and storing the seaweed biomass synthetic gas, and conveying the seaweed biomass synthetic gas to an external pipe network;
an internal combustion engine subsystem: the engine is driven by the seaweed biomass synthesis gas to generate electricity;
an underwater compressed air energy storage subsystem: the device is used for storing redundant ocean renewable energy power when the power consumption is low, and releasing high-pressure air to expand to do work and generate power when the power consumption is high;
compression heat storage subsystem: the device is used for recovering and storing sensible heat contained in the compressed air by utilizing the heat conduction oil, and heating the air and fresh water by utilizing the heat conduction oil;
solar collector/storage subsystem: the solar energy storage device is used for storing solar energy by using molten salt, and heating high-pressure low-temperature air and heating fresh water by using hot molten salt to generate steam;
and the waste heat utilization subsystem: the system is used for generating cold energy, fresh water and hot water by utilizing the waste heat of different subsystems;
the seaweed biomass pretreatment subsystem, the seaweed biomass gasification purification subsystem, the internal combustion engine subsystem, the underwater compressed air energy storage subsystem, the compressed heat storage subsystem, the solar heat collector/storage subsystem and the waste heat utilization subsystem are sequentially connected.
2. The underwater compressed air energy storage cold and hot water polygeneration system of claim 1, characterized in that the seaweed biomass pretreatment subsystem comprises a hot air dryer and a solidification forming device; the hot air dryer is used for drying the seaweed biomass raw material by utilizing hot air in the compression heat storage subsystem, and the solidification forming equipment is used for forming the dried seaweed biomass raw material.
3. The underwater compressed air energy storage cold and hot water poly-generation system according to claim 2, wherein the seaweed biomass gasification purification subsystem comprises a biomass preheater, a fluidized bed gasifier, a raw gas cooler, a purification and dust removal device, a Roots blower, a safe water seal and a gas storage tank;
the biomass preheater, the fluidized bed gasifier, the crude gas cooler, the purifying and dedusting device, the Roots blower, the safe water seal device and the gas storage tank are connected in sequence;
the biomass preheater is used for preheating the seaweed biomass briquette fuel by using hot air in the oil heat exchanger;
The raw gas cooler is used for heating air serving as a gasifying agent by utilizing the waste heat of the synthesis gas at the outlet of the fluidized bed gasifier, wherein the gasifying agent is air-water vapor gasifying agent by utilizing water vapor generated by a molten salt hot vapor generator and hot air generated by the raw gas cooler in a preset mass ratio;
the seaweed biomass synthesis gas in the gas storage tank is respectively conveyed to a gas supply pipe network and the internal combustion engine subsystem, and the seaweed biomass synthesis gas conveyed to the gas supply pipe network is used for providing cooking gas and gas for power generation of the gas internal combustion engine; the seaweed biomass synthesis gas conveyed into the internal combustion engine subsystem is combusted in the internal combustion engine, and heat released after combustion of the seaweed biomass synthesis gas comprises high-temperature flue gas and recirculated cylinder liner water.
4. The subsea compressed air energy storage cold, hot water polygeneration system of claim 3, characterized in that said internal combustion engine subsystem comprises an air filter, a gas internal combustion engine and a generator; wherein the air filter and the generator are respectively connected with the gas internal combustion engine;
the air filter is used for filtering particulate impurities in the air;
the gas internal combustion engine is used for mixing seaweed biomass synthetic gas at the outlet of the gas storage tank and air at the outlet of the air filter according to a preset proportion to form mixed fuel, and converting chemical energy of the fuel into kinetic energy;
The generator drives the generator to rotate by utilizing the crankshaft of the gas internal combustion engine, and converts kinetic energy into electric energy.
5. The underwater compressed air energy storage cold and hot water polygeneration system of claim 4, characterized in that the underwater compressed air energy storage subsystem comprises an air compressor, a check valve, a flexible gas storage device, a pressure regulating valve, an air expander and a first reflux heat exchanger; the air expander is connected with the first reflux heat exchanger, the flexible gas storage device is respectively connected with the check valve and the pressure regulating valve, the check valve is connected with the final stage aftercooler of the compressor, and the pressure regulating valve is connected with the first reflux heat exchanger;
the heat recovery device comprises a flexible gas storage device, a heat recovery device and a heat recovery device, wherein the heat recovery device is used for preheating air flowing out of the flexible gas storage device; the air compressor is used for electrically driving by using ocean renewable energy sources;
the air compressor comprises three turbines connected in parallel, wherein the turbines comprise a first-stage compressor, a second-stage compressor and a third-stage compressor; the air compressor is used for improving compression efficiency by adopting a three-stage compression and interstage and final stage cooling method;
the air expander comprises a first-stage expander, a second-stage expander and a third-stage expander, and the air expander adopts a three-stage expansion and intermediate heating method for improving the power generation efficiency.
6. The subsea compressed air energy storage cold, hot water polygeneration system of claim 5, characterized in that the compression heat storage subsystem comprises a compressor inter-stage cooler, a compressor final stage aftercooler, a hot oil tank, a hot oil pump, an oil heat exchanger, a cold oil tank, and a cold oil pump;
the compressor inter-stage cooler comprises a first cooler and a second cooler, the oil heat exchanger comprises a first oil heat exchanger and a second oil heat exchanger, and the compressor final stage aftercooler, the compressor inter-stage cooler and the oil heat exchanger are all compact tube fin heat exchangers;
the cold oil tank, the cold oil pump, the compressor inter-stage cooler, the hot oil tank, the hot oil pump and the oil heat exchanger are sequentially connected, wherein the first cooler and the second cooler are connected in parallel, the compressor inter-stage cooler and the hot oil tank are respectively connected with the final stage aftercooler of the compressor in parallel, and the first oil heat exchanger and the second oil heat exchanger are connected in parallel;
sensible heat contained in the air in the compression heat storage subsystem after passing through the air compressor is recovered and stored through the hot oil tank; the hot oil in the hot oil tank enters an oil heat exchanger, and air heated by the first oil heat exchanger is respectively used as a hot air source of a hot air dryer and preheating of the seaweed biomass briquette fuel feed of the fluidized bed gasifier; fresh water heated by the second oil heat exchanger enters a heat recovery steam generator.
7. The subsea compressed air energy storage cold and hot water polygeneration system of claim 6, characterized in that said solar collector/storage subsystem comprises a solar collector, a hot salt tank, a molten salt heat exchanger, a molten salt hot steam generator, a cold salt tank and a molten salt pump;
the molten salt pump comprises a cold salt pump and a hot salt pump; the molten salt heat exchanger comprises a first molten salt heat exchanger, a second molten salt heat exchanger and a third molten salt heat exchanger, and the molten salt heat exchanger and the molten salt heat steam generator both adopt compact tube fin heat exchangers;
the solar heat collector, the hot salt tank, the hot salt pump, the molten salt heat exchanger, the cold salt tank and the cold salt pump are sequentially connected, wherein the molten salt heat exchanger and the cold salt tank are respectively connected with the molten salt hot steam generator in parallel, and the first molten salt heat exchanger, the second molten salt heat exchanger and the third molten salt heat exchanger are connected in parallel;
the solar heat collector utilizes solar energy to heat molten salt entering through the cold salt pump, the heated molten salt is respectively stored in the hot salt tank, the heated molten salt enters into the molten salt heat exchanger through the hot salt pump to heat air and enters into the molten salt heat steam generator to heat fresh water to generate steam, and the molten salt after heat release is stored in the cold salt tank.
8. The underwater compressed air energy storage cold and hot water polygeneration system of claim 7, characterized in that the waste heat utilization subsystem comprises a recirculating cylinder liner water unit, a flue gas heat storage unit, an organic rankine cycle and ejector cycle unit, a low-temperature multi-effect distillation sea water desalination unit, a steam heat utilization unit;
the recirculating cylinder sleeve water unit is respectively connected with the gas internal combustion engine and a heat preservation water tank in the waste heat utilization subsystem; the flue gas heat storage unit is respectively connected with the organic Rankine cycle and ejector cycle unit, the low-temperature multi-effect distillation sea water desalination unit and the heat preservation water tank, and the steam heat utilization unit is connected with a molten salt heat steam generator in the solar heat collector/storage subsystem;
the flue gas heat storage unit comprises a first heat recovery steam generator, a second heat recovery steam generator and a flue gas/water heat exchanger, and the steam heat utilization unit comprises a lithium bromide absorption refrigeration unit and a plate heat exchanger;
the waste heat of the flue gas heat storage unit flows into the organic Rankine cycle and the ejector cycle unit to drive ORC cycle power generation and injection refrigeration cycle to generate cold energy; then, the low-grade flue gas at the outlet of the first heat recovery steam generator, the crude gas cooler, hot air at the outlet of the first reflux heat exchanger and hot water at the outlet of the second oil heat exchanger flow into the second heat recovery steam generator to drive the low-temperature multi-effect distillation sea water desalination unit to produce fresh water, and flue gas waste heat at the outlet of the second heat recovery steam generator drives the flue gas/water heat exchanger to produce hot water;
And the steam of the steam heat utilization unit drives the lithium bromide absorption refrigeration unit to generate cold energy in summer, and the plate heat exchanger is utilized to supply heat load to users in non-summer.
9. The subsea compressed air energy storage cold, hot water polygeneration system of claim 8, characterized in that the organic rankine cycle and injector cycle units comprise an organic rankine cycle subunit and an injector cycle subunit, the organic rankine cycle subunit being connected to the flue gas heat storage unit and the injector cycle subunit, respectively;
the organic Rankine cycle subunit comprises a turbine, a first condenser, a first working medium pump, a second reflux heat exchanger and a first heat exchanger; the turbine, the first heat exchanger, the second reflux heat exchanger, the first condenser and the first working medium pump are sequentially connected;
the ejector circulation subunit comprises a second heat exchanger, an ejector, an evaporator, an expansion valve, a second condenser and a second working medium pump; the second heat exchanger, the ejector, the evaporator, the expansion valve and the second working medium pump are sequentially connected, and the expansion valve and the second working medium pump are respectively connected with the second condenser in parallel;
the organic Rankine cycle subunit utilizes the first heat recovery steam generator to recover heat of flue gas exhausted by the gas internal combustion engine, organic fluid is converted into saturated steam and then expands in a turbine to generate power to drive a generator to generate electricity, toluene steam at an outlet of the turbine is used for recovering energy of the toluene steam through the first heat exchanger, the second heat return exchanger is used for heating residual energy to an inlet flow of the first heat recovery steam generator, and the organic fluid is returned to the first heat recovery steam generator again after passing through the first condenser and the first working medium pump;
The ejector circulation subunit utilizes the heat of the superheated flow at the outlet of the turbine to evaporate liquid refrigerant, and the refrigerant steam and the refrigerant flow carried out from the evaporator as power flow by the refrigerant steam are mixed in the ejector and then flow to the condenser II, and the heat is released to cooling water and then condensed; the refrigerant concentrated flow of the condenser is divided into two flows, one part of the refrigerant concentrated flow is expanded in the expansion valve and then is vaporized in the evaporator through absorbing heat from a cooling medium to generate cold energy, and the other part of the refrigerant concentrated flow is pumped back to the heat exchanger by the working medium pump II to form primary air flow.
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