CN103256081B - Energy comprehensive utilization method based on supercritical air - Google Patents
Energy comprehensive utilization method based on supercritical air Download PDFInfo
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Abstract
The invention discloses an energy comprehensive utilization method based on supercritical air. The method is suitable for an energy comprehensive utilization system based on the supercritical air. The system comprises an air liquefaction subsystem, an air separation subsystem and an air expanding generating subsystem. The method comprises the following steps that the air liquefaction subsystem liquefies air; the air separation subsystem separates liquefied air to obtain nitrogen and oxygen, the nitrogen is conveyed to the air expanding generating subsystem through a pipeline, the oxygen is stored and/or conveyed to external equipment; the air expanding generating subsystem generates power through the nitrogen provided by the air separation subsystem. Through the method, the nitrogen with high purity flows in main pipelines of the system in most time, energy comprehensive utilization based on the supercritical air is effectively achieved, and service life of the system is prolonged.
Description
Technical field
The present invention relates to comprehensive utilization of energy field, particularly a kind of comprehensive energy utilization method based on supercritical air.
Background technique
The energy is the requisite production and subsistence of modern society, ensures energy stabilizing supply, improves constantly the important foundation that efficiency of energy utilization is the national economic development and social progress.China's energy is relatively deficient, per capita energy's owning amount is in world's reduced levels, and China is in industrialization and urbanization Rapid development stage, to the basic raw material such as iron and steel, cement demand, make the growth rigidity that the industry of these highly energy-consumings still keeps certain.Therefore, solve the used heat of these industries and the recycling of waste heat, the comprehensive utilization ratio improving the energy is significant.
Along with energy resource supply growing tension, the cost that energy consumption occupies is increasing for high energy-consuming enterprises's impact, and what have even exceedes the cost of raw material.Utilize used heat, exhaust heat recovery power generation, both can meet the lifelong need for electricity of enterprise to greatest extent, reduce outer purchase of electricity, enterprise's cost of production can be reduced again, increase economic efficiency.
Current existing waste heat generation technology comprises: high-temperature residual heat generating, the band low-temperature cogeneration of afterburning, the low-temperature cogeneration without afterburning.Without the low-temperature cogeneration of afterburning owing to being the UTILIZATION OF VESIDUAL HEAT IN without fuel, so more meet the requirement of energy-conserving and environment-protective;
Tradition afterheat generating system is the system based on gas turbine technology exploitation, namely the high-temperature gas of industrial waste heat and waste heat is utilized, or utilize 350 ~ 450 degree of low-temperature waste heats Celsius and waste heat gas, by the fossil fuel that afterburning is certain, Direct driver gas turbine generates electricity.Its shortcoming is that energy recovery efficiency is low.System needs fossil fuel to provide thermal source, does not meet energy development requirement.
The low-temperature cogeneration without afterburning of recent appearance utilizes low-temperature waste heat and waste heat gas, reclaims heat energy by SP heat pipe waste heat boiler and AQC heat pipe waste heat boiler, drives condensing steam turbine generator generating.This method makes the temperature of final Exhaust Gas be reduced to 150 degree Celsius, improves the recovery rate of heat energy, makes system substantially depart from fossil fuel.But this method remains a kind of recovery of single energy, and a large amount of heat energy of discharging in water cooling system for these industry extensive uses still cannot reclaim.
Reclaim and store the energy that may waste, then effectively discharging the energy of storage, be that each state in the whole world is all in the problem of seeking solution always.
As shown in Figure 1, this is a kind of typically based on the energy comprehensive utilization system structural drawing of supercritical air in prior art.Its concrete reference character is explained see disclosed Chinese invention patent application 201210266532.0 and utility application 201220370877.6.Based on the energy comprehensive utilization system of supercritical air, also referred to as supercritical air energy storage/release system, should comprise accumulation of heat/heat exchanger 2 and cold-storage/heat exchanger 4, what reflux in pipeline during fault offset is all air before and after expansion work.Oxygen nitrogen mixture in air can cause the corrosion of pipeline and aging.
Inventor is realizing finding in process of the present invention, although in Chinese patent application 201210266532.0, 200910225252.3, 201220370877.6 and 201210518522.1 in also disclose multiple supercritical air energy storage/release system, partial extent solves some problems, but be air due to what reflux in pipeline when these systems release energy always, oxygen wherein causes system pipeline soon aging, the defect that life-span is short, there will be system cost also unrecovered come but the problem of system ageing failure, and not only need cold-storage heat-exchanger also to need regenerative heat exchanger in these systems, cause system complex, build the problem that cost is high.In addition, existing system majority merely provides air-fluidized means, and for post liquefaction air separable for nitrogen and oxygen, more make full use of energy resources and do not propose a solution.Therefore, a kind of system be provided, can energy storage be solved, effectively can release energy again, can also be the system of nitrogen and oxygen more efficent use of resources by the air separation of post liquefaction, and system can be made to have the relatively long life-span, so that guarantee can not only cost-recovering, great economic benefit can also be brought.
Summary of the invention
Based on above problem, the invention discloses a kind of comprehensive energy utilization method based on supercritical air, it utilizes property and the heat-exchanger rig of air supercritical state, air is carried out liquefaction stored energy, then carries out nitrogen oxygen separating, isolate the oxygen that value is higher, nitrogen expansion is done work, make system release can time pipeline in main circulation be nitrogen, extend lifetime of system, thus solve paddy electricity, wind-powered electricity generation abandons electricity and can not get effectively utilizing and problem of complex utilization after compressed-air energy storage.
For reaching above-mentioned purpose, the invention provides a kind of comprehensive energy utilization method based on supercritical air, described method is applicable to a kind of energy comprehensive utilization system based on supercritical air, and described system comprises: air liquefaction subtense angle, air separation subtense angle, gas expansion power generation sub-system; Described method comprises the steps:
Described air liquefaction subtense angle liquefies to air;
The air of described air separation subtense angle to post liquefaction is separated to obtain nitrogen and oxygen, gives described gas expansion power generation sub-system by described nitrogen by Cemented filling, and is stored by described oxygen and/or output to external equipment;
The nitrogen that described gas expansion power generation sub-system utilizes described air separation subtense angle to provide generates electricity.
The Advantageous Effects of technique scheme of the present invention is: compared with traditional used heat, afterheat generating system, energy comprehensive utilization system has following potential advantage: the Collection and utilization considering energy, not only increase energy utilization efficiency, can be enterprise simultaneously and raw material needed for production and by-product are provided, can be Reducing Cost in Enterprises, create new growth engines.The present invention, dexterously by pressurized air deep cooling oxygen, generates electricity with energy recovery and combines, and proposes a kind of implementation methods of the comprehensive energy recycling system that life-span is long, efficiency is high for highly energy-consuming trade such as metallurgy, cement and thermoelectricitys.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the present invention is further described.
The energy comprehensive utilization system structural drawing based on supercritical air of Fig. 1 prior art;
Fig. 2 is the energy comprehensive utilization system structural drawing based on supercritical air of the embodiment of the present invention;
Fig. 3 is the flow chart of the comprehensive energy utilization method based on supercritical air of the embodiment of the present invention.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly understand, below in conjunction with embodiment also with reference to accompanying drawing, the present invention is described in more detail.Should be appreciated that, these describe just exemplary, and do not really want to limit the scope of the invention.In addition, in the following description, the description to known features and technology is eliminated, to avoid unnecessarily obscuring concept of the present invention.
Fig. 2 is the energy comprehensive utilization system structural drawing based on supercritical air of the present invention.In a preferred embodiment of the present invention, the energy comprehensive utilization system based on supercritical air of the present invention comprises: air liquefaction subtense angle S1, air separation subtense angle S2, gas expansion power generation sub-system S3.Wherein, air liquefaction subtense angle S1 can comprise air compressor unit 2, cold-storage heat exchanger 3 and liquid container 5.Air separation subtense angle S2 can comprise oxygen-nitrogen separator 9, heat exchanger 10.Gas expansion power generation sub-system S3 can comprise the expansion unit be made up of at least one low-pressure expansion machine 13, at least one high pressure expansion machine 12 by propeller shaft couplings and generator 14.Of the present invention based in the energy comprehensive utilization system of supercritical air, in air liquefaction subtense angle S1, air separation subtense angle S2 and gas expansion power generation sub-system S3 any be provided with between the two at least one pipeline (as pipeline 30,29,28,20,21).Be provided with the pipeline 30 being with valve 15 between air compressor unit 2 and low-pressure expansion machine 13, this pipeline 30 for by air compressor unit 2 to low-pressure expansion machine 13 input compressed-air.Be provided with pipeline 29 between gas expansion power generation sub-system S3 and cold-storage heat-exchanger 3, this pipeline is used for by gas expansion power generation sub-system S3 to cold-storage heat-exchanger 3 transporting low temperature gas.Pipeline can be provided with throttle valve (as 4), pressure regulator valve (as 11) or stop valve (as 6,17,15).As the general condition realizing the energy comprehensive utilization system based on supercritical air of the present invention, certainly also comprise oxygen therapy pipe valve 8 that the liquid oxygen after being separated exports in cold-storage air scavenge conduit 30 in air liquefaction subtense angle S1 and valve 16, air separation subtense angle S2, but these are not emphasis of the present invention, are not therefore described in detail them.
Be provided with the pipeline 23 of the inlet opening being connected to the high pressure expansion machine 12 of gas expansion power generation sub-system S3 from the low temperature nitrogen delivery outlet of air separation subtense angle S2 between air separation subtense angle S2 and gas expansion power generation sub-system S3, for by air separation subtense angle S2 to gas expansion power generation sub-system S3 conveying high-pressure low temperature nitrogen.Pipeline can be provided with pressure regulator valve 11.Now, what flow through in pipeline 23 is the nitrogen that purity is higher, and therefore the gas attack effect that is subject to the gas passageway of high pressure expansion machine 12 of pipeline 23 is very little, and therefore lifetime of system also can extend greatly.Although clearly do not draw the various import and export of air separation subtense angle in figure, those skilled in the art readily appreciates that, as required, can arrange nitrogen delivery outlet, oxygen delivery outlet and air-out, and connects corresponding import and export.
Air separation subtense angle S2 also and between the generator 14 of gas expansion power generation sub-system S3 can be provided with pipeline 28, and this pipeline is used for by air separation subtense angle S2 to generator 14 transporting low temperature gas.This pipeline also can arrange modulating valve.Here the gas inputted can be unsegregated air, also can be the nitrogen after being separated, if nitrogen, can extend the life-span of the pipeline flowed through equally.
Liquid container 5 is provided with pipeline between cold-storage heat-exchanger 3, and this pipeline is used for by liquid container 5 to cold-storage heat-exchanger 3 transporting low temperature gas.As shown in Figure 2, now pipeline regulates by modulating valve 17, for the air of part gaseous state in liquid container 5 is flowed to cold-storage heat-exchanger 3.Path when gas expansion power generation sub-system S3 works by regulating low temperature valve 17 to close this pipeline.It should be noted that being provided with pipeline 19 between cold-storage heat-exchanger 3 to liquid container 5 is the most basic structures, pipeline 19 is for the liquid air in cold-storage heat-exchanger 3 is transported to liquid container 5, can be provided with throttle valve 4 in path.
The pipeline 28 of the cooler being connected to the generator 14 of gas expansion power generation sub-system S3 from the low temperature nitrogen delivery outlet of air separation subtense angle S2 is provided with between the generator 14 of air separation subtense angle S2 and gas expansion power generation sub-system S3, for from air separation subtense angle S2 to generator 14 transporting low temperature nitrogen, generator is cooled.What carry here is the nitrogen that purity is higher, can reduce conduit deteriorates.
Air liquefaction subtense angle S1 can also comprise air purification and purifier apparatus, not shown, and compressor bank 2 can adopt coaxial series connection or split axle parallel connection to connect with driving source, only schematically draws a compressor in figure.Can comprise multiple stage low pressure compressor and high pressure compressor in compressor bank, unit is mutually connected or is integrated into overall multistage unit.
Expansion unit can comprise multiple stage low-pressure expansion machine and high pressure expansion machine, and coaxial series connection or split axle parallel connection can be adopted to connect with generator shaft.They are mutually connected or are integrated into overall multiple expansion engine.
Compressor in compressor bank 2 can be piston type, axial flow, radial inflow, screw type or hybrid.Each low pressure compressor entrance connects air-source.
Decompressor 13,12 can be piston type, axial flow, radial inflow, screw type or hybrid.Decompressor is appellation turbine engine or turbo machine also, is the machine transformation of energy be accumulated with in fluid working substance being become mechanical work.
Cold-storage heat-exchanger 3 can be one or more combination of tubular type, board-like, tubular fin type and plate-fin heat exchanger.
Each connecting tube all can be provided with valve, and valve location can be arranged as required.
Pipeline between liquid container 5 and air separation subtense angle S2 is also provided with at least one cryopump 7.
Cryopump 7 is reciprocating, centrifugal or hybrid cryopump.
Cryogenic gas discharged by low-pressure expansion machine 13, is connected with cold-storage heat-exchanger 3 through pipeline 29.It is important to note that, of the present invention based in the energy comprehensive utilization system of supercritical air, only need when high pressure expansion machine 12 does not input low temperature nitrogen to open valve 15, that is, it is only the air be only after the swollen machine 13 of low pressure expands flow through in pipeline 29 when high pressure expansion machine 12 does not input low temperature nitrogen, other times throttle down 15, open valve 11, what make to flow through in pipeline 29 and expansion unit is the nitrogen that purity is higher, thus reduce the corrosion of pipeline and expansion unit and aging, extend lifetime of system.
Motor 1 is by the propeller shaft couplings of coupling and compressor bank 2; Generator 14 is by the propeller shaft couplings of coupling and expansion unit.
Compressor is connected with low-pressure expansion machine through pipeline 30.After opening machine for compressor, when expansion unit can not provide low temperature nitrogen to cold-storage heat-exchanger 3, expanded by low-pressure expansion machine 13, form Cryogenic air, initial compression Air flow is lowered the temperature.Although what now flow through in pipeline 29 and low-pressure expansion machine 13 is air, the time is shorter, because this reducing corrosion and aging.Compressor high-pressure air connects cold-storage heat-exchanger 3 through main pipeline 18.Heat exchanger 3, through pipeline 19 and throttle valve 4, is connected with liquid container 5.
In pipeline 21, be provided with valve 6 and at least one cryopump 7, valve is positioned at the upstream of cryopump.
Where necessary, open valve 17, by pipeline 20, the cryogenic gaseous air in liquid container 5 is transported to cold-storage heat-exchanger 3 through cold air outlet.Can throttle down 17 when cold-storage heat-exchanger 3 has enough low-temperature receivers.
Pipeline 28 connects the cold air outlet of air separator 9 or gaseous nitrogen atmosphere outlet and the generator cooler be integrated on generator.The gaseous nitrogen atmosphere outlet of preferred connection air separator 9 be integrated in generator cooler on generator, the corrosion of generator cooler and aging can be reduced like this.
The oxygen that air separator 9 is separated is sent through pipeline 22; Nitrogen, after heat exchange tank 10, is connected with high pressure, low-pressure expansion machine through pipeline 23,24.
Fig. 3 is the flow chart of the comprehensive energy utilization method based on supercritical air of the embodiment of the present invention.In conjunction with consulting Fig. 2 and Fig. 3, the method comprises the steps:
310, air liquefaction subtense angle S1 liquefies to air;
320, the air of air separation subtense angle S2 to post liquefaction is separated to obtain nitrogen and oxygen, by this nitrogen by Cemented filling to gas expansion power generation sub-system S3, and described oxygen is stored and/or outputs to external equipment;
330, the nitrogen that gas expansion power generation sub-system S3 utilizes this air separation subtense angle S2 to provide generates electricity.
As one embodiment of the present of invention, utilizing described air liquefaction subtense angle to carry out liquefaction to air in step 310 can comprise:
By the first pipeline 30 with valve 15 arranged between the first delivery outlet of air compressor unit 2 and low-pressure expansion machine 13, the low-pressure expansion machine 13 Partial shrinkage air being inputted this gas expansion power generation sub-system S3 expands, and produces cryogenic gas;
By the second pipe 29 arranged between this low-pressure expansion machine 13 and this cold-storage heat-exchanger 3, carry this cryogenic gas by low-pressure expansion machine 13 to described cold-storage heat-exchanger 3;
This cold-storage heat-exchanger 3 is utilized to liquefy to the pressurized air that the second delivery outlet from air compressor unit 2 exports based on this cryogenic gas.
As one embodiment of the present of invention, in step 320, utilize the air of described air separation subtense angle to post liquefaction to be separated to obtain nitrogen and oxygen, give described gas expansion power generation sub-system by described nitrogen by Cemented filling, can comprise:
By being arranged on the pipeline 23 of the inlet opening being connected to the high pressure expansion machine 12 of gas expansion power generation sub-system S3 from the low temperature nitrogen delivery outlet of air separation subtense angle S2, by this air separation subtense angle S2 to this gas expansion power generation sub-system S3 conveying high-pressure low temperature nitrogen.
As one embodiment of the present of invention, method shown in Fig. 3 can also comprise step: by the pipeline 20 arranged between liquid container 5 to cold-storage heat-exchanger 3, by this liquid container 5 to this cold-storage heat-exchanger 3 transporting low temperature gas.
As one embodiment of the present of invention, method shown in Fig. 3 can also comprise step: by the pipeline 33 arranged between air separation subtense angle S2 and the cold-storage heat-exchanger 3 of air liquefaction subtense angle S1, by this air separation subtense angle S2 to cold-storage heat-exchanger 3 transporting low temperature gas.
More specifically in detail, system operation of the present invention is:
Upon power-up of the system, compressor bank shortens a certain amount of air pressure into supercritical state.On the one hand, when valve 11 is closed, during without low temperature nitrogen supply expansion unit, Partial shrinkage air is delivered to after low-pressure expansion machine expansion work through pipeline 30 and is become Cryogenic air, cold-storage heat-exchanger 3 (can be multistage cold-storage heat-exchanger) is sent into, for the cooling of main pipeline high-pressure air, and when valve 11 is opened through pipeline 29, when having low temperature nitrogen to supply expansion unit, then throttle down 15; On the other hand, the high-pressure air in compressor bank main pipeline, cool after cold-storage heat-exchanger 3, most low temperature compressed air is liquefied after throttle valve, and sends into low-temperature liquid storage tank 5 and store as cold energy.A small amount of remaining gaseous state Cryogenic air turns back to cold-storage heat-exchanger 3 through pipeline 20, for providing part low-temperature receiver to cold-storage heat-exchanger 3.
System after having put aside a certain amount of liquid air in liquid container 5, has opened valve 6 after starting, cryopump 7 liquid towards air pressurized, high-pressure liquid air is warmed through oxygen-nitrogen separator 9, after reaching the supercritical state of nitrogen, make nitrogen ebullition, gasification, by nitrogen gasification separation from liquid air.Remaining liquid is the liquid oxygen of certain purity, opens valve 8 and is transported to oxygen conveying pipe through pipeline 22.Nitrogen after gasification absorbs heat through heat exchange tank 10 (or appellation heat exchanger), and (heat here can be that heat, blast furnace high-temperature gas heat exchanger, metallurgy, thermoelectricity, the manufacture of cement absorbed from the sun can produce a large amount of used heat, waste heat to follow-up temperature of continuing rising, if hot water tank heat exchange is not enough, also electric regenerative heat exchange room can be set up after hot water tank), improve the temperature needed for nitrogen expansion acting further.High pressure nitrogen drives high pressure expansion machine 12 through pipeline 23,24, low-pressure expansion machine 13 does work, and drive electrical generators generates electricity.If valve 15 is opened, then can after system start a period of time, the valve 15 in pipeline 30 is closed, low-pressure expansion machine relief opening discharges pure low temperature nitrogen, for the cooling of main pipeline air, and discharge through valve 16 from cold-storage heat-exchanger 3 outlet conduit 31, enter nitrogen gas delivery-line.As can be seen here, system main pipe 23,24,29,28 most time flows through the higher nitrogen of purity, but not oxygenous air, the corrosion to system pipeline and expansion unit can be reduced like this, lifetime of system is extended.
Energy comprehensive utilization system based on supercritical air of the present invention and method, it can be power supply that motor can be made to abandon wind-powered electricity generation mainly with power station valley electricity and wind-powered electricity generation, drives air-compressor set, using air liquefaction as cold energy raw material storage.Generate electricity can, be used for the power supply of smelting equipment and air compressor itself, also can by unnecessary electric energy feed-in electrical network.
Although do not draw in the drawings, of the present invention based in the energy comprehensive utilization system of supercritical air, in air compressing process, also comprise purification and the purifying of air, solid matter, moisture and foreign gas in removing air; Air purification and purifier apparatus are integrated in compressed air unit.
Of the present invention based in the energy comprehensive utilization system of supercritical air, compressor bank 2 overall pressure tatio is between 38 ~ 340.When for multiple compressors, coaxial series connection can be adopted, split axle pattern in parallel connects with driving source.
Of the present invention based in the energy comprehensive utilization system of supercritical air, expansion unit overall pressure tatio is between 38 ~ 340.When for multiple stage decompressor, coaxial series connection can be adopted, split axle pattern in parallel connects with generator shaft.
Of the present invention based in the energy comprehensive utilization system of supercritical air, compressor is piston type, axial flow, radial inflow, screw type or hybrid.
Of the present invention based in the energy comprehensive utilization system of supercritical air, decompressor is piston type, axial flow, centrifugal, screw type or hybrid.
At the energy comprehensive utilization system based on supercritical air of the present invention, the heat exchanger of cold-storage heat-exchanger 3, supercritical air is cooled to 81K ~ 150K (K is Kelvin temperature unit), its heat exchanger is one or the combination of tubular type, board-like, tubular fin type (as shown in FIG.) and plate-fin heat exchanger.
In cold-storage heat-exchanger, Cryogenic air and cool storage medium direct contact heat transfer or non-direct contact heat exchange, its heat exchange form is one in sensible heat cold-storage or solid-liquid phase change cold-storage or combination.The High-pressure supercritical air of heat exchanger to main pipeline cools.
The sensible heat cool storage medium adopted has one or more in sealing ice hockey, stone or concrete, aluminium strip dish or other metals; Solid-liquid phase change cool storage medium is phase transition temperature at the ammonia of 81K ~ 150K and the aqueous solution, salts solution, olefines, alkanes substance and compound thereof, one or more in alcohols and the aqueous solution thereof.Cool storage medium is stored in thermally insulated container.
When cold-storage heat-exchanger provides low temperature cold quantity not sufficient, install low-temperature expansion turbine engine additional or open valve 17, providing cold to supplement.
Of the present invention based in the energy comprehensive utilization system of supercritical air, liquid air low-temperature liquid storage tank 5 is low temperature storing tank or Dewar storage tank, and liquid air is that atmospheric pressure or under pressure power stores.
Of the present invention based in the energy comprehensive utilization system of supercritical air, cryopump 7 is reciprocating, centrifugal or hybrid, and liquid air is pressurized to 3.8MPa ~ 34Mpa, when multiple stage, is plural serial stage or parallel connection.
Of the present invention based in the energy comprehensive utilization system of supercritical air, oxygen-nitrogen separator 9 points of high pressure, middle pressure, low pressure three class, be utilize oxygen different with the boiling point of nitrogen, realize the separation of nitrogen, and exported being still in liquid oxygen by pipeline 22, valve 8.
Of the present invention based in the energy comprehensive utilization system of supercritical air, heat exchange tank (also referred to as heat exchanger) 10, utilize waste heat, the used heat of the circulating water of the apparatus cools such as metallurgy, thermoelectricity, cement furnace, make high pressure nitrogen be warmed up to more than 300K further by heat exchanger.Heat exchanger 10 is one or the combination of tubular type, board-like, tubular fin type and plate-fin heat exchanger.
Of the present invention based in the energy comprehensive utilization system of supercritical air, waste heat, used heat can be power plant, cement industry, the waste heat of metallurgy industry and used heat, and native system machine runs the waste heat and used heat that produce.
Of the present invention based in the energy comprehensive utilization system of supercritical air, when energy storage, regulate energy storage capacity by the air inflow controlling first order compressor.
Of the present invention based in the energy comprehensive utilization system of supercritical air, adjusting air inflow quantity is by regulating compressor load, start/stop time, start-stop Partial shrinkage machine or regulating pressure ratio to realize the control of air inflow.
Of the present invention based in the energy comprehensive utilization system of supercritical air, when utilizing nitrogen energy storing and electricity generating, regulate generating capacity by the liquid air air inflow controlling air separation subtense angle S2.
Obviously, those skilled in the art will readily appreciate that, can in systems in which on all duct routes, all kinds of valve is installed in any position of valve that needs, or adjusts the relative position of valve and miscellaneous part as required.In the accompanying drawings, do not mark the pipeline place of valve, valve can be set as required yet.
Native system carries out high-efficiency comprehensive utilization to the energy, has following advantage: comprehensive utilization of energy rate is high; Energy-saving and cost-reducing, reduction cost of production, improves the economic benefit of enterprise; Environmentally friendly; Lifetime of system is long.Be applicable to the metallurgy of various scale, thermoelectricity and cement production enterprise, reduce the consumption of business capital inputs and resources, there is wide prospect of the application.
The comprehensive utilization of resource and the energy: the present invention utilizes paddy electricity and wind-powered electricity generation to abandon wind-powered electricity generation energy, carries out the overcritical energy storage of liquid air and prepared by oxygen, nitrogen; Utilize the cold of low temperature nitrogen
realize the cooling of circulating water, reduce circulating water temperature; Recycle High Temperature High Pressure nitrogen generating after being heated.The liquid oxygen generated is admitted to oxygen therapy pipeline, for purposes such as blast furnace steel-makings; The nitrogen of finally discharging is utilized by tinning.System very effectively utilizes resource and the energy, does not almost waste.
Energy-saving and cost-reducing, reduce cost of production, improve the economic benefit of enterprise: metallurgy, thermoelectricity, manufacture of cement can produce a large amount of used heat, waste heat, if do not fully utilized, can cause a large amount of energy wastes.The present invention not only achieves the recovery of used heat, waste heat, and achieves effective utilization of resource, will effectively reduce enterprise's cost of production, to produce the cement production enterprise of 1,640,000 tons per year, at least can be the economic benefit that enterprise brings 1,500 ten thousand yuan.
Environmentally friendly: this energy comprehensive utilization system does not relate to fossil fuel, not discharging any harmful matter, is complete environmental protection.
Belong to the energy-saving and cost-reducing system of a kind of novel high efficient energy sources comprehensive utilization, can use with the coordinative composition of equipments such as metallurgy, thermoelectricity, cement furnace.
Reflux in pipeline when releasing energy with system be always air legacy system compared with, the oxygen that legacy system has flowing causes the defect that system pipeline is aging soon, the life-span is short, there will be system cost also unrecovered come but the problem of system ageing failure, and not only need cold-storage heat-exchanger also to need regenerative heat exchanger in these systems, cause system complex, build the high problem of cost.Therefore, the invention provides a kind of system, can energy storage be solved, the system that can effectively release energy again, and system can be made to have the relatively long life-span, so that guarantee can not only cost-recovering, can also great economic benefit be brought.
Should be understood that, above-mentioned embodiment of the present invention only for exemplary illustration or explain principle of the present invention, and is not construed as limiting the invention.Therefore, any amendment made when without departing from the spirit and scope of the present invention, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.In addition, claims of the present invention be intended to contain fall into claims scope and border or this scope and border equivalents in whole change and modification.
Claims (12)
1. based on a comprehensive energy utilization method for supercritical air, described method is applicable to a kind of energy comprehensive utilization system based on supercritical air, and described system comprises: air liquefaction subtense angle, air separation subtense angle, gas expansion power generation sub-system; Described method comprises the steps:
Described air liquefaction subtense angle liquefies to air;
The air of described air separation subtense angle to post liquefaction is separated to obtain nitrogen and oxygen, gives described gas expansion power generation sub-system by described nitrogen by Cemented filling, and is stored by described oxygen and/or output to external equipment;
The nitrogen that described gas expansion power generation sub-system utilizes described air separation subtense angle to provide generates electricity,
It is characterized in that,
Described air liquefaction subtense angle comprises air compressor unit, cold-storage heat-exchanger and liquid container; Described air separation subtense angle comprises oxygen-nitrogen separator, heat exchanger; Described gas expansion power generation sub-system comprises the expansion unit be made up of at least one low-pressure expansion machine, at least one high pressure expansion machine by propeller shaft couplings and generator; Anyly in described air liquefaction subtense angle, described air separation subtense angle, described gas expansion power generation sub-system be provided with at least one pipeline between the two; Be provided with the pipeline being with valve between described air compressor unit and described low-pressure expansion machine, this pipeline is used for by described air compressor unit to described low-pressure expansion machine input compressed-air; Be provided with pipeline between described gas expansion power generation sub-system and described cold-storage heat-exchanger, this pipeline is used for by described gas expansion power generation sub-system to described cold-storage heat-exchanger transporting low temperature gas.
2. the method for claim 1, is characterized in that, describedly utilizes described air liquefaction subtense angle to carry out liquefaction to air to comprise:
By valvular first pipeline of band arranged between the first delivery outlet of air compressor unit and described low-pressure expansion machine, low-pressure expansion machine Partial shrinkage air being inputted described gas expansion power generation sub-system expands, and produces cryogenic gas;
By the second pipe arranged between described low-pressure expansion machine and described cold-storage heat-exchanger, carry described cryogenic gas by described low-pressure expansion machine to described cold-storage heat-exchanger;
Described cold-storage heat-exchanger is utilized to liquefy to the pressurized air that the second delivery outlet from described air compressor unit exports based on described cryogenic gas.
3. the method for claim 1, is characterized in that, the described air of described air separation subtense angle to post liquefaction that utilize is separated to obtain nitrogen and oxygen, gives described gas expansion power generation sub-system, comprising described nitrogen by Cemented filling:
By being arranged on the pipeline of the inlet opening being connected to the high pressure expansion machine of described gas expansion power generation sub-system from the low temperature nitrogen delivery outlet of described air separation subtense angle, by described air separation subtense angle to described gas expansion power generation sub-system conveying high-pressure low temperature nitrogen.
4. method as claimed in claim 2, it is characterized in that, described method also comprises:
By the pipeline arranged between described liquid container to described cold-storage heat-exchanger, by described liquid container to described cold-storage heat-exchanger transporting low temperature gas.
5. method as claimed in claim 2, it is characterized in that, described method also comprises:
By the pipeline arranged between described air separation subtense angle and the cold-storage heat-exchanger of described air liquefaction subtense angle, by described air separation subtense angle to described cold-storage heat-exchanger transporting low temperature gas.
6. the method according to any one of claim 1-5, is characterized in that, described air liquefaction subtense angle also comprises air purification and purifier apparatus, and described compressor bank adopts coaxial series connection or split axle parallel connection to connect with driving source.
7. method as claimed in claim 6, is characterized in that, described expansion unit adopts coaxial series connection or split axle parallel connection to connect with generator shaft.
8. the method for claim 1, is characterized in that:
Compressor in described air compressor unit is piston type, axial flow, radial inflow, screw type or hybrid;
Described decompressor is piston type, axial flow, radial inflow, screw type or hybrid.
9. the method for claim 1, is characterized in that:
Described cold-storage heat-exchanger is one or more combination of tubular type, board-like, tubular fin type and plate-fin heat exchanger.
10. the method for claim 1, is characterized in that:
Each connecting tube is provided with valve;
Pipeline between described liquid container and described air separation subtense angle is also provided with at least one cryopump.
11. methods as claimed in claim 10, is characterized in that:
Described cryopump is reciprocating, centrifugal or hybrid cryopump.
12. the method for claim 1, is characterized in that:
Heat exchanger in described air separation subtense angle is one or the combination of tubular type, board-like, tubular fin type and plate-fin heat exchanger.
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| CN105351020A (en) * | 2015-11-16 | 2016-02-24 | 南京师范大学 | System and method for reducing energy consumption of oxygen-enriched combustion power station based on nitrogen resource utilization |
| CN106050344B (en) * | 2016-06-14 | 2018-07-06 | 全球能源互联网研究院有限公司 | A kind of cold liquid air energy storage method of mixed working fluid moldeed depth and system |
| CN108266229B (en) * | 2018-01-12 | 2020-07-10 | 泉州装备制造研究所 | Adiabatic constant voltage compressed air energy storage system based on volatile fluid |
| CN112254361A (en) * | 2020-10-19 | 2021-01-22 | 中国科学院理化技术研究所 | Liquid air energy storage system adopting electric drive for air inlet precooling |
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