CN105065218A - Multi-stage single-screw line-focusing solar heat and electricity co-generation system integrating fused salt heat storage - Google Patents
Multi-stage single-screw line-focusing solar heat and electricity co-generation system integrating fused salt heat storage Download PDFInfo
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- CN105065218A CN105065218A CN201510557925.0A CN201510557925A CN105065218A CN 105065218 A CN105065218 A CN 105065218A CN 201510557925 A CN201510557925 A CN 201510557925A CN 105065218 A CN105065218 A CN 105065218A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/40—Solar thermal energy, e.g. solar towers
- Y02E10/46—Conversion of thermal power into mechanical power, e.g. Rankine, Stirling or solar thermal engines
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Abstract
The invention discloses a multi-stage single-screw line-focusing solar heat and electricity co-generation system integrating fused salt heat storage. Solar radiation is focused to heat internally flowing fused salt through a coating-aluminum novel tank type concentrating collector, and the heated fused salt enters an evaporator to heat circulating working media; the circulating working media are changed into steam after being heated, and the steam enters all stages of single-screw expansion machines back and forth to do work by expansion to drive an engine to generate electricity; the expanded dead steam enters a heat regenerator to be preheated and then enters a hot water heat exchanger to be condensed to be in a liquid state, the liquid-state working media enter the heat regenerator through pressurization of a working medium circulating pump and then return back to the evaporator for the next circulation. The heated hot water in the hot water heat exchanger enters resident families through pipelines to supply life needs such as heating and domestic hot water to the resident families. The system is simple in structure, convenient to process and mature and reliable in equipment; generation loads and heating loads can be adjusted as needed and are not influenced by the fact that solar radiation does not exist and is low at night and in rainy days; heat and electricity co-generation is adopted, and therefore the solar heat utilization ratio is improved while the life quality of people is improved.
Description
Technical field
The present invention relates to a kind of novel groove type solar cogeneration system, belong to solar energy heat utilization field.
Background technique
The electric load of China is mainly distributed in eastern region, and electric power resource is mainly distributed in western part and northern territory.In structure and space layout, China's electric power resource faces series of problems: as unreasonable in power supply architecture, exploitation dynamics is not mated and Power System Interconnection is made slow progress, and power industry is adjusting and optimizing urgently.At present, China still has 7,656 ten thousand without electric population, 16 Ge Wu electricity counties, 828 Ge Wu electricity townshiies and 29783 Ge Wu electricity villages.These county towns, villages and small towns and live scattered and herd family and be located in outlying, away from electrical network, the little and dispersion of power load.Many areas are still to burn bavin, and cause biomass utilization amount to exceed Appropriate application amount, ccd area progressively expands, and grassland area constantly reduces, and some areas forest Caiyu is lacked of proper care, and disaster is frequent, Which Ecological Environment Faced serious threat.
Solar energy, as a kind of important renewable energy sources, will obtain large-scale development and utilization in Future Social Development.Solar energy has the general advantage of resource distribution, is especially just in time in repository for western China, adopts distributed solar energy CCHP technology to be the most real selection.Solar energy thermal-power-generating is owing to can adopt the large-scale heat storage technology of low cost, and therefore compared with solar energy power generating, solar energy thermal-power-generating solves solar energy resources and the unmatched contradiction of demand by accumulation of heat, is more suitable for the demand of distributed energy.
Generator unit is one of key technology of solar chp system.External solar heat power generation system generally adopts conventional vapor turbine as generator unit, but steam turbine unit is difficult to do little, and for China, the generated output of minimum steam turbine is 800kW, cannot adapt to the demand of China's distributed solar energy generating.Single-screw expander technology is a kind of technology that can utilize the heat engine of cogeneration, and its principle is steam ingress engine internal spline, and lead-screw rotates.Along with bolt rotary, the volume between teeth groove increases gradually, and medium step-down cooling expansion work, finally discharges from teeth groove end.Power exports from headscrew, drives electrical power generators.The power of single-screw expander between 3kW ~ 2000kW, just in time can compensate for steam turbine single-machine capacity and is difficult to do little defect.The steam of steam turbine can only be superheated vapor or saturated vapour, and single-screw expander can be superheated vapor, saturated vapour, vehicle repair major fluid or hydrothermal solution.In addition, single-screw expander can by adopting the working medium of different boiling, and its serviceability temperature scope can from 70 DEG C to 250 DEG C, and therefore single-screw expander is low-temperature electricity-generating equipment in one, is particularly suitable for above-mentioned distributed solar energy chp system and is suitable for.Compared with traditional steam turbine, single-screw expander has the following advantages: 1, structure is simple, and moving element is few; 2, stress balance, for ease of maintenaince; 3, smooth running, noise is low; 4, the efficiency under sub load is high; 5, reliability is high, and maintenance cost is low; 6, saturated vapour or superheated vapor state is applicable to, and not high to the quality requirements of feedwater.
Summary of the invention
The object of the invention is to design and be a set ofly applicable to efficient, the environmental protection of distributed heat CCHP, reliable and stable solar chp system, adopt the two-stage single-screw expander organic Rankine bottoming cycle of band backheat, and solve solar energy resources and the unmatched contradiction of demand by fused salt accumulation of heat.The feature of this system is: 1, adopt single-screw expander, efficiency is high, structure is simple, noise is low, the life-span is long, working medium strong adaptability, is applicable to the distributed solar power generation system of middle low temperature; 2, adopt fused salt as heat transfer accumulation of heat working medium, the heat transmission assemble slot-type optical collector and storage, have the advantages that running temperature is wide, operating pressure is low.
For achieving the above object, the technical solution used in the present invention is the multistage singe screw line-focusing solar cogeneration system of integrated fused salt accumulation of heat, and this system comprises plated film aluminium novel slot concentrating collector (1), heat storage salt cellar (2), cold storage salt cellar (3), vaporizer (4), single-screw expander (5), generator (6), regenerator (7), hot water exchanger (8), working medium circulating pump (9); Each group of plated film aluminium novel slot concentrating collector (1) is in parallel, and concentrating collector (1) internal flow of plated film aluminium novel slot has fused salt; The public output of each group of plated film aluminium novel slot concentrating collector (1) parallel connection is connected with vaporizer (4) one end, and the public input end that the other end of vaporizer (4) is in parallel with each group of plated film aluminium novel slot concentrating collector (1) is connected; Be provided with heat between each group of plated film aluminium novel slot concentrating collector (1) public output in parallel with vaporizer (4) one end and store up salt cellar (2), the other end of vaporizer (4) the public input end centre in parallel with each group of plated film aluminium novel slot concentrating collector (1) is provided with cold storage salt cellar (3).
Vaporizer (4) is connected with single-screw expander at different levels (5), single-screw expander at different levels (5) is connected with the input end of regenerator (7), the output terminal of regenerator (7) is connected with hot water exchanger (8) one end, the other end of hot water exchanger (8) is connected with working medium circulating pump (9), and cycle fluid again heats through regenerator (7) and enters vaporizer (4) after working medium circulating pump (9) pressurization.
Described single-screw expander at different levels (5) is single-stage or multilevel hierarchy, and its Placement is in parallel or connects or series-parallel connection.
Described single-screw expander (5) is connected with motor (6).
Described single-screw expander (5) is nonmetal-metal screw star wheel rotor auxiliary structure.
The workflow of this system is as follows: solar radiation through one group or the fused salt organizing plated film aluminium novel slot concentrating collector (1) the focal heat internal flow with journey installation in parallel more, a fused salt part after heating is stored in heat storage salt cellar (2) for night and overcast and rainy generating and heat supply, another part enters vaporizer (4) Heating Cyclic working medium, a fused salt part after cooling is stored in cold storage salt cellar (3), and a part returns plated film aluminium novel slot concentrating collector (1).Become steam after cycle fluid is heated, front and back enter single-screw expander at different levels (5) expansion work, drive motor (6) generating.
Exhaust steam after expansion enters regenerator (7) preheating and enters hot water heat exchanger (8) and be condensed into liquid state, and liquid refrigerant enters regenerator (7) by working medium circulating pump (9) pressurization and Returning evaporimeter (4) circulates next time.Entered resident family by the hot water after heating by pipeline in hot water heat exchanger (8), provide needed for heating, domestic hot-water etc. live to it.
In the solar chp system of the present invention's design, fused salt absorbs as the heat transfer accumulation of heat working medium of high temperature the heat that slot type solar energy condenser lens collects, and operating temperature is at 200 ~ 500 DEG C, and thermal capacity is large, storage density can reach 1000MJ/m
3; Single-screw expander is as power engine, and structure is simple, reliable operation, wide adaptability, and cycle fluid can adopt organic working medium, also can adopt water.This system total efficiency is according to accumulation of heat scale, heating form and heat supply temperature, and efficiency of utilization can reach 80% ~ 90%, has the cost performance that volume is little, efficiency is high, the life-span is long and good.
In the solar chp system of the present invention's design, single-screw expander (5) can be single stage format or multi-level form according to the Demand Design of actual power and operating pressure, and multilevel system can be designed to the structure such as series, parallel or series-parallel connection.Single-screw expander selects nonmetal-metal screw star wheel rotor secondary, and vibrate little, the life-span is long.
The invention has the beneficial effects as follows: this structure is simple, easy to process, equipment mature and reliable; Generation load and heating demand can adjust as required, by night and overcast and rainy without solar radiation and the low impact of radiation; Adopt cogeneration, while improving the raw rear quality of people, also improve solar thermal utilization rate.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the groove type solar cogeneration system based on single-screw expander and fused salt.
Fig. 2 is single-screw machine star wheel rotor structural representation.
Fig. 3 is singe screw air expander structure diagram.
In figure: 1, plated film aluminium novel slot concentrating collector, 2, heat storage salt cellar, 3, cold storage salt cellar, 4, vaporizer, 5, single-screw expander, 6, generator, 7, regenerator, 8, hot water exchanger, 9, working medium circulating pump.
Embodiment
Embodiment 1: the design of main points described in illustrating according to accompanying drawing, processing and install the groove type solar cogenerator of composition one group based on single-screw expander and fused salt, and it designs generating capacity 6kW, heat storage capacity 2.6 × 10
8j.Heat-transfer working medium is fused salt; Heat storage material is fused salt; Slot-type optical collector uniaxiality tracking, heats Molten Salt Heat Transfer working medium by the solar light focusing collected at heat collecting pipe.A fused salt part after heating enters heat storage salt cellar, and another part enters the generating of vaporizer Heating Cyclic working medium for two-stage single-screw expander.Exhaust steam after generating heat hot water in hot water heat exchanger, provides heating, domestic hot-water.This device adopts 2 groups of focusing ratio 80, heat-collecting area 140m
2slot-type optical collector.The generated output of this system is designed to 6kW, and the generated output at night can reach 3.6kW, can generate electricity and provide hot water for 24 hours.
Embodiment 2: the design of main points described in illustrating according to accompanying drawing, processing and install the groove type solar cogenerator of composition one group based on single-screw expander and fused salt, and it designs generating capacity 9kW, heat storage capacity 3.9 × 10
8j.Heat-transfer working medium is fused salt; Heat storage material is fused salt; Slot-type optical collector uniaxiality tracking, heats Molten Salt Heat Transfer working medium by the solar light focusing collected at heat collecting pipe.A fused salt part after heating enters heat storage salt cellar, and another part enters the generating of vaporizer Heating Cyclic working medium for two-stage single-screw expander.Exhaust steam after generating heat hot water in hot water heat exchanger, provides heating, domestic hot-water.This device adopts 3 groups of focusing ratio 80, heat-collecting area 210m
2slot-type optical collector.The generated output of this system is designed to 9kW, and night, generated output was 5.4kW, can generate electricity and provide hot water for 24 hours.
Embodiment 3: the design of main points described in illustrating according to accompanying drawing, processing and install the groove type solar cogenerator of composition one group based on single-screw expander and fused salt, and it designs generating capacity 27kW, heat storage capacity 1.17 × 10
9j.Heat-transfer working medium is fused salt; Heat storage material is fused salt; Slot-type optical collector uniaxiality tracking, heats Molten Salt Heat Transfer working medium by the solar light focusing collected at heat collecting pipe.A fused salt part after heating enters heat storage salt cellar, and another part enters the generating of vaporizer Heating Cyclic working medium for two-stage single-screw expander.Exhaust steam after generating heat hot water in hot water heat exchanger, provides heating, domestic hot-water.This device adopts 9 groups of focusing ratio 80, heat-collecting area 630m
2slot-type optical collector.The generated output of this system is designed to 27kW, and night, generated output can reach 16.2kW, can generate electricity and provide hot water for 24 hours.
Claims (3)
1. the multistage singe screw line-focusing solar cogeneration system of integrated fused salt accumulation of heat, is characterized in that: this system comprises plated film aluminium novel slot concentrating collector (1), heat storage salt cellar (2), cold storage salt cellar (3), vaporizer (4), single-screw expander (5), generator (6), regenerator (7), hot water exchanger (8), working medium circulating pump (9); Each group of plated film aluminium novel slot concentrating collector (1) is in parallel, and concentrating collector (1) internal flow of plated film aluminium novel slot has fused salt; The public output of each group of plated film aluminium novel slot concentrating collector (1) parallel connection is connected with vaporizer (4) one end, and the public input end that the other end of vaporizer (4) is in parallel with each group of plated film aluminium novel slot concentrating collector (1) is connected; Be provided with heat between each group of plated film aluminium novel slot concentrating collector (1) public output in parallel with vaporizer (4) one end and store up salt cellar (2), the other end of vaporizer (4) the public input end centre in parallel with each group of plated film aluminium novel slot concentrating collector (1) is provided with cold storage salt cellar (3);
Vaporizer (4) is connected with single-screw expander at different levels (5), single-screw expander at different levels (5) is connected with the input end of regenerator (7), the output terminal of regenerator (7) is connected with hot water exchanger (8) one end, the other end of hot water exchanger (8) is connected with working medium circulating pump (9), and cycle fluid again heats through regenerator (7) and enters vaporizer (4) after working medium circulating pump (9) pressurization; Described single-screw expander (5) is connected with motor (6).
2. the multistage singe screw line-focusing solar cogeneration system of integrated fused salt accumulation of heat according to claim 1, it is characterized in that: described single-screw expander at different levels (5) is single-stage or multilevel hierarchy, its Placement is in parallel or connects or series-parallel connection.
3. the multistage singe screw line-focusing solar cogeneration system of integrated fused salt accumulation of heat according to claim 1, is characterized in that: described single-screw expander (5) is nonmetal-metal screw star wheel rotor auxiliary structure.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106762487A (en) * | 2016-12-06 | 2017-05-31 | 中国科学技术大学 | Direct expanding solar heating chp system with two-stage accumulation of heat water pot |
| CN110767323A (en) * | 2019-10-14 | 2020-02-07 | 中国科学院合肥物质科学研究院 | Intermediate heat exchange system for nuclear fusion device |
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