CN103321861A - Dish solar power-heat cogeneration system based on singe-screw expander and molten salt - Google Patents

Dish solar power-heat cogeneration system based on singe-screw expander and molten salt Download PDF

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Publication number
CN103321861A
CN103321861A CN2013102796622A CN201310279662A CN103321861A CN 103321861 A CN103321861 A CN 103321861A CN 2013102796622 A CN2013102796622 A CN 2013102796622A CN 201310279662 A CN201310279662 A CN 201310279662A CN 103321861 A CN103321861 A CN 103321861A
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China
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enters
screw expander
molten salt
heating
heat
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CN2013102796622A
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CN103321861B (en
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马重芳
吴玉庭
张业强
杜春旭
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Beijing University of Technology
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Beijing University of Technology
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B10/00Integration of renewable energy sources in buildings
    • Y02B10/20Solar thermal
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/40Solar thermal energy, e.g. solar towers
    • Y02E10/44Heat exchange systems
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/40Solar thermal energy, e.g. solar towers
    • Y02E10/46Conversion of thermal power into mechanical power, e.g. Rankine, Stirling or solar thermal engines

Abstract

The invention relates to a dish solar power-heat cogeneration system based on a single-screw expander and molten salt and belongs to the field of solar power utilization. Solar radiation is condensed by a dish condenser (10) to a heating coil (1) so as to heat molten salt flowing by, part of the heated molten salt is stored in a storage tank (2), and the other part of the heated molten salt enters a molten salt heater (3) to heat a circulating medium. After being heated, the circulating medium turns into steam which enters the single-screw expander (4) and expands for work, and an engine (5) is driven to generate power. Expanded exhaust steam enters a regenerator (6) to preheat the circulating medium before the medium enters the molten salt heater (3), the medium enters a hot water heat exchange (7) and condenses into liquid, and the liquid medium is pressurized by a medium circulation pump (8) and enters next cycle. The heated hot water enters households through a pipeline. The dish solar power-heat cogeneration system is simple in structure and convenient to process; equipment is mature and reliable; generation load and heating load are adjusted as needed and are insusceptible to the lack of solar radiation and low solar radiation at night or in rainy days.

Description

A kind of disc type solar energy cogeneration system based on single-screw expander and fused salt
Technical field
The present invention relates to a kind of novel disc type solar energy cogeneration system, belong to solar energy heat utilization field.
Background technique
At present, China still has 7,656 ten thousand without electric population, 16 Wu Dian counties, 828 Wu Dian townshiies and 29783 Wu Dian villages.Be located in outlyingly because the family is herded in these county towns, villages and small towns and living scattered, away from electrical network, power load is little and disperse.Particularly the most of peasants and herdsmen's in Tibet life is with highly relying on biomass energy, and the biomass utilization amounts such as fuel wood, turf, udershrub, animal manure and stalk account for 50% of whole demand for energy.Many areas still to burn bavin as main, cause the biomass utilization amount to exceed reasonable utilization, and ccd area progressively enlarges, and the grassland area constantly reduces, and some areas forest is felled and grown imbalance, and disaster is frequent, the Which Ecological Environment Faced serious threat.
Solar energy has the general advantage of resource distribution, especially just in time is in the repository for western China, and adopting distributed solar energy CCHP technology is the most real selection.Therefore solar energy thermal-power-generating is compared with solar energy power generating owing to can adopt low-cost large-scale heat storage technology, and solar energy thermal-power-generating can solve 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 traditional steam turbine as generator unit, and is little but the steam turbine unit is difficult to do, and for China, the generated output of minimum steam turbine is 800kW, can't adapt to the demand of China's distributed solar energy generating.The single-screw expander technology is a kind of technology that can utilize the heat engine of cogeneration, and its principle is that steam enters the machine internal spline, and lead-screw rotates.Along with bolt rotary, the volume between teeth groove increases gradually, and medium step-down cooling is expanded and done work, and discharges from teeth groove is terminal at last.Power is exported from headscrew, drives the generator generating.The power of single-screw expander can between 3kW~2000kW, just in time remedy the steam turbine single-machine capacity and be difficult to do little defective.The steam of steam turbine can only be superheated vapor or saturated vapour, and single-screw expander can be superheated vapor, saturated vapour, stream-liquid two-phase flow body or hydrothermal solution.In addition, single-screw expander can be by adopting the working medium of different boiling, and its serviceability temperature scope can be from 70 ℃ to 250 ℃, so single-screw expander is a kind of middle low-temperature electricity-generating equipment, is particularly suitable for above-mentioned distributed solar energy chp system applicable.Compare with traditional steam turbine, single-screw expander has the following advantages: 1, simple in structure, moving element is few; 2, stress balance, for ease of maintenaince; 3, smooth running, noise is low; 4, the efficient under the sub load is high; 5, reliability is high, and maintenance cost is low; 6, be applicable to saturated vapour or superheated vapor state, and not high to the quality requirements of feedwater.
Summary of the invention
The objective of the invention is to design a cover and be applicable to efficient, the environmental protection of distributed heat CCHP, reliable and stable solar chp system, overcome the lubricated and integrity problem that original Stirling engine brings, and solve solar energy resources and the unmatched contradiction of demand by the fused salt accumulation of heat.The characteristics of this system are: 1, adopt fused salt as heat transfer accumulation of heat working medium, heat transmission and storage with dish formula condenser is assembled have the advantages that running temperature is wide, operating pressure is low; 2, adopt single-screw expander, efficient is high, simple in structure, noise is low, the life-span is long, the working medium strong adaptability, is applicable to the distributed solar power generation system of middle low temperature.
A kind of disc type solar energy cogeneration system based on single-screw expander and fused salt, comprise heating coil 1, storage salt cellar 2, molten salt heater 3, single-screw expander 4, generator 5, regenerator 6 and hot water exchanger 7, working medium circulating pump 8, pump for liquid salts 9 and dish formula condenser 10: solar radiation focuses to the fused salt that heating coil 1 interior heating is flow through through dish formula condenser 10, fused salt part after the heating is stored in the storage salt cellar 2 that links to each other with heating coil 1 and is used for night and overcast and rainy generating and heat supply, and another part enters the molten salt heater 3 Heating Cyclic working medium that link to each other with heating coil 1; The outlet of molten salt heater 3 links to each other with single-screw expander 4, becomes steam after cycle fluid is heated, and enters single-screw expander 4 expansion actings, and single-screw expander 4 is connected to motor 5 and drives motors 5 generatings; After exhaust steam after the single-screw expander 4 interior expansions enters cycle fluid before regenerator 6 preheatings enter molten salt heater 3 along pipeline, enter hot water heat exchanger 7 and be condensed into liquid state, liquid cycle fluid enters next time circulation of lava heater 3 beginnings by working medium circulating pump 8 pressurizations.Hot water after the hot water heat exchanger 7 interior heating enters resident family by pipeline, provides the lives such as heating, domestic hot-water required to it.
Described dish formula condenser 10 is installed with journey for one or more parallel connection.
Described cycle fluid adopts organic working medium or water.
In the solar chp system of the present invention's design, fused salt absorbs the heat that the disc type solar energy condenser compiles as the heat transfer accumulation of heat working medium of high temperature, and operating temperature is at 200~500 ℃, and thermal capacity is large, storage density can reach 1000MJ/m 3Single-screw expander is as power engine, simple in structure, 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, efficient is high, the life-span is long and good.
In the solar chp system of the present invention's design, single screw-rod engine 4 can be single-stage form or multistage form according to the Demand Design of actual power and operating pressure, and multilevel system can be designed to the structures such as series, parallel or series-parallel connection.That single-screw expander is selected is nonmetal-and the metal screw star wheel rotor is secondary, vibrates littlely, and the life-span is long.
The invention has the beneficial effects as follows: the present invention is simple in structure, and is easy to process, the equipment mature and reliable; Generation load and heating demand can be adjusted as required, are not subjected to night and overcast and rainy without solar radiation and the low impact of radiation; Adopt cogeneration, when improving the living rear quality of people, also improved the solar thermal utilization rate.
Description of drawings
Accompanying drawing 1, single-screw machine star wheel rotor structural representation;
Accompanying drawing 2, single screw rod air expander structure diagram;
Accompanying drawing 3 is based on the schematic diagram of the disc type solar energy cogeneration system of single-screw expander and fused salt.
The schematic diagram of the cogeneration system that accompanying drawing 4, many disc type solar energy heating coils compose in parallel.
Among the figure: 1, heating coil, 2, the storage salt cellar, 3, molten salt heater, 4, single-screw expander, 5, generator, 6, regenerator, 7, hot water exchanger, 8, working medium circulating pump, 9, pump for liquid salts, 10 dish formula condensers.
Embodiment
Embodiment 1: form one group of disc type solar energy cogenerator based on single-screw expander and fused salt according to the design of main points described in the description of drawings, processing and installation, its design generating capacity 5kW, heat storage capacity 2.16 * 10 8J.This device is by forming with lower member: heating coil 1, storage salt cellar 2, molten salt heater 3, single-screw expander 4, generator 5, regenerator 6 and hot water exchanger 7, working medium circulating pump 8, pump for liquid salts 9 and dish formula condenser 10.Fluid in the heating coil is fused salt; Heat storage material is fused salt; Dish formula condenser adopts double-axis tracking, and the solar light focusing of collecting is heated fused salt working medium at heating coil.Fused salt part after the heating enters the accumulation of heat of storage salt cellar, and another part enters the generating that molten salt heater Heating Cyclic working medium is used for single-screw expander.Exhaust steam after generating heat hot water in hot water heat exchanger provides heating, domestic hot-water.This device adopts 2 optically focused than 24, heat-collecting area 65m 2Dish formula condenser.The generated output of this system is designed to 5kW, and the generated output at night can reach 3kW, can generate electricity in 24 hours and hot water is provided.
Embodiment 2: form one group of disc type solar energy cogenerator based on single-screw expander and fused salt according to the design of main points described in the description of drawings, processing and installation, its design generating capacity 10kW, heat storage capacity 4.32 * 10 8J.This device is by forming with lower member: heating coil 1, storage salt cellar 2, molten salt heater 3, single-screw expander 4, generator 5, regenerator 6 and hot water exchanger 7, working medium circulating pump 8, pump for liquid salts 9 and dish formula condenser 10.Fluid in the heating coil is fused salt; Heat storage material is fused salt; Dish formula condenser adopts double-axis tracking, and the solar light focusing of collecting is heated fused salt working medium at heating coil.Fused salt part after the heating enters the accumulation of heat of storage salt cellar, and another part enters the generating that molten salt heater Heating Cyclic working medium is used for single-screw expander.Exhaust steam after generating heat hot water in hot water heat exchanger provides heating, domestic hot-water.This device adopts 3 optically focused than 24, heat-collecting area 86m 2Dish formula condenser.The generated output of this system is designed to 10kW, and night, generated output was 6kW, can generate electricity in 24 hours and hot water is provided.
Embodiment 3: form one group of disc type solar energy cogenerator based on single-screw expander and fused salt according to the design of main points described in the description of drawings, processing and installation, its design generating capacity 30kW, heat storage capacity 1.296 * 10 9J.This device is by forming with lower member: heating coil 1, storage salt cellar 2, molten salt heater 3, single-screw expander 4, generator 5, regenerator 6 and hot water exchanger 7, working medium circulating pump 8, pump for liquid salts 9 and dish formula condenser 10.Fluid in the heating coil is fused salt; Heat storage material is fused salt; Dish formula condenser adopts double-axis tracking, and the solar light focusing of collecting is heated fused salt working medium at heating coil.Fused salt part after the heating enters the accumulation of heat of storage salt cellar, and another part enters the generating that molten salt heater Heating Cyclic working medium is used for single-screw expander.Exhaust steam after generating heat hot water in hot water heat exchanger provides heating, domestic hot-water.This device adopts 10 optically focused than 24, heat-collecting area 90m 2Dish formula condenser.The generated output of this system is designed to 30kW, and night, generated output can reach 20kW, can generate electricity in 24 hours and hot water is provided.

Claims (4)

1. disc type solar energy cogeneration system based on single-screw expander and fused salt, it is characterized in that: it comprises heating coil (1), storage salt cellar (2), molten salt heater (3), single-screw expander (4), generator (5), regenerator (6) and hot water exchanger (7), working medium circulating pump (8), pump for liquid salts (9) and dish formula condenser (10): it is characterized in that: solar radiation focuses to the fused salt that heating is flow through in the heating coil (1) through dish formula condenser (10), fused salt part after the heating is stored in and is used for night and overcast and rainy generating and heat supply in the storage salt cellar (2) that links to each other with heating coil (1), and another part enters molten salt heater (3) the Heating Cyclic working medium that links to each other with heating coil (1); The outlet of molten salt heater (3) links to each other with single-screw expander (4), becomes steam after cycle fluid is heated, and enters single-screw expander (4) expansion acting, and single-screw expander (4) is connected to motor (5) and drives motor (5) generating; Exhaust steam after expanding in the single-screw expander (4) enters after regenerator (6) preheating enters the front cycle fluid of molten salt heater (3) along pipeline, enter hot water heat exchanger (7) and be condensed into liquid state, liquid cycle fluid enters next time circulation of lava heater (3) beginning by working medium circulating pump (8) pressurization.Hot water in the hot water heat exchanger (7) after the heating enters resident family by pipeline, provides the lives such as heating, domestic hot-water required to it.
2. a kind of disc type solar energy cogeneration system based on single-screw expander and fused salt according to claim 1, it is characterized in that: described dish formula condenser (10) is installed with journey for one or more parallel connection.
3. a kind of disc type solar energy cogeneration system based on single-screw expander and fused salt according to claim 1 is characterized in that: described cycle fluid employing organic working medium or water.
4. a kind of disc type solar energy cogeneration system based on single-screw expander and fused salt according to claim 1, it is characterized in that: single screw-rod engine (4) is single-stage form or multistage form, and multilevel system is designed to the structures such as series, parallel or series-parallel connection; Single-screw expander is selected, and nonmetal-metal screw star wheel rotor is secondary.
CN201310279662.2A 2013-07-04 2013-07-04 A kind of disc type solar energy cogeneration system based on single-screw expander and fused salt Active CN103321861B (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104196688A (en) * 2014-08-22 2014-12-10 张从尧 Molten salt electricity generation system with energy storage function
CN105065218A (en) * 2015-09-02 2015-11-18 北京工业大学 Multi-stage single-screw line-focusing solar heat and electricity co-generation system integrating fused salt heat storage
CN106121943A (en) * 2016-07-25 2016-11-16 衢州学院 A kind of screw expansion unit
CN107101394A (en) * 2016-02-23 2017-08-29 黄斌 A kind of concavo-convex focus lamp device of solar generating

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Publication number Priority date Publication date Assignee Title
CN101413719A (en) * 2007-10-17 2009-04-22 中国科学院工程热物理研究所 Tower type solar heat power generation system with double-stage thermal storage
CN102242699A (en) * 2010-05-12 2011-11-16 中国科学院工程热物理研究所 Double-stage heat storage trough type solar thermal power generation system
CN202971062U (en) * 2012-11-22 2013-06-05 飞秒光电科技(西安)有限公司 Trough type solar concentrating heat power generation device
CN203374438U (en) * 2013-07-04 2014-01-01 北京工业大学 Disc-type solar co-generation system based on single-screw expansion machine and fused salt

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101413719A (en) * 2007-10-17 2009-04-22 中国科学院工程热物理研究所 Tower type solar heat power generation system with double-stage thermal storage
CN102242699A (en) * 2010-05-12 2011-11-16 中国科学院工程热物理研究所 Double-stage heat storage trough type solar thermal power generation system
CN202971062U (en) * 2012-11-22 2013-06-05 飞秒光电科技(西安)有限公司 Trough type solar concentrating heat power generation device
CN203374438U (en) * 2013-07-04 2014-01-01 北京工业大学 Disc-type solar co-generation system based on single-screw expansion machine and fused salt

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104196688A (en) * 2014-08-22 2014-12-10 张从尧 Molten salt electricity generation system with energy storage function
CN105065218A (en) * 2015-09-02 2015-11-18 北京工业大学 Multi-stage single-screw line-focusing solar heat and electricity co-generation system integrating fused salt heat storage
CN107101394A (en) * 2016-02-23 2017-08-29 黄斌 A kind of concavo-convex focus lamp device of solar generating
CN106121943A (en) * 2016-07-25 2016-11-16 衢州学院 A kind of screw expansion unit
CN106121943B (en) * 2016-07-25 2018-10-19 衢州学院 A kind of screw expansion unit

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