CN101876488A - Method for arranging structure of heat exchange pipes of concrete heat storage system for solar thermal power generation - Google Patents
Method for arranging structure of heat exchange pipes of concrete heat storage system for solar thermal power generation Download PDFInfo
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- CN101876488A CN101876488A CN2009102727096A CN200910272709A CN101876488A CN 101876488 A CN101876488 A CN 101876488A CN 2009102727096 A CN2009102727096 A CN 2009102727096A CN 200910272709 A CN200910272709 A CN 200910272709A CN 101876488 A CN101876488 A CN 101876488A
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- 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
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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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/14—Thermal energy storage
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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
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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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
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Abstract
The invention relates to a method for arranging the structure of heat exchange pipes of a concrete heat storage system for solar thermal power generation, comprising the following steps: arranging a plurality of heat exchange pipes which are arranged equidistantly in a concrete heat storage block (5), connecting two ends of each heat exchange pipe with an inlet pipe (1) and an outlet pipe (7) through a connecting pipe, arranging an inlet control valve (2) and an air inlet and evacuation pipe (3) on each inlet pipe (1), arranging an air inlet and evacuation valve (4) on the air inlet and evacuation pipe (3), and arranging an outlet control valve (6) on each outlet pipe (7). The solar thermal power generation technology is made to be practical due to the adoption of the method. When the structure of the heat exchange pipes, which is arranged by the method, is used, the heat conducting medium is made to flow in the heat exchange pipes from the inlet pipes, then the switch and the flow rate are adjusted through the inlet control valves, the heat is exchanged by the heat exchange pipes and is stored in the concrete heat storage block, and the heat conducting medium is made to flow out of the heat exchange pipes from the outlet pipes. The invention reduces the power generation cost, improves the heat exchange and storage efficiency and ensures that the working temperature of the concrete heat storage system is 600-900 DEG C which is much higher than the use temperature of the prior molten salt.
Description
Technical field
The present invention relates to the solar energy thermal-power-generating heat reservoir, particularly relate to the heat exchange pipeline structure arranging method of a kind of solar electrical energy generation with heat accumulating.
Background technology
The heat accumulation conceptual design is the important technology in the solar steam generating, and the performance of heat accumulating and cost are one of the construction cost of decision large-sized solar power plant and principal element of operating cost.The heat accumulating that is used for solar electrical energy generation should satisfy following requirement: heat accumulating should have high energy density; Heat accumulating and heat exchanger fluid should have good heat conduction; Heat accumulating should have good chemistry and mechanical stability; Good chemical compatibility is arranged between heat accumulating and heat exchanger and the heat exchanger fluid; In heat accumulation and heat release cyclic process, answer completely reversibility; Low-cost.
Mainly contain fused salt (KNO as the heat accumulating in the solar steam generating at present
3, NaNO
3Or both mixtures), iron ore.But fused salt exist one very obvious defects be its stronger corrosivity, heat exchanging pipe and other affiliated facility are had very strong corrosion behavior, increased the operating cost of power plant thus, also reduced the security of system stability.The concrete heat accumulating is one of ideal candidates heat accumulating that is used for the solar steam generating owing to have plurality of advantages such as stable performance, cost is low, heat storage capacity is strong.Document 1 (Kakiuchi; Hiroyuki; Oka; Masahiro, US patent (No.5567346)) having reported Japanese scholar's United States Patent (USP), is the heat accumulating that primary raw material is formed with sodium sulphate, ammonium chloride, sodium bromide and ammonium sulfate wherein.Document 2 (Ross; Randy, US patent (No.5685151)) patent has reported then and has been used for the solar energy heat-storage material that major ingredients is a sodium chloride.Document 3 (Kadir Tuncbilek, Ahmet Sari, Sefa Tarhan et al.Lauric and palmiticacids eutectic mixture as latent heat storage material for low temperature heating applicationsEnergy, 2005,30 (5): 677-692), document 4 (Ahmet Sar1.Eutectic mixtures of some fatty acids for latentheat storage:Thermal properties and thermal reliability with respect to thermal cycling, EnergyConversion and Management, 2006,47 (9-10): 1207-1221) with document 5 (Atul Sharma, Lee Dong Won, D Buddhi and Jun Un Park.Numerical heat transfer studies of the fatty acids for different heatexchanger materials on the performance of a latent heat storage system Renewable Energy, 2005,30 (14): 2179-2187) reported under the low temperature, at the fatty acid phase-change heat-storage material of building use.Document 6 (DoerteLaing, Wolf-Dieter Steinmann, Rainer Tamme, Christoph Richter.Solid media thermal storage forparabolic trough power plants, Solar Energy, 2006,80 (10): 1283-1289) proposed to water the heat accumulating that material feeding is a matrix, but its thermal conductivity coefficient is less, and cost is higher.
The heat accumulating of reporting in the above document, or be that cost is too high, or can only use under low temperature, and the heat accumulating of using as solar energy must be considered the performance of its use under prerequisite cheaply.In fact, solar energy thermal-power-generating is own except heat accumulating, and most important is the direct heat exchange efficiency of heat accumulating and thermal medium, and from present disclosed document, Shang Weijian reports the pipeline configuration method for arranging in the solar heat power generation system.
Summary of the invention
The purpose of this invention is to provide the heat exchange pipeline structure arranging method of a kind of solar energy thermal-power-generating with the concrete heat reservoir, this method is not only to utilize a kind of cheaply novel modified concrete to be heat accumulating, what is more important is optimized design to the coupling between this heat accumulating and the pipeline, realizes the significantly raising of its combination property.
The present invention solves its technical problem and adopts following technical scheme:
The solar energy thermal-power-generating provided by the invention heat exchange pipeline structure arranging method of concrete heat reservoir, the layout that comprises pipeline and valve, specifically: be provided with concrete heat accumulation piece, the many equidistant heat exchange pipelines of arranging are housed in this concrete heat accumulation piece, the two ends of these heat exchange pipelines are communicated with inlet tube, outlet by tube connector respectively, inlet control valve and air inlet evacuated tube are housed on inlet tube, the air inlet exhaust-valve is housed on the air inlet evacuated tube, discharge control valve is housed on outlet.
The above-mentioned solar energy thermal-power-generating provided by the invention heat exchange pipeline structure arranging method of concrete heat reservoir, its purposes is: after arranging according to this method, during use, after heat-conducting medium flows to by inlet tube, come the size of by-pass cock and flow by inlet control valve, when the manifold pressure deficiency of inlet tube, pressurize, and when this manifold pressure is big, play depressurization by the air inlet evacuated tube; Heat-conducting medium carries out heat exchange during by the heat exchange pipeline in the concrete heat accumulation piece, stores energy in the concrete heat accumulation piece, flows out by outlet afterwards.
The present invention compared with prior art, its advantage mainly is: providing a kind of in solar heat power generation system is heat accumulating with the low cost new concrete, has greatly reduced cost of electricity-generating, make the solar energy thermal-power-generating technology push to practicability provide may.On structure, in heat-exchange system, increased blast pipe and air bleeding valve, improved the exchange rate of heat-conducting medium greatly, improve the efficient of heat accumulation and heat exchange.The operating temperature of the heat reservoir of this method preparation can be at 600-900 ℃, far above the serviceability temperature (can not be higher than 500 ℃) of the fused salt series of present use.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Fig. 2 is the structural section schematic diagram of heat accumulating of the present invention and pipeline.
Among the figure: 1. inlet tube; 2. inlet control valve; 3. air inlet evacuated tube; 4. air inlet exhaust-valve; 5. concrete heat accumulation piece; 6. discharge control valve; 7. outlet; 8. heat accumulating; 9. heat exchange pipeline.
The specific embodiment
The present invention is the heat exchange pipeline structure arranging method of solar energy thermal-power-generating with the concrete heat reservoir, the layout that comprises pipeline and valve, as shown in Figure 1: be provided with concrete heat accumulation piece 5, the many equidistant heat exchange pipelines of arranging 9 are housed in this concrete heat accumulation piece, the two ends of these heat exchange pipelines are communicated with inlet tube 1, outlet 7 by tube connector respectively, inlet control valve 2 and air inlet evacuated tube 3 are housed on inlet tube, air inlet exhaust-valve 4 is housed on the air inlet evacuated tube, discharge control valve 6 is housed on outlet.
What described inlet tube 1 adopted is large diameter stainless steel chromium plating heat resisting pipe, and its diameter is 16mm～30mm.
Described inlet control valve 2, air inlet exhaust-valve 4 and discharge control valve 6 are normally closed solenoid valve, can be controlled by time-delay relay.
What the material of described heat exchange pipeline 9 adopted is the stainless steel heat-resistant steel pipe, its arrangement mode be up and down and about equidistantly distribute.
Described concrete heat accumulation piece 5 is made by following method: with basalt aggregate, slag aggregate, aluminate cement, slag powders, silicon powder and these raw materials of concavo-convex rod dried be mixed even after, adding water makes it to mix and is placed in the punching block mould that heat exchange pipeline is housed, the demoulding after 24 hours, maintenance after 72 hours in the water under 20-25 ℃ of temperature, baking is 24 hours under 100-120 ℃ of temperature, obtain described concrete heat accumulation piece, its density of material is 2.98g/cm
3, compression strength is 50.2MPa, and rupture strength is 8.5MPa, and volumetric heat capacity is 145kWh/m
3, thermal conductivity is 1.75W/mK, refractoriness is 900 ℃.
Purposes of the present invention is: after arranging according to this method, during use, after heat-conducting medium flows to by inlet tube 1, come the size of by-pass cock and flow by inlet control valve 2, when the manifold pressure deficiency of inlet tube 1, pressurize, and when this manifold pressure is big, play depressurization by air inlet evacuated tube 3; Heat-conducting medium carries out heat exchange during by the heat exchange pipeline in the concrete heat accumulation piece 5, stores energy in the concrete heat accumulation piece 5, flows out by outlet 7 afterwards.
Described heat-conducting medium can adopt Viscosity Index to be less than or equal to 40 hot mineral oil, and flow velocity is 1m/s, and inlet temperature is 380 ℃, and pressure is 0.1MPa.
The invention will be further described below in conjunction with embodiment and accompanying drawing, but do not limit the present invention.
Embodiment 1:
Consisting of of heat accumulating 8: basalt aggregate 38%, slag aggregate 32%, aluminate cement 8%, slag powders 15%, silicon powder 5%, concavo-convex excellent 2%.Raw material through dried be mixed even after, add 6% water, mix and be placed in the punching block mould that heat exchange pipeline is housed, the demoulding after 24 hours, maintenance is after 72 hours in the water under 20-25 ℃ of temperature, baking is 24 hours under 100-120 ℃ of temperature, promptly obtains density 2.98g/cm
3, compression strength 50.2MPa, rupture strength 8.5MPa, volumetric heat capacity 145kWh/m
3, 900 ℃ of thermal conductivity 1.75W/mK and refractoriness the heat accumulation concrete.The variation of per ten minutes record out temperatures, by through after 1 hour, measuring outlet temperature is 380 ℃, shows the balance that reaches heat exchange.After 1000 hours, find that whole heat exchange system shape is intact, do not find that heat accumulating has crackle, between pipeline and the heat accumulation concrete in conjunction with intact, do not have tangible ablation phenomenon.Other does experiment, goes out to add 0.1MPa pressure in import, finds that the flow velocity of liquid is increased to 1.5m/s, and through 40 minutes, the temperature of outlet just reached 380 ℃, and the heat exchange rate that shows system increases along with the flow velocity of mineral oil and accelerates.
Embodiment 2:
Consisting of of heat accumulating 8: basalt aggregate 35%, copper ashes aggregate 35%, aluminate cement 6%, slag powders 17%, silicon powder 4%, concavo-convex excellent 3%.Raw material through prepare burden dried be mixed even after, add 5.5% water, mix and be placed in the punching block mould that heat exchange pipeline is housed, the demoulding after 24 hours, maintenance is after 72 hours in the water under 20-25 ℃ of temperature, and baking is 24 hours under 100-120 ℃ of temperature, promptly obtains density 2.96g/cm
3, compression strength 60.8MPa, rupture strength 12.2MPa, volumetric heat capacity 148kWh/m
3, 900 ℃ of thermal conductivity 1.77W/mK and refractoriness heat accumulating.The variation of per ten minutes record out temperatures, by through after 30 minutes, measuring outlet temperature is 450 ℃, shows the balance that reaches heat exchange.After 1000 hours, find that whole heat exchange system shape is intact, do not find that heat accumulating has crackle, between pipeline and the heat accumulation concrete in conjunction with intact, do not have tangible ablation phenomenon.Other does experiment, goes out to add 0.1MPa pressure in import, finds that the flow velocity of liquid is increased to 1.6m/s, and through 20 minutes, the temperature of outlet just reached 450 ℃, and the heat exchange rate that shows system increases along with the flow velocity of mineral oil and accelerates.
Embodiment 3:
Consisting of of heat accumulating 8: basalt aggregate 38%, copper ashes aggregate 32%, aluminate cement 7%, slag powders 16%, silicon powder 4%, concavo-convex excellent 3%.Raw material through prepare burden dried be mixed even after, add 5.5% water, mix and be placed in the punching block mould that heat exchange pipeline is housed, the demoulding after 24 hours, maintenance is after 72 hours in the water under 20-25 ℃ of temperature, and baking is 24 hours under 100-120 ℃ of temperature, promptly obtains density 2.98g/cm
3, compression strength 60.2MPa, rupture strength 11.5MPa, volumetric heat capacity 156kWh/m
3, 900 ℃ of thermal conductivity 1.88W/mK and refractoriness heat accumulating.The variation of per ten minutes record out temperatures, by through after 50 minutes, measuring outlet temperature is 350 ℃, shows the balance that reaches heat exchange.After 1000 hours, find that whole heat exchange system shape is intact, do not find that heat accumulating has crackle, between pipeline and the heat accumulation concrete in conjunction with intact, do not have tangible ablation phenomenon, heat-resisting pipeline also finds no tangible rusty stain, the corrosion.Other does experiment, goes out to add 0.1MPa pressure in import, and through 30 minutes, the temperature of outlet just reached 350 ℃, and the heat exchange rate that shows system increases along with the flow velocity of steam and accelerates.
Embodiment 4:
Consisting of of heat accumulating 8: basalt aggregate 39%, copper ashes aggregate 31%, aluminate cement 7.5%, slag powders 15.5%, silicon powder 3.5%, concavo-convex excellent 3.5%.Raw material through prepare burden dried be mixed even after, add 5.5% water, mix and be placed in the punching block mould that heat exchange pipeline is housed, the demoulding after 24 hours, maintenance is after 72 hours in the water under 20-25 ℃ of temperature, and baking is 24 hours under 100-120 ℃ of temperature, promptly obtains density 2.96g/cm
3, compression strength 61.5MPa, rupture strength 10.5MPa, volumetric heat capacity 152kWh/m
3, 900 ℃ of thermal conductivity 1.82W/mK and refractoriness heat accumulating.The variation of per ten minutes record out temperatures, by through after 60 minutes, measuring outlet temperature is 380 ℃, shows the balance that reaches heat exchange.After 1000 hours, find that whole heat exchange system shape is intact, do not find that heat accumulating has crackle, between pipeline and the heat accumulation concrete in conjunction with intact, do not have tangible ablation phenomenon, heat-resisting pipeline also finds no tangible rusty stain, the corrosion.Other does experiment, goes out to add 0.1MPa pressure in import, and through 25 minutes, the temperature of outlet just reached 380 ℃, and the heat exchange rate that shows system increases along with the flow velocity of steam and accelerates.
Embodiment 5:
Consisting of of heat accumulating 8: basalt aggregate 35%, copper ashes aggregate 35.5%, aluminate cement 7%, slag powders 16.5%, silicon powder 3.5%, concavo-convex excellent 2.5%.Raw material through prepare burden dried be mixed even after, add 5.8% water, mix and be placed in the punching block mould that heat exchange pipeline is housed, the demoulding after 24 hours, maintenance is after 72 hours in the water under 20-25 ℃ of temperature, and baking is 24 hours under 100-120 ℃ of temperature, promptly obtains density 2.92g/cm
3, compression strength 55.5MPa, rupture strength 9.5MPa, volumetric heat capacity 148kWh/m
3, 900 ℃ of thermal conductivity 1.86W/mK and refractoriness heat accumulating.The variation of per ten minutes record out temperatures, by through after 50 minutes, measuring outlet temperature is 360 ℃, shows the balance that reaches heat exchange.After 1000 hours, find that whole heat exchange system shape is intact, do not find that heat accumulating has crackle, between pipeline and the heat accumulation concrete in conjunction with intact, do not have tangible ablation phenomenon, heat-resisting pipeline also finds no tangible rusty stain, the corrosion.Other does experiment, goes out to add 0.1MPa pressure in import, and through 35 minutes, the temperature of outlet just reached 360 ℃, and the heat exchange rate that shows system increases along with the flow velocity of steam and accelerates.
Heat accumulating 8 in the foregoing description is the materials that are used to prepare concrete heat accumulation piece.
Claims (10)
1. a solar energy thermal-power-generating is with the heat exchange pipeline structure arranging method of concrete heat reservoir, the layout that comprises pipeline and valve, it is characterized in that: be provided with concrete heat accumulation piece (5), the many equidistant heat exchange pipelines of arranging are housed in this concrete heat accumulation piece, the two ends of these heat exchange pipelines are communicated with inlet tube (1), outlet (7) by tube connector respectively, inlet control valve (2) and air inlet evacuated tube (3) are housed on inlet tube, air inlet exhaust-valve (4) is housed on the air inlet evacuated tube, discharge control valve (6) is housed on outlet.
2. heat exchange pipeline structure arranging method according to claim 1, what it is characterized in that the material of heat exchange pipeline adopts is the stainless steel heat-resistant steel pipe, its arrangement mode be up and down and about equidistantly distribute.
3. heat exchange pipeline structure arranging method according to claim 1, what it is characterized in that inlet tube (1) employing is large diameter stainless steel chromium plating heat resisting pipe, its diameter is 16mm～30mm.
4. heat exchange pipeline structure arranging method according to claim 1 is characterized in that inlet control valve (2), air inlet exhaust-valve (4) and discharge control valve (6) are normally closed solenoid valve, are controlled by time-delay relay.
5. heat exchange pipeline structure arranging method according to claim 1 is characterized in that by weight, and concrete heat accumulation piece (5) is made by following raw material: basalt aggregate 38%, slag aggregate 32%, aluminate cement 8%, slag powders 15%, silicon powder 5%, concavo-convex excellent 2%.
6. heat exchange pipeline structure arranging method according to claim 5, it is characterized in that with raw material dried be mixed even after, add water by 6% of its weight, mix and be placed in the punching block mould that heat exchange pipeline is housed, the demoulding after 24 hours, maintenance is after 72 hours in the water under 20-25 ℃ of temperature, and baking is 24 hours under 100-120 ℃ of temperature, obtains concrete heat accumulation piece (5).
7. heat exchange pipeline structure arranging method according to claim 6, the density of material that it is characterized in that concrete heat accumulation piece (5) is 2.98g/cm
3, compression strength 50.2MPa, rupture strength 8.5MPa, volumetric heat capacity 145kWh/m
3, thermal conductivity 1.75W/mK, 900 ℃ of refractoriness.
8. according to the purposes of the described heat exchange pipeline structure arranging method of arbitrary claim in the claim 1 to 6, it is characterized in that according to after this method layout, during use, after heat-conducting medium flows to by inlet tube (1), the size of coming by-pass cock and flow by inlet control valve (2), when the manifold pressure deficiency of inlet tube (1), pressurize, and when this manifold pressure is big, play depressurization by air inlet evacuated tube (3); Heat-conducting medium carries out heat exchange during by the heat exchange pipeline in the concrete heat accumulation piece (5), stores energy in the concrete heat accumulation piece (5), flows out by outlet (7) afterwards.
9. purposes according to claim 8 is characterized in that heat-conducting medium is hot mineral oil, and flow velocity is 1m/s, and inlet temperature is 380 ℃, and pressure is 0.1MPa.
10. purposes according to claim 9 is characterized in that the Viscosity Index of hot mineral oil is less than or equal to 40.
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| CN102168848A (en) * | 2011-04-18 | 2011-08-31 | 中国科学院电工研究所 | High-temperature concrete heat reservoir capable of generating steam directly |
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