CN202581929U

CN202581929U - Ground source cooling device applied to solar power generating system

Info

Publication number: CN202581929U
Application number: CN 201220079471
Authority: CN
Inventors: 刘阳
Original assignee: BEIJING ZHAOYANG ENERGY TECHNOLOGY Co Ltd
Current assignee: Beijing TeraSolar Photothermal Technology Co., Ltd.
Priority date: 2012-03-05
Filing date: 2012-03-05
Publication date: 2012-12-05
Anticipated expiration: 2022-03-05

Abstract

The utility model provides a ground source cooling device applied to a solar power generating system. The device comprises a circulating medium and an underground circulation cooling system. The underground circulation cooling system is arranged below a ground surface, and heat brought by the circulating medium is absorbed through soil under the ground surface and is released to the environment through the ground surface to achieve the aim of reducing temperature of the circulating medium. The device can utilize the advantage of land area occupied by a solar power generating system to the largest extent, has the advantages of being low in construction cost and simple and reliable to operate, and overcomes the limit that a turbine cooling system of a solar photo-thermal power generation technology can only utilize an air cooling technology in special areas.

Description

A kind of source, ground cooling device that is applied to solar power system

Technical field

The utility model relates to source, a kind of ground cooling device, relates in particular to source, the ground cooling device of solar power system.

Background technology

Earth surface receives the radiation of solar energy throughout the year; Total amount is approximately 2.6X1024J, and wherein about 50% by earth absorption, and half energy radiate with the long wave form; The remaining power that becomes water circulation, air circulation, plant growth makes ground surface usually about 15 ℃.The earth is according to the variation of temperature characteristic, and the crust layer of earth surface can be divided into three bands, that is: variable temperature band, zone of constant temperature and heat band; The variable temperature band, owing to receive the influence of solar radiation, its temperature has round the clock, time, century even longer cyclically-varying, its thickness is generally 15～20m; Range of temperature is almost nil in the zone of constant temperature, and its degree of depth is generally at 20-30m.

The notion of heat pump techniques Englishman the earliest at first puts forward, and one piece of paper that thomson in 1852 is delivered has been described a kind of device that connects compressor and decompressor, can be used to building and heating or cooling; Utilize the history of the earth source heat pump of buried heat exchanger tube heat exchanger can trace back to the earliest 1912 Switzerland Zuo Yili (H.Zoelly) a patent in; But real application that should technology is about nineteen fifty, and the U.S. and Britain have studied respectively and utilized the home-use heat pump of ground lower coil pipe as thermal source.

Along with renewable energy utilizations such as solar energy are flourish in the whole world; Solar energy heat build-up generating (CSP) progressively is familiar with by people; In CSP system conventional island steam turbine part; Cooling system occupies construction capital greatly, account for about 15% of totle drilling cost greatly, and operating cost is very high; In the abundant place of China's solar energy resources, be the barren desert area of water resource mostly, can't use water-cooling system; No matter can only adopt air cooling system that steam turbine is cooled off, be Direct Air-Cooled, or indirect air cooling power plant; Operation practice through decades proves it all is feasible.Be not in operation but do not get rid of air cooling system, the problem that exists various reasons to cause, as severe cold, heat, strong wind, system's design inadequately rationally, operational management is improper etc.What these problems had is resolved, facts have proved this point from the domestic 200MW Air-cooled Unit operation that has put into operation.From the systematic comparison of operation power station air cooling, direct air cooling system has main feature: (1) back pressure is high; (2) because force ventilated blower fan makes power consumption big; (3) force ventilated blower fan generation noise is big; (4) the steel platform takes up an area of, and is little than armored concrete tower; (5) benefit is bigger by about 30% than indirect cooling system, and area of dissipation is than cold lacking about 30%; (6) cost relatively economical, but integral body is still very high.

The temperature of photovoltaic conversion efficiency and photovoltaic cell self also has confidential relation in addition, and when the temperature of self progressively raise, photoelectric conversion efficiency also continued to drop; This characteristic especially significantly appears in condensation photovoltaic (CPV) application, and CPV receives the sunray of high power, needs the cooling of good self temperature, otherwise efficient can sharply descend, even photovoltaic cell all can be burnt out by the high temperature of self.Photovoltaic system is particularly in the concentration photovoltaic system, also needs low cost, highly reliable cooling system.

Therefore developing a kind of earth source heat pump that utilizes rejects heat to the face of land; Slowly heat release in environment again; Reach the technology that low-cost high-efficiency discharges the unnecessary heat that produces in the solar energy CSP electricity generation system; This technology is significant, and is inconvenient with the CSP construction cost height that brings, fluctuation of service, the maintenance that overcome air cooling technique, the shortcoming that loss is big.

Summary of the invention

According to analysis, the sunshine total amount of heat that ground surface receives comprises that mainly face of land diffuse reflection radiations heat energy and soil absorb heat; The heat that soil absorbs reaches the balance of heat through face of land long-wave radiation, water convection current, cross-ventilation, the plant required absorption heat of growing, and makes the surface temperature year-round average temperature about 15 ℃; Above-mentionedly can infer roughly that the ability of face of land release heat is quite huge, and in the shadow region, because of the no sunshine incident face of land, surface radiation heat and environment reach new balance, make that the mean temperature on the face of land will be for a long time less than 15 ℃; In addition, topsoil has huge quality, thereby has huge heat storage capacity and temperature inertia.So be utilized in the huge heat accumulation in the face of land, the heat-sinking capability of shadow region, the utility model proposes a kind of source, ground cooling device that can be applicable to solar power system, to overcome the problem that exists in the prior art.

The utility model provides a kind of source, ground cooling device that is applied to solar power system; Comprise circulatory mediator, underground circulating cooling system; It is characterized in that said underground circulating cooling system is arranged in below the face of land, through the soil below the face of land heat that circulatory mediator brings is absorbed; To the environment release heat, reach the purpose that reduces the circulatory mediator temperature through the face of land.

Further, also comprise the double loop heat-exchange system in the cooling device of source, said ground, implement the double loop cool cycles; The first circulatory mediator thermal source that said double loop heat-exchange system will get into first loop carries out the condensation cooling; The second circulatory mediator low-temperature receiver that its liberated heat is circulated in second loop is taken away, and is absorbed and is discharged to environment by the soil below the face of land when flowing through said underground circulating cooling system.

Further, source, said ground cooling device is applied to the photo-thermal power generation system, and said circulatory mediator is Steam Turbine thermal cycle working medium water-steam, and the Steam Turbine steam discharge is carried out the condensation cooling.

Preferably; When source, said ground cooling device is applied to the photo-thermal power generation system; Adopt said double loop heat-exchange system; Get into first loop and carry out the condensation cooling at the finish steam that gives off of steam turbine acting, the second circulatory mediator low-temperature receiver that its liberated heat is circulated in second loop is taken away, and discharges by material absorbing such as the soil below the face of land and to environment when flowing through said underground circulating cooling system.

Further, source, said ground cooling device is applied to photovoltaic generating system, with said circulatory mediator directly or indirectly to the photovoltaic cell cooling that circulates.

Preferably, source, said ground cooling device is applied to light gathering photovoltaic power generating system, with said circulatory mediator to the cooling that directly or indirectly circulates of condensation photovoltaic battery.

Further, said underground circulating cooling system is the heat exchange pipeline of arranged in arrays below the face of land; Preferably, said heat exchange pipeline is a plastic conduit, and said plastic conduit is PE, PE-X or PE-RT polyethylene kind pipeline.

Further, said heat exchange pipeline perpendicularly buried pipe is in soil, and said heat exchange pipeline perpendicularly buried pipe is in soil, and entire arrangement becomes single U type structure or double-U-shaped structure, obtains the heat of underground deep layer soil.

Further, said heat exchange pipeline horizontal coiled pipe is in surface soil, and integral level arranges to have big heat exchange area.

Preferably, said heat exchange pipeline is arranged in the soil below the face of land of shadow region of solar energy system, does not receive or receive limited solar radiation daytime basically, and temperature is lower and have a huge land use area.

Preferably, said heat exchange pipeline is arranged in the soil below the Fresnel array Jing Chang or the face of land, groove type solar Jing Chang bottom, has solar energy radiation still less, can obtain excellent more heat radiation cooling effect.

What need special theory is that the following soil material in this face of land is a generalized concept; When comprising soil itself; Also comprise the sand, stone and the moisture that are mixed in the soil material; The surface layer sand that comprises desert area comprises the rock of rock area surface layer and mixes filling perfusion material, comprises beach, top layer, marshland high-moisture compounding substances or the like;

Source, the ground cooling device of the utility model is embedded in below the face of land; Do not receive Exposure to Sunlight and can avoid operating personnel's touching to damage, and the soil caloric receptivity is big, can maximally utilise the advantage of the land area of solar energy mirror field area simultaneously; It is cheap to have construction cost; Run simple and reliable characteristics, and overcome present solar power station and can only build at the abundant relatively arid tract of solar energy resources, steam turbine cooling system can only adopt the limitation of air cooling technique; When reducining the construction costs, reduced a large amount of operation costs.

Description of drawings

Fig. 1 is a kind of source, ground cooling device first embodiment sketch map that is applied to solar power system of the utility model;

Fig. 2 is a kind of source, ground cooling device second embodiment sketch map that is applied to solar power system of the utility model;

Fig. 3 is circulating cooling system first embodiment of the underground circulating cooling system of the utility model;

Fig. 4 is circulating cooling system second embodiment of the underground circulating cooling system of the utility model.

The specific embodiment

With reference to the accompanying drawings the specific embodiments of the utility model is carried out detailed explanation.

Fig. 1 is a kind of source, ground cooling device first embodiment sketch map that is applied to solar power system of the utility model.As shown in Figure 1; Source, ground cooling device; Comprise underground circulating cooling system 1, circulatory mediator 2, underground circulating cooling system 1 is arranged in below the face of land, through the soil material below the face of land heat that circulatory mediator 2 brings is absorbed; To the environment release heat, reach the purpose that reduces circulatory mediator 2 temperature through the face of land.This system applies is in the solar light-heat power-generation system; The inner circulatory mediator 2 of said heat exchange pipeline is working-medium water-steam; Be used for the Steam Turbine thermodynamic cycle, the Steam Turbine steam discharge is carried out the condensation cooling, Steam Turbine 3 provides the circulatory mediator thermal source to underground circulating cooling system 1; Underground circulating cooling system 1 is arranged in below the face of land; Circulatory mediator 2 thermals source get into underground circulating cooling system 1 under the driving of circulatory aid 4; Through the soil material below the face of land to heat absorption and the face of land to the release of heat, be reached for the purpose that Steam Turbine 3 cools.

Steam Turbine 3 receives the superheated vapour of HTHP among Fig. 1; Under the promotion of water vapour, has only the output of the heat completion electric power of fraction; Need discharge by the entrained a large amount of heats of the steam of low-pressure low-temperature to the external world; The circulatory mediator 2 that this Steam Turbine 3 provides is the gaseous state of working-medium water-steam (thermal source), in the actual solar power system, need carry out condenses to low-temp low-pressure working-medium water-steam that steam turbine is discharged and discharge great amount of heat; Usual manner in the processing procedure is water-cooled and air cooling; Because the abundant zone of the most solar energy of China all is positioned at dry desert area, the source has dried up, and be inconvenient to implement water-cooling system steam turbine is cooled off; Construction cost is high carries out cooling processing with the complicated air cooling technique of operation and can only adopt; The utility model first embodiment utilization has made full use of slot type array solar Jing Chang, the layout feature of Fresnel array groove type solar Jing Chang especially, and required land area is vast, for example the land area of required 1,500,000 square meters of 50MWe unit; Sunlit earth surface is being arranged; About 50% incident earth surface sunshine heat is directly absorbed by earth institute; Half energy radiate with the long wave form, and the remaining power that becomes water circulation, air circulation, plant growth makes ground surface usually about 15 ℃; Further, underground circulating cooling system 1 is the heat exchange pipeline of arranged in arrays below the face of land, and for overcoming corrosion (particularly salt bases soil corrosion), heat exchange pipeline is preferably plastic conduit, for example is specially PE, PE-X or PE-RT polyethylene kind pipeline.The horizontal shallow embedding pipe of heat exchange pipeline is in soil; Obtain the heat of underground deep layer soil, entire arrangement becomes single U type structure or double-U-shaped structure, with obtain in axial direction to go up heat all with release; This heat exchange pipeline arranges that horizontal coiled pipe is in big surface layer; Integral level arranges that have big heat exchange area, the horizontal arrangement degree of depth for example is 0.5m.Accomplish the working-medium water of condensation and cooling; In the circulatory aid of flowing through 4, for example solar thermal collector passes through receiving the sunshine heat of assembling; Become the superheated vapour of high pressure-temperature once more; Be transported in the Steam Turbine 3 and generate electricity, become the gaseous state circulatory mediator thermal source condensation of low-temp low-pressure then, accomplish new circulation.

Heat exchange pipeline is embedded in below the face of land, do not receive Exposure to Sunlight and can avoid operating personnel's touching to damage, and the soil caloric receptivity is big; Can maximally utilise simultaneously the advantage of the land area of solar energy mirror field area; It is cheap to have construction cost, runs simple and reliable advantage, and overcomes present solar power station and can only build at the abundant relatively arid tract of solar energy resources; Steam turbine cooling system can only adopt the limitation of air cooling technique; When reducining the construction costs, when having reduced a large amount of operation costs, have good heat exchange and heat storage capacity; Examples of implementation are: the land area of required 1,500,000 square meters of 50MWe unit, heat exchange pipeline are arranged in the soil below the 0.5m, and input temp is 40 ℃, supposes that surface temperature is 10 ℃,, soil is limestone, its thermal conductivity 0.98W/mk; Specific heat capacity is 0.85kJ/kgK; Density is 2880kg/m3; The heat that steam turbine need discharge is approximately 100MW, and drain time is 24 hours; Suppose the face of land not to the environment release heat, and not to the soil release heat below 0.5 meter, then the heat of discharging every day can only make the soil moisture of this volume rise 0.25 ℃; Suppose that the face of land is 10W/m2k to the convection transfer rate and the radiation heat transfer coefficient sum of air; Then only needing air themperature and ground surface temperature to keep general 6.5 ℃ of temperature differences promptly can accomplish the cooling of this power (does not have on the face of land under the situation of sunlight incident or seldom sunlight incident; Surface temperature and environment temperature have certain temperature difference); And mostly the abundant zone of domestic solar energy density is the abundant zone of wind-resources; Its coefficient of heat transfer can be big a lot of than the coefficient of heat transfer of aforementioned calculation, have real good heat exchange property.

Fig. 2 is a kind of source, ground cooling device second embodiment sketch map that is applied to solar power system of the utility model; This source, ground cooling device is applied in the solar light-heat power-generation system; As shown in Figure 2; Mainly comprise source, ground cooling device, Steam Turbine 3, circulatory aid 4 among the figure; Wherein the source cooling device comprises underground circulating cooling system 1, circulatory mediator 2 and double loop heat-exchange system 5, implements double loop cool cycles heat exchange; First circulatory mediator (thermal source) that the double loop heat-exchange system will get into first loop carries out the condensation cooling; Second circulatory mediator (low-temperature receiver) that its liberated heat is circulated in second loop is taken away, and is absorbed and is discharged to environment by soil material when flowing through said underground circulating cooling system 1.Wherein Steam Turbine 3 forms one group of loop with double loop heat-exchange system 5, and the medium of inner loop is the first circulatory mediator 2-1; Wherein underground circulating cooling system 1 is arranged in below the face of land, and the circulatory mediator inner with double loop heat-exchange system 5 loop that forms is the second circulatory mediator 2-2; The first circulatory mediator 2-1 and the second circulatory mediator 2-2 carry out the exchange of heat in double loop heat-exchange system 5; The heat that the first circulatory mediator 2-1 is provided is passed to below the face of land through the second circulatory mediator 2-2; To the release of heat absorption and the face of land, reach the purpose that the first circulatory mediator 2-1 self-temperature descends in the Steam Turbine 3 through soil to heat; The second inner circulatory mediator 2-2 of heat exchange pipeline is an aqueous water; Preferably, contain antifreezing agent in the aqueous water of said second circulatory mediator.

Further; Underground circulating cooling system 1 is the heat exchange pipeline of arranged in arrays below the face of land; The inner loop medium is liquid second circulatory mediator, and because of the first circulatory mediator 2-1 that for a long time steam turbine is discharged carries out heat exchange, day freezing knot problem can not take place basically for it.Heat exchange pipeline can be plastic conduit, is specially PE, PE-X or PE-RT polyethylene kind pipeline, has good corrosion resistance.The heat exchange pipeline perpendicularly buried pipe obtains the heat of underground deep layer soil in soil, entire arrangement becomes single U type structure or double-U-shaped structure, and the degree of depth that this heat exchange pipeline is arranged can be 10-15m.Preferably, said heat exchange pipeline is arranged in below the face of land of shadow region, solar energy mirror field, and do not receive basically or receive limited solar radiation daytime, is beneficial to the release of the heat of ground surface to atmospheric environment, and has huge land use area.Preferably, said heat exchange pipeline is arranged in below the face of land of Fresnel array Jing Chang or groove type solar Jing Chang shadow region, has solar energy radiation still less, can obtain excellent more heat radiation cooling effect.Accomplish first circulatory mediator of condensation and cooling; In the circulatory aid of flowing through 4, for example solar thermal collector passes through receiving the sunshine heat of assembling; Become the superheated vapour of high pressure-temperature; Be transported in the steam turbine and generate electricity, become the gaseous working medium water-steam source of low-temp low-pressure then, accomplish new circulation.

Fig. 3 is circulating cooling system first embodiment of the underground circulating cooling system of the utility model; As shown in Figure 3, this underground circulating cooling system 1 is mainly used among the utility model device first embodiment, and it vertically is arranged in below the face of land; Has darker position relatively; Adopt double-U-shaped structural configuration, strengthen its ability, and reduce the quantity of vertically digging pit underground release heat.

Fig. 4 is circulating cooling system second embodiment of the underground circulating cooling system of the utility model; As shown in Figure 4; This underground circulating cooling system 1 is mainly used among second embodiment of the utility model; Its many with heat exchanger tube horizontal arrangement in shallow ground location, the following 0.5m in the face of land for example, heat exchanger tube is released to heat in the soil on shallow ground; The ability of the absorption heat through soil and huge heat exchange area are released to the heat that shallow ground absorbs in the atmospheric environment, accomplish the release of the heat of steam turbine.

What need specified otherwise is, this source, ground cooling device is applied to photovoltaic generating system, with said circulatory mediator to the photovoltaic cell cooling that directly or indirectly circulates; Especially be applied to light gathering photovoltaic power generating system, with said circulatory mediator to the cooling that directly or indirectly circulates of condensation photovoltaic battery; Through the circulatory mediator at the photovoltaic cell back of flowing through, the heat that photovoltaic cell is unnecessary is released in the circulatory mediator, reduces the problem of self, guarantees good conversion efficiency and service life; Formation medium thermal source perhaps was directly connected in underground circulating cooling system through ground cycle heat exchange system after circulatory mediator received heat; The heat that receives is released into the soil inside or the face of land indirectly or directly; After reaching the temperature decline purpose of medium thermal source itself, in the circulation that the unnecessary heat of photovoltaic cell of entering next round discharges.

Be maximization soil utilization rate, this top, heat exchanging pipe face of land soil that is applied to source, the ground cooling device of solar power system is implemented agricultural planting; When huge use tree and grass coverage is provided, prevent the antifreeze output that provides of winter of green vegetation effectively, also further reduced the desert area of solar energy mirror field.For obtaining the area of dissipation of higher primary school, source, ground cooling device is arranged in heat exchange pipeline below the face of land of shadow region of solar energy system; Be specially heat exchange pipeline and be arranged in Fresnel array Jing Chang or groove type solar Jing Chang bottom, obtain maximum usable floor area, minimum sunlight direct solar radiation, the most efficient cooling heat dissipation effect.

Mathematical, this utility model device can be applied to the cooling system in other industrial circle well.

Obviously, under the prerequisite of true spirit that does not depart from the utility model and scope, the utility model described here can have many variations.Therefore, all predictable to those skilled in the art changes all should be included within the scope that these claims contain.The utility model scope required for protection is limited described claims.

Claims

1. source, ground cooling device that is applied to solar power system; Comprise circulatory mediator, underground circulating cooling system; It is characterized in that said underground circulating cooling system is arranged in below the face of land, through the soil below the face of land heat that circulatory mediator brings is absorbed; To the environment release heat, reach the purpose that reduces the circulatory mediator temperature through the face of land.

2. a kind of source, ground cooling device that is applied to solar power system according to claim 1 is characterized in that, also comprises the double loop heat-exchange system in the cooling device of source, said ground, implements the double loop cool cycles.

3. a kind of source, ground cooling device that is applied to solar power system according to claim 1 is characterized in that source, said ground cooling device is applied to the photo-thermal power generation system, and said circulatory mediator is Steam Turbine thermal cycle working medium water-steam.

4. a kind of source, ground cooling device that is applied to solar power system according to claim 2; It is characterized in that; The first circulatory mediator thermal source that said double loop heat-exchange system will get into first loop carries out the condensation cooling; The second circulatory mediator low-temperature receiver that its liberated heat is circulated in second loop is taken away, and is absorbed and is discharged to environment by the soil below the face of land when flowing through said underground circulating cooling system.

5. a kind of source, ground cooling device that is applied to solar power system according to claim 1 and 2 is characterized in that source, said ground cooling device is applied to photovoltaic generating system, with said circulatory mediator directly or indirectly to the photovoltaic cell cooling that circulates.

6. a kind of source, ground cooling device that is applied to solar power system according to claim 5; It is characterized in that; Source, said ground cooling device is applied to light gathering photovoltaic power generating system, with said circulatory mediator to the cooling that directly or indirectly circulates of condensation photovoltaic battery.

7. a kind of source, ground cooling device that is applied to solar power system according to claim 1 and 2 is characterized in that said underground circulating cooling system is the heat exchange pipeline of arranged in arrays below the face of land.

8. a kind of source, ground cooling device that is applied to solar power system according to claim 7 is characterized in that said heat exchange pipeline is a plastic conduit.

9. a kind of source, ground cooling device that is applied to solar power system according to claim 7 is characterized in that said heat exchange pipeline perpendicularly buried pipe is in soil, and entire arrangement becomes single U type structure or double-U-shaped structure.

10. a kind of source, ground cooling device that is applied to solar power system according to claim 7 is characterized in that said heat exchange pipeline horizontal coiled pipe is in surface soil.

11. a kind of source, ground cooling device that is applied to solar power system according to claim 2 is characterized in that, the second inner circulatory mediator of said heat exchange pipeline is an aqueous water.

12. a kind of source, ground cooling device that is applied to solar power system according to claim 1 and 2 is characterized in that, said heat exchange pipeline is arranged in the soil below the face of land of shadow region of solar energy system.

13. a kind of source, ground cooling device that is applied to solar power system according to claim 13 is characterized in that, said heat exchange pipeline is arranged in the soil below the Fresnel array Jing Chang or the face of land, groove type solar Jing Chang bottom.

14. a kind of source, ground cooling device that is applied to solar power system according to claim 14 is characterized in that, top, said heat exchanging pipe face of land soil is implemented agricultural planting.