太阳能光热
分类: 太阳能光热  发布时间: 2013-04-15 10:22 

太阳能光热
The Theory and Superiority of Concentrating Solar Power (CSP) Technology

 

The Concentrating Solar Power (CSP) Technology, also known as solar-thermal power generation technology, reflecting and focusing the sunlight and then warming up the heat conduction medium, exchanging heat energy with high pressure water in order to produce high temperature and high pressure steam, so that it can drive the steam-turbine generator to produce electricity. Except for the usage of a "solar energy boiler” for heating, there is no difference on working principle comparing to thermal power as well as nuclear power. Its advantage is displayed as follows:

1The only renewable energy technology which can make low cost for energy storage, meanwhile it is carbon-free and non-discrete;

2The energy consumption of equipment manufacture is 1/10 of the photovoltaic, thus we can take advantage of the most existing energy facilities;

3We can make comprehensive utilization of high efficiency of industrial heating, high efficient power generation, waste heat for refrigeration and water purification and so on.

4No secondary disasters: In the major natural disasters such as earthquake and tsunami, it is not like nuclear power, water and electricity to cause secondary disaster, it is safe and reliable.

 

There are 4 current internationally available kinds of CSP Technology: the disc type, the slot type, the tower type and the Linear Fresnel.

n Disc type system (two-dimensional parabolic focusing): high efficiency, big wind resistance, wasteful of land, no heat storage, and high system cost. (See figure 1)

 n Slot type system (one-dimensional parabolic focusing): mature technology, less occupation, low efficiency, big wind resistance, difficulty of production and high cost; (See figure 2)

 

 

n Tower type system (two-dimensional Fresnel module heliostat  ) : high operating temperature, low optical efficiency, difficult tracking , high cost(See figure 3)

  

n Linear Fresnel system (one-dimensional module heliostat ) : low cost, less occupation, low optical efficiency, low temperature, low power generation efficiency (See figure 4)

 

         The existing bottlenecks of Concentrating Solar Power (CSP) Technology

        As regard to the existing CSP technology, here still come some bottlenecks for its large-scaled implement.

1Technical solution is difficult to give attention to both high efficiency and low cost, and the energy costs are much higher than    traditional fossil fuels;

2Higher geographic resource requirements: Higher land flatness (e.g. gradient of no more than 3); more than 2000 KWH/m2 per year of straight optical radiation; plenty of freshwater to meet the need for the consumption of evaporation when the turbine cools down, etc.

 

Three breakthroughs in energy technology

Our self-developed " Modular HeliostatConcentration Solar Power System" make three key breakthroughs of the existing photothermal technology from 3 aspects.:

1、      High efficiency: Typically the amount of annual solar radiation just requires more than 1500 KWH/m2; with low cosine loss and without differences on the optical efficiency comparing to the disc type; greatly reduce the system heat loss via the creations of materials, solar collector structure and the distribution in topology network of solar collector and so on.

2、      Wind resistance: by using the two-dimensional Fresnel focusing mirror (the miniature mobile tower type), we achieve to greatly low down the wind resistance and its corresponding cost.

3、      Low cost: Bring to the original Quasi 2 d trackingmode, we are able to make the two-dimensional tracking focusing based on the one dimensional tracking cost; There is no special requirement for ground slope.

  

 

 

MH-CSP’s Advantages

  The Modular Heliostat–Concentration Solar Power System (MH-CSP) has the following significant advantages:

1Higher efficiency: The system thermal conversion efficiency is more than 60%, and this is well above the general international focus solar-thermal technology at more than 20%.

2Lower cost: With its low cost, it can compete with fossil fuels and bring good returns for the owner; low cost of civil work as well as the installation; low cost of module; due to the China-manufactured Power Island, there is no need for expensive production equipments and special materials, meanwhile, with low productive investment; low storage cost.

3. Wider usage: Can be widely used in industrial heating, solar-thermal power, seawaterdesalination and the central air condition; the comprehensive utilization of energy can be higher than 50%.

4. Stronger geography/climate applicability: it can bear strong wind and has been proved that it is able to resist the Sanya Typhoon at Grade 12; with reduced demand for the annual solar radiation along with the land flatness.

5. Realizable zero covers: we can achieve the “zero covers” by making a perfect combination of the lighter device and the facility agriculture as well as variety of forms and scales of architecture.

 

Here comes a list below on a comparison between this technology and other energy technology:

Sort

Technology

Generator

System Efficiency

Wind Resistance

Possibility of energy storage

System cost    Yuan/W

Generating CostLEC    Yuan/Degree

Fossil

Coal

Turbonator

35%

Strong

Yes

6

0.27

Nuclear power

Turbonator

23%

Strong

Yes

34

0.35

Hydro Power Three Gorges Project

Water turbine

N/A

Strong

Yes

24

0.21

Wind power

Generator

N/A

Medium

No

15

0.45

Solar

Photovoltaic PV

silicon

Photoelectric cell

13%

Medium

No

22

1.36

film

Photoelectric cell

8%

Medium

No

17

1.02

Focus sunlight CSP

Disc type

Sterling

 

 

Slot type

Turbonator

15%

Weaker

Yes

27

0.91

Tower heliostat

Turbonator

18%

Weaker

Yes

31

0.96

One-dimensional Fresnel

Turbonator

12%

Stronger

Yes

24

0.81

MH-CSP

Turbonator

25%

Strong

Yes

15

0.49

MH-CSP

Central air-condition

37%

Strong

Yes

12

0.43

                       

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The solar-thermal power generation

With this technique, we can reflects and focuses the sunlight and then warming up the heat conduction medium, and exchanges heat energy with high pressure water in order to produce high temperature and high pressure steam, so that it can drive the steam-turbine generator to produce electricity, at length, to meet the civil and industrial large-scale electricity demand

The solar energy industry heating

By taking measures of focusing method, we can gain high temperature thermal energy and have sun-heat in stead of coal boiler in order to heat water to produce steam, thus providing direct steam heat source for the industrial production.

Solar central air-conditioning

When there is sunshine, it will convert the sunlight into heat energy, and it can provide the building air- conditioning or heating via the refrigeration and heating system; when there is no sunshine, it can keep the continue operation as a result of its own thermal storage, meanwhile, it can output power via gas.

Solar central air-conditioning 

Converting the sunlight into heat energy, and make use of the water purification system of low temperature multi-effect evaporation mode, we can fulfill desalination or sewage treatment in order to provide high quality drinking water and industrial water for our living city.

Complementation between wind and light

         Taking advantages of one same field and give a combination of wind-field, we can overcome the intermittent defects of wind power.

  

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