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32-33 PV Solar Power Generation System CO2 Emission Reduction

Author: Source: Datetime: 2016-12-24 17:39:33
One is the CO2 emission index, which means that the PV system does not generate 1 kWh in one place, which is equivalent to reducing the CO2 emission. As the fuel structure of different national power plants vary greatly, this index is not the same, should be investigated and studied, the analysis calculated; but the potential of PV systems to reduce CO2 emissions, refers to the power unit of photovoltaic power output is equivalent to a new system to reduce CO2 Of the emissions, which also need to analyze and calculate.

CO2 emission index

Fossil fuels burn greenhouse gases, usually containing CO2, SO2,NOx, and other components.

(EIA) published in June 2008 Energy Outlook 2008DOE / EIA-0383 (2008) table table A18 and A8, finishing the global emissions of greenhouse gas emissions from 2005 to 2030 of the global energy-saving emission reduction The statistics and forecast results of the quantities are shown in Table 2-7.

Table 2-7 Statistics and forecast results of global greenhouse gas emissions from 2005 to 2030

year

2005

2006

2010

2015

2020

2025

2030

annual growth rate/%

CO2/(million tons)

2397

2344

2413

2519

2627

2771

2948

1.0

SO2/(million tons)

10.22

9.39

6.43

4.67

3.77

3.66

3.71

-3.8

NOx/(million tons)

3.64

3.41

2.33

2.11

2.11

2.14

2.16

-1.9

Hg/t

51.72

50.37

37.24

24.75

19.23

16.88

14.95

-4.9


It can be seen that the main greenhouse gases are CO2, and for the sake of quantification, CO2 emission reduction is usually used as a measure of the effect of reducing the temperature of the gas.

Conventional power plants generate greenhouse gases when burning fossil fuels, causing environmental pollution, and light systems are clean energy without any waste, so when the output of photovoltaic power system, you can avoid the same amount of electricity generated by the local power plant generated by greenhouse gases emission. Assessing the CO2 emissions of a PV system is usually measured by the Emission Index (EI). Is defined as the amount of CO2 emitted per kilowatt (kW / h) of CO2 emitted per kilowatt (kWh) of electricity produced by a power plant in a local (referred to as a country-wide) mix (using multiple fuels). That is, the PV system in the local power generation 1kWh dagger, the equivalent of reducing the number of CO2.

The CO2 emission index is mainly related to the fuel used in the power plant. The amount of CO2 emitted by different fuels is different when burning. For the clean energy such as hydropower, solar energy, wind energy and geothermal energy, CO2 emission is zero; The amount of greenhouse gas produced is not the same for other types of fuels. The amount of CO2 emitted per unit of fuel produced is called the Greenhouse Gas Emission Factor in tCO2 (MWh). According to the Joint Report, the GHG emission factors for different types of fuels in electricity production are given in Table 2-8 .

energy

tCO2/(MWh)

energy

tCO2/(MWh)

nuclear energy

0

oil

0.942

hydropower

0

natural gas

0.439

coal

0.999

solar, geothermal, tidal, wave, ocean, wind and so on

0


Because of the different fuel components used, the CO2 emission index of each country varies greatly. The average CO2 emission reduction index of the world is 0.6kg (kWh). There are two ways to determine CO2 emissions.

(1) According to different types of fuels generate electricity calculation

As long as the power consumption of the various fuel consumption and the corresponding fuel emission factor multiplied, you can get a variety of fuels CO2 emissions, the sum of all kinds of fuel after the year divided by the total generating capacity, can be obtained. Emission index.

According to Energy Outlook 2007 Schedule H7-H11 comprehensive sorting of China from 2004 to 2030 a variety of fuels !, see Table 2-9.

year

2004

2010

2015

2020

2025

2030

annual average change/%

oil

33

37

43

48

48

37

0.5

natural gas

11

22

35

53

82

126

9.7

coal

1658

2423

3122

3835

4554

5317

4.6

nuclear energy

48

64

135

217

283

329

7.7

Hydropower renewable energy

330

348

393

434

479

529

1.8

total power generation

2080

2894

3728

4587

5449

6339

4.4


For example, in Table 2-9, the CO2 emissions of various fuels in China in 2004 are listed in Table 2-10, based on the GHG emission factors of various fuels.

project

power generation

/(x105MWh)

problem gas emission factor/[tCO2/(MWh)]

CO2 emissions

/(x 105t)

oil

330

0.942

310.86

natural gas

110

0.439

48.29

coal

16580

0.999

16563.42

nuclear energy

480

0

0

hydropower renewable energy

3300

0

0

total

20800

 

16922.57


Therefore, China's CO2 emission index is

EI = 16922.57 X 105t / (20800 X 105MWh) = 0.8141 t /MWh = 0, 8141 kg (kWh)

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