The Environmental Effect Analysis Of PV Power Plant Construction In Desert Gobbi

In the past few years, the phenomenon of power rationing emerged in many places in our country, which indirectly showed that our country has been facing severe energy crisis.Traditional thermal fire generation take coal as its main fuel, but coal is a kind of non-renewable fossil fuel, therefore it not only difficult in exploiting, but also polluting the air. Consequently, the energy utilization structure of our country needs to be changed and should develop clean energy vigorously. Solar power being the most potential clean energy, has been payed more and more attention by people because of its abundant restoration and generality as well as ecnomomic factors.There are vast desertification land in the northwest of China, which has been dicarded because of its fertility declination or desertification, therefore we can make use of its abundant solar power and build PV power plant on the desert gobbi. This solution not only can relieve the energy crisis in our country, but also make foll use of the vast land and finally reach the goal of managing the environment.This article takes the million kilowatt solar power demonstration base of Dong dong Tan, Jiuquan city as an example, through field study and collecting information, predicted the generated energy every year of the demonstration base, as well as the emission reduction, and finally estimate the every year ground temperature variation using thermodynamics formular. According to the fomular of evaporation capacity, we can predict the changing trend of soil moisture evaporation rate and relative humidity after the demonstration base is built. Base on the correlativity of relative humidity and precipitation, caculate the changing trend of precipation after the demonstration base is built. Finally according to the relativity ofvegetation cover and wind speed as well as the transport rate, we can find out the changing trend of wind speed and transport rate.Throughout analysis, we can have following conclusion:After the Dong Dong Tan million kilowatt solar power demonstration base is built and has been in motion, the average generating capacity every year is1.54billion kW-h, in the other hand is38.5billionkW-h in the25years life cycle of PV module. Comparing with the traditional thermal power generation, the demonstration base can reduce1.785billion kg CO2emission. As CO2is the main substance of causing global warming, so the construction of the demonstration base can mitigate global warming effectively. Solar power generation has crucial impact on controlling heavy metal pollution. Comparing with traditional thermal power generating, the demonstration base can reduce2.58×109mgAs,6.18×109mg Cr,6.667×109mg Pb,7.54×107mg Hg,7.22× 109mg Ni,1.03×108mgCd every year. In addition, the demonstration base can save5.19×108kg standard coal,1.563×108kg carbon dust, reduce4.62×104tSO2emmision as well as2.31×104kgNOx, moreover, it can also save large amount of thermal power generating water, and reduce the environment pollution manage expenses, therefore, the construction of Dong Dong Tan million kilowatt solar power demonstration base is of great significance in relieving energy crisis and protecting the environment.Large area of solar panels cover the ground and increase the roughness of the surface ground, which can play the role of sand-protecting barrier, and weaken the wind force near the ground surface. Moreover, as the vegetation cover will increase after the demonstration base is put into use, the vegetation will weaken the wind force and can finally prevent the wind from affecting the ground. With the reduce of the wind speed in the demonstration base, the transport rate also reduce, and the sediment in the wind-drift sand reduce either. The vegetation in the base in some extend played a role in stablization of sand, with the increasing of vegetation cover, the ability of stabling the sand increase, thus decrease the transport rate. When the wind speed and transport rate decreased, the times of sandstorm and the sand in sandstorm will decrease, which in the end attain the goal of managing desert.After Dong Dong Tan million kilowatt solar power demonstration base has put into use, as solar power transform into electricity, the ground surface will receive less solar radiation, and the ground surface temperature will decrease either. The surface temperature decrease4.3℃, the local daily range and annual range, evaporation rate decrease, and air relative humidity, precipation increase. It is of positive affect in mitigating global warming and the crisis of long time drought in the desert gobbi.After the demonstration base is built, large area of solar panels cover the ground surface, which make the evaporation rate of surface moisture decrease, vegetation recovery rate increase. When carrying out labour greening measure, the vegetation cover in the demonstration base will increase. The increase of vegetation cover to some extend can help decreasing wind speed and transport rate, thus effectively prevents wind storms and fastens sands in the land, and reach the goal of controlling desertification.