Optimization Of Coal-fired Power Considering Water Resources Constraints

After the 30·60 dual-carbon strategic goal was put forward,China’s energy transformation has been further accelerated.Through the development of traditional thermal power to make up for the power gap has been increasingly unable to meet the requirements of sustainable development of resources,environment and other aspects.However,limited by the current conditions such as power demand growth,technical economy and so on,coal-fired power still plays a leading role in China’s power supply within a short period of time.Considering the shortage of water resources in China,the huge water consumption in the process of coal power production has seriously hindered the development of the power industry.Based on this,the paper explores energy-water nexus in China and analyzes the water consumption of coal-fired power generation in China.In view of the problems existing in the construction of coal-fired power units,such as blind expansion and excessive water consumption,the paper constructs coal-fired power units planning model considering water resources constraints based on the traditional power planning model.Taking the coal-fired power units planning in Hebei Province as an example,the optimization scheme of coal-fired power units is obtained.Finally,the influence of water resources on coal-fired power units planning is explored through the comparison of schemes.First,the paper summarizes the theory of water resources carrying capacity,the energy-water nexus and the planning of coal-fired power units.Secondly,the paper calculates water consumption caused by coal-fired power generation of 30 provinces in China from 2005 to 2020.Through four different scenarios,the different results of water consumption caused by coal-fired power generation with different cooling technologies are compared.Then the paper analyzes the time evolution and spatial distribution of water use caused by coal-fired power generation,and also reveals the provincial spatial characteristics of water pressure in China caused by coal-fired power generation.Finally,the planning model of coal-fired power units considering water resources constraints is constructed.In the planning model,the relevant parameters and constraints of water are introduced to the general coal-fired power units planning model.With the goal of minimizing the total cost of the power generation system,the coal-fired power units are set as decision variables according to different installed capacity and different cooling technologies.The coal-fired power units planning of Hebei Province is taken as the model application.According to the relevant policy requirements,three scenarios of clean energy consumption proportion of power generation are set up to carry out example analysis.The results show that the development trend of clean energy in the future will affect the planning of the coal-fired power installed capacity.In the planning of coal-fired power units,the consideration of water resources will promote the development of air-cooling technology to gradually replace the traditional wet cooling technology.However,the application of air-cooling technology will increase the cost,coal consumption and carbon emissions with improving the water-saving efficiency of coal-fired power system.Based on the analysis of the current situation of water consumption caused by coal-fired power,the paper puts forward the corresponding suggestions through the comparison of two kinds of coal-fired power units planning under three scenarios of clean energy consumption proportion.In the future,with the increase of electricity demand,the scale of clean energy power generation will expand rapidly.Considering the limitation of local water resources reserves,the development of coal-fired power units planning should take both water consumption and carbon emission reduction targets into account.Under the premise of ensuring stable power supply,China needs to optimize the structure of coal-fired power units in an orderly manner,realize energy transformation step by step,and promote the realization of the power system goal of "green,economic,safe and efficient".