Development and practice of energy-saving retrofit technologies for coal power units under carbon peaking and carbon neutrality goals
Under the background of carbon peaking and carbon neutrality,energy saving and carbon reduction in the coal power industry is an urgent problem to be solved.This paper summarises and analyses various energy-saving retrofit technologies for coal power units through retrofit cases,focusing on the impact of boiler and turbine optimisation on the overall energy-saving upgrading of power plants.Existing coal power energy-saving retrofit technologies include unit parameter upgrading retrofit technologies and equipment upgrading retrofit technologies.The key lies in the reasonable optimisation of turbines,boilers and their auxiliary systems.The parameter upgrading retrofit technology has a certain energy-saving effect,and the cross-generation retrofit can save power generation standard coal consumption of 3.5-8.5 g/(kW·h).The energy-saving effect of turbine efficiency retrofit technology is better,and the saving of standard coal consumption for power generation by through-flow retrofit is generally 6.0-10.0 g/(kW·h),which is highly feasible.The cost of boiler heating surface retrofit and piping retrofit is higher than that of through-flow retrofit,and the energy saving is about 3.5-4.5 g/(kW·h).Boiler using advanced waste heat recovery technology about 0.4 g/(kW·h)energy savings;the application of advanced pulverising system can significantly improve the efficiency of the pulverised coal separator so that the boiler efficiency by 0.2%-1%.In the future,the coal power industry needs to focus on the coupling application between energy-saving technologies and other technologies such as low-carbon and the construction of energy-saving and carbon reduction evaluation system.The formation of optimizable and evaluable energy-saving and low-carbon technology integration solutions for the characteristics of the units will support the green and low-carbon transformation of the coal power industry.
Coal power unitsenergy efficiency retrofitsraise parameterboilerturbine
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