Evaluation Of Energy Saving And Emission Reduction Potential Of Energy Cascade Utilization And Its Impact On Atmospheric Environment In Yongcheng Economic-Development Zone

As the growth pole of the national economy,the industrial parks account for more than 60%of the China's total industrial output,and is also an important support for energy conservation and emission reduction.Industrial parks have improved in terms of economic development and pollution control in recent years.However,improving energy efficiency and controlling pollutant emissions are still urgent problems to be solved in the development of industrial parks.Energy cascade utilization including mass-use energy and multiple-stage energy use,can significantly improve energy efficiency and achieve the best overall benefits,but most industrial parks are currently unaware of the importance of energy cascade utilization.Therefore,the research on the energy saving and emission reduction potential of industrial park energy cascade utilization is of great significance to the energy efficiency improvement and transformation and upgrading of the park.This paper analyzes the energy utilization and air pollutant emission in the Yongcheng Economic Development Zone of Henan Province,summarizes the energy cascade utilization mode of the main heat source enterprises in the park,and sets the current situation and enhanced scenarios of energy cascade utilization.The energy saving potential of the case park through the application of energy cascade utilization measures and the synergistic emission reduction potential of SO₂,NO_x,PM₁₀ and PM_2.5 are calculated.Then,the CALPUFF model is used to simulate the impact of the energy cascade utilization of the park on the atmospheric environment quality of the surrounding area.Finally,the energy-saving effect of cascade utilization of energy in YEDZ and the synergistic emission reduction effect of four atmospheric pollutants are summarized,and the shortcomings encountered in the process of this study are prospected.The research results show that:?1?The types of energy cascade utilization in Yongcheng Economic Development Zone include:cascade utilization of steam in different pressure grades in the park,blast furnace gas and converter gas in iron and steel plants,high-temperature flue gas recycling in electrolytic cell of electrolytic aluminum plant,and high-temperature aluminum liquid in electrolytic aluminum plant.?2?The energy cascade utilization measures in YEDZ have brought about obvious environmental benefits.The total energy saving potential of the 14 chains in the current situation is 2752 TJ,and the emission reduction of atmospheric pollutants is 255.3 tons of NO_x,379.5 tons of SO₂,3.1 tons of PM₁₀ and 22.5 tons of PM_2.5.In the energy cascade utilization enhancement scenario,the total energy saving potential is 7770 TJ,the SO₂ and NO_x emission reduction potential is 859 tons and 910 tons,and the PM₁₀ and PM_2.5.5 emission reduction potentials are 72.7 tons and 37.9 tons.?3?The results of the CALPUFF model verify that energy cascade utilization measures have a positive effect on improving urban air quality.In the energy cascade utilization enhancement scenario,the emission rates of the four air pollutants were significantly reduced,with SO₂ decreasing by 8.48%,NO_x decreasing by 9.18%,PM₁₀ decreasing by 5.13%,and PM_2.5 decreasing by 5.02%.?4?This paper provides a new idea for the future study of air pollutant emissions in industrial parks and corresponding urban atmospheric environmental impact assessment.In addition,the industrial park should meet the energy conservation and emission reduction targets by strengthening the utilization of waste heat and residual gas,and accelerate the construction of the park's steam pipe network and energy control center.