Carbon Footprint Calculation And Carbon Emission Analysis Of Phosphorus Chemical Industry

Since the industrial revolution,human activities such as fossil energy consumption and deforestation have been widely recognized as the main factors driving climate change.In recent years,excessive CO₂ and other greenhouse gas emissions have caused a global climate crisis,and the reduction of CO₂ and other greenhouse gas emissions has gradually become the focus of attention.In 2020,China officially proposed to achieve"carbon peak"by 2030 and"carbon neutrality"by 2060,demonstrating its determination to tackle global warming.With the government’s emphasis on the tasks of carbon peak and carbon neutrality,carbon emissions have gradually become one of the indicators to measure whether products,enterprises,and parks belong to green development,and the accounting and analysis of carbon footprint is the theoretical basis and prerequisite for formulating carbon reduction measures.As a traditional pillar industry of China’s national economy,the phosphorus chemical industry has become an important force driving China’s economic growth.However,it also consumes many resources and energy,leading to a continuous increase in greenhouse gas emissions such as CO₂.Therefore,it has become more and more important to study the carbon footprint accounting of phosphorus chemical products,phosphorus chemical enterprises,and phosphorus chemical industrial parks.It is of great research significance and value to account for and analyze the carbon footprint of the production process of typical phosphorus chemical products and phosphorus chemical enterprises and to establish a carbon footprint accounting method suitable for phosphorus chemical industrial parks to achieve energy conservation and emission reduction in the phosphorus chemical industry.The main research work of this paper is as follows.（1）The carbon footprint of a typical thermal phosphoric acid process product,yellow phosphorus,is taken as the research object.The carbon footprint of a yellow phosphorus product is determined according to the relevant standards and norms for product carbon footprint accounting and the actual production situation of the enterprise.A carbon footprint accounting model for the yellow phosphorus product is established to account for the carbon footprint of 1 t of yellow phosphorus product in an enterprise.The calculation results show that the carbon footprint of 1 t of yellow phosphorus produced by the case enterprise is 1.580×10⁴ kg CO₂ t^-1,and its carbon emissions are mainly concentrated in tail gas treatment and power consumption,which account for 90.08%of the total.Based on the analysis of the specific accounting results of the carbon footprint of yellow phosphorus products,emission reduction measures such as adopting green electricity production,rational use of the geographical location advantage of phosphate resources,strengthening process control,and comprehensive utilization of yellow phosphorus tail gas are proposed as a way to reduce the carbon footprint of the production process of yellow phosphorus products.（2）Taking a typical wet process phosphoric acid production process as the main phosphorus chemical enterprise as the research object,the carbon emission accounting scope of the phosphorus chemical enterprise was determined based on the standard specification of enterprise carbon footprint accounting and combined with the actual operation and production situation of the enterprise,and a carbon footprint accounting model of the phosphorus chemical enterprise was established to account for the total carbon footprint of the enterprise in 2021.The accounting results show that the carbon footprint of the case enterprise in 2021 is 654442.09 t CO₂,and from different carbon emission sources,the carbon footprint of fossil energy consumption is 414483.49 t CO₂,accounting for 63.33%;the carbon footprint of process emission is239852.26 t CO₂,accounting for 36.65%,and the carbon footprint of electricity consumption is 102.66 t CO₂,accounting for 0.02%.8813.45 t CO₂,accounting for1.35%;compound fertilizer plant carbon footprint is 2686.57 t CO₂,accounting for0.41%;solid bacterial plant carbon footprint is 1142.26 t CO₂,accounting for 0.17%;ore dressing plant carbon footprint is 539.99 t CO₂,accounting for 0.08%;wet phosphoric acid plant carbon footprint is 372.49 t CO₂,accounting for 0.06%;carbon footprint of high tower plant is 177.24 t CO₂,accounting for 0.03%;carbon footprint of ammonium phosphate plant is 168.97 t CO₂,accounting for 0.01%;carbon footprint of ammonium phosphate II plant is 52.68 t CO₂,accounting for 0.01%;carbon footprint of sulfur acid plant is 31.15 t CO₂,accounting for 0.01%.Based on the carbon footprint accounting results of phosphorus chemical enterprises,emission reduction measures applicable to the production of phosphorus chemical enterprises such as optimization of energy use structure,upgrading and optimization of production facilities and equipment,green development of production processes,and promotion of CCUS technology are proposed from the enterprise level.（3）Combining the carbon footprint accounting methods and cases of phosphorus chemical products and phosphorus chemical enterprises,considering carbon sink activities in industrial parks,and combining the carbon footprint accounting methods of different land types,a carbon footprint accounting method based on industry types of phosphorus chemical industrial parks is established.In the carbon source and carbon sink land,the carbon emission activities of phosphorus chemical industrial park are divided into five categories:energy activities,industrial production,agricultural activities,waste treatment and carbon sink activities,and the specific carbon emission activities and accounting methods are defined.