Summary of Steam System Optimization and Energy Saving and Carbon Reduction Practice in Yanshan Petrochemical Company

This paper analyzes the main problems of Sinopec Beijing Yanshan Petrochemical Co., Ltd., such as decentralized steam system layout, many types of fuels, obvious increase in fuel cost, low operation efficiency of turbine and boiler and high self consumption loss, and puts forward and implements optimization and improvement measures such as pressure raising transformation of natural gas system, adjustment of energy consumption structure, reduction of energy consumption cost, improvement of steam production quality and equipment efficiency. The results showed that compared with the fuel consumption in 2018, the consumption of coal coke was reduced by 550 000 t, the consumption of natural gas was increased by 170 000 t, and the total consumption of fuel gas and fuel oil was increased by 50 000 t, equivalent to 246 000 t of standard coal; the purchased electricity was increased by about 5×108 kW•h. Green power trading and 14.76 MW distributed photovoltaic projects were carried out. According to the calculation of 1 400-1 600 h annual power generation in class II photovoltaic areas and the emission factor of North China regional power grid baseline, the annual emission reduction was about 55 000 t carbon dioxide in 2021. After the above transformation, the goal of zero-coking is achieved; the steam consumption of units is reduced by 21.5%, the steam production of boilers is reduced by 24.9%, and the annual emission reduction is about 760 000 t carbon dioxide, which has achieved good results.