Selection and application of low carbon technologies in environmental impact assessment of cement Industry

The cement industry is one of the major energy-consuming industries and one of the major CO₂ emissions. It is very important to conduct carbon emission assessment and recommend appropriate low-carbon technologies in the environmental impact assessment (EIA) of the cement industry. The carbon production links of the cement production processes were analyzed, and the low-carbon technologies that appeared at home and abroad were sorted out. By establishing low-carbon technology evaluation index system in the cement industry, combined with actual investigation data, 15 low-carbon technologies of the cement representative enterprises in Hunan Province were evaluated, which provided a reference for the selection and application of carbon emission control technologies in the EIA of cement enterprises. The results showed that in terms of low carbon effect, the construction of energy management center, pure low-temperature waste heat power generation technology, high solid-gas ratio cement suspension pre-decomposition technology and the use of grinding aids had high scores, while in terms of technology maturity and technology universality, the scores of pure low-temperature waste heat power generation technology, roller mill grinding system, high voltage frequency conversion energy saving transformation and the use of grinding aids were high. From the perspective of economic evaluation index, the scores of pure low-temperature waste heat power generation technology, cement kiln cooperative disposal of municipal solid waste, high solid-gas ratio cement suspension pre-decomposition technology and the construction of energy management center were higher. The top technologies in the comprehensive ranking were mainly energy comprehensive utilization and energy-saving process control technologies, including pure low-temperature waste heat power generation technology, construction of energy management center, high solid-gas ratio cement suspension pre-decomposition technology, etc., which were the key recommended technologies in the environmental impact assessment.