recently issued the Notice on the Principles for the Examination and Approval of Environmental Impact Assessment Documents for Construction Projects in the Four Industries of Integrated Circuit Manufacturing, Lithium Ion Battery and Related Battery Materials Manufacturing, Electrolytic Aluminum and Cement Manufacturing (hereinafter referred to as the Principles for Examination and Approval), in order to have a thorough understanding of the compilation background of the Principles for Examination and Approval. The reporter interviewed the responsible person of the Department of Environmental Impact Assessment and Emission Management of the Ministry of Ecology and Environment to interpret the Principles of Examination and Approval in detail.
Ask: What are the characteristics of the Examination and Approval Principles for the cement manufacturing industry?
Answer: The first is to encourage the construction, reconstruction and expansion of cement clinker manufacturing projects and cement grinding station projects to reach the ultra-low emission level of the industry. In terms of organized emission control, cement kilns are equipped with low-nitrogen burners, low-nitrogen combustion technologies such as staged combustion and fine control of oxygen content in other decomposition furnaces are adopted, and combined denitrification technologies such as selective non-catalytic reduction (SNCR) and selective catalytic reduction (SCR) are adopted to control ammonia escape; Cement kiln and kiln tail waste heat utilization system (kiln tail) and cooler (kiln head) shall be equipped with advanced and efficient dedusting facilities simultaneously; when sulfur dioxide in flue gas cannot be discharged stably up to standard due to high sulfur content in raw materials and fuels, desulfurization facilities shall be provided. In terms of unorganized emission control, the storage and transportation of dust-producing materials should be sealed or closed. In terms of clean transportation, limestone and other raw materials are preferentially transported into the plant by railway, waterway, tubular belt conveyor, belt corridor and other clean methods, and new energy vehicles are used for in-plant transportation.
The second is to put forward targeted requirements for the co-disposal of solid waste projects. Provide clear requirements for the category, scale, dosing location and dosing facilities of solid wastes entering the kiln; require that high-efficiency bag (or electric bag composite) dust removal facilities shall be used for dust removal at the kiln inlet; for the storage facilities for waste gas treatment by introducing into the high temperature area of the cement kiln, it is required to configure other gas purification devices at the same time for use during the shutdown of the cement kiln.
The third is to encourage projects to reduce greenhouse gas emissions from raw material substitution, fuel substitution, energy efficiency improvement, carbon capture and storage, etc. In terms of raw material substitution, the proportion of calcium resources such as carbide slag, phosphogypsum, fluorogypsum, manganese slag, red mud and steel slag instead of limestone is increased; the proportion of industrial wastes such as slag and fly ash is increased and the clinker coefficient is reduced. In terms of fuel substitution, we encourage the use of alternative energy sources such as biomass fuels and refuse derived fuels. In terms of energy efficiency improvement, energy-saving and low-carbon technologies such as cement kiln high-efficiency pre-decomposition system, low-resistance cyclone preheater, high-efficiency firing, high-efficiency grate cooler and high-efficiency energy-saving grinding are adopted. In terms of carbon capture and storage, pilot demonstrations such as the integration of carbon capture, utilization and storage are encouraged.
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