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A case study of greenhouse gas inventory and mitigation measures in the cement industry of Taiwan

ABSTRACT The cement industry is the most energy intensive of Taiwan's manufacturing industries. This paper presents a case study of the greenhouse gas (GHG) inventory in Taiwan's cement industry, which includes an analysis of GHG emission intensity (EI) and the testing of raw meal calcination. The GHG inventory analysis results show that direct GHG emissions (Scope 1) are the largest emission source of the study subject, the H plant. As regards the EI analysis results of Taiwan's cement plants, only one cement plant (H plant) meets the EI limit announced by the Environmental Protection Administration (EPA) of Taiwan. According to the calcination test, the major calcination reaction occurs in the 700–900°C temperature range and accounts for nearly 87% of total CO2 emissions. Finally, a modified and feasible process is proposed as a base case for simulating options for GHG reductions in the cement industry. The modified process can reduce coal consumption and pipeline corrosion, and increase the efficiency of waste heat recovery and the calcination rate; these procedures require low investment and operating cost.