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TCNA advances energy
efficiency and sustainability
Two legacy pulverised coal fired boilers at TCNA, the largest consuming unit that generate
most steam to run the facility and generate power, became inefficient. Further, the soot
blower cleaning devices in their Ljungström Air Heaters (LAH) were severely clogged with
fly ash, restricting the heat transfer and non-utilisation of waste heat which instead rose
up the stack. TCNA invested in replacing the LAHs of both these boilers to improve their
efficiency and operation. It resulted in the stack temperatures declining from 390 F to
o
325 F and hence 14,000 tonnes / year of lower coal usage translating into ~US$ 700,000
o
annual savings. Additionally, it enabled boilers to operate at full production and curbed
SO 2 emissions by 187 tonnes per year.
50 I INTEGRATED ANNUAL REPORT 2019-20
