High Quality Content by WIKIPEDIA articles! The economy of Tiruchirappalli is mainly industrial. The factories of Bharat Heavy Electricals Limited (BHEL), Heavy Alloy Penetrator Project and Golden Rock Railway Workshops are located in Tiruchirappalli. Due to the presence of boiler manufacturing units BHEL and Cethar Vessels, Tiruchirappalli is also known as the "Boiler capital of Tamil Nadu".