South Korean conglomerate Doosan Corp. said Monday it agreed to buy shuttered South Windsor fuel cell manufacturer ClearEdge Power for $32.4 million. ClearEdge abruptly closed down in late April, laying off 300 workers without warning, and filed for Chapter 11 bankruptcy on May 1. The company launched an auction on July 9 to sell off its assets, in order to repay some of the company’s creditors.