The incident occurred at about 4 am while the labourers were working at the CCP unit of the plant, police said.
While two workers died on the spot, seven injured were admitted to two hospitals.
The condition of three of the four injured, being treated at a private hospital in Durgapur, is critical as they suffered 90 per cent burn injuries, a hospital official said.
Other injured were admitted to the IISCO hospital at Burnpur.
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