Numaligarh Refinery Ltd. (NRL) has let a contract to Thyssenkrupp AG’s plant engineering division to provide a series of services for the long-planned expansion of its 3 million-tonnes/year Numaligarh refinery in the Brahmaputra valley of Assam’s Golaghat district, in far-northeastern India (OGJ Online, Jan. 16, 2019; Aug. 13, 2014).
As part of the 3 billion-rupee contract, Thyssenkrupp Industrial Solutions AG will deliver engineering, procurement, and construction management (EPCM) services for various units to be built as part of the expansion, including a new 2 million-tpy petrochemical fluidized catalytic cracking (PFCC) unit, LPG treatment and gasoline desulfurization units, as well as motor spirit (MS) blocks equipped with naphtha hydrotreating, continuous catalytic reforming (CCR), and isomerization units, Thyssenkrupp said on May 6.
Part of the government of India’s Hydrocarbon Vision 2030 initiative to help meet growing demand of petroleum products in northeastern India, NRL’s refinery expansion—which will increase overall crude oil processing capacity at Numaligarh by 6 million tpy to 9 million tpy—is scheduled to be completed by 2024, the service provider said.
Officially approved by India’s Cabinet Committee on Economic Affairs in January 2019, the originally planned 225.94 billion-rupee Numaligarh expansion—which also will include construction of a 180,750-b/d, 1,398-km crude pipeline from Paradip to Numaligarh, as well as a 120,500-b/d, 654-km products pipeline from Numaligarh to Siliguri—subsequently required an additional investment of 41.65 billion rupees to complete for a revised overall project cost of 267.59 billion rupees, according to the latest update on NRL’s website.
Project processing overview
According to a February 2020 environmental impact assessment for the refinery’s expansion completed by Engineers India Ltd. (EIL), the project—which will involve construction of a new refining unit at the site designed to process imported sour crudes—will add the following major units and capacities at Numaligarh:
- Combined crude-vacuum distillation unit (with naphtha stabilizer); 6 million tpy.
- Naphtha hydrotreating unit; 1.2 million tpy.
- CCR unit; 750,000 tpy.
- Naphtha isomerization unit; 500,000 tpy.
- PFCC unit; 1.95 million tpy.
- FCC gasoline hydrotreating (desulfurization) unit; 580,000 tpy.
- Diesel hydrotreating unit; 3.55 million tpy.
- Hydrogen generation unit; 95,000 tpy.
- Residue upgrading unit (ebulated bed, with vacuum gas oil hydrotreater); 2 million tpy.
- LPG treating unit; unavailable.
- Fuel gas treating unit; unavailable.
- Sour-water stripping unit; unavailable.
- Amine regeneration unit; unavailable.
- Sulfur recovery unit, tail-gas treatment unit; 230,000 tpy each.
The project additionally will involve a revamp of the refinery’s existing 300,000-tpy delayed coking unit to increase its processing capacity to 570,000 tpy, according to EIL.