Project ACORN – Feed Study for Carbon Capture Ducting

Cullum conducted ducting engineering support to a feed study for the first part of this project – the collection of flue gas from existing industrial emitters at St. Fergus. These are located on two sites, SEGAL and FUKA. On the SEGAL site there are two Gas Turbines with existing WHRU stacks. The intention is to route the flue gas from the existing WHRU to a new WHRU; from the new WHRU the routing will combine after new booster fans before terminating at a new Carbon Capture Plant (CCP) on the FUKA site. On the FUKA site there are two Hot Oil Furnaces and two Gycol Furnaces. The intention for both, is to route to new booster fans before combining with the SEGAL GT ducting at the inlet to the new CCP. 

Problem

GT Flue gas ducting had to route through ATEX Zone 2. This requires an outer temperature below 200 deg C despite carrying hot 500deg C GT flue gas. This requirement is so that there is not an ignition source for hazardous gases. In ATEX zone. 

Also, ducting distances for this project are large, and careful consideration is required to produce a cost-effective design whilst also meeting low pressure drop requirements. 

Solution

Cullum provided our expert engineering capability to produce a Feed study report that documented massflow & pressure drop calculations, P&ID review, costing , required specifications & codes, routing review, design concept and considerations for Installation and Maintenance. Cullum also provided a detailed specification for all ducting, dampers for this system 

Cullum ATEX ducting was specified for ATEX Zone 2. This twin wall construction has many years of running experience in hazardous areas, both at onshore and offshore facilities. 

Unique Challenges

Integration of GT ducting into existing vertical GT exhaust flue needed careful consideration to minimize pressure drop. 

ATEX ducting design