Oishi G.,Mitsui Ship Bldg Engineering Co Ltd |
Shimada K.,Mitsui Ship Bldg Engineering Co Ltd |
Yoshino I.,Mitsui Ship Bldg Engineering Co Ltd |
Nakata T.,Mitsui Ship Bldg Engineering Co Ltd |
Yuasa S.,Mitsui Ship Bldg Engineering Co Ltd
Petroleum Abstracts | Year: 2015
Mitsui Engineering and Shipbuilding Co Ltd has developed a natural gas hydrate pellet carrier. Rapid regasification of the pellets within the ship shall be required in an emergency, e.g., breakdown of unloading devices to repair the devices under air circumstances after dissociating the pellets and excluding methane gas in cargo holds. A computer code, based on simplified Navier-Stokes equation and heat transfer relation including phase changes among solid, liquid and gas, are developed to simulate re-gasification and dissolution process of NGH pellets due to water injection into cargo hold. Freeze-up of injection water, which might occur because of massive cold pellets, is a major concern in re-gasification operation. Two ways of water injection were studied with simplified cargo hold models and methane gas pellets: one is vertical injection with spray from the hold top and the other is sideward injection from the hold wall. Nat gas transpo.