CO_2 Recovery Unit for Surplus Urea Production

摘要

Mitsubishi Heavy Industries, Ltd. (MHI) and Kansai Electric Power Co. (KEPCO), the second largest utility company in Japan, initiated collaboration in 1990 in response to concerns relating to global warming. This industrial alliance has led to the development of proprietary technology aimed at reducing atmospheric emissions of carbon dioxide (CO_2) from the combustion of fossil fuels, through a combination of specific expertise and capital. MHI and KEPCO have developed, and continue to develop, highly advanced post-combustion capture (PCC) solvents, processes and special equipment to further refine and enhance certain process features and to reduce the energy penalty associated with CO_2 capture. MHI is a world leader in the field of PCC technology which stems from almost 20 years of research, development and demonstration (RD&D). In addition, MHI also has also been awarded an increasing number of commercial CO_2 capture plants and we currently have in excess of 20 years of cumulative commercial operating experience. MHI currently has ten commercially operating PCC plants in the chemical and fertiliser industry, up to 450 metric tons per day (t/d). This experience includes CO_2 capture from a natural gas and heavy oil fired boiler and natural gas steam reformers. MHI has also recently been awarded an additional commercial project, currently under construction and expected on stream in 2015. By the application of this technology, it is possible to match the ammonia production for the full conversion to the urea production recovering carbon dioxide from the flue gas independent of the natural gas source and even more with hydrogen recovery unit. Production flexibility is enhanced when the CO_2 recovery is carried out from the auxiliary boiler flue gas utilizing ammonia from the storage.