Abstract
This chapter reviews air pollution and the control technologies for large two-stroke diesel engines, as well as for marine and stationary power plant use. The engines are all turbocharged and charge air cooled (intercooler) and usually directly coupled to either a propeller or a generator. This chapter outlines the present international and national regulations to support the scope for the past development. Particularly, the interest in nitrogen oxides (NOx) emission has been in focus, whereas particulate matter (PM), carbon monoxide (CO), or unburned hydrocarbons (HC) up till now have been of interest only to a few power plant applications. This may change in the future, however, when the NO emissions are generally under control and the concern for the environment becomes more acceptable for the marine industry. Because of the relative small market for these engines, compared to the automotive field, and the difficulty and expense of testing these engines, research and development are still lagging behind the automotive engines. On the other hand, fuel economy and reliability by far exceed the level for the automotive area. The chapter discusses technologies, such as NOx reduction techniques, engine adjustment methods, and selective catalytic reduction (SCR) to control pollution from these engines.
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