Nitrogen oxide (NOx) in exhaust fumes from factories and power stations undergoes a photochemical reaction triggered by powerful ultraviolet rays in sunlight to produce toxic photochemical oxidants such as ozone, which are the primary cause of photochemical smog that is harmful to plants and humans alike. NOx also undergoes a chemical reaction in the atmosphere to form nitric acid, which oxidizes water in lakes, rivers and soil and causes acid rain that is harmful to plants and animals. Hitachi Zosen is helping to reduce atmospheric pollution with NOx removal catalysts and denitration systems that render NOx harmless via a decomposition reaction with ammonia.
NOx is present in combustion gases emitted by stationary facilities such as thermal power plants, iron mills and chemical plants. The denitration system separates NOx into harmless nitrogen and water via a reaction with ammonia, thereby reducing overall NOx emissions.
The denitration system consists of a NOx-removal catalyst, denitration reactor, ammonia injection system, ammonia dilution system, and ammonia storage and supply tanks. Hitachi Zosen provides NOx-removal catalysts and SCR systems to a variety of industrial fields including gas turbines, boilers (particularly coal-fired and heavy oil-fired boilers), diesel engines, refuse incinerators, ethylene cracking furnaces, petroleum reforming furnaces, and sintering furnaces.
Since we began developing NOx removal catalysts in 1969 and commercialized them in 1973, Hitachi Zosen has implemented many improvements. We began supplying the current product NOXNON700 in 1987 and offer this product to customers not only in Japan but also in the U.S., China, the Middle East, and many other places around the world.
- High specific surface area (up to 1,500 m2/m3)
- Lightweight and compact
- Low pressure loss
- Applicable for a wide range of reaction temperatures
- Applicable for a wide variety of fuels.