Current Situation in the area of furnace gas treatment
Nitrogen and sulfur oxides in gas emissions of powerplants, metalworks, and similar productions cause serious environmental impact, such as acid rains, acidification of soils and open water bodies, smog generation, deforestation etc.
br>  Chemical methods have been developed and used abroad to remove nitrogen and sulfur oxides from flue gases. In Germany, nearly 100% of all powerplants are outfitted with chemical treatment plants. Such plants provide a high, about 90%, degree of cleaning. The long experience of their operation has revealed a number of noticeable drawbacks of chemical methods of treatment:
Such plants are very expensive (capital costs are 25-30% of the cost of a power generating unit)
Operating costs may be as high as 15% of a generating unit's capacity
The plant dimensions are comparable to the size of a power generating unit (or are even larger as in case of a coal powerplant), which complicates outfitting of existing production facilities with such treatment plants.
As a result of the plant's operation, wet solid waste is generated, which requires recycling. Moreover, the quantity of the waste produced nation-wide is such that its recycling is disadvantageous, so a sizeable part of it has to be buried.
The plants are slow switching between operating conditions.
Advantages of the Electron Beam Treatment Method
An alternative to the chemical method of flue gas treatment is the Electron Beam Treatment method enabling simultaneous removal of nitrogen and sulfur oxides. Separation levels of 90-98% are achievable.
The main advantages of the Electron Beam Treatment plants are:
Complete recycling of organic fuel. As a result of treatment, the plants produce dry fertilizers having an ample market demand.
The dimensions of an Electron Beam Treatment plant are several times smaller than those of a chemical treatment plant. This enables outfitting of existing facilities with such plants.
The plant can quickly switch over to another operating condition.
The capital cost of integrated, nitrogen and sulfur oxide removing Electron Beam Treatment plants built outside Russia is 25% lower than that of similar chemical plants, and the operating costs are also 25% lower.
According to the established opinion of power scientists, the Electron Beam Treatment of flue gases is the mainstream approach in the coal power industry. At present, Japan and the USA are expanding this technology to Bulgaria, China, and other countries.
EBT now offers a technology cutting the cost of Electron Beam Treatment.
The Electron Beam Treatment plant offered by us and intended to remove sulfur and nitrogen oxides and dust from flue is the most economical one by its capital and operating costs. It also allows to greatly reduce the environmental impact, since it turns harmful components of flue gases into useful products - unlike widely used chemical methods, the products of which cannot be recycled without additional expensive processing.
Treatment Process Description
Flue gases are mixed with ammonia and fed to the reactor.
Inside the reactor, the obtained mixture is exposed to electron beams. Radiolysis of molecules in the mixture generates active radicals, which acidify SOx and NOx to produce acids. The reaction of these acids and ammonia produces dry solid ammonia salts.
Immediately after the reaction, dust and ammonia salt particles produced as a result of treatment are collected and removed from the flue gas flow by the collection system.
The treated gas is discharged via the smokestack.
The ammonia salts are used as fertilizers or as raw material for the chemical industry.
The separation level monitoring and operating mode selection are based on data provided by a continuous gas composition monitoring system. The use of a computer allows to completely automate the operation of an Electron Beam Treatment plant.