Experimental Research On Multi-pollutants Control By Ozone Oxidation Combining Ammonia Absorption

As the fast development of mankind economy, the demand of energy supply expended. A large amount of carbon dioxide emitted to atmosphere from combustion of fossil fuels causes severe greenhouse effort. As CO₂ is the most important greenhouse gas,reducing its emission becomes an attentive problem in the whole world. Therefore, it is very important to develop CO₂ reducing technology of coal-fired power plants suiting to our national condition for our country as a country of high greenhouse gas emissing. Increasing decarbonization equipments based on desulphurization and denitrification will inevitably increase large investments and operating costs, therefore it is especially important to research multi-pollutants integration removing technology. This paper introduced the research developments of extant independent desulphurization and denitrification technologies in the coal-fired power plants and the present application CO₂ controlling technology, it also analyzed the processes and mechanisms of ammonia desulphurization, ozone combine ammonia denitrification, decarbonization by ethanolamine and ammonia as well as the mechanism of NHD suppressing ammonia escaping. Through experimental study, various factors like absorption solution concentration, gas density, inlet gas current capacity, pH value and temperature etc. impacting efficiencies of ammonia desulphurization, ozone combine ammonia denitrification and decarbonization by MEA and ammonia. The results of decarbonization by MEA and ammonia are compared, and through experimental study the action of NHD inhibitting ammonia escaping has been researched. The experiments proved that ammonia decarbonization has superiorities of low cost, large absorption capacity and so on than MEA and NHD can suppress ammonia escaping effectively. In the experiments of multi-pollutants integration removing, under the optimum conditions, SO₂ removal efficiency can achieve 92.78%, CO₂ removal efficiency can achieve 90.68% and NO_x removal efficiency can achieve about 84.33%. The paper also analyzed the recycling and application prospects of reaction by-products, introduced the functions in agricultural production and economic value of ammonium sulfate, ammonium nitrate and ammonium bicarbonate three kinds of by-products, and analyzed their market prospects. It can reduce the economic cost effectively and decrease environmental pollution to recycle by-products, and it has great significance to social sustainable development. The paper can provide references for the development of coal-fired flue integration purification technology and large-scale industrial application in future.