Experimental Study On Trace Hg⁰ Removaland Synergetic Control Of SO₂ And NO By Formula Adsorbents

Hg⁰,SO₂ and NO emissions from coal-fired power plants have attracted worldwide attention.At present,the technology of active coke desulfurization and selective catalytic reduction?SCR?has been very mature,and the combined removal of pollutants is still backward.The development of an efficient,inexpensive and can be repeatedly used in the adsorbent,coal-fired power plant pollution control device for trace Hg⁰ flue gas has been,and SO₂ in flue gas and NO,has important practical significance and economic theory,the control of the pollutants.Therefore,the requirements for the combined removal of Hg⁰,SO₂ and NO,combining activated coke?V2O5-WO3/TiO₂?,SCR catalyst,silver zeolite was prepared with a new formula and formula of removal of Hg⁰,SO₂ and NO type adsorbent.First,this paper explores the adsorption effect of activated coke,SCR catalyst and silver zeolite to trace Hg⁰;secondly,the formulation was compared with different proportion of adsorption removal agent on Hg⁰;finally,in different temperature,O₂,HCl and other gas components,explore the impact of operating parameters on the prescription of adsorbent removal of trace Hg⁰ performance.The experimental results show that the 3:1?the ratio of activated coke and silver loaded zeolite?formula type adsorption removal agent on Hg⁰ best,pure N2 atmosphere,three kinds of single adsorbent and formula of adsorbent removal efficiency of trace Hg⁰ decreased with the increasing temperature;O₂ can effectively promote the Hg⁰ on the adsorbent the adsorption of HCl in the presence of O₂ removal of Hg⁰ under the conditions of a strong promotion.Secondly,the adsorption effect of SO₂,NO and SCR,which is composed of activated coke,silver catalyst,and the optimum ratio,was studied.The results showed that compared with active coke,SCR catalyst and silver loaded zeolite,the desulfurization and denitrification efficiency of the formula adsorbent was improved.By changing the entrance temperature,concentration and O₂ concentration,H2 O concentration,ammonia nitrogen condition parameters than that found formula type adsorbent desulfurization: at 120-180 ? temperature is higher,the desulfurization efficiency is low;the desulfurization efficiency will increase with oxygen concentration is nonlinear increases,when the concentration of O₂ exceeded 8%,the desulfurization efficiency increased slowly;with the increase of water vapor concentration,desulfurization efficiency first increased and then decreased,the water vapor concentration is 6%,the highest removal efficiency.Formula: denitration adsorbent bed temperature at 120²80 ?,the denitration efficiency increases with the temperature;the concentration changes of denitration efficiency with NO was not significant;oxygen concentration in the range of 0⁶%,the removal efficiency of NO increased with the increase of oxygen concentration;ammonia nitrogen ratio increases with increasing denitrification efficiency NH3,taking into account the two pollution,NH3/NO 1 is the most appropriate.Based on the formula of adsorbent for removal of Hg⁰,SO₂ alone and NO,this paper explores the effects of different concentrations of SO₂,NO and Hg⁰ on the formula of adsorbent removal from flue gas desulfurization and denitrification performance of trace Hg⁰ coordination,according to the interaction between SO₂ and NO Hg⁰,the role of the three,the way the removal of the two segment type.The results show that when there is SO₂,NH3 and SO₂ will be preferred,which will reduce the NO removal,but also inhibited the removal of Hg⁰;SO₂ and Hg⁰ on the removal of NO has a certain role in promoting;the existence of Hg⁰ has no effect on removal of SO₂ and NO when the three kinds of pollutants;existence,removal of formula type adsorbent has high.