The desulfurization technology during coal combustion in furnace has been a competitive choice for middle and small industrial boilers to meet the environmental protection requirements,with the advantage of low cost a...The desulfurization technology during coal combustion in furnace has been a competitive choice for middle and small industrial boilers to meet the environmental protection requirements,with the advantage of low cost and convenient operation.The ordinary calcium-based sorbents such as limestone and calcium carbide residue have low desulfurization efficiency during coal combustion because of CaSO 4 decomposition.The sulphation product BaSO 4 which don’t decompose until 1580?℃ has much better thermal stability than CaSO 4 which rapidly decompose at about 1300?℃.A new type of barium-based sorbent with high desulfurization efficiency was developed.ZCS intelligent sulfur determination analyzer was used to study sulfur capture mechanism during the high temperature combustion process of coal.In addition the dynamic sulfur capture process of the mixture of barium-based sorbent and calcium-based sorbent was studied in detail.Industrial grate furnace experiment revealed that the desulfurization efficiency of barium-based sorbents could reach 35.5%, which is higher than 13.88% of calcium-based sorbent.It implied that the desulfurization effect of barium salt was much better than calcium salt during coal combustion at about 1200～1300?℃.展开更多
The microstructure of the raw,calcined,and desulfurized sa mp les of shell and limestone was detected and analyzed by SEM.Their ability of ca pturing SO2 was verified by using LCT-2 thermobalance and the high temperat...The microstructure of the raw,calcined,and desulfurized sa mp les of shell and limestone was detected and analyzed by SEM.Their ability of ca pturing SO2 was verified by using LCT-2 thermobalance and the high temperatur e tube reactor.The results showed that the better pore structure and smaller ga s diffusion resistance of shell were in favor of the inner reaction for SO2 ga s.Shell had higher calcium utilization ratio than that of limestone especially under the conditions of high reaction temperature and the increased reaction tim e.The bigger difference of the inner structure was found in the reaction of sul fation after calcination and direct sulfation.In direct sulfation, the reaction was restrained because of the bad pore connectivity, while the former reaction took place with good pore connectivity.展开更多
Desulphurizer is one of the key factors in the field of desulphurization technology In this paper, the influence of several additives on the desulphurization effect of calcium-based compounds and the mechanism were an...Desulphurizer is one of the key factors in the field of desulphurization technology In this paper, the influence of several additives on the desulphurization effect of calcium-based compounds and the mechanism were analyzed based on a lot of experiments Different kinds of sulfur-fixing agents based on CaCO 3 were prepared by inputing some single additive, some mixed additives and reformed by some chemical solutions The desulphurization rate of these agents was studied with ZCS-1 intelligent sulphur determination Some highly efficient agents and CaCO 3 were calcined, and their physical characteristic were studied with PoreMaster-60 mercury porosimeter Some reformed agents by some chemical solution after being added certain additives had better results at high temperature The sulfur-fixing efficiency of the best one could reach as high as 50% (Ca/S=1 5) at 1?100?℃ Its physical and sintered characteristic at high temperature were improved After reformed with aliphatic acid and being added some additives, the porosity of CaCO 3 increases from 15 57% to 34 93% while its surface area increases from 14 52?m 2/g to 19 94?m展开更多
文摘The desulfurization technology during coal combustion in furnace has been a competitive choice for middle and small industrial boilers to meet the environmental protection requirements,with the advantage of low cost and convenient operation.The ordinary calcium-based sorbents such as limestone and calcium carbide residue have low desulfurization efficiency during coal combustion because of CaSO 4 decomposition.The sulphation product BaSO 4 which don’t decompose until 1580?℃ has much better thermal stability than CaSO 4 which rapidly decompose at about 1300?℃.A new type of barium-based sorbent with high desulfurization efficiency was developed.ZCS intelligent sulfur determination analyzer was used to study sulfur capture mechanism during the high temperature combustion process of coal.In addition the dynamic sulfur capture process of the mixture of barium-based sorbent and calcium-based sorbent was studied in detail.Industrial grate furnace experiment revealed that the desulfurization efficiency of barium-based sorbents could reach 35.5%, which is higher than 13.88% of calcium-based sorbent.It implied that the desulfurization effect of barium salt was much better than calcium salt during coal combustion at about 1200～1300?℃.
文摘The microstructure of the raw,calcined,and desulfurized sa mp les of shell and limestone was detected and analyzed by SEM.Their ability of ca pturing SO2 was verified by using LCT-2 thermobalance and the high temperatur e tube reactor.The results showed that the better pore structure and smaller ga s diffusion resistance of shell were in favor of the inner reaction for SO2 ga s.Shell had higher calcium utilization ratio than that of limestone especially under the conditions of high reaction temperature and the increased reaction tim e.The bigger difference of the inner structure was found in the reaction of sul fation after calcination and direct sulfation.In direct sulfation, the reaction was restrained because of the bad pore connectivity, while the former reaction took place with good pore connectivity.
文摘Desulphurizer is one of the key factors in the field of desulphurization technology In this paper, the influence of several additives on the desulphurization effect of calcium-based compounds and the mechanism were analyzed based on a lot of experiments Different kinds of sulfur-fixing agents based on CaCO 3 were prepared by inputing some single additive, some mixed additives and reformed by some chemical solutions The desulphurization rate of these agents was studied with ZCS-1 intelligent sulphur determination Some highly efficient agents and CaCO 3 were calcined, and their physical characteristic were studied with PoreMaster-60 mercury porosimeter Some reformed agents by some chemical solution after being added certain additives had better results at high temperature The sulfur-fixing efficiency of the best one could reach as high as 50% (Ca/S=1 5) at 1?100?℃ Its physical and sintered characteristic at high temperature were improved After reformed with aliphatic acid and being added some additives, the porosity of CaCO 3 increases from 15 57% to 34 93% while its surface area increases from 14 52?m 2/g to 19 94?m
