| This paper mainly to the actual situation of the work as the research object,in view of the company's existing YL-5000 B type flue gas system,combined with himself in the company of "continuous improvement" the smoke of the optimized renovation project,by using the methods of data monitoring and dynamic simulation of Aspen,concrete analysis of flue gas recovery system efficiency to reduce the reasons and solutions,and through the optimization of flue gas desulfurization process,to achieve the purpose of improving the efficiency of flue gas energy recovery and environmental protection.YL-5000 B flue gas system of our factory has been used for a long time.Compared with other large-scale flue gas supporting facilities,there are few improvements and optimizations for each type of catalyst,motor,rotary separator,etc.,which leads to many problems in scaling,erosion,and maintenance of seals and other aspects of this kind of small flue gas.During the inspection of the flue gas,it is found that when the flue gas has problems such as energy loss,power consumption increase,amplitude increase and poor tightness,it is mainly caused by the corrosion,erosion failure and seal aging of the flue gas blade.Sulfide is the biggest cause of corrosion loss of flue gas.During the overhaul of equipment,it was found that the bottom of flue gas power blade was completely corroded,which was very serious.By measuring the residual crystal particle concentration on the leaf with laser analyzer and offline measured data,it can be found that the sulfur element concentration of particles is relatively large.Finally,the method of ammonia desulfurization is selected.The main principle of ammonia process is: dilute liquid ammonia with water,the content of which is about 20%,and acid and alkali neutralization reaction will occur with SO2 in flue gas to produce(NH4)2SO3 and NH4HSO3,so as to achieve the purpose of reducing sulfur acid corrosion.Among them,this design adopts Aspen Plus software to simulate the desulfurization process.In order to achieve the optimal effect of operating parameters,the design is optimized mainly from the aspects of liquid-gas ratio,number of plates in the column,and temperature in the column.Considering with the increase of liquid gas ratio,the investment of the whole equipment will increase,so chose 11 mg/Nm3 / has the design of the SO2 concentration,exit flow when SO2 is 0.72 kg/h,can be concluded that this kind of situation in the curve of liquid gas ratio is about 0.25,corresponding to the absorption liquid temperature of 53.6 ?,using common plate column,with 2 pieces of plate.The diameter of the tower is 2.2m,the spacing of the plates is 0.6m,and the height of the overflow weir is set at 0.05 m.Absorption gas reaction on top of the main place for the period,this room for part of the packed tower,and packing for orifice plate corrugated packing: packing for type 250 stainless steel sheet metal of x,specific surface area of 240 m2 / m3,the porosity of 95%,the density of 210 kg/m3,has good absorption effect,the smaller liquid gas ratio can significantly reduce the operating costs of equipment,the best gas liquid ratio requirement environment,and improve the design of practical operability.Compared with the previous spray model of ammonia desulfurization empty tower,this design adopts a new method that adds the corrugated packing of orifice plate.This paper has certain guiding significance for improving the recovery efficiency and environmental protection of flue gas in petroleum refining. |
PDF Full Text Request