Control Of PH Value And Flow Rate Of Desulfurization Solution In Double Alkali Desulfurization Unit

Excessive SO₂ in the atmosphere can cause acid rain,which can cause great damage to crops,buildings and industrial facilities.In recent years,people have paid more and more attention to the atmospheric environment.The state has also introduced a number of policies to increase the punishment for illegal enterprises.The SO₂produced by the combustion of sulfur-containing coal in brick and tile factories is an important source of atmospheric SO₂.The brick and tile industry has low profit margin and the actual operation ability of personnel is poor.Therefore,it is very important to choose a suitable desulfurization device.The double-alkali flue gas desulfurization tower has many features such as small footprint,economical cost,high desulfurization rate,convenient operation and maintenance,etc.,so it is very suitable for the specific industrial environment of brick and tile factory.This paper introduces the operation process of the double alkali desulfurization process,the chemical reaction mechanism,and the influence of main process parameters on the desulfurization efficiency.Through analysis,it is found that the pH value of the desulfurization slurry of the clear liquid pool has a great influence on the desulfurization reaction,and its control process is time-delay,nonlinear,and it is difficult to obtain an accurate mathematical model.It is difficult to achieve good control effects against traditional control algorithms.In this paper,the fuzzy PID parameter adaptive algorithm is used to design the pH control system of the desulfurization liquid in the clear liquid pool.The parameters of the PID can be adaptively adjusted according to the fuzzy rules specified by the engineering experience to obtain better control results.In the double alkali desulfurization process,the slurry flow rate of the circulating pump of the clear liquid pool is adjusted,so that the slurry participating in the desulfurization reaction can sufficiently wash the SO₂ in the flue gas.The effective control of the circulating flow of the circulating pump is the key to improving the desulfurization efficiency of the desulfurization tower.There are many factors affecting the flow rate of desulfurization liquid and these factors are constantly changing.In this paper,the flow rate of the flue gas entering the tower,the temperature of the flue gas entering the tower,the concentration of SO₂ entering the flue gas,the pH value of the desulfurization liquid in the clear liquid pool,and the tower The concentration of flue gas SO₂ is input,and the flow rate of the desulfurization liquid in the clear liquid pool is output,and the relationship model between input and output is fitted through a neural network.By establishing the relationship between the desulfurization solution flow rate of the clear liquid pool and the above factors,the flow rate of the desulfurization liquid can be predicted by specifying performance indexes and real-time measured values.In summary,this paper solves the problem of controlling the pH value and flow rate of the desulfurization solution in the double-base desulfurization tower,which can ensure the maximum desulfurization performance of the desulfurization liquid and ensure the desulfurization efficiency of the desulfurization tower.Finally,the pH value and flow control system of the desulfurization solution was designed,and the hardware selection,system framework,and design of the host computer software system were completed.