Abstract:

Asymmetric structure of original inlet smoke boxes and irrational arrangement of  deflectors and orifice plates of an electrostatic precipitator (ESP) for 2×300MW units in a power plant were conducive to the flow field nonuniformity.Numerical simulation was made on inlet smoke box, which focused on the influence of its structure on airflow distribution. It is found that deflectors play a major role in balancing gas distribution between two smoker boxes and adjusting smoke flow direction, however, they have limited  improvement on airflow distribution uniformity.The orifice plates can effectively improve the uniformity of gas velocity distribution.There is regularity in the optimized layout of orifice plates which is the uniformity of airflow distribution can be improved with the decrease of orifice plate installation spaces and the increase of the percentage of open areas.With a better airflow distribution uniformity, the dustremoval efficiency can be raised. By analyzing field test results and the numerical simulation results, the accuracy and reliability of numerical simulation were confirmed.

Key words:

font-size: 10.5pt, mso-spacerun: 'yes', mso-font-kerning: 1.0000pt">ESP, inlet smoke box, airflow distribution, flow rate deviation, numerical simulation, optimization