Through Numerical Simulation

the causes leading to non-uniform distribution of fly ash at inlet of the electrostatic precipitator(EP) for ultra-supercritical 4×1000 MW untis in one power plant has been analysed

it is believed that the said situation is due to unreasonable structure of the EP's inlet.For this

retrofit measures have been put forward as follows:(1) two baffle plates have to be installed into distribution chamber of the flue duct;(2) the baffle plate between flue duct no.3 and flue duct no.2 in original structure of EP's inlets has to be retrofitted;(3) a guide plate for ash has to be installed below inlet of flue duct no.1.After retrofitting

the deviation of fly ash distribution decreases from 19% before retrofit to 7% after retrofit

the effectiveness of fly ash uniformization being remarkable.