According to the experimental and operation data of a 300 MW unit before its capacity increase retrofitting

the main auxiliaries' performances were checked to determine their adaptability on the transformation.Results indicate that

the air volume of forced draft fan doesn't satisfy the requirement while that of the induced draft fan does.The air preheater's heat exchange performance under the flue gas and air condition of retrofitted unit meets the adjustment requirement.Both the feed water pump and condensate pump satisfy the requirements while the circulating water pump needs reform.Neither the heat exchange area of No.1 nor No.3 high pressure heater meets the requirement after retrofitting

while that of No.2 high pressure heater does

but its excess area fails to reach 10% of the value that general design requires.The condenser meets the requirement when increasing the flow rate of cooling water to 39 000 m3/h.