Introduction  In order to reduce the investment and operation cost of ash conveying system coal-fired power plant

  Method  This paper introduces an engineering example of a 2×350 MW circulating fluidized bed power plant project， in which the large ash hopper of electrostatic precipitator is used to replace the conventional ash silo of the power plant， and the fly ash is directly loaded from the ash hopper outlet of the Electrostatic precipitator and transported outside without the ash silo and pneumatic ash conveying device.

  Result  The investment of the two unite save 10.78 million yuan， and the power consumption of the air compressor save 2.12 million yuan per year. In addition， the consumables and maintenance work of the air compressor are reduced.

  Conclusion  Integration design scheme of Electrostatic precipitator and ash convey ing system in coal-fired power station may save the investment and operation cost.