Study on a New Drain Arrangement for Regenerative System

A new drain arrangement with water jet pump for regenerative system was put forward, and the working principle of water jet pump was introduced. The calculation model for jet coefficient of water jet pump, and the enthalpy of mixing of water jet pump outlet were determined, and the calculation model of economical indexes of unit based on the thermal balance method was built. Taking a 600MW supercritical steam power plant as an example, the jet coefficient of water jet pump was calculated, and the economy was compared under the different arrangement, the results shown that thermal economy of the drain arrangement with water jet pump was higher than that of flashed heaters.