550 / 2019-01-16 21:24:08

Key Technologies for 630℃ Ultra-Supercritical Double-Reheat Boilers

630℃ ultra-supercritical double reheat boiler, selection of material, deviation control

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The 630℃ ultra-supercritical double reheat boiler design was based on further optimization of existing boiler designs to enable the use of current mature materials by fully exploiting their potentials. This paper presents in-depth discussions on the key problems resolved during the design phase, especially on the selection of materials for heating surfaces under higher temperatures. In addition, manufacturing process experiments were conducted on some materials. Detailed analyses were carried out on methods of controlling steam temperature deviations caused by flue gas side and steam side unbalances including thermal hydraulic deviations. Effective solutions to these main technical difficulties were put forward. When compared with previous 620℃ boiler units, the 630℃ unit is more economically advantageous.