A study on air-cooling waste heat recovery from molten slag of slag-tap boilers(PDF)

Release Time:2025-04-30  Hits:

• Date:2025-04-30
• Title of Paper:A study on air-cooling waste heat recovery from molten slag of slag-tap boilers(PDF)
• Journal:Journal of Power and Energy
• Summary:For a better utilization of Zhundong coals which have high fouling and slagging tendency, the slag-tap boiler has attracted
  much attention. To avoid the high sensible heat loss of discharged molten slag, an air-cooling waste heat recovery system
  is proposed. Energy and economic analyses are conducted to investigate the effectiveness of heating the desulfurized flue
  gas by hot air and the influences of partially substituting the secondary air by hot air on heat transfer of air preheater and
  thermal efficiency of boiler. A case study is performed by referring to a typical 50MW cyclone boiler with nine types of
  low fusion temperature coals. The results show that for coals with low ash content, the temperature increment of
  desulfurized flue gas can be over 7 ? C. While for coals with high ash content, the flue gas temperature can be heated to
  more than 70 ? C, and the surplus hot air can be sent to the furnace. When the hot air is introduced to partially substitute
  the secondary air, an instantaneous impact on the air preheater will give rise to a decrement of quantity of heat
  transferred and increments of temperatures of exit flue gas and hot secondary air. The variations of these thermo-
  dynamic parameters become smaller with increasing hot air temperature. After introduction of hot air, the thermal
  efficiency of boiler can increase, resulting in a decrease of fuel consumption rate. In addition, the heating surface area of
  air preheater can be reduced.
• Co-author:Lei Deng , Chunli Tang , Xiaowen Tan , Ke Sun , Song Wu and Defu Che
• Translation or Not:No
• Date of Publication:2017-03-14