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 50 MW 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 ℃. While for coals with high ash content, the flue gas temperature can be heated to more than 70 ℃, 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 thermodynamic 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.


    Zugriff

    Zugriff über TIB

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

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




    Erscheinungsdatum :

    2017




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch



    Klassifikation :

    BKL:    52.30 / 52.50 / 52.50 Energietechnik: Allgemeines / 52.30 Strömungskraftmaschinen, Turbomaschinen
    Lokalklassifikation TIB:    275/5345/5365/5500



    Molten Slag Would Boost Coal Conversion

    Ferrall, J. F. | NTRS | 1984


    Slow cooling slag yard arrangement system and slag ladle slow cooling control method

    ZHANG JISHENG / GENG HUILIANG / SHAO KE et al. | Europäisches Patentamt | 2023

    Freier Zugriff

    Steelmaking plant large molten iron slag lightering method

    LIU HUAXIANG / LI BAOPING / CHEN ZONGXIN | Europäisches Patentamt | 2016

    Freier Zugriff

    Intelligent hoisting system for high-temperature molten slag ladle

    XIAO XIAO / ZHANG MINGHUI / HU BING et al. | Europäisches Patentamt | 2022

    Freier Zugriff

    Steel slag magnetic separation processing recovery device

    LI MING / ZHANG LINTAO / QIAN SIYING | Europäisches Patentamt | 2023

    Freier Zugriff