The　existing　intermittent　kilns　are　generally　lack　of　a　complete　waste　heat　recovery　system　and　the　waste　heat　of　high-temperature　flue　gas　generated　during　the　firing　process　cannot　meet　the　heating　demand　of　the　whole-time　production　process,　due　to　the　intermittent　production　method.　Therefore,　a　molten　salt　thermal　storage　technology　was　proposed　in　this　study,　aiming　to　achieve　the　recovery,　storage　and　cross-time　reuse　of　the　high-temperature　flue　gas　from　intermittent　kilns.　Correspondingly,　a　mathematical　physical　model　coupling　multi　physical　fields　was　established　for　the　molten　salt　regeneration　process.　The　attention　was　focused　on　the　molten　salt　thermal　storage　characteristics　of　high-temperature　flue　gas,　as　well　as　the　influences　of　flue　gas　heat　exchange　tube　layout,　flue　gas　flow　rate　and　temperature　on　thermal　storage　rate　of　the　molten　salt.　It　is　found　that　the　thermal　storage　efficiency　is　maximized　when　the　heat　exchanger　tube　is　of　longitudinal　layout　and　the　flow　direction　of　flue　gas　is　from　bottom　to　top,　followed　by　the　flow　direction　from　top　to　bottom.　In　comparison,　the　horizontal　layout　is　the　worst.　Thermal　storage　efficiency　of　the　molten　salt　increases　significantly　with　increasing　flue　gas　flow　rate　and　temperature.　Thermal　storage　rate　decreases　at　a　higher　speed,　while　it　tends　to　be　relatively　stable　as　temperature　increases.　The　thermal　storage　rates　increase　by　32.11%　and　64.77%　respectively　within　the　given　change　ranges　of　the　flue　gas　flow　speed　and　temperature.　©　2023　Journal　of　Ceramics.　All　rights　reserved.