Phase-change-free heat-exchange integrated heating raw material coal water slurry gasification system and process

The invention discloses a coal water slurry gasification system. The coal water slurry gasification system comprises a gasification furnace, a washing tower, a settling tank, a grey water tank, a coalwater slurry/black water heat exchanger and a grey water/black water heat exchanger which are sequentially arranged and connected through pipelines and is characterized in that the black water inputend of the coal water slurry/black water heat exchanger is connected with the black water output ends of the gasification furnace and the washing tower; the black water input end of the grey water/black water heat exchanger is connected with the black water output end of the coal water slurry/black water heat exchanger; the black water output end of the grey water/black water heat exchanger is connected with the black water input end of the settling tank; the grey water input end of the grey water/black water heat exchanger is connected with the grey water output end of the grey water tank; the grey water output end of the grey water/black water heat exchanger is connected with the grey water input end of the washing tower. The coal water slurry gasification system has the advantages thathigh-temperature black water is subjected to two heat exchanger heat exchanges to heat coal water slurry and grey water, phase change is avoided, low-grade heat energy can be recycled, energy recycling efficiency is increased, a complex flash system is not needed, and equipment investment cost is lowered.