The invention discloses a controllable heating-
heat regeneration device for preparing nano-
powder by a supercritical
hydrothermal synthesis technology. Cold and hot fluid inlet and outlet flow channels are formed in a shunt matrix; a cold fluid forward flow channel, a cold fluid reverse flow channel, a hot fluid forward flow channel and a hot fluid reverse flow channel are arranged in a heat
exchange matrix,
electric heating rods are arranged in a
central layer, a cold fluid connecting cavity, an upper annular cavity A, an upper annular cavity B and an upper annular cavity C are formed in theupper part of the heat
exchange matrix, a lower annular cavity A, a lower annular cavity B, a lower annular cavity C and a lower annular cavity D are formed in the lower part of the heat
exchange matrix, the hot fluid
inlet flow channel, the upper annular cavity A, the hot fluid forward flow channel, the lower annular cavity B, a heat communication flow channel, the lower annular cavity C, the hotfluid reverse flow channel, the upper annular cavity B and the hot fluid outlet flow channel form a hot fluid loop; and the cold fluid
inlet flow channel, the upper annular cavity C, the cold fluid forward flow channel, the lower annular cavity D, a cold communication flow channel, the lower annular cavity A, the cold fluid reverse flow channel, the cold fluid connecting cavity and the cold fluidoutlet flow channel form a cold fluid loop. According to the invention, the preheating temperature can be accurately controlled, the floor space is reduced, and heater microchannelizationI is achieved.