Overhead tank heat exchange system and modified pitch production system

The invention discloses an overhead tank heat exchange system and a modified pitch production system and relates to the technical field of pitch production. The overhead tank heat exchange system comprises pitch overhead tanks, heat conduction devices arranged in the pitch overhead tanks, a heat exchanger, and a first pipeline through which the inlet of a first fluid channel communicates with the heat conduction device, wherein the heat conduction devices are configured to collect steam or/and steam condensate of a tar recovery section; the heat exchanger is provided with the first fluid channel and a second fluid channel and used for heat exchange between fluids in the first fluid channel and the second fluid channel; and the first fluid channel, as well as the second fluid channel, is provided with the inlet and an outlet. The problems that due to a poor heat exchange effect of pitch in a conventional pitch overhead tank, modified pitch products are poor in molding, the pitch discharge temperature is high,