Supercritical water oxidation system and start and stop control method thereof

The invention provides a supercritical water oxidation system and a start and stop control method thereof, and belongs to the technical field of resources and environments. The system comprises a material storage tank, a process water storage tank, a tubular heat exchanger, a tubular reactor, a cooler, a high-pressure gas-liquid separator and a heater, wherein the material storage tank, the innersleeve of the tubular heat exchanger, the inner sleeve of the tubular reactor, the cooler, and the high-pressure gas-liquid separator are sequentially connected according to the flow direction of a material, and the process water storage tank, the heater, the outer tube shell of the tubular heat exchanger, and the outer tube shell of the tubular reactor are cyclically connected according to the flow direction of process water; the process water storage tank is also connected with the inner sleeve of the tubular heat exchanger, and the inner sleeve of the tubular reactor is also connected withexternal oxygen supply, an