Abstract: Based on a 600 MW supercritical pure condensing unit, the optimization design of industrial steam extraction is completed. Through the contrast analysis, at variable load conditions, the cold reheat steam extraction combined with temperature and pressure reducer is the optimal solution. Combining the economic analysis of engineering transformation, the annual coal consumption can be decreased by 1.86 g/k Wh under 50% THA operating condition.Meanwhile, the annual income is up to 35.025 million yuan by 2021, investment recovery period is far less than a year. The project has significant economic and social benefits.

Key words: industrial heating, reheat cold section, desuperheating and decompression, technical economy