System and method for refrigeration by using waste heat of steam condensate

The invention relates to a system for refrigeration by using waste heat of steam condensate. The system comprises a generator, heated ammonia gas in the generator enters an evaporative condenser via an ammonia gas pipeline, the ammonia gas is condensed into liquid ammonia through the evaporative condenser and enters a liquid ammonia storage groove via a liquid ammonia pipeline, the liquid ammoniain the liquid ammonia storage groove enters an external cooler via the pipeline, the liquid ammonia absorbs heat via the external cooler to become low-pressure ammonia gas to enter an ammonia absorber, an ammonia-poor solution in the ammonia absorber changes into an ammonia-rich solution after absorbing the low-pressure ammonia gas, the ammonia-rich solution is pumped into an exchanger through a liquid-rich pressure pump, which absorbs heat and enters the generator, and the ammonia-poor solution in the generator is cooled by the exchanger and then enters into the ammonia absorber. The system has the advantages that lo