Liquid ammonia, sodium nitrate and lithium bromide diffusion refrigeration system

A refrigeration system, comprising:

• a generator having a liquid storage cavity for containing a liquid ammonia and sodium nitrate solution, wherein a heat source is connected to the generator, and an exhaust pipe is arranged at the upper end of the generator;
• a condenser having a condensation cavity, wherein an inlet of the condensation cavity is communicated with the exhaust pipe;
• an evaporator having an evaporation cavity, wherein an inlet of the evaporation cavity is communicated with an outlet of the condensation cavity through a liquid inlet pipe;
• an expansion valve arranged on the liquid inlet pipe;
• an absorber located below the generator and having an absorption cavity for containing a sodium nitrate solution, wherein an upper part of the absorption cavity is communicated with an outlet of the evaporation cavity through a gas pipe;
• the absorber is provided with a liquid delivery pipe and a reflux pipe, an upper end of the liquid delivery pipe is communicated with the liquid storage cavity and a lower end of the liquid delivery pipe is communicated with a upper part of the absorption cavity;
• an upper end of the reflux pipe is communicated with the liquid storage cavity, and a lower end of the reflux pipe extends to a lower part of the absorption cavity;
• and a reflux pump is arranged on the reflux pipe;
• and
• a lithium bromide-water refrigerating machine, wherein a first cold water pipe and a second cold water pipe are arranged at a cold water output end of the lithium bromide-water refrigerating machine, the first cold water pipe being connected to the condenser to cool a gas in the condensation cavity, and the second cold water pipe being connected to the absorber to cool the sodium nitrate solution in the absorption cavity.