HEAT AND COLD SUPPLY SYSTEMS IN PHASE SEPARATION UNITS USED IN PRODUCTION TECHNOLOGIES OF PURE INDUSTRIAL GASES

Abstract

In technologies of obtaining pure industrial gases an important role is assigned to heat and cold supply of phase separation units. They provide a cooling level of 125 K in the process of purification krypton, 175 K — xenon and 243 K — freon-216. We researched a cooling system of a multipurpose rectification unit for the production of krypton and xenon using adsorption-rectification technology. It is shown that using an intermediate cooling circuit on the basis of liquid nitrogen in the form of a thermosiphon provides a higher efficiency compared with high-pressure throttling cycles. The cascade system allows changing the temperature level in a wide range of temperatures by refueling the corresponding intermediate refrigerants; besides, it is also is less energy-consuming. As a system of heating and cooling the rectification column for purifying R216 from low-boiling impurities, a cascade system including a steam compressor refrigerating machine and a heat pump is proposed. The possibility of working on alternative natural refrigerants (R717, R22 and R407b) of a refrigerating machine and efficient working bodies (R114, R142b and R600a) of a heat pump has been proved.