CONDENSATION UNIT OF CARBON DIOXIDE Russian patent published in 2020 - IPC F25J1/02 F28B5/00 

FIELD: technological processes.

SUBSTANCE: invention relates to apparatus for condensing carbon dioxide in power plants. Carbon dioxide condensation unit includes a carbon dioxide supply line (2) from the carbon dioxide source (1), cold source (7), a heat and mass exchange apparatus and refrigerating unit (19). Plant contains residual heat recovery unit (3). Heat and mass exchange apparatus is heat-mass-exchange apparatus (4) of low pressure. Plant additionally comprises heat-mass exchange device (6) of high pressure and heat and mass exchange device (5) of intermediate pressure. Each heat-mass exchange device (4, 5, 6) includes heat exchanger (8) of cold supply line connected by cold source (7) and residual heat recovery unit (3). Each heat-mass exchange device (4, 5, 6) includes bubbler (9), at that bubbler (9) of heat-mass-exchange apparatus (4) of low pressure is connected to line (2) of carbon dioxide supply from source (1) of carbon dioxide. Inner volumes of heat-mass-exchange apparatus (4, 5, 6) are connected to each other through throttles (14) configured to control the level of condensed carbon dioxide in each heat-mass exchange apparatus (4, 5, 6). Heat-mass-exchange apparatus (4) of low pressure and at least one heat and mass exchange apparatus (5) of intermediate pressure are connected to lines (10) for discharging gaseous carbon dioxide, wherein each line (10) for discharging gaseous carbon dioxide gas includes compressor (11) configured to supply gaseous carbon dioxide gas through a residual heat recovery unit (3) to bubbler (9) of the heat-mass-exchange apparatus of the next pressure stage, which reduces consumption of energy spent on condensation of carbon dioxide, as well as the return of at least part of the spent energy in the cycle. Heat-mass-exchange apparatus (4) of low pressure and heat and mass exchange apparatus (5) of intermediate pressure are connected to line (12) for discharge of liquefied carbon dioxide by pumps (13), configured to discharge condensed carbon dioxide from said heat-mass-exchange apparatus (4, 5) into heat-mass exchange apparatus (6) of high pressure. Discharge line (15) from the high-pressure heat-mass exchange apparatus (6) of liquefied carbon dioxide gas is configured to discharge at least a portion of the liquid carbon dioxide gas to the burial place, and the other part – to high-pressure pump (16) through the residual heat recovery unit (3) to the consumers.

EFFECT: technical result consists in reduction of energy consumption, spent for condensation of carbon dioxide, and also return of at least part of spent energy in cycle in form of heat of carbonic gas in supercritical condition.

6 cl, 1 dwg