NH3/CO2 cascade refrigeration system
1. NH3/CO2, the principle of cascade refrigeration system
The NH3/CO2 cascade refrigeration system operates with dual stages: high temperature and low temperature. In the elevated temperature stage, NH3 serves as the refrigerant, while CO2 is used at the lower temperature stage. The NH3 refrigerant evaporates in the high-temperature system to effectively condense the CO2 gas emitted from the low-temperature system. A condensation evaporator bridges these two stages, functioning dually as the condenser for the low-temperature level and the evaporator for the high-temperature stage.
Heat is efficiently transferred to the CO2 refrigerant through the end evaporator. The absorbed heat by CO2 is then transferred to NH3 refrigerant in the condensing evaporator. This high-temperature NH3 refrigerant releases the heat to the environment via the high-temperature condenser using a cooling medium. The condensed CO2 from the evaporator moves to the CO2 reservoir, progressing to the CO2 gas-liquid separator through a dryer filter and throttle valve. Liquid CO2 is pumped to the CO2 evaporator, absent of end cooling devices like single freezers or chillers. After evaporation, two-phase CO2 returns to the separator, and gaseous CO2 gets compressed back into the condensing evaporator. This cycle ensures a seamless refrigeration process.
In the NH3/CO2 cascade system, high and low temperature levels are distinct single refrigerant systems. The high-temperature NH3 system mirrors conventional setups, encompassing a refrigeration compressor, condenser, liquid storage, gas-liquid separator, and throttling device. The CO2 system, for lower temperatures, includes a CO2 compressor, condensing evaporator, reservoir, separator, filter dryer, pump, throttling device, evaporator, and expansion vessel, providing a comprehensive refrigeration solution.
The The CO2 gas-liquid separator efficiently isolates CO2 gas droplets from the evaporator within the CO2 compression system. This prevents compressor wet stroke and maintains liquid level stability during pump operation, accommodating liquid return when the pump ceases. If the separator functions as a CO2 reservoir when inactive, it must contain the system's entire CO2 liquid volume. An auxiliary evaporator atop the separator mitigates excessive CO2 pressure post-shutdown. In the NH3/CO2 system, the condensing evaporator acts as both NH3's evaporator and CO2's condenser, where compound liquid evaporates and absorbs heat in the tube, turning CO2 gas into a liquid within the shell.
2. Advantages of NH3/CO2 cascade refrigeration system.
(1) Enhanced safety with reduced NH3 risks:
(1.(1)) The NH3/CO2 system significantly decreases the NH3 condensing pressure to about one-tenth of traditional ammonia systems.
(1.(2)) NH3 is confined to machine areas, monitored by experts, akin to a 'tiger' securely in a 'cage'.
(1.(3)) Exploits NH3's excellent heat transfer properties in high-temperature zones to cool CO2 effectively.
(2) CO2 is utilized within personnel-intensive operational spaces, like single-freezing machines and warehouses, ensuring safety for personnel and property.
ab70440d
| Compressor type |
Piston, screw |
| Condensor |
enough condenser heat exchanger surface |
| Fan type |
Axial fan:High degree of protection, large Air flow, low noise |
| Unit kinds |
Open type, box type, side discharge type |
| Cooled type |
Air cooled |
| Refrigeration type |
R717;R507;R22;CO2 |
| Copper tube connector |
fitting reducer |
| Place to assemble |
Indoor/out door(concrete construction building/steel
construction building). |
| Voltage |
220V/50HZ, 220V/60HZ, 380V/50HZ etc |
| Controller |
Automatic electric controller, PLC |
| Warranty |
1 Year |
| Case material |
The galvanized sheet is coated with plastic powdered painted |
| Quality Assurance |
2.6Mpa leak-proof stress test |
| Package |
Plywood box and pallet |
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