CO2 subcritical cascade system

Product Introduction

Unit configuration:

Piston compressor, instrument panel, pressure controller, pressure sensor, electrical control box, oil separator, oil filter, globe valve, safety valve, suction filter, ball shut-off valve, electronic oil balance

Technical features:

Technical characteristics of Bizelle CO2 subcritical compressor:

a、 Parallel units provide multi-level energy regulation, and the cooling output dynamically matches the actual load;

b、 In parallel units, each compressor host is a backup machine for each other. Even if one compressor fails, other compressors can still work normally to ensure the normal operation of the system.

System advantages:

1、 Green and environmentally friendly

Using natural refrigerant CO2 as the refrigerant, with an ODP (Ozone Depletion Index) of 0 and a GWP (Greenhouse Effect Index) of 1, it is non-toxic and non flammable. Under low temperature conditions, it has a high COP value and a cooling capacity per unit volume that is 9-10 times that of other ordinary refrigerants.

2、 Intelligent control

The system adopts Siemens PLC to control various automatic control components. Running our company's self-developed self-control program can achieve stable, safe, energy-saving, and efficient operation of the entire system. It can achieve completely unmanned operation and remote monitoring.

3、 Safe and reliable

All components of the system are equipped with internationally renowned brands of equipment and accessories: the carbon dioxide compressor uses a Bizelle piston compressor, the ammonia compressor uses a Bizelle open screw head, and its motor uses Siemens brand; The self-control valves, liquid level, pressure sensors, etc. are made of Danfoss brand, the shielded pump is made of Haimitick brand, and the PLC is made of Siemens brand. Ensuring the safety and reliability of the equipment.

Compared with CO2 cascade systems using large single head screws:

1. Using traditional large single head screws, the single machine has a large gas transmission capacity. Once there is a malfunction on both the CO2 side and the high-temperature section side, the entire production line will be paralyzed and unable to operate normally;

2. Both the high-temperature section and CO2 section use parallel units, with multiple heads connected in parallel. Even if a single head fails, other heads can continue to operate without affecting the overall use of the system.

4、 Efficient and energy-saving

4.1. Flexible energy regulation:

Compared with the CO2 cascade system using a large single head screw, using a traditional large single head screw has a larger refrigeration capacity. If the production line output is small and only partial load is needed, the unit relies on sliders for energy regulation. When the load is below 75%, the power consumption of the compressor is not linearly related to the refrigeration capacity, which greatly reduces the actual COP of the unit. Especially when the load is below 50%, energy consumption will increase significantly; The ammonia/C02 cascade refrigeration system using ammonia parallel units and CO2 parallel units can automatically determine the number of units to be put into operation according to changes in load, ensuring that the units are always in optimal condition.

4.2. Wide range of energy regulation:

If the system CO2 compressor is equipped with 6 heads, the energy regulation range will be wider. When only one head is turned on, the cooling capacity is 16.7% of the total cooling capacity of the entire unit. If equipped with a frequency converter, it can be adjusted to 10% of the total cooling capacity, fully meeting the changes in production load and matching the cooling capacity generated by the unit with the production demand, in order to achieve high efficiency and energy saving.

4.3 Smaller starting current:

The ammonia and CO2 parts of the system are both connected in parallel units, which have a smaller starting current and lower pressure on the power grid.

4.4 Innovative Setting for Overheating Heat Exchanger:

Add a heat exchanger to the CO2 exhaust end to remove excess heat. Through siphon heat exchange, the excess heat from the CO2 exhaust is directly discharged through evaporative cooling, effectively reducing the compressor capacity required for the ammonia section. And it can significantly reduce system power consumption and improve energy efficiency.

Application parameters:

a、 Evaporation temperature range: -40~8 ℃;

b、 Optional condensers: evaporative condenser, air-cooled condenser;

c、 Optional evaporator: air cooler;

d、 Refrigerant: CO2;

e、 Compressor brand: Bizelle;