What Refrigeration Equipment Is Needed for Large-Scale CCUS Projects?

Carbon capture, utilization and storage (CCUS) projects are moving from small demonstration facilities toward larger industrial applications. As the amount of captured carbon dioxide increases, the supporting equipment must handle greater gas volumes, continuous operation, pressure changes, and demanding temperature-control requirements.

For petrochemical plants, refineries, oilfields, and other heavy industrial facilities, the challenge is not simply capturing carbon dioxide. The captured gas must be processed, compressed, cooled, transported, and eventually utilized or stored under controlled conditions.

This makes refrigeration and gas compression equipment an important part of the overall CCUS process.

A reliable industrial refrigeration unit can help maintain the required operating conditions during CO₂ processing, particularly when large gas-handling capacities and continuous industrial operation are involved.

Why Does Temperature Control Matter in CCUS?

Carbon dioxide behaves differently from many conventional industrial gases. Changes in pressure and temperature can significantly affect its physical state, density, and transportation characteristics.

After capture, CO₂ normally goes through several stages before reaching its final utilization or storage destination. Depending on the process design, the gas may need compression, cooling, dehydration, liquefaction, or further conditioning.

Each stage has its own operating requirements.

If temperature is not controlled properly, the efficiency of compression and downstream separation can be affected. Excessive heat generated during compression can also increase the cooling load and place additional stress on equipment.

For this reason, CCUS projects often require coordinated operation between compressors, heat exchangers, cooling systems, pumps, valves, and control equipment.

The refrigeration system is therefore not an isolated piece of equipment. It forms part of the thermal management strategy of the complete carbon-handling process.

How Does CO₂ Compression Affect the Refrigeration System?

Compression increases the pressure of carbon dioxide while also generating heat.

In a large-scale facility, this heat must be managed continuously. If the process includes multiple compression stages, intercooling or aftercooling may be required to bring the gas temperature back within the appropriate operating range.

This creates a direct relationship between compressor performance and refrigeration capacity.

A compressor operating under heavy industrial conditions needs to maintain stable gas handling while the associated cooling system removes heat efficiently.

The system designer therefore needs to consider:

• Gas flow rate

• Suction and discharge pressure

• Compression ratio

• Gas temperature

• Cooling capacity

• Operating hours

• Required turndown range

• Refrigerant selection

These factors should be evaluated together rather than selecting a compressor and refrigeration package independently.

Why Are Screw Compressors Suitable for Industrial Refrigeration?

Screw compressors are widely used in industrial refrigeration because they can provide continuous operation, relatively stable gas flow, and flexible capacity control.

Compared with reciprocating compressors, screw compressors are particularly attractive for applications where large gas volumes need to be handled over extended operating periods.

Capacity control is another important consideration.

Industrial processes rarely operate at exactly the same load throughout the day. Production rates, ambient conditions, cooling demand, and downstream process requirements can all change.

A compressor with adjustable capacity can respond to these changes more effectively than a system designed around a single fixed operating point.

For a large refrigeration installation, this flexibility can help reduce unnecessary energy consumption while maintaining stable process conditions.

What Makes the SRM-26L Relevant to Large Industrial Refrigeration?

The Swedish SRM-26 series is designed around open-type single-stage screw compressor technology for industrial refrigeration applications.

The SRM-26L is one of the larger variants in the series and provides a theoretical displacement of approximately 2,482 m³/h at 2,960 rpm, increasing to about 2,975 m³/h at 3,600 rpm.

Its capacity control range can operate from approximately 10% to 100%, providing a wide operating range for changing refrigeration demand.

The compressor also incorporates adjustable volume ratio control, with manual settings of 2.0, 3.5, and 5.0, while automatic Vi control can be available depending on configuration.

For large industrial refrigeration systems, these characteristics are useful because compressor operating conditions can change significantly between startup, normal production, reduced load, and peak demand.

Why Is Capacity Control Important in Continuous Industrial Plants?

A refrigeration system rarely operates at maximum capacity all the time.

During periods of lower production, running a large compressor continuously at full capacity can result in unnecessary power consumption. On the other hand, insufficient capacity during peak production can cause process temperatures to move outside the desired operating range.

A wide capacity-control range allows the refrigeration system to follow the actual process requirement more closely.

The SRM-26L's 10–100% stepless capacity control is particularly relevant in this context. Rather than treating the compressor as a simple on/off device, the refrigeration system can adjust its output according to the current load.

For large petrochemical and process refrigeration systems, this can contribute to more stable operation and better control of energy consumption.

What Should Engineers Consider When Selecting a CCUS Refrigeration Compressor?

Choosing equipment for a CCUS-related refrigeration system requires more than comparing displacement figures.

The first consideration is the refrigerant and process medium. The compressor and associated components must be compatible with the selected refrigerant and the intended operating conditions.

Pressure is another critical factor. The SRM-26L has a design pressure of 28 bar, but actual system design still needs to account for suction pressure, discharge pressure, pressure transients, relief protection, and applicable safety requirements.

Temperature conditions should also be evaluated carefully. The compressor's operating envelope needs to match the refrigeration duty required by the process.

Engineers should also examine maintenance requirements. Large industrial refrigeration systems may operate continuously for thousands of hours each year, so accessibility, lubrication, bearing design, monitoring, and spare-parts availability can have a direct impact on lifecycle cost.

How Does Compressor Reliability Affect Large CCUS Projects?

A carbon capture project can involve multiple interconnected processes. If one critical supporting system becomes unavailable, the impact may extend beyond the refrigeration unit itself.

For example, insufficient cooling can affect downstream gas conditioning. Changes in process temperature can then influence compression efficiency or storage preparation.

This is why industrial refrigeration equipment needs to be evaluated as part of the complete process rather than as an individual machine.

The SRM-26 series uses an i-profile rotor design, developed for stable screw-compressor operation and improved efficiency. The series also includes several variants, including S, M, L, and LL models, allowing different displacement requirements to be addressed within the same product family.

For large projects, having different compressor sizes within one series can simplify equipment selection as refrigeration requirements change between applications.

Where Can Large Screw Refrigeration Compressors Be Used?

The application of large screw compressors is not limited to CCUS projects.

They can be found in a wide range of industrial refrigeration environments, including:

Petrochemical facilities where continuous process cooling is required.

Refineries where refrigeration systems support gas processing and other temperature-sensitive operations.

Oilfield facilities where stable cooling can be required for processing and utility systems.

Chemical plants where controlled temperatures are essential for production processes.

Food processing facilities where large refrigeration capacity is needed for continuous production and storage.

The exact refrigerant, cooling duty, compressor configuration, and operating conditions differ from one industry to another. Equipment selection should therefore always be based on the actual process requirements.

Building a More Reliable Refrigeration System for CCUS

As CCUS projects increase in scale, supporting equipment must evolve alongside the carbon-handling capacity of the facility.

Compression and refrigeration are closely connected because increasing gas pressure also creates additional thermal management requirements. A well-designed system needs to control both factors while maintaining stable operation across different production loads.

Large screw compressors such as the SRM-26L provide one option for industrial refrigeration systems that require substantial displacement, flexible capacity control, and continuous-duty performance.

For engineers planning refrigeration equipment for CCUS, petrochemical, refinery, or other process applications, the most important step is to match compressor characteristics with the actual refrigeration load, refrigerant, pressure range, temperature conditions, and operating schedule.

The right equipment is not simply the compressor with the largest capacity. It is the one that can maintain the required process conditions reliably while fitting the operating strategy of the entire industrial system.

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​China HVAC Refrigeration

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