zeroBOG™ Empowers Sustainable Operations
- 4 hours ago
- 3 min read
drop, enabling efficient and reliable BOG management across LNG and emerging cryogenic energy applications. Credit:
Sulzer
The need for efficient and sustainable management of cryogenic gases extends far beyond traditional LNG applications. Enabling the recovery and reuse of boiloff gases, or BOG, across sectors such as hydrogen, e-methane and ammonia, supports the transition to low-carbon fuels and helps operators meet ambitious sustainability targets. This article examines how recondensation technologies such as Sulzer’s zeroBOG™ are becoming increasingly vital for future-ready facilities focused on minimizing emissions and maximizing resources efficiently.
Cryogenic systems face a unique set of operational challenges, whether in LNG, hydrogen or other emerging energy sectors, and these challenges demand innovative and reliable solutions. zeroBOG™ addresses them by offering a compact, lightweight recondensation technology that is up to five times smaller and approximately 30 percent lighter than traditional systems. Because BOG loads fluctuate depending on environmental and process conditions, zeroBOG™ features a self-regulating design that ensures stable and reliable performance, minimizing downstream impact during operational upsets. A pressure drop of less than 0.5 bar enhances flexibility and reduces energy consumption.
From a maintenance perspective, the system includes simplified controls and nonmoving internals, allowing operators to focus on core processes rather than troubleshooting equipment. zeroBOG™ versatility is key to efficiently managing BOG and minimizing emissions. This extends beyond LNG, making it suitable for liquid hydrogen, ammonia and other cryogenic applications while supporting the transition toward low-carbon and sustainable energy solutions.
The design philosophy for zeroBOG™ differs from traditional boiloff management systems by using liquid-continuous and direct-contact condensation that minimizes liquid hold-up and enhances tolerance for flow maldistribution. This design results in systems with up to a five-times smaller footprint and can be supplied as a fully modular package to enable faster installation. The unit provides operational stability and guaranteed total recondensation with a low pressure drop, less than 0.5 bar, that translates into lower operating energy compared with packed-bed recondensers or flare and oxidation strategies that waste valuable gas.
Some considerations operators should keep in mind when integrating zeroBOG™ into existing or new facilities include process and mechanical integration, including boiloff gas rates such as expected minimum and maximum capacities, to keep the recondenser in its optimal operating range, module interfaces and footprint to accelerate installation and simplify battery-limit tie-ins, including gas inlet, liquid recirculation, instrumentation and power requirements, and controls and operability by leveraging the self-regulating scheme with defined inter-locks such as BOG header pressure, liquid recirculation availability and level controls for safe operation.
As the energy sector transitions to low-carbon fuels, technologies like zeroBOG™ play a pivotal role in shaping the future of cryogenic energy applications. Although originally developed for LNG applications, the direct-contact recondensation approach is equally effective for managing boiloff gases in hydrogen, bio-LNG, e-methane, ammonia and even liquid CO2 systems. This versatility is critical as operators seek to minimize product losses, reduce emissions and comply with increasingly stringent environmental standards across a growing range of emerging energy alternatives.
In hydrogen applications, for example, zeroBOG™ helps prevent the venting of valuable and potentially hazardous boiloff gas, supporting both operational safety and ESG commitments. For other emerging markets, this technology ensures that low carbon fuels retain their environmental benefits by capturing and reusing boiloff gases that would otherwise be lost.
zeroBOG™ has been deployed across LNG carrier conversions, FSRUs, dualfuel vessels and terminals, demonstrating its reliability and economic value. A recent order for 12 standardized, modular units—compact enough to fit within a 2-meter height—was installed using existing cold energy, eliminating the need for a refrigeration cycle and highlighting cost and schedule advantages. As the industry advances toward low-carbon solutions, efficient boiloff gas management remains essential to reducing emissions and product losses while supporting net-zero goals.
