LNG Regasification & Storage

Consolidated Gas-to-Power System Increases Operational Efficiency

• Operation windows with different databases can be cross monitored in each plant

The two main uses of LNG are power generation and town gas supply. The number of Gas-to-Power projects, in which a gas power plant is constructed in conjunction with an LNG terminal, is increasing in countries with growing power demand. Consolidated operation between the LNG terminal and the power plant is required more since each plant operation affects the other. For example, an unexpected incident at an LNG terminal may cause a significant decrease in the pressure of gas delivery, which can result in a gas turbine trip or parallel-off of generators at a power plant. An unexpected problem with a gas turbine at a power plant may cause excessive gas supply, which forces the LNG terminal to suppress the gas supply. Consolidated operation enables agile operations, such as first cut-out, and efficient balancing of the gas supply and demand at each plant. Yokogawa provides a consolidated operating environment while securing each company’s data independently, based on long expertise in power generation and LNG terminal automation.

Operators Take Quick Action to Prevent Alarms

• Yokogawa’s online simulator MirrorPlant predicts LNG regasification plant behavior

Yokogawa's MirrorPlant dynamically simulates the behavior of a plant by updating the model’s parameters using feedback from the real plant. By applying DDR (Dynamic Data Reconciliation) algorithms, a more precise representation of the current state of the process is achieved. MirrorPlant calculates LNG calorific value by using factors such as Boil-Off Gas (BOG) and calculates delivering gas quality (calorific value and odor concentration), and visualizes the results in graphical and trend form. MirrorPlant forecasts possible alarms by predicting the process behavior of the LNG terminal. Then agile action can be taken according to these predicted behavior changes to ensure stable operations.
 

Highly Automated and Highly Reliable Systems Ensure a Stable Gas Supply

• Yokogawa provides field-proven software and redundant configurations

Advanced terminal unit control (ATUC) is a group of software modules on DCS controllers developed through Yokogawa’s extensive experience working with gas companies. ATUC is specialized for LNG terminal control, optimizing load sharing according to demand changes and achieves immediate control during unexpected conditions. ATUC also enables automated supply volume without the operator’s intervention, lowering the load on operators. By implementing ATUC in redundant configuration, continuous supply is ensured in case of unexpected incidents and during maintenance.
 

LNG Unloading

• Recirculation Flow Control
• Return Gas Temperature and Pressure Control
• LNG Drain Drum Level Control
• Uploading lineup control
• Berth Monitoring System
• Unloading Arms Packaged System Function

LNG Tank

• Tank Inlet Mixing Line Valve Control
• Tank Pressure Control
• Level, Temperature, and Density Monitoring
• In-tank Pump (LP Pump)
• Pump Start/Stop Control
• Kickback Flow Control
• Supply Chain Scheduler

Open Rack Vaporizer (ORV)

• LNG Flow Control
• Seawater Flow Control
• Seawater Pump Control
• Start/Shutdown Sequence Control

BOG Compressor / Recondenser

• Compressor Start/Stop Control
• Suction Drum Temperature Control
• Kickback Flow Control
• Recondenser Control
• Packaged PLC Functions
• Capacity Control

HP Send・out Pump

• Pump Start/Stop Control
• Discharge Control
• Kickback Flow Control

Submerged Combustion Vaporizer

• LNG Flow Control
• Packaged System Functions

Fuel Gas and Service Gas

• Fuel Gas Pressure Control
• Fuel Gas Heater Control

Send Out Control

• Send out Header Pressure Control
• Send Out Gas Calorie Control
• Gas Odorization Flow Control