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Max Universal’s Proprietary LNG Process

Max IC3R-MR™ (Integrated Propane & Mixed Refrigerant Refrigeration)
LNG Process

 

 

 

 1. Features of the Process

• Specially designed for small-scale (2 x 10 Nm³/day to 150 x 10 Nm³/day) natural gas liquefaction plants and peak shaving plants.
  

• Advanced refrigeration design to minimize energy consumption. Refrigeration energy consumption of 0.15 - 0.18 hp/lb LNG (9.5 – 12.0 kW/ton-day LNG) compared to the reported design refrigerant energy consumption of 0.18-0.25 hp/lb LNG (12.2 – 16.8 kW/ton-day LNG) for the existing MR LNG processes.
  

• Integrating propane refrigeration cycle into main heat exchanger makes the process more suitable to large range of feed gas composition fluctuations, and changes in ambient conditions.
  

• The mixed refrigerant is a mixture of nitrogen and hydrocarbons ranging from methane to butanes, which makes minimal temperature approach in the main heat exchanger and achieves high refrigeration efficiency.
  

• The unique design of the main heat exchanger and heavies separation makes the process more efficiently and easily handle different gas from lean pipeline gas to rich gas with significant heavies content.
  

• With the integration of propane refrigeration and mixed refrigerant refrigeration, the process offers turndown ability while maintaining operating efficiency. By adjusting the operation parameters of the two refrigeration systems, the process can be run at less than 20 percent of design capacity while making specification LNG.
  

• The process is designed to contain the refrigerant during extended shutdown periods. Even the low-pressure suction portion of the system is designed for settle out pressure of the system. This design aspect minimizes refrigerant venting and makeup and allows rapid startup after a system shutdown. The typical time required for initial startup of the liquefaction plant is three to six hours. After a short shutdown, normal operation can be obtained within an hour.
  

• Use of a single brazed aluminum plate fin heat exchanger is another key to process simplicity and ease of startup and operation.
  

• Employing proven process equipment such as brazed aluminum plate fin heat exchanger and electric motor driven centrifugal refrigerant compressors provides a desired long-term operational reliability.
  

• The refrigeration system maximum operation pressure is less than 350 psig, which requires only ANSI 300 system design pressure and therefore reduce the cost.
  

• A deethanizer can be installed to provide LPG and heavy hydrocarbon cuts. This is as an option design.

2. Plant Composite

• Feed gas compression system if gas available pressure is less than 800 psig (5.5MPa.G).
  

• Amine unit (MDEA) to remove CO2 to less than 50 –100 ppm(v) and H2S to 4ppm(v).
  

• Molecular sieve system (two tower system) to remove water to less than 1ppm(v) and mercury content to less than 10 nanogram/Nm³.
  

• Propane refrigeration compressor (motor driven centrifugal type).
  

• Mixed refrigerant compressor (motor driven centrifugal type).
  

• Main heat exchanger (brazed aluminum plate fin type).
  

• Optional installation of deethanizer for recovery of LPG cut.
  

• Optional installation of power generation system if electricity is not available.

3. Typical Plant Design Parameters

Typical plant design parameters with the following treated dry gas composition are shown in table-1.

 Note 1: Assumed feed gas pressure = 0.2MPa.G

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