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Natural Gas LNG System
Cryoquip, Inc., an industry leader in the engineering and manufacture of a diversified line of cryogenic vaporizing systems that can employ any available heat source, produces equipment systems for vaporizing LNG. These systems, complete with controls, use natural gas, ambient air, water, or steam as energy sources. The systems are designed for either stationary single site applications or as portable systems to be transported from site to site on available trailer or other mobile methods.
Applications include 'send out' vaporization systems for peak shaving plants, temporary gas pipeline supply in the event of emergency or scheduled shutdowns, vessel pressure building, or other process applications for either continuous or temporary service.
Gas fired units include the model WCVSP dual skid system and the model VFTU fire tube vaporizing system. Both systems require a modest amount of on-site electrical power for pumps (and any forced draft fans required).
The Model WCVSP System: Designed for portable use, the model WCVSP system consists of two skid assemblies. One skid, designed to be positioned beyond the classified class 1, group D, division 2 area, includes a gas fired, natural draft water (or water/glycol) heater with standing pilot, ballast tank and dual circulating water pumps with auto-switching. The second skid assembly, which meets NFPA 59A requirements, is designed to be located relatively close to an LNG storage supply within the classified area and includes a variable frequency drive, a submerged LNG pump, a water heated vaporizer, an odorant injection system (optional), and a startup fuel gas warm-up heater. The two skid assemblies are designed to be positioned at least 50 feet apart in the field in order to meet applicable codes, and may be field connected with sections of flexible water hose or piping spools. The heater skid is designed to be transported with water (or water/glycol> remaining in the system. No makeup water is required during operation.
Typical delivery pressures range from 50 psig to 450 psig for portable model WCVSP systems. Standard LNG capacities for the WCVSP series units are in the range of 1,200,000 SCFD to 7,200,000 SCFD. Higher capacity portable units can be made available on a special design basis. The specific power required during normal operation is approximately 0.2 kw-hrs. per thousand standard cubic feet.
The WCV series: Designed for stationary applications for capacities up to 120,000,000 SCFD or more, the WCV series contains essentially the same components as the model WCVSP system with the following configuration differences. The hot water heater(s) are stand-alone modules for location outside of the classified area. The water ballast tank and water heated vaporizer, depending on capacity, are either an integral module or a skidded assembly. The latter normally includes the tank and the circulating water pumps, and may or may not contain an LNG pump or odorizer injection system, depending on customer needs.
The VFTU series: The VFTU series model is a single skid model consisting of a forced draft burner system, and submerged combustion chamber at one end of a horizontal, water-filled ballast vessel. This model is typically used for stationary applications. The water is heated by combustion gas contained in serpentine combustion gas piping submerged in the water. This gas is vented to the atmosphere after being cooled by heat exchange. The opposite end of the vessel contains the LNG vaporizer tube bundle submerged in the water bath. The unit is a single 'integral heated vaporizer' module as defined in NFPA 59A. Economics often favors the model VFTU for capacities in excess of 9,500,000 SCFD. This model is frequently a choice for 'send-out' applications, particularly where multiple units are desired to permit operating flexibility. Maximum standard individual unit capacity is 36,000,000 SCFD.
Ambient Air Vaporizers for LNG Service: These units are available as either natural draft vaporizers (the most common type) or as forced draft vaporizers. A wide range of capacities and a wide variety of models are available, depending on the application required. Both high-pressure (typically 3,000 psig to 6,000 psig) and low-pressure (typically 250 psig to 750 psig) units are available. Portable natural draft ambient air modules for trailer mounting are available as well as units for stationary applications.Steam or Water Heated Vaporizer Systems: These units include the steam heated model VSU shell and tube vaporizer, the water/glycol heated model VWU shell and tube vaporizer, or the steam sparged model VSSU (water ballasted) vaporizer. These vaporizers are available for either portable or stationary applications for a wide range of capacities.
LNG Liquefaction Plants
Cryoquip, Inc. manufactures modular, skid-mounted nitrogen cycle LNG liquefaction plants, as well as expander plants for LNG production using pipeline pressure-let-down, LNG boil-off recovery systems, and nitrogen rejection units.
Typical plant capacities available:
- The nitrogen expander cycle plants: 5000 gpd to 60,000 gpd of LNG
- The expander plants using pipeline pressure-let-down have no particular maximum set capacity limit. Minimum capacity is 10,000 gpd.
- The boil-off recovery systems have no particular set capacity limits
- The nitrogen rejection units: approximately 30,000,000 scfd of feed gas
- Simplified low temperature refrigeration system
- Ease of operation
- No rotational equipment necessary in the Hydrocarbon stream
- Enhanced reliability associated with use of standard centrifugal components
- Capable of reducing storage boil off losses
- Safe, environmentally friendly, inert low temperature refrigerant
Nitrogen Rejection Units
- Employ same nitrogen expander cycle as LNG liquefaction plants for low temperature refrigeration, with same corresponding advantages
- Standard size units handle up to 30 mmscfd of gas. For larger capacities contact the factory or your sales office