Cryogenic Liquid Pump

1. Cryogenic Centrifugal Pump

A cryogenic centrifugal pump is a type of centrifugal pump similar to a water pump, primarily composed of a volute casing, impeller, and motor. The motor drives the impeller to rotate, using centrifugal force to fling the liquid to the edge of the impeller. The liquid then enters the discharge flow channel and subsequently the pipeline outside the pump chamber. Its main application is the transfer of large volumes of liquid. Due to its reliance on centrifugal force, the flow rate of a cryogenic centrifugal pump is relatively high, but its pressure is lower compared to a cryogenic reciprocating pump.

Cryogenic centrifugal pumps are primarily used for transferring cryogenic liquids such as liquefied natural gas (LNG), liquid nitrogen, liquid oxygen, liquid ethylene, and liquid carbon dioxide. Depending on their installation location, these pumps can be classified into stationary pumps and mobile pumps. Stationary pumps are installed on the ground, while mobile pumps are used in the cargo compartments of tank trucks.

In addition to providing the cryo pumps themselves, We, Zoiun Fluid & Gas, offer customized integrated pump solutions based on customer requirements. We can integrate valves, pipelines, and instruments onto a skid, providing a one-stop service that eliminates the need for customers to install these components on-site. We also supply complete pump accessories, including mechanical seals, lip seals, and corresponding instruments, valves, and sensors.

2. Recprocating Pump of Cryogenic Liquid

The cryogenic reciprocating pump, also known as a cryogenic piston pump, is a type of pump used to meet high-pressure requirements in work environments. Like the cryogenic centrifugal pump, it is also a type of cryogenic pump primarily used for high-pressure transfer of cryogenic liquids such as liquid nitrogen, liquid oxygen, and liquefied natural gas.

Operating Principle

The operating principle of the cryogenic reciprocating pump involves an electric motor driving a belt pulley for reduction, which then drives a gearbox to reciprocate the piston within the cylinder at the pump head. This reciprocating motion alternately draws in and expels liquid.

Main Applications

The cryogenic reciprocating pump is predominantly used in environments with high-pressure demands, including:

Gas filling stations: Used for filling gas cylinders, typically operating at pressures between 15 MPa and 25 MPa.

L-CNG stations: Used to refuel natural gas for household cars or taxis as fuel.

Foam production in shoe manufacturing: Utilized for high-pressure filling of nitrogen or carbon dioxide to produce shoe soles.

Gas pipeline maintenance: Applied in urban pipeline networks for high-pressure gas purging to maintain cleanliness and dryness within pipelines.

At Zoiun, we assure the design of the cryogenic reciprocating pump ensures efficient operation in various high-pressure scenarios, ensuring safe and stable liquid transfer and as well we offer the one-stop solution with pump sensors and valves together onto a skid.

3. Cryogenic Submerged Pump

A cryogenic submerged pump, also known as a cryogenic submersible pump, is essentially a vertically installed centrifugal pump. Its motor and pump body are submerged in a vacuum container containing cryogenic liquids, hence the term "submersible" pump. These pumps come in small and large sizes. Small submersible pumps are typically used at LNG refueling stations to supply fuel to large LNG trucks or buses. These small pumps are generally compact, usually not exceeding one meter. In contrast, large submersible pumps can reach heights of up to two or even three meters, often installed at natural gas receiving stations or natural gas power plants. Depending on their installation method, large pumps may be installed directly inside tanks, known as "in-tank" pumps, or outside tanks for liquid transfer, referred to as "out-tank" pumps.

Our company primarily provides small-scale submersible pumps for LNG refueling stations or small-scale gasification plants. We also offer integrated submersible pump solutions tailored to customer specifications. Conventional industrial pumps typically handle flow rates ranging from 6 cubic meters to around 20 cubic meters and achieve head pressures between 200 to 300 meters. They are primarily used for natural gas or liquid nitrogen transport. Due to their motor being submerged in low-temperature liquids, these pumps are not suitable for use with liquid oxygen.