Liquefied air separation products and natural gas are converted into a gaseous state using atmospheric evaporators of cryogenic liquids. The devices look like a set of air heat exchange panels with parallel-serial collection. The unit’s performance depends on the heat exchanger surface area, humidity, and ambient temperature. Maximum performance is achieved in dry, hot, windy weather.
Principle of operation
Liquefied nitrogen, oxygen, argon, and carbon dioxide are passed through a system of heat exchangers. The heat from the surrounding environment is sufficient to convert the pumped liquids into gas. There is no need to connect to external energy sources. After passing through the cryogenic atmospheric evaporator, the gases are transferred to containers or process lines.
Requirements for production evaporators for LNG regasification are set out in GOST R 55892-2013.
The heat exchange surface area is calculated based on the assumption that the temperature difference between the substance contained inside and the surrounding environment does not exceed twenty degrees Celsius.
Construction
An atmospheric evaporator for liquid oxygen and other cryogenic liquids looks like a frame with parallel pipes. The presence of fins increases the heat exchange area. Vertical installation takes up less space and is more efficient than horizontal installation. The evaporator inlet and outlet are equipped with flanged or threaded connections. Control, measuring, and safety devices are installed according to customer requirements.
Classification
Atmospheric evaporators are designed to operate at temperatures ranging from -196°C to +50°C at pressures of:
- as low as 40 bar,
- high up to 420 bar.
In low-pressure evaporators, contact with the external environment is provided by the surface of an aluminum profile with fins. In units designed for high pressure, stainless steel pipes are placed inside longitudinally finned aluminum cavities.
Production
RusGazCryo is the official dealer of the Chinese company Hangzhou Oxygen Plant Group, a recognized global leader in the manufacture of air separation equipment. We offer customers the opportunity to visit production sites, such as the atmospheric evaporator plant. Our reliable, durable equipment complies with regulatory requirements and Rostekhnadzor regulations, and is manufactured from high-quality anti-corrosion materials using high-tech solutions.
We offer a range of services: installation, commissioning, and staff training.