0-50nm3 / H Oxygen Plant Spare Parts Cryogenic Turbo Expander Long Working Life

0-50nm3 / H Oxygen Plant Spare Parts Cryogenic Turbo Expander Long Working Life

1.description

Turbo expander is mainly used for cryogeniv plant, like cryogenic oxygen plant ,nitrogen plant.

It is to use adiabatic expansion inside the machine to create coldness in order to start up air separation units and make up the coldness loss, thus stablize the heat balance.

The expander is a mechine that when gas is expanded and depressurized, turbo outputs mechinical work in order to reduce the temperature of the gas so as to obtain the energy. . Expander is often used in cryogenic equipment, such as liquid oxygen plant, liquid nitrogen plant,etc.

2.refrigeration

A refrigeration system utilizes a compressor, a turboexpander and an electric motor.

Depending on the operating conditions, the turboexpander reduces the load on the electric motor by 6–15% compared to a conventional vapor-compression refrigeration system that uses a throttling expansion valve rather than a turboexpander. Basically, this can be seen as a form of turbo compounding.

The system employs a high-pressure refrigerant (i.e., one with a low normal boiling point) such as:

• chlorodifluoromethane (CHClF₂) known as R-22, with a normal boiling point of −47 °C;
• 1,1,1,2-tetrafluoroethane (C₂H₂F₄) known as R-134a, with a normal boiling point of −26 °C.

As shown in the figure, refrigerant vapor is compressed to a higher pressure, resulting in a higher temperature as well. The hot, compressed vapor is then condensed into a liquid. The condenser is where heat is expelled from the circulating refrigerant and is carried away by whatever cooling medium is used in the condenser (air, water, etc.).

The refrigerant liquid flows through the turboexpander, where it is vaporized, and the vapor undergoes an isentropic expansion, which results in a low-temperature mixture of vapor and liquid. The vapor–liquid mixture is then routed through the evaporator, where it is vaporized by heat absorbed from the space being cooled. The vaporized refrigerant flows to the compressor inlet to complete the cycle.