GB/T 30554-2014Terminology of screw expander (English PDF)

2.1 Types and type of screw expander

2.1.1 Screw expander

Working fluid within the rotor casing with a helical groove of expansion, driven rotation of the rotor, the rotor and the external work output volume expander.

2.1.2 Twin screw expander

Two screws engaged with each other by the composition of the expander screw.

2.1.3 Single-screw expander

It consists of a screw and star wheel consisting of two or more screw expander.

2.1.4 Screw back pressure expansion unit

Will be higher than the atmospheric pressure exhaust steam for heating or other purposes screw expander and ancillary systems.

2.1.5 Condensing steam screw expander unit

Directly into the condenser exhaust steam screw expander and ancillary systems.

2.1.6 Organic Rankine Cycle screw expander unit

Organic Rankine Cycle unit consists of screw expansion screw expander, an evaporator, a condenser and refrigerant pump and other components. Fluid through the first heat

Evaporator heating low boiling point working fluid, after screw expander to generate steam to promote the rotation, after the exhaust steam condenses in the condenser is pumped from the refrigerant to the evaporator recycle. Generally known as double loop screw expansion unit.

2.2 screw expander general terms, principles and design

2.2.1 Throttle

By controlling the valve opening of the throttle to change the flow of steam, in order to control the parameters of screw expander power adjustment method.

2.2.2 Bypass adjustment

By controlling the degree of opening of the bypass valve to adjust the screw expander power adjustment method.