Screw expander is a type of positive displacement engine, which works by expanding the volume of thermal fluid in the channels of the male and female screws, pushing them to rotate in opposite directions, and achieving the process of converting thermal energy into mechanical energy.

Screw expander is a type of positive displacement engine, which works by expanding the volume of thermal fluid in the channels of the male and female screws, pushing them to rotate in opposite directions, and achieving the process of converting thermal energy into mechanical energy.

The work of a screw expander consists of three processes: intake, expansion, and exhaust. Its basic structure consists of a pair of female and male screw rotors and a housing. Hot fluid (steam, hot liquid or two-phase fluid) enters the screw slot A, and the energy of the hot fluid drives the screw to rotate to B C、D， The volume of the tooth slot increases, and the fluid is depressurized and expanded to work. Finally, it is discharged from tooth slot E to achieve energy conversion. The power of the screw expander is output from the main shaft male screw, which drives the generator to generate electricity or drives the load to save electricity. Technical Characteristics

(1) The power machine that consumes coarse grains

The screw expander is currently the only new type of power machine capable of recovering superheated steam, saturated steam, two-phase steam water, and hot water hydrothermal fluids; Capable of descaling and self-cleaning, convenient for application in fields such as geothermal power generation. The screw expander allows for a wide range of fluctuations in heat source pressure and flow rate; The machine is movable, centralized, and decentralized, which is very suitable for the characteristics of industrial waste heat and power generation utilization.

(2) Safe and easy to use

The operation of screw expander is not easy to accelerate, does not require special warm-up, and does not require turning. It can be directly flushed and rotated safely and reliably.

(3) Long term no major repairs, easy maintenance

The operation of the screw expander is simple, and the screw rotor is thick and solid, which can be maintained for a long time without major repairs. Minor repairs are simple and convenient, and the operation and maintenance costs are very low, without the need for specialized technical personnel.

(4) One of the key technologies for climate friendliness

It can be used for industrial waste heat recovery and power generation (recovering hot water and hot liquid above 70-80 ℃, all steam, and flue gas above 180 ℃), as well as for new energy (geothermal, solar thermal, and biomass thermal), and will become one of the important environmentally friendly power technologies to replace petrochemical energy on Earth.

Application scope of screw expander

Screw expander is a new type of thermal power device that is excellent for recovering low-temperature energy for power generation. It has the technical characteristics of strong universality, wide applicability of thermal energy, safe and convenient use and maintenance, energy saving and high efficiency. It achieves energy saving, emission reduction and economic efficiency without affecting the normal production of users.