SCREW EXPANDERProject Summary

Project Structure

Technical Introduction

The Basic Principle

The Screw Expander is the kind of a positive displacement generator. The working principle is: the

liquid expanding when screw rotors flow through the YinYang, push the YinYang rotor rotate oppositely.

It makes the course of thermal energy turned into mechanical energy come true.

The Screw Expander consists of three steps: Intake, Expanding and Exhaust. The basic structure is

made of a pair of YinYang rotors and the casing. The thermal liquid (Steam, hot liquid or vapor-liquid phases) enter into

screw alveolus. With the force of the thermal liquid, the screw rotates.

With the increasing of the alveolus, the liquid expanding and finally exhaust at the end. The energy

changes and the power come out to drive the generator or the load.

Application Introduction

Application Area

Steel Mills

Paper Mills

Petro Chemical

Heat Recovery System/Pressure Reducer

Food Processing

Cement Plants

Bio Gas Boiler/Bio Mass Boiler/Geothermal/Geo Pressure/Heating Plants/Solar Thermal

Screw expander and turbine comparative advantage in small power parameters

Screw Expander Turbine

Suit for overheat steam, saturated vapor.

And it’s also suit for steam-liquid phases and

hydrothermal liquid. The

working

medium need low quality requirements.

Suit for overheat steam, saturated

vapor and wet steam. The working

medium need high quality requirements.

Structure of screw expander is simple,

easy to maintenance, normally running ten

years don’t need repair. According to

mechanical

speed driven driving work directly.

The steam turbine has a complex

structure, hard to maintenance. It’s need

to repair and check every 2—3 years. It need

professional team

and equipment. The rotate speed is very high.

Suit for low temperature and low pressure

steam.

The pressure< 3MPa, Temperature<300℃

, power<1500kW

Suit for high temperature and high

pressure steam. The pressure>4MPa,

Temperature>300℃, power>3000kW

The heat source

I. Hot Steam

Pressure Range Unit Installed Power

<0.3Mpa 30~50kW/ton

0.3Mpa~0.6Mpa 50~90kW/ton

0.6~1.0Mpa 90~120kW/ton

II. Flue Gas

Tem. Range Unit Installed Power

~200℃ 20~40kW/10 Thousand Standard Cubic Meter

~300℃ 80~100kW/10 Thousand Standard Cubic Meter

~400℃ 120~150kW/10 Thousand Standard Cubic Meter

III. Hot Water & Hot Liquid

Temperature Range Unit Installed Power

80℃ 0.3~0.4kW/ton water

90℃ 0.7~0.9kW/ton water

100℃ 1.2~1.5kW/ton water

120℃ 2.5~3.5kW/ton water

Technical characteristics

(1) Low quality requirement for the inputs

Screw expander is the only novel power machine that can recover superheated steam, saturated steam, steam-water

mixture , hot water and hot liquid so far. It can be self-cleaning and descaled, suitable to be applied to geothermal power

generation field conveniently.

The fluctuation of heat pressure and heat flow is allowed, and it is suitable for the features of i

ndustrial residual heat and generating utilization with moveable, integrated and dispersible characteristics.

(2) Safe and easy for use

No warming up, no barring gears, no run away, safe and reliable for direct impulse starting.

(3) long-term operation without major repair, convenient in maintenance

The operation of screw expander is simple and convenient. Bulky solid design for screw rotors ensures long-term

operation without major repair, convenient in maintenance with low cost, no need for professionals.

(4) One of key environmental friendly technologies

Screw expander can be applied to recover industry residual heat and waste heat for power generation and

used for renewable energy sources.

Design Capacity

Powerful thermodynamics and dynamics calculation models to improve the device reliability.

Independent control system and on-line observation system are provided to meet grid power requirements.

It can provide the most suitable and economic system solution for customers. Provide 3D models for

customers. Use the latest 3D design software.