The Asia Miner

JAN-FEB 2017

The ASIA Miner - Reporting Important Issues to Mining Companies in the Asia Pacific Region

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Page 27 of 103

26 | ASIA Miner | Volume 14 • Issue 1 | 2017 INTEC GMK has developed power plants which produce electricity from solid plant biomass. The ECOCAL-modules are based on the Organic Rankine Cycle (ORC) process, which uses the operation of turbines to generate power. Organic media, which has a lower evaporation temperature than water, is used as working fluid instead of water. By means of these organic media, low-temperature waste heat from many industrial plants can be efficiently converted into electrical energy. ECOCAL-modules offer the capability of optimising the efficiency of small and average renewable energy power plants. Wood for the production of energy and waste timber from the in- dustry, which comes from the region, is stored in the fuel silo. From there it is transported into the firebox over the scraper conveyor. Inside the firebox the biomass is burned producing low emissions. The highly energised gas flows through the thermal oil boiler on the way to the chimney. There it releases its energy to thermal oil, which has a high boiling point, heating it up to about 300 degrees C. The thermal oil is carried off over a pipe system to the evaporator. There, the thermal energy from the oil is transferred to an organic medium, which is in the secondary cycle of the evaporator. Because the boiler works with a thermal oil, pressure is not need- ed for the heat transfer (primary cycle) to the real working medium (secondary cycle). The firing observation, therefore, is not affected by the regulations of pressure steam boilers. The organic steam flows over the fresh steam pipe to a specially developed axial tur- bine. There, the steam performs expansion work, which is converted to mechanical and electrical energy. After leaving the turbine the steam flows into the recuperator/condenser to transfer the conden- sation energy to the water heating system The condensed and liq- uefied working medium is drawn by the condensate feed pump and brought up to working pressure, closing the cycle. German-based INTEC GMK produces ECOCAL-modules with electrical power capacities ranging from 300kW to 2000kW. Lower power modules are specific applications that have to be planned separately. The working mediums used by INTEC GMK are highly efficient, environmentally friendly, cost-effective and toxin-free. EVER since they were invented more than 100 years ago end-of-life car and truck tyres have been a blight on the environment because until now there has been no means found to effectively and profit- ably recycle them. Grinding up old tyres to make crumbs or flakes is not a means of recycling tyres as the rubber has not been changed and there is a limit to how much of the material can be used for kindergarten playgrounds and sports fields while using it as a furnace fuel in Asia creates noxious, greenhouse damaging emissions. Then there is also the environmental problem caused by old tyre dumps or illegal- ly discarding them in bushland and waterways. However, using a technique known as destructive distillation, Green Distillation Technologies is able to turn this wasted resource and an environmental hazard into high demand valuable raw materi- als. The process is emission free and the recycled oil is used as the heat source for the production process. The first Green Distillation Technologies (GDT) commercial pro- cessing plant is 5km north of Warren in western New South Wales, northwest of Dubbo. The plant takes up about two hectares of a 21 hectare site leaving space for expansion and other projects, syn- ergistic industries and tyre storage within the limits imposed by the Environment Protection Authority. GDT established a pilot plant in Warren in 2009 to prove the tech- nology and has now moved to the current site where a commercial facility is being built. At full capacity it will be capable of annually processing 19,000 tonnes, which represents approximately 3% of the end-of-life tyres generated in Australia each year. The tyres are transported to the site by rail or road. Destructive distillation was developed from basic chemistry by technical director Denis Randall, utilising his 35 years of study and experimentation into organic waste streams. As a result GDT has developed the knowledge of getting the chemical reaction to occur. The process begins by loading whole end-of-life tyres into a pro- cess chamber, which is evacuated of air and sealed. In the initial steps no further processing of tyres, such as chopping or crumb- ing, is required. Heat is applied and acts as a catalyst for the chemical reaction, which sees the tyre destructed into different compounds. One of these compounds is collected and condensed into 'manufactured' oil. At the end of the process when the chemical reaction is over, the carbon and steel can be extracted cooled and separated. Generating power from solid plant biomass A unique process developed by Green Distillation Technologies turns old tyres into valuable raw materials. Turning old tyres into raw materials

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