from the Power of Waste Resources
GS Energy has adopted new environmental yet economic technology to process waste.
GS Energy’s “Waste to Energy – Power and Waste Management Stations” are based on new waste management technology that has been developed over the many years of Research and Development by the Australian Company, Corky’s Carbon and Combustion.
This technology has been tested and patented and carries all required certification to carbonate and gasify waste and generate green power contributing to a cleaner future for all.
GS Energy’s aim is to use the latest in Technology to efficiently generate green power, bio-char and other useful by-products Sustainably.
WtE stations provide the capability to carbonate and gasify waste in a combined cycle process to produce syn-gas and heat, driving gas engines and heat turbines for “Carbon Neutral” power generation. In the case of Municipal Solid Waste (MSW) our gasification process is classified ‘carbon neutral’. However, our process is in fact carbon negative. For example, for every 1,000 tonnes of MSW processed through GS Energy’s carbonation and gasification processes, a saving to the atmosphere of 3,520 tonnes or more of carbon is achieved.
The waste to energy cycle efficiency (chemical energy to electrical energy) is about 36% which is world class at any scale and absolutely leading edge at this small scale. This is possible due to the split nature of the process vessels (patented technology), the ability to use heat exchangers between steps and the fact that the process is based on the use of heat to break down complex chemical substances into simpler substances and gasification, in an closed cycle.
The key to achieving the operation of waste to energy projects are:The biomass is truly waste The project is located as close as possible to the power users and the biomass feedstock.The power plant is as small as possible to minimise transport of waste and power transmission losses.The power plant is water neutral or has the ability to produce excess water so that it can be used in dry areas.The power plant is world’s best practice with respect the emissions.
The technology utilized in GS Energy’s Waste to Energy – Power and Waste Management Stations is the combination of the following processes:
1. Pre-Bulking Drying process
2. Gasification process
3. Combined Cycle process
4. Small Scale and Modular
The technology utilised in GS Energy’s WtE – Power and Waste Management Power Stations are designed to:Reduce the impact of the poor economy of scale of small to medium power stations. Process wet biomass (typically 50% water not just seasoned chipped wood). This means that waste such as leaves, grass and pruning can be used. Operate water neutral for most stations. The larger units can recover water from the wet biomass with the addition of extra equipment. Recovery of liquid water means that these plants do not use external water, even in hot climates. Have chemically active scrubbing between stages with the inclusion of a bag house for all exhausts providing for excellent emissions profiles.
Not only has this technology enabled waste to generate energy in an environmentally friendly manner, but the outputs produced are very financially rewarding.
Many of the stations could be solar supported which gives further efficiencies and environmental benefits to the total energy generation process. Portability is also a real benefit as stations can be decentralized to enable maximum transport efficiencies and minimum power losses through distance.
GS Energy’s practice of delivering green power from waste resources also provides in some cases, useful by-products. These by-products are mainly produced from the green power generation processes using green waste and sewerage sludge as fuel. This key by-product is in the form of soil conditioner and/or compost and can be used in garden or commercial soil enrichment.
In this process the feedstock waste is heated and the water content of the waste is evaporated.
By pre-drying the feedstock waste, less water will be evolved in the syngas and it will result in a higher quality fuel.
2. The Gasification process
This process of Gasification of biomass is relatively simple and has been practiced for over 80 years. However, the trace compounds produced in the gasification of the waste feedstock produces a synthesis gas that can have significant negative impact on gas engine operation, maintenance, and environmental performance. Synthesis gas, called syn-gas is a mixture of nitrogen, carbon monoxide, hydrogen, methane and carbon dioxide.
If the biomass is sourced from council waste referred to as Municipal Solid Waste (typical MSW is between 60 to 80% biomass) then extra attention is required for these impurities. This technology directly addresses the destruction and capture of these traces impurities from the syn-gas by including additional processes using bag house filter bags, heat exchanges, pyrolysers and scrubbers.
3. Combined Cycle process
A combined cycle is characteristic of a power plant that uses both a gas engine and captures the waste heat from that engine and uses that in a heat engine.
Heat engines are only able to use a portion of the energy their fuel generates (usually less than 50%). The remaining heat (e.g., hot exhaust fumes) from combustion is generally wasted. Combining two or more thermodynamic cycles, results in improved overall efficiency.
In a combined cycle power plant, a gas turbine generator generates electricity and the waste heat is used to make steam or in our case refrigerant vapour (organic Rankine cycle) to generate additional electricity via a turbine; this last step enhances the efficiency of electricity generation.
The waste heat from the Rankine cycle is used in the dryer and drying floors. Plus the heat generated from the station can be utilised by supplying hot water / refrigeration to nearby properties.
4. Small Scale and Modular
The power and waste stations comprise of small modular units which enables each station to be designed specifically around the amount of waste that needs to be disposed of. This flexibility enhances affordability and profitability of the stations.
ABC's Stateline NSW - 9 April 2010
Greener Energy for Communities
ABC Stateline NSW - www.abc.net.au/news
Many councils are looking at turning their community's household and industrial waste into their own electricity by using biomass gas plants. ABC's Stateline NSW investigates.
| ACN 147 561 671
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