Waste management is a critical issue for most African cities as a result of the huge generation of mountains of waste stemming from increases in urban populations over the last few decades, coupled with access to consumer goods by a fast-growing middle class. And waste generation is expected to increase rapidly in the future. City authorities are therefore faced with the challenge of managing urban waste with limited resources at their disposal. Unsustainable waste management has adverse consequences on the environment including the breeding of mosquito and related diseases, emission of obnoxious odours and methane, and flooding caused by choked drainage systems. These waste-related problems are not uncommon in most African cities and city authorities are seeking sustainable waste-management solutions. Indeed, unraveling sustainable solutions for efficient waste management is one of the top priorities for African countries.Access to energy and electricity in particular, is an indispensable condition to develop economic activities and to improve the quality of life. The use of electricity is a key factor to make agricultural and industrial processes more efficient. Electricity is needed for households (cooking, lighting, refrigeration, and home-based activities) but is also needed for essential facilities such as hospitals, schools, and for industry. Energy consumption and energy access is an important issue directly related to income and poverty, as limited and unreliable energy access translates into poverty, limited employment opportunity and poor economic performance, and it is a major impediment to economic growth. Because Suxé optimise the combustion to 100% even when burning City Waste, Suxé are able to offer solutions that meet and exceed the World standards for clean emmissions.
As cities rapidly grow, so does the amount of waste that they generate. Changing human consumption patterns and the changing structure of economic activity generate various types of waste that must be appropriately managed to ensure sustainable development and a decent standard of living for all urban residents. In low-income countries, in particular, rapid urban growth is putting extraordinary pressure on limited urban resources for the provision of these essential basic services, further straining capacity in urban management.
Furthermore, inappropriate policies have contributed to the growth of life- and health-threatening slums, where urban waste management services are often woefully inadequate. Indeed, there is perhaps no area where the capacity to manage urban change is more urgent and more challenging than in informal settlements and slums. Poverty, social and economic exclusion, and the lack of affordable housing constrain the habitat choices of hundreds of millions of people in Africa.
Policy makers have not responded appropriately, often denying service provision to these settlements. As a result, 62% of urban populations in Sub-Saharan Africa live in slum areas dominated by uncontrolled informal spatial developments, most often located in environmentally fragile areas, and without access to basic services such as water, sanitation, energy and transport and waste management systems.
Suxé's Pyrolysis Plant is the Solution to Africa's Waste Problems
Pyrolysis of waste is pertinent in the context of the energy crisis. Development work has been done with a 100 tonne/ day plant.
The process is self - suflicient and regenerative.
A valuable byproduct is tar oil, which is a substitute for furnace oil. Char can be used as a domestic fuel or fertiliser production.
In the backdrop of energy crisis and investigations conducted, it is economically viable to employ pyrolysis of MSW (Municipal Solid Waste) and industrial waste in the metropolitan cities in Africa.
Suxé's solution is viable because it not only converts garbage to solid, liquid and gaseous fuels but produces valuable chemical and other feed stocks for downstream processing , as well as producing electricity.
For Example a 2000 tonne/day of city garbage, when subjected to pyrolysis will yield 600 tonnes of char, 30 tonnes each of glass and metal and 80000 litres of oil. Therefore, recycling of municipal solid waste by the pyrolysis route is not only an answer to the waste disposal problem but an answer to the energy crisis also.
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Pyrolysis is the thermal degradation of a substance in the absence of oxygen. This process requires an external heat source to maintain the temperature required. Typically, lower temperatures of between 300C to 850C are used during pyrolysis of materials such as MSW. Raw municipal waste would require some mechanical preparation and separation of glass, metals and inert materials (such as rubble) prior to processing the remaining waste. Suxé Pyrolysis plant needs consistent feedstocks. The products produced from pyrolysing materials are a solid residue and a synthesis gas (syngas).
The solid residue (Char) is a combination of noncombustible materials and carbon. The syngas is a mixture of gases (combustible constituents include carbon monoxide, hydrogen, methane and a broad range of other volatile organic compounds). A proportion of these can be condensed to produce oils, waxes and tars.
The syngas typically has a net calorific value (NCV) of between 10 and 20MJ/Nm3. If required, the condensable fraction can be collected by cooling the syngas, potentially for use as a liquid fuel. One key issue for use of syngas in energy recovery at Suxé facilities was a solution to deal with tarring. The deposition of tars can cause blockages and other operational challenges and has been associated with plant failures and inefficiencies at a number of non-Suxé pilot and commercial scale facilities. Suxé overcome the tarring issues by using a higher temperature secondary gasification processing. Advanced Thermal Treatment - Gasification The application of a higher temperature secondary processing phase may be used to ‘crack’ the tars and clean up the syngas prior to feeding the Syngas back to the Suxé burner for energy production. This process is referred to as ‘gas clean up’ or ‘polishing’ and enables higher efficiency energy recovery than applicable through other waste thermal treatment processes. It should be noted however Suxé utilise a secondary combustion chamber to burn the syngas and recover energy via a steam circuit.
Ultra Flexibility using WDF , Increased Clean Power Generation and Top Quality DesignFind out how
Suxé's Community Power Station can operate on Anthracite, coal, lignites, wood, wood chips, pelletised wood, waste derived fuels, bio-fuels or bamboo.
The Suxé Energy Centre has been purposely designed especially to suit the environment in Africa. The Energy Centre doesn't use steam to generate electricity it uses an air turbine, it has no need to be sited by water, or have a large dam constructed by the side of the power station, like other conventional power stations must do. Therefore it can operate anywhere so long as fuel is available.
Efficient combustion relies heavily on controlling the excess air going into the combustion chamber. Too much and you have free oxygen that can combine with nitrogen or sulphur, making nasty gases. Getting the oxygen content right is the job of Suxé's patented computer system. 97% combustion efficiency means NO harmful gases.
The revolutionary air turbine operates like a jet engine in reverse. Hot gas is compressed before the turbine and ambient temperature air is added. This expands rapidly creating a huge pressure in front of the turbine. As the hot gas passes through the turbine it rotates and drives the rotation of the generator, which produces the electricity.
Due to the revolutionary air turbine and the fact that the Energy Centre needs no water to operate, it can be sited in the most unlikely and harsh environments. So long as there is an available fuel source locally, the Energy Centre will produce electricity. Which means the Suxé Energy Centre can be located at the end of a transmission line, where power is needed.
The Suxé Energy centre has been designed to plug together in 50MWe modules. Therefore the sizing of the power station is easy as for 200MWe you need 4 modules. These are delivered to site in containers that are simply plugged together. Everything is pre-tested before it leaves our factory, we deliver a power station to site that produce electricity immediately.
Suxé have been providing combustion equipment and burner solutions across the World since 1951. The basic principles have remained the same whilst the designs have been modernised to deal with 21st Century fuel source requirements. Modern solutions to modern problems.
Growing Bamboo around each power station can provide hundreds of new employment opportunities in each area.