Fuels: Basis for the generation of energy

Biogenic dust from vegetable fibres is a CO₂-neutral fuel, which can be used for energy production, which is taking on an increasingly central role in the wake of the energy transition. Biogenic dust was developed in the course of a collaboration between GETEC and an international food producer, and adapted to the characteristics of GETEC's own dust-firing technology. This dust is an absolutely environmentally-friendly and renewable fuel made of native raw materials. Energy is released through the combustion of fibrous vegetable materials. Our biodust can be used in dust-fired plant as an environmentally-friendly fuel for the generation of steam and hot water. The major benefit of biodust is its sustainability. In combination with native lignite dust, biogenic dust can be used to improve the CO₂ balance of an existing, conventional dust-fired power plant. Due to the availability of the natural raw material, the long-term costs can be calculated.

Wood pellets are a native, future-proof and climate-neutral fuel, which is finding increasing use within the industrial sector. Biomass power plants can be operated efficiently using wood pellets, and generate electrical power, heat and steam. At the start of the process, timber waste is chipped, dried and pressed into pellets. The subsequent utilisation of this fuel type is CO₂ neutral, enabling a significant contribution to the reduction of the greenhouse effect. In addition, industrial enterprises benefit from the security of supply, lower transportation risks and an attractive cost balance. Because wood pellets are independent of oil and gas prices, the cost of pellets will remain comparatively low in future by contrast with other alternative biogenic fuels.

In combination with a biomass boiler, wood chips can be used extremely efficiently. Environmentally-friendly power and heat is generated through the use of combined heat and power technology. This energy can be used by the company directly on-site. This renewable fuel is made of chipped, non-homogeneous wood and is primarily used as a raw material in the timber processing industry. As with wood pellets, companies can benefit through the use of wood chips in terms of environmental-friendliness, sustainability, and stable procurement costs. However, the storage area required is relatively large, as the wood chips are rough cut and, therefore, have a relatively higher bulk density, for any given energy yield, than, for example, pressed pellets.

It is possible to "design" homogeneous fuels with the aid of the "coalification process", using heterogeneous bio-wastes such as leaf litter, garden waste, lawn cuttings or domestic organic waste. The process of hydrothermal carbonisation (roughly defined as: "watery carbonisation at raised temperature") is a chemical process used for the simple production of carbon-type fuels, synthetic gas, liquid crude oil pre-stages and humus made of biomass. This involves an exothermic process and the resulting energy release. This process, which, in just a few hours, technically mimics the natural creation (coalification) of lignite over many thousands of years is the result of research by Friedrich Bergius. There are currently several research reactors in various locations, where different combinations of raw materials and their impact on the fuel composition and/or fuel characteristics are being investigated. The high carbon efficiency (percentage of usable carbon in relation to the percentage of fixed carbon in the raw material), the short reaction period (conversion time), and the variability of the reaction control all contribute to further developments of the process.

Heating oil is an important energy source within the industrial sector. Heating oil is a by-product of crude oil treatment and is sold in four different grades, being: heavy, medium, light and extra-light, whereby the greatest difference is in the density of its constituent parts. In modern combined heat and power (CHP) systems, it is possible to use a combination of extra-light heating oil with other fuels, whereby the benefits are obvious: high energy efficiency, supply independence and the additional security of being able to stockpile fuel for future use. You are always able to react to the prevailing market prices and secure your energy supply. Moreover, heating oil requires no complex in-feed infrastructure and there are no contingency costs involved. In conjunction with time-limited performance peaks, heating oil represents the optimum alternative to other primary fuel sources due to both a lack of storage costs and contingency reserves. Modern storage and dispensing systems are designed for longevity and reliability.

The use of lignite dust technology enables the use of locally-sourced fuel, which, however, should not be confused with the untreated brown coal still used in many power stations. Lignite dust is extracted, treated, dried and milled from extremely high-grade brown coal with special combustion characteristics and a low ratio of inert inclusions. This refinement process yields a particularly homogeneous solid fuel, valued for its consistent fuel calorific value as a result of its low water content. High levels of availability throughout Central Germany, Lusatia and the Lower Rhine Region guarantee long-term price stability. The low procurement costs of this fuel type ensure a cost advantage over alternative primary energy sources, such as heating oil and natural gas.

Fuels derived from waste products are extremely important due to their ecological and economic significance. The fraction of such so-called alternative fuels within the overall fuel mix is increasing due to the increasing importance of sustainability among other things, whereby the source is relatively unimportant: the raw waste can come from the domestic or industrial sectors. By recycling these materials, valuable resources are saved and CO₂ emissions are reduced. Depending on fuel homogeneity, composition and average calorific yield, the plant technology used for the energetic exploitation of this fuel source tends to be extremely heterogeneous.

Examples of the exploitation and utilisation of alternative fuels:

• Industrial power stations
• Waste incineration plants
• Cement and lime industry