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1. INTRODUCTION Recent trends indicate that the delivery of electricity is becoming increasingly less reliable. As a result, there is a search for means to be less dependent on the public electricity grid. In contrast, interruptions in gas supply are very rare. In the Netherlands, for example, there has only been one systemic interruption in gas delivery in the last 30 years. Furthermore, the high power grid nearly operates at its full capacity, and it is difficult and expensive to expand this network. In the future a significant demand for “self-powered” systems is anticipated, as to avoid these problems. In the last few years, small turbines, which are easy to install and suitable for decentralized power generation, have become commercially available. Normally they are grid-connected, but in case of grid-failure they can switch to “island operation”. The efficiency of these modern micro turbines is about 30%, significantly less than the approximately 50% obtainable using modern CHP units. Therefore these small turbines are generally not used for stand-alone power generation. The flue gases leaving the microturbine have a temperature of about 300°C and contain about 18% O2. Clearly, using both the heat and oxygen in the flue gases would increase the overall efficiency of the unit. Figure 1 BurnerGen PackTM For Gasunie Engineering & Technology (GET), it was clear that the use of microturbines for decentralized power generation must be integrated in existing boiler and burner systems. In this fashion, both the heat and excess oxygen can be used as part of the combustion air. Of course, it is also possible to increase the efficiency by using an external heat exchanger mounted directly in the exhaust gas flow of the microturbine, but the BurnerGen Pack (Burner Generator Pack) solution combines the boiler as heat exchanger and the burner to consume the remaining O2 in the flue gases as combustion air. The BurnerGen Pack makes it possible to generate electricity locally on small scale, with efficiencies approaching 100%. See Figure 1 for a general setup. To reuse microturbine flue gases in existing boilers we developed an adapter which makes it possible for a burner to operate on both fresh air and turbine flue gases. In essence, this “dual-air burner adapter” is the heart of the BurnerGen Pack. Full scale tests in the laboratory at Gasunie Engineering & Technology were very successful. Met opmaakPDF Image | SELF POWERED BOILER HOUSE: A NOVEL METHOD FOR INCORPORATING A MICRO TURBINE INTO AN EXISTING DOMESTIC ENERGY INFRASTRUCTURE FOR HEAT SUPPLY TO HOUSEHOLDS
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