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Tampere, Finland

Lehto J.,VTT Technical Research Center of Finland | Oasmaa A.,VTT Technical Research Center of Finland | Solantausta Y.,VTT Technical Research Center of Finland | Kyto M.,Metso Power Oy | Chiaramonti D.,University of Florence
Applied Energy | Year: 2014

Fast pyrolysis bio-oils are completely different from petroleum fuels and other bio-fuels available in the market, as regards both to their physical properties and chemical composition. When the unusual properties of these bio-oils are carefully taken into account in system and burner design, their combustion without a pilot flame or support fuel is possible on an industrial scale. The aim of the paper is to review the work done on combustion of fast pyrolysis bio-oils and highlight the latest and most important findings of its combustion from laboratory fundamentals to industrial scale. The main focus of the paper is on the bio-oil burner applications.In recent industrial scale bio-oil combustion tests, bio-oil has been found to be technically suitable for replacing heavy fuel oil in district heating. In addition, it has also been found out that limited possibilities for further lowering particulate emissions exist, since the majority of the particulates are typically incombustible matter. Curves for NO. x-emissions of fast pyrolysis bio-oil combustion for air-assisted atomization burners are presented in the paper.Current burner designs are quite sensitive to the changes in the quality of the bio-oil, which may cause problems in ignition, flame detection and flame stabilization. Therefore, in order to be able to create reliable bio-oil combustion systems that operate at high efficiency, bio-oil grades should be standardized for combustion applications. Careful quality control, combined with standards and specifications, all the way from feedstock harvesting through production to end-use is recommended in order to make sure that emission targets and limits in combustion applications are achieved. Also the cost-effectiveness of the total package is extremely important. © 2013 Elsevier Ltd. Source


Patent
Metso Power Oy | Date: 2012-05-24

A boiler includes a flue gas duct and heat exchanger pipes in the flue gas duct. The boiler includes a planar silencer plate, which silencer plate includes sound absorbing material, and said first silencer plate being placed downstream of one of said heat exchanger pipes in the flow direction of flue gases in said flue gas duct. Furthermore, a silencer for a flue gas duct with a rectangular cross-section in a boiler, the silencer including at least a first and a second planar silencer plate substantially parallel to the flow direction of flue gases, the silencer plates including sound absorbing material. The first silencer plate is placed at an angle to the second silencer plate, wherein the width of the resonating area of the flue gas duct becomes narrower in two directions transverse to the flow direction of the flue gases.


Patent
Metso Power Oy | Date: 2012-03-13

In a method for processing ash, fly ash is separated from a product gas flow obtained from gasification of fuel, which fly ash is burned in fluidized bed combustion to reduce the carbon content of the ash. After this, the flue gases from the combustion are processed. In a first step, the ash is burned in fluidized bed combustion (fluidized bed reactor


A smelt spout area of a recovery boiler. A bank of smelt spouts is connected to a lower part of the boiler for directing smelt from the boiler to a dissolving tank. A working area is in front of the bank of smelt spouts. A shielding wall is located in front of the bank of smelt spouts and arranged movable in relation to the bank of smelt spouts to separate the bank of smelt spouts from the working area and persons working on the working area.


Patent
Teknologian Tutkimuskeskus Vtt and Metso Power Oy | Date: 2013-02-22

The invention relates to a method for producing a pyrolysis liquid, wherein the pyrolysis liquid is formed by means of pyrolysis from a raw material by forming, in a pyrolysis reactor, a gaseous pyrolysis product by pyrolysis and condensing it in a condenser into a pyrolysis liquid, and feeding circulation gas into the pyrolysis reactor. According to the invention, the circulation gas is conducted by means of a liquid ring compressor into the pyrolysis reactor and purified before being conducted into the pyrolysis reactor, and the pyrolysis liquid is used as the liquid layer in the liquid ring compressor. Further, the invention relates to a corresponding apparatus.

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