Biomass as Fuel in Small Boilers (PDF 6.4 - APO Asian Productivity ...

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Biomass as Fuel in Small Boilers ( ... Continued) Combustion It is difficult to maintain good combustion because: - Air fuel mixing is not proper; - Bed height is stationary, resulting in clinker formation; - Avoiding air channel is difficult; - Due to intermittent ash removal system it is difficult to maintain good combustion. Moisture High moisture leads to bed choking and difficult combustion conditions. Combustion is better with an improved version of pile combustion. Since most of the fuel is burned in suspension, the heavier mass falls on the grate. If the system has a moving grate the ash is removed on a continuous basis and therefore the chances of clinker formation are lower. Combustion condition not very much disturbed with 4–5 % increase in moisture. - 16 - It is similar to stoker combustion, but since the fuel size is small and even, the combustion efficiency is improved as maximum amount of fuel is combusted during suspension. Same as stoker combustion. Best combustion takes place in comparison with the other types since the fuel particles are in fluidized state and there is adequate mixing of fuel and air. It can handle fuels with high moisture condition up to 45–50% but high moisture in the fuels is not desirable, and adequate precautions should be taken in the design stage itself. (Continue to next page)
( ... Continued) Draft Conditions Biomass Preparation, Storage, Handing, and Conversion Technologies Natural draft / forced draft/ balanced draft Maintenance Not many maintenance problems. Forced draft / balanced draft Frequent problems due to movement of grate. - 17 - Balanced draft Variation in fines in fuel leads to delayed combustion thereby affecting the boiler tubes. Balanced draft Erosion of boiler tubes embedded in the bed is quite frequent.
Page 1: From: Biomass as Fuel in Small Boil
Page 5 and 6: CONTENTS List of Tables v List of F
Page 7 and 8: LIST OF TABLES 1-1 Residue from maj
Page 9 and 10: 1. INTRODUCTION TO BIOMASS AS FUEL
Page 11 and 12: - 3 - Introduction to Biomass as Fu
Page 13 and 14: Figure 1-3 Various biomass energy s
Page 15 and 16: 2. BIOMASS PREPARATION, STORAGE, HA
Page 17 and 18: Biomass Preparation, Storage, Handi
Page 23: Biomass Preparation, Storage, Handi
Page 27 and 28: Biomass-based Fluidized Bed Combust
Page 37 and 38: - 29 - Performance Evaluation of Bi
Page 39 and 40: i. Percentage heat lost due to dry
Page 41 and 42: Solution: Step 1) Find the theoreti
Page 43 and 44: 5. RETROFITTING OF COAL-/OIL-FIRED
Page 45 and 46: Retrofitting of Coal-/Oil-Fired Boi
Page 47 and 48: Retrofitting of Coal-/Oil-Fired Boi
Page 49 and 50: 3. Close drain cock 4. Close steam
Page 51 and 52: ( ... Continued) Air leaks on water

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