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Experimental Study of Block in Condenser for Biomass Pyrolysis

Author: XuJin
Tutor: WeiXinLi；LiuHong
School: Zhengzhou University
Course: Chemical Process Equipment
Keywords: Biomass pyrolysis Substances of block Influencing factor Designing equipment Optimization
CLC: TK6
Type: Master's thesis
Year: 2009
Downloads: 58
Quote: 0
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Abstract


This paper mainly research the problem of block happened in the condensation system of biomass pyrolysis equipments. The heat exchanger, based on the results above, had been designed for new structure and optimize by the CFD code fluent. The following introductions are the main research results.1. Via GC and GC/MS, to analysis the composition and quality rate of bio-oil and substances of block. The main aim is to find out the vital substance what causes the block.2. The principle of block in condensers is that pyrolysis gas carry with a great amount of char to flow into the condensers and the mixture form the gas dispersoid and liquid-soild dispersoid usually called small particles fouling of condensers. With the increasing volume of fouling, it finally causes the block of tubes.3. The main influencing factors of fouling are the temperature of pyrolysis and the degree of separation of gas and char by cyclones. When the pyrolysis temperature had been controlled in the range of 500 and 520℃, the forming of fouling had been suppressed better.4. Installing the second level of cyclone, it can make the better separation of gas and char than before. The new structure of the heat exchanger had been designed. The structure of new heat exchanger consists of floating head condenser, U-tube as the inner tube of heat exchanger and the jacket outside cyclinder. The structure of heat exchanger might be optimized via stimulation of fluid flow by CFD code Fluent. After the installing and adjustment for new heat exchanger, the anticipated aim of releasing block had been accomplished.

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