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文丘里洗涤器净化生物质燃气流场数值模拟及试验研究
引用本文:常加富,董玉平,刘庆磊,郭飞强,张彤辉,张文康. 文丘里洗涤器净化生物质燃气流场数值模拟及试验研究[J]. 农业工程学报, 2012, 28(21): 186-192
作者姓名:常加富  董玉平  刘庆磊  郭飞强  张彤辉  张文康
作者单位:1. 山东大学高效洁净机械制造教育部重点实验室,济南250061
2. 山东百川同创能源有限公司,济南 250101
基金项目:国家科技支撑计划(2010BAC66B02,2011BAD15B05-05)
摘    要:针对文丘里洗涤器净化生物质气化燃气中的焦油液滴问题,借助CFD软件Fluent对文丘里管内部流场进行数值模拟,得出其压力与速度分布特性,从能量转化角度分析了文丘里除焦过程流场变化规律,结果表明文丘里喉管段压力大幅减小,其压力能转化为燃气流体动能,形成了较大的湍流提高净化效率。通过试验和数值模拟研究文丘里内部流场总体压力损耗,将液气比3L/m3、喉口气速70~120m/s条件下的文丘里管总体压力损失试验与模拟数据对比表明二者结果基本吻合。对文丘里净化生物质燃气除焦效率的研究表明喉口气速大于90m/s时,利用经验公式根据文丘里洗涤器实际总体压力损失可以有效估算除焦效率,误差范围在7%以内;喉口气速大于90m/s、液气比高于2L/m3时除焦效率可以达到90%以上。研究结果可以为文丘里洗涤器净化生物质燃气的工程应用提供参考。

关 键 词:生物质  焦油  净化  文丘里洗涤器  压力损失  除焦效率
收稿时间:2012-06-11
修稿时间:2012-09-28

Experimental study and numerical simulation on flow field of venturi scrubber purifying biomass gas
Chang Jiafu,Dong Yuping,Liu Qinglei,Guo Feiqiang,Zhang Tonghui and Zhang Wenkang. Experimental study and numerical simulation on flow field of venturi scrubber purifying biomass gas[J]. Transactions of the Chinese Society of Agricultural Engineering, 2012, 28(21): 186-192
Authors:Chang Jiafu  Dong Yuping  Liu Qinglei  Guo Feiqiang  Zhang Tonghui  Zhang Wenkang
Affiliation:1. School of Mechanical Engineering and Key Laboratory of High Efficiency and Clean Mechanical Manufacture, Ministry of Education, Shandong University, Ji’nan 250061, China; 2. Shandong Baichuan Tongchuang Energy Company Ltd, Ji’nan 250101, China)
Abstract:In order to settle the problem of tar droplets from biomass gasification gas by venturi scrubber, CFD software Fluent was employed to simulate the internal flow field in venturi tube. The static pressure field and axial velocity field inside venturi tube were obtained, and the variation of internal flow field was analyzed from the perspective of energy conversion. The results indicated that the pressure of throat pipe dropped significantly, and the static pressure energy was converted into kinetic energy so as to create larger turbulence, which improved purification efficiency. The total pressure drop and purification decoking efficiency of venturi scrubber were experimentally studied. The test results of total pressure drop of venturi scrubber were compared with simulated data, which showed that the test results matched well with simulation results when throat flow speed was between 70 and 120 m/s. The decoking efficiency could be effectively estimated using empirical formula based on the actual total pressure drop of venturi scrubber. Besides, the test data showed that decoking efficiency could reach to above 90% when throat speed was over 90 m/s and liquid-gas ratio was over 2 L/m3. The research laid a foundation for the application and expansion of venturi scrubber purifying biomass gas.
Keywords:biomass   tar   purification   venturi scrubber   pressure drop   decoking efficiency
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