摘要
集约型畜禽舍末端废气净化广泛采用酸洗喷淋的化学方法去除氨气和固体颗粒物。填料作为酸洗液与废气的反应场所,是影响废气净化效果的关键因素。针对畜禽养殖舍通风管理对废气净化系统净化效率及其产生的压降需求差异,该研究基于点阵结构优化方法,通过优化单胞构型研制了孔隙率可调的填料结构,并结合数值仿真和试验,分析了填料结构的孔隙率、压降和比表面积的变化规律及其对氨气和固体颗粒物(PM_(2.5)和PM_(10))净化效果的影响。研究结果表明:当填料结构孔隙率从98.7%降低至91.1%时,压降从2.7 Pa增至35.2 Pa,氨气净化效率从77.4%升高至92.6%,PM_(2.5)和PM_(10)的净化效率分别从69.2%和87.2%升高至90.1%和97.7%。相较于现有净化系统广泛应用的填料(孔隙率90%,压降30 Pa,氨气净化效率85%,悬浮颗粒物净化效率40%~45%),该研究设计的填料结构孔隙率可根据养殖舍通风系统的压降负荷要求在91.1%~98.7%区间内进行调节,且能够满足除氨效率83%~90%、颗粒物净化效率不低于50%的畜禽舍废气净化效率需求,为实现填料孔隙率自动调控提供了理论基础和设计参考。
Acid spraying has been widely applied to remove ammonia and particle matter in the exhaust gas purification at the end of intensive livestock and poultry houses.Package material can be expected to serve as the reaction site between acid solution and exhaust gas.The performance of package material can also dominate the effectiveness of exhaust gas purification in practical engineering applications.Particularly,the installation of an exhaust gas purification system is ever-increasing as the resistance of the ventilation system.The pressure drop generated by the packing material can determine whether the exhaust gas purification system can be configured.Since the porosity of packing material is often fixed,it is difficult to adjust for the different livestock and poultry houses.This study aims to fully meet the requirements of pressure drop and purification efficiency of the exhaust gas purification system in the ventilation management of livestock and poultry houses.A new structure was developed for the package material with adjustable porosity.The configuration of the base cell was also optimized in the package material,according to the lattice structure.A lattice structure was also designed with zero Poisson's ratio using a two-dimensional lattice cell optimization model,according to the topology optimization theory.The Parametric Level-set-based topology optimization was used to construct the optimization model.The optimized structure was then obtained under a randomly selected initial configuration using the iterative solution,indicating the zero Poisson's ratio.The parameterized configuration was constructed to maintain the optimized structural topology using homogeneous bars.A twodimensional lattice was constructed to form a three-dimensional one using the periodic arrangement of the two-dimensional parameterized configuration.A systematic analysis was implemented to determine the change in porosity,pressure drop and specific surface area of the package material using numerical simulation and experiments.The
作者
王昱
孙超
谭文超
易振峰
姚兴智
谢锦鹏
曾志雄
曾山
WANG Yu;SUN Chao;TAN Wenchao;YI Zhenfeng;YAO Xingzhi;XIE Jinpeng;ZENG Zhixiong;ZENG Shan(College of Engineering,South China Agricultural University,Guangzhou 510642,China;Key Laboratory of Key Technology of Agricultural Machinery and Equipment,Ministry of Education,South China Agricultural University,Guangzhou 510642,China)
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
2023年第19期195-202,共8页
Transactions of the Chinese Society of Agricultural Engineering
基金
国家自然科学基金项目(32372002)
2022年广东省农业农村厅智慧农场技术与装备集成应用模式与数字化展示项目
广东省乡村振兴战略专项资金专项(2023TS-3)。
关键词
填料
孔隙率
结构优化
废气净化
畜禽舍
packing material
porosity
structural optimization
exhaust gas purification
livestock and poultry house
