摘要
为解决因连作障碍等引起的设施园艺中土壤病虫害防治问题,拟开发一种以脉动燃烧器为热动力源的土壤蒸汽消毒机。根据土壤蒸汽消毒机的最小蒸汽量为100 kg/h,确定脉动燃烧器的最小功率为28.2 kW。脉动燃烧器主要由燃烧室与喷管组成,采用长度为200、400、800、1000 mm的直喷管和800 mm的弯喷管,通过法兰拼接组合成不同长度的直喷管(600、800、1000、1400、1600、1800、2200、2600、2800、3000 mm)和弯喷管(800、1600 mm),研究不同喷管结构对脉动燃烧器启动性能、工作稳定性能等的影响。结果表明:喷管长度在800~2600 mm启动;工作频率与压力振幅呈线性关系,频率高,压力幅值大;同一长度直喷管的燃油消耗率、频率与压力振幅均大于弯喷管的,且油门开度2、3、4时弯喷管燃烧器压力振幅标准差小,具有更好的稳定性;喷管长度为1800 mm左右的直喷管脉动燃烧器性能最佳。故选择喷管长度为1800 mm的弯喷管脉动燃烧器作为土壤蒸汽消毒机蒸汽发生装置热源,既能保证脉动燃烧器的工作特性,又能促使蒸汽发生装置小型化。
To address the issue of soil pests and diseases in facility horticulture caused by continuous cropping obstacles and other factors,a soil steam sterilizer powered by a pulse combustor as a heat source was developed in this study.Based on the minimum steam requirement of 100 kg/h for the soil steam sterilizer,the minimum power of the pulse combustor was determined to be 28.2 kW.The pulse combustor mainly consists of a combustion chamber and a nozzle and used straight nozzles of 200,400,800,1000 mm,as well as an 800 mm bent nozzle.They could be combined via flanges into different lengths of straight nozzles(600,800,1000,1400,1600,1800,2200,2600,2800,3000 mm)and bent nozzles(800 and 1600 mm).The impact of different nozzle structures on the startup performance and operational stability of the pulse combustor was studied.The results showed that nozzles ranging from 800 to 2600 mm could be activated.Working frequency and pressure amplitude had a linear relationship and higher frequency correlates with higher pressure amplitude.For straight nozzles of the same length,the fuel consumption rate,frequency and pressure amplitude were higher than those of bent nozzles.Under throttle conditions 2,3,4,the standard deviation of the pressure amplitude for the bent nozzle combustor was smaller,suggesting its better stability.The straight nozzle pulse combustor with a nozzle length of around 1800 mm had the best performance.Therefore,selecting the bent nozzle pulse combustor with a nozzle length of 1800 mm as the heat source for the steam generation unit of the soil steam sterilizer could ensure the operational characteristics of the pulse combustor while also promoting miniaturization of the steam generation unit.
作者
张爱琪
许林云
金晶
武玉柱
樊凯华
ZHANG Aiqi;XU Linyun;JIN Jing;WU Yuzhu;FAN Kaihua(School of Mechanical and Electronic Engineering,Nanjing Forestry University,Nanjing,Jiangsu 210037,China;Collaborative Innovation Center for Efficient Processing and Utilization of Forestry Resources,Nanjing Forestry University,Nanjing,Jiangsu 210037,China)
出处
《湖南农业大学学报（自然科学版）》
CAS
CSCD
北大核心
2024年第2期92-99,共8页
Journal of Hunan Agricultural University(Natural Sciences)
基金
江苏省现代农机装备与技术示范推广项目(NJ2020-19)。
关键词
脉动燃烧器
土壤蒸汽消毒机
喷管结构
工作稳定性能
启动特性
pulsating burner
soil steam steriliser
nozzle structure
operational stability performance
starting characteristics
