大型鸡舍机械通风浓温场的数值分析

发布时间：2018-05-06 22:28

本文选题：置换通风 + 通风量　；参考：《哈尔滨理工大学》2016年硕士论文

【摘要】：现代化大型鸡舍多采用高密度饲养,鸡舍内容易产生氨气等有害物质,鸡舍环境控制在鸡养殖中起着十分重要的作用。良好的鸡舍生存环境是鸡健康生长的前提条件,是提高鸡产品质量的重要保障。鸡对养殖环境(如:气流速度、温度和氨气浓度)的要求较高。因此对鸡舍环境的模拟研究是十分有必要的。本文旨在通过对气流速度、温度和氨气的浓度模拟分析,获得鸡舍内气流组织的变化规律。探讨鸡舍内运用通风管道的置换通风方式的气流组织分布的合理性。模拟研究了给定通风方案对鸡舍环境因素的影响,给出了鸡舍机械通风的优化设计方案。首先,建立鸡舍机械通风的物理模型和数学物理模型,运用Fluent软件对鸡舍机械通风的气流组织进行了数值模拟,计算得出鸡舍内气流速度、温度、氨气浓度的分布特点。采用通风管道鸡舍置换通风的气流速度分布,温度分布和氨气浓度分布较为不均匀,同时还有气旋产生,这些对鸡的舒适性都有一定的影响。模拟结果为进一步研究鸡舍机械通风的控制提供了数据和理论依据。其次,在稳态模拟的基础上,对于NH_3预混条件下的鸡舍机械通风进行了瞬态模拟,得到了不同时间段下鸡舍内NH_3浓度的变化特点。通过对鸡舍不同时间同一位置NH_3浓度变化趋势的对比分析,在鸡舍机械通风中,分时段进行机械通风可以随时动态的调节鸡舍内气流条件,达到节能的目的。最后,对鸡舍内机械通风进行了优化分析。通过对通风管道不同出风口数量和不同风量对鸡舍气流组织的影响进行利弊分析,分析鸡舍内稀释氨气浓度的设计方案。得出鸡舍整体通风设计的优化方案,使鸡更舒适的生长,提高鸡产品的质量,并且达到节能的目的,同时给生产经营者提供理论和技术上的支持。
[Abstract]:Modern large chicken coop is raised with high density, ammonia and other harmful substances are easily produced in chicken house, and environmental control of chicken house plays a very important role in chicken breeding. A good living environment is a prerequisite for healthy growth of chickens and an important guarantee to improve the quality of chicken products. Chickens have higher requirements for breeding environment (such as airflow velocity, temperature and ammonia concentration). Therefore, it is necessary to simulate the environment of chicken house. The purpose of this paper is to obtain the variation of airflow in chicken house by simulating and analyzing the airflow velocity, temperature and ammonia concentration. This paper discusses the rationality of the distribution of air flow in the displacement ventilation mode using ventilation ducts in chicken coop. The effect of given ventilation scheme on the environmental factors of chicken house was simulated and the optimal design scheme of mechanical ventilation for chicken house was given. Firstly, the physical model and mathematical physical model of mechanical ventilation of chicken house were established, and the distribution characteristics of airflow velocity, temperature and concentration of ammonia gas in chicken house were calculated by numerical simulation of the airflow distribution of mechanical ventilation in chicken house by using Fluent software. The airflow velocity distribution, temperature distribution and ammonia concentration distribution were uneven and cyclones were produced in the replacement ventilation of chicken house with ventilation ducts, which had a certain effect on the comfort of chickens. The simulation results provide data and theoretical basis for further study on the control of mechanical ventilation in chicken houses. Secondly, on the basis of steady state simulation, the transient simulation of mechanical ventilation of chicken house under NH_3 premixed condition was carried out, and the change characteristics of NH_3 concentration in chicken house at different time periods were obtained. By comparing and analyzing the change trend of NH_3 concentration in different time and same position of chicken house, the mechanical ventilation can adjust the airflow condition of chicken house dynamically at any time, and achieve the purpose of saving energy. Finally, the mechanical ventilation in the chicken house was optimized and analyzed. Based on the analysis of advantages and disadvantages of the influence of different air outlet quantity and different air volume on the airflow organization of chicken house, the design scheme of diluted ammonia concentration in chicken house was analyzed. The optimization scheme of the overall ventilation design of the chicken house is obtained to make the chicken grow more comfortably, to improve the quality of the chicken products, and to achieve the purpose of energy saving, and at the same time to provide theoretical and technical support to the producers and operators.
【学位授予单位】：哈尔滨理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：S831.45

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