冷庫制冷系統(tǒng)氨工質泄漏擴散與熱氨融霜液錘的研究
[Abstract]:Ammonia is an ideal refrigerant for refrigerants due to its special properties. About 80% of refrigerants in China use ammonia as refrigerant. However, ammonia has certain danger, the leakage of ammonia working fluid in refrigeration system of cold storage will cause production safety and food safety accidents, and even affect public safety. Improper operation can lead to a major leak. Therefore it is very necessary to study the process of ammonia leakage diffusion and hot ammonia defrosting in cold storage refrigeration system to find out the regularity so as to take the corresponding accident prevention and response measures reasonably quickly and in time. The research in this paper will play an important role in ensuring food safety and public safety in the process of urbanization in China, and will broaden and deepen the research connotation of cold storage safety and cold chain safety management, and promote the development of related disciplines and technologies. To provide theoretical basis for all levels of government decision-making. In this paper, first of all, the ammonia leakage accident in cold storage occurred in recent years is analyzed, the research history of dangerous gas leakage at home and abroad is analyzed, and the detection method of ammonia leakage is briefly introduced. This paper introduces and analyzes the principle of ammonia leakage diffusion and frost thawing fluid hammer in refrigeration system, different leakage source models, ammonia diffusion model and factors affecting the diffusion. Thirdly, the ammonia leakage model is established under the accident state. The process of ammonia leakage and diffusion in several typical thermal conditions of refrigeration process is simulated by using ANSYS software. Through the detection and analysis of refrigerating machine room in cold storage, the leakage equipment in refrigeration machine room is summarized. The distribution law of ammonia concentration in the machine room caused by trace leakage of components and under normal condition is given. Finally, the damage effect of hydraulic hammer is analyzed, and the program is compiled with Visual Basic to calculate the shortest pipe length of pipe rupture caused by hydraulic hammer. The stress model of pipeline under the action of hydraulic hammer is established by using ANSYS software, and the stress of pipeline is simulated and analyzed. The results show that the diffusion process after ammonia leakage in the simulated refrigeration system is consistent with the theory of leakage diffusion. The diffusion process after ammonia leakage in different thermal states is the result of the joint action of different state parameters. The design advice of the length of the return gas collecting pipe is put forward. The pipe with the length obtained by programming is in accord with the condition of the pipeline rupture through the simulated force analysis. Therefore, this paper has a certain guiding significance for the safe operation and maintenance of the ammonia cooling system in the ten cold storage.
【學位授予單位】:哈爾濱商業(yè)大學
【學位級別】:碩士
【學位授予年份】:2016
【分類號】:TB657
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