高压差高固调节阀内部流场分析及优化
发布时间：2019-07-08 16:43
【摘要】：高压差高固调节阀是煤炭液化装置中的关键设备,安装于高温高压分离器和高温中压分离器之间,起调节分离器液位高度和节流减压作用。由于该调节阀运行工况恶劣,使得调节阀存在严重的气蚀和磨损损伤,调节阀极易出现失效,已严重影响装置的正常运行。本课题根据调节阀的运行环境、结构及介质物性等参数,在基于计算机流体力学基础上,构建了高压差高固工况调节阀的数值求解模型,通过对模型进行数值计算求解,获取典型开度下调节阀空化场中流道内介质的压力、速度、液相分率和磨损率等参数的分布,运用数值模拟方式分析阀门失效原因,并与现场失效调节阀进行对比,验证数值模拟计算的可行性。针对阀芯、阀座等零件的气蚀和磨损问题,开展结构优化方案设计和材料表面硬化研究;运用数值模拟技术对两个结构优化方案进行数值模拟,对比数值模拟分析结果,最终选择方案一作为调节阀的结构优化方案;通过开展材料表面硬化工艺试验,对比激光熔覆、火焰重熔、超音速喷涂三种表面硬化工艺方法,从硬化方式对基材的要求、基材与熔覆层的结合方式、熔覆层的硬度、熔覆层的表面质量等多方面因素考虑,最终选择采用激光熔覆表面硬化工艺方法对调节阀零件熔覆Ni-WC粉末以提高其硬度。本文通过对调节阀结构和材料同时进行优化的创新方法,用于解决调节阀在高压差、高固工况下的失效问题,为最终实现延长高压差高固调节阀的使用寿命提供理论依据。
[Abstract]:The high-pressure differential high-solid regulating valve is the key equipment in the coal liquefaction plant, and is installed between the high-temperature and high-pressure separator and the high-temperature medium-pressure separator, so as to regulate the liquid level of the separator and the effect of throttling and pressure reduction. Because of the severe operating conditions of the regulating valve, the regulating valve has serious cavitation and wear damage, and the regulating valve is easy to fail, and the normal operation of the device has been seriously affected. according to the operating environment, structure and physical property of the regulating valve, the numerical solution model of the high-pressure difference high-solid working condition regulating valve is constructed on the basis of the fluid mechanics of the computer, and the numerical calculation and solution are carried out on the model, The distribution of pressure, velocity, liquid fraction and wear rate of the medium in the cavitation field of the regulating valve in the typical opening degree is obtained. The failure reason of the valve is analyzed by means of numerical simulation, and the feasibility of the numerical simulation is verified by comparing with the on-site failure regulating valve. According to the problems of cavitation and wear of the valve core, valve seat and other parts, the structure optimization scheme design and the material surface hardening research are carried out, and the numerical simulation of the two structural optimization schemes is carried out by using the numerical simulation technology, and the results of the numerical simulation analysis are compared. in that final selection scheme, an optimization scheme of the structure of the control valve is adopted; the requirement of the base material, the bonding mode of the base material and the cladding layer are compared by the surface hardening process test of the material, the comparison of the laser cladding, the flame remelting, the supersonic spray three surface hardening process method, the requirement of the substrate from the hardening mode, the bonding mode of the base material and the cladding layer, The hardness of the cladding and the surface quality of the cladding are taken into consideration, and the surface hardening process of the laser cladding is adopted to cladding the Ni-WC powder on the valve part to improve the hardness. In this paper, an innovative method for optimizing the structure and material of the regulating valve is proposed, which is used to solve the failure of the regulating valve under high pressure and high solid working conditions, and provides a theoretical basis for the final realization of the service life of the high-pressure differential high-solid regulating valve.
【学位授予单位】：兰州理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TQ529;TQ055.81
本文编号：2511730
[Abstract]:The high-pressure differential high-solid regulating valve is the key equipment in the coal liquefaction plant, and is installed between the high-temperature and high-pressure separator and the high-temperature medium-pressure separator, so as to regulate the liquid level of the separator and the effect of throttling and pressure reduction. Because of the severe operating conditions of the regulating valve, the regulating valve has serious cavitation and wear damage, and the regulating valve is easy to fail, and the normal operation of the device has been seriously affected. according to the operating environment, structure and physical property of the regulating valve, the numerical solution model of the high-pressure difference high-solid working condition regulating valve is constructed on the basis of the fluid mechanics of the computer, and the numerical calculation and solution are carried out on the model, The distribution of pressure, velocity, liquid fraction and wear rate of the medium in the cavitation field of the regulating valve in the typical opening degree is obtained. The failure reason of the valve is analyzed by means of numerical simulation, and the feasibility of the numerical simulation is verified by comparing with the on-site failure regulating valve. According to the problems of cavitation and wear of the valve core, valve seat and other parts, the structure optimization scheme design and the material surface hardening research are carried out, and the numerical simulation of the two structural optimization schemes is carried out by using the numerical simulation technology, and the results of the numerical simulation analysis are compared. in that final selection scheme, an optimization scheme of the structure of the control valve is adopted; the requirement of the base material, the bonding mode of the base material and the cladding layer are compared by the surface hardening process test of the material, the comparison of the laser cladding, the flame remelting, the supersonic spray three surface hardening process method, the requirement of the substrate from the hardening mode, the bonding mode of the base material and the cladding layer, The hardness of the cladding and the surface quality of the cladding are taken into consideration, and the surface hardening process of the laser cladding is adopted to cladding the Ni-WC powder on the valve part to improve the hardness. In this paper, an innovative method for optimizing the structure and material of the regulating valve is proposed, which is used to solve the failure of the regulating valve under high pressure and high solid working conditions, and provides a theoretical basis for the final realization of the service life of the high-pressure differential high-solid regulating valve.
【学位授予单位】：兰州理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TQ529;TQ055.81
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