共查询到18条相似文献,搜索用时 261 毫秒
1.
电子智能液位仪的安装改造 南阳石蜡精细化工厂共有 1 6个蜡罐 ,液位测量采用的是河北珠峰仪表厂生产的 ZYG- 1 0 1型电子智能液位仪 ,测量方法如图 1所示。液位仪主要由浮标、信息码带、连接钢带、导向滑轮、平衡重锤、变送器和二次仪表等构成 ,其各自功用为 :图 1 电子智能液位仪安装图1 .浮标的作用是直接把液位变化传给信息码带 ,使信息码带与液位同步运动。2 .信息码带是由不锈钢带制成的 ,量程最大可达到 32 767mm。码带上有格雷码编码的光孔 ,供变送器读取信息 ,并刻有十进制示值 ,可现场观测。3.连接钢带的作用是将浮标与信息… 相似文献
2.
本文介绍了乌石化公司炼油厂油品储罐液位检测及报警系统的完善,详述了ZYG-B301型智能液位仪、外贴超声波导波液位开关的安装调试方法及性能特点。 相似文献
3.
4.
液态危化品智能罐箱安装有液位计用于测量内容物液位以及倾角传感器用于测量箱体姿态。在智能罐箱实际使用中,存在液位测量值易受箱体倾斜姿态影响而导致虚假的液体泄漏警报问题。针对此问题,结合液位和倾角信息,借助于solidworks软件二次开发的功能实现了倾斜状态下罐箱参考液位的求解软件,给出了在一定倾角下仍能准确估计智能罐箱液体泄漏状态的方法。构建了一套模拟测试系统,通过实验验证了方法的正确性。 相似文献
5.
6.
利用超声波测距技术结合相应测试算法利用PC机进行群罐体容器内液位的测控和集中管理,可避免与被测液体接触,与采用压力式液位测试技术相比,不但大大增加了系统的连续工作时间,简化和方便了对传感器的维护,还可实现不停产检修,提高了生产率和管理水平。简述了系统的工作原理、组成结构和设计方法,并对传感器及微控制器的选用等内容进行了论述。采用单片机来控制超声波的发射与接收,并且计算出液位,使测试仪器具有更高的智能性。 相似文献
7.
为了保障化学品罐区安全运行,对外贴超声波液位开关在化学品罐区的使用现状进行了介绍,阐述了适合化学品罐区使用的新型外贴智能超声液位开关的特点与应用经验,探讨了未来新型智能外贴超声波液位开关的应用和发展前景,为化学品罐区的稳定运行提供了液位开关使用经验。 相似文献
8.
9.
10.
本文介绍了UBG型光导液位仪的结构原理及应用。现场运行表明,该液位仪具有工作性能稳定可靠,精确度高,安装和维护简单等优点,大大减轻了泵站操作人员的劳动强度,是目前比较经济实用的罐位检测仪表。 相似文献
11.
12.
基于PID算法液位控制系统的设计 总被引:1,自引:0,他引:1
液位控制是工业生产乃至日常生活中常见的控制,比如锅炉液位,水箱液位等。针对水箱液位控制系统,建立水箱模型并设计PID控制规律,利用Matlab仿真,整定PID参数,得出仿真曲线,得到整定参数,控制效果很好,实现了水箱液位的控制。 相似文献
13.
14.
三容系统是一种典型的非线性、时变、强耦合系统,它能较好地模拟非线性多容器流程系统,对其液位控制算法进行研究很有实际意义。该文以三容系统的液位为被控对象,把模糊控制技术应用于控制系统的设计中。利用Matlab软件中Simulink工具箱搭建系统,通过确定模糊规则和隶属度函数,来调节模糊控制器,使之有效地控制系统的液位。仿真结果表明:与传统PID控制算法相比,模糊控制算法是实现多容器流程系统控制的一种有效算法。 相似文献
15.
New approach to maintaining liquid flow rate stability in primary standard calibration facility is proposed. It takes advantage of primary standards with constant static head and does not require high-altitude installation of the pressure tank. To implement the proposed approach, the pressure tank is installed in the water pipeline of the Standard between the pumping station and the measurement pipeline. Pressure in the air cushion above the liquid in this tank is maintained automatically, as well as the liquid level in the pressure tank. It has been demonstrated that in order to stabilize the flow, it is sufficient to employ the controlling impacts in the form of air supply/withdrawal and adjustment of variable-frequency drives of pumps. The air is supplied and withdrawn from the air cushion by a set of critical flow nozzles, which are activated depending on the absolute pressure of air in the cushion. The liquid level in the tank is controlled by adjustment of variable-frequency drives of pumps based on the information on the hydrostatic head (liquid level) in the tank. Experimental study of the flow stabilization system of the National Primary Standard GET 63–2017 for mass and volume of liquid, mass and volumetric flow rates of liquid (Kazan, Russia) confirmed high efficiency of the proposed approach. 相似文献
16.
塔河炼化公司液体石油产品主要有3种外输方式:管道运输、公路运输及铁路运输,其中铁路运输量所占比例较大。将铁路罐车人工检尺计量数据与质量流量计数据进行比对,发现偏差率较大。本文通过研究影响液体石油产品铁路罐车计量误差的因素,以消除和减少计量误差,以确保贸易交接过程中企业的经济效益和客户利益,保证计量的准确性和公平性。 相似文献
17.
18.
《Measurement》2016
In this paper, an adaptive fuzzy control (AFC) system is proposed to realize level position control of two coupled water tanks, often encountered in practical process control. The fuzzy control system includes an adaptive model identifier and controller. The gains of AFC are obtained by using the fuzzy identifier model which is defined by real system outputs and control inputs. The parameters of fuzzy identifier model are adjusted online by using recursive least square algorithm. Because the controller has a recursive form it treats model uncertainties and external disturbances in an implicit way. Thus there is no need to specify uncertainty and disturbances for this controller design in advance. A well-tuned conventional proportional integral (PI) controller is also applied to the two coupled tank system for comparison with the AFC system. Experimentation of the coupled tank system is realized in two different configurations, namely configuration #1 and configuration #2 respectively. In configuration #1, the water level in the top tank is controlled by a pump. In configuration #2, the water level in the bottom tank is controlled by the water flow coming out of the top tank. Experimental results prove that the AFC shows better trajectory tracking performance than PI controller in that the plant transient responses to the desired output changes have shorter settling time and smaller magnitude overshot/undershoot. Robustness of the AFC with respect to water level variation and capability to eliminate external disturbances are also achieved. Experimental results show that AFC is a strong and a practical choice for liquid level control. 相似文献