Application of Mass Flow Meter in Liquid Chlorine Filling and Metering

Abstract: The application information of mass flow meter in liquid chlorine filling and measurement is provided by excellent flow meter and flow meter manufacturers and quotation manufacturers. Abstract As we all know, the filling of liquid chlorine is a complicated process. Due to the special physical and chemical properties of liquid chlorine, the measurement accuracy of its filling flow is not high, which is also a prominent problem in the field of flow measurement. This article combines over the years. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the application article details of mass flowmeters in liquid chlorine filling and measurement. Abstract As we all know, the filling of liquid chlorine is a complicated process. Due to the special physical and chemical properties of liquid chlorine, the measurement accuracy of its filling flow is not high, which is also a prominent problem in the field of flow measurement. Based on the experience and lessons of using mass flowmeters in the process of liquid chlorine filling and measurement over the years, this paper puts forward some suggestions for the measurement of liquid chlorine filling for reference by peers. Keywords Liquid chlorine filling and metering, mass flowmeter The HC series Coriolis mass flowmeters produced by our company have been used in the liquid chlorine filling and metering process in some chlor-alkali industries in five provinces and regions in China since 2011. The experience in use is now introduced as follows, for the reference of the same industry and the majority of users: 1. The significance of flow measurement during the filling process of liquid chlorine Liquid chlorine is a yellow-green transparent liquid, and its composition is Cl2>96% (vol), H2O<0.015% (wt). The relative density is 1.468 (0°C), the boiling point is -34.5°C, the melting point is -100.98°C, and the molecular weight is 70.91. It is vaporized into gas under normal pressure, and 300L of gaseous chlorine (dry chlorine gas) can be obtained after 1kg of liquid chlorine is vaporized. It has a suffocating odor, strong irritating odor and corrosiveness. The filling factor of any liquid chlorine container shall not exceed 80%. Because the temperature of liquid chlorine when it starts to enter the container is low, for example, at 38°C, its pressure is 1.0Mpa.g. If the liquid chlorine is in a static state, because the liquid chlorine will continuously absorb the heat in the outside air, the temperature will rise, and the vaporization will cause the volume expansion; if the liquid chlorine is filled in the container, there is no free space to allow it to expand, and the liquid will again It has incompressible properties. At this time, the liquid chlorine will generate a huge pressure as the temperature rises, causing the container to burst. If the liquid chlorine container is full and cannot expand freely, when the temperature rises to 50°C, the pressure can reach 50Mpa.g. This will greatly exceed the allowable pressure that ordinary pressure vessels can withstand. The filling factor of liquid chlorine cylinders is also strictly prohibited to exceed 80%, and the design temperature of the liquid chlorine tanker is 50"C. There is a phase change when the liquid chlorine tanker is filled, which is an endothermic process. Generally, the filling temperature is lower than room temperature. After filling. The temperature of the tanker rises slowly, and the percentage of the volume of liquid chlorine in the tanker increases accordingly. The gas phase space becomes smaller. If overfilled. The increase of temperature will lead to the increase of pressure, and the increase of internal pressure will not be the law of increase of saturated vapor pressure. If the pressure is too high, the tank body of the tanker has the danger of explosion. In my country, there are strict regulations on liquid chlorine containers and their filling, and departments such as police, fire protection, safety supervision and other departments carry out strict supervision and inspection on the transportation link, and the punishment for overfilling is quite severe. For this reason, real-time supervision should be carried out during the filling of liquid chlorine to prevent overfilling. Once overfilling is found during weighing, the manpower, material resources and financial resources required for punishment and unloading will be greatly lost. It can be seen that the metering in the liquid chlorine filling process is very important. 2. Error analysis during the filling process of the liquid chlorine tanker 2.1 Errors of the filling device of the liquid chlorine tanker So far, the flow meter is only used on the filling device of the liquid chlorine tanker. However, the processing and production of the tanker filling device is basically completed by the user himself. Therefore, the design and selection of the structure, control part and valve of each user's filling device, and the installation position of the flowmeter are also different. Although the measurement accuracy of the flowmeter is higher. However, the measurement error caused by the above reasons is far greater than the error of the flowmeter itself. For example, because the valves selected by users are pneumatic, electric, and manual. When the filling starts, if the valve is opened too fast, the pressure of the liquid chlorine in front of the valve will drop sharply, resulting in the gasification of liquid chlorine. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection of our manufacturer, quotations, etc. 'Application of Mass Flow Meter in Liquid Chlorine Filling and Measurement'
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