Welcome To Meacon Automation Co.,Ltd
Automation equipment mainly relies on computer technology and Internet technology to reform and innovate the equipment intelligently to achieve the purpose of automated production. At present, automation equipment is gradually becoming popular in various fields, which has greatly improved the quality and efficiency of industrial production. This also shows that the application of automation instruments to the field of chemical production control has the following significance: firstly, the field of chemical production develops towards automation, which greatly liberates manpower. Secondly, the control of temperature, pressure, flow rate, and material height in the process of chemical production guarantees the quality of production; finally, the staff can get the production parameters in real-time, which facilitates the adjustment of abnormal data and improves the production efficiency.
Since many chemical production processes are carried out under high temperatures and pressure, the temperature of each link of chemical production should be strictly controlled to ensure that the temperature is always kept within the normal range to avoid accidents and improve the effect of chemical production. This determines that the chemical production control process must use temperature instruments.
The traditional mode of temperature measurement is based on a mercury thermometer, because the upper and lower limits of a mercury thermometer are relatively low, only suitable for application in the field of chemical production control of low temperature and little change, and can not adapt to most of the high temperature, high-pressure chemical production environment, so the use of automated temperature instrumentation. Automated temperature instruments can be divided into two categories: contact and non-contact, which are not only simple and reliable to apply, but also have high measurement accuracy and can adapt to most high-temperature and high-pressure chemical production processes. Its main principle is to use the internal high-temperature resistant metal thermometer, through the resistance, thermocouple, and other instruments for temperature measurement, and through the instrument panel to display the temperature data in real-time; staff can adjust the temperature parameters of the chemical production process temperature control, to achieve the precise control of chemical production temperature, effectively improve the quality and efficiency of production.
Pressure instrumentation refers to the instrumentation that measures the pressure in the working area above the ambient pressure with the elastic element as the core component, which has an important influence on the chemical production control process together with temperature instrumentation and is widely used in various fields. Common pressure instruments are shown in the figure.
As most chemical products must be in a pressure environment different from atmospheric pressure, in order to protect the quality of chemical production, the air pressure must be reasonably controlled. Pressure instruments are mainly divided into field indication type pressure instruments and remote pressure transmitters. Field indication class, such as ordinary pressure gauge, oxygen pressure gauge, piston type pressure gauge, pressure transmitter, differential pressure transmitter, absolute pressure transmitter, etc. In the selection of pressure instruments, the selection should be made according to the specific chemical production, which requires comprehensive consideration of the heat resistance, corrosion resistance, pressure threshold, and other factors of pressure instruments. The pressure instrument mainly works by the internal sensitive element: when measuring the air pressure in the measuring area, the gas or liquid will give a force to the sensitive element, and through reasonable conversion, the pressure instrument will convert this force into the pressure value of the corresponding value, and display it on the instrument panel or remote transmission to the control room for display.
The term level instrumentation refers to industrial automation instruments that measure the height of powder granular bins or the liquid level height of liquids, and the accurate measurement of level is also crucial in the chemical production process. Common level meters are shown below.
When the level measurement is used, usually in closed or open vessels, there are generally two types of measurement: continuous measurement and limit measurement. Continuous measurement refers to the real-time uninterrupted measurement of the material height in the same chemical production process; limit measurement refers to the measurement of whether the material height reaches a certain requirement, both of which are mainly for measuring liquid materials. Level meter mainly includes differential pressure level meter, magnetic float level meter, radar level meter, ultrasonic level meter, and external paste level meter. For example, the float level meter mainly uses the magnetic float to measure: when the float is not in contact with other materials, it will slowly fall; when the float touches the liquid surface, it will stop falling, and then the meter will measure the corresponding material height according to the distance the float falls, and present the result on the instrument panel or send it to the control system as a 4-20 mADC signal to monitor the material height of the production process in real-time. Monitoring, to ensure that the material height is always within a reasonable range, but also can be accurate in the chemical production of material quality and volume, when the material is not enough will give timely feedback to the personnel to do the corresponding, to ensure the stability of chemical production.
In the process of chemical production, it is inseparable from liquid or gas flow detection, but the measurement of flow is an extremely complex work, affected by a variety of factors, in order to improve the efficiency and accuracy of flow measurement work, flow meters are widely used in the field of chemical production. Common flow meters are shown in the figure.
Usually, the flow meter is divided into two categories of liquid flow meter and gas flow meter, specific subdivisions can be divided into differential pressure flow meter, rotor flow meter, vortex flow meter, electromagnetic flow meter, ultrasonic flow meter, Coriolis force mass flow meter, etc. Its working principle is divided into mechanical principle, electrical principle, acoustic principle, etc., mechanical principle as an example: the Coriolis force mass flow meter, is mainly based on the Coriolis force principle, when the fluid through the pipe is, will produce a force on the pipe wall, by detecting the force and converted to frequency, you can detect the quality of the fluid, mass flow meter with high accuracy, usually used for trade settlement. In the selection of flow meters, should be selected according to the type of chemical production, the need to consider the flow meter heat resistance, pressure resistance, corrosion resistance, and other factors; in addition, because there will be a certain pressure loss in the measurement of fluid flow, manufacturing companies should further optimize the measurement of flow meters, as far as possible to reduce the impact of pressure loss on data accuracy.
Automation instrumentation in all walks of life to maintain a greater advantage, its application in chemical production control, in the form of temperature instrumentation, pressure instrumentation, level instrumentation, and flow instrumentation four, effectively improves the quality and efficiency of chemical production; in the long run, automation instrumentation gradually tends to intelligent, networked, virtualized, to further improve the degree of automation at the same time, the accuracy of measurement and work efficiency has been improved In the long run, the automation instrument gradually becomes intelligent, networked and virtualized, further improving the degree of automation while the accuracy and efficiency of measurement are improved.
