Several kinds of flowmeter selection in the sulphuric acid system

Sulphuric acid HRS system works under the condition of a special process, the system demanding process indexes, set up multiple process equipment safety interlock protection system; To ensure the unit safe operation for a long period of time, high reliability requirements for field instruments. The system process has the characteristics of high temperature, strong corrosion medium, and the pipeline of large size, especially the system security of several important parameters: the level of absorption of acid concentration, level of absorption of acid flow and pump tank liquid level control is very important. 1 sulphuric acid system level to absorb acid flowmeter selection HRS contact acid material all adopt meng Merck to provide special materials. Level of absorption of acid flow meter design working temperature 197 ℃, medium for w ( H2SO4) 99. 5% of the concentrated sulfuric acid. 1. 1 take pressure differential pressure flowmeter flowmeter elements ( Special materials of high-temperature concentrated sulfuric acid) Direct contact with the media, with the increase of operation time, apply pressure components caused by fluid scour easily pressure difference deviate from the design scope, poor measurement accuracy, large amount of daily instrument operation maintenance and pipeline resistance increases, the differential pressure type flowmeter consume more acid pump power, don't run the economy for a long period of time, increase the energy consumption per unit of acid. 1. 2 electromagnetic flowmeter electromagnetic flowmeter lining insulation materials and excitation coil insulation can not measure is higher than 160 ℃ medium, the location, therefore, cannot choose electromagnetic flowmeter. 1. 3 ultrasonic flowmeter ultrasonic flowmeter is more than ten years along with the rapid development of integrated circuit technology began to application of a kind of non-contact instruments. By the ultrasonic transducer ( The probe) , electronic circuit, calculation of flow meter three parts & throughout; 。 Ultrasonic transducer ( The probe) Used for sending and receiving of ultrasonic, the propagation velocity of ultrasound in fluid unaffected by the flow velocity of the body, the principle of ultrasonic flowmeter is based on the fluid flow measurement. According to different detection methods, can be divided into velocity difference method, doppler method, wave 朿 migration method, noise and the relevant laws such as different types of ultrasonic flowmeter. Outer clamp type ultrasonic flowmeter is the installation outside the tube type ultrasonic flowmeter, due to its measuring probe and measurement medium not contact, so clip type ultrasonic flowmeter don't change the flow of the fluid, do not produce additional resistance, instrument installation and maintenance are not affect production line operation, so it is an ideal energy-saving flowmeter. Outer clamp type ultrasonic flowmeter flow measurement accuracy is almost not affected by measurement of body temperature, the influence of the parameters such as pressure, viscosity, density is especially suitable for application in measuring the corrosive, non electrical conductivity, radioactive and flammable and explosive medium flow. As a result, the level 1 HRS system in use in the absorption of acid flow measurement clamp type ultrasonic flowmeter is suitable for the working condition of ZUI preferred choice.

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