Feasibility analysis of magnetic flap level gauges used in thermal power plants

In the industrial production site of thermal power plants, common drum water level monitoring instruments generally include mica two-color water level gauges, magnetic flap level gauges, electric contact water level gauges, differential pressure water level gauges, etc. According to our market survey, the current use of various water level gauges has its own characteristics. Among them, mica two-color water level gauges, electric contact water level gauges and differential pressure water level gauges are early products. Magnetic flap level gauges were put into industrial production earlier and have a wider range of uses. Everyone is familiar with them. The application of magnetic flap level gauges in drum water level monitoring has only begun to rise in recent years. Because the magnetic flap level gauge has a unique measurement principle and structural characteristics, it has incomparable advantages compared with other water level gauges.
 
At present, the production and technology of magnetic flap level gauges have become increasingly mature. It can not only be applied to high-temperature and high-pressure drums, but also gradually promoted and applied in the level measurement of deaerators, condensers, high and low pressure heaters, drain tanks, water tanks, oil tanks, acid and alkali storage devices.
 
First, let's briefly describe the composition and advantages of magnetic flap level gauges. Magnetic flap level gauges
 
Magnetic flap level gauges are mainly composed of a cylinder, a float, a display device, and other parts. The main part of the measuring cylinder is made of 1Cr18Ni9Ti stainless steel. The display device is made of an aluminum alloy profile bracket and a red and green ceramic rotor.
 
Magnetic flap level gauge In recent years, the more advanced magnetic flap level gauge is the B69-16~32/2-CF series photoelectric two-color magnetic flap level gauge. The photoelectric level gauge is the same as the ordinary magnetic flap level gauge, and is also composed of a cylinder, a float, a display device, a sampling tube component, and other parts. The difference is that the display device of the photoelectric display level gauge is made of 1Cr18Ni9Ti stainless steel and a red and green two-color LED light-emitting tube. For example, the RZ-UHZCM magnetic sensitive two-color level gauge produced by Runzhong Instrument Technology Co., Ltd. belongs to this type. The main features and advantages of this product are as follows:
 
1. The photoelectric display is composed of imported dual-color ultra-bright LED lights. The LED lights of the magnetic flap level gauge support hot-swap connection, which is convenient for replacement of spare parts and maintenance.
 
2. The display shows the liquid level in red for gas and green for water. When the liquid level rises, the LED light-emitting tube displays green, and when the liquid level drops, it displays red. According to the red and green positions of the light-emitting tube, the specific value of the liquid level can be directly read from the scale.
 
3. The red and green dual-color LED lights have pure colors, and the display is clear and eye-catching. As a light source, the red and green LED lights are different from ordinary magnetic flaps or magnetic rotating columns, especially in TV monitoring, and have effects that other magnetic flap level gauges cannot achieve. The displayed red and green colors are bright and pure, which is different from the whitish display of general products on TV. It achieves clear consistency between the local and TV displays, which is suitable for user needs. Moreover, users can freely adjust the brightness over a large range on site without being affected by the on-site environment.
 
The main components of the magnetic flap level gauge products include the following: 1. Drain pipe; 2. Magnetic flap level gauge float; 3. Magnetic flap level gauge metal hose; 4. Magnetic flap level gauge 1/2" pipe threaded joint; 5. Cylinder; 6. Sampling tube; 7. Photoelectric display; Magnetic flap level gauge 8. Power box
　
Secondly, the magnetic flap level gauge has very strong reliability and measurement stability. Magnetic flap level gauge
 
Because the characteristic of the magnetic flap level gauge is that the measured medium and the display device are isolated from each other. Therefore, it is guaranteed to have good airtightness and safety and reliability, suitable for the measurement of different media such as high temperature, high pressure, toxic, harmful, and highly corrosive, and has a large measurement range, easy installation, intuitive reading, less maintenance, safe use, corrosion resistance, explosion-proof and other characteristics. These characteristics make the magnetic flap level gauge have stable operation, strong reliability, no leakage, liquid It has many advantages, such as clear position display, safe operation, no flushing, and no maintenance. In particular, the advantages of safe operation, no leakage, and no maintenance are unmatched by other water level gauges, and are very suitable for typical chemical industry enterprises. The use of this level gauge can not only improve the working environment and reduce the cost of use, but also improve the safety production coefficient and ensure the personal safety of relevant personnel.
 
About the types of magnetic flap level gauges
　
　According to the pressure level, there are three types of magnetic flap level gauges :
medium and low pressure magnetic flap level gauges: B49-1.6~6.4-CF/2/3, nominal pressure ≤6.4MPa
Secondary high pressure magnetic flap level gauge: B49-10-CF/2/3, nominal pressure ≤10Mpa
High pressure magnetic flap level gauge: B49-16~32-CF/3, nominal pressure ≤32Mpa
(Where /2 represents the type with liquid level switch, and /3 represents the remote sampling function).
High-pressure magnetic flap level gauges are mainly used on the boiler drum of power plants or in high-temperature and high-pressure containers with a similar operating environment to the drum.
 
The measuring cylinder of the high-pressure magnetic flap level gauge is made of high-quality stainless steel. The high-pressure float is made of high-strength, corrosion-resistant, and magnetic-insulating TC4 material, which has strong reliability and safety factor, and small thermal deformation at high temperature. Except for the connecting flange, the measuring cylinder has no other leakage points, and there is no need to frequently replace sealing and wearing parts like the mica two-color water level gauge. The connecting flange is sealed with a stainless steel graphite wound gasket or a stainless steel toothed gasket, so the water level gauge has good sealing performance and can be completely leak-free.
 
Taking into account the characteristics of high temperature and high pressure of the boiler drum, the production of the float is very important. Special technology and process methods are used. On the one hand, the magnetic steel uses rare earth samarium cobalt permanent magnet material, which has high remanence density, coercive force, maximum magnetic energy product and other indicators, and the high-temperature demagnetization curve is relatively flat. On the other hand, in order to improve the float's resistance to external pressure, the float is made in sections. Each float pipe section is made of TC4 bars with the best comprehensive performance in α+β phase titanium alloy. The pipe sections are connected by support rings made of TC4 bars, and the inside of each pipe section is also made of integrated support rings. The connection between the pipe sections is made of high-frequency plasma automatic welding, and the welds are beautiful and firm.
　
Summary of this article
In summary, in view of the current use status of power generation manufacturers, the liquid level gauge has the characteristics of safety, no leakage and maintenance-free. Therefore, the high-pressure magnetic flap liquid level gauge should be an ideal liquid level gauge for measuring high-temperature and high-pressure containers, especially boiler drum liquid level. Runzhong Instrument Technology is a company specializing in the production of magnetic flap level gauges. It has very strong advantages in the selection, installation, and maintenance of magnetic flaps. The companies it serves are also spread all over the country. Its products are all made of high-quality raw materials, with reliable quality and stable performance. It is the best choice for major power generation companies and chemical, pharmaceutical, environmental protection and other companies in measuring liquid levels.