What are the common types of water level gauges used in steam boilers?

Steam boilers commonly used liquid level gauges, direct reading are: glass tube type, glass plate type, two-color water level gauge, etc. The instrument display is: electric contact type, float type, pressure type, etc.

In the operation of the steam boiler, when the water level in the boiler is higher than the normal water level, it is called the phenomenon of full water, at this time, the steam temperature will drop suddenly, and the steam will carry a large amount of water and the steam will hit and produce water hammer. When the water level in the pot is below the specified water level value, and the water level is still not seen by calling the water, it means that there is a serious shortage of water in the furnace. Therefore, the water level gauge is also an important accessory to ensure the safe operation of the steam boiler.

The water level gauges commonly used in steam boilers include glass tube water level gauge (Fig. 3-20a) and glass plate water level gauge (Fig. 3--20b).

The glass tube water level gauge is mainly composed of a steam, a water, a glass tube and a water discharge, and the glass plate water level gauge is mainly composed of a steam stopcock, a water stopcock, a glass plate, a metal frame box, a water discharge valve, etc. There is a triangular groove on the inner surface of the glass plate in the metal frame box, which can use the refraction of light in the groove, and the water line is clear and distinct.

The connection between the water level gauge and the pot tube is shown in Figure 3--21The water level of the pot drum is displayed on the water level gauge by means of a connecting tube. Each boiler should be equipped with a water level gauge on each side of the barrel for mutual correction and replacement.

1. Magnetic flap level gauge.

The structure of the magnetic flap level gauge is mainly designed and produced based on the principle of buoyancy and magnetic force. The position of the float with the magnet in the measured medium is affected by buoyancy. The change in liquid level leads to a change in the position of the magnetic float, and the hydrostatic and magnetic coupling of the magnetic float and the magnetic flap column (also known as the magnetic flap) causes the magnetic flap to flip at a certain angle (the surface of the magnetic flap column is coated with different colors), which in turn reflects the liquid level in the container.

2. Magnetic float level gauge.

The structure of the magnetic float level gauge is mainly designed and produced based on the principle of buoyancy and static magnetic field. The position of the float with a magnet (referred to as the float) in the measured medium is affected by buoyancy: a change in the liquid level leads to a change in the position of the magnetic float.

The magnets in the float and the sensors (reed switches.

The number of components (such as fixed-value resistors) connected in series into the circuit changes, and then the electrical quantity of the instrument circuit system changes.

3. Glass plate level gauge.

The glass plate level gauge is based on the communicator principle.

The liquid path designed by the glass plate and the main body of the liquid level gauge is connected with the measured container through the pipe flange or cone pipe thread to form a communicator, and the liquid level observed through the glass plate is the same as the liquid level in the container, that is, the liquid level height.

4. Heavy hammer detection liquid level cave bridge meter.

The hammer level gauge is designed and produced according to the principle of mechanical equilibrium. When the steel belt is immersed in the liquid and stationary at a certain position, the gravity of the float, wire rope (or steel belt), weight and pointer, the buoyancy of the liquid and the system friction force of the steel belt.

In equilibrium.

5. Ultrasonic level gauge.

Through one can emit energy waves (usually pulsed signals.

The device emits an energy wave, which is reflected by an obstacle and receives the reflected signal by a receiving device. According to the time difference in the process of measuring the movement of energy waves.

to determine the level change. The microwave signal is processed by an electronic device and finally converted into a level-dependent electrical signal.

Commonly used liquid level gauges, direct reading are: glass sail tung glass tube type, glass plate type, two-color water level gauge, etc. The instrument display is: electric contact type, float type, pressure type, etc.

The boiler water level gauge, based on the RF capacitance measurement technology of Tempatan Tank, outputs a continuous standard signal of 4-20mA for accurate measurement and control of the level of various boiler drums.

The boiler water level gauge draws on the advantages of the intelligent boiler drum level gauge, integrates high temperature resistance, high pressure resistance, corrosion resistance and anti-fluctuation performance, and uses military devices for the transmission part to make the signal output more stable and reliable. The level gauge is simple to install, small maintenance, accurate measurement and control, and cost-effective.

The water level in the boiler is displayed through the glass tubes. The center line of the glass tube should be concentric with the center line of the water level gauge steam and water to prevent the glass tube from breaking due to twisting stress.

In order to prevent the glass tube from bursting and injuring people, the water level gauge with the steel ball is equipped with a pin in the, and the impulse of the steam and water blasting makes the pin automatically close the steam and water.

If the protective cover is made of iron sheet, there should be a gap of 12 15mm wide on the front and rear cover walls in the direction of observing the water level, and its length should be no larger than the length of the glass tube. The gap in the back is to let the light in, and do not use ordinary glass as a protective cover, in case the glass tube is broken, but it will increase the danger.

Water level gauge is an indispensable component in water conservancy, petroleum, chemical industry, metallurgy, electric power and other fields. Although its land volume is relatively small, and the structure is very simple, it is an important safety guarantee for the operation of heating boilers. Every year, there are many major accidents such as industrial boilers and hot water boilers in the world due to water level gauges.

The heating boiler ensures the transportation of the oil depot, and the water level gauge ensures the safety of the boiler, which shows the importance of the water level gauge. The commonly used boiler water level gauges are as follows.

1. Water level gauge with muscovite sheet glass.

The glass plate water level gauge with muscovite sheet is one of the most used in China, the structure is relatively simple, and the observation is direct, but there are many shortcomings, such as not being able to use the chain cong adjustment equipment, and the transmission of water level signals is not possible, and there must be employees to observe the water level on the spot, which consumes more manpower; mica sheets also have to be imported, which is expensive (2000 3000 yuan kg); At the same time, it is very easy to leak, so it is gradually being phased out.

2. Quartz glass tubular water level gauge.

Compared with the previous water level gauge, this water level gauge has the following advantages; Long life (4500 5300h); High safety, can observe the water level (up to 300mm); The instructions are clear and obvious, and no light is required during the day; There is a protective device, and the soda is not easy to spray; It is easy to maintain and economical.

3. Magnetic flap water level gauge.

The magnetic flap water level gauge is suitable for liquid level indication in petroleum, chemical and other industrial fields, the liquid level gauge has a simple structure, intuitive and clear observation, no leakage, easy installation and simple maintenance. It is composed of the body, the flap box (composed of red and white two-color magnetic flaps), floats, flange covers, etc., which can be used for the detection of the medium level of various types of containers and boilers, etc., and is developed according to the principle of buoyancy and magnetic coupling, and the indication clarity is good, it is not easy to break, there is no blind spot in the measurement, the display degree is high, the measurement is wide, and it also has excellent reliability and corrosion resistance, and is suitable for use in the oil depot heating boiler.

They are connected to a tube called a glass tube.

In the operation of the steam boiler, when the water level in the boiler is higher than the normal water level, it is called the phenomenon of full water, and the steam temperature will drop suddenly, and the steam will carry a large amount of water and the steam will collide with the hall type to produce water hammer. When the water level in the pot is below the specified water level value, and the water level is still not seen by "calling water", it means that there is a serious shortage of water in the furnace. Therefore, the water level gauge is also an important accessory to ensure the safe operation of the steam boiler.

The water level gauge, also known as the liquid level gauge, is used to determine the level of the liquid.

The boiler water level gauge is also known as the water level gauge, and the working principle of the water level gauge is the principle of the communicator of the two vessels. The boiler tube is a large container, and the water level gauge is a small container, when the two are connected, the water level must be at the same height, so the water level height displayed on the water level gauge is the actual water level of the boiler tube.

At present, the level gauge used on the boiler has an electrode level gauge, a two-color automatic controller for the boiler, mica, a glass plate, a glass tube, a remote transmission, a differential pressure transmitter plus a balance vessel, an electric contact, and a special level gauge for the capacitive boiler steam drum, depending on what you want to use, I will send you a capacitor, and the boiler two-color, my surname is Gu.

Glass plates and reproductions. Generally, glass plates are selected.

Glass plate level gauge and magnetic flap level gauge are more commonly used, which can be selected according to working conditions.

Boiler, due to the high temperature and pressure, so the selection of level gauge must be cautious, moreover, the boiler is easy to produce gaseous, gaseous and liquid dividing line is difficult to distinguish, the measurement accuracy is not easy to grasp, we have a smart boiler drum level gauge, can accurately measure the stock of the boiler, and there is no false water level, can be tested on the spot!

Depending on the size and purpose of the boiler, at least 2 or 3 sets of level display systems are usually used, and the selection of level gauges is also different according to different requirements.

1. Direct liquid level display, the purpose is the most intuitive observation of the liquid level, commonly used plate level gauge, two-color liquid level gauge, magnetic flap level gauge on low-pressure small tonnage boiler is also commonly used;

2. Control the level gauge, used for automatic control signal, usually using the balance chamber and differential pressure transmitter, but also commonly used immersive float level gauge, this kind of level gauge requires the measurement principle to be directly related to the density of the medium, in order to avoid the influence of the boiler false level;

3. The safety level gauge mostly uses the electric contact water level gauge, which is characterized by indicating the liquid level point by point, each point is not related to each other, and the display of other points is not affected by the broken few points, and the reliability is extremely high.

Magnetic flap level gauge, glass tube level gauge.

ACD, boiler water level gauge, ship lock and communicator are all made by using the principle of communicator, so ACD does not conform to the theme of car dust;

b. The ink on the pen uses the principle of atmospheric pressure, which is in line with the closed theme of the sail

Therefore, choose b to crack randomly.