With its rich functions, the HZW-D axial displacement monitor plays an irreplaceable and important role in the operation management and safety assurance of rotating machinery and equipment such as steam turbines in power plants. Its functions include:

1. Measurement and display function

The HZW-D axial displacement monitor uses eddy current sensor technology for measurement. It can accurately measure the axial displacement of rotating machinery (such as steam turbines, etc.). For steam turbines, it can measure the position change of the rotor in the axial direction, and the measurement range is relatively wide. For example, when used with eddy current sensors of different specifications, it can measure axial displacements in a variety of different ranges such as -4.00-4.00mm.

In terms of display, a four-digit digital tube display is used, in which the highest bit is the sign bit, which can display values ​​such as “0″, “-”, “1″, “-1″, etc., and clearly and intuitively show the specific value of the current axial displacement to the operator.

2. Alarm setting function

The monitor has a flexible alarm setting function. The alarm value and shutdown value can be set arbitrarily through the panel buttons. For example, according to the specific operating requirements of the steam turbine, the first-level alarm value can be set to a value slightly larger than the axial displacement during normal operation. When the axial displacement reaches this value, the corresponding indicator light on the front panel will light up to remind the operator to pay attention to the operating status of the equipment.

The shutdown value is set more cautiously. When the second-level alarm value is exceeded or a more serious axial displacement is reached, the shutdown operation is triggered to protect the equipment. This alarm and shutdown setting can be adjusted arbitrarily within the measurement range, which is well adapted to the operating requirements of different equipment.

3. Protection function

It has multiple protection functions. When the axial displacement exceeds the set value, not only an alarm signal will be generated, but also a switch signal will be output on the rear panel to protect the monitored equipment. For example, for a steam turbine, if the axial displacement is too large, it may cause the rotor to collide with other components or damage the bearing. At this time, the protection output of the monitor can cut off the operation of the steam turbine in time to prevent further damage.

At the same time, it also has a disconnection detection protection function. When the sensor is disconnected, an alarm signal will be issued, the shutdown relay will be output, and the NOK light will light up, prompting the staff that the sensor is faulty.

4. Data output and compatibility function

The HZW-D axial displacement monitor is equipped with a current output interface. The current output range is 4-20mA and can drive a load of 500Ω. This feature allows it to be connected to systems such as computers, DCS (distributed control systems), and PLCs (programmable logic controllers).

After connecting to the control system of the power plant, the monitoring data can be transmitted to the computer in the central control room, which is convenient for staff to conduct centralized monitoring and management. Moreover, this data output method is also convenient for communication with other devices to achieve data sharing and integrated operation management.

5. Reliability function

The monitor has power-on and power-off detection functions. When power-on and power-off occur, the alarm and shutdown output circuits will be cut off at the same time, effectively suppressing the false alarms caused by the instrument due to such power state changes. In addition, there is also a good guarantee in the sensor offline detection, which can accurately identify the connection status of the sensor and further ensure the reliability of the monitoring system.

II. Application in power plants

1. Ensure the safe operation of steam turbines

In power plants, steam turbines are one of the core equipment. During the operation of the steam turbine, the axial displacement of the rotor may change due to the influence of various factors such as steam pressure and temperature. If the axial displacement is too large, for example, exceeding the limit range of normal operation (generally several millimeters), it may cause serious consequences.

HZW-D axial displacement monitor can monitor the axial displacement of the steam turbine in real time. When the steam turbine is started or stopped or the load changes, it can capture the value of the axial displacement in time. For example, during the turbine run-up process, as the steam enters, the axial force of the rotor will change. The monitor can ensure that the axial displacement is within this normal fluctuation range. Once it exceeds, it will immediately alarm and take protective measures to avoid collision between the rotor and the stationary parts, and protect the key parts of the steam turbine, such as blades, bearings, thrust bearings, etc. from damage.

2. Optimize operation management

Since it can be connected to the computer control system, the operation management personnel of the power plant can view parameters such as axial displacement in real time in the central control room. By analyzing a large amount of operation data, the operating parameters of the steam turbine can be optimized and the power generation efficiency can be improved.

For example, the operating status of the steam turbine can be adjusted according to different power generation load requirements to ensure that the axial displacement is always kept within the optimal range, reduce unnecessary wear of the equipment, extend the service life of the equipment, and reduce maintenance costs.

3. Fault warning and maintenance decision support

The regular alarm data of the HZW-D axial displacement monitor can provide a basis for the fault warning system of the power plant. When the axial displacement data fluctuates abnormally but has not reached the alarm value, this data can be used as a signal of early fault.

Maintenance personnel can conduct inspections and maintenance work in advance based on these data. For example, if the axial displacement may gradually increase due to bearing wear, then after the problem is discovered in the early stage, the bearing can be replaced to avoid more serious faults, thereby reducing the probability of power outages caused by equipment failures and improving the power supply reliability of the power plant.

4. Comply with power plant safety regulations

The safety regulations of power plants require strict monitoring and supervision of key equipment. The precise measurement and reliable protection functions provided by the HZW-D axial displacement monitor enable the power plant to meet relevant safety regulations and standards. In the safety assessment process of the power plant, this complete axial displacement monitoring system is also an important component, which helps to improve the overall safety level of the power plant.

When looking for high-quality, reliable displacement monitors, YOYIK is undoubtedly a choice worth considering. The company specializes in providing a variety of power equipment including steam turbine accessories, and has won wide acclaim for its high-quality products and services. For more information or inquiries, please contact the customer service below:

E-mail: sales@yoyik.com
Tel: +86-838-2226655
Whatsapp: +86-13618105229