In the modern energy landscape, 1000MW ultra-supercritical units have become the backbone of efficient and green power generation. However, higher power generation efficiency brings the challenge of extreme operating conditions: in the boiler's main feedwater and steam systems, static pressures often reach 35MPa or even 40MPa or higher.
Under such high pressure conditions, how can we accurately capture minute differential pressure signals to ensure the smooth operation of the boiler's "blood"-the water-steam system? This is not only about measurement accuracy but also directly related to the integrity and safety of the entire unit's pressure-bearing boundary.
This article will focus on how high static pressure transmitters play a crucial role in safeguarding this safety line.
The Cornerstone of Safety: Withstanding Extreme Operating Conditions and Ensuring the Integrity of Pressure Boundaries
In large power units, transmitters are not only measurement and control devices; their process connections are themselves part of the pressure-bearing boundary. Leaks in the power plant's high-pressure systems (such as boilers and main steam pipelines) directly threaten the safety of the unit. High static pressure transmitters are a crucial line of defense for early warning of such accidents. Therefore, the structural strength and sealing reliability of the transmitter are as important as its measurement performance.
**Rugged Structure, Withstands High Pressure Impacts:**
The main feedwater pressure of ultra-supercritical boiler units can reach over 40 MPa, and the main steam pressure can reach over 35 MPa. The sensing diaphragm, cavity, and process connections of high static pressure transmitters are specially designed to withstand system static pressures far exceeding their measurement range. For example, a differential pressure transmitter with a range of 0-100 kPa may need to withstand static pressures exceeding 40 MPa. This ensures that the instrument itself will not be damaged during normal system operation, as well as during pressure fluctuations, water hammer impacts, or abnormal pressure increases, and will continue to provide monitoring signals.
**Provides Reliable Signals for Critical Protection Systems:**
Safety systems such as the Boiler Furnace Safety Monitoring System (FSSS) and the Turbine Emergency Trip System (ETS) require absolutely reliable pressure signals as the basis for action. Due to their extremely high stability and reliability, high static pressure transmitters are frequently used in these Safety Instrumented Systems (SIS). The signals they provide (such as main steam pressure and drum pressure) are the core basis for determining whether equipment is in a safe state. Their failure probability is extremely low, making them the cornerstone of ensuring the safety of all personnel and equipment in the plant.
In ultra-supercritical power plants, one of the core values of high static pressure transmitters lies in safety assurance. With a highly reliable design, they are deeply embedded in the unit's pressure-bearing system, ensuring overall operational safety through their structural integrity. As a critical node for pressure monitoring and a protective barrier at high-pressure boundaries, they are an indispensable part of the power plant's safety system. Investing in high static pressure transmitters is essentially an investment in the inherent safety of the power plant.