Probe flowmeter

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1. What is a main steam flowmeter? A main steam flowmeter is a specialized instrument used to measure the flow rate of boiler main steam. Its core function is to accurately monitor the flow parameters of main steam, which plays a key role in ensuring the safe operation and economy of power plants. The following will explain from the aspects of definition, characteristics, types, and typical applications:

1. Definition and function of main steam flowmeter. Main steam flowmeter belongs to the subdivision type of steam flowmeter, which is specifically used to measure the main steam flow generated by boilers. Main steam is the core medium of the thermal cycle in power plants, and its flow data directly affects boiler combustion control, turbine efficiency calculation, and the balance of the entire thermal system. If the measurement is not accurate, it may cause the boiler operating parameters to deviate from the design values, leading to safety hazards (such as overpressure, overheating) or economic decline (such as fuel waste).

Secondly, the core feature of the main steam flowmeter is strong anti-interference ability: the main steam parameters (density, pressure, temperature, viscosity) fluctuate frequently, and the habitual flowmeter is easily affected.

. The main steam flowmeter, through optimized design (such as the metal chamber integrated structure of the intelligent probe flowmeter), is almost unaffected by the above parameters when measuring the volumetric flow rate under working conditions, ensuring the stability of data for tunnel sliding combustion. Extremely low pressure loss: The habitual orifice flowmeter has a large pressure loss due to its throttling structure, and long-term operation will reduce boiler efficiency and increase energy consumption. The new intelligent probe flowmeter adopts a needle design, with minimal pressure loss, which can significantly reduce energy loss. High precision and reliability: The accuracy can reach 0.2 level, meeting the strict requirements of power plants for flow measurement; No movable mechanical parts, reducing the risk of failure, requiring minimal maintenance, suitable for long-term continuous operation. Multi functional integration: Some models integrate temperature and pressure sensors, which can synchronously measure steam temperature and calculate pressure, and directly output the mass flow rate of saturated steam or the standard volume flow rate of gas, simplifying the measurement process.

III. Typical Types of Main Steam Flow Meter Orifice Flow Meter: Principle: By using a throttling device to generate pressure difference, the flow rate is calculated based on the relationship between pressure difference and flow rate.

. Limitations: High pressure loss (about 5% -10% of boiler pressure), long-term operation leads to energy waste; High processing accuracy is required, and installation and maintenance are cumbersome. Application scenario: Early measurement of main steam in power plants is gradually being replaced by new flow meters. Intelligent probe flowmeter: Principle: A needle probe is inserted into the main steam pipeline to calculate the flow rate by measuring the difference between fluid dynamic pressure and static pressure. Advantages: Extremely low pressure loss (close to zero); Integrated design of metal cavity enhances safety; High precision and adaptable to high temperature and high pressure environments. Application scenario: Contemporary pow

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