Advanced orifice flowmeter | Doppler flowmeter

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Will the measurement decrease during 1? Vortex flowmeter and orifice flowmeter.

These two types of flow meters do not reverse the flow of vortices. They measure the pulses generated by vortices in the outflow direction, and backflow does not generate vortices on that side.. 2-orifice plate (throttling device), reverse flow will generate reverse pressure difference, but the transmitter does not measure in reverse. For 0-10mA, the reverse phase carrier is also 04-20mA, and 4mA is also 0. In addition, the flow control device is directional and does not consider backflow. There are also flow display instruments and accumulation instruments, and there is no subtraction operation draft calculation. It wont decrease.

2. Basic knowledge of thermal control in thermal power plants

The basic knowledge of thermal control in thermal power plants can be summarized into four core parts: measuring instruments, control systems, protection logic, and system composition.

. 1. Commonly used thermal control instruments. Thermal control instruments are the "sensing and attacking officers" of the system, responsible for accurately measuring various process parameters. Temperature measurement: Thermocouples are used in high-temperature areas such as boiler furnaces and main steam pipelines, with a wide measurement range; Thermistors (such as Pt100) are more suitable for measuring medium and low temperatures (such as water supply and bearing temperature), with higher accuracy. Pressure measurement: Spring tube pressure gauge is used for on-site indication, which is intuitive and reliable; The pressure transmitter converts the pressure signal into standard electrical signals such as 4-20mA and transmits them rem Advanced orifice flowmeter

otely to the control system for monitoring and adjustment. Flow measurement: Differential pressure flowmeter (with orifice plate, nozzle and other throttling devices) is the mainstream method for measuring steam and feedwater flow in power plants; Electromagnetic flow meters are specifically used to measure the flow rate of conductive liquids (such as circulating water and chemical water). The core control strategy is the "brain" of the system, which calculates and outputs instructions based on the measured values. PID control: the most fundamental and widely used control algorithm. The proportional (P) stage responds quickly to deviations, the integral (I) stage eliminates static errors, and the derivative (D) stage predicts trends to improve dynamic performance. Widely used in control circuits such as steam drum water level and main steam temperature. Cascade control: an advanced control strategy consisting of a primary and secondary controller connected in series. The main controller processes the main controlled variable (such as steam drum water level), and its output serves as the set value for the auxiliary controller (such as feedwater flow controller). This structure can effectively suppress internal disturbances and greatly improve control quality, making it a standard solution for complex circuits such as superheated steam temperature. The thermal protection system is the "bottom line" to ensure the safety of the unit and automatically operates when parameters exceed limits or equipment failures occur. Its function is to quickly cut off equipment or shut down the furnace in dangerous working conditions (such as overpressure, overtemperature, overspeed), preventing accidents from escalating. Core protection inc

Advanced orifice flowmeter | Doppler flowmeter

Will the measurement decrease during 1? Vortex flowmeter and orifice flowmeter.

2. Basic knowledge of thermal control in thermal power plants

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