The feed water ammonia plant is used in the thermal power system of the thermal power plant. By tracking the change of the water vapor quality of the thermal system, the dosing pump automatically adds the chemical solution ammonia into the boiler system to adjust the pH value of the boiler water, so that the system water vapor quality is in good working condition. To ensure the safe operation of the unit.
The ammonia dosing device is composed of a solution tank, a metering pump, a liquid level gauge, a safety valve, a pulsation damper, various valves, pipes, and an electric control cabinet. It can be controlled manually or locally. The automatic control is realized based on signals such as receiving flow rate, PH value, and conductivity of the frequency conversion device.
Function introduction of automatic control system: In the automatic control state, the system automatically adjusts the speed and stroke of the metering pump according to the flow, PH value and conductivity signal through PLC, host computer or DCS. The metering pump flow adjustment range is 0~100%. . The inverter's speed control input signal is a standard 4~2mA signal, and the feedback signal is also a 4~2mA signal. The status and fault signals of all metering pumps and agitators can be transmitted to the DCS or the host computer as needed. The DCS or the host computer can remotely start and stop the dosing pump as needed.
? According to different technical requirements, the electric control cabinet can be equipped with local manual control, semi-automatic control and fully automatic control.
? The solution tank can be made of 316 stainless steel or 304 stainless steel according to different corrosion resistance requirements.