Dosing device is also called dosing system, which can be divided into three kinds of oilfield dosing device, boiler dosing device and water treatment dosing device. Today, the small mechanical compilation of branch machinery, we understand the working principle of the carbonate dosing device

The phosphate dosing device is used for directly adding chemicals to the boiler drum, so that the drum system works in a good state, prolongs the service life of the thermal equipment, and ensures the safe operation of the hot water equipment for a long time

It can run in two modes of manual and automatic. Automatic mode can be equipped with boiler sampling device, online phosphate analyzer, online PH instrument and touch screen PLC. The phosphate solution can be automatically added according to the content of phosphate or pH value

Working principle of phosphate dosing device

In boiler water calcium magnesium hardness, chemical reaction will occur in a high temperature environment, or crystallization, scale to produce insoluble, firmly attached on the heating surface of the boiler, the scale is a poor conductor of heat, will hinder the occurrence of heat conduction, boiler tube explosion, may be serious when also will induce and exacerbate metal chemical corrosion under the scale, very serious harm. Although the boiler condensate water, to undergo a rigorous softening, except salt treatment, but there is still a small amount of calcium, magnesium hardness in water, if not this part of hardness for processing, will be scaling a threat to the safe operation of the boiler at present, water and phosphate is the most proper treatment methods, the reaction is as follows:
10Ca2 6PO4 2OH ---Ca10 (OH) 2 (PO4) 6 (basic calcium phosphate)

Basic calcium phosphate is a kind of soft water slag, easy to remove with the boiler blowdown, and will not adhere to the pot become scale

Process flow of phosphate dosing device

Phosphate dosing device includes dissolved liquid metering system, feeding system, the four part of the security system and control system. The system includes: liquid dissolved solution tank, mixer, magnetic level gauge, drain valve and pipe valve; metering dosing system is the main metering pump, flow calibration column; safety the system includes: safety valve, check valve, pulse damper, Y type filter, needle valve, ball valve, drain valve, pressure gauge; control system includes: Online phosphate online instrument, PH instrument, automatic control cabinet. In the process of using solid phosphoric acid salt solution kits, then proportionally adding in addition to saline or condensed water stirring and dissolving, measured by the dosing system to the boiler drum, dosing can be controlled by manual mode, can also according to the control signal output of the host system, servo control, automatic dosing.