How to remove boiler scale

1. Mechanical descaling method: When there is loose scale and slag in the cast iron hot water boiler, cool the cast iron hot water boiler and discharge the boiler water after stopping the boiler. After washing with clear water, scale can be removed by flat shovel, wire brush and electric pipe milling machine. This method is simple, often used in small cast iron hot water boilers, and the scaling is simple. However, due to the high labor intensity and poor descaling effect, it is easy to damage the furnace body.

2. Pickling descaling method: Pickling descaling method mostly uses hydrochloric acid or nitric acid for cleaning. The pickling solution consists of hydrochloric acid and corrosion inhibitor or nitric acid and corrosion inhibitor. This pickling solution can not only remove the scale in the boiler (hydrofluoric acid should be added when removing the scale of nitrate water), but also has little corrosion to cast iron hot water boilers. Acid cleaning and rust removal have the functions of dissolution, stripping and loosening.

3. Alkali boiling descaling method: The descaling effect of alkali boiling descaling method is worse than that of pickling descaling method, but the scale after alkali boiling is loose, and the scale that is difficult to remove with hydrochloric acid can also be treated with alkali boiling method before pickling. The alkali cooking method is simple in operation and has few side effects. Disadvantages are long cooking time, large chemical consumption and poor effect.

Extended data;

1, pressure gauge, water level gauge, safety valve, blowdown device, water supply valve, steam valve, etc. , check whether its performance meets the requirements and whether other valves are in good condition.

2, automatic control system, including flame detector, water level, water temperature detection, alarm device, various interlocking devices, display control system and other performance status is in line with the requirements.

3 water supply system, including water level of water storage tank, water supply temperature, water treatment equipment and other conditions are symbolic requirements.

4, fuel combustion system, including fuel reserves, power lines, combustion equipment, ignition equipment, oil cut-off device, oil pump and other conditions are in line with the requirements.

5, ventilation system, including fan, induced draft fan, regulating valve, gate, ventilation pipe open well.

During the use of the boiler, the water temperature and water level probes should be cleaned regularly, and the scale should be removed regularly. The water outlet, outlet pipe and nozzle of the boiler body should be dredged regularly, and sewage should be discharged at least once a day.