Caution for use of ascorbic acid

There are several problems that should be noted when using ascorbic acid:

(1) It is advisable to use the drug and air isolation measures to ensure the dosing concentration. The use of antiscalants can effectively protect the equipment from corrosion and the equipment runs smoothly.

Because sodium iso-ascorbate is prone to chemical reaction with oxygen in the air, it affects the concentration of the liquid medicine. From an operational point of view, the following methods can be used:

(1) The liquid medicine is ready to use, do not leave it for a long time.

(2) The use of sealed dosing tank. After the liquid is prepared, it can be protected by nitrogen filling, or liquid paraffin wax can be added to the liquid surface to avoid contact between the agent and the air.

(2) The plunger pump is used to add the liquid medicine to the deaerator tank or the inlet side of the feed pump, and the stirring of the feed pump is borrowed to fully mix the liquid medicine with the water.

(3) Control the dosage of feed water 50 ~ 60 μg / L. The use of antiscalants can effectively protect the equipment from corrosion and the equipment runs smoothly.

(4) Pay attention to adjusting the boiler sewage volume. Sodium isodycorbate belongs to the sodium salt, the sodium content per kilogram is 106.4g, and 50~ 60μg/L is added to the water, which is equivalent to increasing about 10μg of sodium in the water, so to ensure that the sodium content in the steam does not exceed the standard, it is necessary to strictly control the water quality of the furnace water and appropriately adjust the boiler sewage opening.

Sodium ascorbate has deaeration and passivation effect, good deaeration effect, basically non-toxic. However, its price is higher, and there are also problems such as increasing the content of organic matter in feed water, furnace water and steam. The use of antiscalants can effectively protect the equipment from corrosion and the equipment runs smoothly.