Acid dosing system

DAWT·2022-05-09

System Introduction

It mainly consists of solution tank, metering pump, electrical control cabinet, mixer, magnetic flap level gauge, safety valve, back pressure valve, flow calibration column, pulse damper, Y-type filter, online PH meter, ball valve, sewage valve , pressure gauge, pipeline and accessories, cables installed in the equipment, equipment base and support platform, etc. The solid or liquid medicine is added into the dissolving tank, and then tap water is added in proportion to stir and dissolve, and the metering pump is added to the adding point. The dosing control can be done manually or automatically according to the control signal output by the upper system.

How it works

1. Metering and dosing for the adjustment and treatment of boiler feed water in power plants (adding ammonia, adding hydrazine, adding deoxidizers), adding ammonia to feed water is to add 1-5% ammonia liquid (about 1-2 μm) to the feed water (or condensate) system. ;g/L) to neutralize free carbonic acid and increase the pH value of feed water to the specified range (8.5-9.3) to reduce the corrosion caused by carbonic acid and oxygen at low pH value. Adding hydrazine to feed water is to add an appropriate amount (20-50 g/L) of hydrazine (0.1-0.3%) to the water (or condensate) system for chemical deoxidation, and to maintain the reducibility of furnace water to prevent oxygen corrosion and deposition of metal oxides in the furnace.

2. Add water quality stabilizer or sulfuric acid to the circulating cooling water, add acid to the supplementary water of the circulating water system to reduce the alkalinity, convert the carbonate hardness in the supplementary water into non-carbonate hardness, and control the concentration of circulating water after concentration. The carbonate hardness is lower than the limit value to achieve the purpose of anti-scaling. Add stabilizer to increase the limit carbonate hardness of circulating water to prevent calcium carbonate scaling, and to avoid calcium sulfate scaling caused by simply adding acid to make the sulfate radical too high. Some stabilizers also have a corrosion inhibitory effect.

3. Add phosphate to boiler water (low parameter boiler eliminates residual hardness in feed water, high parameter boiler is used to adjust boiler water PH).

4. Add fungicides, coagulants, reducing agents, pH adjustment and other agents to the make-up water pretreatment system to eliminate microorganisms, organic matter, suspended solids and colloids in the raw water, oxidants in the water, and excessive acidity and alkali in the water. degree to ensure the need for advanced treatment of make-up water.

5. In the process of chemical cleaning, add the cleaning agent, corrosion inhibitor, accelerant and passivation agent to the cleaning solution and passivation solution.

6. Measurement of liquid materials added to petrochemical, chemical, food, beverage, and pharmaceutical processes.

7. Water treatment and wastewater treatment dosing and metering of regeneration liquid in ion exchange process.