Water treatment equipment for the power industry of Hangzhou Yongjieda Purification Technology Co., Ltd.
Water quality standards for the electric boiler industry
Comply with national or industry boiler water supply standards (GB1576-2001 , DL/T561-95), suitable for medium and high pressure boiler water replenishment water quality requirements. (Ultra)pure water with a resistivity of 0.5-10MΩ.cm.
Ultra-high pressure boiler water quality requirements
Controlling the water quality of boiler feed water is mainly to prevent boiler scaling, corrosion and salt accumulation. Usually low-pressure boilers use softened water as feed water, and medium-pressure boilers use softened water as feed water. Dealkalization and demineralized water are used as feed water, while high-pressure boilers must use demineralized water as feed water.
Typical preparation process of softened water in the electric power boiler industry
1. Source water (tank) → source water pressure pump → mechanical filter → activated carbon filter → reverse osmosis → electrodeionization (EDI)
2. Source water (tank)→source water pressure pump→mechanical filter→activated carbon filter→reverse osmosis equipment
3. Source water (tank)→ Source water pressure pump → mechanical filter → activated carbon filter → reverse osmosis → ion exchange desalination
4. Source water (tank) → source water pressure pump → mechanical filter → activated carbon filter → Cation exchange softening
In actual work, appropriate choices or combinations are made based on the source water quality and effluent requirements to determine the process!
Water quality standards and anti-scaling measures for hot water boilers in water treatment equipment in the electric power industry
●For boilers with hot water temperature ≤95℃ and rated power ≤2.8mw, in-pot anti-scaling measures can be taken Dirt treatment. The feed water requirements for this type of boiler are suspended solids ≤ 20 mg/l, pH ≥ 7, and oil content ≤ 2 mg/l. The pH requirement of boiler circulating water is to reach 10-12. Since this kind of boiler replenishes the evaporation and concentration of water, it must rely on adding alkalizing agent to increase the pH to prevent scaling.
●Boiler feed water with hot water temperature ≥95℃ requires suspended solids ≤5mg/l, total hardness ≤0.3mmol/l ph≥7, dissolved oxygen ≤0.1mg/l, and oil content ≤2mg /l. The boiler circulating water is required to have a pH of 10-12 and a dissolved oxygen of ≤0.1 mg/l. The supply water must be treated and deoxygenated to be qualified.