Boiler Water

Product Classification

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Product Application

1．Quality requirements for boiler water supply

Qualified water supply is the prerequisite for safe, economic, reliable and stable operation of boiler and for generating qualified steam and hot water.

Poor water supply for boilers will lead to incrustation, damaged heated metal due to high temperature, heat efficient reduction, increasing chemical cleaning and corrosion of boiler metal. In addition, excessive salt content in boiler water will cause aerated water azeotropy and thus deterioration of steam quality.

2．1 Scheme of water softening or water soda removing and softening

2.1.1 Softening by cation exchange

Pretreatment → sodium-type strong acid cation exchange→ thermal deaeration

Ensure the residual hardness of water at 0.03mmo1/L without reducing basicity of water. It can be used for low-pressure boiler water supply.

2.1.2 Softening and removing soda by cation exchange

Pretreatment →hydrogen-type cation exchange →sodium-type strong acid cation exchange→ thermal deaeration

Advantage: reducing hardness of water as well as reducing its basicity

2．2 Scheme of salt removing

2.2.1 Removing salt by compound ion exchange

Pretreatment →strong acid cation exchange→ carbon dioxide remover →sodium-type strong acid anion exchange→ thermal deaeration

Conductivity of discharged water can be less than 10μs/cm. Generally, it is applied to medium- and low-pressure boiler water supply.

Advantage: low one-time investment cost.

Disadvantage: large acid-base regenerant consumption during operation causes increasing cost and environment pollution.

2.2.2Desalting by RO

Raw water → mechanical filter → activated carbon → security filter → RO device →thermal deaeration

Desalting rate can reach over 98%. Applicable for medium- and low-pressure boiler water supply.

Advantage: removing various impurities from water, no use of acid-base regenerant during operation, low operation cost and no environment pollution, easy automatic control and reducing labor strength

Disadvantage: high one-time investment cost.

2.2.3 Double bed (or RO) + mixed bed desalting

Raw water → mechanical filter → activated carbon filter → security filter → RO device or double bed → mixed bed → thermal deaeration

Nealy compete desalting. Applicable for medium- and high-pressure boiler water supply.

Especially, desalting with RO device before mixed bed can greatly improve the operation cycle of the mixed bed. Also, as the RO device has removed various impurities in water, thus the mixed bed resin is protected, and its service life prolonged.

2.2.4 Flow of EDI method:

Raw water → raw water pressure pump → multi-medium filter →activated carbon filter → water softener → primary RO device → middle water tank → middle water pump → EDI system → microporous filter → user

Specification：

Name Model Flow rate (m3/h) In/outlet

FW59-001 ф350×1700 1 DN20

FW59-002 ф500×2000 2 DN25

FW59-003 ф600×2050 3 DN32

FW59-004 ф800×2600 5 DN40

FW59-005 ф1000×2700 8 DN50

FW59-006 ф1200×2800 10 DN50

FW59-007 ф1400×2850 15 DN50

FW59-008 ф1600×2950 20 DN65

FW59-009 ф1800×3050 25 DN80

FW59-010 ф2000×3150 30 DN80