Description

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A DM Plant (Demineralized Water Plant) in a thermal power plant is a water treatment system designed to produce high-purity water free from dissolved salts, minerals, and impurities. This purified water is mainly used as boiler feedwater for generating steam in power plant boilers and turbines.
High-pressure boilers used in thermal power plants require extremely pure water. If untreated water is used, minerals such as calcium, magnesium, silica, and chlorides can cause scaling, corrosion, and deposits, which reduce efficiency and may damage critical equipment.

Purpose of a DM Plant in Thermal Power Plant

The main purpose of the DM plant is to supply ultra-pure water to the boiler system. This helps to:

Prevent scale formation inside boilers and steam turbines
Reduce corrosion in pipelines and equipment
Improve heat transfer efficiency in boilers
Maintain high steam purity
Extend boiler and turbine life

Typical Process Configuration

Raw Water Tank → Feed Pump → Multimedia Sand Filter → Activated Carbon Filter → Water Softener (Optional) → Cartridge Filter → Reverse Osmosis Unit (Optional) → Cation Exchange Unit → Degasser Tower → Anion Exchange Unit → Mixed Bed Polisher → DM Water Storage Tank → Distribution Pump

Technical Specifications

Item	Specification
System Type	Ion Exchange Demineralization (RO + IX optional)
Feed Water Source	Municipal / Surface Water / Groundwater
Production Capacity	5 – 500 m³/hr (customizable)
Operating Pressure	0.2 – 0.6 MPa
Power Supply	380V / 50Hz / 3 Phase (customizable)
Operating Temperature	5 – 45°C
System Recovery Rate	65 – 85%

Output Water Quality of DM Plant in Thermal Power Plant

Parameter	Typical Value
Conductivity	≤ 0.2 µS/cm
Silica	≤ 0.02 ppm
Sodium	≤ 0.01 ppm
Total Dissolved Solids (TDS)	Nearly zero
Hardness	≤ 0.01 mmol/L
Chloride	Ultra-low

Water quality meets typical high-pressure boiler feedwater requirements.

Main System Components

Pretreatment Section

Raw water storage tank
Feed water pump
Multimedia sand filter
Activated carbon filter
Water softener (optional)
Cartridge filter (5 µm)

Primary Treatment Section

Reverse osmosis unit (optional)
High-pressure pump
RO membrane modules

Demineralization Section

Cation exchange vessel
Degasser tower
Anion exchange vessel
Mixed-bed polishing unit

Post-Treatment and Storage

DM water storage tank
Transfer pumps
Online conductivity meter

Control System

Automatic valve operation
PLC control system with touch screen (optional)
Online conductivity monitoring
Flow meters and pressure gauges
Automatic regeneration control

Materials of Construction

Component	Material
Filter Vessels	FRP / Carbon Steel / Stainless Steel
Piping	UPVC / SS304 / SS316
Membrane Housing	FRP / Stainless Steel
Structural Frame	Painted Carbon Steel or Stainless Steel

Applications in Thermal Power Plants

Boiler feedwater preparation
Steam generation systems
Turbine operation
Cooling water makeup
Power plant process water

Advantages

Produces ultra-pure boiler feedwater
Prevents scale formation in boilers
Reduces corrosion in pipelines and turbines
Improves heat transfer efficiency
Extends equipment service life
Stable and reliable operation

Optional Upgrades

Double-pass RO pretreatment
Electrodeionization (EDI) system
UV sterilization system
Remote monitoring and automation
Skid-mounted compact design

Successful Cases

Our Service

a.We provide full technical support and after equipment installation.
b.We help to train operator of the system. And detailed operating manual is provided.
c.7*24 hours phone assistance on technical support.
d.We provide consumable and spare parts in the long-term for cost price.