Chemical Dosing System For Boiler Water Treatment 1

Chemical Dosing System For Boiler Water Treatment 2

Chemical Dosing System For Boiler Water Treatment

The Boiler Water Treatment Dosing System is a fully automatic integrated equipment specially designed for maintaining the water quality of industrial boilers. Its core function is to accurately and stably add specific chemical agents to boiler feed water or boiler water, thereby preventing corrosion, scaling and other defects in the boiler system, extending the service life of the boiler, improving heat transfer efficiency, and ensuring the safe and economical operation of the boiler.

This system is highly adaptable and can be customized according to different boiler types and water quality requirements. It is widely used in power station boilers, industrial steam boilers and hot water boilers. By integrating high-precision dosing components, intelligent control systems and reliable detection devices, it effectively solves the problems of unstable manual dosing, low efficiency and poor water quality control effect, and meets the strict water quality management standards of modern industrial boilers.

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Application Scenarios

Chemical Dosing System For Boiler Water Treatment 3

Power Station Boilers

•Suitable for large-scale power station boilers (including subcritical, supercritical and ultra-supercritical boilers) with high parameters (high temperature, high pressure). It mainly provides coordinated phosphate treatment and precise dosing of oxygen scavengers to cope with the harsh working conditions of high pressure (up to 35MPa) and high temperature (up to 600℃), ensuring the cleanliness of the boiler heating surface and preventing hydrogen damage and scaling.

Chemical Dosing System For Boiler Water Treatment 4

Industrial Steam Boilers

Applied to industrial steam boilers in chemical, textile, food, pharmaceutical, metallurgy and other industries. It focuses on scale inhibition and oxygen removal to ensure the quality of steam (such as dryness and purity) and avoid product quality impacts caused by impure steam. It is compatible with boilers with steam production ranging from 0.5t/h to 100t/h.

Chemical Dosing System For Boiler Water Treatment 5

Hot Water Boilers

Used in hot water boilers for central heating, industrial heating and domestic hot water supply. The main function is to adjust the pH value of the water and add corrosion inhibitors to prevent corrosion of the boiler and the entire heating network pipeline, reducing maintenance costs and ensuring the stability of the heating system.

Dosing Types & Functions

Dosing Type	Core Function	Applicable Scenario	Typical Agents
Oxygen Scavenger	Quickly remove dissolved oxygen in boiler feed water, inhibit oxygen corrosion of boiler tubes and metal components; some types can form a protective film on the metal surface to enhance corrosion resistance	All types of boilers, especially power station boilers and high-pressure industrial steam boilers with strict corrosion requirements	Sodium sulfite, hydrazine, cyclohexylamine, diethylhydroxylamine (DEHA)
Scale Inhibitor	Inhibit the precipitation and crystallization of calcium, magnesium, silicon and other ions in water on the boiler heating surface; disperse tiny scale particles to prevent scale formation and improve heat transfer efficiency	Industrial steam boilers and hot water boilers with high hardness of feed water	Organic phosphonates, polycarboxylates, polyphosphates, silicates
pH Regulator	Maintain the pH value of boiler water in the optimal alkaline range (usually 9.0-11.0) to prevent acid corrosion of metal materials; enhance the effect of scale inhibitors and corrosion inhibitors	All types of boilers, especially hot water boilers and low-pressure steam boilers	Sodium hydroxide, ammonia water, trisodium phosphate
Phosphate	Carry out coordinated phosphate treatment for medium and high-pressure boilers; adjust the pH value of boiler water while forming loose phosphate scale that is easy to discharge, preventing hard scale formation and hydrogen corrosion	Medium and high-pressure power station boilers (pressure > 9.8MPa) and large industrial steam boilers	Trisodium phosphate, disodium hydrogen phosphate, sodium dihydrogen phosphate

Core Working Principle

The system adopts a "detection - control - dosing - feedback" closed-loop control mode to realize precise dosing. The specific working process is as follows:

Parameter Detection

On-line sensors (dissolved oxygen analyzer, pH meter, conductivity meter, flow meter, etc.) collect key parameters such as boiler feed water flow, dissolved oxygen content, boiler water pH value and conductivity in real time, and transmit the data to the PLC control system.

Dosage Calculation

The PLC controller compares the collected actual parameters with the preset target values (such as dissolved oxygen ≤ 10μg/L, pH 9.5-10.5), and calculates the required dosage of each agent through the built-in water treatment kinetic model and PID algorithm.

Precise Dosing

The frequency conversion dosing pump adjusts the output flow steplessly according to the control signal of the PLC, and delivers the agent from the storage tank to the designated dosing point (feed water pipeline, boiler drum, etc.) through the corrosion-resistant pipeline. The pulsation damper and back pressure valve ensure stable dosing pressure and flow.

Feedback Adjustment

The system continuously monitors the water quality parameters after dosing. If there is a deviation between the actual value and the target value, the PLC will dynamically correct the dosage in real time to ensure the stability of the boiler water quality.

Core Modules & Advantages

Core Modules

● Agent Storage Module: Composed of corrosion-resistant storage tanks, ultrasonic liquid level sensors and liquid level alarms.

It realizes safe storage of agents and real-time monitoring of liquid level. When the liquid level is too low, it automatically alarms to remind replenishment.

● Precision Dosing Module: Equipped with frequency conversion diaphragm dosing pumps，pulsation dampers, Y-type filters and electromagnetic flow meters. The dosing accuracy is up to ±0.5%, and the filter prevents impurities from clogging the pump body.

● Intelligent Control Module: Integrates PLC controller (Siemens/Schneider), It supports automatic/manual switching. The touch screen provides a visual operation interface for parameter setting and fault query.

● Detection & Sensing Module: Configured with high-precision on-line instruments (dissolved oxygen analyzer, pH meter, conductivity meter) and flow meters. The instruments have automatic calibration and cleaning functions, ensuring long-term measurement accuracy.

Multi-Agent Integrated Dosing

1-4 sets of independent dosing units can be configured to add oxygen scavengers, scale inhibitors, pH regulators and phosphates at the same time, meeting the comprehensive water treatment needs of different boilers.

High Precision & Stable Performance

Adopts frequency conversion dosing pump and closed-loop control system, the dosing accuracy is up to ±0.5%, which effectively avoids excessive dosing or insufficient dosing, and reduces agent consumption by 10-15% compared with manual dosing.

Corrosion-Resistant Design

Key components such as storage tanks, pipelines and pump heads are made of corrosion-resistant materials, which can resist the corrosion of various acidic, alkaline and organic agents, and the service life of the whole machine is ≥8 years.

Fully Automatic Operation

It can realize 24-hour unattended operation, automatically complete parameter collection, dosage calculation and dosing adjustment, reducing labor intensity by more than 90%.

Strong Adaptability

It can be customized according to boiler capacity (0.5t/h-1000t/h) and working pressure (0.1MPa-35MPa), and is suitable for various application scenarios such as power stations, industry and heating.

Perfect Safety Protection

Equipped with liquid level alarm, pump overload protection, water quality over-standard alarm and emergency stop functions. In case of abnormality, it can automatically take protective measures to ensure the safety of the boiler and the system.

Installation & Maintenance

Site Requirements

Flat concrete ground with load-bearing capacity ≥1.5 times the net weight of the equipment; good ventilation and drainage; away from open flames and high-temperature heat sources; reserved maintenance space ≥800mm around the equipment.

Power Supply

Voltage stability ±5%; equipped with independent power distribution cabinet and grounding device (grounding resistance ≤4Ω); power cable cross-section meets the equipment power requirements.

Pipeline Connection

The dosing pipeline is connected to the boiler feed water pipeline or drum through flanges, and a check valve is installed to prevent backflow; the pipeline material should be consistent with the agent type (corrosion-resistant material is required for acidic/alkaline agents).

After-Sales Service

Warranty Period

1 years for the whole system

Technical Support

Provide 24-hour response technical support (email, video,phone call) to solve operation and maintenance problems in a timely manner.

On-Site Service: For faults that cannot be solved remotely, on-site service will be arranged within 72 hours for overseas customers (major regions) and 48 hours for domestic customers.
Spare Parts Supply: Set up spare parts warehouses in Asia, Europe and North America to ensure that common spare parts (seals, filter screens, pump diaphragms) are delivered within 3-7 working days.
Training Service: Provide free on-site training for 3-5 operators, covering equipment operation, parameter setting, maintenance and fault handling; provide multi-language operation manuals and training videos.

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