Section 1: Sponge Iron Oxygen Scavenger Product Introduction
A sponge iron deoxygenator is an oxygen removal device. Water containing oxygen enters the deoxygenator and passes through the sponge iron filter material layer. This specially formulated sponge iron filter material has a vast specific surface area, allowing for a complete oxidation reaction between the dissolved oxygen in the water and the iron.
Section II: Sponge Iron Oxygen Removal Device Product Details
Removing oxygen dissolved in water is crucial for preventing corrosion in boilers or other water-using equipment and ensuring their safe and economical operation. Our company has introduced patented technology since 1995 and developed an atmospheric temperature filtration deaerator. Over the years since its launch, it has been proven that the dissolved oxygen content in the deaerator's output can be guaranteed to be below 0.05 mg/L, making it a commonly used product for low-pressure boiler deaeration. The consumption of activated carbon is low, and typically, it only needs to be replenished once every 3 to 6 months based on the water volume and quality. The water after deaeration contains a small amount of iron ions (usually 0.2 to 0.5 mg/L), which still meets domestic water quality standards for hot water boilers. However, for steam boilers or for deaeration of feedwater with strict requirements for iron ions, an iron removal unit can be installed after the existing deaerator to remove iron ions from the deaerator's output, ensuring the quality of the boiler feedwater. Our company offers various sizes of ion exchange iron removal units for customer selection.
Section 3: Features of Sponge Iron Oxygen Removal Equipment
1. Oxygen removal can be achieved at room temperature without the need for heating the incoming water. This overcomes the drawbacks of thermal and vacuum oxygen removal, which require heating and energy consumption.
2. Oxygen removal is stable and reliable, with the dissolved oxygen content in the outflow water consistently below 0.05 mg/L, meeting the domestic low-pressure boiler water quality standards.
3. A full range of equipment is available, with both automatic and manual control options for user selection.
4. Installation has no special requirements; it overcomes the inconvenience of high installation required for thermal and vacuum oxygen removal.
5. The system is simple and the equipment is compact, occupying minimal space.
6. No need for a backwash pump installation for each fully automatic deoxygenation and deironing unit.
7. Water containing oxygen passes through a specially formulated iron sponge filter material, primarily composed of iron. The loose and porous internal structure of this material boasts a vast surface area, enabling a complete oxidation reaction between the oxygen in the water and the iron, ensuring that the dissolved oxygen content in the effluent remains below 0.05 mg/L. The reaction equation is:
2Fe 2H2O O2 →2Fe(OH)2
Fe(OH)2 adsorbs onto sponge iron particles, but it is unstable in oxygenated water; it will be oxidized into a trivalent iron compound, with the reaction equation being:
4Fe(OH)2 2H2O O2→ 4Fe(OH)3↓
The reaction product Fe(OH)3 is a brownish-red, water-insoluble flocculent precipitate, which is trapped within the granules of sponge iron. Once it accumulates to a certain extent, it can be thoroughly flushed out with a moderate intensity of backwashing water, restoring the sponge iron oxygen scavenger to its initial oxygen removal capacity.
Deep within the filter layer, due to the low oxygen concentration in the water, there is a small amount of Fe2 that is in equilibrium with Fe(OH)3, which can be removed by sodium form strong acidic cation exchange resins. The exchange reaction is:
Fe2 2RNa → R2Fe 2Na
After resin failure, it can be regenerated using a dilute solution of NaCl (salt) and Na2SO3 (the total capacity of Na2SO3 and NaCl is a solid mixture of 1% to 2%). The addition of Na2SO3 is to improve the regeneration of the resin and extend its service life.
Four. Principle of Automatic Oxygen Remover Control
The fully automatic deaerator system is mainly composed of multiple control diaphragm valves (hydraulic or pneumatic), a JMA multi-valve controller, and a deaeration tank. The controller, based on pre-set programs, issues open/close commands to each controllable diaphragm valve to complete the opening and closing of various passages, thereby achieving the different process steps such as operation, backwashing, and cleaning. The JMA multi-valve controller responsible for the control is made up of a signal distributor and a timer controller, both mounted within a waterproof controller housing. The signal distributor is a rotary guide valve that directs the switching of liquid or gas signal sources to the various diaphragm valves on the equipment, thereby accomplishing automatic control of the system. The valve core of the signal distributor is made of durable, corrosion-resistant, self-lubricating material, featuring a long service life and no maintenance required. The valves used for operation are the mature hydraulic or pneumatic diaphragm valves that have been widely used both domestically and internationally. These valves are easy to install and maintain, allowing non-specialists to complete checks, repairs, and replacements.
Five. Sponge Iron Oxygen Removal Filter Media – Sponge Iron Filter Media
The performance of the sponge iron filter material is a decisive factor in whether the deaerator can meet the design specifications. The deaerator must use specially formulated sponge iron to achieve the desired deoxygenation effect. The HY sponge iron filter material is a high-efficiency deaerator-specific sponge iron filter material developed by Haoyang Company, having been proven over many years of industrial practice. It can fully meet the deaerator's water output design specifications, and boasts high purity, strong resistance to scaling, and stable quality, making it very popular among users.
Section 6: Sponge Iron Oxygen Scavenger Technical Parameters
Work Flow Rate: 20~30 m/h
Anti-money laundering flow rate: 50 m/h
Anti-laundering time: 5~8 minutes
Flow Rate: 20~30 m/h
Rinsing Time: Until Water Clears
Terminal Control: Inlet and outlet pressure difference ≤ 0.05 MPa
Section 7: Main Technical Specifications of Sponge Iron Filter Media
Specific Surface Area: <1.06 m2/g
Total Iron (Fe): ≥95%
Particle Size Range: 1.0~5.0mm
Detergents, accelerators: ≈ 4% <
Bulk Density: 1.7 g/cm³
Section 8: Installation and Usage Precautions for Sponge Iron Oxygen Removal Devices
[1] New equipment or newly filled sponge iron should be first subjected to a thorough cleaning process to ensure the complete removal of impurities.
When filling with sponge iron, ensure the height of the filling is consistent in both compartments of the tank.
[3]For steam boiler water deoxygenation, it is required to match a dedicated iron removal tank after the deoxygenator.
[4] When the filling height is less than 800mm, it is necessary to promptly replenish sponge iron to reach the required height (level with the centerline of the upper mirror).
[5]When the deaerator is not in use, it should be flushed clean and filled with water, sealed under normal pressure, and must not lose water.
Section 9: Automatic Sponge Iron Oxygen Removal System Selection
Ten, Instructions for Use
Reverse osmosis can use tap water or well water, but it must meet the specifications for reverse osmosis pipe diameter or flow rate listed in the technical parameters table.
Deoxygenated water should be kept isolated from air. Our company can provide matching deoxygenated water tanks or modify existing tanks.
Deaerator outlet water should not directly enter the boiler or heating system.
Manual equipment operation is set to terminate when the differential pressure between import and export reaches 0.05 MPa, while automatic equipment is set for timed backwashing.
Eleven, User Guidelines
Please specify whether the oxygen scavenger is to be controlled manually or automatically when placing an order.
2. Oxygen Remover Inlet Water Temperature Exceeding 50°C: Must be specified at the time of order for special processing by the manufacturer.
3. The tank body is made of carbon steel; custom orders are available upon special request.
4. When the filling layer is below 0.8 meters, add sponge iron to reach a height of 1.2 meters. Under continuous operation, it is generally necessary to replenish once every quarter.
5. When filling with sponge iron, add equal amounts through both filling holes at the top of the drum to ensure the sponge iron layers in the two compartments are of equal height.
6. Continuous flow should not exceed 10% of the designed flow rate.
7. Prior to first use, new equipment or new sponge refill must be thoroughly backwashed before being put into service.
8. Before switching from manual equipment cleaning to water supply, observe if the drainage has completely cleared to prevent incomplete cleaning and contamination of the water supply system.
9. When the deaerator is not in use, it should be flushed clean and filled with water to ensure it is sealed and oxygen-free inside, absolutely no air should enter.
10. Install a bypass during pipeline installation to ensure uninterrupted water supply during equipment maintenance.
11. Oxygen removal is suitable for hot water boilers with a pressure of p<2.5MPa. For steam boilers, our company will provide the corresponding iron removal equipment.
