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Boiler Feed Water

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Water Quality

Raw water is usually surface water, groundwater, seawater desalination system product water, etc., containing suspended solids, microorganisms, organic matter, water quality is instable with seasonal fluctuation range and high colloid content.

Purpose of Treatment

To ensure the long-term stable operation of the boiler, have high requirement of water quality for boiler feed water, it is mainly necessary to remove suspended solids, colloids, microorganisms, organic matter, salt, etc. from the water source, and the discharge water resistivity reaches 15-18 MΩ·cm.

Process Flow Diagram (Featured Process)

工艺流程图 电力_页面_2_副本.jpg

MMF+ACF+RO+MB/EDI

Process Description

Multiple Media Filter (MMF): Suspended particles and colloids in water are intercepted at the surface or internal gaps of the quartz sand bed and anthracite layer of the filter when water or wastewater pass through, thus clarify the water. The Turbidity of inlet water is normally smaller than 20, the turbidity of discharge water is capable of less than 3. The system could remove the suspended particles, colloids, turbidity, etc. from raw water, the removal rate of suspended particles could reach 90%.

Activated Carbon Filtration (ACF): The organics and free chlorine is adsorped or chemically removed by activated carbon when water or wastewater pass through the activated carbon layer of the filter, to meet the inlet water requirement of the next stage equipment. Normally it can remove 60% to 80% of colloids, 50% Ferric and 50% to 60% organics from water. The system could remove colloids and organics, the removal rate of organics could reach more than 50%.

Reverse osmosis (RO): Reverse osmosis, a membrane separation operation that uses pressure difference as driving force to separate a solvent from a solution. Pressure is applied to the liquid on one side of the membrane. When the pressure exceeds its osmotic pressure, the solvent reversely penetrates against the direction of natural permeation. Thus, permeate is obtained on the low-pressure side of the membrane and concentrate is obtained on the high-pressure side. The system could desalinate raw water, the desalination rate could reach more than 97%.

Mixed Bed (MB): RO product water is treated with mixed bed to further remove anions, cations, CO2 and SiO2 from the water to ensure that the effluent quality is up to standard. When the anions and cations generated by the ionization of various inorganic salts in water are replaced by hydrogen ions in the cation resin and hydroxide ions in the anion resin, respectively, through the ion exchange resin layer, and hydrogen ions and hydroxide ions in the water are combined to form water molecule, thus remove the inorganic salts from water. The system could further remove the salts in RO product water, the effluent resistivity can reach above 17 MΩ·cm.

Electrodeionization (EDI): The ion exchange resin is filled in the fresh water chamber of the electrodialyser to organically combine ion exchange and electrodialysis, and simultaneously realize deep desorption and concentration of ions under the action of a direct current electric field, and a novel composite separation process of continuous electric regeneration of the resin. This system could further demineralize the effluent from the RO system, the effluent resistivity can reach 18 MΩ·cm or more.

Process Advantages

Mature technology: The process adopts MMF + ACF + RO + MB/EDI to remove the salts from raw water, the whole process is physical with no phase change and low energy consumption.

Wide range of adaptation: The technology can adopt groundwater, seawater desalination product water, even surface water, could adjust to the seasonal change of water quality.

Ultra-flexible design: The system is divided into pretreatment module, desalting module, post process module, is capable of separate operation, can be freely assembled base on the influent water quality.

Short construction period: Using modular design, individual module is integrated in the factory, reducing on-site work, realizing containers assembly, reducing civil construction period, thus reducing construction period.

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