Novel water treatment method for boiler feedwater

Abstract

A novel water treatment method for boiler feedwater of the invention comprises the following steps: sterilization, that is adding liquid chlorine, sodium hypochlorite or stabilized chlorine dioxide into a raw water tank, controlling the residual chlorine amount in water to be 0.2-0.5 mg / L; filtration, that is adding a polyaluminium chloride coagulant before a multimedium filter with an amount of 10-20 mg / L, controlling the water turbidity of the ultrafiltration feedwater to be not more than 0.1 NTU and the SDI to be not more than 3; adding a reducing agent of sodium bisulfite before ultrafiltration with an adding amount of 3-5 mg / L; reverse osmosis, that is performing desalination treatment by a reverse osmosis membrane device, continuously adding a PTP-0100 scale inhibitor before a security filter with an adding amount of 3-5 mg / L; continuously adding a Micro Treat BIO bactericide with an adding amount of 3-5 mg / L; additionally adding cleaning agents of Dimamite and High Flux once a month with an amount of 3-5% of the water amount to be produced; desalination, that is performing desalination by an electrical desalination system (EDI); deoxygenation, that is performing deoxygenation by a vacuum deoxygenator, adding 10-20 microgram / L of deoxidants, controlling the agent residual amount to be 5-20 microgram / L, adding a corrosion-inhibiting pH regulator to control the pH value to be 8.8-9.3.

Description

technical field [0001] The invention relates to the water treatment control technology of boiler feed water, especially the integration of the method, which is especially suitable for water treatment of high and medium boiler feed water systems. Background technique [0002] Boilers are steam or hot water generating equipment, and water is used as the heat transfer medium. Therefore, the quality of feed water is the core technology, and the use of qualified water quality is the prerequisite for ensuring the safe and stable operation of the boiler and the output of qualified steam or hot water. If the water quality of the feed water is poor, the hazards are as follows: 1. Scale formation: Scale causes damage to the metal on the heating surface of the boiler, reducing the service life of the boiler; reducing the flow section in the heating tube, increasing the flow resistance of the water circulation in the tube; reducing thermal efficiency, Increase coal consumption or reduc...

AI Technical Summary

Problems solved by technology

③Wu Jiquan and others studied the energy-saving water treatment process and its operation mode of industrial boilers and discussed the application of full-membrane treatment process, which is suitable for large and medium-sized boilers, but only made a general description of the process and lacked systematic research

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