Efficient deoxidizing agent for boiler feed water and preparation method and application of efficient deoxidizing agent

Abstract

The invention relates to an efficient deoxidizing agent for boiler feed water and a preparation method and application of the efficient deoxidizing agent. The efficient deoxidizing agent is prepared from the raw materials in percentage by weight: 8-15% of organic amine modified lignin, 10-18% of erythorbic acid, 2-4% of polyepoxysuccinic acid, 1-3% of polyaspartic acid, 4-6% of a pH regulator,0.4-0.8% of tetramethyl p-phenylene diamine, 0.2-0.4% of carbohydrazide, 0.1-0.4% of methyl ethyl ketoxime, and the balance of water. The deoxidizing agent can be used for water treatment for a steam boiler, a hot water boiler, a heating system and a water feeding pipeline. Compared with the prior art, the organic amine modified lignin and the erythorbic acid are jointly used as a deoxidant, the organic amine modified lignin has the effect of adsorbing oxygen and can reduce dissolved oxygen in water and assist the erythorbic acid to form a protective oxide layer on the metal surface, at differenttemperatures of boiler water, the concentration of a deoxidizing agent system in the gas phase / liquid phase can be balanced, the oxygen-removing corrosion inhibition effect is improved, and the corrosion problem of boilers, pipelines and heat exchangers is solved.

Description

technical field [0001] The invention belongs to the technical field of industrial water treatment, and relates to a high-efficiency deoxidizer for boiler feed water and a preparation method and application thereof. Background technique [0002] In the boiler feed water treatment process, oxygen corrosion is the most common and serious corrosion in the boiler system. Since the feed water is generally in contact with the atmosphere, the dissolved oxygen in the water is basically saturated, so the pipelines and equipment through which the feed water flows may have the possibility of oxygen corrosion. It can be seen that oxygen is the main corrosive substance in the boiler water supply system, and the oxygen in the water supply system should be removed quickly, otherwise it will corrode the boiler water supply system and components, and generate corrosive substances, such as iron oxide, and corrosive substances enter In the boiler, it will deposit or adhere to the boiler tube w...

AI Technical Summary

Problems solved by technology

Traditional oxygen scavengers, such as hydrazine, sodium sulfite, oxime compounds, hydroxylamine compounds, carbohydrazides, etc., have many restrictions on their use conditions

For example, the use effect of hydrazine is greatly affected by the water temperature and pH value, and hydrazine itself is toxic and flammable, so there are safety problems in use, storage, and transportation, and it cannot be used in boiler return water as drinking water or in case of food contact

However, sodium sulfite can only be used in medium and low-pressure boiler systems, and its deoxygenation and slow-release effect is average. It is easy to decompose at high temperature, and it is also toxic. Its use is limited to a certain extent.

Oxime compounds, hydroxylamine compounds and other oxygen scavengers have problems such as low deoxidation efficiency, and ammonia water should be assisted to adjust pH during use

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