Waste heat boiler deoxidation system and deoxidation process

Abstract

The invention discloses a waste heat boiler oxygen removal system, which includes a raw water supply system, a membrane oxygen removal system, a boiler feed water pump and a waste heat boiler connected in sequence; the membrane oxygen removal system includes several membrane filters connected by a pipeline system , an online oxygen analyzer on the pipeline system, and a vacuum pump connected with the membrane filter; and discloses the specific structure of the membrane filter. At the same time, a waste heat boiler deoxidation process is also provided. The water flow enters from the water inlet through the raw water supply system, passes through the water distribution pipe, hollow fiber membrane, partition and water collection pipe, and flows out from the water outlet; under vacuum conditions, supplemented with nitrogen from the water outlet The air inlet enters the purge, and the gas in the water body passes through the membrane filaments of the hollow fiber membrane, and is sucked away by the vacuum pump to the inside of the membrane filaments. The present invention uses a membrane deaeration system to replace the previous thermal deaeration system, which can separate the dissolved oxygen in the boiler feed water well, so that the dissolved oxygen content reaches the level required by the national standard, and the dissolved oxygen in the boiler feed water is usually 50-70ppb.

Description

technical field [0001] The invention relates to the field of boiler oxygen removal, in particular to a waste heat boiler oxygen removal system and oxygen removal process. Background technique [0002] In industries such as boilers and power plants, the existence of dissolved oxygen is the main cause of corrosion of thermal equipment (such as boilers, steam turbines, etc.). Because dissolved oxygen is very active at high temperature and high pressure, it will severely corrode metal equipment, resulting in oxygen corrosion of the boiler during operation or shutdown. Therefore, the country has also made corresponding regulations on the dissolved oxygen in the feed water of the boiler. For example, according to GB1576-2001 "Water Quality of Industrial Boilers": boilers with rated evaporation greater than 6T / H must be deoxygenated. Boilers with rated evaporation less than 6T / H should be deaerated as much as possible. Moreover, the dissolved oxygen content of boiler feed water ...

AI Technical Summary

Problems solved by technology

Secondly, when the heat load changes frequently, it is difficult for the steam consumption to follow the feedback in time, and the temperature of the deoxygenated water changes greatly, and the deoxygenation effect is not good

Third, this deaeration method requires equipment to be arranged at a high level, which increases infrastructure investment and is inconvenient to design and install.

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