Cleaning agent and its application for on-line local cleaning of water-cooled wall of ironmaking blast furnace

Abstract

The invention relates to a cleaning agent for locally cleaning an ironmaking blast furnace water-cooling wall in an on-line loading manner and an application thereof. The cleaning agent consists of the following components by weight percent: 15-30% of hydrochloric acid (by the HCl), 10-20% of sulfamic acid, 10-20% of citric acid, 5-15% of 1-hydroxyethylidene-1,1-diphosphonic (HEDP), 5-15% of amino trimethylene phosphonic acid (ATMP), 0.2-1.0% of a corrosion inhibitor and 30-40% of water. Layering segmented cleaning is selectively carried out on the blast furnace water-cooling wall according to the scaling conditions of the blast furnace water-cooling wall, the blast furnace water-cooling wall is completely cleaned according to practical requirements, and equipment which does not need to be cleaned is not connected in a local cleaning process; the heat exchange efficiency of the blast furnace water-cooling wall is recovered, and energy sources are saved; the service life of the equipment can be prolonged; and the production efficiency is increased, and potential safety hazards are eliminated.

Description

technical field [0001] The invention belongs to the technical field of chemical cleaning, and relates to a cleaning agent for on-line local cleaning of a water wall of an ironmaking blast furnace and an application thereof. Background technique [0002] The blast furnace circulating cooling water system is mainly used to cool the blast furnace water wall, hot blast stove and other related equipment. After exchanging heat, the heat of the circulating water system is cooled by the cooling tower and recycled after cooling. The cooling tower and the cold water pool are in contact with the outside world. During the operation of the equipment, it will cause scaling on the water wall of the ironmaking blast furnace. [0003] The harmfulness of scaling on the water wall of the ironmaking blast furnace is specifically manifested in the following aspects: First, after the circulating water system of the ironmaking blast furnace is corroded and scaled, if it is not cleaned in time, the...

AI Technical Summary

Problems solved by technology

[0005] see figure 1 , the limitations of this large cleaning technology are manifested in the following aspects: First, this cleaning technology utilizes equipment and facilities such as cold water pools, process pipes, and circulating water pumps in the circulating cooling water system, but due to the large volume of the circulating cooling water system, The process pipeline is long, resulting in a large amount of cleaning chemicals used in this technology, high cost, and unbearable for users; second, this technology does not carry out targeted cleaning construction on the water wall of the ironmaking blast furnace alone, but on the circulating cooling water system including water cooling. Due to the complexity of blast furnace equipment, the flow rate, flow rate and temperature of circulating water flowing through each equipment are different, which often leads to poor cleaning effect and cannot meet user requirements; the third is the use of this technology The amount of cleaning chemicals used is large. After the construction, the circulating cooling water system needs to be drained and replenished in large quantities, thus causing serious environmental pollution and waste of water resources.

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