Cement-based anti-corrosion spraying material applied to steel chimney and preparation method of cement-based anti-corrosion spraying material

Abstract

The invention discloses a cement-based anti-corrosion spraying material applied to a steel chimney. The cement-based anti-corrosion spraying material comprises the following components in parts by weight: 50-100 parts of cement, 15-30 parts of silica fume, 8-22 parts of fly ash, 5-20 parts of quartz powder, 100-180 parts of quartz sand, 0.1-0.5 part of a tackifier, 1-15 parts of a flexibilizer, 0.5-8 parts of an anti-corrosion agent, 0.5-5 parts of a water reducing agent and 10-35 parts of water. The cement-based anti-corrosion spraying material disclosed by the invention has various properties such as high temperature resistance, acid corrosion resistance, water resistance, sagging resistance and the like, is excellent in mechanical property, durability and construction performance and long in service life, and has important practical value in anti-corrosion application of steel chimneys. The invention further discloses a preparation method of the cement-based anti-corrosion spraying material, the preparation method is simple and convenient to operate, preparation conditions are easy to control, the production cost is low, and the cost of steel chimney anti-corrosion construction can be effectively reduced.

Description

technical field [0001] The invention relates to the technical field of chimney anticorrosion, in particular to a cement-based anticorrosion spraying material applied to steel chimneys and a preparation method thereof. Background technique [0002] Cement plants will generate extremely high heat and a lot of corrosive gases during the production process, which will eventually be discharged through the chimney, making the steel chimney in the harsh service environment such as high temperature and corrosion for a long time, which puts forward higher requirements for the performance of the steel chimney . Therefore, more and more people have begun to research and develop the anticorrosion of steel chimneys. [0003] At present, the anti-corrosion of the inner wall of the steel chimney after wet desulfurization mainly has three types. The first type is to use corrosion-resistant light-weight heat insulation products to paste the inner wall of the steel to isolate the contact bet...

AI Technical Summary

Problems solved by technology

[0003] At present, the anti-corrosion of the inner wall of the steel chimney after wet desulfurization mainly has three types. The first type is to use corrosion-resistant light-weight heat insulation products to paste the inner wall of the steel to isolate the contact between the flue gas and the inner wall of the steel, such as foamed glass bricks, but domestically produced ones Foam glass bricks have the defects of low density, easy penetration, poor acid and corrosion resistance, and poor temperature resistance, and the adhesive used to bond foam glass bricks will soften and deform at about 150°C, and the foam glass bricks are easy to separate from the adhesive, resulting in large areas. and because the strength and density of foamed glass bricks and adhesives are not enough, in the environment of high-speed scouring of flue gas, the wear resistance of foamed glass bricks is very poor, and the service life is also very short; In this way, acid-resistant and corrosion-resistant metal alloy sheets are usually used as the inner lining, among which titanium-steel composite plate is a more suitable inner lining material, which can achieve the functions of structure (steel) and anti-corrosion (titanium) and play their respective roles. advantage, but its disadvantage is that the cost is higher

The third category is to use anti-acid corrosion coatings such as glass flake coatings and cement-based coatings to coat the surface of the steel inner wall to isolate smoke. The commonly used glass flake coatings and vinyl cool glass flake coatings are used at temperatures below 100°C , the service life is about 5 years, but after a period of use, it will crack, corrode the steel body and fall off; while the cement-based coating is a three-phase and non-uniform brittle material, which can improve during the process of hydration hardening. It has its own strength, but at the same time, it produces a large number of pores inside. Under severe service conditions, the structure of cement-based coatings is easily damaged, resulting in a sharp reduction in its service time

In order to meet the requirements of performance indicators, the cement-based coatings in the prior art add inorganic materials or organic materials to improve their performance, but they still cannot meet the requirements of mechanical properties, durability and construction performance, resulting in short service life and high cost. high

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