Anticorrosion method of chimney used for discharging wet-method desulfurized fume

Abstract

The invention belongs to the field of anticorrosion of wet chimneys and discloses an anticorrosion method of a chimney used for discharging wet-method desulfurized fume. The method comprises the following steps of: continuously producing fiber glass reinforced plastic protection plates 2 which have a ribbed strap structure by using a fiber glass reinforced plastic material which has high corrosion resistance in a pultrusion and compression molding mode; fixing the fiber glass reinforced plastic protection plates 2 on the inner surface of a fume discharging cylinder 1 of the chimney by means of hanging, fixing by bolts, bonding or welding; and smartly connecting the fiber glass reinforced plastic protection plates one another to form an airtight complete fiber glass reinforced plastic protection cylinder which can efficiently prevent leakage of the fume to protect the chimney against the corrosion by the wet-method desulfurized fume.

Description

technical field [0001] The invention relates to an anticorrosion method applied to a chimney for discharging flue gas after wet desulfurization. technical background [0002] The wet desulfurization technology represented by limestone-gypsum is widely used in the process of flue gas emission treatment of thermal power plants because of its high efficiency of sulfur dioxide removal in flue gas and low operating cost. However, after the flue gas undergoes wet desulfurization, it has a certain impact on flue gas emissions. The temperature of the flue gas before wet desulfurization is about 120°C-150°C, and after desulfurization, the temperature drops to 40°C-55°C; the water vapor in the flue gas is saturated, and the flue gas from the desulfurization device inevitably contains mist entrainment; although the removal efficiency of sulfur dioxide in the wet desulfurization process can reach 95%, there are still some parts that cannot be removed, while the removal efficiency of su...

AI Technical Summary

Problems solved by technology

[0009] However, these solutions have various problems in the actual engineering application process, and it is difficult to achieve the desired anti-corrosion effect and completely solve the problem of wet chimney anti-corrosion

[0010] 1. The scale resin lining is used, which has good anti-corrosion performance, but the adaptable temperature is relatively low, the service life is short, and the on-site construction period is long. The quality requirements for on-site construction, the construction period is long, and the service life is short;

[0011] 2. Foam glass bricks and vitrified ceramic bricks need to be bonded to the steel inner cylinder with organic anti-corrosion adhesives. There are many factors affecting the quality of anti-corrosion, and the requirements for on-site construction are very high. Defects in local anti-corrosion will cause the entire anti-corrosion The plan failed, and the water absorption rate of the pads was high, and the quality of the gaps between the pads was difficult to guarantee;

[0012] 3. Brushing anti-corrosion paint, although the construction speed is fast, but the anti-corrosion performance is poor and the service life is short;

[0013] 4. Titanium lining scheme, although the titanium plate has good anti-corrosion performance, but due to the high requirements for welding, corrosion cases caused by weld seams emerge in endlessly, and the cost of this scheme is very high;

Images