Lining plate for protecting self-evaporator from wear and corrosion

Abstract

The invention relates to a lining plate for protecting a self-evaporator from wear and corrosion. The lower end of a barrel is welded with cone section barrel parts; the lower end of the cone section barrel parts are welded with elliptical seal plates; the centers of the elliptical seal plates are welded with material-discharging steel pipes; the outer wall of the barrel is welded with support plates; the outer sides of the barrel and the cone section barrel parts are welded with corner plates at welding points; and the outer side walls of the elliptical seal plates are welded with raising plates. The lining plate can not only prevent direct erosive wear of sodium aluminate pulp to the self-evaporator barrel but also prevent an interlayer between the lining plate and the barrel from forming dead angles at circumferential welding points.

Description

technical field [0001] The invention belongs to the technical field of anti-scouring and anti-corrosion of alumina pulp self-evaporator, and provides a liner with a new structure, which can not only prevent the sodium aluminate pulp from directly scouring and wearing the equipment body, but also reduce the increase of alkali concentration in the local medium, preventing equipment Stress corrosion cracking occurs in the girth weld between the cylinder body and the head. Background technique [0002] At present, the key equipment in the high-pressure dissolution process of domestic alumina plants often suffers from stress corrosion cracking of the cylinder and head girth welds. At the same time, the shell of the self-evaporator is severely worn, and production is shut down, resulting in huge economic losses. Avoiding stress corrosion cracking and shell wear of the self-evaporator is the key point of the self-evaporator design. [0003] The design conditions of the self-evapor...

AI Technical Summary

Problems solved by technology

When the equipment cylinder wears seriously, the wall thickness of the cylinder will be thinned, the pressure bearing capacity of the equipment will be reduced, and the corrosion of the slurry self-evaporator cylinder will be aggravated, which will seriously endanger the safety of the operator. Therefore, the inside of the cylinder must be designed as an anti-scouring wear layer. , to prevent the direct erosion and wear of the cylinder by the sodium aluminate slurry

However, the structural design of the ordinary liner considers the erosion and wear of the medium, and ignores the stress corrosion caused by the medium to the equipment caused by the liner structure. The slurry forms a closed space from the evaporator, and the sodium aluminate slurry cannot flow out after flowing in, and stays in the closed space. Medium and high temperature environment (150-290°C), the water in the sodium aluminate slurry evaporates, and the alkali concentration increases, which intensifies the tendency of stress corrosion cracking of the girth weld. For details, see figure 1

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