Connection structure for cylinder and tube plate of tube-type falling-film evaporator

Abstract

The invention discloses a connection structure for a cylinder and a tube plate of a tube-type falling-film evaporator, which comprises the cylinder and the tube plate. A cylinder nipple is welded between the cylinder and the tube plate, and the cylinder nipple is welded with the interior and the exterior of the tube plate. The connection structure disclosed by the invention is simple in structure. Due to the adoption of the connection structure, the stress corrosion can be reduced effectively, the tube hole can be prevented from deforming, and heat-exchanging tube can be installed more conveniently.

Description

technical field [0001] The invention relates to the field of tube-type falling-film evaporators, in particular to the connection structure between a cylinder body and a tube plate in the tube-type falling-film evaporator. Background technique [0002] Tubular falling film evaporators are widely used in many production fields such as papermaking, food, pharmaceuticals, sugar, etc., and their main function is to evaporate excess water in the production process. The tube type falling film evaporator currently used has a long cylinder body, which is welded by several tube sections, and the cylinder body and the tube sheet are firmly connected by direct welding. However, due to the length of the cylinder, the cylinder and the tube sheet can only be welded on the outside, and it is difficult to weld the inside of the cylinder and the tube sheet, and due to the large volume of the cylinder and the tube sheet, the overall stress relief heat treatment cannot be carried out. Only loc...

AI Technical Summary

Problems solved by technology

However, due to the length of the cylinder, the cylinder and the tube sheet can only be welded on the outside, and it is difficult to weld the inside of the cylinder and the tube sheet, and due to the large volume of the cylinder and the tube sheet, the overall stress relief heat treatment cannot be carried out. Only local stress relief heat treatment can be carried out, so the weld stress between the cylinder and the tube sheet is difficult to eliminate, and in addition to the difference in the thickness of the material between the cylinder and the tube sheet, the gap between the cylinder and the tube sheet The shrinkage between the tube plates is inconsistent, which will easily lead to cracking of the weld seam, which will cause the leakage of alkali solution in the cylinder and cause stress corrosion; in addition, because tube holes need to be opened on the tube plate, for the convenience of processing, the tube holes on the tube plate are welded between the tube plate and the cylinder However, when the local stress relief heat treatment is performed on the weld between the tube sheet and the cylinder, it is very easy to cause deformation of the tube hole, which makes it very inconvenient to perforate the heat exchange tube during assembly. can't even go through

Images