Heat transfer intensification and automatic cleaning mechanism of natural circulation evaporator

Abstract

The invention discloses a heat transfer intensification and automatic cleaning mechanism of a natural circulation evaporator. The automatic cleaning mechanism at least comprising straight leaf discs,heat transfer intensification and automatic cleaning function screws and hanging weights is mounted on heating pipes of the center circulating pipe natural circulation evaporator. When the mechanism operates, the straight leaf discs utilize rise of ram pressure of undulatory flows of vapor-liquid two-phase flows at orifice sections of the heating pipes; the hanging weights provide downward movement power; and the function screws make up and down reciprocating motion with a stroke of 20-100mm, autorotate slowly or radially vibrate quickly for automatic cleaning and convective heat transfer intensification of inner walls of the pipes. The automatic cleaning mechanism is reliable and simple in structure, is applicable to the heat transfer intensification and automatic cleaning of the heatingpipes of the vertical shell and tube natural circulation evaporator, an evaporating crystallizer, and a reboiler.

Description

technical field [0001] The invention relates to a heat transfer enhanced automatic cleaning mechanism of a natural circulation evaporator, and relates to a convective heat transfer enhanced automatic cleaning in heating pipes of a natural circulation evaporator and a reboiler. It is mainly suitable for automatic cleaning of natural circulation vertical tube evaporators, evaporation crystallizers and reboilers that are prone to crystallization salt scale in the heating tube. Background technique [0002] The natural circulation vertical tube evaporator is one of the most traditional and simple evaporators in structure, but the natural circulation flow rate is low, the heating tube is easy to scale when the salt solution evaporates, frequent parking and cleaning, low efficiency and high energy consumption. Therefore, it cannot be applied to the evaporation production of high-salt solution. Although the literature introduces the vapor-liquid-solid three-phase fluidization tech...

AI Technical Summary

Problems solved by technology

[0002] The natural circulation vertical tube evaporator is one of the most traditional and simple evaporators in structure, but the natural circulation flow rate is low, and the heating tube is easy to foul when the salt solution evaporates, frequent parking and cleaning, low efficiency and high energy consumption

Therefore, it cannot be applied to the evaporation production of high-salt solution

Although the literature introduces the vapor-liquid-solid three-phase fluidization technology (the three-phase flow evaporation anti-scaling and energy-saving technology of the first issue of China Well Mine Salt in 2012; the new technology of anti-scaling of evaporation equipment and its Application in the production of calcium chloride), the cleaning ability is relatively large, but the external circulation system of particles is complicated, and the uniform distribution of particles in the tube bundle is difficult, etc., so it is difficult to popularize, especially not suitable for the application of crystallization products, because Complete separation from crystalline product is not possible

The twisted belt cleaning technology introduced in another document (ZL002224697.x self-rotating twisted belt automatic cleaning high-efficiency evaporator) has weak descaling and cleaning capabilities for hard dirt such as crystalline salts, and cannot meet the production requirements of automatic cleaning and stable and efficient operation.

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