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Central circulation tube evaporator

A central circulation tube and evaporator technology, applied in vertical tube evaporators, evaporator accessories, evaporation, etc., can solve problems such as low convective boiling heat transfer coefficient, reduced effective temperature difference, easy scaling, etc., to achieve Improve convective heat transfer coefficient and convective diffusion ability, improve convective heat transfer coefficient, and not easy to scale

Inactive Publication Date: 2018-07-24
FOSHAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the existing central circulation tube evaporator, due to the continuous circulation of the solution, the solution in the heating tube is always close to the concentration of the completed liquid, so the solution has a high viscosity, a high boiling point, a reduced effective temperature difference, and a low convective boiling heat transfer coefficient. fouling

Method used

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  • Central circulation tube evaporator
  • Central circulation tube evaporator
  • Central circulation tube evaporator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] like figure 1 and figure 2 As shown in the figure, a central circulating tube evaporator includes a cylinder body 1, an upper tube sheet 2 and a lower tube sheet 3 welded in the cylinder body 1 and vertically connected to the cylinder body 1, and the upper tube sheet 2 and the lower tube sheet 3 are connected between There is a central circulation pipe 4 coinciding with the axis of the cylinder body 1 and a group of boiling pipes 5 arranged around the central circulation pipe 4. The upper tube plate 2 is connected with the upper head to form a steam chamber cavity 6, and the lower tube plate 3 is connected to the lower seal. The head forms the lower tube box 7, the cylinder body 1 is connected to the shell side primary steam inlet pipe 8 near the upper tube sheet 2, and the other side of the cylinder body 1 opposite to the shell side primary steam inlet pipe 8 is close to the lower tube sheet 3. There is a shell-side condensed water outlet pipe 9, a tube-side solution...

Embodiment 2

[0031] like figure 1 and image 3 As shown in the figure, the structure of the central circulating tube evaporator is the same as that of Embodiment 1, except that: the outer surface of the boiling tube 5 is provided with 8 micro-concave surfaces 55 along the circumferential direction, and the micro-concave surfaces 55 are spherically arranged on the outer surface of the boiling tube 5. The surfaces are equally spaced along the axial direction, and spherical protrusions 56 are formed on the inner surface of the boiling tube 5 corresponding to the micro-concave surface 55 outside the tube. The ratio of the diameter of the micro-concave surface 55 to the diameter of the boiling tube 5 is 1:10.

Embodiment 3

[0033] like figure 1 and Figure 4 As shown in the figure, the structure of the central circulating tube evaporator is the same as that of the embodiment 1, the difference is that, in order to further improve the convective heat transfer coefficient, the outer surface of the boiling tube 5 is provided with four grooves 51 and four microchannels at intervals along the circumferential direction. The concave surfaces 55 and the four micro-concave surfaces 55 are evenly arranged on the protrusions 54 in the two adjacent grooves 51 .

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Abstract

The invention discloses a central circulating tubular evaporator. The central circulating tubular evaporator comprises a barrel, an upper tube plate and a lower tube plate, wherein the upper tube plate and the lower tube plate are welded into the barrel and vertically connected with the barrel, a central circulating tube and a set of boiling tubes are arranged between the upper tube plate and the lower tube plate, the axis of the central circulating tube is coincident with the axis of the barrel, the boiling tubes surround the central circulating tube, and the outer surfaces of the boiling tubes are provided with a plurality of grooves and / or tiny concave surfaces in the circumferential direction. According to the central circulating tubular evaporator, the outer surfaces of the boiling tubes are provided with the grooves and / or the tiny concave surfaces in the circumferential direction, convex ribs in the tubes stretch into the central areas of the tubes, and heat exchange of fluid in the central areas in the tubes is enhanced; tiny spherical protrusions in the tubes periodically disturb the fluid close to the walls of the tubes, under the same flow sectional area, the heat transfer area is enlarged, the heat transfer rate is increased, and scaling does not occur easily.

Description

technical field [0001] The invention relates to the technical field of heat exchange equipment, in particular to a central circulating tube type evaporator. Background technique [0002] The central circulation tube evaporator is a natural circulation type evaporator. It is a large-scale evaporator widely used in industrial production and has a long history. It is still widely used in chemical, light industry, environmental protection and other industries. The central circulating tube evaporator is developed from the horizontal heating chamber and the coil heating chamber evaporator. Compared with these old-fashioned evaporators, it has the advantages of good solution circulation and fast heat transfer rate. At the same time, due to its compact structure and convenient manufacturing , it is widely used, and it is called "standard evaporator". However, in the existing central circulating tube evaporator, due to the continuous circulation of the solution, the solution in the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D1/00B01D1/12B01D1/30
CPCB01D1/00B01D1/12B01D1/30
Inventor 黄德斌黄华健
Owner FOSHAN UNIVERSITY
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