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Member for online cleaning and removing scale of heat exchange tube

A technology for heat exchange tubes and components, applied in the field of on-line cleaning and descaling of heat exchange tubes, can solve problems such as unsatisfactory cleaning and descaling effects, difficult wet diameter and specific gravity of rubber balls, and large flow resistance, etc. The effect of controllable and stable density and low flow resistance

Inactive Publication Date: 2007-09-12
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the on-line descaling in the heat exchanger tube mainly includes spiral bond / sheet descaling, reciprocating coil spring descaling and rubber ball cleaning and descaling, etc., but these descaling methods have certain deficiencies that affect their use.
Spiral bond / sheet type descaling and reciprocating coil spring descaling methods need to hang and insert descaling objects in the heat exchange tube to affect the flow channel, the flow resistance is relatively large, and at the same time, the entrained substances in the fluid are easy to block the heat exchange tube
On-line rubber ball cleaning technology is widely used in power plant condensers, but the rubber balls currently used are microporous and soft elastomer structures. It is difficult to accurately control the wet diameter and specific gravity of the rubber balls during use, and it is also easy to Adhered by sludge, dirt and microorganisms, etc., resulting in unsatisfactory cleaning and descaling effects, low ball collection rate, easy to block pipes and other problems

Method used

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  • Member for online cleaning and removing scale of heat exchange tube
  • Member for online cleaning and removing scale of heat exchange tube
  • Member for online cleaning and removing scale of heat exchange tube

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] As shown in Figure 1, the present invention includes a hollow cylindrical density adjustment cavity 1, one end of the adjustment cavity 1 is closed, and the other end is sealed and connected to an end cover 2, and the connection between the end cover 2 and the adjustment cavity 1 can adopt an interference fit , can also be glued, and can also be connected by a barb connection or the like. An adjustment medium 3 is arranged in the cavity of the adjustment cavity 1, and four helical blades 4 are evenly arranged on the outer circumference of the adjustment cavity 1 with the axis of the adjustment cavity 1 as the axis of rotation. The helix angle of the helical blades 4 is β, four Each helical blade 4 and the largest outer contour of the regulating cavity 1 jointly form an approximately spherical spherical element, and the space between each helical blade 4 forms four helical flow channels 5 .

[0037] In this embodiment, the material for the helical blade 4 and the regulat...

Embodiment 2

[0045] As shown in Figure 9, the difference between this embodiment and Embodiment 1 is: the axis of rotation is a solid cylinder 17, that is, the axis of the solid cylinder 17 is the axis of rotation of the spherical cleaning and descaling element, and in the solid cylinder 17 Four helical blades 18 are uniformly arranged in the circumferential direction of the helical blade 18, and the helix angle β of the helical blades 18 is 60°, and the maximum outer contour of the four helical blades and the solid cylinder 17 is a spherical spherical element; four helical blades are formed between the four helical blades. A helical space is a helical fluid channel, and when the fluid flows through the helical channel, the spherical element of the present invention will be rotated rapidly. The main body material of this embodiment is non-foam rubber—butadiene rubber+styrene butadiene rubber. In order to improve or change the properties of rubber products (such as strength, density, wear r...

Embodiment 3

[0047] As shown in Figure 10, the present invention is formed by connecting four helical blades 19, and its connection mode is one-time molding or bonding, and the helix angle β of the helical blades is 45 °, and the maximum outer profile that four helical blades 19 form is Spherical spherical element, four helical blades 19 are evenly arranged in the circumferential direction. In this embodiment, the rotational axis of the spherical element is the symmetrical centerline of the four helical blades, and four helical spaces, namely the helical fluid, are formed between the four helical blades 19. channel, when the fluid flows through the spiral flow channel, the spherical cleaning and descaling element will be rotated rapidly. In this embodiment, no density adjustment cavity is provided, and its density is determined by the density of the material. Appropriate materials can be selected to ensure that its density is relatively close to the density of the transported fluid.

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Abstract

The invention discloses an element that heat exchange tube cleans and releases contaminant; it is characterized in that it includes a global element which has some. Roundness space of global element are separated by screwing or inclining heave to form the flow passages; The change of the global element's external diameter due to immergence is smaller than 2%, The of due to immergence is smaller than 5%, the error of the global element's density and transporting fluid's density is smaller than 10%. The most biggest outer contour of the element cleaning and releasing contaminant appears spherical or elliptical or appears approximate, possesses flow passages screwing or inclining to a rotating axis, when fluid flows in the flow passage, it drives the global element at liberty in the heat exchange tube prepared for cleaning and releasing contaminant. Therefore it has the characteristics in that the cleanout is effectual, flowing resistance is small and not apt to jam the heat exchange tube.

Description

technical field [0001] The invention relates to a cleaning and descaling element, in particular to an on-line cleaning and descaling element for heat exchange tubes which uses fluid motion as power to clean the heat exchange tubes. Background technique [0002] Shell-and-tube heat exchangers are widely used in electric power, chemical industry, petroleum and other industrial fields. Most of the heat exchangers have fouling and scaling during operation, especially the condensers cooled by circulating water. , water cooler, etc. The fouling and scaling of the heat exchanger will reduce the heat transfer coefficient of the equipment, increase the energy consumption, and even cause the equipment to fail to operate normally due to pipe blockage; scaling will also form corrosion under the scale and shorten the service life of the equipment. At present, there are online and off-line methods for cleaning and descaling in the heat exchange tubes of shell-and-tube heat exchangers. On...

Claims

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Application Information

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IPC IPC(8): F28G1/12
Inventor 孟继安
Owner TSINGHUA UNIV
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