Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Foreign matter removnig device and method

A technology for foreign objects and blowing devices, applied in the field of scale skin devices, can solve the problems of pressure feeding rate limitation, long time, and increase in the appearance of abrasive equipment, and achieve constant flow rate, decompression/expansion compensation. Effect

Inactive Publication Date: 2004-01-28
MITSUBISHI HEAVY IND LTD
View PDF1 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for a specific portion where a large amount of scale is generated, the scale cannot be sufficiently removed
In order to remove a large amount of scale generated on the inner surface of the steel pipe, the amount of abrasive and the rate or speed at which the abrasive is sent by pressure must be increased, which brings about problems of increased appearance and cost of abrasive equipment
[0006] Also, due to the limitation of the amount of local thinning of the curved portion of each U-shaped tube, when the amount of scale is large, the amount of abrasive and the increase in the pressure-feeding rate of the abrasive using pressure may sometimes be limited
In this case, the descaling is done manually, which brings about the problem of extremely long time for this operation for heat exchangers with up to several thousand heat transfer tubes

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Foreign matter removnig device and method
  • Foreign matter removnig device and method
  • Foreign matter removnig device and method

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0052] figure 1 is a schematic diagram of a foreign object removing device according to a first embodiment of the present invention. figure 2 means along figure 1 A cross-section taken on the plane II-II, image 3 means along figure 1 A cross-section taken on plane III-III.

[0053] Such as Figures 1 to 3 As shown, the foreign matter removing apparatus of the first embodiment is used, for example, to abrade scale S as foreign matter generated in a pipe P used as a heat transfer tube of a heat exchanger of a nuclear power plant or the like. In particular, a large amount of scale S is generated in the area A near the opening of the pipe P. As shown in FIG.

[0054] For example, when, for example, the tube sheet is made of SUS304, and the heat transfer tube is made of copper-nickel alloy, a large thickness layer having a thickness of 70 to 100 micrometers is produced in the region where the tube sheet and the outlet portion of the heat transfer tube are interconnected , r...

no. 2 example

[0070] Figure 5 A foreign object removing device according to a second embodiment of the present invention is schematically illustrated. In the first embodiment described above, the abrasive aid 16 is inserted from one end and the abrasive is sent from the same end using pressure. However, in the second embodiment, as Figure 5 Insertion and transmission are performed from opposite ends as shown.

[0071] and figure 1 Similar to the shown apparatus, the foreign matter removing apparatus of the second embodiment is used to abrade scale S generated as foreign matter in a pipe P used as a heat transfer tube of a heat exchanger or the like.

[0072] In particular, if Figure 5 As shown, in the foreign object removing device of this second embodiment, similar to figure 1 , the retainer 11 is freely connectable / detachable to one open end of the pipe P, and the retainer 11 has a blowing path 13 and an engaging portion 12 whose interior is circular in cross-section. Also, anoth...

no. 3 example

[0078] Figure 6 A device for removing foreign objects according to a third embodiment of the present invention is schematically shown. and figure 1 Similarly, the foreign matter removing device of this third embodiment is also used to abrade scale S generated as foreign matter in the pipe P used as a heat transfer tube of a heat exchanger or the like.

[0079] In this third embodiment, if Figure 6 As shown, the abrasive is sent from the blast device 14a into the pipe P by pressure. In addition to this, abrasive material is also sent by means of pressure from a further blower device 14 into the interior of the abrasive aid 16 in a direction opposite to the flow direction of the abrasive material in the pipe P. Thus, the abrasive is ejected from the inside toward the periphery of the abrasive assisting part 16 .

[0080] In this foreign matter removing device, as a holding mechanism for holding the abrasive assisting member 16, the figure 1 Similarly, a holder 11, a suppo...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

Abstract

The present invention is one for providing an apparatus and a method which make it possible to remove a foreign object or matter such as scale attached on an inner surface of a pipe easily for a short period of time by means of simple equipment and manner, and constituted as follows. Specifically, a holder (11) is attached onto an end of a pipe (P), an abrasion assisting member (16) fixed to a tip end of a support arm (15) is inserted into the pipe (P) by use of the holder (11) and stopped at an area (A) where oxide scale (S) is generated in a large amount. Then abrasive is sent with pressure into the pipe (P) by a blast device (14), and thus a flow rate of the abrasive in the scale-abraded area (A) is increased to abrade and remove the oxide scale (S) securely. Moreover, if required, a spiral groove (17) is formed on an outer circumference of the abrasion assisting member (16) to increase centrifugal force of the abrasive.

Description

technical field [0001] The present invention relates to an apparatus and method for removing foreign matter or foreign matters such as scales adhering to the inner surfaces of small-diameter tubes such as heat transfer tubes or heat exchange tubes of heat exchangers and the inner surfaces of ordinary tubes. Background technique [0002] A heat exchanger is constructed, for example, in such a manner that a large number of heat transfer tubes are arranged in a casing to form a U shape, and are respectively connected to a lower inlet header and an upper outlet header. The inlet pipe is arranged on its upper part so as to communicate or connect with the shell, and the outlet pipe is arranged on its upper side wall so as to connect with the intermediate space. [0003] Therefore, for example, if cold water is supplied from the inlet header pipe to a large number of heat transfer tubes inside the shell, and at the same time, high-temperature air is supplied from the inlet pipe int...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): B08B9/04B24C3/32F28G1/16
CPCB24C3/325B08B9/057F28G1/163B24C1/086B24C3/32
Inventor 白石直吉田正敏熊田一德中川惠太松林诚松田光浩
Owner MITSUBISHI HEAVY IND LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com