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Descaling device for steam generator

A technology of steam generator and scale, applied in steam generation, cleaning methods using liquid, chemical instruments and methods, etc., can solve the problems of expanding the cleaning range and difficult to clean nozzles, etc.

Inactive Publication Date: 2003-12-10
MITSUBISHI HEAVY IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0022] (3) The effective cleaning diameter of the water jet in the air is small, so it is difficult to expand the cleaning range with the cleaning nozzle incorporated in the spray gun

Method used

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  • Descaling device for steam generator
  • Descaling device for steam generator
  • Descaling device for steam generator

Examples

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Embodiment Construction

[0045] Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. In the drawings, elements that are the same as or correspond to elements in the above examples are identified by the same reference numerals. Furthermore, as can be seen from the following description, the present invention is not limited to the embodiment, but various modifications are possible.

[0046] In FIG. 1 , the main body part 2 shown is a scale removal device 50 for cleaning the part centered on the tube sheet according to the present invention. The tube sheet 3 has a large number of holes 3a into which the ends of the heat transfer tubes 5 are inserted and fixed therein in a watertight manner. In addition, in the main body portion 2, a pair of diametrically opposed circular probe holes or observation holes 2b (only one of them is shown) are formed relatively close to the upper surface of the tube sheet 3, and the scale removal device 50 ...

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PUM

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Abstract

A descaling device used to remove scales deposited on the inside of a shell and tube heat exchanger type steam generator, comprising a flexible lance which holds high-pressure water hose and is movable relative to tube plates, tube supporting plates, and heat-transfer pipes and a washing head installed at the tip of the flexible lance, wherein cavitation generating two nozzle holes communicating with the high-pressure water hoses are formed inside the washing head, whereby air bubbles are produced at the time of washing and an impact pressure produced when these bubbles burst is propagated so as to eliminate scales over a wide range.

Description

technical field [0001] The invention relates to a device for removing slag or scale, for example on the tube sheets and in the tube bundles of heat exchangers, such as steam generators used in nuclear power plants and the like. Background technique [0002] In order to understand the present invention, it is necessary to describe a steam generator used in a nuclear power plant or the like. Therefore, will refer to Figure 10 Give a brief description of the steam generator. [0003] exist Figure 10 In , reference numeral 1 designates the steam generating part of the steam generator. The steam generating part 1 has a substantially cylindrical body part 2, within which hand holes or observation holes (only one of which is identified with reference numeral 17) are symmetrically opposed to each other. In the lower part of the body part 2, a tube sheet 3 is arranged, which together with the bottom 2a of the body part 2 defines a water chamber 4. On this...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B08B3/02B08B3/10C02F1/00F22B37/47F22B37/48F28G1/16F28G9/00F28G13/00F28G15/04
CPCF22B37/475B08B3/102F28G1/166F28G13/00F22B37/483F28G9/00
Inventor 白石直市冈丈彦衣笠利行冈田英也中尾文俊
Owner MITSUBISHI HEAVY IND LTD
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