Cleaning method and inspection method for heat exchanger, and cleaning equipment for heat exchanger

Patent metadata

Field	Value
Publication number	US-12013197-B2
Application number	US-202117800947-A
Country	US
Kind code	B2
Filing date	Feb 24, 2021
Priority date	Feb 27, 2020
Publication date	Jun 18, 2024
Grant date	Jun 18, 2024

Abstract

A cleaning method for a heat exchanger is a cleaning method for a heat exchanger which includes a header passage and a plurality of internal passages connected to the header passage, that includes: a step of supplying a cleaning fluid, via the header passage, to some of the plurality of internal passages connected to the header passage, selectively.

First claim

The invention claimed is:

1. A cleaning method for a heat exchanger which includes a header passage and a plurality of internal passages connected to the header passage, comprising:
wherein the plurality of internal passages are connected to the header passage at different positions in an extension direction of the header passage, respectively, and
supplying a cleaning fluid, via the header passage, to some of the plurality of internal passages connected to the header passage, selectively,
wherein supplying the cleaning fluid includes inserting into the header passage, a supply pipe which has an opening narrower than a connection area of the header passage where connections with the plurality of internal passages are arranged, and selectively supplying the cleaning fluid to the internal passages which have the connections located within a formation range of the opening, and
wherein a plurality of types of the supply pipe different in formation position of the opening in the extension direction are exchanged to sequentially change the internal passages to be supplied with the cleaning fluid.

2. The cleaning method for the heat exchanger according to claim 1 , comprising:
detecting a parameter indicating a pressure loss of the internal passages, while supplying a pressurized fluid from a supply line to the internal passages via the header passage; and
determining presence or absence of blockage in the internal passages based on a detection value of the parameter.

3. The cleaning method for the heat exchanger according to claim 2 ,
detecting the parameter indicating the pressure loss includes detecting a supply pressure of the cleaning fluid serving as the pressurized fluid, and
based on the supply pressure of the cleaning fluid, determining an end timing of the step of supplying the cleaning fluid.

4. A cleaning equipment for a heat exchanger, comprising:
a supply pipe which has an opening narrower than a connection area of a header passage where connections with a plurality of internal passages are arranged;
a supply line connected to the supply pipe; and
a boosting device for raising a pressure of a cleaning fluid supplied to the supply line;
wherein the supply pipe includes:
a supply pipe body which has a plurality of types of openings disposed at a plurality of positions in an extension direction of the header passage and at different circumferential positions; and
a sleeve into which the supply pipe body is slidably inserted and which has an opening over the entire connection area.

5. The cleaning equipment for the heat exchanger according to claim 4 , comprising:
a detection device for detecting a parameter indicating a pressure loss of the internal passages.

Assignees

• Mitsubishi Heavy Ind Ltd

Inventors

• Tanimoto Koichi
• Hara Nobuhide
• Nakaharai Hiroyuki
• Uefuji Yoichi
• Oda Takuo
• Eguchi Shunsaku
• Hatanaka Masaya

Classifications

• F28G15/003

  Control arrangements · CPC title

• B08B2209/032

  by the mechanical action of a moving fluid · CPC title

• B08B13/00

  Accessories or details of general applicability for machines or apparatus for cleaning · CPC title

• B08B9/0323

  Arrangements specially designed for simultaneous and parallel cleaning of a plurality of conduits · CPC title

• F28G1/163 Primary

  from internal surfaces of heat exchange conduits · CPC title