EP2283971A1 - Procédé de détartrage et dispositif de détartrage - Google Patents

Procédé de détartrage et dispositif de détartrage Download PDF

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Publication number
EP2283971A1
EP2283971A1 EP09725423A EP09725423A EP2283971A1 EP 2283971 A1 EP2283971 A1 EP 2283971A1 EP 09725423 A EP09725423 A EP 09725423A EP 09725423 A EP09725423 A EP 09725423A EP 2283971 A1 EP2283971 A1 EP 2283971A1
Authority
EP
European Patent Office
Prior art keywords
steel pipe
pipe
pressure jet
blasting
nozzle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP09725423A
Other languages
German (de)
English (en)
Other versions
EP2283971A4 (fr
Inventor
Yoshiyuki Kuroiwa
Akihiro Sakamoto
Genji Morimoto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Steel Corp
Original Assignee
Sumitomo Metal Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sumitomo Metal Industries Ltd filed Critical Sumitomo Metal Industries Ltd
Publication of EP2283971A1 publication Critical patent/EP2283971A1/fr
Publication of EP2283971A4 publication Critical patent/EP2283971A4/fr
Withdrawn legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
    • B24C1/08—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for polishing surfaces, e.g. smoothing a surface by making use of liquid-borne abrasives
    • B24C1/086—Descaling; Removing coating films
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C3/00—Abrasive blasting machines or devices; Plants
    • B24C3/32—Abrasive blasting machines or devices; Plants designed for abrasive blasting of particular work, e.g. the internal surfaces of cylinder blocks
    • B24C3/325—Abrasive blasting machines or devices; Plants designed for abrasive blasting of particular work, e.g. the internal surfaces of cylinder blocks for internal surfaces, e.g. of tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C9/00—Appurtenances of abrasive blasting machines or devices, e.g. working chambers, arrangements for handling used abrasive material
    • B24C9/003—Removing abrasive powder out of the blasting machine

Definitions

  • the present invention relates to a scale removing method and scale removing apparatus wherein the internal surface of a steel pipe is subjected to blasting process where abrasive particles are ejected through a high-pressure jet nozzle and hit the internal surface of the steel pipe.
  • Steel pipes are often subjected to heat treatment depending on the usage purpose thereof.
  • a blasting has been known as the method for removing scale from the internal surface of steel pipe.
  • scale formed on the inner surfaces of steel pipe is removed by impacts of an abrasive particle such as iron, stainless steel, alumina, or quartz sand.
  • the blasting involves, for example, sand blasting, shot blasting, and grit blasting.
  • a high-pressure jet system, a negative-pressure suction system, or a combination of these two systems is adopted as the abrasive particle ejecting method.
  • a steel pipe is placed on turnable rollers, and while the steel pipe is rotated, a high-pressure jet nozzle is inserted from an end part of the steel pipe and is moved in the longitudinal direction with an abrasive particle blown onto the internal surface of steel pipe through the high-pressure jet nozzle, whereby scale is removed by impacts of the abrasive particle to the internal surface of steel pipe.
  • Dust particles after blasting are usually collected by a dust collector provided in an end part on the opposite side to the end part of steel pipe from which the high-pressure jet nozzle is inserted.
  • a suction machine is installed at one end of a steel pipe, and while the interior of steel pipe is maintained at a negative pressure by the suction machine, abrasive particles are charged from the other end in the state, whereby scale is removed by the impacts of the abrasive particle, moving in the steel pipe, to the internal surface of the steel pipe.
  • the blasting apparatus of high-pressure jet type has a disadvantage that a large equipment space is required because a pipe for transporting the abrasive particles to the nozzle (transportation pipe) has a long length.
  • the blasting apparatus of negative-pressure suction type has a disadvantage that the scale removing capability is low because the impact angle of abrasive particles is low.
  • Patent Document 1 In order to compensate for these disadvantages of the blasting apparatuses, in Patent Document 1, the present applicant disclosed an invention relating to scale removing equipment wherein: a first high-pressure jet blasting section for subjecting the internal surface of one pipe end part of a steel pipe to blasting; a second high-pressure jet blasting section for subjecting the internal surface of the other pipe end part of the steel pipe to blasting; and a negative-pressure suction blasting section for subjecting the internal surface of the overall length of steel pipe to blasting are arranged in juxtaposition, and steel pipe transfer devices are provided between these blasting sections.
  • scale formed near the end part of steel pipe which is less liable to be removed by the negative-pressure suction blasting, is removed by the high-pressure jet blasting.
  • blower used for the dust collector for high-pressure jet blasting a blower having a low capacity (usually, about 40 kW or lower) is used as compared with the blower used for the suction machine for negative-pressure suction blasting (90 kW or higher). The reason for this is as described below.
  • the suction machine for negative-pressure suction blasting must create a negative pressure in the steel pipe to produce an air flow sufficient to transport the abrasive particles, whereas in the high-pressure jet blasting, the abrasive particles are transported by the high-pressure jet nozzle, so that the purpose of the dust collector therefor is merely to collect dust particles (abrasive particles and chips thereof, removed scales, etc.).
  • Figure 4 shows a problem with a conventional high-pressure jet blasting method.
  • compressed air is sent from a compressor (not shown), and abrasive particles are supplied from an abrasive particles tank (not shown) to an abrasive particles transfer pipe 1, whereby high-pressure abrasive particles (not shown) is ejected through a nozzle 2.
  • a blower having a capacity corresponding to the flow rate at the nozzle 2 can be used.
  • the above-described gap is in a fixed range, the amount of air flowing into the steel pipe 3 increases beyond expectation, exceeding the suction capability of the dust collector 4, and dust particles 5 may scatter into the atmosphere.
  • the present invention has been made to solve the above problems, and accordingly an object thereof is to provide a scale removing method and scale removing apparatus wherein the ejector effect is reduced, and dust particles do not scatter into the atmosphere even with a low-capacity dust collector in high-pressure jet blasting.
  • the present invention has been made to solve the above problems, and the gist thereof is a scale removing method shown in item (1) and a scale removing apparatus shown in item (2).
  • any mode of items (a) to (c) described below is preferably adopted.
  • dust particles do not scatter into the atmosphere even with a low-capacity dust collector in high-pressure jet blasting, so that energy can be saved, and at the same time, the work environment can be improved.
  • a scale removing apparatus 7 in accordance with the present invention is a scale removing apparatus that performs blasting on the internal surface of a steel pipe 3 by causing abrasive particles (not shown) ejected through a high-pressure jet nozzle 2 to collide with the internal surface of the steel pipe 3.
  • the scale removing apparatus 7 has the high-pressure jet nozzle 2 for ejecting the abrasive particles, a dust collector 4 for collecting dust particles after blasting, and restraining means 6 for restraining air from flowing into the steel pipe 3 from an end part thereof due to the flow of abrasive particles ejected through the high-pressure jet nozzle 2.
  • FIG. 1 An example of a scale removing apparatus 7 in accordance with the present invention is shown in Figure 1 .
  • the dust collector 4 is installed so that dust particles can be collected from a pipe end (the right end part of the steel pipe 3 in Figure 1 ) on the opposite side to a nozzle insertion end (the left end part of the steel pipe 3 in Figure 1 ) of the high-pressure jet nozzle 2 of the steel pipe 3, and the restraining means 6 is formed of a plate material having a size capable of covering the nozzle insertion end (the left end part of the steel pipe 3 in Figure 1 ) of the high-pressure jet nozzle 2 of the steel pipe 3 and has a through hole where the high-pressure jet nozzle 2 can be slid.
  • FIG. 2 The other example of a scale removing apparatus 7 in accordance with the present invention is shown in Figure 2 .
  • the apparatus is the same as that shown in Figure 1 in that a dust collector 4 is installed so that dust particles can be collected from a pipe end (the right end part of a steel pipe 3 in Figure 2 ) on the opposite side to a nozzle insertion end (the left end part of the steel pipe 3 in Figure 2 ) of a high-pressure jet nozzle 2 of the steel pipe 3.
  • restraining means 6 is attached to the outer periphery of the high-pressure jet nozzle 2, and is formed of a disc-shaped plate material having an outside diameter equivalent to the inside diameter of the steel pipe 3 so as to be capable of sliding in the steel pipe 3.
  • restraining means 6 is installed at a pipe end (the right end part of a steel pipe 3 in Figure 3 ) on the opposite side to a nozzle insertion end (the left end part of the steel pipe 3 in Figure 3 ) of a high-pressure jet nozzle 2 of the steel pipe 3, a dust collector (not shown) is installed so that dust particles can be collected from the same pipe end as the nozzle insertion end (the left end part of the steel pipe 3 in Figure 3 ) of the high-pressure jet nozzle 2 of the steel pipe 3, and the restraining means 6 is formed of a plate material having a size capable of covering the end part of the steel pipe 3.
  • An expandable material such as rubber is desirably used as the restraining means.
  • the restraining means is not subject to any special restriction if it is configured so as to be capable of restraining air from flowing into the steel pipe from the end part of the steel pipe.
  • the size of the restraining means must be changed. Therefore, in the case where the size of steel pipe subjected to blasting changes frequently, it is desirable to use a plate material having a size far larger than the outside diameter of steel pipe as in the examples shown in Figures 1 and 3 .
  • the scale removing apparatus of the present invention is especially effective in removing scale at the pipe end of steel pipe by using the high-pressure jet nozzle.
  • the in-pipe air flow rate is 2 Nm 3 /min or lower, all dust particles produced at the time of blasting can be removed even with a low-capacity blower of 14.0 kW (diameter: 100 mm, 1750 rpm, -5000 mmAq).
  • the in-pipe air flow rate exceeds 5 Nm 3 /min, the above-described low-capacity blower is insufficient to collect dust, and dust particles are liable to scatter into the atmosphere. Therefore, the in-pipe air flow rate must be controlled so as to be 5 Nm 3 /min or lower, preferably 2 Nm 3 /min or lower.
  • the in-pipe air flow rate increases.
  • the in-pipe air flow rate can be kept at 5 Nm 3 /min or lower.
  • the in-pipe air flow rate exceeds 5 Nm 3 /min.
  • the in-pipe air flow rate increases.
  • the in-pipe air flow rate can be kept at 5 Nm 3 /min or lower.
  • the in-pipe air flow rate exceeds 5 Nm 3 /min.
  • the in-pipe air flow rate did not increase so much, and in any examples, the in-pipe air flow rate could be kept at 5 Nm 3 /min or lower.
  • the experiment was conducted by providing a restraining plate, serving as the restraining means, having a size larger than the inside diameter of steel pipe at a position near the pipe end on the nozzle insertion side and by variously changing a distance "a" between the pipe end and the restraining plate.
  • the in-pipe flow rate is an average value of flow rates at one point at the circle central portion at the pipe end on the dust collector connection side and at four points in the circumferential portion, that is, at five points indicated by black dots in Figure 8 .
  • Figure 9 shows the relationship between the ratio of distance "a" to nozzle diameter (hereinafter, referred to as a "position index X”) and the ratio of in-pipe flow rate to jet flow rate (hereinafter, referred to as a "flow rate index Y").
  • position index X the ratio of distance "a" to nozzle diameter
  • flow rate index Y the ratio of in-pipe flow rate to jet flow rate
  • dust particles do not scatter into the atmosphere even with a low-capacity dust collector in high-pressure jet blasting, so that energy can be saved and the work environment can be improved.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Cleaning In General (AREA)
EP09725423.9A 2008-03-26 2009-03-24 Procédé de détartrage et dispositif de détartrage Withdrawn EP2283971A4 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2008079439 2008-03-26
PCT/JP2009/055744 WO2009119540A1 (fr) 2008-03-26 2009-03-24 Procédé de détartrage et dispositif de détartrage

Publications (2)

Publication Number Publication Date
EP2283971A1 true EP2283971A1 (fr) 2011-02-16
EP2283971A4 EP2283971A4 (fr) 2014-03-19

Family

ID=41113732

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09725423.9A Withdrawn EP2283971A4 (fr) 2008-03-26 2009-03-24 Procédé de détartrage et dispositif de détartrage

Country Status (6)

Country Link
US (1) US20110065363A1 (fr)
EP (1) EP2283971A4 (fr)
JP (1) JP4400761B2 (fr)
CN (1) CN101980834A (fr)
BR (1) BRPI0910400A8 (fr)
WO (1) WO2009119540A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8801499B2 (en) * 2009-04-21 2014-08-12 Sharp Kabushiki Kaisha Blasting apparatus and method for blast processing
US9085064B2 (en) * 2010-09-09 2015-07-21 Envirologics Engineering Inc. System for dispensing abrasives into a gas stream for cleaning pipe interiors
CN102806328A (zh) * 2011-06-02 2012-12-05 江苏永钢集团有限公司 一种钢坯表面氧化铁吹扫装置
DE102014102147B4 (de) * 2014-02-19 2017-03-09 Wheelabrator Group Gmbh Verfahren zum Verfestigungsstrahlen einer Rohrinnenwandung eines gekrümmtenWerkstücks mit einer Werkstückbohrung sowie Strahldüseneinheitund Arbeitskammersystem dafür
US10435779B2 (en) * 2017-03-14 2019-10-08 Ford Motor Company Precision air flow routing devices and method for thermal spray coating applications

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2572965A1 (fr) * 1984-11-09 1986-05-16 Framatome Sa Procede et dispositif de mise en compression par martelage d'un tube de generateur de vapeur serti dans une plaque tubulaire
JPH05228841A (ja) * 1992-02-13 1993-09-07 Mitsubishi Materials Corp 管内面ブラスト装置
JPH06270065A (ja) * 1993-03-23 1994-09-27 Kawasaki Steel Corp 鋼管内面のブラスト方法
EP1415763A1 (fr) * 2001-08-08 2004-05-06 Mitsubishi Heavy Industries, Ltd. Dispositif et procede de suppression de corps etrangers

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3835587A (en) * 1973-07-03 1974-09-17 W Hall Pipe cleaning apparatus and method
US5160548A (en) * 1991-09-09 1992-11-03 Ohmstede Mechanical Services, Inc. Method for cleaning tube bundles using a slurry
US5664992A (en) * 1994-06-20 1997-09-09 Abclean America, Inc. Apparatus and method for cleaning tubular members
JP3533942B2 (ja) 1998-05-08 2004-06-07 住友金属工業株式会社 スケール除去方法及び設備
JP4052424B2 (ja) * 2001-07-03 2008-02-27 三菱重工業株式会社 異物除去装置及び方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2572965A1 (fr) * 1984-11-09 1986-05-16 Framatome Sa Procede et dispositif de mise en compression par martelage d'un tube de generateur de vapeur serti dans une plaque tubulaire
JPH05228841A (ja) * 1992-02-13 1993-09-07 Mitsubishi Materials Corp 管内面ブラスト装置
JPH06270065A (ja) * 1993-03-23 1994-09-27 Kawasaki Steel Corp 鋼管内面のブラスト方法
EP1415763A1 (fr) * 2001-08-08 2004-05-06 Mitsubishi Heavy Industries, Ltd. Dispositif et procede de suppression de corps etrangers

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO2009119540A1 *

Also Published As

Publication number Publication date
BRPI0910400A2 (pt) 2015-09-29
US20110065363A1 (en) 2011-03-17
BRPI0910400A8 (pt) 2019-01-29
EP2283971A4 (fr) 2014-03-19
JP4400761B2 (ja) 2010-01-20
CN101980834A (zh) 2011-02-23
JPWO2009119540A1 (ja) 2011-07-21
WO2009119540A1 (fr) 2009-10-01

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