EP0168511B1 - Method of manufacturing a combustor nozzle - Google Patents

Method of manufacturing a combustor nozzle Download PDF

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Publication number
EP0168511B1
EP0168511B1 EP19840108348 EP84108348A EP0168511B1 EP 0168511 B1 EP0168511 B1 EP 0168511B1 EP 19840108348 EP19840108348 EP 19840108348 EP 84108348 A EP84108348 A EP 84108348A EP 0168511 B1 EP0168511 B1 EP 0168511B1
Authority
EP
European Patent Office
Prior art keywords
nose
alloy
covering layer
mold
set forth
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.)
Expired
Application number
EP19840108348
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0168511A1 (en
Inventor
Makoto Hiroshima Technical Institute Tsunoi
Toshio Hiroshima Technical Institute Kai
Daisaku Hiroshima Technical Institute Shozen
Tatsuo Hiroshima Technical Institute Morimoto
Ikuo Hiroshima Shipyard & Engine Works Inoue
Katsuo C/O Yokkaichi Divison Jindo
Tetsuya c/o Yokkaichi Division Sato
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.)
Mitsubishi Heavy Industries Ltd
Original Assignee
Mitsubishi Heavy 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
Priority to JP5101583A priority Critical patent/JPS59179898A/ja
Application filed by Mitsubishi Heavy Industries Ltd filed Critical Mitsubishi Heavy Industries Ltd
Priority to DE8484108348T priority patent/DE3467107D1/de
Priority to DE1984108348 priority patent/DE168511T1/de
Priority to EP19840108348 priority patent/EP0168511B1/en
Publication of EP0168511A1 publication Critical patent/EP0168511A1/en
Application granted granted Critical
Publication of EP0168511B1 publication Critical patent/EP0168511B1/en
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D19/00—Casting in, on, or around objects which form part of the product

Definitions

  • This invention relates to a method of manufacturing a combustor nozzle with a layer of corrosion resistant alloy at the nose of the nozzle body.
  • a combustor in, for example, a gasifying plant for producing hydrogen by the partial oxidation of hydrocarbon has a nose covered by a heat resistant alloy, since it is exposed to a high temperature up to, say, 800°C and liable to wear by gas or dust, or corrosion by impurities in fuel.
  • a typical nose construction is shown in Figure 1.
  • a nose 1 terminates in a covering layer 2.
  • a nozzle gun 3 is provided for supplying hydrocarbon.
  • the nose 1 and the gun 3 defines therebetween a clearance 4 through which oxygen is supplied for the partial oxidation of the hydrocarbon.
  • the nose 1 is provided with a water cooler 5.
  • the covering layer 2 has hitherto been formed by one of the following methods:
  • a plurality of layers of, for example, a nickel-based corrosion resistant alloy such as Hastelloy X or a cobalt-based corrosion resistant alloy such as Stellite are welded to the nose and machined appropriately.
  • a heat resistant ceramic material is spray coated on the tip of the nose.
  • the ceramics are greatly lower than the nose material and inferior in resistance to thermal impact. It is, therefore, likely that the covering layer may quickly crack and peel off the nose material.
  • the low alloy steel is lower in hardness at a high temperature than the nickel- or cobalt-based heat resistant alloy. If no covering layer is provided, therefore, the nose is liable to wear by fuel gas or dust.
  • the nose of a combustor is easily influenced by a temperature change which may result from a change in the supply of fuel and the shape of the flame thereby formed. It is liable to wear or corrosion by the dust in the fuel or the fuel gas itself. Moreover, insofar as it is one of the essential members of an integral plant, it is required to have a certain length of guaranteed life (e.g. six months), since any trouble that it may have between regular inspections or repairs interrupts the operation of the plant and brings about a reduction in production. Under these circumstances, the following characteristics are, among others, required of the nose of the combustor:
  • This object is attained by a method which is characterized by preparing a mold from a material that is to form a nozzle body casting an alloy into said mold to form a covering layer, and machining the resulting combination of said material and said alloy into a predetermined nozzle shape in which said covering layer covers the nose of said nozzle body.
  • the method of this invention provides the following advantages, among others:
  • the method of this invention is applicable to the manufacture of not only the nose of a combustor for a hydrogen producing plant, but also for the noses of a variety of other types of combustor nozzles.
  • FIG. 2A to 2C of the drawings there are shown a series of steps for manufacturing in accordance with this invention the nose of a combustor for a hydrogen producing plant.
  • a mold 11 is preheated in an electric furnace 13 in the presence of a reducing molten flux 12 which prevents the oxidation of the inner surface of the mold 11, as shown in Figure 2A.
  • Anhydrous sodium borate may be used as the flux.
  • a heat resistant alloy 15, which is used to form a covering layer, is melted in a high frequency induction furnace 14, and the molten alloy is poured into the mold 11, as shown in Figure 2B.
  • the mold 11 may be formed from 1.25Cr-0.5Mo steel, and the alloy 15 may be a nickel-based heat resistant alloy.
  • the assembly of the mold 11 and the alloy 15 is machined into a predetermined shape to yield a product 17 carrying a covering layer 17A composed of the heat resistant alloy, as shown in Figure 2C.
  • the product 17 is obtained by removing the alloy from an area 16 and the mold material from areas 18.
  • Table 1 compares in chemical composition several noses made by a conventional welding method and several noses made by the method of this invention which is shown in Figures 2A to 2C. It is obvious from Table 1 that the products of this invention showed a normal range of composition at a distance of only 0.1 mm from the interface between the nose body and the covering layer, while the conventionally welded products showed a change in composition at a depth up to about 2 mm.
  • the products were also tested for oxidation resistance.
  • the covering layer was partly removed to leave a thickness of 1 mm from the interface, and heated at 1000°C for 400 hours intermittently on a cycle of 15 hours of heating and five hours of cooling.
  • the products were, then, tested for loss by corrosion.
  • a bare product not having any covering layer was also tested in the same way. The results are shown in Table 2. As is obvious therefrom, the product of this invention showed a drastically smaller amount of loss by corrosion than the conventional products.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
  • Coating By Spraying Or Casting (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)
EP19840108348 1983-03-26 1984-07-16 Method of manufacturing a combustor nozzle Expired EP0168511B1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP5101583A JPS59179898A (ja) 1983-03-26 1983-03-26 紙サイズ剤
DE8484108348T DE3467107D1 (en) 1984-07-16 1984-07-16 Method of manufacturing a combustor nozzle
DE1984108348 DE168511T1 (de) 1984-07-16 1984-07-16 Herstellungsverfahren fuer verbrennerduese.
EP19840108348 EP0168511B1 (en) 1983-03-26 1984-07-16 Method of manufacturing a combustor nozzle

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP5101583A JPS59179898A (ja) 1983-03-26 1983-03-26 紙サイズ剤
EP19840108348 EP0168511B1 (en) 1983-03-26 1984-07-16 Method of manufacturing a combustor nozzle

Publications (2)

Publication Number Publication Date
EP0168511A1 EP0168511A1 (en) 1986-01-22
EP0168511B1 true EP0168511B1 (en) 1987-11-04

Family

ID=26091991

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19840108348 Expired EP0168511B1 (en) 1983-03-26 1984-07-16 Method of manufacturing a combustor nozzle

Country Status (2)

Country Link
EP (1) EP0168511B1 (enrdf_load_stackoverflow)
JP (1) JPS59179898A (enrdf_load_stackoverflow)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0633598B2 (ja) * 1984-11-16 1994-05-02 三菱石油株式会社 製紙用サイズ剤
JPS61160495A (ja) * 1984-12-28 1986-07-21 三菱化成ポリテック株式会社 製紙用サイズ剤
JPS61160496A (ja) * 1984-12-28 1986-07-21 三菱化成ポリテック株式会社 サイズ紙を製造する方法
JPH08113892A (ja) 1994-10-14 1996-05-07 Mitsubishi Oil Co Ltd アルケニルコハク酸系エマルションサイズ剤

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE548717C (de) * 1930-05-11 1932-04-18 Georg Pemetzrieder Verfahren zur Herstellung von Verbundgusskoerpern
GB1216766A (en) * 1967-07-01 1970-12-23 Kubota Iron & Machinery Works Improvements in and relating to the centrifugal casting of composite metal bodies
US4352675A (en) * 1979-11-30 1982-10-05 Ruhrkohle Aktiengesellschaft Coal gasification reactor
JPS59144696A (ja) * 1983-02-07 1984-08-18 荒川化学工業株式会社 紙サイズ剤

Also Published As

Publication number Publication date
JPH0453995B2 (enrdf_load_stackoverflow) 1992-08-28
EP0168511A1 (en) 1986-01-22
JPS59179898A (ja) 1984-10-12

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