EP0186756A1 - Combustion en lit fluidisé avec des surfaces de chauffe immergées - Google Patents

Combustion en lit fluidisé avec des surfaces de chauffe immergées Download PDF

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Publication number
EP0186756A1
EP0186756A1 EP85114126A EP85114126A EP0186756A1 EP 0186756 A1 EP0186756 A1 EP 0186756A1 EP 85114126 A EP85114126 A EP 85114126A EP 85114126 A EP85114126 A EP 85114126A EP 0186756 A1 EP0186756 A1 EP 0186756A1
Authority
EP
European Patent Office
Prior art keywords
fluidized bed
heating surfaces
immersion heating
pins
fins
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.)
Granted
Application number
EP85114126A
Other languages
German (de)
English (en)
Other versions
EP0186756B1 (fr
Inventor
Josef Dr. Rer. Nat. Langhoff
Hermann Krischke
Hord Geldmacher
Manfred Golomb
Karl-Heinz Kamp
Peter Masuch
Rolf Chalupnik
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.)
RAG AG
Original Assignee
Ruhrkohle AG
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6253743&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0186756(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Ruhrkohle AG filed Critical Ruhrkohle AG
Publication of EP0186756A1 publication Critical patent/EP0186756A1/fr
Application granted granted Critical
Publication of EP0186756B1 publication Critical patent/EP0186756B1/fr
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B31/00—Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements of dispositions of combustion apparatus
    • F22B31/0007—Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements of dispositions of combustion apparatus with combustion in a fluidized bed
    • F22B31/0061—Constructional features of bed cooling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B37/00—Component parts or details of steam boilers
    • F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
    • F22B37/10—Water tubes; Accessories therefor
    • F22B37/101—Tubes having fins or ribs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B37/00—Component parts or details of steam boilers
    • F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
    • F22B37/10—Water tubes; Accessories therefor
    • F22B37/106—Studding of tubes

Definitions

  • the invention relates to a fluidized bed furnace for steam and / or hot water and / or hot air generation with immersion heating surfaces arranged in the fluidized bed.
  • Coal mixed with fine-grained sand, lime and ash particles, is burned in the fluidized bed furnace in the state of suspension.
  • the kettle has one or more vertebral cells.
  • the combustion air is introduced into the cell via a nozzle base and sets the material in a swirling movement.
  • Steam or hot water pipes are immersed in the fluidized bed, which absorb up to 50% of the heat introduced and thereby keep the bed temperature low. Thanks to the vortex movement, the heat transfer to these pipes is very high.
  • There is a free space above the fluidized bed which is used for afterburning. From the free space, the flue gases reach a convection part like a boiler of the usual type.
  • the combustion temperature is between 800 and 900 ° C. At this temperature, the sulfur contained in the coal combines with limestone. This creates a dry, inert waste product (mainly gypsum) that can be deposited together with the ash. This process binds 80 to 90% of the sulfur contained in the coal.
  • NO x emissions are greatly reduced due to the low combustion temperatures.
  • the environmental impact of gaseous pollutants is significantly lower with fluidized bed firing than with other types of firing.
  • the dusty substances are retained in a cyclone separator with a downstream cloth filter.
  • Another advantage of fluidized bed combustion is that coal of various qualities, including those with a high ash content, can be burned without any problems.
  • a disadvantage of fluidized bed firing is the low boiler output per unit volume. This applies to atmospheric boiler operation.
  • the current development is towards an increase in performance by so-called pressure-charged fluidized bed operation or by means of a circulating fluidized bed.
  • the pressure-charged fluidized bed is operated with a significantly higher pressure than the atmosphere.
  • bubble formation which is known with atmospheric fluidized beds, is intensified. Bubbles rise in the fluidized bed, which significantly disturb the fluidized bed. The rising bubbles can cause a. an undesirable throwing up of the solid particles from the fluidized bed beyond the zone of the afterburning into the downstream filter.
  • the circulating fluidized bed does not go the way to prevent the discharge, but promotes the discharge.
  • recycling of unburned solid particles is also ensured. I.e. the solid particles are circulated in a whirling motion.
  • the object of the invention is to reduce such erosions.
  • this is achieved in that flow-breaking baffles are arranged on the immersion heating surfaces.
  • the baffles according to the invention impair the flow on the immersion heating surfaces. I.e. the particle speed on the immersion heating surfaces is considerably reduced, while on the baffles according to the invention. Intense turbulence arises, which ensures excellent heat transfer to the chicans and, through the chicanes, to the immersion heating surfaces. Accordingly, the immersion heating surfaces are connected to the baffles in a manner known per se.
  • Pins or fins are preferably provided as baffles according to the invention.
  • the fins are distributed around the circumference of the immersion heating surfaces and extend in the longitudinal direction of the immersion heating surfaces. Applied to tube-like immersion heating surfaces, this means that the fins extend over the entire length of the tubes if possible.
  • the fins have a web height of at least 5 mm. At least 3 fins are preferably distributed around the circumference of the immersion heating surfaces.
  • the pins When using pins as the flow-breaking baffles according to the invention, the pins have a length of at least 10 mm and at least 850 pins per m 2 are arranged.
  • the pin diameter is at least 5 mm.
  • a pinned cooling tube 1 is shown schematically.
  • the cooling tube 1 is part of a heat exchanger immersed in the fluidized bed of a fluidized bed combustion plant for coal.
  • the cooling tube 1 has an outer diameter of 57 mm with a wall thickness of 6.3 mm and is provided with pins 2 on the circumference.
  • the pins 2 are arranged evenly distributed on the circumference.
  • Eight pins are arranged in one level. Two adjacent planes are - as shown in FIGS. 1 and 1b based on sections along the lines A-A and B-B - offset by 22.5 ° to each other. In each plane, the pins 2 are each offset by 45 ° to one another.
  • the diameter of the pins is 10 mm and their length is 15 mm. The arrangement of the pins shown in FIGS. 1 to 1b continues over the entire tube length immersed in the fluidized bed.
  • the distance between the individual rows of pins is selected so that a perfect weld connection is guaranteed.
  • the described arrangement of the pins on the outer surface lying in the fluidized bed inventory influences the edge flow in the fluidized state in such a way that the main mechanical stress caused by the fluidized bed inventory acts on the pins and is kept away from the tube surface.
  • fins 4 with a width of 5 mm and a height of 10 mm are arranged on the circumference of a cooling tube 3 with the same dimensions as the cooling tube 1 at an angle of 45 ° to the vertical and at a distance of 90 ° so that the circumference is from below incoming flow is deflected so that the main mechanical stress from the fluidized bed inventory acts on the fins and is kept away from the pipe surface.
  • three fins 6 are provided on a cooling tube 5 with the same dimensions as the cooling tube 1. However, the fins 6 are located on the part of the cooling tube circumference facing the flow. One fin 6 is located at the stagnation point, the other two are on the left and right side and at an angle of 60 °.
  • the flow direction of the counter the cooling pipe 5 flowing particles is denoted by 7 in FIG. The direction of flow is identical to the direction of flow in the other exemplary embodiments of the invention.
  • fins with different dimensions and / or different angles can be welded onto the tube.
  • the pins or fins welded onto the cooling pipes 1, 3 or 5 advantageously enlarge the surface involved in the heat exchange.
  • the number of immersion heating surface pipes can be reduced by a corresponding amount.
  • the immersion heating surfaces according to the invention are suitable for atmospheric, circulating or also pressure-charged fluidized bed combustion.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Fluidized-Bed Combustion And Resonant Combustion (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Crucibles And Fluidized-Bed Furnaces (AREA)
EP85114126A 1984-12-22 1985-11-06 Combustion en lit fluidisé avec des surfaces de chauffe immergées Expired EP0186756B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3447186 1984-12-22
DE3447186A DE3447186A1 (de) 1984-12-22 1984-12-22 Wirbelschichtfeuerung mit tauchheizflaechen

Publications (2)

Publication Number Publication Date
EP0186756A1 true EP0186756A1 (fr) 1986-07-09
EP0186756B1 EP0186756B1 (fr) 1989-04-05

Family

ID=6253743

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85114126A Expired EP0186756B1 (fr) 1984-12-22 1985-11-06 Combustion en lit fluidisé avec des surfaces de chauffe immergées

Country Status (9)

Country Link
US (1) US4715809A (fr)
EP (1) EP0186756B1 (fr)
JP (1) JPS61159002A (fr)
AU (1) AU580118B2 (fr)
BR (1) BR8506385A (fr)
CA (1) CA1265390A (fr)
DE (2) DE3447186A1 (fr)
PL (1) PL256476A1 (fr)
ZA (1) ZA859803B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0263651A2 (fr) * 1986-10-08 1988-04-13 Dorr-Oliver Incorporated Appareil à réduire ou à éliminer l'érosion des tubes dans un lit fluidisé
AU639685B2 (en) * 1989-02-13 1993-08-05 Foster Wheeler Energia Oy Waterwalls in a fluidized bed reactor

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI84202C (fi) * 1989-02-08 1991-10-25 Ahlstroem Oy Reaktorkammare i en reaktor med fluidiserad baedd.
DE19809859A1 (de) * 1998-03-07 1999-09-09 Mann & Hummel Filter Vorrichtung zur Kühlung von Gasen
US7096931B2 (en) * 2001-06-08 2006-08-29 Exxonmobil Research And Engineering Company Increased heat exchange in two or three phase slurry
JP5073895B2 (ja) * 2001-09-25 2012-11-14 オリンパス株式会社 内視鏡用処置具
DE102008061743B4 (de) 2008-12-12 2014-12-04 Outotec Oyj Verfahren zur Herstellung eines hydraulisch wirkenden Produkts
US10480862B2 (en) 2013-05-23 2019-11-19 Crc-Evans Pipeline International, Inc. Systems and methods for use in welding pipe segments of a pipeline
US10589371B2 (en) 2013-05-23 2020-03-17 Crc-Evans Pipeline International, Inc. Rotating welding system and methods
US9821415B2 (en) * 2014-03-28 2017-11-21 Crc-Evans Pipeline International, Inc. Internal pipeline cooler
US10695876B2 (en) 2013-05-23 2020-06-30 Crc-Evans Pipeline International, Inc. Self-powered welding systems and methods
US11767934B2 (en) 2013-05-23 2023-09-26 Crc-Evans Pipeline International, Inc. Internally welded pipes
US10040141B2 (en) 2013-05-23 2018-08-07 Crc-Evans Pipeline International, Inc. Laser controlled internal welding machine for a pipeline
CA2956318C (fr) 2014-08-29 2022-11-29 Shankar Rajagopalan Procede et systeme de soudage
US11458571B2 (en) 2016-07-01 2022-10-04 Crc-Evans Pipeline International, Inc. Systems and methods for use in welding pipe segments of a pipeline
US20230126484A1 (en) * 2021-10-21 2023-04-27 General Electric Company Thermal device
CN116221690A (zh) * 2023-04-28 2023-06-06 沈阳世杰电器有限公司 一种基于分时电价差异的用户端热电解耦系统

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3310037A (en) * 1965-10-23 1967-03-21 Babcock & Wilcox Co Vapor generating apparatus
US3375089A (en) * 1964-06-23 1968-03-26 Steinmueller Gmbh L & C Steel studs
DE2003062A1 (de) * 1969-01-24 1970-07-30 Asahi Glass Co Ltd Wirbelschichtreaktor
DE2724336B1 (de) * 1977-05-28 1978-07-27 Didier Werke Ag Rohrheizflaechenwand mit Stiften
US4124068A (en) * 1977-05-16 1978-11-07 Uop Inc. Heat exchange tube for fluidized bed reactor
US4226584A (en) * 1979-04-02 1980-10-07 O'connor Engineering Laboratories, Inc. Rotary combustor wall
DE3347083A1 (de) * 1983-12-24 1985-07-04 Vereinigte Kesselwerke AG, 4000 Düsseldorf Tauchheizflaechen fuer eine wirbelschichtfeuerung
US4554967A (en) * 1983-11-10 1985-11-26 Foster Wheeler Energy Corporation Erosion resistant waterwall

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL234992A (fr) * 1958-01-10
GB1494996A (en) * 1973-12-17 1977-12-14 Babcock & Wilcox Ltd Fluidised bed combustion system
DE3163732D1 (en) * 1980-06-14 1984-06-28 Bergwerksverband Gmbh Process and device for introducing bulk material into fluidized-bed reactors
DE3221567A1 (de) * 1982-06-08 1983-12-08 Bergwerksverband Gmbh, 4300 Essen Wirbelschichtofen

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3375089A (en) * 1964-06-23 1968-03-26 Steinmueller Gmbh L & C Steel studs
US3310037A (en) * 1965-10-23 1967-03-21 Babcock & Wilcox Co Vapor generating apparatus
DE2003062A1 (de) * 1969-01-24 1970-07-30 Asahi Glass Co Ltd Wirbelschichtreaktor
US4124068A (en) * 1977-05-16 1978-11-07 Uop Inc. Heat exchange tube for fluidized bed reactor
DE2724336B1 (de) * 1977-05-28 1978-07-27 Didier Werke Ag Rohrheizflaechenwand mit Stiften
US4226584A (en) * 1979-04-02 1980-10-07 O'connor Engineering Laboratories, Inc. Rotary combustor wall
US4554967A (en) * 1983-11-10 1985-11-26 Foster Wheeler Energy Corporation Erosion resistant waterwall
DE3347083A1 (de) * 1983-12-24 1985-07-04 Vereinigte Kesselwerke AG, 4000 Düsseldorf Tauchheizflaechen fuer eine wirbelschichtfeuerung

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0263651A2 (fr) * 1986-10-08 1988-04-13 Dorr-Oliver Incorporated Appareil à réduire ou à éliminer l'érosion des tubes dans un lit fluidisé
EP0263651A3 (en) * 1986-10-08 1988-08-10 Dorr-Oliver Incorporated Apparatus to reduce or eliminate fluid bed tube erosion
AU597426B2 (en) * 1986-10-08 1990-05-31 Dorr-Oliver Incorporated Apparatus to reduce or eliminate fluid bed tube erosion
AU639685B2 (en) * 1989-02-13 1993-08-05 Foster Wheeler Energia Oy Waterwalls in a fluidized bed reactor

Also Published As

Publication number Publication date
PL256476A1 (en) 1986-09-23
AU580118B2 (en) 1989-01-05
US4715809A (en) 1987-12-29
CA1265390A (fr) 1990-02-06
DE3569283D1 (en) 1989-05-11
AU5076085A (en) 1986-06-26
EP0186756B1 (fr) 1989-04-05
BR8506385A (pt) 1986-09-02
DE3447186A1 (de) 1986-07-03
ZA859803B (en) 1986-11-26
JPS61159002A (ja) 1986-07-18

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