WO1984002571A2 - Heating apparatus - Google Patents

Heating apparatus Download PDF

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Publication number
WO1984002571A2
WO1984002571A2 PCT/GB1983/000345 GB8300345W WO8402571A2 WO 1984002571 A2 WO1984002571 A2 WO 1984002571A2 GB 8300345 W GB8300345 W GB 8300345W WO 8402571 A2 WO8402571 A2 WO 8402571A2
Authority
WO
WIPO (PCT)
Prior art keywords
furnace
heat exchanger
tubes
heating apparatus
gas
Prior art date
Application number
PCT/GB1983/000345
Other languages
French (fr)
Other versions
WO1984002571A3 (en
WO1984002571A1 (en
Inventor
Cedric Richard Jones
Original Assignee
Flexifuel Technology 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 Flexifuel Technology Ltd filed Critical Flexifuel Technology Ltd
Priority to AU24335/84A priority Critical patent/AU2433584A/en
Publication of WO1984002571A2 publication Critical patent/WO1984002571A2/en
Publication of WO1984002571A1 publication Critical patent/WO1984002571A1/en
Publication of WO1984002571A3 publication Critical patent/WO1984002571A3/en

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27FURNACES; KILNS; OVENS; RETORTS
    • F27DDETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/004Systems for reclaiming waste heat
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P80/00Climate change mitigation technologies for sector-wide applications
    • Y02P80/10Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
    • Y02P80/15On-site combined power, heat or cool generation or distribution, e.g. combined heat and power [CHP] supply

Landscapes

  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Fluidized-Bed Combustion And Resonant Combustion (AREA)

Abstract

A solid fuel fired heating apparatus comprises a furnace (1) and a heat exchanger (4) to which exhaust gases from the furnace are passed. In order to increase the efficiency of the apparatus a particle separator (5) is interposed between the furnace and the heat exchanger to clean the exhaust gases. Thereby, smaller bore tubes or retarders, such as coils, can be used in the heat exchanger without the risk of the tubes or coils becoming clogged and erosion of the tubes by the particles is reduced or eliminated. The invention is also applicable to other process heating where clean gases are required for dryers, furnaces or other heating processes.

Description


  
 



   HEATING APPARATUS
 This invention relates to solid fuel fired heating apparatus.



   Known heating apparatus comprise a furnace, which may be fired by oil, gas or solid fuel, and a heat exchanger. In a known shell boiler, for example, there is an inner cylindrical furnace co-axial with an outer shell, the space between the furnace and the shell incorporating the heat exchanger and containing a plurality of heat exchanging tubes through which hot combustion gas from the furnace is directed. The direction of gas flow usually has to change between the furnace and the heat exchanger and the tubes may have one or more passes requiring the airflow to change from one direction to the opposite direction. With relatively clean gases from gas and oil fired boilers the reversal of the gas causes few problems, but with coal fired furnaces the hot gas contains particles of ash and unburnt coal which can cause severe erosion of the boiler tube ends and tube bores.

  As a result the boiler tubes have to be frequently replaced. Furthermore, to increase the efficiency of the heat exchanger it is common to install a larger number of smaller  bore tubes, or insert retarders, such as coils, within the tubes. However, with a solid fuel fired unit, small bore tubes or tubes with retarders would become clogged and eroded by the particles in the gas. This results in solid fuel fired boilers having a greater physical size and consequently being more expensive than gas or oil fired boilers of comparable duties.



   Other kinds of heating apparatus, for example socalled "water-tube" or   "composite"    boilers may have the same problems as discussed above.



   For many years attempts have been made to solve the problems associated with solid fuel fired heating apparatus, both to increase their efficiency and permit a reduction in the size of the apparatus and to increase their versatility of application, that is to make them more suitable for a wider range of applications,   part-    icularly in industry. One such attempt has been made to increase the efficiency of a solid fuel fired boiler. In such a boiler the furnace is surrounded by outer water tubes and the heated water from the tubes and the exhaust gases from the furnace both pass to a second stage heat exchanger. Such a boiler does not, however, operate entirely satisfactorily.



   The aim of the present invention is to provide a solid fuel fired heating apparatus which overcomes the above-mentioned problems.



   In accordance with the invention, there is provided a heating apparatus comprising a furnace, a heat exchanger to which exhaust gases can pass from the furnace, and a particle separating means which is arranged to separate particles from the exhaust gas stream passing from the furnace to the heat exchanger.



   Preferably, the particle separating means is a cyclonic separator designed to operate at the high temperatures of furnace exhaust gases.



   Some forms of solid fuel fired heating apparatus in accordance with the invention will now be described  by way of example, with reference to the accompanying drawings, in which:
 Figures 1 to 3 are respectively diagrammatic views of the different forms of apparatus.



   The forms of heating apparatus shown in Figure 1 comprises a solid fuel fired furnace 1, having an outlet 2 for hot exhaust gases which can flow to an inlet 3 of a separate heat exchanger 4. Interposed between the furnace 1 and the heat exchanger 4 is a particle separator or gas cleaning device 5. The separator 5 is arranged so that hot gas from the furnace outlet 2 is cleaned, the cleaned gas passing through the heat exchanger inlet 3. Separated particles, which are of ash, soot and unburnt coal, pass through a bottom outlet 6 of the separator 5 and can be discarded as waste or returned to the furnace 1 for reburning.



   In figure 2 there is shown an apparatus comprising a shell boiler having an internal furnace 10 of cylindrical shape and surrounded by a co-axial cylindrical outer shell 11. In the space 12 between the furnace 10 and the shell 11 is the heat exchanger 13 which comprises a plurality of small bore convector tubes 14 which are located in the space 12.



   Attached to an end face of the shell 11 is a particle separator 15. Exhaust gases from the furnace 10 pass through an outlet tube 16 to the separator 15 and the cleaned gas is directed to the tubes 14 of the heat exchanger. The tubes 14 direct the gas through one or more passes of the exchanger, the direction of gas flow being changed by a reversal chamber (not shown), which may form part of the separator 15. As in the previously described form of separator, particles separated from the furnace exhaust gas stream are collected from an outlet 17 of the separator 15.



   Figure 3 illustrates how the invention can be applied to a heating apparatus in the form of a water  tube or composite boiler. In such a boiler, a furnace 20 is connected to a heat exchanger 21, of fire tube or water tube design, through the intermediary of a high temperature convection surface or superheater 22.



  In order to ensure that clean gases are passed to the superheater 22 and heat exchanger 21 a particle separator 23 is located between the furnace 20 and the superheater 22.



   It will be appreciated that the invention can be applied to process heating in which clean gases are required for dryers, furnaces or other heating processes.

 

  Also, existing gas or oil fired boilers could be readily converted to operate on solid fuel by replacing the existing burner or furnace by a solid fuel grate in combination with a high temperature separator.



   In each of the above-described forms of apparatus, the particle separator is preferably a cyclonic device which is designed to operate at high temperatures.



  Generally, the cost of incorporating such a device would be balanced by the reduced cost of the heat exchanger, reduced maintenance costs and the elimination of costly tube replacement. Furthermore, the use of the separator between the furnace and the heat exchanger permits greater versatility of design since the heat exchanger does not have to cope with substantial exhaust particles. 

PCT/GB1983/000345 1982-12-24 1983-12-22 Heating apparatus WO1984002571A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU24335/84A AU2433584A (en) 1982-12-24 1983-12-22 Heating apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8236768 1982-12-24

Publications (3)

Publication Number Publication Date
WO1984002571A2 true WO1984002571A2 (en) 1984-07-05
WO1984002571A1 WO1984002571A1 (en) 1984-07-05
WO1984002571A3 WO1984002571A3 (en) 1984-08-02

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Also Published As

Publication number Publication date
WO1984002571A3 (en) 1984-08-02
EP0132432A1 (en) 1985-02-06

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Legal Events

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AK Designated states

Designated state(s): AU JP US

AL Designated countries for regional patents

Designated state(s): BE DE FR NL SE

AK Designated states

Designated state(s): AU JP US

AL Designated countries for regional patents

Designated state(s): BE DE FR NL SE

CFP Corrected version of a pamphlet front page
CR1 Correction of entry in section i

Free format text: IN PAT.BUL.16/84 UNDER INID (51) IPC 3 REPLACE THE PUBLISHED SYMBOLS BY THE FOLLOWING:F22B 31/00;F23J 3/04;F27D 17/00

COP Corrected version of pamphlet