Global Patent Index - EP 0121437 A3

EP 0121437 A3 19850123 - CONTROL SYSTEM FOR A BOILER OR FURNACE

Title (en)

CONTROL SYSTEM FOR A BOILER OR FURNACE

Publication

EP 0121437 A3 19850123 (EN)

Application

EP 84302239 A 19840402

Priority

GB 8308902 A 19830331

Abstract (en)

[origin: EP0121437A2] A control system for a boiler or furnace (2) extracts from the flue (4) a sample portion of the burnt flue gas. The level of unburnt oxygen therein is detected and compared with a stored reference level which, for the particular fuel supply rate, is indicative of efficient boiler or furnace operation. If the detected oxygen level differs from said stored reference level by more than a predetermined amount the relative proportion of fuel and air in the mixture is adjusted in the appropriate sense, prior to the burnt flue gas being re-tested. Before detection the sample portion is passed through a trap (18) having a condenser portion from which liquid condensed from the sample portion drains into a sump portion. The condensed liquid is automatically drawn from the sump portion at intervals by a siphonic duct.

IPC 1-7

F23N 5/00

IPC 8 full level

F23N 5/00 (2006.01)

CPC (source: EP)

F23N 5/006 (2013.01); F23N 2223/04 (2020.01); F23N 2223/08 (2020.01); F23N 2235/06 (2020.01); F23N 2235/12 (2020.01)

Citation (search report)

  • [A] FR 2392327 A1 19781222 - TELEGAN LTD [GB]
  • [A] EP 0050840 A1 19820505 - DUNGS KARL GMBH & CO [DE]
  • [A] US 4160170 A 19790703 - HARNER KERMIT I, et al
  • [A] US 3404836 A 19681008 - HICKAM WILLIAM M
  • [A] FR 2069721 A5 19710903 - JONES & LAUGHLIN STEEL CORP
  • [A] DE 3103940 A1 19820812 - BAUMBACH GUENTER DR ING, et al
  • [A] GB 2088091 A 19820603 - ECONICS CORP
  • [X] CONTROL AND INSTRUMENTATION. vol. 9, no. 11, December 1977, London, GB "Meeting smaller users' demands for efficient combustion controls", page 33.
  • [X] OIL & GAS JOURNAL, vol. 79, no. 38, September 21, 1981, Technology TULSA, Oklahoma, US D.J. LEONARD et al.: "Automatic control ups heater combustion", pages 134-138.
  • [X] ADVANCES IN INSTRUMENTATION, vol. 37, 1982, Part 3, Research Triangle Park, NC, US Pittsburgh, US C. PRESSER et al.: "Evaluation of O2 and Co monitoring systems for combustion controls", pages 1515-1536.

Designated contracting state (EPC)

AT BE CH DE FR GB IT LI LU NL SE

DOCDB simple family (publication)

EP 0121437 A2 19841010; EP 0121437 A3 19850123

DOCDB simple family (application)

EP 84302239 A 19840402