EP0069393B1 - Verfahren zur Früherkennung von Schwelbränden in Braunkohlenstaub enthaltenden Behältern durch Detektion von Methan - Google Patents

Verfahren zur Früherkennung von Schwelbränden in Braunkohlenstaub enthaltenden Behältern durch Detektion von Methan Download PDF

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Publication number
EP0069393B1
EP0069393B1 EP82106076A EP82106076A EP0069393B1 EP 0069393 B1 EP0069393 B1 EP 0069393B1 EP 82106076 A EP82106076 A EP 82106076A EP 82106076 A EP82106076 A EP 82106076A EP 0069393 B1 EP0069393 B1 EP 0069393B1
Authority
EP
European Patent Office
Prior art keywords
dust
detection
fires
brown coal
lignite
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
EP82106076A
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German (de)
English (en)
French (fr)
Other versions
EP0069393A1 (de
Inventor
Erhard Wolfrum
Hans-Peter Päffgen
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.)
Rheinbraun AG
Original Assignee
Rheinische Braunkohlenwerke 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
Application filed by Rheinische Braunkohlenwerke AG filed Critical Rheinische Braunkohlenwerke AG
Priority to AT82106076T priority Critical patent/ATE16429T1/de
Publication of EP0069393A1 publication Critical patent/EP0069393A1/de
Application granted granted Critical
Publication of EP0069393B1 publication Critical patent/EP0069393B1/de
Expired legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B17/00—Fire alarms; Alarms responsive to explosion
    • G08B17/10—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means
    • G08B17/117—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means by using a detection device for specific gases, e.g. combustion products, produced by the fire

Definitions

  • the invention relates to a method for the detection of smoldering fires in containers containing lignite dust, with the aid of which certain gases that form in the lignite dust and possibly escape therefrom can be measured with a suitable detector and used as "indicator gases" for early smoldering fire detection.
  • the method of measuring the carbon monoxide (CO) and / or carbon dioxide (C0 2 ) formed underground is used successfully for the early detection of fires or smoldering fires in hard coal (CH-A-586940).
  • CH-A-586940 hard coal
  • BK dust brown coal dust
  • the carbon monoxide content of the gas volume above the bed is currently also being determined.
  • the results of this method are not completely clear, since CO and C0 2 occur as degradation products of functional groups in brown coal even when the ignition temperature of the brown coal has not yet been reached.
  • CO or C0 2 can, however, also occur as a degradation product of functional groups in brown coal if the ignition temperature of the coal has not yet been reached. This fact makes for practice, e.g. B. for a dust bunker, the specification of a limit concentration is necessary from which the probability of the presence of a smoldering fire in a lignite dust bed is given.
  • H 2 and CH 4 only appear when a smoldering fire has occurred in the bed.
  • This detection of a smoldering fire by detecting H 2 and CH 4 is, in addition to the previous early detection via CO, a further developed method for the detection of smoldering fires in lignite dust. It is not absolutely necessary to state a limit concentration for H 2 and CH 4 , since these gases are specific for the presence of a smoldering fire. However, since it is difficult to measure the hydrogen content under operational conditions, the measurement of CH 4 is particularly suitable for the detection of smoldering fires.
  • a detector for detecting the gases in question is attached to the container containing lignite dust in such a way that it either engages with the probe in the emptying nozzle of the container or in the interior above the emptying nozzle, the probe both can reach in the area of the dumping height as well as in the gas space above the dumping height.
  • a plurality of such probes can also be provided spaced apart from one another and / or distributed in the circumferential direction over the length of the container.
  • the probes can either have detectors themselves or can be provided with connections which supply a mostly small amount of gas required for measurement to a suitable device, for example a gas chromatograph or other gas analyzer.
  • a suitable device for example a gas chromatograph or other gas analyzer.
  • the method according to the invention was first tested in the laboratory. For this purpose, smoldering fires were generated in a dust bed by heating the bed and introducing air.
  • the aim of the laboratory method was to compare the composition of the gases formed by a smoldering fire in the lignite dust with a gas that is formed when there is no smoldering fire.
  • the temperature in the bed was measured using thermocouples. After the above-mentioned temperatures in the bed had been reached, preheated air was introduced into the BK dust bed over a period of approximately 7.5 hours. The air flow rate was approx. 0.1 l / min.
  • the composition of the gases leaving the test apparatus was determined by gas chromatography with regard to H 2 , CH 4 , CO and C0 2 .
  • FIG. 1 The results of the tests are shown in a diagram in FIG. 1.
  • the representation is not to scale, and in view of the relatively low values for hydrogen and methane.
  • the diagram shows the proportions of the individual gas components H 2 , CH 4 , CO and C0 2 in volume percent (vol .-%) depending on the test temperature.
  • H 2 and CH 4 While the gas components CO and C0 2 are already present at temperatures below the ignition temperature, H 2 and CH 4 only appear when the ignition temperature is reached in order to reach a maximum value relatively quickly and then decrease in concentration again. The relatively pronounced increase in the concentration of gases H 2 and CH 4 is therefore particularly well suited for the early detection of a smoldering fire.
  • a lignite dust bunker 1 narrows in its lower part to form a funnel 2 which opens into an outlet element 3.
  • This outlet member 3 consists in detail of a cellular wheel 4 with drive 5 and a bellows 6 for adaptation to different customers.
  • the dust bunker 1 at the level of its funnel 2 has a ring line 7 for supplying compressed air so that the bed inside the dust bunker can be loosened if necessary.
  • a CH 4 -IR gas analyzer (not shown) reaches with a probe 8 into the emptying nozzle of the container.
  • three identical probes 9 are attached at almost the same distance and possibly distributed in the circumferential direction over the axial length of the container, the probes projecting both into the area of the dust bed 10 and into the gas space 11 above the bed. These probes are also connected to a CH 4 -IR gas analyzer. Dust filters (not shown) are installed between the probe 8 or the probes 9 and the CH 4 -IR gas analyzers to protect the measuring devices.
  • the basic CH 4 value determined via probes 9 in the bunker was 5 to 33 ppm, and the basic CH 4 value measured via probe 8 when the bunker was emptied was approximately 10 ppm.

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  • Analytical Chemistry (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Sampling And Sample Adjustment (AREA)
  • Investigating Or Analyzing Materials Using Thermal Means (AREA)
  • Measuring Or Testing Involving Enzymes Or Micro-Organisms (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Solid Fuels And Fuel-Associated Substances (AREA)
  • Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)
  • Processing Of Solid Wastes (AREA)
EP82106076A 1981-07-08 1982-07-07 Verfahren zur Früherkennung von Schwelbränden in Braunkohlenstaub enthaltenden Behältern durch Detektion von Methan Expired EP0069393B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82106076T ATE16429T1 (de) 1981-07-08 1982-07-07 Verfahren zur frueherkennung von schwelbraenden in braunkohlenstaub enthaltenden behaeltern durch detektion von methan.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3126864A DE3126864C2 (de) 1981-07-08 1981-07-08 Verfahren zur Früherkennung von Schwelbränden in Braunkohlenstaub enthaltenden Behältern
DE3126864 1981-07-08

Publications (2)

Publication Number Publication Date
EP0069393A1 EP0069393A1 (de) 1983-01-12
EP0069393B1 true EP0069393B1 (de) 1985-11-06

Family

ID=6136361

Family Applications (2)

Application Number Title Priority Date Filing Date
EP82106076A Expired EP0069393B1 (de) 1981-07-08 1982-07-07 Verfahren zur Früherkennung von Schwelbränden in Braunkohlenstaub enthaltenden Behältern durch Detektion von Methan
EP82902156A Pending EP0082867A1 (de) 1981-07-08 1982-07-07 Verfahren zur früherkennung von schwelbränden in braunkohlenstaub enthaltenden behältern durch detektion von methan

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP82902156A Pending EP0082867A1 (de) 1981-07-08 1982-07-07 Verfahren zur früherkennung von schwelbränden in braunkohlenstaub enthaltenden behältern durch detektion von methan

Country Status (8)

Country Link
EP (2) EP0069393B1 (cs)
AT (1) ATE16429T1 (cs)
AU (1) AU557814B2 (cs)
CA (1) CA1187718A (cs)
CS (1) CS245771B2 (cs)
DD (1) DD207438A1 (cs)
DE (2) DE3126864C2 (cs)
WO (1) WO1983000247A1 (cs)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9417289U1 (de) * 1994-10-27 1995-01-26 Meinke, Peter, Prof. Dr.-Ing., 82319 Starnberg Detektoreinrichtung, Detektorsystem und Immunosensor zum Erkennen von Bränden
DE19808663C2 (de) * 1998-03-02 2001-05-23 Epcos Ag System zur Branderkennung und Betriebsverfahren für dieses System
RU2175779C1 (ru) * 2000-11-28 2001-11-10 Николаев Юрий Николаевич Способ диагностики предпожарной ситуации и предотвращения возникновения пожара
CN105510175B (zh) * 2015-12-08 2018-04-06 辽宁工程技术大学 一种测定阻化剂阻化性能的方法
CN114813635B (zh) * 2022-06-28 2022-10-04 华谱智能科技(天津)有限公司 煤炉燃烧参数的优化方法及电子设备

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE539562C (de) * 1929-01-24 1931-12-10 Hermann Heinicke Einrichtung zur Bestimmung von Methan und anderen Kohlenwassersstoffen in Mischgasendurch katalytische Verbrennung
DE1160669B (de) * 1961-05-05 1964-01-02 Zd Y Prumyslove Automatisace N Fuehler fuer die Indikation der Waerme-Konvektionsstroemung, insbesondere bei katalytischen Gasanalysatoren
BE647714A (cs) * 1964-05-11 1964-08-31
DE2331984C2 (de) * 1973-06-16 1983-01-20 Bergwerksverband Gmbh, 4300 Essen Überwachungseinrichtung zum Abschalten von elektrischen Betriebsmitteln beim Überschreiten eines CH↓4↓-CO- Grenzwertes in Grubenräumen .
CH586940A5 (en) * 1974-10-03 1977-04-15 Anglo Amer Corp South Africa New method of fire detection in mines - obtains continuous measurement of carbon dioxide concentration gives alarm when given value is exceeded
GB1592506A (en) * 1976-12-15 1981-07-08 Consolidation Coal Co Electrical circuitry for detecting a combustible mixture of gas in a mine atmosphere
US4129030A (en) * 1977-10-13 1978-12-12 Ads Systems, Inc. Sensing apparatus and method

Also Published As

Publication number Publication date
EP0069393A1 (de) 1983-01-12
AU557814B2 (en) 1987-01-08
CS245771B2 (en) 1986-10-16
DE3126864C2 (de) 1986-01-02
WO1983000247A1 (en) 1983-01-20
DE3126864A1 (de) 1983-01-27
CA1187718A (en) 1985-05-28
DD207438A1 (de) 1984-02-29
DE3267275D1 (en) 1985-12-12
ATE16429T1 (de) 1985-11-15
AU8688682A (en) 1983-02-02
EP0082867A1 (de) 1983-07-06

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