WO1998014532A1 - Procede et dispositif pour mesurer le niveau d'un materiau en vrac contenant du carbone - Google Patents

Procede et dispositif pour mesurer le niveau d'un materiau en vrac contenant du carbone Download PDF

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Publication number
WO1998014532A1
WO1998014532A1 PCT/DE1997/002104 DE9702104W WO9814532A1 WO 1998014532 A1 WO1998014532 A1 WO 1998014532A1 DE 9702104 W DE9702104 W DE 9702104W WO 9814532 A1 WO9814532 A1 WO 9814532A1
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WO
WIPO (PCT)
Prior art keywords
bed
temperature
temperature measuring
measurement
carbon
Prior art date
Application number
PCT/DE1997/002104
Other languages
German (de)
English (en)
Inventor
Joachim Boretzky
Original Assignee
Siemens Aktiengesellschaft
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 Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Priority to JP10516115A priority Critical patent/JP2001503083A/ja
Publication of WO1998014532A1 publication Critical patent/WO1998014532A1/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water

Definitions

  • the invention relates to a method and a device for measuring the fill level of a carbon-containing bed, in particular a bed of pyrolyzed waste. It is used in particular to adjust the fill level of the pyrolyzed waste in a waste disposal plant, preferably in a plant using the smoldering-burning method. Such a plant produces hot, heterogeneous pyrolysed waste (pyrolysis residues).
  • the essential components of the plant for thermal waste disposal using the smoldering-burning process include a smoldering device (smoldering drum, pyrolysis reactor) and a high-temperature combustion chamber.
  • the smoldering device converts the waste fed in via a waste transport device in a substoichiometric smoldering or pyrolysis process into smoldering gas and pyrolysis residues (solid carbonaceous smoldering material).
  • the carbonization gas and the pyrolysis residue are fed to the burner of the high-temperature combustion chamber after suitable processing, in particular after sorting out recyclable fractions.
  • High-temperature combustion chamber creates molten slag, which is removed via a fume hood and which, after cooling, is in a glass-like form.
  • the resulting flue gas is fed to a chimney as an outlet via a flue gas line.
  • a heat recovery steam generator as a cooling device
  • a dust filter system and a flue gas cleaning system are installed.
  • a gas compressor which is arranged directly at the outlet of the flue gas cleaning system and can be designed as a suction fan.
  • the built-in gas compressor is used to maintain a vacuum, even if only slight, in the smoldering drum. This negative pressure prevents carbonization gas from escaping to the outside through the ring seals of the carbonization drum.
  • Waste of different types e.g. shredded household waste, industrial garbage-like industrial waste and shredded bulky waste, but also dewatered sludge that is fed to the smoldering drum.
  • a rotating, relatively long smoldering drum is generally used, which has a multiplicity of parallel heating tubes on the inside, on which the waste is largely heated in the absence of air.
  • the smoldering drum rotates around its longitudinal axis.
  • the longitudinal axis of the carbonization drum is preferably slightly inclined with respect to the horizontal, so that the solid carbonization material is at the exit of the
  • Collect the carbonization drum and from there it can be discharged via a carbonization gas and residue discharge housing with residue drop chute in the direction of a waste separation device for sorting out the recyclable fractions.
  • This discharge housing is also provided with a discharge pipe for the carbonization gas. High demands are made on the construction of the high-temperature combustion chamber including the burner.
  • a regulation of the fill level over a conveying path results from DE-OS 44 27 180.
  • a device is described in which a sealing graft is produced with the aid of a vertically arranged chute and a downstream spiral or screw conveyor.
  • a control device together with a level meter ensures that the level of the smoldering plug is kept at a predetermined value.
  • the pyrolysed waste as well as the pyrolysis gas is added to the discharge vessel mentioned. From there, the pyrolysis residue reaches a solids outlet via a discharge screw, which is driven by an electric motor, in order to be collected there. The recyclable materials are then sorted out.
  • the bulk material has a relatively high temperature, for example in the order of 450 ° C.
  • the object of the present invention is to provide a reliable method and a reliable device for measuring the fill level of a carbon-containing bed.
  • the method and device should be particularly suitable for measurements on the bed of hot pyrolyzed waste.
  • this object is achieved in that a temperature comparison measurement is carried out between a first and a second temperature measuring point, the two temperature measuring points being arranged almost at the same location, and the first temperature measuring point being flushed with a fuel which reacts exothermically with the carbon-containing bed.
  • a first and a second temperature measuring probe are provided, that the two temperature measuring probes are arranged almost in the same place, that a first flushing device is provided to supply the first temperature measuring probe with a fuel that reacts exothermally with the carbon-containing bed rinse, and that a device for comparing the measurement signal of the first temperature measurement probe with the measurement signal of the second temperature measurement probe is provided.
  • a temperature difference sensor is therefore used to measure the height of the bed.
  • a temperature comparison measurement is used for height measurement. If both temperature measuring points are not covered by the bed, they have essentially the same temperature. If, on the other hand, both temperature measuring points are covered by the bed, the bed reacts at the first temperature measuring point with the fuel supplied, releasing thermal energy, that is to say with locally limited combustion. This leads to an increase in temperature there. This increase in temperature is recorded in comparison, ie by forming the difference from the second temperature measuring point. It can be displayed and / or processed further. It should be noted that the one temperature measuring point is flushed with the said fuel. This can be an oxygen-containing substance, a gas such as air.
  • the second temperature measuring point is used for comparison. To be on the safe side, this second measuring point can be rinsed with a substance that does not react with the fill. For example, this can be an inert gas, such as nitrogen.
  • 1 shows the basic structure of a device for measuring the fill level of a carbon-containing bed
  • FIG. 4 shows a section of a smoldering-firing plant with a discharge vessel and a device for measuring the
  • a temperature difference sensor 4 ie a device for measuring the fill level H of a bed 6 made of a hot, carbon-containing material, is accommodated in a wall 2.
  • This material can be, in particular, pyrolyzed waste that was released by a pyrolysis device or smoldering drum.
  • the device 4 comprises a first temperature measuring probe 8 for measuring the temperature at a first temperature measuring point and a second temperature measuring probe 10 for measuring the temperature at a second temperature measuring point. Both temperature measuring probes 8, 10 are arranged almost in the same place, ie the distance x between the two temperature measuring points 8a, 10a is only in the range of a few millimeters, for example in the range of 10 mm.
  • Both temperature measuring probes 8, 10 are designed as jacket thermocouples. This means that the thermocouples are housed in a protective tube 12 or 14. The tips of the jacket thermocouples 8, 10 each protrude a certain distance u or w from the tubes 12 or 14. This distance u or w can be approximately 3 mm, for example. The two thermocouples emit measuring signals ml and m2. These are subtracted from one another in a device 15.
  • the two tubes 12 and 14 which have a diameter of approximately 5 mm, are designed as gas guide tubes. This makes it possible to apply or rinse the first temperature measuring point 8a with a fuel which reacts exothermically with the bed 6, such as oxygen, and the second temperature measuring point 10a with a substance which does not react with the bed 6. Specifically, oxygen (0 2 ) is passed through the first pipe 12 and nitrogen (N 2 ) through the second pipe 14. The oxygen (0 2 ) is supplied in the form of air.
  • the two tubes 12, 14 are surrounded by a sheathed protective tube 16.
  • the flushing devices are generally designated 11 and 13.
  • FIG. 1 it is shown that the height H of the bed 6 does not reach the temperature difference sensor 4.
  • the two thermocouples 8, 10 will thus indicate essentially the same temperature as measuring signals ml, m2. If the bed 6 is now increased by adding waste, the tips of the two thermocouples 8, 10 are immersed in the hot substance.
  • the oxygen portion of the air supplied at the tip of the first thermocouple 8 is used for oxidation, ie it burns with a certain portion of the bulk substance in the area of the tip of the first thermocouple 8 the temperature at the first temperature measuring point 8a increases in comparison to the temperature at the second temperature measuring point 10a. This is because the second temperature measuring point 10a maintains the temperature impressed by the bed 6.
  • the temperature increase of the first measuring point 8a is an indication that the bed 6 has reached the sensor 4.
  • FIG. 2 shows the course of the temperature T as a function of the time t, with the transition from an area A without contact with the bed to an area B with contact with the bed at the time t 0 . It can be seen that in area B the measuring signals ml and m2 differ considerably from one another.
  • the temperature difference signal (ml-m2) which corresponds to the temperature difference ⁇ T, is plotted against the time t. From time t 0 on, the signal difference (ml-m2) in area B differs significantly from zero. This signal difference can either be displayed or processed further.
  • the difference temperature ⁇ T is approx. 0 ° Kelvin. If a bed 6 builds up and the bed 6 reaches or floods the probe 4, the difference in temperature ⁇ T will give a step response from time t 0 onwards. This signal can be easily processed.
  • FIG. 4 shows part of a smoldering burner.
  • a pyrolysis or smoldering drum 20 is provided which is kept under negative pressure with respect to the environment and which can be rotated about its longitudinal axis 21. It is coupled to a chute or a discharge vessel 24 by means of a seal 22.
  • the smoldering drum 20 is heated by heating gas h. Smoldering gas s and hot pyrolysis residue p, ie pyrolyzed waste, are placed in the discharge vessel 24.
  • the hot waste 6 forms a bed 6, which is removed in the direction of an outlet 28 via a discharge screw 26 which is not slightly inclined with respect to the horizontal.
  • the fill level H is measured with the aid of a plurality of temperature difference sensors 4 arranged one above the other, as shown by way of example in FIG.
  • the output signals ml, m2 of each of the sensors 4 are given in units 15 for the purpose of difference formation. Their output signals are sent to a control device 30. While each individual sensor 4 with unit 15 can only determine whether the fill level H of the bed 6 is below its own height, with several sensors 4 roughly the absolute height can be determined. If the fill level H drops below a predetermined minimum value, the speed of rotation of the discharge screw 26 is reduced or stopped by the control device 30 and the downstream motor control, so that the height H of the fill level can increase again. A sufficiently sealing plug of waste is thus always retained in the discharge vessel 24.

Abstract

L'invention concerne un dispositif présentant un premier et un second point de mesure de température (8a, 10a) qui sont presque situés au même emplacement et forment un capteur de température (4). Un premier dispositif (11) sert à rincer le premier point de mesure de température (8a) avec un combustible (O2) qui réagit de façon exothermique avec le matériau en vrac (6) contenant du carbone. L'invention concerne en outre un dispositif qui compare le signal de mesure (m1) du premier point de mesure de température (8a) avec le signal de mesure (m2) du second point de mesure de température (10a). La différence de température (T1-T2) obtenue indique si le matériau en vrac (6) a atteint le capteur de température (4) ou s'il se trouve en dessous de celui-ci.
PCT/DE1997/002104 1996-09-30 1997-09-18 Procede et dispositif pour mesurer le niveau d'un materiau en vrac contenant du carbone WO1998014532A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10516115A JP2001503083A (ja) 1996-09-30 1997-09-18 炭素含有ばら積み材の充填レベルの測定方法とその装置

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19640302.2 1996-09-30
DE1996140302 DE19640302A1 (de) 1996-09-30 1996-09-30 Verfahren und Einrichtung zur Messung des Füllstands einer kohlenstoffhaltigen Schüttung

Publications (1)

Publication Number Publication Date
WO1998014532A1 true WO1998014532A1 (fr) 1998-04-09

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1997/002104 WO1998014532A1 (fr) 1996-09-30 1997-09-18 Procede et dispositif pour mesurer le niveau d'un materiau en vrac contenant du carbone

Country Status (4)

Country Link
JP (1) JP2001503083A (fr)
DE (1) DE19640302A1 (fr)
TW (1) TW341660B (fr)
WO (1) WO1998014532A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2546299A (en) * 2016-01-14 2017-07-19 Intelligent Energy Ltd Fuel cartridge fill level sensing

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10251077B4 (de) * 2002-11-02 2005-07-14 Schott Ag Wassergekühlte Sondenaufnahme, Meßsondenhalter und Abschlußelement für Schmelzspiegelniveaumeßgeräte

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4449403A (en) * 1981-06-29 1984-05-22 Mcqueen Malcolm M Guide tube inserted liquid level sensor
US4663507A (en) * 1985-03-21 1987-05-05 Trerice Douglas N Method and apparatus for reduction of fly ash carbon by microwave
EP0302310A1 (fr) 1987-08-03 1989-02-08 Siemens Aktiengesellschaft Procédé et dispositif pour l'élimination thermique de déchets
DE3830153A1 (de) 1988-09-05 1990-03-15 Siemens Ag Pyrolysereaktor mit indirekter und direkter beheizung
DE4427180A1 (de) 1994-08-01 1996-02-08 Siemens Ag Verfahren zur Förderung von Pyrolyse-Reststoff und danach arbeitende Einrichtung

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1255938B (de) * 1965-11-17 1967-12-07 Miag Muehlenbau Schuetthoehenfuehler
DE3839414C2 (de) * 1988-11-22 1995-07-06 Siemens Ag Sensoranordnung zum Nachweis von Gasen durch exotherme katalytische Reaktionen

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4449403A (en) * 1981-06-29 1984-05-22 Mcqueen Malcolm M Guide tube inserted liquid level sensor
US4663507A (en) * 1985-03-21 1987-05-05 Trerice Douglas N Method and apparatus for reduction of fly ash carbon by microwave
EP0302310A1 (fr) 1987-08-03 1989-02-08 Siemens Aktiengesellschaft Procédé et dispositif pour l'élimination thermique de déchets
DE3830153A1 (de) 1988-09-05 1990-03-15 Siemens Ag Pyrolysereaktor mit indirekter und direkter beheizung
DE4427180A1 (de) 1994-08-01 1996-02-08 Siemens Ag Verfahren zur Förderung von Pyrolyse-Reststoff und danach arbeitende Einrichtung

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2546299A (en) * 2016-01-14 2017-07-19 Intelligent Energy Ltd Fuel cartridge fill level sensing

Also Published As

Publication number Publication date
JP2001503083A (ja) 2001-03-06
TW341660B (en) 1998-10-01
DE19640302A1 (de) 1998-04-02

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