EP0099825B1 - Générateur électrique de gaz chaud - Google Patents

Générateur électrique de gaz chaud Download PDF

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Publication number
EP0099825B1
EP0099825B1 EP19830401459 EP83401459A EP0099825B1 EP 0099825 B1 EP0099825 B1 EP 0099825B1 EP 19830401459 EP19830401459 EP 19830401459 EP 83401459 A EP83401459 A EP 83401459A EP 0099825 B1 EP0099825 B1 EP 0099825B1
Authority
EP
European Patent Office
Prior art keywords
resistors
gas heater
heater according
electric gas
group
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
EP19830401459
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0099825A1 (fr
Inventor
Jean-Louis Bouju
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.)
Fives Cail Babcock SA
Original Assignee
Fives Cail Babcock SA
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 Fives Cail Babcock SA filed Critical Fives Cail Babcock SA
Publication of EP0099825A1 publication Critical patent/EP0099825A1/fr
Application granted granted Critical
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/18—Arrangement or mounting of grates or heating means
    • F24H9/1854—Arrangement or mounting of grates or heating means for air heaters
    • F24H9/1863—Arrangement or mounting of electric heating means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H3/00—Air heaters
    • F24H3/02—Air heaters with forced circulation
    • F24H3/04—Air heaters with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element
    • F24H3/0405—Air heaters with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element using electric energy supply, e.g. the heating medium being a resistive element; Heating by direct contact, i.e. with resistive elements, electrodes and fins being bonded together without additional element in-between

Definitions

  • the present invention relates to an electric hot gas generator of the type comprising an elongated refractory insulating jacket provided at one end with an inlet opening for the gas to be heated, and at the other end with an opening hot gas outlet, and a plurality of electrical heating resistors arranged inside the envelope in a transverse direction thereof.
  • the main object of the invention is to remedy the aforementioned drawbacks.
  • the invention more specifically relates to an electric hot gas generator comprising an elongated refractory insulating jacket provided at one of its ends with an inlet opening for the gas to be heated, and at the other end with a hot gas outlet opening, and a plurality of electrical heating resistors arranged inside the envelope in a transverse direction thereof, characterized in that each resistance is surrounded by a plurality of dead tubes heated by radiation.
  • the resistors are divided into several groups, the resistors of the same group being supplied electrically in parallel, and the number of resistors of each group increasing from one group to the next in the direction of gas flow.
  • the dead tubes are preferably arranged parallel to the resistors.
  • the resistors can be mounted vertically suspended inside the envelope, the latter being arranged horizontally.
  • the resistors can be formed by double silicon carbide spirals, in one piece.
  • Dead tubes can also be made of silicon carbide.
  • two dead tubes are arranged on either side of each resistor in the transverse plane containing said resistor with which they define a first row, and a second row formed of three dead tubes is arranged in another transverse plane separated from the previous one by a distance substantially equal to the difference existing between each dead tube of the first row and the resistance of said first row and at half the interval separating two successive resistances of the same group.
  • the generator of the invention comprises a system for regulating the outlet temperature of the hot gas comprising a plurality of thyristors, ie one thyristor per group of resistors, each thyristor controlling the supply of the group of resistors with which it is associated. It also includes a safety system which interrupts heating when the power difference between the supply of two groups of resistors exceeds a predetermined value.
  • each group may be supplied by one phase from a three-phase source, the regulation system comprising three thyristors with phase-shifted angle control and the security system being provided for detecting the power difference between phases.
  • the reference 1 designates the envelope of the hot gas generator.
  • This envelope has the shape of a rectangular parallelepiped whose walls, formed of two layers of refractory and insulating concrete, delimit the passage of gas between an inlet opening 2 and an outlet opening 3, respectively fitted at the two ends of the casing 1.
  • the above-mentioned rectangular parallelepiped has the following dimensions: 5 m long, 1 m wide and 1.20 m high.
  • the dimensions of the gas passage are as follows: 5 m long, 0.30 m wide and 0.60 m high. These dimensions do not take into account the end portions connecting the body of the envelope to the openings 2 and 3.
  • each resistor 4 made of silicon carbide, has the shape of a double spiral in one piece.
  • Each resistor 4 is surrounded by dead tubes, such as 5, also made of silicon carbide whose function consists in transmitting to the gas the heat received by radiation from the resistors 4.
  • the ballast tubes 5 are advantageously embedded at their ends in the lower walls and top of the casing 1 arranged horizontally.
  • FIG. 4 shows the relative arrangements of two neighboring resistors 4 and of dead tubes 5 which surround them.
  • Two dead tubes 5a and 5b are arranged on either side of the resistor 4 ', parallel to the latter, in the same transverse plane of the casing 1 containing said resistor with which they define a first row.
  • a second row formed by three dead tubes 5c, 5d and 5e is arranged in another transverse plane.
  • the tube 5c is arranged opposite the tube 5a, the tube 5e opposite the tube 5b, while the tube 5d is arranged opposite the resistor 4 'to which all these tubes are parallel.
  • the distance A separating the two aforementioned transverse planes is substantially equal to the difference B existing between each dead tube 5a and 5b and the resistor 4 '. It is of course equal to the difference existing between the tubes 5c, 5d and 5e of the second row.
  • the distance A is moreover substantially equal to half of the interval C separating the two successive resistors 4 ′ and 4 ".
  • the arrangement which has just been described is, of course, repetitive.
  • the resistors 4 are divided into several groups, the resistors of the same group being electrically supplied in parallel.
  • the number of resistors in the same group increases from one group to the next in the direction of gas circulation between the openings 2 and 3 of the casing 1.
  • each group there are provided three groups Gi, G 2 , G 3 having respectively 5, 7, 9 resistors arranged as previously indicated.
  • the resistors 4 are supplied in parallel, while the groups G i , G 2 , G 3 , are also supplied in parallel, for example by a three-phase electrical source.
  • variable number of resistors 4 per group takes into account the fact that the temperature of the gas increases from the inlet to the outlet, and that consequently the power which each resistor 4 can dissipate decreases from upstream to downstream, counts given the maximum admissible temperature for resistors 4 (approximately 1650 ° C in an oxidizing atmosphere). It should also be noted that this maximum temperature depends on the value of each resistance which can vary over time.
  • a bundle F only constituted by dead tubes 5.
  • This bundle which comprises for example 18 dead tubes is arranged in a way analogous to the preceding groups, ie six rows of three tubes 5 parallel to the tubes 5 which surround the resistors 4. The function of the tubes 5 of this bundle is to ensure perfect homogenization of the outlet temperature.
  • resistors 4 The power is ultimately delivered by 21 resistors 4.
  • FIG. 5 schematically represents the system for regulating the outlet temperature.
  • This system comprises a plurality of thyristors, namely one thyristor per group of resistors 4, each thyristor controlling the supply of the group of resistors with which it is associated.
  • the thyristors T 1 , T 2 and T 3 respectively control the resistors 4 of the groups G “G 2 and Gs.
  • the thyristors are supplied in parallel, for example by a phase from a three-phase source, as previously indicated. Thyristors with phase shift angle control are then used.
  • a thermometer T measures the temperature of the gas at the generator outlet, and sends a signal representative of this temperature to a comparator.
  • the comparator CT which compares the value of said temperature with a set value
  • the comparator CT delivers a difference signal to each thyristor T i , T 2 , T 3 respectively connected to the groups Gi, G 2 , G 3 of resistors 4 of which the supply is regulated in a conventional manner.
  • a security system S known per se, and designed to interrupt heating when the power difference between the supply of two groups of resistors exceeds a predetermined value.
  • This system S is connected to the thyristors Ti, T 2 , T 3 by means of a wattmeter, respectively W i , W 2 , W 3 .
  • the security system S compares the powers measured by said wattmeters and emits, if necessary, a security signal capable of acting on a switch (not shown) in order to cut off the electrical supply.
  • the safety system S compares the power differences between the different phases (discrepancy detection).
  • Each group Gi, G 2 , G 3 can be supplied separately.
  • the group Gi can also be supplied directly with a signal from the processing of the measurement difference - temperature setpoint.
  • the groups G 2 and G 3 can then be controlled indirectly by said signal by means of a potentiometer which makes it possible to obtain equal power on the three phases of the three-phase source.
  • the dimensions given by way of example may be modified in order to correspondingly modify the power required.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Resistance Heating (AREA)
EP19830401459 1982-07-19 1983-07-13 Générateur électrique de gaz chaud Expired EP0099825B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8212561A FR2530320B1 (enrdf_load_stackoverflow) 1982-07-19 1982-07-19
FR8212561 1982-07-19

Publications (2)

Publication Number Publication Date
EP0099825A1 EP0099825A1 (fr) 1984-02-01
EP0099825B1 true EP0099825B1 (fr) 1985-10-02

Family

ID=9276076

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19830401459 Expired EP0099825B1 (fr) 1982-07-19 1983-07-13 Générateur électrique de gaz chaud

Country Status (3)

Country Link
EP (1) EP0099825B1 (enrdf_load_stackoverflow)
DE (1) DE3360932D1 (enrdf_load_stackoverflow)
FR (1) FR2530320B1 (enrdf_load_stackoverflow)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2568672B1 (fr) * 1984-08-06 1988-12-09 Bertin & Cie Procede et dispositif de rechauffage de gaz par effet joule.
FR2579055B1 (fr) * 1985-03-15 1990-09-07 Metanic Sa Dispositif de chauffage electrique pour fluide gazeux
NO157640C (no) * 1985-07-09 1988-04-20 Nielsen Ingenioer Og Handelsak Varmeaggregat.
AT395268B (de) * 1988-04-15 1992-11-10 Vaillant Gmbh Wasserheizer
FR2636770B1 (fr) * 1988-09-19 1990-12-28 Sgn Soc Gen Tech Nouvelle Dispositif pour le rechauffage de gaz humide contamine
DE102005053731A1 (de) 2005-11-10 2007-05-24 Linde Ag Vorrichtung zur Hochdruckgaserhitzung
JP6033261B2 (ja) * 2013-06-28 2016-11-30 貞徳舎株式会社 熱風生成装置
CN109140786A (zh) * 2018-07-23 2019-01-04 珠海格力电器股份有限公司 防电墙及热水器
WO2022171603A1 (en) * 2021-02-10 2022-08-18 Shell Internationale Research Maatschappij B.V. An electrically heated apparatus

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE489379C (de) * 1927-11-25 1930-01-17 Siemens Schuckertwerke Akt Ges Elektrischer Winderhitzer
DE735982C (de) * 1937-03-03 1943-06-04 Dr Walter Schottky Anordnung zur elektrischen Erhitzung stroemender Luft oder Gase auf hohe Temperaturen

Also Published As

Publication number Publication date
FR2530320B1 (enrdf_load_stackoverflow) 1984-12-21
EP0099825A1 (fr) 1984-02-01
FR2530320A1 (enrdf_load_stackoverflow) 1984-01-20
DE3360932D1 (en) 1985-11-07

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