US3669041A - Double combustion firing - Google Patents

Double combustion firing Download PDF

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Publication number
US3669041A
US3669041A US42066A US3669041DA US3669041A US 3669041 A US3669041 A US 3669041A US 42066 A US42066 A US 42066A US 3669041D A US3669041D A US 3669041DA US 3669041 A US3669041 A US 3669041A
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US
United States
Prior art keywords
burner
door
time
predetermined period
double combustion
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 - Lifetime
Application number
US42066A
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English (en)
Inventor
Emil Schwoerer
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.)
Apparatebau AG
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Apparatebau AG
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Filing date
Publication date
Application filed by Apparatebau AG filed Critical Apparatebau AG
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Publication of US3669041A publication Critical patent/US3669041A/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/08—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having supplementary heating
    • F23G5/12—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having supplementary heating using gaseous or liquid fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C1/00—Combustion apparatus specially adapted for combustion of two or more kinds of fuel simultaneously or alternately, at least one kind of fuel being either a fluid fuel or a solid fuel suspended in a carrier gas or air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/24—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having a vertical, substantially cylindrical, combustion chamber
    • F23G5/245—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having a vertical, substantially cylindrical, combustion chamber with perforated bottom or grate
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/50—Control or safety arrangements

Definitions

  • ABSTRACT A double combustion firing for solid and gaseous liquid fuels 5 Claims, 1 Drawing Figure DOUBLE COMBUSTION FIRING This invention relates to a double combustion firing for solid and for gaseous or liquid fuels.
  • the double combustion firing has one fire chamber which is limited downwards by a grate for the reception of the solid fuels and a feed opening provided with a door for the solid fuels. Furthermore a'bumer for the gaseous or liquid fuel discharges into the firing chamber whereby the burner can be switched on and off by means of a control circuit and has been arranged in such a manner that its flame is pointed toward the grate.
  • the ignition and incineration of the above mentioned material after the material to be incinerated-has been thrown into the fire chamber, is left to the switching on of the burner in accordance with its fully automatie, temperature-dependent control, then it may happen that the material thrown in may remain lying there for a relatively long time without its being burned or that it will be.
  • a further object of the invention resides'in the prevention of the drawbacks described. Accordingly, it is the object of the invention to improve a double combustion firing of the initially mentioned type in such a way that the burner will be placed in operation automatically during a certain period of time each time after material has been thrown into the firing chamber and that the throwing in of the material is possible only when the burner is switched off.
  • the construction may effectively be such that the time relay will bridge the one or several thermostat switches during the predetermined period of time after each closing of the door of the feed opening.
  • the predetermined period of time mentioned may amount to between 5 and 15 minutes, preferably 10 minutes.
  • an element controlling the supply of fuel or air for the burner, has been connected with the time relay in such a way that it will operate the burner after every closing of the door of the feed openingand during a predetermined period of time with a considerable surplus of air.
  • the surplus of air amounts to about percent.
  • the one FIGURE of the drawing shows the boiler partly in side view and partly in vertical section showing the firing, whereby the electriccircuit diagram of the control arrangement for the boiler has been also indicated.
  • the boiler 10, shown in the drawing, has been provided with a double combustion firing means 11.
  • the latter shows a single firing chamber 12 which is limited downwards by a grate 13 for the support of solid fuels.
  • the firing chamber 12 has a feed opening 15 for the solid fuels, provided with a door 14.
  • pipes 16 for the flue gas lead to a ventilator or exhaust pipe '17 for the smoke, which has been attached to a chimney, not shown.
  • a burner 18 for gaseous or liquid fuel discharges laterally into the fire chamber 12 and has been arranged in such a way that its flame 19 is directed toward the grate 13.
  • the burner 18 has a blower and fuel pump unit 20, which can be driven by an electric motor 21.
  • the burner 18 can be switched on and off in a known manner by means of an electric control circuit 22 to 28, in which a thermostat switch 29 has been disposed which brings about an automatic temperature-dependent control of the burner 18.
  • the thermostat switch 29 may, for example, respond to the boiler temperature or the flue gas temperature in the flue gas ventilator or outlet 17. Whenever the boiler 10 is part of a central heating system, the thermostat switch 29 may then however respond to the room temperature or the outside temperature. Possibly, several thermostat switches may be available which individually react to various temperatures.
  • the control circuit 22 to 28 has two terminals 30 and 31, which must be connected to a current supply source, not shown.
  • a switch 32 has been inserted between the branch lines 27 and 28, which can be operated by the door 14 of the feed opening 15, and to be sure, in such a way that upon opening of the door 14, the switch 32 will be automatically opened and as a result thereof, the connection between the branch lines 27 and 28 of the control circuit 22 to 28 will be interrupted. This means that in the case of each opening of the door 14, the burner 18 is switched off automatically whenever it was in operation immediately preceding such opening.
  • a time relay 33 can be utilized in the control circuit 22 to 28, which has an energizer coil 34, a rest contact 35 an operating contact 36 and an adjustable delay device 37.
  • the latter has been provided such that the contacts 35 and 36 are operated immediately upon energizing of coil 34 and then remain in operation during a predetermined period of time for 5 to 15 minutes, preferably about minutes, after which they return automatically to their starting position.
  • the exciting coil 34 is connected between the branches 22 and 27, so that the current flowing through the coil 34 is controlled by means of the switch 32.
  • the operating contact 36 has been connected in parallel to the thermostat switch 29 in order to be able to bridge the latter.
  • the rest contact 35 has been connected, on the one hand, to a branch line 24 leading to the motor 21 and, on the other hand, by means of a lead 38, to an electromagnet 40 and a lead 39 to the other branch 23 leading to the motor.
  • the electromagnet 40 is connected to a valve 41, which influences the fuel supply for the burner 18 and to be sure such that the quantity of fuel fed to the burner per time unit is about twice as large as it is in the case of the de-energized magnet 40.
  • the burner 18 is switched on and off automatically and cyclically dependent on the temperature, and in controlled dependence on the thermostat switch 29.
  • the door 14 of the feed opening 15 in that case remains permanently closed, and contacts 35 and 36 of the time relay 33 are in the switching positions as shown.
  • the circuit 38 and 39 of the electromagnet 40 is closed by means of the rest contact 35, so that each time burner 18 is switched on, the electromagnet 40 will also be energized and, as a result thereof, the valve 41 is opened. Therefore, the burner 18 will receive the full quantity of fuel each time it is switched on by means of the thermostat switch 29.
  • the air supply for the burner 18 has been adjusted in such a way that the burner will operate with only slight surplus of air.
  • the switch 32 automatically moves to its closed position, as a result of which the circuit is closed by the exciting coil 34 of the time relay 33.
  • the operating contact 36 of the time relay is immediately closed and the rest contact 35 is opened.
  • the closing of the operating contact 36 brings about a bridging of the thermostat switch 29, so that the circuit 22 to 28 is closed and the burner 18 is placed in operation independently of the position of the thermostat switch 29 and regardless of whether the burner was or was not in operation immediately prior to the opening of door 14.
  • the now opened rest contact 35 of the time relay 33 will bring about the fact, that the electromagnet 40 is not switched on and that the valve 41 will reduce the quantity of fuel fed to the burner 18 per time unit to approximately half the normal operating quantity.
  • the air-supply for the burner remains unchanged and therefore burner 18 is now operated with about 100 percent surplus of air.
  • sufficient oxygen for the combustion of the material thrown into the fire chamber 12 besides the oxygen required by the burner itself, will surely be supplied to the fire chamber.
  • the solid material thrown in consequently will be ignited without failure by the burner 18 and incinerated.
  • This method of operation of the burner 18 is limited to a predetennined period of time set in the time relay 33.
  • the period of time can be selected for example between 5 and 15 minutes and depends in the first place on the capacity of the fire chamber 12 and on the performance of the burner 18.
  • the delay device 37 in the time relay 33 causes the contacts 35 and 36 to assume their starting position again, although the circuit remains closed further by the exciting coil 34.
  • the thermostat switch 29 for the control of the burner is again effective.
  • the rest contact 35 again closes the circuit through the electromagnet 40, so that the valve 41 will again permit the full quantity of fuel per time unit to flow to the burner 18.
  • the burner is now operated again at normal operation or it is turned off depending on the pertinent position of the thermostat switch'29. Up to the next opening and closing of the door 14 of the feed opening, the firing mechanism therefore operates again exclusively in controlled dependence on the thermostat switch 29.
  • the burner 18 is switched off entirely from the supply source by disconnection of the terminals 30 and 31, and a solid fuel is thrown through the feed opening 15 onto the grate 13 of the fire chamber 12 and is ignited by some conventional means or other.
  • valve 41 can be used for the reduction of fuel during the combustion of solid materials, which device will cause a doubling of the air supply at an even fuel supply.
  • the ratio of fuel to air supply is important, whereby a considerable surplus of air of preferably about percent, as compared to normal operation, with the burner 18 alone will be striven for during burning of the solid material.
  • time relay 33 in the drawing has been illustrated as an electromechanical relay, it may just as well be in the form of an electronic time relay in solid body engineering.
  • Double combustion firing for solid and for gaseous or liquid fuels with a single fire chamber comprising a burner nozzle directed downwards toward a grate for the support of the solid fuels, a feed opening in the chamber for the solid fuels provided with a door, and the burner for the gaseous or liquid fuels discharging into the fire chamber, means connected to the burner for switching on and off from a control circuit and the flame from the nozzle being pointed toward the grate, a switch arranged in the control circuit for the burner which can be operated by the door of the feed opening so that in the case of an opened door, the burner will be out of operation and after each closing of the door the burner will be in operation for a predetermined period of time by a time relay independently of whether the burner was or was not in operation prior to the door being opened.
  • Double combustion firing according to claim 1, in which means are provided to control the fuel or the air supply to the burner and connected with the time relay so that it will operate the burner with an excess of air during the predetermined period of time after each closing of the door.
  • Double combustion firing according to claim 1 in which the surplus of air during the predetermined period of time amounts to approximately percent.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Incineration Of Waste (AREA)
US42066A 1969-05-29 1970-06-01 Double combustion firing Expired - Lifetime US3669041A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH811469A CH508857A (de) 1969-05-29 1969-05-29 Doppelbrandkessel

Publications (1)

Publication Number Publication Date
US3669041A true US3669041A (en) 1972-06-13

Family

ID=4335389

Family Applications (1)

Application Number Title Priority Date Filing Date
US42066A Expired - Lifetime US3669041A (en) 1969-05-29 1970-06-01 Double combustion firing

Country Status (7)

Country Link
US (1) US3669041A (de)
AT (1) AT292899B (de)
AU (1) AU1573370A (de)
CH (1) CH508857A (de)
DE (1) DE2025885A1 (de)
FR (1) FR2049133B1 (de)
SE (1) SE347064B (de)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4377115A (en) * 1979-12-21 1983-03-22 Kolze Bruce A Furnace for burning particulate wood waste material
US4377117A (en) * 1979-12-21 1983-03-22 Kolze Bruce A Particulate waste wood firing system
US4413590A (en) * 1979-11-23 1983-11-08 Jean Mingret Boiler for a heating system
US5123876A (en) * 1990-10-30 1992-06-23 Mccullough Fredrick L Attic fan cover
US20110300494A1 (en) * 2010-06-04 2011-12-08 Maxitrol Company Control system and method for a solid fuel combustion appliance
US20120073557A1 (en) * 2010-09-23 2012-03-29 David B. Knight & Associates, Inc. Barbeque oven
US20130255548A1 (en) * 2012-03-27 2013-10-03 Clearsign Combustion Corporation Multiple fuel combustion system and method
US8833360B2 (en) 2010-05-10 2014-09-16 David B. Knight & Associates, Inc. Convection oven
US9395092B2 (en) 2013-03-15 2016-07-19 David B. Knight & Associates, Inc. Front mounted air circulator for an oven
US20170038064A1 (en) * 2014-02-14 2017-02-09 Clearsign Combustion Corporation Down-fired burner with a perforated flame holder
US9696031B2 (en) 2012-03-27 2017-07-04 Clearsign Combustion Corporation System and method for combustion of multiple fuels
US10234139B2 (en) 2010-06-04 2019-03-19 Maxitrol Company Control system and method for a solid fuel combustion appliance
US11022305B2 (en) 2010-06-04 2021-06-01 Maxitrol Company Control system and method for a solid fuel combustion appliance
US12560321B2 (en) * 2017-05-26 2026-02-24 Manik Ventures Limited Materials recycling apparatus

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4413590A (en) * 1979-11-23 1983-11-08 Jean Mingret Boiler for a heating system
US4377117A (en) * 1979-12-21 1983-03-22 Kolze Bruce A Particulate waste wood firing system
US4377115A (en) * 1979-12-21 1983-03-22 Kolze Bruce A Furnace for burning particulate wood waste material
US5123876A (en) * 1990-10-30 1992-06-23 Mccullough Fredrick L Attic fan cover
US8833360B2 (en) 2010-05-10 2014-09-16 David B. Knight & Associates, Inc. Convection oven
US10314433B1 (en) 2010-05-10 2019-06-11 David B. Knight & Associates, Inc. Barbeque oven
US9803862B2 (en) * 2010-06-04 2017-10-31 Maxitrol Company Control system and method for a solid fuel combustion appliance
US20110300494A1 (en) * 2010-06-04 2011-12-08 Maxitrol Company Control system and method for a solid fuel combustion appliance
US11022305B2 (en) 2010-06-04 2021-06-01 Maxitrol Company Control system and method for a solid fuel combustion appliance
US10234139B2 (en) 2010-06-04 2019-03-19 Maxitrol Company Control system and method for a solid fuel combustion appliance
US20120073557A1 (en) * 2010-09-23 2012-03-29 David B. Knight & Associates, Inc. Barbeque oven
US9200809B2 (en) * 2010-09-23 2015-12-01 David B. Knight & Associates, Inc. Barbeque oven
US10101024B2 (en) 2012-03-27 2018-10-16 Clearsign Combustion Corporation Method for combustion of multiple fuels
US9696031B2 (en) 2012-03-27 2017-07-04 Clearsign Combustion Corporation System and method for combustion of multiple fuels
US9267680B2 (en) * 2012-03-27 2016-02-23 Clearsign Combustion Corporation Multiple fuel combustion system and method
US20130255548A1 (en) * 2012-03-27 2013-10-03 Clearsign Combustion Corporation Multiple fuel combustion system and method
US9395092B2 (en) 2013-03-15 2016-07-19 David B. Knight & Associates, Inc. Front mounted air circulator for an oven
US10088154B2 (en) * 2014-02-14 2018-10-02 Clearsign Combustion Corporation Down-fired burner with a perforated flame holder
US20170038064A1 (en) * 2014-02-14 2017-02-09 Clearsign Combustion Corporation Down-fired burner with a perforated flame holder
US12560321B2 (en) * 2017-05-26 2026-02-24 Manik Ventures Limited Materials recycling apparatus

Also Published As

Publication number Publication date
FR2049133B1 (de) 1973-02-02
DE2025885A1 (de) 1971-04-22
SE347064B (de) 1972-07-24
CH508857A (de) 1971-06-15
FR2049133A1 (de) 1971-03-26
AU1573370A (en) 1971-12-02
AT292899B (de) 1971-09-10

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