EP3006878A1 - Four à combustible et procédé pour faire fonctionner ce four - Google Patents

Four à combustible et procédé pour faire fonctionner ce four Download PDF

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Publication number
EP3006878A1
EP3006878A1 EP15188980.5A EP15188980A EP3006878A1 EP 3006878 A1 EP3006878 A1 EP 3006878A1 EP 15188980 A EP15188980 A EP 15188980A EP 3006878 A1 EP3006878 A1 EP 3006878A1
Authority
EP
European Patent Office
Prior art keywords
combustion gases
air
mixture
chamber
housing chamber
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.)
Granted
Application number
EP15188980.5A
Other languages
German (de)
English (en)
Other versions
EP3006878B1 (fr
Inventor
Oscar Pallaro
Oscar Martini
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.)
Individual
Original Assignee
Individual
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Publication date
Application filed by Individual filed Critical Individual
Priority to PL15188980T priority Critical patent/PL3006878T3/pl
Publication of EP3006878A1 publication Critical patent/EP3006878A1/fr
Application granted granted Critical
Publication of EP3006878B1 publication Critical patent/EP3006878B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D99/00—Subject matter not provided for in other groups of this subclass
    • F27D99/0001—Heating elements or systems
    • F27D99/0033—Heating elements or systems using burners
    • F27D99/0035—Heating indirectly through a radiant surface
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B17/00—Furnaces of a kind not covered by any preceding group
    • F27B17/0016—Chamber type furnaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D9/00—Cooling of furnaces or of charges therein

Definitions

  • the present invention regards a fuel oven and an operating method for said oven, according to the preamble of the relative independent claims.
  • the present oven and method are intended to be advantageously employed in multiple fields, such as in the food sector for cooking, drying, desiccating and heat cycles, or in the field of electronics for drying, desiccating and thermal treatments of components, or for thermal treatments on metals with heat cycles.
  • the present oven and method are intended to be used in the food field for cooking foods, in particular foods for human consumption.
  • the present oven is intended to be employed in a professional environment, e.g. in the restaurant/catering, gastronomy, confectionary and bakery sectors.
  • Fuel ovens are known on the market that are employed generally for cooking, drying, desiccating and heat cycles. Such ovens use fuel burners coupled to combustion chambers having the purpose of generating mainly hot or overheated air.
  • Such ovens of known type conventionally comprise a thermally-insulated chamber in which the material to be treated is inserted; such chamber is equipped with the following accessories: systems for transport and movement, for ventilation and treatment of the air including heating, dehumidification or humidification.
  • the heating is normally executed with hot air generators fed with fuel (methane, LPG, diesel) with indirect exchange, placed outside the treatment chamber and usually provided with blown-air burners.
  • fuel methane, LPG, diesel
  • a further drawback of the above-described fuel ovens of known type lies in the fact that the high speed of the process air, tied to the considerable flow rate that passes through the narrow sections of the chamber, generates air currents on the material to be thermally treated that are not always desirable for the heat cycle thereof.
  • a further drawback of the above-described fuel ovens of known type lies in the fact that the heating via irradiation of the material cannot be employed inside the treatment chamber, since the high-temperature combustion chamber of the hot air generators - which should irradiate directly on the material - is instead situated outside the treatment chamber itself, actually making it impossible to attain all those heat cycles where the thermal irradiation of the material is requested.
  • a further drawback of the above-described fuel ovens of known type lies in the fact that the hot air generators, in particular the burners, cause a strong increase of the temperature in the technical space where the generators are housed, with consequent problems in accessing the technical space and in generator efficiency.
  • a further drawback of the above-described fuel ovens of known type lies in the fact that such ovens generate a high amount of NO x in particular due to the high temperature of the combustion gases produced by the burners of the air generators.
  • the main object of the present invention is to overcome the abovementioned drawbacks of the prior art, by providing a fuel oven capable of attaining a suitable thermal control of the housing chamber of the burners, especially ensuring the cooling thereof.
  • Further object of the present invention is to have a fuel oven capable of having, in the thermal processes within the treatment chamber, heat exchange both due to irradiation and via convection, or only one of the two.
  • Further object of the present invention is to have an operating method for a fuel oven based on the use of burners, preferably multi-gas with forced suction, associated with a system for suctioning ambient air in order to draw air from the housing chamber of the aforesaid burners, especially ensuring the cooling of such chamber since the air comes from outside.
  • burners preferably multi-gas with forced suction
  • Further object of the present invention is to have an operating method for a fuel oven based on the use of burners, preferably multi-gas with forced suction, provided with a system for recirculating the combustion products that is integrated with the suction system of ambient air that is even introduced into the burner fume recirculation, thus creating a mixture of recirculation of the combustion products at lower temperature, improving the distribution of the temperature on the first section of the exchanger and further reducing the emissions of NO x .
  • reference number 1 overall indicates a fuel oven in accordance with a preferred embodiment of the present invention.
  • the oven is intended to be mainly employed for cooking, drying, desiccating, various thermal treatments and cycles of a general product.
  • the present fuel oven 1 is intended to be used for cooking foods, in particular foods for human consumption.
  • the oven 1 is intended to be used in a professional environment, e.g. in the restaurant-catering, gastronomy, confectionary and bakery sectors.
  • the oven 1 comprises a hollow containment body 2, which delimits at its interior a heat treatment chamber 3 in which a product to be treated is susceptible of being arranged.
  • the containment body 2 of the oven 1 has substantially box-like form and comprises a lower wall and an upper wall parallel to and facing each other, and two lateral walls placed to connect the upper and lower walls. Such walls together delimit the aforesaid heat treatment chamber 3.
  • the containment body 2 also comprises a bottom wall fixed to the upper, lower and lateral walls, as a rear closure of the heat treatment chamber 3.
  • the containment body 2 is provided with an access opening to the heat treatment chamber 3, such opening preferably positioned opposite the bottom wall of the containment body 2 itself.
  • the oven 1 comprises a door which is hinged to the containment body 2 and is movable between a closure position, in which it obstructs the access opening, and an open position, in which the access opening is free of the door in order to allow the introduction and extraction of the products to be treated (such as foods) in and by the heat treatment chamber 3.
  • the containment body 2 comprises panels of sandwich type able to ensure a good thermal insulation between the internal temperatures of the treatment chamber 3 and the external environment 9, as well as support the material to be treated and all the accessories for heating, dehumidification or humidification, in addition to the transport, movement, ventilation and treatment of the process air.
  • the oven 1 comprises a radiant tube 4 extending inside the heat treatment chamber 3 between an inlet opening 5 thereof, arranged at a first passage of the containment body 2, and an outlet opening 6 thereof, arranged at a second passage of the containment body 2.
  • the radiant tube 4 is made with a continuous tube that can have circular, square or rectangular profile, assuming configurations that are coil-like, "comb"-like, or of any other shape necessary for the thermal treatment of the material and compatible with the space available.
  • the present oven 1 also comprises a housing chamber 7, thermally insulated from the heat treatment chamber 3 and provided with at least one ventilation opening 8 through which the housing chamber 7 is susceptible of being connected with an external environment 9.
  • the housing chamber 7 is delimited by a structure that is not necessarily thermally insulated, with masonry or sandwich panels, more or less open towards the external environment 9, at most even fully open towards the external environment 9.
  • the containment body 2 (which delimits the heat treatment chamber 3) is provided with at least one insulated wall 10 (which for example constitutes the aforesaid bottom wall of the containment body 2 itself) positioned so as to separate the heat treatment chamber 3 and the housing chamber 7. More in detail, such wall 10 must ensure, at the passage openings 5 and 6 of the radiant tube 4 in the treatment chamber 3, protection from the high temperatures of the radiant tube 4 itself.
  • the oven 1 comprises a burner 11 arranged in the housing chamber 7, intended to burn a combustive mixture formed by the fuel 12 and air 13, in order to generate combustion gases 14 at high temperature, and provided with a dispensing head 16 fluidically connected with the inlet opening 5 of the radiant tube 4 in order to introduce the aforesaid combustion gases inside the latter.
  • the burner 11 is contained in a suitable metallic body 15, which also contains all the accessories, such as gas valves, air manostat, regulation and control unit (per se known to the man skilled in the art and therefore not described in detail).
  • accessories such as gas valves, air manostat, regulation and control unit (per se known to the man skilled in the art and therefore not described in detail).
  • the combustion gases which are introduced by the dispensing head 16 of the burner 11 into the inlet opening 5 of the radiant tube 4, traverse the latter, transferring heat to the walls of the radiant tube 4 itself.
  • Such heat is then irradiated into the heat treatment chamber 3, especially heating the air inside the latter in order to heat and thermally treat the product arranged inside the heat treatment chamber 3 itself.
  • connection from the dispensing head 16 of the burner 11 to the inlet opening 5 of the radiant tube 4 is made with mechanical fixing systems 17, preferably of flange type, arranged for the disconnection, possible maintenance or substitution of the radiant tube 4 or of the components physically connected to the radiant tube 4 itself which are situated inside the housing chamber 7.
  • the oven 1 comprises suction means 18 arranged in the housing chamber 7, provided with a suction mouth 25 fluidically connected with the outlet opening 6 of the radiant tube 4 and operable to suction the combustion gases out of the radiant tube itself.
  • the aforesaid suction means 18 comprise a suction fan suitable for suctioning and treating combustion products at high temperature (300°C) comprising in particular the electric motor 19 with self-cooling fan, a flange connection system upstream 20 and downstream 21 of the fan itself for the connection to the respective pipes.
  • the fuel oven 1 comprises a connection body of tubular shape 22, positioned in the housing chamber 7 and provided with an inner channel arranged to connect between the outlet opening 6 of the radiant tube 4 and the suction mouth 25 of the suction means 18.
  • the latter are adapted to generate an internal reduced pressure in the inner channel of the connection body 22 in order to suction the combusted gases out of the radiant tube 4.
  • connection body 22 is provided with at least one or more insufflation openings 23 through which the inner channel of the connection body 22 itself is in communication with the housing chamber 3.
  • the suction means 18 comprise, in addition to the aforesaid suction mouth 25, a delivery mouth 24 through which they emit a mixture composed of the combustion gases (which exit from the radiant tube 4 through the outlet 6) and the air blown into the inner channel of the connection body 22 through the insufflation openings 23 of the connection body itself.
  • a mixture of combustion gases and air has a temperature clearly lower than that of the combustion gases exiting from the section 6 of the radiant tube 4.
  • the oven 1 comprises a discharge pipe connected to the delivery mouth 24 of the suction means 18 and provided with at least one recirculation branch 26 fluidically connected with the dispensing head 16 of the burner 11, in order to convey a first part of the aforesaid mixture of combustion gases and air into the dispensing head 16, mixing such mixture with the combustion gases 14 generated in the burner 11 in order to lower the temperature of the latter.
  • the discharge pipe of the oven 1 comprises an expulsion branch 27 through which a second part of the mixture of combustion gases and air is conveyed out of the housing chamber 7.
  • the expulsion branch 27 of the discharge pipe is provided with regulation members 28 adapted to balance the flow of the combustion gases and air between the expulsion branch 27 and the recirculation branch 26.
  • the burner comprises a combustion chamber 29 in which the combustive mixture is burned, producing the combustion gases to be introduced into the radiant tube 4 through its dispensing head 16.
  • the burner comprises an outer chamber 30 which is connected to the combustion chamber 29 in order to receive the combustion gases generated in the latter, and is connected to the recirculation branch 26 of the discharge pipe in order to receive the mixture of air and combustion gases.
  • Such mixture is susceptible of being mixed with the combustion gases coming from the combustion chamber 29 of the burner 11 obtaining, in the outer chamber 30, a mixture of gas at a reduced temperature with respect to the temperature of the combustion gases generated in the combustion chamber itself.
  • the outer chamber 30 of the burner is connected to the dispensing head 16 in order to introduce the aforesaid mixture at a reduced temperature in said radiant tube 4.
  • connection body 22 of the oven 1 is provided with a control intake 31 arranged upstream of the insufflation openings 23 and positioned in particular between the latter and the containment body 2 which delimits the heat treatment chamber 3. A portion of the combustion gases which pass through the inner channel of the connection body 22 is drawn through such control intake 31.
  • the oven 1 comprises at least one detection device connected to the control intake 31 of the connection body 22 in order to intercept the aforesaid portion of combustion gases in order to detect parameters indicative of the operation and efficiency of the oven 1, such as the temperature, concentrations of CO 2 , CO and NO x .
  • the oven 1 comprises first ventilation means 32 arranged inside the heat treatment chamber 3 and operable to generate a forced convective motion of the air present in the heat treatment chamber 3, in order to facilitate the diffusion of the heat via convection inside the same.
  • such first ventilation means 32 comprise one or more first fans (of type per se known to the man skilled in the art).
  • the oven 1 comprises air treatment means 33, 36 operatively associated with the heat treatment chamber 3 and operable in order to change the degree of moisture inside the latter and/or to generate a forced air recirculation of the air present in the heat treatment chamber 3 itself.
  • the aforesaid thermal treatment means comprise second ventilation means 33 arranged inside the heat treatment chamber 3 and operable to generate a forced motion of the air present in the heat treatment chamber 3, in order to ensure an external air renewal of the treatment chamber 3 by means of introduction 34 and expulsion 35 openings made in the containment body 2.
  • second ventilation means 33 comprise one or more second fans (of type per se known to the man skilled in the art).
  • the air treatment means comprise humidification and dehumidification apparatuses 36 (for example provided with nebulizer means of type known to the man skilled in the art) arranged adjacent to the containment body 2 directly in communication with the heat treatment chamber 3, and operable to generate a humidification or a dehumidification and renewal of the air present in the heat treatment chamber 3 in order to ensure the suitable degree of moisture in the treatment chamber 3 by means of suitable adjustments of the introduction 34 and expulsion 35 openings.
  • humidification and dehumidification apparatuses 36 for example provided with nebulizer means of type known to the man skilled in the art
  • Also forming the object of the present invention is an operating method for a fuel oven, in particular of the above-described type; for the sake of simplicity, the same reference numbers will be employed hereinbelow.
  • the present operating method comprises a step for producing combustion gases at high temperature by means of the burner 11 and a step for introducing such combustion gases into the radiant tube 4, in which the combustion gases are introduced by the dispensing head 16 of the burner 11 into the radiant tube 4 itself through the inlet opening 5 of the latter.
  • the present method comprises a step for suctioning the combustion gases by means of the suction means 18, in which the combustion gases are forced to exit from the radiant tube 4 through the outlet opening 6 of the latter.
  • the suction means 18 in the aforesaid suction step, generate an internal reduced pressure in the inner channel of the connection body 2.
  • Such internal reduced pressure generates a flow of air which is suctioned, from the housing chamber 7, into the inner channel of the connection body 22 through the insufflation openings 23 of the latter, generating an external reduced pressure in the housing chamber 7 which suctions air coming from the external environment 9 through the ventilation opening 8 of the housing chamber 7 itself.
  • the flow of air, suctioned in the inner channel of the connection body 2 through the insufflation openings 23 of the latter, is mixed with the combustion gases (coming from the outlet opening 6 of the radiant tube 4) generating a mixture of air and combustion gases having temperature lower than that of such combustion gases.
  • the present method also comprises a step for recirculating the aforesaid mixture of air and combustion gases, in which the suction means 18 convey, by means of the recirculation branch 26 of the discharge pipe, a first part of the mixture of air and combustion gases to the interior of the burner 11, in which such mixture is mixed with the combustion gases produced in the burner 11 itself, generating a mixture at a reduced temperature with respect to the temperature of the combustion gases generated in the burner 11.
  • Such mixture at a reduced temperature is introduced into the inlet opening 5 of the radiant tube 4 through the dispensing head 16 of the burner 4.
  • the invention thus conceived therefore attains the pre-established objects.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Solid Materials (AREA)
  • Combustion Of Fluid Fuel (AREA)
EP15188980.5A 2014-10-09 2015-10-08 Four à combustible et procédé pour faire fonctionner ce four Active EP3006878B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL15188980T PL3006878T3 (pl) 2014-10-09 2015-10-08 Piec paliwowy i sposób obsługi pieca paliwowego

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITPD20140262 2014-10-09

Publications (2)

Publication Number Publication Date
EP3006878A1 true EP3006878A1 (fr) 2016-04-13
EP3006878B1 EP3006878B1 (fr) 2019-04-17

Family

ID=52101457

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15188980.5A Active EP3006878B1 (fr) 2014-10-09 2015-10-08 Four à combustible et procédé pour faire fonctionner ce four

Country Status (3)

Country Link
EP (1) EP3006878B1 (fr)
ES (1) ES2736039T3 (fr)
PL (1) PL3006878T3 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107356120A (zh) * 2017-08-29 2017-11-17 广西容县顺垚仿古建陶有限公司 一种古建青砖的烧制设备
CN110869522A (zh) * 2017-07-13 2020-03-06 安德里茨技术资产管理有限公司 用于减少带材处理炉中的氮氧化物的方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006120717A1 (fr) * 2005-05-11 2006-11-16 Systema S.P.A. Dispositif de chauffage a tubes rayonnants
EP2299175A1 (fr) * 2008-07-07 2011-03-23 JP Steel Plantech Co. Systeme de bruleur a tube radiant et bloc d'element de stockage de chaleur pouvant etre montes sur un bruleur a tube radiant

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006120717A1 (fr) * 2005-05-11 2006-11-16 Systema S.P.A. Dispositif de chauffage a tubes rayonnants
EP2299175A1 (fr) * 2008-07-07 2011-03-23 JP Steel Plantech Co. Systeme de bruleur a tube radiant et bloc d'element de stockage de chaleur pouvant etre montes sur un bruleur a tube radiant

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110869522A (zh) * 2017-07-13 2020-03-06 安德里茨技术资产管理有限公司 用于减少带材处理炉中的氮氧化物的方法
CN107356120A (zh) * 2017-08-29 2017-11-17 广西容县顺垚仿古建陶有限公司 一种古建青砖的烧制设备

Also Published As

Publication number Publication date
ES2736039T3 (es) 2019-12-23
EP3006878B1 (fr) 2019-04-17
PL3006878T3 (pl) 2020-03-31

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