EP3121521A1 - Heizvorrichtung mit heizstrahlern - Google Patents

Heizvorrichtung mit heizstrahlern Download PDF

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Publication number
EP3121521A1
EP3121521A1 EP16180647.6A EP16180647A EP3121521A1 EP 3121521 A1 EP3121521 A1 EP 3121521A1 EP 16180647 A EP16180647 A EP 16180647A EP 3121521 A1 EP3121521 A1 EP 3121521A1
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EP
European Patent Office
Prior art keywords
section
burner
fume
closed loop
heating plant
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
EP16180647.6A
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English (en)
French (fr)
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EP3121521B1 (de
Inventor
Oscar Pallaro
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Individual
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Individual
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D5/00—Hot-air central heating systems; Exhaust gas central heating systems
    • F24D5/06—Hot-air central heating systems; Exhaust gas central heating systems operating without discharge of hot air into the space or area to be heated
    • F24D5/08—Hot-air central heating systems; Exhaust gas central heating systems operating without discharge of hot air into the space or area to be heated with hot air led through radiators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D19/00—Details
    • F24D19/10—Arrangement or mounting of control or safety devices
    • F24D19/1084—Arrangement or mounting of control or safety devices for air heating systems
    • 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
    • F24H15/00—Control of fluid heaters
    • F24H15/30—Control of fluid heaters characterised by control outputs; characterised by the components to be controlled
    • F24H15/305—Control of valves
    • F24H15/31—Control of valves of valves having only one inlet port and one outlet port, e.g. flow rate regulating valves
    • 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
    • F24H15/00—Control of fluid heaters
    • F24H15/30—Control of fluid heaters characterised by control outputs; characterised by the components to be controlled
    • F24H15/355—Control of heat-generating means in heaters
    • F24H15/36—Control of heat-generating means in heaters of burners
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D2200/00—Heat sources or energy sources
    • F24D2200/16—Waste heat
    • F24D2200/18—Flue gas recuperation

Definitions

  • the present invention regards a heating plant with radiating strips, according to the preamble of the main independent claim.
  • the present plant is advantageously intended to be employed in an industrial or commercial context for heating, in particular, large-size building premises both for a total heating and for heating partial areas of the building premises.
  • Such plants of known type conventionally comprise closed loop radiating ducts, termed "radiating strips" in the jargon of the field, which are connected to a burner, in which a comburent mixture composed of air and gas is made to burn.
  • Such mixture produces a flow of high-temperature combustion products which is introduced into the closed loop of the radiating ducts.
  • the aforesaid loop of the plant is intercepted by a fan advantageously placed close to and upstream of the burner in a manner so as to subject the entire radiating loop to a reduced pressure susceptible also of maintaining the safety of the plant.
  • the flow of burnt gases produced by the burner is mixed in the closed loop with a flow of combustion products already introduced and in circulation, heating the latter, so as to form a heating carrier fluid that is made to circulate under reduced pressure by the action of the fan.
  • the burners employed in such plants are conventionally provided with a combustion chamber, in which the comburent mixture, formed by air and gas, bums at a combustion head, generating a fume carrier fluid that is made to circulate within the radiating tubes together with the previously-produced circulation fumes.
  • the cooler recirculation fumes are mixed with the hotter fumes produced by the burner and together they are made to circulate by the fan, which maintains the entire loop under reduced pressure conditions.
  • the fan circulates in the loop a carrier fluid flow formed partly by the very hot new burnt gases produced by the burner and partly by the cooler recirculation burnt gases which have already partly exchanged their heat with the radiating tubes during the circulation thereof.
  • the plant thus configured is particularly safe given that the burner is usually placed outside of the building premises to be heated and the radiating tubes are, as stated, under reduced pressure so as to prevent any possibility of dispersion of the fumes into the environment to be heated.
  • the carrier fluid is also mixed with air coming from the outside environment, which enters through the mechanical joints between the components that form the loop (bends, nipples, dilators, etc.).
  • Such infiltration of secondary air involves an increase of the oxygen content in the circulation carrier fluid, with consequent decrease of the performance of combustion measured on the fumes expelled at the stack, the latter positioned at the end of the radiating loop, more precisely between the fan and the burner.
  • the patent GB 2109104 describes a further example of heating plant with radiating strips of known type, which comprises a closed loop intercepted by a burner, and a stack connected to a terminal section of the closed loop. The plant is also provided with a probe for measuring the quantity of exhaust fumes expelled through the stack.
  • the main object of the present invention is to overcome the drawbacks of the above-described prior art, with a heating plant with radiating strips that is capable of improving the combustion performance measured on the fumes expelled at the stack.
  • Further object of the present invention is to present a heating plant with radiating strips, which is entirely safe in operation.
  • reference number 1 overall indicates a heating plant with radiating strips in accordance with a preferred embodiment of the present invention.
  • This is intended to be mainly employed in ambient climate-control by means of irradiation, in an industrial and commercial context.
  • the heating plant 1, object of the present invention comprises a closed loop 5 of radiating ducts, which are usually extended hung below a covering/roofing over the entire area that one wishes to heat via irradiation.
  • the aforesaid radiating ducts known with the term radiating strips, are obtained with metal tubes with high thermal transmission and are extended with a length that, in accordance with requirements, can usually vary from several dozen meters up to even 100-150 meters.
  • the aforesaid closed loop 5 conveys, at its interior, a carrier fluid 9' of very hot combustion products, which heat the tubes of the closed loop, irradiating heat into the outside environment to be heated.
  • such closed loop 5 is intercepted by a burner 2 which can advantageously also be placed outside the environment 19 of the building premises to be heated.
  • the burner 2 comprises, in a per se conventional manner, a combustion chamber 8, in which the combustion of a mixture formed by at least one air flow A and by at least one gas flow G occurs.
  • the combustion of such mixture determines the production of high-temperature combustion products which are introduced into the carrier fluid 9' in order to heat it.
  • the closed loop 5 is also intercepted by at least one fan 6 placed upstream of the burner 2, in order to make the reduced-pressure carrier fluid 9' circulate within the closed loop 5 from the burner 2 to the same fan 6.
  • the closed loop 5 is provided with a suctioned section 5 ", which is extended starting from the combustion chamber 8 of the burner 2, and with a terminal section 5', which is advantageously extended as a continuation of the suctioned section 5".
  • the fan 6 is associated with the terminal section 5' of the closed loop 5 of smaller length than the remaining suctioned section 5" in order to make the reduced-pressure carrier fluid 9' circulate along most of the loop. More in detail the fan 6 is placed close to the burner 2.
  • the heating plant 1, in accordance with the present invention, also comprises a fume expulsion duct 11 which is connected to the closed loop 5 in order to expel, into the outside environment, a part 10 of the carrier fluid 9.
  • the fume expulsion duct 11 is connected to the closed loop 5 in a connection position, indicated with 23 in the figures, which delimits with the combustion chamber 8 an initial section 5'" of the suctioned section 5".
  • Such fume expulsion duct 11 is also intercepted by an aspirator 3 and by means for detecting the composition of the fumes 13.
  • the aspirator 3 assists the draft of the combustion chamber 8, facilitating the formation of a longer flame with an improved combustion and simultaneously forces outward the part 10 of the carrier fluid 9 that must be substituted and that - not having traversed most of the closed loop 5 - is indicative of the quality of the combustion, since it has not been contaminated by infiltrations of outside air.
  • the means for detecting the composition of the fumes 13 are particularly indicative of the quality of the combustion that took place in the chamber 8.
  • the carrier fluid 9' that circulates in the closed loop 5 is therefore in part restored by hot fumes emitted by the combustion chamber 8 and in part reduced by the removal of the part 10 of the carrier fluid 9 which is extracted (close to the same burner) from the fume expulsion duct 11.
  • the portion 9' of carrier fluid 9 that carries out the complete circulation of the closed loop 5 is pushed by the fan 6 to a lower temperature in the combustion chamber 8, having transferred its heat to the radiating tubes of the closed loop and also having been at least in part mixed with the air suctioned from the environment through the joints present in the loop itself.
  • the heating plant provides that the initial section 5"' of the suctioned section 5 " is extended for less than a quarter of the suctioned section 5" of the closed loop 5 since the connection of the fume expulsion duct 11 to the closed loop 5 is preferably placed close to the burner 2 (e.g. at a distance variable between 50 cm and 5 meters).
  • the fume expulsion duct 11 is intercepted by a condensation heat exchanger 15 of air/air type 16.
  • the latter is traversed by a flow of ambient air 21 and is thus susceptible of drawing heat from the fumes 10 drawn by the aspirator 3 from the carrier fluid 9 which flows in the initial section 5"' of the suctioned section 5" of the closed loop 5 in order to transfer such heat directly into the environment.
  • the fume expulsion duct 11 is instead differently intercepted by a condensation heat exchanger 15 of air/water type 17.
  • the latter is then traversed by a water flow 20 susceptible of drawing heat from the fumes 10 drawn by the aspirator 3 from the carrier fluid 9 that flows in the initial section 5"' of the suctioned section 5" of the closed loop 5, and of transferring such heat to the water flow, e.g. for sanitary use or preferably as second carrier flow adapted to heat settings with further hot water / air exchangers such as fan coil units, radiators or the like.
  • the abovementioned means for detecting the composition of the fumes 13 are situated at the interception of the fume expulsion duct 11 downstream of the fume aspirator 3 and advantageously comprise a well for carrying out the fume combustion analysis.
  • the means for detecting the composition of the fumes 13 comprise a combustion analyzer, e.g. with infrared sensor, or a lambda probe, preferably connected to the aforesaid well in order to intercept the part 10 of carrier fluid 9 extracted by means of the fume expulsion duct 11.
  • a combustion analyzer e.g. with infrared sensor, or a lambda probe
  • the heating plant 1 comprises control means 7 operatively connected to the burner 2 and arranged for controlling the air A/gas G ratio of the comburent mixture present inside the combustion chamber 8 of the burner 2.
  • control means 7 comprise first supply means 7' operatively connected to the burner 2 and adapted to feed the combustion chamber 8 of the burner 2 with the aforesaid air flow A.
  • the first supply means 7' comprise a first feed duct connected to the burner 2 and intended to be connected to an air source (e.g. the outside environment), and a first control valve, e.g. of shutter type, placed to intercept the aforesaid first feed duct and drivable to regulate the air flow A that traverses such first feed duct.
  • an air source e.g. the outside environment
  • a first control valve e.g. of shutter type
  • control means 7 comprise second supply means 7" operatively connected to the burner 2 and adapted to feed the combustion chamber 8 of the burner 2 with the aforesaid gas flow G.
  • the second supply means 7" comprise a second feed duct connected to the burner 2 and intended to be connected to a gas source (such as a gas distribution network), and a second control valve (e.g. a solenoid valve) placed to intercept the aforesaid second feed duct and drivable to regulate the gas flow G that traverses such second feed duct.
  • a gas source such as a gas distribution network
  • a second control valve e.g. a solenoid valve
  • the heating plant comprises a control unit (not illustrated in the enclosed figures) operatively connected to the means for detecting the composition of the fumes 13 in order to receive measurements indicative of the composition of the fumes, and operatively connected to the control means 7 in order to drive, as a function of the measurements received by the means for detecting the composition of the fumes 13, such control means 7 to regulate the air A/gas G ratio in the comburent mixture inside the combustion chamber 8 of the burner 2.
  • a control unit (not illustrated in the enclosed figures) operatively connected to the means for detecting the composition of the fumes 13 in order to receive measurements indicative of the composition of the fumes, and operatively connected to the control means 7 in order to drive, as a function of the measurements received by the means for detecting the composition of the fumes 13, such control means 7 to regulate the air A/gas G ratio in the comburent mixture inside the combustion chamber 8 of the burner 2.
  • control unit comprises a control unit, for example provided with at least one circuit board.
  • control unit is operatively connected to the first supply means 7' in order to drive, as a function of the measurements received by the means for detecting the composition of the fumes 13, the first supply means 7' to regulate the air flow A supplied to the combustion chamber 8 of the burner 2.
  • control unit of the heating plant 1 is able to control the air/gas ratio inside the combustion chamber 8 in order to optimize the efficiency of the plant 1 and/or ensure the appropriate safety conditions tied to the exhaust emissions.
  • the control unit drives the first supply means 7' to reduce the air flow A to the combustion chamber 8 in order to ensure an efficient combustion of the gas G conveyed to the combustion chamber 8 itself.
  • control unit is operatively connected to the second supply means 7" in order to drive the latter to regulate the gas flow G supplied to the combustion chamber 8 of the burner 2, in particular as a function of the desired delivery power.
  • one or more first fans 18 are advantageously arranged that are adapted to send a flow of ambient air 19 (i.e. drawn from the same environment of the building premises where the plant 1 is housed) towards the fume expulsion duct 11 in order to heat and destratify the same ambient air.
  • a flow of ambient air 19 i.e. drawn from the same environment of the building premises where the plant 1 is housed
  • the plant in accordance with the embodiment of figure 5 , can also comprise one or more second fans 18' susceptible of sending a flow of ambient air 19 towards the suctioned section 5" of the closed loop 5 downstream of the initial section 5"'.
  • connection 23 of the fume expulsion duct 11 to the loop 5 is situated downstream of the combustion chamber 8, in a manner such that the composition of the carrier fluid 10 drawn for expulsion is not affected by the oxygen percentage of the ambient air which, being infiltrated through the joints along the entire reduced-pressure loop 5", is mixed with the carrier fluid 9' circulating in the radiating ducts.
  • oxygen percentage present in the recirculation carrier fluid 9' contributes to the completion of the combustion in chamber 8 and hence is not subsequently present in the fumes 10 that are drawn immediately downstream of the combustion chamber 8 itself by means of suitable fume duct 11 intercepted by an aspirator 3.
  • a condensation heat recuperator 15 can be positioned, constituted by an air/air type exchanger 16, or preferably by an air/water type exchanger 17.
  • first fans 18 in proximity to the duct 11 for drawing part of the burnt gases to be expelled and, preferably, of the second fans 18' in proximity to the radiating loop 5" has the function of destratifying the surrounding ambient air, more precisely drawing hotter ambient air 19 into the top zone of the room and directing it towards the bottom part of the same, improving the heat comfort of the people present and also reducing the overall energy consumptions.
  • the presence of the condensation heat recuperator 15 on the fume drawing and expulsion duct 11 allows lowering the temperature of the fumes 10 to be expelled. All this allows, in addition to having a greater combustion performance, being able to increase the carrier fluid recirculation flow 9' within the radiating loop 5" with the advantage of an increased temperature uniformity over the entire length of the radiating loop 5". From a greater carrier fluid flow 9' there derives a greater average temperature thereof, the latter condition acceptable since it does not affect the temperature value of the burnt gases 10 exiting the expulsion duct 11, for the calculation of the combustion performance.

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  • 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)
  • Fluid Mechanics (AREA)
EP16180647.6A 2015-07-24 2016-07-21 Heizvorrichtung mit heizstrahlern Active EP3121521B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITUB2015A002466A ITUB20152466A1 (it) 2015-07-24 2015-07-24 Impianto di riscaldamento a nastri radianti

Publications (2)

Publication Number Publication Date
EP3121521A1 true EP3121521A1 (de) 2017-01-25
EP3121521B1 EP3121521B1 (de) 2021-03-03

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EP16180647.6A Active EP3121521B1 (de) 2015-07-24 2016-07-21 Heizvorrichtung mit heizstrahlern

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EP (1) EP3121521B1 (de)
IT (1) ITUB20152466A1 (de)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2109104A (en) 1981-11-05 1983-05-25 Radiant Tube Syst Space heating system
EP0079526A1 (de) * 1981-11-03 1983-05-25 G + H MONTAGE GmbH Strahlungsheizungsanlage mit direkt befeuerter Brennkammer
GB2324146A (en) * 1997-04-11 1998-10-14 Jones Philomena Joan Radiant tube heater
DE102007047661A1 (de) * 2007-09-18 2009-03-26 Kübler Gmbh Verfahren und Anordnung zum Beheizen von Gebäuden mit einer Infrarot-Heizung
WO2011036645A1 (en) 2009-09-25 2011-03-31 Officine Termotecniche Fraccaro S.R.L. High efficiency device for heating environments and heating system comprising such device
EP2397781A1 (de) * 2011-01-27 2011-12-21 GoGaS Goch GmbH & Co. KG Wärmetauscher
GB2486359A (en) * 2010-10-29 2012-06-13 Tacoma Properties Llc Micro combined heat and power unit with solenoid fuel control valve

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2704659A1 (de) * 1977-02-04 1978-08-10 Heinz Wobbermin Einrichtung zur automatischen ueberwachung von anlagen mit gasfoermigen und fluessigen brennstoffen auf dichtheit

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0079526A1 (de) * 1981-11-03 1983-05-25 G + H MONTAGE GmbH Strahlungsheizungsanlage mit direkt befeuerter Brennkammer
GB2109104A (en) 1981-11-05 1983-05-25 Radiant Tube Syst Space heating system
GB2324146A (en) * 1997-04-11 1998-10-14 Jones Philomena Joan Radiant tube heater
DE102007047661A1 (de) * 2007-09-18 2009-03-26 Kübler Gmbh Verfahren und Anordnung zum Beheizen von Gebäuden mit einer Infrarot-Heizung
WO2011036645A1 (en) 2009-09-25 2011-03-31 Officine Termotecniche Fraccaro S.R.L. High efficiency device for heating environments and heating system comprising such device
GB2486359A (en) * 2010-10-29 2012-06-13 Tacoma Properties Llc Micro combined heat and power unit with solenoid fuel control valve
EP2397781A1 (de) * 2011-01-27 2011-12-21 GoGaS Goch GmbH & Co. KG Wärmetauscher

Also Published As

Publication number Publication date
ITUB20152466A1 (it) 2017-01-24
EP3121521B1 (de) 2021-03-03

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