EP2195575A2 - Overheated steam generator - Google Patents

Overheated steam generator

Info

Publication number
EP2195575A2
EP2195575A2 EP08787068A EP08787068A EP2195575A2 EP 2195575 A2 EP2195575 A2 EP 2195575A2 EP 08787068 A EP08787068 A EP 08787068A EP 08787068 A EP08787068 A EP 08787068A EP 2195575 A2 EP2195575 A2 EP 2195575A2
Authority
EP
European Patent Office
Prior art keywords
segment
wound
generator according
electric resistor
rectilinear
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
EP08787068A
Other languages
German (de)
French (fr)
Other versions
EP2195575B1 (en
Inventor
Roberto Colombo
Angelo Irrera
Maurizio Biasi
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.)
IRCA SpA Industria Resistenze Corazzate e Affini
Original Assignee
IRCA SpA Industria Resistenze Corazzate e Affini
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 IRCA SpA Industria Resistenze Corazzate e Affini filed Critical IRCA SpA Industria Resistenze Corazzate e Affini
Publication of EP2195575A2 publication Critical patent/EP2195575A2/en
Application granted granted Critical
Publication of EP2195575B1 publication Critical patent/EP2195575B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22G—SUPERHEATING OF STEAM
    • F22G1/00—Steam superheating characterised by heating method
    • F22G1/16—Steam superheating characterised by heating method by using a separate heat source independent from heat supply of the steam boiler, e.g. by electricity, by auxiliary combustion of fuel oil
    • F22G1/165—Steam superheating characterised by heating method by using a separate heat source independent from heat supply of the steam boiler, e.g. by electricity, by auxiliary combustion of fuel oil by electricity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B1/00—Methods of steam generation characterised by form of heating method
    • F22B1/28—Methods of steam generation characterised by form of heating method in boilers heated electrically
    • F22B1/282—Methods of steam generation characterised by form of heating method in boilers heated electrically with water or steam circulating in tubes or ducts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22G—SUPERHEATING OF STEAM
    • F22G3/00—Steam superheaters characterised by constructional features; Details of component parts thereof
    • F22G3/005—Annular steam tubes, i.e. the steam being heated between concentric tubes with the heating fluid flowing in inner and around outer tube

Definitions

  • the present invention relates to a device for generating overheated steam.
  • State of the art Devices adapted to generate overheated steam comprise, in general, two stages: a first stage provides the latent heat for the water to evaporate; a second stage further heats the steam overheating it.
  • the heat may be transferred to the water by means of various heat generators, e.g. fossil fuel or combustible oils and by-products, including gases. Other heaters use electric energy.
  • a typical electric device for generating overheated steam includes a pipe about which an electric resistor is wound for a length such as to allow to transfer the heat necessary for the purpose. Such a device typology is particularly cumbersome and not very efficient due to the fact that a heat portion is transferred from the resistor to the environment instead of to the fluid.
  • Another overheated steam generator includes a first pipe through which the fluid flows, about which an electric winding is wound.
  • Said winding crossed by the electric current, generates a magnetic field which is interconnected both with the fluid circulating in said first pipe and with the fluid circulating in a further pipe externally and spirally wound thereabout, despite being electrically insulated therefrom.
  • the fluid is heated by the energy transferred to the fluid from the interconnected magnetic flux.
  • the magnetic induction is proportional to the number of turns and to the intensity of the circulating current, therefore in order to generate a sufficiently intense field, a winding made of a copper wire of large section and long length so as to form a great number of turns must be used.
  • the device object of the present invention is much more compact and efficient than the known devices. It is compact because the thickness of the electric resistor is small; furthermore, it is very efficient because said electric resistor transfers heat inside the first segment of the pipe and outside the second segment which is wound thereabout.
  • said device is easy to be applied when generating overheated steam is needed, despite having a small available space and limited energy resources.
  • Fig. 1 shows an axial plane section of the steam generator according to the invention.
  • a preferred embodiment of a overheated steam generator in accordance with the present invention includes: - a rectilinear pipe segment 1 ;
  • the fluid flow passes to the gaseous state, becoming wet steam, passing through said rectilinear segment and receiving, from said electric resistor, the heat which spreads inwards the cylindrical surface formed by the resistor. Subsequently, the fluid flow travels along said wound pipe segment which completely covers said electric resistor receiving the heat which is radially spread from the latter towards the external environment so as to become overheated steam. It is thus apparent that, before being able to reach the external environment, the heat must cross at least one further layer made of the pipe winding forming said wound segment, thus degrading.
  • the fluid flow is provided for crossing said device in the opposite direction as compared to what shown in the figure, so that the device externally has a temperature limited to the boiling temperature of the fluid itself, further increasing the performance of the device.
  • further layers of pipe winding 2 are provided for forming as many concentric tube bundles to further increase the performance of the device.
  • the external temperature of the device is almost that of the fluid entering the same, subsequently, as the fluid progressively flows through the increasingly more internal tube bundles of the pipe, the fluid gradually acquires more heat until the overheated steam stage is reached, until it is released from the rectilinear segment.
  • the electric resistor 3 in a section view should take a complementary course with respect to the tube bundle which is overlapping the rectilinear pipe segment, instead of forming a cylindrical layer or a solenoid, so as to fill the gaps between said rectilinear segment and said wound segment.
  • said course is sinusoidal.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Thermal Sciences (AREA)
  • Fluid Mechanics (AREA)
  • Resistance Heating (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Instantaneous Water Boilers, Portable Hot-Water Supply Apparatuses, And Control Of Portable Hot-Water Supply Apparatuses (AREA)

Abstract

A steam generator for the production of overheated steam, including a rectilinear pipe segment (1); an electric resistor (3) wound about said segment and supplied by an electric source; a wound pipe segment (2), one end of which is connected to said first rectilinear segment, onto which it is wound to form a cylindrical spiral which covers said electric resistor (3).

Description

OVERHEATED STEAM GENERATOR Field of the invention
The present invention relates to a device for generating overheated steam. State of the art Devices adapted to generate overheated steam comprise, in general, two stages: a first stage provides the latent heat for the water to evaporate; a second stage further heats the steam overheating it.
The heat may be transferred to the water by means of various heat generators, e.g. fossil fuel or combustible oils and by-products, including gases. Other heaters use electric energy. A typical electric device for generating overheated steam includes a pipe about which an electric resistor is wound for a length such as to allow to transfer the heat necessary for the purpose. Such a device typology is particularly cumbersome and not very efficient due to the fact that a heat portion is transferred from the resistor to the environment instead of to the fluid.
Another overheated steam generator includes a first pipe through which the fluid flows, about which an electric winding is wound.
Said winding, crossed by the electric current, generates a magnetic field which is interconnected both with the fluid circulating in said first pipe and with the fluid circulating in a further pipe externally and spirally wound thereabout, despite being electrically insulated therefrom. In such a device, the fluid is heated by the energy transferred to the fluid from the interconnected magnetic flux. It is known that the magnetic induction is proportional to the number of turns and to the intensity of the circulating current, therefore in order to generate a sufficiently intense field, a winding made of a copper wire of large section and long length so as to form a great number of turns must be used. It is apparent that such a solution determines a high cost for making the winding and considerable dimensions, in addition to the fact that the performance is theoretically low because the frequency of the grid to which a similar generator is connected is normally 50 Hz, which is a frequency far away from the resonance frequency of the water pole molecule; at which frequency, again theoretically, the performance would be unitary. Summary of the invention It is the object of the present invention to provide a overheated steam generator which is economically more advantageous to be made, while being characterized by a higher efficiency than the devices offered by the prior art. It is a further object to supply a particularly compact overheated steam generator. The present invention, therefore, intends to reach the afore-discussed objects by making a overheated steam generator, which according to claim 1 , includes:
- a rectilinear pipe segment;
- an electric resistor wound about said segment and supplied by an electric source; - a wound pipe segment, one end of which is connected to said first rectilinear segment, which is wound to form a cylindrical spiral which covers said electric resistor.
Advantageously, the device object of the present invention is much more compact and efficient than the known devices. It is compact because the thickness of the electric resistor is small; furthermore, it is very efficient because said electric resistor transfers heat inside the first segment of the pipe and outside the second segment which is wound thereabout.
Another advantage derives from the cost-effectiveness of the material which forms said electric resistor. According to a further aspect of the invention, said device is easy to be applied when generating overheated steam is needed, despite having a small available space and limited energy resources.
The dependent claims describe preferred embodiments of the invention.
Brief description of the drawings Further features and advantages of the present invention will be apparent in the light of the detailed description of a preferred, but not exclusive, embodiment of a overheated steam generator, illustrated by way of non-limitative example, with reference to the accompanying drawing, in which:
Fig. 1 shows an axial plane section of the steam generator according to the invention.
Detailed description of a preferred embodiment of the invention
A preferred embodiment of a overheated steam generator in accordance with the present invention includes: - a rectilinear pipe segment 1 ;
- an electric resistor 3 wound about said segment and supplied by an electric source;
- a wound pipe segment 2, one end of which is connected to said first rectilinear segment, which is wound to form a cylindrical spiral which covers said electric resistor.
The fluid flow passes to the gaseous state, becoming wet steam, passing through said rectilinear segment and receiving, from said electric resistor, the heat which spreads inwards the cylindrical surface formed by the resistor. Subsequently, the fluid flow travels along said wound pipe segment which completely covers said electric resistor receiving the heat which is radially spread from the latter towards the external environment so as to become overheated steam. It is thus apparent that, before being able to reach the external environment, the heat must cross at least one further layer made of the pipe winding forming said wound segment, thus degrading.
In another preferred embodiment, the fluid flow is provided for crossing said device in the opposite direction as compared to what shown in the figure, so that the device externally has a temperature limited to the boiling temperature of the fluid itself, further increasing the performance of the device.
In another preferred embodiment, further layers of pipe winding 2 are provided for forming as many concentric tube bundles to further increase the performance of the device. In this manner, the external temperature of the device is almost that of the fluid entering the same, subsequently, as the fluid progressively flows through the increasingly more internal tube bundles of the pipe, the fluid gradually acquires more heat until the overheated steam stage is reached, until it is released from the rectilinear segment.
Preferably, the electric resistor 3 in a section view should take a complementary course with respect to the tube bundle which is overlapping the rectilinear pipe segment, instead of forming a cylindrical layer or a solenoid, so as to fill the gaps between said rectilinear segment and said wound segment. Specifically, said course is sinusoidal. The particular embodiments herein described do not limit the content of this application which covers all the variants of the invention defined by the claims.

Claims

1. A steam generator, specifically for the production of overheated steam, including:
- a rectilinear pipe segment (1 ); - an electric resistor (3) wound about said segment and supplied by an electric source;
- a wound pipe segment (2), one end of which is connected to said first rectilinear segment, which is wound to form a cylindrical spiral which covers said electric resistor.
2. A generator according to claim 1 , wherein said wound pipe segment (2) forms a cylindrical spiral which forms at least one tube bundle layer.
3. A generator according to claim 2, wherein said tube bundle is formed by tubes placed side-by-side.
4. A generator according to claim 2, wherein further tube bundles formed by said wound pipe segment (2) are concentric.
5. A generator according to claim 1 , wherein said electric resistor (3) forms a solenoid.
6. A generator according to claim 1 , wherein said electric resistor (3) is made so as to take, in a section view, a complementary course with respect to the wound pipe segment, so as to fill the gaps between said rectilinear segment and said wound segment.
7. A generator according to claim 2, wherein said complementary course has a sinusoidal shape.
EP08787068.9A 2007-08-09 2008-08-08 Overheated steam generator Active EP2195575B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITRM20070434 ITRM20070434A1 (en) 2007-08-09 2007-08-09 OVERHEATED STEAM GENERATOR
PCT/EP2008/060484 WO2009019315A2 (en) 2007-08-09 2008-08-08 Overheated steam generator

Publications (2)

Publication Number Publication Date
EP2195575A2 true EP2195575A2 (en) 2010-06-16
EP2195575B1 EP2195575B1 (en) 2016-12-28

Family

ID=40299894

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08787068.9A Active EP2195575B1 (en) 2007-08-09 2008-08-08 Overheated steam generator

Country Status (3)

Country Link
EP (1) EP2195575B1 (en)
IT (1) ITRM20070434A1 (en)
WO (1) WO2009019315A2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6679818B2 (en) * 2017-03-07 2020-04-15 株式会社実践環境研究所 Pyrolysis system
US20220034501A1 (en) 2018-10-12 2022-02-03 Mustafa GÜMÜ Saturated/superheated steam or hot air generator

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB886189A (en) * 1959-02-26 1962-01-03 Atomic Energy Authority Uk Improvements in or relating to liquid evaporating apparatus
DE3120682A1 (en) * 1981-05-23 1982-12-16 Horst 5241 Elben Hammes Electrically heated forced-flow continuous heater
US5549078A (en) * 1994-11-21 1996-08-27 Annecharico; Robert L. Device for superheating steam
FR2878419B1 (en) * 2004-11-29 2007-01-19 Seb Sa INFUSION BEVERAGE DISPENSER COMPRISING AN IMPROVED BOILER AND METHOD OF MANUFACTURING THE SAME
US7552701B2 (en) * 2006-05-16 2009-06-30 Shell Oil Company Boiler for making super heated steam and its use

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2009019315A2 *

Also Published As

Publication number Publication date
WO2009019315A3 (en) 2009-04-23
WO2009019315A2 (en) 2009-02-12
EP2195575B1 (en) 2016-12-28
ITRM20070434A1 (en) 2009-02-10

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