EP3601908A1 - Hottes d'extraction de gaz froids sur tunnel de surgélation avec aspiration à ouverture réglable - Google Patents
Hottes d'extraction de gaz froids sur tunnel de surgélation avec aspiration à ouverture réglableInfo
- Publication number
- EP3601908A1 EP3601908A1 EP18715221.0A EP18715221A EP3601908A1 EP 3601908 A1 EP3601908 A1 EP 3601908A1 EP 18715221 A EP18715221 A EP 18715221A EP 3601908 A1 EP3601908 A1 EP 3601908A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- tunnel
- hood
- hoods
- extraction
- products
- 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.)
- Withdrawn
Links
- 238000000605 extraction Methods 0.000 title claims abstract description 31
- 238000007710 freezing Methods 0.000 title claims abstract description 9
- 230000008014 freezing Effects 0.000 title claims abstract description 9
- 238000009434 installation Methods 0.000 claims abstract description 13
- 239000012530 fluid Substances 0.000 claims abstract description 8
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 6
- 238000001816 cooling Methods 0.000 claims abstract description 4
- 238000007789 sealing Methods 0.000 claims 1
- 239000007789 gas Substances 0.000 abstract description 23
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000003517 fume Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 206010002660 Anoxia Diseases 0.000 description 1
- 241000976983 Anoxia Species 0.000 description 1
- 206010021143 Hypoxia Diseases 0.000 description 1
- 230000035508 accumulation Effects 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- 230000007953 anoxia Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D3/00—Devices using other cold materials; Devices using cold-storage bodies
- F25D3/10—Devices using other cold materials; Devices using cold-storage bodies using liquefied gases, e.g. liquid air
- F25D3/11—Devices using other cold materials; Devices using cold-storage bodies using liquefied gases, e.g. liquid air with conveyors carrying articles to be cooled through the cooling space
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D29/00—Arrangement or mounting of control or safety devices
- F25D29/001—Arrangement or mounting of control or safety devices for cryogenic fluid systems
Definitions
- the present invention relates to the field of extraction hoods equipping freezing tunnels.
- Freezing tunnels are usually provided with two hoods for extracting cold gases from the top of the tunnel shelter: one at the entrance to the tunnel and one at the exit of the tunnel, which serve to optimize the evacuation, out of the local, gases from the vaporization of cryogenic fluids implemented in the tunnel (usually nitrogen or CO2).
- This extraction system therefore has the role of evacuating the gases formed in the device and thus to ensure the safety of operators by protecting them from any risk of anoxia, while maintaining the productivity of the tunnels.
- tunnels are usually equipped with two fume hoods
- tunnels may be equipped with a single hood, or tunnels may operate with only one of their two fume hoods in operation. more often the one located at the entrance.
- the section of these hoods is traditionally rectangular in shape and the same width as that of the tunnel conveyor.
- each of these hoods must be correctly adjusted in order to suck the right amount of gas ie enough to avoid spreading the gases out of the tunnel and endangering the operators, but without excess suction for do not suck the cold gases out of the tunnel and then cause overconsumption of cryogenic fluid.
- the first is to alter the performance of the tunnel by causing excess nitrogen consumption because we suck cold tunnel gas before they had time to exchange their frigories, and
- the second concerns the right side of the tunnel, where hot gases are sucked from the humid ambient air of the room, which has the consequence of creating accumulations of frost in the extraction pipes and in the medium term of butcher.
- the present invention provides a suction structure whose suction section is changeable.
- the present invention proposes in fact to use one or hood (s) whose suction section can be adjusted over the width and the depth of the conveyor belt, according to the needs of good operation of the tunnel, and which can target increasing or decreasing the extraction rate on the desired area.
- This "obturation” or “obstruction” may be done for example by providing the suction section of a blind or actuatable shutter, operable manually by the operator or automated manner, for example by taking into account the measurement provided by a sensor capable of detecting an overflow or a gas emission at the inlet and / or outlet of the zone of the machine.
- This sensor may be an oxygen rate sensor, or a CO2 rate sensor, or a temperature sensor, or a light beam blocked by a fog.
- the present invention thus relates to a cryogenic cooling or cryogenic product freezing installation, comprising a cryogenic tunnel in which products for cooling or freezing circulate, between an entrance in the tunnel and an exit of the tunnel, the tunnel being equipped with injection means of a cryogenic fluid in the internal space of the tunnel where circulate the products using a conveyor belt, the installation further comprising means for extracting cold gases escaping from the tunnel, comprising one or more extraction hoods, and in particular a first upstream extraction hood; located opposite the entrance of the tunnel and / or a second downstream extraction hood located opposite the exit of the tunnel, characterized in that the installation comprises means for adjusting the suction section of the tunnel. at least one of said hoods over the width and depth of the conveyor belt of the tunnel.
- Figure 1 is a partial schematic view of a freezing tunnel according to the prior art
- FIG. 1 Figure 2 and Figure 3 illustrate embodiments of the invention.
- the installation comprises a tunnel 1 provided with a conveyor 2, able to transport the products to be treated between a tunnel entrance and a tunnel exit (the arrows 3 and 4 respectively symbolize the entry of the products and their exit).
- the tunnel is equipped with means 5 for injecting a cryogenic fluid into the internal space of the tunnel where the products circulate, here in particular constituted by means for supplying cryogen for spray bars of the fluid in the internal space, and further comprises ventilation means 6.
- the installation further comprises means for extracting cold gases escaping from the tunnel, constituted here by an upstream extraction hood 7 located opposite the tunnel entrance and a downstream extraction hood 8 located opposite the exit of the tunnel.
- the ducts of these two hoods 7 and 8 are returned to a common means 10 for recovery and evacuation to the outside. But in other embodiments currently practiced, these two hood ducts are discharged to the outside independently, without being collected in a common duct.
- FIG. 1 illustrates a configuration in which the ducts of the upstream and downstream extraction hoods are situated above the conveyor, it is perfectly possible to implement a configuration where the ducts of the extractor hoods upstream and / or downstream are located below the conveyor, or mixed way above and below the conveyor.
- Figure 2 and Figure 3 illustrate embodiments of the invention:
- FIG. 2 illustrates in its views a) to g) different section states of a hood (in view from below): not closed (a)) or closed (b) to g)), the shutter being for example made using a blind structure.
- the blind can open in a parallel way from right to left, generating a rectangle (b)), the blind can also open and close in a non-parallel manner and a triangle structure (s) facilitating the distinction of the left and right sides of the hood as sought above in the present description.
- FIG. 3 illustrates the fact that, thanks to the closure proposal according to the present invention, it is therefore possible to envisage connecting the extraction tube not at the top and in the middle of the hood, as currently practiced. , but on one side of the hood and natural dissymmetry can then be compensated by the system. We can then consider an extraction tube connected to one side of the tunnel (left or right) or even both simultaneously as shown in views w) and z) of Figure 3.
- the invention makes it possible to adjust the section of one or each of these hoods, independently.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1752572A FR3064728B1 (fr) | 2017-03-28 | 2017-03-28 | Hottes d'extraction de gaz froids sur tunnel de surgelation avec aspiration a ouverture reglable |
| PCT/FR2018/050691 WO2018178541A1 (fr) | 2017-03-28 | 2018-03-22 | Hottes d'extraction de gaz froids sur tunnel de surgélation avec aspiration à ouverture réglable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP3601908A1 true EP3601908A1 (fr) | 2020-02-05 |
Family
ID=58739230
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP18715221.0A Withdrawn EP3601908A1 (fr) | 2017-03-28 | 2018-03-22 | Hottes d'extraction de gaz froids sur tunnel de surgélation avec aspiration à ouverture réglable |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US20200096244A1 (fr) |
| EP (1) | EP3601908A1 (fr) |
| FR (1) | FR3064728B1 (fr) |
| WO (1) | WO2018178541A1 (fr) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4171625A (en) * | 1977-11-02 | 1979-10-23 | Formax, Inc. | Cryogenic freezing tunnel |
| JPS6020671B2 (ja) * | 1978-01-13 | 1985-05-23 | 昭和炭酸株式会社 | 食品の急速冷凍法およびその装置 |
| JPS568276U (fr) * | 1979-02-07 | 1981-01-24 | ||
| DE4022311C1 (fr) * | 1990-07-13 | 1992-01-09 | Kohlensaeure-Werke Rud. Buse Gmbh & Co, 5462 Bad Hoenningen, De | |
| FR3037134A1 (fr) * | 2015-06-03 | 2016-12-09 | Air Liquide | Doubles hottes d'extraction de gaz froids equipant un tunnel de surgelation |
-
2017
- 2017-03-28 FR FR1752572A patent/FR3064728B1/fr active Active
-
2018
- 2018-03-22 EP EP18715221.0A patent/EP3601908A1/fr not_active Withdrawn
- 2018-03-22 US US16/498,656 patent/US20200096244A1/en not_active Abandoned
- 2018-03-22 WO PCT/FR2018/050691 patent/WO2018178541A1/fr not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| FR3064728A1 (fr) | 2018-10-05 |
| WO2018178541A1 (fr) | 2018-10-04 |
| US20200096244A1 (en) | 2020-03-26 |
| FR3064728B1 (fr) | 2020-07-17 |
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