EP2522402A1 - Feuerbekämpfungssystem - Google Patents

Feuerbekämpfungssystem Download PDF

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Publication number
EP2522402A1
EP2522402A1 EP12002762A EP12002762A EP2522402A1 EP 2522402 A1 EP2522402 A1 EP 2522402A1 EP 12002762 A EP12002762 A EP 12002762A EP 12002762 A EP12002762 A EP 12002762A EP 2522402 A1 EP2522402 A1 EP 2522402A1
Authority
EP
European Patent Office
Prior art keywords
environment
inert gas
points
sampling
regions
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
EP12002762A
Other languages
English (en)
French (fr)
Other versions
EP2522402B1 (de
Inventor
Marco Pruneri
Andrea Vlaic
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.)
ISOLCELL S.P.A.
Original Assignee
ISOLCELL ITALIA SpA
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Publication of EP2522402A1 publication Critical patent/EP2522402A1/de
Application granted granted Critical
Publication of EP2522402B1 publication Critical patent/EP2522402B1/de
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    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62C—FIRE-FIGHTING
    • A62C37/00—Control of fire-fighting equipment
    • A62C37/36—Control of fire-fighting equipment an actuating signal being generated by a sensor separate from an outlet device
    • A62C37/38—Control of fire-fighting equipment an actuating signal being generated by a sensor separate from an outlet device by both sensor and actuator, e.g. valve, being in the danger zone
    • A62C37/40—Control of fire-fighting equipment an actuating signal being generated by a sensor separate from an outlet device by both sensor and actuator, e.g. valve, being in the danger zone with electric connection between sensor and actuator
    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62C—FIRE-FIGHTING
    • A62C99/00—Subject matter not provided for in other groups of this subclass
    • A62C99/0009—Methods of extinguishing or preventing the spread of fire by cooling down or suffocating the flames
    • A62C99/0018—Methods of extinguishing or preventing the spread of fire by cooling down or suffocating the flames using gases or vapours that do not support combustion, e.g. steam, carbon dioxide

Definitions

  • the present invention relates to a fire-fighting system.
  • the detection of the residual oxygen values inside the enclosed space is performed by means of sensors which draw the air to be analyzed simultaneously from multiple intakes.
  • the air is mixed unintentionally within the sampling duct and is analyzed.
  • the residual oxygen value obtained from the analysis is then compared with an objective value, and if the objective value is lower than the found value the mechanism for introducing nitrogen into the environment is activated.
  • sensors which, as explained above, collect and mix in the collection duct the samples of multiple sampling points.
  • the sensors and/or points for sampling from the environment to be protected are distributed on the walls in a more or less constant manner.
  • the introduction of nitrogen into the environment occurs always at a delivery point, regardless of the size of the environment to be protected, assuming that the nitrogen introduced in the enclosed space, due to the known physical property of gases, tends to mix with the gas that is present within the environment to be protected and tends to create a mix that has a more or less constant residual oxygen content.
  • the first factor relates to the fact that the mixing of the nitrogen introduced at the delivery point with the remainder of the atmosphere inside the environment occurs in a non-negligible finite time, which is directly proportional to the size of the environment. Because of this, at each instant within environments of medium or large size there are residual oxygen concentrations that can even be significantly different from each other.
  • the second factor relates to the fact that oxygen is heavier than nitrogen and therefore tends to stratify with respect to nitrogen. This phenomenon therefore increases in practice the effects of the first factor, facilitating the creation of regions with different oxygen concentrations within a same enclosed space.
  • the third factor consists in that no environment is perfectly hermetic and nitrogen escapes from the environment to be protected, not only through the necessary and provided openings, for example doors, which every environment necessarily has, but also through cracks, sockets, electrical ducts, gaps and in general through countless other openings which are not intended, not desired and/or not considered both during design and during the practical execution of the environments to be protected.
  • This third factor facilitates the creation of regions having a different residual oxygen gradient.
  • DE19934118 discloses a system and apparatus for extinguishing tunnel fires, wherein the tunnel is split into different areas and has separators which in turn have concentration areas forming an inert area.
  • a container holds the inert gas and is situated in the walls of the tunnel, in whose walls inlet openings or other flow apparatus are situated. Separators are formed via mechanical devices.
  • the aim of the present invention is to provide a fire-fighting system based on the introduction of inert gas such as nitrogen which overcomes the drawbacks of the cited prior art.
  • an object of the invention is to provide a fire-fighting system which is capable of optimizing the introduction of nitrogen and/or of any inerting gas for the purpose of active fire prevention, within an environment, so as to direct the nitrogen directly where a gap might occur which might allow an outward gas leak.
  • Another object of the invention is to provide a fire-fighting system that allows to minimize the introduction of nitrogen or other inert gas that is required to maintain a certain residual oxygen content within an environment and therefore to reduce energy consumption considerably, with respect to the conventional systems known so far and applied to environments of substantial size.
  • a further object of the present invention is to provide a fire-fighting system that ensures a constancy and uniformity of the residual oxygen value in the entire volume of the environment to be protected, without the need to install fans or other ventilation equipment, contrary to conventional systems wherein an auxiliary ventilation is required in order to ensure this uniformity.
  • a further object of the present invention is to provide a system which, by virtue of its particular constructive characteristics, is capable of giving the greatest assurances of reliability and safety in use.
  • a further object of the present invention is to provide a system that can be provided easily by using commonly commercially available elements and materials and is also competitive from an economic standpoint.
  • a fire-fighting system comprising a network distributing inert gas into a closed environment through injection points; a plurality of sampling points that take samples of atmosphere in said closed environment in order to measure the quantity of oxygen that is present; an inert gas generator connected to said injection points; an oxygen analyzer connected to said sampling points; said inert gas generator being controlled by said oxygen analyzer so as to send inert gas to the injection points when the oxygen content measured by said sampling points exceeds a preset value; said system being characterized in that it comprises a virtual grid which divides said environment into a plurality of regions having variable dimensions: smaller regions at openings of said environment toward the outside, and larger regions where there are no openings; each region comprises at least one injection point and at least one sampling point; said sampling point of each region being distant from the respective injection point.
  • the fire-fighting system according to the invention is applicable advantageously to a closed environment, generally designated by the reference numeral 1, which is constituted for example by a large environment, on the order of 10,000 m 3 to 500,000 m 3 .
  • the environment 1 is divided by means of a virtual grid, shown schematically by dashed lines 2 in the figures, which has a variable spacing, i.e., defining regions having different dimensions.
  • the grid 2 is used to sensibly arrange the sampling points 4 in order to perform ambient air analyses.
  • the grid has a tighter spacing, i.e., smaller regions, where openings 3 of the environment to be protected are defined, and has a wider spacing, i.e., larger regions, where no openings are provided in the environment.
  • sampling points 4 are arranged at different heights, within each region identified by the grid 2, and are connected to a control unit with an analyzer 12 by means of sampling ducts 13.
  • sampling points 4 allow to highlight very precisely, throughout the life of the fire-fighting system, the critical points of the environment 1 to be protected. Accordingly, it is very easy to verify locally, within a large environment, the regions where it is desirable to intervene in order to restore locally the desired level of isolation in the environment 1.
  • the grid 2 also allows to arrange an inert gas distribution network that intervenes locally, where the increase in the oxygen level has occurred. Local intervention on the gas leak allows to reduce the quantity of inert gas, that is introduced in the environment 1, to the minimum quantity required in order to restore the local balance at the desired values of residual oxygen.
  • the intervention inertia of the preservation system is very small.
  • the fire prevention system in fact does not wait for the oxygen that has entered the environment to propagate and dilute most of the protective atmosphere that is present within the environment, but acts immediately exactly at the point where the problem is occurring, consequently containing the impact of the problem to the region where it has been detected.
  • the system according to the invention also comprises a network for the distribution of the protective gas which allows to uniformly distribute the gas within the environment volume.
  • the inerting gas is distributed by means of a distribution network which comprises T members 5 which are mutually connected and are fed by a central nitrogen generation unit 9 which is connected to the T members by means of feed pipes 11.
  • Each T member has injection points 6 which are controlled by automatic valves 7, driven by the analysis and monitoring software of the prevention system.
  • a characteristic of this distribution system is that the gas injection points 6 are distributed on a matrix, like the residual environment oxygen sampling points 4, but are offset with respect to the sampling points, in order to prevent a short-circuiting between the analysis of the residual oxygen and the introduction of inert gas/nitrogen, which would hide the actual severity and diffusion of an isolation problem of the environment to be protected.
  • the distribution system according to the present invention optimizes the quantity of inert gas that is introduced in the environment, which is conveyed only where it is actually necessary, therefore reducing its consumption.
  • the system therefore reduces the energy consumption required to keep the environment 1 safe.
  • the system also allows a reduction of the gradients of the different values of residual oxygen within the environment and a greater uniformity of the residual oxygen value, to be maintained within the environment, ensuring that regions with oxygen values out of control and/or out of the safe zone are not present within the environment.
  • an inert gas lighter than air is used, for example nitrogen, and the distribution system is provided at zero height; i.e., at the level of the floor of the environment to be protected.
  • a further characteristic of the present invention is that part of the mixture, that is present within the environment 1, is drawn directly from the partitioning regions dedicated to the operating intakes 3 and is then reused, mixed with the external air, in the nitrogen generators in order to improve their efficiency.
  • the environment 1 has mainly two types of openings: safety doors-openings 3, which are intended indeed for the safe evacuation of people in case of emergency, and "work door” openings, designated by the reference numeral 33, which are intended for normal access to the structure and through which people and goods normally pass ( Figure 1 ).
  • the double door system reduces the inflow of oxygen into the environment to be protected.
  • partitioned region that has a clearly defined residual oxygen content, the value of which can be designed so as to be as close as one wishes to the content that is present outside the environment to be protected, approximately 20.9%, or to the value that is present within the environment 1 to be protected, for example 15%.
  • the nitrogen generators generate an oxygen-poor gas mix, which therefore is nitrogen-rich, starting from a gas mix that already initially has a lower oxygen level than the ambient atmosphere.
  • Another advantage of this system is the improvement of the efficiency of the partitioned region, as a barrier to the inflow of oxygen into the environment to be protected, during the normal operation and life of the system.
  • the installation of the system according to the present invention is also substantially more economic than the installation of a traditional water-based system (sprinklers).

Landscapes

  • Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Fire-Extinguishing By Fire Departments, And Fire-Extinguishing Equipment And Control Thereof (AREA)
  • Respiratory Apparatuses And Protective Means (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
EP12002762.8A 2011-04-21 2012-04-20 Feuerbekämpfungssystem Active EP2522402B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT000686A ITMI20110686A1 (it) 2011-04-21 2011-04-21 Impianto antincendio

Publications (2)

Publication Number Publication Date
EP2522402A1 true EP2522402A1 (de) 2012-11-14
EP2522402B1 EP2522402B1 (de) 2016-05-11

Family

ID=44554089

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12002762.8A Active EP2522402B1 (de) 2011-04-21 2012-04-20 Feuerbekämpfungssystem

Country Status (4)

Country Link
EP (1) EP2522402B1 (de)
ES (1) ES2585831T3 (de)
IT (1) ITMI20110686A1 (de)
PT (1) PT2522402T (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT201900004005A1 (it) 2019-03-19 2020-09-19 Mozzanica & Mozzanica S R L Impianto di prevenzione incendi con sistema a riduzione d’ossigeno

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH572752A5 (de) * 1974-12-19 1976-02-27 Cerberus Ag
DE19934118A1 (de) 1999-07-21 2001-02-01 Wagner Alarm Sicherung Verfahren und Vorrichtung zum Löschen von Bränden in Tunneln
US20030058114A1 (en) * 2001-09-21 2003-03-27 Miller Mark S. Fire detection system
WO2003056325A1 (de) * 2001-12-28 2003-07-10 Wagner Alarm-Und Sicherungssysteme Gmbh Verfahren und vorrichtung zur messung des sauerstoffgehaltes in einem abgeschlossenen zielraum

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH572752A5 (de) * 1974-12-19 1976-02-27 Cerberus Ag
DE19934118A1 (de) 1999-07-21 2001-02-01 Wagner Alarm Sicherung Verfahren und Vorrichtung zum Löschen von Bränden in Tunneln
US20030058114A1 (en) * 2001-09-21 2003-03-27 Miller Mark S. Fire detection system
WO2003056325A1 (de) * 2001-12-28 2003-07-10 Wagner Alarm-Und Sicherungssysteme Gmbh Verfahren und vorrichtung zur messung des sauerstoffgehaltes in einem abgeschlossenen zielraum

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT201900004005A1 (it) 2019-03-19 2020-09-19 Mozzanica & Mozzanica S R L Impianto di prevenzione incendi con sistema a riduzione d’ossigeno

Also Published As

Publication number Publication date
EP2522402B1 (de) 2016-05-11
ES2585831T3 (es) 2016-10-10
ITMI20110686A1 (it) 2012-10-22
PT2522402T (pt) 2016-08-12

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