EP1552234B1 - Heat recovery tower - Google Patents

Heat recovery tower Download PDF

Info

Publication number
EP1552234B1
EP1552234B1 EP03732604A EP03732604A EP1552234B1 EP 1552234 B1 EP1552234 B1 EP 1552234B1 EP 03732604 A EP03732604 A EP 03732604A EP 03732604 A EP03732604 A EP 03732604A EP 1552234 B1 EP1552234 B1 EP 1552234B1
Authority
EP
European Patent Office
Prior art keywords
heat recovery
recovery tower
units
tower according
air
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.)
Expired - Lifetime
Application number
EP03732604A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1552234A1 (en
Inventor
Kalle Helenius
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.)
Valmet Technologies Oy
Original Assignee
Metso Paper Oy
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 Metso Paper Oy filed Critical Metso Paper Oy
Publication of EP1552234A1 publication Critical patent/EP1552234A1/en
Application granted granted Critical
Publication of EP1552234B1 publication Critical patent/EP1552234B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/006—Layout of treatment plant
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2217/00—Intercepting solids
    • F23J2217/50—Intercepting solids by cleaning fluids (washers or scrubbers)
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L2900/00—Special arrangements for supplying or treating air or oxidant for combustion; Injecting inert gas, water or steam into the combustion chamber
    • F23L2900/15043—Preheating combustion air by heat recovery means located in the chimney, e.g. for home heating devices

Definitions

  • the invention relates to a heat recovery tower for recovering heat energy from the gas generated in an industrial plant.
  • US-A-4 774 033 discloses a tower structure for gas-liquid interaction.
  • One embodiment of the structure comprises, from the bottom upwards, a rain chamber, an interaction unit a rinse unit and a drift eliminator.
  • the object of the invention to provide a structure that does not have the above-mentioned disadvantages, i.e. that can be applied when renovating old factories, thereby increasing the heat recovery efficiency and/or heat recovery capacity, respectively, with the same structural volume, when compared to the previous equipment.
  • the object is also to provide a heat recovery tower with reduced gross expenditure, and which could be manufactured industrially in series production.
  • the invention relates to a heat recovery tower for recovering the heat energy generated in an industrial plant.
  • the heat recovery tower according to the invention comprises at least the following units, detachably connected to each other and arranged one on top of the other, seen from the bottom upwards
  • the heat recovery tower according to the invention comprises units that are freely stackable one on top of the other.
  • the overall dimensions and shapes of the units are preferably substantially identical enabling very easy stacking. Therefore, all the units in the heat recovery tower according to the invention are preferably substantially j joint so, that the floor area of the tower is the same as the square area of the bottom unit.
  • the heat recovery tower according to the invention can be used when, for example, renovating old factories, thereby increasing the heat recovery efficiency and/or heat recovery capacity, respectively, with the same structural volume, when compared to the previous equipment. Accordingly, it also provides a heat recovery tower with reduced gross expenditure, which can be manufactured industrially in series production.
  • the heat recovery tower according to the invention also has preferably such a small area of base, that several such towers can be located near the source of the air or gas, whereupon transfer pipes that are long, large in diameter, expensive and inconvenient in many ways, are avoided.
  • the heat recovery tower according to the invention it is also possible to attain short assembly time, whereupon, e.g. the new building projects of old factories have short downtime in this respect.
  • the aid of a heat recovery tower according to the invention it possible to simplify the making of the foundation, since such tower requires only a relatively small, although solid foundation due to the weight being distributed on a relatively small area. With the aid of a heat recovery tower according to the invention also transportation can be simplified.
  • the units are preferably designed so that they can be transported in normal trucks and containers.
  • the assembling in the factory can also be performed without so-called haulage i.e. the units can be lifted to the place of assembly, one on top of the other with a relatively big mobile crane, through a hole in the factory ceiling.
  • savings are made in the manufacturing stage in the factory by making e.g. a welding jig for the assembly of the outer casings of the units, provided that in their horizontal cross-sections, all the units in a same tower are identical in shape and size.
  • a person skilled in the art knows that, in order to obtain the required result, there can be a desired number of above-mentioned units.
  • defining the number of units is a routine calculation. As an example it can be mentioned, that there can be 1 to 5 of the said air/air-heat exchangers, and 1 to 5 of the said air/water-heat exchangers.
  • there can also be some other number of each of the washing units such as two, three, four, five or six, and their number can be freely selected independently.
  • a heat recovery tower according to the invention can be arranged so, that it extends at least from the factory floor to the ceiling.
  • one or more extension units that are empty, can be used in the tower.
  • the said extension units can also be used in other cases.
  • it is preferred that these extension units are available in different heights.
  • the units of the heat recovery tower according to the invention are identical in shape and size.
  • said unit has substantially the form of a rectangular prism, comprising a first, second, third and fourth outer surface, with the first and third outer surface being substantially of the same size and parallel, and the second and fourth being substantially of the same size and parallel, and where
  • the above-described guiding means facilitate the assembling of the units quickly and with planned accuracy. Opening this kind of structure is also easy, if such operation should sometimes be carried out. This kind of structure is also economical to manufacture.
  • the configuration of the horizontal cross-section of the heat recovery tower is at least nearly rectangular, units with different capacities can be created especially by selecting the longer side of the rectangular in high capacity units to be fairly large in comparison with the other side. If the shorter side is e.g. about 2.45m long, which still can fit in a marine container, the longer side can be less than 6m, whereupon it can fit in a 20ft marine container. Larger units fit in 30 or 40ft marine containers. If, additionally, the outer wall panels of the unit forming a layer have been connected to each other only with welded joints, bolt joints and their problems - problems with fitting the seal, with tightness and with appearance in case of leaking - can entirely be avoided. A welded joint is also strong and simple in comparison with the, double-flanged butt joints. In this way, also a fairly strong structure can be achieved by creating a continuous, closed circle. Sufficient dimensional accuracy of the structure can also be easily obtained
  • a seal such as a sealing strip
  • a tight and long lasting joint with no previously common disadvantages, such as using screws and nuts through the seal, can be obtained with such sealing structure. If between two units a seal is used that compresses only along a chosen distance when the upper unit is lowered on top of the lower unit, a sealing solution is obtained with ideal seal functioning. Due to the design and manufacturing, compressing takes place to a suitable extent, and no excess compressing can occur. In such cases there is no need for so-called sealing glue or additives, such as, e.g. silicone paste, the use of which has many known disadvantages.
  • At least one service platform at a distance from the factory floor can also be arranged in the heat recovery tower according to the invention. Service and repairs can thus be carried out safely and quickly from the service platform without any separate structures or e.g. elevating platform equipment.
  • At least one service platform of the heat recovery tower can be supported with the supports attached to the braces on the outer surface of the tower.
  • Such service platform structural solution is simple, and at the same time a strong and solid securing is obtained.
  • the service platform support can be secured with at least and preferably with only one bolt or similar, to the said brace, whereupon the assembly, and respectively, the detachment of the service platform can be carried out very quickly.
  • Adjustable bearer feet can be arranged to the bottom unit of the heat recovery tower, with which the heat recovery tower can be adjusted as well as possible to a desired position, usually in a horizontal position. In this way a bottom unit of the tower structure can be obtained, which is simple and quick to assemble and easy to arrange to a horizontal position in both directions with e.g. a spirit level. In that case, even the base can be at least somewhat uneven.
  • braces on the outer surfaces of the heat recovery tower, on which the guiding means of the upper unit are resting. In this way a structure can be obtained where the braces function not only as traditional reinforcing structural elements, but also as guiding means between the layers, greatly facilitating and speeding up the assembly.
  • the heat recovery tower according to the invention extends above the roof, through a hole at the ceiling of the room, the floor space can be used efficiently, since most of the units are located at the upper part of the room, which space is not usually used to its full potential. It is often important, that the discharge outlet is on the roof and thus outside, without any special arrangements.
  • mounting means known as such by a person skilled in the art, such as a hole and a screw and a nut fitting in the hole, or a rivet.
  • the first guiding means is a guiding surface and the second guiding means is a guiding spline.
  • a method for constructing a heat recovery tower for recovering the heat energy from the gas generated in an industrial plant consists of at least the following steps:
  • a heat recovery tower can be constructed which is modular in the respect that a desired number of units can be arranged one on top of the other in order to obtain the desired operation, efficiency and height for each operating situation.
  • the reference number 1 denotes a known heat recovery equipment with which energy is recovered from the air or from some other gas, which is processed in such equipment usually at least several cubic meters per second, and in large units usually tens of cubic meters per second.
  • the gas to be processed is brought through a large pipe indicated by an arrow 2, to a preprocessing equipment 3 in which there are usually filters, de-watering equipments and at least one heat exchanger, where a warm intermediate agent heats some intermediate agent flow, for example in order to heat the paper machine room during a cold season.
  • Reference number 4 denotes an electric motor operated fan blowing the gas out of the equipment.
  • a heat exchanger 5 recovers the heat and finally the gas is blown through a pipe up to the factory roof, the pipe extending high enough in the direction of an arrow 6.
  • the equipment has been built on steel pipe frames 7 and 8 standing on the floor. Also the fan 4 and large pipes 2 and 3 are supported on the floor. Thus, the floor has several points of base on a wide area, usually more than ten, for the heat recovery equipment 1. In some other known solutions, the fan is located on the factory roof to suck air through the equipment.
  • a heat recovery tower 9 according to an embodiment of the invention and shown in Figure 2 , has been arranged on the factory floor 10 and the tower 9 extends up to the factory ceiling 11. Usually the distance between the floor 10 and the ceiling 11 is 5 to 10 m, but it can be more, even over 12 m.
  • the heat recovery tower 9 has a rectangular horizontal cross-section and it has been constructed of module-type units made e.g. of steel plate, usually by welding stainless or acid-proof steel plates. There are units for different uses and of different sizes, to obtain the desired performance.
  • Towers can be for example 1,70 m, 2,05 m and 2,45 m wide, whereupon even the widest of them can be transported by the normal means of transport, for example by road transport or marine container.
  • Length of the modules can be standard, for example 4,20 m, whereupon no problems should rise during transportation, and 4,20 m is anyhow relatively large for several applications.
  • the height can also vary, usually between 0,50 to 1,50 m. If there is enough space for transportation, two, even three units can be transported one on top of the other. It is clear, that the capacity of the unit is at least almost directly proportional to the section's horizontal cross-sectional area - and also to the height. For clarity, no unit lines have been drawn in Figure 2 .
  • the heat recovery tower occupies a maximum of 2,45 m x 4,20 m of floor space, if keeping to the above-mentioned dimensions. Naturally, other dimensions can also be used if necessary.
  • FIG. 1 On the factory floor 11, there is also the fan 4 run by an electric motor 12 elevated on a stand 13. A seal collar 14 is used in the roof through hole.
  • Figure 2 also shows service platforms needed in the service and maintenance, and the connecting steps with railings. The units and their structures will be explained in more detail below.
  • FIG 3 shows an exploded view of the heat recovery tower 9 and the exhaust air fan 4 of Figure 2 , showing the layout of the units in the tower and partly, the layout of the equipment by the tower, which are the exhaust air fan 4 with its electric motor 12 and stand 13.
  • the lowermost unit of the heat recovery tower 9 is a bottom basin 17, located on the factory floor 10 on the feet 18, arranged preferably and substantially horizontally. It should be noted, that the mass of the heat recovery tower 9 is usually tens of tons.
  • a reactive attenuator can be used as a spacer unit between the bottom basin 17 and the fan 4.
  • Reference numbers 19a and 19b denote so-called CHR-cells i.e. air/air-heat exchangers.
  • the next unit is a so-called washing unit 20 followed usually by two of so-called AHR-cells 21 a, 21b, i.e. air/water -heat exchangers. Also their number may vary within the range of 1 to 3, even though even more can be chosen, if required.
  • the next unit upwards in the tower 9 is preferably a washing unit 22, above which empty extension units 23a, 23b are arranged, with which the factory room ceiling 11 is reached. Above the roof a seal collar 14 is used. On top of this, can next be arranged a sound attenuator 24, above which there still is a reducer cone 15 and a pipe 16, through which the processed gas gets freely out to the atmosphere.
  • the effect/tower of these cells is typically for the CHR-cells usually 300 to 2000 kW, preferably 400 to 1500 kW, more preferably 500 to 1000 kW, and for the AHR-cells, usually 300 to 15000 kW, preferably 1000 to 10000 kW, more preferably 2000 to 5000 kW. These effects can usually be reached with one or more cells.
  • FIG. 4 shows as a perspective view the elements arranged on the factory floor, which are the fan 4, the electric motor 12 on the stand 13, and the bottom basin 17 with its feet 18.
  • a reactive attenuator 25 has been located between the fan 4 and the bottom basin 17, the object of which is to muffle the noise generated by the fan.
  • the reactive attenuator 25 has a damping chamber, separated with a perforated plate from the flow port in the middle.
  • a rather short reactive attenuator 25 is used, for example a device of about 0,7 m long in the direction of flow.
  • Figure 5a shows as a perspective cut view a connecting structure between the units according to an embodiment of the invention, before the top unit 27 is lowered to its place.
  • Reference number 26 denotes the lower unit with the wall plate bent outward horizontally by a distance, for example 5 cm, forming a sealing surface, and from there upwards by a distance, for example also 5 cm, forming a mounting surface.
  • the lower part of the upper unit 27 is first bent outwards almost horizontally, for example less than 5 cm, forming a sealing surface, and from there upwards, for example 4 cm, forming a mounting surface.
  • Bottom part of the upper unit has guiding splines 38, functioning as guiding means during the assembly of the upper and lower blocks.
  • the guiding spline 38 rests on the guiding surfaces of the side shoring profile 33.
  • the upper unit and the lower unit are already connected to each other, that is they are in place.
  • the weight of the upper unit ensures that the seal 28 is pressed so, that the seal 28 is pressed to become about 20 to 35% thinner than the original thickness, whereupon the seal 28 functions as a sealing means in a proper way. Further pressing is prevented with a structural solution so, that the ends of the side shoring profiles 33 meet when the pressure of the seal 28 is suitable.
  • the said seal remains well in place during assembly, because during assembly the upper unit is lowered on top of the lower unit and the seal is not subjected to any lateral load.
  • Figure 6 shows the corner structure and seals 28 of the upper part of the lower unit 26.
  • the salient corner of the unit has a vertical welded corner shoring profile 32.
  • the corners of the seal 28 have been cut to an angle of 45 degrees and they are cured together to an angle of 90 degrees.
  • the seal be taped in place with, for example, a two-sided tape during manufacturing, whereupon the seal is in place and secured both during transportation and assembly, since the flange prevents the seal from damaging.
  • the flange forms also a rather stiff structure, whereby the flange has a clearly stiffening effect on the unit.
  • FIG. 7 shows a so-called AHR-unit i.e. the air/water-heat exchanger 21a during the changing of cells.
  • the unit- 21 a has the corner shoring profiles 32 according to the invention on the outer surface of all four corners, and also all sides have vertical side shoring profiles 33.
  • Energy is recovered from the heat energy contained in the gas flowing upwards in the AHR-unit by heating the water, that is circulated in the heat exchange plate of the heat exchanger.
  • the AHR-unit has at its end a bypass manifold 34 for introducing the water to the heat exchanger plates, of which one plate 35 has been taken out for replacement through a service opening 36b at the end of the AHIZ-unit.
  • the number of plates is usually several dozens in a single AHR-unit.
  • FIG. 7 shows also the guiding splines 38, provided at the end of each corner shoring profile 32 and side shoring profile 33. In Figure 7 , they are located at the bottom, but they can also be installed on the top.
  • the object of the guiding splines 38 is to help during assembly, since when the spline 38 meets the corresponding hole of the shoring profile of the lower unit, the upper unit will be nicely guided in its place and also the seal areas fall correctly in their place. Since the unit is several meters long, supporting bars 39 are used for keeping the sidewalls at the right distance from each other. Also crossing support means, such as draft bars (not shown) can be used when required, in order to keep the rectangular horizontal cross-section.
  • Figure 8 shows the fixing of the service platform support to the side shoring profile 33.
  • the side shoring profiles 33 are preferably strong enough to bear the stresses caused by the service platforms and service men.
  • the service platform support 40 is made, for example of steel plate by cutting and bending and thus of only one piece.
  • An upper boom 41 can by definition be of a desired length, for example 0,7 m to bear a sufficiently wide service platform.
  • the upper boom 41 is, from its vertical parts, for example bolted with nuts through a hole 42 to the side shoring profile 33 and a lower boom 43 rests on the same side shoring profile 33, somewhat, for example 0,3 m, lower.
  • the lower boom 43 is slanting upwards away from the unit so that at the outer end of the support 40 the vertical distance between the lower boom 43 and upper boom 41 is about 0,15 m.
  • the upper boom 41 preferably has a hole 44 for fixing the railing post.
  • the presented railing structure is very easy to manufacture and erect as well as solid and strong. It is also very quick to dismantle if so required.
  • the service platform itself can be made of grille plate or the like, known as such.
  • the heat recovery tower 9 operates in such a way that the fan 4 moves the gas through the pipes to the recovery process and in the process.
  • the fan 4 noise is reduced by using an attenuator 25.
  • all the desired units have been assembled one on top of the other, including for example heat exchangers, washers, water collecting plates, entrainment separators, and, if required, extension pieces.
  • a sound attenuator and a reducer cone with its pipe to open air can optionally be arranged on top of the tower.
  • the heat recovery tower can also consist of at least one separation equipment for separating water from the moist air or steam led through the heat recovery tower.
  • the amount of passing air is usually 35 to 50 m 3 /s and the exhaust air mass flow rate is usually 20 to 40 kg/s of dry air.
  • the mass of the tower is typically 15 to 50 tons.
  • the solution according to the invention can thus save in the gross expenditure of a factory project and in the manufacturing, transporting and assembly costs of the tower, typically 20 to 50% compared with the prior art.
  • the heat recovery tower 9 is constructed of standard components, whose testing has already been carried out in the factory.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Gas Separation By Absorption (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Heat-Pump Type And Storage Water Heaters (AREA)
  • Separation By Low-Temperature Treatments (AREA)
EP03732604A 2002-07-05 2003-06-18 Heat recovery tower Expired - Lifetime EP1552234B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FI20021332 2002-07-05
FI20021332A FI118826B (fi) 2002-07-05 2002-07-05 Lämmöntalteenottotorni
PCT/FI2003/000491 WO2004005823A1 (en) 2002-07-05 2003-06-18 Heat recovery tower, method for constructing same and unit for use therein

Publications (2)

Publication Number Publication Date
EP1552234A1 EP1552234A1 (en) 2005-07-13
EP1552234B1 true EP1552234B1 (en) 2008-09-10

Family

ID=8564314

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03732604A Expired - Lifetime EP1552234B1 (en) 2002-07-05 2003-06-18 Heat recovery tower

Country Status (7)

Country Link
EP (1) EP1552234B1 (fi)
AT (1) ATE408111T1 (fi)
AU (1) AU2003239628A1 (fi)
DE (1) DE60323523D1 (fi)
FI (1) FI118826B (fi)
NO (1) NO20050634L (fi)
WO (1) WO2004005823A1 (fi)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3321419B1 (en) * 2016-11-09 2021-01-13 RWE Generation NL B.V. Multi stage washing column and device for drying wetted material comprising a multi stage washing column
FI130948B1 (fi) 2022-04-06 2024-06-12 Valmet Tech Oy Modulaarinen lämmöntalteenottotorni

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1253765A (fr) * 1960-04-11 1961-02-10 Separator Ab Tour frigorifique
US3132190A (en) * 1961-10-12 1964-05-05 Baltimore Aircoil Co Inc Heat exchange apparatus
GB1220885A (en) * 1968-02-16 1971-01-27 Baltimore Aircoil Co Inc Wet deck for evaporative cooler
US3870773A (en) * 1972-05-22 1975-03-11 Ecodyne Corp Cooling tower
US4774033A (en) * 1987-03-17 1988-09-27 Energair Research And Development Gas liquid tower structure
WO1993010891A1 (en) * 1991-11-27 1993-06-10 Curtis Harold D Modular cooling tower
GB0018565D0 (en) * 2000-07-29 2000-09-13 Lickes John M Apparatus for cooling a liquid
GB0123824D0 (en) * 2001-10-04 2001-11-28 Isherwood Paul A Modular cooling tower

Also Published As

Publication number Publication date
FI118826B (fi) 2008-03-31
AU2003239628A1 (en) 2004-01-23
DE60323523D1 (de) 2008-10-23
NO20050634L (no) 2005-02-28
ATE408111T1 (de) 2008-09-15
EP1552234A1 (en) 2005-07-13
WO2004005823A1 (en) 2004-01-15
FI20021332A0 (fi) 2002-07-05
FI20021332A (fi) 2004-01-06

Similar Documents

Publication Publication Date Title
US9841238B2 (en) Direct forced draft fluid cooling tower
US7275734B2 (en) Tower/frame structure and components for same
US4422983A (en) Fiberglass reinforced cooling tower
AU713329B2 (en) Rigid cooling tower
EP2235300B1 (en) Air guide for air cooled condenser
WO1995002097A1 (en) Prefabricated building systems
US20230152040A1 (en) Hybrid wet/dry cooling tower and improved fill material for cooling tower
WO2018044396A1 (en) Modular compression plant
CN108661178A (zh) 一种组合式集装箱房屋
EP1552234B1 (en) Heat recovery tower
US4976895A (en) Lightweight cooling tower with fan supported by a vertical liquid supply pipe
CN1721155A (zh) 板式墙体构件的移动式生产工艺
US20200056377A1 (en) Panel wall structure for use in a tower/frame structure and cooling tower
US10648747B2 (en) Modular cooling tower with screwless FRP exterior
CN114768887B (zh) 一种催化法烟气脱硫装置催化剂洗涤再生方法
CN211651127U (zh) 一种组合式固危废处置设备
KR20240093909A (ko) 응축 플랜트
CN115045542A (zh) 一种快速建造模块化中小型体育馆及安装方法
EP0616551A1 (en) Modular cooling tower
CN112761216A (zh) 可移动房屋及泵站
KR200246125Y1 (ko) 열교환모듈 및 이를 이용한 열교환장치
AU700025B2 (en) Prefabricated building systems
AU5590301A (en) Prefabricated building systems

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20041228

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL LT LV MK

DAX Request for extension of the european patent (deleted)
RBV Designated contracting states (corrected)

Designated state(s): AT DE FI FR GB SE

17Q First examination report despatched

Effective date: 20071128

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

RTI1 Title (correction)

Free format text: HEAT RECOVERY TOWER

RIC1 Information provided on ipc code assigned before grant

Ipc: F28C 1/02 20060101AFI20080417BHEP

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT DE FI FR GB SE

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

REF Corresponds to:

Ref document number: 60323523

Country of ref document: DE

Date of ref document: 20081023

Kind code of ref document: P

REG Reference to a national code

Ref country code: SE

Ref legal event code: TRGR

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed

Effective date: 20090611

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20120622

Year of fee payment: 10

Ref country code: FR

Payment date: 20120705

Year of fee payment: 10

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20130618

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20140228

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20130618

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20130701

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 20220620

Year of fee payment: 20

Ref country code: DE

Payment date: 20220620

Year of fee payment: 20

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FI

Payment date: 20220621

Year of fee payment: 20

Ref country code: AT

Payment date: 20220621

Year of fee payment: 20

REG Reference to a national code

Ref country code: DE

Ref legal event code: R071

Ref document number: 60323523

Country of ref document: DE

REG Reference to a national code

Ref country code: SE

Ref legal event code: EUG

REG Reference to a national code

Ref country code: AT

Ref legal event code: MK07

Ref document number: 408111

Country of ref document: AT

Kind code of ref document: T

Effective date: 20230618