Classifications

• • 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
  • F24H3/00—Air heaters
  • F24H3/02—Air heaters with forced circulation
  • F24H3/06—Air heaters with forced circulation the air being kept separate from the heating medium, e.g. using forced circulation of air over radiators
  • F24H3/08—Air heaters with forced circulation the air being kept separate from the heating medium, e.g. using forced circulation of air over radiators by tubes
  • F24H3/087—Air heaters with forced circulation the air being kept separate from the heating medium, e.g. using forced circulation of air over radiators by tubes using fluid fuel
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F26—DRYING
  • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
  • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
  • F26B21/001—Drying-air generating units, e.g. movable, independent of drying enclosure
  • F26B21/002—Drying-air generating units, e.g. movable, independent of drying enclosure heating the drying air indirectly, i.e. using a heat exchanger
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F28—HEAT EXCHANGE IN GENERAL
  • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
  • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
  • F28D7/0066—Multi-circuit heat-exchangers, e.g. integrating different heat exchange sections in the same unit or heat-exchangers for more than two fluids
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F28—HEAT EXCHANGE IN GENERAL
  • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
  • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
  • F28D7/0066—Multi-circuit heat-exchangers, e.g. integrating different heat exchange sections in the same unit or heat-exchangers for more than two fluids
  • F28D7/0083—Multi-circuit heat-exchangers, e.g. integrating different heat exchange sections in the same unit or heat-exchangers for more than two fluids with units having particular arrangement relative to a supplementary heat exchange medium, e.g. with interleaved units or with adjacent units arranged in common flow of supplementary heat exchange medium

Definitions

• the invention relates to a textile machine with forced-air heating by means of gas-heated heat exchangers with flame tubes, in particular meander tubes, arranged in parallel in a suction space transversely to its air space, and a burner connected upstream. Flame tubes should preferably be flowed through in an anti-parallel manner.
• the textile machine preferably has a device for indirectly heating the treatment gas, in the housing of which a cross-countercurrent recuperator designed by the invention is arranged.
• the convection heating is provided in convection drying and / or fixing machines for the thermal treatment of a textile fabric.
• convection drying and / or fixing machines for the thermal treatment of a textile fabric.
• Such machines are stenter frames and hot flues (see the relevant keywords in Koch, Satlow, cones Textil-Lexikon, Deutsche Verlags-Anstalt Stuttgart, 1996).
• DE 100 47 834 A1 describes a textile machine with a device for indirect heating of the treatment gas, which contains a cross-countercurrent recuperator arranged in a housing.
• the latter is constructed in such a way that the sum of the temperature values, which are measured on a straight line in the direction of the circulating air flow at the flame tube parts hit by the line, are everywhere in (perpendicular to the circulating air flow) Cross section of the heat exchanger is the same.
• the energy transferred in the heat exchanger is applied by a burner.
• combustion gases intended for heating are mixed directly with the circulating air, and this is then referred to as direct heating.
• the combustion gases generally generated by burning gas or oil then come into direct contact with the textile fabric. If this is to be avoided, the aforementioned indirect heating can be used.
• Indirect heating generally uses heat exchangers with oil circulation or steam heating. These heat exchangers ensure that the circulating air flow to be heated, its volume and also its cross-section - determined by the consumption in the nozzle system to be supplied - is relatively large and receives the same temperature everywhere in the flow cross-section. The latter is a prerequisite for the fact that the flow of air, e.g. in the nozzle boxes, the flow of treatment agent formed has the same temperature everywhere on the treated surface of the textile fabric.
• this advantage is bought at a high price if the user lacks heating systems for operating heat exchangers heated by oil circulation or steam, i.e. considerable additional investments are required even if occasional applications with indirect heating only occur.
• the two partial flows are mixed with one another in different suction and pressure rooms with the aid of complex circulating air mixers, so that in any case a uniform temperature distribution over the width of the material web is achieved when it hits the material.
• the separate temperature control is necessary because it is hardly possible to control both burners absolutely the same from one controller. This is due to the tolerance and hysteresis of the control valves for the energy supply, eg gas supply.
• each of the two burners should contain its own temperature control circuit with its own temperature sensor and control valve (for energy supply).
• the solution according to the invention for the textile machine described at the outset is that two burners, each with a downstream tube heat exchanger, are assigned one half - right and left half - of the suction chamber and that the flame tubes of both heat exchangers in the main part of the suction chamber crosswise to its airflow the entire width of the suction chamber is sufficient, but in at least one section of the circulating air flow path in the suction chamber only extends over the suction chamber half assigned to the respective burner.
• the burners are each assigned to a part of the suction space with a downstream tube heat exchanger , wherein the heating tubes of both heat exchangers in the main part of the suction chamber extend transversely to its air flow over the entire width of the suction chamber, but in at least one section of the air flow path in the suction chamber only extend over the suction chamber part assigned to the respective burner.
• the tubes of the two heat exchanger parts are arranged in such a way that in the main part of the heat exchanger a tube layer of the first heat exchanger alternates with one of the second heat exchanger.
• the combustion gases flow within the flame tubes while the circulating air to be conveyed to the textile fabric and heated is led around the tubes.
• the heat exchange takes place on the surface of the pipes, where the heat of the combustion air is released into the circulating air.
• the flame tubes of the two heat exchangers are guided in their main part, preferably in a meandering shape, over the entire width of the suction space.
• the flame tubes in which the combustion gases of the one, for example the right burner, flow, are only through the right half of the suction chamber, while the flame tubes of the other, i.e. left, burner are only in the left half of the suction chamber.
• the left or right half is spoken for simplicity. Basically, it is part of the suction space.
• the combustion gases are passed to a collector and sucked out of the machine from there.
• the partial division of the heat exchanger according to the invention can preferably be provided at the beginning and / or at the end of the air circulation path in the suction space.
• the divided section of the heat exchanger can, however, basically be located at any point on the heat exchanger, e.g. also somewhere in the middle of the air route.
• the invention provides a heat exchanger supplied by two burners for indirect convection heating, which enables precise, separate control of the two burners, but can be produced with considerably less effort than if each burner had to be assigned a separate heat exchanger as a whole.
• the largely undivided heat exchanger according to the invention is, for example, less expensive to manufacture than two separate heat exchangers, since - in the undivided area of the heat exchanger, only half of the welding work (as with complete division) has to be carried out.
• a cross-countercurrent recuperator according to the invention for indirectly heating a treatment gas had four over the whole Wide flame tube loops extending transversely to the circulating air flow, which are supplied by each of the burners, and for each of the burners an additional flame tube loop extending over half of the circulating air cross section.
• a heat exchanger duct 2 cut parallel to the circulating air flow 1 is shown in principle.
• the heat exchanger duct 2 has an inlet 3 and an outlet 4 and opposing longitudinal walls 5 and 6.
• the duct 2 comprises a right half 7 and a left half 8.
• the halves 7 and 8 are each assigned a burner 9 and 10.
• Two flame tubes 11 and 13 are supplied by each burner.
• the flame tubes are preferably guided through the heat exchanger channel 2 in meanders 15, 16 running antiparallel to one another.
• the meandering tubes 11 and 13 shown run transverse to the circulating air flow 1 and meandering in the direction of the circulating air flow 1.
• the flame tubes 11 as well as the flame tubes 13 are guided back and forth across the heat exchanger channel 2, that is to say from the longitudinal wall 5 to the longitudinal wall 6.
• the flame tubes 11 meander only in the right half 7 and the flame tubes 13 only in the left half 8 of the heat exchanger channel 2.
• a temperature sensor 20, 21 is assigned to each, which controls the associated burner 9 or 10 via a controller 22 or 23 (along the line of action shown) in such a way that the circulating air flow 1 emerging at the outlet 4 extends over the entire circulating air flow cross section, from the longitudinal wall 5 to Longitudinal wall 6 (and across it), the same temperature everywhere.
• the combustion gases can be passed to a collector via heating outlets 24, 25 and extracted from there from the machine.
• the following example shows how the temperature control according to the invention can work: It is assumed that the combustion gases of the right burner 9 are hotter by 20 ° Celsius than the combustion gases of the left burner 10 (800 ° Celsius compared to 780 ° Celsius).

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Thermal Sciences (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Treatment Of Fiber Materials (AREA)
• Drying Of Solid Materials (AREA)
• Control Of Combustion (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

ID=30469079

Family Applications (1)

Country Status (7)

Families Citing this family (13)

Family Cites Families (12)

• 2002
  • 2002-07-25 DE DE10233754A patent/DE10233754B4/de not_active Expired - Fee Related
• 2003
  • 2003-07-11 AU AU2003254626A patent/AU2003254626A1/en not_active Abandoned
  • 2003-07-11 EP EP03787311A patent/EP1525424A1/de not_active Withdrawn
  • 2003-07-11 CN CNA038011379A patent/CN1564927A/zh active Pending
  • 2003-07-11 WO PCT/DE2003/002326 patent/WO2004017004A1/de not_active Application Discontinuation
  • 2003-07-11 BR BR0305666-0A patent/BR0305666A/pt not_active Application Discontinuation
  • 2003-07-11 US US10/490,353 patent/US20050000113A1/en not_active Abandoned

Non-Patent Citations (1)

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