EP4368933A1 - Dispositif de régulation pour réguler la température d'un gaz de processus et échangeur de chaleur doté d'un dispositif de régulation - Google Patents

Dispositif de régulation pour réguler la température d'un gaz de processus et échangeur de chaleur doté d'un dispositif de régulation Download PDF

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Publication number
EP4368933A1
EP4368933A1 EP22206671.4A EP22206671A EP4368933A1 EP 4368933 A1 EP4368933 A1 EP 4368933A1 EP 22206671 A EP22206671 A EP 22206671A EP 4368933 A1 EP4368933 A1 EP 4368933A1
Authority
EP
European Patent Office
Prior art keywords
piston
process gas
inner housing
inlet opening
control device
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.)
Pending
Application number
EP22206671.4A
Other languages
German (de)
English (en)
Inventor
Antonio COSCIA
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.)
Air Liquide SA
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
Original Assignee
Air Liquide SA
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
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 Air Liquide SA, LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude filed Critical Air Liquide SA
Priority to EP22206671.4A priority Critical patent/EP4368933A1/fr
Priority to JP2023177892A priority patent/JP2024070228A/ja
Priority to CN202311350180.1A priority patent/CN118009788A/zh
Priority to AU2023251487A priority patent/AU2023251487A1/en
Priority to CA3217195A priority patent/CA3217195A1/fr
Priority to US18/387,670 priority patent/US20240159483A1/en
Publication of EP4368933A1 publication Critical patent/EP4368933A1/fr
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
    • F28F27/02—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus for controlling the distribution of heat-exchange media between different channels
    • 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
    • F28D7/16—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 the conduits being arranged in parallel spaced relation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/02—Header boxes; End plates
    • F28F9/0202—Header boxes having their inner space divided by partitions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2250/00—Arrangements for modifying the flow of the heat exchange media, e.g. flow guiding means; Particular flow patterns
    • F28F2250/06—Derivation channels, e.g. bypass

Definitions

  • the invention relates to a control device for controlling the temperature of a process gas, in particular for controlling the temperature of a process gas in a heat exchanger.
  • the invention further relates to a heat exchanger which comprises a control device according to the invention.
  • Heat exchangers for cooling hot process gases are well known in the art.
  • Such heat exchangers are often designed as tube bundle heat exchangers, which comprise a bundle of indirectly cooled heat exchanger tubes that carry process gas and a bypass tube that is often arranged in the middle and also carries process gas.
  • the hot process gas is cooled by a cooling medium that is guided in a jacket space of the heat exchanger.
  • the process gas guided in the bypass tube is not cooled or is only cooled insignificantly because the bypass tube has a much larger diameter than the heat exchanger tubes.
  • the bypass tube can also be guided outside the jacket of the heat exchanger, so that the portion of the process gas that flows through the bypass tube is not cooled at all.
  • the cooling medium used usually water, is converted into steam and can be used elsewhere as heating steam or process steam.
  • Heat exchangers of this type are often also referred to as waste heat boilers.
  • the temperature of the process gas at the outlet of the heat exchanger is controlled by the amount of process gas that passes through the heat exchanger tubes or the bypass tube.
  • the sole control is the flow rate through the bypass tube, with corresponding control devices arranged within the bypass tube being considered as temperature control devices.
  • the heat exchanger comprises at least two tube bundles, each of which is provided with a dedicated gas flow control device, wherein the flow distribution and the flow rate between the different tube bundles are controlled in order to control the temperature of the process gas at the heat exchanger outlet.
  • the main cooling surface is defined by the heat exchanger tubes of the heat exchanger, which are indirectly cooled by the cooling medium.
  • the maximum opening rate of the bypass pipe should be mechanically limited for the most unfavorable critical design case.
  • This design case is typically defined by the fact that the system in question is operated at full load and, in particular, the heat exchanger pipes have a maximum degree of contamination on the inside. The heat transfer to the process gas is therefore significantly worse than with uncontaminated heat exchanger pipes and the temperature of the cooled process gas is correspondingly higher.
  • a temperature control device which, in the event of a fault, closes with spring support, for example, and thus reduces the flow through the bypass pipe to zero, is not desirable, since uncontrolled closing of the bypass can reduce the outlet temperature of the process gas (a mixture of uncooled and cooled process gas) below a defined minimum temperature, which is required for the safe operation of downstream system components.
  • EP1 498 678 discloses a heat exchanger with a bypass pipe which is tightly connected to a guide pipe, wherein a piston designed as a closure member is arranged in the guide pipe so as to be axially displaceable.
  • the piston is double-walled, and cooling channels through which a coolant flows are arranged in the double wall of the piston.
  • EN 10 2012 007 721 A1 discloses a process gas cooler with lever-controlled process gas cooler flaps.
  • a flap shaft is provided which is connected to a drive body by means of levers and connecting rods in such a way that the gas passage speed and quantity of the process gas through the process gas cooler flaps can be controlled from the outside with the aid of the drive body.
  • EP 3 159 646 A1 discloses a heat exchanger with a control device which comprises a throttle valve connected to a drive for setting a gas outlet temperature of the heat exchanger to a specific temperature range.
  • An outlet speed and an outlet quantity of the uncooled exhaust gas flow from the bypass pipe can be controlled by a throttle valve arranged at the outlet end of a bypass pipe and adjustable by means of the drive of the control device, wherein the throttle valve is made of a material resistant to high-temperature corrosion in a temperature range sensitive to high-temperature corrosion.
  • An object of the present invention is to at least partially overcome the disadvantages of the prior art.
  • an object of the present invention is to provide a control device for controlling the temperature of a process gas, which enables the largest possible control range with respect to the process gas temperature to be set.
  • control device for controlling the temperature of a process gas, which comprises the control of the entire temperature range from maximally cooled process gas to uncooled process gas.
  • Another object of the present invention is to provide a control device for controlling the temperature of a process gas, which minimizes the occurrence of leakage flows with respect to the process gas flow.
  • a further object of the present invention is to provide a control device for controlling the temperature of a process gas, which, in the event of a technical failure of the control device, does not lead to a state in which a maximum permissible outlet temperature of the process gas can be exceeded.
  • a further object of the present invention is to provide a heat exchanger with a control device for controlling the temperature of a process gas, which at least partially solves at least one of the aforementioned objects.
  • the control device has an inner housing which extends from an inflow space of the control device through a mechanical separating element into an outflow space, and a piston designed as a hollow body which is arranged within the inner housing and can be moved in the axial direction within the inner housing.
  • the inner housing has openings through which hot process gas can flow into the inner housing via the first housing inlet opening and cooled process gas can flow into the inner housing via the second housing inlet opening.
  • the inner housing also has at least one further opening, here a housing outlet opening, through which temperature-controlled process gas can flow out of the interior of the inner housing into the outflow space.
  • the piston which is designed as a hollow body and through which flow can pass, has corresponding openings.
  • Hot process gas can flow into the piston interior via a first piston inlet opening, in particular after it has passed through the first housing inlet opening of the inner housing, via the first piston inlet opening.
  • Cooled process gas can flow into the piston interior via the second piston inlet opening, in particular after it has passed through the second housing inlet opening of the inner housing.
  • the hot process gas and the cooled process gas are mixed in the piston interior.
  • the temperature-controlled process gas is available through this mixture. This can then first pass through the piston outlet opening, can thereby flow into the interior of the inner housing, and can then pass through the housing outlet opening of the inner housing in particular.
  • the temperature-controlled process gas can then flow out into the outflow chamber, since the inner housing extends through the mechanical separating element into the outflow chamber and the housing outlet opening is arranged in such a way that temperature-controlled process gas can flow out of the interior of the inner housing into the outflow chamber.
  • the temperature-controlled process gas can then flow out of the control device via the outlet nozzle.
  • the inner housing comprises a first housing inlet opening, which is arranged such that hot process gas can flow into the interior of the inner housing, in particular from the at least one hot gas line into the interior of the inner housing.
  • the inner housing comprises a second housing inlet opening, which is arranged such that cooled process gas can flow into the interior of the inner housing, in particular from the inflow space into the interior of the inner housing.
  • the interior of the inner housing is fluidically connected to at least one hot gas line for conducting hot process gas, in particular fluidically connected to the at least one hot gas line via the first housing inlet opening.
  • the interior of the inner housing is fluidically connected to the inflow space, in particular fluidically connected to the inflow space via the second housing inlet opening.
  • the interior of the inner housing is fluidically connected to the outflow space, in particular fluidically connected to the outflow space via the housing outlet opening.
  • the piston comprises a first piston inlet opening, which is arranged such that hot process gas can flow into the piston interior, in particular from the interior of the inner housing into the piston interior.
  • the piston comprises a second piston inlet opening, which is arranged such that cooled process gas can flow into the piston interior, in particular from the inflow space into the piston interior.
  • the piston comprises a piston outlet opening which is arranged such that temperature-controlled process gas can flow out of the piston interior, in particular from the piston interior into the interior of the inner housing.
  • the housing outlet opening of the inner housing is arranged adjacent to the outflow space.
  • the first housing inlet opening of the inner housing is arranged adjacent to the hot gas line.
  • the second housing inlet opening of the inner housing is arranged adjacent to the inflow space.
  • the piston can be moved in the axial direction within the inner housing. This means that the freely flowable cross-sectional area defined by the second piston inlet opening can be changed. This is the case because the second housing inlet opening and the second piston inlet opening are arranged in such a way that the freely flowable cross-sectional area of the second piston inlet opening can be increased or decreased by axially moving the piston within the interior of the inner housing, or in extreme cases can be closed.
  • the wall of the inner housing and the second housing inlet opening arranged within the wall of the inner housing make it possible to vary, i.e. change, the freely flowable cross-sectional area of the second piston inlet opening by moving the piston in the axial direction. Accordingly, depending on the degree of opening of the second piston inlet opening and the freely flowable cross-sectional area defined thereby, a lot or little, or no cooled process gas flows into the piston interior. This achieves appropriate temperature control of the process gas.
  • the outside of the jacket-side wall of the piston is in surface contact with the inside of the jacket-side wall of the inner housing.
  • Appropriate seals can be provided to minimize leakage currents between the piston and the inner housing.
  • the design of the control device with a piston and the defined openings offers the advantage that leakage currents can be largely or completely avoided, which is not the case with devices based on flap systems, for example.
  • the piston is displaceable in the axial direction via an actuator.
  • the piston is displaceable along its physical or imaginary longitudinal axis.
  • the first housing inlet opening is arranged in the region of a front wall of the inner housing, in particular a first front wall of the inner housing.
  • the second housing inlet opening is arranged in the region of a shell-side wall of the inner housing.
  • the housing outlet opening is arranged in the region of a further front wall of the inner housing, in particular in the region of a second front wall of the inner housing.
  • the first front wall of the inner housing adjoins the hot gas line.
  • the second front wall of the inner housing adjoins the outflow chamber.
  • the shell-side wall of the inner housing adjoins the inflow chamber and the outflow chamber.
  • the first piston inlet opening is arranged in the region of a front wall of the piston, in particular a first front wall of the piston.
  • the second piston inlet opening is arranged in the region of a jacket-side wall of the piston.
  • the piston outlet opening is arranged in the region of a front wall of the piston, in particular in the region of a second front wall of the piston.
  • a “shell-side wall” is understood to mean, regardless of the geometric design of the piston or the inner housing, a wall which runs around the piston and/or the inner housing parallel or substantially parallel to a physical or imaginary longitudinal axis of the piston and/or the inner housing.
  • a “front wall” is understood to mean a wall, regardless of the geometric design of the piston or the inner housing, which is arranged perpendicular or substantially perpendicular to a physical or imaginary longitudinal axis of the piston and/or the inner housing.
  • the inner housing and the piston each have two end walls (a first and a second end wall), and the respective shell-side wall extends between these two end walls.
  • the hot process gas emerging from the at least one hot gas line and flowing into the piston interior via the first housing inlet opening and the first piston inlet opening can also be referred to as uncooled process gas or essentially uncooled process gas.
  • the (at least one) hot gas line can also be referred to as a bypass line. This means that the hot gas line in question is not cooled or is only insignificantly cooled, i.e. its cooling is bypassed. This can be due to the fact that the hot process gas in the hot gas line is not cooled by indirect cooling with the aid of a cooling medium, or the hot gas line has such a large diameter that no cooling or only insignificant cooling occurs through indirect cooling via a cooling medium flowing around the hot gas line.
  • the interior of the inner housing is fluidically connected to the at least one hot gas line.
  • the interior of the inner housing can be connected to the hot gas line directly or, for example, via one or more transition pieces.
  • the control device can also comprise several hot gas lines, for which the same configuration applies. This means that the interior of the inner housing is then fluidically connected to this plurality of hot gas lines, so that the total amount of hot process gas from these hot gas lines can flow into the interior of the inner housing.
  • the inflow space is fluidically connected to at least one cold gas line, but usually to a plurality of cold gas lines.
  • the cold gas line or the plurality of cold gas lines form/form the main cooling surface of the device for providing the cooled process gas.
  • the cold gas line or the plurality of cold gas lines is/are in particular surrounded by a cooling medium which cools the process gas and thus provides cooled process gas.
  • the cold gas line(s) accordingly carry the cooled process gas.
  • temperature-controlled process gas refers in particular to the process gas which can be generated by mixing the hot process gas and the cooled process gas in the piston interior and which, after flowing out of the piston interior into the interior of the inner housing and then flowing out into the outflow space, can be discharged from the device via the outlet nozzle, i.e. can flow out.
  • the "temperature-controlled process gas" for this extreme case can also be a process gas which has the same or substantially the same temperature as the hot process gas.
  • the device according to the invention also advantageously allows the first piston inlet opening to be completely closed, the control device being configured such that the first piston inlet opening is simultaneously open, according to one embodiment, is completely open.
  • the "temperature-controlled process gas” can be a process gas that has the same or essentially the same temperature as the cooled process gas.
  • An embodiment of the control device is characterized in that the first housing inlet opening of the inner housing is arranged within a first front wall of the inner housing, and the first piston inlet opening is arranged within a first front wall of the piston, wherein said openings are arranged relative to one another in such a way that the first housing inlet opening of the inner housing and the first piston inlet opening cannot be flowed through by the hot process gas when there is surface contact between said front walls.
  • the control device to be operated in such a way that no hot process gas passes through the inner housing in the direction of the outflow chamber.
  • the second piston inlet opening is simultaneously fully open.
  • the first housing inlet opening and the first piston inlet opening can be arranged offset from one another in such a way that the hot process gas cannot flow through these openings when there is surface contact between the said front walls.
  • these openings are arranged in such a way that they do not overlap when there is surface contact between the said front walls, so that no flow through these openings is possible.
  • the second piston inlet opening can be completely closed so that only hot process gas passes through the device.
  • the aforementioned embodiment can therefore realize the other extreme case, namely that only hot process gas passes through the device.
  • the control device thus makes it possible to control the temperature of the process gas over the entire temperature range of the two process gas types, cooled and hot process gas.
  • the second housing inlet opening and the second piston inlet opening are therefore arranged in such a way, in particular the second housing inlet opening in the region of the jacket-side wall of the inner housing and the second piston inlet opening in the region of the jacket-side wall of the piston, that when the first front wall of the inner housing and the first front wall of the piston are in surface contact, the freely flowable cross-sectional area of the second piston inlet opening corresponds to the maximum opening area of the second piston inlet opening.
  • a preferred embodiment of the control device is characterized in that the first housing inlet opening of the inner housing and/or the first piston inlet opening are/is designed as an annular gap.
  • a preferred embodiment of the control device is characterized in that the first front wall of the piston has a sealing element mechanically connected to this front wall.
  • An embodiment of the control device is characterized in that the piston is mechanically connected to the actuator via a shaft.
  • the mechanical stop element is firmly connected to the shaft, i.e. connected to the shaft in such a way that the position of the stop element cannot be changed during operation of the control device.
  • the stop element is connected to the shaft in a force-locking manner, for example via a screw connection or a clamp connection.
  • the stop element can be arranged in the interior of the inner housing and outside the piston. According to this embodiment, the stop element can, according to one example, strike against a wall of the inner housing during a corresponding stroke of the piston, in particular strike against the inside of the second end wall of the inner housing.
  • the stop element can be arranged inside the outflow chamber and outside the inner housing. According to this embodiment, the stop element can strike against a wall of the outer housing, in particular strike against an inner side of a wall of the outer housing, in accordance with one example, when the piston is stroked accordingly.
  • the stop element is arranged in such a way that a complete closure of the opening, which defines the freely flowable cross-sectional area of the second piston inlet opening, can be prevented or is prevented.
  • the stop element is mechanically connected firmly to the shaft at a defined position, whereby the positioning of the stop element does not allow the second piston inlet opening to be closed, which would mean that cooled process gas from the inflow space would no longer be able to flow through it.
  • the stop element prevents the connection between the inflow chamber and the piston interior from closing completely, meaning that only hot process gas from the hot gas line would flow through the control device. This prevents temperatures from becoming too high in the area of the outlet of the control device, particularly in the area of the outlet nozzle. Temperatures that are too high at the outlet of the device can damage devices located downstream of the control device.
  • a preferred embodiment of the control device is characterized in that the mechanical stop element can be changed in its position along the shaft in the axial direction, in particular its position can be changed depending on the prevailing operating conditions.
  • the mechanical stop element is not connected to the shaft by a material connection, such as a welded connection. Rather, the stop element is connected to the shaft by a detachable connection, for example by a force-fit connection, so that the position of the stop element can be changed, for example during maintenance work on a relevant system.
  • the process gas in question is cooled less, which makes it advantageous to increase the volume flow of the cooled process gas accordingly.
  • Increasing the volume flow through the cold gas lines improves the heat transfer from gas to water (coolant). This compensates for the insulating effect of a layer of dirt that primarily forms on the outside of the cold gas lines, i.e. on the coolant side. Similar considerations must be made with regard to the hot gas line(s) that carry the uncooled process gas.
  • a preferred embodiment of the control device is therefore characterized in that the mechanical stop element can be changed in its position along the shaft in the axial direction depending on the temperature of the cooled process gas and/or the temperature of the uncooled process gas.
  • a preferred embodiment of the control device is advantageously characterized in that the mechanical stop element can be changed in its position along the shaft in the axial direction depending on the degree of contamination of the at least one cold gas line and/or the degree of contamination of the at least one hot gas line.
  • a preferred embodiment of the control device is characterized in that the piston can be rotated in the radial direction via an actuator, so that the freely flowable cross-sectional area of the second piston inlet opening can be changed by rotating the piston in the radial direction.
  • a further degree of freedom is introduced, which relates to the variability of the freely flowable cross-sectional area defined by the second piston inlet opening.
  • a preferred embodiment of the control device is characterized in that the piston is displaceable in the axial direction via a first actuator and the piston is rotatable in the radial direction via a second actuator.
  • a preferred embodiment of the control device is characterized in that the piston has the shape of a straight hollow cylinder.
  • the piston has the shape of a straight hollow cylinder, or the shape of a substantially straight hollow cylinder, or substantially the shape of a straight hollow cylinder.
  • the piston is preferably shaped as a straight hollow cylinder. This geometry enables complete closure of the opening(s) to at least one hot gas line while simultaneously ensuring low leakage rates with respect to the space between the piston and the inside of the inner housing.
  • the piston has the shape of a hollow truncated cone, with the diameter of the truncated cone decreasing along the flow direction of the gases flowing through the piston interior.
  • At least one of the aforementioned objects is further at least partially achieved by a heat exchanger having a control device according to one of the aforementioned embodiments, wherein the heat exchanger has a plurality of cold gas lines arranged parallel to one another and configured as a tube bundle, which are fluidically connected to the inflow space, and wherein the heat exchanger has a centrally arranged hot gas line which has a larger diameter than the cold gas lines.
  • the heat exchanger comprises the control device according to the invention, or the control device forms part of the heat exchanger.
  • the heat exchanger is preferably a tube bundle heat exchanger.
  • the heat exchanger has a centrally arranged hot gas line, but according to one embodiment can also comprise several centrally arranged hot gas lines.
  • the hot gas line or hot gas lines and the cold gas lines can be arranged coaxially.
  • the hot gas line can also be referred to as a bypass line. This means that the cooling of the process gas in the hot gas line is either completely or essentially completely bypassed.
  • a preferred embodiment of the heat exchanger is characterized in that the cold gas lines each have an inlet end and an outlet end, and the hot gas line has an inlet end and an outlet end, wherein the outlet ends of the cold gas lines merge into the inflow space and the outlet end of the hot gas line merges into the inner housing, and wherein the inlet ends of the cold gas lines and the inlet end of the hot gas line merge into a process gas inflow space, wherein the process gas inflow space has a process gas inlet nozzle.
  • Hot process gas can flow into both the hot gas line and the cold gas lines via the process gas inflow chamber. Part of the hot process gas is then cooled in the cold gas lines, part flows through the hot gas line and is not cooled or is essentially not cooled.
  • At least one of the aforementioned objects is further at least partially achieved by the use of the control device according to one of the aforementioned embodiments of the control device or according to one of the aforementioned embodiments of the heat exchanger for cooling synthesis gas from a steam reformer or an autothermal reformer.
  • Figure 1 shows a simplified representation of a lateral cross-sectional view of the control device according to the invention with the first piston inlet opening closed and the second piston inlet opening completely open.
  • the control device 1 has an outer housing 10, which comprises an inflow space 11 and an outflow space 14.
  • the inflow space 11 and the outflow space 14 are spatially separated from one another by a mechanical separating element 17.
  • An inner housing 18 is arranged within the outer housing 10, which extends within the inflow space 11, through the mechanical separating element 17, and within the outflow space 14.
  • the inner housing is fluidically connected to a hot gas line 20, the inflow space 11, and the outflow space 14 via several openings 22, 23, and 24 (opening 24 not shown).
  • the inner housing 18 has an interior space 19.
  • the openings 22, 23 and 24 are located within the wall of the inner housing and thus establish fluidic connections between the interior 19 of the inner housing 18 and the hot gas line 20, the inflow space 11 and the outflow space 14.
  • the control device 1 also has a plurality of cold gas lines 13 which are fluidically connected to the inflow space. While cooled process gas 12 flows through the cold gas lines 13, hot process gas 21 flows through the hot gas line 20. Due to the large diameter of the hot gas line 20 compared to the small diameter of the cold gas lines 13, the hot process gas 21 in the hot gas line 20 is only insignificantly cooled.
  • the outlet ends of the cold gas lines 13 (not shown) and the outlet end of the hot gas line 20 (not shown) are fixed within the holes (not shown) of a perforated plate 37 which extends over the cross-sectional area of the outer housing.
  • a cooling medium flows around the cold gas lines 13 and the hot gas line 20, thereby cooling the process gas flowing in the cold gas lines 13.
  • the control device 1 can also be understood as part of a tube bundle heat exchanger with a centrally arranged bypass pipe, here the hot gas line 20.
  • a heat exchanger has a corresponding inlet connection and an outlet connection for the cooling medium.
  • the connections are not shown in the figures.
  • the cooling medium is in particular cooling water, which is discharged from the heat exchanger as steam by cooling the hot process gas and can then be used as heating steam or process steam.
  • the hot gas line 20 extends through the perforated plate 37 into the inflow space 11 and is thereby mechanically firmly connected to the inner housing 18.
  • the part of the hot gas line 20 which extends through the inflow space 14 can also be understood not as part of the hot gas line 20, but as a connecting piece or transition piece between the hot gas line 20 and the inner housing 18.
  • the inner housing 18 has a first front wall 31 in which a first housing inlet opening 22 designed as an annular gap is arranged.
  • the hot process gas 21 can flow into the interior 19 of the inner housing 18 through the first housing inlet opening 22 when the opening 22 is open and thus flowable.
  • the inner housing 18 also has a housing outlet opening 24 (opening not shown) which is arranged within a second front wall 32 of the inner housing.
  • a temperature-controlled process gas 15 can flow out of the interior 19 of the inner housing 18 into the outflow chamber 14 via the housing outlet opening 24.
  • the temperature-controlled process gas 15 can then be discharged from the control device 1 via an outlet nozzle 16 from the outflow chamber 14.
  • the inner housing 18 also has a second housing inlet opening 23, which is arranged within the shell-side wall 38 of the inner housing. As shown in the figure, several such openings 23 can be present.
  • a piston 25 is arranged in the interior 19 of the inner housing 18, which is designed as a cylindrical hollow body and is connected to an actuator 27a and a further actuator 27b via a shaft 35.
  • the piston 25 has a piston interior 26.
  • the shaft is mechanically firmly connected to the piston, i.e. the piston 25 and the shaft 35 form a mechanical unit which can be moved via the actuators 27a and 27b.
  • the piston 25 can be moved in the axial direction, i.e. along its longitudinal axis, which is partially formed by the shaft 35. This type of movement is indicated by the arrow on both sides of the actuator 27a.
  • the piston 25, designed as a hollow body, has a plurality of openings 28, 29 and 30 through which flow can pass through the piston.
  • a first piston inlet opening 28 is arranged within a first front wall 33 of the piston 25.
  • Hot process gas 21 can flow into the piston interior 26 through the first piston inlet opening 28 after passing through the first housing inlet opening 22 when the piston 25 is in the appropriate position.
  • a second piston inlet opening 29 is arranged within a jacket-side wall 39 of the piston. As shown in the figure, a plurality of such openings 29 can be present. Cooled process gas 12 can flow into the piston interior 25 through the second piston inlet opening 29 after passing through the second housing inlet opening 23 when the piston 25 is in the appropriate position.
  • the freely flowable cross-sectional area of the second piston inlet opening can be changed.
  • the second housing inlet opening 23 and the second piston inlet opening 29 are arranged in relation to one another in such a way that the size of the second piston inlet opening and thus the amount of the freely flowable cross-sectional area of this opening can be changed.
  • the piston 25 is in a position in which the second piston inlet opening 29 is opened as wide as possible, i.e. the entire opening or the entire cross-sectional area of this opening is available for the cooled process gas 12 to flow through.
  • the second housing inlet opening 23 and the second piston inlet opening 29 are congruently positioned one above the other.
  • the flow-through areas defined by the second housing inlet opening 23 and the second piston inlet opening 29 do not have to be the same size, but can also be different sizes. The only important thing is that both openings are arranged in relation to each other in such a way that the freely flow-through cross-sectional area of the second piston inlet opening 29 can be changed.
  • the piston 25 is also in a position in which access to the hot gas line 20 is closed.
  • Figure 2 shows a side cross-sectional view of a control device according to the invention with the first piston inlet opening open and the second piston inlet opening completely closed.
  • control device 1 is shown with a position of the piston 25 in which access to the second piston inlet opening 29 is completely closed. At the same time, access to the hot gas line 20 is completely open, which enables a maximum flow of hot process gas 21.
  • the flow of cooled process gas 12 is thus zero, or limited to negligible leakage flows. If the piston 25 is continuously moved to the left via the actuator 27a, the freely flowable cross-sectional area of the second piston inlet opening 29 is continuously increased and the flow of cooled process gas 12 is therefore also continuously increased.
  • the pressure drop between the inflow space 11 and the outflow space 14 also changes, which also changes the amount of hot process gas 21 that can flow into the piston 25, i.e. the flow of hot process gas 21 is continuously reduced.
  • the hot process gas 21 and the cooled process gas 12 are mixed in the piston interior, resulting in the temperature-controlled process gas 15. This flows into the outflow chamber via the piston outlet opening 30 and the housing outlet opening 24.
  • the term "temperature-controlled process gas” 15 is also used when access to the hot gas line 20 or to the inflow chamber 11 is closed depending on the position of the piston 25.
  • the control device 1 also has a second actuator 27b, by means of which the piston can be moved in the radial direction, i.e. rotated about its longitudinal axis.
  • This second actuator 27b thus represents a further degree of freedom with regard to the variability of the freely flowable cross-sectional area of the second piston inlet opening 29. If the second piston inlet opening is, for example, a circular opening, this opening 29 can be closed or at least further reduced by the radial movement even if the openings 23 and 29 are located one above the other.
  • the radial movement of the piston 25 via the shaft 35 by means of the second actuator 27b is indicated by the semicircular arrow.
  • Figure 3 shows a side cross-sectional view of a control device according to the invention with a mechanical stop element, with the first piston inlet opening open and the second piston inlet opening partially open.
  • Figure 3 shows an example of a control device 2 with an integrated mechanical stop element 36.
  • the stop element 36 is arranged within the inner housing 18, i.e. in the interior 19 of the inner housing 18, and is firmly connected to the shaft 35.
  • This fixed connection can be realized, for example, by a force-locking connection such as a screw connection.
  • the decisive factor is that the connection is a detachable connection.
  • the stop element 36 is therefore preferably not connected to the shaft 35 via a material-locking connection such as a welded connection.
  • a detachable connection enables the position of the stop element 36 to be changed depending on certain prevailing operating parameters, such as the degree of contamination of the hot gas line 20 and the cold gas lines 13.
  • the stop element 36 ensures that the shaft 35 together with the piston 25 cannot be moved so far that the second piston inlet opening 29 is closed, even in the event of a technical failure of the control device 2, in particular of the actuator 27a. This prevents only hot process gas 21 from leaving the control device 2 via the outlet nozzle 16. This may be desirable depending on the respective system, since process gases that are too hot can damage system components arranged downstream. If it is nevertheless desirable to completely close the second piston inlet opening 29 in such a case, this is possible via the second actuator 27b.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Details Of Heat-Exchange And Heat-Transfer (AREA)
EP22206671.4A 2022-11-10 2022-11-10 Dispositif de régulation pour réguler la température d'un gaz de processus et échangeur de chaleur doté d'un dispositif de régulation Pending EP4368933A1 (fr)

Priority Applications (6)

Application Number Priority Date Filing Date Title
EP22206671.4A EP4368933A1 (fr) 2022-11-10 2022-11-10 Dispositif de régulation pour réguler la température d'un gaz de processus et échangeur de chaleur doté d'un dispositif de régulation
JP2023177892A JP2024070228A (ja) 2022-11-10 2023-10-13 プロセスガスの温度を制御するための制御装置、及び制御装置を有する熱交換器
CN202311350180.1A CN118009788A (zh) 2022-11-10 2023-10-17 用于控制工艺气体的温度的控制装置以及具有控制装置的热交换器
AU2023251487A AU2023251487A1 (en) 2022-11-10 2023-10-19 Control device for controlling the temperature of a process gas and heat exchanger having a control device
CA3217195A CA3217195A1 (fr) 2022-11-10 2023-10-19 Dispositif de commande pour controler la temperature d~un gaz de procede et echangeur de chaleur comprenant un dispositif de commande
US18/387,670 US20240159483A1 (en) 2022-11-10 2023-11-07 Control device for controlling the temperature of a process gas and heat exchanger having a control device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP22206671.4A EP4368933A1 (fr) 2022-11-10 2022-11-10 Dispositif de régulation pour réguler la température d'un gaz de processus et échangeur de chaleur doté d'un dispositif de régulation

Publications (1)

Publication Number Publication Date
EP4368933A1 true EP4368933A1 (fr) 2024-05-15

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Application Number Title Priority Date Filing Date
EP22206671.4A Pending EP4368933A1 (fr) 2022-11-10 2022-11-10 Dispositif de régulation pour réguler la température d'un gaz de processus et échangeur de chaleur doté d'un dispositif de régulation

Country Status (6)

Country Link
US (1) US20240159483A1 (fr)
EP (1) EP4368933A1 (fr)
JP (1) JP2024070228A (fr)
CN (1) CN118009788A (fr)
AU (1) AU2023251487A1 (fr)
CA (1) CA3217195A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2846455B1 (de) * 1978-10-23 1979-10-31 Borsig Gmbh Rohrbuendel-Waermetauscher mit gleichbleibender Austrittstemperatur eines der beiden Medien
EP0356648A1 (fr) * 1988-08-18 1990-03-07 Deutsche Babcock- Borsig Aktiengesellschaft Echangeur de chaleur
EP0617230B1 (fr) 1993-03-26 1998-01-07 Haldor Topsoe A/S Méthode pour faire fonctionner une chaudière de récupération
EP1498678A1 (fr) 2003-07-12 2005-01-19 Borsig GmbH Echangeur de chaleur avec un tuyau bypass
DE102012007721A1 (de) 2012-04-19 2013-10-24 Thyssenkrupp Uhde Gmbh Hebelgesteuerte Prozessgaskühlerklappen
EP3159646A1 (fr) 2015-10-20 2017-04-26 Borsig GmbH Échangeur de chaleur
EP3407001A1 (fr) * 2017-05-26 2018-11-28 ALFA LAVAL OLMI S.p.A. Équipement à faisceau tubulaire muni d'une dérivation

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2846455B1 (de) * 1978-10-23 1979-10-31 Borsig Gmbh Rohrbuendel-Waermetauscher mit gleichbleibender Austrittstemperatur eines der beiden Medien
EP0356648A1 (fr) * 1988-08-18 1990-03-07 Deutsche Babcock- Borsig Aktiengesellschaft Echangeur de chaleur
EP0617230B1 (fr) 1993-03-26 1998-01-07 Haldor Topsoe A/S Méthode pour faire fonctionner une chaudière de récupération
EP1498678A1 (fr) 2003-07-12 2005-01-19 Borsig GmbH Echangeur de chaleur avec un tuyau bypass
DE102012007721A1 (de) 2012-04-19 2013-10-24 Thyssenkrupp Uhde Gmbh Hebelgesteuerte Prozessgaskühlerklappen
EP3159646A1 (fr) 2015-10-20 2017-04-26 Borsig GmbH Échangeur de chaleur
EP3407001A1 (fr) * 2017-05-26 2018-11-28 ALFA LAVAL OLMI S.p.A. Équipement à faisceau tubulaire muni d'une dérivation

Also Published As

Publication number Publication date
CA3217195A1 (fr) 2024-05-10
AU2023251487A1 (en) 2024-05-30
US20240159483A1 (en) 2024-05-16
JP2024070228A (ja) 2024-05-22
CN118009788A (zh) 2024-05-10

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