WO2009059739A2

WO2009059739A2 - Heat treatment device

Info

Publication number: WO2009059739A2
Application number: PCT/EP2008/009285
Authority: WO
Inventors: Stephan Wild
Original assignee: Linde Aktiengesellschaft
Priority date: 2007-11-06
Filing date: 2008-11-04
Publication date: 2009-05-14
Also published as: ZA201003728B; ES2372944B1; ES2372944A1; WO2009059739A3; DE102007052827A1

Abstract

The invention relates to a heat treatment device and to a method for the installation thereof, said heat treatment device having a heating section, secondary and auxiliary units and a supporting framework to which the heating section and at least some of the secondary and/or auxiliary units are fastened and/or can be fastened. The heating section comprises at least one self-supporting module which can be fitted as a whole into the supporting framework and can be connected to the supporting framework in such a manner that, in the fitted state, the module is preferably completely supported on the supporting framework.

Description

Wärmebehandlungseiπrichtung

The invention relates to a heat treatment device, comprising a waste heat line, auxiliary and auxiliary units and a supporting structure, to which both the waste heat line and at least a part of the auxiliary and / or auxiliary units are attached and / or fastened.

Furthermore, the invention relates to a method for assembling such a heat treatment device.

A heat recovery route is understood to mean a device through which hot gases pass and which is designed with internals via which a part which can transfer heat contained in the hot gases to another medium can be transferred. An example of a heat recovery path is an exhaust passage located downstream of a gas turbine equipped with a heat exchanger through which a portion of the heat from the turbine exhaust gases passing through the exhaust passage can be transferred to water or water vapor to produce steam. Another example is the convection zone of a process furnace in which a portion of the heat of hot combustion gases conducted through the convection zone is transferable to a feed to be heated which is ductable in pipes through the convection zones.

Auxiliary units are devices that are required for the proper functioning of the heat recovery route. Examples of this are flue gas fans and control cabinets.

Auxiliaries are to be understood as devices with the aid of which material streams which emerge into or out of the waste heat route are treated in the waste heat route. Examples of these are steam drums and quench coolers.

In production plants of the chemical and petrochemical industry heat treatment devices are often used in which feedstocks are treated by heat. Well known from the prior art For example, so-called cracking furnaces are widely used in industry in which olefin-rich fission gases are produced from long-chain hydrocarbons (for example naphtha or gas oil). However, such cracking furnaces could also be used for the thermal cleavage of other starting materials. The feedstocks are - if necessary after dilution with steam - passed in pipes through a process furnace consisting of two different waste heat stretches. In the first heat removal line, the so-called convection zone, in which the heat of hot flue gases is transferred predominantly convectively to the pipes, the feedstocks are warmed up before they reach the so-called radiation zone heated by burners. Here, where the heat transfer from the hot flue gases to the tubes takes place predominantly by radiation, the starting materials are split. The generated gap gas stream is then led out of the process furnace and passed for rapid cooling in Quenchkühler.

The process furnace of a cracking furnace has an outside, reinforced with steel girder outer shell, which is provided on its inside with a heat-insulating lining. The steel girders form a supporting structure, which on the one hand stabilizes the process furnace and on the other hand serves for the attachment of auxiliary and / or ancillary equipment, such as, for example, the quench cooler or the flue gas blower.

According to the state of the art, the convection zone of a cracking furnace is constructed from convection zone modules which are already provided with longitudinal conduits (convection zone bundles) and which have on their outsides steel beams which, when installed, form part of the structure. By this type of construction, the convection zone modules are sturdy enough to be stacked and interconnected. Since the structure forms part of the process furnace, and is built at the same time with this, can be started with the assembly of the auxiliary and auxiliary equipment only after the completion of the process furnace. If there are delays in the construction of the process furnace, because, for example, a convection zone module is delivered late, the completion of the cracking furnace is delayed accordingly.

The reason for the frequently delayed delivery of the convection zone modules are the complicated convection zone bundles to be manufactured. An alternative Spaltofenkonstruktion therefore provides the possibility of the outer jacket of the Convection zone - including the heat-insulating lining - to build without Konvektionszonenbündel and install them only later on the open end of the convection zone. Since in this procedure the structure can already be completed before the convection zone bundles are installed, delays in the delivery of the bundles do not necessarily lead to delays in the completion of the cracking furnace. The tubes of a convection zone bundle usually end in a transversely arranged to the tubes collector, which connects the tubes together and which is arranged in the installed state outside the convection zone. To ensure optimum heat transfer from the hot flue gases to the tubes, the outer tubes of a convection zone bundle run at a very small distance from the heat-insulating lining. Since the collector, for structural reasons, projects beyond the tube bundle, it is not possible to expand a convection zone bundle as a whole into or out of the convection zone. Rather, it is necessary, the collector or parts of the collector only after the introduction of the

Assemble the tube bundle or to remove prior to removal. This work is very time-consuming and expensive and has a high potential for error, since they may have to be carried out in unfavorable weather conditions outdoors. In addition, they are associated with significant accident risks, as they are carried out at high altitudes. Beyond that, the closing or opening of the end face of the convection zone is problematic since the necessary pipe penetrations considerably complicate this work.

The present invention is therefore based on the object to provide a heat treatment device of the type described above and a method for their assembly, by which the disadvantages of the prior art are overcome.

On the device side, the stated object is achieved in that the heat recovery line comprises at least one self-supporting module (module) that can be inserted as a whole in the structure and connected to the structure such that the module preferably fully supported in the installed state of the structure.

If the heat recovery path of a heat treatment device according to the invention comprises more than one module, a preferred variant of the invention provides that each of the Module can be inserted as a whole in the structure and connected to the structure such that the module is almost completely supported in the installed state of the structure. This variant allows an arrangement of the modules both vertically above one another and horizontally next to each other.

On the other hand, another preferred variant of the invention provides that the waste heat line consists of more than one module, the modules being stackable perpendicular to one another and the weight forces resulting from the modules being able to be introduced into the supporting structure solely via the lowest of the modules (foundation module). A module arranged above the foundation module can preferably be connected to the supporting structure via a movable bearing construction, so that forces acting horizontally on the module are introduced as completely as possible directly into the supporting structure without any load being placed on other modules, in particular the foundation module.

A module according to the invention represents a part of the waste heat line, which can be manufactured outside the installation site of the heat treatment device and is transported as a whole into its installation position. A module is designed as a self-supporting construction, i. H. it is so stiff that it does not deform plastically under the forces that occur during transport and during assembly, but also during any subsequent disassembly. Preferably, a module is designed as a rectangular steel construction, which is provided on its inside with a heat-insulating lining (thermal insulation). The heat insulation corresponds expediently already in the nature and strength of the thermal insulation, which must have the waste heat line at the installation position of the module to ensure proper operation of the heat treatment device.

A module has openings through which hot gases can flow into or out of the module during operation of the heat treatment device. According to a particularly preferred embodiment, a module comprises internals, such as a heat exchanger, through which a medium can be guided and heatable in the installed state and / or a device for changing the chemical composition of the gases flowing through the module (eg denitrification devices for removal of nitrogen oxides from flue gases). The Fixtures are arranged so that they can be flowed through by the hot gases or.

A heat treatment device according to the invention preferably has substantially the same space requirements as a comparable (feedstock, throughput, heating power), but designed according to the prior art heat treatment device. This means that the structures of the two heat treatment devices have substantially the same dimensions. The same applies to the internal dimensions of the heat recovery line and the thickness of the thermal insulation. The steel construction of a module must therefore necessarily be designed with a small footprint. For a module to achieve the required stability, the steel outer walls are preferably designed as a surface structure. If due to the limited space, the attachment of a supporting element (eg a T-beam) on an outside of a module is not possible, so sees an expedient

Embodiment of the invention, the supporting element to be mounted so that it protrudes at least with a part of its cross section into the interior of the module and thus in the thermal insulation. Such arranged supporting elements are exposed during operation of a higher thermal load, as more outwardly disposed elements, which is why in the design of a module, particular attention is paid to their strength proofs. Optionally, such a supporting element is made of a material which is thermally higher loadable, the material of which the elements of the module are exposed, which are exposed to lower thermal loads during operation.

An expedient embodiment of the device according to the invention provides a device (adjusting device), via which a module is supported on the supporting structure, and with the aid of which the installation position of the module in the vertical direction is adjustable. Appropriately, the adjusting device is designed so that it can also be used to fix the installation position of the module on the structure.

In an expedient embodiment, the heat treatment device according to the invention comprises at least one horizontally arranged, straight roadway which is connected or connectable to the supporting structure and which can be used to insert a module into the supporting structure. A preferred variant of the invention provides that the roadway is designed as Katzbahnträger, which is fastened or fastened at a location above the installation position of a module on the structure. At least during the assembly or disassembly time of a module is supported on the Katzbahnträger at least one traversing from, which includes a trolley and standing in operative connection with this lifting device. With the help of the shuttle, a load connectable with it can be positioned in two spatial directions, since the trolley is designed such that it can be moved along the trolley track in both directions, while the lifting device allows the load to be lifted and lowered. In conjunction with the traversing device, the trolley lane thus allows a module (load) to be inserted into the structure and positioned in its installed position within the structure or to lift the module from its installation position and then drive it out of the structure.

Another preferred variant of the invention provides that the roadway is formed from rails which are fastened or fastened at the height of a module to be introduced on the daytime work. Appropriately, on the rails suitable traversing device, such as rolling, can be arranged, to which a module for mounting or dismounting using a suitable lifting device deducted and by means of which the module along the rails in both directions can be moved. Provided that there is sufficient distance between a module and an installation part arranged above the module in order to be able to place the module on the travel device, such a roadway permits the assembly or disassembly of a module independently of the installation parts arranged above the module. For example, a plurality of modules arranged one above the other can be mounted in any order with the aid of the described system.

Furthermore, the invention relates to a method for mounting a heat treatment device, comprising a waste heat line, auxiliary and auxiliary units and a supporting structure to which both the waste heat line and at least a portion of the auxiliary and / or auxiliary units are attached and / or fastened. The stated object is procedurally achieved according to the invention that at least a portion of the waste heat line is mounted after the creation of the structure, but preferably after the creation of the structure and the attachment of auxiliary and / or auxiliary equipment to the structure, this part of the heat recovery distance at least consists of a component designed as a self-supporting module (module), which is inserted as a whole in the structure and connected to it so that the module is preferably completely supported in the installed state of the structure.

For a person skilled in the art, a further description of the method according to the invention also provides a method for dismantling a heat treatment device. For this purpose, the process steps described for the assembly are essentially carried out in reverse order.

In the event that a heat recovery path comprises more than one module, provides a preferred variant of the method according to the invention that each module is inserted as a whole in the structure and connected to it so that the module is preferably fully supported in the installed state of the structure ,

Another preferred variant of the method according to the invention provides that a module (foundation module) is inserted into the supporting structure and connected to it before the other modules are stacked vertically on the foundation module, wherein the weight forces resulting from the modules alone on the foundation module in the structure will be initiated. Modules stacked on the foundation module are connected to the structure via a non-locating bearing structure, so that forces acting horizontally on the module are introduced as completely as possible directly into the structure without any load being placed on other modules, in particular the foundation module.

Further developing the method according to the invention, it is proposed that

Mounting a module is used a positioning system that includes a connected or connectable to the structure roadway.

An expedient variant of the method according to the invention provides for the use of a first type of positioning system, one above the installation position of the Module on the supporting structure mounted Katzbahnträger and on the Katzbahnträger supporting, with a lifting device in operative connection trolley comprises. The module to be mounted is transported, for example, on a truck to the site of the heat treatment device and positioned in a straight line to the later installation position before it is struck on the lifting device, lifted and moved along the cat track with the help of the trolley. For reasons of space and cost, however, a trolley track will usually be designed in such a way that it towers only insignificantly beyond the truss structure. In this case, the invention provides that for mounting the module, a not belonging to the heat treatment device, suitably formed by one or more truck cranes external lifting device is used. The module positioned in a straight line to the installation position is first raised to above its installation position by means of the external lifting device and then struck with its end facing the heat treatment device against the lifting device of the positioning system. Subsequently, the module will be placed along the

Katzbahnträgers retracted so far into the structure until it floats vertically above its installation position. The module is now also struck with its second end on the lifting device of the positioning system and released from the external lifting device before it is lowered into its installed position and connected directly or indirectly (via a foundation module) to the supporting structure.

A further expedient variant of the method according to the invention provides for the use of a second type of positioning system, the rails mounted at the height of the installation position of the module, a traveling device arranged on the rails, such as rolling carriages, and suitable ones

Lifting device with which the module can be lifted from the traversing device or set down on the traversing device. The invention also provides, in this case, for the assembly of the module to use an external lifting device not belonging to the heat treatment device and expediently formed by one or more cranes. The module positioned in a straight line to the installation position is first struck on the external lifting device and raised to the height of its installation position. Then we placed the module with his his the heat treatment device end facing the traversing device and retracted with their help in the structure. Once the focus of the mode in the field of Rails is located, the connection to the external lifting device can be solved and the module along the rails far into the structure to be moved until it is vertically above its mounting position. Subsequently, the module is lifted by means of the lifting device of the traversing device and, after removal of the traversing device, drained into its installation position, in which it is firmly connected directly or indirectly to the supporting structure.

The invention is suitable for the construction of any heat treatment device. With particular advantage, however, it can be used for the construction of cracking furnaces, as they are widely used for example in petrochemical plants.

Claims

claims

1. A heat treatment device, comprising a waste heat line, auxiliary and auxiliary units and a supporting structure to which both the waste heat line and at least a part of the auxiliary and / or auxiliary units are attached and / or fastened, characterized in that the waste heat line at least one self-supporting Module (module) comprises, which can be inserted as a whole in the structure and connected to the structure such that the module preferably fully supported in the installed state of the structure.

2. Heat treatment device according to claim 1, characterized in that the waste heat line comprises more than one module, each module can be inserted as a whole in the structure and connected to the structure such that the module is preferably fully supported in the installed state of the structure.

3. Heat treatment device according to claim 1, characterized in that the heat recovery line comprises more than one insertable as a whole in the structure module, wherein the modules are stacked vertically one above the other and from the

Modules resulting weight forces alone on the bottom of the modules (foundation module) are introduced into the structure.

4. Heat treatment device according to one of claims 1 to 3, characterized in that a module is designed as a rectangular steel construction, on the inside of a heat-insulating lining is attached.

5. Heat treatment device according to one of claims 1 to 4, characterized in that a module has openings which allow a flow through the module with hot gases in the installed state.

6. Heat treatment device according to one of claims 1 to 5, characterized in that a module comprises at least one Wäπmtauscher through which a medium lead in the installed state and is thereby heatable.

7. Heat treatment device according to one of claims 1 to 6, characterized in that a module has at least one Entstickungseinrichtung in which are removed in the installed state nitrogen oxides from the feasible through the module hot gases.

8. Heat treatment device according to one of claims 1 to 7, characterized in that it comprises at least one connected to the structure or connectable and usable for mounting a module roadway.

9. Heat treatment device according to claim 8, characterized in that the roadway designed as Katzbahnträger and above the installation of the

Module is attached to the structure or fastened.

10. Heat treatment device according to claim 8, characterized in that the roadway consists of rails on which the module is movable by means of rolling, wherein the rails are fastened or fastened at the height of the installation position of a module on the supporting structure.

11. A method for assembling a heat treatment device, comprising a waste heat line, auxiliary and auxiliary units and a supporting structure to which both the waste heat line and at least a portion of the auxiliary and / or auxiliary units are attached and / or fastened, characterized in that at least a part of the heat recovery route only after the creation of the

Supporting structure, but preferably after the creation of the structure and the attachment of auxiliary and / or auxiliary equipment is mounted on the structure, said part of the heat removal line consists at least of a self-supporting module (module) running component, which is inserted as a whole in the structure and connected to this in such a way that the module preferably fully supported in the installed state on the structure.

12. The method according to claim 11, characterized in that the Abhitzestrecke is constructed from more than one module, each module is inserted as a whole in the structure and connected to it in such a way that the module preferably fully supported in the installed state of the structure.

13. The method according to claim 11, characterized in that the waste heat line is constructed from more than one module, one of which (foundation module) is inserted into the structure and connected to this, before the other modules are stacked vertically on the foundation module one above the other, wherein the weight forces resulting from the modules alone over the

Foundation module are introduced into the structure.

14. The method according to any one of claims 11 to 13, characterized in that a module is inserted by means of a, connected to the supporting structure or connectable carriageway traversing system in the structure.

15. The method according to claim 14, characterized in that a module is lifted by means of a lifting device, which is not part of the heat treatment device, on the positioning system and then transported by means of the Verfahrsystems to its installation location.