JP2009008384A - Process of assembling gas separation plant - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a process of assembling a gas separation plant, capable of minimizing material cost and construction cost of a casing with easy assembling. <P>SOLUTION: This process of assembling the gas separation plant is composed of a separation column 1 and the casing. The separation column 1 is manufactured in advance in a manufacturing factory, Pipe bridging modules 2a-2d for fixing an ancillary part are installed on an outer peripheral surface of the separation column. The separation column 1 is horizontally placed at a construction site, and the ancillary part is installed in the pipe bridging modules 2a-2d. At least a part of the whole height of the casing is constructed in advance from a lower part in a vertically turning attitude at the construction site during that time, and a casing upper part is left as it is in an opening state. The separation column 1 attached with the ancillary part is suspended in the vertically turning attitude. After being lowered and arranged in the casing, a residual part of the casing is constructed, and the casing upper part is closed. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method for assembling a gas separation facility including a separation column and a casing surrounding the separation column, and in particular, the separation column includes a pipe, a fluid inlet and a outlet along a longitudinal main axis, The present invention relates to a method for assembling a gas separation facility of a type in which an accessory part including at least one of valves and devices is mounted.

  For example, when constructing a gas separation facility such as a low-temperature air separation facility, there are basically two options for assembling the facility. The facility is manufactured in advance at the production plant as perfectly as possible and then transferred to the construction site. Or the assembly work of the components of the equipment is performed exclusively at the construction site. In the first option, considering the large dimensions of the separation column, such complete equipment is problematic with regard to transportation costs. In the second option, there is a problem that assembly of a considerable amount of work is inevitably performed in an environment that is not necessarily suitable for the work conditions. This assembly operation also includes an important step in which the separation column is installed inside a casing which becomes a cold box for insulation, for example.

Patent Document 1 describes, as an example of the prior art, a method of introducing an unfinished separation column in a manufacturing factory into a horizontally opened upper casing by an elevator. The separation column is completed in the casing in a horizontal state, the casing is closed, and the completed composite is transported to the construction site. In contrast to this method, Patent Document 1 itself manufactures a separation column and a casing separately in advance in a horizontal state at a production factory, and draws the manufactured separation column horizontally into the casing so that the entire equipment is integrated. It proposes a method of transporting to a construction site after a simple package.
European Patent No. 913653

Patent Document 2 describes that a separation column is mounted inside a casing placed in a horizontal state with one open side facing up. This Patent Document 2 describes that a separation column manufactured in advance is transported to a construction site, and discloses that the separation column is moved by a lift into a horizontally disposed casing with the upper surface open during the transportation. Only. Also, the assembly of the separation column and casing in this case is a form that can be operated from above, and this means that, for example, accessory parts such as piping, fluid inlet and outlet, valves, or equipment It is not always important to install the product in advance at the production plant. It can also be installed directly. The separation column, which has been fitted with the accessory parts inside the casing, is installed upright by a crane at the construction site after the casing is closed.
German utility model No. 20316731

  In any of the assembly methods according to the prior art disclosed in these patent documents, the casing has to be manufactured to have a very high mechanical stability, so that the material cost is not negligible. is there. That is, in any of the assembly methods, the separation column and the casing are integrated, and the whole is finally put in a vertical posture at the construction site. Therefore, the casing and the connecting portion to the separation column are integrated with each other. It must have sufficient mechanical strength to be able to bear the full weight of the separation column during the process of placing the whole upright and placing it vertically. This mechanical stability requirement goes far beyond the mechanical stability requirements required during operation after installation of such equipment. By the way, the casing of the equipment after installation is mainly responsible for the function of thermal insulation during operation, and the casing itself is not a strength member to support the separation column, but simply has the strength to withstand the load from the wind. It only has to have. In any case, producing a casing with unnecessarily high mechanical stability that is required only during the upright installation process is much less than producing a casing with the mechanical strength required for steady operating conditions. You have to bear the excessive material cost.

  In addition, when assembling and constructing this type of gas separation facility, it is necessary to take into account the temperature difference between the operation and the facility. Assembling and construction are performed in a relatively warm environment (ambient temperature), but in the process where the equipment is actually operated to perform gas separation, for example, in an air separation equipment, a part of the equipment is extremely low temperature (60-80K). However, there are some parts that are placed in a sufficiently warm environment. This difference in temperature causes a difference in the thermal expansion of each part material, and this has a specific effect on various accessories and their connection meeting parts such as piping and equipment, fluid inlet and outlet, or valves. become. Therefore, when assembling and constructing the equipment, it is necessary to take into account the influence of different thermal expansion in each part during operation, especially with regard to the arrangement of each component part, which also requires operation from the outside of the casing after installation. This contributes to an increase in costs associated with the manufacture of certain parts and installation in a separation column.

  Therefore, the main object of the present invention is not only to ensure that the gas separation equipment is easily assembled at the construction site, but at the same time minimize the material cost and construction cost for the casing compared to the prior art. It is an object of the present invention to provide an assembly method that can be used.

The present invention includes a separation column and a casing that surrounds the separation column, and the separation column is any one of pipes, fluid inlets and outlets, valves, or instruments along the longitudinal main axis. The present invention provides a method for assembling a gas separation facility of a type to which one or more accessory parts are attached.
a) a process for producing a separation column in advance at a production factory;
b) attaching at least one piping bridging module consisting of a parallelepiped, cylinder, or elliptical cylindrical frame for fixing the accessory part to the outer peripheral surface of the separation column;
c) Place the separation column on the construction site of the gas separation facility so that its main axis is substantially horizontal, and one or more piping bridge modules on the outer periphery of the upper half of the separation column in this horizontal state Attaching at least part of the accessories to the
d) pre-constructing at least a portion of the overall height of the casing at the construction site from the lower part in a vertical orientation, leaving the upper part of the casing open;
e) a step of standing the separation column with attached accessories in a horizontal state in a vertical posture, and introducing the vertical separation column into the casing from the upper portion of the casing in an open state;
f) Thereafter, the remaining portion of the casing is constructed to close the upper portion of the casing.

  The assembly method according to the basic philosophy of the present invention includes a stage in which a separation column manufactured in advance at a manufacturing factory is transported to a construction site, and attachment parts such as piping, fluid inlet and outlet, valves, or equipment. And at least partially performing the installation at the construction site. According to the present invention, these accessory parts are attached to the upper half of the outer peripheral surface of the separation column (the outer surface facing away from the ground). According to the present invention, these accessory parts are fixed to a pipe bridging module made of a parallelepiped, cylindrical, or elliptical cylindrical frame. According to the present invention, these piping bridge modules can be standardized and used for fixing all the accessory parts, so that the arrangement of the accessory parts can be specified in advance as well as necessary for the gas separation facility. Therefore, it is possible to greatly reduce the work costs related to assembly and construction. The calculation of individual length changes due to thermal expansion can be greatly simplified since it can be standardized for fixing to the piping bridge module. The installation of the piping bridging module itself to the separation column can be done completely or partially at the production plant, as is the attachment of accessories to the module, or it can also be done directly on the separation column at the construction site. It may be attached. In addition, since the attachment parts are attached while the separation column is in a horizontal state, the actual attachment work can be performed substantially at the ground level rather than at a high place. In other words, when attaching the accessory parts, a scaffold may be constructed at a height substantially equal to the diameter of the column in the horizontal separation column. Simultaneously with this mounting operation, at least a portion of the overall height of the casing can be constructed from the lower part in a vertical orientation, and the upper part of the casing is still left open. After that, the separation column assembled after attaching the attached parts to a predetermined stage is brought upright in a vertical position by, for example, a crane, and the vertical separation column is introduced into the casing from the opened upper part of the casing. Secure to the foundation structure. After that, if there are accessory parts that have not been installed or have not been installed, the installation work is completed for the separation column installed in the casing in the vertical orientation. This can be done using a working scaffold placed on the frame of the casing itself. The casing constitutes a cold box for heat insulation shielding, and finally the casing surrounding the entire height of the separation column is constructed and the upper part is closed, and then connection work such as external piping is performed Nor.

  Here, with respect to the piping bridging module, a parallelepipedal, cylindrical, or elliptical cylindrical frame has a substantially rectangular, circular, or elliptical base, as will be readily understood from the spirit of the present invention. This means a cylindrical frame, and particularly for a parallelepiped frame, the corners may be chamfered or rounded.

  In the method for assembling the gas separation equipment according to the present invention, the casing is constructed in the vertical orientation at the construction site, so that the separation column and the casing are not integrated as in the prior art, but the separation column manufactured in advance at the manufacturing factory. Only the separation column after attaching the attached parts etc. is installed upright in the vertical position with a crane etc. and inserted from the upper part of the casing that is separately constructed in the vertical position at the construction site. Just install it inside. Therefore, the casing can be constructed to meet the required limit of its mechanical stability to meet the operating conditions of the separation column, and when the entire separation column and casing are integrated and transported upright as in the prior art, There is no need to make the structure unnecessarily sturdy to meet the mechanically harsh conditions. In addition, the main installation work of the piping bridging module and attached parts to the separation column can be performed when the separation column is in a horizontal state, so that the installation work is not performed at a high place but is as low as the diameter of the separation column. It can be done safely at the ground level with a scaffold, and a small amount of scaffolding material will be required if it is performed on a horizontally moving scaffold. As a result, not only can the material cost of the casing be reduced, but also the costs associated with the working scaffold for assembly at the construction site can be minimized.

  In a preferred embodiment of the invention, before the separation column is introduced from the upper part of the casing into the casing, a height part that reaches one third to one half of the total height of the casing is pre-constructed. Again, the upper part of the casing is left open until the separation column is finally installed and closed.

  In another preferred embodiment of the present invention, before the separation column is brought upright and introduced into the casing in the vertical orientation, the pipe, the fluid feed on the outer peripheral surface of the upper half of the horizontal separation column. All of the accessory parts consisting of one or more of the inlet and outlet, valves, or equipment are completely attached to the piping bridge module. After that, the separation column after the attachment of the attached parts and the like is installed upright in the vertical orientation, inserted from the upper part of the casing constructed in a separate vertical orientation, and installed in the casing.

  In yet another preferred embodiment of the present invention, the pressure test, quality inspection, or welding on the separation column when the separation column is upright and in a horizontal state before being introduced into the casing in a portrait orientation. An X-ray transmission test on the seam is performed. When the separation column is in a horizontal position, it is possible to work very easily in close proximity to all parts where testing or inspection is indispensable from above the low ground level scaffolding. Safety can be ensured and work costs can be reduced.

  According to still another preferred embodiment of the present invention, the plurality of piping bridging modules are arranged on the outer peripheral surface of the separation column at a regular interval of 6 to 8 m along an axis parallel to the main axis of the separation column. It is attached. According to the assembling method according to the present invention, this axis is an attachment reference line set on the ridge line of the upper half of the outer peripheral surface of the column when the separation column is in a horizontal state. Thus, the construction work of the gas separation facility can be further simplified by arranging the pipe bridging module along a single axis. That is, the piping bridging module specifies the mounting positions of all accessory parts in advance, and therefore, by attaching each piping bridging module along a single axis as the mounting reference line, the separation column is Even before being installed upright and in a vertical orientation, the accessory can be attached to the appropriate mounting position for the horizontal separation column.

  In this invention, it is preferable that the frame which comprises a piping bridge module shall be made from chromium nickel steel. It has been confirmed that this frame is particularly advantageous when configured as a cubic frame.

  According to still another preferred embodiment of the present invention, a pipe bridging module surrounds a flanged part that can be operated from the outside of the casing among the accessory parts with a heat insulating material inside. The method further includes the step of mounting a partition for forming a certain volume portion that is not filled. This partition wall surrounds a flanged part that can be operated by an operator approaching from the outside of the casing, and the space between the casing and the separation column is not filled with a heat insulating material (ie, a cold box heat insulating material: perlite). Any hollow body that forms a certain volume portion may be used. In the gas separation facility, it is prohibited to surround the flange connection portion of the flanged part accessible from the outside with a heat insulating material (pearlite) for safety reasons. For example, in order to allow external access to flange-attached accessories such as measuring instruments, it is preferable that these accessory parts are surrounded by the partition wall and the partition wall is fixed to the piping bridge module. . By disposing such a partition wall, a hollow volume portion may be formed around the flange-attached accessory, and a hollow heat insulating portion having no heat insulating material may be formed by the hollow volume portion.

  Furthermore, in order to avoid heat conduction by convection and to effectively insulate accessory parts accessible from the outside, the inside of the partition wall is preferably within a rigid area behind an airtight access port (eg manhole) to the casing. Is preferably filled with glass wool having a thickness of about 400 mm.

  According to a particularly preferred embodiment of the invention, the separation column is formed by an air separation column. This is, for example, a multi-column air separation column equipped with a high-pressure distillation column, a low-pressure distillation column, and a main condenser. In this case, the casing constitutes the wall portion of the cold box, and its internal space is filled with granular heat insulating material (pearlite) before the operation of the equipment.

  According to the present invention, in particular, assembly and construction of a gas separation facility can be facilitated, and the material cost of the casing surrounding the separation column can be reduced.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a perspective view illustrating a separation column (1) installed in a gas separation facility by the assembling method of the present invention. The separation column (1) in the state shown in the figure is a state in which the pipe bridging modules (2a, 2b, 2c, 2d) are mounted at four locations on the outer peripheral surface after being manufactured in advance at the manufacturing factory. . The separation column (1) produced in advance in the production factory is transported from the factory to the construction site of the gas separation facility. At the construction site, the separation column (1) is placed so that its main axis is substantially horizontal, and a work scaffold for mounting various parts on the outer peripheral surface of the upper half of the separation column (1) in the horizontal state. Is built. For example, the pipe bridging module (2a to 2d) may be attached partially or completely at the production factory or exclusively at the construction site. However, when installing at the construction site, this work scaffold is used. Just do it. Further, at the construction site, on the outer peripheral surface of the upper half of the separation column (1) in the horizontal state, each piping bridging module (2a to 2d) is attached to various necessary accessories of the separation column, such as piping, fluid feeding section, and the like. The delivery part, valves, or equipment is at least partially, preferably fully attached, and a flanged part that needs to be operated from the outside of the casing is surrounded by a partition wall and insulated inside. A partition mounting operation is performed to form a certain volume portion not filled with the material. The attachment work of these accessory parts and the partition mounting work are also performed using the work scaffold, and these operations on the separation column are essentially performed at the ground level. Therefore, the working scaffold may be a scaffold having a relatively low height corresponding to the diameter of the separation column (1), and the scaffolding material required for the construction may be much smaller than the scaffold for working at high places, and the cost required for the scaffolding. Can be suppressed. Concurrently with the attachment work of the attachments to the horizontal separation column (1), the casing vertically extends from the bottom up to the half height part of the total height, for example, on the foundation structure already built at the installation position of the construction site. Constructed in an orientation, except that the upper part of the casing is still left open. The separation column (1), which has finished the attachment work of each accessory, is lifted upright in a vertical posture by a crane after dismantling the scaffold, and is still in an open state of the casing constructed to half the total height. It is suspended in the casing from above. The separation column is then secured to the foundation structure within the casing, after which the remainder of the casing is constructed to form a cold box that surrounds the entire circumference of the separation column for adiabatic shielding. Finally, the upper part of the casing is closed, and connection work such as external piping is performed to complete the assembly.

It is a perspective view which shows an example of the separation column installed in the gas separation installation by the assembly method of this invention.

Explanation of symbols

1: Separation columns 2a, 2b, 2c, 2d: Piping bridge module

Claims (7)

A separation column (1) and a casing surrounding the separation column are provided, and the separation column (1) includes pipes, fluid inlets and outlets, valves, or devices along the main axis in the longitudinal direction. In the assembly method of the gas separation equipment of the type in which any one or more accessory parts are mounted,
a) producing the separation column (1) in advance at the production factory;
b) attaching at least one piping bridging module (2a, 2b, 2c, 2d) made of a parallelepiped, cylindrical, or elliptical cylindrical frame for fixing the accessory part to the outer peripheral surface of the separation column; ,
c) Place the separation column (1) on the construction site of the gas separation facility so that its main axis is substantially horizontal, and place one on the outer circumference of the upper half of the separation column (1) in this horizontal state. A step of at least partially attaching the accessory part to the pipe bridging module (2a, 2b, 2c, 2d);
d) pre-constructing at least a portion of the overall height of the casing from the lower part in a vertical orientation at the construction site, leaving the upper part of the casing open;
e) a step of standing the separation column (1) to which the accessory is attached in a horizontal state in an upright posture, and introducing the separation column in the vertical posture into the casing from the upper portion of the opened casing;
and f) a method of assembling the remaining part of the casing and then closing the upper part of the casing.   Before the separation column (1) is introduced into the casing from the upper part of the casing, a height part reaching one third to one half of the total height of the casing is pre-constructed and the upper part of the casing remains open. The assembling method according to claim 1, wherein the assembling method is left.   Before the separation column (1) stands upright and is introduced into the casing in a vertical orientation, the pipe, fluid inlet and outlet, valve on the outer peripheral surface of the upper half of the horizontal separation column (1) The assembly according to claim 1 or 2, characterized in that all of the accessory parts comprising at least one of a kind and a device are completely attached to the pipe bridging module (2a, 2b, 2c, 2d). Method.   When the separation column (1) is upright and in a horizontal state before being introduced into the casing in a vertical orientation, a pressure test, quality inspection on the separation column (1), or an X-ray transmission test on the welding seam is performed. The assembly method according to claim 1, further comprising a step.   A plurality of piping bridging modules (2a, 2b, 2c, 2d) are arranged on the outer peripheral surface of the separation column (1) at regular intervals of 6 to 8 m along an axis parallel to the main axis of the separation column (1). The assembly method according to claim 1, wherein the assembly method is attached.   For the pipe bridging module (2a, 2b, 2c, 2d), a volume portion surrounding the periphery of the flanged part that can be operated from the outside of the casing among the accessory parts and not filled with the heat insulating material inside. The assembly method according to claim 1, further comprising a step of mounting a partition wall for forming.   The assembly method according to claim 1, wherein the separation column is formed by an air separation column.

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