JP5865008B2 - LNG satellite equipment - Google Patents

Description

  The present invention relates to a gas supply facility that evaporates and vaporizes liquefied natural gas (LNG) and supplies it to a consumer in a gaseous state.

  Liquefied natural gas (LNG) is stored in a liquid form in a tank, evaporated and vaporized by a vaporizer or the like, and supplied in a gaseous state as an important industrial technique in each industrial field. When using LNG, for example, LNG is received and stored in a receiving base from a tanker or the like, vaporized by a vaporizer, and then supplied to LNG utilization equipment (see, for example, Patent Document 1). In addition, as an LNG supply mode, there is an LNG satellite facility in which LNG, which is subdivided from a receiving base and transported by a tank lorry or the like, is stored in a liquid storage tank, evaporated and vaporized by a vaporizer, and supplied to consumers. It is known (see, for example, Patent Document 2). The demand for LNG satellite facilities has been increasing in recent years as a base for supplying LNG as a fuel in place of heavy oil, kerosene, and propane to areas far from urban areas. The LNG satellite facility has a capacity capable of evaporating LNG from several hundred kilograms to several tons per hour, for example, and is a fuel gas that replaces heavy oil, kerosene and propane at remote locations away from the LNG receiving terminal. Is going to play a role as a supply facility.

  If natural gas leaks to the outside, it may mix with air and cause an explosion or other fire. For this reason, when installing LNG satellite equipment, piping for transferring LNG from the storage tank to the vaporizer, piping for passing the natural gas supplied from the vaporizer, etc. are welded while carefully aligning them at the installation site, for example. Was connected. Specifically, the pipe is connected after the storage tank and the vaporizer are installed, but it is necessary to appropriately attach equipment such as an emergency shutoff valve, a gas pressure adjusting valve, a safety valve, and a manual valve to the pipe. Here, from the viewpoint of preventing gas leakage, it has been required to accurately align the pipe and the equipment attached to the pipe in the height direction and the horizontal direction during pipe welding. However, the welding work at the installation site is generally an outdoor work and can be affected by the weather, and therefore requires a great deal of labor and time. In addition, there are restrictions on performing outdoor tests, such as pressure resistance inspection and airtight inspection after assembly, which are affected by the weather.

JP 10-318499 A JP 2011-145043 A

  The present invention has been conceived under such circumstances, and it is an object of the present invention to provide an LNG satellite facility suitable for accurate and safe installation in a short period of time at an outdoor installation location. Yes.

  The LNG satellite facility provided by the present invention includes a storage tank unit that stores liquefied natural gas, a vaporization unit that vaporizes liquefied natural gas, and a piping unit. The piping unit includes a two-stage frame having a lower stage and an upper stage, and the lower stage is provided with an LNG pipe for transferring liquefied natural gas from the storage tank unit to the vaporization unit. Is provided with a gas pipe through which the gas derived from the vaporization unit passes. The storage tank unit, the vaporization unit, and the piping unit are installed at a predetermined installation location.

  Preferably, the storage unit includes a storage tank for storing the liquefied natural gas, and an LNG derivation for connecting the liquefied natural gas in the storage tank to the outside of the storage tank, with an end connected to one end of the LNG pipe. A vaporizer for vaporizing liquefied natural gas; and an end connected to the other end of the LNG pipe, for introducing the liquefied natural gas into the vaporizer LNG introduction piping, and an end portion connected to the gas piping, and a gas outlet piping for leading the gas vaporized through the vaporizer to the outside of the vaporizer.

  Preferably, the storage tank unit, the vaporization unit, and the piping unit are transported to an installation place in a pre-assembled state, and pipes to be connected are flange-connected to each other.

  Preferably, at least one of the storage tank unit, the vaporization unit, and the piping unit has two or more foundation bolts corresponding to a plurality of foundation bolts that are embedded separately from each other at a place where the unit is installed. The base bolt reference position and the connection pipe reference position are positioned using a mold material that defines a reference position and a connection pipe reference position for attaching a pipe for connection to another unit in the unit. Perform during assembly.

  Preferably, the piping in the piping unit is supported by the gantry via a support, and the support has a position adjusting mechanism that adjusts the height and horizontal positions of the piping.

  Other features and advantages of the present invention will become more apparent from the detailed description given below with reference to the accompanying drawings.

It is a schematic block diagram which shows an example of the LNG satellite installation which concerns on this invention. It is a side view which shows an example of the LNG satellite installation which concerns on this invention. It is a principal part perspective view of the LNG satellite installation shown in FIG. It is the principal part perspective view which looked at the LNG satellite installation shown in FIG. 2 from the direction different from FIG. It is a side view which shows an example of a mold material. It is a front view of the mold material shown in FIG. It is a top view of the mold material shown in FIG. FIG. 6 is an exploded view of the mold material shown in FIG. 5. It is a side view for demonstrating the usage method of a mold material. It is a front view for demonstrating the usage method of a mold material. It is a XI-XI arrow line view of FIG. It is a perspective view which shows an example of a support body. It is a disassembled perspective view of the support body shown in FIG.

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

  1 to 4 show an LNG satellite facility according to an embodiment of the present invention.

  As shown in FIGS. 1 and 2, the LNG satellite facility X of the present embodiment includes a storage tank unit 1 that stores liquefied natural gas (LNG), a vaporization unit 3 that vaporizes LNG, and a piping unit 2. It is configured and fixed at an outdoor installation location.

  The storage tank unit 1 includes an LNG receiving pipe 11 for receiving LNG, a storage tank 12 for storing LNG, and an LNG outlet pipe 13 for leading LNG in the storage tank 12 to the outside. Manual valves 14 and 15 are provided in the LNG receiving pipe 11 and the LNG outlet pipe 13. In the storage tank unit 1, for example, LNG transported by a tank truck is introduced into the storage tank 12 through the LNG receiving pipe 11. The outer wall of the storage tank 12 is doubled, and a heat insulating material is filled between the two walls and the pressure is reduced to a vacuum to block intrusion heat from the outside air. In this storage tank 12, LNG is stored at a temperature of at least -161.5 ° C. As an example of the dimensions of the storage tank 12, in the case of the LNG satellite facility X having a vaporization capacity of 600 kg / h, the outer diameter is about 3.2 m and the height is about 11.5 m. The LNG derived from the storage tank 12 is sent to the piping unit 2 through the LNG extraction piping 13 and the manual valve 15. An end portion (flange 13a) of the LNG outlet pipe 13 is flange-connected to an upstream end portion (flange 21a) of the LNG pipe 21 in the pipe unit 2 described later. Details of this connection portion will be described later.

  When the storage tank unit 1 is installed, for example, a foundation bolt embedded in concrete is used. As shown in FIG. 2, a plurality of legs 12a for installation are provided at the lower part of the storage tank 12, and the lower ends of these legs 12a are fixed to a plurality of foundation bolts (not shown) embedded separately from each other. Is done.

  The piping unit 2 includes an LNG piping 21 for transferring LNG from the storage tank unit 1 to the vaporizing unit 3 and a gas piping 22 for passing gaseous natural gas led out from the vaporizing unit 3. ing. The LNG pipe 21 is provided with a safety valve 211, an emergency shut-off valve 212, and a manual valve 213. Although details will be described later, when the temperature of the natural gas evaporated through the vaporization unit 3 is less than a predetermined temperature, the emergency shut-off valve 212 is closed and the introduction of LNG into the vaporization unit 3 is stopped. Yes.

  The gas pipe 22 is provided with a safety valve 221, a manual valve 222, a thermometer 223, and a flow meter 226. Further, the gas pipe 22 has a portion in which two lines are branched in parallel on the downstream side of the thermometer 223, and valves 224a and 224b (224c and 224d) and a gas pressure adjustment are provided in each line. A valve 225a (225b) is provided. One of these two lines is a spare line, and the valves 224a to 224d are used for switching the line through which the gas flows.

  In this embodiment, the piping unit 2 includes a two-stage pedestal 23 having a lower step portion 23A and an upper step portion 23B as shown in FIGS. 2 to 4, for example, and the above-described LNG piping 21. The gas pipe 22 is incorporated in the gantry 23. More specifically, the LNG pipe 21 is arranged in the lower stage 23A of the gantry 23, and the gas pipe 22 is arranged in the upper stage 23B of the gantry 23. In the gas pipe 22, two lines including the gas pressure regulating valves 225 a and 225 b are arranged in parallel apart from each other in the vertical direction.

  A plate member 231 is provided between the lower step portion 23A and the upper step portion 23B of the gantry 23. At the time of inspection and maintenance of the gas pipe 22, an operator can work on the gas pipe 22 and the gas pressure regulating valves 225 a and 225 b attached to the gas pipe 22 on the plate material 231.

  A downstream end (flange 21b) of the LNG pipe 21 is flange-connected to an end (flange 32a) of an LNG introduction pipe 32 of the vaporization unit 3 described later. An upstream portion and a downstream portion of the gas pipe 22 pass through a hole 231a formed in the plate member 231 and are led to the lower step portion 23A side. An upstream end (flange 22a) of the gas pipe 22 is flange-connected to an end (flange 33a) of a gas outlet pipe 33 of the vaporizing unit 3 described later, and a downstream end (flange) of the gas pipe 22 is connected. 22b) is flange-connected to a gas supply destination pipe (not shown).

  When installing the piping unit 2, for example, a hole-in anchor is used. The piping unit 2 is placed on the concrete, and the mount 23 of the piping unit 2 is fixed by a plurality of hole-in anchors (not shown) driven into the concrete.

  As shown in FIG. 1, the vaporization unit 3 includes a vaporizer 31 for evaporating and vaporizing LNG, an LNG introduction pipe 32, and a gas outlet pipe 33. The vaporizer 31 includes a bottom plate 311, a shell-shaped housing 312, a heat transfer pipe 313 wound in a coil shape, a heat medium introduction pipe 314, a heat medium overflow pipe 315, and a heat medium that communicates with the heat medium overflow pipe 315. The lead-out pipe 316 is provided. An appropriate sealing material (not shown) is interposed between the bottom plate 311 and the housing 312 so that the inside of the housing 312 is kept sealed.

  The heat transfer tube 313 extends upward in a coil shape from the bottom plate 311 inside the housing 312, and then is folded downward to reach the bottom plate 311. The upstream end of the heat transfer tube 313 communicates with the LNG introduction pipe 32, and the downstream end of the heat transfer tube 313 communicates with the gas outlet pipe 33. The LNG transferred from the storage tank unit 1 is introduced into the heat transfer tube 313 via the LNG introduction pipe 32.

  Manual valves 317 and 318 are provided in the heat medium introduction pipe 314 and the heat medium lead-out pipe 316, and hot water as a heat medium, for example, is introduced into the housing 312 through the heat medium introduction pipe 314. The temperature of the hot water is about 60 ° C., for example. The surroundings of the heat transfer tube 313 are filled with hot water, and the LNG in the heat transfer tube 313 is heated by the hot water that is the heat medium, and is heated to evaporate to become a gas state (natural gas). The evaporated natural gas is supplied to the piping unit 2 side through the gas outlet piping 33. At this time, the temperature of the natural gas is about 0 ° C. On the other hand, the hot water in the housing 312 is cooled by the LNG in the housing 312 and cooled down, and then flows into the inside from the upper end of the heat medium overflow pipe 315 and is led out through the heat medium outlet pipe 316. In this embodiment, the heat transfer pipe 313, the heat medium introduction pipe 314, the heat medium overflow pipe 315, and the heat medium outlet pipe 316 are fixed to the bottom plate 311. According to such a configuration, all the components including the heat transfer tube 313 can be directly inspected and maintained by simply removing the covering housing 312 from the bottom plate 311.

  The natural gas evaporated and vaporized in the vaporization unit 3 is introduced into the gas pipe 22 of the pipe unit 2. When natural gas passes through the gas pipe 22, the temperature of the natural gas is measured by the thermometer 223. Depending on the measured temperature, opening / closing of the emergency shutoff valve 212 provided in the LNG pipe 21 is determined. Here, when the temperature of the natural gas has not risen to, for example, 0 ° C. or more, the heating with the heat medium in the vaporizer 31 is not sufficient, so the emergency shutoff valve 212 is closed and the LNG to the vaporization unit 3 is closed. Stop the introduction of. The natural gas flowing in the gas pipe 22 passes through one of the two branch lines, is adjusted to a desired pressure by one of the gas pressure regulating valves 225a and 225b, and is sent to the supply destination. . The amount of gas supplied to the supply destination is measured and managed by the flow meter 226.

  When the vaporizing unit 3 is installed, for example, a foundation bolt embedded in concrete is used. As shown in FIGS. 2 to 4, a mounting leg 319 is provided at the lower part of the vaporizer 31, and a plurality of foundation bolts (not shown) in which the lower ends of these legs 319 are embedded separately from each other. Fixed by.

  The storage tank unit 1, the piping unit 2, and the vaporizing unit 3 are each assembled in advance in the manufacturing factory, and are transported to the installation place in a united state. The assembly of the storage tank unit 1 is performed by the following procedure, for example.

  In the present embodiment, the storage tank unit 1 is assembled using a mold material. When producing the storage tank unit 1, the mold material includes two or more basic bolt reference positions corresponding to a plurality of basic bolts for fixing the storage tank unit 1 at the installation location, and an LNG lead-out pipe 13 for connection to the piping unit 2. It is for prescribing the connection piping reference position for attachment.

  5 to 7 show an example of such a mold material. In the present embodiment, the mold material 4 is obtained by appropriately connecting steel materials such as a channel member and a steel plate by a technique such as welding or bolt fastening, and the first mold material portion 41, the second mold material portion 42, and the third mold material portion 43. It has. The first mold part 41 has two holes 41 a that define the base bolt reference position of the storage tank unit 1 at both ends of the long channel member. The second mold part 42 is made of a metal plate, and has concave grooves 42a and 42b formed on both sides in the thickness direction. The concave groove 42a defines a connection pipe reference position, and has the same size as the flange 13a of the LNG lead-out pipe 13, so that the flange 13a can be fitted therein. The concave groove 42b has the same size as the flange 21a of the LNG pipe 21 of the pipe unit 2 and can be fitted with the flange. The third mold part 43 defines height positions at two locations on the gantry 23 of the piping unit 2 and has a predetermined length in the vertical direction. The first to third mold parts 41, 42, 43 are connected by, for example, bolt fastening, and can be disassembled from each other as shown in FIG.

  When the storage tank unit 1 is manufactured, the base bolt reference position and the connection pipe reference position are positioned using the mold member 4 having the above-described configuration. Specifically, as clearly shown in FIG. 11, among the four legs 12 a provided in the storage tank 12, the base bolt mounting holes 12 b in the lower end plates of the two legs 12 a are replaced with the holes 41 a of the mold material 4. Form while aligning with the reference. As shown in FIGS. 9 and 10, the LNG lead-out pipe 13 is attached to the storage tank 12 by fitting the flange 13 a of the LNG lead-out pipe 13 into the concave groove 42 a of the mold material 4 and aligning it. In this way, when the storage tank unit 1 is assembled, the foundation bolt mounting hole 12b (base bolt reference position) and the LNG lead-out pipe 13 (connection pipe reference position) are positioned. In addition, the assembly operation of the storage tank unit 1 in the production factory using the mold 4 can be performed in a posture in which the storage tank 12 having a high height is laid down. The tank unit 1 can be assembled using only the first and second mold parts 41 and 42 of the mold 4.

  When the piping unit 2 is assembled, the mold 4 is used to position the connection flange 21a on the storage unit 1 side of the LNG piping 21 (see FIGS. 9 and 10). As a result, the flange 21a of the LNG pipe 21 is assembled in a predetermined posture at a position (height direction position and horizontal position) away from the gantry 23 by a predetermined distance.

  Appropriate locations of the LNG pipe 21 and the gas pipe 22 in the pipe unit 2 are supported by the mount 23 via a support 24 shown in FIG. 12, for example. The support 24 includes a fixing bracket 241 fixed to the gantry 23, a support member 242 connected to the fixing bracket 241, and a U bolt 243 attached to the support member 242. As shown in FIG. 13, a pair of bolt holes 241 a are formed in the fixing bracket 241 so as to be separated from each other in the vertical direction. A pair of long holes 242a corresponding to the pair of bolt holes 241a are formed in the lower part of the support member 242 so as to extend vertically. The support member 242 is common to the corresponding bolt holes 241a and the long holes 242a. The bolts 244 inserted are connected to the fixing bracket 241. Thereby, the support member 242 can change the position in the height direction within a certain range with respect to the fixing bracket 241.

  A pair of elongated holes 242b corresponding to the pair of screw portions 243a of the U bolt 243 are formed on the support member 242 so as to extend in the direction in which the pair of screw portions 243a are arranged. Thereby, the U-bolt 243 can change the horizontal position within a certain range with respect to the support member 242. The LNG pipe 21 (gas pipe 22) is fixed by being sandwiched between the support member 242 and the U bolt 243 configured as described above. Therefore, for the LNG pipe 21 (gas pipe 22) incorporated in the pipe unit 2, the mounting position of the support member 242 with respect to the fixing bracket 241 and the mounting position of the U bolt 243 with respect to the support member 242 are changed. Thus, the position in the height direction and the horizontal direction can be adjusted. The support 24 having such a configuration functions as a position adjustment mechanism that adjusts the height and horizontal positions of the LNG pipe 21 and the gas pipe 22. In addition, description of the support body 24 is abbreviate | omitted in drawings other than FIG. 12 and FIG.

  On the other hand, the above-described mold material 4 is used at the installation location of the storage tank unit 1 to define the mounting position of the foundation bolt. For example, as understood with reference to FIGS. 9 to 11, the foundation bolt is positioned by determining the mounting position of the foundation bolt (not shown) using the mold material 4 and then placing concrete. Embedded in concrete.

  In addition, although detailed illustration description is abbreviate | omitted, when assembling the vaporization unit 3, the mold material for vaporization units (different from said mold material 4) is used. The mold material for the vaporization unit is used for attaching two or more basic bolt reference positions corresponding to a plurality of basic bolts for fixing the vaporization unit 3 at the installation location, and the LNG introduction pipe 32 for connection to the piping unit 2. This is for defining the connection pipe reference position.

  In the LNG satellite facility X of the present embodiment, the storage tank unit 1, the piping unit 2, and the vaporizing unit 3 are transported to an outdoor installation place and installed and fixed in a unitized state in the manufacturing factory. For this reason, almost all the pipes necessary for the LNG satellite facility X are assembled in advance in the three units 1, 2, and 3, and the pressure resistance test, the airtight test, etc. of the pipes can be completed in the production factory. . Therefore, when installing the storage tank unit 1, the piping unit 2, and the vaporizing unit 3 in the field, it is only necessary to flange-connect the predetermined piping of the piping unit 2 to the storage tank unit 1 and the vaporizing unit 3, and easily in a short period of time. An LNG satellite facility X can be installed. Further, according to the present embodiment, since welding work is not required at the installation site, the installation of the LNG satellite facility X is hardly affected by the weather. This is preferable for shortening the installation period of the LNG satellite facility X.

  In the piping unit 2, the LNG piping 21 and the gas piping 22 are incorporated in a two-stage frame 23. For this reason, the piping necessary as the piping unit 2 and the devices attached thereto (for example, the safety valves 211 and 221, the emergency shut-off valve 212, the gas pressure regulating valves 225 a and 225 b) are efficiently placed in the three-dimensional space formed by the mount 23. As a result, the installation area of the piping unit 2 can be reduced. This contributes to the compactness of the LNG satellite facility X.

  In the piping unit 2, a plate member 231 is provided between the lower step portion 23A and the upper step portion 23B of the gantry 23, and the LNG pipe 21 is disposed in the lower step portion 23A. The LNG pipe 21 is a pipe to be inspected by the High Pressure Gas Safety Law, and management and inspection standards are determined. In the present embodiment, by arranging the LNG pipe 21 in the lower step portion 23A, the plate material 231 above the LNG pipe 21 serves as a roof. For example, even if there is snow, the load is LNG It does not act on the pipe 21. In addition, the LNG pipe 21 arranged in the lower step portion 23A is not directly exposed to sunlight or wind and rain by the plate member 231 positioned above, and is preferable from the viewpoint of preventing deterioration.

  By using the mold material 4 as described above in advance at the installation location, when the storage tank unit 1 is installed at the site, the location of the two or more foundation bolts and the LNG are not directly placed temporarily at the installation location. The position of the outlet pipe 13 is accurately defined. Thereby, the storage tank unit 1 can be correctly installed in a desired position (a height direction position and a horizontal direction position).

  With respect to the piping unit 2 adjacent to the storage tank unit 1, the height position of the gantry 23 is almost accurately defined by using the above-described mold material 4 when installed on site. And as shown in FIG. 10, the height position of the piping unit 2 can be accurately determined by inserting the thin plate 25 into the gap between the upper surface of the foundation concrete and the mount 23 and adjusting the height of the mount 23. .

  As can be understood from FIGS. 9 and 11, the storage tank unit 1 and the piping unit 2 using the mold material 4 having the concave grooves 42 a and 42 b for defining the flange positions of the LNG outlet piping 13 and the LNG piping 21. Therefore, at the installation location, the position of the flange 13a of the LNG outlet pipe 13 and the position of the flange 21a of the LNG pipe 21 substantially coincide. As a result, it is possible to easily and accurately connect the storage tank unit 1 and the piping unit 2 on site.

  As described above with reference to FIGS. 12 and 13, the LNG pipe 21 and the gas pipe 22 in the pipe unit 2 can be adjusted in the height direction and the horizontal direction. As a result, when the piping unit 2 and the storage tank unit 1 are connected locally or when the piping unit 2 and the vaporizing unit 3 are connected locally, the piping position can be finely adjusted. Two or three can be connected appropriately and quickly.

  While specific embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications can be made without departing from the spirit of the invention. The specific configuration of each part of the LNG satellite facility according to the present invention is not limited to the above embodiment.

X LNG satellite facility 1 Storage unit 12 Storage tank 13 LNG outlet piping 2 Piping unit 21 LNG piping 22 Gas piping 23 Mounting base 23A Lower stage 23B Upper stage 24 Support body 3 Vaporizing unit 31 Vaporizer 32 LNG inlet piping 33 Gas outlet piping 4 Mold material

Claims (2)

A storage tank unit for storing liquefied natural gas;
A vaporization unit for vaporizing liquefied natural gas;
A two-stage frame having a lower stage and an upper stage, an LNG pipe arranged in the lower stage, for transferring liquefied natural gas from the storage tank unit to the vaporization unit, and arranged in the upper stage, the vaporization unit A piping unit having a gas pipe through which the gas derived from
An LNG satellite facility in which the storage unit, the vaporization unit, and the piping unit are installed at a predetermined installation location. The storage unit includes a storage tank for storing liquefied natural gas, an LNG outlet pipe that has an end connected to one end of the LNG pipe, and extracts the liquefied natural gas in the storage tank to the outside of the storage tank, With
The vaporization unit includes a vaporizer for vaporizing liquefied natural gas, an LNG introduction pipe for introducing the liquefied natural gas into the vaporizer, the end of which is connected to the other end of the LNG pipe, 2. The LNG satellite facility according to claim 1, further comprising: a gas outlet pipe having an end connected to the gas pipe and leading the gas vaporized through the vaporizer to the outside of the vaporizer.

Images