JP2019174198A - Method for measuring temperature in heat transfer tube - Google Patents

Abstract

To provide a method for measuring the temperature in a heat transfer tube with which it is possible to measure the temperature in a heat transfer tube that changes in accordance with the progress of vaporization of a liquified natural gas in the middle of circulating in the heat transfer tube.SOLUTION: While an inlet side header chamber 23 and an outlet side header chamber 24 are connected by a heat transfer tube 22, with the heat transfer tube 22 arranged inside of a heating chamber 21 in which a fluid for heating circulates, and a sheathed thermocouple N having had a single thermocouple wire or a plurality of thermocouple wires differentiated in temperature measurement point along the longitudinal direction of a protective tube inserted into the inside of the protective tube is inserted from an opening end of the inlet side header chamber 23 in the heat transfer tube 22 toward an opening end of the outlet side header chamber 24, the temperature inside of the heat transfer tube 22 at one or a plurality of points in the longitudinal direction is measured with the sheathed thermocouple N.SELECTED DRAWING: Figure 12

Description

In the present invention, the inlet side header chamber and the outlet side header chamber are connected by a heat transfer tube,
The said heat exchanger tube is related with the temperature measuring method in the heat exchanger tube arrange | positioned inside the heating chamber in which the fluid for a heating flows.

As an apparatus provided with the heat exchanger tube connected to an inlet side header chamber and an outlet side header chamber, there exists an LNG vaporizer, for example.
The LNG vaporizer heats liquefied natural gas (LNG) having a temperature of about −160 ° C. while flowing through a heat transfer tube to vaporize the natural gas at a target temperature (for example, about −40 ° C.). (For example, refer to Patent Document 1).
In Patent Literature 1, it is confirmed that the liquefied natural gas is properly vaporized into the natural gas by measuring the temperature of the natural gas sent out from the outlet side header chamber.

JP 2016-102554 A

In LNG vaporizers, there is a desire to measure the progress of vaporization during the flow of liquefied natural gas through a heat transfer tube. For devices equipped with a heat transfer tube, the fluid to be heated is flowing through the heat transfer tube. There is a desire to measure the temperature inside the heat transfer tube to check the temperature.
In other words, in the LNG vaporizer, if it is known that the liquefied natural gas as the heating target fluid flowing through the heat transfer tube is vaporized into the natural gas before flowing into the opening end portion of the outlet side header chamber in the heat transfer tube. If the progress of vaporization in the middle of the flow of liquefied natural gas through the heat transfer tube, such as shortening the length of the heat transfer tube to reduce the size of the LNG vaporizer, improve the LNG vaporizer. validate.

  The present invention has been made in view of the above circumstances, and its purpose is to provide a heat transfer tube in which the temperature in the heat transfer tube can be measured in order to confirm the temperature during the flow of the heating target fluid through the heat transfer tube. It is in providing a temperature measurement method.

In the present invention, the inlet side header chamber and the outlet side header chamber are connected by a heat transfer tube,
The heat transfer tube is a method for measuring a temperature in a heat transfer tube disposed inside a heating chamber in which a heating fluid flows, and the characteristic configuration thereof is:
A single thermocouple wire or a sheath thermocouple in which a plurality of thermocouple wires having different temperature measurement points along the longitudinal direction of the protective tube are inserted into the protective tube, the inlet-side header in the heat transfer tube The temperature of one or a plurality of locations in the longitudinal direction inside the heat transfer tube is measured by the sheath thermocouple while being inserted from the opening end of the chamber toward the opening end of the outlet-side header chamber. .

In other words, the sheath thermocouple in which one or more thermocouple wires are inserted into the protective tube is inserted from the opening end portion of the inlet-side header chamber to the opening end portion of the outlet-side header chamber in the heat transfer tube. To do.
And the temperature of the one or several places in the longitudinal direction inside a heat exchanger tube is one temperature measurement point, or the several temperature measurement point which made the position differ along the longitudinal direction of the protective tube in a sheath thermocouple. measure.

  Thus, since the temperature of one or a plurality of locations in the longitudinal direction inside the heat transfer tube can be measured, for example, in the LNG vaporizer, it changes according to the progress of vaporization while the liquefied natural gas flows through the heat transfer tube. The temperature inside the heat transfer tube can be measured in order to confirm the temperature in the middle of the fluid to be heated flowing through the heat transfer tube, such as measuring the temperature inside the heat transfer tube.

  In short, according to the characteristic configuration of the temperature measuring method in the heat transfer tube of the present invention, the temperature in the heat transfer tube can be measured in order to confirm the temperature in the middle of the fluid to be heated flowing in the heat transfer tube.

A further characteristic configuration of the temperature measuring method in the heat transfer tube of the present invention is provided in the inlet-side header chamber, an insertion tube portion through which the sheath thermocouple is inserted across the inside and outside of the inlet-side header chamber,
The cylindrical holding frame through which the sheath thermocouple is inserted is a state in which the holding frame side flange portion provided at the end portion on the existence side of the inlet side header chamber is connected to the cylinder side flange portion at the tip of the insertion cylinder portion Provided in
The sheath thermocouple is installed in a form to be inserted into the heat transfer tube via the holding frame, the insertion cylinder and the inlet header chamber, and then the sheath thermocouple is attached to the holding frame. It is in the point which mounts the seal | sticker part which hold | maintains in a sealing state.

  That is, the sheath thermocouple is installed in a form that is inserted into the heat transfer tube via the holding frame connected to the insertion cylinder provided in the inlet header chamber, the insertion cylinder, and the inlet header chamber. After that, since the seal portion for holding the sheath thermocouple in a sealed state is attached to the holding frame, for example, the compensation conductor provided on the proximal end side of the sheath thermocouple is projected outward from the holding frame. Measuring the temperature of one or more temperature measurement points of the sheath thermocouple, such as measuring the temperature of one or more temperature measurement points of the sheath thermocouple using a measuring instrument outside the header chamber on the inlet side. It can be performed well outside the header chamber on the inlet side.

  As described above, while making it possible to satisfactorily measure the temperature at one or more temperature measurement points of the sheath thermocouple outside the inlet side header chamber, the holding frame side flange portion and the cylinder side flange portion By connecting, the holding frame and the sheath thermoelectric unit are attached to the holding frame with a seal part that suppresses leakage of the fluid to be heated between the holding frame and the insertion cylinder part and holds the sheath thermocouple in a sealed state. By suppressing the leakage of the fluid to be heated between the pair, the leakage of the fluid to be heated can be appropriately suppressed.

  In short, according to the further characteristic configuration of the temperature measurement method in the heat transfer tube of the present invention, the temperature of one or more temperature measurement points of the sheath thermocouple can be measured in a state in which leakage of the fluid to be heated is appropriately suppressed. This can be performed well outside the header chamber on the inlet side.

A further characteristic configuration of the method for measuring a temperature in a heat transfer tube according to the present invention is that the traction cord is protruded from an opening end of the outlet header chamber in the heat transfer tube and the other end is the holding frame. In a state protruding from the heat transfer tube, the inlet side header chamber, the insertion tube portion and the holding frame are installed in a form to be inserted,
Next, by connecting the other end of the traction cord and the tip of the sheath thermocouple, and pulling the one end of the traction cord, the sheath thermocouple is Move until the tip protrudes from the open end of the outlet header chamber,
Next, after releasing the connection between the other end portion of the pulling cord and the distal end portion of the sheath thermocouple, the proximal end portion of the sheath thermocouple located outside the holding frame is pulled. By adjusting the distal end portion of the sheath thermocouple to a predetermined position inside the heat transfer tube,
Thereafter, the seal portion is attached to the holding frame.

That is, first, the traction cord-like body is inserted into the heat transfer tube, the inlet-side header chamber, and the insertion tube so that one end projects from the opening end of the outlet-side header chamber in the heat-transfer tube and the other end projects from the holding frame. It will install in the form which penetrates a cylinder part and a holding frame.
A wire or the like can be used as the tow cord.
And, in the state where one end part protrudes from the opening end part of the outlet side header chamber in the heat transfer tube and the other end part protrudes from the holding frame, the tow rope is inserted into the heat transfer pipe, the inlet side header chamber, and the insertion cylinder part. In order to install in a form through which the holding frame is inserted, for example, the traction cord is pushed and moved from the opening end portion of the outlet side header chamber in the heat transfer tube toward the opening end portion of the inlet side header chamber in the heat transfer tube. The portion protruding from the opening end of the inlet-side header chamber can be satisfactorily performed by a procedure such as pushing and moving the insertion cylinder and the holding frame.

  Next, by connecting the other end of the traction cord and the tip of the sheath thermocouple, and pulling one end of the traction cord, the tip of the sheath thermocouple becomes the outlet header chamber. Until it protrudes from the opening end of the cable, and then after the connection between the other end of the traction cord and the tip of the sheath thermocouple is released, the sheath thermocouple is positioned outside the holding frame. By pulling the base end side portion to be adjusted, the distal end portion of the sheath thermocouple is adjusted to be installed at a predetermined position inside the heat transfer tube.

As described above, when the sheath thermocouple is inserted into the heat transfer tube, although the tensile force acts on the sheath thermocouple, the pushing movement force does not act on the sheath thermocouple, so that the sheath thermocouple can be prevented from being damaged.
That is, when the sheath thermocouple is inserted into the heat transfer tube, for example, the sheath thermocouple is pushed and moved from the opening end portion of the inlet side header chamber of the heat transfer tube toward the opening end portion of the outlet side header chamber of the heat transfer tube. In this case, there is a risk of damage such as bending of the sheath thermocouple, but the sheath thermocouple can be inserted into the heat transfer tube without such damage.

  Then, when the insertion of the sheath thermocouple into the heat transfer tube is completed, the installation of the sheath thermocouple is completed by mounting the seal portion that holds the sheath thermocouple in a sealed state on the holding frame.

  In short, according to the further characteristic configuration of the temperature measurement method in the heat transfer tube of the present invention, the sheath thermocouple can be installed in a state inserted into the heat transfer tube while suppressing damage to the sheath thermocouple.

  A further characteristic configuration of the temperature measuring method in the heat transfer tube of the present invention is that a plurality of the sheath thermocouples are provided in a form of being inserted into different heat transfer tubes.

  That is, a plurality of sheathed thermocouples are installed in a form to be inserted into different heat transfer tubes, and, for example, in an LNG vaporizer, the liquefied natural gas changes according to the progress of vaporization while flowing through the heat transfer tubes. For example, the temperature in the middle of the fluid to be heated flowing through the heat transfer tube can be measured for each of the different heat transfer tubes, for example, the temperature in the heat transfer tube is measured for each of the different heat transfer tubes.

  For example, in a case where a heat transfer tube having a normal performance and a high performance heat transfer tube with improved heat transfer performance than that of the heat transfer tube are provided, and the improvement of the equipment including the heat transfer tube is advanced, a plurality of By installing a sheathed thermocouple to the normal performance heat transfer tube and the high performance heat transfer tube, the temperature during the flow of the fluid to be heated through the heat transfer tube can be adjusted to the normal performance heat transfer tube and the high performance heat transfer tube. It can be measured for heat tubes.

  In short, according to the further characteristic configuration of the temperature measuring method in the heat transfer tube of the present invention, the temperature during the flow of the heating target fluid through the heat transfer tube can be measured for each of the different heat transfer tubes.

  A further characteristic configuration of the temperature measurement method in the heat transfer tube according to the present invention is that a contact prevention annular portion having a larger diameter than the sheath thermocouple is provided on an outer surface portion of the sheath thermocouple corresponding to the temperature measurement point. It is in the point provided.

  That is, the contact-preventing annular portion having a diameter larger than that of the sheath thermocouple contacts the inner surface of the heat transfer tube, so that the portion corresponding to the temperature measurement point in the sheath thermocouple contacts the inner surface of the heat transfer tube. Therefore, the temperature of the heating target fluid flowing in the heat transfer tube can be appropriately measured at the temperature measurement point in the sheath thermocouple.

  In short, according to the further characteristic configuration of the temperature measuring method in the heat transfer tube of the present invention, the temperature of the heating target fluid flowing in the heat transfer tube can be appropriately measured.

  A further characteristic configuration of the temperature measuring method in the heat transfer tube according to the present invention is that a linear elastic body located on the outer side toward the distal end side of the sheath thermocouple is arranged in a circumferential direction. There is in point.

  That is, since the linear elastic body provided at the distal end portion of the sheath thermocouple contacts the inner surface of the heat transfer tube, the distal end portion of the sheath thermocouple is prevented from contacting the inner surface of the heat transfer tube. The temperature of the heating target fluid flowing in the heat transfer tube can be appropriately measured at the temperature measurement point in the sheath thermocouple.

  That is, when the tip of the sheath thermocouple contacts the inner surface of the heat transfer tube, the tip of the sheath thermocouple becomes a temperature corresponding to the temperature of the inner surface of the heat transfer tube, and that temperature passes through the protective tube or the like, However, the temperature of the fluid to be heated that flows in the heat transfer tube may not be measured properly, but the tip of the sheath thermocouple is attached to the inner surface of the heat transfer tube. It is possible to appropriately measure the temperature of the heating target fluid flowing in the heat transfer tube at the temperature measurement point in the sheath thermocouple while suppressing contact.

  In short, according to the further characteristic configuration of the temperature measuring method in the heat transfer tube of the present invention, the temperature of the liquefied natural gas flowing in the heat transfer tube or the vaporized natural gas can be measured more appropriately.

Longitudinal side view showing schematic configuration of liquefied natural gas vaporizer Notched side view showing schematic configuration of LNG vaporizer Longitudinal front view showing the formation location of the insertion tube Cross-sectional plan view showing the seal VV arrow view in FIG. Exploded perspective view of seat Partially omitted plan view of a sheathed thermocouple Plan view showing the tip of a sheathed thermocouple Schematic side view showing installation procedure of sheathed thermocouple Schematic side view showing installation procedure of sheathed thermocouple Schematic side view showing installation procedure of sheathed thermocouple Schematic side view showing installation procedure of sheathed thermocouple Longitudinal side view showing seal performance evaluation device

Embodiment
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(Overall configuration of liquefied natural gas vaporizer)
As shown in FIG. 1, a liquefied natural gas vaporizer includes seawater SW (an example of a heat source fluid) and liquefied petroleum gas (LPG: liquid intermediate heat medium) as an intermediate heat medium having a boiling point lower than that of seawater SW. The intermediate heat medium vaporizer 10 that vaporizes liquefied petroleum gas (LPG) and the propane gas (PG: gaseous intermediate heat medium) vaporized in the intermediate heat medium vaporizer 10 are supplied by the heat exchange of propane By exchanging heat between the gas (PG) and the liquefied natural gas (LNG) to be vaporized, the propane gas (PG) is condensed into liquefied petroleum gas (LPG: liquid intermediate heat medium) and liquefied natural gas (LNG). It is comprised in the form provided with the LNG vaporizer 20 which vaporizes and turns into natural gas (NG).
Incidentally, the liquefied petroleum gas LPG condensed and liquefied by the LNG vaporizer 20 is returned to the intermediate heat medium vaporizer 10.

(Details of intermediate medium vaporizer)
The intermediate heat medium vaporizer 10 is configured as a shell-and-tube (multi-tube) heat exchanger, and liquefied petroleum gas (in a state where a gas phase portion is filled with propane gas (PG) is formed. A large number of LPG vaporization heat transfer tubes 12 that allow the seawater SW to flow inside the LPG vaporization shell 11 capable of storing LPG).
Each LPG vaporization heat transfer tube 12 is linear, and the inside of the LPG vaporization shell 11 is in a state where both ends are supported by the side portions of the LPG vaporization shell 11 with the tube axis aligned along the horizontal direction. Is provided.

Further, a seawater inflow chamber 13 to which one end of each LPG vaporization heat transfer tube 12 communicates is provided at a side portion on one end side of the LPG vaporization shell 11, and a side portion on the other end side of the LPG vaporization shell 11 is disposed on the side portion. A seawater outflow chamber 14 is provided in which the other end of each LPG vaporization heat transfer tube 12 communicates.
The seawater inflow chamber 13 is connected to the seawater supply path 2 through which the seawater SW flows in, and the seawater outflow chamber 14 is connected to the seawater discharge path 3 through which the seawater SW is discharged to the outside.
The seawater supply path 2 is provided with a seawater pump 4 that pumps the seawater SW.

(Details of LNG vaporizer)
Like the intermediate heat medium vaporizer 10, the LNG vaporizer 20 is configured as a shell-and-tube heat exchanger, and is filled with propane gas (PG: an example of a heating fluid). A large number (for example, about 1300) of liquefied natural gas (LNG) flow through the LNG vaporization shell 21 (an example of a heating chamber) that can store liquefied petroleum gas (LPG) in a state where the liquefied petroleum gas (LPG) is formed upward. LNG vaporization heat transfer tubes 22 (an example of a heat transfer tube) are arranged side by side.
By the way, in this embodiment, the heat transfer performance of about 30 of the LNG vaporization heat transfer tubes 22 is configured to be superior to the heat transfer performance of the other.

As shown in FIG. 2, an inlet-side header chamber 23 and an outlet-side header chamber 24 are arranged adjacent to each other on the lateral side of the LNG vaporization shell 21 in a state of being partitioned from each other by a partition plate 25. A heat transfer tube support plate 26 is provided between the LNG vaporization shell 21 and the inlet-side header chamber 23 and the outlet-side header chamber 24 in a state of partitioning them.
Each LNG vaporization heat transfer tube 22 is U-shaped, and each LNG vaporization heat transfer tube 22 has one end communicating with the inlet side header chamber 23 and the other end communicating with the outlet side header chamber 24. Are supported by the heat transfer tube support plate 26.

Incidentally, an inspection opening F is formed in the central portion of the partition plate 25, and a manway cover body 25A that opens and closes the inspection opening F is provided in a state of being connected and fixed by a fastening bolt.
At the time of inspection and adjustment, the manway cover body 25A is removed so that the inlet-side header chamber 23 and the outlet-side header chamber 24 are switched to a state where they are communicated with each other through the inspection opening F.

  In the inlet-side header chamber 23, a cylindrical inlet connecting portion 23A (see FIG. 9) for connecting the liquefied natural gas supply path 5 for supplying liquefied natural gas (LNG) is projected in a lateral direction. The outlet-side header chamber 24 is provided with a cylindrical outlet connecting portion 24A for connecting the natural gas delivery path 6 for discharging the vaporized natural gas (NG) in a posture protruding upward. It has been.

(Connection configuration between the intermediate heat medium vaporizer 10 and the LNG vaporizer 20)
As shown in FIG. 1, in order to circulate propane gas (PG) and liquefied petroleum gas (LPG) between the intermediate heat medium vaporizer 10 and the LNG vaporizer 20, heat transfer is performed. The LPG vaporization shell 11 of the vaporizer 10 and the LNG vaporization shell 21 of the LNG vaporizer 20 are connected by a heat medium circulation path 7 including an outward path 7f and a return path 7r.

  Specifically, the gas phase portion above the LPG vaporization shell 11 of the intermediate heat medium vaporizer 10 and the gas phase portion above the LNG vaporization shell 21 of the LNG vaporizer 20 are connected to the intermediate heat medium vaporizer 10. Are connected by a forward path 7f for sending propane gas PG from the LNG vaporizer 20 to the LNG vaporizer 20, and below the liquid reservoir portion of the LNG vaporization shell 21 of the LNG vaporizer 20 and above the LPG vaporization shell 11 of the intermediate heat medium vaporizer 10. Are connected by a return path 7r for returning the liquefied petroleum gas LPG from the LNG vaporizer 20 to the intermediate heat medium vaporizer 10.

(Operation of liquefied natural gas vaporizer)
Next, the operation of the liquefied natural gas vaporizer configured as described above will be described.
Seawater SW is supplied to the intermediate heat medium vaporizer 10 through the seawater supply path 2 by the seawater pump 4, and the seawater SW flows into each LPG vaporization heat transfer tube 12 through the seawater inflow chamber 13 and is used for vaporizing each LPG. The heat transfer pipe 12 flows and is discharged to the outside through the seawater discharge passage 3 through the seawater outflow chamber 14.
Then, the liquefied petroleum gas (LPG) accumulated in the LPG vaporizing shell 11 of the intermediate heat medium vaporizer 10 is heated by the seawater SW flowing through each LPG vaporizing heat transfer tube 12, and the liquefied petroleum gas ( A part of LPG) is vaporized, and propane gas (PG) is filled in the LPG vaporization shell 11.

Propane gas (PG) inside the LPG vaporization shell 11 of the intermediate heat medium vaporizer 10 flows into the LNG vaporization shell 21 of the LNG vaporizer 20 through the forward path 7 f of the heat medium circulation path 7.
The liquefied natural gas (LNG) is supplied to the LNG vaporizer 20 through the liquefied natural gas supply path 5, and the liquefied natural gas (LNG) flows into each LNG vaporization heat transfer tube 22 through the inlet side header chamber 23. Then, each LNG vaporization heat transfer tube 22 is passed through.

  Then, heat exchange is performed between the liquefied natural gas (LNG) flowing through the LNG vaporization heat transfer tube 22 and the propane gas (PG) in the LNG vaporization shell 21, and the propane gas (PG) is condensed and Liquefied natural gas (LNG) is heated and vaporized by sensible heat and condensation latent heat of propane gas PG, and the vaporized natural gas (NG) is sent to the natural gas delivery path 6 via the outlet side header chamber 24 and condensed. The liquefied petroleum gas (LPG) collected in the liquid reservoir of the LNG vaporization shell 21.

  The liquefied petroleum gas (LPG) accumulated in the liquid reservoir portion of the LNG vaporization shell 21 of the LNG vaporizer 20 is returned into the LPG vaporization shell 11 of the intermediate heat medium vaporizer 10 through the return path 7r of the heat medium circulation path 7. It is.

(Temperature measurement method in heat transfer tube)
Next, a method for measuring the internal temperature of the heat transfer tube 22 for LNG vaporization (hereinafter, abbreviated as a temperature measurement method) will be described with respect to a method for measuring the temperature in the heat transfer tube, with the LNG vaporizer 20 as a measurement target.
In this temperature measurement method, as shown in FIG. 7, a plurality of (for example, six) thermocouple wires 31 having different temperature measurement points P along the longitudinal direction of the protective tube 30 are placed inside the protective tube 30. Specifically, for example, by using six sheathed thermocouples N, the LNG vaporization heat transfer tube 22 having excellent heat transfer performance and the normal heat transfer performance are used. Although the internal temperature with the LNG vaporization heat transfer tube 22 is measured, in the following description, in order to make the explanation easy to understand, the inside of one LNG vaporization heat transfer tube 22 with one sheath thermocouple N is used. It is assumed that the temperature is to be measured.

Incidentally, each of the plurality of thermocouple wires 31 inserted into the protective tube 30 has a plurality of different positions along the longitudinal direction of the protective tube 30 due to different lengths along the longitudinal direction of the protective tube 30. The temperature at the temperature measurement point P is measured.
Further, as is well known, each of the plurality of thermocouple wires 31 is configured as a pair of two wires, and each of the plurality of thermocouple wires 31 is shown in FIG. As described above, the compensating lead wire 31A is connected.
The inner diameter of the heat transfer tube 22 for LNG vaporization is about 13 mm, and the outer diameter of the sheath thermocouple N is about 3.2 mm.

In this temperature measurement method, as shown in FIG. 12, the sheath thermocouple N is inserted from the opening end of the inlet-side header chamber 23 to the opening end of the outlet-side header chamber 24 in the LNG vaporization heat transfer tube 22. In this state, the temperature at a plurality of locations in the longitudinal direction inside the heat transfer tube 22 for LNG vaporization is measured by the sheath thermocouple N.
Incidentally, when measuring the temperature with the sheath thermocouple N, a measuring instrument (for example, a data logger) is connected to the sheath thermocouple N.

The installation form of the sheath thermocouple N will be described.
As shown in FIG. 3, the inlet-side header chamber 23 is provided with an insertion cylinder portion 32 through which the sheath thermocouple N is inserted over the inside and outside of the inlet-side header chamber 23.
Further, the cylindrical holding frame 33 through which the sheath thermocouple N is inserted has a holding frame side flange portion 33F provided at the end portion on the existence side of the inlet side header chamber 23, and a cylindrical portion side flange portion at the tip of the insertion cylinder portion 32. It is provided in a state connected to 32F. That is, the holding frame side flange portion 33F and the cylinder portion side flange portion 32F are fastened and fixed using the fixing bolt 34 and the nut 35 with the sealing material interposed therebetween.

  Then, the sheath thermocouple N is installed in a form to be inserted into the LNG vaporization heat transfer tube 22 via the holding frame 33, the insertion cylinder portion 32, and the inlet-side header chamber 23. The sealing frame M is configured to be attached to the holding frame 33 to hold the sheath thermocouple N in a sealed state.

  When the seal portion M is described, as shown in FIG. 4, the cylindrical main body portion 36 that is screwed to the distal end portion of the holding frame 33 and the seal mounting cylindrical portion 36 </ b> A of the cylindrical main body portion 36 are held inside. The sealing action part 37 fitted in a state where the movement toward the frame side (the side approaching the holding frame 33) is restricted and the cylindrical main body part 36 (the approaching to the holding frame 33) The seal portion M is constituted by a bag-like nut 38 that is screwed so as to move to the side) and pushes and moves the seal action portion 37 to the holding frame side (side approaching the holding frame 33).

  Then, the sealing portion 37 has a follower portion 37A through which the sheath thermocouple N penetrates and is pressed by the bag-like nut 38, and the sheath thermocouple N penetrates and movement to the holding frame is restricted. The sheet portion 37B and a sealant 37C that penetrates the sheath thermocouple N and is elastically deformed by being sandwiched between the follower portion 37A and the sheet portion 37B.

Further, as shown in FIGS. 5 and 6, the sheet portion 37B is formed in a state where the sheath thermocouple N is divided in the circumferential direction in a form in which the penetration portion is separated, specifically, in a state where the sheet portion 37B is divided in four in the circumferential direction. Similarly, although not shown, each of the follower portion 37A and the sealant 37C is formed in a state of being divided into four in the circumferential direction.
That is, by forming the sheet portion 37B in a state where the sheath thermocouple N is divided in the circumferential direction so as to separate the penetrating portion, as shown in FIG. 5, the sheath thermocouple is inserted through the cylindrical main body portion 36. The pair N can be installed in a state of being sandwiched between the adjacent divided portions B of the sheet portion 37B.
A concave groove U into which the sheath thermocouple N is fitted is formed on the surface of the divided portion B in the sheet portion 37B facing the circumferential direction.

  Although illustration is omitted, the follower part 37A and the sealant 37C can also be installed in a state where the sheath thermocouple N is sandwiched between the divided parts, similarly to the sheet part 37B, and the follower part 37A and the sealant 37C are separated. A concave groove into which the sheath thermocouple N is fitted is formed on the surface facing the circumferential direction, similarly to the divided portion B of the sheet portion 37B.

Further, in the present embodiment, as shown in FIG. 7, a contact prevention annular portion K having a diameter larger than that of the sheath thermocouple N is formed on the outer surface portion of the sheath thermocouple N corresponding to the temperature measurement point P. It is provided and the location corresponding to the temperature measurement point P in the sheath thermocouple N is prevented from contacting the inner surface of the LNG vaporization heat transfer tube 22.
The outer diameter of the contact preventing annular portion K is about 5 mm.

  Further, as shown in FIG. 7, the distal end portion of the sheathed thermocouple N is provided at the distal end portion of the sheathed thermocouple N in a state in which linear elastic bodies D positioned on the outer side are arranged in the circumferential direction. Is prevented from contacting the inner surface of the heat transfer tube 22 for LNG vaporization.

Incidentally, the linear elastic body D is connected to the tip portion of the sheath thermocouple N by solder or the like, and when performing the operation of installing the sheath thermocouple N as will be described later, as shown in FIG. A hook-shaped crimp terminal 40 that is held in a state that does not spread outward by a tube 39 made of a product and that functions as a connector is attached to the tip.
Then, during the operation of installing the sheath thermocouple N, as will be described later, the tube 39 made of Teflon and the linear elastic body D are cut at the cutting position EC, and the hook-shaped crimp terminal 40 is cut off, and By removing the tube 39 made of Teflon, the linear elastic body D is elastically returned to the position positioned on the outer side toward the distal end side.

(Sheath thermocouple installation procedure)
Next, the procedure for installing the sheath thermocouple N using the tow cord J will be described with reference to FIGS.
9 to 12 show the inlet connecting portion 23A and the insertion cylinder portion 32 in a posture projecting to the lateral side of the inlet-side header chamber 23 in a posture projecting downward from the inlet-side header chamber 23. It is the figure described as.
Further, when installing the sheath thermocouple N, in this embodiment, the manway cover body 25A is removed and the inspection opening F is kept open, and the cylindrical main body portion of the seal portion M is maintained. 36 is attached to the holding frame 33 in advance.

The tow rope J is composed of a wire or the like. First, as shown in FIG. 9, the tow rope J is placed in the outlet-side header chamber 24 of the LNG vaporization heat transfer tube 22. Insert from the open end. Then, the LNG vaporization heat transfer tube is arranged so that one end portion of the tow cord J projects from the opening end portion of the outlet header chamber 24 in the LNG vaporization heat transfer tube 22 and the other end portion projects from the holding frame 33. 22, the inlet side header chamber 23, the insertion cylinder portion 32, and the holding frame 33 are installed in a form to be inserted.
Incidentally, in the present embodiment, a portion of the traction cable J that protrudes from the opening end of the outlet side header chamber 24 of the LNG vaporization heat transfer tube 22 passes through the inspection opening F and the inlet connecting portion 23A to the inlet side. It protrudes outward from the header chamber 23.

  In this embodiment, the tow cord J is inserted from the opening end of the outlet side header chamber 24 of the LNG vaporization heat transfer tube 22, but the inlet side header of the LNG vaporization heat transfer tube 22 is used. You may make it insert from the opening edge part of the chamber 23. FIG.

Next, the other end portion protruding from the holding frame 33 in the traction cord J and the distal end portion of the sheath thermocouple N are connected. That is, the crimp terminal 40 at the distal end portion of the sheath thermocouple N is connected (coupled) to the other end portion protruding from the holding frame 33 in the pulling cord J. Note that a vinyl tape or a gummed tape is wound around the connecting portion between the tow cord J and the crimp terminal 40 to ensure the connection between the two.
In addition, before connecting the front-end | tip part of the sheath thermocouple N to the other end part which protrudes from the holding frame 33 in the cable body J for towing, the bag-shaped nut 38 of the seal | sticker part M is inserted in the sheath thermocouple N. Like that.

Thereafter, as shown in FIG. 10, the sheath thermocouple N is LNG vaporized by pulling one end portion protruding from the opening end portion of the outlet side header chamber 24 of the LNG vaporizing heat transfer tube 22 in the traction cord J. The heat transfer tube 22 is drawn and moved, and the drawing movement is performed until the distal end portion of the sheath thermocouple N protrudes from the opening end portion of the outlet header chamber 24 as shown in FIG.
Incidentally, when the sheath thermocouple N is drawn into the LNG vaporization heat transfer tube 22 and moved, the sheath thermocouple N is held so as to avoid bending of the sheath thermocouple N.

  Subsequently, by cutting the Teflon tube 39 and the linear elastic body D at the cutting position EC, the connection between the other end of the traction cord J and the distal end of the sheath thermocouple N is released. And after removing the tube 39 made of Teflon, as shown in FIG. 12, the distal end portion of the sheath thermocouple N is moved to the LNG by pulling the proximal end portion located outside the holding frame 33 in the sheath thermocouple N. It adjusts to the installation state located in the predetermined position inside the heat exchanger tube 22 for vaporization.

  Incidentally, in this embodiment, since six sheathed thermocouples N are installed in different LNG vaporization heat transfer tubes 22, the above-described installation operation is repeated for the six sheathed thermocouples N. Thus, the six sheathed thermocouples N are installed in different LNG vaporization heat transfer tubes 22.

Thereafter, the seal portion M is attached to the holding frame 33. That is, the sheet portion 37B, the sealant 37C, and the follower portion 37A are inserted into the cylindrical main body portion 36 attached to the holding frame 33. At this time, each of the sheet portion 37B, the sealant 37C, and the follower portion 37A is replaced with 6 It inserts so that it may be in the state which clamps the sheath thermocouple N of a book.
Subsequently, the bag-shaped nut 38 is fastened to the cylindrical main body portion 36, the sealant 37C is sandwiched between the follower portion 37A and the seat portion 37B, and the sealant 37C is bulged and deformed radially outward to be sealed The part M is brought into a sealing action state.

(Evaluation of seal performance of seal part)
Next, an evaluation apparatus H that evaluates the sealing performance of the seal portion M will be described.
As shown in FIG. 13, this evaluation apparatus H is provided with an inspection flange portion 42 for connecting the holding frame side flange portion 33F of the holding frame 33 by bolting inside an inspection container 41 for storing liquid nitrogen. A gas supply pipe 43 that supplies helium gas (He) as an inspection gas in a high pressure state is connected to the inspection flange portion 42.

The holding frame 33 is provided with an inspection member NT having the same configuration as that of the sheath thermocouple N and sealed by a seal portion M.
In addition, a collection case 44 that collects helium gas (He) leaking from the seal portion M in a state of covering the upper portion of the holding frame 33 is provided on the upper portion of the holding frame 33.
The collection case 44 is filled with nitrogen gas supplied from the supply nozzle 45 and discharged from the discharge nozzle 46.

  A gas detector 47 for detecting whether or not helium gas (He) is mixed in the nitrogen gas discharged from the discharge nozzle 46 is provided. When the gas detector 47 detects helium gas (He). Therefore, it is determined that the seal part M is leaking.

  As a result of evaluating the sealing performance of the seal portion M with the evaluation apparatus H having the above configuration, it was confirmed that the seal portion M of the present embodiment was excellent in seal performance.

[Another embodiment]
Hereinafter, other embodiments are listed.
(1) In the above embodiment, the LNG vaporizer 20 is a liquefied natural gas vaporizer configured as a separate body from the intermediate heat medium vaporizer 10, but the LPG vaporization shell of the intermediate heat medium vaporizer 10 is exemplified. 11 and the LNG vaporization shell 21 of the LNG vaporizer 20 can be applied to a liquefied natural gas vaporization apparatus in which the LNG vaporization shell 21 is configured as one shell.

(2) In the above embodiment, the case where the LNG vaporization heat transfer tube 22 having excellent heat transfer performance and the LNG vaporization heat transfer tube 22 having normal heat transfer performance are provided as the LNG vaporization heat transfer tube 22 will be described. However, the temperature measurement method of the present invention can also be applied to the LNG vaporizer 20 including the LNG vaporization heat transfer tube 22 having the same heat transfer performance.

(3) In the above-described embodiment, the seal portion M is exemplified as having the sheet portion 37B, the sealant 37C, and the follower portion 37A. However, the specific configuration of the seal portion M can be variously changed.

(4) In the above embodiment, as the sheathed thermocouple N, six thermocouple strands 31 having different temperature measurement points P in the longitudinal direction of the protective tube 30 are inserted into the protective tube 30 to provide six sheath thermocouples N. However, the number of temperature measurement points P measured by the sheath thermocouple N can be variously changed. Alternatively, one thermocouple wire 31 may be inserted into the protective tube 30 to measure the temperature at one location.

(5) In the above embodiment, the temperature measurement method in the heat transfer tube is exemplified for the LNG vaporizer 20 including the LNG vaporization heat transfer tube 22 as the heat transfer tube. The method for measuring the temperature in the heat pipe can be widely applied to devices including heat transfer tubes connected to the inlet side header chamber and the outlet side header chamber, that is, devices using a shell-and-tube heat exchanger.

  The configuration disclosed in the above embodiment (including another embodiment, the same shall apply hereinafter) can be applied in combination with the configuration disclosed in the other embodiment, as long as no contradiction occurs. The embodiment disclosed in this specification is an exemplification, and the embodiment of the present invention is not limited to this, and can be appropriately modified without departing from the object of the present invention.

21 Heating chamber 22 Heat transfer tube 23 Inlet side header chamber 24 Outlet side header chamber 30 Protective tube 31 Thermocouple wire 32 Insertion tube portion 32A Tube portion side flange portion 33 Holding frame 33A Holding frame side flange portion D Elastic body J For pulling Cord-like body K Contact prevention annular part M Seal part N Sheath thermocouple

Claims (6)

The inlet side header chamber and the outlet side header chamber are connected by a heat transfer tube,
The heat transfer tube is a temperature measurement method in a heat transfer tube disposed inside a heating chamber in which a heating fluid flows,
A single thermocouple wire or a sheath thermocouple in which a plurality of thermocouple wires having different temperature measurement points along the longitudinal direction of the protective tube are inserted into the protective tube, the inlet-side header in the heat transfer tube In a heat transfer tube that measures the temperature of one or a plurality of locations in the longitudinal direction inside the heat transfer tube with the sheath thermocouple while being inserted from the open end of the chamber toward the open end of the outlet header chamber Temperature measurement method. The inlet side header chamber is provided with an insertion tube portion for inserting the sheath thermocouple through the inside and outside of the inlet side header chamber,
The cylindrical holding frame through which the sheath thermocouple is inserted is a state in which the holding frame side flange portion provided at the end portion on the existence side of the inlet side header chamber is connected to the cylinder side flange portion at the tip of the insertion cylinder portion Provided in
The sheath thermocouple is installed in a form to be inserted into the heat transfer tube via the holding frame, the insertion cylinder and the inlet header chamber, and then the sheath thermocouple is attached to the holding frame. The method for measuring a temperature in a heat transfer tube according to claim 1, wherein a seal portion that holds the tube in a sealed state is attached. In the state where one end part protrudes from the opening end part of the outlet side header chamber in the heat transfer tube and the other end part protrudes from the holding frame, the heat transfer tube, the inlet side header chamber, Installed in a form to insert the insertion cylinder and the holding frame,
Next, by connecting the other end of the traction cord and the tip of the sheath thermocouple, and pulling the one end of the traction cord, the sheath thermocouple is Move until the tip protrudes from the open end of the outlet header chamber,
Next, after releasing the connection between the other end portion of the pulling cord and the distal end portion of the sheath thermocouple, the proximal end portion of the sheath thermocouple located outside the holding frame is pulled. By adjusting the distal end portion of the sheath thermocouple to a predetermined position inside the heat transfer tube,
Then, the temperature measurement method in the heat exchanger tube according to claim 2, wherein the seal portion is attached to the holding frame.   The temperature measurement method in the heat exchanger tube of any one of Claims 1-3 in which the said sheath thermocouple is provided with two or more with the form inserted in the said different heat exchanger tube.   5. The contact prevention annular portion having a larger diameter than that of the sheath thermocouple is provided on an outer surface portion of the sheath thermocouple corresponding to the temperature measurement point. 6. Temperature measurement method inside heat transfer tubes.   The inside of the heat transfer tube according to any one of Claims 1 to 5, wherein a linear elastic body located on the outer side toward the distal end side is arranged in a circumferential direction at the distal end portion of the sheath thermocouple. Temperature measurement method.

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