JP6433799B2 - Liquid adjustment method for heat exchange of vaporizer and water level measurement unit - Google Patents

Description

  The present invention relates to a heat exchange liquid adjustment method for a vaporizer and a water level measurement unit.

  Conventionally, a vaporizer for vaporizing a low-temperature liquefied gas such as liquefied natural gas is known. As an example of such a vaporizer, Patent Document 1 discloses a plurality of heat exchange panels in which a large number of heat transfer tubes are connected in a panel shape, and a liquefied natural product connected to each heat exchange panel and connected to the bottom of each heat exchange panel. An open rack type vaporizer comprising a lower header through which gas flows and a plurality of troughs arranged on both sides of the upper part of each heat exchange panel and supplying seawater as a heat medium to the outer surface of the heat exchange panel is described ing. In the open rack type vaporizer of Patent Document 1, liquefied natural gas is supplied to the lower header, and seawater is supplied from each trough to the outer surface of each heat exchange panel. Thereby, heat exchange is performed between the liquefied natural gas passing through the heat transfer tube and the seawater flowing along the outer surface of the heat transfer tube. And the liquefied natural gas which passes the inside of a heat exchanger tube vaporizes, and the said vaporized liquefied natural gas is taken out from the uppermost part of each heat exchanger tube as a natural gas.

JP 2010-38363 A

  In the open rack type vaporizer of Patent Document 1, if the flow rate of seawater supplied from each trough to the outer surface of each heat exchange panel varies, the vaporization performance of liquefied natural gas in each heat exchange panel varies. If the vaporization performance of liquefied natural gas in each heat exchange panel varies, it may be difficult to stably supply natural gas in the open rack type vaporizer. As a method of suppressing variation in the vaporization performance of liquefied natural gas in each heat exchange panel, a method of adjusting the flow rate while measuring the flow rate of seawater supplied to the trough using a flow meter or the like can be considered. However, with such a method, it is difficult to accurately adjust the flow rate of seawater supplied from each trough to each heat exchange panel. For this reason, it is difficult to accurately suppress variation in the vaporization performance of liquefied natural gas in each heat exchange panel.

  The present invention has been made from the above viewpoint, and it is an object of the present invention to provide a heat exchange liquid adjustment method for a vaporizer and a water level measurement unit capable of accurately suppressing variations in vaporization performance.

  The liquid exchange method for heat exchange of a vaporizer according to the present invention includes a plurality of vaporization tube panels configured by arranging a plurality of vaporization tubes into which a liquid liquefied gas is introduced, and the heat exchange liquid is introduced. A trough body arranged along each of the vaporization tube panels so as to extend in a direction in which a plurality of vaporization tubes are arranged, and a trough edge extending from one end of the trough body located on the vaporization tube panel side to the vaporization tube panel side A liquid exchange method for heat exchange of a vaporizer comprising a plurality of troughs, a measurement step of measuring a water level of the heat exchange liquid in each trough, and the troughs measured in the measurement step When the difference between the water levels in each trough is out of a predetermined range in the comparison step for comparing the water levels and in the comparison step, the difference is the predetermined Including the adjustment step of adjusting the flow rate of the liquid for the heat exchange with respect to the trough body of each trough to fit in 囲内, the.

  In the heat exchange liquid adjustment method of the vaporizer, the flow rate of the heat exchange liquid to each trough is adjusted so that the water levels of the heat exchange liquid in each trough are within a predetermined range. As a result, the flow rate of the heat exchange liquid from each trough to each vaporization tube panel can be leveled, and variations in the vaporization performance of the liquefied gas in each vaporization tube panel can be accurately suppressed.

  In the measurement step, it is preferable that the water level of the heat exchange liquid flowing on the trough edge of each trough is measured.

  The heat exchange liquid introduced into the trough body flows out on the trough edge along the surface of the trough edge toward the vaporizing tube panel. For this reason, the possibility that the water surface of the heat exchange liquid undulates on the trough edge is low. In the heat exchange liquid adjustment method of the vaporizer, the water level of the heat exchange liquid is measured on the trough edge where the water surface of the heat exchange liquid is less likely to wave, so that the water level can be accurately measured. .

  Further, in the measurement step, the water level of the heat exchange liquid flowing on the trough edge at each of a plurality of locations in the length direction of the troughs is measured, and in the comparison step, the respective levels measured in the measurement step are measured. The average value of the water level at each of the plurality of locations of the trough is calculated, the average values of the troughs are compared with each other, and in the adjustment step, the difference between the average values of the troughs in the comparison step. Is outside the predetermined range, it is preferable to adjust the flow rate of the heat exchange liquid with respect to the trough body of each trough so that the difference falls within the predetermined range.

  In the above heat exchange liquid adjustment method for a vaporizer, each vaporization tube is obtained from each trough by calculating the average value of the water level of the heat exchange liquid flowing through the trough edge at each of a plurality of locations in the length direction of each trough. The flow rate of the heat exchange liquid to the panel can be accurately estimated. Then, by adjusting the flow rate of the heat exchange liquid to each trough so that the average values in each trough are within a predetermined range, the variation in the vaporization performance of the liquefied gas in each vaporization tube panel can be more accurately performed. Can be suppressed.

  Further, in the measurement step, it is preferable to measure the water level in each trough using a distance meter that is arranged on the trough edge and can measure a distance between two points without contact with the trough edge. .

  In the above-described heat exchange liquid adjustment method for the vaporizer, the water level of the heat exchange liquid flowing on the trough edge can be easily measured even when the vaporizer is disposed in a relatively narrow space. In order to measure the water level of the heat exchange liquid flowing on the trough edge, for example, the straight scale is inserted from the upper side of the trough edge, the front end of the straight scale is brought into contact with the trough edge, and the scale attached to the straight scale is directly read. A method for measuring the water level can be considered. However, when the vaporizer is disposed in a relatively narrow space, it is difficult to insert the straight scale from above the trough edge, and it is difficult to directly read the scale on the straight scale in the narrow space. Therefore, in the above-described liquid adjustment method for heat exchange of the vaporizer, since the distance meter capable of measuring the distance between two points without contact with the trough edge is disposed on the trough edge, the vaporizer has a relatively narrow space. Measurement can be easily performed even in the case of being arranged in the position.

  The water level measurement unit according to the present invention includes a vaporization tube panel configured by arranging a plurality of vaporization tubes into which liquid liquefied gas is introduced, and a direction in which the plurality of vaporization tubes are arranged while introducing a heat exchange liquid. In a vaporizer comprising: a trough body arranged along the vaporization tube panel so as to extend; and a trough having a trough edge extending from one end located on the vaporization tube panel side to the vaporization tube panel side of the trough body. A water level measuring unit for measuring the water level of the heat exchange liquid in the trough, a table-like member disposed on the trough edge, a distance meter supported by the table-like member and measuring the water level, Is provided.

  In the above water level measuring unit, a water level of the heat exchange fluid in the trough can be measured by arranging a base member on the trough edge and supporting the distance meter on the base member.

  Moreover, it is preferable that the said base-like member has a pair of leg part arrange | positioned on the said trough edge, and the base part currently spanned by the said pair of leg part and supporting the said distance meter.

  In the above water level measurement unit, the platform spanned by the pair of legs supports the distance meter so that the distance meter contacts the heat exchange fluid flowing on the trough edge below the platform. Can be suppressed.

Further, the pair of legs, the are from the upper end of the trough body has a recess recessed in the range over the Torafue' di, the upper edge of the upper end and the Torafuejji the recess portion of the side wall of the trough body It is preferable that it is arranged on the trough edge so as to contact.

  In the above-described water level measurement unit, the pair of legs are arranged so that the depressions are in contact with the outer edge of the trough edge, so that the trapezoidal member can be stably arranged on the trough edge.

  ADVANTAGE OF THE INVENTION According to this invention, the liquid adjustment method for heat exchange of the vaporizer which can suppress the dispersion | variation in vaporization performance accurately, and a water level measurement unit are provided.

It is a schematic block diagram of the vaporization apparatus which concerns on this embodiment, a water level measurement unit, and a control apparatus, Comprising: It is the figure seen from the direction orthogonal to the direction where a vaporization pipe | tube is located in a line. It is a schematic block diagram of the vaporization apparatus which concerns on this embodiment, a water level measurement unit, and a control apparatus, Comprising: It is the figure seen from the direction in which vaporization pipes are located in a line. It is a schematic perspective view which shows the principal part of the vaporization apparatus and water level measurement unit which concern on this embodiment. It is a schematic perspective view which shows the principal part of the water level measurement unit which concerns on this embodiment. It is a flowchart which shows the dispersion | distribution adjustment method of the seawater with respect to each trough. It is sectional drawing which shows the modification of the water level measurement unit which concerns on this embodiment.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. However, for convenience of explanation, the drawings referred to below show simplified main members necessary for explaining the present embodiment among the constituent members of the embodiment of the present invention.

  1 and 2 show a vaporizer X1 that vaporizes liquid liquefied gas. The vaporizer X1 includes a vaporizer panel 2, a trough 3, a seawater inflow pipe 4, and a dispersion valve 5.

  The vaporization tube panel 2 is a panel that performs heat exchange between the liquid low-temperature liquefied gas and the heat exchange liquid. The vaporization tube panel 2 includes a large number of vaporization tube panels arranged so that their outer surfaces face each other. FIG. 2 shows the first vaporization tube panel 2a and the second vaporization tube panel among the many vaporization tube panels. Only 2b is shown.

  The vaporization tube panel 2 includes a plurality of vaporization tubes 21, a lower header 22, and an upper header 23. The plurality of vaporizing tubes 21 extend in the vertical direction and are arranged in one direction. The lower header 22 extends in one direction in which a plurality of vaporization tubes 21 are arranged, and is connected to the lower end of each vaporization tube 21. The upper header 23 extends in one direction in which a plurality of vaporization tubes 21 are arranged, and is connected to the upper end of each vaporization tube 21. The first vaporization tube panel 2a and the second vaporization tube panel 2b are arranged in a direction orthogonal to the one direction in which the plurality of vaporization tubes 21 are arranged.

  In the present embodiment, liquefied natural gas (LNG) is introduced into the lower header 22 of the vaporization tube panel 2 as a liquid low-temperature liquefied gas. The LNG introduced into the lower header 22 is introduced into each vaporization tube 21 from the lower end of each vaporization tube 21. In each vaporization tube 21, heat exchange is performed between the LNG introduced into each vaporization tube 21 and the heat exchange liquid flowing on the outer surface of each vaporization tube 21, thereby vaporizing LNG. Natural gas (NG). NG in which LNG is vaporized in this way flows from the upper end of each vaporizing tube 21 to the upper header 23 and is taken out from the upper header 23. The low-temperature liquefied gas introduced into the vaporizing tube panel 2 is not limited to LNG, and may be, for example, liquefied petroleum gas or liquid nitrogen.

  The trough 3 has a role of supplying a heat exchange liquid to the outer surface of each vaporizing tube 21. In the present embodiment, seawater is used as the heat exchange liquid. The heat exchange liquid does not have to be seawater, but may be any liquid that can vaporize a liquid liquefied gas by heat exchange.

  The trough 3 extends in the direction in which the plurality of vaporizing tubes 21 are arranged, and includes at least a first trough 3a, a second trough 3b, and a third trough 3c. The 1st trough 3a is arrange | positioned along the outer surface on the opposite side of the 2nd vaporization pipe panel 2b among the 1st vaporization pipe panels 2a. The 2nd trough 3b is arrange | positioned so that it may extend along the outer surface of the said vaporization pipe panel 2a, 2b between the 1st vaporization pipe panel 2a and the 2nd vaporization pipe panel 2b. The 3rd trough 3c is arrange | positioned along the outer surface on the opposite side of the 1st vaporization pipe panel 2a among the 2nd vaporization pipe panels 2b. Each trough 3a-3c is provided in the upper end side of each vaporization pipe | tube 21. As shown in FIG. In this embodiment, an example in which the vaporizer X1 includes three troughs 3a to 3c will be described. However, the number of troughs 3 can be appropriately changed according to the number of vaporization tube panels 2.

  The seawater inflow pipe 4 is a pipe for introducing seawater into the troughs 3a to 3c. The seawater inflow pipe 4 has a main pipe 41 into which seawater flows and a branch pipe 42 that branches from the main pipe 41 and introduces the seawater that has flowed into the main pipe 41 into the troughs 3a to 3c. . The branch pipe 42 includes a first branch pipe 42a connected to the first trough 3a, a second branch pipe 42b connected to the second trough 3b, a third branch pipe 43c connected to the third trough 3c, Is included. In this embodiment, each branch pipe 42a-42c introduces seawater into the said trough main body 31 by being connected to the lower surface of each trough 3a-3c. In addition, each branch pipe 42a-42c may be comprised so that seawater may be introduce | transduced into each said trough 3a-3c from the upper direction of each trough 3a-3c.

  The dispersion valve 5 is a valve that adjusts the flow rate of seawater introduced from the branch pipes 42a to 42c into the troughs 3a to 3c. The dispersion valve 5 includes a first dispersion valve 5a provided in the first branch pipe 42a, a second dispersion valve 5b provided in the second branch pipe 42b, and a third dispersion valve provided in the third branch pipe 43c. 5c. In the vaporizer X1, the flow rate of seawater introduced into the troughs 3a to 3c is adjusted by changing the opening degree of the dispersion valves 5a to 5c, and thereby supplied to the outer side surfaces of the vaporizer tube panels 2a and 2b. The flow of seawater can be adjusted.

  Here, the trough 3 has a trough main body 31 and a trough edge 32.

  Seawater is introduced into the trough body 31 from the seawater inflow pipe 4. The trough body 31 has a concave shape that is recessed downward. Thereby, seawater introduced into the trough body 31 is temporarily stored in the trough body 31.

  The trough edge 32 extends from the upper end of the side wall of the trough body 31 on the vaporizing tube panel 2 side to the vaporizing tube panel 2 side. Specifically, the trough edge 32 in the first trough 3a extends from the upper end of the side wall of the trough body 31 on the first vaporizing tube panel 2a side so as to incline downward toward the first vaporizing tube panel 2a side. Yes. The trough edge 32 in the second trough 3b extends from the upper end of the side wall of the trough body 31 on the first vaporization tube panel 2a side so as to incline downward toward the first vaporization tube panel 2a side. 31 extends from the upper end of the side wall on the second vaporization tube panel 2b side so as to incline downward toward the second vaporization tube panel 2b side. The trough edge 32 in the third trough 3c extends from the upper end of the side wall of the trough body 31 on the second vaporizing tube panel 2b side so as to incline downward toward the second vaporizing tube panel 2b side.

  Seawater introduced into the trough body 31 of each of the troughs 3a to 3c flows along the surface of the trough edge 32 on the trough edge 32, and flows down to the outer surface of the vaporizing tube panels 2a and 2b. Thereby, seawater is supplied to the outer surface of each vaporization pipe | tube 21, and heat exchange is performed between LNG and seawater in the said vaporization pipe | tube 21 concerned. In the present embodiment, the side wall of the trough body 31 of the first trough 3a opposite to the first vaporizing tube panel 2a is set higher than the side wall on the first vaporizing tube panel 2a side. Moreover, the side wall on the opposite side to the 2nd vaporization pipe panel 2b among the trough main bodies 31 of the 3rd trough 3c is set higher than the side wall by the side of the 2nd vaporization pipe panel 2b.

  On the trough edge 32 of each trough 3a-3c in the vaporizer X1, the water level measurement unit Y1 is provided. In the first trough 3a, a plurality of (three in the illustrated example) water level measuring unit Y1 is provided on the trough edge 32 extending toward the first vaporizing tube panel 2a. In the third trough 3c, the second vaporizing tube is provided. A plurality (three in the illustrated example) of water level measurement units Y1 are provided on the trough edge 32 extending toward the panel 2b. Further, in the second trough 3b, a plurality (three in the illustrated example) of water level measuring units Y1 are disposed on the trough edge 32 extending toward the first vaporizing tube panel 2a and the trough edge 32 extending toward the second vaporizing tube panel 2b. Is provided. Each water level measurement unit Y1 is disposed at three locations of one end 33, the other end 34, and an intermediate portion 35 in the length direction of each trough 3a to 3c. In addition, the number and arrangement | positioning location of the water level measurement unit Y1 provided in each trough 3a-3c are arbitrary, and can be suitably changed according to the usage condition of the vaporizer X1.

  As shown in FIGS. 3 and 4, the water level measurement unit Y <b> 1 has a table-like member 6 and a distance meter 7.

  The base member 6 includes a first leg 61 and a second leg 62 which are a pair of legs, and a base 63.

The 1st leg part 61 and the 2nd leg part 62 have the 1st hollow part 61a and the 2nd hollow part 62a which were formed so that the lower end of the said 1st leg part 61 and the 2nd leg part 62 might be hollow, respectively. . The first dent 61 a and the second dent 62 a are recessed in a range from the upper end of the trough body 31 to the trough edge 32. Specifically, the upper end of the side wall of the trough body 31 is warped outside the trough body 31, and the trough edge 32 is smoothly and continuously inclined to the upper end. Thus, the upper edge of the trough 3 is formed in a curved shape protruding upward from the upper end of the side wall of the trough body 31 toward Torafuejji 32, first recessed portion 61a and the second recess portion 62a is along the curve recess It is. The first leg portion 61 and the second leg portion 62 are arranged such that the first recess portion 61 a and the second recess portion 62 a are in contact with the upper end of the side wall of the trough body 31 and the upper edge of the trough edge 32.

  The base 63 is bridged between the upper end of the first leg 61 and the upper end of the second leg 62. Thereby, the base part 63 is located on the trough edge 32 located between the 1st hollow part 61a and the 2nd hollow part 62a, and the space | gap is provided between the said trough edge 32 and the base part 63. Yes. The platform 63 has a rectangular shape extending in the length direction of the trough 3. The shape of the pedestal 63 is not limited to a rectangular shape, and can be appropriately changed according to the usage mode of the water level measurement unit Y1.

  The distance meter 7 is supported by the base portion 63 of the base member 6. The distance meter 7 can measure the level of seawater flowing on the trough edge 32 positioned below the distance meter 7 in a non-contact state with respect to the trough edge 32. In the present embodiment, the distance meter 7 is an ultrasonic distance meter capable of measuring a distance between two points with ultrasonic waves. When measuring the water level of seawater with this ultrasonic distance meter, first, the zero point value of the ultrasonic distance meter is measured at the trough edge 32 in a state where seawater is not flowing. Then, the water level of the seawater flowing on the trough edge 32 is measured by subtracting the zero point numerical value from the value measured in a state where the seawater is flowing on the trough edge 32. The distance meter 7 is not limited to an ultrasonic distance meter, and may be an optical distance meter or a laser beam distance meter.

  In the present embodiment, the distance meter 7 of the water level measurement unit Y1 measures the water level of seawater flowing on the trough edge 32, but is not limited to this, and may measure the water level of seawater in the trough body 31. That is, the distance meter 7 of the water level measurement unit Y1 only needs to be able to measure the seawater level at any location of the trough 3.

  For example, when the distance meter 7 measures the water level of seawater in the trough body 31, the trapezoidal member 6 is disposed so as to be bridged between the trough edges 32 of the trough 3 as shown in FIG. 6. Specifically, in FIG. 6, the first leg 61 is disposed on one trough edge 32 and the second leg 62 is disposed on the other trough edge. 31 is located above. And the distance meter 7 supported by the base part 63 measures the water level of the seawater in the trough main body 31 located under the distance meter 7.

  Moreover, in this embodiment, although the water level measurement unit Y1 is separately provided in both the trough edges 32 of the trough 3, it is not restricted to this. For example, the single table-like member 6 may be arranged so as to be bridged between the trough edges 32 of the trough 3, and the distance meter 7 may be individually attached to the portions on the trough edges 32 of the table-like member 6. In such a case, the water level of the seawater flowing on both trough edges 32 of the trough 3 can be measured by the single water level measurement unit Y1 configured by the single platform member 6 and the two distance meters 7. .

  In the present embodiment, the water level measurement unit Y1 is disposed apart from the vaporization tube panels 2a and 2b, but is not limited thereto. For example, the water level measurement unit Y1 may be arranged such that the trapezoidal member 6 leans on the outer surface of each vaporization tube panel 2a, 2b. Thus, the water level measurement unit Y1 can be stably held on the trough edge 32 by placing the base member 6 close to the outer surface of each vaporizing tube panel 2a, 2b.

  Moreover, in this embodiment, in order to measure the water level of the seawater flowing on the trough edge 32, the water level measuring unit Y1 is arranged on the trough edge 32. However, if the water level can be measured by a straight scale, for example, the water level measuring unit Y1 may not be present.

  Further, for example, a rod-shaped member may be attached to the water level measurement unit Y1. By operating the rod-shaped member and moving the water level measurement unit Y1 on the trough edge 32, the water level of seawater at a plurality of locations on the trough edge 32 can be measured by one water level measurement unit Y1.

  Further, the water level measurement unit Y1 may be connected to a data logger. By connecting the water level measurement unit Y1 to the data logger, the measurement value in the water level measurement unit Y1 can be stored.

  Here, in FIG. 1 and FIG. 2, the control which adjusts the opening degree of each dispersion | distribution valve 5a-5c according to the water level of the seawater which flows on the trough edge 32 in each trough 3a-3c measured in the water level measurement unit Y1. The control apparatus Z1 which performs is shown. The control device Z1 includes hardware such as an MPU including a CPU, a ROM, a RAM, and the like (not shown) and an input / output interface with an external device.

  The control device Z1 functionally includes a reception unit 100, an average calculation unit 200, a comparison unit 300, and a dispersion adjustment unit 400. These functions are realized by the above-described various hardware based on software instructions, for example.

  The reception unit 100 receives the measurement value of the sea level of the seawater measured in the water level measurement unit Y1 disposed on the trough edge 32 of each trough 3a to 3c.

  The average calculation unit 200 calculates an average value of the water level of the seawater flowing on the trough edge 32 for each trough 3a to 3c from the measurement value received by the reception unit 100.

  The comparison unit 300 compares the average values of the troughs 3a to 3c calculated by the average calculation unit 200. Specifically, the comparison unit 300 determines whether or not the average value in each of the troughs 3a to 3c is within a predetermined range, and sends the determination result to the dispersion adjustment unit 400.

  The dispersion adjusting unit 400 performs control to adjust the opening degree of each of the dispersion valves 5 a to 5 c according to the determination result received from the comparison unit 300.

  In the present embodiment, the control device Z1 may not be provided, and the function performed by the control device Z1 may be performed manually. In this case, for example, an amplifier is connected to the water level measurement unit Y1, and the measurement value of the water level measurement unit Y1 is displayed on the amplifier. And the user who confirmed the displayed measured value calculates directly the average value of the water level of the seawater which flows on the trough edge 32 of each trough 3a-3c from the said measured value. And the average value in each calculated trough 3a-3c is compared, and the opening degree of each dispersion valve 5a-5c is adjusted manually based on the said comparison result.

  Next, a seawater dispersion adjusting method for the troughs 3a to 3c of the vaporizer X1 will be described with reference to the flowchart of FIG.

1) Measurement process First, when starting the vaporizer X1, the supply of seawater from the branch pipes 42a to 42c to the troughs 3a to 3c is started by opening the dispersion valves 5a to 5c at a predetermined opening degree. . In a state where a certain time has elapsed since the supply of the seawater and seawater is being supplied from the trough edges 32 of the troughs 3a to 3c to the outer side surfaces of the vaporizing tube panels 2a and 2b, the troughs 3a are measured by the water level measuring unit Y1. The water level of the seawater flowing on the trough edge 32 in the one end portion 33, the other end portion 34, and the intermediate portion 35 of ~ 3c is measured (step ST1). Note that the water level of the seawater may be a value measured by the water level measurement unit Y1 at a certain point in time, or may be an average value of values measured by the water level measurement unit Y1 a plurality of times during a certain period. And the water level measurement unit Y1 which measured the water level of seawater sends the said measured value to the reception part 100. FIG.

2) Comparison process The average calculation part 200 calculates the average value of the water level of the seawater which flows on the trough edge 32 in each trough 3a-3c from the measured value in the water level measurement unit Y1 which the reception part 100 received (step ST2). In the present embodiment, the average calculation unit 200 divides the sum of the measurement values in the three water level measurement units Y1 provided in the first trough 3a by 3, thereby flowing the seawater flowing on the trough edge 32 of the first trough 3a. The average value of the water level is calculated. Moreover, the average value of the water level of the seawater flowing on the trough edge 32 of the second trough 3b is calculated by dividing the sum of the measurement values in the six water level measurement units Y1 provided in the second trough 3b by 6. Moreover, the average value of the water level of the seawater flowing on the trough edge 32 of the third trough 3c is calculated by dividing the sum of the measurement values in the three water level measurement units Y1 provided in the third trough 3c by 3.

  The comparison unit 300 compares the average values of the troughs 3a to 3c calculated by the average calculation unit 200, and determines whether or not the difference between the average values is within a predetermined range (step ST3). In the present embodiment, an appropriate numerical range of the water level of the seawater flowing on the trough edges 32 of the troughs 3a to 3c is recorded in the ROM of the control device Z1. And the comparison part 300 determines whether the average value in each trough 3a-3c is settled in the said numerical value range. The appropriate numerical range can be set to a range of ± 10 mm with respect to a numerical value obtained by further averaging the average values of the troughs 3a to 3c, for example. When it is determined that any of the average values in the troughs 3a to 3c is not within the numerical range (NO in step ST3), the comparison unit 300 sends the determination result to the dispersion adjustment unit 400. On the other hand, when it is determined that all the average values in the troughs 3a to 3c are within the numerical range (YES in step ST3), the seawater dispersion adjustment is finished, and the dispersion valves 5a to 5c are opened. The degree is maintained at the opening at the start of activation of the vaporizer X1.

3) Adjustment process The dispersion adjusting unit 400, which is determined to be NO in step ST3 and receives the determination result from the comparison unit 300, performs control to adjust the opening of each of the dispersion valves 5a to 5c based on the determination result, Thereby, the flow volume of the seawater to each trough 3a-3c is adjusted (step ST4). For example, when it is determined in step ST3 that only the average value in the first trough 3a exceeds the numerical range stored in the ROM, the dispersion adjusting unit 400 that has received the determination result determines the first dispersion valve 5a. By controlling the opening, the flow rate of seawater flowing into the first trough 3a is reduced. And after adjusting the flow volume of the seawater to each trough 3a-3c in step ST4, step ST1-ST3 is repeated and the average value in each trough 3a-3c is settled in the said numerical range in step ST3. When the determination is made, the seawater dispersion adjustment is completed. In addition, when adjusting the flow volume of the seawater to each trough 3a-3c without providing the dispersion | distribution adjustment part 400, the average value in each trough 3a-3c calculated in the average calculation part 200 is monitored etc., for example The operator who has displayed and confirmed the display may adjust the opening degree of each of the dispersion valves 5a to 5c. In this case, the operator repeatedly adjusts the opening degree of each of the dispersion valves 5a to 5c until the average value in each trough 3a to 3c displayed on the monitor or the like falls within a predetermined numerical range. The work is finished when it falls within the numerical range.

  Thus, in the seawater dispersion adjusting method of the vaporizer X1, the flow rate of the seawater to each trough 3a-3c is adjusted so that the water levels of the seawater in each trough 3a-3c are within a predetermined range. Thereby, the flow volume of the seawater from each trough 3a-3c to each vaporization pipe panel 2a, 2b is leveled, and the dispersion | variation in the vaporization performance of LNG in each said vaporization pipe panel 2a, 2b can be suppressed accurately.

  Furthermore, in the seawater dispersion adjusting method of the vaporizer X1, the water level of the heat exchange liquid is measured on the trough edge 32 where the water surface of the heat exchange liquid is less likely to wave in the trough 3, so that the water level is accurately measured. can do.

  Furthermore, in the seawater dispersion adjusting method of the vaporizer X1, the average value of the water level of the seawater flowing through the trough edge 32 is calculated at each of a plurality of locations in the length direction of each trough 3a to 3c. Thereby, the flow volume of the seawater from each trough 3a-3c to each vaporization pipe panel 2a, 2b can be estimated accurately. And the dispersion | variation in the vaporization performance of LNG in each vaporization pipe panel 2a, 2b is adjusted by adjusting the flow volume of the seawater to each trough 3a-3c so that the average values in each trough 3a-3c may be settled in the predetermined range. Can be suppressed with higher accuracy.

  Further, in the seawater dispersion adjusting method of the vaporizer X1, the distance meter 7 capable of measuring the distance between two points without contact with the trough edge 32 is disposed on the trough edge 32, and the distance meter 7 uses the distance meter 7 on the trough edge 32. The water level of the seawater flowing through is measured. For this reason, for example, there is no need to insert a straight scale from above the trough edge 32, and there is no need to directly read the scale attached to the straight scale, and thus the vaporizer X1 is disposed in a relatively narrow space. The seawater level on the trough edge 32 can be easily measured.

  Moreover, in the water level measurement unit Y1, the water level of the seawater in the trough 3 can be easily measured by arrange | positioning the base member 6 on the trough edge 32, and making the said base member 6 support the distance meter 7. FIG.

  Furthermore, in the water level measurement unit Y1, the base 63 that is spanned between the first leg 61 and the second leg 62 supports the distance meter 7 so that the distance meter 7 is located below the base 63. Contact with seawater flowing on the trough edge 32 can be prevented.

Further, in the water level measurement unit Y1, the pair of first leg portion 61 and the second leg portion 62 are arranged such that the first recess portion 61a and the second recess portion 62a are in contact with the upper end of the side wall of the trough body 31 and the upper edge of the trough edge 32. By arranging, the base member 6 can be stably arranged on the trough edge 32.

  The present embodiment described above should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiment but by the scope of claims for patent, and further includes meanings equivalent to the scope of claims for patent and all modifications within the scope.

  For example, in the present embodiment, the average calculation unit 200 calculates the average value of the water level of the seawater flowing on the trough edge 32 for each trough 3a to 3c, and compares the average values with each other to provide the seawater to each trough 3a to 3c. However, the flow rate is not limited to this. For example, the flow rate of the seawater to each trough 3a-3c may be adjusted by measuring the water level of the seawater which flows on the trough edge 32 of the intermediate part 35 for every trough 3a-3c, and comparing the said measured value. In this case, the number of water level measurement units Y1 provided in the troughs 3a to 3c can be reduced, and the average calculation unit 200 becomes unnecessary.

  Moreover, in this embodiment, although the base member 6 has the 1st leg part 61, the 2nd leg part 62, and the base part 63, it is not restricted to this. The trapezoidal member 6 may have any shape as long as it can stably support the distance meter 7.

X1 vaporizer Y1 water level measurement unit 2 vaporization panel 21 vaporization tube 3 trough 31 trough body 32 trough edge 33 one end 34 other end 35 intermediate portion 6 trapezoidal member 61 first leg portion 61a first recess portion 62 second leg portion 62a Second indentation part 63 Base part 7 Distance meter

Claims (7)

A plurality of vaporization tube panels configured by arranging a plurality of vaporization tubes into which liquid liquefied gas is introduced; and
A trough body disposed along each vaporization tube panel so that the heat exchange liquid is introduced and extends in a direction in which the plurality of vaporization tubes are arranged, and one end located on the vaporization tube panel side of the trough body And a plurality of troughs having trough edges extending from the vaporizing tube panel to the liquid exchange method for heat exchange of the vaporizer,
A measuring step of measuring the water level of the heat exchange liquid in each trough;
A comparison step for comparing the water levels in the troughs measured in the measurement step;
When the difference between the water levels in the troughs is outside a predetermined range in the comparison step, the heat exchange liquid with respect to the trough body of the troughs so that the difference falls within the predetermined range. A liquid adjustment method for heat exchange of a vaporizer, comprising: an adjustment step of adjusting a flow rate.   2. The heat exchange liquid adjustment method for a vaporizer according to claim 1, wherein in the measurement step, a water level of the heat exchange liquid flowing on the trough edge of each trough is measured. In the measurement step, the water level of the heat exchange liquid flowing on the trough edge at each of a plurality of locations in the length direction of each trough is measured,
In the comparison step, the average value of the water level in each of the plurality of locations of the troughs measured in the measurement step is calculated, and the average values in the troughs are compared with each other.
In the adjustment step, when the difference between the average values of the troughs is out of a predetermined range in the comparison step, the troughs with respect to the trough body so that the difference falls within the predetermined range. The heat exchange liquid adjustment method for a vaporizer according to claim 2, wherein the flow rate of the heat exchange liquid is adjusted.   In the measurement step, the water level in each trough is measured using a distance meter arranged on the trough edge and capable of measuring a distance between two points without contact with the trough edge. 4. A liquid adjustment method for heat exchange of a vaporizer according to 3. A vaporization tube panel configured by arranging a plurality of vaporization tubes into which liquid liquefied gas is introduced, and along the vaporization tube panel so that a liquid for heat exchange is introduced and extends in a direction in which the plurality of vaporization tubes are arranged. And a trough having a trough edge extending from one end located on the vaporizing tube panel side to the vaporizing tube panel side of the trough main body. A water level measurement unit for measuring the water level,
A trapezoidal member disposed on the trough edge;
A water level measurement unit comprising: a distance meter supported by the table member and measuring the water level.   The water level according to claim 5, wherein the table-shaped member includes a pair of legs disposed on the trough edge, and a table spanning the pair of legs and supporting the distance meter. Measuring unit. It said pair of legs, the provided from the upper end of the trough body has a recess recessed in the range over the Torafue' di, so that the recess is in contact with the upper edge of the upper end and the Torafuejji the side wall of the trough body The water level measurement unit according to claim 6, which is disposed on the trough edge.

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