JPH0755207A - Ice water slurry-conveying piping - Google Patents

Abstract

PURPOSE:To supply ice water slurries to an ice storage tank at a high ice content rate by blowing off the ice water slurries successively from a plurality of blowoff outlets one by one CONSTITUTION:An ice water slurry conveying piping body 15 is laid in an ice storage tank 12a from the side of the ice storage tank 12a. A downstream end of the conveying piping body 15 is connected with a first blowoff outlet 17 disposed vertically downwardly. In the course of the first blowoff outlet 17 a connection piping part 18 is substantially vertically connected with respect to the first blowoff outlet 17 and is constructed into a branch structure. An inner diameter of the connection piping part 18 is throttled such that it is reduced than that of the first blowoff outlet. The connection piping part 18 is constructed such that it penetrates a partition wall 13a and is laid in a next ice storage tank 12b. To a downstream end of the connection piping part 18, a vertically downwardly disposed second blowoff outlet 20 is connected through a diffuser 19.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ice water slurry transport pipe for supplying ice water slurry to an ice storage tank in a dynamic ice heat storage type district heating and cooling system.

[0002]

2. Description of the Related Art A dynamic type ice storage type district heating and cooling system is a system that uses fine ice and can convey the ice itself as a slurry. Since this system can convey slurry containing fine ice, the diameter of the supply pipe to the cold heat consuming facility can be reduced. In addition, the ice making device and the ice storage tank can be installed separately, which facilitates large-scale production. Further, since the ice to be conveyed is fine and the contact area between the ice and the water is large, it is possible to cope with a large heat load.

There are mainly the following two operating states of the dynamic type ice heat storage type district heating and cooling system during the cooling heat demand period. 1. Heat storage operation mode In this mode, the ice water slurry produced by the ice making device is stored in the ice storage tank when the heat load is small at night. The fluid at this time is an ice making device, an ice water slurry transfer pipe, an ice storage tank,
The return pipe and the ice making device are circulated in sequence.

2. Heat dissipation operation mode Cold heat stored in heat storage operation (cold water or ice water slurry)
Is a mode for supplying heat to the cold heat consumption facility. The fluid at this time is sequentially circulated in the paths of the ice storage tank, the outward cooling pipe, the heat demand destination, the return cooling pipe, and the ice storage tank.

An example of an ice water slurry transfer pipe for transferring ice water slurry from an ice making device to an ice storage tank in the heat storage operation mode of such a dynamic type ice storage type district cooling and heating system is "using supercooled water. Development of ice heat storage system "(Konogi, Japan Multiphase Flow Society 9th Multiphase Flow Lecture Series; Ice heat storage system and multiphase flow, p. 123,
(December 1992). As shown in FIG. 8, the ice water slurry transport pipe 90 includes a transport pipe body 91 that transports the ice water slurry 99 produced by an ice making device (not shown). A plurality of outlets 92 are branched and provided in the middle of the transfer pipe body 91, and the ice water slurry 99 is ejected to the ice storage tank 94 through the outlets 92.
Here, the blowout port 92 has a structure in which it is simply branched vertically upward from the transfer pipe main body 91. For this reason,
The ice water slurry 99 is simultaneously blown out from each blowout port 92.

A filter 9 for removing ice pieces from the ice storage tank 94.
The ice making water is returned to the ice making device through the 5 and the return pipe 96. That is, the ice water slurry or cold water is sequentially circulated through the ice making device, the ice water slurry carrying pipe 90, the ice storage tank 94, the return pipe 96 and the ice making device. Ice storage tank 94
The cold energy stored in the cold water is supplied in the form of low-temperature cold water to the cold heat consuming facility through the outward route cooling pipe 97, and after being used, the temperature of the water that has been raised is passed from the cold heat consuming facility through the return route cooling pipe 98. Returned to the ice storage tank.

Further, in the above document, as shown in FIG.
Other ice water slurry transport piping is also described. In this case, the ice water slurry transfer pipe 100 is branched from the transfer pipe main body 101 for transferring the ice water slurry produced by an ice making device (not shown) and the transfer pipe main body 101, and a plurality of ice storage tanks 102a are provided. Outlet 1 to reach to 102d
03, and a valve 104 is provided in the middle of each outlet 103 to sequentially supply the ice water slurry to each tank. Here, a plurality of ice storage tanks 102a-1
02d is connected via a filter 105 for removing ice pieces and a distribution pipe 107. In addition, the return pipe 108
The ice making water is conveyed from the ice storage tank 102d to the ice making device via the.

[0008]

In such a dynamic type ice heat storage type district heating and cooling system, the ice supplied from the ice making device is not spherical, and due to the cohesiveness of the ice itself, they are likely to stick to each other. As shown in
After being blown out from the opening 93 of the outlet 92, the ice storage tank 9
4 easily aggregates into a soft mass. When the ice fraction in the ice storage tank 94 increases, the ice is aggregated and stays near the opening 93. Therefore, the opening 93
The pressure loss from the blowout is high, and in the worst case, ice blocks 1
11 blocks the opening 112, and the supply of the ice water slurry is stopped. As a result, the supply of the ice water slurry may stop before the inside of the ice storage tank 94 reaches a sufficiently high ice content (about 30%).

Further, as the flow rate per unit time at the opening of the outlet is larger, the effect of the jet flow makes it possible to eliminate the ice that blocks the opening, so that it is possible to store a high ice content. FIG. 11 is a characteristic diagram showing a relationship between the blowout flow rate per unit time (minute) at the opening and the ice content rate (storage tank IPF; unit:%) capable of storing ice in the ice storage tank 94. In this experiment, 600 x 600 x 500 mm
The ice water slurry was supplied to the ice storage tank of No. 2 through an opening having a diameter of 40 mm installed vertically downward at a position of 40 mm from the bottom surface.

Further, once the opening is blocked by ice and the supply is stopped, the ice once covering the opening has a high cohesive property and is compacted, and it is difficult to remove it. It is difficult to restart the supply even if the (pressure) is increased.

The above-mentioned tendency is more or less the degree of opening 1
12 regardless of the blowing direction (vertically upward, vertically downward, horizontal) or the position of the opening (distance from water surface, distance from wall surface). When the amount of ice storage is small, the opening 112
The ice blown out from the surface floats and disperses on the surface of the water, but if some amount of ice accumulates above the water surface above the opening 112, the ice that has risen later will be captured by the ice that has already accumulated below the surface of the water. Are agglomerated. As a result, as shown in FIG. 10, ice agglomeration occurs in a substantially inverted pyramid shape below the water surface.

As described above, in order to store ice in the ice storage tank up to a high ice content, it is necessary to increase the flow rate of air discharged from the air outlet. However, as shown in FIG. 9, when the ice water slurry is blown out from the openings 93 of the plurality of blowout ports 92 vertically upwardly attached to the transfer piping main body 91 inside the ice storage tank 94, the following problems occur. Occurs.

One is that the percentage of ice that can be stored in the ice storage tank is low. That is, since the ice water slurry supplied from the ice making device is simultaneously blown out from the plurality of blowout ports 92, the blowout flow rate of the ice water slurry at each of the blowout ports 92 decreases as the number of the blowout ports 92 increases.
Therefore, before the inside of the ice storage tank 94 reaches a high ice content, some of the openings 93 are blocked with ice, and the supply of the ice water slurry is stopped. At this time, since the number of openings 93 is reduced, the ice water slurry is blown out at a larger flow rate from the remaining openings 93 that are not blocked. Nevertheless, the flow rate of the blowout is small as compared with the case where the single blowout port is provided, and eventually only the last remaining blowout port 92 blows the ice water slurry under the same conditions as when the single blowout port is provided. Therefore, even if a plurality of outlets 93 are provided, it is not possible to provide all the outlets with the same supply performance as a single outlet.

Therefore, it is conceivable that a valve or the like is provided at each outlet to mechanically blow out the ice water slurry sequentially from one outlet. In this case, the blowout flow rate at each blowout port becomes large, and ice can be stored up to a high ice content, but valve opening and closing operations are required, the device becomes complicated and expensive, and maintenance becomes more complicated. .

Second, it is difficult to manage and control the amount of ice stored in the ice storage tank. As shown in FIG. 9, when a plurality of ice storage tanks 102a to 102d are supplied without a valve or the like, it is random in which tank, at what percentage of ice, and in which order the ice is stored. Ice storage tanks 102a to 102
The controllability and controllability of the ice storage ice content of d are poor. Further, it is not necessary to store the ice water slurry in the full ice storage tank at the time of low demand for cold heat, and it is preferable to store it in a part of the ice storage tank. However, when the ice water slurry is supplied to the plurality of ice storage tanks 102a to 102d, each of the ice storage tanks 102a to 102d is supplied.
When the ice water slurry is supplied evenly to 2d little by little, the heat dissipation surface area becomes larger than that in the case where the same amount of ice water slurry is supplied to one ice storage tank. That is, since the cold heat is simultaneously dissipated on the water surface and the wall surface of each of the ice storage tanks 102a to 102d, the heat loss becomes large. For this reason, if the ice water slurry is evenly supplied to each of the ice storage tanks 102a to 102d, the "substantial / cold" of the cold heat available in the cold heat consuming facility can be obtained.
Effective ”Heat storage efficiency is poor. Therefore, also in this case, it is conceivable that a valve or the like is provided at each outlet to mechanically blow out the ice water slurry sequentially from one opening, but the same problem as described above occurs.

The present invention has been made in view of the above points, and with a simple structure, the ice water slurry is sequentially blown out from each of a plurality of outlets, and the ice water slurry is stored in the ice storage tank at a high ice fraction. Provided is a pipe for ice-water slurry transfer capable of supplying the above.

[0017]

SUMMARY OF THE INVENTION According to the present invention, a transport pipe main body and at least two outlets sequentially provided at an end of the transport pipe main body on the ice storage tank side are connected to each other.
Of the two outlets, a connecting pipe portion that branches from the upstream outlet and connects the two, and an ice water slurry that controls the flow of the ice water slurry in the connecting pipe portion provided in the middle of the connecting pipe portion. Flow control structure, wherein the ice water slurry flow control structure is a throttling structure for increasing pressure loss of the flow of the ice water slurry, and a flow velocity of ice in the ice water slurry to be conveyed to reduce retention of the ice. Provided is an ice-water slurry transport pipe, which is at least one of an attracting ice retention structure.

Here, the throttle structure for increasing the pressure loss of the flow of the ice water slurry is a structure having an effect of increasing the pressure loss of the flow of the ice water slurry, such as an orifice, a valve and a bent pipe. Further, the ice retention structure is, for example, a structure in which the flow velocity is small, such as a structure in which a flow passage cross-sectional area is large such as a sudden expansion portion, or a structure in which a density difference is used, such as a vertically downward flow portion. .

[0019]

The ice water slurry transport pipe of the present invention has an ice water slurry flow control structure for controlling the flow of the ice water slurry in the connection pipe portion in the connection pipe portion for connecting between two continuous outlets. At least one of a throttling structure for increasing the pressure loss of the flow and an ice retention structure for retaining the ice in the ice water slurry to be conveyed is provided. With this, when the supply of the ice water slurry is started, the flow of the ice water slurry from the upstream side to the downstream side in the pipe connection portion is restricted, so that the ice water slurry is easily blown out from the outlet on the upstream side, The flow rate of ice water slurry becomes smaller. Therefore, when the supply of ice water slurry is started, the ice water slurry mainly flows into the upstream outlet, and the flow rate of the ice water slurry at the upstream outlet is as large as when a single outlet is provided. Become. As the ice fraction near the upstream outlet increases, the opening of this outlet is blocked by ice, so the pressure loss of the flow of ice water slurry at the upstream outlet gradually increases, and the ice water The slurry mainly flows into the outlet on the downstream side. With the same configuration, the flow rate of the ice water slurry blown out at the blowout port provided after the blowout port on the downstream side is increased. By repeating this, finally, the flow rate of the ice water slurry at all the outlets becomes as large as when a single outlet is provided.

[0020]

Embodiments of the present invention will now be described in detail with reference to the drawings. The operating state of the system in all the embodiments described here is the heat storage operation mode.

FIG. 1 is a schematic view showing an embodiment of a pipe for carrying ice water slurry to an ice storage tank according to the present invention. The ice storage facility indicated by 11 in the figure is composed of three ice storage tanks 12a, 12b, 12c arranged in a line in the horizontal direction. A partition wall 1 is provided between the adjacent ice storage tanks 12a and 12b, 12b and 12c.
It is divided by 3a and 13b, respectively. Partition wall 13a,
The 13b is provided with communication pipes 14a and 14b for communicating the adjacent ice storage tanks 12a to 12c.

A transport pipe body 15 is laid from the side surface of the ice storage tank 12a to the inside of the ice storage tank 12a. The upstream end of the transport pipe main body 15 led out to the outside of the ice storage tank 12 a is connected to the ice storage device 16. The ice making device 16 used here is, for example, a device that produces sherbet-like ice such as a vacuum ice making machine, a device that produces ice by supercooling, or a device that crushes large ice blocks to produce fine-sized ice. It is a thing.

On the other hand, at the end of the transfer pipe body 15 on the ice storage tank 12a side, as shown in FIG. 2, a vertically downward first outlet 17 is formed. A branch portion is formed in the middle of the first outlet 17, and the connecting pipe portion 18 is formed in the first outlet 1.
7 is connected at a right angle. The inner diameter of the connection pipe portion 18 is narrowed so as to be smaller than the inner diameter of the first outlet 17.

The connecting pipe portion 18 penetrates the partition wall 13a and is piped inside the next ice storage tank 12b. The connection pipe portion 18 is connected via a diffuser 19 to a second outlet 20 arranged vertically downward. A branch portion is formed in the second outlet 20, and the second outlet 20
The connection piping section 18 'is connected. This second connecting pipe portion 18 'is also piped inside the next ice storage tank 12c, and its tip end is connected to the third outlet 21 arranged vertically downward through the diffuser 19'.

On the other hand, a forward route ground cooling pipe 22 for supplying ice water slurry or cold water to the cold heat consuming facility is connected to the lower side surface portion of the most upstream ice storage tank 12a. Further, a return path ground cooling pipe 23 that returns water from the cold heat consumption facility is connected to the upper side surface portion of the most downstream ice storage tank 12c.
A return pipe 24 for returning the ice making water to the ice making device 16 is connected to the lower side surface of the ice storage tank 12c.

According to the ice-water-slurry transfer pipe 10 having such a structure, the ice-water slurry stored in the ice storage equipment 11 is transferred from the ice making device 16 through the transfer pipe body 15 and firstly the first outlet 17 Will be introduced to. First
A branch portion is formed at the outlet 17, and the next ice storage tank 12b is formed.
A connection pipe portion 18 connected to the second outlet 20 for supplying the ice water slurry is connected. However, the connection piping part 1
8 is connected in a direction perpendicular to the flow direction of the ice water slurry inside the first outlet 17. Further, the inner diameter of the connection pipe portion 18 is narrowed so as to be smaller than that of the first outlet 17. Due to these, the flow velocity of the ice-water slurry inside the second outlet 20 becomes small, and the ice in the ice-water slurry stays in the vertical downward flow portion of the second outlet 20. Therefore, the pressure loss of the flow of the ice water slurry to the second outlet 20 is larger than that of the first outlet 17. For this reason, the ice water slurry is likely to flow out from the opening of the first outlet 17 on the upstream side, and the flow rate to the second outlet on the downstream side through the connecting pipe portion 18 becomes smaller and smaller. As a result, substantially the entire amount of the ice water slurry that has been conveyed through the conveyance pipe body 15 is first blown out into the inside of the most upstream ice storage tank 12a through the first outlet 17. In this way, the ice water slurry 2 to the ice storage tank 12a
5 are supplied.

Next, the supply of the ice water slurry 25 proceeds,
When the ice is accumulated inside the ice storage tank 12a and the ice content rate inside the ice storage tank 12a becomes high, the first outlet 1
The opening of 7 is closed by ice, and the first outlet 1
The pressure loss of the ice water slurry 25 blown out from No. 7 gradually increases. When this pressure loss becomes larger than the flow pressure loss of the flow path to the second outlet 20 on the downstream side, the ice water slurry flows into the second outlet 20 via the connecting pipe portion 18. At this time, also between the second outlet 20 and the third outlet 21 provided on the downstream side, similarly to the above, the flow pressure loss of the pipeline reaching the third outlet 21 causes the second outlet 20 to flow. Since it is higher than that, most of the ice water slurry is supplied from the second outlet 20 to the ice storage tank 12b. Then, when the ice content rate of the ice storage tank 12b becomes high, the ice water slurry flows into the third outlet 21, and the supply of the ice water slurry to the ice storage tank 12c starts.

As described above, of the plurality of first to third outlets 17, 20 and 21, from the upstream side, one outlet is sequentially supplied from the ice making device 16 so that substantially the entire amount of the ice water slurry is supplied. However, in sequence, each ice storage tank 12a-12
is supplied to c. Therefore, the flow rate of the ice water slurry at each outlet can be increased to the same extent as when a single outlet is provided. As a result, the ice water slurry can be supplied to each of the ice storage tanks 12a to 12c up to a high ice content.

Further, since the ice water slurry can be sequentially supplied to the plurality of ice storage tanks 12a to 12c from the upstream side, if the supply of the ice water slurry from the manufacturing apparatus 16 is stopped at an arbitrary timing, an arbitrary number of ice storage tanks can be supplied from the upstream side. It is also possible to control the ice storage only in the tank.

Further, the above-described control of the ice water slurry supply can be carried out without using a mechanical control means such as a valve. As a result, the device can be simplified, so that it is relatively inexpensive, and the labor of maintenance can be reduced.

FIG. 2 shows an ice water slurry flow control structure for controlling the flow of ice water slurry from the upstream side to the downstream side outlet in the connecting pipe portion connecting the upstream outlet and the downstream outlet. In addition to the structure shown, the following ones are possible.

First, as shown in FIG. 3, the connection pipe portion 32 is connected substantially vertically to the outlet 31 on the upstream side.
Is provided with a sudden expansion portion 33 having an abruptly increased inner diameter, and the flow velocity of the ice water slurry is reduced to cause retention of ice in the ice water slurry, and the ice water slurry to the outlet 34 connected to the downstream side thereof is caused. The pressure loss of the flow can be increased.

Further, as shown in FIG. 4, a long vertical downward flow portion 41 is provided at the outlet 34 on the downstream side, and the buoyancy of ice is used to induce the retention of ice, thereby increasing the pressure loss of the ice water slurry. be able to. Further, as shown in FIG. 5, the blowout portion 34 on the downstream side may be provided with a long vertical downward flow portion 51 and a sudden expansion portion 52.

FIG. 6 shows an example of an ice water slurry supply device in which a plurality of outlets are provided in one ice storage tank when the ice storage tank is large. Inside the ice storage tank indicated by 61 in the figure, three outlets 62 to 64 are arranged at predetermined intervals, between the most upstream outlet 62 and the second outlet 63, and the second outlet. The opening 63 and the third outlet 64 are connected to each other via the connection piping portion 65 and the diffuser 66, as in FIG.

Also in this case, the most upstream outlet 62
The supply of the ice water slurry 67 is started from the opening 62.
When the ice fraction near a becomes high and the opening 62a is blocked by ice, the ice water slurry will flow into the second outlet 63. In this way, the ice water slurry is sequentially blown out at a plurality of outlets at a sufficient flow rate, so that the inside of the ice storage tank 61 can be uniformly stored with a high ice fraction.

The number of outlets is appropriately determined according to the capacity of the ice storage tank 61 so that the ice storage can be performed at a high ice content ratio. Next, as shown in FIG. An example of an ice water slurry supply device for supplying ice water slurry will be shown.

Reference numeral 71 in the figure denotes an ice storage facility constituted by arranging n ice storage tanks 72 horizontally. A partition wall 73 separates the adjacent ice storage tanks 72. A communication pipe 74 is provided on the partition wall 73, and the adjacent ice storage tanks 72 communicate with each other.

Inside the ice storage tank 72, outlets 75 are respectively provided.
Is provided. The tip of the outlet 75 is bent vertically downward. These outlets 75 are joined together as a set of three and are connected to the outlet main pipe 76 to form blocks 80 and 81. In the middle of the outlet main pipe 76 of the upstream block 80, a connecting pipe portion 77 having an inner diameter smaller than the inner diameter of the outlet main pipe 76.
Is connected to the outlet main pipe 76 almost vertically. The other end of the connection pipe 77 is connected to the end of the outlet main pipe 76 of the block 81 on the downstream side via a diffuser 78.

In this case, in each of the blocks 80 and 81, the ice water slurry supplied through the outlet main pipe 76 is simultaneously blown out from the three outlets 75. Since the blocks 80 and 81 are connected by the connection pipe portion 77 having an inner diameter smaller than that of the outlet main pipe 76, the ice water slurry is sequentially supplied from the upstream block in the same manner as described above.

In the above-mentioned embodiment, the outlet is vertically downward, but it may be in any direction. In addition to reducing the inner diameter, the throttle structure of the connecting pipe portion 18 may be any structure that increases the pressure loss of the ice water slurry in the connecting pipe portion 18, such as an orifice, a valve, and a bent portion. The valve here is for adjusting the degree of throttling, and once the opening is set, it does not require frequent operation, and as mentioned in the prior art, it is always necessary to control the opening and closing. Are basically different in their purpose and usage.

[0041]

EFFECTS OF THE INVENTION The pipe for conveying ice-water slurry according to the present invention has a connecting pipe portion for connecting continuous blowout ports with a throttle structure for increasing pressure loss of the flow of ice-water slurry, and ice in the ice-water slurry to be conveyed. Is provided for at least one of the ice retention structures. As a result, the flow of the ice water slurry to the outlet on the downstream side can be controlled without applying power from the outside or controlling the opening / closing operation of the valve, and the outlet of the ice water slurry on the outlet of the upstream side can be controlled. The flow rate can be made larger than the flow rate of the ice water slurry blown out from the outlet on the upstream side, and the ice water slurry can be blown out one by one from the downstream side and supplied to the ice storage tank.
This makes it possible to increase the blowout flow rate at the opening of each blowout opening to the same extent as in the case where a single blowout opening is provided, and supply the ice water slurry to the entire inside of the ice storage tank with a high ice fraction.

[Brief description of drawings]

FIG. 1 is a schematic view showing a first embodiment of a pipe for carrying ice water slurry according to the present invention.

FIG. 2 is a cross-sectional view showing a connection pipe portion that connects an upstream side outlet and a downstream side outlet of the ice water slurry transfer pipe shown in FIG.

FIG. 3 is a cross-sectional view showing another example of the connection piping section shown in FIG.

FIG. 4 is a cross-sectional view showing another example of the connection pipe section shown in FIG.

5 is a cross-sectional view showing another example of the connection pipe section shown in FIG.

FIG. 6 is a schematic view showing a second embodiment of the ice water slurry transport pipe of the present invention.

FIG. 7 is a schematic view showing a third embodiment of the ice water slurry transport pipe of the present invention.

FIG. 8 is a schematic view showing a conventional pipe for conveying ice water slurry.

FIG. 9 is a schematic view showing a conventional ice water slurry transport pipe.

FIG. 10 is a schematic view showing a conventional pipe for conveying ice water slurry.

FIG. 11 is a characteristic diagram showing the relationship between the flow rate of the ice water slurry blown into the ice storage tank and the percentage of ice that can be stored in the ice storage tank.

[Explanation of symbols]

10 ... Pipe for conveying ice water slurry, 11 ... Ice storage facility, 12
a, 12b, 12c ... Ice storage tank, 15 ... Transport pipe body,
16 ... Ice-making device, 17 ... 1st outlet, 18 ... Connection piping part, 19 ... Diffuser, 20 ... 2nd outlet, 21 ...
Third outlet, 22 ... outward cooling pipe, 23 ... return cooling pipe, 24 ... water return pipe.

Claims (1)

[Claims] 1. An ice water slurry transfer pipe for transferring ice water slurry from an ice making device to at least one ice storage tank, wherein the transfer pipe main body and an end portion of the transfer pipe main body on the ice storage tank side are successively connected in succession. At least two outlets provided, a connecting pipe portion branching from the upstream outlet of the two continuous outlets and connecting both, and the connecting pipe provided in the middle of the connecting pipe portion An ice water slurry flow control structure for controlling a flow of the ice water slurry in a section, wherein the ice water slurry flow control structure enhances a pressure loss of the flow of the ice water slurry, and the ice water slurry being conveyed. The pipe for conveying ice-water slurry, comprising at least one of an ice retention structure for reducing the flow velocity of ice to induce retention of the ice.