JP2020070966A - Tank having temperature unevenness eliminating function and method for eliminating temperature unevenness in tank - Google Patents

Abstract

To provide a tank with a temperature unevenness eliminating function, which can make a temperature of fluid in the tank even reliably with a simple structure, to eliminate temperature unevenness without using power for agitation.SOLUTION: A return water pipe 30 has a spiral part 32, is guided from the lower part of a body 20 to the upper part thereof, and eliminates temperature unevenness of accumulated water 10 by heat exchange. Also, the spiral part 32 is provided with a large number of silencer bushes 34, and by discharging a small amount of drain from here, it is possible to suppress the occurrence of a water hammer and eliminate the temperature unevenness of the accumulated water 10. Further, by discharging drain in a shower manner from a shower head 36 attached to the terminal end of the spiral part 34, it is possible to eliminate the temperature unevenness of the accumulated water 10 more reliably.SELECTED DRAWING: Figure 1

Description

  A tank having a temperature unevenness eliminating function and a method for eliminating temperature unevenness in a tank according to the present application relate to a technique for eliminating and making uniform the temperature unevenness of a fluid accumulated in the tank.

  In an industrial plant, steam may be used as a heat source for various devices. Steam as a heat source is generated by a boiler, and then transferred through a piping system and given to various devices. The steam given to the various devices transfers heat to the object to be heated through the heat exchanger.

  A water tank is connected to the boiler to supply water to the boiler. Make-up water is injected from the outside into the water supply tank to accumulate a predetermined amount of water, and the water is supplied to the boiler.

  By the way, the steam used as a heat source in various devices loses latent heat and condenses to generate high temperature condensed water (drain). If this drain excessively stays inside the piping system, it will hinder vapor transfer. Therefore, a large number of steam traps are arranged everywhere in the piping system. The steam trap responds to the amount of drain water in the valve chamber and automatically drains the drain from the piping system.

  Then, in order to reuse the drained drain, this drain is collected through the return water pipe and injected into the water supply tank. That is, in the water supply tank, the makeup water injected from the outside and the high-temperature drain collected through the return water pipe are mixed.

  As a technique for injecting a fluid such as water into the tank, there is a drain recovery device for a degassed water supply tank disclosed in Patent Document 1 described later. This technology prevents the drain from touching the air and re-dissolving the air when injecting the collected drain toward the degassed water accumulated in the water supply tank 1, and the drain flows. The lower end of the mixing pipe 3 is arranged below the water level of deaerated water. A large number of discharge ports 31 are formed in the lower portion of the mixing pipe 3, and pressure relief holes 32 are formed in the upper portion.

  Further, Patent Document 2 discloses a ren tank of a power plant in which a drain pipe 2 is vertically arranged in a drain tank 10 and a tip end thereof is submerged in a drain 11 inside the tank. An elbow pipe 17 that bends the pipe line in a right angle direction is attached to the tip of the drain pipe 2. The elbow pipe 17 circulates the discharged water flow in the horizontal direction, and then reaches the suction port 13 of the drain suction pump 12. This prevents bubbles contained in the discharge water flow from being sucked into the drain suction pump 12 and lowering pump efficiency.

  Further, Patent Document 3 discloses a composite hot water cylinder structure for a water dispenser in which a coil-type heater 40 is arranged in the hot water cylinder 10 for producing hot water for drinking or the like. The heater 40 has coil-shaped axes arranged in the horizontal direction to form a coil in the horizontal direction. A configuration is also disclosed in which an inflow pipe 30 for supplying raw water before heating to the hot water cylinder 10 is arranged in a coil around the heater 40 (Fig. 6 and the like). The coil-shaped shaft of this inflow pipe is arranged in the vertical direction, and raw water is injected from the upper end and discharged at the lower end to supply water.

Japanese Utility Model Publication No. 4-49710 JP 2008-175408 JP Special Table 2018-516808 Bulletin

  However, in the technique disclosed in the above-mentioned Patent Document 1, there is a problem that the temperature of the water in the water supply tank 1 is not uniformized and temperature unevenness occurs. That is, the drainage generated by the condensation of the high-temperature steam is hot water of 80 ° C or higher, and when this high-temperature drain is injected into the water supply tank 1, temperature unevenness with a large temperature difference occurs in the water supply tank 1. Will end up. The temperature unevenness is not eliminated by the natural convection of water in the water supply tank 1, and if water is supplied to the boiler in this state, steam generation in the boiler is not stable, which causes troubles.

  Further, also in the technique disclosed in Patent Document 2 described above, temperature unevenness occurs in the drain in the drain tank 10 as well. The high temperature drain flows out in the lateral direction by the elbow pipe 17 attached to the tip of the drain pipe 2, but the temperature of the drain accumulated in the drain tank 10 decreases with the passage of time. Temperature unevenness will occur between the injected high temperature drain.

  Further, the technique disclosed in Patent Document 3 described above does not have a configuration in which a high-temperature drain is injected into the tank, and does not have a mechanism for eliminating temperature unevenness. That is, the raw water that is injected from the upper side to the lower side through the inflow pipe 30 is cold water that has not been heated yet, and this is only heated by the heater 40 in the tank, and the temperature unevenness in the tank is not eliminated.

  As described above, in each of the prior arts, the temperature unevenness of the fluid in the tank cannot be eliminated. Therefore, it may be possible to provide a mechanism for stirring the fluid in the tank based on the power to eliminate the temperature unevenness, but in this case, there is a new problem that the structure of the tank device becomes complicated and increases in size. ..

  Therefore, in order to solve these problems, the tank having the temperature unevenness eliminating function and the method for eliminating the temperature unevenness in the tank according to the present application do not use the power for agitation, and reliably remove the fluid in the tank with a simple configuration. An object of the present invention is to provide a tank having a temperature unevenness eliminating function capable of making the temperature uniform and eliminating the temperature unevenness and a method for eliminating temperature unevenness in the tank.

The tank having the function of eliminating temperature unevenness according to the present application,
A tank body for accumulating fluid,
An inflow path that enters from the bottom of the tank main body, is arranged in a spiral shape with the spiral axis formed in the vertical direction inside the tank main body, and has an end located at the upper part inside the tank main body. An inflow path for introducing a fluid having a temperature higher than that of the fluid accumulated in the inside of the tank main body and discharging the fluid from the end,
Outflow means formed at a plurality of locations of the inflow passage inside the tank body, for flowing out a small amount of fluid into the tank body,
Shower means provided at the end of the inflow passage for discharging the fluid in a shower shape,
It is characterized by having.

Further, the method for eliminating temperature unevenness in the tank according to the present application is
Inside the tank body for accumulating fluid, a fluid having a temperature higher than the temperature of the accumulated fluid is introduced along the inflow path from the lower part,
Inside the tank body, while letting out a small amount of fluid from a plurality of inflow passages, the fluid is guided along a spiral inflow passage in which the spiral axis is formed in the vertical direction,
From the end of the inflow passage located in the upper part inside the tank body, the fluid is discharged in a shower shape,
It is characterized by

  In the tank having the temperature unevenness eliminating function and the method for eliminating temperature unevenness in the tank according to the present application, the temperature of the fluid in the tank main body is high from the lower part to the upper part, and the high temperature fluid is introduced into the inflow path. It is guided along from the bottom to the top. Therefore, since the temperature of the lower part of the fluid in the tank main body rises due to the heat exchange, the temperature of the fluid guided along the inflow path decreases, so that the temperature of the fluid in the tank can be made uniform uniformly with a simple configuration. It is possible to eliminate temperature unevenness. Further, since the high temperature fluid is guided in a spiral shape along the inflow path, the inflow path can be secured for a long time and the efficiency of heat exchange can be improved.

  Further, by guiding a fluid while letting out a small amount of fluid from a plurality of inflow passages inside the tank body, the temperature of the fluid in the tank can be reliably made uniform by a simple configuration to eliminate temperature unevenness. You can Moreover, since a small amount of the fluid is spirally flown out along the inflow path, the temperature of the fluid in the tank can be more surely made uniform and the temperature unevenness can be eliminated. Furthermore, by causing a small amount of fluid to flow out from a plurality of locations in the inflow path, a stirring action occurs inside the tank main body, and the temperature of the fluid in the tank can be made more reliable and uneven temperature can be eliminated.

  Further, by discharging the fluid in a shower shape from the end of the inflow passage located in the upper part inside the tank body, it is possible to reliably equalize the temperature of the fluid in the tank and eliminate the temperature unevenness with a simple configuration. it can. Furthermore, by discharging the fluid in the form of a shower, a stirring action occurs inside the tank main body, and the temperature of the fluid in the tank can be more reliably made uniform to eliminate temperature unevenness.

FIG. 1 is a partial cross-sectional view of a water supply tank 2 showing a first embodiment of a tank having a temperature unevenness eliminating function and a method for eliminating temperature unevenness in the tank according to the present application.

[Explanation of Terms in Embodiment]
The main terms used in the embodiments correspond to the following elements of the tank having the temperature unevenness eliminating function and the method for eliminating temperature unevenness in the tank according to the present application, respectively.
Water supply tank 2 ... Tank accumulated water 10, drain ... Fluid main body 20 ... Tank main body Return water pipe 30, introduction pipe 31, spiral pipe 32 ... Inflow path Silencer bush 34 ... Outflow means, outflow hole Shower head 36 ... Shower means Spiral center line L1 ... Spiral axis

[First Embodiment]
A first embodiment of a tank having a temperature unevenness eliminating function and a method for eliminating temperature unevenness in the tank according to the present application will be described with reference to FIG.

(Explanation of the overall structure of the water supply tank 2)
The water tank 2 is a device for supplying water to the boiler. Accumulated water 10 is accumulated in the main body 20 of the water supply tank 2, and the accumulated water 10 is directed to a boiler (not shown) by suction of a pump through a water supply pipe 22 provided at the lower part of the main body 20. Water is supplied. The boiler receives the water supply to generate steam, and transfers the steam through the connected piping system. And this steam is used as a heat source of various devices.

  A replenishment pipe 21 is provided above the main body 20, and replenishment water at room temperature is replenished from the replenishment pipe 21. The water supply tank 2 is provided with a feedback mechanism (not shown) that detects the water level of the accumulated water 10 and controls the amount of makeup water, and the accumulated water 10 is kept at a predetermined water level. A ventilation hole 26 for ventilation is provided on the ceiling surface of the main body 20.

  The steam used as a heat source by various devices connected to the piping system loses latent heat and condenses to generate high-temperature drain. The generated drain is separated from the steam and discharged by a large number of steam traps installed throughout the piping system. The discharged drain is intensively collected by the return water pipe 30, and is integrated into the accumulated water 10 of the water supply tank 2 for reuse. This drain is hot water at 80 ° C or higher.

  An entrance hole 24 is formed in the lower part of the main body 20, and an introduction pipe 31 of the return water pipe 30 enters the main body 20 from here. In addition, a sealing material (not shown) is provided between the entry hole 24 and the return water pipe 30 to prevent leakage of the accumulated water 10.

  The introduction pipe 31 of the return water pipe 30 that has entered the main body 20 is connected to the spiral pipe 32. In the present embodiment, the spiral tube 32 is formed by drawing a spiral of six turns, and the spiral centerline L1 is located in the vertical direction. That is, the return water pipe 30 that has entered from the lower portion of the main body 20 guides the high-temperature drain spirally toward the upper portion inside the main body 20.

  A shower head 36 is connected to the uppermost end of the spiral tube 32. A large number of shower holes are formed on the discharge surface of the shower head 36, and the drain is discharged in a shower shape from here.

  Further, a large number of silencer bushes 34 are provided on the spiral pipe 32 of the recirculating water pipe 30. The silencer bush 34 is configured with a fine mesh-shaped outflow surface, and is fitted and fixed in through holes formed in various places of the spiral tube 32. The silencer bush 34 is provided on the outer peripheral surface of the spiral tube 32 at an irregular position at least in the circumferential direction.

(Explanation of drain discharge operation)
Next, the operation of discharging the drain into the main body 20 of the water supply tank 2 will be described. As described above, since the collected high-temperature drain is discharged to the main body 20, the accumulated water 10 contains both the normal-temperature makeup water and the high-temperature drain. Therefore, if left to natural convection, the water temperature in the upper part is high and the water temperature in the lower part is low. In addition, it is assumed that the water temperature of the upper part of the accumulated water 10 in the main body 20 is about 70 ° C and the water temperature of the lower part thereof is about 50 ° C.

  Among them, in the present embodiment, the high temperature drain is first guided to the lower part in the main body 20 through the introduction pipe 31, and flows spirally in the spiral pipe 32 toward the upper part. At this time, heat exchange is performed between the high temperature drain and the accumulated water 10 via the spiral pipe 32, and for example, the water temperature at the lower portion of the accumulated water 10 in the main body 20 is increased to about 60 ° C. Be done. On the other hand, the temperature of the drain flowing in the spiral tube 32 gradually decreases as it is guided to the upper part, and the temperature in the vicinity of the shower head 36 at the end greatly decreases.

  Then, the drain whose temperature has dropped is discharged from the shower head 36, so that, for example, the water temperature of about 70 ° C. above the accumulated water 10 in the main body 20 drops to about 60 ° C. Thus, the temperature of the accumulated water 10 in the tank 20 is made uniform by the heat exchange action between the high-temperature drain and the accumulated water 10, and the temperature unevenness can be eliminated. In addition, since the drain is guided along the spiral tube 32 in the main body 20, it is possible to secure a longer flow path and to further improve the efficiency of heat exchange, as compared with the case of being guided linearly.

  Further, as described above, the spiral pipe 32 of the ring water pipe 30 is provided with a large number of silencer bushes 34 having a fine mesh-shaped outflow surface. Therefore, the drain flowing in the spiral tube 32 is guided along the spiral tube 32 while slightly flowing out from the mesh-shaped outflow surface of each silencer bush 34.

  Therefore, a small amount of drain can be gradually mixed in the accumulated water 10 from the lower part to the upper part in a spiral manner, and the temperature of the accumulated water 10 can be made uniform and the temperature unevenness can be reliably eliminated. Further, the outflow of a small amount of drain can cause a stirring action with respect to the accumulated water 10 of the main body 20, so that the temperature of the accumulated water 10 can be made more uniform and the temperature unevenness can be eliminated. As described above, since the silencer bush 34 is provided at an irregular position in at least the circumferential direction of the outer peripheral surface of the spiral tube 32, it drains the drain in multiple directions to provide a higher stirring action. Can be generated.

  By the way, the silencer bush 34 has a function of preventing a water hammer from occurring in the accumulated water 10 in the main body 20, and this is used as a drain outflow means in the present embodiment.

  That is, the high-temperature drain is vapor that is condensed and liquefied, but when it flows through the return water pipe 30, it is re-evaporated to generate flash vapor (re-vaporized vapor). Therefore, when discharged into the main body 20, the high temperature flash vapor is discharged together with the high temperature drain. When this high-temperature flash steam mixes with the low-temperature water, the flash steam again condenses and returns to the drain.

  Here, the specific volume difference between the steam and the drain is 1000 times or more, and the flash steam instantly condenses and the steam volume becomes almost zero. During this condensation process, the space where the flash vapor was present temporarily becomes a vacuum state. Therefore, when a mass of flash vapor is suddenly discharged into low-temperature water, a wide vacuum region is created, and the surrounding water is attracted toward this vacuum region, causing water to collide with each other and generating a water hammer. ..

  It is the silencer bush that prevents the occurrence of this water hammer, and by flushing the flash steam into fine bubbles through a fine mesh-like outflow surface, it minimizes the vacuum area and prevents the occurrence of water hammer. There is.

  As described above, since the silencer bush 34 has a function of preventing the occurrence of a water hammer, in the present embodiment, by providing a large number of silencer bushes 34 on the spiral pipe 32, the stirring action of the accumulated water 10 can be achieved. It is possible to prevent the generation of the water hammer in the main body 20 as well as to generate the water hammer.

  Thus, the drain guided along the spiral tube 32 reaches the end of the spiral tube 32 and is discharged from the shower head 36 into the accumulated water 10. By discharging the drain in the form of a shower, the temperature of the fluid in the main body 20 can be made uniform and the temperature unevenness can be eliminated with a simple configuration, and at the same time, a stirring action occurs on the accumulated water 10 in the main body 20. It is possible to make the temperature of the accumulated water 10 uniform more surely and eliminate the temperature unevenness.

[Other Embodiments]
In the above-described embodiment, the example in which the tank having the temperature unevenness eliminating function and the method for eliminating temperature unevenness in the tank according to the present application are applied to the water supply tank for supplying water to the boiler has been described. Instead, it can be applied to tanks of other types and structures as long as the fluid is accumulated inside.

  Further, in the above-described embodiment, the example in which the shower head 36 is provided at a position where the shower head 36 is submerged in the accumulated water 10 is shown. However, the shower head 36 (shower means) is arranged above the water surface of the accumulated water 10 (fluid). It is also possible to discharge the shower-shaped drain from the upper side toward the water surface. Note that the shower means may have any other structure as long as it discharges the fluid in a shower shape.

  Further, in the above-described embodiment, the spiral pipe 32 arranged by drawing a spiral of 6 rounds is illustrated, but the spiral tube 32 is not limited to this, and the spiral of 5 rounds or less including 1 round or 7 rounds or more. You may employ the structure which draws.

2: Water tank 10: Accumulated water 20: Main body 30: Return pipe 31: Introduction pipe
32: Spiral tube 34: Silencer bush 36: Shower head
L1: spiral centerline

Claims (3)

A tank body for accumulating fluid,
An inflow path that enters from the bottom of the tank body, is arranged in a spiral shape with the spiral axis formed in the vertical direction inside the tank body, and has an end located at the upper part inside the tank body. An inflow path for introducing a fluid having a temperature higher than that of the fluid accumulated in the inside of the tank main body and discharging the fluid from the end,
Outflow means formed at a plurality of locations of the inflow passage inside the tank body, for flowing out a small amount of fluid into the tank body,
Shower means provided at the end of the inflow passage for discharging the fluid in a shower shape,
A tank having a temperature unevenness eliminating function, which is characterized by having In the tank having the function of eliminating temperature unevenness according to claim 1,
The outflow means is an outflow hole having a mesh-shaped outflow surface,
A tank that has the function of eliminating temperature unevenness. Inside the tank body for accumulating fluid, a fluid having a temperature higher than the temperature of the accumulated fluid is introduced along the inflow path from the lower part,
Inside the tank body, while letting out a small amount of fluid from a plurality of inflow passages, the fluid is guided along a spiral inflow passage in which the spiral axis is formed in the vertical direction,
From the end of the inflow passage located in the upper part inside the tank body, the fluid is discharged in a shower shape,
A method for eliminating temperature unevenness in a tank, which is characterized in that

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