JP7145038B2 - Tank having temperature unevenness elimination function and method for eliminating temperature unevenness in tank - Google Patents

Description

TECHNICAL FIELD A tank having a temperature unevenness elimination function and a method for eliminating temperature unevenness in a tank according to the present application relate to a technique for eliminating temperature unevenness of a fluid accumulated in a tank and equalizing the temperature unevenness.

Industrial plants sometimes use steam as a heat source for various devices. Steam as a heat source is generated in a boiler and then transferred through a piping system to be supplied to various devices. Steam supplied to various devices transfers heat to an object to be heated via a 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, a predetermined amount of water is accumulated, and water is supplied to the boiler.

By the way, steam used as a heat source in various devices loses latent heat and condenses to generate high-temperature condensed water (drain). If this drain accumulates excessively inside the piping system, it becomes an obstacle to steam transfer. For this reason, many 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 water return pipe and injected into the water supply tank. In other words, make-up water injected from the outside and high-temperature drain collected through the water return pipe are mixed in the water supply tank.

As a technique for injecting a fluid such as water into a tank, there is a drain recovery device for a water supply tank for degassed water disclosed in Patent Document 1 described later. This technology prevents the drain from coming into contact with air and re-dissolving the air when injecting the collected drain into the degassed water accumulated in the water supply tank 1. The lower end of the mixing pipe 3 is arranged below the water level of the degassed water. A large number of outlets 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 drain tank for a power plant in which a drain pipe 2 is arranged vertically in a drain tank 10 and the tip is submerged in a drain 11 in the tank. An elbow pipe 17 is attached to the tip of the drain pipe 2 to bend the pipe in a right angle direction. The elbow pipe 17 allows the discharged water flow to circulate in the horizontal direction and then reach the suction port 13 of the drain suction pump 12 . This prevents a situation in which air bubbles contained in the discharged water flow are sucked into the drain suction pump 12 and the pump efficiency is lowered.

Furthermore, 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 in order to make hot water for drinking or the like. The heater 40 forms a transverse coil with the coil-shaped axis arranged horizontally. A configuration is also disclosed in which an inflow pipe 30 for supplying unheated raw water to the hot water cylinder 10 is arranged in a coil shape around the heater 40 (FIG. 6, etc.). The coil-shaped axis of this inflow pipe is arranged in the vertical direction, and the raw water is injected from the upper end and discharged from the lower end to supply the water.

Japanese Utility Model Laid-Open No. 4-49710 JP-A-2008-175408 Japanese Patent Publication No. 2018-516808

However, the technique disclosed in the aforementioned Patent Document 1 has a problem that the temperature of the water in the water supply tank 1 is not made uniform, resulting in temperature unevenness. That is, the condensate generated by the condensation of high-temperature steam is hot water of 80°C or higher, and when this high-temperature condensate is injected into the water supply tank 1, temperature unevenness with a large temperature difference occurs within the water supply tank 1. end up The natural convection of the water in the water supply tank 1 does not eliminate the temperature unevenness, and if water is supplied to the boiler in this state, the generation of steam in the boiler will not be stable, causing a problem.

Also, in the technique disclosed in the above-mentioned Patent Document 2, the temperature of the drain in the drain tank 10 is similarly uneven. The high-temperature drain flows laterally from 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 lapse of time. Temperature non-uniformity will occur between the high-temperature drain to be injected.

Furthermore, the technique disclosed in the aforementioned Patent Document 3 does not have a structure in which 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 downward through the inflow pipe 30 is cold water before it is warmed, and this is only warmed by the heater 40 in the tank, and the temperature unevenness in the tank is not resolved.

As described above, each prior art cannot eliminate the temperature unevenness of the fluid in the tank. For this reason, it is conceivable to provide a mechanism that agitates the fluid in the tank based on power to eliminate the temperature unevenness, but in this case, a new problem arises that the structure of the tank device becomes complicated and large. .

Therefore, in order to solve these problems, the tank having the function of eliminating temperature unevenness and the method for eliminating temperature unevenness in the tank according to the present application are capable of reliably dissolving the fluid in the tank with a simple configuration without using power for stirring. An object of the present invention is to provide a tank having a temperature nonuniformity elimination function capable of eliminating temperature nonuniformity by equalizing temperature, and a temperature nonuniformity elimination method within the tank.

The tank having the function of eliminating temperature unevenness according to the present application is
a tank body for accumulating fluid;
An inflow passage that enters the inside of the tank body from the bottom, is arranged in a spiral shape with the spiral axis formed in the vertical direction inside the tank body, and has a terminal end located at the top inside the tank body, an inflow passage that guides a fluid having a higher temperature than the fluid accumulated in the tank body into the tank body and discharges the fluid from the terminal end;
Outflow means formed at a plurality of locations of the inflow passage inside the tank body for causing a small amount of fluid to flow out to the inside of the tank body;
Shower means provided at the end of the inflow channel for discharging the fluid in a shower-like manner;
characterized by comprising

Further, the method for eliminating temperature unevenness in the tank according to the present application includes:
introducing and guiding a fluid having a temperature higher than the temperature of the accumulated fluid along the inflow path from the bottom into the tank body that accumulates the fluid;
Inside the tank body, guide the fluid along the spiral inflow path with the spiral axis formed in the vertical direction while causing a small amount of fluid to flow out from multiple points of the inflow path,
The fluid is discharged like a shower from the end of the inflow channel located at the top inside the tank body,
It is characterized by

In the tank having the function to eliminate temperature unevenness and the method for eliminating temperature unevenness in the tank according to the present application, the temperature of the fluid in the tank body is high from the bottom to the top. It is led along from the bottom to the top. Therefore, heat exchange raises the temperature of the lower part of the fluid in the tank body and at the same time lowers the temperature of the fluid that is guided along the inflow path. Temperature unevenness can be eliminated. In addition, since the high-temperature fluid is spirally guided along the inflow passage, the length of the inflow passage can be ensured, and the efficiency of heat exchange can be enhanced.

Furthermore, by guiding the fluid while allowing a small amount of the fluid to flow out from a plurality of points of the inflow passage inside the tank body, the temperature of the fluid in the tank can be reliably made uniform with a simple structure to eliminate temperature unevenness. can be done. Moreover, since a very small amount of fluid spirally flows out along the inflow path, the temperature of the fluid in the tank can be made uniform more reliably, and temperature unevenness can be eliminated. Furthermore, by allowing a small amount of fluid to flow out from a plurality of points in the inflow path, a stirring action is generated inside the tank body, and the temperature of the fluid in the tank can be more reliably uniformed to eliminate temperature unevenness.

Further, by discharging the fluid in a shower form from the terminal 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 with a simple structure and eliminate temperature unevenness. can. Furthermore, by ejecting the fluid in the form of a shower, an agitation action is generated inside the tank body, and the temperature of the fluid in the tank can be more reliably uniformed to eliminate temperature unevenness.

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

[Explanation of terms in the embodiment]
The main terms used in the embodiments correspond to the following elements of the tank having the function of eliminating temperature unevenness and the method of eliminating temperature unevenness in the tank according to the present application.
Water supply tank 2: Tank Accumulated water 10, Drain: Fluid Body 20: Tank body Return 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 shaft

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

(Description of the overall configuration of the water supply tank 2)
The water supply 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 this accumulated water 10 is directed to a boiler (not shown) by suction of a pump through a water supply pipe 22 provided at the bottom of the main body 20. be watered. Boilers receive feed water, produce steam, and transport the steam through a connected piping system. This steam is then used as a heat source for various devices.

A replenishment pipe 21 is provided in the upper part of the main body 20, and normal temperature replenishment water is replenished from this replenishment pipe 21. - 特許庁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 replenishment water, so that the accumulated water 10 is kept at a predetermined water level. Also, the ceiling surface of the main body 20 is provided with ventilation holes 26 for ventilation.

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

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

The introduction pipe 31 of the water return pipe 30 entering the main body 20 is connected to the helical pipe 32 . In this embodiment, the helical tube 32 is configured by drawing a 6-round spiral, and the spiral center line L1 is positioned in the vertical direction. That is, the water return pipe 30 entering from the lower part of the main body 20 spirally guides the high-temperature drain to the upper part of 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 in the discharge surface of the shower head 36, and drain is discharged from these holes in a shower-like manner.

Also, the helical pipe 32 of the ring water pipe 30 is provided with a large number of silencer bushes 34 . The silencer bush 34 is configured with a fine mesh-like outflow surface, and is fixed by being fitted into through-holes formed at various locations in the spiral tube 32 . The silencer bushings 34 are provided at irregular positions on the outer peripheral surface of the helical tube 32 at least in the circumferential direction.

(Description 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 recovered high-temperature drain is discharged to the main body 20, the accumulated water 10 contains a mixture of room-temperature make-up water and high-temperature drain. For this reason, if natural convection is left to the water temperature, the upper water temperature will be higher and the lower water temperature will be lower. Suppose that the upper water temperature of the accumulated water 10 in the main body 20 is about 70°C and the lower water temperature is about 50°C.

Among them, in the present embodiment, the high-temperature drain is first introduced to the lower part of the main body 20 through the introduction pipe 31 and then spirally flows upward through the spiral pipe 32 . At this time, heat is exchanged between the high-temperature drain and the accumulated water 10 through the helical tube 32. be done. On the other hand, the temperature of the drain flowing through the helical tube 32 gradually drops as it is guided upward, and the temperature drops significantly near the shower head 36 at the end.

Then, as the temperature-lowered drain is discharged from the shower head 36, for example, the water temperature of the upper part of the accumulated water 10 in the main body 20 is lowered from approximately 70°C to approximately 60°C. In this way, the temperature of the accumulated water 10 in the tank 20 becomes uniform due to the heat exchange action between the high-temperature drain and the accumulated water 10, and the uneven temperature can be eliminated. Since the drain is guided along the helical tube 32 inside the main body 20, a longer flow path can be ensured than when the drain is guided straight, and the efficiency of heat exchange can be further enhanced.

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

Therefore, a small amount of drain can be gradually mixed into the accumulated water 10 spirally from the bottom to the top, and the temperature of the accumulated water 10 can be reliably uniformed to eliminate temperature unevenness. In addition, the outflow of this small amount of drain can generate a stirring action on the accumulated water 10 in the main body 20, so that the temperature of the accumulated water 10 can be more reliably uniformed and temperature unevenness can be eliminated. As described above, the silencer bush 34 is provided at an irregular position at least in the circumferential direction of the outer peripheral surface of the helical tube 32, so that the drain flows out in multiple directions to achieve a higher stirring action. can be generated.

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

That is, the high-temperature drain is condensed and liquefied steam, but when it flows through the water return pipe 30, it is re-evaporated to generate flash steam (re-evaporated steam). Therefore, when discharging into the main body 20, high-temperature flash steam is also discharged together with the high-temperature drain. When this hot flash steam mixes with the cold water, it condenses again 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. For this reason, if a mass of flash steam is discharged into low-temperature water all at once, a wide vacuum area is generated, and the surrounding water is attracted toward this vacuum area, causing the water to collide with each other and causing water hammer. .

It is the silencer bushing that prevents the occurrence of this water hammer, and by letting the flash steam flow out in the form of fine bubbles through the fine mesh-like outflow surface, the vacuum area is minimized and the occurrence of water hammer is prevented. there is

In this way, since the silencer bushing 34 has the effect of preventing the occurrence of water hammer, in the present embodiment, by providing a large number of silencer bushings 34 in the helical pipe 32, the accumulated water 10 can be stirred. In addition to preventing water hammer from occurring in the main body 20 .

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 reliably uniformed with a simple structure to eliminate temperature unevenness, and the accumulated water 10 in the main body 20 can be agitated. Therefore, the temperature of the accumulated water 10 can be made uniform more reliably, and temperature unevenness can be eliminated.

[Other embodiments]
In the above-described embodiment, an example in which the tank having the function of eliminating temperature unevenness and the method for eliminating temperature unevenness in the tank according to the present application is applied to the water supply tank for supplying water to the boiler was shown, but the present invention is limited to this. Instead, it can be applied to tanks of other types and structures as long as they accumulate fluid inside.

Further, in the above-described embodiment, an example was shown in which the shower head 36 was provided at a position submerged in the accumulated water 10, but the shower head 36 (shower means) was arranged above the surface of the accumulated water 10 (fluid). , a shower-like drain can be discharged from above toward the water surface. It should be noted that any other configuration can be adopted as the shower means as long as it discharges the fluid in a shower-like manner.

Furthermore, in the above-described embodiment, the helical tube 32 arranged in a 6-turn spiral was illustrated, but the spiral tube 32 is not limited to this, and the spiral tube has 5 turns or less including 1 turn or 7 turns or more. may be adopted.

2: Water tank 10: Accumulated water 20: Body 30: Return water pipe 31: Inlet pipe
32: Spiral tube 34: Silencer bush 36: Shower head
L1: spiral center line

Claims (3)

a tank body for accumulating fluid;
An inflow passage that enters the inside of the tank body from the bottom, is arranged in a spiral shape with the spiral axis formed in the vertical direction inside the tank body, and has a terminal end located at the top inside the tank body, an inflow passage that guides a fluid having a higher temperature than the fluid accumulated in the tank body into the tank body and discharges the fluid from the terminal end;
Outflow means formed at a plurality of locations of the inflow passage inside the tank body for causing the fluid to flow out to the inside of the tank body;
Shower means provided at the end of the inflow channel for discharging the fluid in a shower-like manner;
A tank having a function of eliminating temperature unevenness, comprising: In the tank having the function of eliminating temperature unevenness according to claim 1,
The outflow means are outflow holes having a mesh-like outflow surface,
A tank having a function of eliminating temperature unevenness, characterized by: introducing and guiding a fluid having a temperature higher than the temperature of the accumulated fluid along the inflow path from the bottom into the tank body that accumulates the fluid;
Inside the tank body, guiding the fluid along a helical inflow path having a vertical helical axis while causing the fluid to flow out from multiple locations in the inflow path,
The fluid is discharged like a shower from the end of the inflow channel located at the top inside the tank body,
A method for eliminating temperature unevenness in a tank, characterized by:

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