JP2546072Y2 - Submerged vertical steam condenser - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a submerged vertical steam condensing apparatus, and more particularly to a method for efficiently condensing steam using stored water.

[0002]

2. Description of the Related Art FIG. 3 shows a conventional example of a vertical steam condensing apparatus used in a petrochemical plant or a nuclear power plant. The steam condensing device is a kind of a tube-type heat exchanger, and a heat exchange chamber 3 is formed by dividing a vertical cylindrical main body 1 by a pair of upper and lower tube sheets 2.
A plurality of heat transfer tubes 4 are inserted into the heat exchange chamber 3, and extend vertically between a pair of tube sheets 2. At both ends of the body 1, a base casing 5 is attached to form an inlet plenum 6 and an outlet plenum 7 for communicating with the heat transfer tube 4.
The inlet plenum section 6 and the outlet plenum section 7 are provided with an in-pipe fluid inlet 8 and an in-pipe fluid outlet 9, and the main body 1 has an in-pipe fluid inlet 10 and an in-pipe fluid. This is a structure in which an outlet 11 is provided.

In such a vapor condensing apparatus, a high-temperature first fluid to be condensed flows into the heat transfer tube 4 as shown by a solid line arrow in FIG. Is flowed as shown by a broken-line arrow, thereby performing heat exchange in the heat exchange chamber 3 to convert the first fluid into a condensed liquid.

[0004]

However, in a steam condensing apparatus, the first fluid is supplied to supply the first fluid.
Since the fluid is condensed, it is necessary to install a liquid transfer pump for supplying and discharging the second fluid, a storage tank for the discharged liquid, and the like in order to efficiently supply and discharge the fluid. Further, when the purpose of use of the steam condensing device is, for example, for cooling steam generated in large quantities at the time of occurrence of an accident in the above-described plant, a large facility for transferring or circulating the second fluid for cooling is provided. You will need it.

The present invention has been made in view of these circumstances, and simplifies the supply and discharge of a cooling medium, omits a drive source for supplying and discharging a cooling medium, and uses a large amount of steam. The purpose is to carry out condensation efficiently.

[0006]

As means for solving the above problems, there is provided a vertical container having a large upper inner diameter which is arranged submerged in the storage water of a water storage tank, and is vertically separated in the vertical container. A pair of tube sheets arranged in a state and defining a heat exchange chamber, a plurality of heat transfer tubes arranged in a state of being bridged between the pair of tube sheets, and a water tank arranged at a lower position and an upper position of the heat exchange chamber. And a submerged vertical steam condensing device having a storage water inlet and a fluid outlet communicating with the water.

[0007]

[Function] The vertical container is submerged,
There is always a state in which the water stored in the water storage tank exists inside the heat exchange chamber. When the first fluid in the high temperature state is sent to the heat transfer tube, cooling is performed by heat exchange with the second fluid in the low temperature state, which is stored water, and when the first fluid is steam, the first fluid is condensed. It liquefies by cooling to the same. The second fluid is heated by the heat exchange, rises along the heat transfer tube, is discharged into the storage water from the fluid outlet at the upper part of the heat exchange chamber, and the stored water flows into the heat exchange chamber from the storage water inlet. I do. The discharge and the inflow of these second fluids are performed by natural convection.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a submerged vertical steam condensing apparatus according to the present invention will be described below with reference to FIGS. 1 and 2, the same reference numerals are given to parts common to the respective parts of the above-described conventional steam condensing apparatus, and the description will be simplified.

The submerged vertical steam condensing apparatus according to the embodiment is an example of a facility for rapidly condensing steam when a large amount of steam (vapor) is generated at the time of occurrence of an accident in the above-mentioned plant. , Vertical container (body body)
1, in which a pair of tube sheets 2, a heat exchange chamber 3, a plurality of heat transfer tubes 4, a base casing 5 and the like are provided, they have portions common to the prior art example, as shown in FIG. The vertical container (body part) 1 basically stores the stored water W in the water storage tank 20.
It is arranged in a submerged state.

As shown in FIG. 1, the vertical container 1 is formed in a tapered tube whose upper portion is widened so that the inner diameter of the side wall portion gradually increases upward.
The rigidity is increased, and it is erected on the support structure 21 via the base casing 5.

At a lower position and an upper position of the heat exchange chamber 3 formed in the vertical container 1, a storage water inlet 22 and a fluid outlet 23 communicating with the storage water W inside the water storage tank 20 are provided.
Is arranged.

As shown in FIG. 2, a seismic device 24 such as a shear lug mechanism is disposed between the vertical container 1 and the upper tube sheet 2 at, for example, four locations with a circumferential interval. Being
With these combinations, the vertical movement is allowed, and consideration is given to suppressing the roll.

Therefore, the base casing 5 in the lower position
Each of the heat transfer tubes 4, the tube plate 2, the upper casing 5 and the baffle plate 20 mounted on the
It has a self-supporting structure that can be extended and contracted vertically. The in-pipe fluid inlet 8 is connected to a supply pipe or the like for the first fluid (in-pipe fluid) through the flexible joint 25 so as to be not affected by vibration or the like.

The storage water inlet 22 and the fluid outlet 2
3 is set to communicate directly with the storage water W,
The portion of the fluid outlet 23 is, as shown in FIG.
In the annular space formed between the base casing 5 (or the tube sheet 2) and the seismic device 24, the fluid outlet 23 is provided at a plurality of locations. In FIG. 1, the symbol X is a tube bundle, which means an assembly of the heat transfer tubes 4.

In the submerged steam condensing apparatus having the above-described structure, when the vapor to be condensed (the high-temperature first fluid) is transferred, the first fluid is supplied by a solid arrow in FIG. As shown by, by flowing in order from the inlet for pipe fluid 8 to the inlet plenum 6, the interior of each heat transfer tube 4, the outlet plenum 7, and the outlet for pipe fluid 9, condensation occurs based on heat exchange in the heat exchange chamber 3. Then, a process of discharging the condensed liquid from the in-pipe fluid outlet 9 is performed.

In this case, as indicated by the dashed arrow in FIG. 1, the low-temperature second fluid (reserved water W) rises in temperature and expands with the heat exchange in the heat exchange chamber 3. A draft force (rising force) is generated, the second fluid in a high-temperature state is discharged from the fluid outlet 23 to the stored water W of the water storage tank 20, and circulation is performed in which the stored water W is taken in from the stored water inlet 22. .

That is, the second fluid uses the fact that the stored water W is stored in a large amount and has a large heat capacity to guide the steam passing through the heat transfer tube 4 to a condensed state. The storage water W in the low temperature state is sequentially taken into the heat exchange chamber 3 and is expanded by being heated by heat exchange with the first fluid, and depending on the amount and temperature of the first fluid, the second fluid Is vaporized, but even in that case, based on the side shape of the vertical container 1, the fluid and the vapor after the heat exchange are discharged to the outside of the tube bundle X and rise, The fluid is discharged from the fluid outlet 23 into the stored water W, and the vapor component is returned to the condensed state by the stored water W again. Then, even when the second fluid is vaporized by heat exchange inside the tube bundle X, when the vapor reaches the lower surface of the tube sheet 2, it is guided outward from the center along the lower surface shape. Then, the fluid is discharged from the upper part of the heat exchange chamber 3 by the fluid outlet 23.

In this case, the amount of the vapor of the second fluid is sequentially guided outward from the inside of the tube bundle X based on the side shape of the vertical container 1, so that the amount of vapor in the range of the tube bundle X is reduced. If the state in which the liquid amount of the second fluid is large is maintained, for example, all the vapor is not sent to the upper part of the tube bundle X, the amount of vapor reaching the upper part of the tube bundle X Is reduced and the void ratio (volume ratio) of the vapor is reduced, so that the phenomenon that the vapor stays near the upper portion of the heat transfer tube 4 is suppressed.

For this reason, by supplying the second fluid from below to above and quickly discharging the vapor or the high temperature fluid from the tube bundle X, the temperature in the vicinity of the connection point between the tube sheet 2 and the heat transfer tube 4 is averaged. Thus, the occurrence of vapor blanketing is prevented, and the local overheating of only a part of the tube sheet 2 and the heat transfer tube 4 is suppressed.

In the present invention, the following technique can be adopted instead of the above-described embodiment. (1) The upwardly expanding shape above the vertical container 1 is arbitrary. For example, the side portion has a corrugated cross section. (2) The shape and opening position of the stored water inlet 22 and the fluid outlet 23 are arbitrary.

[0021]

As described above, according to the immersion-type steam condensing apparatus according to the present invention, heat exchange is provided in a vertical container which is arranged submerged in the storage water of the water storage tank and has a large upper inner diameter. Since a pair of tube sheets, a plurality of heat transfer tubes, and a stored water inlet and a fluid outlet communicating with the inside of the water storage tank are provided, the following excellent effects can be obtained. (1) Since the stored water is used as a cooling medium and the fluid that has become hot due to heat exchange is returned to the stored water, a large amount of steam can be condensed, and the supply and discharge of the cooling fluid is simplified. Can be (2) Since the cooling fluid is replaced by natural circulation, a drive source is not required for supply and discharge, and the overall structure can be simplified, and
It is possible to reliably condense the vapor in an emergency or the like. (3) Fluid or vapor heated to a high temperature by heat exchange with the heat transfer tube is guided outward from the center portion based on the shape of the vertical container during the ascent, and the amount of vapor in the range of the tube bundle is reduced. Thereby, heat exchange efficiency can be increased and a large amount of steam can be efficiently condensed. (4) The strength of the side wall can be increased by a vertical container having a large upper inner diameter, and the whole can be made a self-supporting structure to improve the earthquake resistance when submerged in stored water.

[Brief description of the drawings]

FIG. 1 is a front sectional view showing one embodiment of a submerged steam condenser according to the present invention.

FIG. 2 is a view taken in the direction of arrows BB in FIG.

FIG. 3 is a front sectional view showing a conventional example of a vertical type steam condensation apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vertical container 2 Tube plate 3 Heat exchange chamber 4 Heat transfer tube 5 Base casing 6 Inlet plenum part 7 Outlet plenum part 8 Inlet for pipe fluid 9 Outlet for pipe fluid 20 Water storage tank 21 Support structure 22 Reservoir water inlet 23 Fluid outlet 24 Seismic device 25 Flexible joint part X Tube bundle W Reservoir

Claims (1)

(57) [Scope of request for utility model registration] 1. A vertical container arranged in a state of being immersed in the storage water of a water storage tank and having a large upper inner diameter, and a pair of vertical containers arranged in the vertical container and vertically separated from each other to form a heat exchange chamber. And a plurality of heat transfer tubes arranged in a state of being bridged between the pair of tube sheets, and a stored water inlet and a fluid outlet which are arranged at a lower position and an upper position of the heat exchange chamber and communicate with the inside of the water storage tank. Submerged vertical steam condensing device characterized by performing.