KR101966930B1 - Heat exchanger using flash evaporation and steam generator having the same - Google Patents

Abstract

The present invention relates to a heat exchanger using instantaneous evaporation, comprising: a first heating flow path which is changed into a saturated liquid by single-phase heat exchange while passing a heated liquid through which heat is transferred from the heat transfer medium; An evaporation flow path that instantly changes state to a saturated gas by instantaneous evaporation due to a pressure drop while passing a saturated liquid through which heat is transferred from the medium and a saturated gas which communicates with the instantaneous evaporation flow passage and receives heat from the heat transfer medium, And a second plate having a first plate having a second heating channel heated and discharged by heat exchange and a second plate provided on a lower side or a lower side of the first plate and having a heat transfer medium passage through which the heat transfer medium passes .

Description

TECHNICAL FIELD [0001] The present invention relates to a heat exchanger using instantaneous evaporation and a steam generator having the same. [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger using instantaneous evaporation and a steam generator having the same, and more particularly, to a heat exchanger using instantaneous evaporation which enables a more stable heat exchange process by omitting a two- .

Typical types of heat exchangers are plate-type heat exchangers and plate heat exchangers.

Plate heat exchangers have been extensively applied in the industry for over 100 years, and generally they are extruded to form a flow channel and the plates are joined using gaskets or general welding or brazing. Plate heat exchangers are similar in application to the plate heat exchangers, but are used more and more in low pressure and low pressure environments. The heat exchange performance is smaller than the printing plate heat exchanger and is superior to the shell and tube heat exchanger. In addition, compared to a plate-type heat exchanger of a printing plate, there is a characteristic of being easy to manufacture.

The printing plate heat exchanger has been developed by Heatric Corporation in England and has been widely used in general industrial fields. It has been used in a dense flow path arrangement and diffusion bonding technique by photochemical etching technique, . Accordingly, the plate-type heat exchanger of the printing plate is applicable to the high-temperature and high-pressure environment by adopting the structure in which the plate-to-plate weld in the plate heat exchanger is eliminated, and has high integration and excellent heat exchange performance. Plate Heat Exchanger Durability to high temperature and high pressure environment and excellent heat exchange performance with high degree of integration makes it possible to use evaporator, condenser and cooler such as cooling and heating system, fuel cell, automobile, chemical process, medical device, , Radiators, heat exchangers, and semiconductors.

However, in the conventional plate-type or plate-type heat exchanger, there is a problem that the flow instability in which the boundary portion vibrates in the phase change section, fouling in which scale and metal oxide are generated in the tube and heat transfer performance is lowered have. At this time, flow instability and fouling occur particularly well in the section where two phase heat transfer occurs.

Korean Patent Publication No. 10-1534497

SUMMARY OF THE INVENTION In order to solve the above problems, an object of the present invention is to eliminate the conventional two-phase heat exchange process by causing the saturated liquid to change state to a saturated gas by instantaneous evaporation according to the pressure drop due to an instantaneous increase in the cross- To thereby reduce flow instability and fouling, and to provide a heat exchanger using instantaneous evaporation.

Also, the present invention provides a heat exchanger using instantaneous evaporation, which causes the possibility of use as a separate heat source by recovering a saturated liquid that has not been changed to a non-saturated gas during the instantaneous evaporation process through a heat recovery flow path.

Another object of the present invention is to provide a steam generator capable of stably generating steam by providing a heat exchanger using instantaneous evaporation.

A heat exchanger using instantaneous evaporation according to an embodiment of the present invention includes a first heating flow path through which a heated liquid that receives heat from a heat transfer medium passes and is changed into a saturated liquid by single phase heat exchange, An evaporation flow path that instantly changes state to a saturated gas by instantaneous evaporation due to a pressure drop while passing a saturated liquid through which heat is transferred from the heat transfer medium and a saturated gas which communicates with the instantaneous evaporation flow passage and receives heat from the heat transfer medium A first plate having a second heating channel which is heated and discharged by a single phase heat exchange; And a second plate provided on an upper side or a lower side of the first plate and having a heat transfer medium passage through which the heat transfer medium passes.

Meanwhile, the steam generator according to the embodiment of the present invention includes a heat exchanger using instantaneous evaporation.

As described above, the heat exchanger using the instantaneous evaporation according to the present invention changes the state of the saturated liquid to the saturated gas by the instantaneous evaporation according to the pressure drop due to the instantaneous increase in the cross-sectional area of the flow passage, The process is skipped to reduce flow instability and fouling.

In addition, the heat exchanger using instantaneous evaporation according to the present invention generates a possibility of being used as a separate heat source by recovering the saturated liquid which has not undergone the state change to the non-saturated gas during the instant evaporation process through the heat recovery flow path.

In addition, the steam generator having the heat exchanger using the instantaneous evaporation according to the present invention enables stable steam generation.

1 is a perspective view of a heat exchanger according to an embodiment of the present invention.
2 is an exploded perspective view of the heat exchanger shown in Fig.
FIG. 3 is a view for explaining a fluid movement and a heat exchange process of the heat exchanger shown in FIG. 1. FIG.
FIG. 4 is a Ts diagram of the second order water flow used in the steam generator for supplementing the fluid movement and heat exchange process shown in FIG. 3. FIG.

The accompanying drawings in the present invention may be exaggerated for clarity, clarity, and descriptive convenience. In addition, since the following terms are defined in consideration of the functions of the present invention, they may vary depending on the intention or custom of the user or the operator, and therefore the definition of these terms should be based on the technical contents throughout this specification will be. On the contrary, the embodiments are merely illustrative of the constituent elements set forth in the claims of the present invention and do not limit the scope of the present invention, and the scope of the rights should be interpreted on the basis of technical ideas throughout the specification of the present invention .

FIG. 1 is a perspective view of a heat exchanger according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of the heat exchanger shown in FIG. 1, and FIG. 3 is a view for explaining a fluid movement and heat exchange process of the heat exchanger shown in FIG. And FIG. 4 is a Ts diagram of the second order water flow used in the steam generator for supplementing the fluid movement and heat exchange process shown in FIG.

Referring to FIGS. 1 to 4, a heat exchanger using instantaneous evaporation according to an embodiment of the present invention includes a first plate 100 and a second plate 200.

The first plate 100 includes a first heating channel 111a, an instantaneous evaporation channel 112a, and a second heating channel 113a. In addition, the first plate 100 may further include a heat recovery flow path 121.

The first heating channel 111a is a channel that changes state to a saturated liquid by a single phase heat transfer while passing a liquid to be heated which receives heat from the heat transfer medium.

The instantaneous evaporation passage 112a communicates with the first heating passage 111a through which heat is transferred from the heat transfer medium. The saturated vapor passing through the heat transfer medium passes through the instantaneous evaporation passage 112a, It is a changing euro. Specifically, the instantaneous evaporation flow path 112a is a state in which the saturated liquid generated through the first heating flow path 111a is converted into a saturated state without two-phase heat transfer using Flash evaporation Sectional area of the first heating flow path 111a (the flow path surface area means the sum of the cross-sectional areas when a plurality of first heating flow paths 111a are provided). In this case, the size of the cross-sectional area can be set experimentally to the extent that instantaneous evaporation occurs.

The second heating passage 113a communicates with the instantaneous evaporation passage 112a and is heated and discharged by a single-phase heat exchange while passing a saturated gas that receives heat from the heat transfer medium. In this case, if the length of the second heating passage 113a is short, it is mostly discharged to the saturated gas, and if the length of the second heating passage 113a is long, most of it will be discharged to the superheated gas.

The heat recovery flow path 121 communicates with the instantaneous evaporation flow path 112a so that the heated liquid left in the saturated liquid state in the instantaneous evaporation flow path 112a flows back toward the inlet port side of the first heating flow path 111a And is a flow path provided below the first heating passage 111a.

The first plate 100 includes a plurality of plates that are specifically subdivided in order to have a first heating channel 111a, a second heating channel 112a, a third heating channel 113a, and a heat recovery channel 121 .

That is, the first plate 100 includes the first heating passage 111a, the instantaneous evaporation passage 112a, the upper plate 110 on which the second heating passage 113a is formed, And a lower plate 120 provided below the heat recovery flow path 110 and formed with the heat recovery flow path 121.

2, the upper plate 110 includes an inlet 111 formed in a generally rectangular shape and a plurality of first heating channels 111a formed on the upper surface along the longitudinal direction, , The instantaneous evaporation flow path (112a) is extended to communicate with the first heating flow path (111a) and has a flow path cross-sectional area larger than the flow path cross-sectional area of the first heating path (112a) And a discharge part 113 formed in the upper surface in such a manner that a plurality of the second heating path 113a are communicated with the instantaneous evaporation path 112a along the longitudinal direction, .

In this case, it is assumed in FIGS. 1 to 3 that the first heating passage 111a and the second heating passage 113a are provided at two positions, but they may have a predetermined cross sectional area, In addition, it is possible to set the sectional area of the instantaneous evaporation flow path 112a by calculating the total cross-sectional area of the passage even in the modified configuration within the even range. (For example, by adjusting the overall height of the upper plate 110 or adjusting the length of the instantaneous evaporation flow path 112a to set the cross-sectional area and volume of the flow path so that the instantaneous evaporation occurs, the instantaneous evaporation flow path 112a ) To allow instantaneous evaporation to take place.

The bottom plate 120 is formed to have a generally rectangular shape and the heat recovery flow path 121 starts from the position of the inlet port of the second heating flow path 121 And may be formed on the upper surface so as to open toward the inlet side of the flow path 111a.

When the second plate 200 is disposed on the lower side of the first plate 100, the first plate 100 includes a first cover plate 130 disposed on the upper side of the upper plate 110, And the like.

The upper plate 110, the lower plate 120, and the first cover plate 130 are plate-type heat exchangers in which individual channels are formed by a photochemical etching method and laminated in a diffusion bonding manner between the plates. Is preferably produced by a production method of a group. Such a manufacturing method is particularly preferable when the heat exchanger is used in a steam generator which is required to secure rigidity that can withstand high pressure fluid pressure. It is needless to say that the respective plates may be formed in a structure in which a plurality of plates are laminated instead of one plate.

The upper plate 110, the lower plate 120, and the first cover plate 130 are formed by simultaneously forming a flow channel while extruding individual plates, and a plate heat exchanger Of the present invention can be manufactured by a manufacturing method of the present invention.

The second plate 200 is provided on the upper side or the lower side of the first plate 100 and includes a heat transfer medium flow path 201 through which the heat transfer medium passes.

Hereinafter, a case where the second plate 200 is provided below the first plate 100 will be described in detail.

The heat transfer medium passing through the heat transfer medium flow path 201 is separated from the heat transfer medium flow path 201 by the first heating flow path 111a, the instantaneous evaporation flow path 112a, ) And sequentially heats the liquid to be heated, the phase of which changes. Further, the heat transfer medium heats the saturated liquid flowing backward through the heat recovery flow path 121, thereby causing the possibility of use as a separate heat source.

The second plate 200 is a plate type heat exchanger in which the heat transfer medium flow path 201 is formed by a photochemical etching method and is laminated and bonded to the first plate 100 in a diffusion bonding manner . ≪ / RTI > Such a manufacturing method is particularly preferable when the heat exchanger is used in a steam generator which is required to secure rigidity that can withstand high pressure fluid pressure. In addition, it is needless to say that the second plate 200 may be formed by stacking a plurality of plates, not a single plate.

1 to 3, it is assumed that there are two heat transfer medium flow paths 201. However, it is needless to say that the heat transfer medium flow paths 201 may have a predetermined cross sectional area and may be provided at one or three or more.

It is preferable that the heat transfer medium flow path 201 is formed at the same position and at the same position vertically and at the same width as the first heating flow path 111a and the second heating flow path 113a for effective heat transfer.

On the other hand, the heat transfer medium passing through the heat transfer medium flow path 201 may be configured as a countercurrent to the heated liquid flowing into the first heat transfer path 111a. That is, the mutual flow of the heat transfer medium and the liquid to be heated may be reversed.

In this countercurrent structure, since the heat transfer medium flows from the second heating passage 113a side to the first heating passage 111a side and provides heat and loses its own heat, the heat transfer medium flows back through the heat recovery passage 121 and is recovered The liquid to be heated in the saturated liquid state is an auxiliary heat source for transferring heat to the liquid to be heated in the first heating passage 111a together with the heat transfer medium.

When the second plate 200 is provided on the upper side of the first plate 100, the first plate 100 is connected to the first heating passage 111a, the instantaneous evaporation passage 112a, An upper plate 110 on which the second heating channel 113a is formed and a lower plate 120 on the lower side of the upper plate 110 and on which the heat recovery channel 121 is formed, The plate 200 may include a separate second cover plate (not shown) provided on the upper side thereof.

In addition, the heat exchanger including the first plate 100 and the second plate 200 may be used as a plurality of stacked structures in the vertical direction or a plurality of the heat exchangers may be used in the lateral direction. It can be understood as an example.

On the other hand, the first plate 100 is provided so that the side of the second heating passage 113a is located above the side of the first heating passage 111a, so that the heat recovery passage 112a is communicated with the first heating passage 111a, It is preferable that it is provided so as to be inclined downward in the direction of the inlet port of the inlet 111a.

This is because when the liquid to be heated that remains in the saturated liquid state in the instantaneous evaporation flow path 112a flows backward in the direction toward the inlet port of the first heating flow path 111a, This is to derive the structure.

Even when the second heating flow path 113a side is at the same height as the first heating flow path 111a side, the bottom surface of the instantaneous evaporation flow path 112a is downwardly moved toward the first heating flow path 111a The same effect can be achieved by inclining.

Meanwhile, the steam generator according to the embodiment of the present invention includes the heat exchanger using the instantaneous evaporation as described above.

In this case, considering that the steam generator uses the heat of the first order water to supply the second order water to the turbine and supplies the steam to the turbine, and turns on the turbine using the supplied steam, And the heat transfer medium corresponds to the first order system.

Hereinafter, the fluid movement and heat exchange in the heat exchanger according to the embodiment of the present invention will be described with reference to FIGS. 3 and 4. FIG. (Here, for the sake of simplicity of explanation of the present invention, one of the two points of the flow paths of the first heating passage 111a, the second heating passage 113a and the heat transfer medium passage 201) The same flow is naturally formed in the other one of the flow paths.)

In this case, the heat transfer medium (when the heat exchanger is used as a steam generator, the primary system water) is connected to the first heating flow path 111a, the instantaneous evaporation flow path 112a, and the second heating flow path 113a of the heat transfer medium flow path 201 and the heat transfer medium flow path 201 provided below the heat transfer medium flow path 113a.

First, the liquid to be heated (when the heat exchanger is used as a steam generator, the second system water) flows into the first heating flow path 111a through the inlet of the first heating flow path 111a as shown by the arrow A in FIG. 3, And reaches a point by single-phase heat exchange while moving to the starting point a, and becomes a saturated liquid state. (In the case of using a heat exchanger for a steam generator, as shown in FIG. 4, the process in which the secondary system water is saturated in the state a 'along the line A' is also the same.)

Thereafter, the liquid to be heated passes through the instantaneous evaporation flow path 112a as shown by the arrow B1 in FIG. 3, and is changed to a saturated gas state by the instantaneous evaporation due to the pressure drop, so that the second heating flow path 113a starts To the point b. In this case, a part of the liquid to be heated, as indicated by the arrow B2 in Fig. 3, is not saturated with the saturated gas but remains in the saturated liquid state, falls by gravity, d. (When the heat exchanger is used for the steam generator, as shown in FIG. 4, the secondary system water becomes saturated steam and reaches the state b 'along the line B1', and some saturated water reaches the state d 'along the line B2' The process is the same.)

Thereafter, the portion of the liquid to be heated, which has been changed to the saturated gas state, is heated by the single-phase heat exchange while passing through the second heating flow path 113a as shown by the arrow C in Fig. (When a heat exchanger is used for a steam generator, the process of final discharge after the secondary system water is changed into the c 'state along the line C' is also the same as shown in FIG. 4).

At the same time, the portion of the liquid to be heated which has fallen into the saturated liquid state flows back to the heat recovery flow path 121 provided below the first heating flow path 111a as shown by the arrow D in FIG. 3 and is used as a new heat source . At this time, the saturated liquid that flows backward can be used as an auxiliary heat source for supplementing the heat of the heat transfer medium and heating the heated liquid newly introduced into the first heat transfer path 111a. (When a heat exchanger is used for a steam generator, the process of changing the state of the secondary system water along the line D 'from the c' state is the same as shown in FIG. 4).

As described above, the heat exchanger using instantaneous evaporation according to the present invention reduces flow instability and fouling by using instantaneous evaporation (Falsh evaporation) due to pressure drop due to an instantaneous increase in cross-sectional area, The saturated liquid which has not been changed into a saturated gas can be recovered through the heat recovery flow path, thereby generating a possibility of being used as a separate heat source. In the case of the steam generator, stable steam can be generated.

As described above, the present invention has been described with reference to the embodiments shown in the drawings. However, it should be understood that the present invention is by way of example only and that various modifications and equivalent embodiments are possible on the basis of common knowledge in the art . Therefore, the true technical protection scope of the present invention should be determined based on the specific contents of the above-mentioned invention in accordance with the claims to be described below.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger using instantaneous evaporation and a steam generator having the same, and is applicable to an industrial field (for example, a steam generator) using a heat exchange mechanism between fluids.

100: first plate
110: upper plate
111: inlet
111a: first heating passage
112:
112a: Instantaneous evaporation flow
113:
113a: second heating passage
120: lower plate
121: Heat recovery flow path
130: first cover plate
200: second plate
201: Heat transfer medium flow path

Claims (11)

A first heating passage in which a liquid to be heated which receives heat from the heat transfer medium passes and is changed into a saturated liquid by a single phase heat exchange and a saturated liquid which is in communication with the first heating passage and which receives heat from the heat transfer medium, And a second heating passage which is heated and discharged by a single phase heat exchange while passing through the evaporation flow passage and the saturated gas which is in communication with the instantaneous evaporation flow passage and receives heat from the heat transfer medium, A first plate provided on the first plate; And
And a second plate provided on an upper side or a lower side of the first plate and having a heat transfer medium passage through which the heat transfer medium passes,
Wherein the first plate includes:
Further comprising a heat recovery flow path communicated with the instantaneous evaporation flow path and spaced below the first heating flow path so that the heated liquid remaining in the instantaneous evaporation flow path in the saturated liquid state flows back toward the inflow port side of the first heating flow path .
Wherein the instantaneous evaporation flow path has a flow path cross-sectional area larger than the flow path cross-sectional area of the first heating flow path so that the saturated liquid generated by passing through the first heating flow path can be changed into a saturated gas by using instantaneous evaporation. Heat exchanger using evaporation.
delete The method according to claim 1,
Wherein the heat transfer medium comprises a countercurrent to a liquid to be heated which flows into the first heating channel.
The apparatus of claim 1, wherein the first plate
An upper plate on which the first heating channel, the instantaneous evaporation channel, and the second heating channel are formed; And
A lower plate provided below the upper plate and having the heat recovery flow path formed therein;
Wherein the heat exchanger comprises a plurality of heat exchangers.
5. The apparatus of claim 4,
A first cover plate provided on the upper side of the upper plate when the second plate is provided below the first plate;
Further comprising a second heat exchanger connected to the second heat exchanger.
5. The apparatus of claim 4,
When the second plate is provided on the upper side of the first plate, a second cover plate provided on the upper side of the second plate;
Wherein the heat exchanger comprises a plurality of heat exchangers.
5. The apparatus of claim 4,
An instantaneous evaporation flow path extending from the first heating flow path and being evaporated instantaneously in response to a pressure drop; a plurality of first heating flow paths formed along the lengthwise direction of the first heating flow path, And a plurality of second heating passages formed in communication with the instantaneous evaporative flow passage and formed in a plurality of lengthwise directions on an upper surface thereof, And a discharge portion.
[8] The apparatus of claim 7,
Wherein the heat recovery flow path is formed on the upper surface of the first heat transfer path so that the heat recovery flow path starts from the inlet port position of the second heating flow path and opens to the inlet port side of the first heating flow path.
The method according to claim 1,
Wherein the first plate and the second plate are made of a metal,
Wherein the heat exchanger is manufactured by photochemical etching and diffusion bonding between plates.
The apparatus of claim 1, wherein the first plate
Wherein the second heat transfer path side is located above the first heat transfer path side and the heat recovery flow path is inclined downward toward the inlet direction of the first heating flow path.
A steam generator comprising a heat exchanger according to any one of claims 1 to 10.

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