KR101645454B1 - Recovery device of waste heat - Google Patents

Abstract

The waste heat recovering apparatus according to the present invention includes: an upper housing in which waste heat moves inward; a hot water generator including an economizer accommodated in the upper housing to generate hot water by heating cold water drawn from the outside with waste heat; A preheating unit including a lower housing installed in the lower part of the hot water generating unit and moving waste heat to the inside and a preheating tube housed inside the lower housing and preheating hot water supplied from the economizer using waste heat; A dewatering unit installed annularly at a joining portion between the hot water generating unit and the preheating unit to remove water contained in the steam supplied from the preheating pipe by centrifugal force; A superheating unit installed inside the upper housing or the lower housing to heat the steam supplied from the dehydrating unit to waste heat; First and second third connection pipes connecting the economizer, the preheating part and the superheating part to form a passage for moving water and steam; And a discharge pipe for discharging the superheated steam from the superheating unit to the outside. According to the waste heat recovering apparatus of the present invention, since the fluid moves sequentially through the economizer, the preheating pipe, and the superheating unit, the extended heat exchange length and area can be ensured and the heat exchange efficiency with the waste heat can be improved.

Description

[0001] Recovery device of waste heat [0002]

The present invention relates to a waste heat recovery apparatus, and more particularly, to a waste heat recovery apparatus for recovering waste heat by heating a fluid using waste heat.

Waste heat is energy that can not be used in heat generation and facilities, and it is abandoned energy.

In particular, the steel industry uses a large amount of energy due to the high number of processes requiring high temperature, and therefore, a lot of waste heat is generated. Therefore, measures to reduce energy consumption by improving the energy utilization efficiency through recovering waste heat are essential.

For this reason, various waste heat recovering apparatuses using waste heat generated in steel making have been developed. One of them is a waste heat recovering apparatus that obtains moisture and steam by using waste heat released when the iron produced by the steel making platform is air- .

As a technology relating to the waste heat recovering device as described above, Korean Utility Model Registration Utility Model No. 20-0338231 (Jan. 14, 2004) is disclosed. Here, a superheater, a primary evaporator, a secondary evaporator, a high-pressure vacuum cleaner, and a low-pressure cutter are sequentially stacked in the boiler body, and each pipe is connected to the outside of the main body. And the air is passed through a duct to the inside of the boiler to produce steam and hot water.

However, the conventional waste heat recovery apparatus for a sinter plant has a problem that since the superheating unit, the first evaporator, the second evaporator, the high pressure absorber, and the low pressure steamer are laminated, the heat exchange area between the fluid and the waste heat is small, There is a problem that the waste heat can not be uniformly transmitted to the fluid.

Further, there is a problem that the internal structure is arranged in a tandem manner, resulting in an increase in installation space due to the enlargement of the apparatus.

The present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to improve the heating structure in the waste heat recovery apparatus to secure a wider heat exchange area and to improve the heat exchange performance of the waste heat recovery apparatus, It has its purpose.

According to an aspect of the present invention, there is provided an apparatus for recovering waste heat, comprising: an upper housing in which waste heat moves inward; an economizer for generating hot water by heating cold water introduced from the outside into waste heat; A hot water generating unit including the hot water generating unit; A preheating unit including a lower housing installed in the lower part of the hot water generating unit and moving waste heat to the inside and a preheating tube housed inside the lower housing and preheating hot water supplied from the economizer using waste heat; A dewatering unit installed annularly at a joining portion between the hot water generating unit and the preheating unit to remove water contained in the steam supplied from the preheating pipe by centrifugal force; A superheating unit installed inside the upper housing or the lower housing to heat the steam supplied from the dehydrating unit to waste heat; First and second third connection pipes connecting the economizer, the preheating part and the superheating part to form a passage for moving water and steam; And a discharge pipe for discharging the superheated steam from the superheating unit to the outside.

The preheating unit includes a lower housing having a skirt shape having a wider width toward the lower part, a preheating tube accommodated in the lower housing and having a dome shape rotated a plurality of times by a spiral, And may include a plurality of supports arranged along the circumferential direction to support and fix the preheated tube in the vertical direction.

The superheating unit may include a first superheating unit for superheating the moisture and steam supplied from the dehydrating unit to waste heat, a second superheating unit connected to the first superheating unit at a lower portion of the first superheating unit, And a second superheating unit that reheats the received superheated steam to waste heat.

The economizer, the first superheating unit, and the second superheating unit each have an inlet tube, an outlet tube spaced apart from the inlet tube, and an outlet tube communicating with the inlet tube and the outlet tube. The plurality of bending tubes And one or a plurality of heating pipes. Preferably, the economizer, the first superheating unit, and the second superheating unit are disposed in parallel so that the plurality of heating pipes communicate with each other.

And the second superheating unit is installed in the inner space of the preheating tube.

According to the waste heat recovering apparatus of the present invention, the following effects can be obtained.

First, since the fluid moves sequentially through the economizer, the preheating tube, and the superheating portion, the expanded heat exchange length and area can be secured, and the heat exchange efficiency with the waste heat can be improved.

Second, since the preheating section has a dome shape, the retention time of the waste heat is increased to improve the heat exchange efficiency of the preheating section, and the waste heat surrounds the superheating section provided in the inner space of the preheating section, The efficiency can be further improved.

Third, it is possible to maximize the space utilization efficiency of the apparatus by installing the superheating unit in the inner space of the preheating unit.

1 is a perspective view of a waste heat recovery apparatus according to an embodiment of the present invention,
FIG. 2 is a partial perspective view showing the internal structure of the waste heat recovery apparatus shown in FIG. 1,
FIG. 3 is a partial perspective view showing the endurance structure shown in FIG. 2 except for the preheating tube,
4 is a perspective view showing another embodiment of the economizer, the first superheating unit and the second superheating unit shown in FIG.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concepts of the terms appropriately The present invention should be construed in accordance with the meaning and concept consistent with the technical idea of the present invention.

Therefore, the embodiments described in the present specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention, and not all of the technical ideas of the present invention are described. Therefore, at the time of the present application, It should be understood that variations can be made.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a perspective view of a waste heat recovery apparatus 10 according to an embodiment of the present invention, FIG. 2 is a partial perspective view showing the internal structure of the waste heat recovery apparatus shown in FIG. 1, And is a partial perspective view showing a state where the preheating pipe 220 is removed.

Referring to FIGS. 1 to 3, the waste heat recovery apparatus 10 according to the embodiment of the present invention is an apparatus for producing superheated steam at a high temperature by using heated waste heat to overheat the hot water. The waste heat recovering apparatus 10 includes a hot water generating unit 100, a preheating unit 200, a dehydrating unit 300, a superheating unit 400, and a discharge pipe 600. As the waste heat, for example, a large amount of waste heat generated in a steel making process may be used, but is not limited thereto.

The hot water generating unit 100 includes an upper housing 110 having a cylindrical shape and moving waste heat to the inside thereof as shown in the figure, and cold water received in the inside of the upper housing 110, And an economizer 120a for generating hot water.

The preheating unit 200 includes a lower housing 210 installed at a lower portion of the hot water generating unit 100 and moving waste heat to the inside and a lower housing 210 housed inside the lower housing 210, A preheating tube 220 for preheating the supplied hot water using waste heat and a plurality of supports 230 for supporting and fixing the preheating tube 220. At this time, the lower housing 210 is formed in a skirt shape having a wider width as it goes down, and may be attached to the lower part of the upper housing 110. Also, the preheating tube 220 is housed inside the lower housing 210, and is preferably turned in a plurality of turns by a spiral to have a dome shape. At this time, the lower end of the preheating tube 200 and the economizer 120a are connected to the first connection pipe 510. The fluid supplied from the economizer 120a flows into the lower part of the preheating tube 220, And moves up the tube 220. Further, the plurality of supports 230 support and fix the preheating tube 220 in the vertical direction, and are disposed along the circumferential direction. At this time, the plurality of supports 230 are formed in an arc shape, and it is easy for the preheating tube 220 to be turned to have a dome shape. Further, holes may be formed in the plurality of support members 230 so as to pass through the preheating pipe 220, but the present invention is not limited thereto.

1, the dewatering unit 300 is provided in a donut shape at a joining portion between the hot water generating unit 100 and the preheating unit 200, and the moisture and steam supplied from the preheating pipe 220, Thereby inducing the removal of water by the centrifugal force.

Referring to FIGS. 2 and 3, the superheating unit 400 may include a first superheating unit 410a and a second superheating unit 420a. The first superheating unit 410a is connected to the dehydrating unit 300 and the third connecting pipe 530, and receives moisture and steam to overheat the waste heat. The second superheating unit 420a is connected to the first superheating unit 410a at a lower portion of the first superheating unit 410a and the superheated steam supplied from the first superheating unit 410a is used as waste heat As shown in FIG. At this time, it is preferable that the first superheating unit 410a and the second superheating unit 420a are connected to the third connection pipe 530 so that the steam can move. 1, the first superheating unit 410a is installed inside the upper housing 110 or the lower housing 210 and the second superheating unit 420a is installed inside the lower housing 310 . More specifically, as shown in FIG. 2, the second superheating unit 420a is accommodated in a dome-shaped internal space formed by the preheating pipe 220 inside the lower housing 310 desirable.

The discharge pipe 600 is provided at one side of the second superheating units 420a and 420b to discharge the superheated steam from the second superheating units 420a and 420b to the outside.

The first connection pipe 510, the second connection pipe 520, the third connection pipe 530 and the discharge pipe 600 may further include a check valve (not shown) It can be adjusted to flow in one direction and prevent backflow.

3, the economizer 120a, the first superheating unit 410a, and the second superheating unit 420a may be connected to the inlet pipes 122, 412, and 422 as described above, An outlet pipe 123, 413 and 423 spaced apart from the inlet pipe 122, 412 and 422, and an inlet pipe 122, 412 and 422 and an outlet pipe 123 413 and 423 and a plurality of bending pipes 124, 414 and 424 bent in a wave form and connected to the heating pipes 121, 411 and 421, respectively. By providing the heating pipes 121, 411, and 421 as described above, the heat exchange area between the fluid and the waste heat can be widened and the overall waste heat collection rate can be increased.

On the other hand, in order to further increase the heat exchange area between the fluid and the waste heat, it is possible to introduce a heat exchange concept having an expanded area. To this end, FIG. 4 shows another embodiment of the economizer, the first superheating unit and the second superheating unit shown in FIG. Here, the same reference numerals as those shown in Figs. 1 to 3 denote the same components having the same constitution and effects, and repetitive description will be omitted.

4, the economizer 120b equipped with the hot water heating unit 100 and the first superheating unit 410b and the second superheating unit 420b provided in the superheating unit 400 may be provided with the plurality of The heat pipes 121, 411, and 421 may be arranged in parallel to each other to expand the heat exchange area.

According to the waste heat recovery apparatus 10 of the present invention as described above, since the fluid moves sequentially through the economizer 120a 120b, the preheating tube 220, and the superheating unit 400, the extended heat exchange length and area Therefore, the heat exchange efficiency with the waste heat can be improved. In addition, since the preheating section 200 has a dome shape, the retention time of the waste heat is increased to improve the heat exchange efficiency of the preheating section 200, The heat exchanging efficiency of the superheating unit 400 can be further improved. In addition, since the superheating unit 400 is accommodated in the inner space of the preheater 200, space utilization efficiency of the apparatus can be maximized.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

10: waste heat recovery device 20: heat source
100: hot water generator 110: upper housing
120a, 120b: Economizer 122, 412, 422:
123, 413, 423: outlet pipes 124, 414, 424:
121, 114, 421: Heating pipe 200:
210: lower housing 220: preheating tube
230: Support body 300: Dewatering unit
400: superheating part 410a, 410b: first superheating part
420a, 420b: second superheating part 510: first connection pipe
520: second connector 530: third connector
600: discharge pipe

Claims (6)

A hot water generator including an upper housing in which waste heat moves to the inside of the upper housing, and an economizer for generating hot water by heating the cold water drawn from the outside with waste heat;
A lower housing provided at a lower portion of the hot water generating portion and adapted to move waste heat to the inside and a preheating tube accommodated inside the lower housing and preheating hot water supplied from the economizer using waste heat, ) Shaped space;
A dewatering unit installed annularly at a joining portion between the hot water generating unit and the preheating unit to remove water contained in the steam supplied from the preheating pipe by centrifugal force;
A superheating unit disposed in the space inside the preheater to receive at least a portion thereof and to superheat the steam supplied from the dehydrating unit to waste heat;
First and second third connection pipes connecting the economizer, the preheating part and the superheating part to form a passage for moving water and steam; And
And a discharge pipe for discharging the superheated steam from the superheating unit to the outside. The method according to claim 1,
The pre-
A lower housing of a skirt shape having a wider width toward the lower portion,
A preheating tube housed inside the lower housing and having a dome shape rotated by a plurality of turns by a spiral,
And a plurality of supporters disposed in the circumferential direction for vertically supporting and fixing the preheating tube rotated a plurality of times. The method of claim 2,
The over-
A first superheating unit for superheating the steam supplied from the dehydrating unit to waste heat,
And a second superheating unit connected to the first superheater at a lower portion of the first superheater and for superheating superheated steam supplied from the first superheater to waste heat. The method of claim 3,
The economizer, the first superheating unit, and the second superheating unit each have an inlet pipe, an outlet pipe spaced apart from the inlet pipe, and a plurality of bending pipes bent in a wave form by connecting the inlet pipe and the outlet pipe, And one or a plurality of heating pipes provided therein. The method of claim 4,
The economizer, the first superheating unit and the second superheating unit are
Wherein the plurality of heating pipes are arranged in parallel so as to communicate with each other. The method of claim 3,
And the second superheating unit is installed in an inner space of the preheating tube.

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