CN101118136A - Hot plate heat exchanger - Google Patents

Abstract

The invention discloses a hot plate heat exchanger, which relates to a hot plate heat exchanger for recovering high-temperature flue gas waste heat, and aims to provide a hot plate heat exchanger, wherein the aim of the invention is realized by the following technical scheme: a hot plate heat exchanger comprises a core body and partition plates, wherein the core body comprises a plurality of hot plates, the surfaces of the plurality of hot plates are separated by the partition plates, and the plurality of hot plates are divided into an upper medium channel and a lower medium channel; the hot plate consists of a vacuum liquid-filled channel and a connecting pipe. The hot plate heat exchanger has the advantages of large heat transfer area, good temperature uniformity, high structural strength, low manufacturing cost, small volume, light weight and great improvement and improvement on the performance and the cost of the high-temperature heat pipe heat exchanger.

Description

Hot plate heat exchanger

technical field

The hot plate heat exchanger of the invention relates to a heat exchanger, in particular to a hot plate heat exchanger for recovering waste heat from high-temperature flue gas.

Background technique

In existing high-temperature flue gas waste heat recovery devices, if the flue gas temperature is very high (>800°C), most high-temperature heat pipe heat exchangers are used. As the main heat transfer unit of the heat exchanger, the high-temperature heat pipe has the advantages of small temperature difference stress, simple structure, and less susceptible to high temperature damage compared with ordinary heat pipes. However, its high manufacturing cost, complicated processing technology, and waste of energy have become the main factors restricting the development and promotion of high-temperature heat pipe heat exchangers.

Contents of the invention

The purpose of the present invention is to overcome the above-mentioned problems and provide a heat plate heat exchanger, which has a large heat transfer area, good temperature uniformity, high structural strength, low manufacturing cost, small volume, light weight, and The performance and cost of high-temperature heat pipe heat exchangers have been greatly improved and improved.

The purpose of the present invention is achieved through the following technical solutions: a heat exchanger consisting of a core and a partition, the core is composed of several heat plates, the surfaces of the several heat plates are in the middle of the partition Separated and divided into upper and lower medium channels; the hot plate is composed of a vacuum liquid-filled channel and a connecting pipe.

The material of the core body can be aluminum, copper, stainless steel or other materials with good thermal conductivity.

The cross-section of the vacuum liquid-filled channel can be circular, oval, triangular, polygonal, etc., for example, the vacuum liquid-filled channel is a rectangular channel enclosed by upper and lower cover plates, side seals and bottom seals.

As a further improvement of the present invention, fins are provided in the vacuum liquid-filled channel, and the fins can be in the form of sawtooth, porous, or corrugated, and the arrangement of the fins can be arranged horizontally, vertically, or at a certain angle. cloth.

The connecting pipe is used to evacuate the vacuum liquid-filled channel and fill it with working liquid.

As a further improvement of the present invention, several ribs or fins are provided on the surface of the heat plate, so as to enhance the heat transfer in the evaporating section and the condensing section. At this time, the core body is composed of several vacuum liquid-filled passages with fins or fins, wherein the fin passages are divided into cold medium and hot medium passages by a partition to realize countercurrent flow of cold and hot fluids. When in use, the heat exchanger is arranged vertically or inclined at a certain angle to ensure that the working liquid in the vacuum liquid-filled channel can naturally flow back from the cold medium section to the hot medium section.

In the present invention, the vacuum liquid-filled channels with fins are stacked, the hot medium channel and the cold medium channel are arranged side by side, and the working liquid in the vacuum liquid-filled channel undergoes heat transfer through internal phase change, so that a counterflow is formed between the hot fluid and the cold fluid Type flow, has the advantages of good temperature uniformity, large heat transfer area, high structural strength, high heat transfer efficiency, and low cost. Compared with the high-temperature heat pipe heat exchanger, the cost is reduced by 40%, and it is easy to manufacture.

Description of drawings

Fig. 1 is a schematic diagram of the overall structure of Embodiment 1 of the present invention

Fig. 2 is a space sectional view of a ribbed hot plate in Embodiment 1 of the present invention

Fig. 3 is a schematic diagram of the external structure of the heat plate heat exchanger in Embodiment 2 of the present invention

Detailed ways

The present invention is further described below in conjunction with accompanying drawing:

Example 1

Referring to FIG. 1 , the heat plate heat exchanger is composed of a core 100 and a separator 104 . The core 100 consists of several thermal plates 103 . The hot plate 103 is composed of several vacuum liquid-filled passages 102 with ribs or fins 211 , 212 and connecting pipes 101 . The surface of each heat plate 103 is separated by a separator 104 into two upper and lower medium passages, ie a hot medium passage 105 and a cold medium passage 106 , so as to realize the countercurrent flow of hot fluid and cold fluid. At the same time, the partition plate 104 connects several thermal plates 103 as a whole. The connecting pipe 101 is arranged on the upper part of the vacuum liquid-filled channel 102, which is used to evacuate the vacuum liquid-filled channel 102 and fill it with working liquid. The sealing method of the connecting pipe 101 can be welding or sealing pliers, etc., so that it can be completely sealed. method.

Referring to accompanying drawing 2, the vacuum liquid filling channel 102 is provided with a cover plate 221 and a cover plate 222 at the front and back, and a connection pipe 201 is provided at the top, and the cover plate 211 and the cover plate 212 have ribs 211 and 212 . The interior is provided with longitudinally arranged zigzag fins 231 . The connection between the cover plate 221 and the cover plate 222 and the zigzag fins 231 is by vacuum brazing; the connection between the connection pipe 201 and the vacuum liquid-filled channel 102 is by ordinary welding.

When working, the hot plate 103 is arranged horizontally or vertically. The working liquid in the vacuum liquid-filled channel 102 absorbs heat in the section 105 of the hot medium channel, evaporates into steam, and moves to the section 106 of the cold medium channel to condense and release heat to become a liquid. After the heat is transferred to the cold medium, it naturally returns to the hot medium section. The fin structures 211 and 212 increase the heat exchange area of the heat plate heat exchanger and enhance the heat transfer of the heat plate heat exchanger.

Example 2

Referring to accompanying drawing 3, it is a schematic diagram of another shape and structure of the heat plate heat exchanger. The difference between this embodiment and the previous example is that the cold medium side is closed and surrounded by a hollow water jacket 301 on the outside of each hot plate 103, and each water jacket 301 is provided with an inlet and an outlet, and the inlet and outlet are welded. Connecting pipes 311 and 312, the direction of the arrow in Figure 3 indicates the flow direction of the medium, which is generally low in and high out. When working, the cold medium enters the water jacket 301 from the inlet connection pipe 312, and the working liquid in the vacuum liquid-filled channel 102 absorbs heat in the heat medium section 105, evaporates into steam, and moves to the cold medium section 106 to cool the water jacket 301 The medium releases heat and condenses into a liquid at the same time. This reciprocating cycle makes the heat continuously transferred to the cold medium in the water jacket 301. The cold medium in the water jacket 301 absorbs heat and becomes a hot medium to be discharged from the outlet connection 311. The hot plate works in a phase change heat transfer mode, and is also added with fin structures 211 and 212 and a water jacket 301, so the heat transfer efficiency is high.

Claims (10)

1. A hot plate heat exchanger, consisting of a core body and a partition, is characterized in that the core body is made up of several heat plates, and the middle of the surface of the several heat plates is separated by the partition plate, and is divided into upper, upper, and lower parts. The next two medium channels; the hot plate is composed of a vacuum liquid-filled channel and a connecting pipe. 2 . The heat plate heat exchanger according to claim 1 , wherein fins are arranged in the vacuum liquid-filled channel. 3 . 3. The heat plate heat exchanger according to claim 1, wherein the material of the core body is aluminum or copper or stainless steel. 4. The heat plate heat exchanger according to claim 1, characterized in that, the section of the vacuum liquid-filled channel is circular, elliptical, triangular or polygonal in shape, 5. The heat plate heat exchanger according to claim 1, characterized in that several partition plates connect several heat plates into one. 6. The heat plate heat exchanger according to claim 1 or 2, characterized in that several ribs or fins are provided on the surface of the heat plate. 7. The heat plate heat exchanger according to claim 1 or 2, characterized in that a hollow water jacket surrounding the heat plate is provided outside the heat plate. 8. The heat plate heat exchanger according to claim 1 or 2, characterized in that, in the upper medium channel, a hollow water jacket surrounding the heat plate is provided on the outside of the heat plate, and in the lower medium channel Inside, several ribs or fins are provided on the surface of the hot plate. 9. The heat plate heat exchanger according to claim 2, characterized in that, the fins are in the form of sawtooth or porous or corrugated. 10. The heat plate heat exchanger according to claim 2, wherein the fins are arranged in a horizontal row, a vertical row or an inclined arrangement at a certain angle.

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