A regenerative air preheater

Abstract

The utility model provides a flue type air preheater, which makes flue gas along the flow channel to fully preheat air, and flue gas dust does not affect heat exchange operation, and improves heat exchange efficiency. It includes: high temperature heat exchange area, it includes a plurality of vertical parallelly arranged first plate type heat exchange sheet, three first plate type heat exchange sheet of adjacent through a pair of first horizontal baffle, a pair of first vertical baffle form adjacent first horizontal flow channel, first vertical flow channel, first horizontal flow channel, first vertical flow channel are arranged in sequence interval arrangement, low temperature heat exchange area, it includes a plurality of vertical parallelly arranged second plate type heat exchange sheet, three second plate type heat exchange sheet of adjacent through a pair of second horizontal baffle, a pair of second vertical baffle form adjacent second horizontal flow channel, second vertical flow channel, second horizontal flow channel, second vertical flow channel are arranged in sequence interval arrangement, flue gas turning area and air transition area.

Description

Technical Field

[0001] This utility model relates to the technical field of preheaters, specifically a flue-type air preheater. Background Technology

[0002] The blast furnace hot blast stove is a major energy-consuming device, accounting for over 60% of the total equipment. Approximately 90% of the heat loss in the furnace is carried away by the flue gas. Calculations show that for every 10°C increase in exhaust gas temperature, the furnace's thermal efficiency decreases by 0.42%, highlighting the significant role of flue gas waste heat recovery. However, using a tubular structure to preheat air with this waste heat presents drawbacks such as high dust levels, severe blockage, inconvenient cleaning, and low heat exchange efficiency. Therefore, the reliable utilization of flue gas preheating for air preheating necessitates the development of an air preheater for efficient and reliable air preheating. Utility Model Content

[0003] To address the aforementioned problems, this utility model provides a flue-type air preheater, which enables flue gas to fully preheat air along the flow channel, and the flue gas dust does not affect the heat exchange operation, thereby improving heat exchange efficiency.

[0004] A flue-type air preheater, characterized in that it comprises: The high-temperature heat exchange zone includes several vertically parallel first plate heat exchange plates. Three adjacent first plate heat exchange plates form adjacent first horizontal flow channels and first vertical flow channels through a pair of first horizontal baffles and a pair of first vertical baffles. The first horizontal flow channels and first vertical flow channels are arranged in sequence at intervals. The low-temperature heat exchange zone includes several vertically parallel second plate heat exchange plates. Three adjacent second plate heat exchange plates form adjacent second horizontal flow channels and second vertical flow channels through a pair of second horizontal baffles and a pair of second vertical baffles. The second horizontal flow channels and second vertical flow channels are arranged in sequence at intervals. The flue gas turning zone is used to connect the lower outlet of the first vertical direct current channel of the high-temperature heat exchange zone and the lower inlet of the second vertical direct current channel of the low-temperature heat exchange zone. And an air transition zone, which is used to connect the air outlet of the second horizontal flow channel of the low temperature heat exchange zone and the air inlet of the second horizontal flow channel of the high temperature heat exchange zone. Air enters the air inlet of the second horizontal flow channel of the low-temperature heat exchange zone, and flows out after passing through the second horizontal flow channel, the air transition zone, and the first horizontal flow channel in sequence. The flue gas enters the upper inlet of the first vertical direct flow channel in the high-temperature heat exchange zone from top to bottom. The flue gas flows sequentially through the first vertical direct flow channel, the flue gas turning zone, and the second vertical flue before flowing upward.

[0005] Its further features are: The high-temperature heat exchange zone, low-temperature heat exchange zone, and air transition zone are separated and independently set by a vertical frame, which allows the plate heat exchange plates in the high-temperature heat exchange zone and the low-temperature heat exchange zone to be arranged independently. The top cover of the high-temperature heat exchange zone is equipped with a guide input sleeve, and the top cover of the low-temperature heat exchange zone is equipped with a guide output sleeve, which allows the flue gas to be quickly connected to the external pipeline. The flue gas turning zone is enclosed by a partition to form a connected and closed area, which includes a first port connected to the bottom flue gas outlet of the high-temperature heat exchange zone and a second port connected to the bottom flue gas inlet of the low-temperature heat exchange zone. The flue gas turning zone is also equipped with a dust discharge channel or dust discharge outlet, which facilitates the discharge of deposited dust and ensures the smooth flow of the entire channel. The first and second plate heat exchange plates have several protrusions arranged in an array on their plate surfaces, which makes the flow channels formed by adjacent plates smoother and has less fluid resistance.

[0006] With the adoption of this utility model, the flue gas flows vertically through the first vertical direct flow channel, then turns through the flue gas turning zone and flows from bottom to top into the second vertical direct flow channel before flowing out. The air flows sequentially through the second horizontal flow channel, the air transition zone, and the first horizontal flue before flowing out, completing the preheating. The air exchanges heat with the low-temperature flue gas in the low-temperature heat exchange zone and the high-temperature flue gas in the high-temperature heat exchange zone. Because the heat exchange zone is constructed using plate heat exchange plates, the flue gas fully preheats the air along the flow channel, and the flue gas dust does not affect the heat exchange operation, thus improving the heat exchange efficiency. Attached Figure Description

[0007] Figure 1 This is the front view of the present invention; Figure 2 This is a top view of the present invention; Figure 3 This is the left view of the present invention; Figure 4 This is a front view of the first or second plate heat exchanger plate of this utility model. Figure 5 This is a schematic diagram of the flow channel arrangement in the high-temperature heat exchange zone of this utility model; Figure 6 This is a schematic diagram of the flow channel arrangement in the low-temperature heat exchange zone of this utility model; The names corresponding to the serial numbers in the diagram are as follows: High-temperature heat exchange zone 10, first plate heat exchange plate 11, first horizontal baffle 12, first vertical baffle 13, first horizontal flow channel 14, first vertical direct flow channel 15, low-temperature heat exchange zone 20, second plate heat exchange plate 21, second horizontal baffle 22, second vertical baffle 23, second horizontal flow channel 24, second vertical direct flow channel 25, flue gas turning zone 30, first port 31, second port 32, air transition zone 40, vertical frame 50, guide input sleeve 60, guide output sleeve 70; Bump 1. Detailed Implementation

[0008] A flue-type air preheater, see Figures 1-6 It includes a high-temperature heat exchange zone 10, a low-temperature heat exchange zone 20, a flue gas turning zone 30, and an air transition zone 40; The high-temperature heat exchange zone 10 includes a number of vertically parallel first plate heat exchange plates 11. Three adjacent first plate heat exchange plates 11 form adjacent first horizontal flow channels 14 and first vertical flow channels 15 through a pair of first horizontal baffles 12 and a pair of first vertical baffles 13. The first horizontal flow channels 14 and first vertical flow channels 15 are arranged in sequence at intervals. The low-temperature heat exchange zone 20 includes several vertically parallel second plate heat exchange plates 21. Three adjacent second plate heat exchange plates 21 form adjacent second horizontal flow channels 24 and second vertical flow channels 25 through a pair of second horizontal baffles 22 and a pair of second vertical baffles 23. The second horizontal flow channels 24 and second vertical flow channels 25 are arranged in sequence at intervals. The flue gas turning zone 30 is used to connect the lower outlet of the first vertical direct current channel 15 of the high temperature heat exchange zone 10 and the lower inlet of the second vertical direct current channel 25 of the low temperature heat exchange zone 20. The air transition zone 40 is used to connect the air outlet of the second horizontal flow channel 24 of the low temperature heat exchange zone 20 and the air inlet of the second horizontal flow channel 14 of the high temperature heat exchange zone 10. Air enters the air inlet of the second horizontal flow channel 24 of the low-temperature heat exchange zone 20, and flows through the second horizontal flow channel 24, the air transition zone 40 and the first horizontal flow channel 14 in sequence before exiting; The flue gas enters the upper inlet of the first vertical direct flow channel 15 of the high-temperature heat exchange zone 10 from top to bottom. The flue gas flows sequentially through the first vertical direct flow channel 15, the flue gas turning zone 30, and the second vertical flue 25 before flowing upward.

[0009] In a specific embodiment, the high-temperature heat exchange zone 10, the low-temperature heat exchange zone 20, and the air transition zone 40 are separated and independently set by a vertical frame 50, which allows the plate heat exchange plates in the high-temperature heat exchange zone 10 and the low-temperature heat exchange zone 20 to be arranged independently. The top cover of the high-temperature heat exchange zone 10 is equipped with a guide input sleeve 60, and the top cover of the low-temperature heat exchange zone 20 is equipped with a guide output sleeve 70, which allows the flue gas to be quickly connected to the external pipeline.

[0010] In a specific embodiment, the flue gas turning zone 30 is enclosed by a partition to form a connected closed zone, which includes a first port 31 connected to the bottom flue gas outlet of the high temperature heat exchange zone 10 and a second port 32 connected to the bottom flue gas inlet of the low temperature heat exchange zone 20. The flue gas turning zone 30 is also equipped with a dust discharge channel or a dust discharge outlet, which facilitates the discharge of deposited dust and ensures the smooth flow of the entire channel. The dust discharge channel is located on both sides of the bottom of the flue gas turning zone and protrudes outward. The dust discharge outlet is located in the center area of ​​the bottom of the flue gas turning zone. The bottom plate is arranged to be inclined upward from the center to both sides, so that the dust discharge outlet can automatically deposit dust.

[0011] In a specific embodiment, several protrusions 1 are arrayed on the plate surface of the first plate heat exchange plate 11 and the second plate heat exchange plate 21, which makes the flow channel formed by adjacent plates smoother and has less fluid resistance.

[0012] Its working principle is as follows: the flue gas flows vertically through the first vertical direct flow channel, then turns through the flue gas turning zone and flows from bottom to top into the second vertical direct flow channel before flowing out. The air flows sequentially through the second horizontal flow channel, the air transition zone, and the first horizontal flue before flowing out, completing the preheating. The air exchanges heat with the low-temperature flue gas in the low-temperature heat exchange zone and the high-temperature flue gas in the high-temperature heat exchange zone. Because the heat exchange zone is constructed using plate heat exchange plates, the flue gas fully preheats the air along the flow channel, and the flue gas dust does not affect the heat exchange operation, thus improving the heat exchange efficiency.

[0013] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0014] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A flue-type air preheater, characterized in that, It includes: The high-temperature heat exchange zone includes several vertically parallel first plate heat exchange plates. Three adjacent first plate heat exchange plates form adjacent first horizontal flow channels and first vertical flow channels through a pair of first horizontal baffles and a pair of first vertical baffles. The first horizontal flow channels and first vertical flow channels are arranged in sequence at intervals. The low-temperature heat exchange zone includes several vertically parallel second plate heat exchange plates. Three adjacent second plate heat exchange plates form adjacent second horizontal flow channels and second vertical flow channels through a pair of second horizontal baffles and a pair of second vertical baffles. The second horizontal flow channels and second vertical flow channels are arranged in sequence at intervals. The flue gas turning zone is used to connect the lower outlet of the first vertical direct current channel of the high-temperature heat exchange zone and the lower inlet of the second vertical direct current channel of the low-temperature heat exchange zone. And an air transition zone, which is used to connect the air outlet of the second horizontal flow channel of the low temperature heat exchange zone and the air inlet of the second horizontal flow channel of the high temperature heat exchange zone. Air enters the air inlet of the second horizontal flow channel of the low-temperature heat exchange zone, and flows out after passing through the second horizontal flow channel, the air transition zone, and the first horizontal flow channel in sequence. The flue gas enters the upper inlet of the first vertical direct flow channel in the high-temperature heat exchange zone from top to bottom. The flue gas flows sequentially through the first vertical direct flow channel, the flue gas turning zone, and the second vertical flue before flowing upward.

2. The flue-type air preheater according to claim 1, characterized in that: The high-temperature heat exchange zone, low-temperature heat exchange zone, and air transition zone are separated and independently set up by a vertical frame.

3. A flue-type air preheater according to claim 1, characterized in that: The top cover of the high-temperature heat exchange zone is equipped with a guide input sleeve, and the top cover of the low-temperature heat exchange zone is equipped with a guide output sleeve.

4. A flue-type air preheater according to claim 1, characterized in that: The flue gas turning zone is enclosed by a partition to form a connected and enclosed area, which includes a first port connected to the bottom flue gas outlet of the high-temperature heat exchange zone and a second port connected to the bottom flue gas inlet of the low-temperature heat exchange zone.

5. A flue-type air preheater according to claim 1 or 4, characterized in that: The flue gas turning zone is also equipped with a dust discharge channel or a dust discharge outlet.

6. A flue-type air preheater according to claim 1, characterized in that: The first plate heat exchange plate and the second plate heat exchange plate have several protrusions arranged in an array on their plate surfaces.

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