Waste gas waste heat recovery device

Abstract

The utility model relates to a waste gas waste heat recovery device, which belongs to the technical field of waste gas treatment and comprises a heat insulation box, two sides of the heat insulation box are oppositely opened, so that openings on two sides of the heat insulation box respectively form a waste gas inlet and a waste gas outlet, and the inside of the heat insulation box is a waste gas channel for waste gas to pass through. The heat exchanger comprises a plurality of fresh air pipes allowing fresh air to pass through, the fresh air pipes are vertically arranged in the waste gas channel, an air passing gap allowing waste gas to pass through is reserved on the periphery of each fresh air pipe, high-pressure cleaning nozzles used for flushing the outer walls of the fresh air pipes are further arranged in the heat insulation box, cleaning is more convenient, and the heat exchange speed is higher.

Description

TECHNICAL FIELD

[0001] The utility model belongs to waste gas treatment technical field, concretely relates to a waste gas waste heat recovery device. BACKGROUND

[0002] The conventional waste gas waste heat recovery device usually adopts the heat exchange layout that the hot waste gas goes inside the pipe and the fresh air goes outside the pipe, and the oil stains and impurities carried by the hot waste gas are all left in the pipe, and it is inconvenient to clean the pipe. UTILITY MODEL CONTENTS

[0003] The utility model discloses a waste gas waste heat recovery device convenient to clean.

[0004] Therefore, the utility model adopts the following technical scheme:

[0005] A waste gas waste heat recovery device, comprising a heat insulation box, the heat insulation box is split on both sides to form an exhaust gas inlet and an exhaust gas outlet on both sides respectively, and the inside of the heat insulation box becomes an exhaust gas passage for the exhaust gas to pass through, and a heat exchanger is arranged in the heat insulation box, the heat exchanger comprises a plurality of fresh air pipes for the fresh air to pass through, the plurality of fresh air pipes are vertically arranged in the exhaust gas passage, and a wind passing gap for the exhaust gas to pass through is reserved around each fresh air pipe, and a high-pressure cleaning nozzle for flushing the outer wall of the plurality of fresh air pipes is further arranged in the heat insulation box.

[0006] As a preferred scheme, the heat exchanger further comprises an upper fresh air box and a lower fresh air box arranged in the heat insulation box at a distance vertically, and the plurality of fresh air pipes are arranged between the upper fresh air box and the lower fresh air box and are connected to the upper fresh air box at the top and connected to the lower fresh air box at the bottom.

[0007] As a preferred scheme, the heat exchanger is provided with more than three sets, and the more than three sets of heat exchangers are arranged in a row transversely between the exhaust gas inlet and the exhaust gas outlet, and the upper fresh air boxes of any two adjacent heat exchangers are fixedly connected to each other and communicated with each other through a connecting box, so as to fix and connect the plurality of heat exchangers into a heat exchange assembly.

[0008] As a preferred scheme, the heat exchanger comprises four sets, and wherein:

[0009] The lower fresh air box closest to the exhaust gas outlet is provided with a cool fresh air guide inlet, and the lower fresh air box closest to the exhaust gas inlet is provided with a cool fresh air guide outlet, so that the flow directions of the exhaust gas and the fresh air in the heat insulation box are opposite.

[0010] The upper fresh air box next to the exhaust gas outlet is divided into a first chamber and a second chamber by a first partition plate, the first chamber is located at the exhaust gas outlet side and is connected with a part of the fresh air pipe of the heat exchanger, and the second chamber is located at the exhaust gas inlet side and is connected with another part of the fresh air pipe of the heat exchanger; the upper fresh air box next to the exhaust gas inlet is divided into a third chamber and a fourth chamber by a second partition plate, the third chamber is located at the exhaust gas outlet side and is connected with a part of the fresh air pipe of the heat exchanger, and the fourth chamber is located at the exhaust gas inlet side and is connected with another part of the fresh air pipe of the heat exchanger; the first chamber is connected with the upper fresh air box closest to the exhaust gas outlet, the second chamber is connected with the third chamber, and the fourth chamber is connected with the upper fresh air box closest to the exhaust gas inlet.

[0011] As a preferred solution, the fresh air pipe of each heat exchanger is divided into two rows, and one row is close to the exhaust gas outlet, and the other row is close to the exhaust gas inlet.

[0012] As a preferred solution, the first chamber is connected with the row of fresh air pipes of the heat exchanger close to the exhaust gas outlet, and the second chamber is connected with the row of fresh air pipes of the heat exchanger close to the exhaust gas inlet.

[0013] As a preferred solution, the third chamber is connected with the row of fresh air pipes of the heat exchanger close to the exhaust gas outlet, and the fourth chamber is connected with the row of fresh air pipes of the heat exchanger close to the exhaust gas inlet.

[0014] As a preferred solution, the two rows of fresh air pipes of each heat exchanger are transversely staggered, and the fresh air pipes in the same row are transversely arranged.

[0015] As a preferred solution, the exhaust gas inlet side and the exhaust gas outlet side of each heat exchanger are provided with high-pressure cleaning nozzles.

[0016] As a preferred solution, all the fresh air pipes are oval flat tubes, and the narrow arc surface is used as the windward surface of the exhaust gas.

[0017] The utility model discloses a heat exchange layout that cool fresh air goes in the fresh air pipe, and hot exhaust gas goes out of the fresh air pipe, and the oil stains and sundries carried by the hot exhaust gas only adhere to the outer wall of the fresh air pipe and do not remain in the fresh air pipe, secondly, the utility model sets up all the fresh air pipes of the heat exchanger vertically, and is provided with high-pressure cleaning nozzles for spraying high-pressure water to the outer wall of the fresh air pipe of the heat exchanger on the exhaust gas inlet side and the exhaust gas outlet side of each heat exchanger, and only needs to flush the high-pressure water on the outer wall of the fresh air pipe through the high-pressure cleaning nozzle, and can directly flush away the oil stains and dirt, and is convenient to clean. DRAWINGS

[0018] Figure 1 It is a kind of exhaust gas waste heat recovery device overall structure schematic diagram disclosed by the utility model

[0019] Figure 2The heat exchange assembly structure schematic diagram disclosed by the utility model

[0020] Figure 3 The longitudinal sectional view of the waste gas waste heat recovery device disclosed by the utility model

[0021] Figure 4 The transverse sectional view of the waste gas waste heat recovery device disclosed by the utility model

[0022] Figure 5 The fresh air pipe structure schematic diagram disclosed by the utility model Specific implementation

[0023] The utility model will be described below in combination with the drawings and specific embodiments.

[0024] As Figures 1-5 The waste gas waste heat recovery device shown in the figure, including heat insulation box 10, the heat insulation box 10 both sides open to make its both sides opening respectively form waste gas inlet 10.1 and waste gas outlet 10.2, and make its inside become the waste gas passage for waste gas to pass through, waste gas inlet 10.1 is connected with two-stage filter part 30, and the two-stage filter part 30 includes two-stage filter box 31 fixedly connected to heat insulation box 10 and communicated waste gas inlet 10.1, two-stage filter box 31 inside is equipped with air equalizing net 32 and two-stage manual filter screen 33, two-stage filter box 31 is connected with primary filter part 40, and the primary filter part 40 includes primary filter box 41 fixedly connected and communicated two-stage filter box 31, and the primary filter box 41 is rotatably provided with 28 mesh filter screen disc 42, and the 28 mesh filter screen disc 42 is connected with motor 43 driven to rotate, and the side of 28 mesh filter screen disc 42 is equipped with steam pipe and water jet pipe, and the steam pipe is towards the screen surface of 28 mesh filter screen disc 42 and sprays steam, and the water jet pipe is towards the screen surface of 28 mesh filter screen disc 42 and sprays water, primary filter box 41 is connected with waste gas lead-in box 50, and waste gas outlet is connected with waste gas lead-out box 60.

[0025] Heat insulation box 10 is equipped with heat exchange assembly 20, and the heat exchange assembly 20 includes four sets of heat exchangers 21, each set of heat exchanger 21 includes an upper fresh air box 21.1, a lower fresh air box 21.2 and a plurality of fresh air pipes 21.3, the upper fresh air box 21.1 is fixedly arranged in the top wall of heat insulation box 10, the lower fresh air box 21.2 is arranged below the upper fresh air box 21.1 and is fixedly connected to each other as a whole through connecting rods 21.4, and the plurality of fresh air pipes 21.3 are vertically arranged between the upper fresh air box 21.1 and the lower fresh air box 21.2 and are connected to the upper fresh air box 21.1 at the top and connected to the lower fresh air box 21.2 at the bottom.

[0026] Four sets of heat exchangers 21 are arranged in a row between the exhaust gas inlet 10.1 and the exhaust gas outlet 10.2, so that all the fresh air pipes 21.3 are vertically arranged in the exhaust gas passage. The fresh air pipes 21.3 of each set of heat exchangers 21 are divided into two rows, one of which is close to the exhaust gas outlet 10.2 and the other is close to the exhaust gas inlet 10.1. The two rows of fresh air pipes 21.3 of the same set of heat exchangers 21 are horizontally staggered, and the same row of fresh air pipes 21.3 of the same set of heat exchangers 21 are horizontally spaced, so that the periphery of each fresh air pipe 21.3 has a wind gap for the exhaust gas to pass through. All the fresh air pipes 21.3 are oval flat tubes, and the narrow arc surface is used as the exhaust gas windward surface, so that the fresh air flowing in the fresh air pipe 21.3 can be more fully and quickly exchanged with the exhaust gas flowing outside the fresh air pipe 21.3, and the oil stains and impurities carried by the exhaust gas are less likely to remain on the outer wall of the fresh air pipe 21.2.

[0027] Any two adjacent upper fresh air boxes 21.1 are fixedly connected and communicated with each other through a connecting box 22, so as to fix and connect the four sets of heat exchangers 21 into a set of heat exchange assembly 20.

[0028] The lower fresh air box 21.2 closest to the warm exhaust gas outlet 10.2 is provided with a cool fresh air guide inlet connected with a centrifugal blower 70, and the lower fresh air box 21.2 closest to the exhaust gas inlet 10.1 is provided with a hot fresh air guide outlet connected with a fresh air discharge box 80. This design can make the flow directions of the exhaust gas and the fresh air in the heat insulation box 10 opposite, so that the coolest fresh air entering the heat exchange assembly 20 exchanges heat with the hottest exhaust gas entering the heat insulation box 10, thereby accelerating the heat exchange speed.

[0029] The upper fresh air box 21.1 next to the warm exhaust gas outlet 10.2 is divided into a first chamber 21.11 and a second chamber 21.12 by a first partition 23, the first chamber 21.11 is located at the side of the warm exhaust gas outlet 10.2 and communicates with the row of fresh air pipes 21.3 of the heat exchanger 21 next to the warm exhaust gas outlet 10.2, the second chamber 21.12 is located at the side of the exhaust gas inlet 10.1 and communicates with the row of fresh air pipes 21.3 of the heat exchanger 21 next to the exhaust gas inlet 10.1; the upper fresh air box 21.1 next to the exhaust gas inlet 10.1 is divided into a third chamber 21.13 and a fourth chamber 21.14 by a second partition 24, the third chamber 21.13 is located at the side of the warm exhaust gas outlet 10.2 and communicates with the row of fresh air pipes 21.3 of the heat exchanger 21 next to the warm exhaust gas outlet 10.2, the fourth chamber 21.14 is located at the side of the exhaust gas inlet 10.1 and communicates with the row of fresh air pipes 21.3 of the heat exchanger 21 next to the exhaust gas inlet 10.1; the first chamber 21.11 communicates with the upper fresh air box 21.1 closest to the warm exhaust gas outlet 10.2, the second chamber 21.12 communicates with the third chamber 21.13, and the fourth chamber 21.14 communicates with the upper fresh air box 21.1 closest to the exhaust gas inlet 10.1, so that the fresh air passes through the heat exchanger 21 closest to the warm exhaust gas outlet 10.2 once, passes through the two heat exchangers 21 in the middle twice, and passes through the heat exchanger 21 closest to the exhaust gas inlet 10.1 once. In this scheme, the fresh air pipes 21.3 of the two heat exchangers 21 in the middle are provided with double channels for the fresh air to pass through twice, so as to prolong the travel of the fresh air in the heat insulation box 10, so that the fresh air can more fully absorb the heat of the hot exhaust gas.

[0030] In order to facilitate the cleaning of oil stains and impurities remaining on the outer wall of the fresh air pipe 21.3, high-pressure cleaning nozzles 25 for flushing the outer wall of all fresh air pipes 21.3 of each heat exchanger 21 are arranged on the water pipes arranged horizontally in the heat insulation box 10, the water pipes can be provided with cold water pipes and hot water pipes, hot water can be sprayed to the outer wall of the fresh air pipe 21.3 by the high-pressure cleaning nozzles 25 arranged on the hot water pipes to soften the oil and impurities, and then cold water can be sprayed to the outer wall of the fresh air pipe 21.3 by the high-pressure cleaning nozzles 25 arranged on the cold water pipes to flush away the oil and other impurities. Therefore, a water collecting groove 90 can be arranged at the bottom of the heat insulation box 10 to collect the waste water generated during the operation or cleaning of the four heat exchangers 21.

[0031] In use, connect the exhaust gas inlet box 50 to the exhaust end of the exhaust gas generating equipment, connect the exhaust gas outlet box 60 to the exhaust gas extraction fan, connect the air inlet of the centrifugal blower 70 to the outside, and connect the fresh air outlet box 80 to the equipment or place that needs to use hot fresh air. Simultaneously start the exhaust gas extraction fan and the centrifugal blower 70. The exhaust gas flows through the exhaust gas inlet box 50, is filtered by the primary filter box 40 and the secondary filter box 30, and then flows through the heat insulation box 10. It exchanges heat with the cool fresh air flowing through the fresh air duct 21.3. The warm exhaust gas, which still has residual heat after the heat exchange, can be transported to other exhaust gas treatment equipment by the exhaust gas extraction fan. The hot fresh air formed after the heat exchange is then transported to the place or equipment in use by the hot fresh air outlet box 80.

[0032] like Figure 3 As indicated by the dotted arrows, the fresh air flow direction is as follows: Cool fresh air from the outside is first blown by the centrifugal blower 70 into the lower fresh air box 21.2 of the heat exchanger 21 closest to the exhaust gas outlet 10.2. Then, it flows upwards along the two rows of fresh air ducts 21.3 of the heat exchanger 21 into the upper fresh air box 21.1. Afterwards, it flows downwards through the connecting box 22 and the first chamber 21.11, passing through the next row of fresh air ducts 21.3 of the heat exchanger 21 closest to the exhaust gas outlet 10.2, and then into the lower fresh air box 21.2 of the heat exchanger 21. Finally, it flows upwards through the heat exchanger... Another row of fresh air ducts 21.3 enters the second chamber 21.12 and the third chamber 21.13, then flows downwards through another row of fresh air ducts 21.3 closest to the exhaust gas inlet 10.1 into the lower fresh air box 21.2 of the heat exchanger 21, and upwards through another row of fresh air ducts 21.3 of the heat exchanger 21 into the fourth chamber 21.14. Finally, it flows along all the fresh air ducts 21.3 closest to the exhaust gas inlet 10.1 into the lower fresh air box 21.2 of the heat exchanger 21, and is then extracted by the centrifugal blower 80. In the above process, the fresh air flowing through the four heat exchangers 21 can exchange heat with the exhaust gas flowing through the insulation box 10 six times, which is beneficial to improving the waste heat utilization rate of the exhaust gas.

Claims

1. A waste heat recovery device for waste gas, comprising an insulated box (10), the insulated box (10) being split open on both sides such that the openings on both sides respectively form a waste gas inlet (10.1) and a waste gas outlet (10.2), and its interior becomes a waste gas passage for waste gas to pass through, characterized in that: The heat exchanger (21) is provided inside the heat insulation box (10). The heat exchanger (21) includes several fresh air ducts (21.3) for fresh air to pass through. The several fresh air ducts (21.3) are all vertically installed in the exhaust gas channel. Each fresh air duct (21.3) has an air passage gap around its perimeter for exhaust gas to pass through. The heat insulation box (10) is also provided with a high-pressure cleaning nozzle (25) for rinsing the outer wall of the several fresh air ducts (21.3).

2. The waste heat recovery device for exhaust gas according to claim 1, characterized in that: The heat exchanger (21) also includes an upper fresh air box (21.1) and a lower fresh air box (21.2) that are set apart in the heat insulation box (10). Several fresh air ducts (21.3) are set between the upper fresh air box (21.1) and the lower fresh air box (21.2) with their top ends connected to the upper fresh air box (21.1) and their bottom ends connected to the lower fresh air box (21.2).

3. The waste heat recovery device according to claim 2, characterized in that: There are three or more heat exchangers (21). The three or more heat exchangers (21) are arranged in a horizontal row between the exhaust gas inlet (10.1) and the exhaust gas outlet (10.2). The fresh air box (21.1) of any two adjacent heat exchangers (21) are connected to each other by a connecting box (22) so as to fix multiple heat exchangers (21) into a heat exchange assembly (20).

4. The waste heat recovery device for exhaust gas according to claim 3, characterized in that: The heat exchanger (21) comprises four sets, of which: The lower fresh air box (21.2) closest to the exhaust gas outlet (10.2) is provided with a cool fresh air inlet, and the lower fresh air box (21.2) closest to the exhaust gas inlet (10.1) is provided with a cool fresh air outlet, so that the exhaust gas and fresh air flow in opposite directions in the heat insulation box (10); The upper fresh air box (21.1) closest to the exhaust gas outlet (10.2) is laterally divided into a first chamber (21.11) and a second chamber (21.12) by a first partition (23). The first chamber (21.11) is located on the side of the exhaust gas outlet (10.2) and is connected to a portion of the fresh air duct (21.3) of the same heat exchanger (21). The second chamber (21.12) is located on the side of the exhaust gas inlet (10.1) and is connected to another portion of the fresh air duct (21.3) of the same heat exchanger (21). The upper fresh air box (21.1) closest to the exhaust gas inlet (10.1) is laterally divided into a third chamber (21.13) and a second chamber (21.14) by a second partition (24). The fourth chamber (21.14) and the third chamber (21.13) are located on the side of the exhaust gas outlet (10.2) and connected to a part of the fresh air duct (21.3) of the same heat exchanger (21). The fourth chamber (21.14) is located on the side of the exhaust gas inlet (10.1) and connected to another part of the fresh air duct (21.3) of the same heat exchanger (21). The first chamber (21.11) is connected to the upper fresh air box (21.1) closest to the exhaust gas outlet (10.2). The second chamber (21.12) is connected to the third chamber (21.13). The fourth chamber (21.4) is connected to the upper fresh air box (21.1) closest to the exhaust gas inlet (10.1).

5. The waste heat recovery device for exhaust gas according to claim 4, characterized in that: Each heat exchanger (21) has two rows of fresh air ducts (21.3), with one row near the exhaust outlet (10.2) and the other row near the exhaust inlet (10.1).

6. The waste heat recovery device according to claim 5, characterized in that: The first chamber (21.11) is connected to a row of fresh air ducts (21.3) near the exhaust gas outlet (10.2) of its heat exchanger (21), and the second chamber (21.12) is connected to a row of fresh air ducts (21.3) near the exhaust gas inlet (10.1) of its heat exchanger (21).

7. The waste heat recovery device according to claim 5, characterized in that: The third chamber (21.13) is connected to a row of fresh air ducts (21.3) near the exhaust gas outlet (10.2) of its heat exchanger (21), and the fourth chamber (21.14) is connected to a row of fresh air ducts (21.3) near the exhaust gas inlet (10.1) of its heat exchanger (21).

8. The waste heat recovery device according to claim 5, characterized in that: The two rows of fresh air ducts (21.3) of each heat exchanger (21) are arranged horizontally in an alternating manner, and the fresh air ducts (21.3) in the same row are arranged horizontally at different distances.

9. A waste heat recovery device for exhaust gas according to claim 4, characterized in that: Each heat exchanger (21) is equipped with a high-pressure cleaning nozzle (25) on both the exhaust gas inlet side and the exhaust gas outlet side.

10. A waste heat recovery device for exhaust gas according to any one of claims 1-9, characterized in that: All fresh air ducts (21.3) are elliptical flat ducts with narrow arc surfaces as the air intake surfaces.

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