A waste incineration flue

Abstract

The utility model discloses a waste incineration flue, including first direct current flue, cyclone flue, second direct current flue that connect gradually, the inside of first direct current flue, second direct current flue is provided with first heat exchange part, the inside of cyclone flue is provided with second heat exchange part, first heat exchange part is connected with water circulation device, second heat exchange part is connected with air heat exchanger, through intermediate mixing temperature regulator connection between water circulation device and air heat exchanger, the utility model can carry out sufficient recovery to the waste heat in flue gas, and remove the large particle smoke dust in flue gas, provide favorable condition for subsequent harmless treatment to flue gas.

Description

Technical Field

[0001] This utility model belongs to the technical field of incineration waste gas treatment, specifically relating to a flue for waste incineration. Background Technology

[0002] The flue gas generated during waste incineration contains a large amount of residual heat and large particulate impurities. Current technologies directly discharge this high-temperature flue gas to subsequent harmless treatment devices for filtration, sedimentation, and other harmless treatment processes, resulting in a waste of residual heat. Simultaneously, the high-temperature flue gas and the large amount of large particulate matter it contains reduce the treatment efficiency of the subsequent harmless treatment devices and increase their energy consumption. Therefore, to address the shortcomings of existing technologies in separating large particulate matter and recovering residual heat from the high-temperature flue gas generated by waste incineration, this utility model discloses a flue gas duct for waste incineration. Utility Model Content

[0003] This utility model discloses a flue for waste incineration, which can fully recover the residual heat in the flue gas and remove large particulate matter from the flue gas, providing favorable conditions for subsequent harmless treatment of the flue gas.

[0004] This utility model is achieved through the following technical solution: A waste incineration flue includes a first direct-flow flue, a swirl flue, and a second direct-flow flue connected in sequence. The first direct-flow flue and the second direct-flow flue are provided with a first heat exchange section inside, and the swirl flue is provided with a second heat exchange section inside. The first heat exchange section is connected to a water circulation device, and the second heat exchange section is connected to an air heat exchanger. The water circulation device and the air heat exchanger are connected through an intermediate mixer.

[0005] The high-temperature flue gas generated during waste incineration first enters the first direct-flow flue and exchanges heat with the first heat exchange section. A water circulation device circulates water, the heat exchange medium, to the first heat exchange section to absorb the residual heat in the flue gas, achieving waste heat recovery and utilization. Then, the flue gas enters the swirl flue and swirls along it. Under the centrifugal force generated by the swirl, heavier dust particles in the flue gas settle in the swirl flue, reducing the dust particle content and aiding in subsequent harmless treatment of the flue gas. Simultaneously, the flue gas exchanges heat with the second heat exchange section in the swirl flue, which transfers heat to the air heat exchanger to heat the air in the air heat exchanger, achieving waste heat recovery and utilization again. Then, the flue gas enters the second direct-flow flue and exchanges heat again with the first heat exchange section in the second direct-flow flue, transferring heat to the water, the heat exchange medium, supplied by the water circulation device. The heat exchange medium water from the first direct-flow flue and the heat exchange medium water from the second direct-flow flue enter the intermediate mixer to mix and balance the temperature. The intermediate mixer can deliver the heat exchange medium water after temperature balance to the air heat exchanger to assist in heating the air in the air heat exchanger.

[0006] To better realize this utility model, the first heat exchange part further includes an inner ring pipe and an outer sleeve. The inner ring pipe is disposed inside the flue, and the outer sleeve is disposed outside the flue. The inner ring pipe is connected to a water circulation device, and a cavity is formed between the outer sleeve and the outer side of the flue. The cavity is connected to the water circulation device.

[0007] To better realize this utility model, the water circulation device further includes a first water tank, a second water tank, and a circulating water pump. The first water tank is connected to the inner loop pipe through a first circulation pipeline, and the second water tank is connected to the cavity through a second circulation pipeline. A circulating water pump is installed on both the first and second circulation pipelines. The first and second water tanks are also connected to an intermediate mixer.

[0008] To better realize this utility model, the air heat exchanger further includes an outer cylinder and a heat exchange channel. A water injection chamber is provided inside the outer cylinder, and a heat exchange channel is provided inside the water injection chamber. An air inlet pipe is provided at one end of the heat exchange channel, and an air outlet pipe is provided at the other end of the heat exchange channel. The water injection chamber is connected to an intermediate mixer. A second heat exchange section is provided between the air inlet pipe and the interior of the swirl flue.

[0009] To better realize this utility model, the heat exchange channel is further described as a honeycomb channel, with one end of the honeycomb channel connected to the air inlet pipe via an air inlet hood and the other end of the honeycomb channel connected to the air outlet pipe via an air outlet hood.

[0010] To better realize this utility model, the second heat exchange part further includes heat exchange fins, one end of which extends into the interior of the air inlet pipe, and the other end of which extends into the interior of the swirl flue.

[0011] To better realize this utility model, the area of ​​the heat exchange fins in contact with the external environment is further covered with a heat insulation layer.

[0012] To better realize this utility model, a first filter element is further provided between the air outlet end of the first DC flue and the air inlet end of the swirl flue, and a second filter element is provided between the air outlet end of the swirl flue and the air inlet end of the second DC flue.

[0013] To better realize this utility model, the first filter element and the second filter element have the same structure, and the first filter element includes several groups of filter screens arranged in sequence.

[0014] Compared with the prior art, this utility model has the following advantages and beneficial effects: (1) This utility model fully exchanges heat with high-temperature flue gas through the first heat exchange section and the second heat exchange section, and fully recovers the residual heat in the flue gas. While utilizing the residual heat, it can reduce the temperature of the flue gas, thereby reducing the energy consumption of the subsequent harmless treatment device in the flue gas treatment process. (2) By setting up a swirl flue, the flue gas swirls along the swirl flue. Under the action of centrifugal force generated by the swirl, the larger particulate impurities with a higher specific gravity in the flue gas settle inside the swirl flue, thereby removing large particulate dust from the flue gas, reducing the content of large particulate dust in the flue gas, and providing favorable conditions for the subsequent harmless treatment of flue dust. Attached Figure Description

[0015] Figure 1 A schematic diagram of the structure of a flue for waste incineration; Figure 2 This is a schematic diagram of the structure of the first heat exchange section; Figure 3 This is a schematic diagram of an air heat exchanger.

[0016] Wherein: 1-First direct-flow flue; 2-Second direct-flow flue; 3-Swirl flue; 4-First heat exchange section; 5-Second heat exchange section; 6-Water circulation device; 7-Air heat exchanger; 8-Intermediate mixer; 41-Inner ring pipe; 42-Outer sheath; 51-Heat exchange fins; 61-First water tank; 62-Second water tank; 63-Circulating water pump; 71-Outer cylinder; 72-Heat exchange channel; 73-Water injection chamber; 100-First filter element; 200-Second filter element. Detailed Implementation Example 1:

[0017] This embodiment describes a waste incineration flue, such as... Figure 1 As shown, it includes a first direct-flow flue 1, a swirl flue 3, and a second direct-flow flue 2 connected in sequence. The first direct-flow flue 1 and the second direct-flow flue 2 are provided with a first heat exchange section 4 inside, and the swirl flue 3 is provided with a second heat exchange section 5 inside. The first heat exchange section 4 is connected to a water circulation device 6, and the second heat exchange section 5 is connected to an air heat exchanger 7. The water circulation device 6 and the air heat exchanger 7 are connected by an intermediate mixer 8.

[0018] The inlet of the first direct-flow flue 1 is connected to the exhaust of the incineration unit. The high-temperature flue gas generated from waste incineration enters the first direct-flow flue 1 and exchanges heat with the first heat exchange section 4. A water circulation device 6 delivers water as the heat exchange medium to the first heat exchange section 4 to absorb the residual heat from the flue gas. Then, the flue gas enters the swirl flue 3 and swirls along it. Under the centrifugal force generated by the swirl, large particles of soot in the flue gas settle inside the swirl flue 3, achieving preliminary removal of large impurities. Simultaneously, the flue gas exchanges heat with the second heat exchange section 5 inside the swirl flue 3, transferring heat to the air heat exchanger 7 to heat the low-temperature air inside the air heat exchanger 7, achieving waste heat recovery. Finally, the flue gas enters the second direct-flow flue 2 and exchanges heat again with water as the heat exchange medium through the first heat exchange section 4 inside the second direct-flow flue 2, achieving final waste heat recovery.

[0019] Because the temperature of the heat exchange medium water at the first direct-flow flue 1 is higher than that at the second direct-flow flue 2, to ensure water temperature balance, the heat exchange medium water from both the first direct-flow flue 1 and the second direct-flow flue 2 is fed into the intermediate mixer 8 for mixing. The intermediate mixer 8 is connected to the air heat exchanger 7 via an intermediate pipe equipped with a solenoid valve. When the heat from the flue gas inside the swirl flue 3 is insufficient to heat the air inside the air heat exchanger 7, the solenoid valve opens, transferring the heat exchange medium water from the intermediate mixer 8 to the air heat exchanger 7 to assist in heating the air inside the air heat exchanger 7. The air heated in the air heat exchanger 7 can be used for indoor heating, and the high-temperature heat exchange medium water in the water circulation device 6 can also be used for indoor and outdoor heating.

[0020] Furthermore, the bottom of the cyclone flue 3 is equipped with an openable hatch. When the amount of soot settled inside the cyclone flue 3 reaches a certain level, the hatch can be opened to clean the soot inside the cyclone flue 3 and prevent the cyclone flue 3 from becoming blocked. Example 2:

[0021] This embodiment discloses a flue for waste incineration, which is an optimization based on Embodiment 1, such as... Figure 2As shown, the first heat exchange unit 4 includes an inner ring pipe 41 and an outer sleeve 42. The inner ring pipe 41 is disposed inside the flue, and the outer sleeve 42 is sleeved on the outside of the flue. The inner ring pipe 41 is connected to the water circulation device 6, and a cavity is formed between the outer sleeve 42 and the outer side of the flue. The cavity is connected to the water circulation device 6.

[0022] One end of the inner loop pipe 41 is connected to the first water supply end of the water circulation device 6, and the other end of the inner loop pipe 41 is connected to the intermediate mixer 8. The intermediate mixer 8 is connected to the external heat-consuming equipment and the return end of the water circulation device 6. The low-temperature heat exchange medium water from the water circulation device 6 enters the inner loop pipe 41 and fully exchanges heat with the high-temperature flue gas inside the direct-flow flue. The heated heat exchange medium water flows to the intermediate mixer 8, where the heat in the heat exchange medium water is consumed by the external heat-consuming equipment. The cooled heat exchange medium water flows back to the water circulation device 6, realizing the circulation of the circulating medium water. At the same time, the second water supply end of the water circulation device 6 is connected to the cavity formed between the outer sleeve 42 and the outer side of the flue. The heat exchange medium water enters the cavity and further recovers the heat dissipated to the outside of the direct-flow flue. The circulation process of the heat exchange medium water is similar to that of the heat exchange medium water in the inner loop pipe 41.

[0023] Furthermore, such as Figure 2 As shown, the water circulation device 6 includes a first water tank 61, a second water tank 62, and a circulating water pump 63. The first water tank 61 is connected to the inner ring pipe 41 through a first circulation pipe, and the second water tank 62 is connected to the cavity through a second circulation pipe. A circulating water pump 63 is installed on both the first and second circulation pipes. The first water tank 61 and the second water tank 62 are also connected to an intermediate mixer 8.

[0024] The inner ring pipe 41, the first water tank 61, and the intermediate mixer 8 are connected through the first circulation pipeline to form the first set of circulating heat exchange structures. The cavity, the second water tank 62, and the intermediate mixer 8 are connected through the second circulation pipeline to form the second set of circulating heat exchange structures. Through the action of the two sets of circulating heat exchange structures, the heat of the flue gas in the direct-flow flue can be fully absorbed.

[0025] The rest of this embodiment is the same as that of Embodiment 1, so it will not be described again. Example 3:

[0026] This embodiment discloses a flue for waste incineration, which is optimized based on Embodiment 1 or 2, such as... Figure 3As shown, the air heat exchanger 7 includes an outer cylinder 71 and a heat exchange channel 72. A water injection chamber 73 is provided inside the outer cylinder 71, and the heat exchange channel 72 is provided inside the water injection chamber 73. An air inlet pipe is provided at one end of the heat exchange channel 72, and an air outlet pipe is provided at the other end of the heat exchange channel 72. The water injection chamber 73 is connected to the intermediate mixer 8. A second heat exchange section 5 is provided between the air inlet pipe and the interior of the swirl flue 3.

[0027] The water injection chamber 73 is connected to the intermediate mixer 8 via an intermediate pipeline equipped with a solenoid valve. The low-temperature air first exchanges heat with the second heat exchange section 5 in the air inlet pipe to recover the waste heat of the flue gas. Then the air enters the heat exchange channel 72, and the heat exchange medium water in the intermediate mixer 8 enters the water injection chamber 73, and then exchanges heat with the air inside the heat exchange channel 72 to heat the air.

[0028] It should be further explained that if the waste heat from the second heat exchanger 5 is sufficient to heat the air to the predetermined temperature range, the solenoid valve on the intermediate pipeline will close, and the heat exchange medium water will not enter the water injection chamber 73. Instead, all the heat exchange medium water inside the intermediate mixer 8 will be used for external heat-consuming equipment. If the waste heat from the second heat exchanger 5 is insufficient to heat the air to the predetermined temperature range, the solenoid valve on the intermediate pipeline will open, and the heat exchange medium water will enter the water injection chamber 73 to assist in heating the air, so that the air reaches the predetermined temperature range.

[0029] Furthermore, the heat exchange channel 72 is a honeycomb channel. One end of the honeycomb channel is connected to the air inlet pipe via an air inlet hood, and the other end is connected to the air outlet pipe via an air outlet hood. By setting up the honeycomb channel, it is possible to ensure that air exchanges heat with the heat exchange medium water over a larger heat exchange area, thereby improving the efficiency of heating the air.

[0030] The rest of this embodiment is the same as that of embodiment 1 or 2, so it will not be described again. Example 4:

[0031] This embodiment discloses a flue for waste incineration, which is optimized based on any one of embodiments 1-3, such as... Figure 3 As shown, the second heat exchange section 5 includes heat exchange fins 51, one end of which extends into the interior of the inlet pipe, and the other end of which extends into the interior of the swirl flue 3. The heat exchange fins 51 are made of copper to ensure efficient heat transfer of the residual heat from the flue gas inside the swirl flue 3 to the inlet pipe. Simultaneously, to prevent significant heat loss during heat transfer, an insulation layer, such as insulating foam, is applied to the area of ​​the heat exchange fins 51 in contact with the external environment, thereby reducing heat exchange between the heat exchange fins 51 and the external environment.

[0032] The rest of this embodiment is the same as any one of embodiments 1-3, so it will not be described again. Example 5:

[0033] This embodiment discloses a flue for waste incineration, which is optimized based on any one of embodiments 1-4, such as... Figure 1 As shown, a first filter element 100 is provided between the outlet end of the first direct-flow flue 1 and the inlet end of the swirl flue 3, and a second filter element 200 is provided between the outlet end of the swirl flue 3 and the inlet end of the second direct-flow flue 2. The first filter element 100 and the second filter element 200 have the same structure, and the first filter element 100 includes several sets of filter screens arranged in sequence.

[0034] The first filter element 100 and the second filter element 200 perform preliminary filtration of large particulate matter in the flue gas, thereby reducing the content of particulate matter in the flue gas, which helps to further harmlessly treat the flue gas in the subsequent process.

[0035] The rest of the embodiments are the same as any one of embodiments 1-4, and therefore will not be repeated here.

[0036] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. A flue for waste incineration, comprising a first direct-flow flue (1), a swirl flue (3), and a second direct-flow flue (2) connected in sequence, characterized in that, The first direct-flow flue (1) and the second direct-flow flue (2) are provided with a first heat exchange section (4), and the swirl flue (3) is provided with a second heat exchange section (5). The first heat exchange section (4) is connected to the water circulation device (6), and the second heat exchange section (5) is connected to the air heat exchanger (7). The water circulation device (6) and the air heat exchanger (7) are connected by an intermediate mixer (8).

2. The flue for waste incineration according to claim 1, characterized in that, The first heat exchange unit (4) includes an inner ring pipe (41) and an outer sleeve (42). The inner ring pipe (41) is disposed inside the flue, and the outer sleeve (42) is sleeved on the outside of the flue. The inner ring pipe (41) is connected to the water circulation device (6), and a cavity is formed between the outer sleeve (42) and the outer side of the flue. The cavity is connected to the water circulation device (6).

3. A flue for waste incineration according to claim 2, characterized in that, The water circulation device (6) includes a first water tank (61), a second water tank (62), and a circulating water pump (63). The first water tank (61) is connected to the inner ring pipe (41) through a first circulation pipeline, and the second water tank (62) is connected to the cavity through a second circulation pipeline. A circulating water pump (63) is installed on both the first and second circulation pipelines. The first water tank (61) and the second water tank (62) are also connected to an intermediate mixer (8).

4. A flue for waste incineration according to any one of claims 1-3, characterized in that, The air heat exchanger (7) includes an outer cylinder (71) and a heat exchange channel (72). The outer cylinder (71) has a water injection chamber (73) inside. The water injection chamber (73) has a heat exchange channel (72) inside. One end of the heat exchange channel (72) has an air inlet pipe, and the other end of the heat exchange channel (72) has an air outlet pipe. The water injection chamber (73) is connected to the intermediate mixer (8). A second heat exchange section (5) is provided between the air inlet pipe and the interior of the swirl flue (3).

5. A flue for waste incineration according to claim 4, characterized in that, The heat exchange channel (72) is a honeycomb channel. One end of the honeycomb channel is connected to the air inlet pipe through the air inlet hood, and the other end of the honeycomb channel is connected to the air outlet pipe through the air outlet hood.

6. A flue for waste incineration according to claim 5, characterized in that, The second heat exchange section (5) includes heat exchange fins (51), one end of which extends into the interior of the air inlet pipe and the other end of which extends into the interior of the swirl flue (3).

7. A flue for waste incineration according to claim 6, characterized in that, The area of ​​the heat exchange fins (51) in contact with the external environment is covered with an insulation layer.

8. A flue for waste incineration according to any one of claims 1-3, characterized in that, A first filter element (100) is provided between the outlet end of the first direct flue (1) and the inlet end of the swirl flue (3), and a second filter element (200) is provided between the outlet end of the swirl flue (3) and the inlet end of the second direct flue (2).

9. A flue for waste incineration according to claim 8, characterized in that, The first filter element (100) has the same structure as the second filter element (200), and the first filter element (100) includes several groups of filter screens arranged in sequence.

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