Combustion-supporting device for double-shaft lime kiln and double-shaft lime kiln

Abstract

The present invention provides a combustion-supporting device for a double-shaft lime kiln and a double-shaft lime kiln. The device includes: an air inlet pipe, a combustion-supporting fan, a first air delivery pipe, a second air delivery pipe, a third air delivery pipe, and a heat exchange mechanism; the air inlet pipe is connected to the inlet of the combustion-supporting fan, the outlet of the combustion-supporting fan is connected to the inlet of the heat exchange mechanism through the first air delivery pipe, the heat exchange mechanism is arranged at the cooling zone of the double-shaft lime kiln, the outlet of the heat exchange mechanism is connected to the combustion-supporting air tuyere of the double-shaft lime kiln through the second air delivery pipe, the heat exchange mechanism exchanges heat between the combustion-supporting air and the lime in the cooling zone, and conveys the combustion-supporting air heated by heat exchange to the combustion-supporting air tuyere; the chimney outlet of the double-shaft lime kiln is connected to the air inlet pipe through the third air delivery pipe to convey the flue gas generated by the double-shaft lime kiln to the air inlet pipe. The present invention realizes the preheating of the combustion-supporting air, reduces the heat consumption of the double-shaft lime kiln, improves the thermal efficiency during the combustion of the double-shaft lime kiln, and reduces the air volume of the lime cooling air during the cooling of the high-temperature lime.

Description

Technical Field

[0001] The present invention relates to the technical field of lime kilns, and in particular, to a combustion-supporting device for a double-chamber lime kiln and a double-chamber lime kiln. Background Art

[0002] A lime kiln is a kiln used to calcine limestone to produce quicklime. The process of a lime kiln is as follows: Limestone and fuel are loaded into the lime kiln and preheated. Decomposition starts at 850 degrees, calcination is completed at 1200 degrees, and then after cooling, it is unloaded outside the kiln, thus completing the production of quicklime products.

[0003] A double-chamber lime kiln consists of two independent kiln chambers. The two kiln chambers are cyclically switched to calcine limestone, and the heat transfer and gas flow transmission between the two kiln chambers are carried out through an intermediate channel. When the double-chamber lime kiln is in calcination, combustion-supporting air needs to be introduced into the kiln body. The combustion-supporting air is mostly ambient air at normal temperature. In this way, after the combustion-supporting air is input into the kiln chamber, it needs to be preheated, which increases the heat consumption of the double-chamber lime kiln. Summary of the Invention

[0004] In view of this, the present invention provides a combustion-supporting device for a double-chamber lime kiln, aiming to solve the problem that the combustion-supporting air being ambient air at normal temperature in the prior art easily increases the heat consumption of the double-chamber lime kiln. The present invention also provides a double-chamber lime kiln with this combustion-supporting device.

[0005] On the one hand, the present invention provides a combustion-supporting device for a double-chamber lime kiln, which includes: an air inlet pipe, a combustion-supporting fan, a first air delivery pipe, a second air delivery pipe, a third air delivery pipe, and a heat exchange mechanism; wherein, the air inlet pipe is connected to the inlet of the combustion-supporting fan, the outlet of the combustion-supporting fan is connected to the inlet of the heat exchange mechanism through the first air delivery pipe, the heat exchange mechanism is used to be arranged at the cooling area of the double-chamber lime kiln, the outlet of the heat exchange mechanism is connected to the combustion-supporting air inlet of the double-chamber lime kiln through the second air delivery pipe, the heat exchange mechanism is used to receive the combustion-supporting air extracted by the combustion-supporting fan, exchange heat between the combustion-supporting air and the lime in the cooling area, and convey the combustion-supporting air with increased temperature after heat exchange to the combustion-supporting air inlet; the chimney outlet of the double-chamber lime kiln is connected to the air inlet pipe through the third air delivery pipe, and is used to convey the flue gas generated by the double-chamber lime kiln to the air inlet pipe, so that the flue gas is mixed with the outside air to form combustion-supporting air.

[0006] Further, in the above combustion-supporting device for a double-chamber lime kiln, the heat exchange mechanism includes: heat exchange tubes; wherein, both ends of the heat exchange tubes are respectively connected to the first air delivery pipe and the second air delivery pipe, the heat exchange tubes are sequentially arranged through the two kiln bodies of the double-chamber lime kiln, and the pipe segments of the heat exchange tubes placed in each kiln body exchange heat with the lime in the cooling area of the corresponding kiln body.

[0007] Further, in the above combustion-supporting device for a double-chamber lime kiln, the pipe segments of the heat exchange tubes placed in each kiln body are all flat.

[0008] Further, in the combustion-supporting device for the double-shaft lime kiln, the pipe sections of the heat exchange pipes placed in each kiln body are spiral.

[0009] Further, in the combustion-supporting device for the double-shaft lime kiln, the heat exchange mechanism includes: a connecting pipe and two heat exchange components; wherein, the two heat exchange components are respectively and correspondingly arranged in the cooling zones of the two kiln bodies of the double-shaft lime kiln; each heat exchange component includes: two parallel mounting plates and a plurality of connecting pipes; each mounting plate is horizontally arranged in the cooling zone of the kiln body, and a preset distance is provided between the two mounting plates to form a heat exchange space, and each mounting plate is provided with a plurality of through holes, and the through holes on the two mounting plates correspond to each other one by one; each connecting pipe is placed in the heat exchange space, and both ends of each connecting pipe are respectively connected to the through holes at the corresponding positions of the two mounting plates, and each connecting pipe is used for conveying lime in the kiln body; both ends of the connecting pipe are respectively and correspondingly communicated with the heat exchange spaces in the two kiln bodies.

[0010] Further, in the combustion-supporting device for the double-shaft lime kiln, a heat-insulating layer is provided on the outer wall of the second air delivery pipe.

[0011] Further, the combustion-supporting device for the double-shaft lime kiln further includes: a dust removal device; wherein, the dust removal device is arranged on the third air delivery pipe and is used for removing dust from the flue gas.

[0012] Further, the combustion-supporting device for the double-shaft lime kiln further includes: a filtering device; wherein, the filtering device is arranged on the first air delivery pipe and is used for filtering the combustion-supporting air.

[0013] Further, in the combustion-supporting device for the double-shaft lime kiln, the oxygen content of the combustion-supporting air is 10% - 20%.

[0014] In the present invention, the combustion-supporting air blower extracts the combustion-supporting air, and the heat exchange mechanism exchanges heat between the combustion-supporting air and the high-temperature lime in the cooling zone of the double-shaft lime kiln, so that the temperature of the combustion-supporting air rises, and then the heated combustion-supporting air is conveyed into the double-shaft lime kiln through the combustion-supporting air outlet. In this way, the high-temperature lime in the cooling zone of the double-shaft lime kiln is used to heat the combustion-supporting air to realize the preheating of the combustion-supporting air. After the heated combustion-supporting air enters the double-shaft lime kiln, the preheating of the combustion-supporting air is reduced, the heat consumption of the double-shaft lime kiln is reduced, the thermal efficiency during the combustion of the double-shaft lime kiln is improved, and the problem that the heat consumption of the double-shaft lime kiln is easily increased due to the normal-temperature ambient air as the combustion-supporting air in the prior art is solved. At the same time, the temperature of the high-temperature lime in the cooling zone of the double-shaft lime kiln can also be reduced, the air volume of the lime cooling air during the cooling of the high-temperature lime is reduced, the cooling of the high-temperature lime is accelerated, the energy utilization rate is improved, and the flue gas generated by the double-shaft lime kiln is mixed with the normal-temperature air to form the combustion-supporting air, which inhibits the generation of nitrogen oxides, and thus reduces the emission of nitrogen oxides.

[0015] On the other hand, the present invention also provides a double-chamber lime kiln, which includes any of the above-described combustion-supporting devices for a double-chamber lime kiln.

[0016] Since the combustion-supporting device for a double-chamber lime kiln has the above effects, the double-chamber lime kiln with the combustion-supporting device also has corresponding technical effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not to be considered as limiting the present invention. Moreover, throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0018] Figure 1 It is a schematic structural diagram of the combustion-supporting device for a double-chamber lime kiln provided by an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the drawings. Although the exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be fully conveyed to those skilled in the art. It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0020] Device Embodiment:

[0021] See Figure 1 , Figure 1The figure is a schematic structural diagram of a combustion-supporting device for a double-chamber lime kiln provided by an embodiment of the present invention. As shown in the figure, the combustion-supporting device for a double-chamber lime kiln includes: an air inlet pipe 1, a combustion-supporting fan 2, a first air delivery pipe 3, a second air delivery pipe 4, a third air delivery pipe 5, and a heat exchange mechanism. Among them, the first end of the air inlet pipe 1 is an open end, and the second end of the air inlet pipe 1 is connected to the inlet of the combustion-supporting fan 2. The outlet of the combustion-supporting fan 2 is connected to the first end of the first air delivery pipe 3, and the second end of the first air delivery pipe 3 is connected to the inlet of the heat exchange mechanism. The combustion-supporting fan 2 is used to extract combustion-supporting air and deliver the combustion-supporting air to the heat exchange mechanism through the first air delivery pipe 3. The heat exchange mechanism is used to be arranged at the cooling area 74 of the double-chamber lime kiln 7. The outlet of the heat exchange mechanism is connected to the first end of the second air delivery pipe 4, and the second end of the second air delivery pipe 4 is connected to the combustion-supporting air inlet 75 of the double-chamber lime kiln 7. The heat exchange mechanism is used to receive the combustion-supporting air extracted by the combustion-supporting fan 2, exchange heat between the combustion-supporting air and the high-temperature lime in the cooling area 74, so that the temperature of the combustion-supporting air rises, while the temperature of the high-temperature lime drops, and deliver the combustion-supporting air with increased temperature after heat exchange to the combustion-supporting air inlet 75. The combustion-supporting air enters the interior of the double-chamber lime kiln through the combustion-supporting air inlet 75.

[0022] As known to those skilled in the art, the double-chamber lime kiln 7 has a combustion-supporting air pipeline, and the combustion-supporting air pipeline is provided with a combustion-supporting air inlet 75. The combustion-supporting air inlet 75 receives the combustion-supporting air, and the combustion-supporting air pipeline delivers the combustion-supporting air to the interiors of the two kiln bodies 71 from the tops of the two kiln bodies 71 respectively. The interior of each kiln body 71 of the double-chamber lime kiln 7 is sequentially divided into: a preheating area 72, a calcination area 73, and a cooling area 74 from top to bottom, and these three areas are interconnected. Among them, the cooling area 74 is used to cool the high-temperature lime. During cooling, the lime cooling fan 9 extracts normal-temperature ambient air as lime cooling air and delivers the lime cooling air to the cooling areas 74 of the two kiln bodies 71, and cools the high-temperature lime through the lime cooling air, so that the temperature of the lime drops. The double-chamber lime kiln 7 has a chimney 8, and the chimney outlet is used to output the flue gas generated inside the kiln body 71.

[0023] The chimney outlet of the double-chamber lime kiln 7 is connected to the first end of the third air delivery pipe 5, and the second end of the third air delivery pipe 5 is connected to the air inlet pipe 1. The chimney outlet of the double-chamber lime kiln 7 is used to deliver the flue gas generated by the double-chamber lime kiln 7 to the air inlet pipe 1. Inside the air inlet pipe 1, the flue gas is mixed with the outside air, and the mixed gas forms combustion-supporting air. Specifically, while keeping the air-fuel ratio (the volume ratio of combustion-supporting air to fuel) unchanged, purified low-temperature and low-oxygen flue gas is extracted from the chimney outlet and added to the outside air to form combustion-supporting air, reducing the oxygen content in the combustion-supporting air, adjusting sub-oxygen combustion inside the kiln, forming a strongly reducing combustion environment, inhibiting the generation of nitrogen oxides, achieving a low-nitrogen combustion effect, and ultimately reducing the emission of nitrogen oxides in the flue gas.

[0024] Preferably, the oxygen content of the combustion-supporting air is 10% to 20%, forming oxygen-deficient combustion in the kiln body 71, inhibiting the generation of nitrogen oxides, and reducing the emission of nitrogen oxides.

[0025] It can be seen that in this embodiment, the combustion-supporting air blower 2 extracts the combustion-supporting air, and the heat exchange mechanism exchanges heat between the combustion-supporting air and the high-temperature lime in the cooling zone 74 of the double-chamber lime kiln 7, so that the temperature of the combustion-supporting air rises. Then, the heated combustion-supporting air is transported into the double-chamber lime kiln 7 through the combustion-supporting air inlet 75. In this way, the high-temperature lime in the cooling zone 74 of the double-chamber lime kiln 7 is used to heat the combustion-supporting air to realize the preheating of the combustion-supporting air. After the heated combustion-supporting air enters the double-chamber lime kiln 7, the preheating of the combustion-supporting air is reduced, the heat consumption of the double-chamber lime kiln 7 is reduced, the thermal efficiency during the combustion of the double-chamber lime kiln 7 is improved, and the problem that the combustion-supporting air being ambient air at room temperature in the prior art easily increases the heat consumption of the double-chamber lime kiln is solved. At the same time, the temperature of the high-temperature lime in the cooling zone 74 of the double-chamber lime kiln 7 can also be reduced, the air volume of the lime cooling air during the cooling of the high-temperature lime is reduced, the cooling of the high-temperature lime is accelerated, the energy utilization rate is improved, and the flue gas generated by the double-chamber lime kiln 7 is mixed with the ambient air at room temperature to form the combustion-supporting air, inhibiting the generation of nitrogen oxides, and thus reducing the emission of nitrogen oxides.

[0026] See Figure 1 , an implementation manner of the heat exchange mechanism is shown in this embodiment: The heat exchange mechanism includes: a heat exchange tube 6. Wherein, both ends of the heat exchange tube 6 are respectively connected to the first air duct 3 and the second air duct 4, that is, the first end of the heat exchange tube 6 is connected to the second end of the first air duct 3, and the second end of the heat exchange tube 6 is connected to the first end of the second air duct 4.

[0027] The heat exchange tube 6 sequentially passes through the two kiln bodies 71 of the double-chamber lime kiln 7, and the tube section of the heat exchange tube 6 placed in each kiln body 71 exchanges heat with the lime in the cooling zone 74 of the corresponding kiln body 71. Specifically, the first end and the second end of the heat exchange tube 6 are respectively placed outside the two kiln bodies 71 of the double-chamber lime kiln 7, the heat exchange tube 6 sequentially passes through the cooling zones 74 of the two kiln bodies 71, and the heat exchange tube 6 is used to receive the combustion-supporting air transported from the first air duct 3 and transport the combustion-supporting air into the second air duct 4, and then into the combustion-supporting air inlet 75. When the combustion-supporting air flows in the heat exchange tube 6 and reaches the tube section of the heat exchange tube 6 placed in each kiln body 71, the combustion-supporting air exchanges heat with the high-temperature lime in the cooling zone 74 of the kiln body 71, so that the temperature of the combustion-supporting air rises, while the temperature of the high-temperature lime decreases.

[0028] Preferably, the tube section of the heat exchange tube 6 placed in each kiln body 71 is flat. Specifically, the tube section of the heat exchange tube 6 in each kiln body 71 being flat can effectively increase the heat exchange area between the combustion-supporting air and the high-temperature lime, ensure sufficient heat exchange between the combustion-supporting air and the high-temperature lime, and ensure the sufficient preheating and temperature rise of the combustion-supporting air.

[0029] Preferably, the tube sections of the heat exchange tubes 6 placed in each kiln body 71 are spiral. Specifically, the tube sections of the heat exchange tubes 6 in each kiln body 71 are spiral, which extends the path of the combustion-supporting air in the heat exchange tubes 6, thereby effectively extending the heat exchange time between the combustion-supporting air and the high-temperature lime, ensuring sufficient heat exchange between the combustion-supporting air and the high-temperature lime, and ensuring sufficient preheating and temperature rise of the combustion-supporting air.

[0030] During specific implementation, the tube sections of the heat exchange tubes 6 in each kiln body 71 are spirally arranged from bottom to top in the cooling zone 74 of the kiln body 71, that is, the tube sections of the heat exchange tubes 6 in each kiln body 71 are arranged in a coil shape.

[0031] It can be seen that in this embodiment, the combustion-supporting air in the heat exchange tubes 6 exchanges heat with the high-temperature lime in the cooling zone 74 of the kiln body 71, so that the combustion-supporting air is preheated and the temperature rises, and the high-temperature lime is cooled. In this way, not only can the combustion-supporting air be preheated, reducing the heat consumption in the kiln body 71, but also the temperature of the high-temperature lime can be reduced, reducing the air volume of the lime cooling air when cooling the high-temperature lime, playing an energy-saving role, accelerating the cooling of the high-temperature lime, and improving the energy utilization rate.

[0032] Another implementation manner of the heat exchange mechanism is shown in this embodiment: The heat exchange mechanism includes: a connecting pipe and two heat exchange components. Among them, the two heat exchange components correspond to the two kiln bodies 71 of the double-chamber lime kiln 7 one by one, and each heat exchange component is arranged in the cooling zone 74 of the corresponding kiln body 71.

[0033] Each heat exchange component includes: two parallel mounting plates (not shown in the figure) and a plurality of connecting pipes (not shown in the figure). Among them, the two mounting plates are arranged in parallel, and there is a preset distance between the two mounting plates, and this preset distance can be determined according to the actual situation, and this embodiment does not make any restrictions on this. Each mounting plate is horizontally arranged in the cooling zone 74 of the kiln body 71, and the gap between the two mounting plates forms a heat exchange space, and this heat exchange space is arranged in the cooling zone 74.

[0034] Each mounting plate is provided with a plurality of through holes, the number of through holes on the two mounting plates is the same, and the through holes on the two mounting plates correspond to each other one by one. Preferably, the through holes on each mounting plate are spaced and evenly arranged.

[0035] Each connecting pipe is placed in the heat exchange space. Moreover, both ends of each connecting pipe are respectively connected to the through holes at the corresponding positions of the two mounting plates. Each connecting pipe is used to convey lime in the kiln body 71. Specifically, the number of connecting pipes is the same as the number of through holes on the mounting plate. One end of a connecting pipe is connected to one through hole on one mounting plate, and the other end of the connecting pipe is connected to the corresponding through hole on the other mounting plate. Then, the connecting pipe and the corresponding through holes on the two mounting plates form through channels, and there are multiple through channels. High-temperature lime in the corresponding kiln body 71 is conveyed in each through channel. That is, the high-temperature lime in the calcination zone 73 of the kiln body 71 passes through the through holes on the upper mounting plate, then enters the connecting pipe, and is output from the through holes of the lower mounting plate.

[0036] Both ends of the connecting pipe are respectively connected to the heat exchange spaces in the two kiln bodies 71 in a one-to-one correspondence. Specifically, one end of the connecting pipe is connected to the heat exchange space in one kiln body 71, and the other end of the connecting pipe is connected to the heat exchange space in the other kiln body 71. The second end of the first air supply pipe 3 is connected to the heat exchange space in one kiln body 71, and the first end of the second air supply pipe 4 is connected to the heat exchange space in the other kiln body 71. In this way, the combustion-supporting air in the first air supply pipe 3 is conveyed into the heat exchange space in one kiln body 71. The combustion-supporting air exchanges heat with the high-temperature lime in each connecting pipe in this heat exchange space, so that the temperature of the combustion-supporting air rises, while the temperature of the high-temperature lime drops. The heated combustion-supporting air is conveyed through the connecting pipe into the heat exchange space in the other kiln body 71. The combustion-supporting air exchanges heat with the high-temperature lime in each connecting pipe in this heat exchange space, so that the temperature of the combustion-supporting air rises, while the temperature of the high-temperature lime drops. The heated combustion-supporting air is conveyed through the second air supply pipe 4 to the combustion-supporting air outlet 75.

[0037] It can be seen that in this embodiment, the combustion-supporting air is sequentially conveyed into the heat exchange spaces in the two kiln bodies 71. The combustion-supporting air exchanges heat with the high-temperature lime in each connecting pipe in the heat exchange space, so that the combustion-supporting air is preheated and its temperature rises, and the high-temperature lime is cooled. In this way, not only can the combustion-supporting air be preheated, reducing the heat consumption in the kiln body 71, but also the temperature of the high-temperature lime can be reduced, reducing the air volume of the lime cooling air when cooling the high-temperature lime, reducing the power consumption, accelerating the cooling of the high-temperature lime, and improving the energy utilization rate.

[0038] In the above embodiments, a heat-insulating layer is provided on the outer wall of the second air supply pipe 4. This heat-insulating layer can insulate the heated combustion-supporting air and prevent the temperature of the heated combustion-supporting air from dropping.

[0039] In the above embodiments, the combustion-supporting device for the double-chamber lime kiln may further include: a dust removal device. Among them, the dust removal device is arranged in the third air supply pipe 5, and the dust removal device is used to remove dust from the flue gas to ensure the cleanliness of the flue gas.

[0040] Preferably, the combustion-supporting device for the double-shaft lime kiln further includes: a filtering device. The filtering device is arranged on the first air delivery pipe 3 and is used for filtering the combustion-supporting air to remove the dust in the combustion-supporting air.

[0041] In summary, in this embodiment, the high-temperature lime in the cooling zone 74 of the double-shaft lime kiln 7 is used to heat the combustion-supporting air to realize the preheating of the combustion-supporting air. After the preheated combustion-supporting air enters the double-shaft lime kiln 7, the preheating of the combustion-supporting air is reduced, the heat consumption of the double-shaft lime kiln 7 is lowered, the thermal efficiency during the combustion of the double-shaft lime kiln 7 is improved. At the same time, the temperature of the high-temperature lime in the cooling zone 74 of the double-shaft lime kiln 7 can also be reduced, the air volume of the lime cooling air during the cooling of the high-temperature lime is decreased, the cooling of the high-temperature lime is accelerated, and the energy utilization rate is improved. Moreover, the flue gas generated by the double-shaft lime kiln 7 is mixed with normal-temperature air to form the combustion-supporting air, inhibiting the generation of nitrogen oxides, and thus reducing the emission of nitrogen oxides.

[0042] Embodiment of the double-shaft lime kiln:

[0043] This embodiment also provides a double-shaft lime kiln, which includes: any of the above-mentioned combustion-supporting devices for the double-shaft lime kiln. The specific implementation process of the combustion-supporting device for the double-shaft lime kiln can be referred to the above description, and will not be elaborated here.

[0044] Since the combustion-supporting device for the double-shaft lime kiln has the above effects, the double-shaft lime kiln with the combustion-supporting device also has corresponding technical effects.

[0045] It should be noted that the principles of the combustion-supporting device for the double-shaft lime kiln and the double-shaft lime kiln in the present invention are the same, and the relevant parts can be referred to each other.

[0046] It should be noted that in the description of the present invention, the terms indicating the direction or position relationship such as "upper", "lower", "left", "right", "inner", "outer", etc. are based on the direction or position relationship shown in the drawings. This is only for convenience of description, rather than indicating or implying that the device or component must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation of the present invention.

[0047] In addition, it should also be noted that in the description of the present invention, unless otherwise clearly defined and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0048] Obviously, those skilled in the art can make various modifications and variations to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims

1. A combustion-supporting device for a double-shaft lime kiln, characterized in that, Comprising: An air inlet pipe (1), a combustion-supporting fan (2), a first air delivery pipe (3), a second air delivery pipe (4), a third air delivery pipe (5), and a heat exchange mechanism; wherein, The air inlet pipe (1) is connected to the inlet of the combustion-supporting fan (2), the outlet of the combustion-supporting fan (2) is connected to the inlet of the heat exchange mechanism through the first air delivery pipe (3), the heat exchange mechanism is used to be arranged at the cooling zone (74) of the double-chamber lime kiln (7), the outlet of the heat exchange mechanism is connected to the combustion-supporting air inlet (75) of the double-chamber lime kiln (7) through the second air delivery pipe (4), the heat exchange mechanism is used to receive the combustion-supporting air extracted by the combustion-supporting fan (2), exchange heat between the combustion-supporting air and the lime in the cooling zone (74), and convey the combustion-supporting air with increased temperature after heat exchange to the combustion-supporting air inlet (75); The chimney outlet of the double-chamber lime kiln (7) is connected to the air inlet pipe (1) through the third air delivery pipe (5), and is used to convey the flue gas generated by the double-chamber lime kiln (7) to the air inlet pipe (1), so that the flue gas is mixed with the outside air to form the combustion-supporting air, thereby reducing the oxygen content in the combustion-supporting air to adjust the under-oxygen combustion inside the double-chamber lime kiln (7); The heat exchange mechanism includes: heat exchange tubes (6); wherein, both ends of the heat exchange tubes (6) are respectively connected to the first air delivery pipe (3) and the second air delivery pipe (4), the heat exchange tubes (6) are sequentially arranged through the two kiln bodies (71) of the double-chamber lime kiln (7), and the pipe sections of the heat exchange tubes (6) placed in each kiln body (71) exchange heat with the lime in the cooling zone (74) of the corresponding kiln body (71); or, The heat exchange mechanism includes: a connecting pipe and two heat exchange components; wherein, the two heat exchange components are respectively arranged in the cooling zones of the two kiln bodies (71) of the double-chamber lime kiln (7) in a one-to-one correspondence manner; Each heat exchange component includes: two parallel installation plates and a plurality of connecting pipes; each installation plate is horizontally arranged in the cooling zone (74) inside the kiln body (71), a preset distance is provided between the two installation plates to form a heat exchange space, each installation plate is provided with a plurality of through holes, and the through holes on the two installation plates correspond to each other one by one; each connecting pipe is placed in the heat exchange space, and both ends of each connecting pipe are respectively connected to the through holes at the corresponding positions of the two installation plates, and each connecting pipe is used to convey the lime in the kiln body (71); Both ends of the connecting pipe are respectively connected to the heat exchange spaces in the two kiln bodies (71) in a one-to-one correspondence manner.

2. The combustion-supporting device for a double-shaft lime kiln according to claim 1, wherein, The pipe sections of the heat exchange tubes (6) placed in each kiln body (71) are flat.

3. The combustion-supporting device for a double-shaft lime kiln according to claim 1, characterized in that, The pipe sections of the heat exchange tubes (6) placed in each kiln body (71) are spiral.

4. The combustion-supporting device for a double-shaft lime kiln according to claim 1, characterized in that, A heat preservation layer is arranged on the outer wall of the second air delivery pipe (4).

5. The combustion-supporting device for a double-shaft lime kiln according to claim 1, wherein, Further comprising: A dust removal device; wherein, The dust removal device is arranged on the third air delivery pipe (5) and is used to remove dust from the flue gas.

6. The combustion-supporting device for a double-shaft lime kiln according to claim 1, characterized in that, Further comprising: A filtering device; wherein, The filtering device is arranged in the first air delivery pipe (3) and is used for filtering the combustion-supporting air.

7. The combustion-supporting device for a double-shaft lime kiln according to claim 1, characterized in that, The oxygen content of the combustion-supporting air is 10% to 20%.

8. A double-shaft lime kiln, characterized in that, Comprising: The combustion-supporting device for a double-shaft lime kiln according to any one of claims 1 to 7.

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