Combustion waste gas recovery system and hot air generation system comprising same

Abstract

The utility model discloses a combustion waste gas recovery system which comprises an air return box, the air return box comprises an outer box, the outer box comprises a box plate and an air return cavity in the middle of the box plate, and the box plate is provided with an air inlet and an air outlet which are communicated with the outside; all the partition plates are arranged in the air return cavity, and a ventilation channel is formed between every two adjacent partition plates; one of the upper end and the lower end of each partition plate is connected to the inner wall of the corresponding box plate, a communication space is formed between the other end of each partition plate and the corresponding box plate, and every two adjacent ventilation channels communicate with the air inlets and the air outlets through the communication spaces and communicate with the head ends and the tail ends of the ventilation channels correspondingly. The utility model further discloses a hot air generating system which comprises the combustion waste gas recovery system, a hot air furnace, a heat exchanger and a cyclone dust collector. According to the scheme of the utility model, particulate matters in waste gas are intercepted by adopting a simple and compact structure which is easy to clean, so that the heat of the combustion waste gas can be more efficiently and directly utilized, and the device is more environment-friendly.

Description

Technical Field

[0001] The utility model relates to the technical field of heating equipment, in particular to a combustion exhaust gas recovery system and a hot air generation system including the same. Background Art

[0002] In current production fields such as grain dryers that require a large amount of continuous hot air, hot blast stoves are widely used for heating. The combustion exhaust gas of existing hot blast stoves has been initially heat recovered. Generally, a heat exchanger is used for heat exchange to heat clean air and then reuse it. After the combustion exhaust gas is cooled by heat exchange, it is discharged into the air after simple filtration and purification treatment or even without any treatment. However, this approach has limitations in terms of environmental protection and energy efficiency.

[0003] On the one hand, particulate pollutants that may be contained in the combustion exhaust gas of hot blast stoves with simple treatment or no treatment pose a threat to air quality. The treatment method of the filter screen makes the mesh holes easy to block. The longer the time, the lower the exhaust efficiency, and it is necessary to frequently remove and clean it, which is time-consuming and laborious. On the other hand, the initial temperature of the exhaust gas generated after combustion is as high as several hundred degrees Celsius. Even after the initial heat recovery by heat exchange, it can still reach about 150 degrees Celsius. This part of the heat is directly discharged and wasted, and it will also make the surrounding environmental temperature too high. With the increasing global awareness of environmental protection and the promotion of energy conservation and emission reduction policies, it is particularly important to develop a new type of combustion exhaust gas recovery system and dryer. Summary of the Utility Model

[0004] In order to overcome some deficiencies of the prior art, the purpose of the utility model is to provide a combustion exhaust gas recovery system and a hot air generation system including the same, which use a simple, compact and easy-to-clean structure to intercept particulate matter in the exhaust gas, so that the heat of the combustion exhaust gas can be used more efficiently and directly, and it is more environmentally friendly.

[0005] The purpose of the utility model is achieved by adopting the following technical solutions:

[0006] A combustion exhaust gas recovery system includes a return air box, and the return air box includes:

[0007] An outer box, the outer box includes a box plate and a return air cavity in the middle of the box plate, and air inlets and air outlets are opened on the box plate to communicate with the outside;

[0008] A plurality of partitions, all of which are arranged in the return air cavity, with ventilation channels existing between two adjacent partitions; one of the upper and lower ends of each partition is connected to the inner wall of the box plate, and a connecting space is provided between the other end and the box plate, and two adjacent ventilation channels are connected through the connecting space; the connecting spaces between two adjacent partitions and the box plate are respectively located on the upper and lower sides of the box plate; all of the ventilation channels are connected by the connecting spaces to form an "S"-shaped ventilation channel;

[0009] The air inlet and the air outlet are respectively connected to the head and tail ends of the ventilation channel.

[0010] In some embodiments, all the partitions are arranged parallel to each other and staggered, all the ventilation channels have the same cross-sectional size, and all the connecting spaces have the same size and are not smaller than the cross-sectional size of the ventilation channels.

[0011] In some embodiments, the minimum cross-sectional area of the ventilation channel is not less than the cross-sectional area of the air inlet and / or the air outlet.

[0012] In some embodiments, a plurality of inspection doors are provided below the side of the outer box, and at least one inspection door is provided in each of the communicating spaces below the box panel.

[0013] In some embodiments, the number of the partitions is 6 to 8; the number of the inspection doors is 8 to 10, wherein two inspection doors are respectively located between the outermost partitions on the left and right sides and the box panels on the left and right sides.

[0014] In some embodiments, the angle between the opening direction of the air inlet and the partition is 60° to 120°, and the air outlet is opened on the upper surface of the box plate.

[0015] In some embodiments, a cyclone dust collector is further included, wherein the cyclone dust collector includes an air inlet pipe and an air outlet pipe, the air inlet pipe is used to receive combustion exhaust gas, and the air outlet pipe is connected to the air inlet.

[0016] In some embodiments, a heat exchanger is further included, which includes a hot air channel and a cold air channel. The heat in the hot air channel can be transferred to the cold air channel. The inlet of the hot air channel is used to receive combustion exhaust gas, and the outlet of the hot air channel is connected to the air intake pipe.

[0017] The beneficial effects of the embodiments of the present invention include at least:

[0018] The ventilation channel in the return air box is separated by multiple partitions in the outer box, and the ventilation channel is between the two partitions. In addition, each partition and the box plate are not completely sealed but have connecting spaces. Therefore, when the connecting space connects each ventilation channel, a winding "S"-shaped ventilation channel is formed. When the combustion exhaust gas of the hot air furnace enters the return air box from the air inlet, it needs to move along the "S"-shaped ventilation channel. In the process of multiple turns, the dust particles in it are blocked by the partitions layer by layer and retained in the return air box. Finally, the cleanliness of the exhaust gas out of the air outlet is greatly improved.

[0019] Moreover, the structure of the ventilation channel is different from the ordinary mesh structure. There are no tiny holes, and it is not easy to get blocked. It can be used continuously for a long time, has a low cleaning frequency and is easy to clean. It is suitable for treating exhaust gas containing particulate impurities and improving the utilization rate of heat in the exhaust gas.

[0020] The utility model also provides a hot air generating system, comprising the combustion waste gas recovery system and a hot air furnace, wherein the hot air furnace is provided with a furnace, and the smoke outlet of the furnace is connected to the air inlet.

[0021] The beneficial effects of the embodiments of the present invention include at least:

[0022] This hot air generation system can generate two parts of directly usable heat, one part is clean air heated by the heat of combustion, and the other part is the hot air after the combustion exhaust gas is treated, which greatly improves the energy utilization rate. Among them, the return air box can be directly connected to the smoke outlet of the hot air furnace, which has a good blocking effect on the larger particles of debris generated by the combustion of the hot air furnace and has a good impurity removal effect. Especially in the field of grain drying, the fuel of the hot air furnace is often biomass fuel such as rice husks. These fuels are prone to produce larger particles of dust and some lighter floating objects after combustion and are carried out with the flue gas. The use of the hot air generation system of the utility model can simply and directly intercept these dusts, and it is not easy to cause blockage. The combustion exhaust gas after impurities removal is convenient for direct further utilization.

[0023] The utility model also provides another hot air generating system, comprising the above-mentioned combustion waste gas recovery system, and further comprising a hot air furnace, wherein the hot air furnace is provided with a furnace, and the smoke outlet of the furnace is connected to the inlet of the hot air channel;

[0024] The hot air furnace and the heat exchanger are arranged side by side in front and behind, the return air box is fixed to the middle of the front side of the heat exchanger, the cyclone dust collector is located on the left or right side of the return air box, the air inlet of the return air box is directly connected to the air outlet pipe, and the air outlet pipe is arranged above the box plate.

[0025] The beneficial effects of the embodiments of the present invention include at least:

[0026] In this embodiment, the hot air generation system can generate two parts of directly utilizable heat. One part is the clean air heated by the heat of combustion, and the other part is the hot air after the combustion exhaust gas generated by combustion is treated. The energy utilization rate is greatly improved. Among them, the inventor combines the return air box with the cyclone dust collector and the heat exchanger, taking into account the heat exchange loss of the heat exchanger and the characteristics of the cyclone dust collector. No matter what kind of heat exchanger, the heat exchange efficiency is closely related to the temperature difference. The larger the temperature difference, the higher the heat exchange efficiency. Therefore, in this embodiment, the "primary" combustion exhaust gas at the highest temperature after the combustion of the hot blast stove first passes through the heat exchanger for heat exchange to efficiently heat the clean cold air; then it enters the cyclone dust collector for dust removal, and finally the particulate matter that is difficult to remove completely by the cyclone dust collector is removed twice through the return air box, so that the temperature of the final obtained combustion exhaust gas drops from several hundred degrees Celsius to a more appropriate temperature, and the cleanliness is also greatly improved, and it can be directly introduced into the grain dryer to dry the grain. On the basis of the general heat exchange type waste heat utilization scheme, the present utility model is improved into a scheme that can directly utilize the waste gas itself, improving the energy conversion rate and being beneficial to environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a three-dimensional structural schematic diagram of the return air box in the combustion exhaust gas recovery system of the present utility model;

[0028] Figure 2 is a three-dimensional structural schematic diagram of the return air box after removing the front box board in the combustion exhaust gas recovery system of the present utility model;

[0029] Figure 3 is a schematic diagram of the internal structure of the return air box and the wind direction in the combustion exhaust gas recovery system of the present utility model;

[0030] Figure 4 is a schematic diagram of the internal structure of the return air box and the wind direction in the combustion exhaust gas recovery system of the present utility model;

[0031] Figure 5 is a front view schematic diagram of a hot air generation system of the present utility model;

[0032] DESCRIPTION OF THE REFERENCE NUMERALS:

[0033] Return air box 1, box board 11, return air cavity 12, air inlet 13, air outlet 14, partition board 15, ventilation channel 16, communication space 17, cyclone dust collector 2, intake pipe 21, exhaust pipe 22, heat exchanger 3, hot air channel 31, hot blast stove 4, furnace chamber 41, smoke outlet 42, air outlet box 5. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0034] Below, the present invention is further described in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0035] In the description of this application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0036] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0037] It should be noted that when an element is referred to as being “fixed to” another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or there may be an intermediate element.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used in the specification of the present invention are intended only to describe specific embodiments and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the relevant listed items.

[0039] refer to Figures 1-3 As shown, this embodiment provides a combustion exhaust gas recovery system, including a return air box 1, wherein the return air box 1 includes:

[0040] The outer box includes a box panel 11 and a return air chamber 12 in the middle of the box panel 11. The box panel 11 is provided with an air inlet 13 and an air outlet 14 for communication with the outside world. The return air chamber 12 is the primary space for return air to trap dust. The ventilation ducts described below are also separated from the return air chamber 12 by a partition 15. The air inlet 13 is used for air intake, and the air outlet 14 is used for air discharge.

[0041] A number of partition plates 15 are all arranged in the return air chamber 12, and there is a ventilation channel 16 between adjacent two partition plates 15; one end of the upper and lower ends of each partition plate 15 is connected to the inner wall of the box plate, and there is a communication space 17 between the other end and the box plate. Only one end of the upper and lower ends of each partition plate 15 is connected to the box plate, forming a structure with one end sealed and the other end open. The adjacent two ventilation channels 16 are communicated through the communication space 17; the communication spaces 17 between the adjacent two partition plates 15 and the box plate are respectively located on the upper and lower sides of the box plate, showing an up-and-down staggered distribution as a whole; all the ventilation channels 16 are communicated by the communication spaces 17 to form an "S"-shaped ventilation channel.

[0042] The air inlet 13 and the air outlet 14 are respectively communicated with the head and tail ends of the ventilation channel. The combustion waste gas containing impurities and dust enters the ventilation channel from the air inlet 13. Since the ventilation channel is overall winding and tortuous, the waste gas needs to make multiple sharp turns therein. Due to different centrifugal forces, each turn will cause a part of the dust with different air quality to be blocked and intercepted. After several turns, the dust and impurities become less and less, and finally the cleanliness of the waste gas discharged from the air outlet 14 has been greatly improved.

[0043] In this embodiment, the return air box 1 is preferably made of a metal material (such as stainless steel), which is not only easy to clean, but also can obtain a longer service life. In addition, this structure of the ventilation channel is different from the ordinary mesh sieve structure, without small holes, not easy to be blocked and other problems, can be continuously used for a long time, has a low cleaning frequency and is easy to clean, and is suitable for treating waste gas containing particulate impurities and improving the utilization rate of heat in the waste gas.

[0044] As a preferred scheme of the present utility model, all the partition plates 15 are arranged in a parallel and staggered manner, and the cross-sectional sizes of all the ventilation channels 16 are the same. This structure can make the resistance of the waste gas passing through the ventilation channels 16 basically the same. The sizes of all the communication spaces 17 are the same and not less than the cross-sectional size of the ventilation channels 16. The communication space 17 is the gas turning place, where the resistance is the largest. If its area is smaller than the area of the ventilation channels 16, it is easy to cause the wind speed to be weakened too much, resulting in insufficient subsequent power and weakening the interception effect of dust and impurities.

[0045] As a preferred scheme of the present utility model, the minimum cross-sectional area of the ventilation channel is not less than the cross-sectional area of the air inlet 13 and / or the air outlet 14. The air inlet 13 and the air outlet 14 are respectively the starting and ending places of the combustion waste gas. If the waste gas with a large air volume enters and encounters a ventilation channel with too small an inner diameter, it will cause the wind speed to suddenly become faster, easily causing the dust blocked and deposited in the ventilation channel to be sucked away again, reducing the purification effect.

[0046] As a preferred embodiment of the present utility model, a plurality of inspection doors 18 are further provided below the side surface of the outer box, and at least one inspection door 18 is provided at each of the communication spaces 17 below the box panel. The inspection door 18 is used to observe the internal dust deposition situation and clean the dust. Considering that dust generally deposits below, and the communication space 17 is the place where the gas turning centrifugal force is the largest, the most dust should be deposited here. Setting at least one inspection door 18 here can most intuitively observe the deposition situation and is also convenient for cleaning the dust nearby.

[0047] As a preferred embodiment of the present utility model, the number of the partition plates 15 is 6 to 8. Through experiments, it is found that the partition plates 15 in this range can best balance the overall size and purification efficiency of the return air box 1. Especially 7 partition plates 15 can achieve the best economic benefits; the number of the inspection doors 18 matches the communication space 17, and thus is also related to the number of the partition plates 15. In this embodiment, it is preferred that 2 inspection doors 18 are provided for the communication space 17 located below, and 1 inspection door 18 is respectively located on the front and back of the outer box, which is convenient for the return air box 1 to be installed and used on both the front and back sides. Therefore, the number of the inspection doors 18 is 8 to 10. Among them, two inspection doors 18 are respectively located between the outermost partition plates 15 on the left and right and the box panels 11 on the left and right sides. These two inspection doors 18 are to ensure that the positions between the outermost partition plates 15 on the left and right and the box panels 11 on the left and right sides can also be well cleaned, avoiding the formation of sanitary dead corners.

[0048] As a preferred embodiment of the present utility model, the angle between the opening direction of the air inlet 13 and the partition plate 15 is 60° to 120°, and most preferably 90°. When the waste gas enters the box panel from the air inlet 13, it first contacts the partition plate 15, intercepts the possible sparks and larger particles in the gas while changing the gas flow direction, which is convenient for purifying the gas. The air outlet 14 is opened on the upper surface of the box panel. Preferably, the connection position between the partition plate 15 closest to the air outlet 14 and the box panel is the upper end, so that the waste gas still needs to undergo a final turn when leaving the outer box, and finally, using the characteristic that hot air rises, it can be smoothly discharged and enter the next link.

[0049] As a preferred embodiment of the present utility model, it further includes a cyclone dust collector 2. The cyclone dust collector 2 includes an air inlet pipe 21 and an air outlet pipe 22. The air inlet pipe 21 is used to receive combustion exhaust gas, and the air outlet pipe 22 is communicated with the air inlet 13. The cyclone dust collector 2 is used for primary dust removal in this solution. The cyclone dust collector 2 is a commonly used dust removal device. The dust removal principle is to generate a cyclone by a fan, and with the help of centrifugal force, the dust particles are separated from the air flow and trapped on the inner wall, and then fall into the ash hopper by the action of gravity. After being processed by the cyclone dust collector 2, most of the dust particles larger than 5 μm will be removed, and the remaining dust particles of other sizes will enter the return air box 1 through the air inlet 13 for secondary removal. The cyclone dust collector 2 is large in volume and requires power drive. The air flow velocity ejected from the air outlet pipe 22 is relatively fast, which just cooperates with the small return air box 1 that does not require power drive to achieve the effect of using the power twice, with a compact structure and a small floor area.

[0050] As a preferred embodiment of the present utility model, it further includes a heat exchanger 3. The heat exchanger 3 includes a hot air channel 31 and a cold air channel. The heat in the hot air channel 31 can be conducted to the cold air channel. The inlet of the hot air channel 31 is used to receive combustion exhaust gas, and the outlet of the hot air channel 31 is communicated with the air inlet pipe 21. The heat exchanger 3 first contacts the combustion exhaust gas, which can maximize the temperature difference between the two sides of the heat exchange to improve the heat exchange efficiency. The combustion exhaust gas passing through the heat exchanger 3 comes out from the outlet of the hot air channel 31 and then enters the air inlet pipe 21 of the cyclone dust collector 2 to prepare for the next dust removal operation. This combustion exhaust gas recovery system comprehensively and reasonably considers factors such as heat and air flow velocity, and can achieve a high energy utilization efficiency.

[0051] The present utility model also provides a hot air generation system, which includes the combustion exhaust gas recovery system described above without the cyclone dust collector 2 and the heat exchanger 3, and further includes a hot blast stove 4. The hot blast stove 4 is provided with a furnace chamber 41, and the smoke outlet 42 of the furnace chamber 41 is directly communicated with the air inlet 13. This hot air generation system can generate two parts of directly utilizable heat. One part is the clean air heated by the heat of combustion, and the other part is the hot air after the combustion exhaust gas generated by combustion is processed, and the energy utilization rate is greatly improved. Among them, the furnace chamber 41 of the hot blast stove 4 is the position where the fuel burns, which is used to generate heat and combustion exhaust gas after burning the fuel. The return air box 1 can be directly connected to the smoke outlet 42 of the hot blast stove 4, which has a good blocking effect on the larger particle debris generated by the combustion of the hot blast stove 4, and has a good impurity removal effect. Especially in the field of grain drying, the fuel of the hot blast stove 4 is often biomass fuels such as rice husks. These fuels are prone to generate larger particle dust and some lighter floating substances after combustion and are carried out with the flue gas. By using the hot air generation system of the present utility model, these dusts can be simply and directly intercepted, and it is not easy to cause blockage. The combustion exhaust gas after impurity removal is convenient for further utilization.

[0052] As Figure 4 and 5 shown, the present utility model further provides another hot air generation system, including the combustion exhaust gas recovery system which also has a cyclone dust collector 2 and a heat exchanger. It further includes a hot blast stove 4, the hot blast stove 4 is provided with a furnace chamber 41, and the smoke outlet 42 of the furnace chamber 41 is communicated with the inlet of the hot gas passage 31;

[0053] The hot blast stove 4 and the heat exchanger 3 are arranged side by side front and back. The return air box 1 is fixed in the middle of the front side of the heat exchanger. The cyclone dust collector 2 is located on the left or right side of the return air box 1. The air inlet 13 of the return air box 1 is directly communicated with the air outlet pipe 22, and the air outlet pipe is arranged above the box plate. In the present utility model, preferably, an air outlet box 5 is further provided. The clean exhaust gas treated by the return air box flows into the air outlet box 5, and then flows from the air outlet box 5 into other devices (such as a grain dryer) that require hot gas.

[0054] Figure 4 and 5 The solid arrows in [reference] and [reference] represent the flow direction of the combustion exhaust gas that is about to enter or has entered the cyclone dust collector and has not been dust-removed yet, and the hollow arrows represent the flow direction of the combustion exhaust gas that is passing through or has passed through the cyclone dust collector.

[0055] This hot air generation system can generate two parts of directly utilizable heat. One part is the clean air heated by the heat of combustion, and the other part is the hot gas after the combustion exhaust gas generated by combustion is treated. The energy utilization rate is greatly improved. Among them, the inventor combines the return air box 1 with the cyclone dust collector 2 and the heat exchanger 3, taking into account the heat exchange loss of the heat exchanger 3 and the characteristics of the cyclone dust collector 2. No matter what kind of heat exchanger 3, the heat exchange efficiency is closely related to the temperature difference on both sides of the heat exchange. The larger the temperature difference, the higher the heat exchange efficiency. Therefore, in this embodiment, the "first-hand" combustion exhaust gas with the highest temperature after the combustion of the hot blast stove 4 first passes through the heat exchanger 3 for heat exchange to efficiently heat the clean cold air; then it enters the cyclone dust collector 2 for dust removal, and finally the particulate matter that is difficult to be completely removed by the cyclone dust collector 2 is removed twice through the return air box 1, so that the temperature of the finally obtained combustion exhaust gas drops from several hundred degrees Celsius to a more appropriate temperature, and the cleanliness is also greatly improved, and it can be directly introduced into the grain dryer to dry the grain. On the basis of the general heat exchange type waste heat utilization scheme, the present utility model is improved into a scheme that can directly utilize the exhaust gas itself, improving the energy conversion rate and being beneficial to environmental protection.

[0056] The above-mentioned implementation manners are only the preferred implementation manners of the present utility model, and cannot be used to limit the protection scope of the present utility model. Any non-substantial changes and substitutions made by those skilled in the art on the basis of the present utility model belong to the protection scope required by the present utility model.

Claims

1. A combustion exhaust gas recovery system, characterized in that, It includes a return air box, and the return air box includes: An outer box, which includes a box board and a return air cavity in the middle of the box board. An air inlet and an air outlet are provided on the box board and communicate with the outside; A number of partition boards, all of which are arranged in the return air cavity, and there is a ventilation channel between adjacent two partition boards; one end of the upper and lower ends of each partition board is connected to the inner wall of the box board, and there is a communication space between the other end and the box board. Adjacent two ventilation channels are communicated through the communication space; the communication spaces between adjacent two partition boards and the box board are respectively located on the upper and lower sides of the box board; The air inlet and the air outlet are respectively communicated with the head and the tail ends of the ventilation channel.

2. The combustion exhaust gas recovery system according to claim 1, characterized in that, All the partition boards are arranged in a mutually parallel and staggered manner, the cross-sectional sizes of all the ventilation channels are the same, and the sizes of all the communication spaces are the same and not less than the cross-sectional size of the ventilation channel.

3. The combustion exhaust gas recovery system according to claim 1, wherein, The minimum cross-sectional area of the ventilation channel is not less than the cross-sectional area of the air inlet and / or the air outlet.

4. The combustion exhaust gas recovery system according to claim 1, characterized in that, A number of inspection doors are also provided below the side surface of the outer box, and at least 1 inspection door is provided at each communication space below the box board.

5. The combustion exhaust gas recovery system according to claim 4, wherein The number of the partition boards is 6 to 8; the number of the inspection doors is 8 to 10, and two of the inspection doors are respectively located between the outermost partition boards on the left and right sides and the box boards on the left and right sides.

6. The combustion exhaust gas recovery system according to claim 1, characterized in that, The included angle between the opening direction of the air inlet and the partition boards is 60° to 120°, and the air outlet is provided on the upper surface of the box board.

7. The combustion exhaust gas recovery system according to any one of claims 1 to 6, characterized in that It also includes a cyclone dust collector, which includes an air inlet pipe and an air outlet pipe. The air inlet pipe is used to receive combustion waste gas, and the air outlet pipe is communicated with the air inlet.

8. The combustion exhaust gas recovery system according to claim 7, wherein, It also includes a heat exchanger, which includes a hot air channel and a cold air channel. The heat in the hot air channel can be conducted into the cold air channel. The inlet of the hot air channel is used to receive combustion waste gas, and the outlet of the hot air channel is communicated with the air inlet pipe.

9. A hot air generation system, characterized in that, It includes the combustion waste gas recovery system according to any one of claims 1-6, and also includes a hot blast stove, which is provided with a furnace chamber, and the smoke outlet of the furnace chamber is communicated with the air inlet.

10. A hot air generation system, characterized in that, It includes the combustion waste gas recovery system according to claim 8, and also includes a hot blast stove, which is provided with a furnace chamber, and the smoke outlet of the furnace chamber is communicated with the inlet of the hot air channel; The hot blast stove and the heat exchanger are arranged side by side front and back. The return air box is fixed in the middle of the front side of the heat exchanger. The cyclone dust collector is located on the left or right side of the return air box. The air inlet of the return air box is directly communicated with the air outlet pipe, and the air outlet pipe is arranged above the box board.

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