Combustion tower and heating furnace

Abstract

The utility model discloses a combustion tower and a heating furnace, and belongs to the field of photovoltaic cells. The combustion tower comprises a heat exchange pipe, an air inlet mechanism, a heating chamber and a heat recovery chamber, wherein the air intake mechanism is configured to communicate with the heating furnace. The heating chamber heats the flowing waste gas, and the heated waste gas enters the heat recovery chamber. The input end of the heat exchange pipe communicates with an external air source, and the output end of the heat exchange pipe communicates with the heating furnace. And the heated waste gas in the heat recovery chamber heats gas flowing in from an external gas source in the heat exchange pipe inside the heat recovery chamber, and the heated gas flows into the heating furnace through the output end of the heat exchange pipe. According to the combustion tower, waste gas can be preheated through the heating chamber, then gas in the heat exchange pipe is heated through the waste gas in the heat recovery chamber, and therefore hot airflow of the gas can be formed and can be input into the heating furnace to take away the waste gas.

Description

Technical Field

[0001] This application belongs to the field of photovoltaic cells, especially the field of wafer production. In particular, this application relates to a combustion tower and a heating furnace. Background Art

[0002] In the wafer production process, it is necessary to go through a drying process to cure the grid lines printed on the wafers, and it is also necessary to go through a sintering process to form a eutectic contact between the grid lines and the silicon substrate. In order to take away and discharge the waste gas generated during drying or sintering, it is necessary to inject gas into the furnace body of the heating furnace (drying furnace or sintering furnace) through an external gas source to form an air flow, drive the waste gas into the combustion tower connected to the furnace body, and the combustion tower fully heats and burns the waste gas before discharging it to ensure that the discharged waste gas meets the exhaust gas standard.

[0003] The gas injected into the furnace body will impact the temperature of the furnace body, causing the temperature inside the furnace to decrease. In order to counteract the abnormal temperature decrease in the furnace body caused by the injected gas, the heating elements inside the furnace body need a higher heating power, thereby consuming more industrial electricity, which undoubtedly increases the production cost. Summary of the Utility Model

[0004] The solution of the example of this application is implemented through the following content.

[0005] In a first aspect, this application discloses a combustion tower, which includes: at least one heat exchange tube and an intake mechanism, a heating chamber, and a heat recovery chamber that are interconnected, where:

[0006] The intake mechanism is configured to communicate with the heating furnace to divert the waste gas in the heating furnace to the heating chamber;

[0007] The heating chamber heats the waste gas flowing through it, and the heated waste gas enters the heat recovery chamber;

[0008] The input end of the heat exchange tube is in communication with the outside gas or a gas source device, the output end of the heat exchange tube is in communication with the heating furnace, at least a part of the heat exchange tube is located in the heat recovery chamber, and the heated waste gas in the heat recovery chamber heats the gas flowing into the heat exchange tube from the external gas source, and the heated gas in the heat exchange tube flows into the heating furnace through the output end of the heat exchange tube.

[0009] The combustion tower and the photovoltaic cell heat treatment device of the example of this application can be used for heat recovery and utilization of the waste gas generated during the heat treatment (such as drying, sintering) of photovoltaic cells. In the combustion furnace, the waste gas heats the gas transported in the heat exchange tube to form a hot gas with a relatively higher temperature, and then the hot gas is introduced into the heating furnace.

[0010] The combustion furnace of this example in the present application accesses the exhaust gas (with a certain temperature) discharged during the heat treatment process of the photovoltaic cell through the air intake mechanism. The exhaust gas is preheated in the heating chamber of the combustion furnace. Then, the further heated exhaust gas heats the gas in the heat exchange tubes arranged in the heat recovery chamber of the combustion furnace, and then the heated gas is input into the heating furnace.

[0011] In some embodiments, at least two baffle plates are arranged at intervals along the flow direction of the exhaust gas in the heating chamber, and each baffle plate is provided with through holes; the through holes of two adjacent baffle plates are not coaxial to form a staggered arrangement.

[0012] The arrangement of the baffle plates can standardize the flow path of the exhaust gas, and the staggered arrangement of the through holes of two adjacent baffle plates horizontally makes the exhaust gas pass along a zigzag path, which helps to improve the uniformity of the distribution of the exhaust gas in the box body of the combustion furnace subsequently.

[0013] In some embodiments, the number of heating chambers is at least two.

[0014] Multiple heating chambers can heat the exhaust gas multiple times, so that it reaches a higher temperature before heat recovery. At the same time, multiple heating chambers can also avoid heat loss during the transportation of the exhaust gas to some areas in the box body.

[0015] In some embodiments, the heating chamber is provided with resistance wires or infrared lamp tubes for heating, and the air intake mechanism includes a first fan, and the first fan is configured to draw the exhaust gas from the heating furnace into the combustion tower.

[0016] The heating method of the resistance wires has the advantages of simple structure, fast heating speed, convenient setting, low cost, etc.; the infrared lamp tubes have the advantages of easy cleaning, convenient installation and replacement, etc.

[0017] In some embodiments, the combustion tower further includes a wind distribution chamber, the wind distribution chamber is located between the heating chamber and the heat recovery chamber, and a perforated plate with multiple wind distribution holes is arranged in the wind distribution chamber, and the wind distribution chamber is used to make the heated exhaust gas evenly distributed along the cross section of the box body.

[0018] The wind distribution chamber can make the exhaust gas evenly distributed in the cross-sectional area of the box body of the combustion furnace, so that better contact and heat exchange can be carried out during subsequent heat recovery, so that the whole normal temperature air can be heated.

[0019] The non-hole area of the perforated plate can block the passage of the exhaust gas, thereby changing the movement track of the exhaust gas, so that it diffuses everywhere along the plate surface of the perforated plate, and then continues to flow forward through the holes everywhere, thereby improving the uniformity of its distribution.

[0020] In some embodiments, the number of mesh plates is at least two, and they are arranged at intervals along the flow direction of the exhaust gas, and the multiple air holes of two adjacent mesh plates are staggered in the transverse direction.

[0021] The hole distribution of the mesh plate can be staggered to further enhance the dispersion of the flow path of the exhaust gas, thereby increasing the distribution uniformity.

[0022] In some embodiments, the combustion tower also includes a condensation chamber for cooling the exhaust gas. The condensation chamber is connected to the heat recovery chamber and is located at the rear of the heat recovery chamber. A condenser is arranged in the condensation chamber. The condenser includes a winding pipe. The water inlet and outlet of the pipe are located on the same side surface of the condensation chamber. The pipe is connected to a heat sink.

[0023] The condenser can reduce the temperature of the waste gas after heat recovery, which is convenient for subsequent treatment or discharge. At the same time, it can also separate and recover some substances in the waste gas, which also helps to recover some costs and meet higher waste gas emission standards. The winding pipeline can increase the heat exchange area, so as to better cool the waste gas.

[0024] The heat sink helps to increase the contact area with the exhaust gas, which can increase the heat dissipation efficiency and increase the speed of lowering the temperature.

[0025] In some embodiments, a filter element is disposed at the input end of the heat exchange tube, and the filter element is configured to filter the air entering the input end of the heat exchange tube.

[0026] By setting up the filter, various dust and impurities are prevented from entering the heat exchange pipe and finally entering the furnace body, causing pollution or even damage to the sheet.

[0027] In some embodiments, the combustion tower further comprises an air outlet mechanism installed at the rear of the heat recovery chamber, the air outlet mechanism comprises an air guide pipe and an air outlet pipe, the air outlet pipe is arranged vertically, a first end of the air guide pipe is connected to the end of the heat recovery chamber, and a second end of the air guide pipe is connected to the middle of the air outlet pipe;

[0028] The air outlet mechanism also includes an air outlet oil collecting pan connected to the lower end of the air outlet pipe.

[0029] The air outlet mechanism can be used to guide the path of the exhaust gas leaving the combustion furnace. For example, by setting a vertical air outlet pipe, the different components in the exhaust gas can be separated according to their specific gravity during the transportation process.

[0030] The air outlet oil collecting pan can be used to carry the cooled and solidified organic phase during the air outlet process, so as to facilitate special waste treatment or recycling, and also reduce the substances in the exhaust gas that are inconvenient to be discharged.

[0031] In some embodiments, the heat exchange tube has a heat exchange section located in the heat recovery chamber, and the heat exchange section extends in a bow shape or in a spiral shape.

[0032] The heat exchange section located in the heat recovery chamber constructed in the above form can increase the air heating time, so that the air is fully heated.

[0033] In some embodiments, the combustion tower includes at least two heat exchange tubes and a gas collecting mechanism. The output ends of the at least two heat exchange tubes are connected to the gas collecting mechanism in gas communication. The gas collecting mechanism includes a gas collecting tray and a gas transmission pipeline. The output ends of the at least two heat exchange tubes are connected to the gas collecting tray in gas communication. The gas collecting tray is configured to collect the gas output from the at least two heat exchange tubes and be connected to one end of the gas transmission pipeline in gas communication. The other end of the gas transmission pipeline is connected to the heating furnace in gas communication.

[0034] By providing a gas collecting mechanism, the length of the heat exchange tubes can be reduced. Especially on the premise of at least two heat exchange tubes, it can avoid too many gas pipelines being difficult to maintain, saving costs and space.

[0035] In some embodiments, the pipe section of the heat exchange tube between the heat recovery chamber and the heating furnace is wrapped with a heat insulation layer.

[0036] In some embodiments, the input end of the heat exchange tube is in communication with the outside gas. The gas collecting mechanism further includes a second fan. The second fan is arranged on the gas transmission pipeline and is configured to promote the air in the gas transmission pipeline to flow towards the heating furnace at an accelerated speed.

[0037] The input end of the heat exchange tube is directly in communication with the outside, and the second fan is used to promote the air to flow along the gas transmission pipeline, eliminating the need to set up a gas pipe connected to a high-pressure gas source device, saving space.

[0038] Setting a heat insulation layer in the heat insulation section can prevent the heated gas from cooling down after leaving the heat recovery chamber, that is, prevent the heated gas from cooling.

[0039] In another aspect of the present application, a heating furnace is disclosed, including: a furnace for heating, a conveying mechanism for conveying wafers, the conveying mechanism being located inside the furnace body and along the length direction of the furnace body, and a combustion tower; wherein the intake mechanism is connected to the furnace body and in gas communication, the waste gas generated in the furnace body enters the combustion tower through the intake mechanism, the output end of the heat exchange tube in the combustion tower is connected to the furnace body, and the gas heated by the waste gas discharged from the output end is introduced into the furnace body.

[0040] The first fan can provide power for the conveyance of the waste gas, enabling the waste gas to quickly enter the combustion tower, improving the treatment efficiency of the waste gas in the subsequent process, and at the same time facilitating the discharge of the waste gas in the heat treatment equipment of the photovoltaic cell.

[0041] Beneficial effects:

[0042] Compared with directly introducing normal-temperature air into the heat treatment equipment of a photovoltaic cell, the solution of this application conducts heat recovery on the waste gas, thereby not only reducing the temperature of the waste gas (facilitating subsequent emissions and separation of different components such as the organic phase), but also heating the normal-temperature air through heat recovery, and further reducing the temperature fluctuation in the heating furnace when it is introduced.

[0043] At the same time, compared with the solution of first heating the normal-temperature air and then introducing it into the heat treatment equipment of the photovoltaic cell, the exemplary solution of this application utilizes the heat of the waste gas, so it can also reduce and avoid the problem of increased costs caused by heating the normal-temperature air. Brief Description of the Drawings

[0044] For a clearer illustration, the drawings required for the description will be briefly introduced below.

[0045] Figure 1 It is a schematic structural diagram of the heating furnace in the example of this application;

[0046] Figure 2 is Figure 1 a schematic cross-sectional structural diagram of the shown heating furnace;

[0047] Figure 3 It is a schematic structural diagram of the wind baffle arranged in the heating chamber in the combustion furnace of the example of this application;

[0048] Figure 4 Discloses a schematic structural diagram of the first fan in the combustion furnace of the example of this application;

[0049] Figure 5 Discloses a schematic structural diagram of the air outlet mechanism in the combustion furnace of the example of this application;

[0050] Figure 6 Shows a schematic structural diagram of the perforated plate in the combustion furnace of the example of this application.

[0051] Description of the Reference Numerals:

[0052] 100 - Combustion tower, 101 - Heat exchange tube;

[0053] 200 - Heating furnace, 201 - Furnace body, 202 - Intake mechanism, 203 - First fan;

[0054] 104 - Air outlet mechanism, 1041 - Air outlet pipe, 1042 - Air guide pipe, 1043 - Air outlet oil collecting tray, 105 - Gas collecting mechanism;

[0055] 301 - Wind baffle, 302 - Through hole, 303 - Mesh hole;

[0056] 401 - Perforated plate, 402 - Air equalizing hole;

[0057] 501 - Condensation chamber, 502 - Heat recovery chamber, 503 - Air distribution chamber, 504 - First heating chamber, 505 - Transition chamber, 506 - Second heating chamber. Detailed implementation mode

[0058] During the production process of photovoltaic wafers, it is often necessary to use a heating furnace to dry the grid lines printed on the surface of the wafers (using a drying furnace device), or sinter the wafers that have been dried (using a sintering furnace). For the sake of simplicity in description and to avoid unnecessary details, the aforementioned heating and sintering can be uniformly described as heat treatment.

[0059] The heating furnace used in the above heat treatment process generally includes a furnace body for heating that extends along a certain horizontal straight line direction, and there are also multiple heating elements and an air intake structure arranged in the furnace body. The air intake structure is usually located at a certain position in the first half of the furnace body. Optionally, the air intake structure can be located at the head end of the furnace body. The heating elements are used to raise the temperature inside the furnace body, and the air intake structure will input the ambient normal temperature air in the workshop or the normal temperature air provided by the gas source equipment into the furnace body to carry away the high-temperature waste gas.

[0060] Due to the requirements of the production process, the intake air needs to meet a predetermined flow rate to fully promote the flow of waste gas and timely carry away the high-temperature waste gas. Therefore, it is necessary to inject more normal temperature air into the furnace body, which will in turn cause the temperature inside the furnace body to decrease abnormally, thus affecting the drying and sintering effects of the wafers. In order to ensure that the furnace body temperature meets the requirements of the production process, only the power of the heating elements can be increased to offset the abnormal temperature drop caused by the entry of more normal temperature air. However, such a setting will significantly increase the production cost.

[0061] In order to overcome the above problems, a combustion tower 100 is disclosed in the present application, and a heating furnace 200 is also constructed based on the combustion tower 100.

[0062] Next, please refer to Figures 1 to 6 , the description of the combustion tower 100 and the heating furnace 200 in the examples of the present application.

[0063] The combustion tower 100 is connected to the furnace body of the drying furnace or the sintering furnace, and is a device used to heat the waste gas during the drying and sintering stages and then discharge it after being utilized. Specifically, the solution of the present application provides a combustion tower 100 with a heat recovery function. The combustion tower 100 uses the heat of the waste gas to heat the normal temperature air that is about to enter the furnace body 201 to form high-temperature air. By inputting this high-temperature air into the heating furnace or the sintering furnace, the waste gas can be carried away, and the problem of abnormal temperature reduction inside the furnace can also be avoided.

[0064] Please refer to Figure 1 and Figure 2, generally speaking, the combustion tower 100 includes: at least one heat exchange tube 101, and an air intake mechanism 202, a heating chamber, and a heat recovery chamber 502 that are interconnected.

[0065] The air intake mechanism 202 therein is configured to communicate with the heating furnace 200 to divert the exhaust gas in the heating furnace 200 to the heating chamber (in the illustrated solution of this application, it is exemplified as the first heating chamber 504 and the second heating chamber 506).

[0066] Specifically, the air intake mechanism 202 extracts gas from the furnace body of the heating furnace 200, not only sucking the exhaust gas into the combustion tower 100, but also creating a certain negative pressure in the furnace body to promote the injection of new gas (preheated air). Optionally, the air intake mechanism 202 extracts gas from the rear half of the furnace body of the heating furnace 200, for example, more specifically, extracts gas from the tail end of the furnace body of the heating furnace 200, and the gas contains exhaust gas.

[0067] The heating chamber heats (or preheats) the exhaust gas flowing through it, and the heated exhaust gas will then be transported downstream or to the subsequent process and enter the heat recovery chamber 502.

[0068] The input end of the heat exchange tube 101 is in communication with the outside air or a gas source device for receiving fresh normal temperature air. At the same time, the output end of the heat exchange tube 101 is in communication with the heating furnace 200 to input the heated high-temperature air into the furnace body of the heating furnace 200. Correspondingly, the heat exchange tube 101 is at least partially located in the heat recovery chamber 502 so as to be able to exchange heat with the high-temperature hot exhaust gas to heat the normal temperature air in the heat exchange tube.

[0069] For the convenience of discussion, the part of the heat exchange tube 101 located in the heat recovery chamber 502 can be named the heat exchange section. Optionally, the structure of the heat exchange section can be designed as an arch shape or in a spiral, so as to increase the time of the normal temperature air in the heat recovery chamber 502, increase the length of the heat exchange section, increase the contact area, and extend the contact time, so that the normal temperature air can be fully heated.

[0070] The exhaust gas heated in the heat recovery chamber 502 heats the gas in the heat exchange tube 101. At the same time, the gas heated in the heat exchange tube 101 flows into the heating furnace 200 through the output end of the heat exchange tube 101.

[0071] In the above process, the exhaust gas can be evenly distributed so that the exhaust gas discharged from the drying furnace or sintering furnace and input into the combustion furnace can be heated more fully and evenly, thereby achieving a better effect of heating the normal temperature air in the heat exchange tube.

[0072] Therefore, to achieve the above effects, at least two baffle plates 301 arranged at intervals along the flow direction of the exhaust gas can be selected to be provided in the heating chamber of the combustion tower 100. Refer toFigure 2 and Figure 3 Each of the windshields 301 is provided with a through hole 302, and the through holes 302 of two adjacent windshields 301 are not coaxial to form a staggered arrangement with each other.

[0073] Through the above-described construction method of the windshields 301, the exhaust gas can be forced to flow along a substantially S-shaped trajectory. Therefore, through the staggered arrangement of the through holes 302 of the windshields 301, the exhaust gas can be more fully distributed throughout the heating chamber instead of being locally distributed, thereby facilitating subsequent utilization.

[0074] It can be seen therefrom that due to the restriction of the flow trajectory of the exhaust gas, the exhaust gas can have a relatively large conveying power, so that it can be conveyed forward in the combustion tower 100. Therefore, as Figure 4 shown, the intake mechanism 202 can be configured with a first fan 203, and correspondingly, the first fan 203 is configured to draw the exhaust gas from the furnace body 201 into the combustion tower 100, thereby providing the power for the exhaust gas to be conveyed forward in the heating chamber and increasing the exhaust gas flow rate.

[0075] As an alternative implementation for heating the exhaust gas in the heating chamber, a heating wire or an infrared lamp tube for generating heat can be provided in the heating chamber. Of course, other heating devices can also be used, without special limitation.

[0076] For an example of the heating wire, the heating wire can be wound around a heating rod, and both ends of the heating rod pass through two corresponding mesh holes 303 on both sides of the windshield 301 to achieve fixation; or, the heating wire is woven into a mesh and uniformly arranged in the heating chamber.

[0077] Based on the consideration of the heating effect and the need to further increase the temperature of the exhaust gas, the number of heating chambers can be increased, for example, set to at least two. Taking two heating chambers as an example, they are respectively denoted as the first heating chamber 504 and the second heating chamber 506.

[0078] When there are multiple heating chambers, these heating chambers can be arranged in sequence and connected to each other two by two. Therefore, the exhaust gas can pass through each heating chamber in sequence. Further, in other examples, a transition zone (which can be defined by a transition chamber 505 correspondingly) can also be provided between two adjacent heating chambers (which can define a combustion zone).

[0079] At the position after the exhaust gas is heated in the heating chamber (i.e., after leaving the heating chamber), a wind distribution chamber 503 can also be configured in the combustion tower 100. As the name implies, the wind distribution chamber 503 is a structure for making the wind distribution uniform. In an example, the wind distribution chamber 503 is located between the heating chamber (in the example with two heating chambers, it is the second heating chamber 506) and the heat recovery chamber 502, and the wind distribution chamber 503 is used to make the heated exhaust gas uniformly distributed along the cross-section of the box body.

[0080] In order to make the waste gas uniform, in the example, a perforated plate 401 with a plurality of (or at least one) air distribution holes 402 can be arranged in the air distribution chamber 503. Refer to Figure 6 . To improve the uniformity of the air distribution, the number of the perforated plates 401 can be set to at least two. These perforated plates 401 are arranged at intervals along the flow direction of the waste gas, and the plurality of air distribution holes 402 of two adjacent perforated plates 401 are arranged staggeredly horizontally.

[0081] In the heat recovery chamber 502, the heat of the heated waste gas is used to heat the normal temperature / low temperature gas input from an external gas source, while the temperature of the waste gas itself decreases. However, considering that the temperature of the waste gas may not decrease significantly, and if the waste gas is directly discharged in this way, there may be inconveniences and it does not meet the environmental requirements in all aspects. Therefore, a condensation chamber 501 for cooling the waste gas can also be arranged in the combustion tower 100 to significantly reduce the temperature of the waste gas.

[0082] In terms of position, it is located in the back section of the heat recovery chamber 502, and the condensation chamber 501 is also communicated with the heat recovery chamber 502. Then, after the waste gas passes through the heat recovery chamber 502, it will also flow into the condensation chamber 501 and be further cooled in the condensation chamber 501 compared with the heat recovery chamber 502.

[0083] In some specific implementations, the cooling method of the condensation chamber 501 is, for example, to arrange a condenser in the condensation chamber 501. The condenser can include a meandering cooling pipeline, and the water inlet and outlet of the cooling pipeline can be located on the same side surface of the condensation chamber 501.

[0084] Such a setting can increase the length of the cooling pipeline, improve the contact area during cooling, and also improve the cooling efficiency, so that the waste gas is cooled to a greater extent. The water inlet and outlet on the same side can facilitate the configuration of various pipeline and valve structural components that are adapted to the condensation pipeline in some usage scenarios.

[0085] To further improve the heat exchange effect (transfer more heat of the waste gas to the heat exchange medium in the condensation pipe), heat dissipation fins can be arranged on the outer wall of the cooling pipeline. The heat dissipation fins can increase the medium area and the contact time of cooling, so that the temperature of the waste gas is significantly / greatly reduced.

[0086] After being cooled by the condenser, the temperature of the waste gas is effectively reduced and can be discharged for subsequent utilization or emission. Correspondingly, for the purpose of discharge, the combustion tower 100 can also include, for example, an air outlet mechanism 104 installed in the back section of the heat recovery chamber 502, such as Figure 5As shown. As an example, the air outlet mechanism 104 may include, for example, a duct 1042 and an air outlet pipe 1041. Among them, the air outlet pipe 1041 is vertically arranged, and the first end of the duct 1042 communicates with the end of the heat recovery chamber 502, and the second end of the duct 1042 communicates with the middle of the air outlet pipe 1041. Further, the air outlet mechanism 104 further includes an air outlet oil collecting tray 1043 connected to the lower end of the air outlet pipe 1041.

[0087] In this way, during the process of the exhaust gas being discharged outside the combustion furnace through the air outlet mechanism 104, the organic oil phase in the exhaust gas can be converted from a gas to a liquid, so that it moves downward under the action of gravity, while the gas moves upward. Thus, the oil phase and the gas are separated, the gas can be subjected to subsequent treatment, and the oil phase can be collected in the oil collecting tray.

[0088] In short, after the exhaust gas leaves the combustion tower 100 along the air outlet pipe 1041, it can enter the waste discharge pipe of the workshop, and the solid matter (such as tar, alkanes, etc.) falls into the lower oil collecting tray.

[0089] In some feasible embodiments, to avoid the chaos of the machine platform air pipes, occupation of space, and increase in maintenance difficulty caused by too many heat exchange pipes 101, please refer to Figure 2 the gas collecting mechanism 105 in Figure 2 shows a feasible implementation manner of the gas collecting mechanism 105, that is: the gas collecting mechanism 105 includes a hollow frustum-shaped gas collecting tray and a gas transmission pipe (not shown). The lower bottom surface of the gas collecting tray is hollowed out and is hermetically connected to the outside of the heat recovery chamber 502 (specifically, it can be the outer side of the heat recovery chamber 502 where the output ends of the heat exchange pipes 101 are located). The output ends of all the heat exchange pipes 101 extend into the gas collecting tray, so that the heated air output by all the heat exchange pipes 101 is collected in the gas collecting tray. An air outlet is provided on the upper bottom surface of the gas collecting tray, and the area of the upper bottom surface of the gas collecting tray is smaller than the area of the lower bottom surface.

[0090] The inlet of the gas transmission pipe is docked with the air outlet of the gas collecting tray, and the other end is connected to the furnace body gas (specifically, the other end of the gas transmission pipe can be connected to the gas of the intake structure of the furnace body), so that the heated air can be smoothly introduced into the furnace body. Optionally, the shape of the gas collecting tray is not limited to a frustum, as long as the radius of the gas collecting tray gradually becomes smaller along the moving direction of the internal air, the purpose of gathering the gas can be achieved.

[0091] Further, considering that the temperature of the heated gas decreases after leaving the heat recovery chamber 502, a heat insulation layer can be provided on the outside of the gas collecting tray and / or the gas transmission pipe. Optionally, the heat insulation layer can be rigid polyurethane foam, glass wool pipe shell, rock wool, rubber and plastic heat insulation material, or polyurethane foam, etc., or a combination of two or more of the above materials.

[0092] To ensure that the input end of the heat exchange tube 101 obtains clean air, a filter element can be provided at the input end of the heat exchange tube 101. The filter element can be at least one of filter cotton, activated carbon packets, metal meshes with dense and fine mesh holes, etc., or any combination of more.

[0093] In addition, when the input end of the heat exchange tube 101 is directly connected to the outside to obtain air, the movement of air in the heat exchange tube 101 may be relatively slow, and it is difficult to form a sufficient flow rate to carry away the waste gas. Therefore, a second fan can also be provided on the gas transmission pipeline. The second fan can promote the air inside the gas transmission pipeline to accelerate and flow towards the heating furnace to ensure that the air flow rate meets the process requirements.

[0094] Based on the above combustion furnace 100, as an example of its application, an example of the present application also discloses a heating furnace 200.

[0095] The heating furnace 200 includes a furnace body 201, a conveying mechanism (not shown), and the above combustion tower 100.

[0096] Among them, the furnace body 201 is used for heating, for example, for performing at least one of the foregoing drying and sintering. The conveying mechanism is used to convey wafers (photovoltaic wafers); the position of the conveying mechanism is inside the furnace body 201, and the conveying mechanism extends along the length direction of the furnace body 201.

[0097] The air intake mechanism 202 of the combustion tower 100 is connected to the furnace body 201, and the air intake mechanism 202 and the furnace body 201 are in gas communication, so that gas can be transmitted between the two.

[0098] During the use of the heating furnace 200, the waste gas generated in the furnace body 201 (which can be a gas substance containing various organic phases and water) enters the above combustion tower 100 through the air intake mechanism 202, and the output end of the heat exchange tube 101 in the combustion tower 100 is connected to the furnace body 201, and the gas discharged from the output end (after being heated by the waste gas) is introduced into the furnace body 201.

[0099] The furnace body 201 can be provided with multiple furnace bodies, and the waste gas discharged from the above output end can be distributed to each furnace body through a pipeline system.

[0100] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, one or more embodiments are described above with reference to the accompanying drawings. Among them, similar reference numerals are used throughout the text to refer to similar components. In the above description, for the purpose of explanation, many specific details are set forth in order to provide a more thorough understanding of one or more embodiments. However, it is obvious that in various cases, one or more embodiments can be practiced without these specific details, and the various embodiments can be combined and cross-referenced with each other on the premise of not being contradictory.

[0101] It should be noted that the terms "first", "second", etc. in the description, claims and above-mentioned drawings of this application are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of this application described here can be implemented in an order other than those illustrated or described here.

[0102] In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or are inherent to these processes, methods, products or devices.

[0103] The structure, features and effects of this application have been described in detail based on the embodiments shown in the drawings above. The above are only the preferred embodiments of this application, but the scope of implementation of this application is not limited by what is shown in the drawings. Any changes made in accordance with the concept of this application, or equivalent embodiments modified to equivalent changes, should still be within the protection scope of this application as long as they do not exceed the spirit covered by the description and drawings.

Claims

1. A combustion tower, characterized in that: The combustion tower comprises: at least one heat exchange tube and an air intake mechanism, a heating chamber, and a heat recovery chamber which are interconnected, wherein: The air intake mechanism is configured to communicate with the heating furnace to guide the exhaust gas in the heating furnace to the heating chamber; The heating chamber heats the exhaust gas flowing through it, and the heated exhaust gas enters the heat recovery chamber; The input end of the heat exchange tube is connected to the external gas or to the gas source equipment, and the output end of the heat exchange tube is connected to the heating furnace. The heat exchange tube is at least partially located in the heat recovery chamber. The exhaust gas heated in the heat recovery chamber heats the gas flowing into the heat exchange tube from the external gas source, and the heated gas in the heat exchange tube flows into the heating furnace through the output end of the heat exchange tube.

2. The combustion tower according to claim 1, characterized in that At least two wind shields are arranged in the heating chamber at intervals along the flow direction of the exhaust gas, each wind shield is provided with a through hole; the through holes of two adjacent wind shields are not coaxial to form a mutually staggered arrangement; And / or, the number of the heating chambers is at least two.

3. The combustion tower according to claim 1 or 2, characterized in that: The heating chamber is provided with a resistance wire or an infrared lamp tube for heating, and the air intake mechanism includes a first fan, which is configured to draw the exhaust gas from the heating furnace into the combustion tower.

4. The combustion tower according to claim 1, characterized in that The combustion tower also includes an air distribution chamber, which is located between the heating chamber and the heat recovery chamber. A mesh plate with a plurality of air distribution holes is arranged in the air distribution chamber, and the air distribution chamber is used to evenly distribute the heated exhaust gas along the cross-section of the box body.

5. The combustion tower according to claim 4, characterized in that: The number of the mesh plates is at least two, and they are arranged at intervals along the flow direction of the exhaust gas, and the multiple air distribution holes of two adjacent mesh plates are staggered in the transverse direction.

6. The combustion tower according to claim 1, characterized in that: The combustion tower also includes a condensation chamber for cooling the exhaust gas, the condensation chamber is connected to the heat recovery chamber and is located at the rear of the heat recovery chamber, a condenser is arranged in the condensation chamber, the condenser includes a winding cooling pipeline, a water inlet and a water outlet of the cooling pipeline are located on the same side surface of the condensation chamber, and a heat sink is arranged on the outer wall of the cooling pipeline.

7. The combustion tower according to claim 1, characterized in that: A filter is provided at the input end of the heat exchange tube, and the filter is configured to filter the air entering the input end of the heat exchange tube.

8. The combustion tower according to claim 1, characterized in that: The combustion tower also includes an air outlet mechanism installed at the rear of the heat recovery chamber, the air outlet mechanism includes an air guide pipe and an air outlet pipe, the air outlet pipe is vertically arranged, the first end of the air guide pipe is connected to the end of the heat recovery chamber, and the second end of the air guide pipe is connected to the middle of the air outlet pipe; The air outlet mechanism also includes an air outlet oil collecting pan connected to the lower end of the air outlet pipe.

9. The combustion tower according to claim 1, characterized in that: The heat exchange tube has a heat exchange section located in the heat recovery chamber, and the heat exchange section extends in a bow shape or in a spiral shape.

10. The combustion tower according to claim 1, characterized in that: The combustion tower includes at least two heat exchange tubes and a gas collecting mechanism, the gas collecting mechanism includes a gas collecting plate and a gas transmission pipeline, the output ends of at least two of the heat exchange tubes are connected to the gas of the gas collecting plate, the gas collecting plate is configured to collect the gas output from at least two of the heat exchange tubes and is connected to one end of the gas transmission pipeline, and the other end of the gas transmission pipeline is connected to the gas of the heating furnace.

11. The combustion tower according to claim 10, characterized in that: The gas collecting plate and / or the gas transmission pipeline are / is covered with a heat-insulating layer.

12. The combustion tower according to claim 10, characterized in that: The input end of the heat exchange tube is connected to the external gas. The gas collecting mechanism also includes a second fan, which is arranged on the gas pipeline and configured to accelerate the air in the gas pipeline to flow toward the heating furnace.

13. A heating furnace, characterized in that: include: A furnace body for heating, and a conveying mechanism for conveying a sheet, wherein the conveying mechanism is located inside the furnace body and extends along the length direction of the furnace body; as well as According to the combustion tower according to any one of claims 1 to 12, the air intake mechanism is connected to the furnace body and the gas is connected, the exhaust gas generated in the furnace body enters the combustion tower through the air intake mechanism, the output end of the heat exchange tube in the combustion tower is connected to the furnace body, and the gas discharged from the output end and heated by the exhaust gas is passed into the furnace body.

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