Inlet air preheating mechanism and heating furnace

Abstract

The air inlet preheating mechanism comprises an air inlet pipeline, the air inlet pipeline comprises an air inlet section, a preheating section and an air conveying section which are sequentially communicated, the air inlet section is connected with air source equipment, the preheating section is arranged along the inner side face or the outer side face of a waste discharge pipeline, and the air conveying section is used for being communicated with a heating furnace body. Therefore, normal-temperature air provided by the air source equipment enters the preheating section through the air inlet section and enters the heating furnace body from the air conveying section after being heated by the preheating section, the situation that the temperature of the heating furnace body changes greatly after the air enters the heating furnace body is prevented, heating pieces in the furnace body can be set to be lower in power, and cost is saved.

Description

Technical Field

[0001] The present application relates to the field of photovoltaic module production equipment, and specifically to an air intake preheating mechanism and a heating furnace. Background Art

[0002] In the production process of photovoltaic cells, a heating furnace is needed to dry the grid lines printed on the surface of the cells or to sinter the cells that have been dried. The heating furnace usually includes multiple heating furnace bodies, each of which is equipped with a heating element and an air intake structure. The heating element is used to increase the temperature of the furnace body, and the air intake structure injects room temperature air provided by the air source equipment in the workshop into the furnace body to reduce the temperature of the furnace body and take away the high-temperature exhaust gas.

[0003] Due to the requirements of the production process, the intake air must meet the predetermined flow rate to fully carry away the high-temperature exhaust gas, so it is necessary to inject more room-temperature air into the furnace body, which in turn causes the temperature inside the furnace body to drop abnormally, affecting the drying or sintering effect of the battery cells. In order to ensure that the furnace body temperature meets the requirements of the production process, the power of the heating element can only be increased to offset the abnormal temperature drop caused by the entry of more room-temperature air. Such a setting will significantly increase production costs. Utility Model Content

[0004] In order to solve the technical problem that the existing furnace air intake will have an adverse effect on the battery cell processing and increase the production cost, the present application provides an air intake preheating mechanism, which adopts the following technical solutions:

[0005] An air intake preheating mechanism, characterized in that the air intake preheating mechanism is installed on a frame of a heating furnace, the heating furnace includes multiple heating furnace bodies and an exhaust gas treatment mechanism, the exhaust gas treatment mechanism is connected to the heating furnace bodies, the exhaust gas treatment mechanism includes an exhaust pipe for discharging high-temperature exhaust gas in the heating furnace body, the air intake preheating mechanism includes an air intake pipe, the air intake pipe includes an air intake section, a preheating section, and a gas transmission section that are connected in sequence, the air intake section is connected to an air source equipment in a workshop, the preheating section is arranged along the inner side or the outer side of the exhaust pipe, the gas transmission section is used to communicate with the heating furnace body, so that normal temperature air provided by the air source equipment enters the preheating section through the air intake section, and enters the heating furnace body from the gas transmission section after being heated by the preheating section.

[0006] The air intake preheating mechanism provided in the present application can use the discharged high-temperature exhaust gas to preheat the normal-temperature air provided by the air source equipment. The preheated air enters the furnace body, which can reduce the adverse effects of the intake air on the battery cells and more finely control the temperature reduction. At the same time, the heating element in the furnace body can be set to a lower heating power, thereby saving production costs. In addition, the heat of the high-temperature exhaust gas is taken away, which is conducive to the collection and treatment of tar substances in the high-temperature exhaust gas.

[0007] In some embodiments, the preheating section is disposed around the inner side of the waste discharge pipe.

[0008] The preheating section is located inside the exhaust pipe to facilitate the high-temperature exhaust gas to heat the preheating section after passing through the preheating section, and the heating effect is better.

[0009] In some embodiments, at least one pair of through holes is provided on the side wall of the waste discharge pipe, the air intake section is connected to the preheating section through one of the through holes, and the preheating section is connected to the air delivery section through another through hole.

[0010] By arranging pairs of through holes on the side plates of the exhaust pipe, installation, commissioning and maintenance of the air intake section, preheating section and gas transmission section are facilitated.

[0011] In some embodiments, an annular groove is circumferentially arranged on the outer side surface of the waste discharge pipe, and the preheating section is installed in the annular groove and extends along the annular groove.

[0012] The exhaust pipe is heated by the high-temperature exhaust gas passing through, and the preheating section is arranged in the annular groove on the outer surface of the exhaust pipe so that the preheating section can also be heated, thereby heating the air inside the preheating section.

[0013] In some embodiments, the gas transmission section is provided with a temperature sensor, which is used to detect the temperature of the gas inside the gas transmission section and send the result to the control system in real time.

[0014] By setting a temperature sensor in the gas transmission section, the preheating effect can be intuitively understood, so as to adjust the heating power, air intake flow rate and other settings in the furnace body according to the preheating effect.

[0015] In some embodiments, the gas delivery section is an insulated gas pipe.

[0016] Use an insulated air pipe to transport the preheated air to prevent the preheated air from cooling down and losing the preheating effect.

[0017] In some embodiments, thermal insulation cotton is provided on the outer surface of the gas transmission section.

[0018] The heat preservation is carried out by wrapping the outer surface of the gas transmission section with heat insulation cotton, which is easy to disassemble and maintain and has low cost.

[0019] In some embodiments, the thermal insulation cotton is ceramic fiber paper with single-sided aluminum foil.

[0020] Using ceramic fiber paper with single-sided aluminum foil as thermal insulation cotton can save costs while maintaining excellent thermal insulation effects.

[0021] In some embodiments, the gas inlet section or the gas delivery section is provided with a flow meter for controlling the gas flow rate.

[0022] By setting a flow meter, it is convenient to control the gas flow in the air intake pipe, and it can be adjusted according to actual needs.

[0023] A heating furnace, comprising a frame, a conveying mechanism, a plurality of heating furnace bodies arranged adjacent to each other and connected to each other, at least one exhaust gas treatment mechanism, and at least one intake air preheating mechanism, wherein:

[0024] A plurality of heating furnace bodies are arranged on the frame along a first horizontal direction, and the plurality of heating furnace bodies are used for drying or sintering the battery cells;

[0025] At least one exhaust gas treatment mechanism is disposed on the frame, the at least one exhaust gas treatment mechanism is connected to at least one heating furnace body, and the exhaust gas treatment mechanism is configured to discharge high-temperature exhaust gas generated in the connected heating furnace body;

[0026] The conveying mechanism passes through a plurality of heating furnace bodies and at least one exhaust gas treatment mechanism, and the conveying mechanism is used to convey the battery sheet along a first horizontal direction;

[0027] The air intake preheating mechanism is arranged on the frame, and is configured to send the high-pressure air provided by the air source device to the exhaust pipe of the exhaust gas treatment mechanism for heating, and send the heated high-pressure air to the connected heating furnace body.

[0028] By providing at least one air intake preheating mechanism, the heating furnace body can receive preheated air, thereby preventing the temperature inside the furnace body from being abnormally lowered due to the temperature of the injected gas.

[0029] In some embodiments, a plurality of air intake preheating mechanisms are installed on the exhaust pipe of each exhaust gas treatment mechanism, and the gas delivery sections of the plurality of air intake preheating mechanisms are respectively connected to a heating furnace body.

[0030] By arranging a plurality of air intake preheating mechanisms, each heating furnace body can receive preheated air. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a partial structural schematic diagram of the heating furnace in the present application at a first viewing angle;

[0032] Figure 2 is a partial structural schematic diagram of the heating furnace in the present application at a second viewing angle;

[0033] Figure 3 is a schematic structural diagram of the air intake preheating mechanism in the present application from a third viewing angle;

[0034] Figures 1 to 3 Included:

[0035] 1-heating furnace; 11-heating furnace body; 2-air intake preheating mechanism; 21-air intake section; 22-preheating section; 23-gas transmission section;

[0036] 3- Waste gas treatment mechanism; 31- Waste gas discharge pipe. DETAILED DESCRIPTION

[0037] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0038] like Figure 1 , Figure 2 As shown, the air intake preheating mechanism 2 and the exhaust gas treatment mechanism 3 are both installed on the frame of the heating furnace 1, and the exhaust gas treatment mechanism 3 is connected to the heating furnace body 11. A plurality of heating furnace bodies 11 are arranged in sequence and connected to each other. A heating element is arranged in the heating furnace body 11 to increase the temperature in the heating furnace body 11 so as to dry or sinter the battery cells with the grid lines printed. During the drying or sintering process, the grid line slurry of the battery cells will volatilize high-temperature organic waste gas due to the high temperature. The high-temperature organic waste gas in each heating furnace body 11 will flow into the exhaust gas treatment mechanism 3 and finally enter the exhaust gas collection pipe of the workshop.

[0039] Alternatively, if Figure 1 The exhaust gas treatment mechanism 3 can be located at one end of a plurality of heating furnace bodies 11 arranged in sequence, and connected to the heating furnace body 11 located at one end of the plurality of heating furnace bodies 11; it can also be arranged between two adjacent heating furnace bodies 11, and connected to both of the two adjacent heating furnace bodies 11.

[0040] Optionally, the heating furnace body 11 needs to regulate the temperature and discharge the generated waste gas. The heating furnace body 11 includes a heating element and an air intake structure. The air intake structure can be arranged above the furnace body and connected to the air intake preheating mechanism 2.

[0041] like Figure 3 As shown, the air intake preheating mechanism 2 includes an air intake section 21, a preheating section 22, and a gas delivery section 23 which are connected in sequence. The air intake section 21 is connected to an air source device provided by the workshop. The air source device can provide high-pressure, normal temperature air to the air intake section 21. The air enters the preheating section 22 through the air intake section 21, and is heated while moving along the gas channel inside the preheating section 22. The heated air then enters the gas delivery section 23, and finally enters the heating furnace body 11.

[0042] The waste gas treatment mechanism 3 includes a waste gas discharge pipe 31, and the high-temperature organic waste gas usually flows upward along the waste gas discharge pipe 31. Optionally, the preheating section 22 is arranged inside the waste gas discharge pipe 31, and the waste gas can directly heat the preheating section 22 when passing through the preheating section 22; or optionally, the outer surface of the waste gas discharge pipe 31 is provided with a groove surrounding the waste gas discharge pipe 31, and the preheating section 22 is arranged inside the groove, which can also be heated, and is clean and easy to maintain.

[0043] Furthermore, when the preheating section 22 is arranged inside the exhaust pipe 31, it can be arranged in a ring shape, extending like a spring. Such an arrangement will extend the contact area between the preheating section 22 and the exhaust gas, so that the exhaust gas is heated more fully.

[0044] To facilitate installation, debugging and maintenance, through holes can be set in pairs in the exhaust pipe 31, the inlet of the preheating section 22 is connected to the air intake section 21 through one of the through holes, and the outlet of the preheating section 22 is connected to the air delivery section 23 through another through hole.

[0045] To facilitate observation of the air temperature after preheating, a temperature sensor may be disposed on the gas movement path of the preheating section 22. After the temperature sensor measures the temperature, the result is sent to the control system in real time and displayed on the touch screen for easy observation by the operator.

[0046] In order to prevent the preheated air from losing heat when being transmitted along the gas transmission section 23, the pipeline of the gas transmission section 23 can be set as an insulation pipeline; or optionally, a layer of insulation layer is wrapped on the outer surface of the gas transmission section 23, and the insulation layer can be made of insulation materials such as insulation cotton. Furthermore, the insulation layer can be made of ceramic fiber paper with single-sided aluminum foil.

[0047] To facilitate the control of the gas flow rate, a flow meter for controlling the gas flow rate can be provided in the gas inlet section 21 or the gas delivery section 23, so that the temperature can be more finely regulated. In addition, more gas path control elements can be provided on the gas inlet pipeline for practical needs.

[0048] like Figure 1 or Figure 2 As shown, another feasible embodiment provides a heating furnace 1, which can be used as a drying furnace to dry the battery cells and solidify the gate lines; or as a sintering furnace to sinter the battery cells to form ohmic contact between the gate lines and the silicon substrate.

[0049] The heating furnace 1 includes a frame, a conveying mechanism, a plurality of heating furnace bodies 11 , at least one exhaust gas treatment mechanism 3 , and at least one intake air preheating mechanism 2 .

[0050] A plurality of heating furnace bodies 11 are disposed on the frame in a manner adjacent to and connected to each other along a first horizontal direction. The heating furnace bodies 11 provide a high temperature environment for the battery cells to be dried or sintered.

[0051] The waste gas treatment mechanism 3 is connected to at least one of the plurality of heating furnace bodies 11 to collect, treat and discharge the waste gas.

[0052] The conveying mechanism can use a steel mesh belt, a chain rod conveyor belt, a roller conveyor, etc. to convey the battery cells to be processed. The conveying mechanism passes through all the heating furnace bodies 11 and the exhaust gas treatment mechanism 3.

[0053] The air intake preheating mechanism 2 is also arranged on the frame, and the air intake preheating mechanism 2 utilizes the high-temperature exhaust gas in the exhaust gas treatment mechanism 3 to heat the air that is about to enter the furnace.

[0054] Optionally, the plurality of heating furnace bodies 11 each include an upper furnace body and a lower furnace body, and the upper furnace body and the lower furnace body can be separated from each other in the vertical direction or sealed and docked, which is convenient for maintenance, inspection and process processing. When sealed and docked, a transmission channel for accommodating a conveying mechanism can be formed, and the air intake preheating mechanism 2 is connected to the air path of the upper furnace body to inject preheated air downward.

[0055] Continue as Figure 2 As shown, the heating furnace 1 includes two exhaust gas treatment mechanisms 3 and two air intake preheating mechanisms 2, and the air delivery sections 23 of the air intake preheating mechanisms 2 are respectively connected to the multiple heating furnace bodies 11.

[0056] The above description of the present application is sufficiently detailed and has certain particularities. Those skilled in the art should understand that the description in the embodiments is merely exemplary, and all changes made without departing from the true spirit and scope of the present application should fall within the scope of protection of the present application. The scope of protection claimed in the present application is defined by the claims, not by the above description in the embodiments. Moreover, the embodiments mentioned in the present application are not limited to being implemented individually, and some embodiments can also be implemented in combination.

Claims

1. An air intake preheating mechanism, characterized in that: The air intake preheating mechanism is installed on the frame of the heating furnace. The heating furnace includes multiple heating furnace bodies and an exhaust gas treatment mechanism. The exhaust gas treatment mechanism is connected to the heating furnace body. The exhaust gas treatment mechanism includes an exhaust pipe for exhausting high-temperature exhaust gas in the heating furnace body. The air intake preheating mechanism includes an air intake pipe. The air intake pipe includes an air intake section, a preheating section, and a gas transmission section that are connected in sequence. The air intake section is connected to the air source equipment in the workshop. The preheating section is arranged along the inner side or outer side of the exhaust pipe. The gas transmission section is used to communicate with the heating furnace body, so that the normal temperature air provided by the gas source equipment enters the preheating section through the air intake section, and enters the heating furnace body from the gas transmission section after being heated by the preheating section.

2. The air intake preheating mechanism according to claim 1, characterized in that: The preheating section is disposed around the inner side surface of the waste discharge pipe.

3. The air intake preheating mechanism according to claim 2, characterized in that: The side wall of the waste discharge pipe is provided with at least one pair of through holes, the air intake section is connected to the preheating section through one of the through holes, and the preheating section is connected to the air delivery section through the other through hole.

4. The air intake preheating mechanism according to claim 1, characterized in that: An annular groove is circumferentially arranged on the outer side surface of the waste discharge pipe, and the preheating section is installed in the annular groove and extends along the annular groove.

5. The air intake preheating mechanism according to claim 1, characterized in that: The gas transmission section is provided with a temperature sensor, and the temperature sensor is used to detect the temperature of the gas inside the gas transmission section and send the result to the control system in real time.

6. The air intake preheating mechanism according to claim 1, characterized in that: The gas transmission section is a heat-insulating gas pipe.

7. The air intake preheating mechanism according to claim 1, characterized in that: The outer surface of the gas transmission section is provided with thermal insulation cotton.

8. The air intake preheating mechanism according to claim 7, characterized in that: The thermal insulation cotton is ceramic fiber paper with single-sided aluminum foil.

9. The air intake preheating mechanism according to claim 1, characterized in that: The gas inlet section or the gas delivery section is provided with a flow meter for controlling the gas flow rate.

10. A heating furnace, characterized in that: The heating furnace comprises a frame, a conveying mechanism, a plurality of heating furnace bodies arranged adjacent to each other and connected to each other, at least one exhaust gas treatment mechanism, and at least one air intake preheating mechanism as described in any one of claims 1 to 8, wherein: The plurality of heating furnace bodies are arranged on the frame along a first horizontal direction, and the plurality of heating furnace bodies are used for drying or sintering battery cells; The at least one waste gas treatment mechanism is disposed on the frame, the at least one waste gas treatment mechanism is connected to at least one heating furnace body, and the waste gas treatment mechanism is configured to discharge high-temperature waste gas generated in the connected heating furnace body; The conveying mechanism passes through the plurality of heating furnace bodies and the at least one exhaust gas treatment mechanism, and the conveying mechanism is used to convey the battery sheet along a first horizontal direction; The air intake preheating mechanism is arranged on the frame, and is configured to send the high-pressure air provided by the air source device to the exhaust pipe of the exhaust gas treatment mechanism for heating, and send the heated high-pressure air to the connected heating furnace body.

11. The heating furnace according to claim 10, characterized in that A plurality of the air intake preheating mechanisms are installed on the exhaust pipe of each exhaust gas treatment mechanism, and the gas delivery sections of the plurality of air intake preheating mechanisms are respectively connected to a heating furnace body.

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