Low-energy-consumption and small-size sintering furnace

Abstract

The utility model discloses a low-energy-consumption and small-size sintering furnace, which belongs to the field of sintering furnaces and comprises a base, a sintering furnace and a waste heat utilization mechanism. The sintering furnace comprises a drying area, a sintering area, a preheating area and an irradiation area which are linearly spliced to the top of the base, a feeding and discharging area is arranged on the opposite sides of the drying area and the irradiation area, and a furnace top is arranged on the top of the sintering furnace. And the waste heat utilization mechanism comprises a fixing plate and two heat extraction fans, the fixing plate is arranged on the right side of the interior of the furnace top, and the two heat extraction fans are arranged on the right side of the top. According to the low-energy-consumption and small-size sintering furnace, an eleventh temperature zone, a twelfth temperature zone and an air cooling zone of an existing sintering furnace are removed, a battery piece directly enters a preheating zone after passing through ten temperature zones of the sintering zone, energy loss caused by temperature rising and falling in the operation process of the sintering furnace can be effectively reduced, meanwhile, the length of the sintering furnace is shortened, the equipment size is reduced, and the production cost is reduced. And the waste heat utilization mechanism is arranged, so that the energy loss and the production cost can be effectively reduced.

Description

Technical Field

[0001] The utility model relates to the field of sintering furnaces, in particular to a low-energy-consumption, small-sized sintering furnace. Background Art

[0002] TOPCon is a tunneling oxide passivation contact solar cell technology based on the principle of selective carriers. Its cell structure is an N-type silicon substrate cell. An ultra-thin silicon oxide layer is prepared on the back of the cell, and then a thin layer of doped silicon is deposited. The two together form a passivation contact structure, which effectively reduces surface recombination and metal contact recombination, and provides greater room for further improvement of the conversion efficiency of N-PERT cells. Its production process includes texturing, boron diffusion, BSG removal + alkaline polishing, deposition of amorphous silicon, RCA, ALD, front and back coating, and metallization. The metallization process is to print silver paste electrodes on the surface of the cell, and sinter them in a sintering furnace to form a good ohmic contact between the metal electrode and the silicon wafer.

[0003] At present, the sintering furnace is mainly divided into a drying zone, a sintering zone, a preheating zone and an irradiation zone, wherein the drying zone has 6 temperature zones, the sintering zone has 12 temperature zones, the preheating zone has 6 temperature zones, and the irradiation zone has 9 temperature zones. Temperature zones 1-9 in the sintering zone are pre-sintering temperature zones, temperature zone 10 is a sintering temperature zone, and temperature zones 11 and 12 are cooling zones. The temperature in the preheating zone rises to 670°C and then cools down to 500°C. The temperature conversion between the sintering zone and the preheating zone causes a large energy loss, and the equipment is large in size and occupies a large area. Therefore, how to solve the above problems has become an urgent problem to be solved by technical personnel in this field. Utility Model Content

[0004] In order to solve the problem of large energy loss caused by temperature conversion between the sintering zone and the preheating zone, the utility model provides a low-energy consumption, small-sized sintering furnace, and the technical solution is as follows:

[0005] A low-energy consumption, small-sized sintering furnace, including a base, a sintering furnace and a waste heat utilization mechanism;

[0006] The sintering furnace comprises a drying area, a sintering area, a preheating area and an irradiation area which are connected to the top of the base in a straight line, a loading and unloading area is arranged on the opposite side of the drying area and the irradiation area, and a furnace roof is arranged on the top of the sintering furnace;

[0007] The waste heat utilization mechanism includes a fixed plate and a heat extraction blower. The fixed plate is arranged on the right side of the furnace top. There are two heat extraction blowers and both are arranged on the right side of the top. The inlets of the two heat extraction blowers are provided with connecting pipes connected to the fixed plate.

[0008] Preferably, the sintering furnace and the loading and unloading areas are both provided with transmission rollers, the furnace top is internally provided with thermocouples and lamps, and the transmission rollers include a plurality of rotatable rollers, and the plurality of rollers are equidistantly distributed.

[0009] Preferably, the upper and lower material areas are divided into an upper material opening and a lower material opening, the upper material opening is in contact with the drying area, and the lower material opening is in contact with the irradiation area.

[0010] Preferably, the sintering zone is divided into ten temperature zones, wherein the first nine temperature zones are pre-sintering temperature zones, and the tenth temperature zone is a sintering temperature zone, and the temperature of the sintering temperature zone is above 800 degrees.

[0011] Preferably, a support frame is fixedly installed on the right side of the top of the furnace roof, a shunt pipe is provided inside the fixed plate, and fixed pipes extending to the outside of the fixed plate are provided on both left and right sides of the front of the shunt pipe.

[0012] Preferably, the number of the shunt tubes is two and they are staggered and distributed in a front-to-back cross pattern, the number of the fixed tubes is two groups, the two groups of fixed tubes are equidistantly distributed, and the two fixed tubes are respectively connected to the two shunt tubes.

[0013] Preferably, the number of the heat extraction blowers is two and they are symmetrically distributed, and the two heat extraction blowers are connected to the two diversion pipes through two connecting pipes respectively.

[0014] Preferably, heat utilization pipes are fixedly installed on both left and right sides of the top of the support frame, and heat conduction pipes respectively connected to the two heat utilization pipes are fixedly installed at the outlets of the two heat extraction fans.

[0015] Beneficial effects:

[0016] The beneficial effects of the technical solution of the utility model are as follows:

[0017] 1. This low-energy consumption, small-sized sintering furnace removes the eleventh and twelfth temperature zones and the air cooling zone of the existing sintering furnace, so that the battery cells can directly enter the preheating zone after passing through the ten temperature zones of the sintering zone, which can effectively reduce the energy loss caused by the temperature rise and fall during the operation of the sintering furnace, and at the same time shorten the length of the sintering furnace and reduce the size of the equipment.

[0018] 2. This low-energy consumption, small-sized sintering furnace is equipped with a waste heat utilization mechanism. The heat extraction fan can send the waste heat in the irradiation zone into the heat utilization pipe via the connecting pipe, the heat extraction fan and the fixed pipe for heating other devices. The waste heat can also be transported to different locations via two heat utilization pipes at the same time, which can effectively reduce energy loss and production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solution of the implementation mode of the utility model, the drawings required for use in the implementation mode will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0021] Figure 2 It is a top sectional view of a fixing plate of the utility model.

[0022] In the figure, 1. base; 2. drying area; 3. sintering area; 4. preheating area; 5. irradiation area; 6. loading and unloading area; 7. furnace top; 8. transmission roller; 9. thermocouple; 10. lamp tube; 11. fixing plate; 12. support frame; 13. shunt pipe; 14. fixing pipe; 15. heat extraction fan; 16. connecting pipe; 17. heat utilization pipe. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Therefore, the following detailed description of the embodiments of the utility model provided in the drawings is not intended to limit the scope of the utility model for which protection is sought, but merely represents the selected embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0024] like Figure 1-2 As shown, the low energy consumption, small size sintering furnace comprises: a base 1, a sintering furnace and a waste heat utilization mechanism;

[0025] The sintering furnace includes a drying area 2, a sintering area 3, a preheating area 4 and an irradiation area 5 which are linearly spliced ​​on the top of a base 1. Support rods fixedly connected to the top of the base 1 are fixedly installed around the bottom of the drying area 2 and the preheating area 4. A loading and unloading area 6 is arranged on the side opposite to the drying area 2 and the irradiation area 5. A furnace top 7 is arranged on the top of the sintering furnace. A transmission roller 8 is arranged on the sintering furnace and the loading and unloading area 6. The transmission roller 8 includes a plurality of rotatable rollers which are equidistantly distributed. Thermocouples 9 and lamps 10 are respectively arranged inside the furnace top 7.

[0026] Specifically, the sintering zone 3 is divided into ten temperature zones, of which the first nine temperature zones are pre-sintering temperature zones, and the tenth temperature zone is a sintering temperature zone, and the temperature of the sintering temperature zone is above 800 degrees.

[0027] In this embodiment, the eleventh and twelfth temperature zones and the air cooling zone of the existing sintering furnace are removed, so that the battery cells directly enter the preheating zone 4 after passing through the ten temperature zones of the sintering zone 3, which can effectively reduce the energy loss caused by the temperature rise and fall during the operation of the sintering furnace, and at the same time shorten the length of the sintering furnace and reduce the size of the equipment.

[0028] In addition, the loading and unloading area 6 is divided into a loading port and a unloading port. The loading port is in contact with the drying area 2, and the unloading port is in contact with the irradiation area 5, which is convenient for loading and unloading operations.

[0029] like Figure 1-2 As shown, the waste heat utilization mechanism includes a fixed plate 11 arranged on the right side of the furnace roof 7, a support frame 12 is fixedly installed on the right side of the top of the furnace roof 7, a shunt pipe 13 is arranged inside the fixed plate 11, the number of the shunt pipes 13 is two and they are staggered and distributed in a front-to-back cross pattern, the left and right sides of the front of the shunt pipe 13 are provided with fixed pipes 14 extending to the outside of the fixed plate 11, the number of the fixed pipes 14 is two groups, the two groups of fixed pipes 14 are equidistantly distributed, the two fixed pipes 14 are connected with the two shunt pipes 13 respectively, and a heat extraction fan 15 is fixedly installed on the left and right sides of the support frame 12, and the inlet of the heat extraction fan 15 is provided with a connecting pipe 16 connected with the fixed plate 11.

[0030] Specifically, there are two heat extraction fans 15 and they are symmetrically distributed. The two heat extraction fans 15 are connected to the two shunt pipes 13 through two connecting pipes 16 respectively. Heat utilization pipes 17 are fixedly installed on the left and right sides of the top of the support frame 12. The outlets of the two heat extraction fans 15 are fixedly installed with heat conduction pipes respectively connected to the two heat utilization pipes 17.

[0031] In this embodiment, the heat extraction fan 15 can transport the waste heat in the irradiation zone 5 into the heat utilization pipe 17 for heating other devices, such as a drying room, and can simultaneously transport the waste heat to different locations via two heat utilization pipes 17, which can effectively reduce energy loss and production costs.

[0032] In addition, the arrangement of the two shunt pipes 13, the heat extraction fan 15 and the heat utilization pipe 17 can transport the waste heat to different locations respectively, further improving the waste heat utilization efficiency.

[0033] When in use, the battery cell will directly enter the preheating zone 4 after passing through the ten temperature zones of the sintering zone 3, so as to minimize the large energy loss caused by the temperature conversion between the sintering zone 3 and the preheating zone 4, and reduce the energy loss caused by the temperature rise and fall during the operation of the sintering furnace. When the battery cell passes through the irradiation zone 5, one or two heat extraction fans 15 are started as needed. The heat extraction fans 15 will send the waste heat in the irradiation zone 5 into the heat utilization tube 17 through the connecting tube 16, the heat extraction fan 15 and the fixed tube 14 via the heat conduction pipe, so that the preheating can be used for heating other devices, which can effectively reduce energy loss and production costs.

[0034] The above description is only the preferred implementation of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A low energy consumption, small size sintering furnace, characterized in that: include: A base (1), a sintering furnace and a waste heat utilization mechanism; The sintering furnace comprises a drying zone (2), a sintering zone (3), a preheating zone (4) and an irradiation zone (5) which are connected to the top of the base (1) in a straight line, a loading and unloading zone (6) is arranged on the opposite side of the drying zone (2) and the irradiation zone (5), and a furnace top (7) is arranged on the top of the sintering furnace; The waste heat utilization mechanism comprises a fixed plate (11) and a heat extraction blower (15); the fixed plate (11) is arranged on the right side inside the furnace top (7); there are two heat extraction blowers (15) and both are arranged on the right side of the top of the furnace (7); the inlets of the two heat extraction blowers (15) are both provided with a connecting pipe (16) connected to the fixed plate (11).

2. The low energy consumption, small size sintering furnace according to claim 1, characterized in that: The sintering furnace and the loading and unloading area (6) are both provided with a transmission roller (8), the interior of the furnace top (7) is respectively provided with a thermocouple (9) and a lamp tube (10), and the transmission roller (8) includes a plurality of rotatable rollers, and the plurality of rollers are equidistantly distributed.

3. The low energy consumption, small size sintering furnace according to claim 1, characterized in that: The loading and unloading area (6) is divided into a loading opening and a unloading opening, the loading opening is in contact with the drying area (2), and the unloading opening is in contact with the irradiation area (5).

4. The low energy consumption, small size sintering furnace according to claim 1, characterized in that: The sintering zone (3) is divided into ten temperature zones, of which the first nine temperature zones are pre-sintering temperature zones and the tenth temperature zone is a sintering temperature zone. The temperature of the sintering temperature zone is above 800 degrees.

5. The low energy consumption, small size sintering furnace according to claim 1, characterized in that: A support frame (12) is fixedly installed on the right side of the top of the furnace roof (7), a shunt pipe (13) is provided inside the fixed plate (11), and fixed pipes (14) extending to the outside of the fixed plate (11) are provided on both left and right sides of the front of the shunt pipe (13).

6. The low energy consumption, small size sintering furnace according to claim 5, characterized in that: The number of the shunt pipes (13) is two and they are distributed in a front-to-back cross-displacement manner; the number of the fixed pipes (14) is two groups, the two groups of fixed pipes (14) are distributed at equal distances, and the two fixed pipes (14) are respectively connected to the two shunt pipes (13).

7. The low energy consumption, small size sintering furnace according to claim 6, characterized in that: The two heat extraction fans (15) are respectively connected to the two flow diversion pipes (13) via two connecting pipes (16).

8. The low energy consumption, small size sintering furnace according to claim 7, characterized in that: Heat utilization pipes (17) are fixedly installed on both left and right sides of the top of the support frame (12), and heat conduction pipes respectively connected to the two heat utilization pipes (17) are fixedly installed at the outlets of the two heat extraction fans (15).

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