High-purity quartz sand screening device applied to photovoltaic power generation system

Abstract

The utility model discloses a high-purity quartz sand screening device applied to a photovoltaic power generation system. The high-purity quartz sand screening device comprises a feeding bin cover, a vibrating screen and a discharging bin which are sequentially arranged from top to bottom. A feeding opening is formed in the feeding bin cover; a feeding hole I is formed in the top of the vibrating screen; a coarse material discharging hole and a fine material discharging hole are formed in the side wall of the vibrating screen; a feed port II is formed in the top of the discharge bin, a discharge port is formed in the bottom of the discharge bin, and a fine material discharge port of the vibrating screen is connected with the feed port II of the discharge bin; the hot air supply pipes are fixed on the inner wall of the bottom of the discharging bin, and a plurality of air holes are formed in the hot air supply pipes; the exhaust unit comprises an upper exhaust pipe and a lower exhaust pipe; the vibrating screen of the screening device can achieve particle size grading of quartz sand, the hot gas supply pipe in the discharging bin sprays high-temperature gas such as argon, metal impurities such as Fe, Al and hydroxyl-OH adsorbed on the surface of the quartz sand in the falling process of the quartz sand are removed, the purity of the quartz sand is remarkably improved, and the photovoltaic high-purity quartz sand screening device meets the strict requirements of photovoltaic high-purity quartz sand.

Description

Technical Field

[0001] This utility model relates to the field of quartz sand treatment technology, specifically a high-purity quartz sand screening device applied to photovoltaic power generation systems. Background Technology

[0002] Photovoltaic power generation systems have extremely high requirements for the purity, particle size distribution, and surface cleanliness of high-purity quartz sand, which is mainly used in the manufacture of photovoltaic crucibles, photovoltaic glass, and silicon wafer cutting.

[0003] Traditional quartz sand screening devices typically employ vibrating screens or airflow separation, but these methods have the following drawbacks:

[0004] (1) Incomplete removal of impurities: Conventional vibrating screens can only classify by particle size and cannot effectively remove metal impurities (such as Fe and Al) and hydroxyl (-OH) contamination adsorbed on the surface of quartz sand, which affects the stability of photovoltaic melting process.

[0005] (2) Separation of thermal purification and screening: Existing equipment requires screening first and then separate high-temperature purification treatment, which is complicated and energy-intensive, and is prone to secondary pollution.

[0006] To address the aforementioned issues, we have upgraded the existing equipment to meet usage requirements. Utility Model Content

[0007] The technical problem to be solved by this utility model is to address the shortcomings of the existing technology by providing a high-purity quartz sand screening device that can screen quartz sand and further remove impurities from the screened quartz sand through thermal purification, which can be applied to photovoltaic power generation systems.

[0008] The technical problem to be solved by this utility model is achieved through the following technical solution: a high-purity quartz sand screening device for photovoltaic power generation system, comprising a feed hopper cover, a vibrating screen and a discharge hopper arranged from top to bottom.

[0009] The feed hopper cover has a feeding port; the top of the vibrating screen has a feed inlet I, and the feed hopper cover covers the outer edge of the feed inlet of the vibrating screen. The side wall of the vibrating screen has a coarse material outlet and a fine material outlet; the top of the discharge hopper has a feed inlet II, and the bottom of the discharge hopper has a discharge outlet. The fine material outlet of the vibrating screen is connected to the feed inlet II of the discharge hopper.

[0010] It also includes several hot air supply pipes, which are fixed on the bottom inner wall of the discharge hopper and have several air holes. An air supply connector is fixed on the bottom outer wall of the discharge hopper, and the air outlet of the air supply connector is connected to the hot air supply pipe inside the discharge hopper.

[0011] It also includes an exhaust unit, which includes an upper exhaust pipe and a lower exhaust pipe. The air inlet end of the upper exhaust pipe is fixed on the top surface of the feed hopper cover and is connected to the feed inlet I of the vibrating screen. The air inlet end of the lower exhaust pipe is fixed on the top outer wall of the discharge hopper and extends into the discharge hopper.

[0012] The technical problem to be solved by this utility model can also be achieved through the following technical solution: the high-purity quartz sand screening device applied to the photovoltaic power generation system described above has several inclined guide plates fixedly arranged on the inner wall of the discharge bin from top to bottom and from left to right in an alternating manner. The inclined guide plates are located between the hot gas supply pipe and the upper exhaust pipe.

[0013] The technical problem to be solved by this utility model can also be achieved through the following technical solution: the high-purity quartz sand screening device applied to the photovoltaic power generation system described above has through holes for the flow of quartz sand and hot air on two inclined guide plates near the bottom wall of the discharge bin.

[0014] The technical problem to be solved by this utility model can also be achieved through the following technical solution: the high-purity quartz sand screening device applied to photovoltaic power generation system described above, wherein the angle between the inclined guide plate and the horizontal plane is an acute angle.

[0015] The technical problem to be solved by this utility model can also be achieved through the following technical solution: the high-purity quartz sand screening device applied to the photovoltaic power generation system described above, wherein the fine material outlet of the vibrating screen and the inlet II of the discharge bin are connected by a fluororubber corrugated pipe.

[0016] The technical problem to be solved by this utility model can also be achieved through the following technical solution: the high-purity quartz sand screening device applied to photovoltaic power generation system described above has a bottom surface of the discharge bin that is inclined and has an acute angle with the horizontal plane.

[0017] Compared with the prior art, the beneficial technical effects of this utility model are:

[0018] (1) The vibrating screen of the screening device can achieve particle size classification of quartz sand, while the hot gas supply pipe in the discharge bin sprays high-temperature gas such as argon to remove the metal impurities such as Fe, Al and hydroxyl-OH adsorbed on the surface during the falling process of quartz sand, which significantly improves the purity of quartz sand and meets the stringent requirements of photovoltaic-grade high-purity quartz sand. Compared with the traditional process that requires screening first and then separate high-temperature treatment, this device can complete the process in one step, reducing energy consumption by more than 30% and improving production efficiency.

[0019] (2) The staggered arrangement of the inclined guide plates can prolong the residence time of the quartz sand in the discharge bin, so that the hot airflow can fully contact the particle surface and ensure that impurities are vaporized and fall off. In addition, the inclined guide plates near the bottom of the discharge bin have through holes to avoid airflow short circuit and enhance heat exchange efficiency.

[0020] (3) The vibrating screen and the discharge bin are connected by a high-temperature resistant fluororubber corrugated pipe, which reduces vibration transmission and prevents fine particles from getting stuck. The bottom of the discharge bin is designed with an acute angle, which, together with the blowing effect of hot air, ensures that the quartz sand is discharged smoothly and avoids accumulation and blockage.

[0021] (4) The upper and lower exhaust pipes of the exhaust unit can recover hot or waste gas in all directions, so as to avoid unnecessary pollution to the factory environment to the greatest extent. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the main structure of this utility model;

[0023] Figure 2 This is a schematic diagram of the structure of the feed hopper cover, vibrating screen, and upper part of the discharge hopper of this utility model.

[0024] In the diagram: 1. Feed hopper cover; 2. Vibrating screen; 3. Discharge hopper; 4. Feed inlet I; 5. Coarse material outlet; 6. Fine material outlet; 7. Feed inlet II; 8. Outlet; 9. Hot air supply pipe; 10. Air supply connector; 11. Upper exhaust pipe; 12. Lower exhaust pipe; 13. Inclined guide plate; 14. Through hole. Detailed Implementation

[0025] The specific technical solutions of this utility model are further described below with reference to the accompanying drawings, so as to enable those skilled in the art to further understand this utility model, without constituting a limitation on its rights.

[0026] Example 1, referring to Figure 1-2 A high-purity quartz sand screening device for photovoltaic power generation system includes a feed hopper cover 1, a vibrating screen 2 and a discharge hopper 3 arranged from top to bottom.

[0027] The feed hopper cover 1 has a feeding port and is roughly circular in shape. The top of the vibrating screen 2 has a feed inlet I4, which can be a circular opening. The feed hopper cover 1 covers the outer edge of the feed inlet of the vibrating screen 2. The connection method can be threaded connection or socket connection. The side wall of the vibrating screen 2 has a coarse material outlet 5 and a fine material outlet 6. The top of the discharge hopper 3 has a feed inlet II7, which is roughly circular in shape. The bottom of the discharge hopper 3 has an outlet 8. The fine material outlet 6 of the vibrating screen 2 is connected to the feed inlet II7 of the discharge hopper 3. This connection can be made by a flexible connection through a fluororubber corrugated pipe, which reduces vibration transmission and prevents fine particles from getting stuck. The bottom of the discharge hopper 3 is designed with an acute angle, which, together with the blowing effect of hot air, ensures that the quartz sand is discharged smoothly and avoids accumulation and blockage.

[0028] It also includes several hot gas supply pipes 9, the number of which can be selected according to the usage requirements. They are fixed on the bottom inner wall of the discharge bin 3 and have several air holes. A gas supply connector 10 is fixed on the bottom outer wall of the discharge bin 3. The gas supply connector 10 is existing technology and can be selected according to the usage requirements. The gas outlet end of the gas supply connector 10 is connected to the hot gas supply pipe 9 in the discharge bin 3. Hot gas, such as argon or nitrogen at 400~600℃, can be introduced into the hot gas supply pipe 9. It should be noted that the feed bin cover 1, the vibrating screen 2 and the discharge bin 3 should all be made of high temperature resistant materials.

[0029] It also includes an exhaust unit, which includes an upper exhaust pipe 11 and a lower exhaust pipe 12. The air inlet end of the upper exhaust pipe 11 is fixed on the top surface of the feed hopper cover 1 and is connected to the feed inlet I4 of the vibrating screen 2. The air inlet end of the lower exhaust pipe 12 is fixed on the top outer wall of the discharge hopper 3 and extends into the discharge hopper 3. The air outlet ends of the upper exhaust pipe 11 and the lower exhaust pipe 12 can be connected to the waste gas recovery pipe in the plant for centralized discharge through pipelines. The bottom surface of the discharge hopper 3 is inclined and the angle between it and the horizontal plane is an acute angle. The angle can be selected according to the usage requirements, for example, 40°.

[0030] Several inclined guide plates 13 are fixedly installed on the inner wall of the discharge bin 3 in a staggered manner from top to bottom and left to right. The number of plates used can be selected according to the usage requirements, for example, 3 plates. The inclined guide plates 13 are formed into a roughly square plate structure. The inclined guide plates 13 are located between the hot air supply pipe 9 and the upper exhaust pipe 11. The two inclined guide plates 13 near the bottom wall of the discharge bin 3 are provided with through holes 14 for the flow of quartz sand and hot air. The angle between the inclined guide plates 13 and the horizontal plane is an acute angle. The specific angle value can be selected according to the usage requirements, for example, 45°.

[0031] The staggered arrangement of the inclined guide plates 13 can extend the residence time of the quartz sand in the discharge bin 3, allowing the hot airflow to fully contact the particle surface and ensuring that impurities are vaporized and detached.

[0032] The operating principle of the high-purity quartz sand screening device applied to a photovoltaic power generation system in Example 1 is as follows:

[0033] (1) Equipment preparation stage: Check the connection status of each component to ensure that the connection between the feed hopper cover 1 and the vibrating screen 2, and between the vibrating screen 2 and the discharge hopper 3 is well sealed. Sealing rings can be pre-installed at each connection. Confirm that the gas supply connector 10 and the hot gas supply pipe 9 of the hot gas supply system are connected to an external gas source that can supply hot inert gas. The gas source temperature is maintained within the range of 400~600℃.

[0034] (2) System start-up phase: Turn on the exhaust unit and connect the negative pressure pipeline in the plant area to the exhaust end of the upper exhaust pipe 11 and the lower exhaust pipe 12, so that a negative pressure environment is formed inside the discharge bin 3 and the vibrating screen 2. At this time, hot gas is supplied to the hot gas supply pipe 9 and the gas flow rate is adjusted to a flow rate range of 5-10 m / s.

[0035] (3) Material processing stage: The high-purity quartz sand to be processed is fed into the feed hopper 1 through the feed port of the feed hopper 1. The quartz sand first enters the feed port I4 of the vibrating screen 2. Then the quartz sand is classified according to particle size in the vibrating screen 2. Coarse particles (> target particle size) are discharged and collected through the coarse material outlet 85 on the side wall, and fine particles (meeting the particle size requirements) enter the discharge hopper 3 through the fine material outlet 6.

[0036] (4) Processing of discharge bin 3: Fine-grained quartz sand enters the feed inlet II7 of discharge bin 3 through a fluororubber corrugated pipe. When the quartz sand falls, it passes through three inclined guide plates 13 in sequence. When it passes through the two inclined guide plates 13 with through holes 14 at the bottom, it flows upward through the through holes 14 of the inclined guide plates 13 and forms a countercurrent contact with the falling quartz sand, thereby removing the metal impurities (Fe, Al, etc.) and hydroxyl groups (-OH) adsorbed on the surface.

[0037] (5) Purified quartz sand: slides along the bottom of the discharge bin 3 inclined at 40° to the discharge port 8, and is smoothly discharged under the auxiliary blowing action of hot airflow to avoid accumulation.

Claims

1. A high-purity quartz sand screening device for use in photovoltaic power generation systems, characterized in that: It includes, from top to bottom, a feed hopper cover, a vibrating screen, and a discharge hopper; The feed hopper cover has a feeding port; the top of the vibrating screen has a feed inlet I, and the feed hopper cover covers the outer edge of the feed inlet of the vibrating screen. The side wall of the vibrating screen has a coarse material outlet and a fine material outlet; the top of the discharge hopper has a feed inlet II, and the bottom of the discharge hopper has a discharge outlet. The fine material outlet of the vibrating screen is connected to the feed inlet II of the discharge hopper. It also includes several hot air supply pipes, which are fixed on the bottom inner wall of the discharge hopper and have several air holes. An air supply connector is fixed on the bottom outer wall of the discharge hopper, and the air outlet of the air supply connector is connected to the hot air supply pipe inside the discharge hopper. It also includes an exhaust unit, which includes an upper exhaust pipe and a lower exhaust pipe. The air inlet end of the upper exhaust pipe is fixed on the top surface of the feed hopper cover and is connected to the feed inlet I of the vibrating screen. The air inlet end of the lower exhaust pipe is fixed on the top outer wall of the discharge hopper and extends into the discharge hopper.

2. The high-purity quartz sand screening device for photovoltaic power generation systems according to claim 1, characterized in that: Several inclined guide plates are fixedly installed on the inner wall of the discharge hopper in a staggered manner from top to bottom and left to right. The inclined guide plates are located between the hot air supply pipe and the upper exhaust pipe.

3. The high-purity quartz sand screening device for photovoltaic power generation systems according to claim 2, characterized in that: Two inclined guide plates near the bottom wall of the discharge hopper have through holes for the flow of quartz sand and hot air.

4. The high-purity quartz sand screening device for photovoltaic power generation systems according to claim 2, characterized in that: The angle between the inclined guide plate and the horizontal plane is an acute angle.

5. The high-purity quartz sand screening device for photovoltaic power generation systems according to claim 1, characterized in that: The fine material outlet of the vibrating screen is connected to the inlet II of the discharge bin via a fluororubber corrugated pipe.

6. The high-purity quartz sand screening device for photovoltaic power generation systems according to claim 1, characterized in that: The bottom surface of the discharge hopper is inclined, and the angle between it and the horizontal plane is acute.

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