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Problems solved by technology
[0004] 1. The mechanical collision between crushing tools and polysilicon will inevitably produce metal pollution, especially iron pollution will seriously reduce the minority carrier life of polysilicon
[0005] 2. In the process of mechanical crushing, a large amount of debris and fine powder will inevitably be produced, which will reduce the acceptance rate and seriously affect the quality of polysilicon and the profit of the enterprise
[0006] 3. Debris and fine powder will pollute the environment and endanger the health of employees. The finer dust is flammable and explosive in the air, which will pose a great safety hazard
Method used
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Embodiment 1
[0038] Such as figure 1 As shown, a device for crushing polysilicon, the device includes a high-voltage transformer B, a charging group R, a high-voltage rectifier G, a charging capacitor C, an isolation interval switch K, a pool F, and a first electrode 1 immersed in the pool F and the second electrode 2, wherein:
[0039] The primary winding of the high-voltage transformer B is connected to the mains, the first connection end of the secondary winding is connected to the charging group R, the high-voltage rectifier G, the isolation interval switch K and the first electrode 1 in sequence, and the second connection of the secondary winding is connected to terminal is grounded and connected to the second electrode 2, and the charging capacitor C is connected between the common end of the high-voltage rectifier G and the isolation interval switch K and the common end of the second winding and the second electrode 2.
[0040] The resistivity of the water in pool F ≥ 18.2 MΩ.cm, S...
Embodiment 2
[0042] A method for crushing polysilicon, adopting the device of embodiment 1, the method steps are as follows:
[0043] Step 1. First inject 1 / 2-3 / 4 volume of water into the pool, then put polysilicon into the water, and the water will submerge all the polysilicon;
[0044] Step 2, apply instantaneous high voltage to the pool, the electric field intensity generated by the high voltage is greater than or equal to the critical electric field intensity of the pool, the specific operations are as follows:
[0045] a. Use commercial power to charge the charging capacitor through a high-voltage transformer;
[0046] b. When the voltage of the charging capacitor reaches the breakdown voltage of the isolation interval switch, the isolation interval switch is broken down, and at this time, all the energy stored in the charging capacitor is added to the pool;
[0047] c. Repeat the above steps until all the polysilicon is crushed and stop.
[0048] Among them, the breakdown voltage o...
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Abstract
The invention discloses a method for breaking polysilicon, which comprises the following steps of: 1) putting the polysilicon into a pool by taking the case that the polysilicon is just sunk in the water as the reference; and 2) applying instant high-voltage electricity to the pool, wherein the electric field intensity generated by the high-voltage electricity is more than or equal to the critical electric field intensity of the pool. With the method for breaking the polysilicon, which is provided by the invention, the traditional polysilicon breaking thought is broken through, the polysilicon is broken by the hydroelectric effect, the large-scale breaking production can be realized, and the technology is simple. The device for breaking the polysilicon, which is provided by the invention, has the advantages of simple and safe structure and easiness in operation. According to the invention, the metal pollution problem in the prior art is avoided, breaking is even, the formation of polysilicon powder is effectively reduced, and the method and the device for breaking polysilicon provided by the invention have a very important meaning for improving the enterprise benefit.
Description
technical field [0001] The invention relates to a method and equipment for crushing light polysilicon, belonging to the field of polysilicon crushing. Background technique [0002] With the gradual depletion of fossil energy and the aggravation of environmental pollution, it is imperative to explore a pollution-free renewable energy. Making full use of solar energy is of great economic and strategic significance to achieve sustainable development under a low-carbon model. Polysilicon is the main raw material for the production of solar photovoltaic cells. The crushing of polysilicon is the last production link of polysilicon production enterprises, and its completion is directly related to the quality of polysilicon and enterprise benefits. [0003] Polysilicon enterprises crush polysilicon almost all by mechanical crushing, and there are two methods of mechanical crushing: manual crushing and automatic crushing. Manual crushing is the method of using a hammer (or other h...
Claims
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