Recovery of waste crystalline silicon photovoltaic panels based on DMPU coupled pyrolysis

doi:10.16085/j.issn.1000-6613.2023-1700

Abstract

Abstract:

With the rapid development of the photovoltaic industry, China will usher in a peak period of photovoltaic module retirement, and the recovery market for waste crystalline silicon photovoltaic modules has broad prospects. Among them, recovery of complete silicon cells not only has environmental significance, but also has economic benefits. There are many problems with existing recycling methods such as pyrolysis, mechanical disassembly, and chemical dissolution. This article investigated the pre-treatment of N,N-dimethylpropenylurea (DMPU) coupled with pyrolysis for recovery of waste crystalline silicon photovoltaic panels. By exploring the effects of different DMPU pre-treatment conditions on the integrity rate, backplate removal rate, and different pyrolysis conditions on the integrity rate of silicon cells through experiments, it was found that the experimental conditions for achieving the highest integrity rate of silicon cells were first treated with DMPU at 200℃ for 60min, followed by pyrolysis at 480℃ for 60min. The optimal experimental condition for removing the back panel was to treat the photovoltaic panel in DMPU at 200℃ for 30min. Finally, the energy consumption and carbon emissions analysis of the practical application of DMPU coupled pyrolysis for recovery of waste crystalline silicon photovoltaic panels showed that the method used in this article had significant energy-saving and emission reduction benefits.

Key words: photovoltaic panels recovery, N,N-dimethylpropenylurea (DMPU), pyrolysis, silicon cell, recycling

摘要：

随着光伏行业快速发展，我国将迎来光伏组件退役高峰期，废旧晶硅光伏组件回收市场前景广阔。其中，回收完整硅电池片不仅具有环保意义，同时具有经济效益。现有回收方法如热解、机械拆解、化学溶解法等存在诸多问题。本文对N,N-二甲基丙烯基脲（DMPU）预处理耦合热解回收废旧晶硅光伏板进行研究。通过实验探究不同DMPU预处理条件对硅电池片完整率、背板去除率以及不同热解条件对硅电池片完整率的影响，得出使硅电池片完整率最高的实验条件为先在200℃下进行60min DMPU处理后再于480℃下热解60min；去除背板的最佳实验条件为将光伏板置于200℃的DMPU中处理30min。最后，对DMPU耦合热解回收废旧晶硅光伏板的实际应用进行的能耗与碳排分析表明本文使用的方法具有显著的节能减排效益。

关键词: 光伏板回收, N,N-二甲基丙烯基脲, 热解, 硅电池片, 循环利用

CLC Number:

LI Chenyang, GUO Feihong, WANG Yun, JIANG Xiaoxiang, ZHANG Houhu. Recovery of waste crystalline silicon photovoltaic panels based on DMPU coupled pyrolysis[J]. Chemical Industry and Engineering Progress, 2024, 43(10): 5969-5975.

李晨阳, 郭飞宏, 王昀, 姜小祥, 张后虎. DMPU耦合热解回收废旧晶硅光伏板[J]. 化工进展, 2024, 43(10): 5969-5975.

Figures/Tables 11

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在标准测试条件下的性能STC	数值
最大功率P_max/W	10
最大功率电流I_mp/A	0.55
最大功率电压V_mp/V	21.5
开路电压V_oc/V	21.5
短路电流I_sc/A	0.62

在标准测试条件下的性能STC	数值
最大功率P_max/W	10
最大功率电流I_mp/A	0.55
最大功率电压V_mp/V	21.5
开路电压V_oc/V	21.5
短路电流I_sc/A	0.62

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