Abstract:

Austrian P&P wet spent sulfuric acid regeneration process has been introduced in China. The high temperature flue gas filter element is generally broken, blocked and deformed after being put into operation. The causes of the problems are analyzed in detail from purge temperature, air source pressure, replacement time, fuel gas composition, and the vertical degree of the filter element installation, and the optimization and improvement scheme is put forward. During purging of high temperature flue gas filter, the highest temperature heated by the electric tracing is generally 420～480 ℃, which is not up to the optimal purging temperature(above 500 ℃) required by the process package. This is the main reason for the problem. By adding an electric heater on the main replacement air pipe, the problem of insufficient purging temperature can be effectively solved, and the overall purging time can be shortened. At the same time, it will save more than 3 million yuan of maintenance cost each year. This scheme has been highly recognized by P&P company.

Key words: high temperature flue gas filter, purge process, gas source pressure, replacement time, fuel gas, filter element verticality, electric heater

摘要：

国内引进的奥地利P&P湿法废酸再生工艺投产后普遍存在高温烟气过滤器滤芯断裂、堵塞、变形等问题，从吹扫温度、气源压力、置换时间、燃料气组成、滤芯安装垂直度等方面对问题产生的原因进行了详细分析，提出了优化改进方案。高温烟气过滤器吹扫时，电伴热可以加热到的最高温度普遍在420～480℃,达不到工艺包要求的最佳吹扫温度(500℃以上),这是问题产生的主要原因。采用在置换空气总管上增设电加热器的方案，不仅有效解决了吹扫温度不足的问题，而且缩短了整体吹扫时间，同时每年可以节省检修和维护费用300万元以上，该方案得到了P&P公司的高度认可。

关键词: 高温烟气过滤器, 吹扫流程, 气源压力, 置换时间, 燃料气, 滤芯垂直度, 电加热器