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在户第３号烧结机中运行了１７年的电除尘器明显老化，除尘性能降低，必须更新电除尘器。于是，考虑到将来控制环境污染和促进节能，于１９９２年１０月应用了能够大幅度减少需处理排气量、并且能够降低烧结烧成能耗的主排气循环技术。结果，对烧结的生产率和质量都没有大的影响，使２５％的烧结料层废气循环，成功地将气体从烟囱排出，减少了循环当量。由于这种排气量的减少，不需要循环当量的除尘能力，可以停用１台电除尘器。
Electric household dust collector No. 3 sintering machine running for 17 years significantly aging, dust removal performance, we must update the ESP. As a result, in October 1992, a main exhaust gas recirculation technology capable of drastically reducing the amount of exhaust gas to be treated and reducing the energy consumption of the sintering firing was taken into consideration in future control of environmental pollution and promotion of energy saving. As a result, there is no major impact on the productivity and quality of the sinter, recycling 25% of the sinter bed exhaust gas, successfully venting the gas from the stack, and reducing cycle equivalents. Due to the reduction of this displacement, there is no need for dust removal capacity of the circulating equivalent, and one electrostatic precipitator can be deactivated.