In the application process of oxygen-rich bottom blowing matte gold capture self-heating smelting technology, when the oxygen content in the flue gas is high, it will lead to the increase of sulfur trioxide content in the flue gas, and at the same time lead to the increase of the ** temperature of the acid gas in the flue gas. The precipitation of dilute acid is generated at the air leakage of the system, which causes the corrosion of the arsenic collector and the pipeline, reduces the service life of the equipment, and also affects the ash production of the system, increases the production cost, and in serious cases, will lead to the normal operation of the arsenic collection system.
After checking and analyzing the influence of oxygen content at the outlet of the electrostatic precipitator on the operation of the arsenic collector, it is found that in the operation of the arsenic bag filter, the oxygen content at the outlet of the electrostatic precipitator is controlled at 5%-8%, and the operation cycle and process indicators of the arsenic bag filter will be well controlled.
In August 2020, the oxygen content of the outlet of the smelting electrostatic precipitator of a metallurgical enterprise was monitored by an oxygen content analyzer to increase from 5% to more than 8%, and the smelting white smoke and dust turned green, and then the oxygen content of the outlet of the electrostatic precipitator continued to rise, the arsenic collector produced ash and turned green, the quality of the arsenic collector product could not meet the standard, and the resistance of the arsenic collector was **1000pa, and the system was forced to shut down.
There are three reasons for the increased resistance of the arsenic collector:
1. The oxygen content at the outlet of the smelting electrostatic precipitator increases, which leads to the change of ash production properties of the arsenic collection system, forming glass arsenic to block the arsenic collector, resulting in an increase in the resistance of the arsenic collector.
2. The boiler has a large air leakage and the oxygen content at the inlet of the electric field is too high, resulting in a decrease in the dust collection efficiency of the electrostatic precipitator, and white smoke and dust entering the arsenic collection system, resulting in an increase in the resistance of the arsenic collector.
3. The arsenic collector does not clean the ash in time, which causes blockage and leads to system blockage.
Therefore, in order to solve the above problems, the company observes the monitoring value of the oxygen content analyzer when the arsenic collection system is running, and controls the oxygen content at the outlet of the smelting electrostatic precipitator below 8%. By adjusting the oxygen ratio of the smelting furnace and the amount of secondary air at the intersection of the smelting furnace in time, and adjusting the oxygen content at the outlet of the electrostatic precipitator and the soot Arthur, the melting system can operate stably for a long time.