A method for turning on and off the high-temperature exhaust fan of smelting flue gas without stopping production

Abstract

The invention discloses a method for turning on and off the high-temperature exhaust fan of smelting flue gas without stopping production, comprising the following steps: 1) confirming that the vibration value of the main exhaust fan of the smelting furnace is too large; 2) determining that the main exhaust fan of the smelting furnace is switched to 3) Reduce the amount of smelting furnace material to 60-80% of the normal production amount; 4) Reduce the speed of 1# refining furnace exhaust fan and 2# refining furnace exhaust fan, and at the same time adjust the main SO2 of the acid making system 5) Fully open the outlet valve of the backup fan and the inlet valve of the backup fan, start the backup fan of the smelting furnace, stop the main fan of the smelting furnace, and close the outlet valve of the main fan and the main fan. Fan inlet valve. The invention can guarantee the formation of a negative pressure environment inside the system when the fan is cleaned and switched, effectively avoiding the escape of flue gas, and meeting the environmental protection requirements of the micro-negative pressure production of the smelting furnace. consumption purpose.

Description

technical field [0001] The invention relates to the technical field of acid production from smelting flue gas, and in particular relates to a method for a high-temperature exhaust fan of smelting flue gas to be turned off without stopping. Background technique [0002] Copper smelting uses smelting flue gas to make acid. The smelting flue gas is composed of smelting furnace and refining furnace flue gas and is dedusted by electric dust collector. The high temperature exhaust fan sends the flue gas to the acid making system. The moisture content is high about 10%, and the smoke and dust are relatively humid. The smoke and dust are easily attached to the impeller and volute of the high-temperature exhaust fan, which affects the normal operation of the equipment. It is necessary to stop the high-temperature exhaust fan for cleaning. The average cleaning cycle is once every 2 months. . [0003] In view of the above reasons, it is necessary to set up a backup fan. When the fan n...

AI Technical Summary

Problems solved by technology

[0003] In view of the above reasons, it is necessary to set up a spare fan. When the fan needs to be cleaned, it is necessary to stop the production of the smelting furnace and the refining furnace, stop the fan and switch to the standby fan pipeline, switch to the standby fan to work and discharge the flue gas, and then clean the main fan. Cleaning, the duration of the whole operation process is about 1h, which affects the production rate

And it involves the temperature rise of the converter catalyst in the smelting furnace and the acid system, and the idling of the equipment reduces the utilization rate of the equipment, which is ultimately not conducive to the control of production costs

At the same time, during the switching process of the main and standby fans, the flue gas in the melting furnace cannot be removed immediately, resulting in problems such as environmental pollution caused by flue gas escaping, and violation of environmental protection production.

Images