Method for improving coal gas recovery of semi-steel steel-making dry dedusting system

Abstract

The invention provides a method for improving coal gas recovery of a semi-steel steel-making dry dedusting system. The method includes the following steps: monitoring the volume concentration of carbon monoxide and oxygen in dedusted smoke; collecting the dedusted smoke under the conditions that the volume concentration of carbon monoxide is not less than 33% and the volume concentration of oxygen is not more than 1%; lowering a movable smoke hood of a converter after the converter starts converting for 20-60s so as to keep the space between the movable smoke hood of the converter and the mouth of the converter within 200-350mm, and controlling the micro differential pressure at the mouth of the converter within 5-10mbar; and moreover, controlling the rotational speed of a fan of the dry dedusting system within 1300-1400rpm during loading period of the converter, controlling the rotational speed of the fan within 1000-1150rpm during the converting process, and controlling the rotational speed of the fan within 1000-1100rpm during the tapping and splashing process. The method provided by the invention can improve the coal gas recovery of the semi-steel steel-making dry dedusting system, and as a result, the energy utilization ratio as well as the negative energy steel-making level can be improved.

Description

technical field [0001] The invention relates to the technical field of dry dust removal for vanadium extraction converters, and more specifically, relates to a method capable of increasing the gas recovery of a semi-steelmaking dry dust removal system. Background technique [0002] The existing converter gas purification and recovery system in my country mostly adopts the traditional wet dedusting technology (OG method), the automation control level and gas recovery are low, and the dust content of the purified gas still reaches 100mg / m 3 , The recovery system consumes a lot of energy, and the energy consumption per ton of steel in the converter steelmaking process is 23.6kg of standard coal. In the early 1960s, the dry dedusting method of the converter developed jointly by the German Lurgi Company and the German Thyssen Steel Works, referred to as the LT method, began to be popularized and applied in the early 1980s; the basic principle of the converter dry dedusting techno...

AI Technical Summary

Problems solved by technology

However, these patent application publications all mainly focus on the use method of dry dust removal system or how to prevent gas explosion venting (CO, H 2 ), there is no disclosure on how to increase the gas recovery of semi-steelmaking dry dust removal system