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Full recovery process and control method of converter steelmaking gas based on nitrogen compensation

A technology of converter steelmaking and full recovery, which is applied in metal processing, waste gas treatment, manufacturing converters, etc., and can solve unseen problems

Active Publication Date: 2020-01-07
BEIJING KDHY SCI & TECH DEV LTD
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Problems solved by technology

[0007] The converter steelmaking gas recovery process and its control method based on nitrogen compensation have not seen any published publications, documents or materials

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  • Full recovery process and control method of converter steelmaking gas based on nitrogen compensation
  • Full recovery process and control method of converter steelmaking gas based on nitrogen compensation

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Embodiment Construction

[0012] Regarding the analysis of the current coal gas recovery situation, the general recovery conditions currently used are CO content ≥ 35% and oxygen content ≤ 2%. The process associated with gas recovery is usually divided into three stages in the converter smelting process, called the pre-combustion period. , Gas payback period and post-burn period. Taking a 120-ton converter as an example, the converter smelting cycle is about 35-40 minutes, of which the oxygen blowing smelting time is about 15 minutes, divided into the pre-burning period about 3 minutes, the gas recovery time about 10 minutes, and the post-burning period about 2 minutes; non-smelting time About 20-25min. In other words, the current gas recovery time is about 10 minutes, and the gas is not recovered at the time of about 3 minutes in the pre-burning period and about 2 minutes in the post-burning period, but is ignited and released through the chimney. The reason why the gas in the pre-burning period is no...

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Abstract

A nitrogen-compensation-based converter steelmaking gas full-recycle process and a control method thereof belong to converter steelmaking gas recycle techniques. The invention is intended to researchand develop a process adaptive to the conditions of converter steelmaking gas recycle and a control method thereof according to the characteristics of converter steelmaking gas recycle, in order to achieve full recycle of converter gas. The process is characterized in that for flue gas having out-of-limit oxygen content for an early burning flue gas mixing point, a late burning flue gas mixing point and an intermediate burning mixing point at abnormal time, nitrogen is supplemented to perform diluting so that the oxygen content is set to the range of < / =2%, the oxygen content meets the oxygencontent standard allowing good safety and recycling, full recycle of converter gas is achieved, zero emission of flue gas from one-off dedusting of converter steelmaking, gas recycle index can be increased, energy can be greatly saved for a dedusting fan, zero mission of pollutants is achieved especially, and the process is widely applicable to various newly-built, expanded or reformed OG-processconverter steelmaking gas recycle systems.

Description

Technical field [0001] The invention belongs to the OG method converter steelmaking gas recovery technology. Background technique [0002] Converter gas is an important secondary energy source for iron and steel enterprises. The recovery of converter gas accounts for about 70% to 90% of the total energy recovery of the entire converter process. It is a key link in "negative steelmaking" and reducing process energy consumption. The converter gas has a higher calorific value and is a relatively high-quality fuel. It can play an important role in the fuel balance of iron and steel enterprises. Increasing the recovery of converter gas can not only effectively reduce the production cost of the steelmaking process, but also greatly reduce the steelmaking process. The total amount of pollutants discharged from the plant to achieve clean production. [0003] At present, converter flue gas dust removal and gas recovery systems are roughly divided into three types: wet (OG method Oxygen Con...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/40
CPCC21C5/40C21C2100/02
Inventor 高毅夫
Owner BEIJING KDHY SCI & TECH DEV LTD
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