Rich oxygen supply process for dry-method cement rotary-kiln production

Abstract

The invention relates to the technical field of a dry-method cement production process and provides a rich oxygen supply process adapted to a dry-method cement rotary-kiln production procedure. The rich oxygen supply process comprises the steps that an oxygen-enriched gas obtained after performing VPSA (Vacuum Pressure Swing Adsorption) treatment on air is sucked by a rotary kiln as well as a coal wind fan and a net wind fan of a decomposition furnace, is used as oxygen-enriched coal wind and oxygen-enriched net wind and is transferred to the rotary kiln and each multi-duct powdered coal burner of the decomposition furnace. According to the rich oxygen supply process for dry-method cement rotary-kiln production, the oxygen supply procedure meets oxygen-enriched combustion-supporting requirements of dry-method rotary-kiln cement clinker burning, does not need to change any existing cement production equipment, and has the characteristics of low equipment investment, low operational energy consumption and obvious energy-saving benefit.

Description

technical field [0001] The invention relates to the technical field of dry-process cement production, in particular to an oxygen-enriched supply process for dry-process rotary kiln cement production. Background technique [0002] For a long time, the cement industry has been an important basic material industry for my country's national economic construction. In recent years, with the rapid development of my country's economy, its industry scale has also been greatly expanded. Although enterprises in the industry have undergone many mergers and integrations, they still have There are nearly 3,000 enterprises above designated size, and cement output has ranked first in the world for many years. At the same time, since the cement industry is also a major high-energy consumption and high-emission industry in my country, it is the focus and difficulty of energy conservation and emission reduction in the industrial field. , further improving cement production technology, increasin...

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Problems solved by technology

However, this technical solution has the following technical defects: first, due to the use of membrane separation to prepare oxygen-enriched, due to the technical limitations of membrane separation technology itself, the oxygen content in the prepared oxygen-enriched is low, even if two-stage membrane separation is used, only Oxygen enrichment with an oxygen content of about 40% can be obtained. The oxygen content in this oxygen enrichment is low, and it is difficult to achieve the purpose of flexibly adjusting the oxygen content of the net wind (central wind, axial flow wind) by mixing with air , so it can only be sent directly to the multi-channel pulverized coal burner, and it is difficult to realize the flexible adjustment of oxygen-enriched combustion; The realization of the combustion-supporting process needs to be based on high energy consumption; moreover, due to the use of membrane separation to produce oxygen-enriched and boost the pressure and send it to the burner, the coal air fan and net in the original dry-process cement rotary kiln process are discarded. blower, resulting in a large waste of investment, which is not conducive to the oxygen-enriched combustion transformation of the original process

However, this technical solution has the following technical defects: all oxygen-enriched addition methods are basically added on the side of the original air duct. Adding a booster fan at the output end of the source increases the investment and operating costs; it is difficult to fully mix the oxygen-enriched air with the air in the original pipe by adding it on the side of the second pipe, and it is difficult to ensure the stability of the operation; in addition, the clinker cooling process is used The generated high-temperature cooling air is added with oxygen-enriched air to form high-temperature oxygen-enriched air, and this high-temperature oxygen-enriched air is used as the primary air for pulverized coal transportation. This technical measure also has a large safety hazard

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