Partial oxygenation combustion-supporting device and method for rotary kiln

Abstract

The invention relates to a partial oxygenation combustion-supporting device and a method for a rotary kiln. The device is placed beside the rotary kiln and comprises an oxygen source, an oxygen enrichment preheater, an oxygen enrichment spray nozzle, an oxygen enrichment pressure transmitter, an oxygen enrichment concentration transmitter and an electric control gear. A spray opening of the oxygen enrichment spray nozzle is an arc-shaped flat opening and is plugged into a shield wall of a hot kiln hood of the rotary kiln through a sleeved pipe and is arranged according to specific positions, so that the method of the arc-shaped partial oxygenation combustion-supporting is achieved. The advantages of partial oxygenation combustion-supporting technology are fully expressed, the energy conservation and high efficiency are balanced, and obvious comprehensive energy conservation and emission reduction benefits are obtained. The partial oxygenation combustion-supporting device and the method for the rotary kiln can be widely used for most fuels and a variety of rotary kilns.

Description

technical field [0001] The invention relates to combustion equipment, in particular to a local oxygen-increasing combustion-supporting device and integrated technology for a rotary kiln. Background technique [0002] At present, the general rotary kiln uses ordinary air combustion or overall oxygen-increased combustion. The former, because the air only contains less than 21% oxygen, and the rest is inert gas, not only does not participate in combustion, but absorbs a lot of heat, thereby reducing the rotary The performance and efficiency of the kiln, etc., while the latter generally has a very large investment and many side effects, such as a significant decrease in furnace life, NO X Significantly improved etc. For example, in the scheme of Chinese utility model patent 201120253557.8 (CN202177298U), "a blower and a pre-mixer are provided at the lower part of the grid cooler, which are used to mix the normal air of the secondary air and the oxygen-enriched air of the second...

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Problems solved by technology

"Because there are many factors affecting the cement rotary kiln, the kiln is often shut down, so it is inconvenient to use the center pipe, and the angle cannot be adjusted, so the use effect is greatly reduced; CN202390203U has more prominent problems in terms of practical effect: The practice and research of oxygen membrane separation and application can prove that the above-mentioned patents have relatively high energy consumption in oxygen production, especially the second-stage membrane separator, which has higher energy consumption, and the energy consumption cost is more expensive than the equipment cost; if according to The 3000Nm proposed in the aforementioned patent 3 / hr as an example, the annual operating energy consumption cost of the first-stage membrane separator is at least 1 / 2 of the equipment cost, while using VPSA, the equipment cost is more than 10% lower than that of the membrane method, and the energy consumption cost is only 1 / 2 of the membrane method About 65%; In addition, this patent "sends oxygen-enriched gas into the multi-channel burner", which is the same as the technical solution described in CN201344555Y or CN101487593A. It is used as primary air without oxygen-enriched nozzles, and the best energy-saving and emission-reduction effects cannot be achieved , cannot give full play to the advantages of local oxygen-increasing combustion-supporting technology

In addition, the above-mentioned technologies all use membrane method oxygen source, and adopt water ring vacuum pump and gas-water separation, dehumidification and voltage stabilizing device.

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