Method and device for gasifying staged combustion of alternative fuel of cement kiln

Abstract

The invention discloses a method and a device for gasifying staged combustion of an alternative fuel of a cement kiln. The device includes a gasified gas outputted from a pyrolysis gasifier and tertiary air of cement kiln fed into a decomposing furnace of the cement kiln, wherein the tertiary air of cement kiln is divided into a first path of air and a second path of air; the two paths of air are respectively fed into the decomposing furnace from upper and lower ends; 10%-30% of total volume of the tertiary air, served as the first path of air, is fed from the bottom of the decomposing furnace; the rest tertiary air, served as the second path of air, is fed from the top of the decomposing furnace; the gasified gas, following the first path of air, is fed from the bottom of the decomposing furnace; the temperature of the flue gas at the outlet of the decomposing furnace is measured for adjusting the air feeding ratio of the first path of air to the total volume of the tertiary air and the feeding volume of the gasified gas. According to the invention, the pyrolytic gasified gas and the decomposing furnace are organically combined, the device has the characteristics of high thermal efficiency and uniform temperature distribution of the decomposing furnace, and the generation of nitric oxide is reduced by forming a reducing atmosphere by feeding coal and air at different ratios into the combustion chamber.

Description

technical field [0001] The invention relates to a cement kiln alternative fuel gasification staged combustion method and device. Use the fuel gas after waste gasification as a reducing agent to reduce the generation of nitrogen oxides in the production background, so as to achieve the multiple effects of reducing denitrification costs, saving coal consumption, reducing nitrogen oxide emissions and waste disposal. Background technique [0002] The cement industry is not only an energy-intensive industry, but also a major emitter of nitrogen oxides. The energy consumption of the cement industry accounts for about 6.5% of the country's total energy consumption. The fuel consumption of the cement industry accounts for 75% of the total energy consumption of the cement industry, while coal accounts for nearly 100% of the total fuel consumption. Moreover, a large amount of nitrogen oxides is emitted during the production process, with an annual emission of about 2 million tons, a...

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Problems solved by technology

However, with the improvement of efficiency, the consumption of ammonia water increases sharply, the efficiency improvement is not obvious, and the risk of ammonia escape increases

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