Multi-fuel combustion method for improving scorification and contamination properties of Zhundong coal during combustion

Abstract

The invention discloses a multi-fuel combustion method for improving the scorification and contamination properties of Zhundong coal during combustion. The multi-fuel combustion method comprises the steps of adding oil shale semicoke into Zhundong coal in a certain proportion, uniformly mixing, and adding the mixture into a coal fired boiler for combustion, wherein the mixture contains 30%-40% ofoil shale semicoke and 60%-70% of Zhundong coal in percentage by mass, and the maximum particle size of the components does not exceed 150 microns. By utilizing the multi-fuel combustion method, the alkali / acid ratio of the Zhundong coal can be effectively reduced, and the content of alkaline oxide in coal ash can be reduced, so that the scorification and contamination properties of Zhundong coalare obviously improved. The multi-fuel combustion raw material resources are rich, cheap and easily available, the utilization of oil shale semicoke is of a great significance to the saving of land resources and the protection of ecological environments, and additional heat can be generated during the combustion of the oil shale semicoke, so that a positive effect is achieved for the saving of theresources.

Description

technical field [0001] The invention relates to the technical field of coal combustion, in particular to a co-firing method for improving the slagging and contamination characteristics of Zhundong coal combustion. Background technique [0002] The Zhundong coalfield is currently the largest integrated coalfield in my country, with a predicted coal reserve of 390 billion tons. Based on the current annual coal production in my country, one Zhundong coalfield can be used by the whole country for 100 years. As one of the four major coal sources in Xinjiang, Zhundong coal has become the main coal used by power generation companies in Wuchang. Zhundong coal has a low ignition point, high burnout rate, high combustion economy, and low pollution emissions. It is an excellent power coal. [0003] However, because the content of alkali metal sodium oxide in Zhundong coal is generally above 2%, problems such as slagging and contamination have occurred in boilers burning Zhundong coal,...

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Problems solved by technology

[0004] On the other hand, with the rapid development of the oil shale industry, a large amount of oil shale semi-coke is produced, which not only occupies a large amount of land resources, but also causes damage to the surrounding ecological environment