Method for calculating moisture of raw coal in medium-speed coal mill online

Abstract

The invention discloses a method for calculating the moisture of raw coals in a medium-speed coal mill online. The method comprises the steps of calculating the moisture of pulverized coals, calculating sealing air flow, calculating a pebble coal amount, calculating a heat preservation coefficient of the medium-speed coal mill, calculating heat released by primary hot air, calculating heat absorbed by the raw coals and sealing air, calculating heat taken away by pebble coals, plugging each data into a heat balance equation, setting a contrast test and verifying the moisture of the raw coals, and replacing a coal type and repeating the contrast test until a stable parameter value is obtained. The invention discloses the method for calculating moisture of the raw coals in the medium-speed coal mill online. A ground product of the medium-speed coal mill is sampled and tested, the moisture of the raw coals is calculated through a heat balance equation, multiple sets of contrast test verification are set, a calculation error of the raw coal moisture is reduced, the accurate judgment on the coal type is facilitated to reasonably control the outlet temperature of the coal mill, boiler operation parameters are adjusted to optimal values, and therefore the heat energy conversion rate of the raw coals is improved.

Description

technical field [0001] The invention relates to the technical field of thermal detection, in particular to a method for online calculation of raw coal moisture in a medium-speed coal mill. Background technique [0002] Thermal power generation is a power generation method in which the heat generated by the combustion of raw coal is used to heat the water in the boiler, and the boiler water is heated and evaporated into water vapor to drive the generator to obtain electrical energy. my country has abundant raw coal reserves, and domestic and industrial electricity mainly comes from thermal power generation. It can be said that coal has long affected people's way of life. The coal quality of raw coal determines the combustion rate and thermal energy conversion rate of raw coal. Therefore, monitoring the coal quality of raw coal is conducive to improving the utilization rate of raw coal and reducing electricity costs. At present, the coal quality status is mainly evaluated by ...

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Problems solved by technology

[0004] Based on this, it is necessary to provide an online method for calculating the moisture content of raw coal in medium-speed coal mills for the technical problems of online measurement or identification of coal quality data in real time.

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