On-line Calculation Method of Raw Coal Moisture in Medium Speed ​​Coal Mill

Abstract

The invention discloses an online method for calculating the moisture content of raw coal in a medium-speed coal mill, which includes calculating the moisture content of coal powder; calculating the sealing air flow rate; calculating the amount of pebble coal; calculating the thermal insulation coefficient of the medium-speed coal mill; Calculate the heat absorbed by the raw coal and the sealed air; Calculate the heat taken away by the pebble coal; Substitute each data into the heat balance equation; Set up a comparison test to check the moisture content of the raw coal; Change the coal type and repeat the comparison test until you get stable parameter values. The method for online calculation of the raw coal moisture in the medium-speed coal mill is to sample and test the grinding product of the medium-speed coal mill, calculate the moisture of the raw coal through the heat balance equation, and set up multiple comparison tests to verify, which reduces the calculation error of the raw coal moisture. It is beneficial to make an accurate judgment on the coal type, to reasonably control the outlet temperature of the coal mill, and adjust the boiler operating parameters to the optimal value, thereby improving the thermal energy conversion rate of the raw coal.

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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