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In chemistry, an ideal solution or ideal mixture is a solution with thermodynamic properties analogous to those of a mixture of ideal gases. The enthalpy of mixing is zero as is the volume change on mixing by definition; the closer to zero the enthalpy of mixing is, the more "ideal" the behaviour of the solution becomes. The vapor pressure of the solution obeys Raoult's law, and the activity coefficient of each component (which measures deviation from ideality) is equal to one.
Method for evaluating effect of coal gasification slag dewatering agent
A method for evaluating the effectiveness of dewatering agents for coal gasification slag includes: obtaining dewatering efficiency indicators (agent dosage, filter cake moisture content, dewatering rate, and specific resistance) of coal gasification slag after conditioning with different dewatering agents; performing homogenization and dimensionless processing on the indicator data; objectively calculating the weights of each indicator based on the dispersion of the coefficient of variation method; constructing a weighted normalized matrix based on the TOPSIS method to determine the positive and negative ideal solutions; calculating the basic comprehensive efficiency index of each agent scheme; and introducing a working condition correction factor to correct the basic comprehensive efficiency index to obtain the comprehensive dewatering efficiency index, where a larger index value indicates a better overall dewatering effect of the agent scheme. This invention achieves comprehensive evaluation of multiple indicators through objective weighting using the coefficient of variation method, combined with the TOPSIS method, and introduces a working condition correction factor to enhance cross-working condition comparability. This provides a scientific, quantitative, and reliable decision-making basis for the screening and process optimization of coal gasification slag dewatering agents.
Owner:CHINA UNIV OF MINING & TECH