Method for determining white plume control line of smoke after wet desulphurization

A method for controlling smoke plume emissions, comprising the following steps of:

• Step 1, drawing a saturated air enthalpy humidity curve or an equivalent curve;
• Step 2, obtaining temperature and relative humidity change data of located geographic areas along with a time at a frequency of at least one datum every day, where a sum of data collected every day is p, a data collection day number is m, and a sum of collected data is m*p;
• Step 3, drawing the data obtained in the Step 2 in the curve obtained in the Step 1, and correspondingly obtaining corresponding meteorological points;
• Step 4, drawing tangent lines on the curve by using the meteorological points obtained in the Step 3;
• Step 5, ranking a slope of each tangent line obtained in the Step 4 in an increasing order, where serial numbers are sequentially 0, 1, 2, . . . , m*p-1, a serial number of a magnitude of any one slope is defined to be n, and n is greater than or equal to 0 but smaller than or equal to m*p-1;
• Step 6, determining a white plume control line after wet desulphurization according to the slopes obtained in the Step 5;
• and
• Step 7, controlling the smoke plume emissions using the determined control line,
• wherein according to (m*p-n)/(m*p)*100, control lines with different values can be obtained, the tangent line with a smallest slope is a strictest white plume control line, a de-pluming day number control region corresponding to a smoke state is a 100% white-plume-free day number control region, and the corresponding tangent line is a 100% white-plume-free day number control line.