Abstract:

In the production statement system of a power plant’s 1000MW ultrasupercritical unit, the counter balance net coal consumption value fluctuation is bigger than positive balance net coal consumption. Which did not satisfy the requirement of difference of positive balance and counter balance net coal consumption shall be less than 2%. To find the causes, heat balance was applied to evaluate unit performance. Factors that could influence counter balance net coal consumption were quantitively analyzed. The measurement tolerance, unknown leakage quantity, water supply pump seal leakage quantity and other factors were indicated. Realtime heat rate formula and accuracy of counter balance calculation was improved.

Key words:

ultrasupercritical, counter balance, net coal consumption, thermodynamic calculation