Hearth ash blowing method

The invention discloses a hearth ash blowing method. The hearth ash blowing method comprises the following steps that a hearth ash blowing optimization model is established; the upper limit and the lower limit of the critical pollution rate F<max>, the reasonable ash deposition time tau j and the ash blowing duration tau c are solved according to the hearth ash blowing optimization model; and start and stop of ash blowing of a hearth are controlled according to the upper limit and the lower limit of the critical pollution rate F<max>, the reasonable ash deposition time tau j and the ash blowing duration tau c. According to the hearth ash blowing method, on one hand, visual data of the real-time ash deposition condition of the hearth can be provided, effective reference is provided for ashblowing operation of the hearth, on the other hand, a ash blowing scheme is formulated by integrating the critical pollution rate and the ash blowing period, more appropriate ash blowing time and themost appropriate ash blowing duration are obtained, the heat transfer amount of the hearth based on unit time is maximized, and the operation effects of energy conservation, emission reduction and safety guarantee are achieved.