Water lever control of IP steam drum put hardly into automation during unit startup and shutdown stage because of low capacity of IP steam drum is designed of Heat Recovery Steam Generator(HRSG) of M701F combine cycle generation unit.In this article,it explained the feature and difficulty of water lever control of HRSG IP steam drum of M701F combine cycle DSS operation unit;and analyzed in detail the water lever control of HRSG IP steam drum during the three stage of steam drum feed-up water,startup and increase load,and normal operation,the improvement and solution on the issue mentioned at the end is good effect,and it can use for reference and draw on the experience of other brother power station.
At present, the extrusion force formulas used in calculating backward extrusion are all based on the according direct extrusion's, and the friction between the metals and inside of the container is assumed to become zero. In practice, the calculated extrusion force according to these formulas has much difference with the real figure frequently, which can not guide production. The main reason is to neglect the difference of the temperature rice and strain hardening between the direct extrusion and the backward extrusion. Through the experiment, the backward extrusion force formulas were found. The error of backward extrusion force calculated by the formulas is not more than 5%, so it can be applied in engineering calculation.
