Research On The Energy Saving Of 600MW Supercritical Unit Thermodynamic System Made In China

Nowadays supercritical technique is a heat-engine technology which is well-developed as well as developing in the world. It's more efficient than subcritical unit and has been directed into the developing orbit of the clean coal power generation. It has the double benefits of the energy conservation and the environmental protection.The supercritical unit developing in China is 30~40 years later than in those developed countries. It is advantageous and necessary to start with a higher level. Adopting the world's advanced technology and sophisticated experience, getting full use of the latest achievement of today's material industry in the world, and analyzing and optimizing to supercritical unit can make it exert all the benefits in the effect of energy saving. 600MW supercritical unit is becoming the major unit of the electric network in our country, but there are some gaps between our supercritical unit and other countries'at advanced level in some aspects such as design and operation. Thus, we need a systemic analysis, research and optimization to find out it's potential in energy saving, point out the way of supercritical unit's energy saving, and make supercritical unit to exert it's advantages verily.In this dissertation it is demonstrated that the supercritical unit's advantages in economy by using the method of payback period of investment. In the aspect of regenerative system analysis, basing the theory on the equivalent heat drop method, coupled with cyclic functional method, a concept of heater element's regenerative rate is put forward, and hereby a more precise estimating formulae is educed to make a smaller error in the course of calculating the thermal efficiency when the high-pressure heater stop running. In the fourth chapter, an optimization on the supercritical unit's condenser system is done, and the duplex pressure condenser used in this unit is analyzed and calculated by using the entropy generation theorem, and at last, the best distributive formulae on elevated temperature of circulation cooling water are got. In the fifth chapter, the theory on BP neural network is used to do a fault diagnosis on the high-pressure heater and the condenser of the supercritical unit, and a BP neural network's amelioration scheme is brought forward. This BP neural network arithmetic is applied to the fault diagnosis of condenser system. These disquisitive products will provide an impactful theoretical gist for the design optimization, circulation management and technique alteration of the 600MW supercritical unit made in our country.