| Energy resources are relatively scarce and energy efficiency is quite low in ourcountry, which directly restricts the development of the national economy. There exists ahuge potential for energy savings in thermal power-based energy industrial processes, byusing reasonable means and methods to save energy, a profound impact on protection ofChina’s energy economy and ecological environment has come into existence. In thiscontext, with thermal power units as the main object of study, thermo-economic analysismethods as the research tool of the study, through the improvement and innovation of thethermo-economic method, reliable scientific theory of transformation basis was providedfor thermal power energy saving and optimization of thermal system.Several traditional thermal analysis methods in economics were described, and theproblems and limitations of methods were pointed out; exergy equivalent drop theorywas taken as the basement, exergy equivalent drop in thermal system were defined,quality coefficient of equivalent exergy-drop were proposed and used to build a matrixmodel of economics supplementary heat equation, the equivalent thermal coefficientmatrix equation was constructed, N315-16.7/538/538unit was taken as an example toconduct thermal economic analysis, whose results wre compared with classic matrixmode heat economics, which verified the correctness of the method.Take structural coefficient as the basement, on condition of constant power, bymeans of Matrix method and theory of partial differential, structure coefficient matrixequation of a thermal power regenerative system was established so that the coefficientof structural bonds and the coefficient of external bonds throughout the system wereachieved, these coefficients reflected how the local changes in the system affect theentire system, thus the partial rehabilitation programs of the system can be discriminated,N1000-25/600/600unit was taken in to analysis as an example;Take N600-25/600/600thermal power unit for example, quality coefficient ofequivalent exergy-drop method, economic methods and thermoeconomic structure theorybased on structural coefficient were used to do thermo-economic calculation and analysison THA,75%THA and50%THA condition of the unit, the three methods werecompared, the results show that these three methods focus on the distribution of the fuel consumption in the system equipment when applying to the thermal economics analysis,the difference is that quality coefficient of equivalent exergy-drop method pays attentionto the forming process and distribution laws of the unit exergy cost for exergyflow,thermoeconomics method based on structure coefficient considers the system’sinfluence on the overall fuel consumption, and thermoeconomic structure theory regardsfuel components and unit exergy cost of products as the basis of system performanceanalysis; Using quality coefficient of equivalent exergy-drop and coefficient of externalbonds can quantitative analysis the economy of energy-saving scheme for unit, howeverthermoeconomics structural theory so far has not been applied in this area; qualitycoefficient of equivalent exergy-drop method on the construction of supplementaryequation is not only reflected the quality of high and low energy, at the same timeconsidering the exergy flow into energy system the location of the different influence onenergy utilization degree, thermoeconomics method based on structure coefficient canfind the influence on overall exergy loss or input exergy by local exergy loss or inputexergy, in order to better determine the overall layout of system structure. |
