The Research On The Best Way To Run Cogeneration Units Based On The Analysis Of The Energy Efficiency

Cogeneration is widely recognized as an effective energy-saving measures, but also an important means to improve the quality of the urban environment. It is the only way for the development of low-carbon economy. Thus is determined as ten key energy-saving projects, become an important direction of development of power industry at this stage. The heating unit often fluctuate deviates from the design value because of certain factors. If the operating parameters range within the allowable. Sometimes even larger changes. So research on heat economic calculation and optimization of heating unit runs very necessary.The main contents of this paper are:1. respect to the pure condensing unit the largest characteristics of heating unit is the existence of heating Extraction. Its thermal structure is very similar with the pure condensing unit. Based on the model of pure economic calculation hot condensing units, improved to accommodate thermal heating unit of economic calculation. Use computer program written Math CAD and examples of calculation. Compared with the design value, verify its correctness, meet the requirements of engineering calculations.2. In changing conditions, according to the characteristics of the heating unit, segmented use the Friuli Siegel formula. Taking a CC300-16.70 / 537/537-type steam turbine, for example, heat extraction flow, heat extraction pressure changes, variation of heating and condensing power generation. The results show, main steam pressure, main steam temperature, reheat steam temperature is respectively increased by 1%, thermal power generation increases of about 900 ~ 1100 k W, and condensing steam generation increased 400 ~ 600 k W;for each additional 10 t / h of heat extraction amount, thermal power generation increase of 1800 ~ 2000 k W, condensing steam generating power reduction 2200 ~ 2600 k W; for per 0.1Mpa reduce of heat extraction pressure, thermal power generation increase of about 1000 k W, condensing steam power generation increased slightly, but remained unchanged. 3. Conducted a variable condition calculation on heating unit, main steam pressure, changes in the main steam temperature, reheat steam temperature, heat extraction flow and extraction pressure on the unit coal consumption for power generation. Within a certain range of parameter perturbations, heating unit main steam pressure, main steam temperature, reheat steam temperature every 1% increase, respectively, heating unit coal consumption reduced 0.8 ~ 1.0 g / k W ? h, heat extraction increase per 10 t / h, coal consumption reduced 2.0 ~ 2.5 g / k W ? h, heat extraction pressure reduced every 0.1 Mpa, coal consumption reduced 0.7 ~ 1.0g / k W ? h, and showed a linear change.