Cogeneration, Centralized Heating System, Energy-saving Technologies And Environmental Benefits Evaluation

Concentrated supply of heat and electricity combination has a great benefit on saving energy, improving environment, raising the quality of heat supply and increasing the electricity supply. The construction of the plant is an important measure of dealing with the air pollution and increasing the energy utilization ratio and a very important part of concentrated heat supply as well as basic public construction, which can improve citizen's life condition obviously. Taking Dalian Dye and Chemicals Co Ltd. self thermoelectric plant as an example, this passage has entered on the following discussion on the technical analysis of energy saving and benefit on environment protection.(1) In view of China's present conditions of energy using and taking coal as the main energy supply, the method of concentrated heat supply of the thermoelectricity cogeneration has a great benefit on saving energy and environment continuing development.(2) Based on the thermodynamic first rule, a practical method named heat economic quota method, is employed to analyze and calculate the heat supply of the thermoelectricity cogeneration. Although it explains the total benefit on energy using, it does not demonstrate the thermodynamics perfect condition. But exergy analysis method, based on the thermodynamics first and second rules, can satisfy the thermodynamics perfect condition. Throughout the analysis and calculation of thermoelectricity cogeneration, exergy analysis method, we can know the system's energy lose ratio and its reason, and endeavor to improve the technology for energy return.(3) Heat economic of the thermoelectricity combination and the benefit to environment protection mainly depend on principle thermoelectricity system's conjecture and choice of the main equipment, especially including a boiler style and its heat supply solution and parameters. According to the power plant's heat load quantity and characters, the dissertation seriously chooses equipment fixing plan and unit parameters, after analysis and calculation, derives useful results.(4) Thermal pipelines are important parts of concentrated heat supply of the thermoelectricity combination. According to the thermal lube service prospect, the paper calculates thickness of the buried steam pipe, proposes a new opinion of the interface temperature controlling method, and also attempt to determine the resistance loss of the minimal steam tubes and wrote its program.