The Optimization Research For Recovery And Utilization Program Of Waste Heat In Industrial Flue Gas

Energy-conservation, as another important energy following after the coal, natural gas, petroleum, hydropower, and nuclear energy, plays an irreplaceable role in the country's increasingly tense situation in the energy. On the other hand, as a kind of clean energy, energy-conservation makes more indelible contributions to relieving the problem of environmental pollution that the industrial development brings. Energy- conservation work penetrates all aspects of life and production, of which the use of industrial waste heat energy is very important in a part of. The industrial waste heat resources of our country are abundant, but inefficient use and recovery of it, especially in low-temperature flue gas utilization of waste heat energy has great potential. In this paper, recovery and utilization of waste heat in the industrial flue gas as the main research subjects, the optimization research of the heat exchanger in the waste heat recovery as the focus, the optimization research for the recovery and utilization of waste heat in the industrial flue gas has been launched.In this paper, the use of waste heat of the flue gas general principles has been summed up from the thermodynamic point of view. The ways of utilizing flue gas waste heat of different temperature levels has been analyzed applying thermodynamics. And that, the heat exchanger in the waste heat recovery plays a critical role in the use of the flue gas waste heat of middle and low- temperature.The optimization research for the heat exchanger of waste heat recovery is the core content of this article. In this paper, the introduction of optimization (also known as the mathematical programming), a new model has been to bring up, which the value type dynamic evaluation indicators of technical and economic-net present value (NPV) as the optimized goal, the heat transfer area of heat exchanger in waste heat recovery as the design variables. With the second law of thermodynamics and technical economics theories, detailed building process of the mathematical model was derived. Than the effect of optimization model was validated through specific examples. The result reveals: Optimization of net present value than conventional design can achieve better economy efficiency and environmental benefits.The design and calculation of recovery and utilization of waste heat at tail flue gas was carry out, which is the part of the project of pulverized coal and lime rotary kiln togas burning in Tongshan County of Hubei Tongli Magnesium Indstry limited liability company , by optimization of net present value. The economy efficiency and environmental benefits after the recovery and utilization of waste heat was calculation. And it will offer the reference to the determination of project of recovery and utilization in the tail flue gas.In the optimal design model of the heat exchanger in waste heat recovery of his paper, not only the optimization problem of energy was considered, combined with technical economics theory, the time efficiency of capital has also been considered. Through analysis of the economic effect of the entire operation period after investment, a more comprehensive evaluation on the reasonableness of the recovery scheme can be made. Methods and conclusions of this paper can also be offered certain reference for the application of project.