New And Efficient Inorganic Heat Transfer Technology In Waste Heat Recovery Applied Research

The inorganic heat transfer technology is a newly-developed high efficient energy conservation technology in recent years. The components of inorganic heat transfer overcome a lot of limits existing in the conventional steel-water heat pipes and show their wonderful characteristics of heat transfer and an application potential. In the first, this paper makes an analysis and discussion on the different mechanism, performances, advantages and disadvantages of heat transfer between conventional steel-water heat pipes and components of inorganic heat transfer. What's more, the theory analysis and experiment research on the performances and applications of the components of inorganic heat transfer are also carried out.In the second, the paper carries out an application research on this technology in the field of waste heat recovery, especially on the structure of equipment and the efficiency of heat recovery. Based on these researches, the paper analyzes the performance of the equipments which use the inorganic heat transfer technology and their effects of heat recovery from the view of theory of heat energy engineering and techno-economics. The inorganic heat transfer technology is used to two projects of heat recovery, one is the heat recovery steam-generator retrofit in a steel-making cooling agglomeration machine of a steel group, the other is an air pre-heater design in oil-refining atmospheric pressure heating furnace of a petrochemical enterprise. In addition the thermodynamic calculations and real designs of heat recovery steam generator and air pre-heater in the plans have been carried out.In the third, this paper makes a survey on components of the exhausted flue gas and waste heat resource, and discusses the possibility and methods of steam generation and air preheating with the waste heat. And then, the analysis on the advantages and disadvantages of heat recovery plants with conventional steel-water heat pipes and inorganic heat-transfer heat pipes is carried out. The paper also gives a valuation about the plan and features of the design of heat recovery. Based on these analyses, the paper develops a mathematic model for the design calculation of heat recovery, which includes thermodynamic calculation, calculation of flow resistance and calculation of intension, and makes a program for the design calculation of heat recovery. By use of this program this paper gains the parameters and results of the design. Moreover, the paper finishes the design of heat-pipe allocation and the design of detailed structures of the equipment, and gives relevant drawings of the design.In the end, the paper makes an thermodynamic analysis, evaluation of investment and techno-economic analysis on the retrofit plans of heat recovery steam generator and air pre-heater, which helps to make the evaluation of the plans from the view of energy conservation and economy benefit. These analyses indicate that the periods of time for equipment investment reclaim are from 5 to 15 months, which shows their economic benefit efficiency and energy conservation efficiency are remarkable.