Technical Aspects and Energy Effects of Waste Heat Recovery from District Heating Boiler Slag
Technical Aspects and Energy Effects of Waste Heat Recovery from District Heating Boiler Slag
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DOI：
10.3390/en11040796
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发表时间：
2018-03
期刊：
影响因子：
3.2
通讯作者：
M. Tańczuk;M. Masiukiewicz;S. Anweiler;R. Junga
中科院分区：
文献类型：
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作者：
M. Tańczuk;M. Masiukiewicz;S. Anweiler;R. Junga
在一些欧洲国家的供热系统结构中，煤炭继续占主导地位。区域供热和发电系统中的燃煤锅炉伴随着大量炉渣和灰的形成。由于相当高的温度，炉渣可以用作废能的来源。分析了45MW炉排燃烧区域供热锅炉炉渣物理焓回收的技术可行性。本研究的目的是估算分析锅炉中炉渣的废能潜力，并提出余热回收系统的建议。研究了现有除渣系统的建造和设计。研究表明，高水温会加速系统磨损。从该系统中回收热量可降低水温，从而延长无故障工作时间。确定了锅炉出口温度和出渣水缸温度等炉渣参数。估算了年蓄热潜力。在此基础上，提出了一种采用高温R134a热泵系统的余热回收装置。所进行的研究的结果是，所提出的热泵通过回收58.8%至88.0%的能量渣潜力提供了值得考虑的节能。
Coal continues to dominate in the structure of the heat production system in some European countries. Coal-fired boilers in district heating and power generation systems are accompanied by the formation of large quantities of slag and ash. Due to considerable high temperature, slag may be used as a source of waste energy. In this study, the technical possibilities of recovery slag’s physical enthalpy from grate-fired district heating boiler of 45 MW thermal capacity are analyzed. The aim of the work is to estimate the waste energy potential of the slag in analyzed boiler and proposition of the heat recovery system. The construction and design of the existing deslagging system was examined. Studies have shown that high water temperature accelerates system wear. Recovering heat from this system decreases the water temperature, which extends the trouble-free working time. The slag parameters were determined, including the temperature at the outlet of the boiler and the temperature after leaving the slag water tub. The annual amount of heat regenerative potential was estimated. On the basis of the research, the authors propose a waste heat recovery facility with high temperature R134a heat pump system. The result of the conducted research is that the proposed heat pump provides energy savings that are worth considering by recovering from 58.8% to 88.0% of energy slag potential.