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介绍热电厂的余热资源、可利用的热泵技术,分析吸收热泵在热电厂余热回收中的技术特点和优势,提出吸收式热泵适合在热电厂中应用的结论,为热电厂选取余热回收技术提供了参考和借鉴。 相似文献
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本文针对某住宅区设置集中式空调系统的要求,对风冷热泵冷热水机组、水冷螺杆式冷水机组+燃油锅炉、由热电厂余热蒸汽驱动的蒸汽双效溴化锂吸收式冷水机组+热交换器和燃气直燃型溴化锂吸收式冷温水机组等四种冷热源方案作了能耗和经济性比较,认为利用热电厂余热蒸汽为能耗的方案是最适合该住宅楼的空调方案。 相似文献
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<正>近年来,基于吸收式热泵的火电厂循环水余热利用节能改造不断升温,先后在内蒙古、新疆、山西、黑龙江等地区建设投产并取得了良好的运营效果。这种节能改造项目利用冷却循环水作为第一类溴化锂吸收式热泵的低温热源,而汽轮机的采暖抽汽为其驱动汽源。为提高运行的可靠性,无论是作为驱动汽源的采暖抽汽还是作为低温热源的循环水,均与两台主机相连,两台机组互为备用。 相似文献
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采用吸收式热泵回收循环水余热用于供热机组,节能效益显著。在供热量、供热温度一定的情况下,为便于直观反映汽轮机与吸收式热泵整体供热系统性能随工况变化情况,以某350MW调节抽汽式汽轮机供热系统为例,将热泵系统、汽轮机凝汽器、热网加热器整体考虑,建立了供热系统热泵性能系数(COP)和发电功率增加值随工况变化的数学模型,并对热泵系统、整体供热系统进行了经济性评价。结果表明:放气范围、循环水入口温度降低,热泵的性能系数COP减小,发电功率的增加值增加。循环水温降降低,COP与发电功率增加值均提高。本文的研究为吸收式热泵与汽轮机的联合整体性能优化提供理论依据。 相似文献
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The present investigation reports a theoretical and experimental study of a wire screen heat pipe, the evaporator section of which is subjected to forced convective heating and the condenser section to natural convective cooling in air. The theoretical study deals with the development of an analytical model based on thermal resistance network approach. The model computes thermal resistances at the external surface of the evaporator and condenser as well as inside the heat pipe. A test rig has been developed to evaluate the thermal performance of the heat pipe. The effects of operating parameters (i.e., tilt angle of the heat pipe and heating fluid inlet temperature at the evaporator) have been experimentally studied. Experimental results have been used to compare the analytical model. The heat transfer coefficients predicted by the model at the external surface of the evaporator and condenser are reasonably in agreement with experimental results. 相似文献
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A heat pipe heat exchanger (HPHE) was used to investigate the heat transfer performance of steam-air mixture condensation, analogous to the dew condensation of flue gas, when the steam volume fraction ranged from 0 to 20%, and the inlet temperature of steam-air mixture varied from 70 to 120°C. Self-assembled monolayers (SAMs) treatment with n-octadecyl mercaptan was adopted to modify the condensation surface of the heat pipe. The comparisons were conducted to examine the influence of SAMs on condensation heat transfer of steam-air mixture vapor. The results indicate that the convection condensation heat transfer coefficient increases with the increase of steam volume fraction and Re number of the steam-air mixture. As the inlet temperature increases, the heat transfer coefficient decreases accordingly. The heat transfer performance can be improved by the SAMs surface, with a heat transfer enhancement ratio up to 1.6 at a condition of 20% of the steam volume fraction and 1500 Re number. 相似文献
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热管及其换热器在烟气余热回收中的应用 总被引:4,自引:1,他引:4
简要介绍了热管技术,并分析了其传热机理。热管换热器具有许多独特的优点,已经获得了广泛的工业应用,应用主要集中在中低温余热资源回收利用方面,应完善高温热管,以拓宽热管换热器在高温余热资源中的应用。 相似文献
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针对冬季太阳能辐射弱且不稳定的特点,提出一种应用于太阳能热泵的分区蓄热水箱,以水泵驱动蓄热水箱循环区与蓄热区的热量传递,并运用热力学原理对水箱循环区与蓄热区的运行状况进行模拟,分析了水箱两区在不同水泵体积流量下的逐时温度变化并与整体式水箱进行对比。结果表明,分区蓄热水箱克服了整体式水箱的热惰性,启动灵活,能在较短时间内达到热泵运行的理想温度,显著提高了系统的性能。 相似文献
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主要介绍了在冶炼余热制酸系统中热管余热锅炉出现的爆管现象,针对热管爆管的原因进行了分析,并提出了解决方案。 相似文献
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ALBERTO PIGNOTTI 《传热工程》2013,34(3-4):89-94
Sufficient conditions are given for a heat exchanger or an assembly of heat exchangers to be invariant under the interchange of the two fluids. Analysis of this symmetry is performed on tht basis of geometrical or topological properties of the exchanger, and no prior knowledge of the exchanger solution is required. The 1-2 and 1-4 TEMA E, the split-flow TEMA G, and the divided-flow TEMA J shell-and-tube exchangers are discussed as examples. A t tent ion is drawn to possible erroneous interpretations of published F-charts for stream-unsymmetric eases. 相似文献