共查询到19条相似文献,搜索用时 373 毫秒
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通过对某换热站新增区域的供热方式与原采暖用户进行系统分析,建议新增区采用间接连接和混水直接连接两种方案,并对两种方案给出详细的设计说明;通过对两种方案进行整体比较分析,综合得出混水直供换热方式运行经济,供热效果良好,尤其是区域供热新增区或新建区采暖用户的供热选择方式。 相似文献
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《热能动力工程》2016,31(6)
基于热力学定律与单耗分析理论,推导热电厂低真空供热的能耗分析方法,并进行能耗分析。结果表明:热电厂的总能耗水平由好到差依次为:抽汽+低真空供热工况、抽汽供热工况、纯凝工况;各子系统的火用效率和附加单耗由好到差的顺序依次为:低真空供热子系统、抽汽供热子系统、电能生产子系统;热电厂低真空供热时,背压、端差的取值存在一个最佳值,可由实例计算得到,且背压取值的乏汽温度为65℃,端差取值为3℃;热电厂利用低真空取代抽汽供热时,抽汽量也存在一个最佳值,实例计算最小抽汽量为283.96 t/h。可见,在电厂具有热用户的前提下,进行抽汽供热以及低真空供热改造是十分必要的。 相似文献
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Solar multi-mode heating system based on latent heat thermal energy storage and its application 下载免费PDF全文
为克服太阳能间断性和不稳定性的缺点进而实现太阳能集热与采暖的能量供需调节和全天候连续供热,提出了基于相变储热的太阳能多模式采暖方法(太阳能集热直接采暖、太阳能集热采暖+相变储热、太阳能相变储热采暖),并在西藏林芝市某建筑搭建了太阳能与相变储热相结合的采暖系统,该系统可根据太阳能集热温度和外界供热需求实现太阳能多模式采暖的自动控制和自动运行。实验研究表明:在西藏地区采用真空管太阳能集热器可以和中低温相变储热器很好地结合,白天储热器在储热过程中平均储热功率为10.63 kW,储热量达到92.67 kW·h,相变平台明显;晚上储热器在放热过程中供热量达85.23 kW·h,放热功率和放热温度平稳,储放热效率达92%,其储热密度是传统水箱的3.6倍,可连续供热时间长达10 h,从而实现了基于相变储热的太阳能全天候连续供热,相关研究结果对我国西藏地区实施太阳能采暖具有一定的指导作用。 相似文献
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Weilong Wang Yukun Hu Jinyue Yan Jenny Nystr?m Erik Dahlquist 《Frontiers of Energy and Power Engineering in China》2010,4(4):469-474
Energy consumption for space and tap water heating in residential and service sectors accounts for one third of the total
energy utilization in Sweden. District heating (DH) is used to supply heat to areas with high energy demand. However, there
are still detached houses and sparse areas that are not connected to a DH network. In such areas, electrical heating or oil/pellet
boilers are used to meet the heat demand. Extending the existing DH network to those spare areas is not economically feasible
because of the small heat demand and the large investment required for the expansion. The mobilized thermal energy storage
(M-TES) system is an alternative source of heat for detached buildings or sparse areas using industrial heat. In this paper,
the integration of a combined heat and power (CHP) plant and an M-TES system is analyzed. Furthermore, the impacts of four
options of the integrated system are discussed, including the power and heat output in the CHP plant. The performance of the
M-TES system is likewise discussed. 相似文献
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Combination of a grid connected photovoltaic (PV) plant with a compressed air energy storage system (CAES) and a city gate station (CGS) has been proposed and investigated recently, leading to satisfactory performance results. The only deficiency of this system is the huge amount of fuel required to provide its heating demand. In this work, feasibility of employing evacuated tube solar thermal systems to supply the heating demand of the hybrid power plant is studied. After presenting detailed mathematical modeling, the solar heating units and other components of the power plant are properly sized. The results of simulations demonstrate that a total of 7000 evacuated tube collectors are required in the system, leading to elimination of the air heater from the CAES system completely and 17.2% fuel saving at the CGS. The total annual solar heat of 17.5 GWh is supplied for the system, 214 GWh power could directly be sold to the grid, 9.7 GWh power slumps is recovered and 53.5 GWh power is produced at nights. In the end, internal rate of return (IRR) method is used to compare economically the proposed system with similar systems proposed previously, outperforming all of the other candidates with an IRR of 11.1%. 相似文献
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In this article, results are presented of annual simulations of a decentralized (regional) plant for the power and heat supply of a residential complex. This complex consists of four houses with 40 flats all in all. The annual power consumption of the complex is 157 MWh and the heat requirement is 325 MWh. The concrete dynamics of the energy demands over the year is taken into consideration. The energy supply system is composed of a power-controlled combined heat and power (CHP) plant (55 kW), a photovoltaic plant (PV array or PV plant) array for power generation as well as a field of solar thermal collectors with a short-term accumulator for water heating and a long-term accumulator for supplying heat for domestic heating purposes. Simulation results demonstrate that synergetic effects result from the combination of a CHP plant with wind power and PV plants of varying sizes, which have an effect on the cost effectiveness of the plant as a whole with the different dynamics of energy sources (wind and solar energies) and of the consumption of power and heat being the decisive factors. The power deficits of wind power and PV plants are compensated through the application of a natural gas-operated CHP plant. In almost all variants, the demand for fossil energy carriers is distinctly less than in conventional energy supply plants. 相似文献
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Because of the rapid expansion of intermittent renewable energy, conventional coal‐fired power plants, including combined heat and power (CHP) plants, are required to improve the quick‐response ability to respond the changing demand of the grid. However, the flexibility of CHP plants is not easy to be improved because of the restriction of traditional load variation mechanism. This work presents a comprehensive thermodynamic analysis on the flexibility‐improving scheme using the thermal energy storage (TES) capacity of district heating (DH) network. A typical CHP plant and related DH network were selected as a case study. The flexibility demand under the context of renewables accommodation in the short timescale (counted by minutes) and the operational characteristics of CHP plants were analyzed on the basis of experimental data and thermodynamics. Besides, the influence of heat supply adjustment on heat users' indoor temperature was quantified with a dynamic model, and the thermal inertia of the DH network is discussed. Moreover, a thermodynamic model for the load variation processes simplified with operational characteristics was established to analyze the response ability improvement of CHP plants. Results of the case study show, the scheme can shorten approximately 34% of the response time while almost have no influence on the indoor temperature of heat users. 相似文献
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阐述了齐鲁石化公司热电厂1号汽轮机组凝汽器余热利用改造方案,实现冬季凝汽器半侧循环水切换为工业水,与乏汽换热后作为化学水制水原水。改造后节能效果明显,经济效益显著。 相似文献