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纯冷凝机组供热改造可行性分析 总被引:3,自引:0,他引:3
叙述了纯冷凝机组改造为热电联产机组的可行性以及改造的方法和范围。并就机组改造后的经济性进行了分析。对有意进行供热改造的用户有一定的借鉴意义。 相似文献
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《汽轮机技术》2021,63(2)
针对东北地区某供热机组因容量小、供热面积大、投入低压旁路时降电负荷的措施无法实施,进而导致冬季供暖期热电耦合矛盾异常突出的技术难题,研究提出了低压旁路至抽汽供热系统的改造方案和改造后机组的运行方案,给出了供暖期两台机组协同调峰措施,并对改造后的投资收益进行了分析。研究得出,抽汽供热机组进行低压旁路至采暖抽汽系统改造,将原排至凝汽器的蒸汽热损失回收至热网进行利用,在提升供热能力及机组效率的同时,解决了供暖期抽汽供热机组深度调峰时的热电解耦问题。改造后发电负荷降低5.0MW,增加热网供热能力20GJ,有效地提升了机组供热能力。改造后供暖期日平均收益约1万元,15天回收投资,经济效益显著。 相似文献
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介绍了供热方上海漕泾电厂1000MW超超临界汽轮机各级抽汽的参数及热用户蒸汽需求。针对两种供热方案论述了供热改造的安全性、可行性,分析了供热的经济性。改造后的性能试验结果验证了供热改造的安全性、经济性。 相似文献
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胜利油田井下作业二公司作业一大队的污水源热泵供暖系统在运行中存在的问题有:1号机组1、6、7、9号模块全年不能启动运行;1、2号机组20台模块不能全部同时运行;热水循环系统循环泵配置不合理;1、2号机组污水侧、热水侧温差相差较大;热泵投产以来,运行参数未能达到设计指标;热泵热水出水温度不稳定;热泵设计热水出水温度低,供暖质量差;污水换热器结垢腐蚀严重;热泵供暖系统运行参数计量仪表配备不完善等。提出了两种改造方案,方案一的改造思路是解决目前热泵运行中的故障,保证现有热泵系统的20台模块均能正常运行,同时视情况适当增加单模块数量,以提高热泵系统的负荷;方案二的改造思路是在保证原有热泵正常运行情况下,可新增6台或10台高温热泵与原有热泵机组采用串联或并联连接。通过比较,最后采用方案一进行改造,达到了预期目标。 相似文献
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根据老城区集中供热系统工艺过程特点,提出热网水力平衡、改善热源运行调节、全面的节电技术改造及分时分区温控供暖等措施与方法,改善实际供暖情况。 相似文献
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The objective of this study is to develop a series solution for determination of the temperature field in parallel-plate ducts with prescribed wall heat flux. Consideration is also given to ducts filled with fluid saturated porous materials. A simple transformation is used to improve the convergence of this series solution. Temperature variations and heat transfer coefficients are determined for infinitely long parallel-plate ducts when the walls undergo a step change in the applied wall heat flux. Axial thermal penetration near the applied wall heat flux location is studied. The solutions with the contribution of axial conduction in these fluid passages are acquired using a modified Graetz-type solution. Finally, this technique is augmented by the contribution of frictional heating. 相似文献
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《International Journal of Heat and Mass Transfer》2007,50(23-24):4600-4606
An exact solution was developed for a quasi-steady-moving-interface heat transfer problem in laser transformation hardening by a beam customized to a flat-top rectangular shape. The absorption and release of the latent heat were taken into account. The solution provided the body temperature, heating rate, and subsequent cooling rate. Using the IT and CCT diagrams, the rapid austenitization and pearlitic/martensitic phase transformation were determined for prediction of the hardening effect. In the experimental study, a diffractive optical kinoform (DOK) was used to customize a conventional Gaussian laser spot beam to a flat-top rectangular beam. A reasonable agreement between the theoretical predictions and the experimental measurements was obtained. 相似文献
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A numerical study is made of the melting of ice in a rectangular porous cavity heated from above. The Landau transformation is used to immobilize the ice-water interface, and the Darcy-Boussinesq equations are solved by a finite-difference technique. Results are analyzed in terms of the heating temperature and the aspect ratio of the cavity. A comparison is made with the case of melting from below. It was found that melting from above is more effective than melting from below when the heating temperature is between 0 and 8°C: convection arises earlier, the melting process is faster, and the total melt at steady state is thicker. The critical time for onset of convection is minimum when the upper boundary is heated at 6°C. At this heating temperature, one also obtains a maximum heat transfer rate (Nusselt number). 相似文献