共查询到20条相似文献,搜索用时 156 毫秒
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嘉峪关宏晟电热公司2×300 MW纯凝机组是甘肃省内首家通过采用就地PLC与DEH协同控制低压抽汽蝶阀.实现纯凝机组增加抽汽供热功能的大型机组.300 MW纯凝机组改造为供热机组,其控制方式可能存在不合理及不完善的地方,会对主机造成安全隐患.通过修改低压抽汽蝶阀、快关阀等控制逻辑,增加"中压缸排汽压力大"及"高压缸排汽温度高"主机保护,经多次静态和动态试验对纯凝机组增加抽汽供热功能的投入进行论证考核,证明新的控制策略能够保证机组在增加抽汽供热功能后安全经济运行. 相似文献
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大型纯凝汽轮机供热改造节能研究 总被引:10,自引:0,他引:10
大型纯凝汽轮机供热改造过程中,由于中压缸级数相对于设计的供热机组少,导致中低压缸联通管打孔抽汽压力远远高于所需求的供热压力,造成可用能的节流损失。该文针对此问题提出了解决措施,即增加背压机,将较高压力的抽汽先做功发电后再进行供热。分别针对单机型和双机型大型纯凝汽轮机的供热改造建立了理论分析模型,结合实际300 MW机组的案例分析发现,采用增加背压机做功的模式,对单机型改造,可以在不影响供热效果的前提下,回收供热抽汽的动力,同时由于不与另外机组耦合,设备结构简单,运行控制简便;对双机型改造,设备连接虽相对复杂,但采用热网加热器的串联模式,能量的梯级利用更加合理,保证供热的条件下,回收了更多的供热抽汽动力。结果表明,新型的供热改造模式可以收到较好的综合经济效益。 相似文献
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王景和 《电力标准化与技术经济》2009,(11)
通过三河发电厂1、2号350MW纯凝发电机组改造为供热机组的设计优化与实施,解决了大型纯凝机组改造为供热机组中的一系列问题,为其它同类型机组改造设计提供了参考。 相似文献
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通过三河发电厂1、2号350MW纯凝发电机组改造为供热机组的设计优化与实施,解决了大型纯凝机组改造为供热机组中的一系列问题,为其它同类型机组改造设计提供了参考. 相似文献
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N110-90/535型汽轮机供热改造及经济性测算 总被引:1,自引:0,他引:1
介绍了N110-90/535汽轮机采用连通管抽汽供热改造的方案,并进行了初步的经济性测算,为同类纯凝机组的供热改造提供借鉴. 相似文献
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针对300 MW直接空冷、纯凝式汽轮机组,分析了供热改造工作的技术难题,确定了供热改造方案:在中、低压导汽管上开孔抽汽作为供热蒸汽。改造后,机组年平均热电比达51%,发电煤耗较纯凝工况下降5 g/kWh,机组效率提高10.22%,热耗率降低692.33 kJ/kWh。 相似文献
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恒运电厂5号机抽汽供热改造 总被引:1,自引:0,他引:1
介绍半高压单缸凝汽式汽轮机改造为抽汽拱热式组的设计思路及施工改造过程,对改造中出现的新问题进行了分析并提出解决办法,改造后,机组抽气直接供给热网,社会效益和经济效益明显。 相似文献
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等效热降法的改进计算方法 总被引:8,自引:3,他引:8
目前采用的汽轮机理想循环热效率受到相对内效率影响而不能准确反映汽轮机热力系统运行经济状态。同时,等效热降法计算中需要预先已知汽轮机排汽焓及回热抽汽状态点的焓值,而凝汽式汽轮机排汽焓及处于湿蒸汽区回热抽汽点焓值不能准确确定,从而导致等效热降法计算结果产生误差。针对上述问题,文中首先对理想循环热效率的定义方法进行了改进。然后,基于改进的理想循环热效率,提出了等效热降法的改进算法。该方法利用蒸汽等熵膨胀过程来确定等效热降,不仅避开了求解汽轮机排汽焓的难题,而且还可以分析引起热力系统经济性降低的原因和部位,从而为汽轮机热力系统经济性诊断提供了依据。通过与常规等效热降法计算结果的对比,证明了该改进方法的正确性。 相似文献
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介绍了几种纯凝式汽轮机组供热改造的方法,并分别进行了分析和比较,得出300 MW以上纯凝汽轮机组建议选择使用“压力匹配器法”和“联通管抽汽法”进行供热改造. 相似文献
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针对某发电厂采用300/330 MW亚临界机组替代原135 MW超高压机组对外抽汽供热的实际需求,根据区域供热发展形势,制定了具体的抽汽供热改造目标,研究了不同抽汽供热方案对机组运行安全性和经济性的影响程度,对抽汽供热改造和运行中可能出现的问题展开了讨论,有关评估和分析意见为抽汽供热改造项目的分阶段实施提供了技术指导. 相似文献
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A. E. Valamin A. Yu. Kultyshev A. A. Gol’dberg Yu. A. Sakhnin V. N. Bilan M. Yu. Stepanov E. N. Polyaeva M. V. Shekhter T. L. Shibaev 《Thermal Engineering》2016,63(11):771-776
A new condensing steam turbine K-65-12.8 is considered, which is the continuation of the development of the steam turbine family of 50–70 MW and the fresh steam pressure of 12.8 MPa, such as twocylinder T-50-12.8 and T-60/65-12.8 turbines. The turbine was developed using the modular design. The design and the main distinctive features of the turbine are described, such as a single two-housing cylinder with the steam flow loop; the extraction from the blading section for the regeneration, the inner needs, and heating; and the unification of some assemblies of serial turbines with shorter time of manufacture. The turbine uses the throttling steam distribution; steam from a boiler is supplied to a turbine through a separate valve block consisting of a central shut-off valve and two side control valves. The blading section of a turbine consists of 23 stages: the left flow contains ten stages installed in the inner housing and the right flow contains 13 stages with diaphragm placed in holders installed in the outer housing. The disks of the first 16 stages are forged together with a rotor, and the disks of the rest stages are mounted. Before the two last stages, the uncontrolled steam extraction is performed for the heating of a plant with the heat output of 38–75 GJ/h. Also, a turbine has five regenerative extraction points for feed water heating and the additional steam extraction to a collector for the inner needs with the consumption of up to 10 t/h. The feasibility parameters of a turbine plant are given. The main solutions for the heat flow diagram and the layout of a turbine plant are presented. The main principles and features of the microprocessor electro hydraulic control and protection system are formulated. 相似文献
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Heating calculation of the surface condensate heat recovery unit (HRU) installed behind the BKZ-420-140 NGM boiler resulting in determination of HRU heat output according to fire gas value parameters at the heat recovery unit inlet and its outlet, heated water quantity, combustion efficiency per boiler as a result of installation of HRU, and steam condensate discharge from combustion products at its cooling below condensing point and HRU heat exchange area has been performed. Inspection results of Samara CHP BKZ-420-140 NGM power boilers and field tests of the surface condensate heat recovery unit (HRU) made on the bimetal calorifier base КСк-4-11 (KSk-4-11) installed behind station no. 2 Ulyanovsk CHP-3 DE-10-14 GM boiler were the basis of calculation. Integration of the surface condensation heat recovery unit behind a steam boiler rendered it possible to increase combustion efficiency and simultaneously decrease nitrogen oxide content in exit gases. Influence of the blowing air moisture content, the excess-air coefficient in exit gases, and exit gases temperature at the HRU outlet on steam condensate amount discharge from combustion products at its cooling below condensing point has been analyzed. The steam condensate from HRU gases is offered as heat system make-up water after degasification. The cost-effectiveness analysis of HRU installation behind the Samara CHP BKZ-420-140 NGM steam boiler with consideration of heat energy and chemically purified water economy has been performed. Calculation data for boilers with different heat output has been generalized. 相似文献
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热电厂切除高压加热器运行的热经济性研究 总被引:2,自引:0,他引:2
以cc250-16.67/1.609/0.785型机组为例,运用热量法和焓降法,对抽汽凝汽式机组在尖峰电负荷下切除高压加热器运行的绝对内效率和热经济性进行了理论研究。研究结果表明在一定条件下,切除高压加热器后机组绝对内效率可以提高。对于回水人冷凝器的抽汽凝汽式机组,保持新蒸汽耗量不变,在尖峰电负荷下切除高压加热器运行,其绝对内效率与对外供汽量有关。当机组对外供汽量超过某一值时,切除高压加热器获得额外电功率的同时还可提高机组绝对内效率。通过计算其煤耗量,表明切除高压加热器后热经济性始终是降低的,与对外供汽量无关。 相似文献