300 MW 机组循环水泵的在线优化运行

300MW机组循环水泵的在线优化运行田小冬,刘福君唐山热电公司,河北唐山063029[摘要]介绍了300MW机组循环水泵在线优化运行的计算方法、模块结构及优化实施方法。优化系统投入后,解决了循环水泵起停的随意性和盲目性,节电效果较好。[关键词]300MW机组;汽轮机;凝汽器;循环水泵;在线优化[中图分类号]TK264.1[文献标识码]B[文章编号]1002-3364(2008)01-083-02唐山热电公司300MW机组汽轮机为东方汽轮机式中:De为凝汽器蒸汽负荷,kg/s;Dw为循环水流厂制造的C300/220-16.70.3/537/537型、亚临界、一量,kg/s;h,为排汽焓;h为凝结水焓,kJ/kg。当排汽次中间再热两缸两排汽、抽汽供热式配3台长沙水泵压力变化不大时,△h=h,-h近似不变,一般取△h=厂生产的60IKXC-26型立式混流循环水泵。2台泵或2250kJ/kg。实测的不同台数循环水泵运行时的循3台泵运行时,凝汽器真空提高,供电煤耗下降,但循环环水流量和循环水泵总耗电量见表2水泵耗电量大,使供电煤耗上升。因此,合理安排循环表2不同台数循环水泵运行时的水泵的运行台数,对机组运行经济性具有重要意义。本循环水流量和循环水泵总耗电量文介绍了循环水泵运行台数在线优化的实施方法,以及1号机组2号机组在1号、2号机组上的应用情况循环水泵运行台数1循环水流量/t·h-1177483024040284182123096041177循环水泵功率/kW1237240234981325257936041循环水泵在线优化计算方法和步骤(3)凝汽器端差计算:(1)循环水入口水温t1为实测值与循环水泵运行台数对入口水温影响的修正值相加。试验测得不同台数循环水泵运行时修正数值见表1。式中:Aw为凝汽器冷却面积(18000m2);K为总体传表1不同台循环水泵运对循环水入口水温的修正值热系数:K=14650999qu,其中循环水泵循环水泵循环水泵循环水泵循环水泵9冷却表面清洁程度修正系数,开式循环时中=交运行台数由1台改由2台改由3台改由2台改0.8~0.85,闭式循环0.75~0.8,不清洁时流变至2台变至3台变至2台变至1台0.65~0.75,选取g=0.85;循环水人口温度+2+1.5修正值/℃1.1Cw流速与管径修正系数9((2)循环水温升△t计算由热平衡方程可求得:其中,Cw为循环水流速;d为冷却水管内径;h甫△-=x12中国煤化工CNMHG二00作者简介:田小冬,唐山热电公司副总工程师兼发电部部长xd6280@dtts.cnp—水温修正系数:9=1-014249(3-4)号机组Ds2号机组DCS:g=1+x-2DCS路由DCS路由器流程修正系数10-(1-4/35),x为凝汽器流程数。P双机服务器性能计算服务器厂内管理信息g蒸汽负荷修正系数:g=8(8-2),当dc>dc[用户门[用2】[用户3[用户时,=1,否则δ=dc/dc。其中,dc为单位面图1生产管理系统网络结构积蒸汽负荷;dcs为单位面积蒸汽负荷的临界值,dcs=(0.9-0.012t1)d;dc为设计单位面积蒸汽负荷,其值为30.1kg/m2。(4)计算不同台数循环水泵运行时汽轮机排汽温度式中:t,——汽轮机排汽温度(凝汽器压力pk对应的假定循环水泵台数改变后,查表得饱和蒸汽温度),℃C;(5)根据排汽温度t查出对应不同台数循环水泵通过凝结器变工况,计算出在假定勺循环水泵运行台数下排汽温度运行时的排汽压力p。(6)计算排汽压力变化对机组热耗影响。采用制造厂提供的额定工况下排汽压力对热耗影响的关系曲线与排汽量变化拟合方法计算。计算出汽轮机热耗变化后对经济响、循环水泵耗电量增加对经济(7)综合比较汽轮机热耗与循环水泵耗功的变化给出在线优化运行结果。[出优化运行结论图2循环水泵在线优化程序2循环水泵在线优化运行实现循环水泵优化运行是在生产管理信息系统上实现3循环水泵优化运行情况的,该系统的网络结构见图1。唐山热电公司1号、2号机组循环水泵优化运行模循环水泵在线优化运行计算机程序见图2。块于2006年10月30日投入运行,数据采样和模块运行周期为5min。循环水泵优化运行指导画面见图3。系统投运后,从根本上解决循环查看条件水泵的随意和盲目起停,保证了凝汽机组,[机热器真空接近最佳值,大幅降低了厂用环水运行导电,提高了机组运行经济性。2006年环水行方式色表示行色表永停环水系行运行11月循环水泵电耗为064%,同期电环家坛行状数耗为0.76%同比下降了0.12%。当前2台水索交图环水耗电折量金参考文献流[1]剪天聪.汽轮机原理[M].北京:水鹉⊙汽力电力出版社,1992位代号[2]C30022016.7/0.3/537/537型1#机组有功巧率汽轮机热力特性书[Z].东方汽轮机组么环水入口温度中国煤化工轮机设备及系统[M北京:CNMHG出版社,2006(下转第88页)图3循环水泵运行台数优化指示画面CAUSE ANALYSIS FOR STALL OF AXIAL FANS OPERATING IN PARALLELHOU Fan-jun, GENG Li", WANG Jia1. Shandong Electric Power Research Institute, Jinan 250002, Shandong Province, PRC2. Huangtai Themal Power Plant, Jinan 250100, Shandong Province, PRCAbstract: The stall of a forced draft fan and a primary air fan for boiler no. 2 in one power plant has been analysed. Through test andinspection, it was found that the main cause leading to stall of the forced draft fan is reversely installed the outlet guide blades, andthat leading to stall of the primary air fan is most higher ventilation resistance and most higher outlet temperature of the coal pulveri-er. After retrofitting, no stall appears again on the said forced draft fan and the primary air fan.Key words: axial fan; stall; guide blades; coal pulverizing system; ventilation resistance②必必办必必必必必必必必必必必必必办必必办必必办少②小必办必(上接第79页)PROBLEMS EXISTING IN THE SPRAYING SYSTEM OFLARGE TOOTH GEAR IN BALL MILLSLi Xionglodian Anshun Power Plant, Anshun 561000, Guizhou Province, PRCAbstract: In operation of the spraying system for large tooth gear in the ball mills at Guodian Anshun Power Plant, some problemsuch as troubles of the spraying oil pump frequently occurred, and the reversal valve of the spraying head can't automatically opera-ted etc, have often appeared. For this, analysis has been carried out, and corresponding measures being put forward. After imple-mentation,the troubles have been substantially reduced, ensuring normal operation of the system.Key words: ball mill; tooth gear; spraying oil pump; reversal system少①少①必必①小必办(上接第82页)COORDINATING APPLICATION OF FUEL GASCOMPRESSOR ON MICRO- GAS- TURBINEZUO Zhi- yuan, LI Xi-ya, YANG Xiao-xiDongguan College of Science Technology, Dongguan 523808, Guangdong Province, PRCAbstract: The influence of fuel gas pressure upon the performance of micro-gas-turbine has been briefly discussed, the developmentsituation of fuel gas compressor applied in coordination with micro-gas-turbine being presented. Combined with actual situation ofthe designed pressure in pipelines of the natural gas transportation and distribution system and the end- pressure of customers, aapproach to the influence of fuel gas compressor upon the strategic decision of a micro-gas-turbine project has been made, and somerecommendations for equiping fuel gas compressor being put forward.Key words: fuel gas compressor; micro-gas-turbine: transportation and distribution of natural gas: distributed energy system: pipeline pressure技术交流D必必必必①必①①必②必分①办必必办必①必小必必①必必必(上接第84页)ON- LINE OPTIMIZED OPERATION OF THE CIRCULATING WATERPUMP FOR 300 MW UNITTIAN Xiao-dong, LIU Fu-junTangshan Thermal Power Co Ltd, Tangshan 063029, Hebei Province, PRcAbstract: The calculation method, module structure, and optimization中国煤化工 imized operation for circulting water pump of 300 Mw unit have been presented. After putting theCNMHGthe casualness and blindnessA n start-up and shutdown of circulating water pump have been overcomebetter electricity- saving effectivenesKey words: 300 Mw unit; steam turbine; condenser: circulating wateron-line optimization