洛阳石化4号、5号汽轮机节能优化运行

Achieving Energy-Efficient Operation of NO.4 and NO.5 Turbines for Sinopec Luoyang Company

中国石化洛阳分公司有三台在役余热发电机组,2008年后由于催化工艺变化,中压蒸汽产量不足,故1号机长期停运,4号机、5号机运行,且5号机一直维持纯凝工况。由于机组汽耗率和机组设备状况、机组负荷、实际主汽、排汽参数等多种因素有关,实际机组的汽耗率应是一条与理论值存在一定偏移量的近似直线。文中机组供热发电的汽耗率就是供热蒸汽发电的汽耗率。利用大量的运行统计数据,进行统计建模、求解的方法获得4号机、5号机发电汽耗率曲线,并进行对照分析,得到4号机维持空转需要8.37t/h蒸汽,且5号机的电效率略高于4号机的结论。计算结果显示,如果停掉4号机,将4号机的供热蒸汽量改由5号机抽汽来供应,在同样的中压蒸汽流量和供热蒸汽量情况下,可增加发电负荷0.57MW/h,按照每年运行8400h计算,则每年可增加发电量478.8×104kW.h。

Sinopec Luoyang Company originally had three residual heat power generators in use.Since 2008,its No.1 generator has been idled due to the change of catalytic process and the shortage of medium-pressure steam output.The No.4 and No.5 generators are still operating,but the No.5 has always been operating in the pure condensation working condition.As many factors affect the steam consumption of the generators including the conditions of the generators,the load of the generators,the actual main steam flow and exhaust conditions,the actual steam consumption of the generators should be an approximate straight line with an offset from the theoretical value.The steam consumption in heat supply and power generation mentioned here is just the consumption of the steam intended for heat supply but used in power generation.Researchers obtained the curves of steam consumption in power generation for No.4 and No.5 generators using a sea of operation statistic data to model the consumption.After comparison and analysis,they concluded that 8.37t/h of steam is needed to sustain the idling of No.4 generator and that the power efficiency of No.5 generator is higher than that of No.4 generator.Computation results show that if No.4 generator is shut down and the steam supplied previously by No.4 is supplied by No.5 generator through steam extraction,at the same medium-pressure steam flow and the same amount of steam supplied,the generator′s working load could rise by 0.57MW/h.If the generators operate 8400 hours per year,power output from them could rise by 478.8×104kW·h per year.