冶金企业大型高炉TRT湿式改干式的研究与应用

发布时间：2018-04-20 15:13

本文选题：大型高炉 + 煤气余压发电装置　；参考：《天津大学》2015年硕士论文

【摘要】：高炉煤气余压发电装置作为钢铁企业重要的能量回收装置,在国内外钢铁企业已普遍应用。但随着大型高炉除尘系统由干法除尘工艺取代原湿法除尘工艺的改进成为发展趋势,新的干法工况下,干法除尘煤气的温度、压力、流量等参数发生很大变化,原大高炉配套的湿法TRT系统不能适应新的干法工况的需求。论文结合包钢4#高炉率先在全国范围内成功实现了2000m3以上型大高炉干法除尘冶炼的实际,通过研究、总结包钢4#高炉配套的原湿法TRT改造为干法TRT的成功实践,为全国同行业TRT湿式改干式工作提供可鉴借的成功经验。使大型高炉TRT湿式改干式能够在最短的时间,尽可能少的投入资金的情况下,实现大型高炉TRT的成功改造,进而实现企业效益的最大化。论文重点从TRT系统的主机系统改造、管道阀门系统改造和自动控制及电气系统改造等几方面展开研究。首先,对TRT透平主机系统进行了改造。通过对转子、动静叶和承缸的材质、结构形式改造;密封体由原来梳齿型密封改造为梳齿型密封加碳环密封;扩压器改造,使TRT在主机系统适应了煤气温度、压力和流量等参数的变化,解决了新的工况下TRT转子热膨胀、叶片磨损,动静叶间隙变化大,煤气通透量制约,煤气泄漏等问题,使主机系统满足了干法工况下长期、安全、稳定运行。其次,对TRT管道系统进行了改造。在TRT出口管道增加矩形波纹管补偿器,并将原出口管道上的压力平衡式补偿器更换为复式波纹管补偿器。TRT入口管道及阀门进行了保温处理及TRT出、入口阀门系统的改造,解决了TRT管道系统由于干法煤气温度升高,造成管道伸缩量和由此产生的应力问题,满足了管道系统的整体安全运行要求。第三,通过对原湿法TRT的DCS控制系统的改造,TRT液压伺服控制系统改造、TRT动力油系统改造,以及TRT发配电系统的改造,解决了原控制系统不稳定,操作、维护不方便,以及原有的高、低压配电系统设备老化、容量小,故障率高,不能满足系统安全运行等问题。本文运用网络计划技术制订工程计划,确保了TRT湿改干项目的顺利实施。包钢大型高炉TRT湿法改干法的成功实践,开创了全国大型高炉干法TRT成功应用的先河,即满足了机组安全稳定运行,保证高炉稳产顺行,又增加了发电量,同时改善了现场职工工作环境,取得了良好的社会效益和经济效益。
[Abstract]:As an important energy recovery device of iron and steel enterprises, blast furnace gas residual pressure generating unit has been widely used in iron and steel enterprises at home and abroad. However, with the improvement of the wet dust removal technology replacing the dry dust removal process in the dust removal system of large blast furnace, the parameters of temperature, pressure and flow rate of the dry dust removal gas have changed greatly under the new dry working conditions. The wet TRT system of the original large blast furnace can not meet the requirements of the new dry working conditions. Combining with the fact that Baotou Iron and Steel Co., Ltd (Baotou Iron and Steel Co., Ltd) took the lead in realizing dry dedusting smelting of large blast furnace above 2000m3 in the whole country, the paper summarizes the successful practice of transforming the raw wet TRT of Baotou Iron & Steel Co., through the research, into the dry TRT. For the same industry TRT wet to dry work to provide lessons for the successful experience. The wet to dry type of large blast furnace TRT can realize the successful transformation of large blast furnace TRT in the shortest time and with as little investment as possible, and then realize the maximization of enterprise benefit. This paper focuses on the main engine system transformation of TRT system, pipeline valve system transformation, automatic control and electrical system transformation and so on. Firstly, the TRT turbine mainframe system is reformed. Through the modification of the material and structure of the rotor, the dynamic and static blades and the bearing cylinder; the modification of the sealing body from the original combed seal to the combed seal with the carbon ring seal; and the revamping of the diffuser, the TRT adapts to the gas temperature in the main engine system, The change of pressure and flow rate solves the problems of TRT rotor thermal expansion, blade wear, dynamic and static blade clearance change, gas permeability restriction, gas leakage and so on under the new working conditions, so that the mainframe system can meet the long-term safety under dry working conditions. Steady operation. Secondly, the TRT pipeline system is reformed. The rectangular corrugated tube compensator is added to the TRT outlet pipeline, and the pressure balance compensator on the original outlet pipe is replaced by the compound bellows compensator. TRT inlet pipe and valve are treated with heat preservation and the system of TRT outlet valve and inlet valve is reformed. The problem of pipe expansion and stress caused by the increase of dry gas temperature in TRT pipeline system is solved, and the overall safe operation requirement of pipeline system is satisfied. Third, through the revamping of the DCS control system of the original wet TRT hydraulic servo control system and the transformation of the TRT power oil system and the TRT power distribution system, the instability, operation and maintenance of the original control system have been solved. As well as the old high and low voltage distribution system equipment aging, small capacity, high failure rate, can not meet the system safe operation and other problems. In this paper, the network planning technology is used to make the project plan, which ensures the smooth implementation of the TRT wet-to-dry project. The successful practice of reforming TRT wet method into dry method of large blast furnace in Baotou Iron and Steel Co., Ltd. Has created the first successful application of large blast furnace dry process TRT in China, which satisfies the safe and stable operation of the unit, ensures the steady production of the blast furnace and increases the power generation. At the same time, the working environment of field workers is improved, and good social and economic benefits are obtained.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X757;TF321.9

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