【摘要】：近年來隨著環(huán)境資源的日益枯竭、環(huán)境污染問題日益嚴(yán)重以及溫室氣體排放引起的全球氣候變暖等問題備受國際社會廣泛關(guān)注,節(jié)約一次能源也成為了我國的重要國策。我國電源結(jié)構(gòu)中,火電裝機(jī)容量依然占主導(dǎo)地位,火電發(fā)電在能源系統(tǒng)中扮演重要角色,但火電廠同時也是重要的電能消耗大戶,其消耗包括煤耗和廠用電率兩個部分。發(fā)電廠廠用電多由其輔機(jī)消耗,其中電動給水泵的耗電量約占發(fā)電廠廠用電率的20~30%。因此,對電動機(jī)水泵進(jìn)行節(jié)能改造對降低發(fā)電廠廠用電率以及煤耗有重要意義,同時也是降低發(fā)電企業(yè)成本的重要措施。國電懷安熱電有限公司的機(jī)組為2×330MW燃煤直接空冷供熱機(jī)組,給水系統(tǒng)配置3臺50%BMCR容量液力耦合器調(diào)速電動給水泵,正常運(yùn)行方式為兩運(yùn)一備。由于給水泵的耗電量較大,有較大的節(jié)能潛力。本文主要針對國電懷安熱電廠,提出相應(yīng)的給水泵變頻節(jié)能改造策略,并進(jìn)行了以下研究:1)從給水泵的基本特點(diǎn)入手,分析了給水泵調(diào)速技術(shù)的節(jié)能原理,在此基礎(chǔ)上對各種電機(jī)調(diào)速方法進(jìn)行分類,并對其基本原理、應(yīng)用場合、優(yōu)缺點(diǎn)等方面進(jìn)行了分析和論述。通過能量傳遞效率以及技術(shù)性能的比較發(fā)現(xiàn),變頻調(diào)速相比于其他調(diào)速方式具有明顯的節(jié)能優(yōu)勢和技術(shù)經(jīng)濟(jì)優(yōu)勢。2)針對給水泵變頻改造實(shí)際案例進(jìn)行調(diào)研,以已完成變頻改造的馬蓮臺電廠為參考,從變頻改造前后給水泵的耗電量、變頻改造的可靠性、液力耦合器改造、控制系統(tǒng)等方面出發(fā),對懷安熱電廠變頻改造的可行性分析。3)從國電懷安電廠電動給水泵的變頻節(jié)能改造方案入手,分別對變頻裝置的選型、技術(shù)要求、參數(shù)配置等進(jìn)行了詳細(xì)的分析。在此基礎(chǔ)上,結(jié)合懷安電廠#1和#2機(jī)組給水泵的實(shí)際情況,完成了變頻設(shè)備選型、散熱方案選擇、電源及接地方案選擇以及變頻改造的實(shí)施,并測試了各個設(shè)備的功能指標(biāo)完成情況。最后通過變頻改造前后的試驗(yàn)數(shù)據(jù)對比,進(jìn)行了節(jié)能效果分析。
[Abstract]:In recent years, with the increasing depletion of environmental resources, environmental pollution and global warming caused by greenhouse gas emissions have attracted extensive attention of the international community. Saving primary energy has also become an important national policy of our country. Thermal power generation plays an important role in the energy system, but the thermal power plant is also an important consumer of power consumption, which includes coal consumption and auxiliary power consumption. The power consumption of the power plant is mostly consumed by its auxiliary machine, and the electric feedwater pump accounts for about 20% of the power consumption rate of the power plant. Therefore, it is of great significance to reduce the power consumption rate and coal consumption of the electric motor and pump, and is also an important measure to reduce the cost of power generation enterprises. The unit of Huai'an Thermal Power Co., Ltd is 2 脳 330MW coal-fired direct air-cooled heating unit. The feed water system is equipped with three 50%BMCR hydraulic coupler speed regulating electric feedwater pumps. The normal operation mode is two operation and one standby. Due to the large power consumption of the feed pump, there is a great potential for energy saving. Aiming at Huai'an Thermal Power Plant of Guodian Power Plant, this paper puts forward the corresponding retrofit strategy of variable frequency energy saving of feed water pump, and carries out the following research: 1) starting with the basic characteristics of feed pump, analyzes the principle of energy saving of speed regulation technology of feed water pump. On this basis, various motor speed regulation methods are classified, and its basic principle, application situation, advantages and disadvantages are analyzed and discussed. Through the comparison of energy transfer efficiency and technical performance, it is found that frequency conversion speed regulation has obvious advantages of energy saving and technical and economic advantages compared with other speed regulation modes. With the reference of Malintai Power Plant, which has completed the transformation of frequency conversion, from the aspects of power consumption of feed water pump before and after frequency conversion transformation, reliability of frequency conversion transformation, revamping of hydraulic coupler and control system, etc. The feasibility analysis of frequency conversion transformation of Huai'an thermal power plant. 3) starting with the conversion and energy saving reconstruction scheme of electric feed water pump in Huai'an Power Plant, the selection of frequency conversion device, technical requirements and parameter configuration are analyzed in detail. On this basis, combined with the actual situation of feed water pump of #1 and #2 units in Huai'an Power Plant, the selection of frequency conversion equipment, the selection of heat dissipation scheme, the selection of power supply and grounding scheme and the implementation of frequency conversion transformation are completed. The performance of each equipment was tested. Finally, the energy-saving effect is analyzed by comparing the test data before and after the transformation of frequency conversion.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM621

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