【摘要】：近年來,隨著環(huán)保指標的日趨嚴苛,如何降低燃料成本、提升機組效率,成為新的研究重點�？蒲泄ぷ魅藛T將目光集中在煙氣排煙熱量上,想要將這部分熱量進行再利用,因此,煙氣余熱利用裝置應(yīng)運而生。本文了介紹了這項新技術(shù),并以盤山電廠#3機組改造為例,對加裝煙氣余熱利用裝置后,機組發(fā)電煤耗、脫硫系統(tǒng)水耗兩個方面進行經(jīng)濟分析和比較。首先,運用蘇聯(lián)1973年鍋爐熱力計算標準方法中推薦的公式,計算出煙氣露點,明確了此溫度遠低于120℃的鍋爐排煙溫度這一重要依據(jù),為煙氣余熱利用裝置提供理論上的可行性,同時對工業(yè)中廣為應(yīng)用的金屬材料進行比較和分析,找到適用于本次改造的原材料。其次,闡述了煙氣余熱利用的基本原理、設(shè)計方案以及相關(guān)基本參數(shù)的選擇原則與經(jīng)濟性分析。按照設(shè)計條件,對煙氣余熱利用裝置布置方式的選取、水側(cè)入口取水方式和溫度的選取、氣側(cè)煙氣溫降的選取、以及裝置內(nèi)管排的布置方式等,都進行了詳細的說明。最后,依托盤山電廠#3機組,根據(jù)等效焓降法原理,結(jié)合汽輪機廠熱平衡圖,建模分析,計算出煙氣余熱利用裝置在額定工況下節(jié)約發(fā)電煤耗可以達到1.60g/kwh。同時,考慮到由于換熱作用,使脫硫吸收塔入口溫度降低,減少了脫硫塔水分蒸發(fā),降低了煙氣的攜水能力,降低了脫硫系統(tǒng)水耗在,最終比較得出在500MW負荷工況下,脫硫系統(tǒng)理論節(jié)水量達到峰值,為33.95t/h。
[Abstract]:In recent years, with the increasingly harsh environmental indicators, how to reduce the fuel cost and improve the efficiency of the unit has become a new research focus. The researchers focus on the heat of smoke exhaust and want to reuse this part of heat. Therefore, the waste heat utilization of flue gas has come into being. The transformation of #3 unit in mountain power plant is an example of economic analysis and comparison of two aspects of the power generation coal consumption and the water consumption of desulphurization system after adding the waste heat utilization device of the flue gas. First, the flue gas dew point is calculated by using the formula recommended in the Soviet Union's 1973 boiler thermodynamic calculation standard method, and the flue gas exhaust temperature far below 120 centigrade is clearly defined. It is an important basis to provide theoretical feasibility for the waste heat utilization device of flue gas. At the same time, it compares and analyses the widely used metal materials in industry, and finds the raw material suitable for this transformation. Secondly, the basic principle of the waste heat utilization of flue gas, the design scheme and the selection principle of the related basic parameters and the economic analysis are discussed. According to the design conditions, the selection of the exhaust heat utilization device, the selection of water intake mode and temperature, the selection of gas temperature drop in the gas side, and the arrangement mode of the pipe row are described in detail. Finally, relying on the principle of the equivalent enthalpy drop method based on the principle of the equivalent enthalpy drop, the #3 unit of Panshan Power Plant is combined with the heat balance chart of the steam turbine factory. The model analysis shows that the power generation coal consumption can be saved at the same time of 1.60g/kwh. at the rated working condition. Considering the heat transfer effect, the inlet temperature of the desulfurization absorber tower is reduced, the water evaporation of the desulfurizer tower is reduced, the water carrying capacity of the flue gas is reduced and the water consumption of the desulfurization system is reduced, and the final comparison is in the 500MW negative. Under the load condition, the theoretical water saving amount of desulphurization system reaches a peak value of 33.95t/h.
【學(xué)位授予單位】：華北電力大學(xué)(北京)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM621;TK115

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