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  本文關(guān)鍵詞： 燃?xì)?蒸汽聯(lián)合循環(huán)機(jī)組 供熱 運(yùn)行 熱電曲線 效率 耗氣量　出處：《天津大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：我國燃?xì)?蒸汽聯(lián)合循環(huán)供熱機(jī)組的應(yīng)用起步較晚,在較多設(shè)計、算法等方面技術(shù)尚未完全掌握,本文針對我國天然氣產(chǎn)量較低,燃?xì)獍l(fā)電成本較高等不利因素,開展了以天津陳塘莊熱電廠煤改氣搬遷工程燃?xì)?蒸汽聯(lián)合循環(huán)機(jī)組作為研究對象,依據(jù)熱平衡圖及機(jī)組熱電曲線計算出采暖季日電負(fù)荷及耗氣量等參數(shù),并以各種工況下日熱負(fù)荷量為依據(jù),分別計算采暖季機(jī)組“二拖一”運(yùn)行模式下,背壓工況及抽凝工況天然氣耗氣量,通過比較對照,對采暖季運(yùn)行方式進(jìn)行熱力學(xué)分析探討,給出了較優(yōu)化的機(jī)組運(yùn)行模式,保證天然氣的優(yōu)質(zhì)利用,使熱電廠供熱效率達(dá)到最高。本工程發(fā)電燃料采用潔凈的天然氣。引進(jìn)國外先進(jìn)的燃?xì)?蒸汽聯(lián)合循環(huán)設(shè)備及自動化控制系統(tǒng)。聯(lián)合循環(huán)機(jī)組毛熱效率達(dá)到58.4%,冬季采暖期達(dá)到87.04%,本工程設(shè)計盡最大可能提高供熱能力。汽輪機(jī)采用“二拖一”背壓機(jī)+SSS離合器的供熱方案,冬季按照背壓機(jī)運(yùn)行,中壓缸的全部排汽用于供熱,非采暖期按照凝汽式運(yùn)行,此種機(jī)組配置沒有低壓缸最小冷卻蒸汽流量的要求,可使汽輪機(jī)供熱量能達(dá)到最大化,本工程在背壓供熱的基礎(chǔ)上采用煙氣熱網(wǎng)水余熱加熱器進(jìn)一步增加供熱量,提高供熱能力�？偟膶ν夤�熱能力不低于1254MW。在保證供熱工況下的熱耗率為4136kJ/kWh。本文經(jīng)過計算分析,在保證采暖季供熱量的基礎(chǔ)上,制定出機(jī)組“一拖一”和“二拖一”運(yùn)行模式下背壓及抽凝工況天然氣耗氣量的“氣耗曲線”,以便于電廠采暖季期間的經(jīng)濟(jì)運(yùn)行,燃?xì)饧瘓F(tuán)的合理調(diào)度,取得較好的預(yù)期效果。
[Abstract]:The application of gas-steam combined cycle heating unit in our country started late, and has not been fully mastered in many aspects, such as design, algorithm and so on. This paper aims at the unfavorable factors such as low natural gas output and high cost of gas power generation in China. Taking the gas-steam combined cycle unit as the research object, the daily power load and gas consumption of the heating season are calculated according to the heat balance diagram and the thermoelectric curve of the unit. On the basis of the daily heat load under various working conditions, the natural gas consumption under the operation mode of "two tugs and one" in the heating season is calculated, and the natural gas consumption under the backpressure condition and the condensing condition is calculated, and the thermodynamic analysis of the operation mode in the heating season is carried out through comparison and comparison. In order to ensure the high quality utilization of natural gas, the operation mode of the unit is optimized. The heating efficiency of the thermal power plant is maximized. Clean natural gas is used as the fuel for power generation in this project. Advanced gas-steam combined cycle equipment and automatic control system are introduced. The gross heat efficiency of the combined cycle unit reaches 58.4and winter. The heating period reaches 87.044.The project is designed to improve the heating capacity to the maximum extent possible. The steam turbine adopts the heating scheme of SSS clutch of "two towing and one" backpressure machine. In winter, all the exhaust steam of the medium pressure cylinder is used for heating, and in the non-heating period, the unit is operated in accordance with the condensed steam type. There is no requirement for the minimum cooling steam flow rate of the low pressure cylinder, and the heat supply of the steam turbine can be maximized. On the basis of backpressure heating, this project adopts waste heat heater of flue gas heating network to further increase heat supply and improve heating capacity. The total external heating capacity is no less than 1254MW. The heat consumption rate is 4136kJ / kWh. the heat consumption rate is 4136kJ / kWh. the heat consumption rate is calculated and analyzed in this paper. On the basis of ensuring heat supply in heating season, the "gas consumption curve" of unit "one tow one" and "two towing one" operation mode and natural gas consumption under condensing condition is worked out, so as to facilitate the economic operation of power plant during heating season. The reasonable dispatch of gas group has achieved good expected effect.
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM611.31

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