WO2019179321A1 - 一种燃煤机组调峰瞬态过程煤耗分析方法 - Google Patents
一种燃煤机组调峰瞬态过程煤耗分析方法 Download PDFInfo
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- 一种燃煤机组调峰瞬态过程煤耗分析方法,其特征在于:将调峰瞬态过程中的给煤速率分为稳态对应负荷下的给煤速率、蓄热差异给煤速率增量和过程控制给煤速率增量,主要包含以下几个步骤:式中:L r-t为机组实时负荷率; 为实时负荷率下的稳态对应给煤速率,kg/s; 为火电机组实时入炉煤速率,kg/s; 为机组实时给煤速率增量,kg/s;下标r-t表示实时值,s表示稳态对应值,s-s表示稳态工况值;式中:ΔB为机组调峰瞬态过程中的总煤耗增量,kg;τ 0是调峰瞬态过程的总时间,s;4)将机组调峰瞬态过程中的总煤耗增量ΔB进一步分为蓄热差异引起的煤耗增量ΔB T和调峰过程控制引起的煤耗增量ΔB p-c;5)计算不同工况下,机组蓄热状态的差异ΔQ t,kJ;其中由于工质质量和 工质焓值变化引起的那部分蓄热差异为ΔQ t,f,kJ;由于金属壁温变化引起的蓄热增量ΔQ t,M,kJ;机组各个部分蓄热计算如下:(a)金属蓄热量机组在不同运行工况下,其受热面金属壁温存在差异,对于编号i的省煤器,在机组负荷率为L时其金属平均壁温分别为T i,M其金属蓄热量为:Q i,M=M i,M·c M·(T i,M-T 0) (4)式中:Q i,M为机组在负荷率为L时,省煤器金属受热面的蓄热量,kJ;T 0是环境温度,℃;M i,M是金属的质量,kg;c M是金属比热容,kJ/(kg·℃);整个机组受热面的蓄热量为:式中:Q t,M为整个机组受热面的蓄热量,kJ;n为设备总数;角标t为total缩写,代表总和;(b)工质蓄热量Q i,f=M i,f·(h i,f-h 0) (6)(c)总蓄热量Q t=Q t,f+Q t,M(8)式中:h 0是环境温度下工质对应的焓值,kJ/kg;h i,f是工质的焓值,kJ/kg;M i,f为不同设备内蓄工质质量,kg;Q i,f是工质的蓄热量,kJ;Q t,f是机组内全部工质的蓄热量,kJ;Q t是机组全部工质和金属受热面的蓄热量,kJ;统计机组30%THA-BMCR工况下,机组负荷率L与机组全部工质和金属受 热面的蓄热量之间的关系,折成函数f 2;进而可得到调峰过程前后,机组的蓄热差异,计算ΔQ t=f 2(L 2)-f 2(L 1) (9)ΔQ B=ΔQ t-ΔM f·h 0 (10)ΔB p-c=ΔB-ΔB T (12)式中:L 1是初始负荷率;L 2是目标负荷率;ΔM f是负荷变化前后工质的质量差异,kg;ΔQ B为不同工况下通过煤量补偿的机组的蓄热差异值,kJ;ΔB T为由于不同工况下的蓄热差异,机组的给煤总增量,kg;ΔB p-c为调峰过程中过程控制带来的给煤总增量,kg。
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