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IC693PTM100

IC693PTM100

IC693PTM100

IC693PTM100

在實際的工程應(yīng)用中，采用汽輪機效率（ΔΝ1）和循環(huán)水泵的運行電耗（ΔΝ2）達到最佳經(jīng)濟性運行的實現(xiàn)方法上，很難通過函數(shù)運算和過程控制的方式來達到機組最佳經(jīng)濟效果。通常采用汽輪機在出廠時確定的最佳背壓范圍來作為控制的目標，從而改善機組運行工藝參數(shù)，實現(xiàn)凝汽器壓力隨機組負荷變化，經(jīng)濟性運行。因此，在循環(huán)泵中采用變頻調(diào)速技術(shù)實現(xiàn)最佳控制，就需要提出更新的控制策略，而采用熱力動態(tài)平衡理論，則有助于系統(tǒng)優(yōu)化控制的實現(xiàn)。
3．凝結(jié)水的過冷卻度問題
凝結(jié)水過冷會產(chǎn)生不可逆的汽源損失，是一項影響經(jīng)濟性的小指標。正常運行時，凝汽器過冷度一般為0.5～2℃。凝汽器過冷卻度每升高1℃，熱耗增加0.014%，過高會導致煤耗水平增加。導致凝結(jié)水過冷的因素也很多，其中循環(huán)水的流量及入口溫度對凝結(jié)水的過冷具有明顯影響。需要在系統(tǒng)的調(diào)節(jié)過程中考慮此問題，使得機組綜合經(jīng)濟指標取得最佳。
4．冷卻塔蒸發(fā)水量損失與冬季結(jié)冰問題
火電廠是主要的用水大戶，其中冷卻塔中的冷卻水損失是電廠水資源損失的主要源頭之一。它包括蒸發(fā)損失，風吹損失和排污損失；而占75％以上的蒸發(fā)損失主要與循環(huán)水的流量及冷卻塔出入口溫度端差密切相關(guān)。在北方由于夏冬兩季的溫差較大，所以夏冬季冷卻塔中蒸發(fā)熱量所占的比值也有很大變化；夏季約為100%，而冬季約為50%。蒸發(fā)損失水量及風吹損失水量的計算公式如下：


式中：Ds——循環(huán)水量;
Cs——水的比熱容，常溫下，1kg水每升高1℃需要4.1868kJ/(kg?℃)；
ΔTL——冷卻塔冷卻水出口與進口溫度之差；
——水在tp溫度下的蒸發(fā)潛熱；

INDRAMAT MOD1/1X024-082 USPP MOD11X024082

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INDRAMAT BTM03.1-NA-TA-TA-SA-VA-BA-2EA-FW OPER INT NEW 

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INDRAMAT NFD POWER LINE FILTER NFD02.2-480-016

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EK-1501 INDRAMAT DSC 3.1-50-115V INDICATOR DIRECTORY 
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Indramat TVM2.2-050-220/300-W1 Power Supply #7818

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Rexroth Indramat RME12.2-32-DC024 NEW RME12232DC024

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INDRAMAT MAC092B-0-QD-4-C/095-B-0/W1518L V MOTOR

INDRAMAT FILTER NFD02.1-480-130 NEW NFD021480130

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INDRAMAT RME12.2-16-AC115 

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Rexroth Indramat RMK12.2-IBS-BKL NEW RMK122IBSBKL 

REXROTH INDRAMAT MHD093C-058-PGO-BN SERVO MOTOR

INDRAMAT MOD1/0X023-161 USPP MOD10X023161

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INDRAMAT MAC090A-0-RD-3-D/110-A-0-S001 USPP MAC090A0RD3

INDRAMAT NAM1.2-15 SERVO P/S LINE CONDITIONER***XLNT***

Indramat Rexroth VT-3013 VT-5006 Cards

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