1761-L16BWA

1761-L16BWA

1761-L16BWA

1761-L16BWA

1761-L16BWA

清洗冷却管，提高循环效率的主要原理是：通过清洗可以提高冷却管的清洁系数，从而可以提高凝汽器的传热系数。在凝汽器冷却水流量、热负荷不变的情况下，传热系数的提高会降低传热端差，从而降低汽轮机的排气温度和排气压力，提高汽轮机的循环效率。《联系人；欧先生》
《座机：0592-5709825》
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冷却水温升的计算式为：Δt=(h_c-h_wc)/(C_w m) (4)

式中：h_c，h_wc—凝汽器中的蒸汽比焓和凝结水比焓，kJ/kg；

C_w—水的比热,kJ/kg；

m—循环倍率，冷却水流量与进入凝汽器的当量蒸汽量的比值。

在凝汽器冷却水流量、热负荷不变（m不变）的情况下，同时对于高真空下的凝汽器来说，比焓差h_c-h_wc变动范围很小。而C_w是常数，由式（4），冷却水温升不变。

凝汽器冷却部分的传热面积A为凝汽器冷却管管壁的面积，总体传热系数K与清洁系数ξ成正比。凝汽器清洁系数设计值一般为0.85～0.9，正常使用情况下凝汽器的清洁系数为0.6～0.7左右。传热端差计算公式为：

δt=Δt/(e^(KA/(C_w D_w ))-1) (5)式中：D_w—冷却水流量,kg/s；

由式（5）可知，通过清洗冷却管，提高凝汽器清洁系数，总体传热系数K提高，在冷却水温升不变时，端差δt下降。

排汽温度（饱和温度）可以根据式(6)进行计算：t_s=t_w1+∆t+δt (6)

式中：t_s-饱和温度；t_w1-冷却水进口温度。

根据式（4）、（5）、(6)可以看出，在凝汽器冷却水入口温度、流量、热负荷不变的情况下，清洁系数ξ提高，使得端差降低，排气温度降低。

EC-3022 PHILADELPHIA GEAR DRIVE 9HS 440HP

MK-5154 ROMAN WELDING TRASFORMER M.N. T46650SB1KUWX

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WI-32 ECONOMY END FACING MACHINE MODEL FH-27-0 2 1/2" 

MK-267 HP PROGRAMMABLE FLUORESCENCE DETECTOR

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MK-5104 SPOT WELDER WITH RO-MAN 90 KVA TRANSFORMER

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WI-31 ECONOMY END FACING MACHINE MODEL FA-520 WITH HYDR

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MK-1142 SULZER PUMP MODEL: 11-40157-1A6L01?-1912, 900GPM

BI-1002 OLIVER OF ADRIAN VERTICAL GRINDER 

BI-1003 OLIVER OF ADRIAN VERTICAL GRINDER 

EK-1583 PACIFIC SCIENTIFIC SERVO AMPLIFIER LOT OF 8 PCS

EK-1584 PACIFIC SCIENTIFIC SERVO AMPLIFIER LOT OF 14PCS

EK-156 KURT MANUFACTURING KURT CHECK GAGING SYSTEM WIT

PD-105 C&M CORP HMF B2 42909-C-008+F/M?/PTJ61 1000 FT

EK-208 ATLAS CAPCO TENSOR POWER FO

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MK-1156 ACME TRANSFORMER 112.5KVA MODEL: T-1-53315-3

MK-1157 SOGEL TRANSFORMER 112.5KVA MODEL: TD3112H4-216

MK-1158 SOGEL TRANSFORMER 112.5KVA MODEL: TD3112H4-216

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CS-208 SAUNDERS & ASSOCIATES MODEL 4250A TEST CHAMBER

MK-1207 RELIANCE ELECTRIC MAXPAK 3 VS DRIVE 

MK-1176 SOGEL TRANSFORMER MODEL: 75T3H, 75 KVA

MK-5011 WTC-MEDWELD 3000S AC CONTROL M/N: 3003AW/T99004

EC-3705 WILLETT 2300-45 LABELJET 120V

BI-1004 NESLAB COOLFLOW MODEL: HX-500 RECIRCULATOR

EK-1138 CRANE 4021 DEMING PUMP, SIZE 1-1/2 M, DIA 10

GA-102 DESPATCH IND STYLE V-15 OVEN TEMP 500 F 208

EC-3706 WILLETT 2300-45 LABELJET 120V 

EC-3704 WILLETT 2300 LABELJET 120V 

WH-1021 LABELING SYSTEMS INC. 1061 W/ SATO BAR CODE

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BT-4006 K-TRON FEEDER UNIT

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