Optimization of 700℃ Ultra-supercritical Single Reheat Power Generation System

doi:10.12096/j.2096-4528.pgt.21046

Abstract

Abstract:

The superheat degree of steam extraction is high in the ultra-supercritical single reheat unit. It results in largely irreversible loss and poor system perfection. The thermodynamic performance of the MAST CYCLE thermodynamic system was analyzed, which can effectively reduce the superheat of regenerative extraction steam. However, the system is relatively complex. The optimization system of single reheat with 4-stage external coolers is the best scheme of system integration, and the power supply efficiency reaches 49.58%. The waste heat of the system was used. The calculation results show that the power supply efficiency of the system reaches 50.07%, which provides a more effective way for the optimization design of 700℃ ultra-supercritical unit system.

Key words: ultra-supercritical unit, MAST CYCLE thermodynamic system, pressure optimization, waste heat utilization, power supply efficiency

CLC Number:

TK47

Mei YANG, Yunlong ZHOU, Jinfu YANG, Di WANG, Dongjiang HAN, Jiaxin BAO. Optimization of 700℃ Ultra-supercritical Single Reheat Power Generation System[J]. Power Generation Technology, 2021, 42(4): 509-516.

Figures/Tables 13

References 20

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设备	模型及参数
锅炉	飞灰排出的黑箱模型
汽轮机	排汽压力为0.002 2 MPa
凝汽器	循环冷却水入口温度为10 ℃
汽动给水泵	等熵效率为85.30%，机械效率为99.80%
发电机	发电机效率为98.98%

设备	模型及参数
锅炉	飞灰排出的黑箱模型
汽轮机	排汽压力为0.002 2 MPa
凝汽器	循环冷却水入口温度为10 ℃
汽动给水泵	等熵效率为85.30%，机械效率为99.80%
发电机	发电机效率为98.98%

参数	1#	2#	3#	4#	除氧器	6#	7#	8#	9#	10#
上端差	1.7	0	0	0	0	2.8	2.8	2.8	2.8	2.8
下端差	5.6	5.6	5.6	5.6	0	2.6	5.6	—	—	—

参数	1#	2#	3#	4#	除氧器	6#	7#	8#	9#	10#
上端差	1.7	0	0	0	0	2.8	2.8	2.8	2.8	2.8
下端差	5.6	5.6	5.6	5.6	0	2.6	5.6	—	—	—

参数	MC系统	参比系统
发电功率/MW	1 000	1 000
主蒸汽压为/MPa	37.25	37.25
主蒸汽温度/℃	700	700
主蒸汽进汽量/(t/h)	2 396.16	2 295.85
一次再热压力/MPa	7.47	7.47
一次再热温度/℃	720	720
一次再热流量/(t/h)	1 540.35	1 893.42
额定背压/MPa	0.002 2	0.002 2
锅炉给水温度/℃	332.9	332.9
高压缸效率/%	90.5	90.5
中压缸效率/%	93.5	93.5
低压缸效率/%	90.0	90.0
Best-Turbine小汽轮机效率/%	90.5	—
给水泵汽轮机/%		85