Analysis on Thermoelectric Decoupling Technology Paths for Thermal Power Units Under the Background of Deep Peak-Shaving

doi:10.12096/j.2096-4528.pgt.22117

Abstract

Abstract:

New energy power generation has the characteristics of large fluctuation and instability in output and power generation load. In order to solve the above problems brought by new energy units on the internet, a variety of thermoelectric decoupling modes was used to transform thermal power units,different technology paths were analyzed,and the potential of decoupling thermal power units and peak shifting capacity was explored. EBSILON professional software was used,and the peak load space under different thermoelectric decoupling schemes was evaluated and compared. The results show that the zero output thermoelectric decoupling transformation scheme of low pressure cylinder can improve the peak regulation capacity of the unit to the greatest extent. Under the original maximum heating load of 304.60 MW, the minimum power generation decreased by 172.21 MW, and the minimum power load rate decreased by 32.70%. Thermal power units after heat and power decoupling transformation can significantly improve the coordinated peaking ability of thermoelectric units and new energy units,and improve the stability of the overall power generation of power generation units.

Key words: thermal power units, heat and power cogeneration, thermo-electric decoupling, extraction heating, peak-load regulation

CLC Number:

TM 621

Qiwei ZHENG, Huating WANG, Heng CHEN, Peiyuan PAN, Gang XU. Analysis on Thermoelectric Decoupling Technology Paths for Thermal Power Units Under the Background of Deep Peak-Shaving[J]. Power Generation Technology, 2024, 45(2): 207-215.

Figures/Tables 13

Fig. 1 Diagram of case unit thermal system

Tab. 1 Basic thermodynamic parameters of THA operating condition of the case unit

参数	数值
主蒸汽温度/℃	538.00
主蒸汽压力/MPa	16.67
主蒸汽流量/(t/h)	937.35
再热蒸汽温度/℃	538.00
再热蒸汽压力/MPa	3.32
再热蒸汽流量/(t/h)	783.57
额定背压/kPa	14.00
给水温度/℃	272.20
额定功率/MW	300.00

Fig. 2 Ebsilon model of the case unit

Tab. 2 Model verification results

参数	设计值	计算值	相对误差/%
主蒸汽温度/℃	538.00	538.00	0.00
主蒸汽压力/MPa	16.67	16.67	0.00
主蒸汽流量/(t/h)	937.35	937.35	0.00
再热蒸汽温度/℃	538.00	538.00	0.00
再热蒸汽压力/MPa	3.32	3.32	-0.06
再热蒸汽流量/(t/h)	783.57	782.37	-0.15
额定背压/kPa	14.00	14.00	0.00
给水温度/℃	272.20	272.24	0.02
额定功率/MW	300.00	301.50	0.50
热耗/[kJ/(kW·h)]	8 182.40	8 065.60	-1.43

Fig. 3 Decoupling thermodynamic system diagram of low pressure cylinder zero output

Fig. 4 Diagram of decoupled thermal system for combined steam heating at high back pressure

Fig. 5 Compression heat pump decoupling thermodynamic system diagram

Fig. 6 Comparison between the minimum electric load rate of zero output transformation of low pressure cylinder and the case unit

Fig. 7 Comparison between the minimum electric load rate of the combined steam heating with high back pressure transformation and the case unit

Fig. 8 Comparison of the minimum electric load rate of the decoupling of the compression heat pump with the case unit

Fig. 9 Comparison diagram of maximum extraction heat load increment under different thermoelectric decoupling transformation modes

Fig. 10 Comparison diagram of minimum generation increment under different thermoelectric decoupling transformation schemes

Fig. 11 Comparison diagram of minimum charge rate increment for different thermoelectric decoupling schemes

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