US 12,221,906 B2
System and method for realizing transformation of thermal power unit based on combined high-parameter and low-parameter molten salts
Xiaohui Song, Xi'an (CN); Wei Han, Xi'an (CN); Kangli Fu, Xi'an (CN); Xu Lu, Xi'an (CN); Haimin Ji, Xi'an (CN); Mingyu Yao, Xi'an (CN); Zaisong Yu, Xi'an (CN); and Liang Zhao, Xi'an (CN)
Assigned to Xi'an Thermal Power Research Institute Co., L, Xi'an Shaanxi (CN)
Filed by Xi'an Thermal Power Research Institute Co., Ltd, Xi'an (CN)
Filed on Jul. 11, 2023, as Appl. No. 18/350,306.
Application 18/350,306 is a continuation of application No. PCT/CN2022/102303, filed on Jun. 29, 2022.
Claims priority of application No. 202210278915.3 (CN), filed on Mar. 21, 2022.
Prior Publication US 2024/0035396 A1, Feb. 1, 2024
Int. Cl. F01K 3/18 (2006.01); F01K 3/12 (2006.01); F01K 11/02 (2006.01); F28D 20/00 (2006.01)
CPC F01K 3/186 (2013.01) [F01K 3/12 (2013.01); F01K 3/18 (2013.01); F01K 11/02 (2013.01); F28D 2020/0047 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A system for realizing transformation of a thermal power unit based on combined high-parameter and low-parameter molten salts, comprising a high-parameter molten salt energy storage system, a low-parameter molten salt energy storage system and a thermal power unit,
wherein the high-parameter molten salt energy storage system comprises an electric heater for heating a molten salt, and an electric energy input end of the electric heater is connected with an electric energy output end of the thermal power unit;
the high-parameter molten salt energy storage system comprises a high-parameter molten salt heat absorption loop and a high-parameter molten salt heat release loop, and the low-parameter molten salt energy storage system comprises a low-parameter molten salt heat absorption loop and a low-parameter molten salt heat release loop;
the low-parameter molten salt heat absorption loop comprises a first steam inlet and a first exothermic steam outlet, and the first steam inlet and the first exothermic steam outlet are connected with a hot reheat steam pipeline and an inlet of a deaerator of the thermal power unit, respectively; the high-parameter molten salt heat absorption loop comprises a second steam inlet and a second exothermic steam outlet, the second steam inlet and the second exothermic steam outlet are connected with a main steam pipeline and a cold reheat pipeline of the thermal power unit, respectively; and a regulating valve is arranged between the cold reheat pipeline and the second exothermic steam outlet;
the low-parameter molten salt heat release loop comprises a feed water inlet and a steam outlet, and the feed water inlet is connected with a high-pressure outlet of the thermal power unit; the high-parameter molten salt heat release loop comprises an endothermic steam inlet and an endothermic steam outlet, the endothermic steam inlet is connected with the steam outlet of the low-parameter molten salt energy storage system, and the endothermic steam outlet is connected with a steam inlet of a medium-pressure cylinder of the thermal power unit,
wherein the high-parameter molten salt energy storage system comprises a high-parameter low-temperature salt tank and a high-parameter high-temperature salt tank, and the low-parameter molten salt energy storage system comprises a low-parameter low-temperature salt tank and a low-parameter high-temperature salt tank;
the low-parameter low-temperature salt tank and the low-parameter high-temperature salt tank are in communication with each other, the low-parameter molten salt heat absorption loop and the low-parameter molten salt heat release loop are arranged between the low-parameter low-temperature salt tank and the low-parameter high-temperature salt tank, the high-parameter low-temperature salt tank and the high-parameter high-temperature salt tank are in communication with each other, and the high-parameter molten salt heat absorption loop and the high-parameter molten salt heat release loop are arranged between the high-parameter low-temperature salt tank and the high-parameter high-temperature salt tank;
the high-parameter molten salt heat absorption loop comprises an electric heater and a salt-steam heat exchanger;
an electric energy input end of the electric heater is connected with an electric energy output end of an electric generator in the thermal power unit, a hot-side inlet and a hot-side outlet of the salt-steam heat exchanger are connected with the main steam pipeline and the cold reheat pipeline of the thermal power unit, respectively, a cold-side inlet and a cold-side outlet of the salt-steam heat exchanger are connected with the high-parameter low-temperature salt tank and the electric heater, respectively, and the electric heater is connected with the high-parameter high-temperature salt tank;
the low-parameter molten salt heat absorption loop comprises a high-temperature heat exchanger, a medium-temperature heat exchanger and a low-temperature heat exchanger connected in sequence along a flow direction of the steam, and an exhaust side of the low-temperature heat exchanger is connected to the deaerator of the thermal power unit;
the high-parameter molten salt heat release loop comprises a molten salt superheater, the low-parameter molten salt heat release loop comprises a heat exchanger group, an inlet of the heat exchanger group is connected with the high-pressure outlet of the thermal power unit, an outlet of the heat exchanger group is connected with an inlet of the molten salt superheater, and an outlet of the molten salt superheater is connected with a reheat steam pipeline of the thermal power unit;
a cold-side inlet and a cold-side outlet of the heat exchanger group are connected with the low-parameter low-temperature salt tank and the low-parameter high-temperature salt tank, respectively.