US 11,953,235 B1
Low-heat-loss operation method of line-focusing heat collection system and line-focusing heat collection system
Duowang Fan, Lanzhou (CN); Duojin Fan, Lanzhou (CN); Linggang Kong, Lanzhou (CN); Wenye Qi, Lanzhou (CN); Yulei Fan, Lanzhou (CN); Xiaoming Yao, Lanzhou (CN); Zhiyong Zhang, Lanzhou (CN); Bo Li, Lanzhou (CN); Fujun Zhao, Lanzhou (CN); Zhilin Liu, Lanzhou (CN); Guodong Wang, Lanzhou (CN); Wen Li, Lanzhou (CN); and Chongchong Zhang, Lanzhou (CN)
Assigned to Lanzhou Dacheng Technology Co., Ltd., (CN); and Dunhuang Dacheng Shengneng Technology Co., Ltd., (CN)
Filed by Lanzhou Dacheng Technology Co., Ltd., Lanzhou (CN); and Dunhuang Dacheng Shengneng Technology Co., Ltd., Gansu (CN)
Filed on Aug. 31, 2023, as Appl. No. 18/240,730.
Claims priority of application No. 202211453348.7 (CN), filed on Nov. 21, 2022.
Int. Cl. F24S 40/60 (2018.01); F24S 50/00 (2018.01)
CPC F24S 40/60 (2018.05) [F24S 50/00 (2018.05)] 15 Claims
OG exemplary drawing
 
1. A low-heat-loss operation method of a line-focusing heat collection system, comprising the following steps:
preheating collector tubes in an empty tube state by utilizing solar energy to enable the collector tubes to be in a preheating mode;
after a set preheating temperature of each of the collector tubes is reached, injecting a heat transfer working medium into the collector tubes and starting a circulation of the heat transfer working medium, and when the heat transfer working medium is injected into the collector tubes, converting an injection section of each of the collector tubes into a focusing mode from the preheating mode;
after heat collection of the collector tubes is finished, stopping the circulation of the heat transfer working medium, and keeping the focusing mode of the collector tubes;
draining the heat transfer working medium into a storage tank through the collector tubes, and when the heat transfer working medium is drained, converting an emptying section of each of the collector tubes into a light heat-tracing mode from the focusing mode; wherein the light heat-tracing mode comprises a focusing state and a defocusing state, and a temperature of each of the collector tubes in the light heat-tracing mode is controlled by adjusting the time proportion of the focusing state to the defocusing state; and
after the heat transfer working medium is emptied, stopping the light heat-tracing mode.