Patent ID: 11953235
Assignee: DUNHUANG DACHENG SHENGNENG TECHNOLOGY CO., LTD.
Field: Thermal processes and apparatus (Mechanical engineering)
Classification: CPC F  Y | IPC F

Claim 0:
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.