CN-121979301-A - Molten salt flow regulating method and device for tower type photo-thermal power generation system

CN121979301ACN 121979301 ACN121979301 ACN 121979301ACN-121979301-A

Abstract

The disclosure provides a molten salt flow regulating method and device for a tower type photo-thermal power generation system, and relates to the technical field of data processing. The method comprises the steps of constructing a heat output model corresponding to each heat absorption tower based on heliostat state information, inputting illumination intensity prediction data into the heat output model to generate heat input prediction time sequence data of each heat absorption tower in a future target period, obtaining load prediction time sequence data corresponding to a steam-water heat exchange device in the target period, determining predicted heat power required by the steam-water heat exchange device in the target period according to the load prediction time sequence data, determining low-temperature molten salt flow time sequence data of each heat absorption tower based on the predicted heat power and the heat input prediction time sequence data of each heat absorption tower, and adjusting low-temperature molten salt flow entering the heat absorption tower according to the low-temperature molten salt flow time sequence data. According to the scheme, the cooperative adjustment of the low-temperature molten salt flow of the multiple heat absorption towers can be realized, and the response precision and the heat energy utilization efficiency of the photo-thermal power generation system to dynamic loads are improved.

Inventors

ZHOU ZHI
LI CHAO
LI PEIXUAN
ZHANG JUNFENG
ZHANG SHENGLONG
YANG GENBEN
DUAN YANGLONG
HE ZHIBAO
REN YAJUN

Assignees

中国电建集团西北勘测设计研究院有限公司

Dates

Publication Date: 20260505
Application Date: 20251218

Claims (10)

1. The molten salt flow regulating method for the tower type photo-thermal power generation system is characterized by comprising a plurality of heat absorption towers, cold salt storage tanks matched with the heat absorption towers, hot salt storage tanks and steam-water heat exchange devices, and comprises the following steps of: Constructing a heat output model corresponding to each heat absorption tower based on heliostat state information corresponding to the heat absorption tower; acquiring illumination intensity prediction data in a target period, inputting the illumination intensity prediction data into the heat output model, and generating heat input prediction time sequence data of each heat absorption tower in the future in the target period; Acquiring load prediction time sequence data corresponding to the steam-water heat exchange device in the target period, and determining the predicted thermal power required by the steam-water heat exchange device in the target period according to the load prediction time sequence data; And determining low-temperature molten salt flow time sequence data of each heat absorption tower based on the predicted thermal power and the heat input predicted time sequence data of each heat absorption tower, and adjusting the low-temperature molten salt flow entering the heat absorption tower according to the low-temperature molten salt flow time sequence data.
2. The molten salt flow rate adjustment method for a tower type photo-thermal power generation system according to claim 1, further comprising: acquiring the actual thermal power of the steam-water heat exchange device in real time, comparing the actual thermal power with the predicted thermal power, and determining a power deviation value; And adjusting the low-temperature molten salt flow time sequence data according to the molten salt flow deviation value, and optimizing the time sequence data of the low-temperature molten salt flow of each heat absorption tower.
3. The molten salt flow rate adjustment method for a tower type photo-thermal power generation system according to claim 1, wherein the constructing a heat output model corresponding to each heat absorption tower based on heliostat state information corresponding to the heat absorption tower comprises: determining a reflection efficiency correction coefficient based on a cleaning state and a shielding state of a heliostat corresponding to the heat absorption tower; and constructing a heat output model corresponding to each heat absorption tower based on the reflection efficiency correction coefficient, heliostat attitude data and illumination intensity.
4. The molten salt flow rate adjustment method for a tower type photo-thermal power generation system according to claim 1, wherein the acquiring the illumination intensity prediction data in the target period includes: Collecting real-time irradiation time sequence data and weather radar images corresponding to heliostat areas; determining cloud amount change time sequence data corresponding to the heliostat area based on the weather radar image; Inputting the real-time irradiation time sequence data and the cloud cover change time sequence data into an illumination intensity prediction model to obtain the illumination intensity prediction data in a target period; The illumination intensity prediction model is obtained through training based on historical irradiation data corresponding to the heliostat area and cloud quantity change characteristics.
5. The method for adjusting the flow rate of molten salt for a tower type photo-thermal power generation system according to claim 1, wherein the obtaining load prediction time sequence data corresponding to the steam-water heat exchange device in the target period comprises: acquiring historical load time sequence data and historical temperature and humidity data corresponding to a load supply area corresponding to the photo-thermal power generation system; Constructing a load prediction model based on the historical load time sequence data and the historical temperature and humidity data; and inputting real-time load time sequence data and real-time temperature and humidity data corresponding to a load supply area corresponding to the photo-thermal power generation system into the load prediction model to obtain load prediction time sequence data corresponding to the steam-water heat exchange device in the target period.
6. The molten salt flow rate adjustment method for a tower photo-thermal power generation system according to claim 1, wherein the determining low temperature molten salt flow rate timing data for each of the heat absorption towers based on the predicted thermal power and the heat input predicted timing data for each of the heat absorption towers comprises: Determining the maximum heating power of each heat absorption tower in a target period according to the heat input prediction time sequence data of each heat absorption tower; Determining a heat power distribution value of each heat absorption tower in the target period according to the predicted heat power and the maximum heat supply power of each heat absorption tower; And determining low-temperature molten salt flow time sequence data of each heat absorption tower according to the heat power distribution value of each heat absorption tower and the corresponding heat flux model.
7. The molten salt flow rate adjustment method for a tower type photo-thermal power generation system according to claim 1, characterized in that the photo-thermal power generation system further comprises: The standby cold salt storage tank is used for providing low-temperature molten salt for the molten salt electric heater; The inlet end of the molten salt electric heater is connected with the standby cold salt storage tank, the outlet end of the molten salt electric heater is connected with the hot salt storage tank, and the molten salt electric heater is used for heating the low-temperature molten salt to form high-temperature molten salt; And the hot salt storage tank is used for receiving the high-temperature molten salt generated by the heat absorption tower and the molten salt electric heater and conveying the high-temperature molten salt to the steam-water heat exchange device.
8. The molten salt flow rate adjustment method for a tower type photo-thermal power generation system according to claim 7, further comprising: Obtaining the sum of heat input prediction time sequence data of each heat absorption tower in a target period to obtain a heat absorption tower heat supply predicted value; Determining a thermal energy gap value in response to the heat supply predicted value of the heat absorption tower failing to meet the thermal energy demand predicted value required by the load prediction time sequence data; and determining the power of the fused salt electric heater and the low-temperature fused salt flow extracted from the standby cold salt storage tank based on the heat energy gap value.
9. The molten salt flow adjustment method for a tower photo-thermal power generation system of claim 8, wherein the determining the power of the molten salt electric heater and the low temperature molten salt flow extracted from the backup cold salt storage tank based on the thermal energy gap value comprises: Determining change rate data of the thermal energy gap value in a target period; Generating a power boost command in response to the rate of change data being greater than a preset change threshold; Generating a power constant instruction in response to the change rate data not being greater than the preset change threshold; Determining the flow of low-temperature molten salt extracted from the standby cold salt storage tank according to the current power of the molten salt electric heater; the power boosting instruction and the power constant instruction are used for controlling the power of the fused salt electric heater.
10. A molten salt flow rate adjustment device for a tower photo-thermal power generation system for realizing the molten salt flow rate adjustment method for a tower photo-thermal power generation system according to any one of claims 1 to 9, characterized by comprising: The heat output model construction module is used for constructing a heat output model corresponding to each heat absorption tower based on heliostat state information corresponding to the heat absorption tower; The heat input prediction module is used for acquiring illumination intensity prediction data in a target period, inputting the illumination intensity prediction data into the heat output model and generating heat input prediction time sequence data of each heat absorption tower in the future in the target period; The high-temperature molten salt prediction module is used for acquiring load prediction time sequence data corresponding to the steam-water heat exchange device in the target period and determining high-temperature molten salt input flow time sequence data required by the steam-water heat exchange device in the target period according to the load prediction time sequence data; The low-temperature molten salt determining module is used for determining low-temperature molten salt flow time sequence data of each heat absorption tower based on the predicted thermal power and the heat input predicted time sequence data of each heat absorption tower, and adjusting the low-temperature molten salt flow entering the heat absorption tower according to the low-temperature molten salt flow time sequence data.

Description

Molten salt flow regulating method and device for tower type photo-thermal power generation system Technical Field The disclosure relates to the technical field of data processing, in particular to a molten salt flow adjusting method and device for a tower type photo-thermal power generation system. Background In a related tower type photo-thermal power generation system, a cold salt storage tank is generally utilized to convey low-temperature molten salt to each heat absorption tower, and the low-temperature molten salt is fully contacted with solar radiation heat energy reflected and collected by heliostats in the heat absorption towers and absorbs heat, so that the low-temperature molten salt is heated into high-temperature molten salt. The high-temperature molten salt is conveyed to a steam-water heat exchange device through a pipeline system to indirectly heat water, and high-temperature and high-pressure steam is generated to drive a steam turbine generator unit to finish electric energy output. However, in the actual operation process, the related art generally adopts a fixed flow mode to adjust the speed of the low-temperature molten salt entering the heat absorption tower. Under the condition that the sunlight intensity is changed rapidly or the power generation requirement fluctuates, the method is difficult to match the heat energy required by the system in time, and the problems that the power generation is affected due to insufficient heat supply or the energy waste is caused by excessive heat supply are easy to occur. It should be noted that the information disclosed in the above background section is only for enhancing understanding of the background of the present disclosure and thus may include information that does not constitute prior art known to those of ordinary skill in the art. Disclosure of Invention The embodiment of the disclosure aims to provide a molten salt flow regulating method for a tower type photo-thermal power generation system, a molten salt flow regulating device for the tower type photo-thermal power generation system, electronic equipment and a computer readable storage medium, which can accurately match a molten salt distribution strategy according to heat input prediction and load requirements, so that the cooperative regulation of low-temperature molten salt flow of a plurality of heat absorption towers is realized, and the response precision and the heat energy utilization efficiency of the photo-thermal power generation system to dynamic loads are improved. Other features and advantages of the present disclosure will be apparent from the following detailed description, or may be learned in part by the practice of the disclosure. According to a first aspect of an embodiment of the present disclosure, a molten salt flow rate adjustment method for a tower type photo-thermal power generation system is provided, the photo-thermal power generation system includes a plurality of heat absorption towers, cold salt storage tanks, hot salt storage tanks and steam-water heat exchange devices matched with the heat absorption towers, the adjustment method includes constructing a heat output model corresponding to each heat absorption tower based on heliostat state information corresponding to the heat absorption towers, acquiring illumination intensity prediction data in a target period, inputting the illumination intensity prediction data into the heat output model, generating heat input prediction time sequence data of each heat absorption tower in the target period in the future, acquiring load prediction time sequence data corresponding to the steam-water heat exchange devices in the target period, determining predicted heat power required by the steam-water heat exchange devices in the target period according to the load prediction time sequence data, determining low-temperature molten salt flow rate time sequence data of each heat absorption tower based on the predicted heat power and the heat input prediction time sequence data of each heat absorption tower, and adjusting low-temperature molten salt flow rate entering the heat absorption towers according to the low-temperature molten salt flow rate time sequence data. In some example embodiments of the disclosure, based on the foregoing solutions, the molten salt flow adjustment method for a tower type photo-thermal power generation system further includes collecting actual thermal power of the steam-water heat exchange device in real time, comparing the actual thermal power with the predicted thermal power to determine a power deviation value, adjusting the low-temperature molten salt flow time sequence data according to the molten salt flow deviation value, and optimizing the low-temperature molten salt flow time sequence data of each heat absorption tower. In some example embodiments of the disclosure, based on the foregoing scheme, the constructing a thermal output model corresponding to each heat absorption tower b