Control method for optimizing solar-to-power efficiency of solar-aided coal-fired power system under off-design working conditions
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Solution Overview
Problem
Conventional solar-aided coal-fired power systems face challenges in maintaining efficient solar energy utilization and operation under off-design working conditions, particularly due to fluctuations in solar irradiance, leading to difficulties in accurately evaluating solar energy effects and ensuring smooth consumption of renewable energy.
Innovation Solution
A control method that establishes a relationship between the solar-coal feedwater flow distribution ratio and solar-to-power efficiency, regulating the flow rate of water entering the solar collecting system to optimize solar-to-power efficiency by calculating specific enthalpies and generation power, and adjusting the solar-coal feedwater flow distribution ratio to maximize efficiency under varying conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional control methods are used that only consider design working conditions, then the system operation is simple, but the solar-to-power efficiency cannot be optimized under off-design working conditions
Solution Approach 1:
The control method dynamically adjusts the solar-coal feedwater flow distribution ratio based on real-time working conditions (solar irradiance, power load, feedwater temperature) rather than using fixed control parameters designed for design conditions only. This dynamic adaptation enables the system to optimize solar-to-power efficiency under varying off-design conditions.
Solution Approach 2:
The invention changes the control parameter from fixed design-value-based settings to variable parameters including solar irradiance intensity, power load, and feedwater temperature. By continuously monitoring and adjusting these parameters, the system optimizes the solar-coal feedwater flow distribution ratio to maximize solar-to-power efficiency under different operating conditions.
2Use of energy by moving object
If the solar-coal feedwater flow distribution ratio is not regulated, then the control system is simple, but solar energy cannot be fully utilized under irradiance fluctuations
Solution Approach 1:
The control method implements a feedback mechanism that continuously monitors solar irradiance, power load, and feedwater temperature, then adjusts the solar-coal feedwater flow distribution ratio accordingly. This closed-loop feedback ensures solar energy is fully utilized under varying irradiance conditions while maintaining automated operation.
Solution Approach 2:
The system automatically regulates the solar-coal feedwater flow distribution ratio based on real-time condition monitoring without requiring manual intervention. The control algorithm self-adjusts to optimize solar energy utilization under different working conditions, making the system self-regulating.
3Productivity
If fixed flow distribution is used, then the system is easy to operate, but the solar-to-power efficiency varies under different power loads and irradiance levels
Solution Approach 1:
The control system transitions from fixed flow distribution to dynamic adjustment of the solar-coal feedwater flow distribution ratio. By adapting to real-time changes in power load and solar irradiance, the system maintains stable and reliable operation while optimizing solar-to-power efficiency across different operating conditions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method effectively optimizes solar-to-power efficiency, improves energy utilization and economic performance of the solar-aided coal-fired power system under off-design conditions by ensuring the solar energy is fully utilized and the system operates efficiently across different load and irradiance levels.
Implementation Method 1
the solar-to-power efficiency means a conversion ratio of solar radiation energy received by the solar-aided coal-fired power system into electricity
Implementation Method 2
the solar-aided coal-fired power system can stably convert solar energy into electricity
Implementation Method 3
calculating a specific enthalpy of mixing water heated by a solar collecting system and high-pressure heaters
Data Source
AI summary
A control method for optimizing a solar-to-power efficiency of a solar-aided coal-fired power system under off-design working conditions is provided. Through reading the relevant information of the solar collecting system, the coal-fired power generation system, the environmental conditions, and the working conditions of the solar-aided coal-fired power system, the water flow rate range able to be heated by the solar collecting unit and the solar-coal feedwater flow distribution ratio range are determined; through establishing the relationship between the solar-to-power efficiency and the solar-coal feedwater flow distribution ratio, the solar-coal feedwater flow distribution ratio is regulated, so that a flow rate of water entering the solar collecting system to be heated is controlled, thereby maximizing the solar-to-power efficiency and improving the economy of the solar-aided coal-fired power system. The present invention provides clear guidance to improve the utilization rate of solar energy and facilitate the consumption of the renewable energy.