Solar energy and biomass energy integrated complementary combined thermal power generating system

Abstract

The invention discloses a solar energy and biomass energy integrated complementary combined thermal power generating system, which comprises a biomass circulating fluidized bed combustion boiler system, a solar heat absorption conversion system and a team turbine power generating system, wherein under the condition of the sun radiation, the biomass circulating fluidized bed combustion boiler system and the solar heat absorption conversion system are combined with the steam turbine power generating system to run, so the solar energy radiation heat is converted to the heat energy to be used for heating water, and finally the steam is heated to be the middle-temperature middle-pressure or the high-temperature high-pressure steam so as to drive the steam turbine unit to generate power; and under the condition that no sun radiation exists or the solar heat absorption conversion system has malfunction and is required to be examined, the solar heat absorption conversion system is disconnected, but the biomass circulating fluidized combustion boiler system and the steam turbine power generating system are still maintained to run normally. The solar heat utilization system is reasonably integrated into the biomass power generating system; and moreover, the combined power generating system has the advantages of low investment cost, high power generation efficiency, good system stability and the like.

Description

technical field [0001] The invention relates to a power generation system, in particular to a combined thermal power generation system with low investment cost, high power generation efficiency and good system stability, in which solar energy and biomass energy comprehensively complement each other. Background technique [0002] Energy is an important basis for economic and social development. With the continuous development of the world economy, the demand for energy has grown rapidly, and the massive consumption of fossil energy has led to resource shortages, environmental pollution and climate change, which have seriously affected the living environment and quality of life of human beings. In order to reduce dependence on fossil energy, countries have stepped up efforts to develop and utilize clean new energy and renewable energy. my country also proposes that by 2020, the proportion of non-fossil energy in primary energy consumption will reach about 15%. [0003] Among...

AI Technical Summary

Problems solved by technology

Due to the unstable and discontinuous supply of solar energy, especially at night or when the solar radiation is insufficient, the frequent start-stop and load fluctuation of the system seriously affect the power generation efficiency and unit life of pure solar thermal power generation.

[0004] In order to solve the above problems, the conventional solar thermal power generation system is based on the pure solar thermal power generation system, and is equipped with a fossil fuel supplementary combustion system and an energy storage subsystem. The steam turbine runs continuously, but the high price of fossil fuels increases the power generation cost of the system, and the frequent start and stop of the fossil fuel system and load fluctuations also affect the stable operation of the thermal power generation system; the latter uses heat storage media to temporarily store part of the heat from solar energy Generally speaking, when the solar radiation is insufficient, supplementary energy is provided. However, due to the complexity and high price of the heat storage system, the investment cost of solar thermal power generation is also increased, and there is a certain safety in using molten salt (nitrate) as the heat storage medium. Problem (explosion in case of water)

At the same time, due to the limitation of the efficiency of the solar heat collection temperature, the temperature of the heating medium is generally not high, and the inlet parameters of the steam turbine are low, which leads to the low efficiency of the solar thermal power generation of the whole system

[0005] In summary, conventional solar thermal power generation systems generally have the disadvantages of high investment cost, complex technology, low thermal power generation efficiency, and poor system stability, and it is difficult for this power generation system to effectively solve the above problems through internal technological innovation in the short term. Therefore, it is urgent to seek new ideas, break the conventional solar thermal power generation mode, and develop a new solar thermal power generation system from the perspective of comprehensive complementarity of multiple renewable energy sources

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