Tower-type solar closed under-pressure heat absorption system and method

Abstract

The invention discloses a tower-type solar closed under-pressure heat absorption system which comprises a heat absorber at the high position and a heat exchanger located at the low position. An outlet of the heat absorber is connected with an inlet of the heat exchanger through a pipeline. The tower-type solar closed under-pressure heat absorption system is characterized by further comprising a storage buffer tank located at the low position; a heat absorption medium adding pipe is connected to the storage buffer tank; an air inlet pipe and an exhaust pipe are connected to the storage buffer tank higher than the heat absorption medium adding pipe; the air inlet pipe, the exhaust pipe and the heat absorption medium adding pipe are each provided with a valve; one side of the storage buffer tank is connected with an outlet of the heat exchanger through a pipeline, and the other side of the storage buffer tank is connected with an inlet of a circulating pump through a pipeline; an outlet of the circulating pump is connected with an inlet of the heat absorber through a pipeline; and the heat absorber is connected with a blowoff valve through a pipeline, and the blowoff valve is higher than the heat absorber. The invention further discloses the heat absorption method. The tower-type solar closed under-pressure heat absorption system has the beneficial effects of being low in investment cost and operation cost, good in safe and short in heat absorber starting time and ensures the long-term normal working.

Description

technical field [0001] The invention relates to a heat absorption system and method for tower solar energy. Background technique [0002] The existing tower-type solar heat absorption and heat exchange system includes a heat absorber at a high position, a high-temperature storage tank at a low position, a steam generator, a superheater, a low-temperature storage tank and a circulation pump, which are connected in series to form a circulation loop; , the circulation pump sends the medium from the low-temperature tank to the heat absorber, and then flows into the high-temperature storage tank after absorbing heat. The high-temperature medium then heats the water working medium and generates superheated steam for power generation, and the medium after heat release flows into the low-temperature storage tank. At present, the heat absorption tower of a large-scale tower-type photothermal power station is about 200 meters high, and the heat absorber is installed on the heat absorp...

AI Technical Summary

Problems solved by technology

In actual engineering, firstly, the selection of pumps is difficult to achieve localization, so expensive imported pumps are forced to be used. At the same time, the pump power is large and the power consumption is large, which greatly increases the system investment and operating costs; secondly, the storage tanks are all under normal pressure. When the pump works, the heat transfer medium is delivered to the top heat absorber by the power of the pump, and the potential energy is not only wasted during the fall of the medium after absorbing heat, but also needs to be equipped with a decompression device to avoid overpressure of the storage tank, which increases equipment costs and is safe. The third is that during the operation of the system, due to the unstable sunlight, the heat absorber is in an unstable operation state, and the temperature of the working medium entering the storage tank fluctuates greatly. Accidents such as thermal medium solidification make it difficult to ensure the normal operation of the system; Fourth, all the refrigerants entering the heat absorber are low-temperature working fluids, resulting in a long start-up time for the heat absorber

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