Ultra-supercritical straight condensing unit containing fused salt energy storage system and working method of ultra-supercritical straight condensing unit

Abstract

The invention discloses an ultra-supercritical straight condensing unit containing a fused salt energy storage system and a working method of the ultra-supercritical straight condensing unit. The ultra-supercritical straight condensing unit comprises an ultra-supercritical straight condensing unit body and a fused salt heat storage system. The ultra-supercritical straight condensing unit comprises an ultra-supercritical boiler, a high-pressure cylinder, an intermediate-pressure cylinder and a low-pressure cylinder which are connected in sequence; the fused salt heat storage system comprises a fused salt-steam high-temperature heat exchanger and a fused salt-steam low-temperature heat exchanger, and an outlet of the ultra-supercritical boiler and a steam extraction outlet of the high-pressure cylinder are connected with a steam side inlet of the fused salt-steam high-temperature heat exchanger; a steam side outlet of the fused salt-steam high-temperature heat exchanger is connected with an inlet of the medium-pressure cylinder and a steam side inlet of the fused salt-steam low-temperature heat exchanger; a fused salt side inlet and outlet of the fused salt-steam high-temperature heat exchanger is circularly connected with an inlet and outlet of a high-temperature fused salt storage tank, a fused salt side inlet and outlet of the fused salt-steam low-temperature heat exchanger is circularly connected with an inlet and outlet of a low-temperature fused salt storage tank, and heating devices are arranged on the high-temperature fused salt storage tank and the low-temperature fused salt storage tank. And flexible operation of the ultra-supercritical straight condensing unit under the variable load working condition is realized.

Description

technical field [0001] The invention belongs to the fields of conventional power generation technology and molten salt heat storage technology, and relates to an ultra-supercritical pure condensing unit containing a molten salt energy storage system and a working method thereof. Background technique [0002] The flexible operation of coal-fired generator set itself is poor, and there is a hysteresis characteristic of load response. The flexible operation capability of coal-fired units is an effective measure to resolve the conflict between thermal power and renewable energy development. Ultra-supercritical units have the characteristics of high efficiency and environmental protection, and represent the highest level of current coal-fired units. However, ultra-supercritical pure condensing units have poor peak-shaving capabilities, and the response rate of the system under variable loads is slow. SUMMARY OF THE INVENTION [0003] The purpose of the present invention is to ...

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Problems solved by technology

The ultra-supercritical unit has the characteristics of high efficiency and environmental protection, representing the highest level of current coal-fired units, but the peak-shaving ability of the ultra-supercritical pure condensing unit is poor, and the response rate of the system under variable load is slow

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