Device and method for recycling mixed working fluid in water supply heating system

Abstract

The invention discloses a device and a method for recycling mixed working fluid of a water supply heating system. 2 Gas and high-pressure drainage, high-pressure drainage uses pressure difference to flow into the outlet pipe of high-pressure heater to realize drainage recycling, and then use high-pressure CO 2 Gas heating feed water for medium pressure feed water heaters to achieve CO 2 Gas waste heat recovery and utilization; the medium-pressure mixed working fluid after cooling is recovered in the same way as medium-pressure hydrophobic and medium-pressure CO 2 Gas waste heat. The invention includes high, medium and low pressure feed water heaters, gas-liquid separators and auxiliary pipelines, which can realize CO 2 Cascade recovery and utilization of gas waste heat and drainage recycling, thereby reducing the amount of water replenishment in the system and the consumption of mixed working fluid extracted by the steam turbine, and the energy saving effect is obvious.

Description

technical field [0001] The present invention relates to the technical field of power generation equipment, in particular to a device and method for recycling mixed working fluid in a water supply heating system. Background technique [0002] For a long time, the main energy source is coal, and other energy forms are the auxiliary supply mode; the extensive coal utilization method leads to low energy utilization efficiency. The supercritical water-coal gasification power generation technology uses supercritical water as the reaction medium, which can realize the thermal decomposition, gasification and separation and purification of coal in the same volume. After the coal is completely gasified, supercritical water, CO 2 and H 2 Mixed working medium. Separation of hydrogen after coal gasification to obtain supercritical steam and CO 2 The mixed working fluid is then entered into the steam turbine for thermal power conversion to generate electricity. [0003] In order to im...

AI Technical Summary

Problems solved by technology

The device of the present invention can recycle the feedwater heating system to drain water and realize CO 2 The cascade recovery of gas waste heat can reduce the amount of steam extraction and water replenishment of the mixed working medium of the generator set, effectively save production costs, and can solve the existing waste of water resources and CO 2 Technical Problems of Gas Waste Heat

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