An improved heating network drainage system for a supercritical unit and its working method

Abstract

The invention discloses an improved heat network drainage system of a supercritical unit and a working method thereof, belonging to the technical field of cogeneration of heat and power. At present, there is no reasonable design system that can effectively reduce the drain temperature of the heating network and protect the condensate polishing device when the low-pressure cylinder is removed from the supercritical unit. The system of the present invention includes a heat network heater, a heat network hydrophobic main pipe, a hydrophobic heat exchanger, a hot well, a condensate pump, a condensate polishing device and an absorption heat pump, and the drain outlet of the heat network heater passes through the heat network hydrophobic main pipe and The drain inlet of the drain heat exchanger is connected, the waste water outlet of the absorption heat pump is connected to the cooling water inlet of the drain heat exchanger, the drain outlet of the drain heat exchanger is connected to the inlet of the heat well, the outlet of the heat well is connected to the condensate pump Inlet connection, the outlet of the condensate pump is connected to the inlet of the condensate polishing device. The energy utilization efficiency of this system is high, and it can well solve the problem of high drainage temperature of the heating network after the supercritical unit is retrofitted with a new type of condensing and pumping back.

Description

technical field [0001] The invention relates to an improved heating network drainage system of a supercritical unit, which is a system capable of rationally optimizing the drainage process of the heating network and protecting a condensate polishing device, and belongs to the technical field of cogeneration of heat and power. Background technique [0002] Compared with traditional subcritical thermal power units, supercritical thermal power units have higher thermal efficiency, so they have significant energy-saving and environmental protection significance. Most of the newly built large and medium-sized thermal power units in China are of this type. The supercritical unit has no steam drum, and the heating and evaporation of the feed water to the superheated steam is completed continuously at one time. It lacks the timing and continuous sewage discharge functions of the steam drum boiler, so the requirements for the water quality of the feed water are much stricter. Then in...

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Problems solved by technology

The invention has high energy utilization efficiency and good economic benefits, and can well solve the problem of excessively high drainage temperature of the heating network after the supercritical unit is retrofitted with a new type of condensing and pumping back

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