Expansion and water supplement pressure stabilizing system of combined heat and power generation centralized heating heat network and regulation and control method of expansion and water supplement pressure stabilizing system

Abstract

The invention discloses an expansion and water supplement pressure stabilizing system of a combined heat and power generation centralized heating heat network and a regulation and control method of the expansion and water supplement pressure stabilizing system. The problems that a variable frequency pump is large in operating energy consumption and high in damage rate, manual pressure relief workloads are large, and too much circulating water is lost are solved. An expansion constant pressure pipe (10) is connected to a water supplement constant pressure pipe (7) and communicates with a water bag (12) together through an isolation valve (13); the water bag (12) is arranged in an airtight expansion tank (11); the airtight expansion tank is filled with compressed air (14); the compressed air (14) is arranged between an inner cavity of the airtight expansion tank (11) and the outer side wall of the water bag (12) in a filling manner; a compressed air inlet (15) and an electric control pressure exhaust valve (19) are arranged on a tank body of the airtight expansion tank; a compressed air conveying pipe (16) is connected to the compressed air inlet (15); and an air compressor (16) is connected to the other end of the compressed air conveying pipe. Pressure at a constant pressure point is regulated automatically in real time.

Description

technical field [0001] The present invention relates to an expansion, water replenishment and pressure stabilization system for the central heating network of combined heat and power generation, in particular to a system installed in the first heating station of a thermal power plant to provide automatic expansion, pressure stabilization and pressure relief for the heat pipe network of combined heat and power centralized heating Water replenishment system and its regulation method. Background technique [0002] The central heating network for combined heat and power generation is a closed cycle pipe network. The heat source hot water is provided by the steam unit of the thermal power plant. Through the primary pipe network, the heat is transported to each secondary heat exchange station in the city, and returned after heat exchange. Back to the power plant for pressurization and heating. During the operation of the primary pipe network, when the pipe network loses water or ...

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Problems solved by technology

[0004] The invention provides an expansion, water replenishment and pressure stabilization system of a cogeneration central heating network and a control method thereof, which solves the problem of the frequency conversion pump existing in the technical solution of maintaining a constant primary pipe network pressure through a frequency conversion pump and a manual pressure relief valve. High energy consumption during operation, high damage rate, large workload of manual pressure relief and excessive loss of circulating water

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