Operation Switching Adjustment Device and Working Method of Heat Exchanger and Circulation Pump in Heat Exchange Station

Abstract

The invention discloses a device and a working method for switching the operation of a heat exchanger and a circulating pump in a heat exchange station. Electric regulating valve of primary water inlet pipe, water temperature sensor of secondary water outlet pipe of heat exchanger, check valve, frequency conversion speed controller of circulating pump, water temperature sensor of water separator, water temperature sensor of water collector, differential pressure sensor of water collector and heat exchanger Solenoid valve of the secondary return pipe; the logarithmic average temperature difference is introduced to quantitatively describe the heat exchange capacity of the heat exchanger, and the logarithmic average temperature difference of the heat exchanger is also used as a criterion when adding or subtracting heat exchangers; the electric control valve opening, cycle Pump frequency, water supply temperature, pressure difference and the time for maintaining these parameters are used as criteria to provide equipment operation switching for heat exchangers and circulation pumps in two typical structures of heat exchange stations: "first in series and then in parallel" and "first in parallel and then in series". The working method can effectively improve the heat supply adjustment range of the heat exchange station.

Description

technical field [0001] The invention relates to district heating technology, in particular to a device and working method for switching and regulating the operation of a heat exchanger and a circulation pump in a heat exchange station. Background technique [0002] The district heating system is the main heating technology for buildings in urban areas in northern my country. Although clean energy such as air energy, geothermal energy, and solar energy are gradually used to generate heat from heat sources, the district heating system in my country is still dominated by fossil fuels, which will cause Greater environmental pollution and operating energy consumption. Among them, improving the control level of the district heating system is a key technology to improve operating efficiency and reduce energy consumption. In the district heating system, the heat exchange station is an important hub connecting the heat source and the building. Through the heat exchange between the hi...

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Problems solved by technology

This means that the number of openings of the internal equipment of the heat exchange station is staged, resulting in a small adjustment range for the heat supply of the heat exchange station

This manual adjustment method cannot dynamically and accurately match the heat supply and heat demand. When the opening of the electric control valve on the primary side of the heat exchanger or the frequency of the circulating pump on the secondary side reach extreme values, the water supply temperature and flow rate still cannot reach the set value. , will lead to excess or insufficient heat supply of the heat exchange station

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