Plate type coupled low-temperature flue gas waste heat recovery device used for air heating

Abstract

The invention discloses a plate type coupled low-temperature flue gas waste heat recovery device used for air heating. The device comprises a waste heat recovery unit, an air heating unit and a connecting pipeline or enabling a phase-change working medium in the waste heat recovery unit and the air heating unit to form a closed circulation loop, wherein the waste heat recovery unit comprises a finned type heat-pipe heat exchanger, a phase-change working medium flow passage is arranged in the finned pipe, and a flue gas flow passage is arranged outside the finned pipe; the air heating unit comprises a plate type steam-air heat exchanger; and a steam-water separation steam pocket is arranged on the connecting pipeline between the waste heat recovery unit and the air heating unit, and a cold water inlet pipe and a steam outlet pipe of the finned type heat-pipe heat exchanger and a steam inlet pipe and a cold water outlet pipe of the plate type steam-air heat exchanger are all communicated with the steam-water separation steam pocket. The waste heat recovery device has compact structure, great effective heat exchange area, high heat exchange efficiency, high working stability and high heat energy recover and utilization rate.

Description

technical field [0001] The invention relates to a flue gas waste heat recovery device, in particular to a flue gas waste heat recovery device for heating air. Background technique [0002] Heat exchanger is one of the most important equipment in industrial production. It is widely used in heating, chemical, petroleum, steel and electric power industries. Heat exchange equipment plays an important role in reducing power consumption, heat consumption and other energy consumption of industrial enterprises in industrial production equipment. With the rapid development of industry, the demand for heat exchangers is increasing, and the heat transfer performance requirements such as heat transfer coefficient, temperature and pressure bearing capacity, and resistance loss are also getting higher and higher. In the process of implementing energy saving in the industrial industry, reducing fuel consumption and reducing greenhouse gas emissions are problems that enterprises need to sol...

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Problems solved by technology

When this heat exchange device is working, the combustion conditions of the boiler directly lead to instantaneous changes in the pressure and temperature in the heat exchanger. Therefore, in order to improve the adaptability of the heat exchanger to pressure and temperature fluctuations, tube heat exchangers are usually used. As the heat exchanger of the condensing unit, due to the limitation of the structure of the tubular heat exchanger itself, the effective heat exchange area of ​​the condensing unit is limited and the volume is large, especially when it is used to heat the air, the heat exchange efficiency is low and the heat energy can be recovered. Unsatisfactory effect

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