Energy-saving corrosion-resistant high-efficiency heat exchange device

Abstract

The invention discloses an energy-saving corrosion-resistant high-efficiency heat exchange device. The energy-saving corrosion-resistant high-efficiency heat exchange device comprises a phase change heat release module, a phase change heat absorption module and a gas-liquid separation tower, wherein the phase change heat release module and the phase change heat absorption module are arranged up and down; the gas-liquid separation tower is arrange between the phase change heat release module and the phase change heat absorption module; an upper gas collecting pipe in the phase change heat absorption module communicates with the lower end of a first ascending pipeline; the upper end of the first ascending pipeline extends upwards into the gas-liquid separation tower and is positioned in theupper space of the gas-liquid separation tower; the top of the gas-liquid separation tower communicates with an upper gas collecting pipe in the phase change heat release module through a second ascending pipeline; an induced draft fan is arranged at a gas inlet of the phase change heat release module; the bottom of a lower liquid collecting pipe in the phase change heat release module communicates with the upper end of a first descending pipeline; the lower end of the first descending pipeline extends into the gas-liquid separation tower and is immersed in liquid working medium in the lower space of the gas-liquid separation tower; and the bottom of the gas-liquid separation tower communicates with a lower liquid collecting pipe in the phase change heat absorption module through a seconddescending pipeline. The energy-saving corrosion-resistant high-efficiency heat exchange device has the advantages of energy saving and corrosion resistance.

Description

technical field [0001] The invention relates to the technical field of energy-saving equipment in industries such as electric power, chemical industry and metallurgy, and in particular to an energy-saving, corrosion-resistant, high-efficiency heat exchange device. Background technique [0002] Boiler exhaust heat loss is one of the main heat losses in power plant boilers. Exhaust heat loss accounts for the largest proportion of all heat losses in famous coal-fired boilers, accounting for more than 75% of the total heat loss of coal-fired boilers. The main factor leading to the heat loss of the exhaust gas is the exhaust gas temperature. Generally, when the temperature of the exhaust gas increases by 10°C, the heat loss of the exhaust gas increases by 0.6%-1%, and the heat consumption increases by 1.2%-2.4%. In addition, too high exhaust gas temperature will not only seriously reduce the utilization rate of energy, but also greatly affect the subsequent desulfurization flue g...

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Problems solved by technology

The condensed water in the thermal system of the steam turbine absorbs the heat of the exhaust gas in the low-temperature economizer, reduces the temperature of the exhaust gas, is heated by itself, raises the temperature, and then returns to the low-pressure heating system of the steam turbine. However, coal, oil, and natural gas are all sulfur-containing fuels. , Combustion will produce sulfur dioxide and sulfur trioxide. Among them, sulfur trioxide and water vapor will produce sulfuric acid vapor under certain temperature conditions. The critical temperature at which this reaction can occur is called acid dew point. The metal wall surface in the boiler tail equipment If the temperature is lower than the condensation point (acid dew point) of sulfuric acid vapor, liquid sulfuric acid (acid dew) will be formed on the surface, which will corrode the metal heat exchange equipment, may cause leakage, and affect the operation safety and service life of the equipment. At the same time, the ash in the flue gas will adhere to the outer wall of the heat exchanger, reducing the thermal efficiency of the heat exchanger.

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