Flue gas driven waste heat recovery type absorption heat pump

Abstract

The invention discloses a flue gas driven waste heat recovery type absorption heat pump. The absorption heat pump is mainly composed of a generator, a condenser, a solution heat exchanger, an absorberand an evaporator, wherein flue gas enters the generator firstly, heat is released when the flue gas is in contact with an inner falling film heat transfer tube in the generator in the flue gas flowing process, and then the flue gas enters the evaporator, is in contact with an inner falling film heat transfer tube in the evaporator, and leaves the absorption heat pump after the heat is released again. According to the absorption heat pump, the flue gas is adopted for driving the absorption heat pump, the flue gas waste heat recovery is realized at the same time, the evaporation temperature ofthe absorption heat pump is low so that the flue gas can be reduced to a lower temperature, and further the energy utilization efficiency of various energy systems generating the flue gas is improved. In addition, the absorption heat pump can reduce the temperature of the flue gas to be below the dew point temperature, so that the water vapor in the flue gas is condensed, the condensation heat ofthe water vapor is recycled, and the generated condensed water can be used for washing and purifying the flue gas, so that the dual effects of saving energy and reducing emission of pollutants are achieved.

Description

technical field [0001] The invention belongs to the technical field of absorption heat pumps, and in particular relates to an absorption heat pump for realizing deep recovery of flue gas waste heat. Background technique [0002] Natural gas, coal and fuel oil are widely used in various industrial and civil occasions. In the field of heating, coal-fired thermal power plants, gas-fired thermal power plants, coal-fired boilers, gas boilers, oil-fired boilers, gas heat pumps, etc. are widely used. However, due to the high exhaust gas temperature and abundant waste heat resources in various flue gases, if the waste heat of these flue gases can be fully recovered, the energy utilization efficiency of the energy system will be significantly improved. At the same time, the flue gas contains more pollutants (dust, SO2, NOx, TSP and CO). It has important application value if it can recover the waste heat of flue gas while reducing pollutant emissions. [0003] At present, the flue g...

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Problems solved by technology

[0006] The absorption heat pump in this patent is driven by natural gas, and the waste heat in the flue gas of the gas boiler is recovered by the flue gas-water heat exchanger and the flue gas condensation heat exchanger, so the absorption heat pump in this patent is not used for recovery The waste heat in the flue gas, and when the waste heat in the flue gas is recovered by the flue gas-water heat exchanger and the flue gas condensation heat exchanger, the exhaust gas temperature is still relatively high, and the water vapor in the flue gas cannot be condensed, so it cannot Fully recover the condensation heat of water vapor in the flue gas, while the exhaust gas contains pollutants such as NOx and SO2

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