Flue gas source heat pump water heating system and method for recycling low-temperature flue gas waste heat

Abstract

The invention discloses a flue gas source heat pump water heating system and a method for recycling low-temperature flue gas waste heat. The flue gas source heat pump water heating system comprises a heat pipe type evaporator, a gas-liquid separator, a compressor, a shell-and-tube cooler, a liquid storage device, a dry filter and a throttle valve. All the components are sequentially connected through stainless steel tubes to form a closed circulating system. The heat pipe type evaporator comprises a heat absorption section flue gas box and a heat release section cylinder, a spiral corrugated fin is additionally arranged outside each heat pipe in the flue gas box so that heat transfer can be strengthened, and the cylinder is adopted in the heat release section so as to improve the resistance to pressure. The shell-and-tube cooler is supported by inner wall micro-fin tubes and spiral fins outside a tube. The method for recycling the flue gas waste heat includes the steps that flue gas enters the heat pipe type evaporator of the heat pump water heating system, heat is transmitted to refrigerating fluid through the heat pipes, and the refrigerating fluid is conveyed into the shell-and-tube cooler for heating running water through the compressor. By the adoption of the flue gas source heat pump water heating system, the low-temperature flue gas waste heat can be recycled directly and efficiently, the heat pipe type evaporator is adopted, and thus refrigerating fluid leakage caused by flue gas corrosion can be avoided.

Description

technical field [0001] The invention relates to a flue gas source heat pump hot water system and a method for recovering and utilizing low-temperature flue gas waste heat, belonging to the field of waste heat recovery and utilization. Background technique [0002] A large amount of high-temperature flue gas is emitted during the operation of gas-fired boilers and kilns. Using tube-fin gas-water heat exchangers to recover flue gas waste heat is a relatively mature technology at present, but due to the limitations of heat transfer temperature difference and waste heat recovery economy , only part of the heat in the high-temperature flue gas can be recovered, so the low-temperature flue gas will be produced after the waste heat is recovered by the gas-water heat exchanger, and the exhaust gas temperature is still around 80°C, and a large amount of low-temperature waste heat is not recycled but discharged directly into the atmosphere, resulting in a huge waste of energy. [000...

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