Frostless air source cascade heat pump steam generator and operation method thereof

Abstract

The invention discloses a frostless air source heat pump steam generator which comprises a low-temperature-level circulation system, a high-temperature-level circulation system and a water system, an evaporator of the low-temperature-level circulation system is an air source evaporator with a water heat exchange pipeline arranged on the air inlet side, and the low-temperature-level circulation system is connected with the high-temperature-level circulation system through an evaporative condenser. Refrigerant gas of the high-temperature-stage circulating system is evaporated through spraying water outside a heating pipe of the vertical shell and tube heat exchanger to generate water vapor; refrigerant liquid of the low-temperature-stage circulating system and refrigerant liquid of the high-temperature-stage circulating system are subjected to primary throttling and gas-liquid separation firstly, refrigerant gas generated after throttling is used for heating make-up water, and the liquefied refrigerant liquid and separated liquid are throttled again and then enter the corresponding evaporators to absorb heat and evaporate. The air source heat pump and the efficient steam generation heat exchanger are combined, and the problems of frosting and defrosting of the air source evaporator in winter can be effectively solved while it is guaranteed that the steam supply amount is sufficient.

Description

technical field [0001] The invention belongs to the technical field of waste heat recovery, and in particular relates to a frost-free air source cascade heat pump steam generator and an operation method thereof. Background technique [0002] As a common production medium and heat carrier in industrial production, steam is widely used in printing and dyeing, chemical industry and other fields. Necessary measures for enterprises to reduce costs, protect the environment, and improve energy efficiency. At present, enterprises generally use boilers or electric heaters to directly heat water to generate steam, but the use of boilers will emit a large amount of carbon dioxide, which is not in line with my country's green development policy. [0003] Compared with boilers and electric heating, the most prominent advantage of heat pump technology is that it consumes a small amount of electricity, that is, it can convert low-grade heat into high-grade heat, thereby obtaining a large am...

AI Technical Summary

Problems solved by technology

Air source heat pump is a high-energy-efficiency system, but when the system is running in winter, frost will form on the surface of the outdoor heat exchanger. The frost layer not only increases the heat transfer resistance between the heat exchanger and the air, but also makes the air The flow resistance increases and the flow decreases, which reduces the heat supply of the unit, and even causes the unit to fail to work normally; the most commonly used defrosting methods are reverse cycle hot gas defrosting or hot gas bypass defrosting, but these methods will cause the heat pump to intermittently work, and high defrosting energy consumption, it is difficult to apply to the occasions where the ambient temperature is low in winter and the heat pump system needs to work continuously

In addition, when the heat pump is used for steam generation, an efficient steam generation heat exchanger is the key. The traditional method of hot water circulation plus flash evaporator and gas-liquid separator requires a large investment in equipment and is not competitive in the market.

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