An absorption heat pump unit and a heating system for recovering waste heat from a low-temperature water source

Abstract

The invention discloses an absorption heat pump unit and a heat supply system for recovering waste heat from a low-temperature water source. The absorption heat pump unit (10) includes an evaporator (E), an absorber (A), a generator (G), a condenser (C) and a primary network water pipeline; the evaporator (E), the absorber (A), the generator The condenser (G) and the condenser (C) are sequentially connected through fluid pipelines to form a fluid closed circulation pipeline; the primary network water pipeline is connected to the heat exchange tube inside the absorber (A) to form a primary network water circulation pipeline. The absorption heat pump unit provided by the present invention is provided with a fluid closed circulation pipeline and a primary network water circulation pipeline, through which the fluid closed circulation pipeline heats the primary network water circulation pipeline, and the above absorption heat pump unit can make full use of the low High-grade heat energy saves resources while reducing heating costs and obtaining fresh water.

Description

technical field [0001] The invention relates to the field of heat supply, in particular to an absorption heat pump unit and a heat supply system for recovering waste heat from a low-temperature water source. Background technique [0002] Energy issues have become the focus of worldwide attention. The low-grade thermal energy in ocean water is a renewable energy with huge capacity, which has not been fully developed yet. my country's coastline is more than 30,000 kilometers long, and seawater in most waters is suitable as a cold and heat source for heat pump units, which provides a broad market for seawater source heat pump units, and has also been developed and applied to a certain extent in recent years. Seawater is highly corrosive to metals. In order to reduce the corrosiveness of seawater to heat pump units, the existing seawater source heat pump system is equipped with a detachable titanium plate heat exchanger between the unit and the seawater pumping well, and the sea...

AI Technical Summary

Problems solved by technology

[0003] (1) Titanium plate heat exchangers are expensive, making the cost of heat pump units higher

And the inner surface of the titanium plate heat exchanger is easy to be stuck with marine biological larvae or spores, which will grow into large marine organisms in the titanium plate heat exchanger, resulting in a decrease in the cross-sectional area of ​​the pipe in the titanium plate heat exchanger and reducing the heat exchanger's efficiency. Heat transfer coefficient, leading to failure or damage of seawater source heat pump system

[0004] (2) The surface temperature of seawater in the north in winter is 4-6°C. In order to prevent seawater from freezing in the titanium plate heat exchanger, it is necessary to control the seawater temperature in the titanium plate heat exchanger to not be lower than the freezing temperature of seawater -2°C, then The available temperature difference of seawater is ≤6°C, and the low temperature energy of seawater cannot be fully utilized

If seawater freezes in the titanium plate heat exchanger, it will expand the heat transfer tube of the heat exchanger and cause damage to the waste heat recovery system

[0005] (3) In the existing heating system, the temperature difference between the primary network water supply and the primary network return water is small, resulting in a large water flow for transporting unit heat, resulting in high cost of long-distance heating, so long-distance heating cannot be provided

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