[Objective

]

To address the practical challenges in cold northern regions of China

including the growing demand for winter heating

severe pollution from coal combustion

and the performance degradation

efficiency drop and frost formation of air-source heat pumps under low-temperature conditions

this paper proposes a novel compressed gas heating and water-based carbon capture integrated system. [Methods

]

The system increases the pressure of flue gas through multi-stage compression

with the compression heat being utilized in a cascaded manner. The high-grade compression heat is used for residential heating

thereby avoiding the problem of frost formation in low-temperature environments with heat pump heating. Subsequently

the low-grade compression heat is harnessed to preheat the gas before it enters the expander within the expansion module

thus increasing the power output of the expander. In parallel

a t

wo-stage water-based carbon absorption-desorption cycle is adopted to achieve CO

2

enrichment and purification

harnessing the cold climate of northern regions to promote the dissolution of CO

2

into the circulating water

while recovering a portion of the compression work via the expander. To evaluate the system's performance

a simulation model of the proposed system is constructed in Aspen Plus

with the specific energy consumption for CO

2

capture

heating load

CO

2

separation efficiency

and product gas purity designated as the key performance indicators. Based on these criteria

a quantitative performance analysis of the system is then carried out. A sensitivity study is conducted on key parameters such as ambient temperature and absorption pressure. [Results

]

Under the design condition of 10 MW heating supply

the system achieves a CO

2

capture rate of 85.65% and a product gas purity of 99.72%. The specific energy consumption for CO

2

capture is 290.18 kW·h/t and the capture cost amounts to 183.51 yuan/t

representing a reduction of about 25.43% compared with that of the conventional amine-based capture technology. Sensitivity analysis indicates that lower ambient temperature

higher second-stage absorption pressure(≥1 200 kPa)

a moderate second-stage circulating water flow rate(300～500 kg/s)

and a medium-to-high inlet CO

2

concentration(≥15%) are conducive to achieving low-energy and high-efficiency operation of the system. [Conclusion

]

This study proposes an integrated system that combines compressed gas heating

low-temperature water-based carbon capture

and cascaded waste heat utilization

which enables the effective synergistic achievement of the dual goals of heating supply and carbon emission reduction. The system features the advantages of low capture energy consumption

stable heat supply

and strong environmental adaptability

providing a promising technical pathway for clean heating and low-carbon flue gas treatment in col

d northern regions.