A heat recycling circuit arrangement

By installing a heat exchanger gas separator at the outlet of the cold exchanger and automatically returning the liquid phase through the return liquid pipeline, the problem of gas-liquid two-phase operation of the heat circulation loop device under low load conditions is solved, realizing the safe operation of the compressor and the simplicity of the system, and adapting to the volatility of renewable energy.

CN122403472APending Publication Date: 2026-07-17NANJING GOODCHINA CHEM TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NANJING GOODCHINA CHEM TECH
Filing Date
2026-05-14
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

Under low-load conditions, the PC valve in the existing thermal circulation loop device opens too wide, resulting in a high dew point temperature of the thermal circulation gas. After cooling, a two-phase gas-liquid mixture appears, causing a safety hazard of liquid carryover at the compressor inlet, and increasing system complexity and investment costs.

Method used

A hot circulating gas separator is installed at the outlet of the cold exchanger to separate the gas and liquid phases. The liquid phase is then automatically returned to the ammonia cooler via a return liquid pipeline to prevent it from entering the compressor. At the same time, the opening of the PC valve is adjusted according to the load changes of the ammonia synthesis circuit to maintain system balance.

Benefits of technology

It effectively avoids the safety hazard of liquid carrying into the compressor inlet, simplifies system design, reduces equipment investment and failure points, adapts to the volatility of renewable energy, and achieves system simplicity and safety.

✦ Generated by Eureka AI based on patent content.

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    Figure CN122403472A_ABST
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Abstract

This invention discloses a thermal circulation loop device, belonging to the field of green ammonia synthesis technology. It includes an ammonia synthesis tower, a heat exchanger, a water cooler, a cold exchanger, an ammonia cooler, and a compressor. A thermal circulation gas separator is installed at the outlet of the cold exchanger. The gas phase outlet of the thermal circulation gas separator is connected to the compressor inlet through a thermal circulation gas pipeline and a PC valve to form a thermal circulation loop. The liquid phase outlet automatically flows back to the ammonia cooler via a return liquid pipeline using the level difference. This invention places the thermal circulation loop outlet after the cold exchanger and performs gas-liquid separation by adding a thermal circulation gas separator. This ensures that the dew point temperature of the thermal circulation gas is lower than that of the gas dew point temperature of the water cooler, effectively avoiding the problem of liquid carrying in the compressor under low-load conditions. The separated liquid phase automatically flows back due to the level difference, simplifying the system design.
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