A black water heat recovery device

By adding a process pipeline to the black water pipe at the bottom of the high-pressure flash tank and connecting it to the high-pressure carbon dioxide heat exchanger, the waste heat of the black water is used to heat the high-pressure carbon dioxide, which solves the problem of increased power consumption caused by large pressure fluctuations in the vacuum pump and achieves efficient recovery of waste heat from the black water and stable operation of the equipment.

CN224381485UActive Publication Date: 2026-06-19SHANDONG MINGQUAN NEW MATERIAL TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
SHANDONG MINGQUAN NEW MATERIAL TECH CO LTD
Filing Date
2025-07-01
Publication Date
2026-06-19

AI Technical Summary

⚠Technical Problem

In existing technologies, the pressure fluctuations of the vacuum pump during the waste heat recovery process of black water from gasifiers are large, leading to increased power consumption and uneconomical operation.

⚗Method used

Add a process pipeline to the black water pipeline at the bottom of the high-pressure flash tank, and connect it to the shell side of the high-pressure carbon dioxide heat exchanger for heat exchange. Use the waste heat of the black water to heat the high-pressure carbon dioxide, replace the low-pressure steam, reduce the heat load of low-pressure flash evaporation and vacuum flash evaporation, and reduce the use of vacuum pumps.

🎯Benefits of technology

It achieves effective recovery of waste heat from black water, saves steam consumption, reduces production costs, improves system safety and stability, has online cleaning function, and extends equipment operating cycle.

✦ Generated by Eureka AI based on patent content.

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Abstract

This utility model provides a blackwater waste heat recovery device, belonging to the field of chemical technology. Specifically, the blackwater from the gasifier is flashed sequentially through a high-pressure flash tank, a low-pressure flash tank, and a vacuum flash tank before finally reaching a sedimentation tank. An additional process pipeline is added upstream of the blackwater regulating valve at the bottom of the high-pressure flash tank. This process pipeline is connected in parallel to the shell side of a high-pressure carbon dioxide heat exchanger, where it exchanges heat with the tube side of the high-pressure carbon dioxide heat exchanger. After heat exchange, the temperature is increased and the blackwater is delivered to users. The blackwater from the high-pressure flash tank is cooled after heat exchange in the high-pressure CO2 heat exchanger. The flow rate to the low-pressure flash tank is controlled by adjusting the downstream blackwater flow regulating valve, indirectly reducing the heat load of the low-pressure flash tank. The flow rate to the vacuum flash tank is controlled by the downstream blackwater regulating valve, further reducing the heat load of the vacuum flash tank. The vacuum pump of the vacuum flash tank is reduced or shut down based on the vacuum flash pressure, achieving energy savings. The waste heat from the high-pressure flash blackwater replaces low-pressure steam, indirectly reducing the vacuum flash load.
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