Energy-Saving Study on a Green and Low-Carbon Circular Process Coupling CCUS with Melamine Production
CCUS耦合三聚氰胺生产的绿色低碳循环工艺节能研究

摘要

以煤化工园区CCUS-改良低压法三聚氰胺耦合循环系统为研究对象，采用能源审计与（火用）分析手 段划定核算边界，剖析CO2 原料化、荒煤气替代供热、反应尾气闭路循环、绿电协同接入的多重能量耦合机制， 测算系统理论节能量与碳减排潜力，甄别限制系统能效提升的关键因素。分析显示该耦合模式拥有一定的节 能降碳潜力，据此提出工艺-热力-电力协同优化思路，可为同类煤化工CCUS化工利用项目的能效评估提供 工程参考。

Abstract

Taking the CCUS–improved low-pressure melamine coupled circulation system in a coal chemical industrial park as the research object, this paper adopts energy auditing and exergy analysis to define the accounting boundary, analyzes the multiple energy coupling mechanisms of CO2 raw material utilization, raw gas substitution for heat supply, closed-loop circulation of reaction tail gas, and coordinated green power integration, calculates the theoretical energy-saving amount and carbon emission reduction potential of the system, and identifies key factors limiting system energy efficiency improvement. The analysis shows that this coupling mode has certain potential for energy saving and carbon reduction. On this basis, a coordinated process–thermal–power optimization approach is proposed, which can provide engineering reference for energy efficiency evaluation of similar CCUS-based chemical utilization projects in coal chemical industries.