Based on the overall analysis and research on the low-temperature waste heat of a chemical refinery project in a coastal refinery enterprise, combined with the characteristics of the plant process flow, the concept of heat recovery cycle was introduced. Using pinch technology, a series, parallel, and mixed heat exchange network was innovatively constructed globally in different blocks of the refining and chemical industry, utility system and internal units, with water as the heat flow medium. It can save about 450,000 TPY of standard coal and reduce CO₂ emissions by 1.115 MM TPY in normal operating conditions. By optimizing steam balance, adding a heat medium water system, and recovering sensible heat from condensed water, the overall energy-saving benefits of the project are significant, reducing the equivalent of circulating water by about 38 kt/h. This provides a valuable engineering practice for the efficient utilization of low-temperature heat resources in refining enterprises.

border:0px, font-size:14px, font-family:-apple-system, BlinkMacSystemFont, ", vertical-align:baseline, margin:0.859em 0px, color:#060607, background-color:#FFFFFF, "> refining and chemical enterprises, low-temperature waste heat, refining area, chemical industry area, process condensate water, steam balance, heat medium water, overall utilization

通过对某沿海炼化企业的化工型炼油项目低温热整体分析研究，结合装置工艺流程特点，引入回热循环理念，利用夹点技术，在炼油化工、公用系统以及装置内部不同区块，以水为热流媒介，创新性地全局构建串、并、混联换热网络。正常工况下可节约标准煤450 kt/a，减少CO₂排放量1115 kt/a，通过优化蒸汽平衡、增设热媒水系统及凝结水显热回收等措施，项目整体节能效益显著，减少循环水当量约38 kt/h，为炼化企业低温热资源的高效利用提供了可借鉴的工程实践。

border:0px, font-size:14px, font-family:-apple-system, BlinkMacSystemFont, ", vertical-align:baseline, margin:0.859em 0px, color:#060607, background-color:#FFFFFF, "> 炼化企业, 低温热, 炼油区域, 化工区域, 工艺凝结水, 蒸汽平衡, 热媒水, 整体利用