炼油厂低温热系统利用潜力快速评价方法研究

Study on fast evaluation technique of low-temperature heat recovery system in refinery

根据炼油厂低温热利用以及装置规模现状,提出了炼油厂循环水一般耗量估算方法和循环水实际修正耗量计算方法,建立了基于复杂系数的低温热潜力评估系数计算法。通过两家炼油厂低温热利用现状的对比分析,两种方法初步满足低温热系统快速评价的要求,与炼油厂低温热实际利用状况一致。低温热潜力评价方法认为,低温热潜力评估系数小于1时,低温热利用较为充分;大于或等于1时,全厂低温热利用较少,低温热利用潜力较大;小于0时,说明采用了有效的装置热联合手段。低温热潜力评价方法能快速有效地评价炼油厂低温热的利用程度,与炼油厂低温热利用现状相符合。

The methods for calculation of general consumption and actual modified consumption of refin- ery cooling water are proposed based upon the utilization of low-temperature heat and unit capacities. The po- tential evaluation factor of low-temperature heat based on complex coefficient is established. Through the anal- ysis of the utilizations of low-temperature heat of two refineries and comparisons, the two methods can prelimi- narily meet the requirements of fast evaluation of low-temperature heat system, which are consistent with the refinery low-temperature heat utilization. The low-temperature heat potential evaluation concludes that, when the low-temperature potential coefficient is lower than 1, the low-temperature heat utilization is good. When it is higher than or equal to 1, the low-temperature heat utilization rate of the plant is low, and there is a great potential for low-temperature heat utilization. When it is lower than 0, it is shown that effective thermal inte- gration processes have been adopted for the process units. With low-temperature heat potential evaluation method, the effective utilization of refinery low-temperature heat can be rapidly evaluated.