装配式钢结构建筑隐含碳排放计算与分析

Calculation and Analysis of Embodied Carbon Emissions in Prefabricated Steel Structures

针对我国装配式钢结构建筑缺乏基础参数研究的现状问题,以近年天津、河北4个装配式钢结构建筑EPC项目为例,通过工程材料预算、施工组织方案和相关基础参数计算建筑隐含碳排放,重点分析钢结构工程部分的建材及建造(运输+现场施工)碳排放。结果表明,钢结构工程单位建筑面积钢构件隐含碳排放量为234.72~362.68 kgCO_(2)e/m^(2),钢构件运输碳排放量分别在0.04~3.45 kgCO_(2)e/m^(2)之间。现场施工碳排放共32.71 kgCO_(2)e/m^(2),由钢构件吊装、焊接、螺栓固定、防腐和防火处理构成,相应碳排放量分别为0.65 kgCO_(2)e/m^(2)、1.02 kgCO_(2)e/m^(2)、6.75 kgCO_(2)e/m^(2)、3.83 kgCO_(2)e/m^(2)和20.46 kgCO_(2)e/m^(2)。以案例1为例,分析建筑总碳排放构成,表明其建材隐含碳排放占比11.7%~14.6%,建造碳排放占比1.3%~1.6%;单位建筑面积建材隐含碳排放量499.5 kgCO_(2)e/m^(2),其中钢结构构件、楼板、墙体碳排放占比分别为62.6%、15.3%、11.0%。研究为装配式钢结构建筑工程提供隐含碳排放计算的基础参数,并通过建筑碳排放构成分析及我国钢材工业低碳发展前景预测,评估钢结构工程的碳减排潜力。

Driven by the low-carbon development goal,prefabricated steel structures have significant market potential in China,but currently,their application promotion faces problems such as lack of basic parameters in terms of carbon emissions.In response to this problem,the study takes four EPC(Engineering Procurement Construction)projects of prefabricated steel structures in Hebei province and Tianjin,China in recent years as examples,calculates the embodied carbon emissions of the buildings through engineering material budget,construction organization plan and relevant basic parameters of the materials and energy.The key of analysis is the carbon emissions of the building materials and the construction processes including transportation and on-site construction.Results show that,the embodied carbon emission of steel per unit building area is 234.72~362.68 kgCO_(2)e/m^(2),and the carbon emission of steel transportation is between 0.04~3.45 kgCO_(2)e/m^(2).The total carbon emission resulted from the on-site construction is 32.71 kgCO_(2)e/m^(2).It consists of steel components hoisting,welding,bolting,anti-corrosion and fire prevention treatment,of which the corresponding carbon emissions are O.65 kgCO_(2)e/m^(2),1.02 kgCO_(2)e/m^(2),6.75 kgCO_(2)e/m^(2),3.83 kgCO_(2)e/m^(2)and 20.46 kgCO_(2)e/m^(2),respectively.The case 1 is taken as an example to investigate the composition of the total building carbon emissions,and it shows that the embodied carbon emissions of building materials account for 11.7%~14.6%,and the construction carbon emissions account for 1.3%~1.6%;the total embodied carbon emissions of building materials per unit building area is 499.5 kgCO_(2)e/m^(2),of which the carbon emissions of steel structure components,floors and walls account for 62.6%,15.3%and 11.0%,respectively.The study provides basic parameters of calculating embodied carbon emissions for prefabricated steel structure projects,and evaluates the carbon emissions reduction potential of steel structures through the analysis of building carbon emissions and the low-carbon prospects of steel industry.