过程 信息
| 关键数据集信息 | |
| 位置 | SD-CN |
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| 数据集使用建议 | 用户应注意，电石渣生产和预干燥工艺基于特定的水分含量目标和能量需求。在记录生命周期评价数据时，至关重要的是要适当地对来自电石水解的两种产品——电石渣和乙炔的环境影响进行核算。确保预干燥工艺或预热器级别的任何调整都反映在环境负荷和能耗调整中。根据特定地区或提供的数据对运输距离进行建模。生命周期清单数据源应得到承认并一致应用于比较评估。 |
| 产品或过程的技术目的 | 电石渣被用作生产水泥熟料的石灰石替代品，水泥熟料是生产混凝土和其他基于水泥的产品的核心成分。工业流程包括使用燃煤或窑尾废热的方法对电石渣进行预干燥，以达到水泥生产所需的水分含量。 |
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| 关于数据集的一般性意见 | 电石渣是化工行业从电石中产生乙炔的副产品，其主要化学成分是钙水合物。在运往水泥行业之前，从乙炔发生器产生的电石渣的含水量约为35%。然而，它仍无法满足水泥生产的要求，因此需要进一步预干燥，以确保电石渣的含水量降至15%。煤炭预干燥工艺。许多水泥行业在生产水泥熟料时使用5级预热器，炉尾废气温度约为320°C。他们使用带煤炉的旋转干燥机来预干燥电石渣，即在电石渣的含水量约为35%时，将煤炭燃烧产生的气体与电石渣表面接触，交换热量，直至含水量降至15%。 |
| 版权 | 不 |
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| 技术说明，包括后台系统 | Calcium carbide sludge is the co-product of acetylene generation from carbide in chemical industry, whose main chemical composition is calcium hydrate [2]. Before it is transported to cement industry, the moisture content of calcium carbide sludge produced from the acetylene generator is about 35%. However, it still can’ t meet the requirement of cement production; therefore, it needs further pre-drying to make sure the moisture content of calcium carbide sludge reduce to 15% [3]. There are two pre-drying processes currently.Coal-fired pre-drying process. Many cement industries use 5-stage pre-heater when they produce cement clinker, and the temperature of kiln tail waste gas is about 320 °C. They use rotary dryer with a coal stove to pre-dry calcium carbide sludge, i.e., after calcium carbide sludge with the moisture content about 35% entering rotary dryer, the gas from coal combustion will contact with the surface of calcium carbide sludge, exchange heat until the moisture content becomes 15%. Pre-drying process by waste heat from kiln tail. There is a process which is using cement kiln tail waste gas to pre-dry calcium carbide sludge to save coal consumed in this stage. One cement industry from Shandong consumes 1.2t calcium carbide sludge whose moisture content is 35% when produces 1t cement clinker. If calcium carbide sludge is pre-dried to 15%, it needs the temperature of gas from kiln tail about 700°C. Therefore, it can change the pre-heater from 5-stage to 2-stage so that make sure it has enough gas to pre-dry. However, with the decline of pre-heater stage, the clinker heat consumption will increase 1100KJ/kg, and the electricity reduced by 30%. |
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| 数学模型 | |
| 建模说明 | 该功能单元的设置为1吨抗压强度高达42.5MPa的水泥熟料。水泥熟料生产的生命周期可以分为六个阶段：采矿、运输、能源生产、生产电石渣、处理电石渣和生产水泥熟料。 |
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