Process information
| Key Data Set Information | |
| Location | CN |
| Geographical representativeness description | The China United Cement Corporation |
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| Use advice for data set | Users should consider this dataset for environmental impact assessments of construction projects specifically involving early strength cement. Care should be taken to apply this data to the correct strength grade (52.5 RMPa), and to note the inclusion of mixed solid waste as a raw material. The data should be used in LCA modeling to represent the NSP cement production technology and its operational parameters including dust removal and denitrification efficiencies. It is also important to reflect the system boundaries which cover the full production lifecycle from raw material and energy production to packaging and waste heat recovery. |
| Technical purpose of product or process | This dataset describes the production of high-strength cement (52.5 RMPa) with alternative constituents replacing 6-20% of traditional materials. The cement is applicable for construction projects requiring early strength cement, with a 3rd day compressive strength greater than 23 MPa and a 28th day strength of 52.5 MPa. It is produced using the New Suspension Preheater (NSP) technology, which is prevalent in the Chinese cement industry, and incorporates mixed solid waste, reducing reliance on natural raw materials. |
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| General comment on data set | Early strength cement where the 3rd day compressive strength is greater than 23 MPa and the 28th day compressive strength is 52.5 MPa. Industrial solid waste that contains silica and flue gas desulfurized (FGD) gypsum is used in cement manufacture instead of clay and gypsum. The main stream of cement production – new suspension preheater (NSP) – is applied in the Chinese cement industry. There are three primary production processes: The pulverized coal and raw material preparation process, including the transfer, grinding, homogenization, and storage of raw materials, and the grinding and storage of coal. In the incineration process, the ground and mixed raw materials are inputted into the preheater and then the calciner and decomposed with 60% coal at 950 ◦C. The limestone decomposes to about 95% in the calciner and 5% in the kiln. The decomposed materials fall into the kiln and are incinerated to clinker with 40% coal at a temperature of over 1400 ◦C. In the finishing process, the cement is produced when the clinker, mineral additions, and gypsum are granulated finely by a grinding mill. The raw materials are suspended and heated by recycled hot air in the preheater. |
| Copyright | No |
| Owner of data set | |
| Quantitative reference | |
| Reference flow(s) | |
| Technological representativeness | |
| Technology description including background system | The main stream of cement production – new suspension preheater (NSP) – is applied in the Chinese cement industry. There are three primary production processes: The pulverized coal and raw material preparation process, including the transfer, grinding, homogenization, and storage of raw materials, and the grinding and storage of coal. In the incineration process, the ground and mixed raw materials are inputted into the preheater and then the calciner and decomposed with 60% coal at 950 ◦C. The limestone decomposes to about 95% in the calciner and 5% in the kiln. The decomposed materials fall into the kiln and are incinerated to clinker with 40% coal at a temperature of over 1400 ◦C. In the finishing process, the cement is produced when the clinker, mineral additions, and gypsum are granulated finely by a grinding mill. The raw materials are suspended and heated by recycled hot air in the preheater (Hasanbeigi et al., 2010). |
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| Mathematical model | |
| Model description | Use 1 ton of cement with 52.5 RMPa strength grade as functional unit (FU).System boundaries involve raw material and energy production, road transport, raw material crushing, clinker production, cement milling and packaging, waste heat energy recovery, direct emissions, on-site flue gas treatment and solid waste reuse in cement plants. |
Modelling and validation
Administrative information
Inputs and Outputs