Process information
| Key Data Set Information | |
| Location | CN |
| Geographical representativeness description | The China United Cement Corporation |
| Name |
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| Use advice for data set | When utilizing this dataset for Life Cycle Assessment (LCA) of cement-related products, ensure the system boundaries include all stages from raw material and energy production to the end-of-life phase. Focus on key processes such as the use of NSP technology, coal consumption, on-site energy recovery, and emission controls. Consider the specific efficiencies noted for energy recovery, dust removal, and denitrification in your impact calculations. Also, acknowledge the reuse of solid wastes and the impact of alternative constituents on environmental performance. This data is accurate for cement plants in China utilizing NSP technology with production scales matching the 5000t/d and 2500t/d figures provided. |
| Technical purpose of product or process | This dataset represents the cement production process, where the cement includes alternative constituents of 6-20% and achieves a compressive strength of 32.5RMPa. The described cement fulfills the requirements for early strength cement with more than 15 MPa compressive strength on the third day. Primarily, this cement type is intended for use in construction applications where early strength gain is critical. The production involves the use of a new suspension preheater (NSP) and the integration of mixed solid wastes, promoting environmental sustainability in the Chinese cement industry. |
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Hierarchy level
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| General comment on data set | Early strength cement where the 3rd day compressive strength is greater than 15 MPa and the 28th day compressive strength is 32.5 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). |
| Flow diagram(s) or picture(s) | |
| Mathematical model | |
| Model description | Use 1 ton of cement with 32.5 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