Process information
| Key Data Set Information | |
| Location | CN |
| Reference year | 2013 |
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| Use advice for data set | When utilizing this data set, users should pay special attention to the system boundary defined as the calcination process of cement clinker. The data is specific to conditions where the phosphogypsum has a mass fraction of 70.68% CaSO4 and is derived from high-sulfur coal with a mass fraction of 2.87% sulfur. The optimal conditions for phosphogypsum decomposition must be observed: reaction temperature of (1000±10)°C, primary air volume of 220m3/h, and a material ratio of phosphogypsum to high-sulfur coal of 10:1. There is no secondary air involved. The data reflects a scenario wherein up to 90.39% of phosphogypsum conversion is achieved with a SO2 volume fraction of 8.18% in the flue gas, suitable for sulfuric acid production, and the cement clinker contains a mass fraction of 65% CaO with a 95% decomposition rate. |
| Technical purpose of product or process | The data set represents a clinker production process using high-sulfur circulating fluidized bed reduction decomposition of phosphogypsum. This process is used to produce SO2, which can be utilized in sulfuric acid production, and to produce cement clinker, which is a principal component in the manufacturing of cement. |
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| General comment on data set | High-sulfur coal is used in circulating fluidized bed technology to reduce phosphogypsum and produce SO2 and cement clinker. The phosphogypsum comes from a certain chemical plant under Yuntianhua Group, with a mass fraction of 70.68% for CaSO4. The high-sulfur coal is selected from a coal mine in Zhenxiong County, Yunnan, with a mass fraction of sulfur of 2.87%.In the pilot study on fluidized bed equipment, the influence of reaction temperature, primary air volume, secondary air volume and phosphogypsum treatment volume on flue gas SO2 concentration was investigated, and the optimal conditions for phosphogypsum decomposition were determined: decomposition furnace reaction temperature (1000 ±10)°C, primary air volume 220m3/h, no secondary air, m (phosphogypsum): m (high sulfur coal) = 10:1. Under these test conditions, the volume fraction of SO2 in the flue gas reaches 8.18%, which can be used for sulfuric acid production, the conversion rate of phosphogypsum reaches 90.39%, the mass fraction of CaO in clinker reaches 65%, and the decomposition rate is 95%. |
| Copyright | No |
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| Technology description including background system | Plan A: High-sulfur coal circulating fluidized bed reduction of phosphogypsum to produce SO2 and cement clinker. Pilot studies on fluidized bed equipment [6,7] investigated the effects of reaction temperature, primary air volume, secondary air volume and phosphogypsum treatment volume on flue gas SO2 concentration, and determined the optimal conditions for phosphogypsum decomposition: decomposition The furnace reaction temperature is (1000±10)°C, the primary air volume is 220 m3/h, there is no secondary air, m (phosphogypsum): m (high sulfur coal) = 10:1. Under this test condition, the volume fraction of SO2 in the flue gas reaches a maximum of 8.18%, which can be used for sulfuric acid production, the phosphogypsum conversion rate reaches 90.39%, the mass fraction of CaO in the clinker reaches 65%, and the decomposition rate is 95% . |
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| Model description | 1kg cement clinker is used as the functional unit; the system boundary is defined as the calcination process of cement clinker, and the specific content includes: input of raw materials → different decomposition and calcination processes → discharge of products and waste gases. |
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