What coal to use to burn lime: Industry hot spots and technical analysis
In the past 10 days, with the tightening of environmental protection policies and the recovery of industrial production, the standard for coal for lime kilns has become a hot topic in the industry. This article combines hot data across the network to structure the best fuel choice for lime firing from the dimensions of coal type, calorific value requirements, environmental protection indicators, etc.
1. Related data of recent hot topics
| Hot search keywords | Search index | Related Regions |
|---|---|---|
| Lime kiln environmentally friendly transformation | 187,000 | Hebei/Shandong/Jiangsu |
| Coal calorific value standard | 123,000 | Shanxi/Inner Mongolia |
| Low-sulfur coal prices | 98,000 | National |
2. Standards for selecting coal from lime burning
According to GB/T 30732-2014 "Technical Conditions for Industrial Lime Coal", the coal used in an ideal lime kiln should meet the following indicators:
| Indicator type | High-quality coal | Qualified coal | Critical value |
|---|---|---|---|
| Fixed carbon content | ≥75% | 65-74% | ＜60% |
| Volatile parts | 8-12% | 13-20% | ＞25% |
| Sulfur | ≤0.5% | 0.6-1.0% | ＞1.2% |
| Care value (kcal/kg) | ≥6500 | 6000-6499 | ＜5500 |
3. Comparison of mainstream coal types
Currently, lime production enterprises mainly use three types of coal, and their characteristics are as follows:
| Coal species | Representative place of origin | Catalytic value range | Sulfur (%) | Ton of lime consumption (kg) |
|---|---|---|---|---|
| anthracite | Shanxi Jincheng | 6300-7000 | 0.3-0.8 | 140-160 |
| Poor coal | Pingdingshan, Henan | 5800-6500 | 0.5-1.2 | 160-180 |
| Coking coal | Kailuan, Hebei | 5500-6000 | 0.8-1.5 | 180-200 |
4. Latest news on environmental protection policies
The "Emission Standards for Air Pollutants in Industrial Furnace Kilns" (GB 9078-2023) implemented from October 2023 puts forward stricter requirements for lime kilns:
1. The sulfur dioxide emission limit is reduced from 200mg/m³ to 150mg/m³
2. The particulate matter emission limit is tightened to 30mg/m³
3. Enterprises in key areas need to install online monitoring systems
5. Expert advice
The Expert Committee of the China Lime Association recently proposed:
• PriorityFixed carbon >70%block anthracite coal
• Sulfur control shouldLess than 0.8%ca88 Asia City
• When the calorific value is insufficientMix 10-15% orchidImprove combustion efficiency
• New project recommendation packageFlue gas desulfurization device
6. Market delivery
| Coal species | Average price per month (yuan/ton) | Changes month-on-month | Main supply location |
|---|---|---|---|
| High-quality anthracite coal | 980-1050 | +3.2% | Shanxi/Guizhou |
| Low sulfur and thin coal | 850-920 | +How many 1.8% | Henan/Shaanxi |
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