The storage of CO₂ in deep unminable coal seams can mitigate greenhouse gas emissions. However, CO₂ storage in deep anthracite coal is complex with some uncertainties in the estimation of CO₂ storage capacity. Based on isothermal adsorption experiments and gas solubility experiments under high temperature and pressure conditions, the total storage capacity of CO₂ in anthracite coal is discussed. The results show that the absolute adsorption amount is over 44 cm³/g at temperatures of 318.15, 335.65, and 353.15 K as well as adsorption equilibrium pressures of 10 MPa. The storage capacity of adsorbed and free gas is 35–70 cm³/g and 5–8 cm³/g, respectively, within a depth range of 1000–2000 m. The soluble gas can be ignored for its low content between 0.22 cm³/g and 0.28 cm³/g with a proportion of less than 1%. The storage capacity of CO₂ may be estimated inaccurately because of the heterogeneity and uncertainty of the macroscopic geological conditions and coal reservoir parameters. Taking the No. 3 coal seam in Zhengzhuang block as an example, the storage priority area was divided into supercritical area and subcritical area with five sub-areas according to storage conditions, and the storage capacity was calculated, showing a relatively good storage potential.

将CO ₂储存在深不可开采的煤层中可以减轻温室气体的排放。然而，深无烟煤中的CO ₂储存非常复杂，在估计CO ₂储存容量方面存在一些不确定性。基于等温吸附实验和高温高压条件下的气体溶解度实验，探讨了无烟煤中CO ₂的总储存容量。结果表明，在318.15、335.65和353.15 K的温度以及10 MPa的吸附平衡压力下，绝对吸附量超过44 cm ³ / g。吸附和游离气体的存储容量分别为35–70 cm ³ / g和5–8 cm ³/ g分别在1000–2000 m的深度范围内。可溶性气体的含量在0.22 cm ³ / g和0.28 cm ³ / g之间的比例小于1％，因此可以忽略不计。由于宏观地质条件和煤储层参数的异质性和不确定性，CO ₂的储存能力可能无法准确估算。以郑庄三号煤层为例，根据储层条件将储层优先区域划分为超临界区和亚临界区，分为五个子区域，计算出储量，具有较好的储藏潜力。