磷酸二氢铵与碳酸钙抑制煤尘燃烧试验研究

Experimental Study on Coal Dust Burning Suppression with Ammonium Dihydrogen Phosphate and Calcium Carbonate

为了评价煤尘的着火危险性以及保证安全生产,采用Godbert-Green恒温炉测试装置研究粉体分散压力,磷酸二氢铵与碳酸钙惰性介质浓度,粒径对煤尘最低着火温度的影响。试验结果表明:对于粒径45~48μm质量0.3 g的煤尘,分散压力在0.03 MPa时其着火温度最低,温度为584℃。当添加粒径45~50μm磷酸二氢铵、碳酸钙以及碳酸钙与磷酸二氢铵质量比分别为1∶1、1∶2、2∶1的混合粉时煤尘的燃烧得到明显的抑制,其抑制能力顺序依次为磷酸二氢铵>混合粉>碳酸钙。惰性介质粒径为50~250μm、45~50μm、38~45μm、<38μm与煤尘混合燃烧,其最低着火温度随着粒径的减小而增大。

The Godbert- Green furnace test device is used to research minimum ignition temperature of coal dust with ammonium dihydrogen phosphate and calcium carbonate of dispersed pressure, inert medium concentration, particle size effects to evaluate the fire risk of coal dust and guarantee the safety in production. Experimental results are that: when the particle size of 45~48 μm and the quality 0.3 g of coal dust, dispersed pressure is 0.03 MPa, the lowest temperature is 584 ℃. Coal dust combustion have obvious inhibition when adding size 45 to 50 μm ammonium dihydrogen phosphate, calcium carbonate and quality than respectively 1 ∶1, 1 ∶2, 2 ∶1 mixed powder. Its inhibition sequence for ammonium dihydrogen phosphate >calcium carbonate> mixed powder. The particle size of 50~250 μm,45 ~50 μm, 38 ~45 μm, <38 μm of inert medium and coal dust mixed burning, the minimum ignition temperature with the decrease of the particle size increases.