燃煤超细颗粒团聚模拟研究

AGGLOMERATION SIMULATION OF SUB-MICRON PARTICLES DURING COAL COMBUSTION

针对煤燃烧过程中产生的超细颗粒有效控制问题,提出了一种配合中国目前电站除尘方式的新方法,其核心思想就是将一种表面具有较高粘附活性的团聚剂溶液喷入烟气中,使烟气中超细颗粒物团聚成较大颗粒物后能够被电站现有除尘装置所除去。为了证明这种方法的有效性,建立了模拟锅炉烟尘流动的小型团聚实验台并进行实验研究;在此基础上,模拟了团聚剂对超细颗粒物的团聚效果,计算结果表明:烟气流量、烟尘浓度、团聚剂流量和浓度等都是影响超细颗粒物团聚的重要因素;若保证烟气温度降低幅度在10℃以内,且烟气流量和烟尘浓度相同时,适当增加团聚剂的浓度或流量,可使超细颗粒物的团聚效率达到70%,为进一步实验研究提供理论依据。

In allusion to the issue of controlling efficaciously sub-micron particles emissions in coal combustion, a new measure that can cooperate with removing manner of Chinese present power station is put forward and its core idea is that through spraying a high stickiness agglomerating solutions into sub-micron particles in gas are being agglomerated to bigger particles and are removed by removing devices. In order to prove the validity, a minitype agglomeration experimental stove that simulated gas flow is set up and the model about the agglomeration of sub-micron particles is set up. The model result showed that gas flux, soot concentration, solution flux and concentration are the important factors impacting on the agglomeration of sub-micron particles; on the condition of ensuring the gas temperature reducing less than 10°C, that solution concentration and flux are suitably added is to reach 70% agglomeration rate, which proves the way validity and then provides references for farther tests.