利用小型化模拟炉膛开展了零碳燃料氢气对燃气锅炉燃烧过程调控作用实验研究，研究了掺氢比对炉膛内部预混火焰宏观形态、炉膛温度均匀性、炉膛污染物排放规律的影响，并总结了CO及NOx的排放规律。实验结果表明：随着预混当量比增加，纯甲烷火焰长度逐渐缩短；对于20%掺氢火焰，随着预混程度的提高，火焰长度降低明显；不同火焰条件下，炉膛温度只由燃烧功率控制；改变燃烧条件时，处于壁面附近位置的温度变化较为平稳，而靠近火焰处温度变化较大；天然气中掺入氢气，燃烧时可以有效降低未燃CO排放；在相同预混程度下，全局当量比减小导致未燃空气增加，热量被稀释，火焰温度降低，热力型NOx的生成降低；随着掺氢比的增加，燃烧时火焰温度升高，导致热力型NOx排放增加

In this paper, a miniaturized simulated furnace was used to carry out an experimental study on the regulation effect of zerocarbon fuel hydrogen on the combustion process of gasfired boilers. The influence law of hydrogen mixing ratio on the macroscopic shape of premixed flame in the furnace, the uniformity of temperature in the furnace, the emission of pollutants in the furnace was studied, and the emission rule of CO and NOx was summarized. The experimental results show that the flame length of pure methane decreases gradually with the increase of premixed equivalence ratio; for the 20% hydrogen mixed flame, the flame length decreases more obviously with the increase of premixed degree; under different flame conditions, the furnace temperature is only controlled by the combustion power; when the combustion conditions are changed, the temperature near the wall changes more smoothly, while the temperature near the flame changes more greatly; the combustion of natural gas with hydrogen can effectively reduce the emission of unburned CO; under the same premixed degree, the decrease of global equivalence ratio leads to the increase of air that does not participate in the reaction, the heat is diluted, the temperature of the flame is reduced, and the generation of thermal type NOx is reduced; with the increase of hydrogen mixing ratio, the emission amount of thermal type NOx produced by flame temperature rise also gradually increases.

TK221

国家自然科学基金面上项目（52176130）；新疆维吾尔自治区质监局科技计划项目资助（2018-06）