连续式秸秆捆烧锅炉设计与供暖工程减排潜力分析

针对连续式捆烧设备在连续进料过程中，秸秆捆连续稳定燃烧性能差、挥发分气体燃烧不充分、秸秆捆难燃尽，而导致热效率低、排放高的问题，该研究基于分级燃烧原理与秸秆捆燃烧特性，在设计计算过程中，对燃烧、换热、配风系统等较为重要设计参数给出了合理的参考值，并通过烟气预热干燥秸秆捆、增加挥发分二次燃尽的三级风、往复炉排增加捆间间隙等方式提高秸秆捆的燃烧性能。设备试制后，利用玉米秸秆捆为燃料开展了热工与排放性能试验。试验结果表明，连续式秸秆捆烧锅炉的平均热效率为80.37%，颗粒物、NOx、SO2平均排放质量浓度分别为48、197、7 mg/m3，环保与能效指标均符合设计要求与国家标准。并对建立的采暖示范工程进行排放、污染物等测算，结果表明采用秸秆捆烧供暖单位面积可减少标煤使用量23.1 kg/m2，CO2当量排放量58 kg/m2。该研究能为秸秆能源化利用与北方清洁区域供暖提供技术支撑，助力农业农村领域碳达峰、碳中和的目标实现。

Design of continuous baled straw combustion equipment and analysis of emission reduction potential in a demonstration project

Abstract: Grassland is an important vegetation type in Xinjiang of western China, particularly on the coordinated development of ecological protection and animal husbandry. It is of great significance to rapidly and accurately evaluate the productivity of regional grasslands, thereby revealing the carrying capacity of herbivores in the warm season of high-altitude grasslands, especially for the balanced management of regional grasslands and herbivorous livestock. However, there are only a few reports on the temporal and spatial changes of grassland Aboveground Biomass (AGB) in high-altitude regions using long-term series. It is necessary to effectively evaluate the carrying capacity considering some limiting factors. Taking the Hejing County of Xinjiang as the research area, this study aims to explore the spatiotemporal dynamics and carrying capacity of the grassland AGB using MODIS 17A3H/NPP (Net Primary Productivity, NPP) data products. An estimation model was also proposed to improve the traditional field sampling, in terms of data availability, multi-year monitoring continuity, and regional coverage. The natural and management factors were considered to further modify the model, according to the grassland type, landform, and township. The results showed that: 1) The Aboveground Net Primary Productivity (ANPP) of grassland presented a Root Mean Square Error (RMSE) value of 3.23-11.89 g/m2, indicating a higher accuracy. 2) The AGB average value was 1 252.34 kg/ hm2 during the study period (2000-2018), indicating a fluctuating upward trend. Specifically, the linear growth rate was 7.78 kg/(hm2·a) (P<0.01), and the overall AGB of grassland was a slight upward trend, where the proportion of grassland with the AGB growth reached 74.90%. The degradation was distributed mostly in the areas with a slope of more than 30%. 3) The annual average aboveground hay was 150 100 t. Among them, the alpine grassland and meadow over 2 500 m produced the largest hay, accounting for 24.20% and 57.46%, respectively. The available hay was reduced to 86 200 t after revision. 4) The average theoretical carrying capacity of grassland in the study area was 242 600 to 319 400 heads. The theoretical carrying capacity of standard sheep without considering natural and management factors was 319 400 heads, the underload of grassland is 2.99%; after revised the carrying capacity was 242 600 heads, and the grass was overloaded by 27.82%, it further illustrated that there was a certain overload risk in the development of grassland animal husbandry in the study area. The research results could provide references for the formulation of regional land management and animal husbandry planning policies, and played a positive role in promoting the sustainable economic development of regional natural resources. The average theoretical carrying capacity of grassland was 242 600 to 319 400 heads. The theoretical carrying capacity of standard sheep was 319 400 heads without considering the natural and management factors, where the underload of grassland was 2.99%. After that, the carrying capacity was 242 600 heads, and the grass was overloaded by 27.82%. Consequently, there was a certain overload risk in the development of grassland and animal husbandry in the study area. The findings can provide a strong reference for the decision-making on the land and animal husbandry, thereby promoting the sustainable development of regional natural resources.