电锅炉燃气锅炉对花木大棚供暖问题的研究【字数:8807】
目录
引言
引言
1 绪论 3
1.1 提出问题 3
1.2 研究的意义 3
1.3 研究思路 3
2 温室系统建模 3
2.1 国内外建模现状 3
2.2 研究内容 4
2.3 建模内容 5
2.3.1 符号、意义以及单位 5
2.3.2 模型原理 5
2.3.3模型求解 5
3 基于VB编程语言的计算软件 10
4 电锅炉、燃气锅炉的比较讨论 10
4.1 经济、政策层面上的比较 10
4.2 污染方面的讨论 11
4.3 结论 11
致谢 12
参考文献: 12
附录: 13
电锅炉、燃气锅炉对花木大棚供暖问题的研究
Study on the heating of flower and tree greenhouse by electric boiler and gas boiler
Student majoring in Information and Computing Science Name Weibo Ma
Tutor Yangjun Wen
Abstract:In this paper, taking the flower and tree greenhouse in Nanjing in winter as an example, the *景先生毕设|www.jxszl.com +Q: @351916072@
problem of using electricity and natural gas as energy for heating boilers under the condition of meeting the basic heating demand is solved. In this paper, the present situation of coaltoelectricity and coaltogas conversion in China and the principle of heat preservation in flowerandtree greenhouse are described to a certain extent. Based on the theory of dynamic system mechanism model of greenhouse based on energy and material balance, the heat consumption of winter heating in flowerandtree greenhouse is estimated and the power of heating boilers with different energy sources is solved by looking up the relevant modeling materials and referring to the domestic and foreign greenhouse modeling data. Combined with the development of VB programming software, user query interface is developed。The advantages and disadvantages of different boilers are compared from different perspectives of economy and pollution, so as to provide purchasing ideas for boiler consumers and provide reference for promoting and changing energy structure.
Key words: Electric Boiler;Gas Boiler;Greenhouse Modeling;Greenhouse Heating
引言:随着时代进步和人民生活水平也不断提高,现代人对农产品的要求不再局限于温饱,而是转向追求个性化、高质量化,为了更好的满足现代文明发展的需要,农业生产必须打破传统的生产模式。作为一种自古存在的农业设施,温室已成为农业生产必不可少的基础设施。温室全部或部分用采光覆盖材料作为墙壁或者屋顶,有透光性,可将白日的热量一定程度上保持在夜间,能打破温度、土壤的限制,可在冬季种植作物或者为需要特殊培育条件的植物提供生长环境。冬季太阳辐射量较低,而温室大棚又需要定时通风换气,通风时大棚内部温度就会受到外界冷空气影响不断降低,一些反季节栽培的植物的生长对温度有着最低要求,此外一些育种工作对温度要求更高也更精密,仅靠温室围护结构本身的保温能力无法满足,这就要求温室大棚必须配备一些加热设施来维持适宜的温室内部温度[2],比如锅炉等供暖设备。
为应对日益严重的环境污染问题,中国近年来出台了众多政策和方针,大力推进清洁能源的发展和应用。煤炭燃烧是导致雾霾的主要原因之一,针对雾霾治理问题,国家相关部门于2017年9月发布通知,要大力发展清洁能源供热,全国性取消煤炭供热。清洁能源供热是指采用清洁无污染、无排放或排放量很小的能源进行供热,比如天然气、电等。
煤改气是指以煤炭为燃料的传统锅炉更换成以天然气这种清洁能源为主的锅炉。天然气较煤改电相对环保,且价格比电力更为低廉。然而天然气是不可再生资源,我国天然气储量不多,主要依赖进口,“一哄而上”进行“煤改气”无疑会加剧中国天然气供应缺口的扩大,未来会面对天然气供给严重不足的现象,导致多个“煤改气”地区冬季供热无法得到保障。
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