摘  要：随着社会经济的发展和环保要求的提高，城市在能源结构上发生了巨大的变化。目前大多数城市中使用的燃煤锅炉都是很早之前建立的，随着很多问题的出现，燃煤锅炉已经不能满足了社会的需求了。为改善生存环境、降低城市污染，燃气蒸汽锅炉得到广泛推广。燃气锅炉作为一种产生热能和动力的工艺设备, 广泛地应用于电力、机械、化工、纺织及造纸等工业部门及宾馆、居民区采暖供热等方面。总体看来，燃气锅炉在城市采暖洗浴方面具有广阔的应用和推广空间，是燃煤锅炉的理想替代品。

　　　本文设计的是6t/h的燃气蒸汽锅炉。设计中首先已知锅炉参数，根据设计范围，进行锅炉的燃烧计算。燃烧计算包括理论空气与理论烟气容积的计算，烟气焓温表以及锅炉热平衡及燃料消耗量计算, 计算得出燃料消耗量为477.01m3/h，锅炉效率为89.303%，在燃烧计算的基础上，选取炉胆尺寸，螺纹管束标准。进行锅炉的炉膛和对流受热面由此确定了炉胆类型及尺寸，包括波纹炉胆及平直炉胆，其后确定了其他主要部件的尺寸并进行热力计算。其中主要是对流管束的结构和传热计算。在这些基础上，又进行了对锅炉的炉筒，零件的强度校核计算,提高锅炉运行的安全性。从而得出结论，设计的锅炉是可行的。

关键词：燃气蒸汽锅炉；热力计算；强度校核；节能环保

Abstract: With the improvement of socio-economic development and environmental protection requirements, the city has undergone tremendous changes in the energy structure.Coal-fired boilers which are used in most cities today are established long ago,with the gradual emergence of a lot of problems , Coal-fired boilers can no longer meet the needs of the community. In order to improve the living environment, reduce urban pollution, gas steam boiler has been widely promoted. as the equipment of heat and power process, Gas-fired boilers widely used in industrial sector ,such as electrical, mechanical, chemical, textile and paper industrial sector and hotels, residential heating and heat supply. Generally speaking, gas-fired boilers has broad application and promotion of space in the aspect of the urban heating bath,they are the  ideal substitute for coal-fired boilers.

　　　 This design is about designation and calculation of the 6t/h gas-fired steam boiler .The first step is to calculate the fuel and the cumbustion base on the Boiler parameters and the Design standard., fuel consumption is calculated as 477.01m3 / h, the efficiency of the boiler is 89.303%. The calculation of the fuel and combustion determine the type and size of furnace, including the conical furnace , flat corrugated furnace and furnace. The forth is determining the size of other major components and making thermal calculation.The calculation of the fuel and combustion include calculation of Theoretical air and Theoreticl gas ,the volume of the gas, fuel consumption calculation and thermal balance of the boiler. Select the furnace size, the standard of screw bundle base on the Combustion calculations. And then doing the calculation of the surface and the convection of the heating surface. The heat calculation of convection heating surface include the structure of convection bundle and the thermal calculations.In this basis, the boiler's furnace tube, part of the strength check is calculated to improve the safety of boiler operation. Thus concluded that the design of the boiler is reasonable.

Key words: gas-fired steam boiler; Thermel dynamic calculation; Strength check; Energy conservation and environmental protection