摘要

    燃气锅炉是利用燃气产生的热能，来把谁加热成为热水或蒸汽的机械设备。锅炉包括锅和炉两部分。燃气锅炉相对于传统的燃煤锅炉而言，不仅产生得到热值高，而且污染气体排放很少，对燃料的利用率也比燃煤锅炉高很多。

　　　锅炉中产生的热水或蒸汽可直接为生活提供所需要的热能，也可以通过蒸汽动力装置转换为机械能，或再通过发电机将机械能转换为电能。产生蒸汽的锅炉称为蒸汽锅炉，产生热水的锅炉称为热水锅炉。

　　　本次设计为2.8MW锅壳卧式燃气热水锅炉的设计计算，首先依据天然气组分进行燃料计算，并由计算结果制作烟气温焓表。然后进行热平衡计算，炉膛热力计算和对流传热计算，接着进行烟风阻力计算和锅炉强度计算。

关键词 ：燃气锅炉   利用率   热平衡

Abstract: Gas-fired boiler is a machinery and equipment which use the calorific value burned by the gas to heat the water and change it into the steam. The boiler contains two parts: the pot and the burner. Compared with the traditional equipment which burned the mineral fuels, such as the coal-fired boiler, the gas-fired boilers not only have a greater calorific value, but also produce less harmful gases, and have a higher utilization.

        The water and the steam generated by the boiler can be directly provided for the need of the production and the living, can be converted to mechanical energy by steam power plant, or generate electrical energy by the generator. Steam boiler is an equipment which can generate steam, water boiler is an equipment which can provide hot water.

        This paper is about 2.8MW shell horizontal gas burning hot water boiler design and calculation. First of all, based on gas components calculation, make a table of the results produced by the temperature of flue gas enthalpy for later use. After heat balance calculation, furnace thermal calculation and calculation of the convection heat transfer, the gas and air resistance calculation and boiler strength calculation is also concerned.

Keywords:   Gas-fired boiler    Boiler efficiency    Heat balance