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一、蒸气工作的压力怎样确定——压力越高越好吗蒸气加热有直接加热和间接加热两种方法,从节能出发,并不要求蒸气工作压力过高,特别是后一种加热方法,蒸气压力越高,效果适得其反。为了说明这一点,下面研究两种加热方法的热能利用情况。 1.蒸气直接加热这种加热过程,不管饱和蒸气或过热蒸气,蒸气总含热量全部被利用了。如某物体要求温度100℃,需要100,000千卡的热量。如使用压力1公斤/厘米~2的饱和蒸气,则需要干饱和蒸气:100,000/646=155公斤(i_饱=646千卡/公斤)。如果使用
First, how to determine the pressure of steam work - the higher the pressure the better? Steam heating direct heating and indirect heating of two methods, starting from the energy does not require steam pressure is too high, especially after a heating method, steam The higher the pressure, the opposite effect. To illustrate this point, the following study investigated the thermal energy utilization of the two heating methods. 1. Steam direct heating This heating process, regardless of saturated steam or superheated steam, the total heat content of steam is fully utilized. If an object requires a temperature of 100 ° C, it requires 100,000 kcal of heat. For saturated steam at a pressure of 1 kg / cm 2, dry saturated steam is required: 100,000 / 646 = 155 kg (i_at = 646 kcal / kg). If used