论文部分内容阅读
此文着重分析了覆铜钢件表面水珠低温辐射烘干的机理。由斯忒藩——玻耳兹曼定律R=ε_ΤσΤ~4的辐射出射度知,射度的大小与ε_Τ、Τ有关,而围系ε_Τ的大小提出了吸收物λ匹配共振、热辐射面形状、涂料在工作温度时ε_Τ与吸收物α_λ的相对接近等问题。鉴于红外辐射的穿透较浅的特性以及温度对ε_Τ、λ的影响作用,笔者提出了温度相对平衡理论,即在炉膛内壁输入气垫状热气流,利用热气流的对流传递,达到炉膛内温度场的均匀,从而保证ε_Τ、λ的值恒定,使匹配稳定,热效率提高。由产品的特性及斯忒藩——玻耳兹曼定律笔者提出:靠提高温度来提高辐射能量是不经济的,显然T的提高依赖于热源能耗的增大,此种情况下,要提高热效率,必须提高产品的利用功率,即增加产品的输入量,相对功率降低,这并未提高热效率。因此,提高辐射烘干炉热效率的关键在于寻求最大可能的辐射面及水的最佳吸收波长温度区,以此作为热源的温度控制点,即此时的温度控制点B是ε_λ=α_λ的基点,不难认为这时的η为最佳点。
This article focuses on the analysis of the surface of copper clad steel parts by low temperature radiation drying mechanism. By the Stefan-Boltzmann law R = ε_TσT ~ 4 radiation emission degree of knowledge, the size of the degree of projection and ε_T, T, and the size of the surrounding ε_T absorbers λ match resonance, heat radiation surface shape , Paint at the working temperature ε_T absorber α_λ relatively close and other issues. In view of the shallow penetration of infrared radiation and the effect of temperature on ε_T and λ, the author puts forward the theory of relative temperature equilibrium, that is, inputting the air cushion-like hot air flow on the inner wall of the furnace, utilizing the convection of the hot air flow to reach the temperature field in the furnace Uniform, so as to ensure ε_T, λ constant value to match the stability, thermal efficiency. According to the characteristics of the product and the Stefan-Boltzmann law, the author proposes that it is uneconomical to raise the radiant energy by increasing the temperature. Obviously, the increase of T depends on the increase of the energy consumption of the heat source. In such a case, Thermal efficiency, the product must increase the use of power, that is, increase the input of the product, the relative power reduction, which did not improve thermal efficiency. Therefore, the key to improve the thermal efficiency of the radiation drying furnace lies in finding the best absorption wavelength temperature zone of the radiation surface and water as the temperature control point of the heat source, that is, the temperature control point B at this time is the base point of ε_λ = α_λ , It is not difficult to think that η is the best point at this time.