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间歇式碳化硅元件电炉设计参考数据 | ||||||||||||||||
| 2017-4-28 | ||||||||||||||||
| 1.加热功率(KW)=被加热物质量(KG)×被加热物比热×升温速率(最高炉温℃÷总加热时间h)÷860(860千卡=1KW) 设：单位热损失为740千卡/M2小时 Heating power(KW)=weight of the object to be heated(kg)×specific heat of the object to be heated×temperture-raising speed max furnace temp.(℃)÷[total heating time(hour)×860](860 Kcal=1KW). Suppose:unit heat-loss is 740 kcal/M2hour 2.热损失(KW)=炉膛表面积(M2)×740÷860(860 kcal=1KW) 设：炉墙厚10cm，炉温100℃为一个单位常数，此时炉膛每M2面积上的蓄热为635千卡。 Heat-loss(KW)=surface area of furnace chamber(M2)×740÷860. Suppose:furnace wall thickness 10cm and furnace temperature 100℃ is a unit constant， then the heat accumulation quantity on the furnace chamber is 635 kcal per M2. 3.蓄热功率(KW)={[(炉墙厚度cm÷10cm)×(最高炉温℃÷100℃)]×635}×炉膛表面积M2÷(总加热时间hr×860). Heat accumulation power(KW)={[(furnace wall thickness cm÷10cm)×(max. furnace temperature℃÷100℃)]×635}×furnace chamberarea M2÷(total heating time(hr)×860). 4.所需总功率(KW)，是前三项之和。由于碳化硅电热元件长期在高温下工作，逐渐老化而阻值增大，功率下降。为能及时调整到所需功率，变压器功率应大于所需总功率的20～50%为宜。 The total power needed(KW) is the sum of the above three terms.Owning to the fact that the Songshan silca heating elements work long-term under high temperature，it gradually ages and its resistance value increases，power decreases.In order t adjust it to the power needed in time，the power of transformer should be larger than 30~50% of the total power needed. 5.根据炉子尺寸选择元件的规格。 Select heating elements dimensions according to furnace sizes. 6.确定最高炉温后，根据元件在此炉温下所规定的表面负荷，乘以所选元件发热部的表面积(从产品规格表中查出），求出单支元件的功率(KW)。 After determining the max furnace temperature， calculate the power(KW) of a single element using the way of multiplying the stipulated surface load of the elements under said furnace temperature(find it out from the above table) by the surface area of hot zone of the elements.(Find it out from the product dimension.) 7.所需总功率(KW)÷单支元件功率=应安装元件数量。 Total power(KW) needed ÷ singlle element power=the quantity of elements that should be installed. 8.设计线路图，确定单支元件的最阻。 Design the circuit diagram and determine the resistance of the single element. 9.元件距炉墙及被加热物之间的距离 The distance between the element and the furnace wall and the object to be heated.
10.炉墙上的元件插入孔的直径应为所安装元件直径的1.5倍，间隙处用石棉绳或硅酸稆纤维毡堵塞。 The diameter of the hole for heating element-inserting on the furncae wall should be 1.5 times of that of the element Dia to be installed. The space there is filled with asbestos cord or aluminum silicate fiber felt. 11.两个元件插入孔之间的中心距为元件直径的3～5倍为宜。 The central distance between two heating element-inserting holes should be 3-5 times of the element diameter. 12.为确保元件与导线夹具接触良好，最好在元件端部喷铝处包上2～3层纯铝箔，然后再安装导线夹具。 In order to keep the elements and the lead wire well contacting， better wrap the Al-srayed heating element end with 2 to 3 layers of pure Al leaf. Then mount the lead wire clamp. 13. 为节省能源，建炉用的保温材料，最好选用保温性能好的轻质高铝砖和适量硅酸铝纤维砖。 In order to save energy resources， for the thermal insulation material applied to building furnace，better select well insulated high quality light aluminum bricks and proper quantity of aluminium ailicate fibre felt or bricks. | ||||||||||||||||
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